OpenCloudOS-Kernel/drivers/net/sun3_82586.c

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/*
* Sun3 i82586 Ethernet driver
*
* Cloned from ni52.c for the Sun3 by Sam Creasey (sammy@sammy.net)
*
* 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 (hippm@informatik.uni-tuebingen.de)
* --------------------------
*
* 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 */
#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);
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 21:55:46 +08:00
static irqreturn_t sun3_82586_interrupt(int irq,void *dev_id);
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);
}
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 __iomem *)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 ...
*/
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 21:55:46 +08:00
static irqreturn_t sun3_82586_interrupt(int irq,void *dev_id)
{
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_reserve(skb,2);
skb_put(skb,totlen);
skb_copy_to_linear_data(skb,(char *) p->base+swab32((unsigned long) rbd->buffer),totlen);
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
*/
static int sun3_82586_send_packet(struct sk_buff *skb, struct net_device *dev)
{
int len,i;
#ifndef NO_NOPCOMMANDS
int next_nop;
#endif
struct priv *p = (struct priv *) dev->priv;
if(skb->len > XMIT_BUFF_SIZE)
{
printk("%s: Sorry, max. framelength is %d bytes. The length of your frame is %d bytes.\n",dev->name,XMIT_BUFF_SIZE,skb->len);
return 0;
}
netif_stop_queue(dev);
#if(NUM_XMIT_BUFFS > 1)
if(test_and_set_bit(0,(void *) &p->lock)) {
printk("%s: Queue was locked\n",dev->name);
return 1;
}
else
#endif
{
len = skb->len;
if (len < ETH_ZLEN) {
memset((void *)p->xmit_cbuffs[p->xmit_count], 0,
ETH_ZLEN);
len = ETH_ZLEN;
}
skb_copy_from_linear_data(skb, (void *)p->xmit_cbuffs[p->xmit_count], skb->len);
#if (NUM_XMIT_BUFFS == 1)
# ifdef NO_NOPCOMMANDS
#ifdef DEBUG
if(p->scb->cus & CU_ACTIVE)
{
printk("%s: Hmmm .. CU is still running and we wanna send a new packet.\n",dev->name);
printk("%s: stat: %04x %04x\n",dev->name,p->scb->cus,swab16(p->xmit_cmds[0]->cmd_status));
}
#endif
p->xmit_buffs[0]->size = swab16(TBD_LAST | len);
for(i=0;i<16;i++)
{
p->xmit_cmds[0]->cmd_status = 0;
WAIT_4_SCB_CMD();
if( (p->scb->cus & CU_STATUS) == CU_SUSPEND)
p->scb->cmd_cuc = CUC_RESUME;
else
{
p->scb->cbl_offset = make16(p->xmit_cmds[0]);
p->scb->cmd_cuc = CUC_START;
}
sun3_attn586();
dev->trans_start = jiffies;
if(!i)
dev_kfree_skb(skb);
WAIT_4_SCB_CMD();
if( (p->scb->cus & CU_ACTIVE)) /* test it, because CU sometimes doesn't start immediately */
break;
if(p->xmit_cmds[0]->cmd_status)
break;
if(i==15)
printk("%s: Can't start transmit-command.\n",dev->name);
}
# else
next_nop = (p->nop_point + 1) & 0x1;
p->xmit_buffs[0]->size = swab16(TBD_LAST | len);
p->xmit_cmds[0]->cmd_link = p->nop_cmds[next_nop]->cmd_link
= make16((p->nop_cmds[next_nop]));
p->xmit_cmds[0]->cmd_status = p->nop_cmds[next_nop]->cmd_status = 0;
p->nop_cmds[p->nop_point]->cmd_link = make16((p->xmit_cmds[0]));
