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Diffstat (limited to 'src/southbridge/via/vt8231/vt8231_early_smbus.c')
-rw-r--r--src/southbridge/via/vt8231/vt8231_early_smbus.c260
1 files changed, 127 insertions, 133 deletions
diff --git a/src/southbridge/via/vt8231/vt8231_early_smbus.c b/src/southbridge/via/vt8231/vt8231_early_smbus.c
index 056c4b5b11..dbb6e213ae 100644
--- a/src/southbridge/via/vt8231/vt8231_early_smbus.c
+++ b/src/southbridge/via/vt8231/vt8231_early_smbus.c
@@ -12,12 +12,12 @@
#define SMBTRNSADD 0x9
#define SMBSLVDATA 0xa
#define SMLINK_PIN_CTL 0xe
-#define SMBUS_PIN_CTL 0xf
+#define SMBUS_PIN_CTL 0xf
/* Define register settings */
#define HOST_RESET 0xff
-#define DIMM_BASE 0xa0 // 1010000 is base for DIMM in SMBus
-#define READ_CMD 0x01 // 1 in the 0 bit of SMBHSTADD states to READ
+#define DIMM_BASE 0xa0 // 1010000 is base for DIMM in SMBus
+#define READ_CMD 0x01 // 1 in the 0 bit of SMBHSTADD states to READ
#define SMBUS_TIMEOUT (100*1000*10)
@@ -27,29 +27,28 @@ static void enable_smbus(void)
device_t dev;
unsigned char c;
/* Power management controller */
- dev = pci_locate_device(PCI_ID(0x1106,0x8235), 0);
-
+ dev = pci_locate_device(PCI_ID(0x1106, 0x8235), 0);
+
if (dev == PCI_DEV_INVALID) {
die("SMBUS controller not found\r\n");
}
-
// set IO base address to SMBUS_IO_BASE
- pci_write_config32(dev, 0x90, SMBUS_IO_BASE|1);
-
+ pci_write_config32(dev, 0x90, SMBUS_IO_BASE | 1);
+
// Enable SMBus
c = pci_read_config8(dev, 0xd2);
c |= 5;
pci_write_config8(dev, 0xd2, c);
-
+
/* make it work for I/O ...
*/
- dev = pci_locate_device(PCI_ID(0x1106,0x8231), 0);
+ dev = pci_locate_device(PCI_ID(0x1106, 0x8231), 0);
c = pci_read_config8(dev, 4);
c |= 1;
pci_write_config8(dev, 4, c);
print_debug_hex8(c);
print_debug(" is the comm register\r\n");
-
+
print_debug("SMBus controller enabled\r\n");
}
@@ -61,52 +60,51 @@ static inline void smbus_delay(void)
static int smbus_wait_until_active(void)
{
- unsigned long loops;
- loops = SMBUS_TIMEOUT;
- do {
- unsigned char val;
- smbus_delay();
- val = inb(SMBUS_IO_BASE + SMBHSTSTAT);
- if ((val & 1)) {
- break;
- }
- } while(--loops);
- return loops?0:-4;
+ unsigned long loops;
+ loops = SMBUS_TIMEOUT;
+ do {
+ unsigned char val;
+ smbus_delay();
+ val = inb(SMBUS_IO_BASE + SMBHSTSTAT);
+ if ((val & 1)) {
+ break;
+ }
+ } while (--loops);
+ return loops ? 0 : -4;
}
static int smbus_wait_until_ready(void)
{
- unsigned long loops;
- loops = SMBUS_TIMEOUT;
- do {
- unsigned char val;
- smbus_delay();
- val = inb(SMBUS_IO_BASE + SMBHSTSTAT);
- if ((val & 1) == 0) {
- break;
- }
- if(loops == (SMBUS_TIMEOUT / 2)) {
- outb(inb(SMBUS_IO_BASE + SMBHSTSTAT),
- SMBUS_IO_BASE + SMBHSTSTAT);
- }
- } while(--loops);
- return loops?0:-2;
+ unsigned long loops;
+ loops = SMBUS_TIMEOUT;
+ do {
+ unsigned char val;
+ smbus_delay();
+ val = inb(SMBUS_IO_BASE + SMBHSTSTAT);
+ if ((val & 1) == 0) {
+ break;
+ }
+ if (loops == (SMBUS_TIMEOUT / 2)) {
+ outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT);
+ }
+ } while (--loops);
+ return loops ? 0 : -2;
}
static int smbus_wait_until_done(void)
{
- unsigned long loops;
- loops = SMBUS_TIMEOUT;
- do {
- unsigned char val;
- smbus_delay();
-
- val = inb(SMBUS_IO_BASE + SMBHSTSTAT);
- if ( (val & 1) == 0) {
- break;
- }
- } while(--loops);
- return loops?0:-3;
+ unsigned long loops;
+ loops = SMBUS_TIMEOUT;
