* SMSC 9221 Ethernet driver

/*
* SMSC 9221 Ethernet driver
* specifically for the ISEE IGEPv2 board,
* where it is assigned to Chip Select 5,
* its registers are at 0x2c000000 (inherited from u-boot),
* and irq is 34 from gpio pin 176, thus gpio module 6.
*
* it's slow due to the use of fifos instead of buffer rings.
* the slow system dma just makes it worse.
*
* igepv2 u-boot uses pin 64 on gpio 3 as an output pin to reset the 9221.
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
#include "../port/netif.h"
#include "../port/etherif.h"

/* currently using kprocs is a lot slower than not (87 s. to boot vs 60) */
#undef USE_KPROCS

enum {
Vid9221 = 0x9221,
Slop = 4, /* beyond ETHERMAXTU */
};

typedef struct Regs Regs;
struct Regs {
/* fifo ports */
ulong rxdata;
uchar _pad0[0x20 - 4];
ulong txdata;
uchar _pad1[0x40 - 0x24];
ulong rxsts;
ulong rxstspeek;
ulong txsts;
ulong txstspeek;

/* control & status */
ushort rev; /* chip revision */
ushort id; /* chip id, 0x9221 */
ulong irqcfg;
ulong intsts;
ulong inten;
ulong _pad2;
ulong bytetest;
ulong fifoint; /* fifo level interrupts */
ulong rxcfg;
ulong txcfg;
ulong hwcfg;
ulong rxdpctl; /* rx data path control */
ulong rxfifoinf;
ulong txfifoinf;
ulong pmtctl; /* power mgmt. control */
ulong gpiocfg;
ulong gptcfg; /* timer */
ulong gptcnt;
ulong _pad3;
ulong wordswap;
ulong freerun; /* counters */
ulong rxdrop;

/*
* mac registers are accessed indirectly via the mac csr registers.
* phy registers are doubly indirect, via the mac csr mii_acc &
* mii_data mac csr registers.
*/
ulong maccsrcmd; /* mac csr synchronizer */
ulong maccsrdata;
ulong afccfg; /* automatic flow control cfg. */
ulong eepcmd; /* eeprom */
ulong eepdata;
/* 0xb8 */
};

enum {
Nstatistics = 128,
};

enum {
/* txcmda bits */
Intcompl = 1<<31,
Bufendalign = 3<<24, /* mask */
Datastoff = 037<<16, /* mask */
Firstseg = 1<<13,
Lastseg = 1<<12,
Bufsize = MASK(11),

/* txcmdb bits */
Pkttag = MASK(16) << 16,
Txcksumen = 1<<14,
Addcrcdis = 1<<13,
Framepaddis = 1<<12,
Pktlen = (1<<1) - 1, /* mask */

/* txcfg bits */
Txsdump = 1<<15, /* flush tx status fifo */
Txddump = 1<<14, /* flush tx data fifo */
Txon = 1<<1,
Stoptx = 1<<0,

/* hwcfg bits */
Mbo = 1<<20, /* must be one */
Srstto = 1<<1, /* soft reset time-out */
Srst = 1<<0,

/* rxcfg bits */
Rxdmacntshift = 16, /* ulong count, 12 bits wide */
Rxdmacntmask = MASK(12) << Rxdmacntshift,
Rxdump = 1<<15, /* flush rx fifos */

/* rxsts bits */
Rxpktlenshift = 16, /* byte count */
Rxpktlenmask = MASK(14) << Rxpktlenshift,
Rxerr = 1<<15,

/* rxfifoinf bits */
Rxstsusedshift = 16, /* ulong count */
Rxstsusedmask = MASK(8) << Rxstsusedshift,
Rxdatausedmask = MASK(16), /* byte count */

/* txfifoinf bits */
Txstsusedshift = 16, /* ulong count */
Txstsusedmask = MASK(8) << Txstsusedshift,
Txdatafreemask = MASK(16), /* byte count */

/* pmtctl bits */
Dready = 1<<0,

/* maccsrcmd bits */
Csrbusy = 1<<31,
Csrread = 1<<30, /* not write */
Csraddrshift = 0,
Csraddrmask = MASK(8) - 1,

/* mac registers' indices */
Maccr = 1,
Macaddrh,
Macaddrl,
Machashh,
Machashl,
Macmiiacc, /* for doubly-indirect phy access */
Macmiidata,
Macflow,
Macvlan1,
Macvlan2,
Macwuff,
Macwucsr,
Maccoe,

