diff options
| author | arch import user (historical) <svn@openbios.org> | 2005-07-06 17:17:25 +0000 |
|---|---|---|
| committer | arch import user (historical) <svn@openbios.org> | 2005-07-06 17:17:25 +0000 |
| commit | 6ca7636c8f52560e732cdd5b1c7829cda5aa2bde (patch) | |
| tree | cc45ae7c4dea6e2c5338f52b4314106bf07023be /src/southbridge | |
| parent | b2ed53dd5669c2c3839633bd2b3b4af709a5b149 (diff) | |
Revision: linuxbios@linuxbios.org--devel/freebios--devel--2.0--patch-51
Creator: Yinghai Lu <yhlu@tyan.com>
cache_as_ram for AMD and some intel
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1967 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/southbridge')
| -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) { |