+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Copyright (C) 2017 Hisilicon Limited, All Rights Reserved.
- * Author: Zhichang Yuan <yuanzhichang@hisilicon.com>
- * Author: Zou Rongrong <zourongrong@huawei.com>
- * Author: John Garry <john.garry@huawei.com>
- *
- */
-
-#include <linux/acpi.h>
-#include <linux/console.h>
-#include <linux/delay.h>
-#include <linux/io.h>
-#include <linux/logic_pio.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_platform.h>
-#include <linux/pci.h>
-#include <linux/slab.h>
-
-#define DRV_NAME "hisi-lpc"
-
-/*
- * Setting this bit means each IO operation will target to a
- * different port address:
- * 0 means repeatedly IO operations will stick on the same port,
- * such as BT;
- */
-#define FG_INCRADDR_LPC 0x02
-
-struct lpc_cycle_para {
- unsigned int opflags;
- unsigned int csize; /* the data length of each operation */
-};
-
-struct hisi_lpc_dev {
- spinlock_t cycle_lock;
- void __iomem *membase;
- struct logic_pio_hwaddr *io_host;
-};
-
-/* The maximum continuous cycles per burst */
-#define LPC_MAX_BURST 16
-/* The IO cycle counts supported is four per operation at maximum */
-#define LPC_MAX_DULEN 4
-#if LPC_MAX_DULEN > LPC_MAX_BURST
-#error "LPC.. MAX_DULEN must be not bigger than MAX_OPCNT!"
-#endif
-
-#if LPC_MAX_BURST % LPC_MAX_DULEN
-#error "LPC.. LPC_MAX_BURST must be multiple of LPC_MAX_DULEN!"
-#endif
-
-#define LPC_REG_START 0x00 /* start a new LPC cycle */
-#define LPC_REG_OP_STATUS 0x04 /* the current LPC status */
-#define LPC_REG_IRQ_ST 0x08 /* interrupt enable&status */
-#define LPC_REG_OP_LEN 0x10 /* how many LPC cycles each start */
-#define LPC_REG_CMD 0x14 /* command for the required LPC cycle */
-#define LPC_REG_ADDR 0x20 /* LPC target address */
-#define LPC_REG_WDATA 0x24 /* data to be written */
-#define LPC_REG_RDATA 0x28 /* data coming from peer */
-
-
-/* The command register fields */
-#define LPC_CMD_SAMEADDR 0x08
-#define LPC_CMD_TYPE_IO 0x00
-#define LPC_CMD_WRITE 0x01
-#define LPC_CMD_READ 0x00
-/* the bit attribute is W1C. 1 represents OK. */
-#define LPC_STAT_BYIRQ 0x02
-
-#define LPC_STATUS_IDLE 0x01
-#define LPC_OP_FINISHED 0x02
-
-#define LPC_START_WORK 0x01
-
-/* The minimal nanosecond interval for each query on LPC cycle status. */
-#define LPC_NSEC_PERWAIT 100
-
-/*
- * The maximum waiting time is about 128us.
- * It is specific for stream I/O, such as ins.
- * The fastest IO cycle time is about 390ns, but the worst case will wait
- * for extra 256 lpc clocks, so (256 + 13) * 30ns = 8 us. The maximum
- * burst cycles is 16. So, the maximum waiting time is about 128us under
- * worst case.
- * choose 1300 as the maximum.
- */
-#define LPC_MAX_WAITCNT 1300
-/* About 10us. This is specific for single IO operation, such as inb. */
-#define LPC_PEROP_WAITCNT 100
-
-static inline int wait_lpc_idle(unsigned char *mbase,
- unsigned int waitcnt) {
- u32 opstatus;
-
- while (waitcnt--) {
- ndelay(LPC_NSEC_PERWAIT);
- opstatus = readl(mbase + LPC_REG_OP_STATUS);
- if (opstatus & LPC_STATUS_IDLE)
- return (opstatus & LPC_OP_FINISHED) ? 0 : (-EIO);
- }
- return -ETIME;
-}
-
-/*
- * hisi_lpc_target_in - trigger a series of LPC cycles for read operation
- * @lpcdev: pointer to hisi lpc device
- * @para: some parameters used to control the lpc I/O operations
- * @addr: the lpc I/O target port address
- * @buf: where the read back data is stored
- * @opcnt: how many I/O operations required, i.e. data width
- *
- * Returns 0 on success, non-zero on fail.
