Merge commit 'v2.6.27-rc8' into oprofile
[linux-2.6] / drivers / watchdog / ibmasr.c
1 /*
2  * IBM Automatic Server Restart driver.
3  *
4  * Copyright (c) 2005 Andrey Panin <pazke@donpac.ru>
5  *
6  * Based on driver written by Pete Reynolds.
7  * Copyright (c) IBM Corporation, 1998-2004.
8  *
9  * This software may be used and distributed according to the terms
10  * of the GNU Public License, incorporated herein by reference.
11  */
12
13 #include <linux/fs.h>
14 #include <linux/kernel.h>
15 #include <linux/slab.h>
16 #include <linux/module.h>
17 #include <linux/pci.h>
18 #include <linux/timer.h>
19 #include <linux/miscdevice.h>
20 #include <linux/watchdog.h>
21 #include <linux/dmi.h>
22 #include <linux/io.h>
23 #include <linux/uaccess.h>
24
25
26 enum {
27         ASMTYPE_UNKNOWN,
28         ASMTYPE_TOPAZ,
29         ASMTYPE_JASPER,
30         ASMTYPE_PEARL,
31         ASMTYPE_JUNIPER,
32         ASMTYPE_SPRUCE,
33 };
34
35 #define PFX "ibmasr: "
36
37 #define TOPAZ_ASR_REG_OFFSET    4
38 #define TOPAZ_ASR_TOGGLE        0x40
39 #define TOPAZ_ASR_DISABLE       0x80
40
41 /* PEARL ASR S/W REGISTER SUPERIO PORT ADDRESSES */
42 #define PEARL_BASE      0xe04
43 #define PEARL_WRITE     0xe06
44 #define PEARL_READ      0xe07
45
46 #define PEARL_ASR_DISABLE_MASK  0x80    /* bit 7: disable = 1, enable = 0 */
47 #define PEARL_ASR_TOGGLE_MASK   0x40    /* bit 6: 0, then 1, then 0 */
48
49 /* JASPER OFFSET FROM SIO BASE ADDR TO ASR S/W REGISTERS. */
50 #define JASPER_ASR_REG_OFFSET   0x38
51
52 #define JASPER_ASR_DISABLE_MASK 0x01    /* bit 0: disable = 1, enable = 0 */
53 #define JASPER_ASR_TOGGLE_MASK  0x02    /* bit 1: 0, then 1, then 0 */
54
55 #define JUNIPER_BASE_ADDRESS    0x54b   /* Base address of Juniper ASR */
56 #define JUNIPER_ASR_DISABLE_MASK 0x01   /* bit 0: disable = 1 enable = 0 */
57 #define JUNIPER_ASR_TOGGLE_MASK 0x02    /* bit 1: 0, then 1, then 0 */
58
59 #define SPRUCE_BASE_ADDRESS     0x118e  /* Base address of Spruce ASR */
60 #define SPRUCE_ASR_DISABLE_MASK 0x01    /* bit 1: disable = 1 enable = 0 */
61 #define SPRUCE_ASR_TOGGLE_MASK  0x02    /* bit 0: 0, then 1, then 0 */
62
63
64 static int nowayout = WATCHDOG_NOWAYOUT;
65
66 static unsigned long asr_is_open;
67 static char asr_expect_close;
68
69 static unsigned int asr_type, asr_base, asr_length;
70 static unsigned int asr_read_addr, asr_write_addr;
71 static unsigned char asr_toggle_mask, asr_disable_mask;
72 static spinlock_t asr_lock;
73
74 static void __asr_toggle(void)
75 {
76         unsigned char reg;
77
78         reg = inb(asr_read_addr);
79
80         outb(reg & ~asr_toggle_mask, asr_write_addr);
81         reg = inb(asr_read_addr);
82
83         outb(reg | asr_toggle_mask, asr_write_addr);
84         reg = inb(asr_read_addr);
85
86         outb(reg & ~asr_toggle_mask, asr_write_addr);
87         reg = inb(asr_read_addr);
88 }
89
90 static void asr_toggle(void)
91 {
92         spin_lock(&asr_lock);
93         __asr_toggle();
94         spin_unlock(&asr_lock);
95 }
96
97 static void asr_enable(void)
98 {
99         unsigned char reg;
100
101         spin_lock(&asr_lock);
102         if (asr_type == ASMTYPE_TOPAZ) {
103                 /* asr_write_addr == asr_read_addr */
104                 reg = inb(asr_read_addr);
105                 outb(reg & ~(TOPAZ_ASR_TOGGLE | TOPAZ_ASR_DISABLE),
106                      asr_read_addr);
107         } else {
108                 /*
109                  * First make sure the hardware timer is reset by toggling
110                  * ASR hardware timer line.
