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f0e5bd412f
This patch adds support for the ux500_wdt watchdog that is found in ST-Ericsson Ux500 platform. The driver is based on PRCMU APIs. Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Wim Van Sebroeck <wim@iguana.be> Signed-off-by: Fabio Baltieri <fabio.baltieri@linaro.org> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
172 lines
4.1 KiB
C
172 lines
4.1 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2011-2013
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*
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* License Terms: GNU General Public License v2
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*
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* Author: Mathieu Poirier <mathieu.poirier@linaro.org> for ST-Ericsson
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* Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/moduleparam.h>
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#include <linux/miscdevice.h>
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#include <linux/err.h>
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#include <linux/uaccess.h>
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#include <linux/watchdog.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/ux500_wdt.h>
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#include <linux/mfd/dbx500-prcmu.h>
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#define WATCHDOG_TIMEOUT 600 /* 10 minutes */
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#define WATCHDOG_MIN 0
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#define WATCHDOG_MAX28 268435 /* 28 bit resolution in ms == 268435.455 s */
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#define WATCHDOG_MAX32 4294967 /* 32 bit resolution in ms == 4294967.295 s */
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static unsigned int timeout = WATCHDOG_TIMEOUT;
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module_param(timeout, uint, 0);
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MODULE_PARM_DESC(timeout,
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"Watchdog timeout in seconds. default="
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__MODULE_STRING(WATCHDOG_TIMEOUT) ".");
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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static int ux500_wdt_start(struct watchdog_device *wdd)
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{
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return prcmu_enable_a9wdog(PRCMU_WDOG_ALL);
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}
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static int ux500_wdt_stop(struct watchdog_device *wdd)
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{
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return prcmu_disable_a9wdog(PRCMU_WDOG_ALL);
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}
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static int ux500_wdt_keepalive(struct watchdog_device *wdd)
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{
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return prcmu_kick_a9wdog(PRCMU_WDOG_ALL);
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}
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static int ux500_wdt_set_timeout(struct watchdog_device *wdd,
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unsigned int timeout)
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{
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ux500_wdt_stop(wdd);
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prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
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ux500_wdt_start(wdd);
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return 0;
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}
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static const struct watchdog_info ux500_wdt_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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.identity = "Ux500 WDT",
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.firmware_version = 1,
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};
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static const struct watchdog_ops ux500_wdt_ops = {
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.owner = THIS_MODULE,
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.start = ux500_wdt_start,
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.stop = ux500_wdt_stop,
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.ping = ux500_wdt_keepalive,
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.set_timeout = ux500_wdt_set_timeout,
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};
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static struct watchdog_device ux500_wdt = {
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.info = &ux500_wdt_info,
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.ops = &ux500_wdt_ops,
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.min_timeout = WATCHDOG_MIN,
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.max_timeout = WATCHDOG_MAX32,
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};
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static int ux500_wdt_probe(struct platform_device *pdev)
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{
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int ret;
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struct ux500_wdt_data *pdata = pdev->dev.platform_data;
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if (pdata) {
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if (pdata->timeout > 0)
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timeout = pdata->timeout;
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if (pdata->has_28_bits_resolution)
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ux500_wdt.max_timeout = WATCHDOG_MAX28;
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}
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watchdog_set_nowayout(&ux500_wdt, nowayout);
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/* disable auto off on sleep */
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prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false);
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/* set HW initial value */
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prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
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ret = watchdog_register_device(&ux500_wdt);
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if (ret)
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return ret;
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dev_info(&pdev->dev, "initialized\n");
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return 0;
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}
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static int ux500_wdt_remove(struct platform_device *dev)
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{
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watchdog_unregister_device(&ux500_wdt);
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return 0;
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}
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#ifdef CONFIG_PM
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static int ux500_wdt_suspend(struct platform_device *pdev,
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pm_message_t state)
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{
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if (watchdog_active(&ux500_wdt)) {
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ux500_wdt_stop(&ux500_wdt);
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prcmu_config_a9wdog(PRCMU_WDOG_CPU1, true);
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prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
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ux500_wdt_start(&ux500_wdt);
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}
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return 0;
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}
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static int ux500_wdt_resume(struct platform_device *pdev)
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{
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if (watchdog_active(&ux500_wdt)) {
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ux500_wdt_stop(&ux500_wdt);
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prcmu_config_a9wdog(PRCMU_WDOG_CPU1, false);
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prcmu_load_a9wdog(PRCMU_WDOG_ALL, timeout * 1000);
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ux500_wdt_start(&ux500_wdt);
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}
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return 0;
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}
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#else
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#define ux500_wdt_suspend NULL
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#define ux500_wdt_resume NULL
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#endif
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static struct platform_driver ux500_wdt_driver = {
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.probe = ux500_wdt_probe,
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.remove = ux500_wdt_remove,
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.suspend = ux500_wdt_suspend,
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.resume = ux500_wdt_resume,
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.driver = {
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.owner = THIS_MODULE,
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.name = "ux500_wdt",
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},
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};
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module_platform_driver(ux500_wdt_driver);
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MODULE_AUTHOR("Jonas Aaberg <jonas.aberg@stericsson.com>");
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MODULE_DESCRIPTION("Ux500 Watchdog Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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MODULE_ALIAS("platform:ux500_wdt");
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