141 lines
2.8 KiB
C
141 lines
2.8 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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static int of_reset_gpio_handle(void)
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{
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int ret; /* variable which stored handle reset gpio pin */
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struct device_node *root; /* root node */
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struct device_node *gpio; /* gpio node */
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struct of_gpio_chip *of_gc = NULL;
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enum of_gpio_flags flags ;
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const void *gpio_spec;
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/* find out root node */
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root = of_find_node_by_path("/");
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/* give me handle for gpio node to be possible allocate pin */
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ret = of_parse_phandles_with_args(root, "hard-reset-gpios",
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"#gpio-cells", 0, &gpio, &gpio_spec);
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if (ret) {
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pr_debug("%s: can't parse gpios property\n", __func__);
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goto err0;
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}
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of_gc = gpio->data;
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if (!of_gc) {
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pr_debug("%s: gpio controller %s isn't registered\n",
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root->full_name, gpio->full_name);
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ret = -ENODEV;
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goto err1;
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}
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ret = of_gc->xlate(of_gc, root, gpio_spec, &flags);
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if (ret < 0)
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goto err1;
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ret += of_gc->gc.base;
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err1:
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of_node_put(gpio);
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err0:
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pr_debug("%s exited with status %d\n", __func__, ret);
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return ret;
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}
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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_reset_gpio_handle();
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if (!gpio_is_valid(handle)) {
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printk(KERN_INFO "Skipping unavailable RESET gpio %d (%s)\n",
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handle, "reset");
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}
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ret = gpio_request(handle, "reset");
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if (ret < 0) {
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printk(KERN_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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printk(KERN_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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gpio_set_value(handle, 1 - reset_val);
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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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printk(KERN_NOTICE "Machine restart...\n");
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gpio_system_reset();
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dump_stack();
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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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printk(KERN_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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printk(KERN_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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printk(KERN_NOTICE "Machine power off...\n");
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while (1)
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;
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}
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