ref: 76f5318cbd58fbe2bfc8cb51856bfa217c673bb7
dir: /os/boot/pc/ether8390.c/
/*
* National Semiconductor DP8390 and clone
* Network Interface Controller.
*/
#include "u.h"
#include "lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "etherif.h"
#include "ether8390.h"
enum { /* NIC core registers */
Cr = 0x00, /* command register, all pages */
/* Page 0, read */
Clda0 = 0x01, /* current local DMA address 0 */
Clda1 = 0x02, /* current local DMA address 1 */
Bnry = 0x03, /* boundary pointer (R/W) */
Tsr = 0x04, /* transmit status register */
Ncr = 0x05, /* number of collisions register */
Fifo = 0x06, /* FIFO */
Isr = 0x07, /* interrupt status register (R/W) */
Crda0 = 0x08, /* current remote DMA address 0 */
Crda1 = 0x09, /* current remote DMA address 1 */
Rsr = 0x0C, /* receive status register */
Cntr0 = 0x0D, /* frame alignment errors */
Cntr1 = 0x0E, /* CRC errors */
Cntr2 = 0x0F, /* missed packet errors */
/* Page 0, write */
Pstart = 0x01, /* page start register */
Pstop = 0x02, /* page stop register */
Tpsr = 0x04, /* transmit page start address */
Tbcr0 = 0x05, /* transmit byte count register 0 */
Tbcr1 = 0x06, /* transmit byte count register 1 */
Rsar0 = 0x08, /* remote start address register 0 */
Rsar1 = 0x09, /* remote start address register 1 */
Rbcr0 = 0x0A, /* remote byte count register 0 */
Rbcr1 = 0x0B, /* remote byte count register 1 */
Rcr = 0x0C, /* receive configuration register */
Tcr = 0x0D, /* transmit configuration register */
Dcr = 0x0E, /* data configuration register */
Imr = 0x0F, /* interrupt mask */
/* Page 1, read/write */
Par0 = 0x01, /* physical address register 0 */
Curr = 0x07, /* current page register */
Mar0 = 0x08, /* multicast address register 0 */
};
enum { /* Cr */
Stp = 0x01, /* stop */
Sta = 0x02, /* start */
Txp = 0x04, /* transmit packet */
Rd0 = 0x08, /* remote DMA command */
Rd1 = 0x10,
Rd2 = 0x20,
RdREAD = Rd0, /* remote read */
RdWRITE = Rd1, /* remote write */
RdSEND = Rd1|Rd0, /* send packet */
RdABORT = Rd2, /* abort/complete remote DMA */
Ps0 = 0x40, /* page select */
Ps1 = 0x80,
Page0 = 0x00,
Page1 = Ps0,
Page2 = Ps1,
};
enum { /* Isr/Imr */
Prx = 0x01, /* packet received */
Ptx = 0x02, /* packet transmitted */
Rxe = 0x04, /* receive error */
Txe = 0x08, /* transmit error */
Ovw = 0x10, /* overwrite warning */
Cnt = 0x20, /* counter overflow */
Rdc = 0x40, /* remote DMA complete */
Rst = 0x80, /* reset status */
};
enum { /* Dcr */
Wts = 0x01, /* word transfer select */
Bos = 0x02, /* byte order select */
Las = 0x04, /* long address select */
Ls = 0x08, /* loopback select */
Arm = 0x10, /* auto-initialise remote */
Ft0 = 0x20, /* FIFO threshold select */
Ft1 = 0x40,
Ft1WORD = 0x00,
Ft2WORD = Ft0,
Ft4WORD = Ft1,
Ft6WORD = Ft1|Ft0,
};
enum { /* Tcr */
Crc = 0x01, /* inhibit CRC */
Lb0 = 0x02, /* encoded loopback control */
Lb1 = 0x04,
LpbkNORMAL = 0x00, /* normal operation */
LpbkNIC = Lb0, /* internal NIC module loopback */
LpbkENDEC = Lb1, /* internal ENDEC module loopback */
LpbkEXTERNAL = Lb1|Lb0, /* external loopback */
Atd = 0x08, /* auto transmit disable */
Ofst = 0x10, /* collision offset enable */
};
enum { /* Tsr */
Ptxok = 0x01, /* packet transmitted */
Col = 0x04, /* transmit collided */
Abt = 0x08, /* tranmit aborted */
Crs = 0x10, /* carrier sense lost */
Fu = 0x20, /* FIFO underrun */
Cdh = 0x40, /* CD heartbeat */
Owc = 0x80, /* out of window collision */
};
enum { /* Rcr */
Sep = 0x01, /* save errored packets */
Ar = 0x02, /* accept runt packets */
Ab = 0x04, /* accept broadcast */
Am = 0x08, /* accept multicast */
Pro = 0x10, /* promiscuous physical */
Mon = 0x20, /* monitor mode */
};
enum { /* Rsr */
Prxok = 0x01, /* packet received intact */
Crce = 0x02, /* CRC error */
Fae = 0x04, /* frame alignment error */
Fo = 0x08, /* FIFO overrun */
Mpa = 0x10, /* missed packet */
Phy = 0x20, /* physical/multicast address */
Dis = 0x40, /* receiver disabled */
Dfr = 0x80, /* deferring */
};
typedef struct {
uchar status;
uchar next;
uchar len0;
uchar len1;
} Hdr;
void
dp8390getea(Ether* ether, uchar* ea)
{
Dp8390 *ctlr;
uchar cr;
int i;
ctlr = ether->ctlr;
/*
* Get the ethernet address from the chip.
