diff options
Diffstat (limited to 'src/southbridge/via/vt8235/early_smbus.c')
-rw-r--r-- | src/southbridge/via/vt8235/early_smbus.c | 247 |
1 files changed, 0 insertions, 247 deletions
diff --git a/src/southbridge/via/vt8235/early_smbus.c b/src/southbridge/via/vt8235/early_smbus.c deleted file mode 100644 index c4bca9c210..0000000000 --- a/src/southbridge/via/vt8235/early_smbus.c +++ /dev/null @@ -1,247 +0,0 @@ -#define SMBUS_IO_BASE 0xf00 - -#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 READ_CMD 0x01 // 1 in the 0 bit of SMBHSTADD states to READ - - -#define SMBUS_TIMEOUT (100*1000*10) - -#define I2C_TRANS_CMD 0x40 -#define CLOCK_SLAVE_ADDRESS 0x69 - -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); - - 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 - pci_write_config8(dev, 0xd2, (0x4 << 1) | 1); - - /* make it work for I/O ... - */ - pci_write_config16(dev, 4, 1); - - /* 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); - - /* - * 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(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) - break; - } -} - - -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 { - smbus_delay(); - c = inb(SMBUS_IO_BASE + SMBHSTSTAT); - while((c & 1) == 1) { - print_debug("c is "); - print_debug_hex8(c); - print_debug("\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_debug("After reset status "); - print_debug_hex8( inb(SMBUS_IO_BASE + SMBHSTSTAT)); - print_debug("\n"); -} - - - -static int smbus_wait_until_done(void) -{ - unsigned long loops; - unsigned char byte; - loops = SMBUS_TIMEOUT; - do { - 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("Interrupt/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 << 1) | 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 - * 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 |