romstage_spd_smbus.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <baseboard/variants.h>
#include <console/console.h>
#include <soc/cnl_memcfg_init.h>
#include <soc/romstage.h>
#include <spd_bin.h>
#include <spd_cache.h>
 
void mainboard_memory_init_params(FSPM_UPD *memupd)
{
        struct cnl_mb_cfg memcfg;
        variant_memory_params(&memcfg);
 
        /* Read spd block to get memory config */
        struct spd_block blk = {
                .addr_map = { 0x50, 0x52, },
        };
 
        uint8_t *spd_cache;
        size_t spd_cache_sz;
        bool need_update_cache = false;
        bool dimm_changed = true;
 
        /* load spd cache from RW_SPD_CACHE */
        if (load_spd_cache(&spd_cache, &spd_cache_sz) == CB_SUCCESS) {
                if (!spd_cache_is_valid(spd_cache, spd_cache_sz)) {
                        printk(BIOS_WARNING, "Invalid SPD cache\n");
                } else {
                        dimm_changed = check_if_dimm_changed(spd_cache, &blk);
                        if (dimm_changed && memupd->FspmArchUpd.NvsBufferPtr != 0) {
                                /* Set mrc_cache as invalid */
                                printk(BIOS_INFO, "Set mrc_cache as invalid\n");
                                memupd->FspmArchUpd.NvsBufferPtr = 0;
                        }
                }
                need_update_cache = true;
        }
 
        if (!dimm_changed) {
                spd_fill_from_cache(spd_cache, &blk);
        } else {
                /* Access memory info through SMBUS. */
                get_spd_smbus(&blk);
 
                if (need_update_cache && update_spd_cache(&blk) == CB_ERR)
                        printk(BIOS_WARNING, "update SPD cache failed\n");
        }
 
        if (blk.spd_array[0] == NULL) {
                memcfg.spd[0].read_type = NOT_EXISTING;
        } else {
                memcfg.spd[0].read_type = READ_SPD_MEMPTR;
                memcfg.spd[0].spd_spec.spd_data_ptr_info.spd_data_len = blk.len;
                memcfg.spd[0].spd_spec.spd_data_ptr_info.spd_data_ptr = (uintptr_t)blk.spd_array[0];
        }
 
        memcfg.spd[1].read_type = NOT_EXISTING;
 
        if (blk.spd_array[1] == NULL) {
                memcfg.spd[2].read_type = NOT_EXISTING;
        } else {
                memcfg.spd[2].read_type = READ_SPD_MEMPTR;
                memcfg.spd[2].spd_spec.spd_data_ptr_info.spd_data_len = blk.len;
                memcfg.spd[2].spd_spec.spd_data_ptr_info.spd_data_ptr = (uintptr_t)blk.spd_array[1];
        }
 
        memcfg.spd[3].read_type = NOT_EXISTING;
        dump_spd_info(&blk);
 
        /* set to 2 VREF_CA goes to CH_A and VREF_DQ_B goes to CH_B. */
        memcfg.vref_ca_config = 2;
        memcfg.dq_pins_interleaved = 1;
 
        cannonlake_memcfg_init(&memupd->FspmConfig, &memcfg);
}