/* Maccr bits */
Rxall = 1<<31,
Rcvown = 1<<23, /* don't receive own transmissions */
Fdpx = 1<<20, /* full duplex */
Mcpas = 1<<19, /* pass all multicast */
Prms = 1<<18, /* promiscuous */
Ho = 1<<15, /* hash-only filtering */
Hpfilt = 1<<13, /* hash/perfect filtering */
Padstr = 1<<8, /* strip padding & fcs (crc) */
Txen = 1<<3,
Rxen = 1<<2,

/* irqcfg bits */
Irqdeasclr = 1<<14, /* deassertion intv'l clear */
Irqdeassts = 1<<13, /* deassertion intv'l status */
Irqint = 1<<12, /* intr being asserted? (ro) */
Irqen = 1<<8,
Irqpol = 1<<4, /* irq output is active high */
Irqpushpull = 1<<0, /* irq output is push/pull driver */

/* intsts/inten bits */
Swint = 1<<31, /* generate an interrupt */
Txstop = 1<<25,
Rxstop = 1<<24,
Txioc = 1<<21,
Rxdma = 1<<20,
Gptimer = 1<<19,
Phy = 1<<18,
Rxe = 1<<14, /* errors */
Txe = 1<<13,
Tdfo = 1<<10, /* tx data fifo overrun */
Tdfa = 1<<9, /* tx data fifo available */
Tsff = 1<<8, /* tx status fifo full */
Tsfl = 1<<7, /* tx status fifo level */
Rsff = 1<<4, /* rx status fifo full */
Rsfl = 1<<3, /* rx status fifo level */

/* eepcmd bits */
Epcbusy = 1<<31,
Epccmdshift = 28, /* interesting one is Reload (7) */
Epctimeout = 1<<9,
Epcmacloaded = 1<<8,
Epcaddrshift = 0,
};

enum {
Rxintrs = Rsff | Rsfl | Rxe,
Txintrs = Tsff | Tsfl | Txe | Txioc,
};

/* wake-up frame filter */
struct Wakeup {
ulong bytemask[4]; /* index is filter # */
uchar filt0cmd; /* filter 0 command */
uchar _pad0;
uchar filt1cmd;
uchar _pad1;
uchar filt2cmd;
uchar _pad2;
uchar filt3cmd;
uchar _pad3;
uchar offset[4]; /* index is filter # */
ushort crc16[4]; /* " */
};

typedef struct Ctlr Ctlr;
struct Ctlr {
int port;
Ctlr* next;
Ether* edev;
Regs* regs;
int active;
int started;
int inited;
int id;
int cls;
ushort eeprom[0x40];

QLock alock; /* attach */
int nrb; /* how many this Ctlr has in the pool */

int* nic;
Lock imlock;
int im; /* interrupt mask */

// Mii* mii;
// Rendez lrendez;
int lim;

int link;

QLock slock;
uint statistics[Nstatistics];
uint lsleep;
uint lintr;
uint rsleep;
uint rintr;
int tsleep;
uint tintr;

uchar ra[Eaddrlen]; /* receive address */
ulong mta[128]; /* multicast table array */

Rendez rrendez;
int gotinput;
int rdcpydone;

Rendez trendez;
int gotoutput;
int wrcpydone;

Lock tlock;
};

#define csr32r(c, r) (*((c)->nic+((r)/4)))
#define csr32w(c, r, v) (*((c)->nic+((r)/4)) = (v))

static Ctlr *smcctlrhead, *smcctlrtail;

static char* statistics[Nstatistics] = { "dummy", };

static uchar mymac[] = { 0xb0, 0x0f, 0xba, 0xbe, 0x00, 0x00, };

static void etherclock(void);
static void smcreceive(Ether *edev);
static void smcinterrupt(Ureg*, void* arg);

static Ether *thisether;
static int attached;

static void
smconce(Ether *edev)
{
static int beenhere;
static Lock l;

ilock(&l);
if (!beenhere && edev != nil) {
beenhere = 1;
/* simulate interrupts if we don't know the irq */
if (edev->irq < 0) { /* poll as backup */
thisether = edev;
addclock0link(etherclock, 1000/HZ);
iprint(" polling");
}
}
iunlock(&l);
}

