diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-03-03 10:23:29 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-03-03 10:23:29 -0800 |
commit | 68b86a25225d03f134f306caffc46df80906c3f8 (patch) | |
tree | d5f6556e07e3fb376199c2ba70153c17d47b7607 /drivers/watchdog/stmp3xxx_rtc_wdt.c | |
parent | 527c680f7c36ff17d49efc99632232dba3549c51 (diff) | |
parent | 41e9f3f71bc7a5d41a2b925cfdc0dc22a77f7d8c (diff) |
Merge git://www.linux-watchdog.org/linux-watchdog
Pull watchdog updates from Wim Van Sebroeck:
"This contains:
- fixes and improvements
- devicetree bindings
- conversion to watchdog generic framework of the following drivers:
- booke_wdt
- bcm47xx_wdt.c
- at91sam9_wdt
- Removal of old STMP3xxx driver
- Addition of following new drivers:
- new driver for STMP3xxx and i.MX23/28
- Retu watchdog driver"
* git://www.linux-watchdog.org/linux-watchdog: (30 commits)
watchdog: sp805_wdt depends on ARM
watchdog: davinci_wdt: update to devm_* API
watchdog: davinci_wdt: use devm managed clk get
watchdog: at91rm9200: add DT support
watchdog: add timeout-sec property binding
watchdog: at91sam9_wdt: Convert to use the watchdog framework
watchdog: omap_wdt: Add option nowayout
watchdog: core: dt: add support for the timeout-sec dt property
watchdog: bcm47xx_wdt.c: add hard timer
watchdog: bcm47xx_wdt.c: rename wdt_time to timeout
watchdog: bcm47xx_wdt.c: rename ops methods
watchdog: bcm47xx_wdt.c: use platform device
watchdog: bcm47xx_wdt.c: convert to watchdog core api
watchdog: Convert BookE watchdog driver to watchdog infrastructure
watchdog: s3c2410_wdt: Use devm_* functions
watchdog: remove old STMP3xxx driver
watchdog: add new driver for STMP3xxx and i.MX23/28
rtc: stmp3xxx: add wdt-accessor function
watchdog: introduce retu_wdt driver
watchdog: intel_scu_watchdog: fix Kconfig dependency
...
Diffstat (limited to 'drivers/watchdog/stmp3xxx_rtc_wdt.c')
-rw-r--r-- | drivers/watchdog/stmp3xxx_rtc_wdt.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/drivers/watchdog/stmp3xxx_rtc_wdt.c b/drivers/watchdog/stmp3xxx_rtc_wdt.c new file mode 100644 index 00000000000..c97e98dcde6 --- /dev/null +++ b/drivers/watchdog/stmp3xxx_rtc_wdt.c @@ -0,0 +1,111 @@ +/* + * Watchdog driver for the RTC based watchdog in STMP3xxx and i.MX23/28 + * + * Author: Wolfram Sang <w.sang@pengutronix.de> + * + * Copyright (C) 2011-12 Wolfram Sang, Pengutronix + * + * 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. + */ +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/miscdevice.h> +#include <linux/watchdog.h> +#include <linux/platform_device.h> +#include <linux/stmp3xxx_rtc_wdt.h> + +#define WDOG_TICK_RATE 1000 /* 1 kHz clock */ +#define STMP3XXX_DEFAULT_TIMEOUT 19 +#define STMP3XXX_MAX_TIMEOUT (UINT_MAX / WDOG_TICK_RATE) + +static int heartbeat = STMP3XXX_DEFAULT_TIMEOUT; +module_param(heartbeat, uint, 0); +MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat period in seconds from 1 to " + __MODULE_STRING(STMP3XXX_MAX_TIMEOUT) ", default " + __MODULE_STRING(STMP3XXX_DEFAULT_TIMEOUT)); + +static int wdt_start(struct watchdog_device *wdd) +{ + struct device *dev = watchdog_get_drvdata(wdd); + struct stmp3xxx_wdt_pdata *pdata = dev->platform_data; + + pdata->wdt_set_timeout(dev->parent, wdd->timeout * WDOG_TICK_RATE); + return 0; +} + +static int wdt_stop(struct watchdog_device *wdd) +{ + struct device *dev = watchdog_get_drvdata(wdd); + struct stmp3xxx_wdt_pdata *pdata = dev->platform_data; + + pdata->wdt_set_timeout(dev->parent, 0); + return 0; +} + +static int wdt_set_timeout(struct watchdog_device *wdd, unsigned new_timeout) +{ + wdd->timeout = new_timeout; + return wdt_start(wdd); +} + +static const struct watchdog_info stmp3xxx_wdt_ident = { + .options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, + .identity = "STMP3XXX RTC Watchdog", +}; + +static const struct watchdog_ops stmp3xxx_wdt_ops = { + .owner = THIS_MODULE, + .start = wdt_start, + .stop = wdt_stop, + .set_timeout = wdt_set_timeout, +}; + +static struct watchdog_device stmp3xxx_wdd = { + .info = &stmp3xxx_wdt_ident, + .ops = &stmp3xxx_wdt_ops, + .min_timeout = 1, + .max_timeout = STMP3XXX_MAX_TIMEOUT, + .status = WATCHDOG_NOWAYOUT_INIT_STATUS, +}; + +static int stmp3xxx_wdt_probe(struct platform_device *pdev) +{ + int ret; + + watchdog_set_drvdata(&stmp3xxx_wdd, &pdev->dev); + + stmp3xxx_wdd.timeout = clamp_t(unsigned, heartbeat, 1, STMP3XXX_MAX_TIMEOUT); + + ret = watchdog_register_device(&stmp3xxx_wdd); + if (ret < 0) { + dev_err(&pdev->dev, "cannot register watchdog device\n"); + return ret; + } + + dev_info(&pdev->dev, "initialized watchdog with heartbeat %ds\n", + stmp3xxx_wdd.timeout); + return 0; +} + +static int stmp3xxx_wdt_remove(struct platform_device *pdev) +{ + watchdog_unregister_device(&stmp3xxx_wdd); + return 0; +} + +static struct platform_driver stmp3xxx_wdt_driver = { + .driver = { + .name = "stmp3xxx_rtc_wdt", + }, + .probe = stmp3xxx_wdt_probe, + .remove = stmp3xxx_wdt_remove, +}; +module_platform_driver(stmp3xxx_wdt_driver); + +MODULE_DESCRIPTION("STMP3XXX RTC Watchdog Driver"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Wolfram Sang <w.sang@pengutronix.de>"); +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |