+++ /dev/null
-/* znet.c: An Zenith Z-Note ethernet driver for linux. */
-
-/*
- Written by Donald Becker.
-
- The author may be reached as becker@scyld.com.
- This driver is based on the Linux skeleton driver. The copyright of the
- skeleton driver is held by the United States Government, as represented
- by DIRNSA, and it is released under the GPL.
-
- Thanks to Mike Hollick for alpha testing and suggestions.
-
- References:
- The Crynwr packet driver.
-
- "82593 CSMA/CD Core LAN Controller" Intel datasheet, 1992
- Intel Microcommunications Databook, Vol. 1, 1990.
- As usual with Intel, the documentation is incomplete and inaccurate.
- I had to read the Crynwr packet driver to figure out how to actually
- use the i82593, and guess at what register bits matched the loosely
- related i82586.
-
- Theory of Operation
-
- The i82593 used in the Zenith Z-Note series operates using two(!) slave
- DMA channels, one interrupt, and one 8-bit I/O port.
-
- While there several ways to configure '593 DMA system, I chose the one
- that seemed commensurate with the highest system performance in the face
- of moderate interrupt latency: Both DMA channels are configured as
- recirculating ring buffers, with one channel (#0) dedicated to Rx and
- the other channel (#1) to Tx and configuration. (Note that this is
- different than the Crynwr driver, where the Tx DMA channel is initialized
- before each operation. That approach simplifies operation and Tx error
- recovery, but requires additional I/O in normal operation and precludes
- transmit buffer chaining.)
-
- Both rings are set to 8192 bytes using {TX,RX}_RING_SIZE. This provides
- a reasonable ring size for Rx, while simplifying DMA buffer allocation --
- DMA buffers must not cross a 128K boundary. (In truth the size selection
- was influenced by my lack of '593 documentation. I thus was constrained
- to use the Crynwr '593 initialization table, which sets the Rx ring size
- to 8K.)
-
- Despite my usual low opinion about Intel-designed parts, I must admit
- that the bulk data handling of the i82593 is a good design for
- an integrated system, like a laptop, where using two slave DMA channels
- doesn't pose a problem. I still take issue with using only a single I/O
- port. In the same controlled environment there are essentially no
- limitations on I/O space, and using multiple locations would eliminate
- the need for multiple operations when looking at status registers,
- setting the Rx ring boundary, or switching to promiscuous mode.
-
- I also question Zenith's selection of the '593: one of the advertised
- advantages of earlier Intel parts was that if you figured out the magic
- initialization incantation you could use the same part on many different
- network types. Zenith's use of the "FriendlyNet" (sic) connector rather
- than an on-board transceiver leads me to believe that they were planning
- to take advantage of this. But, uhmmm, the '593 omits all but ethernet
- functionality from the serial subsystem.
- */
-
-/* 10/2002
-
- o Resurected for Linux 2.5+ by Marc Zyngier <maz@wild-wind.fr.eu.org> :
-
- - Removed strange DMA snooping in znet_sent_packet, which lead to
- TX buffer corruption on my laptop.
- - Use init_etherdev stuff.
- - Use kmalloc-ed DMA buffers.
- - Use as few global variables as possible.
- - Use proper resources management.
- - Use wireless/i82593.h as much as possible (structure, constants)
- - Compiles as module or build-in.
- - Now survives unplugging/replugging cable.
-
- Some code was taken from wavelan_cs.
-
- Tested on a vintage Zenith Z-Note 433Lnp+. Probably broken on
- anything else. Testers (and detailed bug reports) are welcome :-).
-
- o TODO :
-
- - Properly handle multicast
- - Understand why some traffic patterns add a 1s latency...
