sun3_82586.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 1,212 行 · 第 1/3 页

/*
 * Sun3 i82586 Ethernet driver
 *
 * Cloned from ni52.c for the Sun3 by Sam Creasey ([e-mail])
 *
 * Original copyright follows:
 * --------------------------
 *
 * net-3-driver for the NI5210 card (i82586 Ethernet chip)
 *
 * This is an extension to the Linux operating system, and is covered by the
 * same Gnu Public License that covers that work.
 *
 * Alphacode 0.82 (96/09/29) for Linux 2.0.0 (or later)
 * Copyrights (c) 1994,1995,1996 by M.Hipp ([e-mail])
 * --------------------------
 * 
 * Consult ni52.c for further notes from the original driver.
 *
 * This incarnation currently supports the OBIO version of the i82586 chip 
 * used in certain sun3 models.  It should be fairly doable to expand this
 * to support VME if I should every acquire such a board.
 *
 */

static int debuglevel = 0; /* debug-printk 0: off 1: a few 2: more */
static int automatic_resume = 0; /* experimental .. better should be zero */
static int rfdadd = 0; /* rfdadd=1 may be better for 8K MEM cards */
static int fifo=0x8;	/* don't change */

/* #define REALLY_SLOW_IO */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/idprom.h>
#include <asm/machines.h>
#include <asm/sun3mmu.h>
#include <asm/dvma.h>
#include <asm/byteorder.h>

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

#include "sun3_82586.h"

#define DRV_NAME "sun3_82586"

#define DEBUG       /* debug on */
#define SYSBUSVAL 0 /* 16 Bit */
#define SUN3_82586_TOTAL_SIZE	PAGE_SIZE

#define sun3_attn586()  {*(volatile unsigned char *)(dev->base_addr) |= IEOB_ATTEN; *(volatile unsigned char *)(dev->base_addr) &= ~IEOB_ATTEN;}
#define sun3_reset586() {*(volatile unsigned char *)(dev->base_addr) = 0; udelay(100); *(volatile unsigned char *)(dev->base_addr) = IEOB_NORSET;}
#define sun3_disint()   {*(volatile unsigned char *)(dev->base_addr) &= ~IEOB_IENAB;}
#define sun3_enaint()   {*(volatile unsigned char *)(dev->base_addr) |= IEOB_IENAB;}
#define sun3_active()   {*(volatile unsigned char *)(dev->base_addr) |= (IEOB_IENAB|IEOB_ONAIR|IEOB_NORSET);}

#define make32(ptr16) (p->memtop + (swab16((unsigned short) (ptr16))) )
#define make24(ptr32) (char *)swab32(( ((unsigned long) (ptr32)) - p->base))
#define make16(ptr32) (swab16((unsigned short) ((unsigned long)(ptr32) - (unsigned long) p->memtop )))

/******************* how to calculate the buffers *****************************

  * IMPORTANT NOTE: if you configure only one NUM_XMIT_BUFFS, the driver works
  * --------------- in a different (more stable?) mode. Only in this mode it's
  *                 possible to configure the driver with 'NO_NOPCOMMANDS'

sizeof(scp)=12; sizeof(scb)=16; sizeof(iscp)=8;
sizeof(scp)+sizeof(iscp)+sizeof(scb) = 36 = INIT
sizeof(rfd) = 24; sizeof(rbd) = 12;
sizeof(tbd) = 8; sizeof(transmit_cmd) = 16;
sizeof(nop_cmd) = 8;

  * if you don't know the driver, better do not change these values: */

#define RECV_BUFF_SIZE 1536 /* slightly oversized */
#define XMIT_BUFF_SIZE 1536 /* slightly oversized */
#define NUM_XMIT_BUFFS 1    /* config for 32K shmem */
#define NUM_RECV_BUFFS_8 4 /* config for 32K shared mem */
#define NUM_RECV_BUFFS_16 9 /* config for 32K shared mem */
#define NUM_RECV_BUFFS_32 16 /* config for 32K shared mem */
#define NO_NOPCOMMANDS      /* only possible with NUM_XMIT_BUFFS=1 */

/**************************************************************************/

/* different DELAYs */
#define DELAY(x) mdelay(32 * x);
#define DELAY_16(); { udelay(16); }
#define DELAY_18(); { udelay(4); }

/* wait for command with timeout: */
#define WAIT_4_SCB_CMD() \
{ int i; \
  for(i=0;i<16384;i++) { \
    if(!p->scb->cmd_cuc) break; \
    DELAY_18(); \
    if(i == 16383) { \
      printk("%s: scb_cmd timed out: %04x,%04x .. disabling i82586!!\n",dev->name,p->scb->cmd_cuc,p->scb->cus); \
       if(!p->reseted) { p->reseted = 1; sun3_reset586(); } } } }

#define WAIT_4_SCB_CMD_RUC() { int i; \
  for(i=0;i<16384;i++) { \
    if(!p->scb->cmd_ruc) break; \
    DELAY_18(); \
    if(i == 16383) { \
      printk("%s: scb_cmd (ruc) timed out: %04x,%04x .. disabling i82586!!\n",dev->name,p->scb->cmd_ruc,p->scb->rus); \
       if(!p->reseted) { p->reseted = 1; sun3_reset586(); } } } }

