ref: 75c92428225428c8fde2d015f010e608a0b12f1d
dir: /os/cerf1110/ether8900.c/
/*
* Crystal CS8900 ethernet controller
*
* Todo:
* - promiscuous
*
* Copyright © 1998 Vita Nuova Limited. All rights reserved.
* Revisions Copyright © 2000,2003 Vita Nuova Holdings Limited. All rights reserved.
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/netif.h"
#include "etherif.h"
typedef struct Ctlr Ctlr;
/*
* The CS8900 can be addressed from either ISA I/O space
* or ISA memory space at the following virtual addresses,
* depending on the hardware's wiring. MEMORY controls
* use of memory space.
* The cs8900 address pins are shifted by 1 relative to the CPU.
*/
enum {//18000000
IsaIOBase = 0x08000000,
IsaMemBase = 0xe0000000,
IOBase = 0x300,
MemBase = 0xc0000,
MEMORY = 0, /* set non-zero if memory mode to be used */
DORESET = 1, /* send soft-reset during initialisation */
DEBUG = 0,
};
#define IOSHIFT 0 /* was 2 */
#define IOREG(r) (IsaIOBase+((IOBase+(r))<<IOSHIFT))
/* I/O accesses */
#define out16(port, val) (*((ushort *)IOREG(port)) = (val))
#define in16(port) *((ushort *)IOREG(port))
#define in8(port) *((uchar *)IOREG(port))
#define regIOw(reg, val) do {out16(PpPtr, (reg)|0x3000); out16(PpData, val);} while(0)
#define regIOr(reg) (out16(PpPtr, (reg)|0x3000), in16(PpData))
#define regIOr1(reg) (out16(PpPtr, (reg)|0x3000), in16(PpData1))
/* Memory accesses */
#define REGW(reg, val) *((ushort *)IsaMemBase + MemBase + (reg)) = (val)
#define REGR(reg) *((ushort *)IsaMemBase + MemBase + (reg))
enum { /* I/O Mode Register Offsets */
RxTxData = 0x00, /* receive/transmit data - port 0 */
RxTxData1 = 0x02, /* r/t data port 1 */
TxCmdIO = 0x04, /* transmit command */
TxLenIO = 0x06, /* transmit length */
IsqIO = 0x08, /* Interrupt status queue */
PpPtr = 0x0a, /* packet page pointer */
PpData = 0x0c, /* packet page data */
PpData1 = 0x0e, /* packet page data - port 1*/
};
enum { /* Memory Mode Register Offsets */
/* Bus Interface Registers */
Ern = 0x0000, /* EISA registration numberion */
Pic = 0x0002, /* Product identification code */
Iob = 0x0020, /* I/O base address */
Intr = 0x0022, /* interrupt number */
Mba = 0x002c, /* memory base address */
Ecr = 0x0040, /* EEPROM command register */
Edw = 0x0042, /* EEPROM data word */
Rbc = 0x0050, /* receive frame byte counter */
/* Status and Control Registers */
RxCfg = 0x0102,
RxCtl = 0x0104,
TxCfg = 0x0106,
BufCfg = 0x010a,
LineCtl = 0x0112,
SelfCtl = 0x0114,
BusCtl = 0x0116,
TestCtl = 0x0118,
Isq = 0x0120,
RxEvent = 0x0124,
TxEvent = 0x0128,
BufEvent = 0x012c,
RxMISS = 0x0130,
TxCol = 0x0132,
LineSt = 0x0134,
SelfSt = 0x0136,
BusSt = 0x0138,
Tdr = 0x013c,
/* Initiate Transmit Registers */
TxCmd = 0x0144, /* transmit command */
TxLen = 0x0146, /* transmit length */
/* Address Filter Registers */
IndAddr = 0x0158, /* individual address registers */
/* Frame Location */
RxStatus = 0x0400, /* receive status */
RxLen = 0x0402, /* receive length */
RxFrame = 0x0404, /* receive frame location */
TxFrame = 0x0a00, /* transmit frame location */
};
enum { /* Ecr */
Addr = 0x00ff, /* EEPROM word address (field) */
Opcode = 0x0300, /* command opcode (field) */
EEread = 0x0200,
EEwrite = 0x0100,
};
enum { /* Isq */
Regnum = 0x003f, /* register number held by Isq (field) */
IsqRxEvent = 0x04,
IsqTxEvent = 0x08,
IsqBufEvent = 0x0c,
IsqRxMiss = 0x10,
IsqTxCol = 0x12,
RegContent = 0xffc0, /* register data contents (field) */
};