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/errno.h>
-#include <linux/interrupt.h>
-#include <linux/ioport.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/netdevice.h>
-#include <linux/etherdevice.h>
-#include <linux/skbuff.h>
-#include <linux/if_arp.h>
-#include <linux/bitops.h>
-
-#include <asm/io.h>
-#include <asm/dma.h>
-
-#include <linux/i82593.h>
-
-static char version[] __initdata = "znet.c:v1.02 9/23/94 becker@scyld.com\n";
-
-#ifndef ZNET_DEBUG
-#define ZNET_DEBUG 1
-#endif
-static unsigned int znet_debug = ZNET_DEBUG;
-module_param (znet_debug, int, 0);
-MODULE_PARM_DESC (znet_debug, "ZNet debug level");
-MODULE_LICENSE("GPL");
-
-/* The DMA modes we need aren't in <dma.h>. */
-#define DMA_RX_MODE 0x14 /* Auto init, I/O to mem, ++, demand. */
-#define DMA_TX_MODE 0x18 /* Auto init, Mem to I/O, ++, demand. */
-#define dma_page_eq(ptr1, ptr2) ((long)(ptr1)>>17 == (long)(ptr2)>>17)
-#define RX_BUF_SIZE 8192
-#define TX_BUF_SIZE 8192
-#define DMA_BUF_SIZE (RX_BUF_SIZE + 16) /* 8k + 16 bytes for trailers */
-
-#define TX_TIMEOUT (HZ/10)
-
-struct znet_private {
- int rx_dma, tx_dma;
- spinlock_t lock;
- short sia_base, sia_size, io_size;
- struct i82593_conf_block i593_init;
- /* The starting, current, and end pointers for the packet buffers. */
- ushort *rx_start, *rx_cur, *rx_end;
- ushort *tx_start, *tx_cur, *tx_end;
- ushort tx_buf_len; /* Tx buffer length, in words. */
-};
-
-/* Only one can be built-in;-> */
-static struct net_device *znet_dev;
-
-#define NETIDBLK_MAGIC "NETIDBLK"
-#define NETIDBLK_MAGIC_SIZE 8
-
-struct netidblk {
- char magic[NETIDBLK_MAGIC_SIZE]; /* The magic number (string) "NETIDBLK" */
- unsigned char netid[8]; /* The physical station address */
- char nettype, globalopt;
- char vendor[8]; /* The machine vendor and product name. */
- char product[8];
- char irq1, irq2; /* Interrupts, only one is currently used. */
- char dma1, dma2;
- short dma_mem_misc[8]; /* DMA buffer locations (unused in Linux). */
- short iobase1, iosize1;
- short iobase2, iosize2; /* Second iobase unused. */
- char driver_options; /* Misc. bits */
- char pad;
-};
-
-static int znet_open(struct net_device *dev);
-static netdev_tx_t znet_send_packet(struct sk_buff *skb,
- struct net_device *dev);
-static irqreturn_t znet_interrupt(int irq, void *dev_id);
-static void znet_rx(struct net_device *dev);
-static int znet_close(struct net_device *dev);
-static void hardware_init(struct net_device *dev);
-static void update_stop_hit(short ioaddr, unsigned short rx_stop_offset);
-static void znet_tx_timeout (struct net_device *dev);
-
-/* Request needed resources */
-static int znet_request_resources (struct net_device *dev)
-{
- struct znet_private *znet = netdev_priv(dev);
-
- if (request_irq (dev->irq, znet_interrupt, 0, "ZNet", dev))
- goto failed;
- if (request_dma (znet->rx_dma, "ZNet rx"))
- goto free_irq;
- if (request_dma (znet->tx_dma, "ZNet tx"))
- goto free_rx_dma;
- if (!request_region (znet->sia_base, znet->sia_size, "ZNet SIA"))
- goto free_tx_dma;
- if (!request_region (dev->base_addr, znet->io_size, "ZNet I/O"))
- goto free_sia;
-
- return 0; /* Happy ! */
-
- free_sia:
- release_region (znet->sia_base, znet->sia_size);
- free_tx_dma:
- free_dma (znet->tx_dma);
- free_rx_dma:
- free_dma (znet->rx_dma);
- free_irq:
- free_irq (dev->irq, dev);
- failed:
- return -1;
-}
-
-static void znet_release_resources (struct net_device *dev)
-{
- struct znet_private *znet = netdev_priv(dev);
-
- release_region (znet->sia_base, znet->sia_size);
- release_region (dev->base_addr, znet->io_size);
- free_dma (znet->tx_dma);
- free_dma (znet->rx_dma);
- free_irq (dev->irq, dev);
-}
-
-/* Keep the magical SIA stuff in a single function... */
-static void znet_transceiver_power (struct net_device *dev, int on)
-{
- struct znet_private *znet = netdev_priv(dev);
- unsigned char v;
-
- /* Turn on/off the 82501 SIA, using zenith-specific magic. */
- /* Select LAN control register */
- outb(0x10, znet->sia_base);
-
- if (on)
- v = inb(znet->sia_base + 1) | 0x84;
- else
- v = inb(znet->sia_base + 1) & ~0x84;
-
- outb(v, znet->sia_base+1); /* Turn on/off LAN power (bit 2). */
-}
-
-/* Init the i82593, with current promisc/mcast configuration.
- Also used from hardware_init. */
-static void znet_set_multicast_list (struct net_device *dev)
-{
- struct znet_private *znet = netdev_priv(dev);
- short ioaddr = dev->base_addr;
- struct i82593_conf_block *cfblk = &znet->i593_init;
-
- memset(cfblk, 0x00, sizeof(struct i82593_conf_block));
-
- /* The configuration block. What an undocumented nightmare.
- The first set of values are those suggested (without explanation)
- for ethernet in the Intel 82586 databook. The rest appear to be
- completely undocumented, except for cryptic notes in the Crynwr
- packet driver. This driver uses the Crynwr values verbatim. */
-
- /* maz : Rewritten to take advantage of the wanvelan includes.
