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Clean up vt8235_early_smbus a bit. 

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2038 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Jonathan McDowell 2005-09-14 16:18:30 +00:00
parent 85793c2b3f
commit 708743379a
1 changed files with 12 additions and 30 deletions
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36
src/southbridge/via/vt8235/vt8235_early_smbus.c
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@ -30,60 +30,42 @@ static void enable_smbus(void)
device_t dev;
unsigned char c;
int i;
/* Power management controller */
dev = pci_locate_device(PCI_ID(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235), 0);
dev = pci_locate_device(PCI_ID(PCI_VENDOR_ID_VIA,
PCI_DEVICE_ID_VIA_8235), 0);
if (dev == PCI_DEV_INVALID) {
die("SMBUS controller not found\r\n");
}
pci_write_config8(dev, 0xd2, (0x4 << 1 ));
// set IO base address to SMBUS_IO_BASE
pci_write_config16(dev, 0xd0, SMBUS_IO_BASE);
pci_write_config16(dev, 0xd0, SMBUS_IO_BASE | 1);
// Enable SMBus
pci_write_config8(dev, 0xd2, (0x4 << 1) | 1);
// Enable RTC
pci_write_config8(dev,0x51,0x04);
/* make it work for I/O ...
*/
pci_write_config16(dev, 4, 1);
/* tell the world we're alive - make power led flash during bios execution */
pci_write_config8(dev,0x94,0xb2);
/* FIX for half baud rate problem */
/* let clocks and the like settle */
/* as yet arbitrary count - 1000 is too little 5000 works */
for(i = 0 ; i < 5000 ; i++)
outb(0x80,0x80);
/* southbridge doesn't seem to like to do much untill after this delay, so set up
* the flashing power LED again */
pci_write_config8(dev,0x94,0xb2);
/* The VT1211 serial port needs 48 mhz clock, on power up it is getting
only 24 mhz, there is some mysterious device on the smbus that can
fix this...this code below does it. */
/*
* The VT1211 serial port needs 48 mhz clock, on power up it is getting
* only 24 mhz, there is some mysterious device on the smbus that can
* fix this...this code below does it.
* */
outb(0xff, SMBUS_IO_BASE+SMBHSTSTAT);
outb(0xff, SMBUS_IO_BASE+SMBHSTSTAT);
outb(0xff, SMBUS_IO_BASE+SMBHSTSTAT);
outb(0xff, SMBUS_IO_BASE+SMBHSTSTAT);
for( ;;) {
c = inb(SMBUS_IO_BASE+SMBHSTSTAT);
if ((c & 1) == 0)
break;
}
outb(0x7f, SMBUS_IO_BASE+SMBHSTDAT0);
outb(0x83, SMBUS_IO_BASE+SMBHSTCMD);
outb(CLOCK_SLAVE_ADDRESS<<1 , SMBUS_IO_BASE+SMBXMITADD);
outb(8 | I2C_TRANS_CMD, SMBUS_IO_BASE+SMBHSTCTL);
for (;;) {
c = inb(SMBUS_IO_BASE+SMBHSTSTAT);
if ((c & 1) == 0)