#
# Makefile for the Atmel network device drivers.
#
+macb-y := macb_main.o
obj-$(CONFIG_MACB) += macb.o
obj-$(CONFIG_MACB_PCI) += macb_pci.o
+++ /dev/null
-/*
- * Cadence MACB/GEM Ethernet Controller driver
- *
- * Copyright (C) 2004-2006 Atmel Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/clk.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/circ_buf.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/io.h>
-#include <linux/gpio.h>
-#include <linux/gpio/consumer.h>
-#include <linux/interrupt.h>
-#include <linux/netdevice.h>
-#include <linux/etherdevice.h>
-#include <linux/dma-mapping.h>
-#include <linux/platform_data/macb.h>
-#include <linux/platform_device.h>
-#include <linux/phy.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
-#include <linux/of_gpio.h>
-#include <linux/of_mdio.h>
-#include <linux/of_net.h>
-#include <linux/ip.h>
-#include <linux/udp.h>
-#include <linux/tcp.h>
-#include "macb.h"
-
-#define MACB_RX_BUFFER_SIZE 128
-#define RX_BUFFER_MULTIPLE 64 /* bytes */
-
-#define DEFAULT_RX_RING_SIZE 512 /* must be power of 2 */
-#define MIN_RX_RING_SIZE 64
-#define MAX_RX_RING_SIZE 8192
-#define RX_RING_BYTES(bp) (macb_dma_desc_get_size(bp) \
- * (bp)->rx_ring_size)
-
-#define DEFAULT_TX_RING_SIZE 512 /* must be power of 2 */
-#define MIN_TX_RING_SIZE 64
-#define MAX_TX_RING_SIZE 4096
-#define TX_RING_BYTES(bp) (macb_dma_desc_get_size(bp) \
- * (bp)->tx_ring_size)
-
-/* level of occupied TX descriptors under which we wake up TX process */
-#define MACB_TX_WAKEUP_THRESH(bp) (3 * (bp)->tx_ring_size / 4)
-
-#define MACB_RX_INT_FLAGS (MACB_BIT(RCOMP) | MACB_BIT(RXUBR) \
- | MACB_BIT(ISR_ROVR))
-#define MACB_TX_ERR_FLAGS (MACB_BIT(ISR_TUND) \
- | MACB_BIT(ISR_RLE) \
- | MACB_BIT(TXERR))
-#define MACB_TX_INT_FLAGS (MACB_TX_ERR_FLAGS | MACB_BIT(TCOMP))
-
-/* Max length of transmit frame must be a multiple of 8 bytes */
-#define MACB_TX_LEN_ALIGN 8
-#define MACB_MAX_TX_LEN ((unsigned int)((1 << MACB_TX_FRMLEN_SIZE) - 1) & ~((unsigned int)(MACB_TX_LEN_ALIGN - 1)))
-#define GEM_MAX_TX_LEN ((unsigned int)((1 << GEM_TX_FRMLEN_SIZE) - 1) & ~((unsigned int)(MACB_TX_LEN_ALIGN - 1)))
-
-#define GEM_MTU_MIN_SIZE ETH_MIN_MTU
-#define MACB_NETIF_LSO (NETIF_F_TSO | NETIF_F_UFO)
-
-#define MACB_WOL_HAS_MAGIC_PACKET (0x1 << 0)
-#define MACB_WOL_ENABLED (0x1 << 1)
-
-/* Graceful stop timeouts in us. We should allow up to
- * 1 frame time (10 Mbits/s, full-duplex, ignoring collisions)
- */
-#define MACB_HALT_TIMEOUT 1230
-
-/* DMA buffer descriptor might be different size
- * depends on hardware configuration:
- *
- * 1. dma address width 32 bits:
- * word 1: 32 bit address of Data Buffer
- * word 2: control
- *
- * 2. dma address width 64 bits:
- * word 1: 32 bit address of Data Buffer
- * word 2: control
- * word 3: upper 32 bit address of Data Buffer
- * word 4: unused
- *
- * 3. dma address width 32 bits with hardware timestamping:
- * word 1: 32 bit address of Data Buffer
- * word 2: control
- * word 3: timestamp word 1
- * word 4: timestamp word 2
- *
- * 4. dma address width 64 bits with hardware timestamping:
- * word 1: 32 bit address of Data Buffer
- * word 2: control
- * word 3: upper 32 bit address of Data Buffer
- * word 4: unused
- * word 5: timestamp word 1
- * word 6: timestamp word 2
- */
-static unsigned int macb_dma_desc_get_size(struct macb *bp)
-{
-#ifdef MACB_EXT_DESC
- unsigned int desc_size;
-
- switch (bp->hw_dma_cap) {
- case HW_DMA_CAP_64B:
- desc_size = sizeof(struct macb_dma_desc)
- + sizeof(struct macb_dma_desc_64);
- break;
- case HW_DMA_CAP_PTP:
- desc_size = sizeof(struct macb_dma_desc)
- + sizeof(struct macb_dma_desc_ptp);
- break;
- case HW_DMA_CAP_64B_PTP:
- desc_size = sizeof(struct macb_dma_desc)
- + sizeof(struct macb_dma_desc_64)
- + sizeof(struct macb_dma_desc_ptp);
- break;
- default:
- desc_size = sizeof(struct macb_dma_desc);
- }
- return desc_size;
-#endif
- return sizeof(struct macb_dma_desc);
-}
-
-static unsigned int macb_adj_dma_desc_idx(struct macb *bp, unsigned int desc_idx)
-{
-#ifdef MACB_EXT_DESC
- switch (bp->hw_dma_cap) {
- case HW_DMA_CAP_64B:
- case HW_DMA_CAP_PTP:
- desc_idx <<= 1;
- break;
- case HW_DMA_CAP_64B_PTP:
- desc_idx *= 3;
- break;
- default:
- break;
- }
- return desc_idx;
-#endif
- return desc_idx;
-}
-
-#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
-static struct macb_dma_desc_64 *macb_64b_desc(struct macb *bp, struct macb_dma_desc *desc)
-{
- if (bp->hw_dma_cap & HW_DMA_CAP_64B)
- return (struct macb_dma_desc_64 *)((void *)desc + sizeof(struct macb_dma_desc));
- return NULL;
-}
-#endif
-
-/* Ring buffer accessors */
-static unsigned int macb_tx_ring_wrap(struct macb *bp, unsigned int index)
-{
- return index & (bp->tx_ring_size - 1);
-}
-
-static struct macb_dma_desc *macb_tx_desc(struct macb_queue *queue,
- unsigned int index)
-{
- index = macb_tx_ring_wrap(queue->bp, index);
- index = macb_adj_dma_desc_idx(queue->bp, index);
- return &queue->tx_ring[index];
-}
-
-static struct macb_tx_skb *macb_tx_skb(struct macb_queue *queue,
- unsigned int index)
-{
- return &queue->tx_skb[macb_tx_ring_wrap(queue->bp, index)];
-}
-
-static dma_addr_t macb_tx_dma(struct macb_queue *queue, unsigned int index)
-{
- dma_addr_t offset;
-
- offset = macb_tx_ring_wrap(queue->bp, index) *
- macb_dma_desc_get_size(queue->bp);
-
- return queue->tx_ring_dma + offset;
-}
-
-static unsigned int macb_rx_ring_wrap(struct macb *bp, unsigned int index)
-{
- return index & (bp->rx_ring_size - 1);
-}
-
-static struct macb_dma_desc *macb_rx_desc(struct macb *bp, unsigned int index)
-{
- index = macb_rx_ring_wrap(bp, index);
- index = macb_adj_dma_desc_idx(bp, index);
- return &bp->rx_ring[index];
-}
-
-static void *macb_rx_buffer(struct macb *bp, unsigned int index)
-{
- return bp->rx_buffers + bp->rx_buffer_size *
- macb_rx_ring_wrap(bp, index);
-}
-
-/* I/O accessors */
-static u32 hw_readl_native(struct macb *bp, int offset)
-{
- return __raw_readl(bp->regs + offset);
-}
-
-static void hw_writel_native(struct macb *bp, int offset, u32 value)
-{
- __raw_writel(value, bp->regs + offset);
-}
-
-static u32 hw_readl(struct macb *bp, int offset)
-{
- return readl_relaxed(bp->regs + offset);
-}
-
-static void hw_writel(struct macb *bp, int offset, u32 value)
-{
- writel_relaxed(value, bp->regs + offset);
-}
-
-/* Find the CPU endianness by using the loopback bit of NCR register. When the
- * CPU is in big endian we need to program swapped mode for management
- * descriptor access.
- */
-static bool hw_is_native_io(void __iomem *addr)
-{
- u32 value = MACB_BIT(LLB);
-
- __raw_writel(value, addr + MACB_NCR);
- value = __raw_readl(addr + MACB_NCR);
-
- /* Write 0 back to disable everything */
- __raw_writel(0, addr + MACB_NCR);
-
- return value == MACB_BIT(LLB);
-}
-
-static bool hw_is_gem(void __iomem *addr, bool native_io)
-{
- u32 id;
-
- if (native_io)
- id = __raw_readl(addr + MACB_MID);
- else
- id = readl_relaxed(addr + MACB_MID);
-
- return MACB_BFEXT(IDNUM, id) >= 0x2;
-}
-
-static void macb_set_hwaddr(struct macb *bp)
-{
- u32 bottom;
- u16 top;
-
- bottom = cpu_to_le32(*((u32 *)bp->dev->dev_addr));
- macb_or_gem_writel(bp, SA1B, bottom);
- top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4)));
- macb_or_gem_writel(bp, SA1T, top);
-
- /* Clear unused address register sets */
- macb_or_gem_writel(bp, SA2B, 0);
- macb_or_gem_writel(bp, SA2T, 0);
- macb_or_gem_writel(bp, SA3B, 0);
- macb_or_gem_writel(bp, SA3T, 0);
- macb_or_gem_writel(bp, SA4B, 0);
- macb_or_gem_writel(bp, SA4T, 0);
-}
-
-static void macb_get_hwaddr(struct macb *bp)
-{
- struct macb_platform_data *pdata;
- u32 bottom;
- u16 top;
- u8 addr[6];
- int i;
-
- pdata = dev_get_platdata(&bp->pdev->dev);
-
- /* Check all 4 address register for valid address */
- for (i = 0; i < 4; i++) {
- bottom = macb_or_gem_readl(bp, SA1B + i * 8);
- top = macb_or_gem_readl(bp, SA1T + i * 8);
-
- if (pdata && pdata->rev_eth_addr) {
- addr[5] = bottom & 0xff;
- addr[4] = (bottom >> 8) & 0xff;
- addr[3] = (bottom >> 16) & 0xff;
- addr[2] = (bottom >> 24) & 0xff;
- addr[1] = top & 0xff;
- addr[0] = (top & 0xff00) >> 8;
- } else {
- addr[0] = bottom & 0xff;
- addr[1] = (bottom >> 8) & 0xff;
- addr[2] = (bottom >> 16) & 0xff;
- addr[3] = (bottom >> 24) & 0xff;
- addr[4] = top & 0xff;
- addr[5] = (top >> 8) & 0xff;
- }
-
- if (is_valid_ether_addr(addr)) {
- memcpy(bp->dev->dev_addr, addr, sizeof(addr));
- return;
- }
- }
-
- dev_info(&bp->pdev->dev, "invalid hw address, using random\n");
- eth_hw_addr_random(bp->dev);
-}
-
-static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
-{
- struct macb *bp = bus->priv;
- int value;
-
- macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
- | MACB_BF(RW, MACB_MAN_READ)
- | MACB_BF(PHYA, mii_id)
- | MACB_BF(REGA, regnum)
- | MACB_BF(CODE, MACB_MAN_CODE)));
-
- /* wait for end of transfer */
- while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
- cpu_relax();
-
- value = MACB_BFEXT(DATA, macb_readl(bp, MAN));
-
- return value;
-}
-
-static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
- u16 value)
-{
- struct macb *bp = bus->priv;
-
- macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
- | MACB_BF(RW, MACB_MAN_WRITE)
- | MACB_BF(PHYA, mii_id)
- | MACB_BF(REGA, regnum)
- | MACB_BF(CODE, MACB_MAN_CODE)
- | MACB_BF(DATA, value)));
-
- /* wait for end of transfer */
- while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
- cpu_relax();
-
- return 0;
-}
-
-/**
- * macb_set_tx_clk() - Set a clock to a new frequency
- * @clk Pointer to the clock to change
- * @rate New frequency in Hz
- * @dev Pointer to the struct net_device
- */
-static void macb_set_tx_clk(struct clk *clk, int speed, struct net_device *dev)
-{
- long ferr, rate, rate_rounded;
-
- if (!clk)
- return;
-
- switch (speed) {
- case SPEED_10:
- rate = 2500000;
- break;
- case SPEED_100:
- rate = 25000000;
- break;
- case SPEED_1000:
- rate = 125000000;
- break;
- default:
- return;
- }
-
- rate_rounded = clk_round_rate(clk, rate);
- if (rate_rounded < 0)
- return;
-
- /* RGMII allows 50 ppm frequency error. Test and warn if this limit
- * is not satisfied.
- */
- ferr = abs(rate_rounded - rate);
- ferr = DIV_ROUND_UP(ferr, rate / 100000);
- if (ferr > 5)
- netdev_warn(dev, "unable to generate target frequency: %ld Hz\n",
- rate);
-
- if (clk_set_rate(clk, rate_rounded))
- netdev_err(dev, "adjusting tx_clk failed.\n");
-}
-
-static void macb_handle_link_change(struct net_device *dev)
-{
- struct macb *bp = netdev_priv(dev);
- struct phy_device *phydev = dev->phydev;
- unsigned long flags;
- int status_change = 0;
-
- spin_lock_irqsave(&bp->lock, flags);
-
- if (phydev->link) {
- if ((bp->speed != phydev->speed) ||
- (bp->duplex != phydev->duplex)) {
- u32 reg;
-
- reg = macb_readl(bp, NCFGR);
- reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
- if (macb_is_gem(bp))
- reg &= ~GEM_BIT(GBE);
-
- if (phydev->duplex)
- reg |= MACB_BIT(FD);
- if (phydev->speed == SPEED_100)
- reg |= MACB_BIT(SPD);
- if (phydev->speed == SPEED_1000 &&
- bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE)
- reg |= GEM_BIT(GBE);
-
- macb_or_gem_writel(bp, NCFGR, reg);
-
- bp->speed = phydev->speed;
- bp->duplex = phydev->duplex;
- status_change = 1;
- }
- }
-
- if (phydev->link != bp->link) {
- if (!phydev->link) {
- bp->speed = 0;
- bp->duplex = -1;
- }
- bp->link = phydev->link;
-
- status_change = 1;
- }
-
- spin_unlock_irqrestore(&bp->lock, flags);
-
- if (status_change) {
- if (phydev->link) {
- /* Update the TX clock rate if and only if the link is
- * up and there has been a link change.
- */
- macb_set_tx_clk(bp->tx_clk, phydev->speed, dev);
-
- netif_carrier_on(dev);
- netdev_info(dev, "link up (%d/%s)\n",
- phydev->speed,
- phydev->duplex == DUPLEX_FULL ?
- "Full" : "Half");
- } else {
- netif_carrier_off(dev);
- netdev_info(dev, "link down\n");
- }
- }
-}
-
-/* based on au1000_eth. c*/
-static int macb_mii_probe(struct net_device *dev)
-{
- struct macb *bp = netdev_priv(dev);
- struct macb_platform_data *pdata;
- struct phy_device *phydev;
- int phy_irq;
- int ret;
-
- if (bp->phy_node) {
- phydev = of_phy_connect(dev, bp->phy_node,
- &macb_handle_link_change, 0,
- bp->phy_interface);
- if (!phydev)
- return -ENODEV;
- } else {
- phydev = phy_find_first(bp->mii_bus);
- if (!phydev) {
- netdev_err(dev, "no PHY found\n");
- return -ENXIO;
- }
-
- pdata = dev_get_platdata(&bp->pdev->dev);
- if (pdata) {
- if (gpio_is_valid(pdata->phy_irq_pin)) {
- ret = devm_gpio_request(&bp->pdev->dev,
- pdata->phy_irq_pin, "phy int");
- if (!ret) {
- phy_irq = gpio_to_irq(pdata->phy_irq_pin);
- phydev->irq = (phy_irq < 0) ? PHY_POLL : phy_irq;
- }
- } else {
- phydev->irq = PHY_POLL;
- }
- }
-
- /* attach the mac to the phy */
- ret = phy_connect_direct(dev, phydev, &macb_handle_link_change,
- bp->phy_interface);
- if (ret) {
- netdev_err(dev, "Could not attach to PHY\n");
- return ret;
- }
- }
-
- /* mask with MAC supported features */
- if (macb_is_gem(bp) && bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE)
- phydev->supported &= PHY_GBIT_FEATURES;
- else
- phydev->supported &= PHY_BASIC_FEATURES;
-
- if (bp->caps & MACB_CAPS_NO_GIGABIT_HALF)
- phydev->supported &= ~SUPPORTED_1000baseT_Half;
-
- phydev->advertising = phydev->supported;
-
- bp->link = 0;
- bp->speed = 0;
- bp->duplex = -1;
-
- return 0;
-}
-
-static int macb_mii_init(struct macb *bp)
-{
- struct macb_platform_data *pdata;
- struct device_node *np;
- int err = -ENXIO, i;
-
- /* Enable management port */
- macb_writel(bp, NCR, MACB_BIT(MPE));
-
- bp->mii_bus = mdiobus_alloc();
- if (!bp->mii_bus) {
- err = -ENOMEM;
- goto err_out;
- }
-
- bp->mii_bus->name = "MACB_mii_bus";
- bp->mii_bus->read = &macb_mdio_read;
- bp->mii_bus->write = &macb_mdio_write;
- snprintf(bp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
- bp->pdev->name, bp->pdev->id);
- bp->mii_bus->priv = bp;
- bp->mii_bus->parent = &bp->pdev->dev;
- pdata = dev_get_platdata(&bp->pdev->dev);
-
- dev_set_drvdata(&bp->dev->dev, bp->mii_bus);
-
- np = bp->pdev->dev.of_node;
- if (np) {
- if (of_phy_is_fixed_link(np)) {
- if (of_phy_register_fixed_link(np) < 0) {
- dev_err(&bp->pdev->dev,
- "broken fixed-link specification\n");
- goto err_out_unregister_bus;
- }
- bp->phy_node = of_node_get(np);
-
- err = mdiobus_register(bp->mii_bus);
- } else {
- /* try dt phy registration */
- err = of_mdiobus_register(bp->mii_bus, np);
-
- /* fallback to standard phy registration if no phy were
- * found during dt phy registration
- */
- if (!err && !phy_find_first(bp->mii_bus)) {
- for (i = 0; i < PHY_MAX_ADDR; i++) {
- struct phy_device *phydev;
-
- phydev = mdiobus_scan(bp->mii_bus, i);
- if (IS_ERR(phydev) &&
- PTR_ERR(phydev) != -ENODEV) {
- err = PTR_ERR(phydev);
- break;
- }
- }
-
- if (err)
- goto err_out_unregister_bus;
- }
- }
- } else {
- for (i = 0; i < PHY_MAX_ADDR; i++)
- bp->mii_bus->irq[i] = PHY_POLL;
-
- if (pdata)
- bp->mii_bus->phy_mask = pdata->phy_mask;
-
- err = mdiobus_register(bp->mii_bus);
- }
-
- if (err)
- goto err_out_free_mdiobus;
-
- err = macb_mii_probe(bp->dev);
- if (err)
- goto err_out_unregister_bus;
-
- return 0;
-
-err_out_unregister_bus:
- mdiobus_unregister(bp->mii_bus);
-err_out_free_mdiobus:
- mdiobus_free(bp->mii_bus);
-err_out:
- return err;
-}
-
-static void macb_update_stats(struct macb *bp)
-{
- u32 *p = &bp->hw_stats.macb.rx_pause_frames;
- u32 *end = &bp->hw_stats.macb.tx_pause_frames + 1;
- int offset = MACB_PFR;
-
- WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4);
-
- for (; p < end; p++, offset += 4)
- *p += bp->macb_reg_readl(bp, offset);
-}
-
-static int macb_halt_tx(struct macb *bp)
-{
- unsigned long halt_time, timeout;
- u32 status;
-
- macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(THALT));
-
- timeout = jiffies + usecs_to_jiffies(MACB_HALT_TIMEOUT);
- do {
- halt_time = jiffies;
- status = macb_readl(bp, TSR);
- if (!(status & MACB_BIT(TGO)))
- return 0;
-
- usleep_range(10, 250);
- } while (time_before(halt_time, timeout));
-
- return -ETIMEDOUT;
-}
-
-static void macb_tx_unmap(struct macb *bp, struct macb_tx_skb *tx_skb)
-{
- if (tx_skb->mapping) {
- if (tx_skb->mapped_as_page)
- dma_unmap_page(&bp->pdev->dev, tx_skb->mapping,
- tx_skb->size, DMA_TO_DEVICE);
- else
- dma_unmap_single(&bp->pdev->dev, tx_skb->mapping,
- tx_skb->size, DMA_TO_DEVICE);
- tx_skb->mapping = 0;
- }
-
- if (tx_skb->skb) {
- dev_kfree_skb_any(tx_skb->skb);
- tx_skb->skb = NULL;
- }
-}
-
-static void macb_set_addr(struct macb *bp, struct macb_dma_desc *desc, dma_addr_t addr)
-{
-#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
- struct macb_dma_desc_64 *desc_64;
-
- if (bp->hw_dma_cap & HW_DMA_CAP_64B) {
- desc_64 = macb_64b_desc(bp, desc);
- desc_64->addrh = upper_32_bits(addr);
- }
-#endif
- desc->addr = lower_32_bits(addr);
-}
-
-static dma_addr_t macb_get_addr(struct macb *bp, struct macb_dma_desc *desc)
-{
- dma_addr_t addr = 0;
-#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
- struct macb_dma_desc_64 *desc_64;
-
- if (bp->hw_dma_cap & HW_DMA_CAP_64B) {
- desc_64 = macb_64b_desc(bp, desc);
- addr = ((u64)(desc_64->addrh) << 32);
- }
-#endif
- addr |= MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, desc->addr));
- return addr;
-}
-
-static void macb_tx_error_task(struct work_struct *work)
-{
- struct macb_queue *queue = container_of(work, struct macb_queue,
- tx_error_task);
- struct macb *bp = queue->bp;
- struct macb_tx_skb *tx_skb;
- struct macb_dma_desc *desc;
- struct sk_buff *skb;
- unsigned int tail;
- unsigned long flags;
-
- netdev_vdbg(bp->dev, "macb_tx_error_task: q = %u, t = %u, h = %u\n",
- (unsigned int)(queue - bp->queues),
- queue->tx_tail, queue->tx_head);
-
- /* Prevent the queue IRQ handlers from running: each of them may call
- * macb_tx_interrupt(), which in turn may call netif_wake_subqueue().
- * As explained below, we have to halt the transmission before updating
- * TBQP registers so we call netif_tx_stop_all_queues() to notify the
- * network engine about the macb/gem being halted.
- */
- spin_lock_irqsave(&bp->lock, flags);
-
- /* Make sure nobody is trying to queue up new packets */
- netif_tx_stop_all_queues(bp->dev);
-
- /* Stop transmission now
- * (in case we have just queued new packets)
- * macb/gem must be halted to write TBQP register
- */
- if (macb_halt_tx(bp))
- /* Just complain for now, reinitializing TX path can be good */
- netdev_err(bp->dev, "BUG: halt tx timed out\n");
-
- /* Treat frames in TX queue including the ones that caused the error.
- * Free transmit buffers in upper layer.
- */
- for (tail = queue->tx_tail; tail != queue->tx_head; tail++) {
- u32 ctrl;
-
- desc = macb_tx_desc(queue, tail);
- ctrl = desc->ctrl;
- tx_skb = macb_tx_skb(queue, tail);
- skb = tx_skb->skb;
-
- if (ctrl & MACB_BIT(TX_USED)) {
- /* skb is set for the last buffer of the frame */
- while (!skb) {
- macb_tx_unmap(bp, tx_skb);
- tail++;
- tx_skb = macb_tx_skb(queue, tail);
- skb = tx_skb->skb;
- }
-
- /* ctrl still refers to the first buffer descriptor
- * since it's the only one written back by the hardware
- */
- if (!(ctrl & MACB_BIT(TX_BUF_EXHAUSTED))) {
- netdev_vdbg(bp->dev, "txerr skb %u (data %p) TX complete\n",
- macb_tx_ring_wrap(bp, tail),
- skb->data);
- bp->dev->stats.tx_packets++;
- bp->dev->stats.tx_bytes += skb->len;
- }
- } else {
- /* "Buffers exhausted mid-frame" errors may only happen
- * if the driver is buggy, so complain loudly about
- * those. Statistics are updated by hardware.
- */
- if (ctrl & MACB_BIT(TX_BUF_EXHAUSTED))
- netdev_err(bp->dev,
- "BUG: TX buffers exhausted mid-frame\n");
-
- desc->ctrl = ctrl | MACB_BIT(TX_USED);
- }
-
- macb_tx_unmap(bp, tx_skb);
- }
-
- /* Set end of TX queue */
- desc = macb_tx_desc(queue, 0);
- macb_set_addr(bp, desc, 0);
- desc->ctrl = MACB_BIT(TX_USED);
-
- /* Make descriptor updates visible to hardware */
- wmb();
-
- /* Reinitialize the TX desc queue */
- queue_writel(queue, TBQP, lower_32_bits(queue->tx_ring_dma));
-#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
- if (bp->hw_dma_cap & HW_DMA_CAP_64B)
- queue_writel(queue, TBQPH, upper_32_bits(queue->tx_ring_dma));
-#endif
- /* Make TX ring reflect state of hardware */
- queue->tx_head = 0;
- queue->tx_tail = 0;
-
- /* Housework before enabling TX IRQ */
- macb_writel(bp, TSR, macb_readl(bp, TSR));
- queue_writel(queue, IER, MACB_TX_INT_FLAGS);
-
- /* Now we are ready to start transmission again */
- netif_tx_start_all_queues(bp->dev);
- macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
-
- spin_unlock_irqrestore(&bp->lock, flags);
-}
-
-static void macb_tx_interrupt(struct macb_queue *queue)
-{
- unsigned int tail;
- unsigned int head;
- u32 status;
- struct macb *bp = queue->bp;
- u16 queue_index = queue - bp->queues;
-
- status = macb_readl(bp, TSR);
- macb_writel(bp, TSR, status);
-
- if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
- queue_writel(queue, ISR, MACB_BIT(TCOMP));
-
- netdev_vdbg(bp->dev, "macb_tx_interrupt status = 0x%03lx\n",
- (unsigned long)status);
-
- head = queue->tx_head;
- for (tail = queue->tx_tail; tail != head; tail++) {
- struct macb_tx_skb *tx_skb;
- struct sk_buff *skb;
- struct macb_dma_desc *desc;
- u32 ctrl;
-
- desc = macb_tx_desc(queue, tail);
-
- /* Make hw descriptor updates visible to CPU */
- rmb();
-
- ctrl = desc->ctrl;
-
- /* TX_USED bit is only set by hardware on the very first buffer
- * descriptor of the transmitted frame.
- */
- if (!(ctrl & MACB_BIT(TX_USED)))
- break;
-
- /* Process all buffers of the current transmitted frame */
- for (;; tail++) {
- tx_skb = macb_tx_skb(queue, tail);
- skb = tx_skb->skb;
-
- /* First, update TX stats if needed */
- if (skb) {
- netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n",
- macb_tx_ring_wrap(bp, tail),
- skb->data);
- bp->dev->stats.tx_packets++;
- bp->dev->stats.tx_bytes += skb->len;
- }
-
- /* Now we can safely release resources */
- macb_tx_unmap(bp, tx_skb);
-
- /* skb is set only for the last buffer of the frame.
- * WARNING: at this point skb has been freed by
- * macb_tx_unmap().
- */
- if (skb)
- break;
- }
- }
-
- queue->tx_tail = tail;
- if (__netif_subqueue_stopped(bp->dev, queue_index) &&
- CIRC_CNT(queue->tx_head, queue->tx_tail,
- bp->tx_ring_size) <= MACB_TX_WAKEUP_THRESH(bp))
- netif_wake_subqueue(bp->dev, queue_index);
-}
-
-static void gem_rx_refill(struct macb *bp)
-{
- unsigned int entry;
- struct sk_buff *skb;
- dma_addr_t paddr;
- struct macb_dma_desc *desc;
-
- while (CIRC_SPACE(bp->rx_prepared_head, bp->rx_tail,
- bp->rx_ring_size) > 0) {
- entry = macb_rx_ring_wrap(bp, bp->rx_prepared_head);
-
- /* Make hw descriptor updates visible to CPU */
- rmb();
-
- bp->rx_prepared_head++;
- desc = macb_rx_desc(bp, entry);
-
- if (!bp->rx_skbuff[entry]) {
- /* allocate sk_buff for this free entry in ring */
- skb = netdev_alloc_skb(bp->dev, bp->rx_buffer_size);
- if (unlikely(!skb)) {
- netdev_err(bp->dev,
- "Unable to allocate sk_buff\n");
- break;
- }
-
- /* now fill corresponding descriptor entry */
- paddr = dma_map_single(&bp->pdev->dev, skb->data,
- bp->rx_buffer_size,
- DMA_FROM_DEVICE);
- if (dma_mapping_error(&bp->pdev->dev, paddr)) {
- dev_kfree_skb(skb);
- break;
- }
-
- bp->rx_skbuff[entry] = skb;
-
- if (entry == bp->rx_ring_size - 1)
- paddr |= MACB_BIT(RX_WRAP);
- macb_set_addr(bp, desc, paddr);
- desc->ctrl = 0;
-
- /* properly align Ethernet header */
- skb_reserve(skb, NET_IP_ALIGN);
- } else {
- desc->addr &= ~MACB_BIT(RX_USED);
- desc->ctrl = 0;
- }
- }
-
- /* Make descriptor updates visible to hardware */
- wmb();
-
- netdev_vdbg(bp->dev, "rx ring: prepared head %d, tail %d\n",
- bp->rx_prepared_head, bp->rx_tail);
-}
-
-/* Mark DMA descriptors from begin up to and not including end as unused */
-static void discard_partial_frame(struct macb *bp, unsigned int begin,
- unsigned int end)
-{
- unsigned int frag;
-
- for (frag = begin; frag != end; frag++) {
- struct macb_dma_desc *desc = macb_rx_desc(bp, frag);
-
- desc->addr &= ~MACB_BIT(RX_USED);
- }
-
- /* Make descriptor updates visible to hardware */
- wmb();
-
- /* When this happens, the hardware stats registers for
- * whatever caused this is updated, so we don't have to record
- * anything.
