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dm9000.c

/*
 *   dm9000.c: Version 1.2 03/18/2003
 *
 *         A Davicom DM9000 ISA NIC fast Ethernet driver for Linux.
 *    Copyright (C) 1997  Sten Wang
 *
 *    This program is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU General Public License
 *    as published by the Free Software Foundation; either version 2
 *    of the License, or (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *   (C)Copyright 1997-1998 DAVICOM Semiconductor,Inc. All Rights Reserved.
 *
 * V0.11    06/20/2001  REG_0A bit3=1, default enable BP with DA match
 *    06/22/2001  Support DM9801 progrmming
 *                E3: R25 = ((R24 + NF) & 0x00ff) | 0xf000
 *                E4: R25 = ((R24 + NF) & 0x00ff) | 0xc200
 *                      R17 = (R17 & 0xfff0) | NF + 3
 *                E5: R25 = ((R24 + NF - 3) & 0x00ff) | 0xc200
 *                      R17 = (R17 & 0xfff0) | NF
 *
 * v1.00                modify by simon 2001.9.5
 *                         change for kernel 2.4.x
 *
 * v1.1   11/09/2001          fix force mode bug
 *
 * v1.2   03/18/2003       Weilun Huang <weilun_huang@davicom.com.tw>:
 *                Fixed phy reset.
 *                Added tx/rx 32 bit mode.
 *                Cleaned up for kernel merge.
 *
 *        03/03/2004    Sascha Hauer <s.hauer@pengutronix.de>
 *                      Port to 2.6 kernel
 *
 *      24-Sep-2004   Ben Dooks <ben@simtec.co.uk>
 *                Cleanup of code to remove ifdefs
 *                Allowed platform device data to influence access width
 *                Reformatting areas of code
 *
 *        17-Mar-2005   Sascha Hauer <s.hauer@pengutronix.de>
 *                      * removed 2.4 style module parameters
 *                      * removed removed unused stat counter and fixed
 *                        net_device_stats
 *                      * introduced tx_timeout function
 *                      * reworked locking
 *
 *      01-Jul-2005   Ben Dooks <ben@simtec.co.uk>
 *                * fixed spinlock call without pointer
 *                * ensure spinlock is initialised
 */

#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/crc32.h>
#include <linux/mii.h>
#include <linux/dm9000.h>
#include <linux/delay.h>
#include <linux/platform_device.h>

#include <asm/delay.h>
#include <asm/irq.h>
#include <asm/io.h>

#include "dm9000.h"

/* Board/System/Debug information/definition ---------------- */

#define DM9000_PHY            0x40  /* PHY address 0x01 */

#define CARDNAME "dm9000"
#define PFX CARDNAME ": "

#define DM9000_TIMER_WUT  jiffies+(HZ*2)  /* timer wakeup time : 2 second */

#define DM9000_DEBUG 0

#if DM9000_DEBUG > 2
#define PRINTK3(args...)  printk(CARDNAME ": " args)
#else
#define PRINTK3(args...)  do { } while(0)
#endif

#if DM9000_DEBUG > 1
#define PRINTK2(args...)  printk(CARDNAME ": " args)
#else
#define PRINTK2(args...)  do { } while(0)
#endif

#if DM9000_DEBUG > 0
#define PRINTK1(args...)  printk(CARDNAME ": " args)
#define PRINTK(args...)   printk(CARDNAME ": " args)
#else
#define PRINTK1(args...)  do { } while(0)
#define PRINTK(args...)   printk(KERN_DEBUG args)
#endif

#ifdef CONFIG_BLACKFIN
#define readsb    insb
#define readsw    insw
#define readsl    insl
#define writesb   outsb
#define writesw   outsw
#define writesl   outsl
#define DM9000_IRQ_FLAGS      (IRQF_SHARED | IRQF_TRIGGER_HIGH)
#else
#define DM9000_IRQ_FLAGS      IRQF_SHARED
#endif

/*
 * Transmit timeout, default 5 seconds.
 */
static int watchdog = 5000;
module_param(watchdog, int, 0400);
MODULE_PARM_DESC(watchdog, "transmit timeout in milliseconds");

