NetBSD-5.0.2/sys/arch/i386/stand/lib/netif/am7990.c
/* $NetBSD: am7990.c,v 1.6 2007/03/04 05:59:59 christos Exp $ */
/* mostly from netbsd:sys/arch/i386/netboot/ne2100.c
memory allocation now 1 chunk, added deallocation
receive function changed - don't use irq
*/
/*
* source in this file came from
* the Mach ethernet boot written by Leendert van Doorn.
*
* A very simple network driver for NE2100 boards that polls.
*
* Copyright (c) 1992 by Leendert van Doorn
*/
#include <sys/types.h>
#include <machine/pio.h>
#include <lib/libkern/libkern.h>
#include <lib/libsa/stand.h>
#include <libi386.h>
#include "etherdrv.h"
#include "lance.h"
extern u_char eth_myaddr[6];
extern int lance_rap, lance_rdp;
static void *dmamem;
#define LA(adr) vtophys(adr)
/* Lance register offsets */
#define LA_CSR lance_rdp
#define LA_CSR1 lance_rdp
#define LA_CSR2 lance_rdp
#define LA_CSR3 lance_rdp
#define LA_RAP lance_rap
/*
* Some driver specific constants.
* Take care when tuning, this program only has 32 Kb
*/
#define LANCEBUFSIZE 1518 /* plus 4 CRC bytes */
#define MAXLOOP 1000000L /* arbitrary retry limit */
#define LOG2NRCVRING 2 /* log2(NRCVRING) */
#define NRCVRING (1 << LOG2NRCVRING)
static int next_rmd; /* next receive element */
static initblock_t *initblock; /* initialization block */
static tmde_t *tmd; /* transmit ring */
static rmde_t *rmd; /* receive ring */
static char rbuffer[NRCVRING][LANCEBUFSIZE]; /* receive buffers */
/*
* Stop ethernet board
*/
void am7990_stop()
{
long l;
/* stop chip and disable DMA access */
outw(LA_RAP, RDP_CSR0);
outw(LA_CSR, CSR_STOP);
for (l = 0; (inw(LA_CSR) & CSR_STOP) == 0; l++) {
if (l >= MAXLOOP) {
printf("Lance failed to stop\n");
return;
}
}
}
/*
* Reset ethernet board
*/
void am7990_init()
{
long l;
u_long addr;
int i;
/* initblock, tmd, and rmd should be 8 byte aligned;
sizes of initblock_t and tmde_t are multiples of 8 */
dmamem = alloc(sizeof(initblock_t) +
sizeof(tmde_t) + NRCVRING * sizeof(rmde_t) + 4);
/* +4 is ok because alloc()'s result is 4-byte aligned! */
initblock = (initblock_t *)(((unsigned long)dmamem + 4) & -8);
tmd = (tmde_t *)(initblock + 1);
rmd = (rmde_t *)(tmd + 1);
/* stop the chip, and make sure it did */
am7990_stop();
/* fill lance initialization block */
memset(initblock, 0, sizeof(initblock_t));
/* set my ethernet address */
for(i=0; i<6; i++)
initblock->ib_padr[i] = eth_myaddr[i];
/* receive ring pointer */
addr = LA(rmd);
initblock->ib_rdralow = (u_short)addr;
initblock->ib_rdrahigh = (u_char)(addr >> 16);
initblock->ib_rlen = LOG2NRCVRING << 5;
/* transmit ring with one element */
addr = LA(tmd);
initblock->ib_tdralow = (u_short)addr;
initblock->ib_tdrahigh = (u_char)(addr >> 16);
initblock->ib_tlen = 0 << 5;
/* setup the receive ring entries */
for (next_rmd = 0, i = 0; i < NRCVRING; i++) {
addr = LA(&rbuffer[i]);
rmd[i].rmd_ladr = (u_short)addr;
rmd[i].rmd_hadr = (u_char)(addr >> 16);
rmd[i].rmd_mcnt = 0;
rmd[i].rmd_bcnt = -LANCEBUFSIZE;
