dm9000.c

2410最新内核linux2.6.22上dm9000网卡驱动源码

/*
 *   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 <[e-mail]>:
 * 			Fixed phy reset.
 * 			Added tx/rx 32 bit mode.
 * 			Cleaned up for kernel merge.
 *
 *        03/03/2004    Sascha Hauer <[e-mail]>
 *                      Port to 2.6 kernel
 *
 *	  24-Sep-2004   Ben Dooks <[e-mail]>
 *			Cleanup of code to remove ifdefs
 *			Allowed platform device data to influence access width
 *			Reformatting areas of code
 *
 *        17-Mar-2005   Sascha Hauer <[e-mail]>
 *                      * 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 <[e-mail]>
 *			* 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

/*
 * 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;
	struct net_device_stats stats;
	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 struct net_device_stats *dm9000_get_stats(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;

	printk("into dm9000_probe\n");//lzcx
	/* Init network device */
	ndev = alloc_etherdev(sizeof (struct board_info));
	if (!ndev) {
		printk("%s: could not allocate device.\n", CARDNAME);
		return -ENOMEM;
	}

	SET_MODULE_OWNER(ndev);
	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);

	} 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);
		goto release;
	}

	/* 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->get_stats		 = &dm9000_get_stats;
	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) {
		printk("%s: dm9000 at %p,%p IRQ %d MAC: ",
		       ndev->name,  db->io_addr, db->io_data, ndev->irq);
		for (i = 0; i < 5; i++)
			printk("%02x:", ndev->dev_addr[i]);
		printk("%02x\n", ndev->dev_addr[5]);
	}
	return 0;

 release:
 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");