ether1.c

arm平台上的uclinux系统全部源代码

/*
 * linux/arch/arm/drivers/net/ether1.c
 *
 * Acorn ether1 driver (82586 chip)
 *
 * (c) 1996 Russell King
 */

/*
 * We basically keep two queues in the cards memory - one for transmit
 * and one for receive.  Each has a head and a tail.  The head is where
 * we/the chip adds packets to be transmitted/received, and the tail
 * is where the transmitter has got to/where the receiver will stop.
 * Both of these queues are circular, and since the chip is running
 * all the time, we have to be careful when we modify the pointers etc
 * so that the buffer memory is valid all the time.
 */

/*
 * Change log:
 * 1.00	RMK			Released
 * 1.01	RMK	19/03/96	Transfers the last odd byte onto/off of the card now.
 * 1.02	RMK	25/05/97	Added code to restart RU if it goes not ready
 * 1.03	RMK	14/09/97	Cleaned up the handling of a reset during the TX interrupt.
 *				Should prevent lockup.
 * 1.04 RMK	17/09/97	Added more info when initialsation of chip goes wrong.
 *				TDR now only reports failure when chip reports non-zero
 *				TDR time-distance.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/malloc.h>
#include <linux/string.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <linux/errno.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>

#include <asm/ecard.h>

#define __ETHER1_C
#include "ether1.h"

static unsigned int net_debug = NET_DEBUG;

#define FUNC_PROLOGUE \
	struct ether1_priv *priv = (struct ether1_priv *)dev->priv

#define BUFFER_SIZE	0x10000
#define TX_AREA_START	0x00100
#define TX_AREA_END	0x05000
#define RX_AREA_START	0x05000
#define RX_AREA_END	0x0fc00

#define tx_done(dev) 0
/* ------------------------------------------------------------------------- */
static char *version = "ether1 ethernet driver (c) 1995 Russell King v1.04\n";

#define BUS_16 16
#define BUS_8  8

static const card_ids ether1_cids[] = {
	{ MANU_ACORN, PROD_ACORN_ETHER1 },
	{ 0xffff, 0xffff }
};

/* ------------------------------------------------------------------------- */

#define DISABLEIRQS 1
#define NORMALIRQS  0

#define ether1_inw(dev, addr, type, offset, svflgs) ether1_inw_p(dev, addr + (int)(&((type *)0)->offset), svflgs)
#define ether1_outw(dev, val, addr, type, offset, svflgs) ether1_outw_p(dev, val, addr + (int)(&((type *)0)->offset), svflgs)

static inline unsigned short
ether1_inw_p(const struct device *dev, int addr, const int svflgs)
{
    unsigned long flags;
    unsigned short ret;

    if (svflgs) {
	save_flags_cli(flags);
    }
    outb(addr >> 12, REG_PAGE);
    ret = inw(ETHER1_RAM + ((addr & 4095) >> 1));
    if (svflgs)
	restore_flags(flags);
    return ret;
}

static inline void
ether1_outw_p(const struct device *dev, unsigned short val, int addr, const int svflgs)
{
    unsigned long flags;

    if (svflgs) {
	save_flags_cli(flags);
    }
    outb(addr >> 12, REG_PAGE);
    outw(val, ETHER1_RAM + ((addr & 4095) >> 1));
    if (svflgs)
	restore_flags(flags);
}

static inline void *
ether1_inswb(unsigned int addr, void *data, unsigned int len)
{
    int used;

    addr = IO_BASE + (addr << 2);

    __asm__ __volatile__(
	"subs	%3, %3, #2
	bmi	2f
1:	ldr	%0, [%1], #4
	strb	%0, [%2], #1
	mov	%0, %0, lsr #8
	strb	%0, [%2], #1
	subs	%3, %3, #2
	bmi	2f
	ldr	%0, [%1], #4
	strb	%0, [%2], #1
	mov	%0, %0, lsr #8
	strb	%0, [%2], #1
	subs	%3, %3, #2
	bmi	2f
	ldr	%0, [%1], #4
	strb	%0, [%2], #1
	mov	%0, %0, lsr #8
	strb	%0, [%2], #1
	subs	%3, %3, #2
	bmi	2f
	ldr	%0, [%1], #4
	strb	%0, [%2], #1
	mov	%0, %0, lsr #8
	strb	%0, [%2], #1
	subs	%3, %3, #2
	bpl	1b
2:	adds	%3, %3, #1
	ldreqb	%0, [%1]
	streqb	%0, [%2]"
    : "=&r" (used), "=&r" (addr), "=&r" (data), "=&r" (len)
    :                "1"  (addr), "2"   (data), "3"   (len));

    return data;
}

static inline void *
ether1_outswb(unsigned int addr, void *data, unsigned int len)
{
    int used;

    addr = IO_BASE + (addr << 2);

