Commit | Line | Data |
---|---|---|
d532134d AP |
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 | ||
27c766aa JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
d532134d AP |
15 | #include <linux/fs.h> |
16 | #include <linux/kernel.h> | |
d532134d AP |
17 | #include <linux/module.h> |
18 | #include <linux/pci.h> | |
19 | #include <linux/timer.h> | |
20 | #include <linux/miscdevice.h> | |
21 | #include <linux/watchdog.h> | |
22 | #include <linux/dmi.h> | |
02355c32 AC |
23 | #include <linux/io.h> |
24 | #include <linux/uaccess.h> | |
d532134d AP |
25 | |
26 | ||
27 | enum { | |
28 | ASMTYPE_UNKNOWN, | |
29 | ASMTYPE_TOPAZ, | |
30 | ASMTYPE_JASPER, | |
31 | ASMTYPE_PEARL, | |
32 | ASMTYPE_JUNIPER, | |
33 | ASMTYPE_SPRUCE, | |
34 | }; | |
35 | ||
d532134d AP |
36 | #define TOPAZ_ASR_REG_OFFSET 4 |
37 | #define TOPAZ_ASR_TOGGLE 0x40 | |
38 | #define TOPAZ_ASR_DISABLE 0x80 | |
39 | ||
40 | /* PEARL ASR S/W REGISTER SUPERIO PORT ADDRESSES */ | |
41 | #define PEARL_BASE 0xe04 | |
42 | #define PEARL_WRITE 0xe06 | |
43 | #define PEARL_READ 0xe07 | |
44 | ||
45 | #define PEARL_ASR_DISABLE_MASK 0x80 /* bit 7: disable = 1, enable = 0 */ | |
46 | #define PEARL_ASR_TOGGLE_MASK 0x40 /* bit 6: 0, then 1, then 0 */ | |
47 | ||
48 | /* JASPER OFFSET FROM SIO BASE ADDR TO ASR S/W REGISTERS. */ | |
49 | #define JASPER_ASR_REG_OFFSET 0x38 | |
50 | ||
51 | #define JASPER_ASR_DISABLE_MASK 0x01 /* bit 0: disable = 1, enable = 0 */ | |
52 | #define JASPER_ASR_TOGGLE_MASK 0x02 /* bit 1: 0, then 1, then 0 */ | |
53 | ||
54 | #define JUNIPER_BASE_ADDRESS 0x54b /* Base address of Juniper ASR */ | |
55 | #define JUNIPER_ASR_DISABLE_MASK 0x01 /* bit 0: disable = 1 enable = 0 */ | |
56 | #define JUNIPER_ASR_TOGGLE_MASK 0x02 /* bit 1: 0, then 1, then 0 */ | |
57 | ||
58 | #define SPRUCE_BASE_ADDRESS 0x118e /* Base address of Spruce ASR */ | |
59 | #define SPRUCE_ASR_DISABLE_MASK 0x01 /* bit 1: disable = 1 enable = 0 */ | |
60 | #define SPRUCE_ASR_TOGGLE_MASK 0x02 /* bit 0: 0, then 1, then 0 */ | |
61 | ||
62 | ||
86a1e189 | 63 | static bool nowayout = WATCHDOG_NOWAYOUT; |
d532134d AP |
64 | |
65 | static unsigned long asr_is_open; | |
66 | static char asr_expect_close; | |
67 | ||
68 | static unsigned int asr_type, asr_base, asr_length; | |
69 | static unsigned int asr_read_addr, asr_write_addr; | |
70 | static unsigned char asr_toggle_mask, asr_disable_mask; | |
1334f329 | 71 | static DEFINE_SPINLOCK(asr_lock); |
d532134d | 72 | |
02355c32 | 73 | static void __asr_toggle(void) |
d532134d | 74 | { |
02355c32 AC |
75 | unsigned char reg; |
76 | ||
77 | reg = inb(asr_read_addr); | |
d532134d AP |
78 | |
79 | outb(reg & ~asr_toggle_mask, asr_write_addr); | |
80 | reg = inb(asr_read_addr); | |
81 | ||
82 | outb(reg | asr_toggle_mask, asr_write_addr); | |
83 | reg = inb(asr_read_addr); | |
84 | ||
85 | outb(reg & ~asr_toggle_mask, asr_write_addr); | |
86 | reg = inb(asr_read_addr); | |
02355c32 AC |
87 | } |
88 | ||
89 | static void asr_toggle(void) | |
90 | { | |
91 | spin_lock(&asr_lock); | |
92 | __asr_toggle(); | |
93 | spin_unlock(&asr_lock); | |
d532134d AP |
94 | } |
95 | ||
96 | static void asr_enable(void) | |
97 | { | |
98 | unsigned char reg; | |
99 | ||
02355c32 | 100 | spin_lock(&asr_lock); |
d532134d AP |
101 | if (asr_type == ASMTYPE_TOPAZ) { |
102 | /* asr_write_addr == asr_read_addr */ | |
103 | reg = inb(asr_read_addr); | |