- */
-static int
-hisi_lpc_target_in(struct hisi_lpc_dev *lpcdev, struct lpc_cycle_para *para,
- unsigned long addr, unsigned char *buf,
- unsigned long opcnt)
-{
- unsigned int cmd_word;
- unsigned int waitcnt;
- unsigned long flags;
- int ret;
-
- if (!buf || !opcnt || !para || !para->csize || !lpcdev)
- return -EINVAL;
-
- cmd_word = LPC_CMD_TYPE_IO | LPC_CMD_READ;
- waitcnt = LPC_PEROP_WAITCNT;
- if (!(para->opflags & FG_INCRADDR_LPC)) {
- cmd_word |= LPC_CMD_SAMEADDR;
- waitcnt = LPC_MAX_WAITCNT;
- }
-
- ret = 0;
-
- /* whole operation must be atomic */
- spin_lock_irqsave(&lpcdev->cycle_lock, flags);
-
- writel_relaxed(opcnt, lpcdev->membase + LPC_REG_OP_LEN);
-
- writel_relaxed(cmd_word, lpcdev->membase + LPC_REG_CMD);
-
- writel_relaxed(addr, lpcdev->membase + LPC_REG_ADDR);
-
- writel(LPC_START_WORK, lpcdev->membase + LPC_REG_START);
-
- /* whether the operation is finished */
- ret = wait_lpc_idle(lpcdev->membase, waitcnt);
- if (!ret) {
- for (; opcnt; opcnt--, buf++)
- *buf = readb(lpcdev->membase + LPC_REG_RDATA);
- }
-
- spin_unlock_irqrestore(&lpcdev->cycle_lock, flags);
-
- return ret;
-}
-
-/*
- * hisi_lpc_target_out - trigger a series of LPC cycles for write operation
- * @lpcdev: pointer to hisi lpc device
- * @para: some parameters used to control the lpc I/O operations
- * @addr: the lpc I/O target port address
- * @buf: where the data to be written is stored
- * @opcnt: how many I/O operations required, i.e. data width
- *
- * Returns 0 on success, non-zero on fail.
- */
-static int
-hisi_lpc_target_out(struct hisi_lpc_dev *lpcdev, struct lpc_cycle_para *para,
- unsigned long addr, const unsigned char *buf,
- unsigned long opcnt)
-{
- unsigned int cmd_word;
- unsigned int waitcnt;
- unsigned long flags;
- int ret;
-
- if (!buf || !opcnt || !para || !lpcdev)
- return -EINVAL;
-
- /* default is increasing address */
- cmd_word = LPC_CMD_TYPE_IO | LPC_CMD_WRITE;
- waitcnt = LPC_PEROP_WAITCNT;
- if (!(para->opflags & FG_INCRADDR_LPC)) {
- cmd_word |= LPC_CMD_SAMEADDR;
- waitcnt = LPC_MAX_WAITCNT;
- }
-
- spin_lock_irqsave(&lpcdev->cycle_lock, flags);
-
- writel_relaxed(opcnt, lpcdev->membase + LPC_REG_OP_LEN);
- writel_relaxed(cmd_word, lpcdev->membase + LPC_REG_CMD);
- writel_relaxed(addr, lpcdev->membase + LPC_REG_ADDR);
-
- for (; opcnt; buf++, opcnt--)
- writeb(*buf, lpcdev->membase + LPC_REG_WDATA);
-
- writel(LPC_START_WORK, lpcdev->membase + LPC_REG_START);
-
- /* whether the operation is finished */
- ret = wait_lpc_idle(lpcdev->membase, waitcnt);
-
- spin_unlock_irqrestore(&lpcdev->cycle_lock, flags);
-
- return ret;
-}
-
-static inline unsigned long
-hisi_lpc_pio_to_addr(struct hisi_lpc_dev *lpcdev, unsigned long pio)
-{
- return pio - lpcdev->io_host->io_start +
- lpcdev->io_host->hw_start;
-}
-
-/*
- * hisi_lpc_comm_in - input the data in a single operation
- * @hostdata: pointer to the device information relevant to LPC controller.
