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-rw-r--r--src/southbridge/via/vt8231/vt8231_early_smbus.c274
1 files changed, 191 insertions, 83 deletions
diff --git a/src/southbridge/via/vt8231/vt8231_early_smbus.c b/src/southbridge/via/vt8231/vt8231_early_smbus.c
index 44672be310..1dacb964e8 100644
--- a/src/southbridge/via/vt8231/vt8231_early_smbus.c
+++ b/src/southbridge/via/vt8231/vt8231_early_smbus.c
@@ -1,114 +1,222 @@
#define SMBUS_IO_BASE 0x5000
-#define SMBGSTATUS 0xe0
-#define SMBGCTL 0xe2
-#define SMBHSTADDR 0xe4
-#define SMBHSTDAT 0xe6
-#define SMBHSTCMD 0xe8
-#define SMBHSTFIFO 0xe9
+#define SMBHSTSTAT 0x0
+#define SMBSLVSTAT 0x1
+#define SMBHSTCTL 0x2
+#define SMBHSTCMD 0x3
+#define SMBXMITADD 0x4
+#define SMBHSTDAT0 0x5
+#define SMBHSTDAT1 0x6
+#define SMBBLKDAT 0x7
+#define SMBSLVCTL 0x8
+#define SMBTRNSADD 0x9
+#define SMBSLVDATA 0xa
+#define SMLINK_PIN_CTL 0xe
+#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 SMBUS_TIMEOUT (100*1000*10)
static void enable_smbus(void)
{
device_t dev;
- /* Power management controller */
- dev = pci_locate_device(PCI_ID(0x1106,0x8235), 0);
+ unsigned char c;
+ /* Power management controller */
+ dev = pci_locate_device(PCI_ID(0x1106,0x8235), 0);
+
+ if (dev == PCI_DEV_INVALID) {
+ die("SMBUS controller not found\r\n");
+ }
- 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);
- // set IO base address to SMBUS_IO_BASE
- 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);
- // Enable SMBus
- pci_write_config8(dev, 0xd2, 0x01);
+ c = pci_read_config8(dev, 0x54);
+ c &= ~0x80;
+ pci_write_config8(dev, 0xd2, c);
- print_debug("SMBus controller enabled\r\n");
+ print_debug("SMBus controller enabled\r\n");
}
static inline void smbus_delay(void)
{
- outb(0x80, 0x80);
+ outb(0x80, 0x80);
}
static int smbus_wait_until_ready(void)
{
- unsigned long loops;
- loops = SMBUS_TIMEOUT;
- do {
- unsigned short val;
- smbus_delay();
- val = inw(SMBUS_IO_BASE + SMBGSTATUS);
- if ((val & 0x800) == 0) {
- break;
- }
- } while(--loops);
- return loops?0:-1;
+ unsigned long loops;
+ loops = SMBUS_TIMEOUT;
+ do {
+ unsigned char val;
+ smbus_delay();
+ c = my_inb(smbus_io_base + SMBHSTSTAT);
+ while((c & 1) == 1) {
+ printk_err("c is 0x%x\n", c);
+ c = my_inb(smbus_io_base + SMBHSTSTAT);
+ /* nop */
+ }
+
+ } while(--loops);
+ return loops?0:-1;
+}
+
+void smbus_reset(void)
+{
+ my_outb(HOST_RESET, smbus_io_base + SMBHSTSTAT);
+ my_outb(HOST_RESET, smbus_io_base + SMBHSTSTAT);
+ my_outb(HOST_RESET, smbus_io_base + SMBHSTSTAT);
+ my_outb(HOST_RESET, smbus_io_base + SMBHSTSTAT);
+
+ smbus_wait_until_ready();
+ printk_err("After reset status %#x\n", my_inb(smbus_io_base + SMBHSTSTAT));
}
+
+
static int smbus_wait_until_done(void)
{
- unsigned long loops;
- loops = SMBUS_TIMEOUT;
- do {
- unsigned short val;
- smbus_delay();
+ unsigned long loops;
+ loops = SMBUS_TIMEOUT;
+ do {
+ unsigned char val;
+ smbus_delay();
- val = inw(SMBUS_IO_BASE + SMBGSTATUS);
- if (((val & 0x8) == 0) | ((val & 0x437) != 0)) {
- break;
- }
- } while(--loops);
- return loops?0:-1;
+ byte = my_inb(smbus_io_base + SMBHSTSTAT);
+ if (byte & 1)
+ break;
+
+ } while(--loops);
+ return loops?0:-1;
}
-static int smbus_read_byte(unsigned device, unsigned address)
+static void smbus_print_error(unsigned char host_status_register)
{
- unsigned char global_control_register;
- unsigned char global_status_register;
- unsigned char byte;
-
- if (smbus_wait_until_ready() < 0) {
