From patchwork Wed Sep 16 05:36:17 2009
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Subject: patch: disable IPMI on the dell s1850
Date: Wed, 16 Sep 2009 05:36:17 -0000
From: ron minnich <rminnich@gmail.com>
X-Patchwork-Id: 255
Message-Id: <13426df10909152236r3df6ff86g29810b5aa2ad4cff@mail.gmail.com>
To: coreboot <coreboot@coreboot.org>

attached.

ron
Acked-by: Peter Stuge <peter@stuge.se>


This is a patch for killing IPMI on the s1850 -- or at least geting the BMC
out of the way of the serial port. Tested extensively in user mode.
Works and gets the BMC out of my way, which is good, because there
are few more useless things than IPMI and the BMC.
The BMC, all by itself, is the cause of most of our problems in booting
and talking to these nodes. 

Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>

Index: src/mainboard/dell/s1850/auto.c
===================================================================
--- src/mainboard/dell/s1850/auto.c	(revision 4636)
+++ src/mainboard/dell/s1850/auto.c	(working copy)
@@ -74,6 +74,107 @@
 #include "sdram/generic_sdram.c"
 
 
+/* IPMI garbage. This is all test stuff, if it really works we'll move it somewhere
+ */
+
+#define nftransport  0xc
+
+#define OBF  0
+#define IBF 1
+
+#define ipmidata  0xca0
+#define ipmicsr  0xca4
+
+
+static inline void  ibfzero(void)
+{
+	while(inb(ipmicsr) &  (1<<IBF)) 
+		;
+}
+static inline void  clearobf(void)
+{
+	(void) inb(ipmidata);
+}
+
+static inline void  waitobf(void)
+{
+	while((inb(ipmicsr) &  (1<<OBF)) == 0) 
+		;
+}
+/* quite possibly the stupidest interface ever designed. */
+static inline void  first_cmd_byte(unsigned char byte)
+{
+	ibfzero();
+	clearobf();
+	outb(0x61, ipmicsr);
+	ibfzero();
+	clearobf();
+	outb(byte, ipmidata);
+}
+
+static inline void  next_cmd_byte(unsigned char byte)
+{
+
+	ibfzero();
+	clearobf();
+	outb(byte, ipmidata);
+}
+
+static inline void  last_cmd_byte(unsigned char byte)
+{
+	outb(0x62, ipmicsr);
+
+	ibfzero();
+	clearobf();
+	outb(byte,  ipmidata);
+}
+
+static inline void read_response_byte(void)
+{
+	int val = -1;
+	if ((inb(ipmicsr)>>6) != 1)
+		return;
+
+	ibfzero();
+	waitobf();
+	val = inb(ipmidata);
+	outb(0x68, ipmidata);
+
+	/* see if it is done */
+	if ((inb(ipmicsr)>>6) != 1){
+		/* wait for the dummy read. Which describes this protocol */
+		waitobf();
+		(void)inb(ipmidata);
+	}
+}
+
+static inline void ipmidelay(void)
+{
+	int i;
+	for(i = 0; i < 1000; i++) {
+		inb(0x80);
+	}
+}
+
+static inline void bmc_foad(void)
+{
+	unsigned char c;
+	/* be safe; make sure it is really ready */
+	while ((inb(ipmicsr)>>6)) {
+		outb(0x60, ipmicsr);
+		inb(ipmidata);
+	}
+	first_cmd_byte(nftransport << 2);
+	ipmidelay();
+	next_cmd_byte(0x12);
+	ipmidelay();
+	next_cmd_byte(2);
+	ipmidelay();
+	last_cmd_byte(3);
+	ipmidelay();
+}
+
+/* end IPMI garbage */
 static void main(unsigned long bist)
 {
 	/*
@@ -100,6 +201,7 @@
 		}
 	}
 	/* Setup the console */
+	bmc_foad();
 	outb(0x87,0x2e);
 	outb(0x87,0x2e);
 	pnp_write_config(CONSOLE_SERIAL_DEV, 0x24, 0x84 | (1 << 6));