104 | outb(reg & ~(TOPAZ_ASR_TOGGLE | TOPAZ_ASR_DISABLE), | |
105 | asr_read_addr); | |
106 | } else { | |
107 | /* | |
108 | * First make sure the hardware timer is reset by toggling | |
109 | * ASR hardware timer line. | |
110 | */ | |
02355c32 | 111 | __asr_toggle(); |
d532134d AP |
112 | |
113 | reg = inb(asr_read_addr); | |
114 | outb(reg & ~asr_disable_mask, asr_write_addr); | |
115 | } | |
116 | reg = inb(asr_read_addr); | |
02355c32 | 117 | spin_unlock(&asr_lock); |
d532134d AP |
118 | } |
119 | ||
120 | static void asr_disable(void) | |
121 | { | |
02355c32 AC |
122 | unsigned char reg; |
123 | ||
124 | spin_lock(&asr_lock); | |
125 | reg = inb(asr_read_addr); | |
d532134d AP |
126 | |
127 | if (asr_type == ASMTYPE_TOPAZ) | |
128 | /* asr_write_addr == asr_read_addr */ | |
129 | outb(reg | TOPAZ_ASR_TOGGLE | TOPAZ_ASR_DISABLE, | |
130 | asr_read_addr); | |
131 | else { | |
132 | outb(reg | asr_toggle_mask, asr_write_addr); | |
133 | reg = inb(asr_read_addr); | |
134 | ||
135 | outb(reg | asr_disable_mask, asr_write_addr); | |
136 | } | |
137 | reg = inb(asr_read_addr); | |
02355c32 | 138 | spin_unlock(&asr_lock); |
d532134d AP |
139 | } |
140 | ||
141 | static int __init asr_get_base_address(void) | |
142 | { | |
143 | unsigned char low, high; | |
144 | const char *type = ""; | |
145 | ||
146 | asr_length = 1; | |
147 | ||
148 | switch (asr_type) { | |
149 | case ASMTYPE_TOPAZ: | |
02355c32 AC |
150 | /* SELECT SuperIO CHIP FOR QUERYING |
151 | (WRITE 0x07 TO BOTH 0x2E and 0x2F) */ | |
d532134d AP |
152 | outb(0x07, 0x2e); |
153 | outb(0x07, 0x2f); | |
154 | ||
155 | /* SELECT AND READ THE HIGH-NIBBLE OF THE GPIO BASE ADDRESS */ | |
156 | outb(0x60, 0x2e); | |
157 | high = inb(0x2f); | |
158 | ||
159 | /* SELECT AND READ THE LOW-NIBBLE OF THE GPIO BASE ADDRESS */ | |
160 | outb(0x61, 0x2e); | |
161 | low = inb(0x2f); | |
162 | ||
163 | asr_base = (high << 16) | low; | |
164 | asr_read_addr = asr_write_addr = | |
165 | asr_base + TOPAZ_ASR_REG_OFFSET; | |
166 | asr_length = 5; | |
167 | ||
168 | break; | |
169 | ||
170 | case ASMTYPE_JASPER: | |
171 | type = "Jaspers "; | |
02355c32 AC |
172 | #if 0 |
173 | u32 r; | |
174 | /* Suggested fix */ | |
175 | pdev = pci_get_bus_and_slot(0, DEVFN(0x1f, 0)); | |
176 | if (pdev == NULL) | |
177 | return -ENODEV; | |
178 | pci_read_config_dword(pdev, 0x58, &r); | |
179 | asr_base = r & 0xFFFE; | |
180 | pci_dev_put(pdev); | |
181 | #else | |
182 | /* FIXME: need to use pci_config_lock here, | |
183 | but it's not exported */ | |
d532134d AP |
184 | |
185 | /* spin_lock_irqsave(&pci_config_lock, flags);*/ | |
186 | ||
187 | /* Select the SuperIO chip in the PCI I/O port register */ | |
188 | outl(0x8000f858, 0xcf8); | |
189 | ||
02355c32 AC |
190 | /* BUS 0, Slot 1F, fnc 0, offset 58 */ |
191 | ||
d532134d AP |
192 | /* |
193 | * Read the base address for the SuperIO chip. | |
194 | * Only the lower 16 bits are valid, but the address is word | |
195 | * aligned so the last bit must be masked off. | |
196 | */ | |
197 | asr_base = inl(0xcfc) & 0xfffe; | |
198 | ||
199 | /* spin_unlock_irqrestore(&pci_config_lock, flags);*/ | |
02355c32 | 200 | #endif |
d532134d AP |
201 | asr_read_addr = asr_write_addr = |
202 | asr_base + JASPER_ASR_REG_OFFSET; | |
203 | asr_toggle_mask = JASPER_ASR_TOGGLE_MASK; | |
204 | asr_disable_mask = JASPER_ASR_DISABLE_MASK; | |
205 | asr_length = JASPER_ASR_REG_OFFSET + 1; | |