/*
* indirect (mac) register access
*/

static void
macwait(Regs *regs)
{
long bound;

for (bound = 400*Mhz; regs->maccsrcmd & Csrbusy && bound > 0; bound--)
;
if (bound <= 0)
iprint("smc: mac registers didn't come ready\n");
}

static ulong
macrd(Regs *regs, uchar index)
{
macwait(regs);
regs->maccsrcmd = Csrbusy | Csrread | index;
coherence(); /* back-to-back write/read delay per §6.2.1 */
macwait(regs);
return regs->maccsrdata;
}

static void
macwr(Regs *regs, uchar index, ulong val)
{
macwait(regs);
regs->maccsrdata = val;
regs->maccsrcmd = Csrbusy | index; /* fire */
macwait(regs);
}

static long
smcifstat(Ether* edev, void* a, long n, ulong offset)
{
Ctlr *ctlr;
char *p, *s;
int i, l, r;

ctlr = edev->ctlr;
qlock(&ctlr->slock);
p = malloc(READSTR);
l = 0;
for(i = 0; i < Nstatistics; i++){
// read regs->rxdrop TODO
r = 0;
if((s = statistics[i]) == nil)
continue;
switch(i){
default:
ctlr->statistics[i] += r;
if(ctlr->statistics[i] == 0)
continue;
l += snprint(p+l, READSTR-l, "%s: %ud %ud\n",
s, ctlr->statistics[i], r);
break;
}
}

l += snprint(p+l, READSTR-l, "lintr: %ud %ud\n",
ctlr->lintr, ctlr->lsleep);
l += snprint(p+l, READSTR-l, "rintr: %ud %ud\n",
ctlr->rintr, ctlr->rsleep);
l += snprint(p+l, READSTR-l, "tintr: %ud %ud\n",
ctlr->tintr, ctlr->tsleep);

l += snprint(p+l, READSTR-l, "eeprom:");
for(i = 0; i < 0x40; i++){
if(i && ((i & 0x07) == 0))
l += snprint(p+l, READSTR-l, "\n ");
l += snprint(p+l, READSTR-l, " %4.4uX", ctlr->eeprom[i]);
}
l += snprint(p+l, READSTR-l, "\n");
USED(l);

n = readstr(offset, a, n, p);
free(p);
qunlock(&ctlr->slock);

return n;
}

static void
smcpromiscuous(void* arg, int on)
{
int rctl;
Ctlr *ctlr;
Ether *edev;
Regs *regs;

edev = arg;
ctlr = edev->ctlr;
regs = ctlr->regs;
rctl = macrd(regs, Maccr);
if(on)
rctl |= Prms;
else
rctl &= ~Prms;
macwr(regs, Maccr, rctl);
}

static void
smcmulticast(void*, uchar*, int)
{
/* nothing to do, we allow all multicast packets in */
}

static int
iswrcpydone(void *arg)
{
return ((Ctlr *)arg)->wrcpydone;
}

static int
smctxstart(Ctlr *ctlr, uchar *ubuf, uint len)
{
uint wds, ruplen;
ulong *wdp, *txdp;
Regs *regs;
static ulong buf[ROUNDUP(ETHERMAXTU, sizeof(ulong)) / sizeof(ulong)];

if (!ctlr->inited) {
iprint("smctxstart: too soon to send\n");
return -1; /* toss it */
}
regs = ctlr->regs;

/* is there room for a packet in the tx data fifo? */
if (len < ETHERMINTU)
iprint("sending too-short (%d) pkt\n", len);
else if (len > ETHERMAXTU)
iprint("sending jumbo (%d) pkt\n", len);

ruplen = ROUNDUP(len, sizeof(ulong));
coherence(); /* back-to-back read/read delay per §6.2.2 */
if ((regs->txfifoinf & Txdatafreemask) < ruplen + 2*sizeof(ulong))
return -1; /* not enough room for data + command words */

if ((uintptr)ubuf & MASK(2)) { /* ensure word alignment */
memmove(buf, ubuf, len);
ubuf = (uchar *)buf;
}

/* tx cmd a: length is bytes in this buffer */
txdp = &regs->txdata;
*txdp = Intcompl | Firstseg | Lastseg | len;
/* tx cmd b: length is bytes in this packet (could be multiple buf.s) */
*txdp = len;

