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authorH Hartley Sweeten <hsweeten@visionengravers.com>2012-01-22 20:01:16 +1100
committerRyan Mallon <rmallon@gmail.com>2012-03-14 11:41:11 +1100
commit73303d129201de7af7fa837597e9c470c5efa71f (patch)
tree0990de666d5c3cb4a95182b4f163cd0086e40e37
parent0fd1958050e92c859152e775e548284582335d25 (diff)
ep93xx: Convert the watchdog driver into a platform device.
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>
-rw-r--r--arch/arm/mach-ep93xx/core.c15
-rw-r--r--arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h1
-rw-r--r--drivers/watchdog/ep93xx_wdt.c51
3 files changed, 53 insertions, 14 deletions
diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index c73e299b08a5..3134baf6c7a4 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -889,6 +889,20 @@ 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 */
@@ -904,6 +918,7 @@ 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)
diff --git a/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h b/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h
index 72b86878e196..f28afcf29fc1 100644
--- a/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h
+++ b/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h
@@ -182,6 +182,7 @@
#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)
diff --git a/drivers/watchdog/ep93xx_wdt.c b/drivers/watchdog/ep93xx_wdt.c
index 726b7df61fd0..09cd888db619 100644
--- a/drivers/watchdog/ep93xx_wdt.c
+++ b/drivers/watchdog/ep93xx_wdt.c
@@ -23,6 +23,7 @@
* - Add a few missing ioctls
*/
+#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
@@ -30,7 +31,6 @@
#include <linux/timer.h>
#include <linux/uaccess.h>
#include <linux/io.h>
-#include <mach/hardware.h>
#define WDT_VERSION "0.3"
#define PFX "ep93xx_wdt: "
@@ -41,6 +41,7 @@
static int 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;
@@ -49,26 +50,25 @@ 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)
@@ -206,18 +206,32 @@ 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;
printk(KERN_INFO PFX "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;
@@ -230,14 +244,23 @@ 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, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");