* Take care to restore the command register
* afterwards.
*/
ilock(ctlr);
cr = regr(ctlr, Cr) & ~Txp;
regw(ctlr, Cr, Page1|(~(Ps1|Ps0) & cr));
for(i = 0; i < Eaddrlen; i++)
ea[i] = regr(ctlr, Par0+i);
regw(ctlr, Cr, cr);
iunlock(ctlr);
}
void
dp8390setea(Ether* ether)
{
int i;
uchar cr;
Dp8390 *ctlr;
ctlr = ether->ctlr;
/*
* Set the ethernet address into the chip.
* Take care to restore the command register
* afterwards. Don't care about multicast
* addresses as multicast is never enabled
* (currently).
*/
ilock(ctlr);
cr = regr(ctlr, Cr) & ~Txp;
regw(ctlr, Cr, Page1|(~(Ps1|Ps0) & cr));
for(i = 0; i < Eaddrlen; i++)
regw(ctlr, Par0+i, ether->ea[i]);
regw(ctlr, Cr, cr);
iunlock(ctlr);
}
static void*
_dp8390read(Dp8390* ctlr, void* to, ulong from, ulong len)
{
uchar cr;
int timo;
/*
* Read some data at offset 'from' in the card's memory
* using the DP8390 remote DMA facility, and place it at
* 'to' in main memory, via the I/O data port.
*/
cr = regr(ctlr, Cr) & ~Txp;
regw(ctlr, Cr, Page0|RdABORT|Sta);
regw(ctlr, Isr, Rdc);
/*
* Set up the remote DMA address and count.
*/
len = ROUNDUP(len, ctlr->width);
regw(ctlr, Rbcr0, len & 0xFF);
regw(ctlr, Rbcr1, (len>>8) & 0xFF);
regw(ctlr, Rsar0, from & 0xFF);
regw(ctlr, Rsar1, (from>>8) & 0xFF);
/*
* Start the remote DMA read and suck the data
* out of the I/O port.
*/
regw(ctlr, Cr, Page0|RdREAD|Sta);
rdread(ctlr, to, len);
/*
* Wait for the remote DMA to complete. The timeout
* is necessary because this routine may be called on
* a non-existent chip during initialisation and, due
* to the miracles of the bus, it's possible to get this
* far and still be talking to a slot full of nothing.
*/
for(timo = 10000; (regr(ctlr, Isr) & Rdc) == 0 && timo; timo--)
;
regw(ctlr, Isr, Rdc);
regw(ctlr, Cr, cr);
return to;
}
void*
dp8390read(Dp8390* ctlr, void* to, ulong from, ulong len)
{
void *v;
ilock(ctlr);
v = _dp8390read(ctlr, to, from, len);
iunlock(ctlr);
return v;
}
static void*
dp8390write(Dp8390* ctlr, ulong to, void* from, ulong len)
{
ulong crda;
uchar cr;
int timo, width;
top:
/*
* Write some data to offset 'to' in the card's memory
* using the DP8390 remote DMA facility, reading it at
* 'from' in main memory, via the I/O data port.