- At least we have names, not just blind values */
-
- /* Byte 0 */
- cfblk->fifo_limit = 10; /* = 16 B rx and 80 B tx fifo thresholds */
- cfblk->forgnesi = 0; /* 0=82C501, 1=AMD7992B compatibility */
- cfblk->fifo_32 = 1;
- cfblk->d6mod = 0; /* Run in i82593 advanced mode */
- cfblk->throttle_enb = 1;
-
- /* Byte 1 */
- cfblk->throttle = 8; /* Continuous w/interrupts, 128-clock DMA. */
- cfblk->cntrxint = 0; /* enable continuous mode receive interrupts */
- cfblk->contin = 1; /* enable continuous mode */
-
- /* Byte 2 */
- cfblk->addr_len = ETH_ALEN;
- cfblk->acloc = 1; /* Disable source addr insertion by i82593 */
- cfblk->preamb_len = 2; /* 8 bytes preamble */
- cfblk->loopback = 0; /* Loopback off */
-
- /* Byte 3 */
- cfblk->lin_prio = 0; /* Default priorities & backoff methods. */
- cfblk->tbofstop = 0;
- cfblk->exp_prio = 0;
- cfblk->bof_met = 0;
-
- /* Byte 4 */
- cfblk->ifrm_spc = 6; /* 96 bit times interframe spacing */
-
- /* Byte 5 */
- cfblk->slottim_low = 0; /* 512 bit times slot time (low) */
-
- /* Byte 6 */
- cfblk->slottim_hi = 2; /* 512 bit times slot time (high) */
- cfblk->max_retr = 15; /* 15 collisions retries */
-
- /* Byte 7 */
- cfblk->prmisc = ((dev->flags & IFF_PROMISC) ? 1 : 0); /* Promiscuous mode */
- cfblk->bc_dis = 0; /* Enable broadcast reception */
- cfblk->crs_1 = 0; /* Don't transmit without carrier sense */
- cfblk->nocrc_ins = 0; /* i82593 generates CRC */
- cfblk->crc_1632 = 0; /* 32-bit Autodin-II CRC */
- cfblk->crs_cdt = 0; /* CD not to be interpreted as CS */
-
- /* Byte 8 */
- cfblk->cs_filter = 0; /* CS is recognized immediately */
- cfblk->crs_src = 0; /* External carrier sense */
- cfblk->cd_filter = 0; /* CD is recognized immediately */
-
- /* Byte 9 */
- cfblk->min_fr_len = ETH_ZLEN >> 2; /* Minimum frame length */
-
- /* Byte A */
- cfblk->lng_typ = 1; /* Type/length checks OFF */
- cfblk->lng_fld = 1; /* Disable 802.3 length field check */
- cfblk->rxcrc_xf = 1; /* Don't transfer CRC to memory */
- cfblk->artx = 1; /* Disable automatic retransmission */
- cfblk->sarec = 1; /* Disable source addr trig of CD */
- cfblk->tx_jabber = 0; /* Disable jabber jam sequence */
- cfblk->hash_1 = 1; /* Use bits 0-5 in mc address hash */
- cfblk->lbpkpol = 0; /* Loopback pin active high */
-
- /* Byte B */
- cfblk->fdx = 0; /* Disable full duplex operation */
-
- /* Byte C */
- cfblk->dummy_6 = 0x3f; /* all ones, Default multicast addresses & backoff. */
- cfblk->mult_ia = 0; /* No multiple individual addresses */
- cfblk->dis_bof = 0; /* Disable the backoff algorithm ?! */
-
- /* Byte D */
- cfblk->dummy_1 = 1; /* set to 1 */
- cfblk->tx_ifs_retrig = 3; /* Hmm... Disabled */
- cfblk->mc_all = (!netdev_mc_empty(dev) ||
- (dev->flags & IFF_ALLMULTI)); /* multicast all mode */
- cfblk->rcv_mon = 0; /* Monitor mode disabled */
- cfblk->frag_acpt = 0; /* Do not accept fragments */
- cfblk->tstrttrs = 0; /* No start transmission threshold */
-
- /* Byte E */
- cfblk->fretx = 1; /* FIFO automatic retransmission */
- cfblk->runt_eop = 0; /* drop "runt" packets */
- cfblk->hw_sw_pin = 0; /* ?? */
- cfblk->big_endn = 0; /* Big Endian ? no... */
- cfblk->syncrqs = 1; /* Synchronous DRQ deassertion... */
- cfblk->sttlen = 1; /* 6 byte status registers */
- cfblk->rx_eop = 0; /* Signal EOP on packet reception */
- cfblk->tx_eop = 0; /* Signal EOP on packet transmission */
-
- /* Byte F */
- cfblk->rbuf_size = RX_BUF_SIZE >> 12; /* Set receive buffer size */
- cfblk->rcvstop = 1; /* Enable Receive Stop Register */
-
- if (znet_debug > 2) {
- int i;
- unsigned char *c;
-
- for (i = 0, c = (char *) cfblk; i < sizeof (*cfblk); i++)
- printk ("%02X ", c[i]);
- printk ("\n");
- }
-
- *znet->tx_cur++ = sizeof(struct i82593_conf_block);
- memcpy(znet->tx_cur, cfblk, sizeof(struct i82593_conf_block));
- znet->tx_cur += sizeof(struct i82593_conf_block)/2;
- outb(OP0_CONFIGURE | CR0_CHNL, ioaddr);
-
- /* XXX FIXME maz : Add multicast addresses here, so having a
- * multicast address configured isn't equal to IFF_ALLMULTI */
-}
-
-static const struct net_device_ops znet_netdev_ops = {
