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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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105 lines
1.9 KiB
C
105 lines
1.9 KiB
C
/*
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* Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2009 PetaLogix
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/of_platform.h>
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#include <asm/prom.h>
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/* Trigger specific functions */
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#ifdef CONFIG_GPIOLIB
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#include <linux/of_gpio.h>
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static int handle; /* reset pin handle */
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static unsigned int reset_val;
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void of_platform_reset_gpio_probe(void)
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{
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int ret;
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handle = of_get_named_gpio(of_find_node_by_path("/"),
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"hard-reset-gpios", 0);
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if (!gpio_is_valid(handle)) {
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pr_info("Skipping unavailable RESET gpio %d (%s)\n",
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handle, "reset");
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return;
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}
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ret = gpio_request(handle, "reset");
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if (ret < 0) {
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pr_info("GPIO pin is already allocated\n");
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return;
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}
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/* get current setup value */
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reset_val = gpio_get_value(handle);
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/* FIXME maybe worth to perform any action */
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pr_debug("Reset: Gpio output state: 0x%x\n", reset_val);
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/* Setup GPIO as output */
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ret = gpio_direction_output(handle, 0);
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if (ret < 0)
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goto err;
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/* Setup output direction */
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gpio_set_value(handle, 0);
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pr_info("RESET: Registered gpio device: %d, current val: %d\n",
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handle, reset_val);
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return;
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err:
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gpio_free(handle);
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return;
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}
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static void gpio_system_reset(void)
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{
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if (gpio_is_valid(handle))
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gpio_set_value(handle, 1 - reset_val);
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else
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pr_notice("Reset GPIO unavailable - halting!\n");
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}
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#else
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#define gpio_system_reset() do {} while (0)
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void of_platform_reset_gpio_probe(void)
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{
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return;
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}
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#endif
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void machine_restart(char *cmd)
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{
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pr_notice("Machine restart...\n");
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gpio_system_reset();
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while (1)
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;
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}
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void machine_shutdown(void)
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{
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pr_notice("Machine shutdown...\n");
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while (1)
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;
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}
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void machine_halt(void)
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{
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pr_notice("Machine halt...\n");
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while (1)
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;
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}
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void machine_power_off(void)
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{
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pr_notice("Machine power off...\n");
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while (1)
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;
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}
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