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Diffstat (limited to 'src/southbridge/nvidia/ck804/ck804_smbus.h')
-rw-r--r--src/southbridge/nvidia/ck804/ck804_smbus.h157
1 files changed, 82 insertions, 75 deletions
diff --git a/src/southbridge/nvidia/ck804/ck804_smbus.h b/src/southbridge/nvidia/ck804/ck804_smbus.h
index 038b602455..8067ffb9a5 100644
--- a/src/southbridge/nvidia/ck804/ck804_smbus.h
+++ b/src/southbridge/nvidia/ck804/ck804_smbus.h
@@ -2,19 +2,21 @@
* Copyright 2004 Tyan Computer
* by yhlu@tyan.com
*/
+
#include <device/smbus_def.h>
-#define SMBHSTSTAT 0x1
-#define SMBHSTPRTCL 0x0
-#define SMBHSTCMD 0x3
-#define SMBXMITADD 0x2
-#define SMBHSTDAT0 0x4
-#define SMBHSTDAT1 0x5
+#define SMBHSTSTAT 0x1
+#define SMBHSTPRTCL 0x0
+#define SMBHSTCMD 0x3
+#define SMBXMITADD 0x2
+#define SMBHSTDAT0 0x4
+#define SMBHSTDAT1 0x5
-/* Between 1-10 seconds, We should never timeout normally
+/*
+ * Between 1-10 seconds, We should never timeout normally.
* Longer than this is just painful when a timeout condition occurs.
*/
-#define SMBUS_TIMEOUT (100*1000*10)
+#define SMBUS_TIMEOUT (100 * 1000 * 10)
static inline void smbus_delay(void)
{
@@ -30,11 +32,10 @@ static int smbus_wait_until_ready(unsigned smbus_io_base)
smbus_delay();
val = inb(smbus_io_base + SMBHSTSTAT);
val &= 0x1f;
- if (val == 0) {
+ if (val == 0)
return 0;
- }
- outb(val,smbus_io_base + SMBHSTSTAT);
- } while(--loops);
+ outb(val, smbus_io_base + SMBHSTSTAT);
+ } while (--loops);
return -2;
}
@@ -45,158 +46,164 @@ static int smbus_wait_until_done(unsigned smbus_io_base)
do {
unsigned char val;
smbus_delay();
-
val = inb(smbus_io_base + SMBHSTSTAT);
- if ( (val & 0xff) != 0) {
+ if ((val & 0xff) != 0)
return 0;
- }
- } while(--loops);
+ } while (--loops);
return -3;
}
+
static int do_smbus_recv_byte(unsigned smbus_io_base, unsigned device)
{
- unsigned char global_status_register;
- unsigned char byte;
+ unsigned char global_status_register, byte;
+
#if 0
-// Don't need, when you write to PRTCL, the status will be cleared automatically
- if (smbus_wait_until_ready(smbus_io_base) < 0) {
+ /* Not needed, upon write to PRTCL, the status will be auto-cleared. */
+ if (smbus_wait_until_ready(smbus_io_base) < 0)
return -2;
- }
#endif
- /* set the device I'm talking too */
- outb(((device & 0x7f) << 1)|1 , smbus_io_base + SMBXMITADD);
+ /* Set the device I'm talking to. */
+ outb(((device & 0x7f) << 1) | 1, smbus_io_base + SMBXMITADD);
smbus_delay();
- /* set the command/address... */
+
+ /* Set the command/address. */
outb(0, smbus_io_base + SMBHSTCMD);
smbus_delay();
- /* byte data recv */
+
+ /* Byte data recv */
outb(0x05, smbus_io_base + SMBHSTPRTCL);
smbus_delay();
- /* poll for transaction completion */
- if (smbus_wait_until_done(smbus_io_base) < 0) {
+ /* Poll for transaction completion. */
+ if (smbus_wait_until_done(smbus_io_base) < 0)
return -3;
- }
- global_status_register = inb(smbus_io_base + SMBHSTSTAT) & 0x80; /* lose check */
+ /* Lose check */
+ global_status_register = inb(smbus_io_base + SMBHSTSTAT) & 0x80;
- /* read results of transaction */
+ /* Read results of transaction. */
byte = inb(smbus_io_base + SMBHSTDAT0);
- if (global_status_register != 0x80) { // lose check, otherwise it should be 0
+ /* Lose check, otherwise it should be 0. */
+ if (global_status_register != 0x80)
return -1;
- }
+
return byte;
}
-static int do_smbus_send_byte(unsigned smbus_io_base, unsigned device, unsigned char val)
+
+static int do_smbus_send_byte(unsigned smbus_io_base, unsigned device,
+ unsigned char val)
{
unsigned global_status_register;
#if 0
-// Don't need, when you write to PRTCL, the status will be cleared automatically
- if (smbus_wait_until_ready(smbus_io_base) < 0) {
+ /* Not needed, upon write to PRTCL, the status will be auto-cleared. */
+ if (smbus_wait_until_ready(smbus_io_base) < 0)
return -2;
- }
#endif
outb(val, smbus_io_base + SMBHSTDAT0);
smbus_delay();
- /* set the device I'm talking too */
