ref: 1c7e58e75bc6b5620984f164d66354350b28dfe0
dir: /sys/src/9/sgi/etherseeq.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/netif.h"
#include "../port/etherif.h"
typedef struct Hio Hio;
typedef struct Desc Desc;
typedef struct Ring Ring;
typedef struct Ctlr Ctlr;
/*
* SEEQ 8003 interfaced to HPC3 (very different from IP20)
*/
struct Hio
{
ulong unused0[20480];
ulong crbp; /* current receive buf desc ptr */
ulong nrbdp; /* next receive buf desc ptr */
ulong unused1[1022];
ulong rbc; /* receive byte count */
ulong rstat; /* receiver status */
ulong rgio; /* receive gio fifo ptr */
ulong rdev; /* receive device fifo ptr */
ulong unused2;
ulong ctl; /* interrupt, channel reset, buf oflow */
ulong dmacfg; /* dma configuration */
ulong piocfg; /* pio configuration */
ulong unused3[1016];
ulong cxbdp; /* current xmit buf desc ptr */
ulong nxbdp; /* next xmit buffer desc. pointer */
ulong unused4[1022];
ulong xbc; /* xmit byte count */
ulong xstat;
ulong xgio; /* xmit gio fifo ptr */
ulong xdev; /* xmit device fifo ptr */
ulong unused5[1020];
ulong crbdp; /* current receive descriptor ptr */
ulong unused6[2047];
ulong cpfxbdp; /* current/previous packet 1st xmit */
ulong ppfxbdp; /* desc ptr */
ulong unused7[59390];
ulong eaddr[6]; /* seeq station address wo */
ulong csr; /* seeq receiver cmd/status reg */
ulong csx; /* seeq transmitter cmd/status reg */
};
enum
{ /* ctl */
Cover= 0x08, /* receive buffer overflow */
Cnormal=0x00, /* 1=normal, 0=loopback */
Cint= 0x02, /* interrupt (write 1 to clear) */
Creset= 0x01, /* ethernet channel reset */
/* xstat */
Xdma= 0x200, /* dma active */
Xold= 0x080, /* register has been read */
Xok= 0x008, /* transmission was successful */
Xmaxtry=0x004, /* transmission failed after 16 attempts */
Xcoll= 0x002, /* transmission collided */
Xunder= 0x001, /* transmitter underflowed */
/* csx */
Xreg0= 0x00, /* access reg bank 0 incl station addr */
XIok= 0x08,
XImaxtry=0x04,
XIcoll= 0x02,
XIunder=0x01,
/* rstat */
Rlshort=0x800, /* [small len in received frame] */
Rdma= 0x200, /* dma active */
Rold= 0x80, /* register has been read */
Rok= 0x20, /* received good frame */
Rend= 0x10, /* received end of frame */
Rshort= 0x08, /* received short frame */
Rdrbl= 0x04, /* dribble error */
Rcrc= 0x02, /* CRC error */
Rover= 0x01, /* overflow error */
/* csr */
Rsmb= 0xc0, /* receive station/broadcast/multicast frames */
Rsb= 0x80, /* receive station/broadcast frames */
Rprom= 0x40, /* receive all frames */
RIok= 0x20, /* interrupt on good frame */
RIend= 0x10, /* interrupt on end of frame */
RIshort=0x08, /* interrupt on short frame */
RIdrbl= 0x04, /* interrupt on dribble error */
RIcrc= 0x02, /* interrupt on CRC error */
RIover= 0x01, /* interrupt on overflow error */
HPC_MODNORM= 0x0, /* mode: 0=normal, 1=loopback */
HPC_FIX_INTR= 0x8000, /* start timeout counter after */
