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watchdog: ep93xx: Convert the watchdog driver into a platform device.

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Convert the ep93xx watchdog driver into a platform device and
remove it's dependency on <mach/hardware.h>.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Ryan Mallon <rmallon@gmail.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Reviewed-by: Mika Westerberg <mika.westerberg@iki.fi>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
H Hartley Sweeten 2012-03-13 09:48:16 +11:00 committed by Wim Van Sebroeck
parent 0197c1c49e
commit 3e0113a896
3 changed files with 53 additions and 14 deletions
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15
arch/arm/mach-ep93xx/core.c
View File

@ -845,6 +845,20 @@ void __init ep93xx_register_ac97(void)
platform_device_register(&ep93xx_pcm_device);
}
/*************************************************************************
* EP93xx Watchdog
*************************************************************************/
static struct resource ep93xx_wdt_resources[] = {
DEFINE_RES_MEM(EP93XX_WATCHDOG_PHYS_BASE, 0x08),
};
static struct platform_device ep93xx_wdt_device = {
.name = "ep93xx-wdt",
.id = -1,
.num_resources = ARRAY_SIZE(ep93xx_wdt_resources),
.resource = ep93xx_wdt_resources,
};
void __init ep93xx_init_devices(void)
{
/* Disallow access to MaverickCrunch initially */
@ -860,6 +874,7 @@ void __init ep93xx_init_devices(void)
platform_device_register(&ep93xx_rtc_device);
platform_device_register(&ep93xx_ohci_device);
platform_device_register(&ep93xx_leds);
platform_device_register(&ep93xx_wdt_device);
}
void ep93xx_restart(char mode, const char *cmd)

1
arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h
View File

@ -224,6 +224,7 @@
#define EP93XX_SYSCON_SYSCFG_LCSN1 (1<<0)
#define EP93XX_SYSCON_SWLOCK EP93XX_SYSCON_REG(0xc0)
#define EP93XX_WATCHDOG_PHYS_BASE EP93XX_APB_PHYS(0x00140000)
#define EP93XX_WATCHDOG_BASE EP93XX_APB_IOMEM(0x00140000)

51
drivers/watchdog/ep93xx_wdt.c
View File

@ -25,6 +25,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
@ -32,7 +33,6 @@
#include <linux/timer.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <mach/hardware.h>
#define WDT_VERSION "0.3"
@ -42,6 +42,7 @@
static bool nowayout = WATCHDOG_NOWAYOUT;
static int timeout = WDT_TIMEOUT;
static void __iomem *mmio_base;
static struct timer_list timer;
static unsigned long next_heartbeat;
static unsigned long wdt_status;
@ -50,26 +51,25 @@ static unsigned long boot_status;
#define WDT_IN_USE 0
#define WDT_OK_TO_CLOSE 1
#define EP93XX_WDT_REG(x) (EP93XX_WATCHDOG_BASE + (x))
#define EP93XX_WDT_WATCHDOG EP93XX_WDT_REG(0x00)
#define EP93XX_WDT_WDSTATUS EP93XX_WDT_REG(0x04)
#define EP93XX_WATCHDOG 0x00
#define EP93XX_WDSTATUS 0x04
/* reset the wdt every ~200ms */
#define WDT_INTERVAL (HZ/5)
static void wdt_enable(void)
{
__raw_writew(0xaaaa, EP93XX_WDT_WATCHDOG);
writel(0xaaaa, mmio_base + EP93XX_WATCHDOG);
}
static void wdt_disable(void)
{
__raw_writew(0xaa55, EP93XX_WDT_WATCHDOG);
writel(0xaa55, mmio_base + EP93XX_WATCHDOG);
}
static inline void wdt_ping(void)
{
__raw_writew(0x5555, EP93XX_WDT_WATCHDOG);
writel(0x5555, mmio_base + EP93XX_WATCHDOG);
}
static void wdt_startup(void)
@ -206,17 +206,31 @@ static void ep93xx_timer_ping(unsigned long data)
mod_timer(&timer, jiffies + WDT_INTERVAL);
}
static int __init ep93xx_wdt_init(void)
static int __devinit ep93xx_wdt_probe(struct platform_device *pdev)
{
struct resource *res;
unsigned long val;
int err;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENXIO;
if (!devm_request_mem_region(&pdev->dev, res->start,
resource_size(res), pdev->name))
return -EBUSY;
mmio_base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!mmio_base)
return -ENXIO;
err = misc_register(&ep93xx_wdt_miscdev);
boot_status = __raw_readl(EP93XX_WDT_WATCHDOG) & 0x01 ? 1 : 0;
val = readl(mmio_base + EP93XX_WATCHDOG);
boot_status = val & 0x01 ? 1 : 0;
pr_info("EP93XX watchdog, driver version " WDT_VERSION "%s\n",
(__raw_readl(EP93XX_WDT_WATCHDOG) & 0x08)
? " (nCS1 disable detected)" : "");
(val & 0x08) ? " (nCS1 disable detected)" : "");
if (timeout < 1 || timeout > 3600) {
timeout = WDT_TIMEOUT;
@ -228,14 +242,23 @@ static int __init ep93xx_wdt_init(void)
return err;
}
static void __exit ep93xx_wdt_exit(void)
static int __devexit ep93xx_wdt_remove(struct platform_device *pdev)
{
wdt_shutdown();
misc_deregister(&ep93xx_wdt_miscdev);
return 0;
}
module_init(ep93xx_wdt_init);
module_exit(ep93xx_wdt_exit);
static struct platform_driver ep93xx_wdt_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "ep93xx-wdt",
},
.probe = ep93xx_wdt_probe,
.remove = __devexit_p(ep93xx_wdt_remove),
};
module_platform_driver(ep93xx_wdt_driver);
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");