mainboard.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <string.h>
#include <baseboard/variants.h>
#include <ec/google/chromeec/ec.h>
#include <drivers/vpd/vpd.h>
#include <soc/cpu.h>
#include <soc/intel/apollolake/chip.h>
 
/* SKU ID enumeration */
enum snappy_sku {
        SKU_UNKNOWN = -1,
        SKU_RESERVED0,
        SKU_RESERVED1,
        SKU_BIGDADDY_KBDBKLIGHT,
        SKU_RESERVED3,
        SKU_RESERVED4,
        SKU_BIGDADDY,
        SKU_RESERVED6,
        SKU_ALAN,
        SKU_SNAPPY,
};
 
void variant_board_ec_set_skuid(void)
{
        google_chromeec_set_sku_id(variant_board_sku());
}
 
/*
 * override SKU ID by VPD definition
 */
uint8_t variant_board_sku(void)
{
        static int board_sku_num = -1;
        int vpd_sku_num;
        char vpd_skuid[] = "skuid";
        char vpd_buffer[4];
        int vpd_len;
        int i;
 
        if (board_sku_num != -1)
                return board_sku_num;
 
        board_sku_num = sku_strapping_value();
 
        if (!CONFIG(CHROMEOS))
                return board_sku_num;
 
        if (!vpd_gets(vpd_skuid, vpd_buffer, ARRAY_SIZE(vpd_buffer), VPD_RO_THEN_RW))
                return board_sku_num;
 
        vpd_len = strlen(vpd_buffer);
 
        vpd_sku_num = 0;
        for (i = 0; i < vpd_len; i++) {
                char ch = vpd_buffer[i];
                if ((ch < '0') || (ch > '9')) {
                        vpd_sku_num = -1;
                        break;
                }
                vpd_sku_num = vpd_sku_num * 10 + (ch - '0');
        }
 
        if (vpd_sku_num != -1)
                board_sku_num = vpd_sku_num;
 
        return board_sku_num;
}
 
void mainboard_devtree_update(struct device *dev)
{
        /* Override dev tree settings per board */
        struct soc_intel_apollolake_config *cfg = dev->chip_info;
        uint8_t sku_id;
 
        sku_id = variant_board_sku();
 
        switch (sku_id) {
        case SKU_ALAN:
                cfg->usb2eye[2].Usb20PerPortPeTxiSet = 4;
                cfg->usb2eye[2].Usb20PerPortTxiSet = 4;
                cfg->usb2eye[2].Usb20IUsbTxEmphasisEn = 1;
                cfg->usb2eye[2].Usb20PerPortTxPeHalf = 0;
 
                cfg->usb2eye[4].Usb20PerPortPeTxiSet = 7;
                cfg->usb2eye[4].Usb20PerPortTxiSet = 7;
                cfg->usb2eye[4].Usb20IUsbTxEmphasisEn = 1;
                cfg->usb2eye[4].Usb20PerPortTxPeHalf = 0;
                break;
        case SKU_BIGDADDY_KBDBKLIGHT:
        case SKU_BIGDADDY:
                cfg->usb2eye[1].Usb20PerPortPeTxiSet = 7;
                cfg->usb2eye[1].Usb20PerPortTxiSet = 1;
                cfg->usb2eye[1].Usb20IUsbTxEmphasisEn = 3;
                cfg->usb2eye[1].Usb20PerPortTxPeHalf = 0;
 
                cfg->usb2eye[2].Usb20PerPortPeTxiSet = 4;
                cfg->usb2eye[2].Usb20PerPortTxiSet = 4;
                cfg->usb2eye[2].Usb20IUsbTxEmphasisEn = 1;
                cfg->usb2eye[2].Usb20PerPortTxPeHalf = 0;
 
                cfg->usb2eye[4].Usb20PerPortPeTxiSet = 7;
                cfg->usb2eye[4].Usb20PerPortTxiSet = 7;
                cfg->usb2eye[4].Usb20IUsbTxEmphasisEn = 1;
                cfg->usb2eye[4].Usb20PerPortTxPeHalf = 0;
                break;
        default:
                break;
        }
}