206 | ||
207 | break; | |
208 | ||
209 | case ASMTYPE_PEARL: | |
210 | type = "Pearls "; | |
211 | asr_base = PEARL_BASE; | |
212 | asr_read_addr = PEARL_READ; | |
213 | asr_write_addr = PEARL_WRITE; | |
214 | asr_toggle_mask = PEARL_ASR_TOGGLE_MASK; | |
215 | asr_disable_mask = PEARL_ASR_DISABLE_MASK; | |
216 | asr_length = 4; | |
217 | break; | |
218 | ||
219 | case ASMTYPE_JUNIPER: | |
220 | type = "Junipers "; | |
221 | asr_base = JUNIPER_BASE_ADDRESS; | |
222 | asr_read_addr = asr_write_addr = asr_base; | |
223 | asr_toggle_mask = JUNIPER_ASR_TOGGLE_MASK; | |
224 | asr_disable_mask = JUNIPER_ASR_DISABLE_MASK; | |
225 | break; | |
226 | ||
227 | case ASMTYPE_SPRUCE: | |
228 | type = "Spruce's "; | |
229 | asr_base = SPRUCE_BASE_ADDRESS; | |
230 | asr_read_addr = asr_write_addr = asr_base; | |
231 | asr_toggle_mask = SPRUCE_ASR_TOGGLE_MASK; | |
232 | asr_disable_mask = SPRUCE_ASR_DISABLE_MASK; | |
233 | break; | |
234 | } | |
235 | ||
236 | if (!request_region(asr_base, asr_length, "ibmasr")) { | |
27c766aa | 237 | pr_err("address %#x already in use\n", asr_base); |
d532134d AP |
238 | return -EBUSY; |
239 | } | |
240 | ||
27c766aa | 241 | pr_info("found %sASR @ addr %#x\n", type, asr_base); |
d532134d AP |
242 | |
243 | return 0; | |
244 | } | |
245 | ||
246 | ||
247 | static ssize_t asr_write(struct file *file, const char __user *buf, | |
248 | size_t count, loff_t *ppos) | |
249 | { | |
250 | if (count) { | |
251 | if (!nowayout) { | |
252 | size_t i; | |
253 | ||
254 | /* In case it was set long ago */ | |
255 | asr_expect_close = 0; | |
256 | ||
257 | for (i = 0; i != count; i++) { | |
258 | char c; | |
259 | if (get_user(c, buf + i)) | |
260 | return -EFAULT; | |
261 | if (c == 'V') | |
262 | asr_expect_close = 42; | |
263 | } | |
264 | } | |
265 | asr_toggle(); | |
266 | } | |
267 | return count; | |
268 | } | |
269 | ||
02355c32 | 270 | static long asr_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
d532134d AP |
271 | { |
272 | static const struct watchdog_info ident = { | |
02355c32 | 273 | .options = WDIOF_KEEPALIVEPING | |
d532134d | 274 | WDIOF_MAGICCLOSE, |
7944d3a5 | 275 | .identity = "IBM ASR", |
d532134d AP |
276 | }; |
277 | void __user *argp = (void __user *)arg; | |
278 | int __user *p = argp; | |
279 | int heartbeat; | |
280 | ||
281 | switch (cmd) { | |
02355c32 AC |
282 | case WDIOC_GETSUPPORT: |
283 | return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; | |
284 | case WDIOC_GETSTATUS: | |
285 | case WDIOC_GETBOOTSTATUS: | |
286 | return put_user(0, p); | |
02355c32 AC |
287 | case WDIOC_SETOPTIONS: |
288 | { | |
289 | int new_options, retval = -EINVAL; | |
290 | if (get_user(new_options, p)) | |
291 | return -EFAULT; | |
292 | if (new_options & WDIOS_DISABLECARD) { | |
293 | asr_disable(); | |
294 | retval = 0; | |
295 | } | |
296 | if (new_options & WDIOS_ENABLECARD) { | |
297 | asr_enable(); | |
d532134d | 298 | asr_toggle(); |
02355c32 | 299 | retval = 0; |
d532134d | 300 | } |
02355c32 AC |
301 | return retval; |
302 | } | |
0c06090c WVS |
303 | case WDIOC_KEEPALIVE: |
304 | asr_toggle(); | |
305 | return 0; | |
306 | /* | |
307 | * The hardware has a fixed timeout value, so no WDIOC_SETTIMEOUT | |
308 | * and WDIOC_GETTIMEOUT always returns 256. | |
309 | */ | |
310 | case WDIOC_GETTIMEOUT: | |
311 | heartbeat = 256; | |
312 | return put_user(heartbeat, p); | |
02355c32 AC |
313 | default: |