enum { /* RxCfg */
Skip_1 = 0x0040,
StreamE = 0x0080,
RxOKiE = 0x0100,
RxDMAonly = 0x0200,
AutoRxDMAE = 0x0400,
BufferCRC = 0x0800,
CRCerroriE = 0x1000,
RuntiE = 0x2000,
ExtradataiE = 0x4000,
};
enum { /* RxEvent */
IAHash = 0x0040,
Dribblebits = 0x0080,
RxOK = 0x0100,
Hashed = 0x0200,
IndividualAdr = 0x0400,
Broadcast = 0x0800,
CRCerror = 0x1000,
Runt = 0x2000,
Extradata = 0x4000,
};
enum { /* RxCtl */
IAHashA = 0x0040,
PromiscuousA = 0x0080,
RxOKA = 0x0100,
MulticastA = 0x0200,
IndividualA = 0x0400,
BroadcastA = 0x0800,
CRCerrorA = 0x1000,
RuntA = 0x2000,
ExtradataA = 0x4000,
};
enum { /* TxCfg */
LossofCRSiE = 0x0040,
SQEerroriE = 0x0080,
TxOKiE = 0x0100,
OutofWindowiE = 0x0200,
JabberiE = 0x0400,
AnycolliE = 0x0800,
Coll16iE = 0x8000,
};
enum { /* TxEvent */
LossofCRS = 0x0040,
SQEerror = 0x0080,
TxOK = 0x0100,
OutofWindow = 0x0200,
Jabber = 0x0400,
NTxCols = 0x7800, /* number of Tx collisions (field) */
coll16 = 0x8000,
};
enum { /* BufCfg */
SWintX = 0x0040,
RxDMAiE = 0x0080,
Rdy4TxiE = 0x0100,
TxUnderruniE = 0x0200,
RxMissiE = 0x0400,
Rx128iE = 0x0800,
TxColOvfiE = 0x1000,
MissOvfloiE = 0x2000,
RxDestiE = 0x8000,
};
enum { /* BufEvent */
SWint = 0x0040,
RxDMAFrame = 0x0080,
Rdy4Tx = 0x0100,
TxUnderrun = 0x0200,
RxMiss = 0x0400,
Rx128 = 0x0800,
RxDest = 0x8000,
};
enum { /* RxMiss */
MissCount = 0xffc0,
};
enum { /* TxCol */
ColCount = 0xffc0,
};
enum { /* LineCtl */
SerRxOn = 0x0040,
SerTxOn = 0x0080,
Iface = 0x0300, /* (field) 01 - AUI, 00 - 10BASE-T, 10 - Auto select */
ModBackoffE = 0x0800,
PolarityDis = 0x1000,
DefDis = 0x2000,
LoRxSquelch = 0x4000,
};
enum { /* LineSt */
LinkOK = 0x0080,
AUI = 0x0100,
TenBT = 0x0200,
PolarityOK = 0x1000,
CRS = 0x4000,
};
enum { /* SelfCtl */
RESET = 0x0040,
SWSuspend = 0x0100,
HWSleepE = 0x0200,
HWStandbyE = 0x0400,
};
enum { /* SelfSt */
Active3V = 0x0040,
INITD = 0x0080,
SIBUSY = 0x0100,
EepromPresent = 0x0200,
EepromOK = 0x0400,
ElPresent = 0x0800,
EeSize = 0x1000,
};
enum { /* BusCtl */
ResetRxDMA = 0x0040,
UseSA = 0x0200,
MemoryE = 0x0400,
DMABurst = 0x0800,
EnableIRQ = 0x8000,
};
enum { /* BusST */
TxBidErr = 0x0080,
Rdy4TxNOW = 0x0100,
};
enum { /* TestCtl */
FDX = 0x4000, /* full duplex */
};
enum { /* TxCmd */
TxStart = 0x00c0, /* bytes before transmit starts (field) */
TxSt5 = 0x0000, /* start after 5 bytes */
TxSt381 = 0x0040, /* start after 381 bytes */
TxSt1021 = 0x0080, /* start after 1021 bytes */
TxStAll = 0x00c0, /* start after the entire frame is in the cs8900 */
Force = 0x0100,
Onecoll = 0x0200,
InhibitCRC = 0x1000,
TxPadDis = 0x2000,
};
enum { /* EEPROM format */
Edataoff = 0x1C, /* start of data (ether address) */
Edatalen = 0x14, /* data count in 16-bit words */
};
struct Ctlr {
Lock;
Block* waiting; /* waiting for space in FIFO */
int model;
int rev;
ulong collisions;
};
static void
regw(int reg, int val)
{
if(DEBUG)
print("r%4.4ux <- %4.4ux\n", reg, val);
if(MEMORY){
REGW(reg, val);
}else{
out16(PpPtr, reg);
out16(PpData, val);
}
}
static int
regr(int reg)
{
int v;
if(MEMORY)
return REGR(reg);
out16(PpPtr, reg);
v = in16(PpData);
if(DEBUG)
print("r%4.4ux = %4.4ux\n", reg, v);
return v;
}
/*
* copy frames in and out, accounting for shorts aligned as longs in IO memory
*/
static void
copypktin(void *ad, int len)
{
ushort *s, *d;
int ns;
if(!MEMORY){
d = ad;
/*
* contrary to data sheet DS271PP3 pages 77-78,
* the data is not preceded by status & length
* perhaps because it has been read directly.