- */
-}
-
-static int gem_rx(struct macb *bp, int budget)
-{
- unsigned int len;
- unsigned int entry;
- struct sk_buff *skb;
- struct macb_dma_desc *desc;
- int count = 0;
-
- while (count < budget) {
- u32 ctrl;
- dma_addr_t addr;
- bool rxused;
-
- entry = macb_rx_ring_wrap(bp, bp->rx_tail);
- desc = macb_rx_desc(bp, entry);
-
- /* Make hw descriptor updates visible to CPU */
- rmb();
-
- rxused = (desc->addr & MACB_BIT(RX_USED)) ? true : false;
- addr = macb_get_addr(bp, desc);
- ctrl = desc->ctrl;
-
- if (!rxused)
- break;
-
- bp->rx_tail++;
- count++;
-
- if (!(ctrl & MACB_BIT(RX_SOF) && ctrl & MACB_BIT(RX_EOF))) {
- netdev_err(bp->dev,
- "not whole frame pointed by descriptor\n");
- bp->dev->stats.rx_dropped++;
- break;
- }
- skb = bp->rx_skbuff[entry];
- if (unlikely(!skb)) {
- netdev_err(bp->dev,
- "inconsistent Rx descriptor chain\n");
- bp->dev->stats.rx_dropped++;
- break;
- }
- /* now everything is ready for receiving packet */
- bp->rx_skbuff[entry] = NULL;
- len = ctrl & bp->rx_frm_len_mask;
-
- netdev_vdbg(bp->dev, "gem_rx %u (len %u)\n", entry, len);
-
- skb_put(skb, len);
- dma_unmap_single(&bp->pdev->dev, addr,
- bp->rx_buffer_size, DMA_FROM_DEVICE);
-
- skb->protocol = eth_type_trans(skb, bp->dev);
- skb_checksum_none_assert(skb);
- if (bp->dev->features & NETIF_F_RXCSUM &&
- !(bp->dev->flags & IFF_PROMISC) &&
- GEM_BFEXT(RX_CSUM, ctrl) & GEM_RX_CSUM_CHECKED_MASK)
- skb->ip_summed = CHECKSUM_UNNECESSARY;
-
- bp->dev->stats.rx_packets++;
- bp->dev->stats.rx_bytes += skb->len;
-
-#if defined(DEBUG) && defined(VERBOSE_DEBUG)
- netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
- skb->len, skb->csum);
- print_hex_dump(KERN_DEBUG, " mac: ", DUMP_PREFIX_ADDRESS, 16, 1,
- skb_mac_header(skb), 16, true);
- print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_ADDRESS, 16, 1,
- skb->data, 32, true);
-#endif
-
- netif_receive_skb(skb);
- }
-
- gem_rx_refill(bp);
-
- return count;
-}
-
-static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
- unsigned int last_frag)
-{
- unsigned int len;
- unsigned int frag;
- unsigned int offset;
- struct sk_buff *skb;
- struct macb_dma_desc *desc;
-
- desc = macb_rx_desc(bp, last_frag);
- len = desc->ctrl & bp->rx_frm_len_mask;
-
- netdev_vdbg(bp->dev, "macb_rx_frame frags %u - %u (len %u)\n",
- macb_rx_ring_wrap(bp, first_frag),
- macb_rx_ring_wrap(bp, last_frag), len);
-
- /* The ethernet header starts NET_IP_ALIGN bytes into the
- * first buffer. Since the header is 14 bytes, this makes the
- * payload word-aligned.
- *
- * Instead of calling skb_reserve(NET_IP_ALIGN), we just copy
- * the two padding bytes into the skb so that we avoid hitting
- * the slowpath in memcpy(), and pull them off afterwards.
- */
- skb = netdev_alloc_skb(bp->dev, len + NET_IP_ALIGN);
- if (!skb) {
- bp->dev->stats.rx_dropped++;
- for (frag = first_frag; ; frag++) {
- desc = macb_rx_desc(bp, frag);
- desc->addr &= ~MACB_BIT(RX_USED);
- if (frag == last_frag)
- break;
- }
-
- /* Make descriptor updates visible to hardware */
- wmb();
-
- return 1;
- }
-
- offset = 0;
- len += NET_IP_ALIGN;
- skb_checksum_none_assert(skb);
- skb_put(skb, len);
-
- for (frag = first_frag; ; frag++) {
- unsigned int frag_len = bp->rx_buffer_size;
-
- if (offset + frag_len > len) {
- if (unlikely(frag != last_frag)) {
- dev_kfree_skb_any(skb);
- return -1;
- }
- frag_len = len - offset;
- }
- skb_copy_to_linear_data_offset(skb, offset,
- macb_rx_buffer(bp, frag),
- frag_len);
- offset += bp->rx_buffer_size;
- desc = macb_rx_desc(bp, frag);
- desc->addr &= ~MACB_BIT(RX_USED);
-
- if (frag == last_frag)
- break;
- }
-
- /* Make descriptor updates visible to hardware */
- wmb();
-
- __skb_pull(skb, NET_IP_ALIGN);
- skb->protocol = eth_type_trans(skb, bp->dev);
-
- bp->dev->stats.rx_packets++;
- bp->dev->stats.rx_bytes += skb->len;
- netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
- skb->len, skb->csum);
- netif_receive_skb(skb);
-
- return 0;
-}
-
-static inline void macb_init_rx_ring(struct macb *bp)
-{
- dma_addr_t addr;
- struct macb_dma_desc *desc = NULL;
- int i;
-
- addr = bp->rx_buffers_dma;
- for (i = 0; i < bp->rx_ring_size; i++) {
- desc = macb_rx_desc(bp, i);
- macb_set_addr(bp, desc, addr);
- desc->ctrl = 0;
- addr += bp->rx_buffer_size;
- }
- desc->addr |= MACB_BIT(RX_WRAP);
- bp->rx_tail = 0;
-}
-
-static int macb_rx(struct macb *bp, int budget)
-{
- bool reset_rx_queue = false;
- int received = 0;
- unsigned int tail;
- int first_frag = -1;
-
- for (tail = bp->rx_tail; budget > 0; tail++) {
- struct macb_dma_desc *desc = macb_rx_desc(bp, tail);
- u32 ctrl;
-
- /* Make hw descriptor updates visible to CPU */
- rmb();
-
- ctrl = desc->ctrl;
-
- if (!(desc->addr & MACB_BIT(RX_USED)))
- break;
-
- if (ctrl & MACB_BIT(RX_SOF)) {
- if (first_frag != -1)
- discard_partial_frame(bp, first_frag, tail);
- first_frag = tail;
- }
-
- if (ctrl & MACB_BIT(RX_EOF)) {
- int dropped;
-
- if (unlikely(first_frag == -1)) {
- reset_rx_queue = true;
- continue;
- }
-
- dropped = macb_rx_frame(bp, first_frag, tail);
- first_frag = -1;
- if (unlikely(dropped < 0)) {
- reset_rx_queue = true;
- continue;
- }
- if (!dropped) {
- received++;
- budget--;
- }
- }
- }
-
- if (unlikely(reset_rx_queue)) {
- unsigned long flags;
- u32 ctrl;
-
- netdev_err(bp->dev, "RX queue corruption: reset it\n");
-
- spin_lock_irqsave(&bp->lock, flags);
-
- ctrl = macb_readl(bp, NCR);
- macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE));
-
- macb_init_rx_ring(bp);
- macb_writel(bp, RBQP, bp->rx_ring_dma);
-
- macb_writel(bp, NCR, ctrl | MACB_BIT(RE));
-
- spin_unlock_irqrestore(&bp->lock, flags);
- return received;
- }
-
- if (first_frag != -1)
- bp->rx_tail = first_frag;
- else
- bp->rx_tail = tail;
-
- return received;
-}
-
-static int macb_poll(struct napi_struct *napi, int budget)
-{
- struct macb *bp = container_of(napi, struct macb, napi);
- int work_done;
- u32 status;
-
- status = macb_readl(bp, RSR);
- macb_writel(bp, RSR, status);
-
- work_done = 0;
-
- netdev_vdbg(bp->dev, "poll: status = %08lx, budget = %d\n",
- (unsigned long)status, budget);
-
- work_done = bp->macbgem_ops.mog_rx(bp, budget);
- if (work_done < budget) {
- napi_complete_done(napi, work_done);
-
- /* Packets received while interrupts were disabled */
- status = macb_readl(bp, RSR);
- if (status) {
- if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
- macb_writel(bp, ISR, MACB_BIT(RCOMP));
- napi_reschedule(napi);
- } else {
- macb_writel(bp, IER, MACB_RX_INT_FLAGS);
- }
- }
-
- /* TODO: Handle errors */
-
- return work_done;
-}
-
-static irqreturn_t macb_interrupt(int irq, void *dev_id)
-{
- struct macb_queue *queue = dev_id;
- struct macb *bp = queue->bp;
- struct net_device *dev = bp->dev;
- u32 status, ctrl;
-
- status = queue_readl(queue, ISR);
-
- if (unlikely(!status))
- return IRQ_NONE;
-
- spin_lock(&bp->lock);
-
- while (status) {
- /* close possible race with dev_close */
- if (unlikely(!netif_running(dev))) {
- queue_writel(queue, IDR, -1);
- if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
- queue_writel(queue, ISR, -1);
- break;
- }
-
- netdev_vdbg(bp->dev, "queue = %u, isr = 0x%08lx\n",
- (unsigned int)(queue - bp->queues),
- (unsigned long)status);
-
- if (status & MACB_RX_INT_FLAGS) {
- /* There's no point taking any more interrupts
- * until we have processed the buffers. The
- * scheduling call may fail if the poll routine
- * is already scheduled, so disable interrupts
- * now.
- */
- queue_writel(queue, IDR, MACB_RX_INT_FLAGS);
- if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
- queue_writel(queue, ISR, MACB_BIT(RCOMP));
-
- if (napi_schedule_prep(&bp->napi)) {
- netdev_vdbg(bp->dev, "scheduling RX softirq\n");
- __napi_schedule(&bp->napi);
- }
- }
-
- if (unlikely(status & (MACB_TX_ERR_FLAGS))) {
- queue_writel(queue, IDR, MACB_TX_INT_FLAGS);
- schedule_work(&queue->tx_error_task);
-
- if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
- queue_writel(queue, ISR, MACB_TX_ERR_FLAGS);
-
- break;
- }
-
- if (status & MACB_BIT(TCOMP))
- macb_tx_interrupt(queue);
-
- /* Link change detection isn't possible with RMII, so we'll
- * add that if/when we get our hands on a full-blown MII PHY.
- */
-
- /* There is a hardware issue under heavy load where DMA can
- * stop, this causes endless "used buffer descriptor read"
- * interrupts but it can be cleared by re-enabling RX. See
- * the at91 manual, section 41.3.1 or the Zynq manual
- * section 16.7.4 for details.
- */
- if (status & MACB_BIT(RXUBR)) {
- ctrl = macb_readl(bp, NCR);
- macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE));
- wmb();
- macb_writel(bp, NCR, ctrl | MACB_BIT(RE));
-
- if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
- queue_writel(queue, ISR, MACB_BIT(RXUBR));
- }
-
- if (status & MACB_BIT(ISR_ROVR)) {
- /* We missed at least one packet */
- if (macb_is_gem(bp))
- bp->hw_stats.gem.rx_overruns++;
- else
- bp->hw_stats.macb.rx_overruns++;
-
- if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
- queue_writel(queue, ISR, MACB_BIT(ISR_ROVR));
- }
-
- if (status & MACB_BIT(HRESP)) {
- /* TODO: Reset the hardware, and maybe move the
- * netdev_err to a lower-priority context as well
- * (work queue?)
- */
- netdev_err(dev, "DMA bus error: HRESP not OK\n");
-
- if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
- queue_writel(queue, ISR, MACB_BIT(HRESP));
- }
-
- status = queue_readl(queue, ISR);
- }
-
- spin_unlock(&bp->lock);
-
- return IRQ_HANDLED;
-}
-
-#ifdef CONFIG_NET_POLL_CONTROLLER
-/* Polling receive - used by netconsole and other diagnostic tools
- * to allow network i/o with interrupts disabled.
- */
-static void macb_poll_controller(struct net_device *dev)
-{
- struct macb *bp = netdev_priv(dev);
- struct macb_queue *queue;
- unsigned long flags;
- unsigned int q;
-
- local_irq_save(flags);
- for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
- macb_interrupt(dev->irq, queue);
- local_irq_restore(flags);
-}
-#endif
-
-static unsigned int macb_tx_map(struct macb *bp,
- struct macb_queue *queue,
- struct sk_buff *skb,
- unsigned int hdrlen)
-{
- dma_addr_t mapping;
- unsigned int len, entry, i, tx_head = queue->tx_head;
- struct macb_tx_skb *tx_skb = NULL;
- struct macb_dma_desc *desc;
- unsigned int offset, size, count = 0;
- unsigned int f, nr_frags = skb_shinfo(skb)->nr_frags;
- unsigned int eof = 1, mss_mfs = 0;
- u32 ctrl, lso_ctrl = 0, seq_ctrl = 0;
-
- /* LSO */
- if (skb_shinfo(skb)->gso_size != 0) {
- if (ip_hdr(skb)->protocol == IPPROTO_UDP)
- /* UDP - UFO */
- lso_ctrl = MACB_LSO_UFO_ENABLE;
- else
- /* TCP - TSO */
- lso_ctrl = MACB_LSO_TSO_ENABLE;
- }
-
- /* First, map non-paged data */
- len = skb_headlen(skb);
-
- /* first buffer length */
- size = hdrlen;
-
- offset = 0;
- while (len) {
- entry = macb_tx_ring_wrap(bp, tx_head);
- tx_skb = &queue->tx_skb[entry];
-
- mapping = dma_map_single(&bp->pdev->dev,
- skb->data + offset,
- size, DMA_TO_DEVICE);
- if (dma_mapping_error(&bp->pdev->dev, mapping))
- goto dma_error;
-
- /* Save info to properly release resources */
- tx_skb->skb = NULL;
- tx_skb->mapping = mapping;
- tx_skb->size = size;
- tx_skb->mapped_as_page = false;
-
- len -= size;
- offset += size;
- count++;
- tx_head++;
-
- size = min(len, bp->max_tx_length);
- }
-
- /* Then, map paged data from fragments */
- for (f = 0; f < nr_frags; f++) {
- const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
-
- len = skb_frag_size(frag);
- offset = 0;
- while (len) {
- size = min(len, bp->max_tx_length);
- entry = macb_tx_ring_wrap(bp, tx_head);
- tx_skb = &queue->tx_skb[entry];
-
- mapping = skb_frag_dma_map(&bp->pdev->dev, frag,
- offset, size, DMA_TO_DEVICE);
- if (dma_mapping_error(&bp->pdev->dev, mapping))
- goto dma_error;
-
- /* Save info to properly release resources */
- tx_skb->skb = NULL;
- tx_skb->mapping = mapping;
- tx_skb->size = size;
- tx_skb->mapped_as_page = true;
-
- len -= size;
- offset += size;
- count++;
- tx_head++;
- }
- }
-
- /* Should never happen */
- if (unlikely(!tx_skb)) {
- netdev_err(bp->dev, "BUG! empty skb!\n");
- return 0;
- }
-
- /* This is the last buffer of the frame: save socket buffer */
- tx_skb->skb = skb;
-
- /* Update TX ring: update buffer descriptors in reverse order
- * to avoid race condition
- */
-
- /* Set 'TX_USED' bit in buffer descriptor at tx_head position
- * to set the end of TX queue
- */
- i = tx_head;
- entry = macb_tx_ring_wrap(bp, i);
- ctrl = MACB_BIT(TX_USED);
- desc = macb_tx_desc(queue, entry);
- desc->ctrl = ctrl;
-
- if (lso_ctrl) {
- if (lso_ctrl == MACB_LSO_UFO_ENABLE)
- /* include header and FCS in value given to h/w */
- mss_mfs = skb_shinfo(skb)->gso_size +
- skb_transport_offset(skb) +
- ETH_FCS_LEN;
- else /* TSO */ {
- mss_mfs = skb_shinfo(skb)->gso_size;
- /* TCP Sequence Number Source Select
- * can be set only for TSO
- */
- seq_ctrl = 0;
- }
- }
-
- do {
- i--;
- entry = macb_tx_ring_wrap(bp, i);
- tx_skb = &queue->tx_skb[entry];
- desc = macb_tx_desc(queue, entry);
-
- ctrl = (u32)tx_skb->size;
- if (eof) {
- ctrl |= MACB_BIT(TX_LAST);
- eof = 0;
- }
- if (unlikely(entry == (bp->tx_ring_size - 1)))
- ctrl |= MACB_BIT(TX_WRAP);
-
- /* First descriptor is header descriptor */
- if (i == queue->tx_head) {
- ctrl |= MACB_BF(TX_LSO, lso_ctrl);
- ctrl |= MACB_BF(TX_TCP_SEQ_SRC, seq_ctrl);
- } else
- /* Only set MSS/MFS on payload descriptors
- * (second or later descriptor)
- */
- ctrl |= MACB_BF(MSS_MFS, mss_mfs);
-
- /* Set TX buffer descriptor */
- macb_set_addr(bp, desc, tx_skb->mapping);
- /* desc->addr must be visible to hardware before clearing
- * 'TX_USED' bit in desc->ctrl.
- */
- wmb();
- desc->ctrl = ctrl;
- } while (i != queue->tx_head);
-
- queue->tx_head = tx_head;
-
- return count;
-
-dma_error:
- netdev_err(bp->dev, "TX DMA map failed\n");
-
- for (i = queue->tx_head; i != tx_head; i++) {
- tx_skb = macb_tx_skb(queue, i);
-
- macb_tx_unmap(bp, tx_skb);
- }
-
- return 0;
-}
-
-static netdev_features_t macb_features_check(struct sk_buff *skb,
- struct net_device *dev,
- netdev_features_t features)
-{
- unsigned int nr_frags, f;
- unsigned int hdrlen;
-
- /* Validate LSO compatibility */
-
- /* there is only one buffer */
- if (!skb_is_nonlinear(skb))
- return features;
-
- /* length of header */
- hdrlen = skb_transport_offset(skb);
- if (ip_hdr(skb)->protocol == IPPROTO_TCP)
- hdrlen += tcp_hdrlen(skb);
-
- /* For LSO:
- * When software supplies two or more payload buffers all payload buffers
- * apart from the last must be a multiple of 8 bytes in size.
- */
- if (!IS_ALIGNED(skb_headlen(skb) - hdrlen, MACB_TX_LEN_ALIGN))
- return features & ~MACB_NETIF_LSO;
-
- nr_frags = skb_shinfo(skb)->nr_frags;
- /* No need to check last fragment */
- nr_frags--;
- for (f = 0; f < nr_frags; f++) {
- const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
-
- if (!IS_ALIGNED(skb_frag_size(frag), MACB_TX_LEN_ALIGN))
- return features & ~MACB_NETIF_LSO;
- }
- return features;
-}
-
-static inline int macb_clear_csum(struct sk_buff *skb)
-{
- /* no change for packets without checksum offloading */
- if (skb->ip_summed != CHECKSUM_PARTIAL)
- return 0;
-
- /* make sure we can modify the header */
- if (unlikely(skb_cow_head(skb, 0)))
- return -1;
-
- /* initialize checksum field
- * This is required - at least for Zynq, which otherwise calculates
- * wrong UDP header checksums for UDP packets with UDP data len <=2
- */
- *(__sum16 *)(skb_checksum_start(skb) + skb->csum_offset) = 0;
- return 0;
-}
-
-static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
-{
- u16 queue_index = skb_get_queue_mapping(skb);
- struct macb *bp = netdev_priv(dev);
- struct macb_queue *queue = &bp->queues[queue_index];
- unsigned long flags;
- unsigned int desc_cnt, nr_frags, frag_size, f;
- unsigned int hdrlen;
- bool is_lso, is_udp = 0;
-
- is_lso = (skb_shinfo(skb)->gso_size != 0);
-
- if (is_lso) {
- is_udp = !!(ip_hdr(skb)->protocol == IPPROTO_UDP);
-
- /* length of headers */
- if (is_udp)
- /* only queue eth + ip headers separately for UDP */
- hdrlen = skb_transport_offset(skb);
- else
- hdrlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
- if (skb_headlen(skb) < hdrlen) {
- netdev_err(bp->dev, "Error - LSO headers fragmented!!!\n");
- /* if this is required, would need to copy to single buffer */
- return NETDEV_TX_BUSY;
- }
- } else
- hdrlen = min(skb_headlen(skb), bp->max_tx_length);
-
-#if defined(DEBUG) && defined(VERBOSE_DEBUG)
- netdev_vdbg(bp->dev,
- "start_xmit: queue %hu len %u head %p data %p tail %p end %p\n",
- queue_index, skb->len, skb->head, skb->data,
- skb_tail_pointer(skb), skb_end_pointer(skb));
- print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1,
- skb->data, 16, true);
-#endif
-
- /* Count how many TX buffer descriptors are needed to send this
- * socket buffer: skb fragments of jumbo frames may need to be
- * split into many buffer descriptors.
- */
- if (is_lso && (skb_headlen(skb) > hdrlen))
- /* extra header descriptor if also payload in first buffer */
- desc_cnt = DIV_ROUND_UP((skb_headlen(skb) - hdrlen), bp->max_tx_length) + 1;
- else
- desc_cnt = DIV_ROUND_UP(skb_headlen(skb), bp->max_tx_length);
- nr_frags = skb_shinfo(skb)->nr_frags;
- for (f = 0; f < nr_frags; f++) {
- frag_size = skb_frag_size(&skb_shinfo(skb)->frags[f]);
- desc_cnt += DIV_ROUND_UP(frag_size, bp->max_tx_length);
- }
-
- spin_lock_irqsave(&bp->lock, flags);
-
- /* This is a hard error, log it. */
- if (CIRC_SPACE(queue->tx_head, queue->tx_tail,
- bp->tx_ring_size) < desc_cnt) {
- netif_stop_subqueue(dev, queue_index);
- spin_unlock_irqrestore(&bp->lock, flags);
- netdev_dbg(bp->dev, "tx_head = %u, tx_tail = %u\n",
- queue->tx_head, queue->tx_tail);
- return NETDEV_TX_BUSY;
- }
-
- if (macb_clear_csum(skb)) {
- dev_kfree_skb_any(skb);
- goto unlock;
- }
-
- /* Map socket buffer for DMA transfer */
- if (!macb_tx_map(bp, queue, skb, hdrlen)) {
- dev_kfree_skb_any(skb);
- goto unlock;
- }
-
- /* Make newly initialized descriptor visible to hardware */
- wmb();
-
- skb_tx_timestamp(skb);
-
- macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
-
- if (CIRC_SPACE(queue->tx_head, queue->tx_tail, bp->tx_ring_size) < 1)
- netif_stop_subqueue(dev, queue_index);
-
-unlock:
- spin_unlock_irqrestore(&bp->lock, flags);
-
- return NETDEV_TX_OK;
-}
-
-static void macb_init_rx_buffer_size(struct macb *bp, size_t size)
-{
- if (!macb_is_gem(bp)) {
- bp->rx_buffer_size = MACB_RX_BUFFER_SIZE;
- } else {
- bp->rx_buffer_size = size;
-
- if (bp->rx_buffer_size % RX_BUFFER_MULTIPLE) {
- netdev_dbg(bp->dev,
- "RX buffer must be multiple of %d bytes, expanding\n",
- RX_BUFFER_MULTIPLE);
- bp->rx_buffer_size =
- roundup(bp->rx_buffer_size, RX_BUFFER_MULTIPLE);
- }
- }
-
- netdev_dbg(bp->dev, "mtu [%u] rx_buffer_size [%zu]\n",
- bp->dev->mtu, bp->rx_buffer_size);
-}
-
-static void gem_free_rx_buffers(struct macb *bp)
-{
- struct sk_buff *skb;
- struct macb_dma_desc *desc;
- dma_addr_t addr;
- int i;
-
- if (!bp->rx_skbuff)
- return;
-
- for (i = 0; i < bp->rx_ring_size; i++) {
- skb = bp->rx_skbuff[i];
-
- if (!skb)
- continue;
-
- desc = macb_rx_desc(bp, i);
- addr = macb_get_addr(bp, desc);
-
- dma_unmap_single(&bp->pdev->dev, addr, bp->rx_buffer_size,
- DMA_FROM_DEVICE);
- dev_kfree_skb_any(skb);
- skb = NULL;
- }
-
- kfree(bp->rx_skbuff);
- bp->rx_skbuff = NULL;
-}
-
-static void macb_free_rx_buffers(struct macb *bp)
-{
- if (bp->rx_buffers) {
- dma_free_coherent(&bp->pdev->dev,
- bp->rx_ring_size * bp->rx_buffer_size,
- bp->rx_buffers, bp->rx_buffers_dma);
- bp->rx_buffers = NULL;
- }
-}
-
-static void macb_free_consistent(struct macb *bp)
-{
- struct macb_queue *queue;
- unsigned int q;
-
- bp->macbgem_ops.mog_free_rx_buffers(bp);
- if (bp->rx_ring) {
- dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES(bp),
- bp->rx_ring, bp->rx_ring_dma);
- bp->rx_ring = NULL;
- }
-
- for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
- kfree(queue->tx_skb);
- queue->tx_skb = NULL;
- if (queue->tx_ring) {
- dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES(bp),
- queue->tx_ring, queue->tx_ring_dma);
- queue->tx_ring = NULL;
- }
- }
-}
-
-static int gem_alloc_rx_buffers(struct macb *bp)
-{
- int size;
-
- size = bp->rx_ring_size * sizeof(struct sk_buff *);
- bp->rx_skbuff = kzalloc(size, GFP_KERNEL);
- if (!bp->rx_skbuff)
- return -ENOMEM;
- else
- netdev_dbg(bp->dev,
- "Allocated %d RX struct sk_buff entries at %p\n",
- bp->rx_ring_size, bp->rx_skbuff);
- return 0;
-}
-
-static int macb_alloc_rx_buffers(struct macb *bp)
-{
- int size;
-
- size = bp->rx_ring_size * bp->rx_buffer_size;
- bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size,
- &bp->rx_buffers_dma, GFP_KERNEL);
- if (!bp->rx_buffers)
- return -ENOMEM;
-
- netdev_dbg(bp->dev,
- "Allocated RX buffers of %d bytes at %08lx (mapped %p)\n",
- size, (unsigned long)bp->rx_buffers_dma, bp->rx_buffers);
- return 0;
-}
-
-static int macb_alloc_consistent(struct macb *bp)
-{
- struct macb_queue *queue;
- unsigned int q;
- int size;
-
- for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
- size = TX_RING_BYTES(bp);
- queue->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
- &queue->tx_ring_dma,
- GFP_KERNEL);
- if (!queue->tx_ring)
- goto out_err;
- netdev_dbg(bp->dev,
- "Allocated TX ring for queue %u of %d bytes at %08lx (mapped %p)\n",
- q, size, (unsigned long)queue->tx_ring_dma,
- queue->tx_ring);
-
- size = bp->tx_ring_size * sizeof(struct macb_tx_skb);
- queue->tx_skb = kmalloc(size, GFP_KERNEL);
- if (!queue->tx_skb)
- goto out_err;
- }
-
- size = RX_RING_BYTES(bp);
- bp->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
- &bp->rx_ring_dma, GFP_KERNEL);
- if (!bp->rx_ring)
- goto out_err;
- netdev_dbg(bp->dev,
- "Allocated RX ring of %d bytes at %08lx (mapped %p)\n",
- size, (unsigned long)bp->rx_ring_dma, bp->rx_ring);
-
- if (bp->macbgem_ops.mog_alloc_rx_buffers(bp))
- goto out_err;
-
- return 0;
-
-out_err:
- macb_free_consistent(bp);
- return -ENOMEM;
-}
-
-static void gem_init_rings(struct macb *bp)
-{
- struct macb_queue *queue;
- struct macb_dma_desc *desc = NULL;
- unsigned int q;
- int i;
-
- for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
- for (i = 0; i < bp->tx_ring_size; i++) {
- desc = macb_tx_desc(queue, i);
- macb_set_addr(bp, desc, 0);
- desc->ctrl = MACB_BIT(TX_USED);
- }
- desc->ctrl |= MACB_BIT(TX_WRAP);
- queue->tx_head = 0;
- queue->tx_tail = 0;
- }
-
- bp->rx_tail = 0;
- bp->rx_prepared_head = 0;
-
- gem_rx_refill(bp);
-}
-
-static void macb_init_rings(struct macb *bp)
-{
- int i;
- struct macb_dma_desc *desc = NULL;
-
- macb_init_rx_ring(bp);
-
- for (i = 0; i < bp->tx_ring_size; i++) {
- desc = macb_tx_desc(&bp->queues[0], i);
- macb_set_addr(bp, desc, 0);
- desc->ctrl = MACB_BIT(TX_USED);
- }
- bp->queues[0].tx_head = 0;
- bp->queues[0].tx_tail = 0;
- desc->ctrl |= MACB_BIT(TX_WRAP);
-}
-
-static void macb_reset_hw(struct macb *bp)
-{
- struct macb_queue *queue;
- unsigned int q;
-
- /* Disable RX and TX (XXX: Should we halt the transmission
- * more gracefully?)
