ref: 75c92428225428c8fde2d015f010e608a0b12f1d
dir: /os/pc/ether79c960.c/
/*
* AM79C960
* PCnet Single-Chip Ethernet Controller for ISA Bus
* To do:
* only issue transmit interrupt if necessary?
* dynamically increase rings as necessary?
* use Blocks as receive buffers?
* currently hardwires 10Base-T
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
#include "../port/netif.h"
#include "etherif.h"
#define chatty 1
#define DPRINT if(chatty)print
enum {
Lognrdre = 6,
Nrdre = (1<<Lognrdre), /* receive descriptor ring entries */
Logntdre = 4,
Ntdre = (1<<Logntdre), /* transmit descriptor ring entries */
Rbsize = ETHERMAXTU+4, /* ring buffer size (+4 for CRC) */
};
enum { /* I/O resource map */
Aprom = 0x0000, /* physical address */
Rdp = 0x0010, /* register data port */
Rap = 0x0012, /* register address port */
Sreset = 0x0014, /* software reset */
/*Bdp = 0x001C, /* bus configuration register data port */
Idp = 0x0016, /* ISA data port */
};
enum { /* ISACSR2 */
Isa10 = 0x0001, /* 10base-T */
Isamedia = 0x0003, /* media selection mask */
Isaawake = 0x0004, /* Auto-Wake */
};
enum { /* CSR0 */
Init = 0x0001, /* begin initialisation */
Strt = 0x0002, /* enable chip */
Stop = 0x0004, /* disable chip */
Tdmd = 0x0008, /* transmit demand */
Txon = 0x0010, /* transmitter on */
Rxon = 0x0020, /* receiver on */
Iena = 0x0040, /* interrupt enable */
Intr = 0x0080, /* interrupt flag */
Idon = 0x0100, /* initialisation done */
Tint = 0x0200, /* transmit interrupt */
Rint = 0x0400, /* receive interrupt */
Merr = 0x0800, /* memory error */
Miss = 0x1000, /* missed frame */
Cerr = 0x2000, /* collision */
Babl = 0x4000, /* transmitter timeout */
Err = 0x8000, /* Babl|Cerr|Miss|Merr */
};
enum { /* CSR3 */
Emba = 0x0008, /* enable modified back-off algorithm */
Dxmt2pd = 0x0010, /* disable transmit two part deferral */
Lappen = 0x0020, /* look-ahead packet processing enable */
Idonm = 0x0100, /* initialisation done mask */
Tintm = 0x0200, /* transmit interrupt mask */
Rintm = 0x0400, /* receive interrupt mask */
Merrm = 0x0800, /* memory error mask */
Missm = 0x1000, /* missed frame mask */
Bablm = 0x4000, /* babl mask */
};
enum { /* CSR4 */
ApadXmt = 0x0800, /* auto pad transmit */
};
enum { /* CSR15 */
Prom = 0x8000, /* promiscuous mode */
TenBaseT = 0x0080, /* 10Base-T */
};
typedef struct { /* Initialisation Block */
ushort mode;
uchar padr[6];
uchar ladr[8];
ushort rdra0; /* bits 0-15 */
uchar rdra16; /* bits 16-23 */
uchar rlen; /* upper 3 bits */
ushort tdra0; /* bits 0-15 */
uchar tdra16; /* bits 16-23 */
uchar tlen; /* upper 3 bits */
} Iblock;
typedef struct { /* receive descriptor ring entry */
ushort rbadr; /* buffer address 0-15 */
ushort rmd1; /* status|buffer address 16-23 */
