From 945d71338cd4332fbbd846f9f9256d7eb9939ff7 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Sun, 4 Jun 2000 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 2000-06-04

---
 pc/ether8390.c | 20 +++++++++++++++-----
 pc/etherec2t.c | 48 ++++++++++++++++++++++++++++++++++++++++--------
 2 files changed, 55 insertions(+), 13 deletions(-)

diff --git a/pc/ether8390.c b/pc/ether8390.c
index 1eb8b79f7785b47129b6741525b44a63fdbfdd2a..a60d8c7d2c60f89cd7cee2520a034e934e223937 100644
--- a/pc/ether8390.c
+++ b/pc/ether8390.c
@@ -535,7 +535,7 @@ overflow(Ether *ether)
 	regw(ctlr, Cr, Page0|RdABORT|Sta);
 	receive(ether);
 	regw(ctlr, Isr, Ovw);
-	regw(ctlr, Tcr, 0);
+	regw(ctlr, Tcr, LpbkNORMAL);
 
 	if(resend)
 		regw(ctlr, Cr, Page0|RdABORT|Txp|Sta);
@@ -555,7 +555,7 @@ interrupt(Ureg*, void* arg)
 	 * While there is something of interest,
 	 * clear all the interrupts and process.
 	 */
-	lock(ctlr);
+	ilock(ctlr);
 	regw(ctlr, Imr, 0x00);
 	while(isr = (regr(ctlr, Isr) & (Cnt|Ovw|Txe|Rxe|Ptx|Prx))){
 		if(isr & Ovw){
@@ -601,7 +601,7 @@ interrupt(Ureg*, void* arg)
 		}
 	}
 	regw(ctlr, Imr, Cnt|Ovw|Txe|Rxe|Ptx|Prx);
-	unlock(ctlr);
+	iunlock(ctlr);
 }
 
 static uchar allmar[8] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
@@ -705,6 +705,10 @@ attach(Ether* ether)
 	 * 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;
 	if(ether->prom)
@@ -712,8 +716,11 @@ attach(Ether* ether)
 	if(ether->nmaddr)
 		r |= Am;
 	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);
 }
@@ -759,7 +766,7 @@ dp8390reset(Ether* ether)
 	regw(ctlr, Rbcr0, 0);
 	regw(ctlr, Rbcr1, 0);
 
-	regw(ctlr, Tcr, 0);
+	regw(ctlr, Tcr, LpbkNIC);
 	regw(ctlr, Rcr, Mon);
 
 	/*
@@ -770,8 +777,11 @@ dp8390reset(Ether* ether)
 	ringinit(ctlr);
 	regw(ctlr, Tpsr, ctlr->tstart);
 
+	/*
+	 * Clear any pending interrupts and mask then all off.
+	 */
 	regw(ctlr, Isr, 0xFF);
-	regw(ctlr, Imr, Cnt|Ovw|Txe|Rxe|Ptx|Prx);
+	regw(ctlr, Imr, 0);
 
 	/*
 	 * Leave the chip initialised,
diff --git a/pc/etherec2t.c b/pc/etherec2t.c
index 1e78de08201475355c2542bc079dc8ea8846f95e..72a5ba3a729d562d340b9ffa85740c01f7805885 100644
--- a/pc/etherec2t.c
+++ b/pc/etherec2t.c
@@ -1,6 +1,7 @@
 /*
- * Linksys Combo PCMCIA EthernetCard (EC2T).
- * Supposedly an NE2000 clone, see the comments in ether2000.c
+ * Linksys Combo PCMCIA EthernetCard (EC2T)
+ * and EtherFast 10/100 PC Card (PCMPC100).
+ * Supposedly NE2000 clones, see the comments in ether2000.c
  */
 #include "u.h"
 #include "../port/lib.h"
@@ -13,11 +14,18 @@
 
 #include "etherif.h"
 #include "ether8390.h"
+
 enum {
 	Data		= 0x10,		/* offset from I/O base of data port */
 	Reset		= 0x1F,		/* offset from I/O base of reset port */
 };
 
+static char* ec2tpcmcia[] = {
+	"EC2T",
+	"PCMPC100",
+	nil,
+};
+
 static int
 reset(Ether* ether)
 {
@@ -25,7 +33,8 @@ reset(Ether* ether)
 	ulong port;
 	Dp8390 *ctlr;
 	int i, slot;
-	uchar ea[Eaddrlen];
+	uchar ea[Eaddrlen], sum, x;
+	char *type;
 
 	/*
 	 * Set up the software configuration.
@@ -46,7 +55,14 @@ reset(Ether* ether)
 
 	if(ioalloc(ether->port, 0x20, 0, "ec2t") < 0)
 		return -1;
-	if((slot = pcmspecial(ether->type, ether)) < 0){
+	slot = -1;
+	type = nil;
+	for(i = 0; ec2tpcmcia[i] != nil; i++){
+		type = ec2tpcmcia[i];
+		if((slot = pcmspecial(type, ether)) >= 0)
+			break;
+	}
+	if(slot < 0){
 		iofree(port);
 		return -1;
 	}
@@ -79,7 +95,7 @@ reset(Ether* ether)
 	delay(2);
 	outb(port+Reset, buf[0]);
 	delay(2);
-	
+
 	/*
 	 * Init the (possible) chip, then use the (possible)
 	 * chip to read the (possible) PROM for ethernet address
@@ -90,9 +106,25 @@ reset(Ether* ether)
 	 * match.
 	 */
 	dp8390reset(ether);
-	memset(buf, 0, sizeof(buf));
-	dp8390read(ctlr, buf, 0, sizeof(buf));
-	if((buf[0x0E] & 0xFF) != 0x57 || (buf[0x0F] & 0xFF) != 0x57){
+	sum = 0;
+	if(strcmp(type, "PCMPC100")){
+		memset(buf, 0, sizeof(buf));
+		dp8390read(ctlr, buf, 0, sizeof(buf));
+		if((buf[0x0E] & 0xFF) == 0x57 && (buf[0x0F] & 0xFF) == 0x57)
+			sum = 0xFF;
+	}
+	else{
+		/*
+		 * The PCMPC100 has the ethernet address in I/O space.
+		 * There's a checksum over 8 bytes which sums to 0xFF.
+		 */
+		for(i = 0; i < 8; i++){
+			x = inb(port+0x14+i);
+			sum += x;
+			buf[i] = (x<<8)|x;
+		}
+	}
+	if(sum != 0xFF){
 		pcmspecialclose(slot);
 		iofree(ether->port);
 		free(ether->ctlr);