memory.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <baseboard/variants.h>
#include <baseboard/gpio.h>
#include <boardid.h>
#include <gpio.h>
#include <soc/cnl_memcfg_init.h>
#include <string.h>
#include <variant/gpio.h>
 
static const struct cnl_mb_cfg baseboard_memcfg = {
        /*
         * The dqs_map arrays map the SoC pins to the lpddr3 pins
         * for both channels.
         *
         * "The index of the array is CPU byte number, the values are DRAM byte
         * numbers." - doc #573387
         *
         * the index = pin number on SoC
         * the value = pin number on lpddr3 part
         */
        .dqs_map[DDR_CH0] = {4, 7, 5, 6, 0, 3, 2, 1},
        .dqs_map[DDR_CH1] = {0, 3, 2, 1, 4, 7, 6, 5},
 
        .dq_map[DDR_CH0] = {
                {0xf0, 0xf},
                {0x0, 0xf},
                {0xf0, 0xf},
                {0xf0, 0x0},
                {0xff, 0x0},
                {0xff, 0x0}
        },
        .dq_map[DDR_CH1] = {
                {0xf, 0xf0},
                {0x0, 0xf0},
                {0xf, 0xf0},
                {0xf, 0x0},
                {0xff, 0x0},
                {0xff, 0x0}
        },
 
        /* Helios uses 200, 80.6 and 162 rcomp resistors */
        .rcomp_resistor = {200, 81, 162},
 
        /* Helios Rcomp target values */
        .rcomp_targets = {100, 40, 40, 23, 40},
 
        /* Set CaVref config to 0 for LPDDR3 */
        .vref_ca_config = 0,
 
        /* Disable Early Command Training */
        .ect = 0,
};
 
void variant_memory_params(struct cnl_mb_cfg *bcfg)
{
        memcpy(bcfg, &baseboard_memcfg, sizeof(baseboard_memcfg));
}
 
int variant_memory_sku(void)
{
        const gpio_t spd_gpios[] = {
                GPIO_MEM_CONFIG_0,
                GPIO_MEM_CONFIG_1,
                GPIO_MEM_CONFIG_2,
                GPIO_MEM_CONFIG_3,
        };
 
        int val = gpio_base2_value(spd_gpios, ARRAY_SIZE(spd_gpios));
 
        if ((board_id() != 0) && (board_id() != BOARD_ID_UNKNOWN))
                return val;
 
        /*
         * For boards with id 0 or unknown, memory straps 3 and 4 are
         * incorrectly stuffed in hardware. This is a workaround for these
         * boards to override memory strap 3 to 0 and 4 to 1.
         */
        switch (val) {
        case 3:
                val = 0;
                break;
        case 4:
                val = 1;
                break;
        }
 
        return val;
}