- */
- macb_writel(bp, NCR, 0);
-
- /* Clear the stats registers (XXX: Update stats first?) */
- macb_writel(bp, NCR, MACB_BIT(CLRSTAT));
-
- /* Clear all status flags */
- macb_writel(bp, TSR, -1);
- macb_writel(bp, RSR, -1);
-
- /* Disable all interrupts */
- for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
- queue_writel(queue, IDR, -1);
- queue_readl(queue, ISR);
- if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
- queue_writel(queue, ISR, -1);
- }
-}
-
-static u32 gem_mdc_clk_div(struct macb *bp)
-{
- u32 config;
- unsigned long pclk_hz = clk_get_rate(bp->pclk);
-
- if (pclk_hz <= 20000000)
- config = GEM_BF(CLK, GEM_CLK_DIV8);
- else if (pclk_hz <= 40000000)
- config = GEM_BF(CLK, GEM_CLK_DIV16);
- else if (pclk_hz <= 80000000)
- config = GEM_BF(CLK, GEM_CLK_DIV32);
- else if (pclk_hz <= 120000000)
- config = GEM_BF(CLK, GEM_CLK_DIV48);
- else if (pclk_hz <= 160000000)
- config = GEM_BF(CLK, GEM_CLK_DIV64);
- else
- config = GEM_BF(CLK, GEM_CLK_DIV96);
-
- return config;
-}
-
-static u32 macb_mdc_clk_div(struct macb *bp)
-{
- u32 config;
- unsigned long pclk_hz;
-
- if (macb_is_gem(bp))
- return gem_mdc_clk_div(bp);
-
- pclk_hz = clk_get_rate(bp->pclk);
- if (pclk_hz <= 20000000)
- config = MACB_BF(CLK, MACB_CLK_DIV8);
- else if (pclk_hz <= 40000000)
- config = MACB_BF(CLK, MACB_CLK_DIV16);
- else if (pclk_hz <= 80000000)
- config = MACB_BF(CLK, MACB_CLK_DIV32);
- else
- config = MACB_BF(CLK, MACB_CLK_DIV64);
-
- return config;
-}
-
-/* Get the DMA bus width field of the network configuration register that we
- * should program. We find the width from decoding the design configuration
- * register to find the maximum supported data bus width.
- */
-static u32 macb_dbw(struct macb *bp)
-{
- if (!macb_is_gem(bp))
- return 0;
-
- switch (GEM_BFEXT(DBWDEF, gem_readl(bp, DCFG1))) {
- case 4:
- return GEM_BF(DBW, GEM_DBW128);
- case 2:
- return GEM_BF(DBW, GEM_DBW64);
- case 1:
- default:
- return GEM_BF(DBW, GEM_DBW32);
- }
-}
-
-/* Configure the receive DMA engine
- * - use the correct receive buffer size
- * - set best burst length for DMA operations
- * (if not supported by FIFO, it will fallback to default)
- * - set both rx/tx packet buffers to full memory size
- * These are configurable parameters for GEM.
- */
-static void macb_configure_dma(struct macb *bp)
-{
- u32 dmacfg;
-
- if (macb_is_gem(bp)) {
- dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L);
- dmacfg |= GEM_BF(RXBS, bp->rx_buffer_size / RX_BUFFER_MULTIPLE);
- if (bp->dma_burst_length)
- dmacfg = GEM_BFINS(FBLDO, bp->dma_burst_length, dmacfg);
- dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L);
- dmacfg &= ~GEM_BIT(ENDIA_PKT);
-
- if (bp->native_io)
- dmacfg &= ~GEM_BIT(ENDIA_DESC);
- else
- dmacfg |= GEM_BIT(ENDIA_DESC); /* CPU in big endian */
-
- if (bp->dev->features & NETIF_F_HW_CSUM)
- dmacfg |= GEM_BIT(TXCOEN);
- else
- dmacfg &= ~GEM_BIT(TXCOEN);
-
-#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
- if (bp->hw_dma_cap & HW_DMA_CAP_64B)
- dmacfg |= GEM_BIT(ADDR64);
-#endif
-#ifdef CONFIG_MACB_USE_HWSTAMP
- if (bp->hw_dma_cap & HW_DMA_CAP_PTP)
- dmacfg |= GEM_BIT(RXEXT) | GEM_BIT(TXEXT);
-#endif
- netdev_dbg(bp->dev, "Cadence configure DMA with 0x%08x\n",
- dmacfg);
- gem_writel(bp, DMACFG, dmacfg);
- }
-}
-
-static void macb_init_hw(struct macb *bp)
-{
- struct macb_queue *queue;
- unsigned int q;
-
- u32 config;
-
- macb_reset_hw(bp);
- macb_set_hwaddr(bp);
-
- config = macb_mdc_clk_div(bp);
- if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII)
- config |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL);
- config |= MACB_BF(RBOF, NET_IP_ALIGN); /* Make eth data aligned */
- config |= MACB_BIT(PAE); /* PAuse Enable */
- config |= MACB_BIT(DRFCS); /* Discard Rx FCS */
- if (bp->caps & MACB_CAPS_JUMBO)
- config |= MACB_BIT(JFRAME); /* Enable jumbo frames */
- else
- config |= MACB_BIT(BIG); /* Receive oversized frames */
- if (bp->dev->flags & IFF_PROMISC)
- config |= MACB_BIT(CAF); /* Copy All Frames */
- else if (macb_is_gem(bp) && bp->dev->features & NETIF_F_RXCSUM)
- config |= GEM_BIT(RXCOEN);
- if (!(bp->dev->flags & IFF_BROADCAST))
- config |= MACB_BIT(NBC); /* No BroadCast */
- config |= macb_dbw(bp);
- macb_writel(bp, NCFGR, config);
- if ((bp->caps & MACB_CAPS_JUMBO) && bp->jumbo_max_len)
- gem_writel(bp, JML, bp->jumbo_max_len);
- bp->speed = SPEED_10;
- bp->duplex = DUPLEX_HALF;
- bp->rx_frm_len_mask = MACB_RX_FRMLEN_MASK;
- if (bp->caps & MACB_CAPS_JUMBO)
- bp->rx_frm_len_mask = MACB_RX_JFRMLEN_MASK;
-
- macb_configure_dma(bp);
-
- /* Initialize TX and RX buffers */
- macb_writel(bp, RBQP, lower_32_bits(bp->rx_ring_dma));
-#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
- if (bp->hw_dma_cap & HW_DMA_CAP_64B)
- macb_writel(bp, RBQPH, upper_32_bits(bp->rx_ring_dma));
-#endif
- for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
- queue_writel(queue, TBQP, lower_32_bits(queue->tx_ring_dma));
-#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
- if (bp->hw_dma_cap & HW_DMA_CAP_64B)
- queue_writel(queue, TBQPH, upper_32_bits(queue->tx_ring_dma));
-#endif
-
- /* Enable interrupts */
- queue_writel(queue, IER,
- MACB_RX_INT_FLAGS |
- MACB_TX_INT_FLAGS |
- MACB_BIT(HRESP));
- }
-
- /* Enable TX and RX */
- macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE) | MACB_BIT(MPE));
-}
-
-/* The hash address register is 64 bits long and takes up two
- * locations in the memory map. The least significant bits are stored
- * in EMAC_HSL and the most significant bits in EMAC_HSH.
- *
- * The unicast hash enable and the multicast hash enable bits in the
- * network configuration register enable the reception of hash matched
- * frames. The destination address is reduced to a 6 bit index into
- * the 64 bit hash register using the following hash function. The
- * hash function is an exclusive or of every sixth bit of the
- * destination address.
- *
- * hi[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47]
- * hi[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46]
- * hi[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45]
- * hi[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44]
- * hi[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43]
- * hi[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42]
- *
- * da[0] represents the least significant bit of the first byte
- * received, that is, the multicast/unicast indicator, and da[47]
- * represents the most significant bit of the last byte received. If
- * the hash index, hi[n], points to a bit that is set in the hash
- * register then the frame will be matched according to whether the
- * frame is multicast or unicast. A multicast match will be signalled
- * if the multicast hash enable bit is set, da[0] is 1 and the hash
- * index points to a bit set in the hash register. A unicast match
- * will be signalled if the unicast hash enable bit is set, da[0] is 0
- * and the hash index points to a bit set in the hash register. To
- * receive all multicast frames, the hash register should be set with
- * all ones and the multicast hash enable bit should be set in the
- * network configuration register.
- */
-
-static inline int hash_bit_value(int bitnr, __u8 *addr)
-{
- if (addr[bitnr / 8] & (1 << (bitnr % 8)))
- return 1;
- return 0;
-}
-
-/* Return the hash index value for the specified address. */
-static int hash_get_index(__u8 *addr)
-{
- int i, j, bitval;
- int hash_index = 0;
-
- for (j = 0; j < 6; j++) {
- for (i = 0, bitval = 0; i < 8; i++)
- bitval ^= hash_bit_value(i * 6 + j, addr);
-
- hash_index |= (bitval << j);
- }
-
- return hash_index;
-}
-
-/* Add multicast addresses to the internal multicast-hash table. */
-static void macb_sethashtable(struct net_device *dev)
-{
- struct netdev_hw_addr *ha;
- unsigned long mc_filter[2];
- unsigned int bitnr;
- struct macb *bp = netdev_priv(dev);
-
- mc_filter[0] = 0;
- mc_filter[1] = 0;
-
- netdev_for_each_mc_addr(ha, dev) {
- bitnr = hash_get_index(ha->addr);
- mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
- }
-
- macb_or_gem_writel(bp, HRB, mc_filter[0]);
- macb_or_gem_writel(bp, HRT, mc_filter[1]);
-}
-
-/* Enable/Disable promiscuous and multicast modes. */
-static void macb_set_rx_mode(struct net_device *dev)
-{
- unsigned long cfg;
- struct macb *bp = netdev_priv(dev);
-
- cfg = macb_readl(bp, NCFGR);
-
- if (dev->flags & IFF_PROMISC) {
- /* Enable promiscuous mode */
- cfg |= MACB_BIT(CAF);
-
- /* Disable RX checksum offload */
- if (macb_is_gem(bp))
- cfg &= ~GEM_BIT(RXCOEN);
- } else {
- /* Disable promiscuous mode */
- cfg &= ~MACB_BIT(CAF);
-
- /* Enable RX checksum offload only if requested */
- if (macb_is_gem(bp) && dev->features & NETIF_F_RXCSUM)
- cfg |= GEM_BIT(RXCOEN);
- }
-
- if (dev->flags & IFF_ALLMULTI) {
- /* Enable all multicast mode */
- macb_or_gem_writel(bp, HRB, -1);
- macb_or_gem_writel(bp, HRT, -1);
- cfg |= MACB_BIT(NCFGR_MTI);
- } else if (!netdev_mc_empty(dev)) {
- /* Enable specific multicasts */
- macb_sethashtable(dev);
- cfg |= MACB_BIT(NCFGR_MTI);
- } else if (dev->flags & (~IFF_ALLMULTI)) {
- /* Disable all multicast mode */
- macb_or_gem_writel(bp, HRB, 0);
- macb_or_gem_writel(bp, HRT, 0);
- cfg &= ~MACB_BIT(NCFGR_MTI);
- }
-
- macb_writel(bp, NCFGR, cfg);
-}
-
-static int macb_open(struct net_device *dev)
-{
- struct macb *bp = netdev_priv(dev);
- size_t bufsz = dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN;
- int err;
-
- netdev_dbg(bp->dev, "open\n");
-
- /* carrier starts down */
- netif_carrier_off(dev);
-
- /* if the phy is not yet register, retry later*/
- if (!dev->phydev)
- return -EAGAIN;
-
- /* RX buffers initialization */
- macb_init_rx_buffer_size(bp, bufsz);
-
- err = macb_alloc_consistent(bp);
- if (err) {
- netdev_err(dev, "Unable to allocate DMA memory (error %d)\n",
- err);
- return err;
- }
-
- napi_enable(&bp->napi);
-
- bp->macbgem_ops.mog_init_rings(bp);
- macb_init_hw(bp);
-
- /* schedule a link state check */
- phy_start(dev->phydev);
-
- netif_tx_start_all_queues(dev);
-
- if (bp->ptp_info)
- bp->ptp_info->ptp_init(dev);
-
- return 0;
-}
-
-static int macb_close(struct net_device *dev)
-{
- struct macb *bp = netdev_priv(dev);
- unsigned long flags;
-
- netif_tx_stop_all_queues(dev);
- napi_disable(&bp->napi);
-
- if (dev->phydev)
- phy_stop(dev->phydev);
-
- spin_lock_irqsave(&bp->lock, flags);
- macb_reset_hw(bp);
- netif_carrier_off(dev);
- spin_unlock_irqrestore(&bp->lock, flags);
-
- macb_free_consistent(bp);
-
- if (bp->ptp_info)
- bp->ptp_info->ptp_remove(dev);
-
- return 0;
-}
-
-static int macb_change_mtu(struct net_device *dev, int new_mtu)
-{
- if (netif_running(dev))
- return -EBUSY;
-
- dev->mtu = new_mtu;
-
- return 0;
-}
-
-static void gem_update_stats(struct macb *bp)
-{
- unsigned int i;
- u32 *p = &bp->hw_stats.gem.tx_octets_31_0;
-
- for (i = 0; i < GEM_STATS_LEN; ++i, ++p) {
- u32 offset = gem_statistics[i].offset;
- u64 val = bp->macb_reg_readl(bp, offset);
-
- bp->ethtool_stats[i] += val;
- *p += val;
-
- if (offset == GEM_OCTTXL || offset == GEM_OCTRXL) {
- /* Add GEM_OCTTXH, GEM_OCTRXH */
- val = bp->macb_reg_readl(bp, offset + 4);
- bp->ethtool_stats[i] += ((u64)val) << 32;
- *(++p) += val;
- }
- }
-}
-
-static struct net_device_stats *gem_get_stats(struct macb *bp)
-{
- struct gem_stats *hwstat = &bp->hw_stats.gem;
- struct net_device_stats *nstat = &bp->dev->stats;
-
- gem_update_stats(bp);
-
- nstat->rx_errors = (hwstat->rx_frame_check_sequence_errors +
- hwstat->rx_alignment_errors +
- hwstat->rx_resource_errors +
- hwstat->rx_overruns +
- hwstat->rx_oversize_frames +
- hwstat->rx_jabbers +
- hwstat->rx_undersized_frames +
- hwstat->rx_length_field_frame_errors);
- nstat->tx_errors = (hwstat->tx_late_collisions +
- hwstat->tx_excessive_collisions +
- hwstat->tx_underrun +
- hwstat->tx_carrier_sense_errors);
- nstat->multicast = hwstat->rx_multicast_frames;
- nstat->collisions = (hwstat->tx_single_collision_frames +
- hwstat->tx_multiple_collision_frames +
- hwstat->tx_excessive_collisions);
- nstat->rx_length_errors = (hwstat->rx_oversize_frames +
- hwstat->rx_jabbers +
- hwstat->rx_undersized_frames +
- hwstat->rx_length_field_frame_errors);
- nstat->rx_over_errors = hwstat->rx_resource_errors;
- nstat->rx_crc_errors = hwstat->rx_frame_check_sequence_errors;
- nstat->rx_frame_errors = hwstat->rx_alignment_errors;
- nstat->rx_fifo_errors = hwstat->rx_overruns;
- nstat->tx_aborted_errors = hwstat->tx_excessive_collisions;
- nstat->tx_carrier_errors = hwstat->tx_carrier_sense_errors;
- nstat->tx_fifo_errors = hwstat->tx_underrun;
-
- return nstat;
-}
-
-static void gem_get_ethtool_stats(struct net_device *dev,
- struct ethtool_stats *stats, u64 *data)
-{
- struct macb *bp;
-
- bp = netdev_priv(dev);
- gem_update_stats(bp);
- memcpy(data, &bp->ethtool_stats, sizeof(u64) * GEM_STATS_LEN);
-}
-
-static int gem_get_sset_count(struct net_device *dev, int sset)
-{
- switch (sset) {
- case ETH_SS_STATS:
- return GEM_STATS_LEN;
- default:
- return -EOPNOTSUPP;
- }
-}
-
-static void gem_get_ethtool_strings(struct net_device *dev, u32 sset, u8 *p)
-{
- unsigned int i;
-
- switch (sset) {
- case ETH_SS_STATS:
- for (i = 0; i < GEM_STATS_LEN; i++, p += ETH_GSTRING_LEN)
- memcpy(p, gem_statistics[i].stat_string,
- ETH_GSTRING_LEN);
- break;
- }
-}
-
-static struct net_device_stats *macb_get_stats(struct net_device *dev)
-{
- struct macb *bp = netdev_priv(dev);
- struct net_device_stats *nstat = &bp->dev->stats;
- struct macb_stats *hwstat = &bp->hw_stats.macb;
-
- if (macb_is_gem(bp))
- return gem_get_stats(bp);
-
- /* read stats from hardware */
- macb_update_stats(bp);
-
- /* Convert HW stats into netdevice stats */
- nstat->rx_errors = (hwstat->rx_fcs_errors +
- hwstat->rx_align_errors +
- hwstat->rx_resource_errors +
- hwstat->rx_overruns +
- hwstat->rx_oversize_pkts +
- hwstat->rx_jabbers +
- hwstat->rx_undersize_pkts +
- hwstat->rx_length_mismatch);
- nstat->tx_errors = (hwstat->tx_late_cols +
- hwstat->tx_excessive_cols +
- hwstat->tx_underruns +
- hwstat->tx_carrier_errors +
- hwstat->sqe_test_errors);
- nstat->collisions = (hwstat->tx_single_cols +
- hwstat->tx_multiple_cols +
- hwstat->tx_excessive_cols);
- nstat->rx_length_errors = (hwstat->rx_oversize_pkts +
- hwstat->rx_jabbers +
- hwstat->rx_undersize_pkts +
- hwstat->rx_length_mismatch);
- nstat->rx_over_errors = hwstat->rx_resource_errors +
- hwstat->rx_overruns;
- nstat->rx_crc_errors = hwstat->rx_fcs_errors;
- nstat->rx_frame_errors = hwstat->rx_align_errors;
- nstat->rx_fifo_errors = hwstat->rx_overruns;
- /* XXX: What does "missed" mean? */
- nstat->tx_aborted_errors = hwstat->tx_excessive_cols;
- nstat->tx_carrier_errors = hwstat->tx_carrier_errors;
- nstat->tx_fifo_errors = hwstat->tx_underruns;
- /* Don't know about heartbeat or window errors... */
-
- return nstat;
-}
-
-static int macb_get_regs_len(struct net_device *netdev)
-{
- return MACB_GREGS_NBR * sizeof(u32);
-}
-
-static void macb_get_regs(struct net_device *dev, struct ethtool_regs *regs,
- void *p)
-{
- struct macb *bp = netdev_priv(dev);
- unsigned int tail, head;
- u32 *regs_buff = p;
-
- regs->version = (macb_readl(bp, MID) & ((1 << MACB_REV_SIZE) - 1))
- | MACB_GREGS_VERSION;
-
- tail = macb_tx_ring_wrap(bp, bp->queues[0].tx_tail);
- head = macb_tx_ring_wrap(bp, bp->queues[0].tx_head);
-
- regs_buff[0] = macb_readl(bp, NCR);
- regs_buff[1] = macb_or_gem_readl(bp, NCFGR);
- regs_buff[2] = macb_readl(bp, NSR);
- regs_buff[3] = macb_readl(bp, TSR);
- regs_buff[4] = macb_readl(bp, RBQP);
- regs_buff[5] = macb_readl(bp, TBQP);
- regs_buff[6] = macb_readl(bp, RSR);
- regs_buff[7] = macb_readl(bp, IMR);
-
- regs_buff[8] = tail;
- regs_buff[9] = head;
- regs_buff[10] = macb_tx_dma(&bp->queues[0], tail);
- regs_buff[11] = macb_tx_dma(&bp->queues[0], head);
-
- if (!(bp->caps & MACB_CAPS_USRIO_DISABLED))
- regs_buff[12] = macb_or_gem_readl(bp, USRIO);
- if (macb_is_gem(bp))
- regs_buff[13] = gem_readl(bp, DMACFG);
-}
-
-static void macb_get_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
-{
- struct macb *bp = netdev_priv(netdev);
-
- wol->supported = 0;
- wol->wolopts = 0;
-
- if (bp->wol & MACB_WOL_HAS_MAGIC_PACKET) {
- wol->supported = WAKE_MAGIC;
-
- if (bp->wol & MACB_WOL_ENABLED)
- wol->wolopts |= WAKE_MAGIC;
- }
-}
-
-static int macb_set_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
-{
- struct macb *bp = netdev_priv(netdev);
-
- if (!(bp->wol & MACB_WOL_HAS_MAGIC_PACKET) ||
- (wol->wolopts & ~WAKE_MAGIC))
- return -EOPNOTSUPP;
-
- if (wol->wolopts & WAKE_MAGIC)
- bp->wol |= MACB_WOL_ENABLED;
- else
- bp->wol &= ~MACB_WOL_ENABLED;
-
- device_set_wakeup_enable(&bp->pdev->dev, bp->wol & MACB_WOL_ENABLED);
-
- return 0;
-}
-
-static void macb_get_ringparam(struct net_device *netdev,
- struct ethtool_ringparam *ring)
-{
- struct macb *bp = netdev_priv(netdev);
-
- ring->rx_max_pending = MAX_RX_RING_SIZE;
- ring->tx_max_pending = MAX_TX_RING_SIZE;
-
- ring->rx_pending = bp->rx_ring_size;
- ring->tx_pending = bp->tx_ring_size;
-}
-
-static int macb_set_ringparam(struct net_device *netdev,
- struct ethtool_ringparam *ring)
-{
- struct macb *bp = netdev_priv(netdev);
- u32 new_rx_size, new_tx_size;
- unsigned int reset = 0;
-
- if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending))
- return -EINVAL;
-
- new_rx_size = clamp_t(u32, ring->rx_pending,
- MIN_RX_RING_SIZE, MAX_RX_RING_SIZE);
- new_rx_size = roundup_pow_of_two(new_rx_size);
-
- new_tx_size = clamp_t(u32, ring->tx_pending,
- MIN_TX_RING_SIZE, MAX_TX_RING_SIZE);
- new_tx_size = roundup_pow_of_two(new_tx_size);
-
- if ((new_tx_size == bp->tx_ring_size) &&
- (new_rx_size == bp->rx_ring_size)) {
- /* nothing to do */
- return 0;
- }
-
- if (netif_running(bp->dev)) {
- reset = 1;
- macb_close(bp->dev);
- }
-
- bp->rx_ring_size = new_rx_size;
- bp->tx_ring_size = new_tx_size;
-
- if (reset)
- macb_open(bp->dev);
-
- return 0;
-}
-
-static int macb_get_ts_info(struct net_device *netdev,
- struct ethtool_ts_info *info)
-{
- struct macb *bp = netdev_priv(netdev);
-
- if (bp->ptp_info)
- return bp->ptp_info->get_ts_info(netdev, info);
-
- return ethtool_op_get_ts_info(netdev, info);
-}
-
-static const struct ethtool_ops macb_ethtool_ops = {
- .get_regs_len = macb_get_regs_len,
- .get_regs = macb_get_regs,
- .get_link = ethtool_op_get_link,
- .get_ts_info = ethtool_op_get_ts_info,
- .get_wol = macb_get_wol,
- .set_wol = macb_set_wol,
- .get_link_ksettings = phy_ethtool_get_link_ksettings,
- .set_link_ksettings = phy_ethtool_set_link_ksettings,
- .get_ringparam = macb_get_ringparam,
- .set_ringparam = macb_set_ringparam,
-};
-
-static const struct ethtool_ops gem_ethtool_ops = {
- .get_regs_len = macb_get_regs_len,
- .get_regs = macb_get_regs,
- .get_link = ethtool_op_get_link,
- .get_ts_info = macb_get_ts_info,
- .get_ethtool_stats = gem_get_ethtool_stats,
- .get_strings = gem_get_ethtool_strings,
- .get_sset_count = gem_get_sset_count,
- .get_link_ksettings = phy_ethtool_get_link_ksettings,
- .set_link_ksettings = phy_ethtool_set_link_ksettings,
- .get_ringparam = macb_get_ringparam,
- .set_ringparam = macb_set_ringparam,
-};
-
-static int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
-{
- struct phy_device *phydev = dev->phydev;
- struct macb *bp = netdev_priv(dev);
-
- if (!netif_running(dev))
- return -EINVAL;
-
- if (!phydev)
- return -ENODEV;
-
- if (!bp->ptp_info)
- return phy_mii_ioctl(phydev, rq, cmd);
-
- switch (cmd) {
- case SIOCSHWTSTAMP:
- return bp->ptp_info->set_hwtst(dev, rq, cmd);
- case SIOCGHWTSTAMP:
- return bp->ptp_info->get_hwtst(dev, rq);
- default:
- return phy_mii_ioctl(phydev, rq, cmd);
- }
-}
-
-static int macb_set_features(struct net_device *netdev,
- netdev_features_t features)
-{
- struct macb *bp = netdev_priv(netdev);
- netdev_features_t changed = features ^ netdev->features;
-
- /* TX checksum offload */
- if ((changed & NETIF_F_HW_CSUM) && macb_is_gem(bp)) {
- u32 dmacfg;
-
- dmacfg = gem_readl(bp, DMACFG);
- if (features & NETIF_F_HW_CSUM)
- dmacfg |= GEM_BIT(TXCOEN);
- else
- dmacfg &= ~GEM_BIT(TXCOEN);
- gem_writel(bp, DMACFG, dmacfg);
- }
-
- /* RX checksum offload */
- if ((changed & NETIF_F_RXCSUM) && macb_is_gem(bp)) {
- u32 netcfg;
-
- netcfg = gem_readl(bp, NCFGR);
- if (features & NETIF_F_RXCSUM &&
- !(netdev->flags & IFF_PROMISC))
- netcfg |= GEM_BIT(RXCOEN);
- else
- netcfg &= ~GEM_BIT(RXCOEN);
- gem_writel(bp, NCFGR, netcfg);
- }
-
- return 0;
-}
-
-static const struct net_device_ops macb_netdev_ops = {
- .ndo_open = macb_open,
- .ndo_stop = macb_close,
- .ndo_start_xmit = macb_start_xmit,
- .ndo_set_rx_mode = macb_set_rx_mode,
- .ndo_get_stats = macb_get_stats,
- .ndo_do_ioctl = macb_ioctl,
- .ndo_validate_addr = eth_validate_addr,
- .ndo_change_mtu = macb_change_mtu,
- .ndo_set_mac_address = eth_mac_addr,
-#ifdef CONFIG_NET_POLL_CONTROLLER
- .ndo_poll_controller = macb_poll_controller,
-#endif
- .ndo_set_features = macb_set_features,
- .ndo_features_check = macb_features_check,
-};
-
-/* Configure peripheral capabilities according to device tree
- * and integration options used
- */
-static void macb_configure_caps(struct macb *bp,
- const struct macb_config *dt_conf)
-{
- u32 dcfg;
-
- if (dt_conf)
- bp->caps = dt_conf->caps;
-
- if (hw_is_gem(bp->regs, bp->native_io)) {
- bp->caps |= MACB_CAPS_MACB_IS_GEM;
-
- dcfg = gem_readl(bp, DCFG1);
- if (GEM_BFEXT(IRQCOR, dcfg) == 0)
- bp->caps |= MACB_CAPS_ISR_CLEAR_ON_WRITE;
- dcfg = gem_readl(bp, DCFG2);
- if ((dcfg & (GEM_BIT(RX_PKT_BUFF) | GEM_BIT(TX_PKT_BUFF))) == 0)
- bp->caps |= MACB_CAPS_FIFO_MODE;
- if (IS_ENABLED(CONFIG_MACB_USE_HWSTAMP) && gem_has_ptp(bp)) {
- if (!GEM_BFEXT(TSU, gem_readl(bp, DCFG5)))
- pr_err("GEM doesn't support hardware ptp.\n");
- else
- bp->hw_dma_cap |= HW_DMA_CAP_PTP;
- }
- }
-
- dev_dbg(&bp->pdev->dev, "Cadence caps 0x%08x\n", bp->caps);
-}
-
-static void macb_probe_queues(void __iomem *mem,
- bool native_io,
- unsigned int *queue_mask,
- unsigned int *num_queues)
-{
- unsigned int hw_q;
-
- *queue_mask = 0x1;
- *num_queues = 1;
-
- /* is it macb or gem ?
- *
- * We need to read directly from the hardware here because
- * we are early in the probe process and don't have the
- * MACB_CAPS_MACB_IS_GEM flag positioned
- */
- if (!hw_is_gem(mem, native_io))
- return;
-
- /* bit 0 is never set but queue 0 always exists */
- *queue_mask = readl_relaxed(mem + GEM_DCFG6) & 0xff;
-
- *queue_mask |= 0x1;
-
- for (hw_q = 1; hw_q < MACB_MAX_QUEUES; ++hw_q)
- if (*queue_mask & (1 << hw_q))
- (*num_queues)++;
-}
-
-static int macb_clk_init(struct platform_device *pdev, struct clk **pclk,
- struct clk **hclk, struct clk **tx_clk,
- struct clk **rx_clk)
-{
- struct macb_platform_data *pdata;
- int err;
-
- pdata = dev_get_platdata(&pdev->dev);
- if (pdata) {
- *pclk = pdata->pclk;
- *hclk = pdata->hclk;
- } else {
- *pclk = devm_clk_get(&pdev->dev, "pclk");
- *hclk = devm_clk_get(&pdev->dev, "hclk");
- }
-
- if (IS_ERR(*pclk)) {
- err = PTR_ERR(*pclk);
- dev_err(&pdev->dev, "failed to get macb_clk (%u)\n", err);
- return err;
- }
-
- if (IS_ERR(*hclk)) {
- err = PTR_ERR(*hclk);
- dev_err(&pdev->dev, "failed to get hclk (%u)\n", err);
- return err;
- }
-
- *tx_clk = devm_clk_get(&pdev->dev, "tx_clk");
- if (IS_ERR(*tx_clk))
- *tx_clk = NULL;
-
- *rx_clk = devm_clk_get(&pdev->dev, "rx_clk");
- if (IS_ERR(*rx_clk))
- *rx_clk = NULL;
-
- err = clk_prepare_enable(*pclk);
- if (err) {
- dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err);
- return err;
- }
-
- err = clk_prepare_enable(*hclk);
- if (err) {
- dev_err(&pdev->dev, "failed to enable hclk (%u)\n", err);
- goto err_disable_pclk;
- }
-
- err = clk_prepare_enable(*tx_clk);
- if (err) {
- dev_err(&pdev->dev, "failed to enable tx_clk (%u)\n", err);
- goto err_disable_hclk;
- }
-
- err = clk_prepare_enable(*rx_clk);
- if (err) {
- dev_err(&pdev->dev, "failed to enable rx_clk (%u)\n", err);
- goto err_disable_txclk;
- }
-
- return 0;
-
-err_disable_txclk:
- clk_disable_unprepare(*tx_clk);
-
-err_disable_hclk:
- clk_disable_unprepare(*hclk);
-
-err_disable_pclk:
- clk_disable_unprepare(*pclk);
-
- return err;
-}
-
-static int macb_init(struct platform_device *pdev)
-{
- struct net_device *dev = platform_get_drvdata(pdev);
- unsigned int hw_q, q;
- struct macb *bp = netdev_priv(dev);
- struct macb_queue *queue;
- int err;
- u32 val;
-
- bp->tx_ring_size = DEFAULT_TX_RING_SIZE;
- bp->rx_ring_size = DEFAULT_RX_RING_SIZE;
-
- /* set the queue register mapping once for all: queue0 has a special
- * register mapping but we don't want to test the queue index then
- * compute the corresponding register offset at run time.
