[WATCHDOG] ar7_wdt: convert to become a platform driver
This patch converts the ar7_wdt driver to become
a platform driver. The AR7 SoC specific identification
and base register calculation is performed by the board
code, therefore we no longer need to have access to
ar7_chip_id. We also remove the reboot notifier code to
use the platform shutdown method as Wim suggested.
Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
diff --git a/drivers/watchdog/ar7_wdt.c b/drivers/watchdog/ar7_wdt.c
index 2f8643e..82855b0 100644
--- a/drivers/watchdog/ar7_wdt.c
+++ b/drivers/watchdog/ar7_wdt.c
@@ -28,9 +28,8 @@
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/miscdevice.h>
+#include <linux/platform_device.h>
#include <linux/watchdog.h>
-#include <linux/notifier.h>
-#include <linux/reboot.h>
#include <linux/fs.h>
#include <linux/ioport.h>
#include <linux/io.h>
@@ -76,24 +75,10 @@
/* XXX currently fixed, allows max margin ~68.72 secs */
#define prescale_value 0xffff
-/* Offset of the WDT registers */
-static unsigned long ar7_regs_wdt;
+/* Resource of the WDT registers */
+static struct resource *ar7_regs_wdt;
/* Pointer to the remapped WDT IO space */
static struct ar7_wdt *ar7_wdt;
-static void ar7_wdt_get_regs(void)
-{
- u16 chip_id = ar7_chip_id();
- switch (chip_id) {
- case AR7_CHIP_7100:
- case AR7_CHIP_7200:
- ar7_regs_wdt = AR7_REGS_WDT;
- break;
- default:
- ar7_regs_wdt = UR8_REGS_WDT;
- break;
- }
-}
-
static void ar7_wdt_kick(u32 value)
{
@@ -202,20 +187,6 @@
return 0;
}
-static int ar7_wdt_notify_sys(struct notifier_block *this,
- unsigned long code, void *unused)
-{
- if (code == SYS_HALT || code == SYS_POWER_OFF)
- if (!nowayout)
- ar7_wdt_disable_wdt();
-
- return NOTIFY_DONE;
-}
-
-static struct notifier_block ar7_wdt_notifier = {
- .notifier_call = ar7_wdt_notify_sys,
-};
-
static ssize_t ar7_wdt_write(struct file *file, const char *data,
size_t len, loff_t *ppos)
{
@@ -299,56 +270,85 @@
.fops = &ar7_wdt_fops,
};
-static int __init ar7_wdt_init(void)
+static int __devinit ar7_wdt_probe(struct platform_device *pdev)
{
int rc;
spin_lock_init(&wdt_lock);
- ar7_wdt_get_regs();
-
- if (!request_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt),
- LONGNAME)) {
- printk(KERN_WARNING DRVNAME ": watchdog I/O region busy\n");
- return -EBUSY;
+ ar7_regs_wdt =
+ platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
+ if (!ar7_regs_wdt) {
+ printk(KERN_ERR DRVNAME ": could not get registers resource\n");
+ rc = -ENODEV;
+ goto out;
}
- ar7_wdt = (struct ar7_wdt *)
- ioremap(ar7_regs_wdt, sizeof(struct ar7_wdt));
+ if (!request_mem_region(ar7_regs_wdt->start,
+ resource_size(ar7_regs_wdt), LONGNAME)) {
+ printk(KERN_WARNING DRVNAME ": watchdog I/O region busy\n");
+ rc = -EBUSY;
+ goto out;
+ }
+
+ ar7_wdt = ioremap(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
+ if (!ar7_wdt) {
+ printk(KERN_ERR DRVNAME ": could not ioremap registers\n");
+ rc = -ENXIO;
+ goto out;
+ }
ar7_wdt_disable_wdt();
ar7_wdt_prescale(prescale_value);
ar7_wdt_update_margin(margin);
- rc = register_reboot_notifier(&ar7_wdt_notifier);
- if (rc) {
- printk(KERN_ERR DRVNAME
- ": unable to register reboot notifier\n");
- goto out_alloc;
- }
-
rc = misc_register(&ar7_wdt_miscdev);
if (rc) {
printk(KERN_ERR DRVNAME ": unable to register misc device\n");
- goto out_register;
+ goto out_alloc;
}
goto out;
-out_register:
- unregister_reboot_notifier(&ar7_wdt_notifier);
out_alloc:
iounmap(ar7_wdt);
- release_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt));
+ release_mem_region(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
out:
return rc;
}
-static void __exit ar7_wdt_cleanup(void)
+static int __devexit ar7_wdt_remove(struct platform_device *pdev)
{
misc_deregister(&ar7_wdt_miscdev);
- unregister_reboot_notifier(&ar7_wdt_notifier);
iounmap(ar7_wdt);
- release_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt));
+ release_mem_region(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
+
+ return 0;
+}
+
+static void ar7_wdt_shutdown(struct platform_device *pdev)
+{
+ if (!nowayout)
+ ar7_wdt_disable_wdt();
+}
+
+static struct platform_driver ar7_wdt_driver = {
+ .probe = ar7_wdt_probe,
+ .remove = __devexit_p(ar7_wdt_remove),
+ .shutdown = ar7_wdt_shutdown,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "ar7_wdt",
+ },
+};
+
+static int __init ar7_wdt_init(void)
+{
+ return platform_driver_register(&ar7_wdt_driver);
+}
+
+static void __exit ar7_wdt_cleanup(void)
+{
+ platform_driver_unregister(&ar7_wdt_driver);
}
module_init(ar7_wdt_init);