HPC_FIX_EOP= 0x4000, /* rcv_eop_intr/eop_in_chip is set */
HPC_FIX_RXDC= 0x2000, /* clear eop status upon rxdc */
};
struct Desc
{
ulong addr; /* addr */
ulong count; /* eox / eop / busy / xie / count:13 */
ulong next;
uchar* base;
};
struct Ring
{
Rendez;
int size;
int free;
uchar* base;
Desc* head;
Desc* tail;
};
enum
{
Eor= 1<<31, /* end of ring */
Eop= 1<<30,
Ioc= 1<<29, /* interrupt on completion */
Busy= 1<<24,
Empty= 1<<14, /* no data here */
Done= 1<<15, /* transmit done */
};
enum {
Rbsize = ETHERMAXTU+3,
};
struct Ctlr
{
int attach;
char* txerr;
ulong txwdog;
Hio* io;
Ring rx;
Ring tx;
};
static void startup(Ether*);
static void shutdown(Ether*);
static void
txintr(Ctlr *ctlr)
{
Hio *io;
ulong s;
Desc *p;
io = ctlr->io;
s = io->xstat;
if((s & Xdma) != 0)
return;
if((s & Xmaxtry) != 0)
ctlr->txerr = "transmission failed";
if((s & Xunder) != 0)
ctlr->txerr = "transmitter underflowed";
for(p = IO(Desc, ctlr->tx.head->next); (p->count & Busy) != 0; p = IO(Desc, p->next)){
if((p->count & Done) == 0){
io->nxbdp = PADDR(p);
io->xstat = Xdma;
ctlr->txwdog = MACHP(0)->ticks;
break;
}
p->count = Eor|Eop;
ctlr->tx.head = p;
ctlr->tx.free++;
ctlr->txwdog = 0;
}
wakeup(&ctlr->tx);
}
static void
interrupt(Ureg *, void *arg)
{
Ether *edev;
Ctlr *ctlr;
Hio *io;
uint s;
edev = arg;
ctlr = edev->ctlr;
io = ctlr->io;
s = io->ctl;
if(s & Cover){
io->ctl = Cnormal | Cover;
edev->overflows++;
}
if(s & Cint) {
io->ctl = Cnormal | Cint;
txintr(ctlr);
wakeup(&ctlr->rx);
}
}
static int
notempty(void *arg)
{
Ctlr *ctlr = arg;
return (IO(Desc, ctlr->rx.head->next)->count & Empty) == 0;
}
static char*
checkerr(Ctlr *ctlr)
{
ulong t;
if(ctlr->txerr != nil)
return ctlr->txerr;
t = ctlr->txwdog;
if(t != 0 && TK2MS(MACHP(0)->ticks - t) > 1000)
return "transmitter dma timeout";
if((ctlr->io->rstat & Rdma) == 0)
return "recevier dma stopped";
return nil;
}
static void
rxproc(void *arg)
{
Ether *edev = arg;
Ctlr *ctlr;
char *err;
Block *b;
Desc *p;
int n;
while(waserror())
;
ctlr = edev->ctlr;
for(p = IO(Desc, ctlr->rx.head->next);; p = IO(Desc, p->next)){
while((p->count & Empty) != 0){
err = checkerr(ctlr);
if(err != nil){
print("%s: %s; reseting\n", up->text, err);
splhi();
shutdown(edev);
startup(edev);
spllo();
}
tsleep(&ctlr->rx, notempty, ctlr, 500);
}
n = Rbsize - (p->count & 0x3fff)-3;
if(n >= ETHERMINTU && (p->base[n+2] & Rok) != 0){
b = allocb(n);
b->wp += n;
memmove(b->rp, p->base+2, n);
etheriq(edev, b);
}
p->addr = PADDR(p->base);
p->count = Ioc|Empty|Rbsize;
ctlr->rx.head = p;
}
}
static int
notbusy(void *arg)
{
Ctlr *ctlr = arg;
return ctlr->tx.free > 0;
}
static void
txproc(void *arg)
{
Ether *edev = arg;
Ctlr *ctlr;
Block *b;
Desc *p;
int n;
while(waserror())
;
ctlr = edev->ctlr;
for(p = IO(Desc, ctlr->tx.tail->next); (b = qbread(edev->oq, 1000000)) != nil; p = IO(Desc, p->next)){
while(ctlr->tx.free == 0)