    __asm__ __volatile__(
	"subs	%3, %3, #2
	bmi	2f
1:	ldr	%0, [%2], #2
	mov	%0, %0, lsl #16
	orr	%0, %0, %0, lsr #16
	str	%0, [%1], #4
	subs	%3, %3, #2
	bmi	2f
	ldr	%0, [%2], #2
	mov	%0, %0, lsl #16
	orr	%0, %0, %0, lsr #16
	str	%0, [%1], #4
	subs	%3, %3, #2
	bmi	2f
	ldr	%0, [%2], #2
	mov	%0, %0, lsl #16
	orr	%0, %0, %0, lsr #16
	str	%0, [%1], #4
	subs	%3, %3, #2
	bmi	2f
	ldr	%0, [%2], #2
	mov	%0, %0, lsl #16
	orr	%0, %0, %0, lsr #16
	str	%0, [%1], #4
	subs	%3, %3, #2
	bpl	1b
2:	adds	%3, %3, #1
	ldreqb	%0, [%2]
	streqb	%0, [%1]"
    : "=&r" (used), "=&r" (addr), "=&r" (data), "=&r" (len)
    :                "1"  (addr), "2"   (data), "3"   (len));

    return data;
}


static void
ether1_writebuffer(struct device *dev, void *data, unsigned int start, unsigned int length)
{
    unsigned int page, thislen, offset;

    offset = start & 4095;

    for (page = start >> 12; length; page++) {
	outb(page, REG_PAGE);
	if (offset + length > 4096) {
	    length -= 4096 - offset;
	    thislen = 4096 - offset;
	} else {
	    thislen = length;
	    length = 0;
	}

	data = ether1_outswb(ETHER1_RAM + (offset >> 1), data, thislen);
	offset = 0;
    }
}

static void
ether1_readbuffer(struct device *dev, void *data, unsigned int start, unsigned int length)
{
    unsigned int page, thislen, offset;

    offset = start & 4095;

    for (page = start >> 12; length; page++) {
	outb(page, REG_PAGE);
	if (offset + length > 4096) {
	    length -= 4096 - offset;
	    thislen = 4096 - offset;
	} else {
	    thislen = length;
	    length = 0;
	}

	data = ether1_inswb(ETHER1_RAM + (offset >> 1), data, thislen);
	offset = 0;
    }
}

static int
ether1_ramtest(struct device *dev, unsigned char byte)
{
    unsigned char *buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL);
    int i, ret = BUFFER_SIZE;
    int max_errors = 15;
    int bad = -1;
    int bad_start = 0;

    if (!buffer)
	return 1;

    memset(buffer, byte, BUFFER_SIZE);
    ether1_writebuffer(dev, buffer, 0, BUFFER_SIZE);
    memset(buffer, byte ^ 0xff, BUFFER_SIZE);
    ether1_readbuffer(dev, buffer, 0, BUFFER_SIZE);

    for (i = 0; i < BUFFER_SIZE; i++) {
	if (buffer[i] != byte) {
	    if (max_errors >= 0 && bad != buffer[i]) {
		if (bad != -1)
		    printk("\n");
		printk(KERN_CRIT "%s: RAM failed with (%02X instead of %02X) at 0x%04X",
			dev->name, buffer[i], byte, i);
		ret = -ENODEV;
		max_errors --;
		bad = buffer[i];
		bad_start = i;
	    }
	} else {
	    if (bad != -1) {
	    	if (bad_start == i - 1)
		    printk("\n");
		else
		    printk(" - 0x%04X\n", i - 1);
		bad = -1;
	    }
	}
    }

    if (bad != -1)
	printk(" - 0x%04X\n", BUFFER_SIZE);
    kfree(buffer);

    return ret;
}

static int
ether1_reset(struct device *dev)
{
    outb(CTRL_RST|CTRL_ACK, REG_CONTROL);
    return BUS_16;
}

static int
ether1_init_2(struct device *dev)
{
    int i;
    dev->mem_start = 0;

    i = ether1_ramtest(dev, 0x5a);

    if (i > 0)
	i = ether1_ramtest(dev, 0x1e);

    if (i <= 0)
    	return -ENODEV;

    dev->mem_end = i;
    return 0;
}

/*
 * These are the structures that are loaded into the ether RAM card to
 * initialise the 82586
 */