ushort rmd2; /* bcnt */
ushort rmd3; /* mcnt */
} Rdre;
typedef struct { /* transmit descriptor ring entry */
ushort tbadr; /* buffer address 0-15 */
ushort tmd1; /* status|buffer address 16-23 */
ushort tmd2; /* bcnt */
ushort tmd3; /* errors */
} Tdre;
enum { /* [RT]dre status bits */
Enp = 0x0100, /* end of packet */
Stp = 0x0200, /* start of packet */
RxBuff = 0x0400, /* buffer error */
TxDef = 0x0400, /* deferred */
RxCrc = 0x0800, /* CRC error */
TxOne = 0x0800, /* one retry needed */
RxOflo = 0x1000, /* overflow error */
TxMore = 0x1000, /* more than one retry needed */
Fram = 0x2000, /* framing error */
RxErr = 0x4000, /* Fram|Oflo|Crc|RxBuff */
TxErr = 0x4000, /* Uflo|Lcol|Lcar|Rtry */
Own = 0x8000,
};
typedef struct {
Lock;
int init; /* initialisation in progress */
Iblock iblock;
Rdre* rdr; /* receive descriptor ring */
void* rrb; /* receive ring buffers */
int rdrx; /* index into rdr */
Tdre* tdr; /* transmit descriptor ring */
void* trb; /* transmit ring buffers */
int tdrx; /* index into tdr */
} Ctlr;
static void
attach(Ether* ether)
{
Ctlr *ctlr;
int port;
ctlr = ether->ctlr;
ilock(ctlr);
if(ctlr->init){
iunlock(ctlr);
return;
}
port = ether->port;
outs(port+Rdp, Iena|Strt);
iunlock(ctlr);
}
static void
ringinit(Ctlr* ctlr)
{
int i, x;
/*
* Initialise the receive and transmit buffer rings. The ring
* entries must be aligned on 16-byte boundaries.
*
* This routine is protected by ctlr->init.
*/
if(ctlr->rdr == 0)
ctlr->rdr = xspanalloc(Nrdre*sizeof(Rdre), 0x10, 0);
if(ctlr->rrb == 0)
ctlr->rrb = xalloc(Nrdre*Rbsize);
x = PADDR(ctlr->rrb);
if ((x >> 24)&0xFF)
panic("ether79c960: address>24bit");
for(i = 0; i < Nrdre; i++){
ctlr->rdr[i].rbadr = x&0xFFFF;
ctlr->rdr[i].rmd1 = Own|(x>>16)&0xFF;
x += Rbsize;
ctlr->rdr[i].rmd2 = 0xF000|-Rbsize&0x0FFF;
ctlr->rdr[i].rmd3 = 0;
}
ctlr->rdrx = 0;
if(ctlr->tdr == 0)
ctlr->tdr = xspanalloc(Ntdre*sizeof(Tdre), 0x10, 0);
if(ctlr->trb == 0)
ctlr->trb = xalloc(Ntdre*Rbsize);
x = PADDR(ctlr->trb);
if ((x >> 24)&0xFF)
panic("ether79c960: address>24bit");
for(i = 0; i < Ntdre; i++){
ctlr->tdr[i].tbadr = x&0xFFFF;
ctlr->tdr[i].tmd1 = (x>>16)&0xFF;
x += Rbsize;
ctlr->tdr[i].tmd2 = 0xF000|-Rbsize&0x0FFF;
}
ctlr->tdrx = 0;
}
static void
promiscuous(void* arg, int on)
{
Ether *ether;
int port, x;
Ctlr *ctlr;
ether = arg;
port = ether->port;
ctlr = ether->ctlr;
/*
* Put the chip into promiscuous mode. First we must wait until
* anyone transmitting is done, then we can stop the chip and put
* it in promiscuous mode. Restarting is made harder by the chip
* reloading the transmit and receive descriptor pointers with their
* base addresses when Strt is set (unlike the older Lance chip),
* so the rings must be re-initialised.
