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include/spd_bin.h: Add SPD IO layer

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By default, PCH SMBus codes will be called to retrieve SPD data. This
patch adds a SPD IO layer so that SoC could implement its specific SPD
IO layer functions such as using Integrated Memory Controller to get
SPD data.

Change-Id: I656298aeda409fca3c85266b5b8727fac9bfc917
Signed-off-by: Yuchi Chen <yuchi.chen@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84201
Reviewed-by: Shuo Liu <shuo.liu@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Yuchi Chen 2024-09-03 22:58:00 +08:00 • committed by Lean Sheng Tan
commit 7a7b4f05fc
4 changed files with 40 additions and 15 deletions
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4
src/include/spd_bin.h
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@ -49,6 +49,10 @@ uintptr_t spd_cbfs_map(u8 spd_index);
void dump_spd_info(struct spd_block *blk);
void get_spd_smbus(struct spd_block *blk);
int spd_read_byte(u8 slave_addr, u8 bus_addr);
int spd_read_word(u8 slave_addr, u8 bus_addr);
void spd_write_byte(u8 slave_addr, u8 bus_addr, u8 value);
/*
* get_spd_sn returns the SODIMM serial number. It only supports DDR3 and DDR4.
* return CB_SUCCESS, sn is the serial number and sn=0xffffffff if the dimm is not present.