From a84c6f81ef85bca8b1413324d0bccb549cf4b00b Mon Sep 17 00:00:00 2001
From: Stefan Reinauer <stepan@openbios.org>
Date: Mon, 6 Oct 2003 15:04:41 +0000
Subject: [PATCH] add smbus_write_byte() function. currently fails in romcc :(

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1197 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
---
 src/mainboard/amd/quartet/auto.c              |  5 +--
 .../amd/amd8111/amd8111_early_smbus.c         | 32 +++++++++++++++++++
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/src/mainboard/amd/quartet/auto.c b/src/mainboard/amd/quartet/auto.c
index 31a653d982..23951738c6 100644
--- a/src/mainboard/amd/quartet/auto.c
+++ b/src/mainboard/amd/quartet/auto.c
@@ -99,9 +99,10 @@ static inline int spd_read_byte(unsigned device, unsigned address)
 	unsigned hub = device >> 8;
 	
 	device &= 0xff;
-	// smbus_write_byte(SMBUS_HUB, hub);
+	smbus_write_byte(SMBUS_HUB, 0x01, 1<<hub);
+	smbus_write_byte(SMBUS_HUB, 0x03, 0);
+
 	return smbus_read_byte(device, address);
-	
 }
 
 /* no specific code here. this should go away completely */
diff --git a/src/southbridge/amd/amd8111/amd8111_early_smbus.c b/src/southbridge/amd/amd8111/amd8111_early_smbus.c
index e67d414933..e0aaa05ff4 100644
--- a/src/southbridge/amd/amd8111/amd8111_early_smbus.c
+++ b/src/southbridge/amd/amd8111/amd8111_early_smbus.c
@@ -106,3 +106,35 @@ static int smbus_read_byte(unsigned device, unsigned address)
 	}
 	return byte;
 }
+
+static void smbus_write_byte(unsigned device, unsigned address, unsigned char val)
+{
+#if 0
+	if (smbus_wait_until_ready() < 0) {
+		return;
+	}
+
+	/* setup transaction */
+	/* disable interrupts */
+	outw(inw(SMBUS_IO_BASE + SMBGCTL) & ~((1<<10)|(1<<9)|(1<<8)|(1<<4)),
+			SMBUS_IO_BASE + SMBGCTL);
+	/* set the device I'm talking too */
+	outw(((device & 0x7f) << 1) | 1, SMBUS_IO_BASE + SMBHSTADDR);
+	outb(address & 0xFF, SMBUS_IO_BASE + SMBHSTCMD);
+	/* set up for a byte data write */ /* FIXME */
+	outw((inw(SMBUS_IO_BASE + SMBGCTL) & ~7) | (0x1), SMBUS_IO_BASE + SMBGCTL);
+	/* clear any lingering errors, so the transaction will run */
+	/* Do I need to write the bits to a 1 to clear an error? */
+	outw(inw(SMBUS_IO_BASE + SMBGSTATUS), SMBUS_IO_BASE + SMBGSTATUS);
+
+	/* clear the data word...*/
+	outw(val, SMBUS_IO_BASE + SMBHSTDAT);
+
+	/* start the command */
+	outw((inw(SMBUS_IO_BASE + SMBGCTL) | (1 << 3)), SMBUS_IO_BASE + SMBGCTL);
+
+	/* poll for transaction completion */
+	smbus_wait_until_done();
+#endif
+	return;
+}