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NetBSD/sys/arch/i386/netboot/wd80x3.c

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/* $NetBSD: wd80x3.c,v 1.4 1994/10/27 04:21:28 cgd Exp $ */
/*
* source in this file came from
* the Mach ethernet boot written by Leendert van Doorn.
*
* A very simple network driver for WD80x3 boards that polls.
*
* Copyright (c) 1992 by Leendert van Doorn
*/
#include "proto.h"
#include "assert.h"
#include "packet.h"
#include "ether.h"
#include "dp8390.h"
/* configurable parameters */
#define WD_BASEREG 0x280 /* base register */
/* the base address doesn't have to be particularly accurate - the
board seems to pick up on addresses in the range a0000..effff.
*/
#define WD_BASEMEM 0xd0000 /* base ram */
/* bit definitions for board features */
#define INTERFACE_CHIP 01 /* has an WD83C583 interface chip */
#define BOARD_16BIT 02 /* 16 bit board */
#define SLOT_16BIT 04 /* 16 bit slot */
/* register offset definitions */
#define WD_MSR 0x00 /* control (w) and status (r) */
#define WD_REG0 0x00 /* generic register definitions */
#define WD_REG1 0x01
#define WD_REG2 0x02
#define WD_REG3 0x03
#define WD_REG4 0x04
#define WD_REG5 0x05
#define WD_REG6 0x06
#define WD_REG7 0x07
#define WD_EA0 0x08 /* most significant addr byte */
#define WD_EA1 0x09
#define WD_EA2 0x0A
#define WD_EA3 0x0B
#define WD_EA4 0x0C
#define WD_EA5 0x0D /* least significant addr byte */
#define WD_LTB 0x0E /* LAN type byte */
#define WD_CHKSUM 0x0F /* sum from WD_EA0 upto here is 0xFF */
#define WD_DP8390 0x10 /* natsemi chip */
/* bits in control register */
#define WD_MSR_MEMMASK 0x3F /* memory enable bits mask */
#define WD_MSR_MENABLE 0x40 /* memory enable */
#define WD_MSR_RESET 0x80 /* software reset */
/* bits in bus size register */
#define WD_BSR_16BIT 0x01 /* 16 bit bus */
/* bits in LA address register */
#define WD_LAAR_A19 0x01 /* address lines for above 1Mb ram */
#define WD_LAAR_LAN16E 0x40 /* enables 16bit shrd RAM for LAN */
#define WD_LAAR_MEM16E 0x80 /* enables 16bit shrd RAM for host */
u_char eth_myaddr[ETH_ADDRSIZE];
static int boardid;
static dpconf_t dpc;
/*
* Determine whether wd8003 hardware performs register aliasing
* (i.e. whether it is an old WD8003E board).
*/
static int
Aliasing(void) {
if (inb(WD_BASEREG + WD_REG1) != inb(WD_BASEREG + WD_EA1))
return 0;
if (inb(WD_BASEREG + WD_REG2) != inb(WD_BASEREG + WD_EA2))
return 0;
if (inb(WD_BASEREG + WD_REG3) != inb(WD_BASEREG + WD_EA3))
return 0;
if (inb(WD_BASEREG + WD_REG4) != inb(WD_BASEREG + WD_EA4))
return 0;
if (inb(WD_BASEREG + WD_REG7) != inb(WD_BASEREG + WD_CHKSUM))
return 0;
return 1;
}
/*
* This trick is stolen from the clarkson packet driver
TBD - this is _ugly_ bogus! should use system timer
*/
static void
LongPause(void) {
short i;
for (i = 1600; i > 0; i++)
(void) inb(0x61);
}
/*
* Determine whether this board has 16-bit capabilities
*/
static int
BoardIs16Bit(void) {
u_char bsreg = inb(WD_BASEREG + WD_REG1);
outb(WD_BASEREG + WD_REG1, bsreg ^ WD_BSR_16BIT);
LongPause();
if (inb(WD_BASEREG + WD_REG1) == bsreg) {
/*
* Pure magic: LTB is 0x05 indicates that this is a WD8013EB board,
* 0x27 indicates that this is an WD8013 Elite board, and 0x29
* indicates an SMC Elite 16 board.
*/
u_char tlb = inb(WD_BASEREG + WD_LTB);
return tlb == 0x05 || tlb == 0x27 || tlb == 0x29;
}
outb(WD_BASEREG + WD_REG1, bsreg);
return 1;
}
/*
* Determine whether the 16 bit capable board is plugged
* into a 16 bit slot.