*/
for(ns = len>>1; --ns >= 0;)
*d++ = in16(RxTxData);
if(len & 1)
*(uchar*)d = in16(RxTxData);
return;
}
d = ad;
s = (ushort*)IsaMemBase + MemBase + RxFrame;
for(ns = len>>1; --ns >= 0;){
*d++ = *s;
s += 2;
}
if(len & 1)
*(uchar*)d = *s;
}
static void
copypktout(void *as, int len)
{
ushort *s, *d;
int ns;
if(!MEMORY){
s = as;
ns = (len+1)>>1;
while(--ns >= 0)
out16(RxTxData, *s++);
return;
}
s = as;
d = (ushort*)IsaMemBase + MemBase + TxFrame;
ns = (len+1)>>1;
while(--ns >= 0){
*d = *s++;
d += 2;
}
}
static long
ifstat(Ether* ether, void* a, long n, ulong offset)
{
Ctlr *ctlr;
char *p;
int len;
if(n == 0)
return 0;
ctlr = ether->ctlr;
p = malloc(READSTR);
len = snprint(p, READSTR, "Overflow: %ud\n", ether->overflows);
len += snprint(p+len, READSTR-len, "CRC Error: %ud\n", ether->crcs);
snprint(p+len, READSTR-len, "Collision Seen: %lud\n", ctlr->collisions);
n = readstr(offset, a, n, p);
free(p);
return n;
}
static void
promiscuous(void* arg, int on)
{
USED(arg, on);
}
static void
attach(Ether *ether)
{
int reg;
USED(ether);
/* enable transmit and receive */
reg = regr(BusCtl);
regw(BusCtl, reg|EnableIRQ);
reg = regr(LineCtl);
regw(LineCtl, reg|SerRxOn|SerTxOn);
if(DEBUG){
iprint("bus=%4.4ux line=%4.4ux\n", regr(BusCtl), regr(LineCtl));
iprint("rc=%4.4ux tc=%4.4ux bc=%4.4ux\n", regr(RxCfg), regr(TxCfg), regr(BufCfg));
}
}
static void
txstart(Ether *ether, int dowait)
{
int len, status;
Ctlr *ctlr;
Block *b;
ctlr = ether->ctlr;
for(;;){
if((b = ctlr->waiting) == nil){
if((b = qget(ether->oq)) == nil)
break;
}else{
if(!dowait)
break;
ctlr->waiting = nil;
}
len = BLEN(b);
if(MEMORY){
regw(TxCmd, TxSt381);
regw(TxLen, len);
}else{
out16(TxCmdIO, TxStAll);
out16(TxLenIO, len);
}
status = regr(BusSt);
if((status & Rdy4TxNOW) == 0) {
ctlr->waiting = b;
break;
}
/*
* Copy the packet to the transmit buffer.
*/
copypktout(b->rp, len);
freeb(b);
}
}
static void
transmit(Ether *ether)
{
Ctlr *ctlr;
ctlr = ether->ctlr;
ilock(ctlr);
txstart(ether, 0);
iunlock(ctlr);
}
static void
interrupt(Ureg*, void *arg)
{
Ether *ether;
Ctlr *ctlr;
int len, events, status;
Block *b;
ether = arg;
ctlr = ether->ctlr;
ilock(ctlr);
while((events = (MEMORY?regr(Isq):in16(IsqIO))) != 0) {
status = events&RegContent;
if(DEBUG)
iprint("status %4.4ux event %4.4ux\n", status, events);
switch(events&Regnum) {
case IsqBufEvent:
if(status&Rdy4Tx) {
if((b = ctlr->waiting) != nil){
ctlr->waiting = nil;
copypktout(b->rp, BLEN(b));
freeb(b);
/* wait for IsqTxEvent to send remaining packets in txstart */
}else
txstart(ether, 0);
}
break;
case IsqRxEvent:
if(status&RxOK) {
len = regr(RxLen);
if(DEBUG)
iprint("rxlen=%d\n", len);
if((b = iallocb(len)) != 0) {
copypktin(b->wp, len);
b->wp += len;
etheriq(ether, b, 1);
}
}
break;
case IsqTxEvent:
if(status&TxOK)
txstart(ether, 1);
break;
case IsqRxMiss:
ether->overflows++;
break;
case IsqTxCol:
ctlr->collisions++;
break;
}
}
iunlock(ctlr);
}
static int
eepromwait(void)
{
int i;
for(i=0; i<100000; i++)
if((regIOr(SelfSt) & SIBUSY) == 0)
return 0;
return -1;
}
static int
eepromrd(void *buf, int off, int n)
{
int i;
ushort *p;
p = buf;
n /= 2;
for(i=0; i<n; i++){
if(eepromwait() < 0)
return -1;
regIOw(Ecr, EEread | (off+i));
if(eepromwait() < 0)
return -1;
p[i] = regIOr(Edw);
}
return 0;
}
static int
reset(Ether* ether)
{
int i, reg, easet;
uchar ea[Eaddrlen];
ushort buf[Edatalen];
Ctlr *ctlr;
if(!MEMORY)
mmuphysmap(IsaIOBase, 64*1024);
delay(120); /* allow time for chip to reset */
if(0){
*(ushort*)IsaIOBase = 0xDEAD; /* force rubbish on bus */
for(i=0; i<100; i++){
if(in16(PpPtr) == 0x3000)
break;
delay(1);
}
if(i>=100){
iprint("failed init: reg(0xA): %4.4ux, should be 0x3000\n", in16(PpPtr));
return -1;
}
}
iprint("8900: %4.4ux (selfst) %4.4ux (linest)\n", regIOr(SelfSt), regIOr(LineSt));
iprint("8900: %4.4ux %4.4ux\n", regIOr(Ern), regIOr(Pic));
/*
* Identify the chip by reading the Pic register.
