memory.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <assert.h>
#include <baseboard/variants.h>
 
#define SAMSUNG_C_DIE_2G        10
#define SAMSUNG_C_DIE_4G        11
/* DQ byte map */
static const u8 dq_map[][12] = {
        { 0x0F, 0xF0, 0x00, 0xF0, 0x0F, 0xF0,
          0x0F, 0x00, 0xFF, 0x00, 0xFF, 0x00 },
        { 0x33, 0xCC, 0x00, 0xCC, 0x33, 0xCC,
          0x33, 0x00, 0xFF, 0x00, 0xFF, 0x00 }
};
 
/* DQS CPU<>DRAM map */
static const u8 dqs_map[][8] = {
        { 0, 1, 3, 2, 4, 5, 6, 7 },
        { 3, 2, 6, 7, 0, 1, 4, 5 },
};
 
/* Rcomp resistor */
static const u16 rcomp_resistor[] = { 200, 81, 162 };
 
/* Rcomp target */
static const u16 rcomp_target[] = { 100, 40, 40, 23, 40 };
static const u16 rcomp_target_samsung_c_die[] = { 100, 40, 35, 18, 40 };
 
void variant_memory_params(struct memory_params *p)
{
        int spd_index;
 
        p->type = MEMORY_LPDDR3;
        p->dq_map = dq_map;
        p->dq_map_size = sizeof(dq_map);
        p->dqs_map = dqs_map;
        p->dqs_map_size = sizeof(dqs_map);
        p->rcomp_resistor = rcomp_resistor;
        p->rcomp_resistor_size = sizeof(rcomp_resistor);
        spd_index = variant_memory_sku();
        assert(spd_index >= 0);
        if (spd_index == SAMSUNG_C_DIE_2G || spd_index == SAMSUNG_C_DIE_4G)
                p->rcomp_target = rcomp_target_samsung_c_die;
        else
                p->rcomp_target = rcomp_target;
        p->rcomp_target_size = sizeof(rcomp_target);
}