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sun3_82586.c
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/*
* Sun3 i82586 Ethernet driver
*
* Cloned from ni52.c for the Sun3 by Sam Creasey ([email protected])
*
* 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 ([email protected])
* --------------------------
*
* 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 <linux/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;
volatile struct iasetup_cmd_struct *ias_cmd;
volatile struct tdr_cmd_struct *tdr_cmd;
volatile struct mcsetup_cmd_struct *mc_cmd;
struct dev_mc_list *dmi=dev->mc_list;
int num_addrs=dev->mc_count;
ptr = (void *) ((char *)p->scb + sizeof(struct scb_struct));
cfg_cmd = (struct configure_cmd_struct *)ptr; /* configure-command */
cfg_cmd->cmd_status = 0;
cfg_cmd->cmd_cmd = swab16(CMD_CONFIGURE | CMD_LAST);
cfg_cmd->cmd_link = 0xffff;
cfg_cmd->byte_cnt = 0x0a; /* number of cfg bytes */
cfg_cmd->fifo = fifo; /* fifo-limit (8=tx:32/rx:64) */
cfg_cmd->sav_bf = 0x40; /* hold or discard bad recv frames (bit 7) */
cfg_cmd->adr_len = 0x2e; /* addr_len |!src_insert |pre-len |loopback */
cfg_cmd->priority = 0x00;
cfg_cmd->ifs = 0x60;
cfg_cmd->time_low = 0x00;
cfg_cmd->time_high = 0xf2;
cfg_cmd->promisc = 0;
if(dev->flags & IFF_ALLMULTI) {
int len = ((char *) p->iscp - (char *) ptr - 8) / 6;
if(num_addrs > len) {
printk("%s: switching to promisc. mode\n",dev->name);
dev->flags|=IFF_PROMISC;
}
}
if(dev->flags&IFF_PROMISC)
{
cfg_cmd->promisc=1;
dev->flags|=IFF_PROMISC;
}
cfg_cmd->carr_coll = 0x00;
p->scb->cbl_offset = make16(cfg_cmd);
p->scb->cmd_ruc = 0;
p->scb->cmd_cuc = CUC_START; /* cmd.-unit start */
sun3_attn586();
WAIT_4_STAT_COMPL(cfg_cmd);
if((swab16(cfg_cmd->cmd_status) & (STAT_OK|STAT_COMPL)) != (STAT_COMPL|STAT_OK))
{
printk("%s: configure command failed: %x\n",dev->name,swab16(cfg_cmd->cmd_status));
return 1;
}
/*
* individual address setup
*/
ias_cmd = (struct iasetup_cmd_struct *)ptr;
ias_cmd->cmd_status = 0;
ias_cmd->cmd_cmd = swab16(CMD_IASETUP | CMD_LAST);
ias_cmd->cmd_link = 0xffff;
memcpy((char *)&ias_cmd->iaddr,(char *) dev->dev_addr,ETH_ALEN);
p->scb->cbl_offset = make16(ias_cmd);
p->scb->cmd_cuc = CUC_START; /* cmd.-unit start */
sun3_attn586();
WAIT_4_STAT_COMPL(ias_cmd);
if((swab16(ias_cmd->cmd_status) & (STAT_OK|STAT_COMPL)) != (STAT_OK|STAT_COMPL)) {
printk("%s (82586): individual address setup command failed: %04x\n",dev->name,swab16(ias_cmd->cmd_status));
return 1;
}
/*
* TDR, wire check .. e.g. no resistor e.t.c
*/
tdr_cmd = (struct tdr_cmd_struct *)ptr;
tdr_cmd->cmd_status = 0;
tdr_cmd->cmd_cmd = swab16(CMD_TDR | CMD_LAST);
tdr_cmd->cmd_link = 0xffff;
tdr_cmd->status = 0;
p->scb->cbl_offset = make16(tdr_cmd);
p->scb->cmd_cuc = CUC_START; /* cmd.-unit start */
sun3_attn586();
WAIT_4_STAT_COMPL(tdr_cmd);
if(!(swab16(tdr_cmd->cmd_status) & STAT_COMPL))
{
printk("%s: Problems while running the TDR.\n",dev->name);
}
else
{
DELAY_16(); /* wait for result */
result = swab16(tdr_cmd->status);
p->scb->cmd_cuc = p->scb->cus & STAT_MASK;
sun3_attn586(); /* ack the interrupts */
if(result & TDR_LNK_OK)
;
else if(result & TDR_XCVR_PRB)
printk("%s: TDR: Transceiver problem. Check the cable(s)!\n",dev->name);
else if(result & TDR_ET_OPN)