/* Structure/enum declaration ------------------------------- */
typedef struct board_info {

      void __iomem *io_addr;  /* Register I/O base address */
      void __iomem *io_data;  /* Data I/O address */
      u16 irq;          /* IRQ */

      u16 tx_pkt_cnt;
      u16 queue_pkt_len;
      u16 queue_start_addr;
      u16 dbug_cnt;
      u8 io_mode;       /* 0:word, 2:byte */
      u8 phy_addr;

      void (*inblk)(void __iomem *port, void *data, int length);
      void (*outblk)(void __iomem *port, void *data, int length);
      void (*dumpblk)(void __iomem *port, int length);

      struct resource   *addr_res;   /* resources found */
      struct resource *data_res;
      struct resource   *addr_req;   /* resources requested */
      struct resource *data_req;
      struct resource *irq_res;

      struct timer_list timer;
      unsigned char srom[128];
      spinlock_t lock;

      struct mii_if_info mii;
      u32 msg_enable;
} board_info_t;

/* function declaration ------------------------------------- */
static int dm9000_probe(struct platform_device *);
static int dm9000_open(struct net_device *);
static int dm9000_start_xmit(struct sk_buff *, struct net_device *);
static int dm9000_stop(struct net_device *);


static void dm9000_timer(unsigned long);
static void dm9000_init_dm9000(struct net_device *);

static irqreturn_t dm9000_interrupt(int, void *);

static int dm9000_phy_read(struct net_device *dev, int phyaddr_unsused, int reg);
static void dm9000_phy_write(struct net_device *dev, int phyaddr_unused, int reg,
                     int value);
static u16 read_srom_word(board_info_t *, int);
static void dm9000_rx(struct net_device *);
static void dm9000_hash_table(struct net_device *);

//#define DM9000_PROGRAM_EEPROM
#ifdef DM9000_PROGRAM_EEPROM
static void program_eeprom(board_info_t * db);
#endif
/* DM9000 network board routine ---------------------------- */

static void
dm9000_reset(board_info_t * db)
{
      PRINTK1("dm9000x: resetting\n");
      /* RESET device */
      writeb(DM9000_NCR, db->io_addr);
      udelay(200);
      writeb(NCR_RST, db->io_data);
      udelay(200);
}

/*
 *   Read a byte from I/O port
 */
static u8
ior(board_info_t * db, int reg)
{
      writeb(reg, db->io_addr);
      return readb(db->io_data);
}

/*
 *   Write a byte to I/O port
 */

static void
iow(board_info_t * db, int reg, int value)
{
      writeb(reg, db->io_addr);
      writeb(value, db->io_data);
}

/* routines for sending block to chip */

static void dm9000_outblk_8bit(void __iomem *reg, void *data, int count)
{
      writesb(reg, data, count);
}

static void dm9000_outblk_16bit(void __iomem *reg, void *data, int count)
{
      writesw(reg, data, (count+1) >> 1);
}

static void dm9000_outblk_32bit(void __iomem *reg, void *data, int count)
{
      writesl(reg, data, (count+3) >> 2);
}

/* input block from chip to memory */

static void dm9000_inblk_8bit(void __iomem *reg, void *data, int count)
{
      readsb(reg, data, count);
}


static void dm9000_inblk_16bit(void __iomem *reg, void *data, int count)
{
      readsw(reg, data, (count+1) >> 1);
}

static void dm9000_inblk_32bit(void __iomem *reg, void *data, int count)
{
      readsl(reg, data, (count+3) >> 2);
}

/* dump block from chip to null */

static void dm9000_dumpblk_8bit(void __iomem *reg, int count)
{
      int i;
      int tmp;

      for (i = 0; i < count; i++)
            tmp = readb(reg);
}

static void dm9000_dumpblk_16bit(void __iomem *reg, int count)
{
      int i;
      int tmp;

      count = (count + 1) >> 1;

      for (i = 0; i < count; i++)
            tmp = readw(reg);
}

static void dm9000_dumpblk_32bit(void __iomem *reg, int count)
{
      int i;
      int tmp;

      count = (count + 3) >> 2;

      for (i = 0; i < count; i++)
            tmp = readl(reg);
}

/* dm9000_set_io
 *
 * select the specified set of io routines to use with the
 * device
 */

static void dm9000_set_io(struct board_info *db, int byte_width)
{
      /* use the size of the data resource to work out what IO
       * routines we want to use
       */

      switch (byte_width) {
      case 1:
            db->dumpblk = dm9000_dumpblk_8bit;
            db->outblk  = dm9000_outblk_8bit;
            db->inblk   = dm9000_inblk_8bit;
            break;

      case 2:
            db->dumpblk = dm9000_dumpblk_16bit;
            db->outblk  = dm9000_outblk_16bit;
            db->inblk   = dm9000_inblk_16bit;
            break;

      case 3:
            printk(KERN_ERR PFX ": 3 byte IO, falling back to 16bit\n");
            db->dumpblk = dm9000_dumpblk_16bit;
            db->outblk  = dm9000_outblk_16bit;
            db->inblk   = dm9000_inblk_16bit;
            break;

      case 4:
      default:
            db->dumpblk = dm9000_dumpblk_32bit;
            db->outblk  = dm9000_outblk_32bit;
            db->inblk   = dm9000_inblk_32bit;
            break;
      }
}


