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ether82563: make link status work for 82567

on the 82567, reading any phy register just gives 0 back.
however, the card works just fine and no action is required
to (re-)start auto negotiation. so we add maclproc() which just
reads the speed setting and link status from the mac status
register instead of reading the phy registers.

we'v probably seen this symptom on other cards (link: 0) like
82566. we should test if we can make link status work on
these cards as well by just using the maclproc().

--- a/sys/src/9/pc/ether82563.c

+++ b/sys/src/9/pc/ether82563.c

@@ -1281,6 +1281,31 @@

 }

 static void

+maclproc(void *v)

+{

+	uint i;

+	Ctlr *c;

+	Ether *e;

+

+	e = v;

+	c = e->ctlr;

+

+	for(;;){

+		i = csr32r(c, Status);

+		e->link = (i & Lu) != 0;

+		i = (i >> 6) & 3;	/* link speed 6:7 */

+		if(e->link == 0)

+			i = 3;

+		c->speeds[i]++;

+		e->mbps = speedtab[i];

+		c->lim = 0;

+		i82563im(c, Lsc);

+		c->lsleep++;

+		sleep(&c->lrendez, i82563lim, c);

+	}

+}

+

+static void

 i82563attach(Ether *edev)

 {

 	char name[KNAMELEN];

@@ -1329,6 +1354,8 @@

 		kproc(name, pcslproc, edev);		/* phy based serdes */

 	else if(cttab[ctlr->type].flag & F79phy)

 		kproc(name, phyl79proc, edev);

+	else if(ctlr->type == i82567)

+		kproc(name, maclproc, edev);		/* use mac link status */

 	else

 		kproc(name, phylproc, edev);

-- 

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