- * @pio: the target I/O port address.
- * @dwidth: the data length required to read from the target I/O port.
- *
- * When success, data is returned. Otherwise, -1 is returned.
- */
-static u32 hisi_lpc_comm_in(void *hostdata, unsigned long pio, size_t dwidth)
-{
- struct hisi_lpc_dev *lpcdev = hostdata;
- struct lpc_cycle_para iopara;
- u32 rd_data = 0;
- unsigned long addr;
- int ret = 0;
-
- if (!lpcdev || !dwidth || dwidth > LPC_MAX_DULEN)
- return -1;
-
- addr = hisi_lpc_pio_to_addr(lpcdev, pio);
-
- iopara.opflags = FG_INCRADDR_LPC;
- iopara.csize = dwidth;
-
- ret = hisi_lpc_target_in(lpcdev, &iopara, addr,
- (unsigned char *)&rd_data, dwidth);
- if (ret)
- return -1;
-
- return le32_to_cpu(rd_data);
-}
-
-/*
- * hisi_lpc_comm_out - output the data in a single operation
- * @hostdata: pointer to the device information relevant to LPC controller.
- * @pio: the target I/O port address.
- * @val: a value to be outputted from caller, maximum is four bytes.
- * @dwidth: the data width required writing to the target I/O port.
- *
- * This function is corresponding to out(b,w,l) only
- *
- */
-static void hisi_lpc_comm_out(void *hostdata, unsigned long pio,
- u32 val, size_t dwidth)
-{
- struct hisi_lpc_dev *lpcdev = hostdata;
- struct lpc_cycle_para iopara;
- const unsigned char *buf;
- unsigned long addr;
-
- if (!lpcdev || !dwidth || dwidth > LPC_MAX_DULEN)
- return;
-
- val = cpu_to_le32(val);
-
- buf = (const unsigned char *)&val;
- addr = hisi_lpc_pio_to_addr(lpcdev, pio);
-
- iopara.opflags = FG_INCRADDR_LPC;
- iopara.csize = dwidth;
-
- hisi_lpc_target_out(lpcdev, &iopara, addr, buf, dwidth);
-}
-
-/*
- * hisi_lpc_comm_ins - input the data in the buffer in multiple operations
- * @hostdata: pointer to the device information relevant to LPC controller.
- * @pio: the target I/O port address.
- * @buffer: a buffer where read/input data bytes are stored.
- * @dwidth: the data width required writing to the target I/O port.
- * @count: how many data units whose length is dwidth will be read.
- *
- * When success, the data read back is stored in buffer pointed by buffer.
- * Returns 0 on success, -errno otherwise
- *
- */
-static u32
-hisi_lpc_comm_ins(void *hostdata, unsigned long pio, void *buffer,
- size_t dwidth, unsigned int count)
-{
- struct hisi_lpc_dev *lpcdev = hostdata;
- unsigned char *buf = buffer;
- struct lpc_cycle_para iopara;
- unsigned long addr;
-
- if (!lpcdev || !buf || !count || !dwidth || dwidth > LPC_MAX_DULEN)
- return -EINVAL;
-
- iopara.opflags = 0;
- if (dwidth > 1)
- iopara.opflags |= FG_INCRADDR_LPC;
- iopara.csize = dwidth;
-
- addr = hisi_lpc_pio_to_addr(lpcdev, pio);
-
- do {
- int ret;
-
- ret = hisi_lpc_target_in(lpcdev, &iopara, addr,
- buf, dwidth);
- if (ret)
- return ret;
- buf += dwidth;
- count--;
- } while (count);
-
- return 0;
-}
-
-/*
- * hisi_lpc_comm_outs - output the data in the buffer in multiple operations
- * @hostdata: pointer to the device information relevant to LPC controller.
