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path: root/drivers/watchdog/alim7101_wdt.c
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Diffstat (limited to 'drivers/watchdog/alim7101_wdt.c')
-rw-r--r--drivers/watchdog/alim7101_wdt.c224
1 files changed, 118 insertions, 106 deletions
diff --git a/drivers/watchdog/alim7101_wdt.c b/drivers/watchdog/alim7101_wdt.c
index 238273c98656..c495f36c6aa9 100644
--- a/drivers/watchdog/alim7101_wdt.c
+++ b/drivers/watchdog/alim7101_wdt.c
@@ -32,8 +32,8 @@
32#include <linux/fs.h> 32#include <linux/fs.h>
33#include <linux/pci.h> 33#include <linux/pci.h>
34 34
35#include <asm/io.h> 35#include <linux/io.h>
36#include <asm/uaccess.h> 36#include <linux/uaccess.h>
37#include <asm/system.h> 37#include <asm/system.h>
38 38
39#define OUR_NAME "alim7101_wdt" 39#define OUR_NAME "alim7101_wdt"
@@ -60,13 +60,17 @@
60 */ 60 */
61 61
62#define WATCHDOG_TIMEOUT 30 /* 30 sec default timeout */ 62#define WATCHDOG_TIMEOUT 30 /* 30 sec default timeout */
63static int timeout = WATCHDOG_TIMEOUT; /* in seconds, will be multiplied by HZ to get seconds to wait for a ping */ 63/* in seconds, will be multiplied by HZ to get seconds to wait for a ping */
64static int timeout = WATCHDOG_TIMEOUT;
64module_param(timeout, int, 0); 65module_param(timeout, int, 0);
65MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (1<=timeout<=3600, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); 66MODULE_PARM_DESC(timeout,
67 "Watchdog timeout in seconds. (1<=timeout<=3600, default="
68 __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
66 69
67static int use_gpio = 0; /* Use the pic (for a1d revision alim7101) */ 70static int use_gpio; /* Use the pic (for a1d revision alim7101) */
68module_param(use_gpio, int, 0); 71module_param(use_gpio, int, 0);
69MODULE_PARM_DESC(use_gpio, "Use the gpio watchdog. (required by old cobalt boards)"); 72MODULE_PARM_DESC(use_gpio,
73 "Use the gpio watchdog (required by old cobalt boards).");
70 74
71static void wdt_timer_ping(unsigned long); 75static void wdt_timer_ping(unsigned long);
72static DEFINE_TIMER(timer, wdt_timer_ping, 0, 1); 76static DEFINE_TIMER(timer, wdt_timer_ping, 0, 1);
@@ -77,8 +81,9 @@ static struct pci_dev *alim7101_pmu;
77 81
78static int nowayout = WATCHDOG_NOWAYOUT; 82static int nowayout = WATCHDOG_NOWAYOUT;
79module_param(nowayout, int, 0); 83module_param(nowayout, int, 0);
80MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" 84MODULE_PARM_DESC(nowayout,
81 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 85 "Watchdog cannot be stopped once started (default="
86 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
82 87
83/* 88/*
84 * Whack the dog 89 * Whack the dog
@@ -89,23 +94,26 @@ static void wdt_timer_ping(unsigned long data)
89 /* If we got a heartbeat pulse within the WDT_US_INTERVAL 94 /* If we got a heartbeat pulse within the WDT_US_INTERVAL
90 * we agree to ping the WDT 95 * we agree to ping the WDT
91 */ 96 */
92 char tmp; 97 char tmp;
93 98
94 if(time_before(jiffies, next_heartbeat)) 99 if (time_before(jiffies, next_heartbeat)) {
95 {
96 /* Ping the WDT (this is actually a disarm/arm sequence) */ 100 /* Ping the WDT (this is actually a disarm/arm sequence) */
97 pci_read_config_byte(alim7101_pmu, 0x92, &tmp); 101 pci_read_config_byte(alim7101_pmu, 0x92, &tmp);
98 pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp & ~ALI_WDT_ARM)); 102 pci_write_config_byte(alim7101_pmu,
99 pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp | ALI_WDT_ARM)); 103 ALI_7101_WDT, (tmp & ~ALI_WDT_ARM));
104 pci_write_config_byte(alim7101_pmu,
105 ALI_7101_WDT, (tmp | ALI_WDT_ARM));
100 if (use_gpio) { 106 if (use_gpio) {
101 pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp); 107 pci_read_config_byte(alim7101_pmu,
102 pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp 108 ALI_7101_GPIO_O, &tmp);
103 | 0x20); 109 pci_write_config_byte(alim7101_pmu,
104 pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp 110 ALI_7101_GPIO_O, tmp | 0x20);
105 & ~0x20); 111 pci_write_config_byte(alim7101_pmu,
112 ALI_7101_GPIO_O, tmp & ~0x20);
106 } 113 }
107 } else { 114 } else {
