From 43a5f88bb428080ab6e361ef6bc5e92169ee8452 Mon Sep 17 00:00:00 2001 From: Felix Held Date: Tue, 1 Dec 2020 21:17:17 +0100 Subject: soc/amd: factor out fch_smbus_init Change-Id: I6df9323dc4e7ca99fd5368f0262e850c0aca5c54 Signed-off-by: Felix Held Reviewed-on: https://review.coreboot.org/c/coreboot/+/48218 Tested-by: build bot (Jenkins) Reviewed-by: Marshall Dawson --- src/soc/amd/common/block/smbus/Makefile.inc | 1 + src/soc/amd/common/block/smbus/smbus_early_fch.c | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+) create mode 100644 src/soc/amd/common/block/smbus/smbus_early_fch.c (limited to 'src/soc/amd/common/block/smbus') diff --git a/src/soc/amd/common/block/smbus/Makefile.inc b/src/soc/amd/common/block/smbus/Makefile.inc index b9c7f2a51f..867465efd4 100644 --- a/src/soc/amd/common/block/smbus/Makefile.inc +++ b/src/soc/amd/common/block/smbus/Makefile.inc @@ -1,5 +1,6 @@ ifeq ($(CONFIG_SOC_AMD_COMMON_BLOCK_SMBUS),y) +bootblock-y += smbus_early_fch.c romstage-y += smbus.c ramstage-y += smbus.c ramstage-y += sm.c 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 +#include +#include +#include + +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); +} -- cgit v1.2.3