- .ndo_open = znet_open,
- .ndo_stop = znet_close,
- .ndo_start_xmit = znet_send_packet,
- .ndo_set_rx_mode = znet_set_multicast_list,
- .ndo_tx_timeout = znet_tx_timeout,
- .ndo_change_mtu = eth_change_mtu,
- .ndo_set_mac_address = eth_mac_addr,
- .ndo_validate_addr = eth_validate_addr,
-};
-
-/* The Z-Note probe is pretty easy. The NETIDBLK exists in the safe-to-probe
- BIOS area. We just scan for the signature, and pull the vital parameters
- out of the structure. */
-
-static int __init znet_probe (void)
-{
- int i;
- struct netidblk *netinfo;
- struct znet_private *znet;
- struct net_device *dev;
- char *p;
- char *plast = phys_to_virt(0x100000 - NETIDBLK_MAGIC_SIZE);
- int err = -ENOMEM;
-
- /* This code scans the region 0xf0000 to 0xfffff for a "NETIDBLK". */
- for(p = (char *)phys_to_virt(0xf0000); p <= plast; p++)
- if (*p == 'N' &&
- strncmp(p, NETIDBLK_MAGIC, NETIDBLK_MAGIC_SIZE) == 0)
- break;
-
- if (p > plast) {
- if (znet_debug > 1)
- printk(KERN_INFO "No Z-Note ethernet adaptor found.\n");
- return -ENODEV;
- }
-
- dev = alloc_etherdev(sizeof(struct znet_private));
- if (!dev)
- return -ENOMEM;
-
- znet = netdev_priv(dev);
-
- netinfo = (struct netidblk *)p;
- dev->base_addr = netinfo->iobase1;
- dev->irq = netinfo->irq1;
-
- /* The station address is in the "netidblk" at 0x0f0000. */
- for (i = 0; i < 6; i++)
- dev->dev_addr[i] = netinfo->netid[i];
-
- printk(KERN_INFO "%s: ZNET at %#3lx, %pM"
- ", using IRQ %d DMA %d and %d.\n",
- dev->name, dev->base_addr, dev->dev_addr,
- dev->irq, netinfo->dma1, netinfo->dma2);
-
- if (znet_debug > 1) {
- printk(KERN_INFO "%s: vendor '%16.16s' IRQ1 %d IRQ2 %d DMA1 %d DMA2 %d.\n",
- dev->name, netinfo->vendor,
- netinfo->irq1, netinfo->irq2,
- netinfo->dma1, netinfo->dma2);
- printk(KERN_INFO "%s: iobase1 %#x size %d iobase2 %#x size %d net type %2.2x.\n",
- dev->name, netinfo->iobase1, netinfo->iosize1,
- netinfo->iobase2, netinfo->iosize2, netinfo->nettype);
- }
-
- if (znet_debug > 0)
- printk(KERN_INFO "%s", version);
-
- znet->rx_dma = netinfo->dma1;
- znet->tx_dma = netinfo->dma2;
- spin_lock_init(&znet->lock);
- znet->sia_base = 0xe6; /* Magic address for the 82501 SIA */
- znet->sia_size = 2;
- /* maz: Despite the '593 being advertised above as using a
- * single 8bits I/O port, this driver does many 16bits
- * access. So set io_size accordingly */
- znet->io_size = 2;
-
- if (!(znet->rx_start = kmalloc (DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA)))
- goto free_dev;
- if (!(znet->tx_start = kmalloc (DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA)))
- goto free_rx;
-
- if (!dma_page_eq (znet->rx_start, znet->rx_start + (RX_BUF_SIZE/2-1)) ||
- !dma_page_eq (znet->tx_start, znet->tx_start + (TX_BUF_SIZE/2-1))) {
- printk (KERN_WARNING "tx/rx crossing DMA frontiers, giving up\n");
- goto free_tx;
- }
-
- znet->rx_end = znet->rx_start + RX_BUF_SIZE/2;
- znet->tx_buf_len = TX_BUF_SIZE/2;
- znet->tx_end = znet->tx_start + znet->tx_buf_len;
-
- /* The ZNET-specific entries in the device structure. */
- dev->netdev_ops = &znet_netdev_ops;
- dev->watchdog_timeo = TX_TIMEOUT;
- err = register_netdev(dev);
- if (err)
- goto free_tx;
- znet_dev = dev;
- return 0;
-
- free_tx:
- kfree(znet->tx_start);
- free_rx:
- kfree(znet->rx_start);
- free_dev:
- free_netdev(dev);
- return err;
-}
-
-
-static int znet_open(struct net_device *dev)
-{
- int ioaddr = dev->base_addr;
-
- if (znet_debug > 2)
- printk(KERN_DEBUG "%s: znet_open() called.\n", dev->name);
-
- /* These should never fail. You can't add devices to a sealed box! */
- if (znet_request_resources (dev)) {
- printk(KERN_WARNING "%s: Not opened -- resource busy?!?\n", dev->name);
- return -EBUSY;
- }
-
- znet_transceiver_power (dev, 1);
-
- /* According to the Crynwr driver we should wait 50 msec. for the
- LAN clock to stabilize. My experiments indicates that the '593 can
- be initialized immediately. The delay is probably needed for the
- DC-to-DC converter to come up to full voltage, and for the oscillator
- to be spot-on at 20Mhz before transmitting.