/* at 0x0100 */
#define NOP_ADDR	(TX_AREA_START)
#define NOP_SIZE	(0x06)
static nop_t  init_nop  = {
	{ 0, CMD_NOP },
	NOP_ADDR
};

/* at 0x003a */
#define TDR_ADDR	(0x003a)
#define TDR_SIZE	(0x08)
static tdr_t  init_tdr	= {
	{ 0, CMD_TDR | CMD_INTR },
	NOP_ADDR, 0
};

/* at 0x002e */
#define MC_ADDR		(0x002e)
#define MC_SIZE		(0x0c)
static mc_t   init_mc   = {
	{ 0, CMD_SETMULTICAST },
	TDR_ADDR, 0, { { 0, } }
};

/* at 0x0022 */
#define SA_ADDR		(0x0022)
#define SA_SIZE		(0x0c)
static sa_t   init_sa   = {
	{ 0, CMD_SETADDRESS },
	MC_ADDR, { 0, }
};

/* at 0x0010 */
#define CFG_ADDR	(0x0010)
#define CFG_SIZE	(0x12)
static cfg_t  init_cfg  = {
	{ 0, CMD_CONFIG },
	SA_ADDR,
	8,
	8,
	CFG8_SRDY,
	CFG9_PREAMB8 | CFG9_ADDRLENBUF | CFG9_ADDRLEN(6),
	0,
	0x60,
	0,
	CFG13_RETRY(15) | CFG13_SLOTH(2),
	0,
};

/* at 0x0000 */
#define SCB_ADDR	(0x0000)
#define SCB_SIZE	(0x10)
static scb_t  init_scb  = {
	0,
	SCB_CMDACKRNR | SCB_CMDACKCNA | SCB_CMDACKFR | SCB_CMDACKCX,
	CFG_ADDR,
	RX_AREA_START,
	0,
	0,
	0,
	0
};

/* at 0xffee */
#define ISCP_ADDR	(0xffee)
#define ISCP_SIZE	(0x08)
static iscp_t init_iscp = {
	1,
	SCB_ADDR,
	0x0000,
	0x0000
};

/* at 0xfff6 */
#define SCP_ADDR	(0xfff6)
#define SCP_SIZE	(0x0a)
static scp_t  init_scp  = {
	SCP_SY_16BBUS,
	{ 0, 0 },
	ISCP_ADDR,
	0
};

#define RFD_SIZE	(0x16)
#define RBD_SIZE	(0x0a)
#define TX_SIZE		(0x08)
#define TBD_SIZE	(0x08)

static void
ether1_setup_rx_buffer(struct device *dev)
{
	struct ether1_priv *priv = (struct ether1_priv *)dev->priv;
	unsigned int addr, next, next2;
	rfd_t rfd;
	rbd_t rbd;

	memset(&rfd, 0, sizeof(rfd));
	memset(&rbd, 0, sizeof(rbd));

	rbd.rbd_len = ETH_FRAME_LEN + 8;

	/*
	 * setup circularly linked list of { rfd, rbd, buffer }, with
	 * all rfds circularly linked, rbds circularly linked.
	 * First rfd is linked to scp, first rbd is linked to first
	 * rfd.  Last rbd has a suspend command.
	 */
	addr = RX_AREA_START;
	do {
		next  = addr + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10;
		next2 = next + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10;

		if (next2 >= RX_AREA_END) {
			next = RX_AREA_START;
			rfd.hdr.command = RFD_CMDEL | RFD_CMDSUSPEND;
			priv->rx_tail = addr;
		} else
			rfd.hdr.command = 0;

		if (addr == RX_AREA_START)
			rfd.rfd_rbdoffset = RX_AREA_START + RFD_SIZE;
		else
			rfd.rfd_rbdoffset = 0;

		rfd.rfd_link = next;
		rbd.rbd_link = next + RFD_SIZE;
		rbd.rbd_bufl = addr + RFD_SIZE + RBD_SIZE;

		ether1_writebuffer(dev, &rfd, addr, RFD_SIZE);
		ether1_writebuffer(dev, &rbd, addr + RFD_SIZE, RBD_SIZE);
		addr = next;
	} while (next2 < RX_AREA_END);
}

static int
ether1_init_for_open(struct device *dev)
{
    FUNC_PROLOGUE;
    int i, status;
    int failures = 0;

    outb(CTRL_RST|CTRL_ACK, REG_CONTROL);

    for (i = 0; i < 6; i++)
	init_sa.sa_addr[i] = dev->dev_addr[i];