- */
- for (hw_q = 0, q = 0; hw_q < MACB_MAX_QUEUES; ++hw_q) {
- if (!(bp->queue_mask & (1 << hw_q)))
- continue;
-
- queue = &bp->queues[q];
- queue->bp = bp;
- if (hw_q) {
- queue->ISR = GEM_ISR(hw_q - 1);
- queue->IER = GEM_IER(hw_q - 1);
- queue->IDR = GEM_IDR(hw_q - 1);
- queue->IMR = GEM_IMR(hw_q - 1);
- queue->TBQP = GEM_TBQP(hw_q - 1);
-#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
- if (bp->hw_dma_cap & HW_DMA_CAP_64B)
- queue->TBQPH = GEM_TBQPH(hw_q - 1);
-#endif
- } else {
- /* queue0 uses legacy registers */
- queue->ISR = MACB_ISR;
- queue->IER = MACB_IER;
- queue->IDR = MACB_IDR;
- queue->IMR = MACB_IMR;
- queue->TBQP = MACB_TBQP;
-#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
- if (bp->hw_dma_cap & HW_DMA_CAP_64B)
- queue->TBQPH = MACB_TBQPH;
-#endif
- }
-
- /* get irq: here we use the linux queue index, not the hardware
- * queue index. the queue irq definitions in the device tree
- * must remove the optional gaps that could exist in the
- * hardware queue mask.
- */
- queue->irq = platform_get_irq(pdev, q);
- err = devm_request_irq(&pdev->dev, queue->irq, macb_interrupt,
- IRQF_SHARED, dev->name, queue);
- if (err) {
- dev_err(&pdev->dev,
- "Unable to request IRQ %d (error %d)\n",
- queue->irq, err);
- return err;
- }
-
- INIT_WORK(&queue->tx_error_task, macb_tx_error_task);
- q++;
- }
-
- dev->netdev_ops = &macb_netdev_ops;
- netif_napi_add(dev, &bp->napi, macb_poll, 64);
-
- /* setup appropriated routines according to adapter type */
- if (macb_is_gem(bp)) {
- bp->max_tx_length = GEM_MAX_TX_LEN;
- bp->macbgem_ops.mog_alloc_rx_buffers = gem_alloc_rx_buffers;
- bp->macbgem_ops.mog_free_rx_buffers = gem_free_rx_buffers;
- bp->macbgem_ops.mog_init_rings = gem_init_rings;
- bp->macbgem_ops.mog_rx = gem_rx;
- dev->ethtool_ops = &gem_ethtool_ops;
- } else {
- bp->max_tx_length = MACB_MAX_TX_LEN;
- bp->macbgem_ops.mog_alloc_rx_buffers = macb_alloc_rx_buffers;
- bp->macbgem_ops.mog_free_rx_buffers = macb_free_rx_buffers;
- bp->macbgem_ops.mog_init_rings = macb_init_rings;
- bp->macbgem_ops.mog_rx = macb_rx;
- dev->ethtool_ops = &macb_ethtool_ops;
- }
-
- /* Set features */
- dev->hw_features = NETIF_F_SG;
-
- /* Check LSO capability */
- if (GEM_BFEXT(PBUF_LSO, gem_readl(bp, DCFG6)))
- dev->hw_features |= MACB_NETIF_LSO;
-
- /* Checksum offload is only available on gem with packet buffer */
- if (macb_is_gem(bp) && !(bp->caps & MACB_CAPS_FIFO_MODE))
- dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
- if (bp->caps & MACB_CAPS_SG_DISABLED)
- dev->hw_features &= ~NETIF_F_SG;
- dev->features = dev->hw_features;
-
- if (!(bp->caps & MACB_CAPS_USRIO_DISABLED)) {
- val = 0;
- if (bp->phy_interface == PHY_INTERFACE_MODE_RGMII)
- val = GEM_BIT(RGMII);
- else if (bp->phy_interface == PHY_INTERFACE_MODE_RMII &&
- (bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII))
- val = MACB_BIT(RMII);
- else if (!(bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII))
- val = MACB_BIT(MII);
-
- if (bp->caps & MACB_CAPS_USRIO_HAS_CLKEN)
- val |= MACB_BIT(CLKEN);
-
- macb_or_gem_writel(bp, USRIO, val);
- }
-
- /* Set MII management clock divider */
- val = macb_mdc_clk_div(bp);
- val |= macb_dbw(bp);
- if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII)
- val |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL);
- macb_writel(bp, NCFGR, val);
-
- return 0;
-}
-
-#if defined(CONFIG_OF)
-/* 1518 rounded up */
-#define AT91ETHER_MAX_RBUFF_SZ 0x600
-/* max number of receive buffers */
-#define AT91ETHER_MAX_RX_DESCR 9
-
-/* Initialize and start the Receiver and Transmit subsystems */
-static int at91ether_start(struct net_device *dev)
-{
- struct macb *lp = netdev_priv(dev);
- struct macb_dma_desc *desc;
- dma_addr_t addr;
- u32 ctl;
- int i;
-
- lp->rx_ring = dma_alloc_coherent(&lp->pdev->dev,
- (AT91ETHER_MAX_RX_DESCR *
- macb_dma_desc_get_size(lp)),
- &lp->rx_ring_dma, GFP_KERNEL);
- if (!lp->rx_ring)
- return -ENOMEM;
-
- lp->rx_buffers = dma_alloc_coherent(&lp->pdev->dev,
- AT91ETHER_MAX_RX_DESCR *
- AT91ETHER_MAX_RBUFF_SZ,
- &lp->rx_buffers_dma, GFP_KERNEL);
- if (!lp->rx_buffers) {
- dma_free_coherent(&lp->pdev->dev,
- AT91ETHER_MAX_RX_DESCR *
- macb_dma_desc_get_size(lp),
- lp->rx_ring, lp->rx_ring_dma);
- lp->rx_ring = NULL;
- return -ENOMEM;
- }
-
- addr = lp->rx_buffers_dma;
- for (i = 0; i < AT91ETHER_MAX_RX_DESCR; i++) {
- desc = macb_rx_desc(lp, i);
- macb_set_addr(lp, desc, addr);
- desc->ctrl = 0;
- addr += AT91ETHER_MAX_RBUFF_SZ;
- }
-
- /* Set the Wrap bit on the last descriptor */
- desc->addr |= MACB_BIT(RX_WRAP);
-
- /* Reset buffer index */
- lp->rx_tail = 0;
-
- /* Program address of descriptor list in Rx Buffer Queue register */
- macb_writel(lp, RBQP, lp->rx_ring_dma);
-
- /* Enable Receive and Transmit */
- ctl = macb_readl(lp, NCR);
- macb_writel(lp, NCR, ctl | MACB_BIT(RE) | MACB_BIT(TE));
-
- return 0;
-}
-
-/* Open the ethernet interface */
-static int at91ether_open(struct net_device *dev)
-{
- struct macb *lp = netdev_priv(dev);
- u32 ctl;
- int ret;
-
- /* Clear internal statistics */
- ctl = macb_readl(lp, NCR);
- macb_writel(lp, NCR, ctl | MACB_BIT(CLRSTAT));
-
- macb_set_hwaddr(lp);
-
- ret = at91ether_start(dev);
- if (ret)
- return ret;
-
- /* Enable MAC interrupts */
- macb_writel(lp, IER, MACB_BIT(RCOMP) |
- MACB_BIT(RXUBR) |
- MACB_BIT(ISR_TUND) |
- MACB_BIT(ISR_RLE) |
- MACB_BIT(TCOMP) |
- MACB_BIT(ISR_ROVR) |
- MACB_BIT(HRESP));
-
- /* schedule a link state check */
- phy_start(dev->phydev);
-
- netif_start_queue(dev);
-
- return 0;
-}
-
-/* Close the interface */
-static int at91ether_close(struct net_device *dev)
-{
- struct macb *lp = netdev_priv(dev);
- u32 ctl;
-
- /* Disable Receiver and Transmitter */
- ctl = macb_readl(lp, NCR);
- macb_writel(lp, NCR, ctl & ~(MACB_BIT(TE) | MACB_BIT(RE)));
-
- /* Disable MAC interrupts */
- macb_writel(lp, IDR, MACB_BIT(RCOMP) |
- MACB_BIT(RXUBR) |
- MACB_BIT(ISR_TUND) |
- MACB_BIT(ISR_RLE) |
- MACB_BIT(TCOMP) |
- MACB_BIT(ISR_ROVR) |
- MACB_BIT(HRESP));
-
- netif_stop_queue(dev);
-
- dma_free_coherent(&lp->pdev->dev,
- AT91ETHER_MAX_RX_DESCR *
- macb_dma_desc_get_size(lp),
- lp->rx_ring, lp->rx_ring_dma);
- lp->rx_ring = NULL;
-
- dma_free_coherent(&lp->pdev->dev,
- AT91ETHER_MAX_RX_DESCR * AT91ETHER_MAX_RBUFF_SZ,
- lp->rx_buffers, lp->rx_buffers_dma);
- lp->rx_buffers = NULL;
-
- return 0;
-}
-
-/* Transmit packet */
-static int at91ether_start_xmit(struct sk_buff *skb, struct net_device *dev)
-{
- struct macb *lp = netdev_priv(dev);
-
- if (macb_readl(lp, TSR) & MACB_BIT(RM9200_BNQ)) {
- netif_stop_queue(dev);
-
- /* Store packet information (to free when Tx completed) */
- lp->skb = skb;
- lp->skb_length = skb->len;
- lp->skb_physaddr = dma_map_single(NULL, skb->data, skb->len,
- DMA_TO_DEVICE);
- if (dma_mapping_error(NULL, lp->skb_physaddr)) {
- dev_kfree_skb_any(skb);
- dev->stats.tx_dropped++;
- netdev_err(dev, "%s: DMA mapping error\n", __func__);
- return NETDEV_TX_OK;
- }
-
- /* Set address of the data in the Transmit Address register */
- macb_writel(lp, TAR, lp->skb_physaddr);
- /* Set length of the packet in the Transmit Control register */
- macb_writel(lp, TCR, skb->len);
-
- } else {
- netdev_err(dev, "%s called, but device is busy!\n", __func__);
- return NETDEV_TX_BUSY;
- }
-
- return NETDEV_TX_OK;
-}
-
-/* Extract received frame from buffer descriptors and sent to upper layers.
- * (Called from interrupt context)
- */
-static void at91ether_rx(struct net_device *dev)
-{
- struct macb *lp = netdev_priv(dev);
- struct macb_dma_desc *desc;
- unsigned char *p_recv;
- struct sk_buff *skb;
- unsigned int pktlen;
-
- desc = macb_rx_desc(lp, lp->rx_tail);
- while (desc->addr & MACB_BIT(RX_USED)) {
- p_recv = lp->rx_buffers + lp->rx_tail * AT91ETHER_MAX_RBUFF_SZ;
- pktlen = MACB_BF(RX_FRMLEN, desc->ctrl);
- skb = netdev_alloc_skb(dev, pktlen + 2);
- if (skb) {
- skb_reserve(skb, 2);
- skb_put_data(skb, p_recv, pktlen);
-
- skb->protocol = eth_type_trans(skb, dev);
- dev->stats.rx_packets++;
- dev->stats.rx_bytes += pktlen;
- netif_rx(skb);
- } else {
- dev->stats.rx_dropped++;
- }
-
- if (desc->ctrl & MACB_BIT(RX_MHASH_MATCH))
- dev->stats.multicast++;
-
- /* reset ownership bit */
- desc->addr &= ~MACB_BIT(RX_USED);
-
- /* wrap after last buffer */
- if (lp->rx_tail == AT91ETHER_MAX_RX_DESCR - 1)
- lp->rx_tail = 0;
- else
- lp->rx_tail++;
-
- desc = macb_rx_desc(lp, lp->rx_tail);
- }
-}
-
-/* MAC interrupt handler */
-static irqreturn_t at91ether_interrupt(int irq, void *dev_id)
-{
- struct net_device *dev = dev_id;
- struct macb *lp = netdev_priv(dev);
- u32 intstatus, ctl;
-
- /* MAC Interrupt Status register indicates what interrupts are pending.
- * It is automatically cleared once read.
- */
- intstatus = macb_readl(lp, ISR);
-
- /* Receive complete */
- if (intstatus & MACB_BIT(RCOMP))
- at91ether_rx(dev);
-
- /* Transmit complete */
- if (intstatus & MACB_BIT(TCOMP)) {
- /* The TCOM bit is set even if the transmission failed */
- if (intstatus & (MACB_BIT(ISR_TUND) | MACB_BIT(ISR_RLE)))
- dev->stats.tx_errors++;
-
- if (lp->skb) {
- dev_kfree_skb_irq(lp->skb);
- lp->skb = NULL;
- dma_unmap_single(NULL, lp->skb_physaddr,
- lp->skb_length, DMA_TO_DEVICE);
- dev->stats.tx_packets++;
- dev->stats.tx_bytes += lp->skb_length;
- }
- netif_wake_queue(dev);
- }
-
- /* Work-around for EMAC Errata section 41.3.1 */
- if (intstatus & MACB_BIT(RXUBR)) {
- ctl = macb_readl(lp, NCR);
- macb_writel(lp, NCR, ctl & ~MACB_BIT(RE));
- wmb();
- macb_writel(lp, NCR, ctl | MACB_BIT(RE));
- }
-
- if (intstatus & MACB_BIT(ISR_ROVR))
- netdev_err(dev, "ROVR error\n");
-
- return IRQ_HANDLED;
-}
-
-#ifdef CONFIG_NET_POLL_CONTROLLER
-static void at91ether_poll_controller(struct net_device *dev)
-{
- unsigned long flags;
-
- local_irq_save(flags);
- at91ether_interrupt(dev->irq, dev);
- local_irq_restore(flags);
-}
-#endif
-
-static const struct net_device_ops at91ether_netdev_ops = {
- .ndo_open = at91ether_open,
- .ndo_stop = at91ether_close,
- .ndo_start_xmit = at91ether_start_xmit,
- .ndo_get_stats = macb_get_stats,
- .ndo_set_rx_mode = macb_set_rx_mode,
- .ndo_set_mac_address = eth_mac_addr,
- .ndo_do_ioctl = macb_ioctl,
- .ndo_validate_addr = eth_validate_addr,
-#ifdef CONFIG_NET_POLL_CONTROLLER
- .ndo_poll_controller = at91ether_poll_controller,
-#endif
-};
-
-static int at91ether_clk_init(struct platform_device *pdev, struct clk **pclk,
- struct clk **hclk, struct clk **tx_clk,
- struct clk **rx_clk)
-{
- int err;
-
- *hclk = NULL;
- *tx_clk = NULL;
- *rx_clk = NULL;
-
- *pclk = devm_clk_get(&pdev->dev, "ether_clk");
- if (IS_ERR(*pclk))
- return PTR_ERR(*pclk);
-
- err = clk_prepare_enable(*pclk);
- if (err) {
- dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err);
- return err;
- }
-
- return 0;
-}
-
-static int at91ether_init(struct platform_device *pdev)
-{
- struct net_device *dev = platform_get_drvdata(pdev);
- struct macb *bp = netdev_priv(dev);
- int err;
- u32 reg;
-
- dev->netdev_ops = &at91ether_netdev_ops;
- dev->ethtool_ops = &macb_ethtool_ops;
-
- err = devm_request_irq(&pdev->dev, dev->irq, at91ether_interrupt,
- 0, dev->name, dev);
- if (err)
- return err;
-
- macb_writel(bp, NCR, 0);
-
- reg = MACB_BF(CLK, MACB_CLK_DIV32) | MACB_BIT(BIG);
- if (bp->phy_interface == PHY_INTERFACE_MODE_RMII)
- reg |= MACB_BIT(RM9200_RMII);
-
- macb_writel(bp, NCFGR, reg);
-
- return 0;
-}
-
-static const struct macb_config at91sam9260_config = {
- .caps = MACB_CAPS_USRIO_HAS_CLKEN | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
- .clk_init = macb_clk_init,
- .init = macb_init,
-};
-
-static const struct macb_config pc302gem_config = {
- .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE,
- .dma_burst_length = 16,
- .clk_init = macb_clk_init,
- .init = macb_init,
-};
-
-static const struct macb_config sama5d2_config = {
- .caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
- .dma_burst_length = 16,
- .clk_init = macb_clk_init,
- .init = macb_init,
-};
-
-static const struct macb_config sama5d3_config = {
- .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE
- | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
- .dma_burst_length = 16,
- .clk_init = macb_clk_init,
- .init = macb_init,
-};
-
-static const struct macb_config sama5d4_config = {
- .caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
- .dma_burst_length = 4,
- .clk_init = macb_clk_init,
- .init = macb_init,
-};
-
-static const struct macb_config emac_config = {
- .clk_init = at91ether_clk_init,
- .init = at91ether_init,
-};
-
-static const struct macb_config np4_config = {
- .caps = MACB_CAPS_USRIO_DISABLED,
- .clk_init = macb_clk_init,
- .init = macb_init,
-};
-
-static const struct macb_config zynqmp_config = {
- .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO,
- .dma_burst_length = 16,
- .clk_init = macb_clk_init,
- .init = macb_init,
- .jumbo_max_len = 10240,
-};
-
-static const struct macb_config zynq_config = {
- .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_NO_GIGABIT_HALF,
- .dma_burst_length = 16,
- .clk_init = macb_clk_init,
- .init = macb_init,
-};
-
-static const struct of_device_id macb_dt_ids[] = {
- { .compatible = "cdns,at32ap7000-macb" },
- { .compatible = "cdns,at91sam9260-macb", .data = &at91sam9260_config },
- { .compatible = "cdns,macb" },
- { .compatible = "cdns,np4-macb", .data = &np4_config },
- { .compatible = "cdns,pc302-gem", .data = &pc302gem_config },
- { .compatible = "cdns,gem", .data = &pc302gem_config },
- { .compatible = "atmel,sama5d2-gem", .data = &sama5d2_config },
- { .compatible = "atmel,sama5d3-gem", .data = &sama5d3_config },
- { .compatible = "atmel,sama5d4-gem", .data = &sama5d4_config },
- { .compatible = "cdns,at91rm9200-emac", .data = &emac_config },
- { .compatible = "cdns,emac", .data = &emac_config },
- { .compatible = "cdns,zynqmp-gem", .data = &zynqmp_config},
- { .compatible = "cdns,zynq-gem", .data = &zynq_config },
- { /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, macb_dt_ids);
-#endif /* CONFIG_OF */
-
-static const struct macb_config default_gem_config = {
- .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO,
- .dma_burst_length = 16,
- .clk_init = macb_clk_init,
- .init = macb_init,
- .jumbo_max_len = 10240,
-};
-
-static int macb_probe(struct platform_device *pdev)
-{
- const struct macb_config *macb_config = &default_gem_config;
- int (*clk_init)(struct platform_device *, struct clk **,
- struct clk **, struct clk **, struct clk **)
- = macb_config->clk_init;
- int (*init)(struct platform_device *) = macb_config->init;
- struct device_node *np = pdev->dev.of_node;
- struct device_node *phy_node;
- struct clk *pclk, *hclk = NULL, *tx_clk = NULL, *rx_clk = NULL;
- unsigned int queue_mask, num_queues;
- struct macb_platform_data *pdata;
- bool native_io;
- struct phy_device *phydev;
- struct net_device *dev;
- struct resource *regs;
- void __iomem *mem;
- const char *mac;
- struct macb *bp;
- int err;
-
- regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- mem = devm_ioremap_resource(&pdev->dev, regs);
- if (IS_ERR(mem))
- return PTR_ERR(mem);
-
- if (np) {
- const struct of_device_id *match;
-
- match = of_match_node(macb_dt_ids, np);
- if (match && match->data) {
- macb_config = match->data;
- clk_init = macb_config->clk_init;
- init = macb_config->init;
- }
- }
-
- err = clk_init(pdev, &pclk, &hclk, &tx_clk, &rx_clk);
- if (err)
- return err;
-
- native_io = hw_is_native_io(mem);
-
- macb_probe_queues(mem, native_io, &queue_mask, &num_queues);
- dev = alloc_etherdev_mq(sizeof(*bp), num_queues);
- if (!dev) {
- err = -ENOMEM;
- goto err_disable_clocks;
- }
-
- dev->base_addr = regs->start;
-
- SET_NETDEV_DEV(dev, &pdev->dev);
-
- bp = netdev_priv(dev);
- bp->pdev = pdev;
- bp->dev = dev;
- bp->regs = mem;
- bp->native_io = native_io;
- if (native_io) {
- bp->macb_reg_readl = hw_readl_native;
- bp->macb_reg_writel = hw_writel_native;
- } else {
- bp->macb_reg_readl = hw_readl;
- bp->macb_reg_writel = hw_writel;
- }
- bp->num_queues = num_queues;
- bp->queue_mask = queue_mask;
- if (macb_config)
- bp->dma_burst_length = macb_config->dma_burst_length;
- bp->pclk = pclk;
- bp->hclk = hclk;
- bp->tx_clk = tx_clk;
- bp->rx_clk = rx_clk;
- if (macb_config)
- bp->jumbo_max_len = macb_config->jumbo_max_len;
-
- bp->wol = 0;
- if (of_get_property(np, "magic-packet", NULL))
- bp->wol |= MACB_WOL_HAS_MAGIC_PACKET;
- device_init_wakeup(&pdev->dev, bp->wol & MACB_WOL_HAS_MAGIC_PACKET);
-
- spin_lock_init(&bp->lock);
-
- /* setup capabilities */
- macb_configure_caps(bp, macb_config);
-
-#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
- if (GEM_BFEXT(DAW64, gem_readl(bp, DCFG6))) {
- dma_set_mask(&pdev->dev, DMA_BIT_MASK(44));
- bp->hw_dma_cap |= HW_DMA_CAP_64B;
- }
-#endif
- platform_set_drvdata(pdev, dev);
-
- dev->irq = platform_get_irq(pdev, 0);
- if (dev->irq < 0) {
- err = dev->irq;
- goto err_out_free_netdev;
- }
-
- /* MTU range: 68 - 1500 or 10240 */
- dev->min_mtu = GEM_MTU_MIN_SIZE;
- if (bp->caps & MACB_CAPS_JUMBO)
- dev->max_mtu = gem_readl(bp, JML) - ETH_HLEN - ETH_FCS_LEN;
- else
- dev->max_mtu = ETH_DATA_LEN;
-
- mac = of_get_mac_address(np);
- if (mac)
- ether_addr_copy(bp->dev->dev_addr, mac);
- else
- macb_get_hwaddr(bp);
-
- /* Power up the PHY if there is a GPIO reset */
- phy_node = of_get_next_available_child(np, NULL);
- if (phy_node) {
- int gpio = of_get_named_gpio(phy_node, "reset-gpios", 0);
-
- if (gpio_is_valid(gpio)) {
- bp->reset_gpio = gpio_to_desc(gpio);
- gpiod_direction_output(bp->reset_gpio, 1);
- }
- }
- of_node_put(phy_node);
-
- err = of_get_phy_mode(np);
- if (err < 0) {
- pdata = dev_get_platdata(&pdev->dev);
- if (pdata && pdata->is_rmii)
- bp->phy_interface = PHY_INTERFACE_MODE_RMII;
- else
- bp->phy_interface = PHY_INTERFACE_MODE_MII;
- } else {
- bp->phy_interface = err;
- }
-
- /* IP specific init */
- err = init(pdev);
- if (err)
- goto err_out_free_netdev;
-
- err = macb_mii_init(bp);
- if (err)
- goto err_out_free_netdev;
-
- phydev = dev->phydev;
-
- netif_carrier_off(dev);
-
- err = register_netdev(dev);
- if (err) {
- dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
- goto err_out_unregister_mdio;
- }
-
- phy_attached_info(phydev);
-
- netdev_info(dev, "Cadence %s rev 0x%08x at 0x%08lx irq %d (%pM)\n",
- macb_is_gem(bp) ? "GEM" : "MACB", macb_readl(bp, MID),
- dev->base_addr, dev->irq, dev->dev_addr);
-
- return 0;
-
-err_out_unregister_mdio:
- phy_disconnect(dev->phydev);
- mdiobus_unregister(bp->mii_bus);
- mdiobus_free(bp->mii_bus);
-
- /* Shutdown the PHY if there is a GPIO reset */
- if (bp->reset_gpio)
- gpiod_set_value(bp->reset_gpio, 0);
-
-err_out_free_netdev:
- free_netdev(dev);
-
-err_disable_clocks:
- clk_disable_unprepare(tx_clk);
- clk_disable_unprepare(hclk);
- clk_disable_unprepare(pclk);
- clk_disable_unprepare(rx_clk);
-
- return err;
-}
-
-static int macb_remove(struct platform_device *pdev)
-{
- struct net_device *dev;
- struct macb *bp;
-
- dev = platform_get_drvdata(pdev);
-
- if (dev) {
- bp = netdev_priv(dev);
- if (dev->phydev)
- phy_disconnect(dev->phydev);
- mdiobus_unregister(bp->mii_bus);
- dev->phydev = NULL;
- mdiobus_free(bp->mii_bus);
-
- /* Shutdown the PHY if there is a GPIO reset */
- if (bp->reset_gpio)
- gpiod_set_value(bp->reset_gpio, 0);
-
- unregister_netdev(dev);
- clk_disable_unprepare(bp->tx_clk);
- clk_disable_unprepare(bp->hclk);
- clk_disable_unprepare(bp->pclk);
- clk_disable_unprepare(bp->rx_clk);
- of_node_put(bp->phy_node);
- free_netdev(dev);
- }
-
- return 0;
-}
-
-static int __maybe_unused macb_suspend(struct device *dev)
-{
- struct platform_device *pdev = to_platform_device(dev);
- struct net_device *netdev = platform_get_drvdata(pdev);
- struct macb *bp = netdev_priv(netdev);
-
- netif_carrier_off(netdev);
- netif_device_detach(netdev);
-
- if (bp->wol & MACB_WOL_ENABLED) {
- macb_writel(bp, IER, MACB_BIT(WOL));
- macb_writel(bp, WOL, MACB_BIT(MAG));
- enable_irq_wake(bp->queues[0].irq);
- } else {
- clk_disable_unprepare(bp->tx_clk);
- clk_disable_unprepare(bp->hclk);
- clk_disable_unprepare(bp->pclk);
- clk_disable_unprepare(bp->rx_clk);
- }
-
- return 0;
-}
-
-static int __maybe_unused macb_resume(struct device *dev)
-{
- struct platform_device *pdev = to_platform_device(dev);
- struct net_device *netdev = platform_get_drvdata(pdev);
- struct macb *bp = netdev_priv(netdev);
-
- if (bp->wol & MACB_WOL_ENABLED) {
- macb_writel(bp, IDR, MACB_BIT(WOL));
- macb_writel(bp, WOL, 0);
- disable_irq_wake(bp->queues[0].irq);
- } else {
- clk_prepare_enable(bp->pclk);
- clk_prepare_enable(bp->hclk);
- clk_prepare_enable(bp->tx_clk);
- clk_prepare_enable(bp->rx_clk);
- }
-
- netif_device_attach(netdev);
-
- return 0;
-}
-
-static SIMPLE_DEV_PM_OPS(macb_pm_ops, macb_suspend, macb_resume);
-
-static struct platform_driver macb_driver = {
- .probe = macb_probe,
- .remove = macb_remove,
- .driver = {
- .name = "macb",
- .of_match_table = of_match_ptr(macb_dt_ids),
- .pm = &macb_pm_ops,
- },
-};
-
-module_platform_driver(macb_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Cadence MACB/GEM Ethernet driver");
-MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
-MODULE_ALIAS("platform:macb");
--- /dev/null
+/*
+ * Cadence MACB/GEM Ethernet Controller driver
+ *
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/circ_buf.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/dma-mapping.h>
+#include <linux/platform_data/macb.h>
+#include <linux/platform_device.h>
+#include <linux/phy.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/of_mdio.h>
+#include <linux/of_net.h>
+#include <linux/ip.h>
+#include <linux/udp.h>
+#include <linux/tcp.h>
+#include "macb.h"
+
+#define MACB_RX_BUFFER_SIZE 128
+#define RX_BUFFER_MULTIPLE 64 /* bytes */
+
+#define DEFAULT_RX_RING_SIZE 512 /* must be power of 2 */
+#define MIN_RX_RING_SIZE 64
+#define MAX_RX_RING_SIZE 8192
+#define RX_RING_BYTES(bp) (macb_dma_desc_get_size(bp) \
+ * (bp)->rx_ring_size)
+
+#define DEFAULT_TX_RING_SIZE 512 /* must be power of 2 */
+#define MIN_TX_RING_SIZE 64
+#define MAX_TX_RING_SIZE 4096
+#define TX_RING_BYTES(bp) (macb_dma_desc_get_size(bp) \
+ * (bp)->tx_ring_size)
+
+/* level of occupied TX descriptors under which we wake up TX process */
+#define MACB_TX_WAKEUP_THRESH(bp) (3 * (bp)->tx_ring_size / 4)
+
+#define MACB_RX_INT_FLAGS (MACB_BIT(RCOMP) | MACB_BIT(RXUBR) \
+ | MACB_BIT(ISR_ROVR))
+#define MACB_TX_ERR_FLAGS (MACB_BIT(ISR_TUND) \
+ | MACB_BIT(ISR_RLE) \
+ | MACB_BIT(TXERR))
+#define MACB_TX_INT_FLAGS (MACB_TX_ERR_FLAGS | MACB_BIT(TCOMP))
+
+/* Max length of transmit frame must be a multiple of 8 bytes */
+#define MACB_TX_LEN_ALIGN 8
+#define MACB_MAX_TX_LEN ((unsigned int)((1 << MACB_TX_FRMLEN_SIZE) - 1) & ~((unsigned int)(MACB_TX_LEN_ALIGN - 1)))
+#define GEM_MAX_TX_LEN ((unsigned int)((1 << GEM_TX_FRMLEN_SIZE) - 1) & ~((unsigned int)(MACB_TX_LEN_ALIGN - 1)))
+
+#define GEM_MTU_MIN_SIZE ETH_MIN_MTU
+#define MACB_NETIF_LSO (NETIF_F_TSO | NETIF_F_UFO)
+
+#define MACB_WOL_HAS_MAGIC_PACKET (0x1 << 0)
+#define MACB_WOL_ENABLED (0x1 << 1)
+
+/* Graceful stop timeouts in us. We should allow up to
+ * 1 frame time (10 Mbits/s, full-duplex, ignoring collisions)
+ */
+#define MACB_HALT_TIMEOUT 1230
+
+/* DMA buffer descriptor might be different size
+ * depends on hardware configuration:
+ *
+ * 1. dma address width 32 bits:
+ * word 1: 32 bit address of Data Buffer
+ * word 2: control
+ *
+ * 2. dma address width 64 bits:
+ * word 1: 32 bit address of Data Buffer
+ * word 2: control
+ * word 3: upper 32 bit address of Data Buffer
+ * word 4: unused
+ *
+ * 3. dma address width 32 bits with hardware timestamping:
+ * word 1: 32 bit address of Data Buffer
+ * word 2: control
+ * word 3: timestamp word 1
+ * word 4: timestamp word 2
+ *
+ * 4. dma address width 64 bits with hardware timestamping:
+ * word 1: 32 bit address of Data Buffer
+ * word 2: control
+ * word 3: upper 32 bit address of Data Buffer
+ * word 4: unused
+ * word 5: timestamp word 1
+ * word 6: timestamp word 2
+ */
+static unsigned int macb_dma_desc_get_size(struct macb *bp)
+{
+#ifdef MACB_EXT_DESC
+ unsigned int desc_size;
+
+ switch (bp->hw_dma_cap) {
+ case HW_DMA_CAP_64B:
+ desc_size = sizeof(struct macb_dma_desc)
+ + sizeof(struct macb_dma_desc_64);
+ break;
+ case HW_DMA_CAP_PTP:
+ desc_size = sizeof(struct macb_dma_desc)
+ + sizeof(struct macb_dma_desc_ptp);
+ break;
+ case HW_DMA_CAP_64B_PTP:
+ desc_size = sizeof(struct macb_dma_desc)
+ + sizeof(struct macb_dma_desc_64)
+ + sizeof(struct macb_dma_desc_ptp);
+ break;
+ default:
+ desc_size = sizeof(struct macb_dma_desc);
+ }
+ return desc_size;
+#endif
+ return sizeof(struct macb_dma_desc);
+}
+
+static unsigned int macb_adj_dma_desc_idx(struct macb *bp, unsigned int desc_idx)
+{
+#ifdef MACB_EXT_DESC
+ switch (bp->hw_dma_cap) {
+ case HW_DMA_CAP_64B:
+ case HW_DMA_CAP_PTP:
+ desc_idx <<= 1;
+ break;
+ case HW_DMA_CAP_64B_PTP:
+ desc_idx *= 3;
+ break;
+ default:
+ break;
+ }
+ return desc_idx;
+#endif
+ return desc_idx;
+}
+
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+static struct macb_dma_desc_64 *macb_64b_desc(struct macb *bp, struct macb_dma_desc *desc)
+{
+ if (bp->hw_dma_cap & HW_DMA_CAP_64B)
+ return (struct macb_dma_desc_64 *)((void *)desc + sizeof(struct macb_dma_desc));
+ return NULL;
+}
+#endif
+
+/* Ring buffer accessors */
+static unsigned int macb_tx_ring_wrap(struct macb *bp, unsigned int index)
+{
+ return index & (bp->tx_ring_size - 1);
+}
+
+static struct macb_dma_desc *macb_tx_desc(struct macb_queue *queue,
+ unsigned int index)
+{
+ index = macb_tx_ring_wrap(queue->bp, index);
+ index = macb_adj_dma_desc_idx(queue->bp, index);
+ return &queue->tx_ring[index];
+}
+
+static struct macb_tx_skb *macb_tx_skb(struct macb_queue *queue,
+ unsigned int index)
+{
+ return &queue->tx_skb[macb_tx_ring_wrap(queue->bp, index)];
+}
+
+static dma_addr_t macb_tx_dma(struct macb_queue *queue, unsigned int index)
+{
+ dma_addr_t offset;
+
+ offset = macb_tx_ring_wrap(queue->bp, index) *
+ macb_dma_desc_get_size(queue->bp);
+
+ return queue->tx_ring_dma + offset;
+}
+
+static unsigned int macb_rx_ring_wrap(struct macb *bp, unsigned int index)
+{
+ return index & (bp->rx_ring_size - 1);
+}
+
+static struct macb_dma_desc *macb_rx_desc(struct macb *bp, unsigned int index)
+{
+ index = macb_rx_ring_wrap(bp, index);
+ index = macb_adj_dma_desc_idx(bp, index);
+ return &bp->rx_ring[index];
+}
+
+static void *macb_rx_buffer(struct macb *bp, unsigned int index)
+{
+ return bp->rx_buffers + bp->rx_buffer_size *
+ macb_rx_ring_wrap(bp, index);
+}
+
+/* I/O accessors */
+static u32 hw_readl_native(struct macb *bp, int offset)
+{
+ return __raw_readl(bp->regs + offset);
+}
+
+static void hw_writel_native(struct macb *bp, int offset, u32 value)
+{
+ __raw_writel(value, bp->regs + offset);
+}
+
+static u32 hw_readl(struct macb *bp, int offset)
+{
+ return readl_relaxed(bp->regs + offset);
+}
+
+static void hw_writel(struct macb *bp, int offset, u32 value)
+{
+ writel_relaxed(value, bp->regs + offset);
+}
+
+/* Find the CPU endianness by using the loopback bit of NCR register. When the
+ * CPU is in big endian we need to program swapped mode for management
+ * descriptor access.