/* shovel pkt into tx fifo, which triggers transmission due to Txon */
wdp = (ulong *)ubuf;
for (wds = ruplen / sizeof(ulong) + 1; --wds > 0; )
*txdp = *wdp++;

regs->intsts = Txintrs; /* dismiss intr */
coherence();
regs->inten |= Txintrs;
coherence(); /* back-to-back write/read delay per §6.2.1 */
return 0;
}

static void
smctransmit(Ether* edev)
{
Block *bp;
Ctlr *ctlr;

ctlr = edev->ctlr;
if (ctlr == nil)
panic("smctransmit: nil ctlr");
ilock(&ctlr->tlock);
/*
* Try to fill the chip's buffers back up, via the tx fifo.
*/
while ((bp = qget(edev->oq)) != nil)
if (smctxstart(ctlr, bp->rp, BLEN(bp)) < 0) {
qputback(edev->oq, bp); /* retry the block later */
iprint("smctransmit: tx data fifo full\n");
break;
} else
freeb(bp);
iunlock(&ctlr->tlock);
}

static void
smctransmitcall(Ether *edev) /* called from devether.c */
{
Ctlr *ctlr;

ctlr = edev->ctlr;
ctlr->gotoutput = 1;
#ifdef USE_KPROCS
wakeup(&ctlr->trendez);
#else
smctransmit(edev);
#endif
}

static int
smcrim(void* ctlr)
{
return ((Ctlr*)ctlr)->gotinput;
}

static void
smcrproc(void* arg)
{
Ctlr *ctlr;
Ether *edev;

edev = arg;
ctlr = edev->ctlr;
for(;;){
ctlr->rsleep++;
sleep(&ctlr->rrendez, smcrim, ctlr);

/* process any newly-arrived packets and pass to etheriq */
ctlr->gotinput = 0;
smcreceive(edev);
}
}

static int
smcgotout(void* ctlr)
{
return ((Ctlr*)ctlr)->gotoutput;
}

static void
smctproc(void* arg)
{
Ctlr *ctlr;
Ether *edev;

edev = arg;
ctlr = edev->ctlr;
for(;;){
ctlr->tsleep++;
sleep(&ctlr->trendez, smcgotout, ctlr);

/* process any newly-arrived packets and pass to etheriq */
ctlr->gotoutput = 0;
smctransmit(edev);
}
}

void gpioirqclr(void);

static void
smcattach(Ether* edev)
{
#ifdef USE_KPROCS
char name[KNAMELEN];
#endif
Ctlr *ctlr;

ctlr = edev->ctlr;
qlock(&ctlr->alock);
if(waserror()){
qunlock(&ctlr->alock);
nexterror();
}
if (!ctlr->inited) {
ctlr->inited = 1;
#ifdef USE_KPROCS
snprint(name, KNAMELEN, "#l%drproc", edev->ctlrno);
kproc(name, smcrproc, edev);

snprint(name, KNAMELEN, "#l%dtproc", edev->ctlrno);
kproc(name, smctproc, edev);
#endif

iprint("smcattach:");
#ifdef USE_KPROCS
iprint(" with kprocs");
#else
iprint(" no kprocs");
#endif
iprint(", no dma");
/* can now accept real or simulated interrupts */

smconce(edev);
attached = 1;
iprint("\n");
}
qunlock(&ctlr->alock);
poperror();
}

static int
isrdcpydone(void *arg)
{
return ((Ctlr *)arg)->rdcpydone;
}

static void
smcreceive(Ether *edev)
{
uint wds, len, sts;
ulong *wdp, *rxdp;
Block *bp;
Ctlr *ctlr;
Regs *regs;

ctlr = edev->ctlr;
regs = ctlr->regs;
coherence(); /* back-to-back read/read delay per §6.2.2 */
/*
* is there a full packet in the rx data fifo?
*/
while (((regs->rxfifoinf & Rxstsusedmask) >> Rxstsusedshift) != 0) {
coherence();
sts = regs->rxsts; /* pop rx status */
if(sts & Rxerr)
iprint("smcreceive: rx error\n");
len = (sts & Rxpktlenmask) >> Rxpktlenshift;
if (len > ETHERMAXTU + Slop)
iprint("smcreceive: oversized rx pkt (%d)\n", len);
else if (len < ETHERMINTU)
iprint("smcreceive: too-short (%d) pkt\n", len);
wds = ROUNDUP(len, sizeof(ulong)) / sizeof(ulong);
if (wds > 0) {
/* copy aligned words from rx fifo into a Block */
bp = iallocb(len + sizeof(ulong) /* - 1 */);
if (bp == nil)
panic("smcreceive: nil Block*");