*/
cr = regr(ctlr, Cr) & ~Txp;
regw(ctlr, Cr, Page0|RdABORT|Sta);
regw(ctlr, Isr, Rdc);
len = ROUNDUP(len, ctlr->width);
/*
* Set up the remote DMA address and count.
* This is straight from the DP8390[12D] datasheet,
* hence the initial set up for read.
* Assumption here that the A7000 EtherV card will
* never need a dummyrr.
*/
if(ctlr->dummyrr && (ctlr->width == 1 || ctlr->width == 2)){
if(ctlr->width == 2)
width = 1;
else
width = 0;
crda = to-1-width;
regw(ctlr, Rbcr0, (len+1+width) & 0xFF);
regw(ctlr, Rbcr1, ((len+1+width)>>8) & 0xFF);
regw(ctlr, Rsar0, crda & 0xFF);
regw(ctlr, Rsar1, (crda>>8) & 0xFF);
regw(ctlr, Cr, Page0|RdREAD|Sta);
for(timo=0;; timo++){
if(timo > 10000){
print("ether8390: dummyrr timeout; assuming nodummyrr\n");
ctlr->dummyrr = 0;
goto top;
}
crda = regr(ctlr, Crda0);
crda |= regr(ctlr, Crda1)<<8;
if(crda == to){
/*
* Start the remote DMA write and make sure
* the registers are correct.
*/
regw(ctlr, Cr, Page0|RdWRITE|Sta);
crda = regr(ctlr, Crda0);
crda |= regr(ctlr, Crda1)<<8;
if(crda != to)
panic("crda write %d to %d\n", crda, to);
break;
}
}
}
else{
regw(ctlr, Rsar0, to & 0xFF);
regw(ctlr, Rsar1, (to>>8) & 0xFF);
regw(ctlr, Rbcr0, len & 0xFF);
regw(ctlr, Rbcr1, (len>>8) & 0xFF);
regw(ctlr, Cr, Page0|RdWRITE|Sta);
}
/*
* Pump the data into the I/O port
* then wait for the remote DMA to finish.
*/
rdwrite(ctlr, from, len);
for(timo = 10000; (regr(ctlr, Isr) & Rdc) == 0 && timo; timo--)
;
regw(ctlr, Isr, Rdc);
regw(ctlr, Cr, cr);
return (void*)to;
}
static void
ringinit(Dp8390* ctlr)
{
regw(ctlr, Pstart, ctlr->pstart);
regw(ctlr, Pstop, ctlr->pstop);
regw(ctlr, Bnry, ctlr->pstop-1);
regw(ctlr, Cr, Page1|RdABORT|Stp);
regw(ctlr, Curr, ctlr->pstart);
regw(ctlr, Cr, Page0|RdABORT|Stp);
ctlr->nxtpkt = ctlr->pstart;
}
static uchar
getcurr(Dp8390* ctlr)
{
uchar cr, curr;
cr = regr(ctlr, Cr) & ~Txp;
regw(ctlr, Cr, Page1|(~(Ps1|Ps0) & cr));
curr = regr(ctlr, Curr);
regw(ctlr, Cr, cr);
return curr;
}
static void
receive(Ether* ether)
{
Dp8390 *ctlr;
uchar curr, *p;
Hdr hdr;
ulong count, data, len;
RingBuf *ring;
ctlr = ether->ctlr;
for(curr = getcurr(ctlr); ctlr->nxtpkt != curr; curr = getcurr(ctlr)){
data = ctlr->nxtpkt*Dp8390BufSz;
if(ctlr->ram)
memmove(&hdr, (void*)(ether->mem+data), sizeof(Hdr));
else
_dp8390read(ctlr, &hdr, data, sizeof(Hdr));
/*
* Don't believe the upper byte count, work it
* out from the software next-page pointer and
* the current next-page pointer.
*/
if(hdr.next > ctlr->nxtpkt)
len = hdr.next - ctlr->nxtpkt - 1;
else
len = (ctlr->pstop-ctlr->nxtpkt) + (hdr.next-ctlr->pstart) - 1;
if(hdr.len0 > (Dp8390BufSz-sizeof(Hdr)))
len--;
len = ((len<<8)|hdr.len0)-4;
/*
* Chip is badly scrogged, reinitialise the ring.