111                  */
112                 __asr_toggle();
113
114                 reg = inb(asr_read_addr);
115                 outb(reg & ~asr_disable_mask, asr_write_addr);
116         }
117         reg = inb(asr_read_addr);
118         spin_unlock(&asr_lock);
119 }
120
121 static void asr_disable(void)
122 {
123         unsigned char reg;
124
125         spin_lock(&asr_lock);
126         reg = inb(asr_read_addr);
127
128         if (asr_type == ASMTYPE_TOPAZ)
129                 /* asr_write_addr == asr_read_addr */
130                 outb(reg | TOPAZ_ASR_TOGGLE | TOPAZ_ASR_DISABLE,
131                      asr_read_addr);
132         else {
133                 outb(reg | asr_toggle_mask, asr_write_addr);
134                 reg = inb(asr_read_addr);
135
136                 outb(reg | asr_disable_mask, asr_write_addr);
137         }
138         reg = inb(asr_read_addr);
139         spin_unlock(&asr_lock);
140 }
141
142 static int __init asr_get_base_address(void)
143 {
144         unsigned char low, high;
145         const char *type = "";
146
147         asr_length = 1;
148
149         switch (asr_type) {
150         case ASMTYPE_TOPAZ:
151                 /* SELECT SuperIO CHIP FOR QUERYING
152                    (WRITE 0x07 TO BOTH 0x2E and 0x2F) */
153                 outb(0x07, 0x2e);
154                 outb(0x07, 0x2f);
155
156                 /* SELECT AND READ THE HIGH-NIBBLE OF THE GPIO BASE ADDRESS */
157                 outb(0x60, 0x2e);
158                 high = inb(0x2f);
159
160                 /* SELECT AND READ THE LOW-NIBBLE OF THE GPIO BASE ADDRESS */
161                 outb(0x61, 0x2e);
162                 low = inb(0x2f);
163
164                 asr_base = (high << 16) | low;
165                 asr_read_addr = asr_write_addr =
166                         asr_base + TOPAZ_ASR_REG_OFFSET;
167                 asr_length = 5;
168
169                 break;
170
171         case ASMTYPE_JASPER:
172                 type = "Jaspers ";
173 #if 0
174                 u32 r;
175                 /* Suggested fix */
176                 pdev = pci_get_bus_and_slot(0, DEVFN(0x1f, 0));
177                 if (pdev == NULL)
178                         return -ENODEV;
179                 pci_read_config_dword(pdev, 0x58, &r);
180                 asr_base = r & 0xFFFE;
181                 pci_dev_put(pdev);
182 #else
183                 /* FIXME: need to use pci_config_lock here,
184                    but it's not exported */
185
186 /*              spin_lock_irqsave(&pci_config_lock, flags);*/
187
188                 /* Select the SuperIO chip in the PCI I/O port register */
189                 outl(0x8000f858, 0xcf8);
190
191                 /* BUS 0, Slot 1F, fnc 0, offset 58 */
192
193                 /*
194                  * Read the base address for the SuperIO chip.