+ */
+static bool hw_is_native_io(void __iomem *addr)
+{
+ u32 value = MACB_BIT(LLB);
+
+ __raw_writel(value, addr + MACB_NCR);
+ value = __raw_readl(addr + MACB_NCR);
+
+ /* Write 0 back to disable everything */
+ __raw_writel(0, addr + MACB_NCR);
+
+ return value == MACB_BIT(LLB);
+}
+
+static bool hw_is_gem(void __iomem *addr, bool native_io)
+{
+ u32 id;
+
+ if (native_io)
+ id = __raw_readl(addr + MACB_MID);
+ else
+ id = readl_relaxed(addr + MACB_MID);
+
+ return MACB_BFEXT(IDNUM, id) >= 0x2;
+}
+
+static void macb_set_hwaddr(struct macb *bp)
+{
+ u32 bottom;
+ u16 top;
+
+ bottom = cpu_to_le32(*((u32 *)bp->dev->dev_addr));
+ macb_or_gem_writel(bp, SA1B, bottom);
+ top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4)));
+ macb_or_gem_writel(bp, SA1T, top);
+
+ /* Clear unused address register sets */
+ macb_or_gem_writel(bp, SA2B, 0);
+ macb_or_gem_writel(bp, SA2T, 0);
+ macb_or_gem_writel(bp, SA3B, 0);
+ macb_or_gem_writel(bp, SA3T, 0);
+ macb_or_gem_writel(bp, SA4B, 0);
+ macb_or_gem_writel(bp, SA4T, 0);
+}
+
+static void macb_get_hwaddr(struct macb *bp)
+{
+ struct macb_platform_data *pdata;
+ u32 bottom;
+ u16 top;
+ u8 addr[6];
+ int i;
+
+ pdata = dev_get_platdata(&bp->pdev->dev);
+
+ /* Check all 4 address register for valid address */
+ for (i = 0; i < 4; i++) {
+ bottom = macb_or_gem_readl(bp, SA1B + i * 8);
+ top = macb_or_gem_readl(bp, SA1T + i * 8);
+
+ if (pdata && pdata->rev_eth_addr) {
+ addr[5] = bottom & 0xff;
+ addr[4] = (bottom >> 8) & 0xff;
+ addr[3] = (bottom >> 16) & 0xff;
+ addr[2] = (bottom >> 24) & 0xff;
+ addr[1] = top & 0xff;
+ addr[0] = (top & 0xff00) >> 8;
+ } else {
+ addr[0] = bottom & 0xff;
+ addr[1] = (bottom >> 8) & 0xff;
+ addr[2] = (bottom >> 16) & 0xff;
+ addr[3] = (bottom >> 24) & 0xff;
+ addr[4] = top & 0xff;
+ addr[5] = (top >> 8) & 0xff;
+ }
+
+ if (is_valid_ether_addr(addr)) {
+ memcpy(bp->dev->dev_addr, addr, sizeof(addr));
+ return;
+ }
+ }
+
+ dev_info(&bp->pdev->dev, "invalid hw address, using random\n");
+ eth_hw_addr_random(bp->dev);
+}
+
+static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
+{
+ struct macb *bp = bus->priv;
+ int value;
+
+ macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
+ | MACB_BF(RW, MACB_MAN_READ)
+ | MACB_BF(PHYA, mii_id)
+ | MACB_BF(REGA, regnum)
+ | MACB_BF(CODE, MACB_MAN_CODE)));
+
+ /* wait for end of transfer */
+ while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
+ cpu_relax();
+
+ value = MACB_BFEXT(DATA, macb_readl(bp, MAN));
+
+ return value;
+}
+
+static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
+ u16 value)
+{
+ struct macb *bp = bus->priv;
+
+ macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF)
+ | MACB_BF(RW, MACB_MAN_WRITE)
+ | MACB_BF(PHYA, mii_id)
+ | MACB_BF(REGA, regnum)
+ | MACB_BF(CODE, MACB_MAN_CODE)
+ | MACB_BF(DATA, value)));
+
+ /* wait for end of transfer */
+ while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR)))
+ cpu_relax();
+
+ return 0;
+}
+
+/**
+ * macb_set_tx_clk() - Set a clock to a new frequency
+ * @clk Pointer to the clock to change
+ * @rate New frequency in Hz
+ * @dev Pointer to the struct net_device
+ */
+static void macb_set_tx_clk(struct clk *clk, int speed, struct net_device *dev)
+{
+ long ferr, rate, rate_rounded;
+
+ if (!clk)
+ return;
+
+ switch (speed) {
+ case SPEED_10:
+ rate = 2500000;
+ break;
+ case SPEED_100:
+ rate = 25000000;
+ break;
+ case SPEED_1000:
+ rate = 125000000;
+ break;
+ default:
+ return;
+ }
+
+ rate_rounded = clk_round_rate(clk, rate);
+ if (rate_rounded < 0)
+ return;
+
+ /* RGMII allows 50 ppm frequency error. Test and warn if this limit
+ * is not satisfied.
+ */
+ ferr = abs(rate_rounded - rate);
+ ferr = DIV_ROUND_UP(ferr, rate / 100000);
+ if (ferr > 5)
+ netdev_warn(dev, "unable to generate target frequency: %ld Hz\n",
+ rate);
+
+ if (clk_set_rate(clk, rate_rounded))
+ netdev_err(dev, "adjusting tx_clk failed.\n");
+}
+
+static void macb_handle_link_change(struct net_device *dev)
+{
+ struct macb *bp = netdev_priv(dev);
+ struct phy_device *phydev = dev->phydev;
+ unsigned long flags;
+ int status_change = 0;
+
+ spin_lock_irqsave(&bp->lock, flags);
+
+ if (phydev->link) {
+ if ((bp->speed != phydev->speed) ||
+ (bp->duplex != phydev->duplex)) {
+ u32 reg;
+
+ reg = macb_readl(bp, NCFGR);
+ reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD));
+ if (macb_is_gem(bp))
+ reg &= ~GEM_BIT(GBE);
+
+ if (phydev->duplex)
+ reg |= MACB_BIT(FD);
+ if (phydev->speed == SPEED_100)
+ reg |= MACB_BIT(SPD);
+ if (phydev->speed == SPEED_1000 &&
+ bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE)
+ reg |= GEM_BIT(GBE);
+
+ macb_or_gem_writel(bp, NCFGR, reg);
+
+ bp->speed = phydev->speed;
+ bp->duplex = phydev->duplex;
+ status_change = 1;
+ }
+ }
+
+ if (phydev->link != bp->link) {
+ if (!phydev->link) {
+ bp->speed = 0;
+ bp->duplex = -1;
+ }
+ bp->link = phydev->link;
+
+ status_change = 1;
+ }
+
+ spin_unlock_irqrestore(&bp->lock, flags);
+
+ if (status_change) {
+ if (phydev->link) {
+ /* Update the TX clock rate if and only if the link is
+ * up and there has been a link change.
+ */
+ macb_set_tx_clk(bp->tx_clk, phydev->speed, dev);
+
+ netif_carrier_on(dev);
+ netdev_info(dev, "link up (%d/%s)\n",
+ phydev->speed,
+ phydev->duplex == DUPLEX_FULL ?
+ "Full" : "Half");
+ } else {
+ netif_carrier_off(dev);
+ netdev_info(dev, "link down\n");
+ }
+ }
+}
+
+/* based on au1000_eth. c*/
+static int macb_mii_probe(struct net_device *dev)
+{
+ struct macb *bp = netdev_priv(dev);
+ struct macb_platform_data *pdata;
+ struct phy_device *phydev;
+ int phy_irq;
+ int ret;
+
+ if (bp->phy_node) {
+ phydev = of_phy_connect(dev, bp->phy_node,
+ &macb_handle_link_change, 0,
+ bp->phy_interface);
+ if (!phydev)
+ return -ENODEV;
+ } else {
+ phydev = phy_find_first(bp->mii_bus);
+ if (!phydev) {
+ netdev_err(dev, "no PHY found\n");
+ return -ENXIO;
+ }
+
+ pdata = dev_get_platdata(&bp->pdev->dev);
+ if (pdata) {
+ if (gpio_is_valid(pdata->phy_irq_pin)) {
+ ret = devm_gpio_request(&bp->pdev->dev,
+ pdata->phy_irq_pin, "phy int");
+ if (!ret) {
+ phy_irq = gpio_to_irq(pdata->phy_irq_pin);
+ phydev->irq = (phy_irq < 0) ? PHY_POLL : phy_irq;
+ }
+ } else {
+ phydev->irq = PHY_POLL;
+ }
+ }
+
+ /* attach the mac to the phy */
+ ret = phy_connect_direct(dev, phydev, &macb_handle_link_change,
+ bp->phy_interface);
+ if (ret) {
+ netdev_err(dev, "Could not attach to PHY\n");
+ return ret;
+ }
+ }
+
+ /* mask with MAC supported features */
+ if (macb_is_gem(bp) && bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE)
+ phydev->supported &= PHY_GBIT_FEATURES;
+ else
+ phydev->supported &= PHY_BASIC_FEATURES;
+
+ if (bp->caps & MACB_CAPS_NO_GIGABIT_HALF)
+ phydev->supported &= ~SUPPORTED_1000baseT_Half;
+
+ phydev->advertising = phydev->supported;
+
+ bp->link = 0;
+ bp->speed = 0;
+ bp->duplex = -1;
+
+ return 0;
+}
+
+static int macb_mii_init(struct macb *bp)
+{
+ struct macb_platform_data *pdata;
+ struct device_node *np;
+ int err = -ENXIO, i;
+
+ /* Enable management port */
+ macb_writel(bp, NCR, MACB_BIT(MPE));
+
+ bp->mii_bus = mdiobus_alloc();
+ if (!bp->mii_bus) {
+ err = -ENOMEM;
+ goto err_out;
+ }
+
+ bp->mii_bus->name = "MACB_mii_bus";
+ bp->mii_bus->read = &macb_mdio_read;
+ bp->mii_bus->write = &macb_mdio_write;
+ snprintf(bp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
+ bp->pdev->name, bp->pdev->id);
+ bp->mii_bus->priv = bp;
+ bp->mii_bus->parent = &bp->pdev->dev;
+ pdata = dev_get_platdata(&bp->pdev->dev);
+
+ dev_set_drvdata(&bp->dev->dev, bp->mii_bus);
+
+ np = bp->pdev->dev.of_node;
+ if (np) {
+ if (of_phy_is_fixed_link(np)) {
+ if (of_phy_register_fixed_link(np) < 0) {
+ dev_err(&bp->pdev->dev,
+ "broken fixed-link specification\n");
+ goto err_out_unregister_bus;
+ }
+ bp->phy_node = of_node_get(np);
+
+ err = mdiobus_register(bp->mii_bus);
+ } else {
+ /* try dt phy registration */
+ err = of_mdiobus_register(bp->mii_bus, np);
+
+ /* fallback to standard phy registration if no phy were
+ * found during dt phy registration
+ */
+ if (!err && !phy_find_first(bp->mii_bus)) {
+ for (i = 0; i < PHY_MAX_ADDR; i++) {
+ struct phy_device *phydev;
+
+ phydev = mdiobus_scan(bp->mii_bus, i);
+ if (IS_ERR(phydev) &&
+ PTR_ERR(phydev) != -ENODEV) {
+ err = PTR_ERR(phydev);
+ break;
+ }
+ }
+
+ if (err)
+ goto err_out_unregister_bus;
+ }
+ }
+ } else {
+ for (i = 0; i < PHY_MAX_ADDR; i++)
+ bp->mii_bus->irq[i] = PHY_POLL;
+
+ if (pdata)
+ bp->mii_bus->phy_mask = pdata->phy_mask;
+
+ err = mdiobus_register(bp->mii_bus);
+ }
+
+ if (err)
+ goto err_out_free_mdiobus;
+
+ err = macb_mii_probe(bp->dev);
+ if (err)
+ goto err_out_unregister_bus;
+
+ return 0;
+
+err_out_unregister_bus:
+ mdiobus_unregister(bp->mii_bus);
+err_out_free_mdiobus:
+ mdiobus_free(bp->mii_bus);
+err_out:
+ return err;
+}
+
+static void macb_update_stats(struct macb *bp)
+{
+ u32 *p = &bp->hw_stats.macb.rx_pause_frames;
+ u32 *end = &bp->hw_stats.macb.tx_pause_frames + 1;
+ int offset = MACB_PFR;
+
+ WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4);
+
+ for (; p < end; p++, offset += 4)
+ *p += bp->macb_reg_readl(bp, offset);
+}
+
+static int macb_halt_tx(struct macb *bp)
+{
+ unsigned long halt_time, timeout;
+ u32 status;
+
+ macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(THALT));
+
+ timeout = jiffies + usecs_to_jiffies(MACB_HALT_TIMEOUT);
+ do {
+ halt_time = jiffies;
+ status = macb_readl(bp, TSR);
+ if (!(status & MACB_BIT(TGO)))
+ return 0;
+
+ usleep_range(10, 250);
+ } while (time_before(halt_time, timeout));
+
+ return -ETIMEDOUT;
+}
+
+static void macb_tx_unmap(struct macb *bp, struct macb_tx_skb *tx_skb)
+{
+ if (tx_skb->mapping) {
+ if (tx_skb->mapped_as_page)
+ dma_unmap_page(&bp->pdev->dev, tx_skb->mapping,
+ tx_skb->size, DMA_TO_DEVICE);
+ else
+ dma_unmap_single(&bp->pdev->dev, tx_skb->mapping,
+ tx_skb->size, DMA_TO_DEVICE);
+ tx_skb->mapping = 0;
+ }
+
+ if (tx_skb->skb) {
+ dev_kfree_skb_any(tx_skb->skb);
+ tx_skb->skb = NULL;
+ }
+}
+
+static void macb_set_addr(struct macb *bp, struct macb_dma_desc *desc, dma_addr_t addr)
+{
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+ struct macb_dma_desc_64 *desc_64;
+
+ if (bp->hw_dma_cap & HW_DMA_CAP_64B) {
+ desc_64 = macb_64b_desc(bp, desc);
+ desc_64->addrh = upper_32_bits(addr);
+ }
+#endif
+ desc->addr = lower_32_bits(addr);
+}
+
+static dma_addr_t macb_get_addr(struct macb *bp, struct macb_dma_desc *desc)
+{
+ dma_addr_t addr = 0;
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+ struct macb_dma_desc_64 *desc_64;
+
+ if (bp->hw_dma_cap & HW_DMA_CAP_64B) {
+ desc_64 = macb_64b_desc(bp, desc);
+ addr = ((u64)(desc_64->addrh) << 32);
+ }
+#endif
+ addr |= MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, desc->addr));
+ return addr;
+}
+
+static void macb_tx_error_task(struct work_struct *work)
+{
+ struct macb_queue *queue = container_of(work, struct macb_queue,
+ tx_error_task);
+ struct macb *bp = queue->bp;
+ struct macb_tx_skb *tx_skb;
+ struct macb_dma_desc *desc;
+ struct sk_buff *skb;
+ unsigned int tail;
+ unsigned long flags;
+
+ netdev_vdbg(bp->dev, "macb_tx_error_task: q = %u, t = %u, h = %u\n",
+ (unsigned int)(queue - bp->queues),
+ queue->tx_tail, queue->tx_head);
+
+ /* Prevent the queue IRQ handlers from running: each of them may call
+ * macb_tx_interrupt(), which in turn may call netif_wake_subqueue().
+ * As explained below, we have to halt the transmission before updating
+ * TBQP registers so we call netif_tx_stop_all_queues() to notify the
+ * network engine about the macb/gem being halted.
+ */
+ spin_lock_irqsave(&bp->lock, flags);
+
+ /* Make sure nobody is trying to queue up new packets */
+ netif_tx_stop_all_queues(bp->dev);
+
+ /* Stop transmission now
+ * (in case we have just queued new packets)
+ * macb/gem must be halted to write TBQP register
+ */
+ if (macb_halt_tx(bp))
+ /* Just complain for now, reinitializing TX path can be good */
+ netdev_err(bp->dev, "BUG: halt tx timed out\n");
+
+ /* Treat frames in TX queue including the ones that caused the error.
+ * Free transmit buffers in upper layer.
+ */
+ for (tail = queue->tx_tail; tail != queue->tx_head; tail++) {
+ u32 ctrl;
+
+ desc = macb_tx_desc(queue, tail);
+ ctrl = desc->ctrl;
+ tx_skb = macb_tx_skb(queue, tail);
+ skb = tx_skb->skb;
+
+ if (ctrl & MACB_BIT(TX_USED)) {
+ /* skb is set for the last buffer of the frame */
+ while (!skb) {
+ macb_tx_unmap(bp, tx_skb);
+ tail++;
+ tx_skb = macb_tx_skb(queue, tail);
+ skb = tx_skb->skb;
+ }
+
+ /* ctrl still refers to the first buffer descriptor
+ * since it's the only one written back by the hardware
+ */
+ if (!(ctrl & MACB_BIT(TX_BUF_EXHAUSTED))) {
+ netdev_vdbg(bp->dev, "txerr skb %u (data %p) TX complete\n",
+ macb_tx_ring_wrap(bp, tail),
+ skb->data);
+ bp->dev->stats.tx_packets++;
+ bp->dev->stats.tx_bytes += skb->len;
+ }
+ } else {
+ /* "Buffers exhausted mid-frame" errors may only happen
+ * if the driver is buggy, so complain loudly about
+ * those. Statistics are updated by hardware.
+ */
+ if (ctrl & MACB_BIT(TX_BUF_EXHAUSTED))
+ netdev_err(bp->dev,
+ "BUG: TX buffers exhausted mid-frame\n");
+
+ desc->ctrl = ctrl | MACB_BIT(TX_USED);
+ }
+
+ macb_tx_unmap(bp, tx_skb);
+ }
+
+ /* Set end of TX queue */
+ desc = macb_tx_desc(queue, 0);
+ macb_set_addr(bp, desc, 0);
+ desc->ctrl = MACB_BIT(TX_USED);
+
+ /* Make descriptor updates visible to hardware */
+ wmb();
+
+ /* Reinitialize the TX desc queue */
+ queue_writel(queue, TBQP, lower_32_bits(queue->tx_ring_dma));
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+ if (bp->hw_dma_cap & HW_DMA_CAP_64B)
+ queue_writel(queue, TBQPH, upper_32_bits(queue->tx_ring_dma));
+#endif
+ /* Make TX ring reflect state of hardware */
+ queue->tx_head = 0;
+ queue->tx_tail = 0;
+
+ /* Housework before enabling TX IRQ */
+ macb_writel(bp, TSR, macb_readl(bp, TSR));
+ queue_writel(queue, IER, MACB_TX_INT_FLAGS);
+
+ /* Now we are ready to start transmission again */
+ netif_tx_start_all_queues(bp->dev);
+ macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
+
+ spin_unlock_irqrestore(&bp->lock, flags);
+}
+
+static void macb_tx_interrupt(struct macb_queue *queue)
+{
+ unsigned int tail;
+ unsigned int head;
+ u32 status;
+ struct macb *bp = queue->bp;
+ u16 queue_index = queue - bp->queues;
+
+ status = macb_readl(bp, TSR);
+ macb_writel(bp, TSR, status);
+
+ if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+ queue_writel(queue, ISR, MACB_BIT(TCOMP));
+
+ netdev_vdbg(bp->dev, "macb_tx_interrupt status = 0x%03lx\n",
+ (unsigned long)status);
+
+ head = queue->tx_head;
+ for (tail = queue->tx_tail; tail != head; tail++) {
+ struct macb_tx_skb *tx_skb;
+ struct sk_buff *skb;
+ struct macb_dma_desc *desc;
+ u32 ctrl;
+
+ desc = macb_tx_desc(queue, tail);
+
+ /* Make hw descriptor updates visible to CPU */
+ rmb();
+
+ ctrl = desc->ctrl;
+
+ /* TX_USED bit is only set by hardware on the very first buffer
+ * descriptor of the transmitted frame.
+ */
+ if (!(ctrl & MACB_BIT(TX_USED)))
+ break;
+
+ /* Process all buffers of the current transmitted frame */
+ for (;; tail++) {
+ tx_skb = macb_tx_skb(queue, tail);
+ skb = tx_skb->skb;
+
+ /* First, update TX stats if needed */
+ if (skb) {
+ netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n",
+ macb_tx_ring_wrap(bp, tail),
+ skb->data);
+ bp->dev->stats.tx_packets++;
+ bp->dev->stats.tx_bytes += skb->len;
+ }
+
+ /* Now we can safely release resources */
+ macb_tx_unmap(bp, tx_skb);
+
+ /* skb is set only for the last buffer of the frame.
+ * WARNING: at this point skb has been freed by
+ * macb_tx_unmap().
+ */
+ if (skb)
+ break;
+ }
+ }
+
+ queue->tx_tail = tail;
+ if (__netif_subqueue_stopped(bp->dev, queue_index) &&
+ CIRC_CNT(queue->tx_head, queue->tx_tail,
+ bp->tx_ring_size) <= MACB_TX_WAKEUP_THRESH(bp))
+ netif_wake_subqueue(bp->dev, queue_index);
+}
+
+static void gem_rx_refill(struct macb *bp)
+{
+ unsigned int entry;
+ struct sk_buff *skb;
+ dma_addr_t paddr;
+ struct macb_dma_desc *desc;
+
+ while (CIRC_SPACE(bp->rx_prepared_head, bp->rx_tail,
+ bp->rx_ring_size) > 0) {
+ entry = macb_rx_ring_wrap(bp, bp->rx_prepared_head);
+
+ /* Make hw descriptor updates visible to CPU */
+ rmb();
+
+ bp->rx_prepared_head++;
+ desc = macb_rx_desc(bp, entry);
+
+ if (!bp->rx_skbuff[entry]) {
+ /* allocate sk_buff for this free entry in ring */
+ skb = netdev_alloc_skb(bp->dev, bp->rx_buffer_size);
+ if (unlikely(!skb)) {
+ netdev_err(bp->dev,
+ "Unable to allocate sk_buff\n");
+ break;
+ }
+
+ /* now fill corresponding descriptor entry */
+ paddr = dma_map_single(&bp->pdev->dev, skb->data,
+ bp->rx_buffer_size,
+ DMA_FROM_DEVICE);
+ if (dma_mapping_error(&bp->pdev->dev, paddr)) {
+ dev_kfree_skb(skb);
+ break;
+ }
+
+ bp->rx_skbuff[entry] = skb;
+
+ if (entry == bp->rx_ring_size - 1)
+ paddr |= MACB_BIT(RX_WRAP);
+ macb_set_addr(bp, desc, paddr);
+ desc->ctrl = 0;
+
+ /* properly align Ethernet header */
+ skb_reserve(skb, NET_IP_ALIGN);
+ } else {
+ desc->addr &= ~MACB_BIT(RX_USED);
+ desc->ctrl = 0;
+ }
+ }
+
+ /* Make descriptor updates visible to hardware */
+ wmb();
+
+ netdev_vdbg(bp->dev, "rx ring: prepared head %d, tail %d\n",
+ bp->rx_prepared_head, bp->rx_tail);
+}
+
+/* Mark DMA descriptors from begin up to and not including end as unused */
+static void discard_partial_frame(struct macb *bp, unsigned int begin,
+ unsigned int end)
+{
+ unsigned int frag;
+
+ for (frag = begin; frag != end; frag++) {
+ struct macb_dma_desc *desc = macb_rx_desc(bp, frag);
+
+ desc->addr &= ~MACB_BIT(RX_USED);
+ }
+
+ /* Make descriptor updates visible to hardware */
+ wmb();
+
+ /* When this happens, the hardware stats registers for
+ * whatever caused this is updated, so we don't have to record
+ * anything.
