diff options
author | Felix Held <felix-coreboot@felixheld.de> | 2020-12-01 21:17:17 +0100 |
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committer | Felix Held <felix-coreboot@felixheld.de> | 2020-12-02 21:27:49 +0000 |
commit | 43a5f88bb428080ab6e361ef6bc5e92169ee8452 (patch) | |
tree | 4470595869d80e49daee420998e0dd9eb36b3752 /src/soc/amd/common/block/smbus/smbus_early_fch.c | |
parent | 875e5aa96c8d9e767d24b99015abb66bf7e0ef75 (diff) |
soc/amd: factor out fch_smbus_init
Change-Id: I6df9323dc4e7ca99fd5368f0262e850c0aca5c54
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48218
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Diffstat (limited to 'src/soc/amd/common/block/smbus/smbus_early_fch.c')
-rw-r--r-- | src/soc/amd/common/block/smbus/smbus_early_fch.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/smbus/smbus_early_fch.c b/src/soc/amd/common/block/smbus/smbus_early_fch.c new file mode 100644 index 0000000000..3d04778b24 --- /dev/null +++ b/src/soc/amd/common/block/smbus/smbus_early_fch.c @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <stdint.h> +#include <amdblocks/acpimmio.h> +#include <amdblocks/smbus.h> +#include <soc/southbridge.h> + +void fch_smbus_init(void) +{ + /* 400 kHz smbus speed. */ + const uint8_t smbus_speed = (66000000 / (400000 * 4)); + + pm_write8(SMB_ASF_IO_BASE, SMB_BASE_ADDR >> 8); + smbus_write8(SMBTIMING, smbus_speed); + /* Clear all SMBUS status bits */ + smbus_write8(SMBHSTSTAT, SMBHST_STAT_CLEAR); + smbus_write8(SMBSLVSTAT, SMBSLV_STAT_CLEAR); + asf_write8(SMBHSTSTAT, SMBHST_STAT_CLEAR); + asf_write8(SMBSLVSTAT, SMBSLV_STAT_CLEAR); +} |