sleep(&ctlr->tx, notbusy, ctlr);
n = BLEN(b);
if(n > ETHERMAXTU)
n = ETHERMAXTU;
memmove(p->base, b->rp, n);
p->addr = PADDR(p->base);
p->count = Ioc|Eor|Eop|Busy|n;
ctlr->tx.tail->count &= ~(Ioc|Eor);
ctlr->tx.tail = p;
splhi();
ctlr->tx.free--;
txintr(ctlr);
spllo();
freeb(b);
}
}
static void
allocring(Ring *r, int n)
{
uchar *b;
Desc *p;
int m;
r->size = n;
r->free = n;
m = n*BY2PG/2;
b = xspanalloc(m, BY2PG, 0);
dcflush(b, m);
b = IO(uchar, b);
memset(b, 0, m);
r->base = b;
m = n*sizeof(Desc);
p = xspanalloc(m, BY2PG, 0);
dcflush(p, m);
p = IO(Desc, p);
memset(p, 0, m);
r->head = r->tail = p;
for(m=0; m<n; m++, p++, b += (BY2PG/2)){
p->base = b;
p->next = PADDR(p+1);
}
p[-1].next = PADDR(r->head);
}
static void
startup(Ether *edev)
{
Ctlr *ctlr;
Desc *p;
Hio *io;
int i;
ctlr = edev->ctlr;
io = ctlr->io;
io->dmacfg |= HPC_FIX_INTR | HPC_FIX_EOP | HPC_FIX_RXDC;
p = ctlr->rx.head;
do {
p->addr = PADDR(p->base);
p->count = Ioc|Empty|Rbsize;
p = IO(Desc, p->next);
} while(p != ctlr->rx.head);
io->crbdp = PADDR(p);
io->nrbdp = p->next;
ctlr->rx.tail = p;
ctlr->rx.free = ctlr->rx.size;
p = ctlr->tx.tail;
do {
p->addr = PADDR(p->base);
p->count = Eor|Eop;
p = IO(Desc, p->next);
} while(p != ctlr->tx.tail);
io->cxbdp = PADDR(p);
io->nxbdp = p->next;
ctlr->tx.head = p;
ctlr->tx.free = ctlr->tx.size;
for(i=0; i<6; i++)
io->eaddr[i] = edev->ea[i];
io->csx = XIok | XImaxtry | XIcoll | XIunder;
io->csr = Rprom | RIok|RIend|RIshort|RIdrbl|RIcrc;
io->rstat = Rdma;
wakeup(&ctlr->rx);
wakeup(&ctlr->tx);
}
static void
shutdown(Ether *edev)
{
Ctlr *ctlr = edev->ctlr;
Hio *io = ctlr->io;
ctlr->txerr = nil;
ctlr->txwdog = 0;
io->csx = Xreg0;
io->rstat = 0;
io->xstat = 0;
io->ctl = Cnormal | Creset | Cint;
delay(10);
io->ctl = Cnormal;
io->csx = 0;
io->csr = 0;
}
/*
* do nothing for promiscuous() and multicast() as we
* are always in promisc mode.
*/
static void
promiscuous(void*, int)
{
}
static void
multicast(void*, uchar*, int)
{
}
static void
attach(Ether *edev)
{
Ctlr *ctlr;
ctlr = edev->ctlr;
if(ctlr->attach)
return;
ctlr->attach = 1;
splhi();
startup(edev);
spllo();
kproc("#l0rx", rxproc, edev);
kproc("#l0tx", txproc, edev);
}
static int
pnp(Ether *edev)
{
static Ctlr ctlr0;
Ctlr *ctlr;
char *s;
/* only one controller */
if(edev->ctlrno != 0)
return -1;
/* get mac address from nvram */
if((s = getconf("eaddr")) != nil)
parseether(edev->ea, s);
ctlr = &ctlr0;
edev->ctlr = ctlr;
edev->port = HPC3_ETHER;
edev->irq = IRQENET;
edev->ctlr = ctlr;
edev->promiscuous = promiscuous;
edev->multicast = multicast;
edev->attach = attach;
edev->shutdown = shutdown;
edev->arg = edev;
edev->mbps = 10;
edev->link = 1;
ctlr->io = IO(Hio, edev->port);
allocring(&ctlr->rx, 256);
allocring(&ctlr->tx, 64);
shutdown(edev);
intrenable(hpc3irqlevel(edev->irq), interrupt, edev);
return 0;
}
void
etherseeqlink(void)
{
addethercard("seeq", pnp);
}