- return -1;
- }
-
- /* 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);
- /* set the command/address... */
- outb(address & 0xFF, SMBUS_IO_BASE + SMBHSTCMD);
- /* set up for a byte data read */
- outw((inw(SMBUS_IO_BASE + SMBGCTL) & ~7) | (0x2), 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(0, SMBUS_IO_BASE + SMBHSTDAT);
-
- /* start the command */
- outw((inw(SMBUS_IO_BASE + SMBGCTL) | (1 << 3)), SMBUS_IO_BASE + SMBGCTL);
-
-
- /* poll for transaction completion */
- if (smbus_wait_until_done() < 0) {
- return -1;
- }
-
- global_status_register = inw(SMBUS_IO_BASE + SMBGSTATUS);
-
- /* read results of transaction */
- byte = inw(SMBUS_IO_BASE + SMBHSTDAT) & 0xff;
-
- if (global_status_register != (1 << 4)) {
- return -1;
- }
- return byte;
+
+ printk_err("smbus_error: 0x%02x\n", host_status_register);
+ if (host_status_register & (1 << 4)) {
+ printk_err("Interrup/SMI# was Failed Bus Transaction\n");
+ }
+ if (host_status_register & (1 << 3)) {
+ printk_err("Bus Error\n");
+ }
+ if (host_status_register & (1 << 2)) {
+ printk_err("Device Error\n");
+ }
+ if (host_status_register & (1 << 1)) {
+ printk_err("Interrupt/SMI# was Successful Completion\n");
+ }
+ if (host_status_register & (1 << 0)) {
+ printk_err("Host Busy\n");
+ }
+}
+
+
+/* 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(unsigned char devAdr, unsigned char bIndex,
+ unsigned char *result)
+{
+ unsigned short i;
+ unsigned char bData;
+ unsigned char sts;
+
+ /* clear host status */
+ my_outb(0xff, smbus_io_base);
+
+ /* check SMBUS ready */
+ for ( i = 0; i < 0xFFFF; i++ )
+ if ( (my_inb(smbus_io_base) & 0x01) == 0 )
+ break;
+
+ /* set host command */
+ my_outb(bIndex, smbus_io_base+3);
+
+ /* set slave address */
+ my_outb(devAdr | 0x01, smbus_io_base+4);
+
+ /* start */
+ my_outb(0x48, smbus_io_base+2);
+
+ /* SMBUS Wait Ready */
+ for ( i = 0; i < 0xFFFF; i++ )
+ if ( ((sts = my_inb(smbus_io_base)) & 0x01) == 0 )
+ break;
+ if ((sts & ~3) != 0) {
+ smbus_print_error(sts);
+ return 0;
+ }
+ bData=my_inb(smbus_io_base+5);
+
+ *result = bData;
+
+ /* return 1 if ok */
+ return 1;
+
}
+
+/* for reference, here is the fancier version which we will use at some
+ * point
+ */
+# if 0
+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 */
+ my_outb(my_inb(smbus_io_base + SMBHSTCTL) & (~1), smbus_io_base + SMBHSTCTL);
+ /* set the device I'm talking too */
+ my_outb(((device & 0x7f) << 1) | 1, smbus_io_base + SMBXMITADD);
+ /* set the command/address... */
+ my_outb(address & 0xFF, smbus_io_base + SMBHSTCMD);
+ /* set up for a byte data read */
+ my_outb((my_inb(smbus_io_base + SMBHSTCTL) & 0xE3) | (0x2 << 2),
+ smbus_io_base + SMBHSTCTL);
+
+ /* clear any lingering errors, so the transaction will run */
+ my_outb(my_inb(smbus_io_base + SMBHSTSTAT), smbus_io_base + SMBHSTSTAT);
+
+ /* clear the data byte...*/
+ my_outb(0, smbus_io_base + SMBHSTDAT0);
+
+ /* start the command */
+ my_outb((my_inb(smbus_io_base + SMBHSTCTL) | 0x40),
+ smbus_io_base + SMBHSTCTL);
+
+ /* poll for transaction completion */
+ smbus_wait_until_done();
+
+ host_status_register = my_inb(smbus_io_base + SMBHSTSTAT);
+
+ /* Ignore the In Use Status... */
+ host_status_register &= ~(1 << 6);
+
+ /* read results of transaction */
+ byte = my_inb(smbus_io_base + SMBHSTDAT0);
+ smbus_print_error(byte);
+
+ *result = byte;
+ return host_status_register != 0x02;
+}
+
+
+#endif
+
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