- Until this proves to be a problem we rely on the higher layers for the
- delay and save allocating a timer entry. */
-
- /* maz : Well, I'm getting every time the following message
- * without the delay on a 486@33. This machine is much too
- * fast... :-) So maybe the Crynwr driver wasn't wrong after
- * all, even if the message is completly harmless on my
- * setup. */
- mdelay (50);
-
- /* This follows the packet driver's lead, and checks for success. */
- if (inb(ioaddr) != 0x10 && inb(ioaddr) != 0x00)
- printk(KERN_WARNING "%s: Problem turning on the transceiver power.\n",
- dev->name);
-
- hardware_init(dev);
- netif_start_queue (dev);
-
- return 0;
-}
-
-
-static void znet_tx_timeout (struct net_device *dev)
-{
- int ioaddr = dev->base_addr;
- ushort event, tx_status, rx_offset, state;
-
- outb (CR0_STATUS_0, ioaddr);
- event = inb (ioaddr);
- outb (CR0_STATUS_1, ioaddr);
- tx_status = inw (ioaddr);
- outb (CR0_STATUS_2, ioaddr);
- rx_offset = inw (ioaddr);
- outb (CR0_STATUS_3, ioaddr);
- state = inb (ioaddr);
- printk (KERN_WARNING "%s: transmit timed out, status %02x %04x %04x %02x,"
- " resetting.\n", dev->name, event, tx_status, rx_offset, state);
- if (tx_status == TX_LOST_CRS)
- printk (KERN_WARNING "%s: Tx carrier error, check transceiver cable.\n",
- dev->name);
- outb (OP0_RESET, ioaddr);
- hardware_init (dev);
- netif_wake_queue (dev);
-}
-
-static netdev_tx_t znet_send_packet(struct sk_buff *skb, struct net_device *dev)
-{
- int ioaddr = dev->base_addr;
- struct znet_private *znet = netdev_priv(dev);
- unsigned long flags;
- short length = skb->len;
-
- if (znet_debug > 4)
- printk(KERN_DEBUG "%s: ZNet_send_packet.\n", dev->name);
-
- if (length < ETH_ZLEN) {
- if (skb_padto(skb, ETH_ZLEN))
- return NETDEV_TX_OK;
- length = ETH_ZLEN;
- }
-
- netif_stop_queue (dev);
-
- /* Check that the part hasn't reset itself, probably from suspend. */
- outb(CR0_STATUS_0, ioaddr);
- if (inw(ioaddr) == 0x0010 &&
- inw(ioaddr) == 0x0000 &&
- inw(ioaddr) == 0x0010) {
- if (znet_debug > 1)
- printk (KERN_WARNING "%s : waking up\n", dev->name);
- hardware_init(dev);
- znet_transceiver_power (dev, 1);
- }
-
- if (1) {
- unsigned char *buf = (void *)skb->data;
- ushort *tx_link = znet->tx_cur - 1;
- ushort rnd_len = (length + 1)>>1;
-
- dev->stats.tx_bytes+=length;
-
- if (znet->tx_cur >= znet->tx_end)
- znet->tx_cur = znet->tx_start;
- *znet->tx_cur++ = length;
- if (znet->tx_cur + rnd_len + 1 > znet->tx_end) {
- int semi_cnt = (znet->tx_end - znet->tx_cur)<<1; /* Cvrt to byte cnt. */
- memcpy(znet->tx_cur, buf, semi_cnt);
- rnd_len -= semi_cnt>>1;
- memcpy(znet->tx_start, buf + semi_cnt, length - semi_cnt);
- znet->tx_cur = znet->tx_start + rnd_len;
- } else {
- memcpy(znet->tx_cur, buf, skb->len);
- znet->tx_cur += rnd_len;
- }
- *znet->tx_cur++ = 0;
-
- spin_lock_irqsave(&znet->lock, flags);
- {
- *tx_link = OP0_TRANSMIT | CR0_CHNL;
- /* Is this always safe to do? */
- outb(OP0_TRANSMIT | CR0_CHNL, ioaddr);
- }
- spin_unlock_irqrestore (&znet->lock, flags);
-
- netif_start_queue (dev);
-
- if (znet_debug > 4)
- printk(KERN_DEBUG "%s: Transmitter queued, length %d.\n", dev->name, length);
- }
- dev_kfree_skb(skb);
- return NETDEV_TX_OK;
-}
-
-/* The ZNET interrupt handler. */
-static irqreturn_t znet_interrupt(int irq, void *dev_id)
-{
- struct net_device *dev = dev_id;