/* bp->rp should be 32-byte aligned, more than we need */
assert(((uintptr)bp->rp & (sizeof(ulong) - 1)) == 0);
wdp = (ulong *)bp->rp;
rxdp = &regs->rxdata;
wds = ROUNDUP(len, sizeof(ulong)) / sizeof(ulong) + 1;
while (--wds > 0)
*wdp++ = *rxdp;
bp->wp = bp->rp + len;

/* and push the Block upstream */
if (ctlr->inited)
etheriq(edev, bp);
else
freeb(bp);

regs->intsts = Rxintrs; /* dismiss intr */
coherence();
regs->inten |= Rxintrs;
}
coherence();
}
regs->inten |= Rxintrs;
coherence();
}

/*
* disable the stsclr bits in inten and write them to intsts to ack and dismiss
* the interrupt source.
*/
void
ackintr(Regs *regs, ulong stsclr)
{
if (stsclr == 0)
return;

regs->inten &= ~stsclr;
coherence();

// regs->intsts = stsclr; /* acknowledge & clear intr(s) */
// coherence();
}

static void
smcinterrupt(Ureg*, void* arg)
{
int junk;
unsigned intsts, intr;
Ctlr *ctlr;
Ether *edev;
Regs *regs;

edev = arg;
ctlr = edev->ctlr;
ilock(&ctlr->imlock);
regs = ctlr->regs;

gpioirqclr();

coherence(); /* back-to-back read/read delay per §6.2.2 */
intsts = regs->intsts;
coherence();

intsts &= ~MASK(3); /* ignore gpio bits */
if (0 && intsts == 0) {
coherence();
iprint("smc: interrupt without a cause; insts %#ux (vs inten %#lux)\n",
intsts, regs->inten);
}

intr = intsts & Rxintrs;
if(intr) {
/* disable interrupt sources; kproc/smcreceive will reenable */
ackintr(regs, intr);

ctlr->rintr++;
ctlr->gotinput = 1;
#ifdef USE_KPROCS
wakeup(&ctlr->rrendez);
#else
smcreceive(edev);
#endif
}

while(((regs->txfifoinf & Txstsusedmask) >> Txstsusedshift) != 0) {
/* probably indicates tx completion, just toss it */
junk = regs->txsts; /* pop tx sts */
USED(junk);
coherence();
}

intr = intsts & Txintrs;
if (ctlr->gotoutput || intr) {
/* disable interrupt sources; kproc/smctransmit will reenable */
ackintr(regs, intr);

ctlr->tintr++;
ctlr->gotoutput = 1;
#ifdef USE_KPROCS
wakeup(&ctlr->trendez);
#else
smctransmit(edev);
#endif
}

iunlock(&ctlr->imlock);
}

static void
etherclock(void)
{
smcinterrupt(nil, thisether);
}

static int
smcmii(Ctlr *)
{
return 0;
}

static int
smcdetach(Ctlr* ctlr)
{
Regs *regs;

if (ctlr == nil || ctlr->regs == nil)
return -1;
regs = ctlr->regs;
/* verify that it's real by reading a few registers */
switch (regs->id) {
case Vid9221:
break;
default:
print("smc: unknown chip id %#ux\n", regs->id);
return -1;
}
regs->inten = 0; /* no interrupts */
regs->intsts = ~0; /* clear any pending */
regs->gptcfg = 0;
coherence();
regs->rxcfg = Rxdump;
regs->txcfg = Txsdump | Txddump;
regs->irqcfg &= ~Irqen;
coherence();
return 0;
}

static void
smcshutdown(Ether* ether)
{
smcdetach(ether->ctlr);
}

static void
powerwait(Regs *regs)
{
long bound;

regs->bytetest = 0; /* bring power on */
for (bound = 400*Mhz; !(regs->pmtctl & Dready) && bound > 0; bound--)
;
if (bound <= 0)
iprint("smc: pmtctl didn't come ready\n");
}

static int
smcreset(Ctlr* ctlr)
{
int r;
Regs *regs;
static char zea[Eaddrlen];

regs = ctlr->regs;
powerwait(regs);

if(smcdetach(ctlr))
return -1;

/* verify that it's real by reading a few registers */
switch (regs->id) {
case Vid9221:
break;
default:
print("smc: unknown chip id %#ux\n", regs->id);
return -1;
}
if (regs->bytetest != 0x87654321) {
print("smc: bytetest reg %#p (%#lux) != 0x87654321\n",
&regs->bytetest, regs->bytetest);
return -1;
}

