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Commit f0fcbdbf authored by Xianglong Du's avatar Xianglong Du Committed by Wim Van Sebroeck
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watchdog: sirf: add watchdog driver of CSR SiRFprimaII and SiRFatlasVI 



On CSR SiRFprimaII and SiRFatlasVI, the 6th timer can act as a watchdog
timer when the Watchdog mode is enabled.

watchdog occur when TIMER watchdog counter matches the value software
pre-set, when this event occurs, the effect is the same as the system
software reset.

Signed-off-by: default avatarXianglong Du <Xianglong.Du@csr.com>
Signed-off-by: default avatarBarry Song <Baohua.Song@csr.com>
Cc: Romain Izard <romain.izard.pro@gmail.com>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
parent 85eee819

Documentation/devicetree/bindings/watchdog/sirfsoc_wdt.txt

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SiRFSoC Timer and Watchdog Timer(WDT) Controller



Required properties:

- compatible: "sirf,prima2-tick"

- reg: Address range of tick timer/WDT register set

- interrupts: interrupt number to the cpu



Example:



timer@b0020000 {

	compatible = "sirf,prima2-tick";

	reg = <0xb0020000 0x1000>;

	interrupts = <0>;

};

arch/arm/configs/prima2_defconfig

+1 −0
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@@ -39,6 +39,7 @@ CONFIG_SPI=y 
CONFIG_SPI_SIRF=y

CONFIG_SPI_SPIDEV=y

# CONFIG_HWMON is not set

CONFIG_WATCHDOG=y

CONFIG_USB_GADGET=y

CONFIG_USB_MASS_STORAGE=m

CONFIG_MMC=y

drivers/watchdog/Kconfig

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@@ -402,6 +402,15 @@ config MOXART_WDT 
	  To compile this driver as a module, choose M here: the

	  module will be called moxart_wdt.



config SIRFSOC_WATCHDOG

	tristate "SiRFSOC watchdog"

	depends on ARCH_SIRF

	select WATCHDOG_CORE

	default y

	help

	  Support for CSR SiRFprimaII and SiRFatlasVI watchdog. When

	  the watchdog triggers the system will be reset.



# AVR32 Architecture



config AT32AP700X_WDT

drivers/watchdog/Makefile

+1 −0
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@@ -56,6 +56,7 @@ obj-$(CONFIG_UX500_WATCHDOG) += ux500_wdt.o 
obj-$(CONFIG_RETU_WATCHDOG) += retu_wdt.o

obj-$(CONFIG_BCM2835_WDT) += bcm2835_wdt.o

obj-$(CONFIG_MOXART_WDT) += moxart_wdt.o

obj-$(CONFIG_SIRFSOC_WATCHDOG) += sirfsoc_wdt.o



# AVR32 Architecture

obj-$(CONFIG_AT32AP700X_WDT) += at32ap700x_wdt.o

drivers/watchdog/sirfsoc_wdt.c

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/*

 * Watchdog driver for CSR SiRFprimaII and SiRFatlasVI

 *

 * Copyright (c) 2013 Cambridge Silicon Radio Limited, a CSR plc group company.

 *

 * Licensed under GPLv2 or later.

 */



#include <linux/module.h>

#include <linux/watchdog.h>

#include <linux/platform_device.h>

#include <linux/moduleparam.h>

#include <linux/of.h>

#include <linux/io.h>

#include <linux/uaccess.h>



#define SIRFSOC_TIMER_COUNTER_LO	0x0000

#define SIRFSOC_TIMER_MATCH_0		0x0008

#define SIRFSOC_TIMER_INT_EN		0x0024

#define SIRFSOC_TIMER_WATCHDOG_EN	0x0028

#define SIRFSOC_TIMER_LATCH		0x0030

#define SIRFSOC_TIMER_LATCHED_LO	0x0034



#define SIRFSOC_TIMER_WDT_INDEX		5



#define SIRFSOC_WDT_MIN_TIMEOUT		30		/* 30 secs */

#define SIRFSOC_WDT_MAX_TIMEOUT		(10 * 60)	/* 10 mins */

#define SIRFSOC_WDT_DEFAULT_TIMEOUT	30		/* 30 secs */



static unsigned int timeout = SIRFSOC_WDT_DEFAULT_TIMEOUT;

static bool nowayout = WATCHDOG_NOWAYOUT;



module_param(timeout, uint, 0);

module_param(nowayout, bool, 0);



MODULE_PARM_DESC(timeout, "Default watchdog timeout (in seconds)");

MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="

			__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");



static unsigned int sirfsoc_wdt_gettimeleft(struct watchdog_device *wdd)

{

	u32 counter, match;

	void __iomem *wdt_base;

	int time_left;



	wdt_base = watchdog_get_drvdata(wdd);

	counter = readl(wdt_base + SIRFSOC_TIMER_COUNTER_LO);

	match = readl(wdt_base +

		SIRFSOC_TIMER_MATCH_0 + (SIRFSOC_TIMER_WDT_INDEX << 2));



	time_left = match - counter;



	return time_left / CLOCK_TICK_RATE;

}



static int sirfsoc_wdt_updatetimeout(struct watchdog_device *wdd)

{

	u32 counter, timeout_ticks;

	void __iomem *wdt_base;



	timeout_ticks = wdd->timeout * CLOCK_TICK_RATE;

	wdt_base = watchdog_get_drvdata(wdd);



	/* Enable the latch before reading the LATCH_LO register */

	writel(1, wdt_base + SIRFSOC_TIMER_LATCH);



	/* Set the TO value */

	counter = readl(wdt_base + SIRFSOC_TIMER_LATCHED_LO);



	counter += timeout_ticks;



	writel(counter, wdt_base +

		SIRFSOC_TIMER_MATCH_0 + (SIRFSOC_TIMER_WDT_INDEX << 2));



	return 0;

}



static int sirfsoc_wdt_enable(struct watchdog_device *wdd)

{

	void __iomem *wdt_base = watchdog_get_drvdata(wdd);

	sirfsoc_wdt_updatetimeout(wdd);



	/*

	 * NOTE: If interrupt is not enabled

	 * then WD-Reset doesn't get generated at all.