- struct znet_private *znet = netdev_priv(dev);
- int ioaddr;
- int boguscnt = 20;
- int handled = 0;
-
- spin_lock (&znet->lock);
-
- ioaddr = dev->base_addr;
-
- outb(CR0_STATUS_0, ioaddr);
- do {
- ushort status = inb(ioaddr);
- if (znet_debug > 5) {
- ushort result, rx_ptr, running;
- outb(CR0_STATUS_1, ioaddr);
- result = inw(ioaddr);
- outb(CR0_STATUS_2, ioaddr);
- rx_ptr = inw(ioaddr);
- outb(CR0_STATUS_3, ioaddr);
- running = inb(ioaddr);
- printk(KERN_DEBUG "%s: interrupt, status %02x, %04x %04x %02x serial %d.\n",
- dev->name, status, result, rx_ptr, running, boguscnt);
- }
- if ((status & SR0_INTERRUPT) == 0)
- break;
-
- handled = 1;
-
- if ((status & SR0_EVENT_MASK) == SR0_TRANSMIT_DONE ||
- (status & SR0_EVENT_MASK) == SR0_RETRANSMIT_DONE ||
- (status & SR0_EVENT_MASK) == SR0_TRANSMIT_NO_CRC_DONE) {
- int tx_status;
- outb(CR0_STATUS_1, ioaddr);
- tx_status = inw(ioaddr);
- /* It's undocumented, but tx_status seems to match the i82586. */
- if (tx_status & TX_OK) {
- dev->stats.tx_packets++;
- dev->stats.collisions += tx_status & TX_NCOL_MASK;
- } else {
- if (tx_status & (TX_LOST_CTS | TX_LOST_CRS))
- dev->stats.tx_carrier_errors++;
- if (tx_status & TX_UND_RUN)
- dev->stats.tx_fifo_errors++;
- if (!(tx_status & TX_HRT_BEAT))
- dev->stats.tx_heartbeat_errors++;
- if (tx_status & TX_MAX_COL)
- dev->stats.tx_aborted_errors++;
- /* ...and the catch-all. */
- if ((tx_status | (TX_LOST_CRS | TX_LOST_CTS | TX_UND_RUN | TX_HRT_BEAT | TX_MAX_COL)) != (TX_LOST_CRS | TX_LOST_CTS | TX_UND_RUN | TX_HRT_BEAT | TX_MAX_COL))
- dev->stats.tx_errors++;
-
- /* Transceiver may be stuck if cable
- * was removed while emitting a
- * packet. Flip it off, then on to
- * reset it. This is very empirical,
- * but it seems to work. */
-
- znet_transceiver_power (dev, 0);
- znet_transceiver_power (dev, 1);
- }
- netif_wake_queue (dev);
- }
-
- if ((status & SR0_RECEPTION) ||
- (status & SR0_EVENT_MASK) == SR0_STOP_REG_HIT) {
- znet_rx(dev);
- }
- /* Clear the interrupts we've handled. */
- outb(CR0_INT_ACK, ioaddr);
- } while (boguscnt--);
-
- spin_unlock (&znet->lock);
-
- return IRQ_RETVAL(handled);
-}
-
-static void znet_rx(struct net_device *dev)
-{
- struct znet_private *znet = netdev_priv(dev);
- int ioaddr = dev->base_addr;
- int boguscount = 1;
- short next_frame_end_offset = 0; /* Offset of next frame start. */
- short *cur_frame_end;
- short cur_frame_end_offset;
-
- outb(CR0_STATUS_2, ioaddr);
- cur_frame_end_offset = inw(ioaddr);
-
- if (cur_frame_end_offset == znet->rx_cur - znet->rx_start) {
- printk(KERN_WARNING "%s: Interrupted, but nothing to receive, offset %03x.\n",
- dev->name, cur_frame_end_offset);
- return;
- }
-
- /* Use same method as the Crynwr driver: construct a forward list in
- the same area of the backwards links we now have. This allows us to
- pass packets to the upper layers in the order they were received --
- important for fast-path sequential operations. */
- while (znet->rx_start + cur_frame_end_offset != znet->rx_cur &&
- ++boguscount < 5) {
- unsigned short hi_cnt, lo_cnt, hi_status, lo_status;
- int count, status;
-
- if (cur_frame_end_offset < 4) {
- /* Oh no, we have a special case: the frame trailer wraps around
- the end of the ring buffer. We've saved space at the end of
- the ring buffer for just this problem. */
- memcpy(znet->rx_end, znet->rx_start, 8);