    /* load data structures into ether1 RAM */
    ether1_writebuffer(dev, &init_scp,  SCP_ADDR,  SCP_SIZE);
    ether1_writebuffer(dev, &init_iscp, ISCP_ADDR, ISCP_SIZE);
    ether1_writebuffer(dev, &init_scb,  SCB_ADDR,  SCB_SIZE);
    ether1_writebuffer(dev, &init_cfg,  CFG_ADDR,  CFG_SIZE);
    ether1_writebuffer(dev, &init_sa,   SA_ADDR,   SA_SIZE);
    ether1_writebuffer(dev, &init_mc,   MC_ADDR,   MC_SIZE);
    ether1_writebuffer(dev, &init_tdr,  TDR_ADDR,  TDR_SIZE);
    ether1_writebuffer(dev, &init_nop,  NOP_ADDR,  NOP_SIZE);

    if (ether1_inw(dev, CFG_ADDR, cfg_t, hdr.command, NORMALIRQS) != CMD_CONFIG) {
	printk(KERN_ERR "%s: detected either RAM fault or compiler bug\n",
		dev->name);
	return 1;
    }

	ether1_setup_rx_buffer(dev);

    priv->tx_link = NOP_ADDR;
    priv->tx_head = NOP_ADDR + NOP_SIZE;
    priv->tx_tail = TDR_ADDR;
    priv->rx_head = RX_AREA_START;

    /* release reset & give 586 a prod */
    priv->resetting = 1;
    priv->initialising = 1;
    outb(CTRL_RST, REG_CONTROL);
    outb(0, REG_CONTROL);
    outb(CTRL_CA, REG_CONTROL);

    /* 586 should now unset iscp.busy */
    i = jiffies + HZ/2;
    while (ether1_inw(dev, ISCP_ADDR, iscp_t, iscp_busy, DISABLEIRQS) == 1) {
	if (jiffies > i) {
	    printk(KERN_WARNING "%s: can't initialise 82586: iscp is busy\n", dev->name);
	    return 1;
	}
    }

    /* check status of commands that we issued */
    i += HZ/10;
    while (((status = ether1_inw(dev, CFG_ADDR, cfg_t, hdr.status, DISABLEIRQS))
		& STAT_COMPLETE) == 0) {
	if (jiffies > i)
	    break;
    }

    if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
	printk(KERN_WARNING "%s: can't initialise 82586: config status %04X\n", dev->name, status);
	printk(KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
		ether1_inw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
		ether1_inw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
		ether1_inw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
		ether1_inw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
	failures += 1;
    }

    i += HZ/10;
    while (((status = ether1_inw(dev, SA_ADDR, sa_t, hdr.status, DISABLEIRQS))
		& STAT_COMPLETE) == 0) {
	if (jiffies > i)
	    break;
    }

    if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
	printk(KERN_WARNING "%s: can't initialise 82586: set address status %04X\n", dev->name, status);
	printk(KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
		ether1_inw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
		ether1_inw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
		ether1_inw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
		ether1_inw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
	failures += 1;
    }

    i += HZ/10;
    while (((status = ether1_inw(dev, MC_ADDR, mc_t, hdr.status, DISABLEIRQS))
		& STAT_COMPLETE) == 0) {
	if (jiffies > i)
	    break;
    }

    if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
	printk(KERN_WARNING "%s: can't initialise 82586: set multicast status %04X\n", dev->name, status);
	printk(KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
		ether1_inw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
		ether1_inw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
		ether1_inw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
		ether1_inw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
	failures += 1;
    }

    i += HZ;
    while (((status = ether1_inw(dev, TDR_ADDR, tdr_t, hdr.status, DISABLEIRQS))
		& STAT_COMPLETE) == 0) {
	if (jiffies > i)
	    break;
    }

    if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
	printk(KERN_WARNING "%s: can't tdr (ignored)\n", dev->name);
	printk(KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
		ether1_inw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
		ether1_inw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
		ether1_inw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
		ether1_inw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
    } else {
	status = ether1_inw(dev, TDR_ADDR, tdr_t, tdr_result, DISABLEIRQS);
	if (status & TDR_XCVRPROB)
	    printk(KERN_WARNING "%s: i/f failed tdr: transceiver problem\n", dev->name);
	else if ((status & (TDR_SHORT|TDR_OPEN)) && (status & TDR_TIME)) {
#ifdef FANCY
	    printk(KERN_WARNING "%s: i/f failed tdr: cable %s %d.%d us away\n", dev->name,
		    status & TDR_SHORT ? "short" : "open", (status & TDR_TIME) / 10,
		    (status & TDR_TIME) % 10);
#else