*/
ilock(ctlr);
if(ctlr->init){
iunlock(ctlr);
return;
}
ctlr->init = 1;
iunlock(ctlr);
outs(port+Rdp, Stop);
outs(port+Rap, 15);
x = ins(port+Rdp) & ~Prom;
if(on)
x |= Prom; /* BUG: multicast ... */
outs(port+Rdp, x);
outs(port+Rap, 0);
ringinit(ctlr);
ilock(ctlr);
ctlr->init = 0;
outs(port+Rdp, Iena|Strt);
iunlock(ctlr);
}
static int
owntdre(void* arg)
{
return (((Tdre*)arg)->tmd1 & Own) == 0;
}
static void
txstart(Ether *ether)
{
int port;
Ctlr *ctlr;
Tdre *tdre;
Etherpkt *pkt;
Block *bp;
int n;
port = ether->port;
ctlr = ether->ctlr;
if(ctlr->init)
return;
/*
* Take the next transmit buffer, if it is free.
*/
tdre = &ctlr->tdr[ctlr->tdrx];
if(owntdre(tdre) == 0)
return;
bp = qget(ether->oq);
if(bp == nil)
return;
/*
* Copy the packet to the transmit buffer and fill in our
* source ethernet address. There's no need to pad to ETHERMINTU
* here as we set ApadXmit in CSR4.
*/
n = BLEN(bp);
pkt = KADDR(tdre->tbadr|(tdre->tmd1&0xFF)<<16);
memmove(pkt->d, bp->rp, n);
memmove(pkt->s, ether->ea, sizeof(pkt->s));
freeb(bp);
/*
* Give ownership of the descriptor to the chip, increment the
* software ring descriptor pointer and tell the chip to poll.
*/
tdre->tmd3 = 0;
tdre->tmd2 = 0xF000|(-n)&0x0FFF;
tdre->tmd1 |= Own|Stp|Enp;
ctlr->tdrx = NEXT(ctlr->tdrx, Ntdre);
outs(port+Rdp, Iena|Tdmd);
ether->outpackets++;
}
static void
transmit(Ether *ether)
{
Ctlr *ctlr;
ctlr = ether->ctlr;
ilock(ctlr);
txstart(ether);
iunlock(ctlr);
}
static void
interrupt(Ureg*, void* arg)
{
Ether *ether;
int port, csr0, status;
Ctlr *ctlr;
Rdre *rdre;
Etherpkt *pkt;
Block *bp;
int len;
ether = arg;
port = ether->port;
ctlr = ether->ctlr;
/*
* Acknowledge all interrupts and whine about those that shouldn't
* happen.
*/
csr0 = ins(port+Rdp);
outs(port+Rdp, Babl|Cerr|Miss|Merr|Rint|Tint|Iena);
if(csr0 & (Babl|Miss|Merr))
print("AMD70C960#%d: csr0 = 0x%uX\n", ether->ctlrno, csr0);
/*
* Receiver interrupt: run round the descriptor ring logging
* errors and passing valid receive data up to the higher levels
* until we encounter a descriptor still owned by the chip.
*/
if(csr0 & Rint){
rdre = &ctlr->rdr[ctlr->rdrx];
while(((status = rdre->rmd1) & Own) == 0){
if(status & RxErr){
if(status & RxBuff)
ether->buffs++;
if(status & RxCrc)
ether->crcs++;
if(status & RxOflo)
ether->overflows++;
}
else {
len = (rdre->rmd3 & 0x0FFF)-4;
if((bp = iallocb(len)) != nil){
ether->inpackets++;
pkt = KADDR(rdre->rbadr|(rdre->rmd1&0xFF)<<16);
memmove(bp->wp, pkt, len);
bp->wp += len;
etheriq(ether, bp, 1);
}
}
/*
* Finished with this descriptor, reinitialise it,
* give it back to the chip, then on to the next...
*/
rdre->rmd3 = 0;
rdre->rmd2 = 0xF000|-Rbsize&0x0FFF;
rdre->rmd1 |= Own;
ctlr->rdrx = NEXT(ctlr->rdrx, Nrdre);
rdre = &ctlr->rdr[ctlr->rdrx];
}
}
/*
* Transmitter interrupt: start next block if waiting for free descriptor.