- cur_frame_end_offset += (RX_BUF_SIZE/2);
- }
- cur_frame_end = znet->rx_start + cur_frame_end_offset - 4;
-
- lo_status = *cur_frame_end++;
- hi_status = *cur_frame_end++;
- status = ((hi_status & 0xff) << 8) + (lo_status & 0xff);
- lo_cnt = *cur_frame_end++;
- hi_cnt = *cur_frame_end++;
- count = ((hi_cnt & 0xff) << 8) + (lo_cnt & 0xff);
-
- if (znet_debug > 5)
- printk(KERN_DEBUG "Constructing trailer at location %03x, %04x %04x %04x %04x"
- " count %#x status %04x.\n",
- cur_frame_end_offset<<1, lo_status, hi_status, lo_cnt, hi_cnt,
- count, status);
- cur_frame_end[-4] = status;
- cur_frame_end[-3] = next_frame_end_offset;
- cur_frame_end[-2] = count;
- next_frame_end_offset = cur_frame_end_offset;
- cur_frame_end_offset -= ((count + 1)>>1) + 3;
- if (cur_frame_end_offset < 0)
- cur_frame_end_offset += RX_BUF_SIZE/2;
- }
-
- /* Now step forward through the list. */
- do {
- ushort *this_rfp_ptr = znet->rx_start + next_frame_end_offset;
- int status = this_rfp_ptr[-4];
- int pkt_len = this_rfp_ptr[-2];
-
- if (znet_debug > 5)
- printk(KERN_DEBUG "Looking at trailer ending at %04x status %04x length %03x"
- " next %04x.\n", next_frame_end_offset<<1, status, pkt_len,
- this_rfp_ptr[-3]<<1);
- /* Once again we must assume that the i82586 docs apply. */
- if ( ! (status & RX_RCV_OK)) { /* There was an error. */
- dev->stats.rx_errors++;
- if (status & RX_CRC_ERR) dev->stats.rx_crc_errors++;
- if (status & RX_ALG_ERR) dev->stats.rx_frame_errors++;
-#if 0
- if (status & 0x0200) dev->stats.rx_over_errors++; /* Wrong. */
- if (status & 0x0100) dev->stats.rx_fifo_errors++;
-#else
- /* maz : Wild guess... */
- if (status & RX_OVRRUN) dev->stats.rx_over_errors++;
-#endif
- if (status & RX_SRT_FRM) dev->stats.rx_length_errors++;
- } else if (pkt_len > 1536) {
- dev->stats.rx_length_errors++;
- } else {
- /* Malloc up new buffer. */
- struct sk_buff *skb;
-
- skb = netdev_alloc_skb(dev, pkt_len);
- if (skb == NULL) {
- if (znet_debug)
- printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n", dev->name);
- dev->stats.rx_dropped++;
- break;
- }
-
- if (&znet->rx_cur[(pkt_len+1)>>1] > znet->rx_end) {
- int semi_cnt = (znet->rx_end - znet->rx_cur)<<1;
- memcpy(skb_put(skb,semi_cnt), znet->rx_cur, semi_cnt);
- memcpy(skb_put(skb,pkt_len-semi_cnt), znet->rx_start,
- pkt_len - semi_cnt);
- } else {
- memcpy(skb_put(skb,pkt_len), znet->rx_cur, pkt_len);
- if (znet_debug > 6) {
- unsigned int *packet = (unsigned int *) skb->data;
- printk(KERN_DEBUG "Packet data is %08x %08x %08x %08x.\n", packet[0],
- packet[1], packet[2], packet[3]);
- }
- }
- skb->protocol=eth_type_trans(skb,dev);
- netif_rx(skb);
- dev->stats.rx_packets++;
- dev->stats.rx_bytes += pkt_len;
- }
- znet->rx_cur = this_rfp_ptr;
- if (znet->rx_cur >= znet->rx_end)
- znet->rx_cur -= RX_BUF_SIZE/2;
- update_stop_hit(ioaddr, (znet->rx_cur - znet->rx_start)<<1);
- next_frame_end_offset = this_rfp_ptr[-3];
- if (next_frame_end_offset == 0) /* Read all the frames? */
- break; /* Done for now */
- this_rfp_ptr = znet->rx_start + next_frame_end_offset;
- } while (--boguscount);
-
- /* If any worth-while packets have been received, dev_rint()
- has done a mark_bh(INET_BH) for us and will work on them
- when we get to the bottom-half routine. */
-}
-
-/* The inverse routine to znet_open(). */