/* Our watchdog timed out. Called by the networking layer */
static void dm9000_timeout(struct net_device *dev)
{
      board_info_t *db = (board_info_t *) dev->priv;
      u8 reg_save;
      unsigned long flags;

      /* Save previous register address */
      reg_save = readb(db->io_addr);
      spin_lock_irqsave(&db->lock,flags);

      netif_stop_queue(dev);
      dm9000_reset(db);
      dm9000_init_dm9000(dev);
      /* We can accept TX packets again */
      dev->trans_start = jiffies;
      netif_wake_queue(dev);

      /* Restore previous register address */
      writeb(reg_save, db->io_addr);
      spin_unlock_irqrestore(&db->lock,flags);
}

#ifdef CONFIG_NET_POLL_CONTROLLER
/*
 *Used by netconsole
 */
static void dm9000_poll_controller(struct net_device *dev)
{
      disable_irq(dev->irq);
      dm9000_interrupt(dev->irq,dev);
      enable_irq(dev->irq);
}
#endif

/* dm9000_release_board
 *
 * release a board, and any mapped resources
 */

static void
dm9000_release_board(struct platform_device *pdev, struct board_info *db)
{
      if (db->data_res == NULL) {
            if (db->addr_res != NULL)
                  release_mem_region((unsigned long)db->io_addr, 4);
            return;
      }

      /* unmap our resources */

      iounmap(db->io_addr);
      iounmap(db->io_data);

      /* release the resources */

      if (db->data_req != NULL) {
            release_resource(db->data_req);
            kfree(db->data_req);
      }

      if (db->addr_req != NULL) {
            release_resource(db->addr_req);
            kfree(db->addr_req);
      }
}

#define res_size(_r) (((_r)->end - (_r)->start) + 1)

/*
 * Search DM9000 board, allocate space and register it
 */
static int
dm9000_probe(struct platform_device *pdev)
{
      struct dm9000_plat_data *pdata = pdev->dev.platform_data;
      struct board_info *db;  /* Point a board information structure */
      struct net_device *ndev;
      unsigned long base;
      int ret = 0;
      int iosize;
      int i;
      u32 id_val;

      /* Init network device */
      ndev = alloc_etherdev(sizeof (struct board_info));
      if (!ndev) {
            printk("%s: could not allocate device.\n", CARDNAME);
            return -ENOMEM;
      }

      SET_NETDEV_DEV(ndev, &pdev->dev);

      PRINTK2("dm9000_probe()");

      /* setup board info structure */
      db = (struct board_info *) ndev->priv;
      memset(db, 0, sizeof (*db));

      spin_lock_init(&db->lock);

      if (pdev->num_resources < 2) {
            ret = -ENODEV;
            goto out;
      } else if (pdev->num_resources == 2) {
            base = pdev->resource[0].start;

            if (!request_mem_region(base, 4, ndev->name)) {
                  ret = -EBUSY;
                  goto out;
            }

            ndev->base_addr = base;
            ndev->irq = pdev->resource[1].start;
            db->io_addr = (void __iomem *)base;
            db->io_data = (void __iomem *)(base + 4);

            /* ensure at least we have a default set of IO routines */
            dm9000_set_io(db, 2);

      } else {
            db->addr_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
            db->data_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
            db->irq_res  = platform_get_resource(pdev, IORESOURCE_IRQ, 0);

            if (db->addr_res == NULL || db->data_res == NULL ||
                db->irq_res == NULL) {
                  printk(KERN_ERR PFX "insufficient resources\n");
                  ret = -ENOENT;
                  goto out;
            }

            i = res_size(db->addr_res);
            db->addr_req = request_mem_region(db->addr_res->start, i,
                                      pdev->name);

            if (db->addr_req == NULL) {
                  printk(KERN_ERR PFX "cannot claim address reg area\n");
                  ret = -EIO;
                  goto out;
            }

            db->io_addr = ioremap(db->addr_res->start, i);

            if (db->io_addr == NULL) {
                  printk(KERN_ERR "failed to ioremap address reg\n");
                  ret = -EINVAL;
                  goto out;
            }

            iosize = res_size(db->data_res);
            db->data_req = request_mem_region(db->data_res->start, iosize,
                                      pdev->name);

            if (db->data_req == NULL) {
                  printk(KERN_ERR PFX "cannot claim data reg area\n");
                  ret = -EIO;
                  goto out;
            }

            db->io_data = ioremap(db->data_res->start, iosize);

            if (db->io_data == NULL) {
                  printk(KERN_ERR "failed to ioremap data reg\n");
                  ret = -EINVAL;
                  goto out;
            }