printk("%s: TDR: No correct termination %d clocks away.\n",dev->name,result & TDR_TIMEMASK);
else if(result & TDR_ET_SRT)
{
if (result & TDR_TIMEMASK) /* time == 0 -> strange :-) */
printk("%s: TDR: Detected a short circuit %d clocks away.\n",dev->name,result & TDR_TIMEMASK);
}
else
printk("%s: TDR: Unknown status %04x\n",dev->name,result);
}
/*
* Multicast setup
*/
if(num_addrs && !(dev->flags & IFF_PROMISC) )
{
mc_cmd = (struct mcsetup_cmd_struct *) ptr;
mc_cmd->cmd_status = 0;
mc_cmd->cmd_cmd = swab16(CMD_MCSETUP | CMD_LAST);
mc_cmd->cmd_link = 0xffff;
mc_cmd->mc_cnt = swab16(num_addrs * 6);
for(i=0;i<num_addrs;i++,dmi=dmi->next)
memcpy((char *) mc_cmd->mc_list[i], dmi->dmi_addr,6);
p->scb->cbl_offset = make16(mc_cmd);
p->scb->cmd_cuc = CUC_START;
sun3_attn586();
WAIT_4_STAT_COMPL(mc_cmd);
if( (swab16(mc_cmd->cmd_status) & (STAT_COMPL|STAT_OK)) != (STAT_COMPL|STAT_OK) )
printk("%s: Can't apply multicast-address-list.\n",dev->name);
}
/*
* alloc nop/xmit-cmds
*/
#if (NUM_XMIT_BUFFS == 1)
for(i=0;i<2;i++)
{
p->nop_cmds[i] = (struct nop_cmd_struct *)ptr;
p->nop_cmds[i]->cmd_cmd = swab16(CMD_NOP);
p->nop_cmds[i]->cmd_status = 0;
p->nop_cmds[i]->cmd_link = make16((p->nop_cmds[i]));
ptr = (char *) ptr + sizeof(struct nop_cmd_struct);
}
#else
for(i=0;i<NUM_XMIT_BUFFS;i++)
{
p->nop_cmds[i] = (struct nop_cmd_struct *)ptr;
p->nop_cmds[i]->cmd_cmd = swab16(CMD_NOP);
p->nop_cmds[i]->cmd_status = 0;
p->nop_cmds[i]->cmd_link = make16((p->nop_cmds[i]));
ptr = (char *) ptr + sizeof(struct nop_cmd_struct);
}
#endif
ptr = alloc_rfa(dev,(void *)ptr); /* init receive-frame-area */
/*
* alloc xmit-buffs / init xmit_cmds
*/
for(i=0;i<NUM_XMIT_BUFFS;i++)
{
p->xmit_cmds[i] = (struct transmit_cmd_struct *)ptr; /*transmit cmd/buff 0*/
ptr = (char *) ptr + sizeof(struct transmit_cmd_struct);
p->xmit_cbuffs[i] = (char *)ptr; /* char-buffs */
ptr = (char *) ptr + XMIT_BUFF_SIZE;
p->xmit_buffs[i] = (struct tbd_struct *)ptr; /* TBD */
ptr = (char *) ptr + sizeof(struct tbd_struct);
if((void *)ptr > (void *)dev->mem_end)
{
printk("%s: not enough shared-mem for your configuration!\n",dev->name);
return 1;
}
memset((char *)(p->xmit_cmds[i]) ,0, sizeof(struct transmit_cmd_struct));
memset((char *)(p->xmit_buffs[i]),0, sizeof(struct tbd_struct));
p->xmit_cmds[i]->cmd_link = make16(p->nop_cmds[(i+1)%NUM_XMIT_BUFFS]);
p->xmit_cmds[i]->cmd_status = swab16(STAT_COMPL);
p->xmit_cmds[i]->cmd_cmd = swab16(CMD_XMIT | CMD_INT);
p->xmit_cmds[i]->tbd_offset = make16((p->xmit_buffs[i]));
p->xmit_buffs[i]->next = 0xffff;
p->xmit_buffs[i]->buffer = make24((p->xmit_cbuffs[i]));
}
p->xmit_count = 0;
p->xmit_last = 0;
#ifndef NO_NOPCOMMANDS
p->nop_point = 0;
#endif
/*
* 'start transmitter'
*/
#ifndef NO_NOPCOMMANDS
p->scb->cbl_offset = make16(p->nop_cmds[0]);
p->scb->cmd_cuc = CUC_START;
sun3_attn586();
WAIT_4_SCB_CMD();
#else
p->xmit_cmds[0]->cmd_link = make16(p->xmit_cmds[0]);
p->xmit_cmds[0]->cmd_cmd = swab16(CMD_XMIT | CMD_SUSPEND | CMD_INT);
#endif
/*
* ack. interrupts
*/
p->scb->cmd_cuc = p->scb->cus & STAT_MASK;
sun3_attn586();
DELAY_16();
sun3_enaint();
sun3_active();
return 0;
}
/******************************************************
* This is a helper routine for sun3_82586_rnr_int() and init586().