+ /* Set the device I'm talking to. */
outb(((device & 0x7f) << 1) | 0, smbus_io_base + SMBXMITADD);
smbus_delay();
outb(0, smbus_io_base + SMBHSTCMD);
smbus_delay();
- /* set up for a byte data write */
+ /* Set up for a byte data write. */
outb(0x04, smbus_io_base + SMBHSTPRTCL);
smbus_delay();
- /* poll for transaction completion */
- if (smbus_wait_until_done(smbus_io_base) < 0) {
+ /* Poll for transaction completion. */
+ if (smbus_wait_until_done(smbus_io_base) < 0)
return -3;
- }
- global_status_register = inb(smbus_io_base + SMBHSTSTAT) & 0x80; /* lose check */;
- if (global_status_register != 0x80) {
+ /* Lose check */
+ global_status_register = inb(smbus_io_base + SMBHSTSTAT) & 0x80;
+
+ if (global_status_register != 0x80)
return -1;
- }
+
return 0;
}
-static int do_smbus_read_byte(unsigned smbus_io_base, unsigned device, unsigned address)
+
+static int do_smbus_read_byte(unsigned smbus_io_base, unsigned device,
+ unsigned address)
{
- unsigned char global_status_register;
- unsigned char byte;
+ unsigned char global_status_register, byte;
+
#if 0
-// Don't need, when you write to PRTCL, the status will be cleared automatically
- if (smbus_wait_until_ready(smbus_io_base) < 0) {
+ /* Not needed, upon write to PRTCL, the status will be auto-cleared. */
+ if (smbus_wait_until_ready(smbus_io_base) < 0)
return -2;
- }
#endif
- /* set the device I'm talking too */
- outb(((device & 0x7f) << 1)|1 , smbus_io_base + SMBXMITADD);
+ /* Set the device I'm talking to. */
+ outb(((device & 0x7f) << 1) | 1, smbus_io_base + SMBXMITADD);
smbus_delay();
- /* set the command/address... */
+
+ /* Set the command/address. */
outb(address & 0xff, smbus_io_base + SMBHSTCMD);
smbus_delay();
- /* byte data read */
+
+ /* Byte data read */
outb(0x07, smbus_io_base + SMBHSTPRTCL);
smbus_delay();
- /* poll for transaction completion */
- if (smbus_wait_until_done(smbus_io_base) < 0) {
+ /* Poll for transaction completion. */
+ if (smbus_wait_until_done(smbus_io_base) < 0)
return -3;
- }
- global_status_register = inb(smbus_io_base + SMBHSTSTAT) & 0x80; /* lose check */
+ /* Lose check */
+ global_status_register = inb(smbus_io_base + SMBHSTSTAT) & 0x80;
- /* read results of transaction */
+ /* Read results of transaction. */
byte = inb(smbus_io_base + SMBHSTDAT0);
- if (global_status_register != 0x80) { // lose check, otherwise it should be 0
+ /* Lose check, otherwise it should be 0. */
+ if (global_status_register != 0x80)
return -1;
- }
+
return byte;
}
-
-static int do_smbus_write_byte(unsigned smbus_io_base, unsigned device, unsigned address, unsigned char val)
+static int do_smbus_write_byte(unsigned smbus_io_base, unsigned device,
+ unsigned address, unsigned char val)
{
unsigned global_status_register;
#if 0
-// Don't need, when you write to PRTCL, the status will be cleared automatically
- if (smbus_wait_until_ready(smbus_io_base) < 0) {
+ /* Not needed, upon write to PRTCL, the status will be auto-cleared. */
+ if (smbus_wait_until_ready(smbus_io_base) < 0)
return -2;
- }
#endif
outb(val, smbus_io_base + SMBHSTDAT0);
smbus_delay();
- /* set the device I'm talking too */
+ /* Set the device I'm talking to. */
outb(((device & 0x7f) << 1) | 0, smbus_io_base + SMBXMITADD);
smbus_delay();
outb(address & 0xff, smbus_io_base + SMBHSTCMD);
smbus_delay();
- /* set up for a byte data write */
+ /* Set up for a byte data write. */
outb(0x06, smbus_io_base + SMBHSTPRTCL);
smbus_delay();
- /* poll for transaction completion */
- if (smbus_wait_until_done(smbus_io_base) < 0) {
+ /* Poll for transaction completion. */
+ if (smbus_wait_until_done(smbus_io_base) < 0)
return -3;
- }
- global_status_register = inb(smbus_io_base + SMBHSTSTAT) & 0x80; /* lose check */;
- if (global_status_register != 0x80) {
+ /* Lose check */
+ global_status_register = inb(smbus_io_base + SMBHSTSTAT) & 0x80;
+
+ if (global_status_register != 0x80)
return -1;
- }
+
return 0;
}
-
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-06 01:56:20 +0000