ref: f0b565742993646ac2c7939e3a89f44c2515fbe6
dir: /os/boot/pc/ether8003.c/
#include "u.h"
#include "lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "etherif.h"
#include "ether8390.h"
/*
* Western Digital/Standard Microsystems Corporation cards (WD80[01]3).
* Also handles 8216 cards (Elite Ultra).
* Configuration code based on that provided by SMC a long time ago.
*/
enum { /* 83C584 Bus Interface Controller */
Msr = 0x00, /* Memory Select Register */
Icr = 0x01, /* Interface Configuration Register */
Iar = 0x02, /* I/O Address Register */
Bio = 0x03, /* BIOS ROM Address Register */
Ear = 0x03, /* EEROM Address Register (shared with Bio) */
Irr = 0x04, /* Interrupt Request Register */
Hcr = 0x04, /* 8216 hardware control */
Laar = 0x05, /* LA Address Register */
Ijr = 0x06, /* Initialisation Jumpers */
Gp2 = 0x07, /* General Purpose Data Register */
Lar = 0x08, /* LAN Address Registers */
Id = 0x0E, /* Card ID byte */
Cksum = 0x0F, /* Checksum */
};
enum { /* Msr */
Rst = 0x80, /* software reset */
Menb = 0x40, /* memory enable */
};
enum { /* Icr */
Bit16 = 0x01, /* 16-bit bus */
Other = 0x02, /* other register access */
Ir2 = 0x04, /* IR2 */
Msz = 0x08, /* SRAM size */
Rla = 0x10, /* recall LAN address */
Rx7 = 0x20, /* recall all but I/O and LAN address */
Rio = 0x40, /* recall I/O address from EEROM */
Sto = 0x80, /* non-volatile EEROM store */
};
enum { /* Laar */
ZeroWS16 = 0x20, /* zero wait states for 16-bit ops */
L16en = 0x40, /* enable 16-bit LAN operation */
M16en = 0x80, /* enable 16-bit memory access */
};
enum { /* Ijr */
Ienable = 0x01, /* 8216 interrupt enable */
};
/*
* Mapping from configuration bits to interrupt level.
*/
static int irq8003[8] = {
9, 3, 5, 7, 10, 11, 15, 4,
};
static int irq8216[8] = {
0, 9, 3, 5, 7, 10, 11, 15,
};
static void
reset8003(Ether* ether, uchar ea[Eaddrlen], uchar ic[8])
{
Dp8390 *ctlr;
ulong port;
ctlr = ether->ctlr;
port = ether->port;
/*
* Check for old, dumb 8003E, which doesn't have an interface
* chip. Only Msr exists out of the 1st eight registers, reads
* of the others just alias the 2nd eight registers, the LAN
* address ROM. Can check Icr, Irr and Laar against the ethernet
* address read above and if they match it's an 8003E (or an
* 8003EBT, 8003S, 8003SH or 8003WT, doesn't matter), in which
* case the default irq gets used.
*/
if(memcmp(&ea[1], &ic[1], 5) == 0){
memset(ic, 0, sizeof(ic));
ic[Msr] = (((ulong)ether->mem)>>13) & 0x3F;
}
else{
/*
* As a final sanity check for the 8013EBT, which doesn't have
* the 83C584 interface chip, but has 2 real registers, write Gp2
* and if it reads back the same, it's not an 8013EBT.
*/
outb(port+Gp2, 0xAA);
inb(port+Msr); /* wiggle bus */
if(inb(port+Gp2) != 0xAA){
memset(ic, 0, sizeof(ic));
ic[Msr] = (((ulong)ether->mem)>>13) & 0x3F;
}
else
ether->irq = irq8003[((ic[Irr]>>5) & 0x3)|(ic[Icr] & 0x4)];
/*
* Check if 16-bit card.
* If Bit16 is read/write, then it's an 8-bit card.
* If Bit16 is set, it's in a 16-bit slot.