dev->trans_start = jiffies;
p->nop_point = next_nop;
dev_kfree_skb(skb);
# endif
#else
p->xmit_buffs[p->xmit_count]->size = swab16(TBD_LAST | len);
if( (next_nop = p->xmit_count + 1) == NUM_XMIT_BUFFS )
next_nop = 0;
p->xmit_cmds[p->xmit_count]->cmd_status = 0;
/* linkpointer of xmit-command already points to next nop cmd */
p->nop_cmds[next_nop]->cmd_link = make16((p->nop_cmds[next_nop]));
p->nop_cmds[next_nop]->cmd_status = 0;
p->nop_cmds[p->xmit_count]->cmd_link = make16((p->xmit_cmds[p->xmit_count]));
dev->trans_start = jiffies;
p->xmit_count = next_nop;
{
unsigned long flags;
local_irq_save(flags);
if(p->xmit_count != p->xmit_last)
netif_wake_queue(dev);
p->lock = 0;
local_irq_restore(flags);
}
dev_kfree_skb(skb);
#endif
}
return 0;
}
/*******************************************
* Someone wanna have the statistics
*/
static struct net_device_stats *sun3_82586_get_stats(struct net_device *dev)
{
struct priv *p = (struct priv *) dev->priv;
unsigned short crc,aln,rsc,ovrn;
crc = swab16(p->scb->crc_errs); /* get error-statistic from the ni82586 */
p->scb->crc_errs = 0;
aln = swab16(p->scb->aln_errs);
p->scb->aln_errs = 0;
rsc = swab16(p->scb->rsc_errs);
p->scb->rsc_errs = 0;
ovrn = swab16(p->scb->ovrn_errs);
p->scb->ovrn_errs = 0;
p->stats.rx_crc_errors += crc;
p->stats.rx_fifo_errors += ovrn;
p->stats.rx_frame_errors += aln;
p->stats.rx_dropped += rsc;
return &p->stats;
}
/********************************************************
* Set MC list ..
*/
static void set_multicast_list(struct net_device *dev)
{
netif_stop_queue(dev);
sun3_disint();
alloc586(dev);
init586(dev);
startrecv586(dev);
sun3_enaint();
netif_wake_queue(dev);
}
#ifdef MODULE
#error This code is not currently supported as a module
static struct net_device *dev_sun3_82586;
int init_module(void)
{
dev_sun3_82586 = sun3_82586_probe(-1);
if (IS_ERR(dev_sun3_82586))
return PTR_ERR(dev_sun3_82586);
return 0;
}
void cleanup_module(void)
{
unsigned long ioaddr = dev_sun3_82586->base_addr;
unregister_netdev(dev_sun3_82586);
release_region(ioaddr, SUN3_82586_TOTAL_SIZE);
iounmap((void *)ioaddr);
free_netdev(dev_sun3_82586);
}
#endif /* MODULE */
#if 0
/*
* DUMP .. we expect a not running CMD unit and enough space
*/
void sun3_82586_dump(struct net_device *dev,void *ptr)
{
struct priv *p = (struct priv *) dev->priv;
struct dump_cmd_struct *dump_cmd = (struct dump_cmd_struct *) ptr;
int i;
p->scb->cmd_cuc = CUC_ABORT;
sun3_attn586();
WAIT_4_SCB_CMD();
WAIT_4_SCB_CMD_RUC();
dump_cmd->cmd_status = 0;
dump_cmd->cmd_cmd = CMD_DUMP | CMD_LAST;
dump_cmd->dump_offset = make16((dump_cmd + 1));
dump_cmd->cmd_link = 0xffff;
p->scb->cbl_offset = make16(dump_cmd);
p->scb->cmd_cuc = CUC_START;
sun3_attn586();
WAIT_4_STAT_COMPL(dump_cmd);
if( (dump_cmd->cmd_status & (STAT_COMPL|STAT_OK)) != (STAT_COMPL|STAT_OK) )
printk("%s: Can't get dump information.\n",dev->name);
for(i=0;i<170;i++) {
printk("%02x ",(int) ((unsigned char *) (dump_cmd + 1))[i]);
if(i % 24 == 23)
printk("\n");
}
printk("\n");
}
#endif
MODULE_LICENSE("GPL");