	 */

	writel(readl(wdt_base + SIRFSOC_TIMER_INT_EN)

		| (1 << SIRFSOC_TIMER_WDT_INDEX),

		wdt_base + SIRFSOC_TIMER_INT_EN);

	writel(1, wdt_base + SIRFSOC_TIMER_WATCHDOG_EN);



	return 0;

}



static int sirfsoc_wdt_disable(struct watchdog_device *wdd)

{

	void __iomem *wdt_base = watchdog_get_drvdata(wdd);



	writel(0, wdt_base + SIRFSOC_TIMER_WATCHDOG_EN);

	writel(readl(wdt_base + SIRFSOC_TIMER_INT_EN)

		& (~(1 << SIRFSOC_TIMER_WDT_INDEX)),

		wdt_base + SIRFSOC_TIMER_INT_EN);



	return 0;

}



static int sirfsoc_wdt_settimeout(struct watchdog_device *wdd, unsigned int to)

{

	wdd->timeout = to;

	sirfsoc_wdt_updatetimeout(wdd);



	return 0;

}



#define OPTIONS (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE)



static const struct watchdog_info sirfsoc_wdt_ident = {

	.options          =     OPTIONS,

	.firmware_version =	0,

	.identity         =	"SiRFSOC Watchdog",

};



static struct watchdog_ops sirfsoc_wdt_ops = {

	.owner = THIS_MODULE,

	.start = sirfsoc_wdt_enable,

	.stop = sirfsoc_wdt_disable,

	.get_timeleft = sirfsoc_wdt_gettimeleft,

	.ping = sirfsoc_wdt_updatetimeout,

	.set_timeout = sirfsoc_wdt_settimeout,

};



static struct watchdog_device sirfsoc_wdd = {

	.info = &sirfsoc_wdt_ident,

	.ops = &sirfsoc_wdt_ops,

	.timeout = SIRFSOC_WDT_DEFAULT_TIMEOUT,

	.min_timeout = SIRFSOC_WDT_MIN_TIMEOUT,

	.max_timeout = SIRFSOC_WDT_MAX_TIMEOUT,

};



static int sirfsoc_wdt_probe(struct platform_device *pdev)

{

	struct resource *res;

	int ret;

	void __iomem *base;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	base = devm_ioremap_resource(&pdev->dev, res);

	if (IS_ERR(base))

		return PTR_ERR(base);



	watchdog_set_drvdata(&sirfsoc_wdd, base);



	watchdog_init_timeout(&sirfsoc_wdd, timeout, &pdev->dev);

	watchdog_set_nowayout(&sirfsoc_wdd, nowayout);



	ret = watchdog_register_device(&sirfsoc_wdd);

	if (ret)

		return ret;



	platform_set_drvdata(pdev, &sirfsoc_wdd);



	return 0;

}



static void sirfsoc_wdt_shutdown(struct platform_device *pdev)

{

	struct watchdog_device *wdd = platform_get_drvdata(pdev);



	sirfsoc_wdt_disable(wdd);

}



static int sirfsoc_wdt_remove(struct platform_device *pdev)

{

	sirfsoc_wdt_shutdown(pdev);

	return 0;

}



#ifdef	CONFIG_PM_SLEEP

static int sirfsoc_wdt_suspend(struct device *dev)

{

	return 0;

}



static int sirfsoc_wdt_resume(struct device *dev)

{

	struct watchdog_device *wdd = dev_get_drvdata(dev);



	/*

	 * NOTE: Since timer controller registers settings are saved

	 * and restored back by the timer-prima2.c, so we need not

	 * update WD settings except refreshing timeout.

	 */

	sirfsoc_wdt_updatetimeout(wdd);



	return 0;

}

#endif



static SIMPLE_DEV_PM_OPS(sirfsoc_wdt_pm_ops,

		sirfsoc_wdt_suspend, sirfsoc_wdt_resume);



static const struct of_device_id sirfsoc_wdt_of_match[] = {

	{ .compatible = "sirf,prima2-tick"},

	{},

};

MODULE_DEVICE_TABLE(of, sirfsoc_wdt_of_match);



static struct platform_driver sirfsoc_wdt_driver = {

	.driver = {

		.name = "sirfsoc-wdt",

		.owner = THIS_MODULE,

		.pm = &sirfsoc_wdt_pm_ops,

		.of_match_table	= of_match_ptr(sirfsoc_wdt_of_match),

	},

	.probe = sirfsoc_wdt_probe,

	.remove = sirfsoc_wdt_remove,

	.shutdown = sirfsoc_wdt_shutdown,

};

module_platform_driver(sirfsoc_wdt_driver);



MODULE_DESCRIPTION("SiRF SoC watchdog driver");

MODULE_AUTHOR("Xianglong Du <Xianglong.Du@csr.com>");

MODULE_LICENSE("GPL v2");

MODULE_ALIAS("platform:sirfsoc-wdt");