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| author | Florian Zumbiehl <florz@florz.de> | 2011-11-01 20:17:13 +0100 |
|---|---|---|
| committer | Rudolf Marek <r.marek@assembler.cz> | 2011-11-03 21:39:03 +0100 |
| commit | e037f9f17473b0bd21b8ca63b1cb9479652f3b6b (patch) | |
| tree | c11afa6b40eab4625fd6d7818051e107836ed5f2 /src/southbridge/via | |
| parent | 8c4cf18fc48baa15388e12efa1d2b8da685df7b8 (diff) | |
| download | coreboot-e037f9f17473b0bd21b8ca63b1cb9479652f3b6b.tar.xz | |
add support for writing to SMBus with vt8237
Change-Id: I70fe072f8f3447d0be7b7ac64508a954fe47091d
Signed-off-by: Florian Zumbiehl <florz@florz.de>
Reviewed-on: http://review.coreboot.org/372
Tested-by: build bot (Jenkins)
Reviewed-by: Rudolf Marek <r.marek@assembler.cz>
Diffstat (limited to 'src/southbridge/via')
| -rw-r--r-- | src/southbridge/via/vt8237r/early_smbus.c | 31 | ||||
| -rw-r--r-- | src/southbridge/via/vt8237r/vt8237r.h | 1 |
2 files changed, 22 insertions, 10 deletions
diff --git a/src/southbridge/via/vt8237r/early_smbus.c b/src/southbridge/via/vt8237r/early_smbus.c index a298e84676..e25535bf0f 100644 --- a/src/southbridge/via/vt8237r/early_smbus.c +++ b/src/southbridge/via/vt8237r/early_smbus.c @@ -87,17 +87,12 @@ static void smbus_reset(void) PRINT_DEBUG("\n"); } -/** - * Read a byte from the SMBus. - * - * @param dimm The address location of the DIMM on the SMBus. - * @param offset The offset the data is located at. - */ -u8 smbus_read_byte(u8 dimm, u8 offset) +static u8 smbus_transaction(u8 dimm, u8 offset, u8 data, int do_read) { u8 val; - PRINT_DEBUG("DIMM "); + PRINT_DEBUG(do_read ? "RD: " : "WR: "); + PRINT_DEBUG("ADDR "); PRINT_DEBUG_HEX16(dimm); PRINT_DEBUG(" OFFSET "); PRINT_DEBUG_HEX16(offset); @@ -106,13 +101,13 @@ u8 smbus_read_byte(u8 dimm, u8 offset) smbus_reset(); /* Clear host data port. */ - outb(0x00, SMBHSTDAT0); + outb(do_read ? 0x00 : data, SMBHSTDAT0); SMBUS_DELAY(); smbus_wait_until_ready(); /* Actual addr to reg format. */ dimm = (dimm << 1); - dimm |= 1; + dimm |= !!do_read; outb(dimm, SMBXMITADD); outb(offset, SMBHSTCMD); @@ -132,6 +127,22 @@ u8 smbus_read_byte(u8 dimm, u8 offset) return val; } +/** + * Read a byte from the SMBus. + * + * @param dimm The address location of the DIMM on the SMBus. + * @param offset The offset the data is located at. + */ +u8 smbus_read_byte(u8 dimm, u8 offset) +{ + return smbus_transaction(dimm, offset, 0, 1); +} + +void smbus_write_byte(u8 dimm, u8 offset, u8 data) +{ + smbus_transaction(dimm, offset, data, 0); +} + #define PSONREADY_TIMEOUT 0x7fffffff static device_t get_vt8237_lpc(void) diff --git a/src/southbridge/via/vt8237r/vt8237r.h b/src/southbridge/via/vt8237r/vt8237r.h index 94b1840361..9d5a1fc608 100644 --- a/src/southbridge/via/vt8237r/vt8237r.h +++ b/src/southbridge/via/vt8237r/vt8237r.h @@ -148,6 +148,7 @@ __attribute__ ((packed)) #ifdef __PRE_RAM__ #ifndef __ROMCC__ u8 smbus_read_byte(u8 dimm, u8 offset); +void smbus_write_byte(u8 dimm, u8 offset, u8 data); void enable_smbus(void); void smbus_fixup(const struct mem_controller *ctrl); // these are in vt8237_early_smbus.c - do they really belong there? |