gpio.c

Go to the documentation of this file.

/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <acpi/acpigen.h>
#include <console/console.h>
#include <soc/gpio.h>
 
static int acpigen_soc_gpio_op(const char *op, unsigned int gpio_num)
{
        if (gpio_num >= SOC_GPIO_TOTAL_PINS) {
                printk(BIOS_WARNING, "Pin %d should be smaller than"
                                        " %d\n", gpio_num, SOC_GPIO_TOTAL_PINS);
                return -1;
        }
        if (SOC_GPIO_TOTAL_PINS >= AMD_GPIO_FIRST_REMOTE_GPIO_NUMBER &&
                        gpio_num >= SOC_GPIO_TOTAL_PINS) {
                printk(BIOS_WARNING, "Pin %d is a remote GPIO which isn't supported"
                        " yet.\n", gpio_num);
                return -1;
        }
        /* op (gpio_num) */
        acpigen_emit_namestring(op);
        acpigen_write_integer(gpio_num);
        return 0;
}
 
static int acpigen_soc_get_gpio_state(const char *op, unsigned int gpio_num)
{
        if (gpio_num >= SOC_GPIO_TOTAL_PINS) {
                printk(BIOS_WARNING, "Pin %d should be smaller than"
                                        " %d\n", gpio_num, SOC_GPIO_TOTAL_PINS);
                return -1;
        }
        if (SOC_GPIO_TOTAL_PINS >= AMD_GPIO_FIRST_REMOTE_GPIO_NUMBER &&
                        gpio_num >= SOC_GPIO_TOTAL_PINS) {
                printk(BIOS_WARNING, "Pin %d is a remote GPIO which isn't supported"
                        " yet.\n", gpio_num);
                return -1;
        }
        /* Store (op (gpio_num), Local0) */
        acpigen_write_store();
        acpigen_soc_gpio_op(op, gpio_num);
        acpigen_emit_byte(LOCAL0_OP);
        return 0;
}
 
int acpigen_soc_read_rx_gpio(unsigned int gpio_num)
{
        return acpigen_soc_get_gpio_state("\\_SB.GRXS", gpio_num);
}
 
int acpigen_soc_get_tx_gpio(unsigned int gpio_num)
{
        return acpigen_soc_get_gpio_state("\\_SB.GTXS", gpio_num);
}
 
int acpigen_soc_set_tx_gpio(unsigned int gpio_num)
{
        return acpigen_soc_gpio_op("\\_SB.STXS", gpio_num);
}
 
int acpigen_soc_clear_tx_gpio(unsigned int gpio_num)
{
        return acpigen_soc_gpio_op("\\_SB.CTXS", gpio_num);
}