+ */
+}
+
+static int gem_rx(struct macb *bp, int budget)
+{
+ unsigned int len;
+ unsigned int entry;
+ struct sk_buff *skb;
+ struct macb_dma_desc *desc;
+ int count = 0;
+
+ while (count < budget) {
+ u32 ctrl;
+ dma_addr_t addr;
+ bool rxused;
+
+ entry = macb_rx_ring_wrap(bp, bp->rx_tail);
+ desc = macb_rx_desc(bp, entry);
+
+ /* Make hw descriptor updates visible to CPU */
+ rmb();
+
+ rxused = (desc->addr & MACB_BIT(RX_USED)) ? true : false;
+ addr = macb_get_addr(bp, desc);
+ ctrl = desc->ctrl;
+
+ if (!rxused)
+ break;
+
+ bp->rx_tail++;
+ count++;
+
+ if (!(ctrl & MACB_BIT(RX_SOF) && ctrl & MACB_BIT(RX_EOF))) {
+ netdev_err(bp->dev,
+ "not whole frame pointed by descriptor\n");
+ bp->dev->stats.rx_dropped++;
+ break;
+ }
+ skb = bp->rx_skbuff[entry];
+ if (unlikely(!skb)) {
+ netdev_err(bp->dev,
+ "inconsistent Rx descriptor chain\n");
+ bp->dev->stats.rx_dropped++;
+ break;
+ }
+ /* now everything is ready for receiving packet */
+ bp->rx_skbuff[entry] = NULL;
+ len = ctrl & bp->rx_frm_len_mask;
+
+ netdev_vdbg(bp->dev, "gem_rx %u (len %u)\n", entry, len);
+
+ skb_put(skb, len);
+ dma_unmap_single(&bp->pdev->dev, addr,
+ bp->rx_buffer_size, DMA_FROM_DEVICE);
+
+ skb->protocol = eth_type_trans(skb, bp->dev);
+ skb_checksum_none_assert(skb);
+ if (bp->dev->features & NETIF_F_RXCSUM &&
+ !(bp->dev->flags & IFF_PROMISC) &&
+ GEM_BFEXT(RX_CSUM, ctrl) & GEM_RX_CSUM_CHECKED_MASK)
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+ bp->dev->stats.rx_packets++;
+ bp->dev->stats.rx_bytes += skb->len;
+
+#if defined(DEBUG) && defined(VERBOSE_DEBUG)
+ netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
+ skb->len, skb->csum);
+ print_hex_dump(KERN_DEBUG, " mac: ", DUMP_PREFIX_ADDRESS, 16, 1,
+ skb_mac_header(skb), 16, true);
+ print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_ADDRESS, 16, 1,
+ skb->data, 32, true);
+#endif
+
+ netif_receive_skb(skb);
+ }
+
+ gem_rx_refill(bp);
+
+ return count;
+}
+
+static int macb_rx_frame(struct macb *bp, unsigned int first_frag,
+ unsigned int last_frag)
+{
+ unsigned int len;
+ unsigned int frag;
+ unsigned int offset;
+ struct sk_buff *skb;
+ struct macb_dma_desc *desc;
+
+ desc = macb_rx_desc(bp, last_frag);
+ len = desc->ctrl & bp->rx_frm_len_mask;
+
+ netdev_vdbg(bp->dev, "macb_rx_frame frags %u - %u (len %u)\n",
+ macb_rx_ring_wrap(bp, first_frag),
+ macb_rx_ring_wrap(bp, last_frag), len);
+
+ /* The ethernet header starts NET_IP_ALIGN bytes into the
+ * first buffer. Since the header is 14 bytes, this makes the
+ * payload word-aligned.
+ *
+ * Instead of calling skb_reserve(NET_IP_ALIGN), we just copy
+ * the two padding bytes into the skb so that we avoid hitting
+ * the slowpath in memcpy(), and pull them off afterwards.
+ */
+ skb = netdev_alloc_skb(bp->dev, len + NET_IP_ALIGN);
+ if (!skb) {
+ bp->dev->stats.rx_dropped++;
+ for (frag = first_frag; ; frag++) {
+ desc = macb_rx_desc(bp, frag);
+ desc->addr &= ~MACB_BIT(RX_USED);
+ if (frag == last_frag)
+ break;
+ }
+
+ /* Make descriptor updates visible to hardware */
+ wmb();
+
+ return 1;
+ }
+
+ offset = 0;
+ len += NET_IP_ALIGN;
+ skb_checksum_none_assert(skb);
+ skb_put(skb, len);
+
+ for (frag = first_frag; ; frag++) {
+ unsigned int frag_len = bp->rx_buffer_size;
+
+ if (offset + frag_len > len) {
+ if (unlikely(frag != last_frag)) {
+ dev_kfree_skb_any(skb);
+ return -1;
+ }
+ frag_len = len - offset;
+ }
+ skb_copy_to_linear_data_offset(skb, offset,
+ macb_rx_buffer(bp, frag),
+ frag_len);
+ offset += bp->rx_buffer_size;
+ desc = macb_rx_desc(bp, frag);
+ desc->addr &= ~MACB_BIT(RX_USED);
+
+ if (frag == last_frag)
+ break;
+ }
+
+ /* Make descriptor updates visible to hardware */
+ wmb();
+
+ __skb_pull(skb, NET_IP_ALIGN);
+ skb->protocol = eth_type_trans(skb, bp->dev);
+
+ bp->dev->stats.rx_packets++;
+ bp->dev->stats.rx_bytes += skb->len;
+ netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
+ skb->len, skb->csum);
+ netif_receive_skb(skb);
+
+ return 0;
+}
+
+static inline void macb_init_rx_ring(struct macb *bp)
+{
+ dma_addr_t addr;
+ struct macb_dma_desc *desc = NULL;
+ int i;
+
+ addr = bp->rx_buffers_dma;
+ for (i = 0; i < bp->rx_ring_size; i++) {
+ desc = macb_rx_desc(bp, i);
+ macb_set_addr(bp, desc, addr);
+ desc->ctrl = 0;
+ addr += bp->rx_buffer_size;
+ }
+ desc->addr |= MACB_BIT(RX_WRAP);
+ bp->rx_tail = 0;
+}
+
+static int macb_rx(struct macb *bp, int budget)
+{
+ bool reset_rx_queue = false;
+ int received = 0;
+ unsigned int tail;
+ int first_frag = -1;
+
+ for (tail = bp->rx_tail; budget > 0; tail++) {
+ struct macb_dma_desc *desc = macb_rx_desc(bp, tail);
+ u32 ctrl;
+
+ /* Make hw descriptor updates visible to CPU */
+ rmb();
+
+ ctrl = desc->ctrl;
+
+ if (!(desc->addr & MACB_BIT(RX_USED)))
+ break;
+
+ if (ctrl & MACB_BIT(RX_SOF)) {
+ if (first_frag != -1)
+ discard_partial_frame(bp, first_frag, tail);
+ first_frag = tail;
+ }
+
+ if (ctrl & MACB_BIT(RX_EOF)) {
+ int dropped;
+
+ if (unlikely(first_frag == -1)) {
+ reset_rx_queue = true;
+ continue;
+ }
+
+ dropped = macb_rx_frame(bp, first_frag, tail);
+ first_frag = -1;
+ if (unlikely(dropped < 0)) {
+ reset_rx_queue = true;
+ continue;
+ }
+ if (!dropped) {
+ received++;
+ budget--;
+ }
+ }
+ }
+
+ if (unlikely(reset_rx_queue)) {
+ unsigned long flags;
+ u32 ctrl;
+
+ netdev_err(bp->dev, "RX queue corruption: reset it\n");
+
+ spin_lock_irqsave(&bp->lock, flags);
+
+ ctrl = macb_readl(bp, NCR);
+ macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE));
+
+ macb_init_rx_ring(bp);
+ macb_writel(bp, RBQP, bp->rx_ring_dma);
+
+ macb_writel(bp, NCR, ctrl | MACB_BIT(RE));
+
+ spin_unlock_irqrestore(&bp->lock, flags);
+ return received;
+ }
+
+ if (first_frag != -1)
+ bp->rx_tail = first_frag;
+ else
+ bp->rx_tail = tail;
+
+ return received;
+}
+
+static int macb_poll(struct napi_struct *napi, int budget)
+{
+ struct macb *bp = container_of(napi, struct macb, napi);
+ int work_done;
+ u32 status;
+
+ status = macb_readl(bp, RSR);
+ macb_writel(bp, RSR, status);
+
+ work_done = 0;
+
+ netdev_vdbg(bp->dev, "poll: status = %08lx, budget = %d\n",
+ (unsigned long)status, budget);
+
+ work_done = bp->macbgem_ops.mog_rx(bp, budget);
+ if (work_done < budget) {
+ napi_complete_done(napi, work_done);
+
+ /* Packets received while interrupts were disabled */
+ status = macb_readl(bp, RSR);
+ if (status) {
+ if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+ macb_writel(bp, ISR, MACB_BIT(RCOMP));
+ napi_reschedule(napi);
+ } else {
+ macb_writel(bp, IER, MACB_RX_INT_FLAGS);
+ }
+ }
+
+ /* TODO: Handle errors */
+
+ return work_done;
+}
+
+static irqreturn_t macb_interrupt(int irq, void *dev_id)
+{
+ struct macb_queue *queue = dev_id;
+ struct macb *bp = queue->bp;
+ struct net_device *dev = bp->dev;
+ u32 status, ctrl;
+
+ status = queue_readl(queue, ISR);
+
+ if (unlikely(!status))
+ return IRQ_NONE;
+
+ spin_lock(&bp->lock);
+
+ while (status) {
+ /* close possible race with dev_close */
+ if (unlikely(!netif_running(dev))) {
+ queue_writel(queue, IDR, -1);
+ if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+ queue_writel(queue, ISR, -1);
+ break;
+ }
+
+ netdev_vdbg(bp->dev, "queue = %u, isr = 0x%08lx\n",
+ (unsigned int)(queue - bp->queues),
+ (unsigned long)status);
+
+ if (status & MACB_RX_INT_FLAGS) {
+ /* There's no point taking any more interrupts
+ * until we have processed the buffers. The
+ * scheduling call may fail if the poll routine
+ * is already scheduled, so disable interrupts
+ * now.
+ */
+ queue_writel(queue, IDR, MACB_RX_INT_FLAGS);
+ if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+ queue_writel(queue, ISR, MACB_BIT(RCOMP));
+
+ if (napi_schedule_prep(&bp->napi)) {
+ netdev_vdbg(bp->dev, "scheduling RX softirq\n");
+ __napi_schedule(&bp->napi);
+ }
+ }
+
+ if (unlikely(status & (MACB_TX_ERR_FLAGS))) {
+ queue_writel(queue, IDR, MACB_TX_INT_FLAGS);
+ schedule_work(&queue->tx_error_task);
+
+ if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+ queue_writel(queue, ISR, MACB_TX_ERR_FLAGS);
+
+ break;
+ }
+
+ if (status & MACB_BIT(TCOMP))
+ macb_tx_interrupt(queue);
+
+ /* Link change detection isn't possible with RMII, so we'll
+ * add that if/when we get our hands on a full-blown MII PHY.
+ */
+
+ /* There is a hardware issue under heavy load where DMA can
+ * stop, this causes endless "used buffer descriptor read"
+ * interrupts but it can be cleared by re-enabling RX. See
+ * the at91 manual, section 41.3.1 or the Zynq manual
+ * section 16.7.4 for details.
+ */
+ if (status & MACB_BIT(RXUBR)) {
+ ctrl = macb_readl(bp, NCR);
+ macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE));
+ wmb();
+ macb_writel(bp, NCR, ctrl | MACB_BIT(RE));
+
+ if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+ queue_writel(queue, ISR, MACB_BIT(RXUBR));
+ }
+
+ if (status & MACB_BIT(ISR_ROVR)) {
+ /* We missed at least one packet */
+ if (macb_is_gem(bp))
+ bp->hw_stats.gem.rx_overruns++;
+ else
+ bp->hw_stats.macb.rx_overruns++;
+
+ if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+ queue_writel(queue, ISR, MACB_BIT(ISR_ROVR));
+ }
+
+ if (status & MACB_BIT(HRESP)) {
+ /* TODO: Reset the hardware, and maybe move the
+ * netdev_err to a lower-priority context as well
+ * (work queue?)
+ */
+ netdev_err(dev, "DMA bus error: HRESP not OK\n");
+
+ if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+ queue_writel(queue, ISR, MACB_BIT(HRESP));
+ }
+
+ status = queue_readl(queue, ISR);
+ }
+
+ spin_unlock(&bp->lock);
+
+ return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/* Polling receive - used by netconsole and other diagnostic tools
+ * to allow network i/o with interrupts disabled.
+ */
+static void macb_poll_controller(struct net_device *dev)
+{
+ struct macb *bp = netdev_priv(dev);
+ struct macb_queue *queue;
+ unsigned long flags;
+ unsigned int q;
+
+ local_irq_save(flags);
+ for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue)
+ macb_interrupt(dev->irq, queue);
+ local_irq_restore(flags);
+}
+#endif
+
+static unsigned int macb_tx_map(struct macb *bp,
+ struct macb_queue *queue,
+ struct sk_buff *skb,
+ unsigned int hdrlen)
+{
+ dma_addr_t mapping;
+ unsigned int len, entry, i, tx_head = queue->tx_head;
+ struct macb_tx_skb *tx_skb = NULL;
+ struct macb_dma_desc *desc;
+ unsigned int offset, size, count = 0;
+ unsigned int f, nr_frags = skb_shinfo(skb)->nr_frags;
+ unsigned int eof = 1, mss_mfs = 0;
+ u32 ctrl, lso_ctrl = 0, seq_ctrl = 0;
+
+ /* LSO */
+ if (skb_shinfo(skb)->gso_size != 0) {
+ if (ip_hdr(skb)->protocol == IPPROTO_UDP)
+ /* UDP - UFO */
+ lso_ctrl = MACB_LSO_UFO_ENABLE;
+ else
+ /* TCP - TSO */
+ lso_ctrl = MACB_LSO_TSO_ENABLE;
+ }
+
+ /* First, map non-paged data */
+ len = skb_headlen(skb);
+
+ /* first buffer length */
+ size = hdrlen;
+
+ offset = 0;
+ while (len) {
+ entry = macb_tx_ring_wrap(bp, tx_head);
+ tx_skb = &queue->tx_skb[entry];
+
+ mapping = dma_map_single(&bp->pdev->dev,
+ skb->data + offset,
+ size, DMA_TO_DEVICE);
+ if (dma_mapping_error(&bp->pdev->dev, mapping))
+ goto dma_error;
+
+ /* Save info to properly release resources */
+ tx_skb->skb = NULL;
+ tx_skb->mapping = mapping;
+ tx_skb->size = size;
+ tx_skb->mapped_as_page = false;
+
+ len -= size;
+ offset += size;
+ count++;
+ tx_head++;
+
+ size = min(len, bp->max_tx_length);
+ }
+
+ /* Then, map paged data from fragments */
+ for (f = 0; f < nr_frags; f++) {
+ const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
+
+ len = skb_frag_size(frag);
+ offset = 0;
+ while (len) {
+ size = min(len, bp->max_tx_length);
+ entry = macb_tx_ring_wrap(bp, tx_head);
+ tx_skb = &queue->tx_skb[entry];
+
+ mapping = skb_frag_dma_map(&bp->pdev->dev, frag,
+ offset, size, DMA_TO_DEVICE);
+ if (dma_mapping_error(&bp->pdev->dev, mapping))
+ goto dma_error;
+
+ /* Save info to properly release resources */
+ tx_skb->skb = NULL;
+ tx_skb->mapping = mapping;
+ tx_skb->size = size;
+ tx_skb->mapped_as_page = true;
+
+ len -= size;
+ offset += size;
+ count++;
+ tx_head++;
+ }
+ }
+
+ /* Should never happen */
+ if (unlikely(!tx_skb)) {
+ netdev_err(bp->dev, "BUG! empty skb!\n");
+ return 0;
+ }
+
+ /* This is the last buffer of the frame: save socket buffer */
+ tx_skb->skb = skb;
+
+ /* Update TX ring: update buffer descriptors in reverse order
+ * to avoid race condition
+ */
+
+ /* Set 'TX_USED' bit in buffer descriptor at tx_head position
+ * to set the end of TX queue
+ */
+ i = tx_head;
+ entry = macb_tx_ring_wrap(bp, i);
+ ctrl = MACB_BIT(TX_USED);
+ desc = macb_tx_desc(queue, entry);
+ desc->ctrl = ctrl;
+
+ if (lso_ctrl) {
+ if (lso_ctrl == MACB_LSO_UFO_ENABLE)
+ /* include header and FCS in value given to h/w */
+ mss_mfs = skb_shinfo(skb)->gso_size +
+ skb_transport_offset(skb) +
+ ETH_FCS_LEN;
+ else /* TSO */ {
+ mss_mfs = skb_shinfo(skb)->gso_size;
+ /* TCP Sequence Number Source Select
+ * can be set only for TSO
+ */
+ seq_ctrl = 0;
+ }
+ }
+
+ do {
+ i--;
+ entry = macb_tx_ring_wrap(bp, i);
+ tx_skb = &queue->tx_skb[entry];
+ desc = macb_tx_desc(queue, entry);
+
+ ctrl = (u32)tx_skb->size;
+ if (eof) {
+ ctrl |= MACB_BIT(TX_LAST);
+ eof = 0;
+ }
+ if (unlikely(entry == (bp->tx_ring_size - 1)))
+ ctrl |= MACB_BIT(TX_WRAP);
+
+ /* First descriptor is header descriptor */
+ if (i == queue->tx_head) {
+ ctrl |= MACB_BF(TX_LSO, lso_ctrl);
+ ctrl |= MACB_BF(TX_TCP_SEQ_SRC, seq_ctrl);
+ } else
+ /* Only set MSS/MFS on payload descriptors
+ * (second or later descriptor)
+ */
+ ctrl |= MACB_BF(MSS_MFS, mss_mfs);
+
+ /* Set TX buffer descriptor */
+ macb_set_addr(bp, desc, tx_skb->mapping);
+ /* desc->addr must be visible to hardware before clearing
+ * 'TX_USED' bit in desc->ctrl.
+ */
+ wmb();
+ desc->ctrl = ctrl;
+ } while (i != queue->tx_head);
+
+ queue->tx_head = tx_head;
+
+ return count;
+
+dma_error:
+ netdev_err(bp->dev, "TX DMA map failed\n");
+
+ for (i = queue->tx_head; i != tx_head; i++) {
+ tx_skb = macb_tx_skb(queue, i);
+
+ macb_tx_unmap(bp, tx_skb);
+ }
+
+ return 0;
+}
+
+static netdev_features_t macb_features_check(struct sk_buff *skb,
+ struct net_device *dev,
+ netdev_features_t features)
+{
+ unsigned int nr_frags, f;
+ unsigned int hdrlen;
+
+ /* Validate LSO compatibility */
+
+ /* there is only one buffer */
+ if (!skb_is_nonlinear(skb))
+ return features;
+
+ /* length of header */
+ hdrlen = skb_transport_offset(skb);
+ if (ip_hdr(skb)->protocol == IPPROTO_TCP)
+ hdrlen += tcp_hdrlen(skb);
+
+ /* For LSO:
+ * When software supplies two or more payload buffers all payload buffers
+ * apart from the last must be a multiple of 8 bytes in size.
+ */
+ if (!IS_ALIGNED(skb_headlen(skb) - hdrlen, MACB_TX_LEN_ALIGN))
+ return features & ~MACB_NETIF_LSO;
+
+ nr_frags = skb_shinfo(skb)->nr_frags;
+ /* No need to check last fragment */
+ nr_frags--;
+ for (f = 0; f < nr_frags; f++) {
+ const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
+
+ if (!IS_ALIGNED(skb_frag_size(frag), MACB_TX_LEN_ALIGN))
+ return features & ~MACB_NETIF_LSO;
+ }
+ return features;
+}
+
+static inline int macb_clear_csum(struct sk_buff *skb)
+{
+ /* no change for packets without checksum offloading */
+ if (skb->ip_summed != CHECKSUM_PARTIAL)
+ return 0;
+
+ /* make sure we can modify the header */
+ if (unlikely(skb_cow_head(skb, 0)))
+ return -1;
+
+ /* initialize checksum field
+ * This is required - at least for Zynq, which otherwise calculates
+ * wrong UDP header checksums for UDP packets with UDP data len <=2
+ */
+ *(__sum16 *)(skb_checksum_start(skb) + skb->csum_offset) = 0;
+ return 0;
+}
+
+static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ u16 queue_index = skb_get_queue_mapping(skb);
+ struct macb *bp = netdev_priv(dev);
+ struct macb_queue *queue = &bp->queues[queue_index];
+ unsigned long flags;
+ unsigned int desc_cnt, nr_frags, frag_size, f;
+ unsigned int hdrlen;
+ bool is_lso, is_udp = 0;
+
+ is_lso = (skb_shinfo(skb)->gso_size != 0);
+
+ if (is_lso) {
+ is_udp = !!(ip_hdr(skb)->protocol == IPPROTO_UDP);
+
+ /* length of headers */
+ if (is_udp)
+ /* only queue eth + ip headers separately for UDP */
+ hdrlen = skb_transport_offset(skb);
+ else
+ hdrlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
+ if (skb_headlen(skb) < hdrlen) {
+ netdev_err(bp->dev, "Error - LSO headers fragmented!!!\n");
+ /* if this is required, would need to copy to single buffer */
+ return NETDEV_TX_BUSY;
+ }
+ } else
+ hdrlen = min(skb_headlen(skb), bp->max_tx_length);
+
+#if defined(DEBUG) && defined(VERBOSE_DEBUG)
+ netdev_vdbg(bp->dev,
+ "start_xmit: queue %hu len %u head %p data %p tail %p end %p\n",
+ queue_index, skb->len, skb->head, skb->data,
+ skb_tail_pointer(skb), skb_end_pointer(skb));
+ print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1,
+ skb->data, 16, true);
+#endif
+
+ /* Count how many TX buffer descriptors are needed to send this
+ * socket buffer: skb fragments of jumbo frames may need to be
+ * split into many buffer descriptors.
+ */
+ if (is_lso && (skb_headlen(skb) > hdrlen))
+ /* extra header descriptor if also payload in first buffer */
+ desc_cnt = DIV_ROUND_UP((skb_headlen(skb) - hdrlen), bp->max_tx_length) + 1;
+ else
+ desc_cnt = DIV_ROUND_UP(skb_headlen(skb), bp->max_tx_length);
+ nr_frags = skb_shinfo(skb)->nr_frags;
+ for (f = 0; f < nr_frags; f++) {
+ frag_size = skb_frag_size(&skb_shinfo(skb)->frags[f]);
+ desc_cnt += DIV_ROUND_UP(frag_size, bp->max_tx_length);
+ }
+
+ spin_lock_irqsave(&bp->lock, flags);
+
+ /* This is a hard error, log it. */
+ if (CIRC_SPACE(queue->tx_head, queue->tx_tail,
+ bp->tx_ring_size) < desc_cnt) {
+ netif_stop_subqueue(dev, queue_index);
+ spin_unlock_irqrestore(&bp->lock, flags);
+ netdev_dbg(bp->dev, "tx_head = %u, tx_tail = %u\n",
+ queue->tx_head, queue->tx_tail);
+ return NETDEV_TX_BUSY;
+ }
+
+ if (macb_clear_csum(skb)) {
+ dev_kfree_skb_any(skb);
+ goto unlock;
+ }
+
+ /* Map socket buffer for DMA transfer */
+ if (!macb_tx_map(bp, queue, skb, hdrlen)) {
+ dev_kfree_skb_any(skb);
+ goto unlock;
+ }
+
+ /* Make newly initialized descriptor visible to hardware */
+ wmb();
+
+ skb_tx_timestamp(skb);
+
+ macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
+
+ if (CIRC_SPACE(queue->tx_head, queue->tx_tail, bp->tx_ring_size) < 1)
+ netif_stop_subqueue(dev, queue_index);
+
+unlock:
+ spin_unlock_irqrestore(&bp->lock, flags);
+
+ return NETDEV_TX_OK;
+}
+
+static void macb_init_rx_buffer_size(struct macb *bp, size_t size)
+{
+ if (!macb_is_gem(bp)) {
+ bp->rx_buffer_size = MACB_RX_BUFFER_SIZE;
+ } else {
+ bp->rx_buffer_size = size;
+
+ if (bp->rx_buffer_size % RX_BUFFER_MULTIPLE) {
+ netdev_dbg(bp->dev,
+ "RX buffer must be multiple of %d bytes, expanding\n",
+ RX_BUFFER_MULTIPLE);
+ bp->rx_buffer_size =
+ roundup(bp->rx_buffer_size, RX_BUFFER_MULTIPLE);
+ }
+ }
+
+ netdev_dbg(bp->dev, "mtu [%u] rx_buffer_size [%zu]\n",
+ bp->dev->mtu, bp->rx_buffer_size);
+}
+
+static void gem_free_rx_buffers(struct macb *bp)
+{
+ struct sk_buff *skb;
+ struct macb_dma_desc *desc;
+ dma_addr_t addr;
+ int i;
+
+ if (!bp->rx_skbuff)
+ return;
+
+ for (i = 0; i < bp->rx_ring_size; i++) {
+ skb = bp->rx_skbuff[i];
+
+ if (!skb)
+ continue;
+
+ desc = macb_rx_desc(bp, i);
+ addr = macb_get_addr(bp, desc);
+
+ dma_unmap_single(&bp->pdev->dev, addr, bp->rx_buffer_size,
+ DMA_FROM_DEVICE);
+ dev_kfree_skb_any(skb);
+ skb = NULL;
+ }
+
+ kfree(bp->rx_skbuff);
+ bp->rx_skbuff = NULL;
+}
+
+static void macb_free_rx_buffers(struct macb *bp)
+{
+ if (bp->rx_buffers) {
+ dma_free_coherent(&bp->pdev->dev,
+ bp->rx_ring_size * bp->rx_buffer_size,
+ bp->rx_buffers, bp->rx_buffers_dma);
+ bp->rx_buffers = NULL;
+ }
+}
+
+static void macb_free_consistent(struct macb *bp)
+{
+ struct macb_queue *queue;
+ unsigned int q;
+
+ bp->macbgem_ops.mog_free_rx_buffers(bp);
+ if (bp->rx_ring) {
+ dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES(bp),
+ bp->rx_ring, bp->rx_ring_dma);
+ bp->rx_ring = NULL;
+ }
+
+ for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
+ kfree(queue->tx_skb);
+ queue->tx_skb = NULL;
+ if (queue->tx_ring) {
+ dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES(bp),
+ queue->tx_ring, queue->tx_ring_dma);
+ queue->tx_ring = NULL;
+ }
+ }
+}
+
+static int gem_alloc_rx_buffers(struct macb *bp)
+{
+ int size;
+
+ size = bp->rx_ring_size * sizeof(struct sk_buff *);
+ bp->rx_skbuff = kzalloc(size, GFP_KERNEL);
+ if (!bp->rx_skbuff)
+ return -ENOMEM;
+ else
+ netdev_dbg(bp->dev,
+ "Allocated %d RX struct sk_buff entries at %p\n",
+ bp->rx_ring_size, bp->rx_skbuff);
+ return 0;
+}
+
+static int macb_alloc_rx_buffers(struct macb *bp)
+{
+ int size;
+
+ size = bp->rx_ring_size * bp->rx_buffer_size;
+ bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size,
+ &bp->rx_buffers_dma, GFP_KERNEL);
+ if (!bp->rx_buffers)
+ return -ENOMEM;
+
+ netdev_dbg(bp->dev,
+ "Allocated RX buffers of %d bytes at %08lx (mapped %p)\n",
+ size, (unsigned long)bp->rx_buffers_dma, bp->rx_buffers);
+ return 0;
+}
+
+static int macb_alloc_consistent(struct macb *bp)
+{
+ struct macb_queue *queue;
+ unsigned int q;
+ int size;
+
+ for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
+ size = TX_RING_BYTES(bp);
+ queue->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
+ &queue->tx_ring_dma,
+ GFP_KERNEL);
+ if (!queue->tx_ring)
+ goto out_err;
+ netdev_dbg(bp->dev,
+ "Allocated TX ring for queue %u of %d bytes at %08lx (mapped %p)\n",
+ q, size, (unsigned long)queue->tx_ring_dma,
+ queue->tx_ring);
+
+ size = bp->tx_ring_size * sizeof(struct macb_tx_skb);
+ queue->tx_skb = kmalloc(size, GFP_KERNEL);
+ if (!queue->tx_skb)
+ goto out_err;
+ }
+
+ size = RX_RING_BYTES(bp);
+ bp->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size,
+ &bp->rx_ring_dma, GFP_KERNEL);
+ if (!bp->rx_ring)
+ goto out_err;
+ netdev_dbg(bp->dev,
+ "Allocated RX ring of %d bytes at %08lx (mapped %p)\n",
+ size, (unsigned long)bp->rx_ring_dma, bp->rx_ring);
+
+ if (bp->macbgem_ops.mog_alloc_rx_buffers(bp))
+ goto out_err;
+
+ return 0;
+
+out_err:
+ macb_free_consistent(bp);
+ return -ENOMEM;
+}
+
+static void gem_init_rings(struct macb *bp)
+{
+ struct macb_queue *queue;
+ struct macb_dma_desc *desc = NULL;
+ unsigned int q;
+ int i;
+
+ for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
+ for (i = 0; i < bp->tx_ring_size; i++) {
+ desc = macb_tx_desc(queue, i);
+ macb_set_addr(bp, desc, 0);
+ desc->ctrl = MACB_BIT(TX_USED);
+ }
+ desc->ctrl |= MACB_BIT(TX_WRAP);
+ queue->tx_head = 0;
+ queue->tx_tail = 0;
+ }
+
+ bp->rx_tail = 0;
+ bp->rx_prepared_head = 0;
+
+ gem_rx_refill(bp);
+}
+
+static void macb_init_rings(struct macb *bp)
+{
+ int i;
+ struct macb_dma_desc *desc = NULL;
+
+ macb_init_rx_ring(bp);
+
+ for (i = 0; i < bp->tx_ring_size; i++) {
+ desc = macb_tx_desc(&bp->queues[0], i);
+ macb_set_addr(bp, desc, 0);
+ desc->ctrl = MACB_BIT(TX_USED);
+ }
+ bp->queues[0].tx_head = 0;
+ bp->queues[0].tx_tail = 0;
+ desc->ctrl |= MACB_BIT(TX_WRAP);
+}
+
+static void macb_reset_hw(struct macb *bp)
+{
+ struct macb_queue *queue;
+ unsigned int q;
+
+ /* Disable RX and TX (XXX: Should we halt the transmission
+ * more gracefully?)