195                  * Only the lower 16 bits are valid, but the address is word
196                  * aligned so the last bit must be masked off.
197                  */
198                 asr_base = inl(0xcfc) & 0xfffe;
199
200 /*              spin_unlock_irqrestore(&pci_config_lock, flags);*/
201 #endif
202                 asr_read_addr = asr_write_addr =
203                         asr_base + JASPER_ASR_REG_OFFSET;
204                 asr_toggle_mask = JASPER_ASR_TOGGLE_MASK;
205                 asr_disable_mask = JASPER_ASR_DISABLE_MASK;
206                 asr_length = JASPER_ASR_REG_OFFSET + 1;
207
208                 break;
209
210         case ASMTYPE_PEARL:
211                 type = "Pearls ";
212                 asr_base = PEARL_BASE;
213                 asr_read_addr = PEARL_READ;
214                 asr_write_addr = PEARL_WRITE;
215                 asr_toggle_mask = PEARL_ASR_TOGGLE_MASK;
216                 asr_disable_mask = PEARL_ASR_DISABLE_MASK;
217                 asr_length = 4;
218                 break;
219
220         case ASMTYPE_JUNIPER:
221                 type = "Junipers ";
222                 asr_base = JUNIPER_BASE_ADDRESS;
223                 asr_read_addr = asr_write_addr = asr_base;
224                 asr_toggle_mask = JUNIPER_ASR_TOGGLE_MASK;
225                 asr_disable_mask = JUNIPER_ASR_DISABLE_MASK;
226                 break;
227
228         case ASMTYPE_SPRUCE:
229                 type = "Spruce's ";
230                 asr_base = SPRUCE_BASE_ADDRESS;
231                 asr_read_addr = asr_write_addr = asr_base;
232                 asr_toggle_mask = SPRUCE_ASR_TOGGLE_MASK;
233                 asr_disable_mask = SPRUCE_ASR_DISABLE_MASK;
234                 break;
235         }
236
237         if (!request_region(asr_base, asr_length, "ibmasr")) {
238                 printk(KERN_ERR PFX "address %#x already in use\n",
239                         asr_base);
240                 return -EBUSY;
241         }
242
243         printk(KERN_INFO PFX "found %sASR @ addr %#x\n", type, asr_base);
244
245         return 0;
246 }
247
248
249 static ssize_t asr_write(struct file *file, const char __user *buf,
250                          size_t count, loff_t *ppos)
251 {
252         if (count) {
253                 if (!nowayout) {
254                         size_t i;
255
256                         /* In case it was set long ago */
257                         asr_expect_close = 0;
258
259                         for (i = 0; i != count; i++) {
260                                 char c;
261                                 if (get_user(c, buf + i))
262                                         return -EFAULT;
263                                 if (c == 'V')
264                                         asr_expect_close = 42;
265                         }
266                 }
267                 asr_toggle();
268         }
269         return count;
270 }
271
272 static long asr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
273 {
274         static const struct watchdog_info ident = {
275                 .options =      WDIOF_KEEPALIVEPING |
276                                 WDIOF_MAGICCLOSE,
277                 .identity =     "IBM ASR",
278         };
279         void __user *argp = (void __user *)arg;
280         int __user *p = argp;
281         int heartbeat;
282
283         switch (cmd) {
284         case WDIOC_GETSUPPORT:
285                 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
286         case WDIOC_GETSTATUS:
287         case WDIOC_GETBOOTSTATUS:
288                 return put_user(0, p);
289         case WDIOC_SETOPTIONS:
290         {
291                 int new_options, retval = -EINVAL;
292                 if (get_user(new_options, p))
293                         return -EFAULT;
294                 if (new_options & WDIOS_DISABLECARD) {
295                         asr_disable();
296                         retval = 0;
297                 }
298                 if (new_options & WDIOS_ENABLECARD) {
299                         asr_enable();
300                         asr_toggle();
301                         retval = 0;
302                 }
303                 return retval;
304         }
305         case WDIOC_KEEPALIVE:
306                 asr_toggle();
307                 return 0;
308         /*
309          * The hardware has a fixed timeout value, so no WDIOC_SETTIMEOUT
310          * and WDIOC_GETTIMEOUT always returns 256.