#define WAIT_4_STAT_COMPL(addr) { int i; \
   for(i=0;i<32767;i++) { \
     if(swab16((addr)->cmd_status) & STAT_COMPL) break; \
     DELAY_16(); DELAY_16(); } }

static int     sun3_82586_probe1(struct net_device *dev,int ioaddr);
static irqreturn_t sun3_82586_interrupt(int irq,void *dev_id,struct pt_regs *reg_ptr);
static int     sun3_82586_open(struct net_device *dev);
static int     sun3_82586_close(struct net_device *dev);
static int     sun3_82586_send_packet(struct sk_buff *,struct net_device *);
static struct  net_device_stats *sun3_82586_get_stats(struct net_device *dev);
static void    set_multicast_list(struct net_device *dev);
static void    sun3_82586_timeout(struct net_device *dev);
#if 0
static void    sun3_82586_dump(struct net_device *,void *);
#endif

/* helper-functions */
static int     init586(struct net_device *dev);
static int     check586(struct net_device *dev,char *where,unsigned size);
static void    alloc586(struct net_device *dev);
static void    startrecv586(struct net_device *dev);
static void   *alloc_rfa(struct net_device *dev,void *ptr);
static void    sun3_82586_rcv_int(struct net_device *dev);
static void    sun3_82586_xmt_int(struct net_device *dev);
static void    sun3_82586_rnr_int(struct net_device *dev);

struct priv
{
	struct net_device_stats stats;
	unsigned long base;
	char *memtop;
	long int lock;
	int reseted;
	volatile struct rfd_struct	*rfd_last,*rfd_top,*rfd_first;
	volatile struct scp_struct	*scp;	/* volatile is important */
	volatile struct iscp_struct	*iscp;	/* volatile is important */
	volatile struct scb_struct	*scb;	/* volatile is important */
	volatile struct tbd_struct	*xmit_buffs[NUM_XMIT_BUFFS];
	volatile struct transmit_cmd_struct *xmit_cmds[NUM_XMIT_BUFFS];
#if (NUM_XMIT_BUFFS == 1)
	volatile struct nop_cmd_struct *nop_cmds[2];
#else
	volatile struct nop_cmd_struct *nop_cmds[NUM_XMIT_BUFFS];
#endif
	volatile int		nop_point,num_recv_buffs;
	volatile char		*xmit_cbuffs[NUM_XMIT_BUFFS];
	volatile int		xmit_count,xmit_last;
};

/**********************************************
 * close device
 */
static int sun3_82586_close(struct net_device *dev)
{
	free_irq(dev->irq, dev);

	sun3_reset586(); /* the hard way to stop the receiver */

	netif_stop_queue(dev);

	return 0;
}

/**********************************************
 * open device
 */
static int sun3_82586_open(struct net_device *dev)
{
	int ret;

	sun3_disint();
	alloc586(dev);
	init586(dev);
	startrecv586(dev);
	sun3_enaint();

	ret = request_irq(dev->irq, &sun3_82586_interrupt,0,dev->name,dev);
	if (ret)
	{
		sun3_reset586();
		return ret;
	}

	netif_start_queue(dev);

	return 0; /* most done by init */
}

/**********************************************
 * Check to see if there's an 82586 out there.
 */
static int check586(struct net_device *dev,char *where,unsigned size)
{
	struct priv pb;
	struct priv *p = /* (struct priv *) dev->priv*/ &pb;
	char *iscp_addr;
	int i;

	p->base = (unsigned long) dvma_btov(0);
	p->memtop = (char *)dvma_btov((unsigned long)where);
	p->scp = (struct scp_struct *)(p->base + SCP_DEFAULT_ADDRESS);
	memset((char *)p->scp,0, sizeof(struct scp_struct));
	for(i=0;i<sizeof(struct scp_struct);i++) /* memory was writeable? */
		if(((char *)p->scp)[i])
			return 0;
	p->scp->sysbus = SYSBUSVAL;				/* 1 = 8Bit-Bus, 0 = 16 Bit */
	if(p->scp->sysbus != SYSBUSVAL)
		return 0;

	iscp_addr = (char *)dvma_btov((unsigned long)where);
	
	p->iscp = (struct iscp_struct *) iscp_addr;
	memset((char *)p->iscp,0, sizeof(struct iscp_struct));

	p->scp->iscp = make24(p->iscp);
	p->iscp->busy = 1;

	sun3_reset586();
	sun3_attn586();
	DELAY(1);	/* wait a while... */
	
	if(p->iscp->busy) /* i82586 clears 'busy' after successful init */
		return 0;

	return 1;
}

/******************************************************************
 * set iscp at the right place, called by sun3_82586_probe1 and open586.
 */
static void alloc586(struct net_device *dev)
{
	struct priv *p =	(struct priv *) dev->priv;

	sun3_reset586();
	DELAY(1);

	p->scp	= (struct scp_struct *)	(p->base + SCP_DEFAULT_ADDRESS);
	p->iscp	= (struct iscp_struct *) dvma_btov(dev->mem_start);
	p->scb  = (struct scb_struct *)  ((char *)p->iscp + sizeof(struct iscp_struct));

	memset((char *) p->iscp,0,sizeof(struct iscp_struct));
	memset((char *) p->scp ,0,sizeof(struct scp_struct));

	p->scp->iscp = make24(p->iscp);
	p->scp->sysbus = SYSBUSVAL;
	p->iscp->scb_offset = make16(p->scb);
	p->iscp->scb_base = make24(dvma_btov(dev->mem_start));

	p->iscp->busy = 1;
	sun3_reset586();
	sun3_attn586();

