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* Watchdog driver for IMX2 and later processors
*
* Copyright (C) 2010 Wolfram Sang, Pengutronix e.K. <w.sang@pengutronix.de>
* Copyright (C) 2014 Freescale Semiconductor, Inc.
*
* some parts adapted by similar drivers from Darius Augulis and Vladimir
* Zapolskiy, additional improvements by Wim Van Sebroeck.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* NOTE: MX1 has a slightly different Watchdog than MX2 and later:
*
* MX1: MX2+:
* ---- -----
* Registers: 32-bit 16-bit
* Stopable timer: Yes No
* Need to enable clk: No Yes
* Halt on suspend: Manual Can be automatic
*/
#include <linux/clk.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/timer.h>
#include <linux/watchdog.h>
#define DRIVER_NAME "imx2-wdt"
#define IMX2_WDT_WCR 0x00 /* Control Register */
#define IMX2_WDT_WCR_WT (0xFF << 8) /* -> Watchdog Timeout Field */
#define IMX2_WDT_WCR_WRE (1 << 3) /* -> WDOG Reset Enable */
#define IMX2_WDT_WCR_WDE (1 << 2) /* -> Watchdog Enable */
#define IMX2_WDT_WCR_WDZST (1 << 0) /* -> Watchdog timer Suspend */
#define IMX2_WDT_WSR 0x02 /* Service Register */
#define IMX2_WDT_SEQ1 0x5555 /* -> service sequence 1 */
#define IMX2_WDT_SEQ2 0xAAAA /* -> service sequence 2 */
#define IMX2_WDT_WRSR 0x04 /* Reset Status Register */
#define IMX2_WDT_WRSR_TOUT (1 << 1) /* -> Reset due to Timeout */
#define IMX2_WDT_MAX_TIME 128
#define IMX2_WDT_DEFAULT_TIME 60 /* in seconds */
#define WDOG_SEC_TO_COUNT(s) ((s * 2 - 1) << 8)
struct imx2_wdt_device {
struct clk *clk;
struct regmap *regmap;
struct timer_list timer; /* Pings the watchdog when closed */
struct watchdog_device wdog;
};
static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
static unsigned timeout = IMX2_WDT_DEFAULT_TIME;
module_param(timeout, uint, 0);
MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds (default="
__MODULE_STRING(IMX2_WDT_DEFAULT_TIME) ")");
static const struct watchdog_info imx2_wdt_info = {
.identity = "imx2+ watchdog",
.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
};
static inline void imx2_wdt_setup(struct watchdog_device *wdog)
{
struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
u32 val;
regmap_read(wdev->regmap, IMX2_WDT_WCR, &val);
/* Suspend timer in low power mode, write once-only */
val |= IMX2_WDT_WCR_WDZST;
/* Strip the old watchdog Time-Out value */
val &= ~IMX2_WDT_WCR_WT;
/* Generate reset if WDOG times out */
val &= ~IMX2_WDT_WCR_WRE;
/* Keep Watchdog Disabled */
val &= ~IMX2_WDT_WCR_WDE;
/* Set the watchdog's Time-Out value */
val |= WDOG_SEC_TO_COUNT(wdog->timeout);
regmap_write(wdev->regmap, IMX2_WDT_WCR, val);
/* enable the watchdog */
val |= IMX2_WDT_WCR_WDE;
regmap_write(wdev->regmap, IMX2_WDT_WCR, val);
}
static inline bool imx2_wdt_is_running(struct imx2_wdt_device *wdev)
{
u32 val;
regmap_read(wdev->regmap, IMX2_WDT_WCR, &val);
return val & IMX2_WDT_WCR_WDE;
}
static int imx2_wdt_ping(struct watchdog_device *wdog)
{
struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
regmap_write(wdev->regmap, IMX2_WDT_WSR, IMX2_WDT_SEQ1);
regmap_write(wdev->regmap, IMX2_WDT_WSR, IMX2_WDT_SEQ2);
return 0;
}
static void imx2_wdt_timer_ping(unsigned long arg)
{
struct watchdog_device *wdog = (struct watchdog_device *)arg;
struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
/* ping it every wdog->timeout / 2 seconds to prevent reboot */
imx2_wdt_ping(wdog);
mod_timer(&wdev->timer, jiffies + wdog->timeout * HZ / 2);
}
static int imx2_wdt_set_timeout(struct watchdog_device *wdog,
unsigned int new_timeout)
{
struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
regmap_update_bits(wdev->regmap, IMX2_WDT_WCR, IMX2_WDT_WCR_WT,
WDOG_SEC_TO_COUNT(new_timeout));
return 0;
}
static int imx2_wdt_start(struct watchdog_device *wdog)
{
struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
if (imx2_wdt_is_running(wdev)) {
/* delete the timer that pings the watchdog after close */
del_timer_sync(&wdev->timer);
imx2_wdt_set_timeout(wdog, wdog->timeout);
} else
imx2_wdt_setup(wdog);
return imx2_wdt_ping(wdog);
}
static int imx2_wdt_stop(struct watchdog_device *wdog)
{
/*
* We don't need a clk_disable, it cannot be disabled once started.
