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path: root/drivers/watchdog/ar7_wdt.c
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Diffstat (limited to 'drivers/watchdog/ar7_wdt.c')
-rw-r--r--drivers/watchdog/ar7_wdt.c107
1 files changed, 54 insertions, 53 deletions
diff --git a/drivers/watchdog/ar7_wdt.c b/drivers/watchdog/ar7_wdt.c
index 2f8643efe92c..2e94b71b20d9 100644
--- a/drivers/watchdog/ar7_wdt.c
+++ b/drivers/watchdog/ar7_wdt.c
@@ -28,9 +28,8 @@
28#include <linux/errno.h> 28#include <linux/errno.h>
29#include <linux/init.h> 29#include <linux/init.h>
30#include <linux/miscdevice.h> 30#include <linux/miscdevice.h>
31#include <linux/platform_device.h>
31#include <linux/watchdog.h> 32#include <linux/watchdog.h>
32#include <linux/notifier.h>
33#include <linux/reboot.h>
34#include <linux/fs.h> 33#include <linux/fs.h>
35#include <linux/ioport.h> 34#include <linux/ioport.h>
36#include <linux/io.h> 35#include <linux/io.h>
@@ -76,24 +75,10 @@ static unsigned expect_close;
76/* XXX currently fixed, allows max margin ~68.72 secs */ 75/* XXX currently fixed, allows max margin ~68.72 secs */
77#define prescale_value 0xffff 76#define prescale_value 0xffff
78 77
79/* Offset of the WDT registers */ 78/* Resource of the WDT registers */
80static unsigned long ar7_regs_wdt; 79static struct resource *ar7_regs_wdt;
81/* Pointer to the remapped WDT IO space */ 80/* Pointer to the remapped WDT IO space */
82static struct ar7_wdt *ar7_wdt; 81static struct ar7_wdt *ar7_wdt;
83static void ar7_wdt_get_regs(void)
84{
85 u16 chip_id = ar7_chip_id();
86 switch (chip_id) {
87 case AR7_CHIP_7100:
88 case AR7_CHIP_7200:
89 ar7_regs_wdt = AR7_REGS_WDT;
90 break;
91 default:
92 ar7_regs_wdt = UR8_REGS_WDT;
93 break;
94 }
95}
96
97 82
98static void ar7_wdt_kick(u32 value) 83static void ar7_wdt_kick(u32 value)
99{ 84{
@@ -202,20 +187,6 @@ static int ar7_wdt_release(struct inode *inode, struct file *file)
202 return 0; 187 return 0;
203} 188}
204 189
205static int ar7_wdt_notify_sys(struct notifier_block *this,
206 unsigned long code, void *unused)
207{
208 if (code == SYS_HALT || code == SYS_POWER_OFF)
209 if (!nowayout)
210 ar7_wdt_disable_wdt();
211
212 return NOTIFY_DONE;
213}
214
215static struct notifier_block ar7_wdt_notifier = {
216 .notifier_call = ar7_wdt_notify_sys,
217};
218
219static ssize_t ar7_wdt_write(struct file *file, const char *data, 190static ssize_t ar7_wdt_write(struct file *file, const char *data,
220 size_t len, loff_t *ppos) 191 size_t len, loff_t *ppos)
221{ 192{
@@ -299,56 +270,86 @@ static struct miscdevice ar7_wdt_miscdev = {
299 .fops = &ar7_wdt_fops, 270 .fops = &ar7_wdt_fops,
300}; 271};
301 272
302static int __init ar7_wdt_init(void) 273static int __devinit ar7_wdt_probe(struct platform_device *pdev)
303{ 274{
304 int rc; 275 int rc;
305 276
306 spin_lock_init(&wdt_lock); 277 spin_lock_init(&wdt_lock);
307 278
308 ar7_wdt_get_regs(); 279 ar7_regs_wdt =
280 platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
281 if (!ar7_regs_wdt) {
282 printk(KERN_ERR DRVNAME ": could not get registers resource\n");
283 rc = -ENODEV;
284 goto out;
285 }
309 286
310 if (!request_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt), 287 if (!request_mem_region(ar7_regs_wdt->start,
311 LONGNAME)) { 288 resource_size(ar7_regs_wdt), LONGNAME)) {
312 printk(KERN_WARNING DRVNAME ": watchdog I/O region busy\n"); 289 printk(KERN_WARNING DRVNAME ": watchdog I/O region busy\n");
313 return -EBUSY; 290 rc = -EBUSY;
291 goto out;
314 } 292 }
315 293
316 ar7_wdt = (struct ar7_wdt *) 294 ar7_wdt = ioremap(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
317 ioremap(ar7_regs_wdt, sizeof(struct ar7_wdt)); 295 if (!ar7_wdt) {
296 printk(KERN_ERR DRVNAME ": could not ioremap registers\n");
297 rc = -ENXIO;
298 goto out_mem_region;
299 }
318 300
319 ar7_wdt_disable_wdt(); 301 ar7_wdt_disable_wdt();
320 ar7_wdt_prescale(prescale_value); 302 ar7_wdt_prescale(prescale_value);
321 ar7_wdt_update_margin(margin); 303 ar7_wdt_update_margin(margin);
322 304
323 rc = register_reboot_notifier(&ar7_wdt_notifier);
324 if (rc) {
325 printk(KERN_ERR DRVNAME
326 ": unable to register reboot notifier\n");
327 goto out_alloc;
328 }
329
330 rc = misc_register(&ar7_wdt_miscdev); 305 rc = misc_register(&ar7_wdt_miscdev);
331 if (rc) { 306 if (rc) {
332 printk(KERN_ERR DRVNAME ": unable to register misc device\n"); 307 printk(KERN_ERR DRVNAME ": unable to register misc device\n");
333 goto out_register; 308 goto out_alloc;
334 } 309 }
335 goto out; 310 goto out;
336 311
337out_register:
338 unregister_reboot_notifier(&ar7_wdt_notifier);
339out_alloc: 312out_alloc:
340 iounmap(ar7_wdt); 313 iounmap(ar7_wdt);
341 release_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt)); 314out_mem_region:
315 release_mem_region(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
342out: 316out:
343 return rc; 317 return rc;
344} 318}
345 319
346static void __exit ar7_wdt_cleanup(void) 320static int __devexit ar7_wdt_remove(struct platform_device *pdev)
347{ 321{
348 misc_deregister(&ar7_wdt_miscdev); 322 misc_deregister(&ar7_wdt_miscdev);
349 unregister_reboot_notifier(&ar7_wdt_notifier);
350 iounmap(ar7_wdt); 323 iounmap(ar7_wdt);
351 release_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt)); 324 release_mem_region(ar7_regs_wdt->start, resource_size(ar7_regs_wdt));
325
326 return 0;
327}
328
329static void ar7_wdt_shutdown(struct platform_device *pdev)
330{
331 if (!nowayout)
332 ar7_wdt_disable_wdt();
333}
334
335static struct platform_driver ar7_wdt_driver = {
336 .probe = ar7_wdt_probe,
337 .remove = __devexit_p(ar7_wdt_remove),
338 .shutdown = ar7_wdt_shutdown,
339 .driver = {
340 .owner = THIS_MODULE,
341 .name = "ar7_wdt",
342 },
343};
344
345static int __init ar7_wdt_init(void)
346{
347 return platform_driver_register(&ar7_wdt_driver);
348}
349
350static void __exit ar7_wdt_cleanup(void)
351{
352 platform_driver_unregister(&ar7_wdt_driver);
352} 353}
353 354
354module_init(ar7_wdt_init); 355module_init(ar7_wdt_init);