	DELAY(1);

	if(p->iscp->busy)
		printk("%s: Init-Problems (alloc).\n",dev->name);

	p->reseted = 0;

	memset((char *)p->scb,0,sizeof(struct scb_struct));
}

struct net_device * __init sun3_82586_probe(int unit)
{
	struct net_device *dev;
	unsigned long ioaddr;
	static int found = 0;
	int err = -ENOMEM;
	
	/* check that this machine has an onboard 82586 */
	switch(idprom->id_machtype) {
	case SM_SUN3|SM_3_160:
	case SM_SUN3|SM_3_260:
		/* these machines have 82586 */
		break;

	default:
		return ERR_PTR(-ENODEV);
	}

	if (found)
		return ERR_PTR(-ENODEV);
	
	ioaddr = (unsigned long)ioremap(IE_OBIO, SUN3_82586_TOTAL_SIZE);
	if (!ioaddr)
		return ERR_PTR(-ENOMEM);
	found = 1;
	
	dev = alloc_etherdev(sizeof(struct priv));
	if (!dev)
		goto out;
	if (unit >= 0) {
		sprintf(dev->name, "eth%d", unit);
		netdev_boot_setup_check(dev);
	}
	SET_MODULE_OWNER(dev);

	dev->irq = IE_IRQ;
	dev->base_addr = ioaddr;
	err = sun3_82586_probe1(dev, ioaddr);
	if (err)
		goto out1;
	err = register_netdev(dev);
	if (err)
		goto out2;
	return dev;

out2:
	release_region(ioaddr, SUN3_82586_TOTAL_SIZE);
out1:
	free_netdev(dev);
out:
	iounmap((void *)ioaddr);
	return ERR_PTR(err);
}

static int __init sun3_82586_probe1(struct net_device *dev,int ioaddr)
{
	int i, size, retval;

	if (!request_region(ioaddr, SUN3_82586_TOTAL_SIZE, DRV_NAME))
		return -EBUSY;

	/* copy in the ethernet address from the prom */
	for(i = 0; i < 6 ; i++)
	     dev->dev_addr[i] = idprom->id_ethaddr[i];

	printk("%s: SUN3 Intel 82586 found at %lx, ",dev->name,dev->base_addr);

	/*
	 * check (or search) IO-Memory, 32K
	 */
	size = 0x8000;

	dev->mem_start = (unsigned long)dvma_malloc_align(0x8000, 0x1000);
	dev->mem_end = dev->mem_start + size;

	if(size != 0x2000 && size != 0x4000 && size != 0x8000) {
		printk("\n%s: Illegal memory size %d. Allowed is 0x2000 or 0x4000 or 0x8000 bytes.\n",dev->name,size);
		retval = -ENODEV;
		goto out;
	}
	if(!check586(dev,(char *) dev->mem_start,size)) {
		printk("?memcheck, Can't find memory at 0x%lx with size %d!\n",dev->mem_start,size);
		retval = -ENODEV;
		goto out;
	}

	((struct priv *) (dev->priv))->memtop = (char *)dvma_btov(dev->mem_start);
	((struct priv *) (dev->priv))->base = (unsigned long) dvma_btov(0);
	alloc586(dev);

	/* set number of receive-buffs according to memsize */
	if(size == 0x2000)
		((struct priv *) dev->priv)->num_recv_buffs = NUM_RECV_BUFFS_8;
	else if(size == 0x4000)
		((struct priv *) dev->priv)->num_recv_buffs = NUM_RECV_BUFFS_16;
	else
		((struct priv *) dev->priv)->num_recv_buffs = NUM_RECV_BUFFS_32;

	printk("Memaddr: 0x%lx, Memsize: %d, IRQ %d\n",dev->mem_start,size, dev->irq);
	
	dev->open		= sun3_82586_open;
	dev->stop		= sun3_82586_close;
	dev->get_stats		= sun3_82586_get_stats;
	dev->tx_timeout 	= sun3_82586_timeout;
	dev->watchdog_timeo	= HZ/20;
	dev->hard_start_xmit 	= sun3_82586_send_packet;
	dev->set_multicast_list = set_multicast_list;

	dev->if_port 		= 0;
	return 0;
out:
	release_region(ioaddr, SUN3_82586_TOTAL_SIZE);
	return retval;
}


static int init586(struct net_device *dev)
{
	void *ptr;
	int i,result=0;
	struct priv *p = (struct priv *) dev->priv;
	volatile struct configure_cmd_struct	*cfg_cmd;