diff options
Diffstat (limited to 'src/southbridge/via/vt8235/vt8235_early_smbus.c')
| -rw-r--r-- | src/southbridge/via/vt8235/vt8235_early_smbus.c | 74 |
1 files changed, 37 insertions, 37 deletions
diff --git a/src/southbridge/via/vt8235/vt8235_early_smbus.c b/src/southbridge/via/vt8235/vt8235_early_smbus.c index db403eb5fb..1876461a3d 100644 --- a/src/southbridge/via/vt8235/vt8235_early_smbus.c +++ b/src/southbridge/via/vt8235/vt8235_early_smbus.c @@ -12,7 +12,7 @@ #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 @@ -34,17 +34,17 @@ static void enable_smbus(void) /* Power management controller */ 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\n"); - } + } // set IO base address to SMBUS_IO_BASE pci_write_config16(dev, 0xd0, SMBUS_IO_BASE | 1); - - // Enable SMBus + + // Enable SMBus pci_write_config8(dev, 0xd2, (0x4 << 1) | 1); - + /* make it work for I/O ... */ pci_write_config16(dev, 4, 1); @@ -55,13 +55,13 @@ static void enable_smbus(void) for(i = 0 ; i < 5000 ; i++) outb(0x80,0x80); - /* + /* * 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(0x7f, SMBUS_IO_BASE+SMBHSTDAT0); + outb(0xff, SMBUS_IO_BASE+SMBHSTSTAT); + 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); @@ -92,7 +92,7 @@ static int smbus_wait_until_ready(void) print_debug_hex8(c); print_debug("\n"); c = inb(SMBUS_IO_BASE + SMBHSTSTAT); - /* nop */ + /* nop */ } } while(--loops); @@ -105,13 +105,13 @@ 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("\n"); } - + static int smbus_wait_until_done(void) @@ -121,11 +121,11 @@ static int smbus_wait_until_done(void) loops = SMBUS_TIMEOUT; do { smbus_delay(); - + byte = inb(SMBUS_IO_BASE + SMBHSTSTAT); if (byte & 1) break; - + } while(--loops); return loops?0:-1; } @@ -156,46 +156,46 @@ static void smbus_print_error(unsigned char host_status_register) /* 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 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) & 0x1f)) & 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 +/* for reference, here is the fancier version which we will use at some * point */ # if 0 @@ -203,11 +203,11 @@ 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); @@ -218,29 +218,29 @@ int smbus_read_byte(unsigned device, unsigned address, unsigned char *result) /* 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; } |