108 printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n"); 115 printk(KERN_WARNING PFX
116 "Heartbeat lost! Will not ping the watchdog\n");
109 } 117 }
110 /* Re-set the timer interval */ 118 /* Re-set the timer interval */
111 mod_timer(&timer, jiffies + WDT_INTERVAL); 119 mod_timer(&timer, jiffies + WDT_INTERVAL);
@@ -121,17 +129,23 @@ static void wdt_change(int writeval)
121 129
122 pci_read_config_byte(alim7101_pmu, ALI_7101_WDT, &tmp); 130 pci_read_config_byte(alim7101_pmu, ALI_7101_WDT, &tmp);
123 if (writeval == WDT_ENABLE) { 131 if (writeval == WDT_ENABLE) {
124 pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp | ALI_WDT_ARM)); 132 pci_write_config_byte(alim7101_pmu,
133 ALI_7101_WDT, (tmp | ALI_WDT_ARM));
125 if (use_gpio) { 134 if (use_gpio) {
126 pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp); 135 pci_read_config_byte(alim7101_pmu,
127 pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp & ~0x20); 136 ALI_7101_GPIO_O, &tmp);
137 pci_write_config_byte(alim7101_pmu,
138 ALI_7101_GPIO_O, tmp & ~0x20);
128 } 139 }
129 140
130 } else { 141 } else {
131 pci_write_config_byte(alim7101_pmu, ALI_7101_WDT, (tmp & ~ALI_WDT_ARM)); 142 pci_write_config_byte(alim7101_pmu,
143 ALI_7101_WDT, (tmp & ~ALI_WDT_ARM));
132 if (use_gpio) { 144 if (use_gpio) {
133 pci_read_config_byte(alim7101_pmu, ALI_7101_GPIO_O, &tmp); 145 pci_read_config_byte(alim7101_pmu,
134 pci_write_config_byte(alim7101_pmu, ALI_7101_GPIO_O, tmp | 0x20); 146 ALI_7101_GPIO_O, &tmp);
147 pci_write_config_byte(alim7101_pmu,
148 ALI_7101_GPIO_O, tmp | 0x20);
135 } 149 }
136 } 150 }
137} 151}
@@ -169,10 +183,11 @@ static void wdt_keepalive(void)
169 * /dev/watchdog handling 183 * /dev/watchdog handling
170 */ 184 */
171 185
172static ssize_t fop_write(struct file * file, const char __user * buf, size_t count, loff_t * ppos) 186static ssize_t fop_write(struct file *file, const char __user *buf,
187 size_t count, loff_t *ppos)
173{ 188{
174 /* See if we got the magic character 'V' and reload the timer */ 189 /* See if we got the magic character 'V' and reload the timer */
175 if(count) { 190 if (count) {
176 if (!nowayout) { 191 if (!nowayout) {
177 size_t ofs; 192 size_t ofs;
178 193
@@ -195,119 +210,116 @@ static ssize_t fop_write(struct file * file, const char __user * buf, size_t cou
195 return count; 210 return count;
196} 211}
197 212
198static int fop_open(struct inode * inode, struct file * file) 213static int fop_open(struct inode *inode, struct file *file)
199{ 214{
200 /* Just in case we're already talking to someone... */ 215 /* Just in case we're already talking to someone... */
201 if(test_and_set_bit(0, &wdt_is_open)) 216 if (test_and_set_bit(0, &wdt_is_open))
202 return -EBUSY; 217 return -EBUSY;
203 /* Good, fire up the show */ 218 /* Good, fire up the show */
204 wdt_startup(); 219 wdt_startup();
205 return nonseekable_open(inode, file); 220 return nonseekable_open(inode, file);
206} 221}
207 222
208static int fop_close(struct inode * inode, struct file * file) 223static int fop_close(struct inode *inode, struct file *file)
209{ 224{
210 if(wdt_expect_close == 42) 225 if (wdt_expect_close == 42)
211 wdt_turnoff(); 226 wdt_turnoff();
212 else { 227 else {
213 /* wim: shouldn't there be a: del_timer(&timer); */ 228 /* wim: shouldn't there be a: del_timer(&timer); */
214 printk(KERN_CRIT PFX "device file closed unexpectedly. Will not stop the WDT!\n"); 229 printk(KERN_CRIT PFX
230 "device file closed unexpectedly. Will not stop the WDT!\n");
215 } 231 }
216 clear_bit(0, &wdt_is_open); 232 clear_bit(0, &wdt_is_open);
217 wdt_expect_close = 0; 233 wdt_expect_close = 0;
218 return 0; 234 return 0;
219} 235}
220 236
221static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) 237static long fop_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
222{ 238{
223 void __user *argp = (void __user *)arg; 239 void __user *argp = (void __user *)arg;
224 int __user *p = argp; 240 int __user *p = argp;
225 static struct watchdog_info ident = 241 static struct watchdog_info ident = {
226 { 242 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT
227 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, 243 | WDIOF_MAGICCLOSE,
228 .firmware_version = 1, 244 .firmware_version = 1,
229 .identity = "ALiM7101", 245 .identity = "ALiM7101",
230 }; 246 };
231 247
232 switch(cmd) 248 switch (cmd) {
249 case WDIOC_GETSUPPORT:
250 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
251 case WDIOC_GETSTATUS:
252 case WDIOC_GETBOOTSTATUS:
253 return put_user(0, p);
254 case WDIOC_KEEPALIVE:
255 wdt_keepalive();
256 return 0;
257 case WDIOC_SETOPTIONS:
233 { 258 {
234 case WDIOC_GETSUPPORT: 259 int new_options, retval = -EINVAL;
235 return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0;
236 case WDIOC_GETSTATUS:
237 case WDIOC_GETBOOTSTATUS:
238 return put_user(0, p);
239 case WDIOC_KEEPALIVE:
240 wdt_keepalive();
241 return 0;
242 case WDIOC_SETOPTIONS:
243 {
244 int new_options, retval = -EINVAL;
245
246 if(get_user(new_options, p))
247 return -EFAULT;
248
249 if(new_options & WDIOS_DISABLECARD) {
250 wdt_turnoff();
251 retval = 0;
252 }
253
254 if(new_options & WDIOS_ENABLECARD) {
255 wdt_startup();
256 retval = 0;
257 }
258 260
259 return retval; 261 if (get_user(new_options, p))
262 return -EFAULT;
263 if (new_options & WDIOS_DISABLECARD) {
264 wdt_turnoff();
265 retval = 0;
260 } 266 }
261 case WDIOC_SETTIMEOUT: 267 if (new_options & WDIOS_ENABLECARD) {
262 { 268 wdt_startup();
263 int new_timeout; 269 retval = 0;
264
265 if(get_user(new_timeout, p))
266 return -EFAULT;
267
268 if(new_timeout < 1 || new_timeout > 3600) /* arbitrary upper limit */
269 return -EINVAL;
270
271 timeout = new_timeout;
272 wdt_keepalive();
273 /* Fall through */
274 } 270 }
275 case WDIOC_GETTIMEOUT: 271 return retval;
276 return put_user(timeout, p); 272 }
277 default: 273 case WDIOC_SETTIMEOUT:
278 return -ENOTTY; 274 {
275 int new_timeout;
276
277 if (get_user(new_timeout, p))
278 return -EFAULT;
279 /* arbitrary upper limit */
280 if (new_timeout < 1 || new_timeout > 3600)
281 return -EINVAL;
282 timeout = new_timeout;
283 wdt_keepalive();
284 /* Fall through */
285 }
286 case WDIOC_GETTIMEOUT:
287 return put_user(timeout, p);
288 default:
289 return -ENOTTY;
279 } 290 }
280} 291}
281 292
282static const struct file_operations wdt_fops = { 293static const struct file_operations wdt_fops = {
283 .owner= THIS_MODULE, 294 .owner = THIS_MODULE,
284 .llseek= no_llseek, 295 .llseek = no_llseek,
285 .write= fop_write, 296 .write = fop_write,
286 .open= fop_open, 297 .open = fop_open,
287 .release= fop_close, 298 .release = fop_close,
288 .ioctl= fop_ioctl, 299 .unlocked_ioctl = fop_ioctl,
289}; 300};
290 301
291static struct miscdevice wdt_miscdev = { 302static struct miscdevice wdt_miscdev = {
292 .minor=WATCHDOG_MINOR, 303 .minor = WATCHDOG_MINOR,
293 .name="watchdog", 304 .name = "watchdog",
294 .fops=&wdt_fops, 305 .fops = &wdt_fops,
295}; 306};
296 307
297/* 308/*
298 * Notifier for system down 309 * Notifier for system down
299 */ 310 */
300 311
301static int wdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused) 312static int wdt_notify_sys(struct notifier_block *this,
313 unsigned long code, void *unused)
302{ 314{
303 if (code==SYS_DOWN || code==SYS_HALT) 315 if (code == SYS_DOWN || code == SYS_HALT)
304 wdt_turnoff(); 316 wdt_turnoff();
305 317
306 if (code==SYS_RESTART) { 318 if (code == SYS_RESTART) {
307 /* 319 /*
308 * Cobalt devices have no way of rebooting themselves other than 320 * Cobalt devices have no way of rebooting themselves other
309 * getting the watchdog to pull reset, so we restart the watchdog on 321 * than getting the watchdog to pull reset, so we restart the
310 * reboot with no heartbeat 322 * watchdog on reboot with no heartbeat
311 */ 323 */
312 wdt_change(WDT_ENABLE); 324 wdt_change(WDT_ENABLE);
313 printk(KERN_INFO PFX "Watchdog timer is now enabled with no heartbeat - should reboot in ~1 second.\n"); 325 printk(KERN_INFO PFX "Watchdog timer is now enabled with no heartbeat - should reboot in ~1 second.\n");
@@ -320,8 +332,7 @@ static int wdt_notify_sys(struct notifier_block *this, unsigned long code, void
320 * turn the timebomb registers off. 332 * turn the timebomb registers off.