* It sets up the Receive Frame Area (RFA).
*/
static void *alloc_rfa(struct net_device *dev,void *ptr)
{
volatile struct rfd_struct *rfd = (struct rfd_struct *)ptr;
volatile struct rbd_struct *rbd;
int i;
struct priv *p = (struct priv *) dev->priv;
memset((char *) rfd,0,sizeof(struct rfd_struct)*(p->num_recv_buffs+rfdadd));
p->rfd_first = rfd;
for(i = 0; i < (p->num_recv_buffs+rfdadd); i++) {
rfd[i].next = make16(rfd + (i+1) % (p->num_recv_buffs+rfdadd) );
rfd[i].rbd_offset = 0xffff;
}
rfd[p->num_recv_buffs-1+rfdadd].last = RFD_SUSP; /* RU suspend */
ptr = (void *) (rfd + (p->num_recv_buffs + rfdadd) );
rbd = (struct rbd_struct *) ptr;
ptr = (void *) (rbd + p->num_recv_buffs);
/* clr descriptors */
memset((char *) rbd,0,sizeof(struct rbd_struct)*(p->num_recv_buffs));
for(i=0;i<p->num_recv_buffs;i++)
{
rbd[i].next = make16((rbd + (i+1) % p->num_recv_buffs));
rbd[i].size = swab16(RECV_BUFF_SIZE);
rbd[i].buffer = make24(ptr);
ptr = (char *) ptr + RECV_BUFF_SIZE;
}
p->rfd_top = p->rfd_first;
p->rfd_last = p->rfd_first + (p->num_recv_buffs - 1 + rfdadd);
p->scb->rfa_offset = make16(p->rfd_first);
p->rfd_first->rbd_offset = make16(rbd);
return ptr;
}
/**************************************************
* Interrupt Handler ...
*/
static irqreturn_t sun3_82586_interrupt(int irq,void *dev_id,struct pt_regs *reg_ptr)
{
struct net_device *dev = dev_id;
unsigned short stat;
int cnt=0;
struct priv *p;
if (!dev) {
printk ("sun3_82586-interrupt: irq %d for unknown device.\n",irq);
return IRQ_NONE;
}
p = (struct priv *) dev->priv;
if(debuglevel > 1)
printk("I");
WAIT_4_SCB_CMD(); /* wait for last command */
while((stat=p->scb->cus & STAT_MASK))
{
p->scb->cmd_cuc = stat;
sun3_attn586();
if(stat & STAT_FR) /* received a frame */
sun3_82586_rcv_int(dev);
if(stat & STAT_RNR) /* RU went 'not ready' */
{
printk("(R)");
if(p->scb->rus & RU_SUSPEND) /* special case: RU_SUSPEND */
{
WAIT_4_SCB_CMD();
p->scb->cmd_ruc = RUC_RESUME;
sun3_attn586();
WAIT_4_SCB_CMD_RUC();
}
else
{
printk("%s: Receiver-Unit went 'NOT READY': %04x/%02x.\n",dev->name,(int) stat,(int) p->scb->rus);
sun3_82586_rnr_int(dev);
}
}
if(stat & STAT_CX) /* command with I-bit set complete */
sun3_82586_xmt_int(dev);
#ifndef NO_NOPCOMMANDS
if(stat & STAT_CNA) /* CU went 'not ready' */
{
if(netif_running(dev))
printk("%s: oops! CU has left active state. stat: %04x/%02x.\n",dev->name,(int) stat,(int) p->scb->cus);
}
#endif
if(debuglevel > 1)
printk("%d",cnt++);
WAIT_4_SCB_CMD(); /* wait for ack. (sun3_82586_xmt_int can be faster than ack!!) */
if(p->scb->cmd_cuc) /* timed out? */
{
printk("%s: Acknowledge timed out.\n",dev->name);
sun3_disint();
break;
}
}
if(debuglevel > 1)
printk("i");
return IRQ_HANDLED;
}
/*******************************************************
* receive-interrupt
*/
static void sun3_82586_rcv_int(struct net_device *dev)
{
int status,cnt=0;