            /* fill in parameters for net-dev structure */

            ndev->base_addr = (unsigned long)db->io_addr;
            ndev->irq   = db->irq_res->start;

            /* ensure at least we have a default set of IO routines */
            dm9000_set_io(db, iosize);
      }

      /* check to see if anything is being over-ridden */
      if (pdata != NULL) {
            /* check to see if the driver wants to over-ride the
             * default IO width */

            if (pdata->flags & DM9000_PLATF_8BITONLY)
                  dm9000_set_io(db, 1);

            if (pdata->flags & DM9000_PLATF_16BITONLY)
                  dm9000_set_io(db, 2);

            if (pdata->flags & DM9000_PLATF_32BITONLY)
                  dm9000_set_io(db, 4);

            /* check to see if there are any IO routine
             * over-rides */

            if (pdata->inblk != NULL)
                  db->inblk = pdata->inblk;

            if (pdata->outblk != NULL)
                  db->outblk = pdata->outblk;

            if (pdata->dumpblk != NULL)
                  db->dumpblk = pdata->dumpblk;
      }

      dm9000_reset(db);

      /* try two times, DM9000 sometimes gets the first read wrong */
      for (i = 0; i < 2; i++) {
            id_val  = ior(db, DM9000_VIDL);
            id_val |= (u32)ior(db, DM9000_VIDH) << 8;
            id_val |= (u32)ior(db, DM9000_PIDL) << 16;
            id_val |= (u32)ior(db, DM9000_PIDH) << 24;

            if (id_val == DM9000_ID)
                  break;
            printk("%s: read wrong id 0x%08x\n", CARDNAME, id_val);
      }

      if (id_val != DM9000_ID) {
            printk("%s: wrong id: 0x%08x\n", CARDNAME, id_val);
            ret = -ENODEV;
            goto out;
      }

      /* from this point we assume that we have found a DM9000 */

      /* driver system function */
      ether_setup(ndev);

      ndev->open         = &dm9000_open;
      ndev->hard_start_xmit    = &dm9000_start_xmit;
      ndev->tx_timeout         = &dm9000_timeout;
      ndev->watchdog_timeo = msecs_to_jiffies(watchdog);
      ndev->stop         = &dm9000_stop;
      ndev->set_multicast_list = &dm9000_hash_table;
#ifdef CONFIG_NET_POLL_CONTROLLER
      ndev->poll_controller    = &dm9000_poll_controller;
#endif

#ifdef DM9000_PROGRAM_EEPROM
      program_eeprom(db);
#endif
      db->msg_enable       = NETIF_MSG_LINK;
      db->mii.phy_id_mask  = 0x1f;
      db->mii.reg_num_mask = 0x1f;
      db->mii.force_media  = 0;
      db->mii.full_duplex  = 0;
      db->mii.dev      = ndev;
      db->mii.mdio_read    = dm9000_phy_read;
      db->mii.mdio_write   = dm9000_phy_write;

      /* Read SROM content */
      for (i = 0; i < 64; i++)
            ((u16 *) db->srom)[i] = read_srom_word(db, i);

      /* Set Node Address */
      for (i = 0; i < 6; i++)
            ndev->dev_addr[i] = db->srom[i];

      if (!is_valid_ether_addr(ndev->dev_addr)) {
            /* try reading from mac */

            for (i = 0; i < 6; i++)
                  ndev->dev_addr[i] = ior(db, i+DM9000_PAR);
      }

      if (!is_valid_ether_addr(ndev->dev_addr))
            printk("%s: Invalid ethernet MAC address.  Please "
                   "set using ifconfig\n", ndev->name);

      platform_set_drvdata(pdev, ndev);
      ret = register_netdev(ndev);

      if (ret == 0) {
            DECLARE_MAC_BUF(mac);
            printk("%s: dm9000 at %p,%p IRQ %d MAC: %s\n",
                   ndev->name,  db->io_addr, db->io_data, ndev->irq,
                   print_mac(mac, ndev->dev_addr));
      }
      return 0;

out:
      printk("%s: not found (%d).\n", CARDNAME, ret);

      dm9000_release_board(pdev, db);
      free_netdev(ndev);

      return ret;
}

/*
 *  Open the interface.
 *  The interface is opened whenever "ifconfig" actives it.
 */
static int
dm9000_open(struct net_device *dev)
{
      board_info_t *db = (board_info_t *) dev->priv;