*/
if(csr0 & Tint){
lock(ctlr);
txstart(ether);
unlock(ctlr);
}
}
static int
reset(Ether* ether)
{
int port, x, i;
uchar ea[Eaddrlen];
Ctlr *ctlr;
if(ether->port == 0)
ether->port = 0x300;
if(ether->irq == 0)
ether->irq = 10;
if(ether->irq == 2)
ether->irq = 9;
if(ether->dma == 0)
ether->dma = 5;
port = ether->port;
if(port == 0 || ether->dma == 0)
return -1;
/*
* Allocate a controller structure and start to fill in the
* initialisation block (must be DWORD aligned).
*/
ether->ctlr = malloc(sizeof(Ctlr));
ctlr = ether->ctlr;
ilock(ctlr);
ctlr->init = 1;
/*
* Set the auto pad transmit in CSR4.
*/
/*outs(port+Rdp, 0x00);/**/
ins(port+Sreset); /**/
delay(1);
outs(port+Rap, 0);
outs(port+Rdp, Stop);
outs(port+Rap, 4);
x = ins(port+Rdp) & 0xFFFF;
outs(port+Rdp, ApadXmt|x);
outs(port+Rap, 0);
/*
* Check if we are going to override the adapter's station address.
* If not, read it from the I/O-space and set in ether->ea prior to loading the
* station address in the initialisation block.
*/
memset(ea, 0, Eaddrlen);
if(memcmp(ea, ether->ea, Eaddrlen) == 0){
for(i=0; i<6; i++)
ether->ea[i] = inb(port + Aprom + i);
}
ctlr->iblock.rlen = Lognrdre<<5;
ctlr->iblock.tlen = Logntdre<<5;
memmove(ctlr->iblock.padr, ether->ea, sizeof(ctlr->iblock.padr));
ringinit(ctlr);
x = PADDR(ctlr->rdr);
ctlr->iblock.rdra0 = x&0xFFFF;
ctlr->iblock.rdra16 = (x >> 16)&0xFF;
x = PADDR(ctlr->tdr);
ctlr->iblock.tdra0 = x&0xFFFF;
ctlr->iblock.tdra16 = (x >> 16)&0xFF;
/*
* set the DMA controller to cascade mode for bus master
*/
switch(ether->dma){
case 5:
outb(0xd6, 0xc1); outb(0xd4, 1); break;
case 6:
outb(0xd6, 0xc2); outb(0xd4, 2); break;
case 7:
outb(0xd6, 0xc3); outb(0xd4, 3); break;
}
/*
* Ensure 10Base-T (for now)
*/
ctlr->iblock.mode = TenBaseT;
outs(port+Rap, 2);
x = ins(port+Idp);
x &= ~Isamedia;
x |= Isa10;
x |= Isaawake;
outs(port+Idp, x);
/*
* Point the chip at the initialisation block and tell it to go.
* Mask the Idon interrupt and poll for completion. Strt and interrupt
* enables will be set later when we're ready to attach to the network.
*/
x = PADDR(&ctlr->iblock);
if((x>>24)&0xFF)
panic("ether79c960: address>24bit");
outs(port+Rap, 1);
outs(port+Rdp, x & 0xFFFF);
outs(port+Rap, 2);
outs(port+Rdp, (x>>16) & 0xFF);
outs(port+Rap, 3);
outs(port+Rdp, Idonm);
outs(port+Rap, 0);
outs(port+Rdp, Init);
while((ins(port+Rdp) & Idon) == 0)
;
outs(port+Rdp, Idon|Stop);
ctlr->init = 0;
iunlock(ctlr);
ether->port = port;
ether->attach = attach;
ether->transmit = transmit;
ether->interrupt = interrupt;
ether->ifstat = 0;
ether->promiscuous = promiscuous;
ether->arg = ether;
return 0;
}
void
ether79c960link(void)
{
addethercard("AMD79C960", reset);
}