*/
if(hdr.next < ctlr->pstart || hdr.next >= ctlr->pstop
|| len < 60 || len > sizeof(Etherpkt)){
print("dp8390: H#%2.2ux#%2.2ux#%2.2ux#%2.2ux,%lud\n",
hdr.status, hdr.next, hdr.len0, hdr.len1, len);
regw(ctlr, Cr, Page0|RdABORT|Stp);
ringinit(ctlr);
regw(ctlr, Cr, Page0|RdABORT|Sta);
return;
}
/*
* If it's a good packet read it in to the software buffer.
* If the packet wraps round the hardware ring, read it in
* two pieces.
*/
ring = ðer->rb[ether->ri];
if((hdr.status & (Fo|Fae|Crce|Prxok)) == Prxok && ring->owner == Interface){
p = ring->pkt;
ring->len = len;
data += sizeof(Hdr);
if((data+len) >= ctlr->pstop*Dp8390BufSz){
count = ctlr->pstop*Dp8390BufSz - data;
if(ctlr->ram)
memmove(p, (void*)(ether->mem+data), count);
else
_dp8390read(ctlr, p, data, count);
p += count;
data = ctlr->pstart*Dp8390BufSz;
len -= count;
}
if(len){
if(ctlr->ram)
memmove(p, (void*)(ether->mem+data), len);
else
_dp8390read(ctlr, p, data, len);
}
/*
* Copy the packet to whoever wants it.
*/
ring->owner = Host;
ether->ri = NEXT(ether->ri, ether->nrb);
}
/*
* Finished with this packet, update the
* hardware and software ring pointers.
*/
ctlr->nxtpkt = hdr.next;
hdr.next--;
if(hdr.next < ctlr->pstart)
hdr.next = ctlr->pstop-1;
regw(ctlr, Bnry, hdr.next);
}
}
static void
txstart(Ether* ether)
{
int len;
Dp8390 *ctlr;
RingBuf *ring;
uchar minpkt[ETHERMINTU], *rp;
ctlr = ether->ctlr;
/*
* This routine is called both from the top level and from interrupt
* level and expects to be called with ctlr already locked.
*/
if(ether->tbusy)
return;
ring = ðer->tb[ether->ti];
if(ring->owner != Interface)
return;
/*
* Make sure the packet is of minimum length;
* copy it to the card's memory by the appropriate means;
* start the transmission.
*/
len = ring->len;
rp = ring->pkt;
if(len < ETHERMINTU){
rp = minpkt;
memmove(rp, ring->pkt, len);
memset(rp+len, 0, ETHERMINTU-len);
len = ETHERMINTU;
}
if(ctlr->ram)
memmove((void*)(ether->mem+ctlr->tstart*Dp8390BufSz), rp, len);
else
dp8390write(ctlr, ctlr->tstart*Dp8390BufSz, rp, len);
regw(ctlr, Tbcr0, len & 0xFF);
regw(ctlr, Tbcr1, (len>>8) & 0xFF);
regw(ctlr, Cr, Page0|RdABORT|Txp|Sta);
ether->tbusy = 1;
}
static void
transmit(Ether* ether)
{
Dp8390 *ctlr;
ctlr = ether->ctlr;
ilock(ctlr);
txstart(ether);
iunlock(ctlr);
}
static void
overflow(Ether *ether)
{
Dp8390 *ctlr;
uchar txp;
int resend;
ctlr = ether->ctlr;
/*
* The following procedure is taken from the DP8390[12D] datasheet,
* it seems pretty adamant that this is what has to be done.
*/
txp = regr(ctlr, Cr) & Txp;
regw(ctlr, Cr, Page0|RdABORT|Stp);
delay(2);
regw(ctlr, Rbcr0, 0);
regw(ctlr, Rbcr1, 0);
resend = 0;
if(txp && (regr(ctlr, Isr) & (Txe|Ptx)) == 0)
resend = 1;
regw(ctlr, Tcr, LpbkNIC);
regw(ctlr, Cr, Page0|RdABORT|Sta);
receive(ether);
regw(ctlr, Isr, Ovw);
regw(ctlr, Tcr, LpbkNORMAL);
if(resend)
regw(ctlr, Cr, Page0|RdABORT|Txp|Sta);
}
static void
interrupt(Ureg*, void* arg)
{
Ether *ether;
Dp8390 *ctlr;
RingBuf *ring;
uchar isr, r;
ether = arg;
ctlr = ether->ctlr;
/*
* While there is something of interest,
* clear all the interrupts and process.