rmd[i].rmd_flags = RMD_OWN;
}
/* zero transmit ring */
memset(tmd, 0, sizeof(tmde_t));
/* give lance the init block */
addr = LA(initblock);
outw(LA_RAP, RDP_CSR1);
outw(LA_CSR1, (u_short)addr);
outw(LA_RAP, RDP_CSR2);
outw(LA_CSR2, (char)(addr >> 16));
outw(LA_RAP, RDP_CSR3);
outw(LA_CSR3, 0);
/* and initialize it */
outw(LA_RAP, RDP_CSR0);
outw(LA_CSR, CSR_INIT|CSR_STRT);
/* wait for the lance to complete initialization and fire it up */
for (l = 0; (inw(LA_CSR) & CSR_IDON) == 0; l++) {
if (l >= MAXLOOP) {
printf("Lance failed to initialize\n");
break;
}
}
for (l=0; (inw(LA_CSR)&(CSR_TXON|CSR_RXON))!=(CSR_TXON|CSR_RXON); l++) {
if (l >= MAXLOOP) {
printf("Lance not started\n");
break;
}
}
}
/*
* Stop ethernet board and free ressources
*/
void EtherStop()
{
am7990_stop();
dealloc(dmamem, sizeof(initblock_t) +
sizeof(tmde_t) + NRCVRING * sizeof(rmde_t) + 4);
}
/*
* Send an ethernet packet
*/
int EtherSend(pkt, len)
char *pkt;
int len;
{
long l;
u_long addr;
u_short csr;
int savlen = len;
if(len < 60)
len = 60;
if (len > LANCEBUFSIZE) {
printf("packet too long\n");
return(-1);
}
/* set up transmit ring element */
if(tmd->tmd_flags & TMD_OWN) {
printf("lesend: td busy, status=%x\n", tmd->tmd_flags);
return(-1);
}
addr = LA(pkt);
if(addr & 1) {
printf("unaligned data\n");
return(-1);
}
tmd->tmd_ladr = (u_short)addr;
tmd->tmd_hadr = (u_char)(addr >> 16);
tmd->tmd_bcnt = -len;
tmd->tmd_err = 0;
tmd->tmd_flags = TMD_OWN|TMD_STP|TMD_ENP;
/* start transmission */
outw(LA_CSR, CSR_TDMD);
/* wait for interrupt and acknowledge it */
for (l = 0; l < MAXLOOP; l++) {
if ((csr = inw(LA_CSR)) & CSR_TINT) {
outw(LA_CSR, CSR_TINT);
#ifdef LEDEBUG
if(tmd->tmd_flags & (TMD_ONE|TMD_MORE|TMD_ERR|TMD_DEF))
printf("lesend: status=%x\n", tmd->tmd_flags);
#endif
break;
}
delay(10); /* don't poll too much on PCI, seems
to disturb DMA on poor hardware */
}
return(savlen);
}
/*
* Poll the LANCE just see if there's an Ethernet packet
* available. If there is, its contents is returned.
*/
int EtherReceive(pkt, maxlen)
char *pkt;
int maxlen;
{
rmde_t *rp;
u_short csr;
int len = 0;
csr = inw(LA_CSR);
outw(LA_CSR, csr & (CSR_BABL | CSR_MISS | CSR_MERR | CSR_RINT));
if((next_rmd < 0) || (next_rmd >= NRCVRING)) {
printf("next_rmd bad\n");
return(0);
}
rp = &rmd[next_rmd];
if(rp->rmd_flags & RMD_OWN) return(0);
if(csr & (CSR_BABL | CSR_CERR | CSR_MISS | CSR_MERR))
printf("le: csr %x\n", csr);
if(rp->rmd_flags & (RMD_FRAM | RMD_OFLO | RMD_CRC | RMD_BUFF)) {
printf("le: rmd_flags %x\n", rp->rmd_flags);
goto cleanup;
}
if(rp->rmd_flags != (RMD_STP|RMD_ENP)) {
printf("le: rmd_flags %x\n", rp->rmd_flags);
return(-1);
}
len = rp->rmd_mcnt - 4;
if((len < 0) || (len >= LANCEBUFSIZE)) {
printf("bad pkt len\n");
return(-1);
}
if(len <= maxlen)
memcpy(pkt, rbuffer[next_rmd], len);
else
len = 0;
cleanup:
/* give packet back to the lance */
rp->rmd_bcnt = -LANCEBUFSIZE;
rp->rmd_mcnt = 0;
rp->rmd_flags = RMD_OWN;
next_rmd = (next_rmd + 1) & (NRCVRING - 1);
return(len);
}