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#define SMBUS_IO_BASE 0x5000
#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;
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");
}
// 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);
/* make it work for I/O ...
*/
dev = pci_locate_device(PCI_ID(0x1106,0x8231), 0);
c = pci_read_config8(dev, 4);
c |= 1;
pci_write_config8(dev, 4, c);
print_err_hex8(c);
print_err(" is the comm register\n");
print_debug("SMBus controller enabled\r\n");
}
static inline void smbus_delay(void)
{
outb(0x80, 0x80);
}
static int smbus_wait_until_ready(void)
{
unsigned char c;
unsigned long loops;
loops = SMBUS_TIMEOUT;
do {
unsigned char val;
smbus_delay();
c = inb(SMBUS_IO_BASE + SMBHSTSTAT);
while((c & 1) == 1) {
print_err("c is ");
print_err_hex8(c);
print_err("\n");
c = inb(SMBUS_IO_BASE + SMBHSTSTAT);
/* nop */
}
} while(--loops);
return loops?0:-1;
}
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);
outb(HOST_RESET, SMBUS_IO_BASE + SMBHSTSTAT);
smbus_wait_until_ready();
print_err("After reset status ");
print_err_hex8( inb(SMBUS_IO_BASE + SMBHSTSTAT));
print_err("\n");
}
static int smbus_wait_until_done(void)
{
unsigned long loops;
unsigned char byte;
loops = SMBUS_TIMEOUT;
do {
unsigned char val;
smbus_delay();
byte = inb(SMBUS_IO_BASE + SMBHSTSTAT);
if (byte & 1)
break;
} while(--loops);
return loops?0:-1;
}
static void smbus_print_error(unsigned char host_status_register)
{
print_err("smbus_error: ");
print_err_hex8(host_status_register);
print_err("\n");
if (host_status_register & (1 << 4)) {
print_err("Interrup/SMI# was Failed Bus Transaction\n");
}
if (host_status_register & (1 << 3)) {
print_err("Bus Error\n");
}
if (host_status_register & (1 << 2)) {
print_err("Device Error\n");
}
if (host_status_register & (1 << 1)) {
print_err("Interrupt/SMI# was Successful Completion\n");
}
if (host_status_register & (1 << 0)) {
print_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_byte(unsigned char devAdr,
unsigned char bIndex)
{
unsigned short i;
unsigned char bData;
unsigned char sts = 0;
/* clear host status */
outb(0xff, SMBUS_IO_BASE);
/* check SMBUS ready */
for ( i = 0; i < 0xFFFF; i++ )
if ( (inb(SMBUS_IO_BASE) & 0x01) == 0 )
break;
/* set host command */
outb(bIndex, SMBUS_IO_BASE+3);
/* set slave address */
outb(devAdr | 0x01, SMBUS_IO_BASE+4);
/* start */
outb(0x48, SMBUS_IO_BASE+2);
/* SMBUS Wait Ready */
for ( i = 0; i < 0xFFFF; 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);
return bData;
}
/* 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 */
outb(inb(SMBUS_IO_BASE + SMBHSTCTL) & (~1), 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 the command */
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
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