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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <linux/fs.h>
16 #include <linux/kernel.h>
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>
23 #include <linux/io.h>
24 #include <linux/uaccess.h>
25
26
27 enum {
28 ASMTYPE_UNKNOWN,
29 ASMTYPE_TOPAZ,
30 ASMTYPE_JASPER,
31 ASMTYPE_PEARL,
32 ASMTYPE_JUNIPER,
33 ASMTYPE_SPRUCE,
34 };
35
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
63 static bool nowayout = WATCHDOG_NOWAYOUT;
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;
71 static DEFINE_SPINLOCK(asr_lock);
72
__asr_toggle(void)73 static void __asr_toggle(void)
74 {
75 unsigned char reg;
76
77 reg = inb(asr_read_addr);
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);
87 }
88
asr_toggle(void)89 static void asr_toggle(void)
90 {
91 spin_lock(&asr_lock);
92 __asr_toggle();
93 spin_unlock(&asr_lock);
94 }
95
asr_enable(void)96 static void asr_enable(void)
97 {
98 unsigned char reg;
99
100 spin_lock(&asr_lock);
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 */
111 __asr_toggle();
112
113 reg = inb(asr_read_addr);
114 outb(reg & ~asr_disable_mask, asr_write_addr);
115 }
116 reg = inb(asr_read_addr);
117 spin_unlock(&asr_lock);
118 }
119
asr_disable(void)120 static void asr_disable(void)
121 {
122 unsigned char reg;
123
124 spin_lock(&asr_lock);
125 reg = inb(asr_read_addr);
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);
138 spin_unlock(&asr_lock);
139 }
140
asr_get_base_address(void)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:
150 /* SELECT SuperIO CHIP FOR QUERYING
151 (WRITE 0x07 TO BOTH 0x2E and 0x2F) */
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 ";
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 */
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
190 /* BUS 0, Slot 1F, fnc 0, offset 58 */
191
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);*/
200 #endif
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")) {
237 pr_err("address %#x already in use\n", asr_base);
238 return -EBUSY;
239 }
240
241 pr_info("found %sASR @ addr %#x\n", type, asr_base);
242
243 return 0;
244 }
245
246
asr_write(struct file * file,const char __user * buf,size_t count,loff_t * ppos)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
asr_ioctl(struct file * file,unsigned int cmd,unsigned long arg)270 static long asr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
271 {
272 static const struct watchdog_info ident = {
273 .options = WDIOF_KEEPALIVEPING |
274 WDIOF_MAGICCLOSE,
275 .identity = "IBM ASR",
276 };
277 void __user *argp = (void __user *)arg;
278 int __user *p = argp;
279 int heartbeat;
280
281 switch (cmd) {
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);
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();
298 asr_toggle();
299 retval = 0;
300 }
301 return retval;
302 }
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);
313 default:
314 return -ENOTTY;
315 }
316 }
317
asr_open(struct inode * inode,struct file * file)318 static int asr_open(struct inode *inode, struct file *file)
319 {
320 if (test_and_set_bit(0, &asr_is_open))
321 return -EBUSY;
322
323 asr_toggle();
324 asr_enable();
325
326 return stream_open(inode, file);
327 }
328
asr_release(struct inode * inode,struct file * file)329 static int asr_release(struct inode *inode, struct file *file)
330 {
331 if (asr_expect_close == 42)
332 asr_disable();
333 else {
334 pr_crit("unexpected close, not stopping watchdog!\n");
335 asr_toggle();
336 }
337 clear_bit(0, &asr_is_open);
338 asr_expect_close = 0;
339 return 0;
340 }
341
342 static const struct file_operations asr_fops = {
343 .owner = THIS_MODULE,
344 .llseek = no_llseek,
345 .write = asr_write,
346 .unlocked_ioctl = asr_ioctl,
347 .open = asr_open,
348 .release = asr_release,
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 ibmasr_id_table[] __initdata = {
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
ibmasr_init(void)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
387 rc = asr_get_base_address();
388 if (rc)
389 return rc;
390
391 rc = misc_register(&asr_miscdev);
392 if (rc < 0) {
393 release_region(asr_base, asr_length);
394 pr_err("failed to register misc device\n");
395 return rc;
396 }
397
398 return 0;
399 }
400
ibmasr_exit(void)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
414 module_param(nowayout, bool, 0);
415 MODULE_PARM_DESC(nowayout,
416 "Watchdog cannot be stopped once started (default="
417 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
418
419 MODULE_DESCRIPTION("IBM Automatic Server Restart driver");
420 MODULE_AUTHOR("Andrey Panin");
421 MODULE_LICENSE("GPL");
422