unsigned short totlen;
struct sk_buff *skb;
struct rbd_struct *rbd;
struct priv *p = (struct priv *) dev->priv;
if(debuglevel > 0)
printk("R");
for(;(status = p->rfd_top->stat_high) & RFD_COMPL;)
{
rbd = (struct rbd_struct *) make32(p->rfd_top->rbd_offset);
if(status & RFD_OK) /* frame received without error? */
{
if( (totlen = swab16(rbd->status)) & RBD_LAST) /* the first and the last buffer? */
{
totlen &= RBD_MASK; /* length of this frame */
rbd->status = 0;
skb = (struct sk_buff *) dev_alloc_skb(totlen+2);
if(skb != NULL)
{
skb->dev = dev;
skb_reserve(skb,2);
skb_put(skb,totlen);
eth_copy_and_sum(skb,(char *) p->base+swab32((unsigned long) rbd->buffer),totlen,0);
skb->protocol=eth_type_trans(skb,dev);
netif_rx(skb);
p->stats.rx_packets++;
}
else
p->stats.rx_dropped++;
}
else
{
int rstat;
/* free all RBD's until RBD_LAST is set */
totlen = 0;
while(!((rstat=swab16(rbd->status)) & RBD_LAST))
{
totlen += rstat & RBD_MASK;
if(!rstat)
{
printk("%s: Whoops .. no end mark in RBD list\n",dev->name);
break;
}
rbd->status = 0;
rbd = (struct rbd_struct *) make32(rbd->next);
}
totlen += rstat & RBD_MASK;
rbd->status = 0;
printk("%s: received oversized frame! length: %d\n",dev->name,totlen);
p->stats.rx_dropped++;
}
}
else /* frame !(ok), only with 'save-bad-frames' */
{
printk("%s: oops! rfd-error-status: %04x\n",dev->name,status);
p->stats.rx_errors++;
}
p->rfd_top->stat_high = 0;
p->rfd_top->last = RFD_SUSP; /* maybe exchange by RFD_LAST */
p->rfd_top->rbd_offset = 0xffff;
p->rfd_last->last = 0; /* delete RFD_SUSP */
p->rfd_last = p->rfd_top;
p->rfd_top = (struct rfd_struct *) make32(p->rfd_top->next); /* step to next RFD */
p->scb->rfa_offset = make16(p->rfd_top);
if(debuglevel > 0)
printk("%d",cnt++);
}
if(automatic_resume)
{
WAIT_4_SCB_CMD();
p->scb->cmd_ruc = RUC_RESUME;
sun3_attn586();
WAIT_4_SCB_CMD_RUC();
}
#ifdef WAIT_4_BUSY
{
int i;
for(i=0;i<1024;i++)
{
if(p->rfd_top->status)
break;
DELAY_16();
if(i == 1023)
printk("%s: RU hasn't fetched next RFD (not busy/complete)\n",dev->name);
}
}
#endif
#if 0
if(!at_least_one)
{
int i;
volatile struct rfd_struct *rfds=p->rfd_top;
volatile struct rbd_struct *rbds;
printk("%s: received a FC intr. without having a frame: %04x %d\n",dev->name,status,old_at_least);
for(i=0;i< (p->num_recv_buffs+4);i++)
{
rbds = (struct rbd_struct *) make32(rfds->rbd_offset);
printk("%04x:%04x ",rfds->status,rbds->status);
rfds = (struct rfd_struct *) make32(rfds->next);
}
printk("\nerrs: %04x %04x stat: %04x\n",(int)p->scb->rsc_errs,(int)p->scb->ovrn_errs,(int)p->scb->status);
printk("\nerrs: %04x %04x rus: %02x, cus: %02x\n",(int)p->scb->rsc_errs,(int)p->scb->ovrn_errs,(int)p->scb->rus,(int)p->scb->cus);
}
old_at_least = at_least_one;
#endif
if(debuglevel > 0)
printk("r");
}
/**********************************************************
* handle 'Receiver went not ready'.