      PRINTK2("entering dm9000_open\n");

      if (request_irq(dev->irq, &dm9000_interrupt, DM9000_IRQ_FLAGS, dev->name, dev))
            return -EAGAIN;

      /* Initialize DM9000 board */
      dm9000_reset(db);
      dm9000_init_dm9000(dev);

      /* Init driver variable */
      db->dbug_cnt = 0;

      /* set and active a timer process */
      init_timer(&db->timer);
      db->timer.expires  = DM9000_TIMER_WUT;
      db->timer.data     = (unsigned long) dev;
      db->timer.function = &dm9000_timer;
      add_timer(&db->timer);

      mii_check_media(&db->mii, netif_msg_link(db), 1);
      netif_start_queue(dev);

      return 0;
}

/*
 * Initilize dm9000 board
 */
static void
dm9000_init_dm9000(struct net_device *dev)
{
      board_info_t *db = (board_info_t *) dev->priv;

      PRINTK1("entering %s\n",__FUNCTION__);

      /* I/O mode */
      db->io_mode = ior(db, DM9000_ISR) >> 6;   /* ISR bit7:6 keeps I/O mode */

      /* GPIO0 on pre-activate PHY */
      iow(db, DM9000_GPR, 0); /* REG_1F bit0 activate phyxcer */
      iow(db, DM9000_GPCR, GPCR_GEP_CNTL);      /* Let GPIO0 output */
      iow(db, DM9000_GPR, 0); /* Enable PHY */

      /* Program operating register */
      iow(db, DM9000_TCR, 0);         /* TX Polling clear */
      iow(db, DM9000_BPTR, 0x3f);   /* Less 3Kb, 200us */
      iow(db, DM9000_FCR, 0xff);    /* Flow Control */
      iow(db, DM9000_SMCR, 0);        /* Special Mode */
      /* clear TX status */
      iow(db, DM9000_NSR, NSR_WAKEST | NSR_TX2END | NSR_TX1END);
      iow(db, DM9000_ISR, ISR_CLR_STATUS); /* Clear interrupt status */

      /* Set address filter table */
      dm9000_hash_table(dev);

      /* Activate DM9000 */
      iow(db, DM9000_RCR, RCR_DIS_LONG | RCR_DIS_CRC | RCR_RXEN);
      /* Enable TX/RX interrupt mask */
      iow(db, DM9000_IMR, IMR_PAR | IMR_PTM | IMR_PRM);

      /* Init Driver variable */
      db->tx_pkt_cnt = 0;
      db->queue_pkt_len = 0;
      dev->trans_start = 0;
}

/*
 *  Hardware start transmission.
 *  Send a packet to media from the upper layer.
 */
static int
dm9000_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
      unsigned long flags;
      board_info_t *db = (board_info_t *) dev->priv;

      PRINTK3("dm9000_start_xmit\n");

      if (db->tx_pkt_cnt > 1)
            return 1;

      spin_lock_irqsave(&db->lock, flags);

      /* Move data to DM9000 TX RAM */
      writeb(DM9000_MWCMD, db->io_addr);

      (db->outblk)(db->io_data, skb->data, skb->len);
      dev->stats.tx_bytes += skb->len;

      db->tx_pkt_cnt++;
      /* TX control: First packet immediately send, second packet queue */
      if (db->tx_pkt_cnt == 1) {
            /* Set TX length to DM9000 */
            iow(db, DM9000_TXPLL, skb->len & 0xff);
            iow(db, DM9000_TXPLH, (skb->len >> 8) & 0xff);

            /* Issue TX polling command */
            iow(db, DM9000_TCR, TCR_TXREQ);     /* Cleared after TX complete */

            dev->trans_start = jiffies;   /* save the time stamp */
      } else {
            /* Second packet */
            db->queue_pkt_len = skb->len;
            netif_stop_queue(dev);
      }

      spin_unlock_irqrestore(&db->lock, flags);

      /* free this SKB */
      dev_kfree_skb(skb);

      return 0;
}

static void
dm9000_shutdown(struct net_device *dev)
{
      board_info_t *db = (board_info_t *) dev->priv;

      /* RESET device */
      dm9000_phy_write(dev, 0, MII_BMCR, BMCR_RESET); /* PHY RESET */
      iow(db, DM9000_GPR, 0x01);    /* Power-Down PHY */
      iow(db, DM9000_IMR, IMR_PAR); /* Disable all interrupt */
      iow(db, DM9000_RCR, 0x00);    /* Disable RX */
}

/*
 * Stop the interface.
 * The interface is stopped when it is brought.
 */
static int
dm9000_stop(struct net_device *ndev)
{
      board_info_t *db = (board_info_t *) ndev->priv;

