diff options
Diffstat (limited to 'src/southbridge/nvidia/ck804/ck804_smbus.h')
| -rw-r--r-- | src/southbridge/nvidia/ck804/ck804_smbus.h | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/src/southbridge/nvidia/ck804/ck804_smbus.h b/src/southbridge/nvidia/ck804/ck804_smbus.h new file mode 100644 index 0000000000..079007836f --- /dev/null +++ b/src/southbridge/nvidia/ck804/ck804_smbus.h @@ -0,0 +1,202 @@ +/* + * Copyright 2004 Tyan Computer + * by yhlu@tyan.com + */ +#include <device/smbus_def.h> + +#define SMBHSTSTAT 0x1 +#define SMBHSTPRTCL 0x0 +#define SMBHSTCMD 0x3 +#define SMBXMITADD 0x2 +#define SMBHSTDAT0 0x4 +#define SMBHSTDAT1 0x5 + +/* Between 1-10 seconds, We should never timeout normally + * Longer than this is just painful when a timeout condition occurs. + */ +#define SMBUS_TIMEOUT (100*1000*10) + +static inline void smbus_delay(void) +{ + outb(0x80, 0x80); +} + +static int smbus_wait_until_ready(unsigned smbus_io_base) +{ + unsigned long loops; + loops = SMBUS_TIMEOUT; + do { + unsigned char val; + smbus_delay(); + val = inb(smbus_io_base + SMBHSTSTAT); + if ((val & 0x1f) == 0) { + break; + } + if(loops == (SMBUS_TIMEOUT / 2)) { + outb((val & 0x1f),smbus_io_base + SMBHSTSTAT); + } + } while(--loops); + return loops?0:-2; +} + +static int smbus_wait_until_done(unsigned smbus_io_base) +{ + unsigned long loops; + loops = SMBUS_TIMEOUT; + do { + unsigned char val; + smbus_delay(); + + val = inb(smbus_io_base + SMBHSTSTAT); + if ( (val & 0xff) != 0) { + break; + } + } while(--loops); + return loops?0:-3; +} +static int do_smbus_recv_byte(unsigned smbus_io_base, unsigned device) +{ + unsigned char global_status_register; + unsigned char byte; +#if 0 +// Don't need, when you write to PRTCL, the status will be cleared automatically + if (smbus_wait_until_ready(smbus_io_base) < 0) { + return -2; + } +#endif + + /* set the device I'm talking too */ + outb(((device & 0x7f) << 1)|1 , smbus_io_base + SMBXMITADD); + smbus_delay(); + /* set the command/address... */ + outb(0, smbus_io_base + SMBHSTCMD); + smbus_delay(); + /* byte data recv */ + outb(0x05, smbus_io_base + SMBHSTPRTCL); + smbus_delay(); + + /* poll for transaction completion */ + if (smbus_wait_until_done(smbus_io_base) < 0) { + return -3; + } + + global_status_register = inb(smbus_io_base + SMBHSTSTAT) & 0x80; /* lose check */ + + /* read results of transaction */ + byte = inb(smbus_io_base + SMBHSTDAT0); + + if (global_status_register != 0x80) { // lose check, otherwise it should be 0 + return -1; + } + return byte; +} +static int do_smbus_send_byte(unsigned smbus_io_base, unsigned device, unsigned char val) +{ + unsigned global_status_register; + +#if 0 +// Don't need, when you write to PRTCL, the status will be cleared automatically + if (smbus_wait_until_ready(smbus_io_base) < 0) { + return -2; + } +#endif + + outb(val, smbus_io_base + SMBHSTDAT0); + smbus_delay(); + + /* set the device I'm talking too */ + outb(((device & 0x7f) << 1) | 0, smbus_io_base + SMBXMITADD); + smbus_delay(); + + outb(0, smbus_io_base + SMBHSTCMD); + smbus_delay(); + + /* set up for a byte data write */ + outb(0x04, smbus_io_base + SMBHSTPRTCL); + smbus_delay(); + + /* poll for transaction completion */ + if (smbus_wait_until_done(smbus_io_base) < 0) { + return -3; + } + global_status_register = inb(smbus_io_base + SMBHSTSTAT) & 0x80; /* lose check */; + + if (global_status_register != 0x80) { + return -1; + } + return 0; +} +static int do_smbus_read_byte(unsigned smbus_io_base, unsigned device, unsigned address) +{ + unsigned char global_status_register; + unsigned char byte; +#if 0 +// Don't need, when you write to PRTCL, the status will be cleared automatically + if (smbus_wait_until_ready(smbus_io_base) < 0) { + return -2; + } +#endif + + /* set the device I'm talking too */ + outb(((device & 0x7f) << 1)|1 , smbus_io_base + SMBXMITADD); + smbus_delay(); + /* set the command/address... */ + outb(address & 0xff, smbus_io_base + SMBHSTCMD); + smbus_delay(); + /* byte data read */ + outb(0x07, smbus_io_base + SMBHSTPRTCL); + smbus_delay(); + + /* poll for transaction completion */ + if (smbus_wait_until_done(smbus_io_base) < 0) { + return -3; + } + + global_status_register = inb(smbus_io_base + SMBHSTSTAT) & 0x80; /* lose check */ + + /* read results of transaction */ + byte = inb(smbus_io_base + SMBHSTDAT0); + + if (global_status_register != 0x80) { // lose check, otherwise it should be 0 + return -1; + } + return byte; +} + + +static int do_smbus_write_byte(unsigned smbus_io_base, unsigned device, unsigned address, unsigned char val) +{ + unsigned global_status_register; + +#if 0 +// Don't need, when you write to PRTCL, the status will be cleared automatically + if (smbus_wait_until_ready(smbus_io_base) < 0) { + return -2; + } +#endif + + outb(val, smbus_io_base + SMBHSTDAT0); + smbus_delay(); + + /* set the device I'm talking too */ + outb(((device & 0x7f) << 1) | 0, smbus_io_base + SMBXMITADD); + smbus_delay(); + + outb(address & 0xff, smbus_io_base + SMBHSTCMD); + smbus_delay(); + + /* set up for a byte data write */ + outb(0x06, smbus_io_base + SMBHSTPRTCL); + smbus_delay(); + + /* poll for transaction completion */ + if (smbus_wait_until_done(smbus_io_base) < 0) { + return -3; + } + global_status_register = inb(smbus_io_base + SMBHSTSTAT) & 0x80; /* lose check */; + + if (global_status_register != 0x80) { + return -1; + } + return 0; +} |