*/
static void sun3_82586_rnr_int(struct net_device *dev)
{
struct priv *p = (struct priv *) dev->priv;
p->stats.rx_errors++;
WAIT_4_SCB_CMD(); /* wait for the last cmd, WAIT_4_FULLSTAT?? */
p->scb->cmd_ruc = RUC_ABORT; /* usually the RU is in the 'no resource'-state .. abort it now. */
sun3_attn586();
WAIT_4_SCB_CMD_RUC(); /* wait for accept cmd. */
alloc_rfa(dev,(char *)p->rfd_first);
/* maybe add a check here, before restarting the RU */
startrecv586(dev); /* restart RU */
printk("%s: Receive-Unit restarted. Status: %04x\n",dev->name,p->scb->rus);
}
/**********************************************************
* handle xmit - interrupt
*/
static void sun3_82586_xmt_int(struct net_device *dev)
{
int status;
struct priv *p = (struct priv *) dev->priv;
if(debuglevel > 0)
printk("X");
status = swab16(p->xmit_cmds[p->xmit_last]->cmd_status);
if(!(status & STAT_COMPL))
printk("%s: strange .. xmit-int without a 'COMPLETE'\n",dev->name);
if(status & STAT_OK)
{
p->stats.tx_packets++;
p->stats.collisions += (status & TCMD_MAXCOLLMASK);
}
else
{
p->stats.tx_errors++;
if(status & TCMD_LATECOLL) {
printk("%s: late collision detected.\n",dev->name);
p->stats.collisions++;
}
else if(status & TCMD_NOCARRIER) {
p->stats.tx_carrier_errors++;
printk("%s: no carrier detected.\n",dev->name);
}
else if(status & TCMD_LOSTCTS)
printk("%s: loss of CTS detected.\n",dev->name);
else if(status & TCMD_UNDERRUN) {
p->stats.tx_fifo_errors++;
printk("%s: DMA underrun detected.\n",dev->name);
}
else if(status & TCMD_MAXCOLL) {
printk("%s: Max. collisions exceeded.\n",dev->name);
p->stats.collisions += 16;
}
}
#if (NUM_XMIT_BUFFS > 1)
if( (++p->xmit_last) == NUM_XMIT_BUFFS)
p->xmit_last = 0;
#endif
netif_wake_queue(dev);
}
/***********************************************************
* (re)start the receiver
*/
static void startrecv586(struct net_device *dev)
{
struct priv *p = (struct priv *) dev->priv;
WAIT_4_SCB_CMD();
WAIT_4_SCB_CMD_RUC();
p->scb->rfa_offset = make16(p->rfd_first);
p->scb->cmd_ruc = RUC_START;
sun3_attn586(); /* start cmd. */
WAIT_4_SCB_CMD_RUC(); /* wait for accept cmd. (no timeout!!) */
}
static void sun3_82586_timeout(struct net_device *dev)
{
struct priv *p = (struct priv *) dev->priv;
#ifndef NO_NOPCOMMANDS
if(p->scb->cus & CU_ACTIVE) /* COMMAND-UNIT active? */
{
netif_wake_queue(dev);
#ifdef DEBUG
printk("%s: strange ... timeout with CU active?!?\n",dev->name);
printk("%s: X0: %04x N0: %04x N1: %04x %d\n",dev->name,(int)swab16(p->xmit_cmds[0]->cmd_status),(int)swab16(p->nop_cmds[0]->cmd_status),(int)swab16(p->nop_cmds[1]->cmd_status),(int)p->nop_point);
#endif
p->scb->cmd_cuc = CUC_ABORT;
sun3_attn586();
WAIT_4_SCB_CMD();
p->scb->cbl_offset = make16(p->nop_cmds[p->nop_point]);
p->scb->cmd_cuc = CUC_START;
sun3_attn586();
WAIT_4_SCB_CMD();
dev->trans_start = jiffies;
return 0;
}
#endif
{
#ifdef DEBUG
printk("%s: xmitter timed out, try to restart! stat: %02x\n",dev->name,p->scb->cus);
printk("%s: command-stats: %04x %04x\n",dev->name,swab16(p->xmit_cmds[0]->cmd_status),swab16(p->xmit_cmds[1]->cmd_status));
printk("%s: check, whether you set the right interrupt number!\n",dev->name);
#endif
sun3_82586_close(dev);
sun3_82586_open(dev);
}
dev->trans_start = jiffies;
}
/******************************************************
* send frame