      PRINTK1("entering %s\n",__FUNCTION__);

      /* deleted timer */
      del_timer(&db->timer);

      netif_stop_queue(ndev);
      netif_carrier_off(ndev);

      /* free interrupt */
      free_irq(ndev->irq, ndev);

      dm9000_shutdown(ndev);

      return 0;
}

/*
 * DM9000 interrupt handler
 * receive the packet to upper layer, free the transmitted packet
 */

static void
dm9000_tx_done(struct net_device *dev, board_info_t * db)
{
      int tx_status = ior(db, DM9000_NSR);      /* Got TX status */

      if (tx_status & (NSR_TX2END | NSR_TX1END)) {
            /* One packet sent complete */
            db->tx_pkt_cnt--;
            dev->stats.tx_packets++;

            /* Queue packet check & send */
            if (db->tx_pkt_cnt > 0) {
                  iow(db, DM9000_TXPLL, db->queue_pkt_len & 0xff);
                  iow(db, DM9000_TXPLH, (db->queue_pkt_len >> 8) & 0xff);
                  iow(db, DM9000_TCR, TCR_TXREQ);
                  dev->trans_start = jiffies;
            }
            netif_wake_queue(dev);
      }
}

static irqreturn_t
dm9000_interrupt(int irq, void *dev_id)
{
      struct net_device *dev = dev_id;
      board_info_t *db;
      int int_status;
      u8 reg_save;

      PRINTK3("entering %s\n",__FUNCTION__);

      if (!dev) {
            PRINTK1("dm9000_interrupt() without DEVICE arg\n");
            return IRQ_HANDLED;
      }

      /* A real interrupt coming */
      db = (board_info_t *) dev->priv;
      spin_lock(&db->lock);

      /* Save previous register address */
      reg_save = readb(db->io_addr);

      /* Disable all interrupts */
      iow(db, DM9000_IMR, IMR_PAR);

      /* Got DM9000 interrupt status */
      int_status = ior(db, DM9000_ISR);   /* Got ISR */
      iow(db, DM9000_ISR, int_status);    /* Clear ISR status */

      /* Received the coming packet */
      if (int_status & ISR_PRS)
            dm9000_rx(dev);

      /* Trnasmit Interrupt check */
      if (int_status & ISR_PTS)
            dm9000_tx_done(dev, db);

      /* Re-enable interrupt mask */
      iow(db, DM9000_IMR, IMR_PAR | IMR_PTM | IMR_PRM);

      /* Restore previous register address */
      writeb(reg_save, db->io_addr);

      spin_unlock(&db->lock);

      return IRQ_HANDLED;
}

/*
 *  A periodic timer routine
 *  Dynamic media sense, allocated Rx buffer...
 */
static void
dm9000_timer(unsigned long data)
{
      struct net_device *dev = (struct net_device *) data;
      board_info_t *db = (board_info_t *) dev->priv;

      PRINTK3("dm9000_timer()\n");

      mii_check_media(&db->mii, netif_msg_link(db), 0);

      /* Set timer again */
      db->timer.expires = DM9000_TIMER_WUT;
      add_timer(&db->timer);
}

struct dm9000_rxhdr {
      u16   RxStatus;
      u16   RxLen;
} __attribute__((__packed__));

/*
 *  Received a packet and pass to upper layer
 */
static void
dm9000_rx(struct net_device *dev)
{
      board_info_t *db = (board_info_t *) dev->priv;
      struct dm9000_rxhdr rxhdr;
      struct sk_buff *skb;
      u8 rxbyte, *rdptr;
      bool GoodPacket;
      int RxLen;

      /* Check packet ready or not */
      do {
            ior(db, DM9000_MRCMDX); /* Dummy read */

            /* Get most updated data */
            rxbyte = readb(db->io_data);

            /* Status check: this byte must be 0 or 1 */
            if (rxbyte > DM9000_PKT_RDY) {
                  printk("status check failed: %d\n", rxbyte);
                  iow(db, DM9000_RCR, 0x00);    /* Stop Device */
                  iow(db, DM9000_ISR, IMR_PAR); /* Stop INT request */
                  return;
            }

            if (rxbyte != DM9000_PKT_RDY)
                  return;

            /* A packet ready now  & Get status/length */
            GoodPacket = true;
            writeb(DM9000_MRCMD, db->io_addr);

            (db->inblk)(db->io_data, &rxhdr, sizeof(rxhdr));

            RxLen = rxhdr.RxLen;