* We use a timer to ping the watchdog while /dev/watchdog is closed
*/
imx2_wdt_timer_ping((unsigned long)wdog);
return 0;
}
static inline void imx2_wdt_ping_if_active(struct watchdog_device *wdog)
{
struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
if (imx2_wdt_is_running(wdev)) {
imx2_wdt_set_timeout(wdog, wdog->timeout);
imx2_wdt_timer_ping((unsigned long)wdog);
}
}
static struct watchdog_ops imx2_wdt_ops = {
.owner = THIS_MODULE,
.start = imx2_wdt_start,
.stop = imx2_wdt_stop,
.ping = imx2_wdt_ping,
.set_timeout = imx2_wdt_set_timeout,
};
static struct regmap_config imx2_wdt_regmap_config = {
.reg_bits = 16,
.reg_stride = 2,
.val_bits = 16,
.max_register = 0x8,
};
static int __init imx2_wdt_probe(struct platform_device *pdev)
{
struct imx2_wdt_device *wdev;
struct watchdog_device *wdog;
struct resource *res;
void __iomem *base;
int ret;
u32 val;
wdev = devm_kzalloc(&pdev->dev, sizeof(*wdev), GFP_KERNEL);
if (!wdev)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
wdev->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
&imx2_wdt_regmap_config);
if (IS_ERR(wdev->regmap)) {
dev_err(&pdev->dev, "regmap init failed\n");
return PTR_ERR(wdev->regmap);
}
wdev->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(wdev->clk)) {
dev_err(&pdev->dev, "can't get Watchdog clock\n");
return PTR_ERR(wdev->clk);
}
wdog = &wdev->wdog;
wdog->info = &imx2_wdt_info;
wdog->ops = &imx2_wdt_ops;
wdog->min_timeout = 1;
wdog->max_timeout = IMX2_WDT_MAX_TIME;
clk_prepare_enable(wdev->clk);
regmap_read(wdev->regmap, IMX2_WDT_WRSR, &val);
wdog->bootstatus = val & IMX2_WDT_WRSR_TOUT ? WDIOF_CARDRESET : 0;
wdog->timeout = clamp_t(unsigned, timeout, 1, IMX2_WDT_MAX_TIME);
if (wdog->timeout != timeout)
dev_warn(&pdev->dev, "Initial timeout out of range! Clamped from %u to %u\n",
timeout, wdog->timeout);
platform_set_drvdata(pdev, wdog);
watchdog_set_drvdata(wdog, wdev);
watchdog_set_nowayout(wdog, nowayout);
watchdog_init_timeout(wdog, timeout, &pdev->dev);
setup_timer(&wdev->timer, imx2_wdt_timer_ping, (unsigned long)wdog);
imx2_wdt_ping_if_active(wdog);
ret = watchdog_register_device(wdog);
if (ret) {
dev_err(&pdev->dev, "cannot register watchdog device\n");
return ret;
}
dev_info(&pdev->dev, "timeout %d sec (nowayout=%d)\n",
wdog->timeout, nowayout);
return 0;
}
static int __exit imx2_wdt_remove(struct platform_device *pdev)
{
struct watchdog_device *wdog = platform_get_drvdata(pdev);
struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
watchdog_unregister_device(wdog);
if (imx2_wdt_is_running(wdev)) {
del_timer_sync(&wdev->timer);
imx2_wdt_ping(wdog);
dev_crit(&pdev->dev, "Device removed: Expect reboot!\n");
}
return 0;
}
static void imx2_wdt_shutdown(struct platform_device *pdev)
{
struct watchdog_device *wdog = platform_get_drvdata(pdev);
struct imx2_wdt_device *wdev = watchdog_get_drvdata(wdog);
if (imx2_wdt_is_running(wdev)) {
/*
* We are running, we need to delete the timer but will
* give max timeout before reboot will take place
*/
del_timer_sync(&wdev->timer);
imx2_wdt_set_timeout(wdog, IMX2_WDT_MAX_TIME);
imx2_wdt_ping(wdog);
dev_crit(&pdev->dev, "Device shutdown: Expect reboot!\n");
}
}
static const struct of_device_id imx2_wdt_dt_ids[] = {
{ .compatible = "fsl,imx21-wdt", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx2_wdt_dt_ids);
static struct platform_driver imx2_wdt_driver = {
.remove = __exit_p(imx2_wdt_remove),
.shutdown = imx2_wdt_shutdown,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
.of_match_table = imx2_wdt_dt_ids,
},
};
module_platform_driver_probe(imx2_wdt_driver, imx2_wdt_probe);
MODULE_AUTHOR("Wolfram Sang");
MODULE_DESCRIPTION("Watchdog driver for IMX2 and later");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRIVER_NAME);
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