+ do {
+ unsigned char val;
+ smbus_delay();
+
+ val = inb(SMBUS_IO_BASE + SMBHSTSTAT);
+ if ((val & 1) == 0) {
+ break;
+ }
+ } while (--loops);
+ return loops ? 0 : -3;
}
void smbus_reset(void)
@@ -115,13 +113,13 @@ void smbus_reset(void)
outb(HOST_RESET, SMBUS_IO_BASE + SMBHSTSTAT);
outb(HOST_RESET, SMBUS_IO_BASE + SMBHSTSTAT);
outb(HOST_RESET, SMBUS_IO_BASE + SMBHSTSTAT);
-
+
smbus_wait_until_ready();
print_debug("After reset status ");
- print_debug_hex8( inb(SMBUS_IO_BASE + SMBHSTSTAT));
+ print_debug_hex8(inb(SMBUS_IO_BASE + SMBHSTSTAT));
print_debug("\r\n");
}
-
+
static void smbus_print_error(unsigned char host_status_register)
{
@@ -152,96 +150,95 @@ static void smbus_print_error(unsigned char host_status_register)
*/
static int smbus_read_byte(unsigned device, unsigned address)
{
- unsigned char global_control_register;
- unsigned char global_status_register;
- unsigned char byte;
-
- if (smbus_wait_until_ready() < 0) {
- outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT);
- if ( smbus_wait_until_ready() < 0 ) {
- return -2;
- }
- }
-
- /* setup transaction */
- /* disable interrupts */
- outb(inb(SMBUS_IO_BASE + SMBHSTCTL) & 0xfe, SMBUS_IO_BASE + SMBHSTCTL);
- /* set the device I'm talking too */
- outb(((device & 0x7f) << 1) | 1, SMBUS_IO_BASE + SMBXMITADD);
- /* set the command/address... */
- outb(address & 0xFF, SMBUS_IO_BASE + SMBHSTCMD);
- /* set up for a byte data read */
- outb((inb(SMBUS_IO_BASE + SMBHSTCTL) & 0xe3) | (0x2<<2), SMBUS_IO_BASE + SMBHSTCTL);
-
- /* clear any lingering errors, so the transaction will run */
- outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT);
-
- /* clear the data byte...*/
- outb(0, SMBUS_IO_BASE + SMBHSTDAT0);
-
- /* start a byte read, with interrupts disabled */
- outb((inb(SMBUS_IO_BASE + SMBHSTCTL) | 0x40), SMBUS_IO_BASE + SMBHSTCTL);
- /* poll for it to start */
- if (smbus_wait_until_active() < 0) {
- return -4;
- }
-
- /* poll for transaction completion */
- if (smbus_wait_until_done() < 0) {
- return -3;
- }
+ unsigned char global_control_register;
+ unsigned char global_status_register;
+ unsigned char byte;
+
+ if (smbus_wait_until_ready() < 0) {
+ outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT);
+ if (smbus_wait_until_ready() < 0) {
+ return -2;
+ }
+ }
+
+ /* setup transaction */
+ /* disable interrupts */
+ outb(inb(SMBUS_IO_BASE + SMBHSTCTL) & 0xfe, SMBUS_IO_BASE + SMBHSTCTL);
+ /* set the device I'm talking too */
+ outb(((device & 0x7f) << 1) | 1, SMBUS_IO_BASE + SMBXMITADD);
+ /* set the command/address... */
+ outb(address & 0xFF, SMBUS_IO_BASE + SMBHSTCMD);
+ /* set up for a byte data read */
+ outb((inb(SMBUS_IO_BASE + SMBHSTCTL) & 0xe3) | (0x2 << 2), SMBUS_IO_BASE + SMBHSTCTL);
+
+ /* clear any lingering errors, so the transaction will run */
+ outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT);
+
+ /* clear the data byte... */
+ outb(0, SMBUS_IO_BASE + SMBHSTDAT0);
+
+ /* start a byte read, with interrupts disabled */
+ outb((inb(SMBUS_IO_BASE + SMBHSTCTL) | 0x40), SMBUS_IO_BASE + SMBHSTCTL);
+ /* poll for it to start */
+ if (smbus_wait_until_active() < 0) {
+ return -4;
+ }
+
+ /* poll for transaction completion */
+ if (smbus_wait_until_done() < 0) {
+ return -3;
+ }
/* Ignore the Host Busy & Command Complete ? */
- global_status_register = inb(SMBUS_IO_BASE + SMBHSTSTAT) & ~((1<<1)|(1<<0));