*/
static int
SlotIs16Bit(void) {
return inb(WD_BASEREG + WD_REG1) & WD_BSR_16BIT;
}
/*
* Reset ethernet board after a timeout
*/
void
EtherReset(void) {
int dpreg = dpc.dc_reg;
/* initialize the board */
outb(WD_BASEREG + WD_MSR,
WD_MSR_MENABLE | (((u_long)WD_BASEMEM >> 13) & WD_MSR_MEMMASK));
/* reset dp8390 ethernet chip */
outb(dpreg + DP_CR, CR_STP|CR_DM_ABORT);
/* initialize first register set */
outb(dpreg + DP_IMR, 0);
outb(dpreg + DP_CR, CR_PS_P0|CR_STP|CR_DM_ABORT);
outb(dpreg + DP_TPSR, dpc.dc_tpsr);
outb(dpreg + DP_PSTART, dpc.dc_pstart);
outb(dpreg + DP_PSTOP, dpc.dc_pstop);
outb(dpreg + DP_BNRY, dpc.dc_pstart);
outb(dpreg + DP_RCR, RCR_MON);
outb(dpreg + DP_TCR, TCR_NORMAL|TCR_OFST);
if (boardid & SLOT_16BIT)
outb(dpreg + DP_DCR, DCR_WORDWIDE|DCR_8BYTES);
else
outb(dpreg + DP_DCR, DCR_BYTEWIDE|DCR_8BYTES);
outb(dpreg + DP_RBCR0, 0);
outb(dpreg + DP_RBCR1, 0);
outb(dpreg + DP_ISR, 0xFF);
/* initialize second register set */
outb(dpreg + DP_CR, CR_PS_P1|CR_DM_ABORT);
outb(dpreg + DP_PAR0, eth_myaddr[0]);
outb(dpreg + DP_PAR1, eth_myaddr[1]);
outb(dpreg + DP_PAR2, eth_myaddr[2]);
outb(dpreg + DP_PAR3, eth_myaddr[3]);
outb(dpreg + DP_PAR4, eth_myaddr[4]);
outb(dpreg + DP_PAR5, eth_myaddr[5]);
outb(dpreg + DP_CURR, dpc.dc_pstart+1);
/* and back to first register set */
outb(dpreg + DP_CR, CR_PS_P0|CR_DM_ABORT);
outb(dpreg + DP_RCR, RCR_AB);
/* flush counters */
(void) inb(dpreg + DP_CNTR0);
(void) inb(dpreg + DP_CNTR1);
(void) inb(dpreg + DP_CNTR2);
/* and go ... */
outb(dpreg + DP_CR, CR_STA|CR_DM_ABORT);
}
/*
* Initialize the WD80X3 board
*/
int
EtherInit(void) {
unsigned sum;
int memsize;
/* reset the ethernet card */
outb(WD_BASEREG + WD_MSR, WD_MSR_RESET);
LongPause();
outb(WD_BASEREG + WD_MSR, 0);
/* determine whether the controller is there */
sum = inb(WD_BASEREG + WD_EA0) + inb(WD_BASEREG + WD_EA1) +
inb(WD_BASEREG + WD_EA2) + inb(WD_BASEREG + WD_EA3) +
inb(WD_BASEREG + WD_EA4) + inb(WD_BASEREG + WD_EA5) +
inb(WD_BASEREG + WD_LTB) + inb(WD_BASEREG + WD_CHKSUM);
if ((sum & 0xFF) != 0xFF)
return 0;
/*
* Determine the type of board
*/
boardid = 0;
if (!Aliasing()) {
if (BoardIs16Bit()) {
boardid |= BOARD_16BIT;
if (SlotIs16Bit())
boardid |= SLOT_16BIT;
}
}
memsize = (boardid & BOARD_16BIT) ? 0x4000 : 0x2000; /* 16 or 8 Kb */
/* special setup needed for WD8013 boards */
if (boardid & SLOT_16BIT)
outb(WD_BASEREG + WD_REG5, WD_LAAR_A19|WD_LAAR_LAN16E);
/* get ethernet address */
eth_myaddr[0] = inb(WD_BASEREG + WD_EA0);
eth_myaddr[1] = inb(WD_BASEREG + WD_EA1);
eth_myaddr[2] = inb(WD_BASEREG + WD_EA2);
eth_myaddr[3] = inb(WD_BASEREG + WD_EA3);
eth_myaddr[4] = inb(WD_BASEREG + WD_EA4);
eth_myaddr[5] = inb(WD_BASEREG + WD_EA5);
/* save settings for future use */
dpc.dc_reg = WD_BASEREG + WD_DP8390;
dpc.dc_mem = WD_BASEMEM;
dpc.dc_tpsr = 0;