#ifdef TODO /* read MAC from EEPROM */
// int ctrl, i, pause, swdpio, txcw;
/*
* Snarf and set up the receive addresses.
* There are 16 addresses. The first should be the MAC address.
* The others are cleared and not marked valid (MS bit of Rah).
*/
for(i = Ea; i < Eaddrlen/2; i++){
ctlr->ra[2*i] = ctlr->eeprom[i];
ctlr->ra[2*i+1] = ctlr->eeprom[i]>>8;
}

/*
* Clear the Multicast Table Array.
* It's a 4096 bit vector accessed as 128 32-bit registers.
*/
memset(ctlr->mta, 0, sizeof(ctlr->mta));
for(i = 0; i < 128; i++)
csr32w(ctlr, Mta+i*4, 0);
#endif
regs->hwcfg |= Mbo;

/* don't overwrite existing ea */
// if (memcmp(edev->ea, zea, Eaddrlen) == 0)
// memmove(edev->ea, ctlr->ra, Eaddrlen);

r = ctlr->ra[3]<<24 | ctlr->ra[2]<<16 | ctlr->ra[1]<<8 | ctlr->ra[0];
macwr(regs, Macaddrl, r);
macwr(regs, Macaddrh, ctlr->ra[5]<<8 | ctlr->ra[4]);

/* turn on the controller */
macwr(regs, Maccoe, 0);
regs->inten = 0; /* no interrupts yet */
regs->intsts = ~0; /* clear any pending */
regs->gptcfg = 0;
coherence();
regs->rxcfg = Rxdump;
regs->txcfg = Txsdump | Txddump | Txon;
regs->fifoint = 72<<24; /* default values */
macwr(regs, Maccr, Rxall | Rcvown | Fdpx | Mcpas | Txen | Rxen);
coherence(); /* back-to-back write/read delay per §6.2.1 */
regs->irqcfg = 1<<24 | Irqen | Irqpushpull; /* deas for 10µs (linux) */
coherence(); /* back-to-back write/read delay per §6.2.1 */
regs->inten = Rxintrs | Txintrs;
coherence();

if(smcmii(ctlr) < 0)
return -1;
return 0;
}

static void
smcpci(void)
{
Ctlr *ctlr;
static int beenhere;

if (beenhere)
return;
beenhere = 1;

if (probeaddr(PHYSETHER) < 0)
return;
ctlr = malloc(sizeof(Ctlr));
ctlr->id = Vid9221<<16 | 0x0424; /* smsc 9221 */
ctlr->port = PHYSETHER;
ctlr->nic = (int *)PHYSETHER;
ctlr->regs = (Regs *)PHYSETHER;

if(smcreset(ctlr)){
free(ctlr);
return;
}
if(smcctlrhead != nil)
smcctlrtail->next = ctlr;
else
smcctlrhead = ctlr;
smcctlrtail = ctlr;
}

static int
smcpnp(Ether* edev)
{
Ctlr *ctlr;
static char zea[Eaddrlen];

if(smcctlrhead == nil)
smcpci();

/*
* Any adapter matches if no edev->port is supplied,
* otherwise the ports must match.
*/
for(ctlr = smcctlrhead; ctlr != nil; ctlr = ctlr->next){
if(ctlr->active)
continue;
if(edev->port == 0 || edev->port == ctlr->port){
ctlr->active = 1;
break;
}
}
if(ctlr == nil)
return -1;

edev->ctlr = ctlr;
ctlr->edev = edev; /* point back to Ether* */
edev->port = ctlr->port;
edev->irq = 34;
// TODO: verify speed (100Mb/s) and duplicity (full-duplex)
edev->mbps = 100;

/* don't overwrite existing ea */
if (memcmp(edev->ea, zea, Eaddrlen) == 0)
memmove(edev->ea, ctlr->ra, Eaddrlen);

/*
* Linkage to the generic ethernet driver.
*/
edev->attach = smcattach;
edev->transmit = smctransmitcall;
edev->ifstat = smcifstat;
/* edev->ctl = smcctl; /* no ctl msgs supported */

edev->arg = edev;
edev->promiscuous = smcpromiscuous;
edev->multicast = smcmulticast;
edev->shutdown = smcshutdown;

intrenable(edev->irq, smcinterrupt, edev, 0, edev->name);

return 0;
}

void
ether9221link(void)
{
addethercard("9221", smcpnp);
}