diff options
Diffstat (limited to 'src/southbridge/intel/i82801er/i82801er_early_smbus.c')
| -rw-r--r-- | src/southbridge/intel/i82801er/i82801er_early_smbus.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/src/southbridge/intel/i82801er/i82801er_early_smbus.c b/src/southbridge/intel/i82801er/i82801er_early_smbus.c index ed014f1a86..d923f674ac 100644 --- a/src/southbridge/intel/i82801er/i82801er_early_smbus.c +++ b/src/southbridge/intel/i82801er/i82801er_early_smbus.c @@ -46,6 +46,21 @@ static inline void smbus_delay(void) outb(0x80, 0x80); } +static int smbus_wait_until_active(void) +{ + unsigned long loops; + loops = SMBUS_TIMEOUT; + do { + unsigned char val; + smbus_delay(); + val = inb(SMBUS_IO_BASE + SMBHSTSTAT); + if ((val & 1)) { + break; + } + } while(--loops); + return loops?0:-4; +} + static int smbus_wait_until_ready(void) { unsigned long loops; @@ -113,6 +128,10 @@ static int smbus_read_byte(unsigned device, unsigned address) /* start a byte read, with interrupts disabled */ outb((inb(SMBUS_IO_BASE + SMBHSTCTL) | 0x40), SMBUS_IO_BASE + SMBHSTCTL); + /* poll for it to start */ + if (smbus_wait_until_active() < 0) { + return -4; + } /* poll for transaction completion */ if (smbus_wait_until_done() < 0) { |