dpc.dc_pstart = 6;
dpc.dc_pstop = (memsize >> 8) & 0xFF;
printf("Using wd80x3 board, port 0x%x, iomem 0x%x, iosiz %d\n", WD_BASEREG, WD_BASEMEM, memsize);
EtherReset();
return 1;
}
/*
* Stop ethernet board
*/
void
EtherStop(void) {
/* stop dp8390, followed by a board reset */
outb(dpc.dc_reg + DP_CR, CR_STP|CR_DM_ABORT);
outb(WD_BASEREG + WD_MSR, WD_MSR_RESET);
outb(WD_BASEREG + WD_MSR, 0);
}
/* TBD - all users must take care to use the current "data seg" value
when moving data from/to the controller */
static void
WdCopy(u_long src, u_long dst, u_long count) {
#if TRACE > 0
printf("WdCopy from %x to %x for %d\n", src, dst, count);
#endif
assert(count <= 1514);
if (boardid & SLOT_16BIT)
outb(WD_BASEREG + WD_REG5,
WD_LAAR_MEM16E|WD_LAAR_LAN16E|WD_LAAR_A19);
PhysBcopy(src, dst, count);
if (boardid & SLOT_16BIT)
outb(WD_BASEREG + WD_REG5, WD_LAAR_LAN16E|WD_LAAR_A19);
}
/*
* Send an ethernet packet to destination 'dest'
*/
void
EtherSend(packet_t *pkt, u_short proto, u_char *dest) {
ethhdr_t *ep;
pkt->pkt_len += sizeof(ethhdr_t);
pkt->pkt_offset -= sizeof(ethhdr_t);
ep = (ethhdr_t *) pkt->pkt_offset;
ep->eth_proto = htons(proto);
bcopy((char *)dest, (char *)ep->eth_dst, ETH_ADDRSIZE);
bcopy((char *)eth_myaddr, (char *)ep->eth_src, ETH_ADDRSIZE);
#if 0
DUMP_STRUCT("ethhdr_t", ep, sizeof(ethhdr_t));
#endif
if (pkt->pkt_len < 60)
pkt->pkt_len = 60;
#if TRACE > 0
{
int i;
DUMP_STRUCT("EtherSend: pkt", pkt->pkt_offset, pkt->pkt_len);
#if 0
for(i=0; i<(pkt->pkt_len<MDUMP?pkt->pkt_len:MDUMP); i++) printe("%x ", *((u_char*)(pkt->pkt_offset)+i));
printe("\n");
#endif
}
#endif
#if 0
printe("EtherSend: WdCopy from %x to %x for %d\n", LA(pkt->pkt_offset), dpc.dc_mem + (dpc.dc_tpsr << 8), (u_long)pkt->pkt_len);
#endif
WdCopy(LA(pkt->pkt_offset),
dpc.dc_mem + (dpc.dc_tpsr << 8), (u_long)pkt->pkt_len);
outb(dpc.dc_reg + DP_TPSR, dpc.dc_tpsr);
outb(dpc.dc_reg + DP_TBCR0, (pkt->pkt_len & 0xFF));
outb(dpc.dc_reg + DP_TBCR1, (pkt->pkt_len >> 8) & 0xFF);
outb(dpc.dc_reg + DP_CR, CR_TXP);
#if 0
printe("Ethersend: outb(%x, %x)\n", dpc.dc_reg + DP_TPSR, dpc.dc_tpsr);
printe("Ethersend: outb(%x, %x)\n", dpc.dc_reg + DP_TBCR0, (pkt->pkt_len & 0xFF));
printe("Ethersend: outb(%x, %x)\n", dpc.dc_reg + DP_TBCR1, (pkt->pkt_len >> 8) & 0xFF);
printe("Ethersend: outb(%x, %x)\n", dpc.dc_reg + DP_CR, CR_TXP);
#endif
}
/*
* Copy dp8390 packet header for observation
*/
static void
GetHeader(u_long haddr, dphdr_t *dph) {
#if TRACE > 0
printe("GetHeader: WdCopy from %x to %x for %d\n", haddr, LA(dph), sizeof(dphdr_t));
#endif
WdCopy(haddr, LA(dph), sizeof(dphdr_t));
#if 0
DUMP_STRUCT("GetHeader: dphdr_t", dph, sizeof(dphdr_t));
#endif
}
/*
* Poll the dp8390 just see if there's an Ethernet packet
* available. If there is, its contents is returned in a
* pkt structure, otherwise a nil pointer is returned.
