142 lines
3.5 KiB
C
142 lines
3.5 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Copyright (C) 2012 ARM Limited
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*/
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#include <linux/jiffies.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/stat.h>
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#include <linux/vexpress.h>
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static void vexpress_reset_do(struct device *dev, const char *what)
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{
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int err = -ENOENT;
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struct vexpress_config_func *func =
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vexpress_config_func_get_by_dev(dev);
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if (func) {
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unsigned long timeout;
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err = vexpress_config_write(func, 0, 0);
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timeout = jiffies + HZ;
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while (time_before(jiffies, timeout))
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cpu_relax();
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}
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dev_emerg(dev, "Unable to %s (%d)\n", what, err);
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}
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static struct device *vexpress_power_off_device;
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void vexpress_power_off(void)
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{
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vexpress_reset_do(vexpress_power_off_device, "power off");
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}
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static struct device *vexpress_restart_device;
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void vexpress_restart(char str, const char *cmd)
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{
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vexpress_reset_do(vexpress_restart_device, "restart");
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}
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static ssize_t vexpress_reset_active_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", vexpress_restart_device == dev);
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}
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static ssize_t vexpress_reset_active_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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long value;
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int err = kstrtol(buf, 0, &value);
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if (!err && value)
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vexpress_restart_device = dev;
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return err ? err : count;
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}
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DEVICE_ATTR(active, S_IRUGO | S_IWUSR, vexpress_reset_active_show,
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vexpress_reset_active_store);
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enum vexpress_reset_func { FUNC_RESET, FUNC_SHUTDOWN, FUNC_REBOOT };
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static struct of_device_id vexpress_reset_of_match[] = {
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{
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.compatible = "arm,vexpress-reset",
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.data = (void *)FUNC_RESET,
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}, {
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.compatible = "arm,vexpress-shutdown",
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.data = (void *)FUNC_SHUTDOWN
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}, {
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.compatible = "arm,vexpress-reboot",
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.data = (void *)FUNC_REBOOT
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},
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{}
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};
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static int vexpress_reset_probe(struct platform_device *pdev)
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{
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enum vexpress_reset_func func;
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const struct of_device_id *match =
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of_match_device(vexpress_reset_of_match, &pdev->dev);
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if (match)
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func = (enum vexpress_reset_func)match->data;
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else
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func = pdev->id_entry->driver_data;
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switch (func) {
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case FUNC_SHUTDOWN:
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vexpress_power_off_device = &pdev->dev;
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break;
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case FUNC_RESET:
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if (!vexpress_restart_device)
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vexpress_restart_device = &pdev->dev;
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device_create_file(&pdev->dev, &dev_attr_active);
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break;
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case FUNC_REBOOT:
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vexpress_restart_device = &pdev->dev;
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device_create_file(&pdev->dev, &dev_attr_active);
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break;
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};
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return 0;
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}
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static const struct platform_device_id vexpress_reset_id_table[] = {
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{ .name = "vexpress-reset", .driver_data = FUNC_RESET, },
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{ .name = "vexpress-shutdown", .driver_data = FUNC_SHUTDOWN, },
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{ .name = "vexpress-reboot", .driver_data = FUNC_REBOOT, },
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{}
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};
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static struct platform_driver vexpress_reset_driver = {
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.probe = vexpress_reset_probe,
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.driver = {
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.name = "vexpress-reset",
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.of_match_table = vexpress_reset_of_match,
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},
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.id_table = vexpress_reset_id_table,
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};
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static int __init vexpress_reset_init(void)
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{
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return platform_driver_register(&vexpress_reset_driver);
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}
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device_initcall(vexpress_reset_init);
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