gpio.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <soc/car.h>
#include <soc/ramstage.h>
#include "reg_access.h"
#include "gen1.h"
#include "gen2.h"
 
void car_mainboard_pre_console_init(void)
{
        const struct reg_script *script;
 
        /* Initialize the GPIO controllers */
        if (CONFIG(GALILEO_GEN2))
                script = gen2_gpio_init;
        else
                script = gen1_gpio_init;
        reg_script_run(script);
 
        /* Initialize the RXD and TXD paths for UART0 */
        if (CONFIG(ENABLE_BUILTIN_HSUART0)) {
                if (CONFIG(GALILEO_GEN2))
                        script = gen2_hsuart0;
                else
                        script = (reg_legacy_gpio_read(
                                R_QNC_GPIO_RGLVL_RESUME_WELL)
                                & GALILEO_DETERMINE_IOEXP_SLA_RESUMEWELL_GPIO)
                                ? gen1_hsuart0_0x20 : gen1_hsuart0_0x21;
                reg_script_run(script);
        }
}
 
void mainboard_gpio_i2c_init(struct device *dev)
{
        const struct reg_script *script;
 
        printk(BIOS_INFO, "Galileo I2C chip initialization\n");
 
        /* Determine the correct script for the board */
        if (CONFIG(GALILEO_GEN2))
                script = gen2_i2c_init;
        else
                /* Determine which I2C address is in use */
                script = (reg_legacy_gpio_read(R_QNC_GPIO_RGLVL_RESUME_WELL)
                        & GALILEO_DETERMINE_IOEXP_SLA_RESUMEWELL_GPIO)
                        ? gen1_i2c_0x20_init : gen1_i2c_0x21_init;
 
        /* Initialize the I2C chips */
        reg_script_run(script);
}
 
void mainboard_gpio_pcie_reset(uint32_t pin_value)
{
        uint32_t pin_number;
        uint32_t value;
 
        /* Determine the correct PCIe reset pin */
        if (CONFIG(GALILEO_GEN2))
                pin_number = GEN2_PCI_RESET_RESUMEWELL_GPIO;
        else
                pin_number = GEN1_PCI_RESET_RESUMEWELL_GPIO;
 
        /* Update the PCIe reset value */
        value = reg_legacy_gpio_read(R_QNC_GPIO_RGLVL_RESUME_WELL);
        value = (value & ~(1 << pin_number)) | ((pin_value & 1) << pin_number);
        reg_legacy_gpio_write(R_QNC_GPIO_RGLVL_RESUME_WELL, value);
}