- * @pio: the target I/O port address.
- * @buffer: a buffer where write/output data bytes are stored.
- * @dwidth: the data width required writing to the target I/O port .
- * @count: how many data units whose length is dwidth will be written.
- *
- */
-static void
-hisi_lpc_comm_outs(void *hostdata, unsigned long pio, const void *buffer,
- size_t dwidth, unsigned int count)
-{
- struct hisi_lpc_dev *lpcdev = hostdata;
- struct lpc_cycle_para iopara;
- const unsigned char *buf = buffer;
- unsigned long addr;
-
- if (!lpcdev || !buf || !count || !dwidth || dwidth > LPC_MAX_DULEN)
- return;
-
- iopara.opflags = 0;
- if (dwidth > 1)
- iopara.opflags |= FG_INCRADDR_LPC;
- iopara.csize = dwidth;
-
- addr = hisi_lpc_pio_to_addr(lpcdev, pio);
- do {
- if (hisi_lpc_target_out(lpcdev, &iopara, addr, buf,
- dwidth))
- break;
- buf += dwidth;
- count--;
- } while (count);
-}
-
-static const struct logic_pio_host_ops hisi_lpc_ops = {
- .in = hisi_lpc_comm_in,
- .out = hisi_lpc_comm_out,
- .ins = hisi_lpc_comm_ins,
- .outs = hisi_lpc_comm_outs,
-};
-
-/*
- * hisi_lpc_probe - the probe callback function for hisi lpc host,
- * will finish all the initialization.
- * @pdev: the platform device corresponding to hisi lpc host
- *
- * Returns 0 on success, non-zero on fail.
- */
-static int hisi_lpc_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- struct acpi_device *acpi_device = ACPI_COMPANION(dev);
- struct logic_pio_hwaddr *range;
- struct hisi_lpc_dev *lpcdev;
- struct resource *res;
- int ret = 0;
-
- lpcdev = devm_kzalloc(dev, sizeof(struct hisi_lpc_dev), GFP_KERNEL);
- if (!lpcdev)
- return -ENOMEM;
-
- spin_lock_init(&lpcdev->cycle_lock);
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res)
- return -ENODEV;
-
- lpcdev->membase = devm_ioremap_resource(dev, res);
- if (IS_ERR(lpcdev->membase)) {
- dev_err(dev, "remap failed\n");
- return PTR_ERR(lpcdev->membase);
- }
-
- range = devm_kzalloc(dev, sizeof(*range), GFP_KERNEL);
- if (!range)
- return -ENOMEM;
- range->fwnode = dev->fwnode;
- range->flags = PIO_INDIRECT;
- range->size = PIO_INDIRECT_SIZE;
-
- ret = logic_pio_register_range(range);
- if (ret) {
- dev_err(dev, "register IO range failed (%d)!\n", ret);
- return ret;
- }
- lpcdev->io_host = range;
-
- /* register the LPC host PIO resources */
- if (!acpi_device)
- ret = of_platform_populate(dev->of_node, NULL, NULL, dev);
- if (ret) {
- dev_err(dev, "populate children failed (%d)\n", ret);
- return ret;
- }
-
- lpcdev->io_host->hostdata = lpcdev;
- lpcdev->io_host->ops = &hisi_lpc_ops;
-
- dev_info(dev, "registered range[%pa - sz:%pa]\n",
- &lpcdev->io_host->io_start,
- &lpcdev->io_host->size);
-
- return ret;
-}
-
-static const struct of_device_id hisi_lpc_of_match[] = {
- { .compatible = "hisilicon,hip06-lpc", },
- { .compatible = "hisilicon,hip07-lpc", },
- {}
-};
-
-static struct platform_driver hisi_lpc_driver = {
- .driver = {
- .name = DRV_NAME,
- .of_match_table = hisi_lpc_of_match,
- },
- .probe = hisi_lpc_probe,
-};
-
-builtin_platform_driver(hisi_lpc_driver);
projects / mirror_ubuntu-bionic-kernel.git / commitdiff