            /* Packet Status check */
            if (RxLen < 0x40) {
                  GoodPacket = false;
                  PRINTK1("Bad Packet received (runt)\n");
            }

            if (RxLen > DM9000_PKT_MAX) {
                  PRINTK1("RST: RX Len:%x\n", RxLen);
            }

            if (rxhdr.RxStatus & 0xbf00) {
                  GoodPacket = false;
                  if (rxhdr.RxStatus & 0x100) {
                        PRINTK1("fifo error\n");
                        dev->stats.rx_fifo_errors++;
                  }
                  if (rxhdr.RxStatus & 0x200) {
                        PRINTK1("crc error\n");
                        dev->stats.rx_crc_errors++;
                  }
                  if (rxhdr.RxStatus & 0x8000) {
                        PRINTK1("length error\n");
                        dev->stats.rx_length_errors++;
                  }
            }

            /* Move data from DM9000 */
            if (GoodPacket
                && ((skb = dev_alloc_skb(RxLen + 4)) != NULL)) {
                  skb_reserve(skb, 2);
                  rdptr = (u8 *) skb_put(skb, RxLen - 4);

                  /* Read received packet from RX SRAM */

                  (db->inblk)(db->io_data, rdptr, RxLen);
                  dev->stats.rx_bytes += RxLen;

                  /* Pass to upper layer */
                  skb->protocol = eth_type_trans(skb, dev);
                  netif_rx(skb);
                  dev->stats.rx_packets++;

            } else {
                  /* need to dump the packet's data */

                  (db->dumpblk)(db->io_data, RxLen);
            }
      } while (rxbyte == DM9000_PKT_RDY);
}

/*
 *  Read a word data from SROM
 */
static u16
read_srom_word(board_info_t * db, int offset)
{
      iow(db, DM9000_EPAR, offset);
      iow(db, DM9000_EPCR, EPCR_ERPRR);
      mdelay(8);        /* according to the datasheet 200us should be enough,
                           but it doesn't work */
      iow(db, DM9000_EPCR, 0x0);
      return (ior(db, DM9000_EPDRL) + (ior(db, DM9000_EPDRH) << 8));
}

#ifdef DM9000_PROGRAM_EEPROM
/*
 * Write a word data to SROM
 */
static void
write_srom_word(board_info_t * db, int offset, u16 val)
{
      iow(db, DM9000_EPAR, offset);
      iow(db, DM9000_EPDRH, ((val >> 8) & 0xff));
      iow(db, DM9000_EPDRL, (val & 0xff));
      iow(db, DM9000_EPCR, EPCR_WEP | EPCR_ERPRW);
      mdelay(8);        /* same shit */
      iow(db, DM9000_EPCR, 0);
}

/*
 * Only for development:
 * Here we write static data to the eeprom in case
 * we don't have valid content on a new board
 */
static void
program_eeprom(board_info_t * db)
{
      u16 eeprom[] = { 0x0c00, 0x007f, 0x1300,  /* MAC Address */
            0x0000,           /* Autoload: accept nothing */
            0x0a46, 0x9000,   /* Vendor / Product ID */
            0x0000,           /* pin control */
            0x0000,
      };                /* Wake-up mode control */
      int i;
      for (i = 0; i < 8; i++)
            write_srom_word(db, i, eeprom[i]);
}
#endif


/*
 *  Calculate the CRC valude of the Rx packet
 *  flag = 1 : return the reverse CRC (for the received packet CRC)
 *         0 : return the normal CRC (for Hash Table index)
 */

static unsigned long
cal_CRC(unsigned char *Data, unsigned int Len, u8 flag)
{

       u32 crc = ether_crc_le(Len, Data);

       if (flag)
               return ~crc;

       return crc;
}

/*
 *  Set DM9000 multicast address
 */
static void
dm9000_hash_table(struct net_device *dev)
{
      board_info_t *db = (board_info_t *) dev->priv;
      struct dev_mc_list *mcptr = dev->mc_list;
      int mc_cnt = dev->mc_count;
      u32 hash_val;
      u16 i, oft, hash_table[4];
      unsigned long flags;

      PRINTK2("dm9000_hash_table()\n");

      spin_lock_irqsave(&db->lock,flags);

      for (i = 0, oft = 0x10; i < 6; i++, oft++)
            iow(db, oft, dev->dev_addr[i]);

      /* Clear Hash Table */
      for (i = 0; i < 4; i++)
            hash_table[i] = 0x0;

      /* broadcast address */
      hash_table[3] = 0x8000;

      /* the multicast address in Hash Table : 64 bits */
      for (i = 0; i < mc_cnt; i++, mcptr = mcptr->next) {
            hash_val = cal_CRC((char *) mcptr->dmi_addr, 6, 0) & 0x3f;
            hash_table[hash_val / 16] |= (u16) 1 << (hash_val % 16);
      }

