bootblock.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <amdblocks/espi.h>
#include <bootblock_common.h>
#include <baseboard/variants.h>
#include <console/console.h>
#include <delay.h>
#include <soc/espi.h>
#include <soc/southbridge.h>
#include <timer.h>
 
#define FC350_PCIE_INIT_DELAY_US (20 * USECS_PER_MSEC)
struct stopwatch pcie_init_timeout_sw;
 
void mb_set_up_early_espi(void)
{
        /*
         * We don't need to initialize all of the GPIOs that are done
         * in bootblock_mainboard_early_init(), but we need to release
         * the EC eSPI reset and do the rest of the configuration.
         *
         * This will not be present in the normal boot flow.
         */
        bootblock_mainboard_early_init();
}
 
void bootblock_mainboard_early_init(void)
{
        size_t num_gpios, override_num_gpios;
        const struct soc_amd_gpio *gpios, *override_gpios;
 
        espi_disable_lpc_ldrq();
 
        /*
         * All LPC decodes need to be cleared before we can configure the LPC pads as secondary
         * eSPI interface that gets used for the EC communication. This is already done by
         * lpc_disable_decodes that gets called before this function.
         */
 
        if (CONFIG(VBOOT_STARTS_BEFORE_BOOTBLOCK))
                return;
 
        gpios = variant_espi_gpio_table(&num_gpios);
        gpio_configure_pads(gpios, num_gpios);
 
        gpios = variant_tpm_gpio_table(&num_gpios);
        gpio_configure_pads(gpios, num_gpios);
 
        gpios = variant_early_gpio_table(&num_gpios);
        override_gpios = variant_early_override_gpio_table(&override_num_gpios);
        gpio_configure_pads_with_override(gpios, num_gpios, override_gpios, override_num_gpios);
 
        /* Set a timer to make sure there's enough delay for
         * the Fibocom 350 PCIe init
         */
        stopwatch_init_usecs_expire(&pcie_init_timeout_sw, FC350_PCIE_INIT_DELAY_US);
 
        /* Early eSPI interface configuration */
 
        espi_switch_to_spi2_pads();
}
 
void bootblock_mainboard_init(void)
{
        size_t base_num_gpios, override_num_gpios;
        const struct soc_amd_gpio *base_gpios, *override_gpios;
        int i = 0;
 
        /* Make sure that at least 20ms has elapsed since enabling WWAN power
         * in bootblock_mainboard_early_init.
         * This is only applicable if verstage is not in the PSP and the board
         * is using the fibocom 350 WLAN card, so this typically will not be hit.
         */
        if (!CONFIG(VBOOT_STARTS_BEFORE_BOOTBLOCK) && variant_has_pcie_wwan()) {
                while (!stopwatch_expired(&pcie_init_timeout_sw)) {
                        mdelay(1);
                        i++;
                };
                if (i)
                        printk(BIOS_DEBUG, "Delayed %d ms for PCIe\n", i);
        }
 
        base_gpios = variant_bootblock_gpio_table(&base_num_gpios);
        override_gpios = variant_bootblock_override_gpio_table(&override_num_gpios);
 
        gpio_configure_pads_with_override(base_gpios, base_num_gpios, override_gpios,
                                          override_num_gpios);
}