*/
ilock(ctlr);
regw(ctlr, Imr, 0x00);
while(isr = (regr(ctlr, Isr) & (Cnt|Ovw|Txe|Rxe|Ptx|Prx))){
if(isr & Ovw){
overflow(ether);
regw(ctlr, Isr, Ovw);
}
/*
* Packets have been received.
* Take a spin round the ring.
*/
if(isr & (Rxe|Prx)){
receive(ether);
regw(ctlr, Isr, Rxe|Prx);
}
/*
* A packet completed transmission, successfully or
* not. Start transmission on the next buffered packet,
* and wake the output routine.
*/
if(isr & (Txe|Ptx)){
r = regr(ctlr, Tsr);
if((isr & Txe) && (r & (Cdh|Fu|Crs|Abt))){
print("dp8390: Tsr#%2.2ux|", r);
}
regw(ctlr, Isr, Txe|Ptx);
ring = ðer->tb[ether->ti];
ring->owner = Host;
ether->ti = NEXT(ether->ti, ether->ntb);
ether->tbusy = 0;
txstart(ether);
}
if(isr & Cnt){
regr(ctlr, Cntr0);
regr(ctlr, Cntr1);
regr(ctlr, Cntr2);
regw(ctlr, Isr, Cnt);
}
}
regw(ctlr, Imr, Cnt|Ovw|Txe|Rxe|Ptx|Prx);
iunlock(ctlr);
}
static void
attach(Ether* ether)
{
Dp8390 *ctlr;
uchar r;
ctlr = ether->ctlr;
/*
* Enable the chip for transmit/receive.
* The init routine leaves the chip in monitor
* mode. Clear the missed-packet counter, it
* increments while in monitor mode.
* Sometimes there's an interrupt pending at this
* point but there's nothing in the Isr, so
* any pending interrupts are cleared and the
* mask of acceptable interrupts is enabled here.
*/
r = Ab;
ilock(ctlr);
regw(ctlr, Isr, 0xFF);
regw(ctlr, Imr, Cnt|Ovw|Txe|Rxe|Ptx|Prx);
regw(ctlr, Rcr, r);
r = regr(ctlr, Cntr2);
regw(ctlr, Tcr, LpbkNORMAL);
iunlock(ctlr);
USED(r);
}
static void
detach(Ether* ether)
{
int timo;
Dp8390 *ctlr;
/*
* Stop the chip. Set the Stp bit and wait for the chip
* to finish whatever was on its tiny mind before it sets
* the Rst bit.
* The timeout is needed because there may not be a real
* chip there if this is called when probing for a device
* at boot.
*/
ctlr = ether->ctlr;
regw(ctlr, Cr, Page0|RdABORT|Stp);
regw(ctlr, Rbcr0, 0);
regw(ctlr, Rbcr1, 0);
for(timo = 10000; (regr(ctlr, Isr) & Rst) == 0 && timo; timo--)
;
}
int
dp8390reset(Ether* ether)
{
Dp8390 *ctlr;
ctlr = ether->ctlr;
/*
* This is the initialisation procedure described
* as 'mandatory' in the datasheet, with references
* to the 3C503 technical reference manual.
*/
detach(ether);
if(ctlr->width != 1)
regw(ctlr, Dcr, Ft4WORD|Ls|Wts);
else
regw(ctlr, Dcr, Ft4WORD|Ls);
regw(ctlr, Rbcr0, 0);
regw(ctlr, Rbcr1, 0);
regw(ctlr, Tcr, LpbkNIC);
regw(ctlr, Rcr, Mon);
/*
* Init the ring hardware and software ring pointers.
* Can't initialise ethernet address as it may not be
* known yet.
*/
ringinit(ctlr);
regw(ctlr, Tpsr, ctlr->tstart);
/*
* Clear any pending interrupts and mask then all off.
*/
regw(ctlr, Isr, 0xFF);
regw(ctlr, Imr, 0);
/*
* Leave the chip initialised,
* but in monitor mode.
*/
regw(ctlr, Cr, Page0|RdABORT|Sta);
/*
* Set up the software configuration.
*/
ether->attach = attach;
ether->transmit = transmit;
ether->interrupt = interrupt;
ether->detach = detach;
return 0;
}