-static int znet_close(struct net_device *dev)
-{
- int ioaddr = dev->base_addr;
-
- netif_stop_queue (dev);
-
- outb(OP0_RESET, ioaddr); /* CMD0_RESET */
-
- if (znet_debug > 1)
- printk(KERN_DEBUG "%s: Shutting down ethercard.\n", dev->name);
- /* Turn off transceiver power. */
- znet_transceiver_power (dev, 0);
-
- znet_release_resources (dev);
-
- return 0;
-}
-
-static void show_dma(struct net_device *dev)
-{
- short ioaddr = dev->base_addr;
- unsigned char stat = inb (ioaddr);
- struct znet_private *znet = netdev_priv(dev);
- unsigned long flags;
- short dma_port = ((znet->tx_dma&3)<<2) + IO_DMA2_BASE;
- unsigned addr = inb(dma_port);
- short residue;
-
- addr |= inb(dma_port) << 8;
- residue = get_dma_residue(znet->tx_dma);
-
- if (znet_debug > 1) {
- flags=claim_dma_lock();
- printk(KERN_DEBUG "Stat:%02x Addr: %04x cnt:%3x\n",
- stat, addr<<1, residue);
- release_dma_lock(flags);
- }
-}
-
-/* Initialize the hardware. We have to do this when the board is open()ed
- or when we come out of suspend mode. */
-static void hardware_init(struct net_device *dev)
-{
- unsigned long flags;
- short ioaddr = dev->base_addr;
- struct znet_private *znet = netdev_priv(dev);
-
- znet->rx_cur = znet->rx_start;
- znet->tx_cur = znet->tx_start;
-
- /* Reset the chip, and start it up. */
- outb(OP0_RESET, ioaddr);
-
- flags=claim_dma_lock();
- disable_dma(znet->rx_dma); /* reset by an interrupting task. */
- clear_dma_ff(znet->rx_dma);
- set_dma_mode(znet->rx_dma, DMA_RX_MODE);
- set_dma_addr(znet->rx_dma, isa_virt_to_bus(znet->rx_start));
- set_dma_count(znet->rx_dma, RX_BUF_SIZE);
- enable_dma(znet->rx_dma);
- /* Now set up the Tx channel. */
- disable_dma(znet->tx_dma);
- clear_dma_ff(znet->tx_dma);
- set_dma_mode(znet->tx_dma, DMA_TX_MODE);
- set_dma_addr(znet->tx_dma, isa_virt_to_bus(znet->tx_start));
- set_dma_count(znet->tx_dma, znet->tx_buf_len<<1);
- enable_dma(znet->tx_dma);
- release_dma_lock(flags);
-
- if (znet_debug > 1)
- printk(KERN_DEBUG "%s: Initializing the i82593, rx buf %p tx buf %p\n",
- dev->name, znet->rx_start,znet->tx_start);
- /* Do an empty configure command, just like the Crynwr driver. This
- resets to chip to its default values. */
- *znet->tx_cur++ = 0;
- *znet->tx_cur++ = 0;
- show_dma(dev);
- outb(OP0_CONFIGURE | CR0_CHNL, ioaddr);
-
- znet_set_multicast_list (dev);
-
- *znet->tx_cur++ = 6;
- memcpy(znet->tx_cur, dev->dev_addr, 6);
- znet->tx_cur += 3;
- show_dma(dev);
- outb(OP0_IA_SETUP | CR0_CHNL, ioaddr);
- show_dma(dev);
-
- update_stop_hit(ioaddr, 8192);
- if (znet_debug > 1) printk(KERN_DEBUG "enabling Rx.\n");
- outb(OP0_RCV_ENABLE, ioaddr);
- netif_start_queue (dev);
-}
-
-static void update_stop_hit(short ioaddr, unsigned short rx_stop_offset)
-{
- outb(OP0_SWIT_TO_PORT_1 | CR0_CHNL, ioaddr);
- if (znet_debug > 5)
- printk(KERN_DEBUG "Updating stop hit with value %02x.\n",
- (rx_stop_offset >> 6) | CR1_STOP_REG_UPDATE);
- outb((rx_stop_offset >> 6) | CR1_STOP_REG_UPDATE, ioaddr);
- outb(OP1_SWIT_TO_PORT_0, ioaddr);
-}
-
-static __exit void znet_cleanup (void)
-{
- if (znet_dev) {
- struct znet_private *znet = netdev_priv(znet_dev);
-
- unregister_netdev (znet_dev);
- kfree (znet->rx_start);
- kfree (znet->tx_start);
- free_netdev (znet_dev);
- }
-}
-
-module_init (znet_probe);
-module_exit (znet_cleanup);
projects / mirror_ubuntu-eoan-kernel.git / commitdiff