+ global_status_register = inb(SMBUS_IO_BASE + SMBHSTSTAT) & ~((1 << 1) | (1 << 0));
- /* read results of transaction */
- byte = inb(SMBUS_IO_BASE + SMBHSTDAT0);
+ /* read results of transaction */
+ byte = inb(SMBUS_IO_BASE + SMBHSTDAT0);
- if (global_status_register != 0) {
- return -1;
- }
- return byte;
+ if (global_status_register != 0) {
+ return -1;
+ }
+ return byte;
}
#if 0
/* SMBus routines borrowed from VIA's Trident Driver */
/* this works, so I am not going to touch it for now -- rgm */
-static unsigned char smbus_read_byte(unsigned char devAdr,
- unsigned char bIndex)
+static unsigned char smbus_read_byte(unsigned char devAdr, unsigned char bIndex)
{
unsigned int i;
- unsigned char bData;
- unsigned char sts = 0;
-
+ unsigned char bData;
+ unsigned char sts = 0;
+
/* clear host status */
outb(0xff, SMBUS_IO_BASE);
-
+
/* check SMBUS ready */
- for ( i = 0; i < SMBUS_TIMEOUT; i++ )
- if ( (inb(SMBUS_IO_BASE) & 0x01) == 0 )
+ for (i = 0; i < SMBUS_TIMEOUT; i++)
+ if ((inb(SMBUS_IO_BASE) & 0x01) == 0)
break;
/* set host command */
- outb(bIndex, SMBUS_IO_BASE+3);
-
+ outb(bIndex, SMBUS_IO_BASE + 3);
+
/* set slave address */
- outb(devAdr | 0x01, SMBUS_IO_BASE+4);
-
+ outb(devAdr | 0x01, SMBUS_IO_BASE + 4);
+
/* start */
- outb(0x48, SMBUS_IO_BASE+2);
-
+ outb(0x48, SMBUS_IO_BASE + 2);
+
/* SMBUS Wait Ready */
- for ( i = 0; i < SMBUS_TIMEOUT; i++ )
- if ( ((sts = inb(SMBUS_IO_BASE)) & 0x01) == 0 )
+ for (i = 0; i < SMBUS_TIMEOUT; i++)
+ if (((sts = inb(SMBUS_IO_BASE)) & 0x01) == 0)
break;
if ((sts & ~3) != 0) {
smbus_print_error(sts);
return 0;
}
- bData=inb(SMBUS_IO_BASE+5);
-
+ bData = inb(SMBUS_IO_BASE + 5);
+
return bData;
-
+
}
#endif
/* for reference, here is the fancier version which we will use at some
@@ -252,11 +249,11 @@ int smbus_read_byte(unsigned device, unsigned address, unsigned char *result)
{
unsigned char host_status_register;
unsigned char byte;
-
+
reset();
-
+
smbus_wait_until_ready();
-
+
/* setup transaction */
/* disable interrupts */
outb(inb(SMBUS_IO_BASE + SMBHSTCTL) & (~1), SMBUS_IO_BASE + SMBHSTCTL);
@@ -265,35 +262,32 @@ int smbus_read_byte(unsigned device, unsigned address, unsigned char *result)
/* set the command/address... */
outb(address & 0xFF, SMBUS_IO_BASE + SMBHSTCMD);
/* set up for a byte data read */
- outb((inb(SMBUS_IO_BASE + SMBHSTCTL) & 0xE3) | (0x2 << 2),
- SMBUS_IO_BASE + SMBHSTCTL);
-
+ outb((inb(SMBUS_IO_BASE + SMBHSTCTL) & 0xE3) | (0x2 << 2), SMBUS_IO_BASE + SMBHSTCTL);
+
/* clear any lingering errors, so the transaction will run */
outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT);
-
- /* clear the data byte...*/
+
+ /* clear the data byte... */
outb(0, SMBUS_IO_BASE + SMBHSTDAT0);
-
+
/* start the command */
- outb((inb(SMBUS_IO_BASE + SMBHSTCTL) | 0x40),
- SMBUS_IO_BASE + SMBHSTCTL);
-
+ outb((inb(SMBUS_IO_BASE + SMBHSTCTL) | 0x40), SMBUS_IO_BASE + SMBHSTCTL);
+
/* poll for transaction completion */
smbus_wait_until_done();
-
+
host_status_register = inb(SMBUS_IO_BASE + SMBHSTSTAT);
-
+
/* Ignore the In Use Status... */
host_status_register &= ~(1 << 6);
-
+
/* read results of transaction */
byte = inb(SMBUS_IO_BASE + SMBHSTDAT0);
smbus_print_error(byte);
-
+
*result = byte;
return host_status_register != 0x02;
}
#endif
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-30 04:00:57 +0000