* The EISA registration number is in the low word
* and the product identification code in the high code.
* The ERN for Crystal Semiconductor is 0x630e.
* Bits 0-7 and 13-15 of the Pic should be zero for a CS8900.
*/
if(regIOr(Ern) != 0x630e || (regIOr(Pic) & 0xe0ff) != 0)
return -1;
if(ether->ctlr == nil)
ether->ctlr = malloc(sizeof(Ctlr));
ctlr = ether->ctlr;
reg = regIOr(Pic);
ctlr->model = reg>>14;
ctlr->rev = (reg >> 8) & 0x1F;
ether->mbps = 10;
memset(ea, 0, Eaddrlen);
easet = memcmp(ea, ether->ea, Eaddrlen);
memset(buf, 0, sizeof(buf));
if(regIOr(SelfSt) & EepromPresent) { /* worth a look */
if(eepromrd(buf, Edataoff, sizeof(buf)) >= 0){
for(i=0; i<3; i++){
ether->ea[2*i] = buf[i];
ether->ea[2*i+1] = buf[i] >> 8;
}
easet = 1;
}else
iprint("cs8900: can't read EEPROM\n");
}
if(!easet){
iprint("cs8900: ethernet address not configured\n");
return -1;
}
memmove(ea, ether->ea, Eaddrlen);
if(DORESET){
/*
* Reset the chip and ensure 16-bit mode operation
*/
regIOw(SelfCtl, RESET);
delay(10);
i=in8(PpPtr); USED(i);
i=in8(PpPtr+1); USED(i);
i=in8(PpPtr); USED(i);
i=in8(PpPtr+1); USED(i);
/*
* Wait for initialisation and EEPROM reads to complete
*/
i=0;
for(;;) {
short st = regIOr(SelfSt);
if((st&SIBUSY) == 0 && st&INITD)
break;
if(i++ > 1000000)
panic("cs8900: initialisation failed");
}
}
if(MEMORY){
/*
* Enable memory mode operation.
*/
regIOw(Mba, MemBase & 0xffff);
regIOw(Mba+2, MemBase >> 16);
regIOw(BusCtl, MemoryE|UseSA);
}
/*
* Enable 10BASE-T half duplex, transmit in interrupt mode
*/
reg = regr(LineCtl);
regw(LineCtl, reg&~Iface);
reg = regr(TestCtl);
if(ether->fullduplex)
regw(TestCtl, reg|FDX);
else
regw(TestCtl, reg&~FDX);
regw(BufCfg, Rdy4TxiE|TxUnderruniE);
regw(TxCfg, TxOKiE|AnycolliE|LossofCRSiE|Coll16iE);
regw(RxCfg, RxOKiE|CRCerroriE|RuntiE|ExtradataiE);
regw(RxCtl, RxOKA|IndividualA|BroadcastA);
for(i=0; i<Eaddrlen; i+=2)
regw(IndAddr+i, ea[i] | (ea[i+1] << 8));
/* IRQ tied to INTRQ0 */
regw(Intr, 0);
/*
* Linkage to the generic ethernet driver.
*/
ether->attach = attach;
ether->transmit = transmit;
ether->interrupt = interrupt;
ether->ifstat = ifstat;
ether->arg = ether;
ether->promiscuous = promiscuous;
ether->itype = BusGPIOrising; /* TO DO: this shouldn't be done here */
return 0;
}
void
ether8900link(void)
{
addethercard("CS8900", reset);
}