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Andrey Panind5321342005-08-19 23:15:11 +02001/*
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
Andrey Panind5321342005-08-19 23:15:11 +020013#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
23#include <asm/io.h>
24#include <asm/uaccess.h>
25
26
27enum {
28 ASMTYPE_UNKNOWN,
29 ASMTYPE_TOPAZ,
30 ASMTYPE_JASPER,
31 ASMTYPE_PEARL,
32 ASMTYPE_JUNIPER,
33 ASMTYPE_SPRUCE,
34};
35
36#define PFX "ibmasr: "
37
38#define TOPAZ_ASR_REG_OFFSET 4
39#define TOPAZ_ASR_TOGGLE 0x40
40#define TOPAZ_ASR_DISABLE 0x80
41
42/* PEARL ASR S/W REGISTER SUPERIO PORT ADDRESSES */
43#define PEARL_BASE 0xe04
44#define PEARL_WRITE 0xe06
45#define PEARL_READ 0xe07
46
47#define PEARL_ASR_DISABLE_MASK 0x80 /* bit 7: disable = 1, enable = 0 */
48#define PEARL_ASR_TOGGLE_MASK 0x40 /* bit 6: 0, then 1, then 0 */
49
50/* JASPER OFFSET FROM SIO BASE ADDR TO ASR S/W REGISTERS. */
51#define JASPER_ASR_REG_OFFSET 0x38
52
53#define JASPER_ASR_DISABLE_MASK 0x01 /* bit 0: disable = 1, enable = 0 */
54#define JASPER_ASR_TOGGLE_MASK 0x02 /* bit 1: 0, then 1, then 0 */
55
56#define JUNIPER_BASE_ADDRESS 0x54b /* Base address of Juniper ASR */
57#define JUNIPER_ASR_DISABLE_MASK 0x01 /* bit 0: disable = 1 enable = 0 */
58#define JUNIPER_ASR_TOGGLE_MASK 0x02 /* bit 1: 0, then 1, then 0 */
59
60#define SPRUCE_BASE_ADDRESS 0x118e /* Base address of Spruce ASR */
61#define SPRUCE_ASR_DISABLE_MASK 0x01 /* bit 1: disable = 1 enable = 0 */
62#define SPRUCE_ASR_TOGGLE_MASK 0x02 /* bit 0: 0, then 1, then 0 */
63
64
65static int nowayout = WATCHDOG_NOWAYOUT;
66
67static unsigned long asr_is_open;
68static char asr_expect_close;
69
70static unsigned int asr_type, asr_base, asr_length;
71static unsigned int asr_read_addr, asr_write_addr;
72static unsigned char asr_toggle_mask, asr_disable_mask;
73
74static void asr_toggle(void)
75{
76 unsigned char reg = inb(asr_read_addr);
77
78 outb(reg & ~asr_toggle_mask, asr_write_addr);
79 reg = inb(asr_read_addr);
80
81 outb(reg | asr_toggle_mask, asr_write_addr);
82 reg = inb(asr_read_addr);
83
84 outb(reg & ~asr_toggle_mask, asr_write_addr);
85 reg = inb(asr_read_addr);
86}
87
88static void asr_enable(void)
89{
90 unsigned char reg;
91
92 if (asr_type == ASMTYPE_TOPAZ) {
93 /* asr_write_addr == asr_read_addr */
94 reg = inb(asr_read_addr);
95 outb(reg & ~(TOPAZ_ASR_TOGGLE | TOPAZ_ASR_DISABLE),
96 asr_read_addr);
97 } else {
98 /*
99 * First make sure the hardware timer is reset by toggling
100 * ASR hardware timer line.
101 */
102 asr_toggle();
103
104 reg = inb(asr_read_addr);
105 outb(reg & ~asr_disable_mask, asr_write_addr);
106 }
107 reg = inb(asr_read_addr);
108}
109
110static void asr_disable(void)
111{
112 unsigned char reg = inb(asr_read_addr);
113
114 if (asr_type == ASMTYPE_TOPAZ)
115 /* asr_write_addr == asr_read_addr */
116 outb(reg | TOPAZ_ASR_TOGGLE | TOPAZ_ASR_DISABLE,
117 asr_read_addr);
118 else {
119 outb(reg | asr_toggle_mask, asr_write_addr);
120 reg = inb(asr_read_addr);
121
122 outb(reg | asr_disable_mask, asr_write_addr);
123 }
124 reg = inb(asr_read_addr);
125}
126
127static int __init asr_get_base_address(void)
128{
129 unsigned char low, high;
130 const char *type = "";
131
132 asr_length = 1;
133
134 switch (asr_type) {
135 case ASMTYPE_TOPAZ:
136 /* SELECT SuperIO CHIP FOR QUERYING (WRITE 0x07 TO BOTH 0x2E and 0x2F) */
137 outb(0x07, 0x2e);
138 outb(0x07, 0x2f);
139
140 /* SELECT AND READ THE HIGH-NIBBLE OF THE GPIO BASE ADDRESS */
141 outb(0x60, 0x2e);
142 high = inb(0x2f);
143
144 /* SELECT AND READ THE LOW-NIBBLE OF THE GPIO BASE ADDRESS */
145 outb(0x61, 0x2e);
146 low = inb(0x2f);
147
148 asr_base = (high << 16) | low;
149 asr_read_addr = asr_write_addr =
150 asr_base + TOPAZ_ASR_REG_OFFSET;
151 asr_length = 5;
152
153 break;
154
155 case ASMTYPE_JASPER:
156 type = "Jaspers ";
157
158 /* FIXME: need to use pci_config_lock here, but it's not exported */
159
160/* spin_lock_irqsave(&pci_config_lock, flags);*/
161
162 /* Select the SuperIO chip in the PCI I/O port register */
163 outl(0x8000f858, 0xcf8);
164
165 /*
166 * Read the base address for the SuperIO chip.
