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




git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4640 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 102 insertions, 0 deletions

diff --git a/src/mainboard/dell/s1850/auto.c b/src/mainboard/dell/s1850/auto.c
index a32df1ec4d..0e07300856 100644
--- a/src/mainboard/dell/s1850/auto.c
+++ b/src/mainboard/dell/s1850/auto.c
@@ -74,6 +74,107 @@ static inline int spd_read_byte(unsigned device, unsigned address)
 #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 @@ static void main(unsigned long bist)
 		}
 	}
 	/* Setup the console */
+	bmc_foad();
 	outb(0x87,0x2e);
 	outb(0x87,0x2e);
 	pnp_write_config(CONSOLE_SERIAL_DEV, 0x24, 0x84 | (1 << 6));