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ether8169: support for RTL8168EP chips

There are a few flags we need to set, and the order
of initialization changed. Synced from the FreeBSD
driver, with the mac version coming from Linux.

--- a/sys/src/9/pc/ether8169.c

+++ b/sys/src/9/pc/ether8169.c

@@ -126,6 +126,7 @@

 	Macv42		= 0x50800000,	/* RTL8168GU */

 	Macv44		= 0x5c800000,	/* RTL8411B */

 	Macv45		= 0x54000000,	/* RTL8111HN */

+	Macv51		= 0x50000000,	/* RTL8168EP */

 	Ifg0		= 0x01000000,	/* Interframe Gap 0 */

 	Ifg1		= 0x02000000,	/* Interframe Gap 1 */

@@ -714,6 +715,7 @@

 	switch(ctlr->macv){

 	case Macv40:

 	case Macv44:

+	case Macv51:

 		cplusc |= Macstatdis;

 		break;

 	default:

@@ -737,6 +739,7 @@

 	switch(ctlr->macv){

 	case Macv42:

 	case Macv45:

+	case Macv51:

 		ctlr->rcr = Rxfth256|Mrxdmaunlimited|Ab|Am|Apm;

 		break;

 	default:

@@ -758,6 +761,9 @@

 	r = csr16r(ctlr, Mulint) & 0xF000;

 	csr16w(ctlr, Mulint, r);

+	if(ctlr->macv == Macv51)

+		csr8w(ctlr, Cr, Te|Re);

+

 	ctlr->imr = Serr|Fovw|Punlc|Rdu|Ter|Rer|Rok|Tdu;

 	csr16w(ctlr, Imr, ctlr->imr);

@@ -1096,6 +1102,7 @@

 	case Macv42:

 	case Macv44:

 	case Macv45:

+	case Macv51:

 		break;

 	}

 	return 0;