*/
outb(port+Icr, ic[Icr]^Bit16);
inb(port+Msr); /* wiggle bus */
if((inb(port+Icr) & Bit16) == (ic[Icr] & Bit16)){
ctlr->width = 2;
ic[Icr] &= ~Bit16;
}
outb(port+Icr, ic[Icr]);
if(ctlr->width == 2 && (inb(port+Icr) & Bit16) == 0)
ctlr->width = 1;
}
ether->mem = (ulong)KADDR((ic[Msr] & 0x3F)<<13);
if(ctlr->width == 2)
ether->mem |= (ic[Laar] & 0x1F)<<19;
else
ether->mem |= 0x80000;
if(ic[Icr] & (1<<3))
ether->size = 32*1024;
if(ctlr->width == 2)
ether->size <<= 1;
/*
* Enable interface RAM, set interface width.
*/
outb(port+Msr, ic[Msr]|Menb);
if(ctlr->width == 2)
outb(port+Laar, ic[Laar]|L16en|M16en|ZeroWS16);
}
static void
reset8216(Ether* ether, uchar[8])
{
uchar hcr, irq, x;
ulong addr, port;
Dp8390 *ctlr;
ctlr = ether->ctlr;
port = ether->port;
ctlr->width = 2;
/*
* Switch to the alternate register set and retrieve the memory
* and irq information.
*/
hcr = inb(port+Hcr);
outb(port+Hcr, 0x80|hcr);
addr = inb(port+0x0B) & 0xFF;
irq = inb(port+0x0D);
outb(port+Hcr, hcr);
ether->mem = (ulong)KADDR(0xC0000+((((addr>>2) & 0x30)|(addr & 0x0F))<<13));
ether->size = 8192*(1<<((addr>>4) & 0x03));
ether->irq = irq8216[((irq>>4) & 0x04)|((irq>>2) & 0x03)];
/*
* Enable interface RAM, set interface width, and enable interrupts.
*/
x = inb(port+Msr) & ~Rst;
outb(port+Msr, Menb|x);
x = inb(port+Laar);
outb(port+Laar, M16en|x);
outb(port+Ijr, Ienable);
}
/*
* Get configuration parameters, enable memory.
* There are opportunities here for buckets of code, try to resist.
*/
int
wd8003reset(Ether* ether)
{
int i;
uchar ea[Eaddrlen], ic[8], id, nullea[Eaddrlen], sum;
ulong port;
Dp8390 *ctlr;
/*
* Set up the software configuration.
* Use defaults for port, irq, mem and size if not specified.
* Defaults are set for the dumb 8003E which can't be
* autoconfigured.
*/
if(ether->port == 0)
ether->port = 0x280;
if(ether->irq == 0)
ether->irq = 3;
if(ether->mem == 0)
ether->mem = 0xD0000;
if(ether->size == 0)
ether->size = 8*1024;
/*
* Look for the interface. Read the LAN address ROM
* and validate the checksum - the sum of all 8 bytes
* should be 0xFF.
* At the same time, get the (possible) interface chip
* registers, they'll be used later to check for aliasing.
*/
port = ether->port;
sum = 0;
for(i = 0; i < sizeof(ea); i++){
ea[i] = inb(port+Lar+i);
sum += ea[i];
ic[i] = inb(port+i);
}
id = inb(port+Id);
sum += id;
sum += inb(port+Cksum);
if(sum != 0xFF)
return -1;
ether->ctlr = malloc(sizeof(Dp8390));
ctlr = ether->ctlr;
ctlr->ram = 1;
if((id & 0xFE) == 0x2A)
reset8216(ether, ic);
else
reset8003(ether, ea, ic);
/*
* Set the DP8390 ring addresses.
*/
ctlr->port = port+0x10;
ctlr->tstart = 0;
ctlr->pstart = HOWMANY(sizeof(Etherpkt), Dp8390BufSz);
ctlr->pstop = HOWMANY(ether->size, Dp8390BufSz);
/*
* Finally, init the 8390, set the ethernet address
* and claim the memory used.
*/
dp8390reset(ether);
memset(nullea, 0, Eaddrlen);
if(memcmp(nullea, ether->ea, Eaddrlen) == 0){
for(i = 0; i < sizeof(ether->ea); i++)
ether->ea[i] = ea[i];
}
dp8390setea(ether);
if(umbrwmalloc(PADDR(ether->mem), ether->size, 0) == 0)
print("ether8003: warning - 0x%luX unavailable", PADDR(ether->mem));
return 0;
}