add the _lx flavor of the 5536. This will later be merged into the

cs5536, but I don't want to mess up the OLPC, and we really need the lx
support NOW.


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2421 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 180 insertions, 0 deletions

diff --git a/src/southbridge/amd/cs5536_lx/cs5536_smbus.h b/src/southbridge/amd/cs5536_lx/cs5536_smbus.h
new file mode 100644
index 0000000000..9cf55ba29c
--- /dev/null
+++ b/src/southbridge/amd/cs5536_lx/cs5536_smbus.h
@@ -0,0 +1,180 @@
+//#include <device/smbus_def.h>
+#define SMBUS_ERROR -1
+#define SMBUS_WAIT_UNTIL_READY_TIMEOUT -2
+#define SMBUS_WAIT_UNTIL_DONE_TIMEOUT  -3
+
+#define	SMB_SDA		0x00
+#define SMB_STS		0x01
+#define SMB_CTRL_STS	0x02
+#define	SMB_CTRL1	0x03
+#define SMB_ADD		0x04
+#define SMB_CTRL2	0x05
+#define	SMB_CTRL3	0x06
+
+#define SMB_STS_SLVSTP	(0x01 << 7)
+#define SMB_STS_SDAST	(0x01 << 6)
+#define	SMB_STS_BER	(0x01 << 5)
+#define SMB_STS_NEGACK	(0x01 << 4)
+#define	SMB_STS_STASTR	(0x01 << 3)
+#define SMB_STS_NMATCH	(0x01 << 2)
+#define	SMB_STS_MASTER	(0x01 << 1)
+#define SMB_STS_XMIT	(0x01 << 0)
+
+#define	SMB_CSTS_TGSCL	(0x01 << 5)
+#define SMB_CSTS_TSDA	(0x01 << 4)
+#define	SMB_CSTS_GCMTCH	(0x01 << 3)
+#define SMB_CSTS_MATCH	(0x01 << 2)
+#define	SMB_CSTS_BB	(0x01 << 1)
+#define SMB_CSTS_BUSY	(0x01 << 0)
+
+#define	SMB_CTRL1_STASTRE (0x01 << 7)
+#define SMB_CTRL1_NMINTE  (0x01 << 6)
+#define	SMB_CTRL1_GCMEN   (0x01 << 5)
+#define SMB_CTRL1_ACK     (0x01 << 4)
+#define	SMB_CTRL1_RSVD    (0x01 << 3)
+#define SMB_CTRL1_INTEN   (0x01 << 2)
+#define	SMB_CTRL1_STOP    (0x01 << 1)
+#define SMB_CTRL1_START   (0x01 << 0)
+
+#define	SMB_ADD_SAEN	  (0x01 << 7)
+
+#define	SMB_CTRL2_ENABLE  0x01
+
+#define SMBUS_TIMEOUT (100*1000*10)
+#define SMBUS_STATUS_MASK 0xfbff
+
+#define SMBUS_IO_BASE 0x6000
+
+static void smbus_delay(void)
+{
+    	outb(0x80, 0x80);
+}
+
+/* generate a smbus start condition */
+static int smbus_start_condition(unsigned smbus_io_base)
+{
+	unsigned char val;
+	unsigned long loops;
+	loops = SMBUS_TIMEOUT;
+
+	/* issue a START condition */
+	val = inb(smbus_io_base + SMB_CTRL1);
+	outb(val | SMB_CTRL1_START, smbus_io_base + SMB_CTRL1);
+
+	/* check for bus conflict */
+	val = inb(smbus_io_base + SMB_STS);
+	if ((val & SMB_STS_BER) != 0)
+		return SMBUS_ERROR;
+
+	/* check for SDA status */
+	do {
+		smbus_delay();
+		val = inw(smbus_io_base + SMB_STS);
+		if ((val & SMB_STS_SDAST) != 0) {
+			break;
+		}
+	} while(--loops);
+	return loops?0:SMBUS_WAIT_UNTIL_READY_TIMEOUT;
+}
+
+static int smbus_check_stop_condition(unsigned smbus_io_base)
+{
+	unsigned char val;
+	unsigned long loops;
+	loops = SMBUS_TIMEOUT;
+	/* check for SDA status */
+	do {
+		smbus_delay();
+		val = inw(smbus_io_base + SMB_CTRL1);
+		if ((val & SMB_CTRL1_STOP) == 0) {
+			break;
+		}
+	} while(--loops);
+	return loops?0:SMBUS_WAIT_UNTIL_READY_TIMEOUT;
+}
+
+static int smbus_stop_condition(unsigned smbus_io_base)
+{
+	unsigned char val;
+	val = inb(smbus_io_base + SMB_CTRL1);
+	outb(SMB_CTRL1_STOP, smbus_io_base + SMB_CTRL1);
+}
+
+static int smbus_send_slave_address(unsigned smbus_io_base, unsigned char device)
+{
+	unsigned char val;
+	unsigned long loops;
+	loops = SMBUS_TIMEOUT;
+                        
+	/* send the slave address */
+	outb(device, smbus_io_base + SMB_SDA);
+
+	/* check for bus conflict and NACK */
+	val = inb(smbus_io_base + SMB_STS);
+	if (((val & SMB_STS_BER)    != 0) ||
+	    ((val & SMB_STS_NEGACK) != 0))
+		return SMBUS_ERROR;
+
+	/* check for SDA status */
+	do {
+		smbus_delay();
+		val = inw(smbus_io_base + SMB_STS);
+		if ((val & SMB_STS_SDAST) != 0) {
+			break;
+		}
+	} while(--loops);
+	return loops?0:SMBUS_WAIT_UNTIL_READY_TIMEOUT;	
+}
+
+static int smbus_send_command(unsigned smbus_io_base, unsigned char command)
+{
+        unsigned char val;
+	unsigned long loops;
+	loops = SMBUS_TIMEOUT;
+
+	/* send the command */
+	outb(command, smbus_io_base + SMB_SDA);
+
+	/* check for bus conflict and NACK */
+	val = inb(smbus_io_base + SMB_STS);
+	if (((val & SMB_STS_BER)    != 0) ||
+	    ((val & SMB_STS_NEGACK) != 0))
+		return SMBUS_ERROR;
+
+	/* check for SDA status */
+	do {
+		smbus_delay();
+		val = inw(smbus_io_base + SMB_STS);
+		if ((val & SMB_STS_SDAST) != 0) {
+			break;
+		}
+	} while(--loops);
+	return loops?0:SMBUS_WAIT_UNTIL_READY_TIMEOUT;	
+}
+
+static unsigned char do_smbus_read_byte(unsigned smbus_io_base, unsigned char device, unsigned char address)
+{
+	unsigned char val, val1;
+
+	smbus_check_stop_condition(smbus_io_base);
+
+	smbus_start_condition(smbus_io_base);
+
+	smbus_send_slave_address(smbus_io_base, device);
+
+	smbus_send_command(smbus_io_base, address);
+
+	smbus_start_condition(smbus_io_base);
+
+	smbus_send_slave_address(smbus_io_base, device | 0x01);
+
+	/* send NACK to slave */
+	val = inb(smbus_io_base + SMB_CTRL1);
+	outb(val | SMB_CTRL1_ACK, smbus_io_base + SMB_CTRL1);
+
+	val = inb(smbus_io_base + SMB_SDA);
+
+	//smbus_stop_condition(smbus_io_base);
+
+	return val;
+}