321 */ 333 */
322 334
323static struct notifier_block wdt_notifier= 335static struct notifier_block wdt_notifier = {
324{
325 .notifier_call = wdt_notify_sys, 336 .notifier_call = wdt_notify_sys,
326}; 337};
327 338
@@ -354,7 +365,8 @@ static int __init alim7101_wdt_init(void)
354 ali1543_south = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, 365 ali1543_south = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533,
355 NULL); 366 NULL);
356 if (!ali1543_south) { 367 if (!ali1543_south) {
357 printk(KERN_INFO PFX "ALi 1543 South-Bridge not present - WDT not set\n"); 368 printk(KERN_INFO PFX
369 "ALi 1543 South-Bridge not present - WDT not set\n");
358 goto err_out; 370 goto err_out;
359 } 371 }
360 pci_read_config_byte(ali1543_south, 0x5e, &tmp); 372 pci_read_config_byte(ali1543_south, 0x5e, &tmp);
@@ -363,24 +375,25 @@ static int __init alim7101_wdt_init(void)
363 if (!use_gpio) { 375 if (!use_gpio) {
364 printk(KERN_INFO PFX "Detected old alim7101 revision 'a1d'. If this is a cobalt board, set the 'use_gpio' module parameter.\n"); 376 printk(KERN_INFO PFX "Detected old alim7101 revision 'a1d'. If this is a cobalt board, set the 'use_gpio' module parameter.\n");
365 goto err_out; 377 goto err_out;
366 } 378 }
367 nowayout = 1; 379 nowayout = 1;
368 } else if ((tmp & 0x1e) != 0x12 && (tmp & 0x1e) != 0x00) { 380 } else if ((tmp & 0x1e) != 0x12 && (tmp & 0x1e) != 0x00) {
369 printk(KERN_INFO PFX "ALi 1543 South-Bridge does not have the correct revision number (???1001?) - WDT not set\n"); 381 printk(KERN_INFO PFX "ALi 1543 South-Bridge does not have the correct revision number (???1001?) - WDT not set\n");
370 goto err_out; 382 goto err_out;
371 } 383 }
372 384
373 if(timeout < 1 || timeout > 3600) /* arbitrary upper limit */ 385 if (timeout < 1 || timeout > 3600) {
374 { 386 /* arbitrary upper limit */
375 timeout = WATCHDOG_TIMEOUT; 387 timeout = WATCHDOG_TIMEOUT;
376 printk(KERN_INFO PFX "timeout value must be 1<=x<=3600, using %d\n", 388 printk(KERN_INFO PFX
377 timeout); 389 "timeout value must be 1 <= x <= 3600, using %d\n",
390 timeout);
378 } 391 }
379 392
380 rc = register_reboot_notifier(&wdt_notifier); 393 rc = register_reboot_notifier(&wdt_notifier);
381 if (rc) { 394 if (rc) {
382 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", 395 printk(KERN_ERR PFX
383 rc); 396 "cannot register reboot notifier (err=%d)\n", rc);
384 goto err_out; 397 goto err_out;
385 } 398 }
386 399
@@ -391,9 +404,8 @@ static int __init alim7101_wdt_init(void)
391 goto err_out_reboot; 404 goto err_out_reboot;
392 } 405 }
393 406
394 if (nowayout) { 407 if (nowayout)
395 __module_get(THIS_MODULE); 408 __module_get(THIS_MODULE);
396 }
397 409
398 printk(KERN_INFO PFX "WDT driver for ALi M7101 initialised. timeout=%d sec (nowayout=%d)\n", 410 printk(KERN_INFO PFX "WDT driver for ALi M7101 initialised. timeout=%d sec (nowayout=%d)\n",
399 timeout, nowayout); 411 timeout, nowayout);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-23 10:36:46 -0500