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-rw-r--r--src/southbridge/amd/amd8111/amd8111_early_smbus.c32
1 files changed, 32 insertions, 0 deletions
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;
+}