      /* Write the hash table to MAC MD table */
      for (i = 0, oft = 0x16; i < 4; i++) {
            iow(db, oft++, hash_table[i] & 0xff);
            iow(db, oft++, (hash_table[i] >> 8) & 0xff);
      }

      spin_unlock_irqrestore(&db->lock,flags);
}


/*
 *   Read a word from phyxcer
 */
static int
dm9000_phy_read(struct net_device *dev, int phy_reg_unused, int reg)
{
      board_info_t *db = (board_info_t *) dev->priv;
      unsigned long flags;
      unsigned int reg_save;
      int ret;

      spin_lock_irqsave(&db->lock,flags);

      /* Save previous register address */
      reg_save = readb(db->io_addr);

      /* Fill the phyxcer register into REG_0C */
      iow(db, DM9000_EPAR, DM9000_PHY | reg);

      iow(db, DM9000_EPCR, 0xc);    /* Issue phyxcer read command */
      udelay(100);            /* Wait read complete */
      iow(db, DM9000_EPCR, 0x0);    /* Clear phyxcer read command */

      /* The read data keeps on REG_0D & REG_0E */
      ret = (ior(db, DM9000_EPDRH) << 8) | ior(db, DM9000_EPDRL);

      /* restore the previous address */
      writeb(reg_save, db->io_addr);

      spin_unlock_irqrestore(&db->lock,flags);

      return ret;
}

/*
 *   Write a word to phyxcer
 */
static void
dm9000_phy_write(struct net_device *dev, int phyaddr_unused, int reg, int value)
{
      board_info_t *db = (board_info_t *) dev->priv;
      unsigned long flags;
      unsigned long reg_save;

      spin_lock_irqsave(&db->lock,flags);

      /* Save previous register address */
      reg_save = readb(db->io_addr);

      /* Fill the phyxcer register into REG_0C */
      iow(db, DM9000_EPAR, DM9000_PHY | reg);

      /* Fill the written data into REG_0D & REG_0E */
      iow(db, DM9000_EPDRL, (value & 0xff));
      iow(db, DM9000_EPDRH, ((value >> 8) & 0xff));

      iow(db, DM9000_EPCR, 0xa);    /* Issue phyxcer write command */
      udelay(500);            /* Wait write complete */
      iow(db, DM9000_EPCR, 0x0);    /* Clear phyxcer write command */

      /* restore the previous address */
      writeb(reg_save, db->io_addr);

      spin_unlock_irqrestore(&db->lock,flags);
}

static int
dm9000_drv_suspend(struct platform_device *dev, pm_message_t state)
{
      struct net_device *ndev = platform_get_drvdata(dev);

      if (ndev) {
            if (netif_running(ndev)) {
                  netif_device_detach(ndev);
                  dm9000_shutdown(ndev);
            }
      }
      return 0;
}

static int
dm9000_drv_resume(struct platform_device *dev)
{
      struct net_device *ndev = platform_get_drvdata(dev);
      board_info_t *db = (board_info_t *) ndev->priv;

      if (ndev) {

            if (netif_running(ndev)) {
                  dm9000_reset(db);
                  dm9000_init_dm9000(ndev);

                  netif_device_attach(ndev);
            }
      }
      return 0;
}

static int
dm9000_drv_remove(struct platform_device *pdev)
{
      struct net_device *ndev = platform_get_drvdata(pdev);

      platform_set_drvdata(pdev, NULL);

      unregister_netdev(ndev);
      dm9000_release_board(pdev, (board_info_t *) ndev->priv);
      free_netdev(ndev);            /* free device structure */

      PRINTK1("clean_module() exit\n");

      return 0;
}

static struct platform_driver dm9000_driver = {
      .driver     = {
            .name    = "dm9000",
            .owner       = THIS_MODULE,
      },
      .probe   = dm9000_probe,
      .remove  = dm9000_drv_remove,
      .suspend = dm9000_drv_suspend,
      .resume  = dm9000_drv_resume,
};

static int __init
dm9000_init(void)
{
      printk(KERN_INFO "%s Ethernet Driver\n", CARDNAME);

      return platform_driver_register(&dm9000_driver);      /* search board and register */
}

static void __exit
dm9000_cleanup(void)
{
      platform_driver_unregister(&dm9000_driver);
}

module_init(dm9000_init);
module_exit(dm9000_cleanup);

MODULE_AUTHOR("Sascha Hauer, Ben Dooks");
MODULE_DESCRIPTION("Davicom DM9000 network driver");
MODULE_LICENSE("GPL");

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