311          */
312         case WDIOC_GETTIMEOUT:
313                 heartbeat = 256;
314                 return put_user(heartbeat, p);
315         default:
316                 return -ENOTTY;
317         }
318 }
319
320 static int asr_open(struct inode *inode, struct file *file)
321 {
322         if (test_and_set_bit(0, &asr_is_open))
323                 return -EBUSY;
324
325         asr_toggle();
326         asr_enable();
327
328         return nonseekable_open(inode, file);
329 }
330
331 static int asr_release(struct inode *inode, struct file *file)
332 {
333         if (asr_expect_close == 42)
334                 asr_disable();
335         else {
336                 printk(KERN_CRIT PFX
337                                 "unexpected close, not stopping watchdog!\n");
338                 asr_toggle();
339         }
340         clear_bit(0, &asr_is_open);
341         asr_expect_close = 0;
342         return 0;
343 }
344
345 static const struct file_operations asr_fops = {
346         .owner =                THIS_MODULE,
347         .llseek =               no_llseek,
348         .write =                asr_write,
349         .unlocked_ioctl =       asr_ioctl,
350         .open =                 asr_open,
351         .release =              asr_release,
352 };
353
354 static struct miscdevice asr_miscdev = {
355         .minor =        WATCHDOG_MINOR,
356         .name =         "watchdog",
357         .fops =         &asr_fops,
358 };
359
360
361 struct ibmasr_id {
362         const char *desc;
363         int type;
364 };
365
366 static struct ibmasr_id __initdata ibmasr_id_table[] = {
367         { "IBM Automatic Server Restart - eserver xSeries 220", ASMTYPE_TOPAZ },
368         { "IBM Automatic Server Restart - Machine Type 8673", ASMTYPE_PEARL },
369         { "IBM Automatic Server Restart - Machine Type 8480", ASMTYPE_JASPER },
370         { "IBM Automatic Server Restart - Machine Type 8482", ASMTYPE_JUNIPER },
371         { "IBM Automatic Server Restart - Machine Type 8648", ASMTYPE_SPRUCE },
372         { NULL }
373 };
374
375 static int __init ibmasr_init(void)
376 {
377         struct ibmasr_id *id;
378         int rc;
379
380         for (id = ibmasr_id_table; id->desc; id++) {
381                 if (dmi_find_device(DMI_DEV_TYPE_OTHER, id->desc, NULL)) {
382                         asr_type = id->type;
383                         break;
384                 }
385         }
386
387         if (!asr_type)
388                 return -ENODEV;
389
390         spin_lock_init(&asr_lock);
391
392         rc = asr_get_base_address();
393         if (rc)
394                 return rc;
395
396         rc = misc_register(&asr_miscdev);
397         if (rc < 0) {
398                 release_region(asr_base, asr_length);
399                 printk(KERN_ERR PFX "failed to register misc device\n");
400                 return rc;
401         }
402
403         return 0;
404 }
405
406 static void __exit ibmasr_exit(void)
407 {
408         if (!nowayout)
409                 asr_disable();
410
411         misc_deregister(&asr_miscdev);
412
413         release_region(asr_base, asr_length);
414 }
415
416 module_init(ibmasr_init);
417 module_exit(ibmasr_exit);
418
419 module_param(nowayout, int, 0);
420 MODULE_PARM_DESC(nowayout,
421         "Watchdog cannot be stopped once started (default="
422                                 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
423
424 MODULE_DESCRIPTION("IBM Automatic Server Restart driver");
425 MODULE_AUTHOR("Andrey Panin");
426 MODULE_LICENSE("GPL");
427 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);