+ */
+ macb_writel(bp, NCR, 0);
+
+ /* Clear the stats registers (XXX: Update stats first?) */
+ macb_writel(bp, NCR, MACB_BIT(CLRSTAT));
+
+ /* Clear all status flags */
+ macb_writel(bp, TSR, -1);
+ macb_writel(bp, RSR, -1);
+
+ /* Disable all interrupts */
+ for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
+ queue_writel(queue, IDR, -1);
+ queue_readl(queue, ISR);
+ if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
+ queue_writel(queue, ISR, -1);
+ }
+}
+
+static u32 gem_mdc_clk_div(struct macb *bp)
+{
+ u32 config;
+ unsigned long pclk_hz = clk_get_rate(bp->pclk);
+
+ if (pclk_hz <= 20000000)
+ config = GEM_BF(CLK, GEM_CLK_DIV8);
+ else if (pclk_hz <= 40000000)
+ config = GEM_BF(CLK, GEM_CLK_DIV16);
+ else if (pclk_hz <= 80000000)
+ config = GEM_BF(CLK, GEM_CLK_DIV32);
+ else if (pclk_hz <= 120000000)
+ config = GEM_BF(CLK, GEM_CLK_DIV48);
+ else if (pclk_hz <= 160000000)
+ config = GEM_BF(CLK, GEM_CLK_DIV64);
+ else
+ config = GEM_BF(CLK, GEM_CLK_DIV96);
+
+ return config;
+}
+
+static u32 macb_mdc_clk_div(struct macb *bp)
+{
+ u32 config;
+ unsigned long pclk_hz;
+
+ if (macb_is_gem(bp))
+ return gem_mdc_clk_div(bp);
+
+ pclk_hz = clk_get_rate(bp->pclk);
+ if (pclk_hz <= 20000000)
+ config = MACB_BF(CLK, MACB_CLK_DIV8);
+ else if (pclk_hz <= 40000000)
+ config = MACB_BF(CLK, MACB_CLK_DIV16);
+ else if (pclk_hz <= 80000000)
+ config = MACB_BF(CLK, MACB_CLK_DIV32);
+ else
+ config = MACB_BF(CLK, MACB_CLK_DIV64);
+
+ return config;
+}
+
+/* Get the DMA bus width field of the network configuration register that we
+ * should program. We find the width from decoding the design configuration
+ * register to find the maximum supported data bus width.
+ */
+static u32 macb_dbw(struct macb *bp)
+{
+ if (!macb_is_gem(bp))
+ return 0;
+
+ switch (GEM_BFEXT(DBWDEF, gem_readl(bp, DCFG1))) {
+ case 4:
+ return GEM_BF(DBW, GEM_DBW128);
+ case 2:
+ return GEM_BF(DBW, GEM_DBW64);
+ case 1:
+ default:
+ return GEM_BF(DBW, GEM_DBW32);
+ }
+}
+
+/* Configure the receive DMA engine
+ * - use the correct receive buffer size
+ * - set best burst length for DMA operations
+ * (if not supported by FIFO, it will fallback to default)
+ * - set both rx/tx packet buffers to full memory size
+ * These are configurable parameters for GEM.
+ */
+static void macb_configure_dma(struct macb *bp)
+{
+ u32 dmacfg;
+
+ if (macb_is_gem(bp)) {
+ dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L);
+ dmacfg |= GEM_BF(RXBS, bp->rx_buffer_size / RX_BUFFER_MULTIPLE);
+ if (bp->dma_burst_length)
+ dmacfg = GEM_BFINS(FBLDO, bp->dma_burst_length, dmacfg);
+ dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L);
+ dmacfg &= ~GEM_BIT(ENDIA_PKT);
+
+ if (bp->native_io)
+ dmacfg &= ~GEM_BIT(ENDIA_DESC);
+ else
+ dmacfg |= GEM_BIT(ENDIA_DESC); /* CPU in big endian */
+
+ if (bp->dev->features & NETIF_F_HW_CSUM)
+ dmacfg |= GEM_BIT(TXCOEN);
+ else
+ dmacfg &= ~GEM_BIT(TXCOEN);
+
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+ if (bp->hw_dma_cap & HW_DMA_CAP_64B)
+ dmacfg |= GEM_BIT(ADDR64);
+#endif
+#ifdef CONFIG_MACB_USE_HWSTAMP
+ if (bp->hw_dma_cap & HW_DMA_CAP_PTP)
+ dmacfg |= GEM_BIT(RXEXT) | GEM_BIT(TXEXT);
+#endif
+ netdev_dbg(bp->dev, "Cadence configure DMA with 0x%08x\n",
+ dmacfg);
+ gem_writel(bp, DMACFG, dmacfg);
+ }
+}
+
+static void macb_init_hw(struct macb *bp)
+{
+ struct macb_queue *queue;
+ unsigned int q;
+
+ u32 config;
+
+ macb_reset_hw(bp);
+ macb_set_hwaddr(bp);
+
+ config = macb_mdc_clk_div(bp);
+ if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII)
+ config |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL);
+ config |= MACB_BF(RBOF, NET_IP_ALIGN); /* Make eth data aligned */
+ config |= MACB_BIT(PAE); /* PAuse Enable */
+ config |= MACB_BIT(DRFCS); /* Discard Rx FCS */
+ if (bp->caps & MACB_CAPS_JUMBO)
+ config |= MACB_BIT(JFRAME); /* Enable jumbo frames */
+ else
+ config |= MACB_BIT(BIG); /* Receive oversized frames */
+ if (bp->dev->flags & IFF_PROMISC)
+ config |= MACB_BIT(CAF); /* Copy All Frames */
+ else if (macb_is_gem(bp) && bp->dev->features & NETIF_F_RXCSUM)
+ config |= GEM_BIT(RXCOEN);
+ if (!(bp->dev->flags & IFF_BROADCAST))
+ config |= MACB_BIT(NBC); /* No BroadCast */
+ config |= macb_dbw(bp);
+ macb_writel(bp, NCFGR, config);
+ if ((bp->caps & MACB_CAPS_JUMBO) && bp->jumbo_max_len)
+ gem_writel(bp, JML, bp->jumbo_max_len);
+ bp->speed = SPEED_10;
+ bp->duplex = DUPLEX_HALF;
+ bp->rx_frm_len_mask = MACB_RX_FRMLEN_MASK;
+ if (bp->caps & MACB_CAPS_JUMBO)
+ bp->rx_frm_len_mask = MACB_RX_JFRMLEN_MASK;
+
+ macb_configure_dma(bp);
+
+ /* Initialize TX and RX buffers */
+ macb_writel(bp, RBQP, lower_32_bits(bp->rx_ring_dma));
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+ if (bp->hw_dma_cap & HW_DMA_CAP_64B)
+ macb_writel(bp, RBQPH, upper_32_bits(bp->rx_ring_dma));
+#endif
+ for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
+ queue_writel(queue, TBQP, lower_32_bits(queue->tx_ring_dma));
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+ if (bp->hw_dma_cap & HW_DMA_CAP_64B)
+ queue_writel(queue, TBQPH, upper_32_bits(queue->tx_ring_dma));
+#endif
+
+ /* Enable interrupts */
+ queue_writel(queue, IER,
+ MACB_RX_INT_FLAGS |
+ MACB_TX_INT_FLAGS |
+ MACB_BIT(HRESP));
+ }
+
+ /* Enable TX and RX */
+ macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE) | MACB_BIT(MPE));
+}
+
+/* The hash address register is 64 bits long and takes up two
+ * locations in the memory map. The least significant bits are stored
+ * in EMAC_HSL and the most significant bits in EMAC_HSH.
+ *
+ * The unicast hash enable and the multicast hash enable bits in the
+ * network configuration register enable the reception of hash matched
+ * frames. The destination address is reduced to a 6 bit index into
+ * the 64 bit hash register using the following hash function. The
+ * hash function is an exclusive or of every sixth bit of the
+ * destination address.
+ *
+ * hi[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47]
+ * hi[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46]
+ * hi[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45]
+ * hi[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44]
+ * hi[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43]
+ * hi[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42]
+ *
+ * da[0] represents the least significant bit of the first byte
+ * received, that is, the multicast/unicast indicator, and da[47]
+ * represents the most significant bit of the last byte received. If
+ * the hash index, hi[n], points to a bit that is set in the hash
+ * register then the frame will be matched according to whether the
+ * frame is multicast or unicast. A multicast match will be signalled
+ * if the multicast hash enable bit is set, da[0] is 1 and the hash
+ * index points to a bit set in the hash register. A unicast match
+ * will be signalled if the unicast hash enable bit is set, da[0] is 0
+ * and the hash index points to a bit set in the hash register. To
+ * receive all multicast frames, the hash register should be set with
+ * all ones and the multicast hash enable bit should be set in the
+ * network configuration register.
+ */
+
+static inline int hash_bit_value(int bitnr, __u8 *addr)
+{
+ if (addr[bitnr / 8] & (1 << (bitnr % 8)))
+ return 1;
+ return 0;
+}
+
+/* Return the hash index value for the specified address. */
+static int hash_get_index(__u8 *addr)
+{
+ int i, j, bitval;
+ int hash_index = 0;
+
+ for (j = 0; j < 6; j++) {
+ for (i = 0, bitval = 0; i < 8; i++)
+ bitval ^= hash_bit_value(i * 6 + j, addr);
+
+ hash_index |= (bitval << j);
+ }
+
+ return hash_index;
+}
+
+/* Add multicast addresses to the internal multicast-hash table. */
+static void macb_sethashtable(struct net_device *dev)
+{
+ struct netdev_hw_addr *ha;
+ unsigned long mc_filter[2];
+ unsigned int bitnr;
+ struct macb *bp = netdev_priv(dev);
+
+ mc_filter[0] = 0;
+ mc_filter[1] = 0;
+
+ netdev_for_each_mc_addr(ha, dev) {
+ bitnr = hash_get_index(ha->addr);
+ mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
+ }
+
+ macb_or_gem_writel(bp, HRB, mc_filter[0]);
+ macb_or_gem_writel(bp, HRT, mc_filter[1]);
+}
+
+/* Enable/Disable promiscuous and multicast modes. */
+static void macb_set_rx_mode(struct net_device *dev)
+{
+ unsigned long cfg;
+ struct macb *bp = netdev_priv(dev);
+
+ cfg = macb_readl(bp, NCFGR);
+
+ if (dev->flags & IFF_PROMISC) {
+ /* Enable promiscuous mode */
+ cfg |= MACB_BIT(CAF);
+
+ /* Disable RX checksum offload */
+ if (macb_is_gem(bp))
+ cfg &= ~GEM_BIT(RXCOEN);
+ } else {
+ /* Disable promiscuous mode */
+ cfg &= ~MACB_BIT(CAF);
+
+ /* Enable RX checksum offload only if requested */
+ if (macb_is_gem(bp) && dev->features & NETIF_F_RXCSUM)
+ cfg |= GEM_BIT(RXCOEN);
+ }
+
+ if (dev->flags & IFF_ALLMULTI) {
+ /* Enable all multicast mode */
+ macb_or_gem_writel(bp, HRB, -1);
+ macb_or_gem_writel(bp, HRT, -1);
+ cfg |= MACB_BIT(NCFGR_MTI);
+ } else if (!netdev_mc_empty(dev)) {
+ /* Enable specific multicasts */
+ macb_sethashtable(dev);
+ cfg |= MACB_BIT(NCFGR_MTI);
+ } else if (dev->flags & (~IFF_ALLMULTI)) {
+ /* Disable all multicast mode */
+ macb_or_gem_writel(bp, HRB, 0);
+ macb_or_gem_writel(bp, HRT, 0);
+ cfg &= ~MACB_BIT(NCFGR_MTI);
+ }
+
+ macb_writel(bp, NCFGR, cfg);
+}
+
+static int macb_open(struct net_device *dev)
+{
+ struct macb *bp = netdev_priv(dev);
+ size_t bufsz = dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN;
+ int err;
+
+ netdev_dbg(bp->dev, "open\n");
+
+ /* carrier starts down */
+ netif_carrier_off(dev);
+
+ /* if the phy is not yet register, retry later*/
+ if (!dev->phydev)
+ return -EAGAIN;
+
+ /* RX buffers initialization */
+ macb_init_rx_buffer_size(bp, bufsz);
+
+ err = macb_alloc_consistent(bp);
+ if (err) {
+ netdev_err(dev, "Unable to allocate DMA memory (error %d)\n",
+ err);
+ return err;
+ }
+
+ napi_enable(&bp->napi);
+
+ bp->macbgem_ops.mog_init_rings(bp);
+ macb_init_hw(bp);
+
+ /* schedule a link state check */
+ phy_start(dev->phydev);
+
+ netif_tx_start_all_queues(dev);
+
+ if (bp->ptp_info)
+ bp->ptp_info->ptp_init(dev);
+
+ return 0;
+}
+
+static int macb_close(struct net_device *dev)
+{
+ struct macb *bp = netdev_priv(dev);
+ unsigned long flags;
+
+ netif_tx_stop_all_queues(dev);
+ napi_disable(&bp->napi);
+
+ if (dev->phydev)
+ phy_stop(dev->phydev);
+
+ spin_lock_irqsave(&bp->lock, flags);
+ macb_reset_hw(bp);
+ netif_carrier_off(dev);
+ spin_unlock_irqrestore(&bp->lock, flags);
+
+ macb_free_consistent(bp);
+
+ if (bp->ptp_info)
+ bp->ptp_info->ptp_remove(dev);
+
+ return 0;
+}
+
+static int macb_change_mtu(struct net_device *dev, int new_mtu)
+{
+ if (netif_running(dev))
+ return -EBUSY;
+
+ dev->mtu = new_mtu;
+
+ return 0;
+}
+
+static void gem_update_stats(struct macb *bp)
+{
+ unsigned int i;
+ u32 *p = &bp->hw_stats.gem.tx_octets_31_0;
+
+ for (i = 0; i < GEM_STATS_LEN; ++i, ++p) {
+ u32 offset = gem_statistics[i].offset;
+ u64 val = bp->macb_reg_readl(bp, offset);
+
+ bp->ethtool_stats[i] += val;
+ *p += val;
+
+ if (offset == GEM_OCTTXL || offset == GEM_OCTRXL) {
+ /* Add GEM_OCTTXH, GEM_OCTRXH */
+ val = bp->macb_reg_readl(bp, offset + 4);
+ bp->ethtool_stats[i] += ((u64)val) << 32;
+ *(++p) += val;
+ }
+ }
+}
+
+static struct net_device_stats *gem_get_stats(struct macb *bp)
+{
+ struct gem_stats *hwstat = &bp->hw_stats.gem;
+ struct net_device_stats *nstat = &bp->dev->stats;
+
+ gem_update_stats(bp);
+
+ nstat->rx_errors = (hwstat->rx_frame_check_sequence_errors +
+ hwstat->rx_alignment_errors +
+ hwstat->rx_resource_errors +
+ hwstat->rx_overruns +
+ hwstat->rx_oversize_frames +
+ hwstat->rx_jabbers +
+ hwstat->rx_undersized_frames +
+ hwstat->rx_length_field_frame_errors);
+ nstat->tx_errors = (hwstat->tx_late_collisions +
+ hwstat->tx_excessive_collisions +
+ hwstat->tx_underrun +
+ hwstat->tx_carrier_sense_errors);
+ nstat->multicast = hwstat->rx_multicast_frames;
+ nstat->collisions = (hwstat->tx_single_collision_frames +
+ hwstat->tx_multiple_collision_frames +
+ hwstat->tx_excessive_collisions);
+ nstat->rx_length_errors = (hwstat->rx_oversize_frames +
+ hwstat->rx_jabbers +
+ hwstat->rx_undersized_frames +
+ hwstat->rx_length_field_frame_errors);
+ nstat->rx_over_errors = hwstat->rx_resource_errors;
+ nstat->rx_crc_errors = hwstat->rx_frame_check_sequence_errors;
+ nstat->rx_frame_errors = hwstat->rx_alignment_errors;
+ nstat->rx_fifo_errors = hwstat->rx_overruns;
+ nstat->tx_aborted_errors = hwstat->tx_excessive_collisions;
+ nstat->tx_carrier_errors = hwstat->tx_carrier_sense_errors;
+ nstat->tx_fifo_errors = hwstat->tx_underrun;
+
+ return nstat;
+}
+
+static void gem_get_ethtool_stats(struct net_device *dev,
+ struct ethtool_stats *stats, u64 *data)
+{
+ struct macb *bp;
+
+ bp = netdev_priv(dev);
+ gem_update_stats(bp);
+ memcpy(data, &bp->ethtool_stats, sizeof(u64) * GEM_STATS_LEN);
+}
+
+static int gem_get_sset_count(struct net_device *dev, int sset)
+{
+ switch (sset) {
+ case ETH_SS_STATS:
+ return GEM_STATS_LEN;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static void gem_get_ethtool_strings(struct net_device *dev, u32 sset, u8 *p)
+{
+ unsigned int i;
+
+ switch (sset) {
+ case ETH_SS_STATS:
+ for (i = 0; i < GEM_STATS_LEN; i++, p += ETH_GSTRING_LEN)
+ memcpy(p, gem_statistics[i].stat_string,
+ ETH_GSTRING_LEN);
+ break;
+ }
+}
+
+static struct net_device_stats *macb_get_stats(struct net_device *dev)
+{
+ struct macb *bp = netdev_priv(dev);
+ struct net_device_stats *nstat = &bp->dev->stats;
+ struct macb_stats *hwstat = &bp->hw_stats.macb;
+
+ if (macb_is_gem(bp))
+ return gem_get_stats(bp);
+
+ /* read stats from hardware */
+ macb_update_stats(bp);
+
+ /* Convert HW stats into netdevice stats */
+ nstat->rx_errors = (hwstat->rx_fcs_errors +
+ hwstat->rx_align_errors +
+ hwstat->rx_resource_errors +
+ hwstat->rx_overruns +
+ hwstat->rx_oversize_pkts +
+ hwstat->rx_jabbers +
+ hwstat->rx_undersize_pkts +
+ hwstat->rx_length_mismatch);
+ nstat->tx_errors = (hwstat->tx_late_cols +
+ hwstat->tx_excessive_cols +
+ hwstat->tx_underruns +
+ hwstat->tx_carrier_errors +
+ hwstat->sqe_test_errors);
+ nstat->collisions = (hwstat->tx_single_cols +
+ hwstat->tx_multiple_cols +
+ hwstat->tx_excessive_cols);
+ nstat->rx_length_errors = (hwstat->rx_oversize_pkts +
+ hwstat->rx_jabbers +
+ hwstat->rx_undersize_pkts +
+ hwstat->rx_length_mismatch);
+ nstat->rx_over_errors = hwstat->rx_resource_errors +
+ hwstat->rx_overruns;
+ nstat->rx_crc_errors = hwstat->rx_fcs_errors;
+ nstat->rx_frame_errors = hwstat->rx_align_errors;
+ nstat->rx_fifo_errors = hwstat->rx_overruns;
+ /* XXX: What does "missed" mean? */
+ nstat->tx_aborted_errors = hwstat->tx_excessive_cols;
+ nstat->tx_carrier_errors = hwstat->tx_carrier_errors;
+ nstat->tx_fifo_errors = hwstat->tx_underruns;
+ /* Don't know about heartbeat or window errors... */
+
+ return nstat;
+}
+
+static int macb_get_regs_len(struct net_device *netdev)
+{
+ return MACB_GREGS_NBR * sizeof(u32);
+}
+
+static void macb_get_regs(struct net_device *dev, struct ethtool_regs *regs,
+ void *p)
+{
+ struct macb *bp = netdev_priv(dev);
+ unsigned int tail, head;
+ u32 *regs_buff = p;
+
+ regs->version = (macb_readl(bp, MID) & ((1 << MACB_REV_SIZE) - 1))
+ | MACB_GREGS_VERSION;
+
+ tail = macb_tx_ring_wrap(bp, bp->queues[0].tx_tail);
+ head = macb_tx_ring_wrap(bp, bp->queues[0].tx_head);
+
+ regs_buff[0] = macb_readl(bp, NCR);
+ regs_buff[1] = macb_or_gem_readl(bp, NCFGR);
+ regs_buff[2] = macb_readl(bp, NSR);
+ regs_buff[3] = macb_readl(bp, TSR);
+ regs_buff[4] = macb_readl(bp, RBQP);
+ regs_buff[5] = macb_readl(bp, TBQP);
+ regs_buff[6] = macb_readl(bp, RSR);
+ regs_buff[7] = macb_readl(bp, IMR);
+
+ regs_buff[8] = tail;
+ regs_buff[9] = head;
+ regs_buff[10] = macb_tx_dma(&bp->queues[0], tail);
+ regs_buff[11] = macb_tx_dma(&bp->queues[0], head);
+
+ if (!(bp->caps & MACB_CAPS_USRIO_DISABLED))
+ regs_buff[12] = macb_or_gem_readl(bp, USRIO);
+ if (macb_is_gem(bp))
+ regs_buff[13] = gem_readl(bp, DMACFG);
+}
+
+static void macb_get_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
+{
+ struct macb *bp = netdev_priv(netdev);
+
+ wol->supported = 0;
+ wol->wolopts = 0;
+
+ if (bp->wol & MACB_WOL_HAS_MAGIC_PACKET) {
+ wol->supported = WAKE_MAGIC;
+
+ if (bp->wol & MACB_WOL_ENABLED)
+ wol->wolopts |= WAKE_MAGIC;
+ }
+}
+
+static int macb_set_wol(struct net_device *netdev, struct ethtool_wolinfo *wol)
+{
+ struct macb *bp = netdev_priv(netdev);
+
+ if (!(bp->wol & MACB_WOL_HAS_MAGIC_PACKET) ||
+ (wol->wolopts & ~WAKE_MAGIC))
+ return -EOPNOTSUPP;
+
+ if (wol->wolopts & WAKE_MAGIC)
+ bp->wol |= MACB_WOL_ENABLED;
+ else
+ bp->wol &= ~MACB_WOL_ENABLED;
+
+ device_set_wakeup_enable(&bp->pdev->dev, bp->wol & MACB_WOL_ENABLED);
+
+ return 0;
+}
+
+static void macb_get_ringparam(struct net_device *netdev,
+ struct ethtool_ringparam *ring)
+{
+ struct macb *bp = netdev_priv(netdev);
+
+ ring->rx_max_pending = MAX_RX_RING_SIZE;
+ ring->tx_max_pending = MAX_TX_RING_SIZE;
+
+ ring->rx_pending = bp->rx_ring_size;
+ ring->tx_pending = bp->tx_ring_size;
+}
+
+static int macb_set_ringparam(struct net_device *netdev,
+ struct ethtool_ringparam *ring)
+{
+ struct macb *bp = netdev_priv(netdev);
+ u32 new_rx_size, new_tx_size;
+ unsigned int reset = 0;
+
+ if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending))
+ return -EINVAL;
+
+ new_rx_size = clamp_t(u32, ring->rx_pending,
+ MIN_RX_RING_SIZE, MAX_RX_RING_SIZE);
+ new_rx_size = roundup_pow_of_two(new_rx_size);
+
+ new_tx_size = clamp_t(u32, ring->tx_pending,
+ MIN_TX_RING_SIZE, MAX_TX_RING_SIZE);
+ new_tx_size = roundup_pow_of_two(new_tx_size);
+
+ if ((new_tx_size == bp->tx_ring_size) &&
+ (new_rx_size == bp->rx_ring_size)) {
+ /* nothing to do */
+ return 0;
+ }
+
+ if (netif_running(bp->dev)) {
+ reset = 1;
+ macb_close(bp->dev);
+ }
+
+ bp->rx_ring_size = new_rx_size;
+ bp->tx_ring_size = new_tx_size;
+
+ if (reset)
+ macb_open(bp->dev);
+
+ return 0;
+}
+
+static int macb_get_ts_info(struct net_device *netdev,
+ struct ethtool_ts_info *info)
+{
+ struct macb *bp = netdev_priv(netdev);
+
+ if (bp->ptp_info)
+ return bp->ptp_info->get_ts_info(netdev, info);
+
+ return ethtool_op_get_ts_info(netdev, info);
+}
+
+static const struct ethtool_ops macb_ethtool_ops = {
+ .get_regs_len = macb_get_regs_len,
+ .get_regs = macb_get_regs,
+ .get_link = ethtool_op_get_link,
+ .get_ts_info = ethtool_op_get_ts_info,
+ .get_wol = macb_get_wol,
+ .set_wol = macb_set_wol,
+ .get_link_ksettings = phy_ethtool_get_link_ksettings,
+ .set_link_ksettings = phy_ethtool_set_link_ksettings,
+ .get_ringparam = macb_get_ringparam,
+ .set_ringparam = macb_set_ringparam,
+};
+
+static const struct ethtool_ops gem_ethtool_ops = {
+ .get_regs_len = macb_get_regs_len,
+ .get_regs = macb_get_regs,
+ .get_link = ethtool_op_get_link,
+ .get_ts_info = macb_get_ts_info,
+ .get_ethtool_stats = gem_get_ethtool_stats,
+ .get_strings = gem_get_ethtool_strings,
+ .get_sset_count = gem_get_sset_count,
+ .get_link_ksettings = phy_ethtool_get_link_ksettings,
+ .set_link_ksettings = phy_ethtool_set_link_ksettings,
+ .get_ringparam = macb_get_ringparam,
+ .set_ringparam = macb_set_ringparam,
+};
+
+static int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+ struct phy_device *phydev = dev->phydev;
+ struct macb *bp = netdev_priv(dev);
+
+ if (!netif_running(dev))
+ return -EINVAL;
+
+ if (!phydev)
+ return -ENODEV;
+
+ if (!bp->ptp_info)
+ return phy_mii_ioctl(phydev, rq, cmd);
+
+ switch (cmd) {
+ case SIOCSHWTSTAMP:
+ return bp->ptp_info->set_hwtst(dev, rq, cmd);
+ case SIOCGHWTSTAMP:
+ return bp->ptp_info->get_hwtst(dev, rq);
+ default:
+ return phy_mii_ioctl(phydev, rq, cmd);
+ }
+}
+
+static int macb_set_features(struct net_device *netdev,
+ netdev_features_t features)
+{
+ struct macb *bp = netdev_priv(netdev);
+ netdev_features_t changed = features ^ netdev->features;
+
+ /* TX checksum offload */
+ if ((changed & NETIF_F_HW_CSUM) && macb_is_gem(bp)) {
+ u32 dmacfg;
+
+ dmacfg = gem_readl(bp, DMACFG);
+ if (features & NETIF_F_HW_CSUM)
+ dmacfg |= GEM_BIT(TXCOEN);
+ else
+ dmacfg &= ~GEM_BIT(TXCOEN);
+ gem_writel(bp, DMACFG, dmacfg);
+ }
+
+ /* RX checksum offload */
+ if ((changed & NETIF_F_RXCSUM) && macb_is_gem(bp)) {
+ u32 netcfg;
+
+ netcfg = gem_readl(bp, NCFGR);
+ if (features & NETIF_F_RXCSUM &&
+ !(netdev->flags & IFF_PROMISC))
+ netcfg |= GEM_BIT(RXCOEN);
+ else
+ netcfg &= ~GEM_BIT(RXCOEN);
+ gem_writel(bp, NCFGR, netcfg);
+ }
+
+ return 0;
+}
+
+static const struct net_device_ops macb_netdev_ops = {
+ .ndo_open = macb_open,
+ .ndo_stop = macb_close,
+ .ndo_start_xmit = macb_start_xmit,
+ .ndo_set_rx_mode = macb_set_rx_mode,
+ .ndo_get_stats = macb_get_stats,
+ .ndo_do_ioctl = macb_ioctl,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_change_mtu = macb_change_mtu,
+ .ndo_set_mac_address = eth_mac_addr,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = macb_poll_controller,
+#endif
+ .ndo_set_features = macb_set_features,
+ .ndo_features_check = macb_features_check,
+};
+
+/* Configure peripheral capabilities according to device tree
+ * and integration options used
+ */
+static void macb_configure_caps(struct macb *bp,
+ const struct macb_config *dt_conf)
+{
+ u32 dcfg;
+
+ if (dt_conf)
+ bp->caps = dt_conf->caps;
+
+ if (hw_is_gem(bp->regs, bp->native_io)) {
+ bp->caps |= MACB_CAPS_MACB_IS_GEM;
+
+ dcfg = gem_readl(bp, DCFG1);
+ if (GEM_BFEXT(IRQCOR, dcfg) == 0)
+ bp->caps |= MACB_CAPS_ISR_CLEAR_ON_WRITE;
+ dcfg = gem_readl(bp, DCFG2);
+ if ((dcfg & (GEM_BIT(RX_PKT_BUFF) | GEM_BIT(TX_PKT_BUFF))) == 0)
+ bp->caps |= MACB_CAPS_FIFO_MODE;
+ if (IS_ENABLED(CONFIG_MACB_USE_HWSTAMP) && gem_has_ptp(bp)) {
+ if (!GEM_BFEXT(TSU, gem_readl(bp, DCFG5)))
+ pr_err("GEM doesn't support hardware ptp.\n");
+ else
+ bp->hw_dma_cap |= HW_DMA_CAP_PTP;
+ }
+ }
+
+ dev_dbg(&bp->pdev->dev, "Cadence caps 0x%08x\n", bp->caps);
+}
+
+static void macb_probe_queues(void __iomem *mem,
+ bool native_io,
+ unsigned int *queue_mask,
+ unsigned int *num_queues)
+{
+ unsigned int hw_q;
+
+ *queue_mask = 0x1;
+ *num_queues = 1;
+
+ /* is it macb or gem ?