*/
packet_t *
EtherReceive(void) {
u_char pageno, curpage, nextpage;
int dpreg = dpc.dc_reg;
packet_t *pkt;
dphdr_t dph;
u_long addr;
pkt = (packet_t *)0;
if (inb(dpreg + DP_RSR) & RSR_PRX) {
/* get current page numbers */
pageno = inb(dpreg + DP_BNRY) + 1;
if (pageno == dpc.dc_pstop)
pageno = dpc.dc_pstart;
outb(dpreg + DP_CR, CR_PS_P1);
curpage = inb(dpreg + DP_CURR);
outb(dpreg + DP_CR, CR_PS_P0);
if (pageno == curpage)
return (packet_t *) 0;
/* get packet header */
addr = dpc.dc_mem + (pageno << 8);
GetHeader(addr, &dph);
nextpage = dph.dh_next;
/* allocate packet */
pkt = PktAlloc(0);
#if 0
printe("EtherReceive: allocated pkt %x\n", pkt);
#endif
pkt->pkt_len = ((dph.dh_rbch & 0xFF) << 8) | (dph.dh_rbcl & 0xFF);
pkt->pkt_len -= sizeof(dphdr_t);
if (pkt->pkt_len > 1514) /* bug in dp8390 */
pkt->pkt_len = 1514;
#if TRACE > 0
{
int i;
printe("EtherReceive %d bytes: ", pkt->pkt_len);
#if 0
for(i=0; i<(pkt->pkt_len<MDUMP?pkt->pkt_len:MDUMP); i++) printe("%x ", *((u_char*)pkt+i));
#else
DUMP_STRUCT("", pkt, pkt->pkt_len);
#endif
printe("\n");
}
#endif
/*
* The dp8390 maintains a circular buffer of pages (256 bytes)
* in which incomming ethernet packets are stored. The following
* if detects wrap arounds, and copies the ethernet packet to
* our local buffer in two chunks if necesarry.
*/
assert(pkt->pkt_offset);
assert(pkt->pkt_len <= (6 << 8));
if (nextpage < pageno && nextpage > dpc.dc_pstart) {
u_long nbytes = ((dpc.dc_pstop - pageno) << 8) - sizeof(dphdr_t);
assert(nbytes <= (6 << 8));
#if TRACE > 0
printe("EtherReceive1: WdCopy from %x to %x for %x\n", addr + sizeof(dphdr_t), LA(pkt->pkt_offset), nbytes);
#endif
WdCopy(addr + sizeof(dphdr_t),
LA(pkt->pkt_offset), nbytes);
if ((pkt->pkt_len - nbytes) > 0)
/* TBD - this OK? */
#if TRACE > 0
printe("EtherReceive2: WdCopy from %x to %x for %x\n",dpc.dc_mem + (dpc.dc_pstart << 8), LA(pkt->pkt_offset) + nbytes, pkt->pkt_len - nbytes);
#endif
WdCopy(dpc.dc_mem + (dpc.dc_pstart << 8),
LA(pkt->pkt_offset) + nbytes,
pkt->pkt_len - nbytes);
} else {
#if TRACE > 0
printe("EtherReceive3: WdCopy from %x to %x for %x\n", addr + sizeof(dphdr_t), LA(pkt->pkt_offset), (u_long)pkt->pkt_len);
#endif
WdCopy(addr + sizeof(dphdr_t),
LA(pkt->pkt_offset), (u_long)pkt->pkt_len);
}
/* release occupied pages */
if (nextpage == dpc.dc_pstart)
nextpage = dpc.dc_pstop;
outb(dpreg + DP_BNRY, nextpage - 1);
}
return pkt;
}
/*
* Print an ethernet address in human readable form
*/
void
EtherPrintAddr(u_char *addr) {
printf("%x:%x:%x:%x:%x:%x",
addr[0] & 0xFF, addr[1] & 0xFF, addr[2] & 0xFF,
addr[3] & 0xFF, addr[4] & 0xFF, addr[5] & 0xFF);
}
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