314 | return -ENOTTY; | |
d532134d | 315 | } |
d532134d AP |
316 | } |
317 | ||
318 | static int asr_open(struct inode *inode, struct file *file) | |
319 | { | |
02355c32 | 320 | if (test_and_set_bit(0, &asr_is_open)) |
d532134d AP |
321 | return -EBUSY; |
322 | ||
323 | asr_toggle(); | |
324 | asr_enable(); | |
325 | ||
326 | return nonseekable_open(inode, file); | |
327 | } | |
328 | ||
329 | static int asr_release(struct inode *inode, struct file *file) | |
330 | { | |
331 | if (asr_expect_close == 42) | |
332 | asr_disable(); | |
333 | else { | |
27c766aa | 334 | pr_crit("unexpected close, not stopping watchdog!\n"); |
d532134d AP |
335 | asr_toggle(); |
336 | } | |
337 | clear_bit(0, &asr_is_open); | |
338 | asr_expect_close = 0; | |
339 | return 0; | |
340 | } | |
341 | ||
62322d25 | 342 | static const struct file_operations asr_fops = { |
02355c32 | 343 | .owner = THIS_MODULE, |
7944d3a5 | 344 | .llseek = no_llseek, |
02355c32 AC |
345 | .write = asr_write, |
346 | .unlocked_ioctl = asr_ioctl, | |
347 | .open = asr_open, | |
348 | .release = asr_release, | |
d532134d AP |
349 | }; |
350 | ||
351 | static struct miscdevice asr_miscdev = { | |
352 | .minor = WATCHDOG_MINOR, | |
353 | .name = "watchdog", | |
354 | .fops = &asr_fops, | |
355 | }; | |
356 | ||
357 | ||
358 | struct ibmasr_id { | |
359 | const char *desc; | |
360 | int type; | |
361 | }; | |
362 | ||
363 | static struct ibmasr_id __initdata ibmasr_id_table[] = { | |
364 | { "IBM Automatic Server Restart - eserver xSeries 220", ASMTYPE_TOPAZ }, | |
365 | { "IBM Automatic Server Restart - Machine Type 8673", ASMTYPE_PEARL }, | |
366 | { "IBM Automatic Server Restart - Machine Type 8480", ASMTYPE_JASPER }, | |
367 | { "IBM Automatic Server Restart - Machine Type 8482", ASMTYPE_JUNIPER }, | |
368 | { "IBM Automatic Server Restart - Machine Type 8648", ASMTYPE_SPRUCE }, | |
369 | { NULL } | |
370 | }; | |
371 | ||
372 | static int __init ibmasr_init(void) | |
373 | { | |
374 | struct ibmasr_id *id; | |
375 | int rc; | |
376 | ||
377 | for (id = ibmasr_id_table; id->desc; id++) { | |
378 | if (dmi_find_device(DMI_DEV_TYPE_OTHER, id->desc, NULL)) { | |
379 | asr_type = id->type; | |
380 | break; | |
381 | } | |
382 | } | |
383 | ||
384 | if (!asr_type) | |
385 | return -ENODEV; | |
386 | ||
fb8f7ba0 AD |
387 | rc = asr_get_base_address(); |
388 | if (rc) | |
389 | return rc; | |
390 | ||
d532134d AP |
391 | rc = misc_register(&asr_miscdev); |
392 | if (rc < 0) { | |
fb8f7ba0 | 393 | release_region(asr_base, asr_length); |
27c766aa | 394 | pr_err("failed to register misc device\n"); |
d532134d AP |
395 | return rc; |
396 | } | |
397 | ||
d532134d AP |
398 | return 0; |
399 | } | |
400 | ||
401 | static void __exit ibmasr_exit(void) | |
402 | { | |
403 | if (!nowayout) | |
404 | asr_disable(); | |
405 | ||
406 | misc_deregister(&asr_miscdev); | |
407 | ||
408 | release_region(asr_base, asr_length); | |
409 | } | |
410 | ||
411 | module_init(ibmasr_init); | |
412 | module_exit(ibmasr_exit); | |
413 | ||
86a1e189 | 414 | module_param(nowayout, bool, 0); |
02355c32 AC |
415 | MODULE_PARM_DESC(nowayout, |
416 | "Watchdog cannot be stopped once started (default=" | |
417 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
d532134d AP |
418 | |
419 | MODULE_DESCRIPTION("IBM Automatic Server Restart driver"); | |
420 | MODULE_AUTHOR("Andrey Panin"); | |
421 | MODULE_LICENSE("GPL"); |