+ *
+ * We need to read directly from the hardware here because
+ * we are early in the probe process and don't have the
+ * MACB_CAPS_MACB_IS_GEM flag positioned
+ */
+ if (!hw_is_gem(mem, native_io))
+ return;
+
+ /* bit 0 is never set but queue 0 always exists */
+ *queue_mask = readl_relaxed(mem + GEM_DCFG6) & 0xff;
+
+ *queue_mask |= 0x1;
+
+ for (hw_q = 1; hw_q < MACB_MAX_QUEUES; ++hw_q)
+ if (*queue_mask & (1 << hw_q))
+ (*num_queues)++;
+}
+
+static int macb_clk_init(struct platform_device *pdev, struct clk **pclk,
+ struct clk **hclk, struct clk **tx_clk,
+ struct clk **rx_clk)
+{
+ struct macb_platform_data *pdata;
+ int err;
+
+ pdata = dev_get_platdata(&pdev->dev);
+ if (pdata) {
+ *pclk = pdata->pclk;
+ *hclk = pdata->hclk;
+ } else {
+ *pclk = devm_clk_get(&pdev->dev, "pclk");
+ *hclk = devm_clk_get(&pdev->dev, "hclk");
+ }
+
+ if (IS_ERR(*pclk)) {
+ err = PTR_ERR(*pclk);
+ dev_err(&pdev->dev, "failed to get macb_clk (%u)\n", err);
+ return err;
+ }
+
+ if (IS_ERR(*hclk)) {
+ err = PTR_ERR(*hclk);
+ dev_err(&pdev->dev, "failed to get hclk (%u)\n", err);
+ return err;
+ }
+
+ *tx_clk = devm_clk_get(&pdev->dev, "tx_clk");
+ if (IS_ERR(*tx_clk))
+ *tx_clk = NULL;
+
+ *rx_clk = devm_clk_get(&pdev->dev, "rx_clk");
+ if (IS_ERR(*rx_clk))
+ *rx_clk = NULL;
+
+ err = clk_prepare_enable(*pclk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err);
+ return err;
+ }
+
+ err = clk_prepare_enable(*hclk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable hclk (%u)\n", err);
+ goto err_disable_pclk;
+ }
+
+ err = clk_prepare_enable(*tx_clk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable tx_clk (%u)\n", err);
+ goto err_disable_hclk;
+ }
+
+ err = clk_prepare_enable(*rx_clk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable rx_clk (%u)\n", err);
+ goto err_disable_txclk;
+ }
+
+ return 0;
+
+err_disable_txclk:
+ clk_disable_unprepare(*tx_clk);
+
+err_disable_hclk:
+ clk_disable_unprepare(*hclk);
+
+err_disable_pclk:
+ clk_disable_unprepare(*pclk);
+
+ return err;
+}
+
+static int macb_init(struct platform_device *pdev)
+{
+ struct net_device *dev = platform_get_drvdata(pdev);
+ unsigned int hw_q, q;
+ struct macb *bp = netdev_priv(dev);
+ struct macb_queue *queue;
+ int err;
+ u32 val;
+
+ bp->tx_ring_size = DEFAULT_TX_RING_SIZE;
+ bp->rx_ring_size = DEFAULT_RX_RING_SIZE;
+
+ /* set the queue register mapping once for all: queue0 has a special
+ * register mapping but we don't want to test the queue index then
+ * compute the corresponding register offset at run time.
+ */
+ for (hw_q = 0, q = 0; hw_q < MACB_MAX_QUEUES; ++hw_q) {
+ if (!(bp->queue_mask & (1 << hw_q)))
+ continue;
+
+ queue = &bp->queues[q];
+ queue->bp = bp;
+ if (hw_q) {
+ queue->ISR = GEM_ISR(hw_q - 1);
+ queue->IER = GEM_IER(hw_q - 1);
+ queue->IDR = GEM_IDR(hw_q - 1);
+ queue->IMR = GEM_IMR(hw_q - 1);
+ queue->TBQP = GEM_TBQP(hw_q - 1);
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+ if (bp->hw_dma_cap & HW_DMA_CAP_64B)
+ queue->TBQPH = GEM_TBQPH(hw_q - 1);
+#endif
+ } else {
+ /* queue0 uses legacy registers */
+ queue->ISR = MACB_ISR;
+ queue->IER = MACB_IER;
+ queue->IDR = MACB_IDR;
+ queue->IMR = MACB_IMR;
+ queue->TBQP = MACB_TBQP;
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+ if (bp->hw_dma_cap & HW_DMA_CAP_64B)
+ queue->TBQPH = MACB_TBQPH;
+#endif
+ }
+
+ /* get irq: here we use the linux queue index, not the hardware
+ * queue index. the queue irq definitions in the device tree
+ * must remove the optional gaps that could exist in the
+ * hardware queue mask.
+ */
+ queue->irq = platform_get_irq(pdev, q);
+ err = devm_request_irq(&pdev->dev, queue->irq, macb_interrupt,
+ IRQF_SHARED, dev->name, queue);
+ if (err) {
+ dev_err(&pdev->dev,
+ "Unable to request IRQ %d (error %d)\n",
+ queue->irq, err);
+ return err;
+ }
+
+ INIT_WORK(&queue->tx_error_task, macb_tx_error_task);
+ q++;
+ }
+
+ dev->netdev_ops = &macb_netdev_ops;
+ netif_napi_add(dev, &bp->napi, macb_poll, 64);
+
+ /* setup appropriated routines according to adapter type */
+ if (macb_is_gem(bp)) {
+ bp->max_tx_length = GEM_MAX_TX_LEN;
+ bp->macbgem_ops.mog_alloc_rx_buffers = gem_alloc_rx_buffers;
+ bp->macbgem_ops.mog_free_rx_buffers = gem_free_rx_buffers;
+ bp->macbgem_ops.mog_init_rings = gem_init_rings;
+ bp->macbgem_ops.mog_rx = gem_rx;
+ dev->ethtool_ops = &gem_ethtool_ops;
+ } else {
+ bp->max_tx_length = MACB_MAX_TX_LEN;
+ bp->macbgem_ops.mog_alloc_rx_buffers = macb_alloc_rx_buffers;
+ bp->macbgem_ops.mog_free_rx_buffers = macb_free_rx_buffers;
+ bp->macbgem_ops.mog_init_rings = macb_init_rings;
+ bp->macbgem_ops.mog_rx = macb_rx;
+ dev->ethtool_ops = &macb_ethtool_ops;
+ }
+
+ /* Set features */
+ dev->hw_features = NETIF_F_SG;
+
+ /* Check LSO capability */
+ if (GEM_BFEXT(PBUF_LSO, gem_readl(bp, DCFG6)))
+ dev->hw_features |= MACB_NETIF_LSO;
+
+ /* Checksum offload is only available on gem with packet buffer */
+ if (macb_is_gem(bp) && !(bp->caps & MACB_CAPS_FIFO_MODE))
+ dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
+ if (bp->caps & MACB_CAPS_SG_DISABLED)
+ dev->hw_features &= ~NETIF_F_SG;
+ dev->features = dev->hw_features;
+
+ if (!(bp->caps & MACB_CAPS_USRIO_DISABLED)) {
+ val = 0;
+ if (bp->phy_interface == PHY_INTERFACE_MODE_RGMII)
+ val = GEM_BIT(RGMII);
+ else if (bp->phy_interface == PHY_INTERFACE_MODE_RMII &&
+ (bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII))
+ val = MACB_BIT(RMII);
+ else if (!(bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII))
+ val = MACB_BIT(MII);
+
+ if (bp->caps & MACB_CAPS_USRIO_HAS_CLKEN)
+ val |= MACB_BIT(CLKEN);
+
+ macb_or_gem_writel(bp, USRIO, val);
+ }
+
+ /* Set MII management clock divider */
+ val = macb_mdc_clk_div(bp);
+ val |= macb_dbw(bp);
+ if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII)
+ val |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL);
+ macb_writel(bp, NCFGR, val);
+
+ return 0;
+}
+
+#if defined(CONFIG_OF)
+/* 1518 rounded up */
+#define AT91ETHER_MAX_RBUFF_SZ 0x600
+/* max number of receive buffers */
+#define AT91ETHER_MAX_RX_DESCR 9
+
+/* Initialize and start the Receiver and Transmit subsystems */
+static int at91ether_start(struct net_device *dev)
+{
+ struct macb *lp = netdev_priv(dev);
+ struct macb_dma_desc *desc;
+ dma_addr_t addr;
+ u32 ctl;
+ int i;
+
+ lp->rx_ring = dma_alloc_coherent(&lp->pdev->dev,
+ (AT91ETHER_MAX_RX_DESCR *
+ macb_dma_desc_get_size(lp)),
+ &lp->rx_ring_dma, GFP_KERNEL);
+ if (!lp->rx_ring)
+ return -ENOMEM;
+
+ lp->rx_buffers = dma_alloc_coherent(&lp->pdev->dev,
+ AT91ETHER_MAX_RX_DESCR *
+ AT91ETHER_MAX_RBUFF_SZ,
+ &lp->rx_buffers_dma, GFP_KERNEL);
+ if (!lp->rx_buffers) {
+ dma_free_coherent(&lp->pdev->dev,
+ AT91ETHER_MAX_RX_DESCR *
+ macb_dma_desc_get_size(lp),
+ lp->rx_ring, lp->rx_ring_dma);
+ lp->rx_ring = NULL;
+ return -ENOMEM;
+ }
+
+ addr = lp->rx_buffers_dma;
+ for (i = 0; i < AT91ETHER_MAX_RX_DESCR; i++) {
+ desc = macb_rx_desc(lp, i);
+ macb_set_addr(lp, desc, addr);
+ desc->ctrl = 0;
+ addr += AT91ETHER_MAX_RBUFF_SZ;
+ }
+
+ /* Set the Wrap bit on the last descriptor */
+ desc->addr |= MACB_BIT(RX_WRAP);
+
+ /* Reset buffer index */
+ lp->rx_tail = 0;
+
+ /* Program address of descriptor list in Rx Buffer Queue register */
+ macb_writel(lp, RBQP, lp->rx_ring_dma);
+
+ /* Enable Receive and Transmit */
+ ctl = macb_readl(lp, NCR);
+ macb_writel(lp, NCR, ctl | MACB_BIT(RE) | MACB_BIT(TE));
+
+ return 0;
+}
+
+/* Open the ethernet interface */
+static int at91ether_open(struct net_device *dev)
+{
+ struct macb *lp = netdev_priv(dev);
+ u32 ctl;
+ int ret;
+
+ /* Clear internal statistics */
+ ctl = macb_readl(lp, NCR);
+ macb_writel(lp, NCR, ctl | MACB_BIT(CLRSTAT));
+
+ macb_set_hwaddr(lp);
+
+ ret = at91ether_start(dev);
+ if (ret)
+ return ret;
+
+ /* Enable MAC interrupts */
+ macb_writel(lp, IER, MACB_BIT(RCOMP) |
+ MACB_BIT(RXUBR) |
+ MACB_BIT(ISR_TUND) |
+ MACB_BIT(ISR_RLE) |
+ MACB_BIT(TCOMP) |
+ MACB_BIT(ISR_ROVR) |
+ MACB_BIT(HRESP));
+
+ /* schedule a link state check */
+ phy_start(dev->phydev);
+
+ netif_start_queue(dev);
+
+ return 0;
+}
+
+/* Close the interface */
+static int at91ether_close(struct net_device *dev)
+{
+ struct macb *lp = netdev_priv(dev);
+ u32 ctl;
+
+ /* Disable Receiver and Transmitter */
+ ctl = macb_readl(lp, NCR);
+ macb_writel(lp, NCR, ctl & ~(MACB_BIT(TE) | MACB_BIT(RE)));
+
+ /* Disable MAC interrupts */
+ macb_writel(lp, IDR, MACB_BIT(RCOMP) |
+ MACB_BIT(RXUBR) |
+ MACB_BIT(ISR_TUND) |
+ MACB_BIT(ISR_RLE) |
+ MACB_BIT(TCOMP) |
+ MACB_BIT(ISR_ROVR) |
+ MACB_BIT(HRESP));
+
+ netif_stop_queue(dev);
+
+ dma_free_coherent(&lp->pdev->dev,
+ AT91ETHER_MAX_RX_DESCR *
+ macb_dma_desc_get_size(lp),
+ lp->rx_ring, lp->rx_ring_dma);
+ lp->rx_ring = NULL;
+
+ dma_free_coherent(&lp->pdev->dev,
+ AT91ETHER_MAX_RX_DESCR * AT91ETHER_MAX_RBUFF_SZ,
+ lp->rx_buffers, lp->rx_buffers_dma);
+ lp->rx_buffers = NULL;
+
+ return 0;
+}
+
+/* Transmit packet */
+static int at91ether_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct macb *lp = netdev_priv(dev);
+
+ if (macb_readl(lp, TSR) & MACB_BIT(RM9200_BNQ)) {
+ netif_stop_queue(dev);
+
+ /* Store packet information (to free when Tx completed) */
+ lp->skb = skb;
+ lp->skb_length = skb->len;
+ lp->skb_physaddr = dma_map_single(NULL, skb->data, skb->len,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(NULL, lp->skb_physaddr)) {
+ dev_kfree_skb_any(skb);
+ dev->stats.tx_dropped++;
+ netdev_err(dev, "%s: DMA mapping error\n", __func__);
+ return NETDEV_TX_OK;
+ }
+
+ /* Set address of the data in the Transmit Address register */
+ macb_writel(lp, TAR, lp->skb_physaddr);
+ /* Set length of the packet in the Transmit Control register */
+ macb_writel(lp, TCR, skb->len);
+
+ } else {
+ netdev_err(dev, "%s called, but device is busy!\n", __func__);
+ return NETDEV_TX_BUSY;
+ }
+
+ return NETDEV_TX_OK;
+}
+
+/* Extract received frame from buffer descriptors and sent to upper layers.
+ * (Called from interrupt context)
+ */
+static void at91ether_rx(struct net_device *dev)
+{
+ struct macb *lp = netdev_priv(dev);
+ struct macb_dma_desc *desc;
+ unsigned char *p_recv;
+ struct sk_buff *skb;
+ unsigned int pktlen;
+
+ desc = macb_rx_desc(lp, lp->rx_tail);
+ while (desc->addr & MACB_BIT(RX_USED)) {
+ p_recv = lp->rx_buffers + lp->rx_tail * AT91ETHER_MAX_RBUFF_SZ;
+ pktlen = MACB_BF(RX_FRMLEN, desc->ctrl);
+ skb = netdev_alloc_skb(dev, pktlen + 2);
+ if (skb) {
+ skb_reserve(skb, 2);
+ skb_put_data(skb, p_recv, pktlen);
+
+ skb->protocol = eth_type_trans(skb, dev);
+ dev->stats.rx_packets++;
+ dev->stats.rx_bytes += pktlen;
+ netif_rx(skb);
+ } else {
+ dev->stats.rx_dropped++;
+ }
+
+ if (desc->ctrl & MACB_BIT(RX_MHASH_MATCH))
+ dev->stats.multicast++;
+
+ /* reset ownership bit */
+ desc->addr &= ~MACB_BIT(RX_USED);
+
+ /* wrap after last buffer */
+ if (lp->rx_tail == AT91ETHER_MAX_RX_DESCR - 1)
+ lp->rx_tail = 0;
+ else
+ lp->rx_tail++;
+
+ desc = macb_rx_desc(lp, lp->rx_tail);
+ }
+}
+
+/* MAC interrupt handler */
+static irqreturn_t at91ether_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct macb *lp = netdev_priv(dev);
+ u32 intstatus, ctl;
+
+ /* MAC Interrupt Status register indicates what interrupts are pending.
+ * It is automatically cleared once read.
+ */
+ intstatus = macb_readl(lp, ISR);
+
+ /* Receive complete */
+ if (intstatus & MACB_BIT(RCOMP))
+ at91ether_rx(dev);
+
+ /* Transmit complete */
+ if (intstatus & MACB_BIT(TCOMP)) {
+ /* The TCOM bit is set even if the transmission failed */
+ if (intstatus & (MACB_BIT(ISR_TUND) | MACB_BIT(ISR_RLE)))
+ dev->stats.tx_errors++;
+
+ if (lp->skb) {
+ dev_kfree_skb_irq(lp->skb);
+ lp->skb = NULL;
+ dma_unmap_single(NULL, lp->skb_physaddr,
+ lp->skb_length, DMA_TO_DEVICE);
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += lp->skb_length;
+ }
+ netif_wake_queue(dev);
+ }
+
+ /* Work-around for EMAC Errata section 41.3.1 */
+ if (intstatus & MACB_BIT(RXUBR)) {
+ ctl = macb_readl(lp, NCR);
+ macb_writel(lp, NCR, ctl & ~MACB_BIT(RE));
+ wmb();
+ macb_writel(lp, NCR, ctl | MACB_BIT(RE));
+ }
+
+ if (intstatus & MACB_BIT(ISR_ROVR))
+ netdev_err(dev, "ROVR error\n");
+
+ return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void at91ether_poll_controller(struct net_device *dev)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ at91ether_interrupt(dev->irq, dev);
+ local_irq_restore(flags);
+}
+#endif
+
+static const struct net_device_ops at91ether_netdev_ops = {
+ .ndo_open = at91ether_open,
+ .ndo_stop = at91ether_close,
+ .ndo_start_xmit = at91ether_start_xmit,
+ .ndo_get_stats = macb_get_stats,
+ .ndo_set_rx_mode = macb_set_rx_mode,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_do_ioctl = macb_ioctl,
+ .ndo_validate_addr = eth_validate_addr,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = at91ether_poll_controller,
+#endif
+};
+
+static int at91ether_clk_init(struct platform_device *pdev, struct clk **pclk,
+ struct clk **hclk, struct clk **tx_clk,
+ struct clk **rx_clk)
+{
+ int err;
+
+ *hclk = NULL;
+ *tx_clk = NULL;
+ *rx_clk = NULL;
+
+ *pclk = devm_clk_get(&pdev->dev, "ether_clk");
+ if (IS_ERR(*pclk))
+ return PTR_ERR(*pclk);
+
+ err = clk_prepare_enable(*pclk);
+ if (err) {
+ dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err);
+ return err;
+ }
+
+ return 0;
+}
+
+static int at91ether_init(struct platform_device *pdev)
+{
+ struct net_device *dev = platform_get_drvdata(pdev);
+ struct macb *bp = netdev_priv(dev);
+ int err;
+ u32 reg;
+
+ dev->netdev_ops = &at91ether_netdev_ops;
+ dev->ethtool_ops = &macb_ethtool_ops;
+
+ err = devm_request_irq(&pdev->dev, dev->irq, at91ether_interrupt,
+ 0, dev->name, dev);
+ if (err)
+ return err;
+
+ macb_writel(bp, NCR, 0);
+
+ reg = MACB_BF(CLK, MACB_CLK_DIV32) | MACB_BIT(BIG);
+ if (bp->phy_interface == PHY_INTERFACE_MODE_RMII)
+ reg |= MACB_BIT(RM9200_RMII);
+
+ macb_writel(bp, NCFGR, reg);
+
+ return 0;
+}
+
+static const struct macb_config at91sam9260_config = {
+ .caps = MACB_CAPS_USRIO_HAS_CLKEN | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
+ .clk_init = macb_clk_init,
+ .init = macb_init,
+};
+
+static const struct macb_config pc302gem_config = {
+ .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE,
+ .dma_burst_length = 16,
+ .clk_init = macb_clk_init,
+ .init = macb_init,
+};
+
+static const struct macb_config sama5d2_config = {
+ .caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
+ .dma_burst_length = 16,
+ .clk_init = macb_clk_init,
+ .init = macb_init,
+};
+
+static const struct macb_config sama5d3_config = {
+ .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE
+ | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
+ .dma_burst_length = 16,
+ .clk_init = macb_clk_init,
+ .init = macb_init,
+};
+
+static const struct macb_config sama5d4_config = {
+ .caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII,
+ .dma_burst_length = 4,
+ .clk_init = macb_clk_init,
+ .init = macb_init,
+};
+
+static const struct macb_config emac_config = {
+ .clk_init = at91ether_clk_init,
+ .init = at91ether_init,
+};
+
+static const struct macb_config np4_config = {
+ .caps = MACB_CAPS_USRIO_DISABLED,
+ .clk_init = macb_clk_init,
+ .init = macb_init,
+};
+
+static const struct macb_config zynqmp_config = {
+ .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO,
+ .dma_burst_length = 16,
+ .clk_init = macb_clk_init,
+ .init = macb_init,
+ .jumbo_max_len = 10240,
+};
+
+static const struct macb_config zynq_config = {
+ .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_NO_GIGABIT_HALF,
+ .dma_burst_length = 16,
+ .clk_init = macb_clk_init,
+ .init = macb_init,
+};
+
+static const struct of_device_id macb_dt_ids[] = {
+ { .compatible = "cdns,at32ap7000-macb" },
+ { .compatible = "cdns,at91sam9260-macb", .data = &at91sam9260_config },
+ { .compatible = "cdns,macb" },
+ { .compatible = "cdns,np4-macb", .data = &np4_config },
+ { .compatible = "cdns,pc302-gem", .data = &pc302gem_config },
+ { .compatible = "cdns,gem", .data = &pc302gem_config },
+ { .compatible = "atmel,sama5d2-gem", .data = &sama5d2_config },
+ { .compatible = "atmel,sama5d3-gem", .data = &sama5d3_config },
+ { .compatible = "atmel,sama5d4-gem", .data = &sama5d4_config },
+ { .compatible = "cdns,at91rm9200-emac", .data = &emac_config },
+ { .compatible = "cdns,emac", .data = &emac_config },
+ { .compatible = "cdns,zynqmp-gem", .data = &zynqmp_config},
+ { .compatible = "cdns,zynq-gem", .data = &zynq_config },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, macb_dt_ids);
+#endif /* CONFIG_OF */
+
+static const struct macb_config default_gem_config = {
+ .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO,
+ .dma_burst_length = 16,
+ .clk_init = macb_clk_init,
+ .init = macb_init,
+ .jumbo_max_len = 10240,
+};
+
+static int macb_probe(struct platform_device *pdev)
+{
+ const struct macb_config *macb_config = &default_gem_config;
+ int (*clk_init)(struct platform_device *, struct clk **,
+ struct clk **, struct clk **, struct clk **)
+ = macb_config->clk_init;
+ int (*init)(struct platform_device *) = macb_config->init;
+ struct device_node *np = pdev->dev.of_node;
+ struct device_node *phy_node;
+ struct clk *pclk, *hclk = NULL, *tx_clk = NULL, *rx_clk = NULL;
+ unsigned int queue_mask, num_queues;
+ struct macb_platform_data *pdata;
+ bool native_io;
+ struct phy_device *phydev;
+ struct net_device *dev;
+ struct resource *regs;
+ void __iomem *mem;
+ const char *mac;
+ struct macb *bp;
+ int err;
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ mem = devm_ioremap_resource(&pdev->dev, regs);
+ if (IS_ERR(mem))
+ return PTR_ERR(mem);
+
+ if (np) {
+ const struct of_device_id *match;
+
+ match = of_match_node(macb_dt_ids, np);
+ if (match && match->data) {
+ macb_config = match->data;
+ clk_init = macb_config->clk_init;
+ init = macb_config->init;
+ }
+ }
+
+ err = clk_init(pdev, &pclk, &hclk, &tx_clk, &rx_clk);
+ if (err)
+ return err;
+
+ native_io = hw_is_native_io(mem);
+
+ macb_probe_queues(mem, native_io, &queue_mask, &num_queues);
+ dev = alloc_etherdev_mq(sizeof(*bp), num_queues);
+ if (!dev) {
+ err = -ENOMEM;
+ goto err_disable_clocks;
+ }
+
+ dev->base_addr = regs->start;
+
+ SET_NETDEV_DEV(dev, &pdev->dev);
+
+ bp = netdev_priv(dev);
+ bp->pdev = pdev;
+ bp->dev = dev;
+ bp->regs = mem;
+ bp->native_io = native_io;
+ if (native_io) {
+ bp->macb_reg_readl = hw_readl_native;
+ bp->macb_reg_writel = hw_writel_native;
+ } else {
+ bp->macb_reg_readl = hw_readl;
+ bp->macb_reg_writel = hw_writel;
+ }
+ bp->num_queues = num_queues;
+ bp->queue_mask = queue_mask;
+ if (macb_config)
+ bp->dma_burst_length = macb_config->dma_burst_length;
+ bp->pclk = pclk;
+ bp->hclk = hclk;
+ bp->tx_clk = tx_clk;
+ bp->rx_clk = rx_clk;
+ if (macb_config)
+ bp->jumbo_max_len = macb_config->jumbo_max_len;
+
+ bp->wol = 0;
+ if (of_get_property(np, "magic-packet", NULL))
+ bp->wol |= MACB_WOL_HAS_MAGIC_PACKET;
+ device_init_wakeup(&pdev->dev, bp->wol & MACB_WOL_HAS_MAGIC_PACKET);
+
+ spin_lock_init(&bp->lock);
+
+ /* setup capabilities */
+ macb_configure_caps(bp, macb_config);
+
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+ if (GEM_BFEXT(DAW64, gem_readl(bp, DCFG6))) {
+ dma_set_mask(&pdev->dev, DMA_BIT_MASK(44));
+ bp->hw_dma_cap |= HW_DMA_CAP_64B;
+ }
+#endif
+ platform_set_drvdata(pdev, dev);
+
+ dev->irq = platform_get_irq(pdev, 0);
+ if (dev->irq < 0) {
+ err = dev->irq;
+ goto err_out_free_netdev;
+ }
+
+ /* MTU range: 68 - 1500 or 10240 */
+ dev->min_mtu = GEM_MTU_MIN_SIZE;
+ if (bp->caps & MACB_CAPS_JUMBO)
+ dev->max_mtu = gem_readl(bp, JML) - ETH_HLEN - ETH_FCS_LEN;
+ else
+ dev->max_mtu = ETH_DATA_LEN;
+
+ mac = of_get_mac_address(np);
+ if (mac)
+ ether_addr_copy(bp->dev->dev_addr, mac);
+ else
+ macb_get_hwaddr(bp);
+
+ /* Power up the PHY if there is a GPIO reset */
+ phy_node = of_get_next_available_child(np, NULL);
+ if (phy_node) {
+ int gpio = of_get_named_gpio(phy_node, "reset-gpios", 0);
+
+ if (gpio_is_valid(gpio)) {
+ bp->reset_gpio = gpio_to_desc(gpio);
+ gpiod_direction_output(bp->reset_gpio, 1);
+ }
+ }
+ of_node_put(phy_node);
+
+ err = of_get_phy_mode(np);
+ if (err < 0) {
+ pdata = dev_get_platdata(&pdev->dev);
+ if (pdata && pdata->is_rmii)
+ bp->phy_interface = PHY_INTERFACE_MODE_RMII;
+ else
+ bp->phy_interface = PHY_INTERFACE_MODE_MII;
+ } else {
+ bp->phy_interface = err;
+ }
+
+ /* IP specific init */
+ err = init(pdev);
+ if (err)
+ goto err_out_free_netdev;
+
+ err = macb_mii_init(bp);
+ if (err)
+ goto err_out_free_netdev;
+
+ phydev = dev->phydev;
+
+ netif_carrier_off(dev);
+
+ err = register_netdev(dev);
+ if (err) {
+ dev_err(&pdev->dev, "Cannot register net device, aborting.\n");
+ goto err_out_unregister_mdio;
+ }
+
+ phy_attached_info(phydev);
+
+ netdev_info(dev, "Cadence %s rev 0x%08x at 0x%08lx irq %d (%pM)\n",
+ macb_is_gem(bp) ? "GEM" : "MACB", macb_readl(bp, MID),
+ dev->base_addr, dev->irq, dev->dev_addr);
+
+ return 0;
+
+err_out_unregister_mdio:
+ phy_disconnect(dev->phydev);
+ mdiobus_unregister(bp->mii_bus);
+ mdiobus_free(bp->mii_bus);
+
+ /* Shutdown the PHY if there is a GPIO reset */
+ if (bp->reset_gpio)
+ gpiod_set_value(bp->reset_gpio, 0);
+
+err_out_free_netdev:
+ free_netdev(dev);
+
+err_disable_clocks:
+ clk_disable_unprepare(tx_clk);
+ clk_disable_unprepare(hclk);
+ clk_disable_unprepare(pclk);
+ clk_disable_unprepare(rx_clk);
+
+ return err;
+}
+
+static int macb_remove(struct platform_device *pdev)
+{
+ struct net_device *dev;
+ struct macb *bp;
+
+ dev = platform_get_drvdata(pdev);
+
+ if (dev) {
+ bp = netdev_priv(dev);
+ if (dev->phydev)
+ phy_disconnect(dev->phydev);
+ mdiobus_unregister(bp->mii_bus);
+ dev->phydev = NULL;
+ mdiobus_free(bp->mii_bus);
+
+ /* Shutdown the PHY if there is a GPIO reset */
+ if (bp->reset_gpio)
+ gpiod_set_value(bp->reset_gpio, 0);
+
+ unregister_netdev(dev);
+ clk_disable_unprepare(bp->tx_clk);
+ clk_disable_unprepare(bp->hclk);
+ clk_disable_unprepare(bp->pclk);
+ clk_disable_unprepare(bp->rx_clk);
+ of_node_put(bp->phy_node);
+ free_netdev(dev);
+ }
+
+ return 0;
+}
+
+static int __maybe_unused macb_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct net_device *netdev = platform_get_drvdata(pdev);
+ struct macb *bp = netdev_priv(netdev);
+
+ netif_carrier_off(netdev);
+ netif_device_detach(netdev);
+
+ if (bp->wol & MACB_WOL_ENABLED) {
+ macb_writel(bp, IER, MACB_BIT(WOL));
+ macb_writel(bp, WOL, MACB_BIT(MAG));
+ enable_irq_wake(bp->queues[0].irq);
+ } else {
+ clk_disable_unprepare(bp->tx_clk);
+ clk_disable_unprepare(bp->hclk);
+ clk_disable_unprepare(bp->pclk);
+ clk_disable_unprepare(bp->rx_clk);
+ }
+
+ return 0;
+}
+
+static int __maybe_unused macb_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct net_device *netdev = platform_get_drvdata(pdev);
+ struct macb *bp = netdev_priv(netdev);
+
+ if (bp->wol & MACB_WOL_ENABLED) {
+ macb_writel(bp, IDR, MACB_BIT(WOL));
+ macb_writel(bp, WOL, 0);
+ disable_irq_wake(bp->queues[0].irq);
+ } else {
+ clk_prepare_enable(bp->pclk);
+ clk_prepare_enable(bp->hclk);
+ clk_prepare_enable(bp->tx_clk);
+ clk_prepare_enable(bp->rx_clk);
+ }
+
+ netif_device_attach(netdev);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(macb_pm_ops, macb_suspend, macb_resume);
+
+static struct platform_driver macb_driver = {
+ .probe = macb_probe,
+ .remove = macb_remove,
+ .driver = {
+ .name = "macb",
+ .of_match_table = of_match_ptr(macb_dt_ids),
+ .pm = &macb_pm_ops,
+ },
+};
+
+module_platform_driver(macb_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Cadence MACB/GEM Ethernet driver");
+MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
+MODULE_ALIAS("platform:macb");
projects / mirror_ubuntu-kernels.git / commitdiff