167 * Only the lower 16 bits are valid, but the address is word
168 * aligned so the last bit must be masked off.
169 */
170 asr_base = inl(0xcfc) & 0xfffe;
171
172/* spin_unlock_irqrestore(&pci_config_lock, flags);*/
173
174 asr_read_addr = asr_write_addr =
175 asr_base + JASPER_ASR_REG_OFFSET;
176 asr_toggle_mask = JASPER_ASR_TOGGLE_MASK;
177 asr_disable_mask = JASPER_ASR_DISABLE_MASK;
178 asr_length = JASPER_ASR_REG_OFFSET + 1;
179
180 break;
181
182 case ASMTYPE_PEARL:
183 type = "Pearls ";
184 asr_base = PEARL_BASE;
185 asr_read_addr = PEARL_READ;
186 asr_write_addr = PEARL_WRITE;
187 asr_toggle_mask = PEARL_ASR_TOGGLE_MASK;
188 asr_disable_mask = PEARL_ASR_DISABLE_MASK;
189 asr_length = 4;
190 break;
191
192 case ASMTYPE_JUNIPER:
193 type = "Junipers ";
194 asr_base = JUNIPER_BASE_ADDRESS;
195 asr_read_addr = asr_write_addr = asr_base;
196 asr_toggle_mask = JUNIPER_ASR_TOGGLE_MASK;
197 asr_disable_mask = JUNIPER_ASR_DISABLE_MASK;
198 break;
199
200 case ASMTYPE_SPRUCE:
201 type = "Spruce's ";
202 asr_base = SPRUCE_BASE_ADDRESS;
203 asr_read_addr = asr_write_addr = asr_base;
204 asr_toggle_mask = SPRUCE_ASR_TOGGLE_MASK;
205 asr_disable_mask = SPRUCE_ASR_DISABLE_MASK;
206 break;
207 }
208
209 if (!request_region(asr_base, asr_length, "ibmasr")) {
210 printk(KERN_ERR PFX "address %#x already in use\n",
211 asr_base);
212 return -EBUSY;
213 }
214
215 printk(KERN_INFO PFX "found %sASR @ addr %#x\n", type, asr_base);
216
217 return 0;
218}
219
220
221static ssize_t asr_write(struct file *file, const char __user *buf,
222 size_t count, loff_t *ppos)
223{
224 if (count) {
225 if (!nowayout) {
226 size_t i;
227
228 /* In case it was set long ago */
229 asr_expect_close = 0;
230
231 for (i = 0; i != count; i++) {
232 char c;
233 if (get_user(c, buf + i))
234 return -EFAULT;
235 if (c == 'V')
236 asr_expect_close = 42;
237 }
238 }
239 asr_toggle();
240 }
241 return count;
242}
243
244static int asr_ioctl(struct inode *inode, struct file *file,
245 unsigned int cmd, unsigned long arg)
246{
247 static const struct watchdog_info ident = {
Wim Van Sebroeck266aa1c2005-08-19 23:31:41 +0200248 .options = WDIOF_KEEPALIVEPING |
Andrey Panind5321342005-08-19 23:15:11 +0200249 WDIOF_MAGICCLOSE,
250 .identity = "IBM ASR"
251 };
252 void __user *argp = (void __user *)arg;
253 int __user *p = argp;
254 int heartbeat;
255
256 switch (cmd) {
257 case WDIOC_GETSUPPORT:
258 return copy_to_user(argp, &ident, sizeof(ident)) ?
259 -EFAULT : 0;
260
261 case WDIOC_GETSTATUS:
262 case WDIOC_GETBOOTSTATUS:
263 return put_user(0, p);
264
265 case WDIOC_KEEPALIVE:
266 asr_toggle();
267 return 0;
268
Andrew Mortoncd7b8002005-08-19 23:21:01 +0200269 /*
Wim Van Sebroeck266aa1c2005-08-19 23:31:41 +0200270 * The hardware has a fixed timeout value, so no WDIOC_SETTIMEOUT
271 * and WDIOC_GETTIMEOUT always returns 256.
Andrew Mortoncd7b8002005-08-19 23:21:01 +0200272 */
Andrey Panind5321342005-08-19 23:15:11 +0200273 case WDIOC_GETTIMEOUT:
274 heartbeat = 256;
275 return put_user(heartbeat, p);
276
277 case WDIOC_SETOPTIONS: {
278 int new_options, retval = -EINVAL;
279
280 if (get_user(new_options, p))
281 return -EFAULT;
282
283 if (new_options & WDIOS_DISABLECARD) {
284 asr_disable();
285 retval = 0;
286 }
287
288 if (new_options & WDIOS_ENABLECARD) {
289 asr_enable();
290 asr_toggle();
291 retval = 0;
292 }
293
294 return retval;
295 }
296 }
297
298 return -ENOIOCTLCMD;
299}
300
301static int asr_open(struct inode *inode, struct file *file)
302{
303 if(test_and_set_bit(0, &asr_is_open))
304 return -EBUSY;
305
306 asr_toggle();
307 asr_enable();
308
309 return nonseekable_open(inode, file);
310}
311
312static int asr_release(struct inode *inode, struct file *file)
313{
314 if (asr_expect_close == 42)
315 asr_disable();
316 else {
317 printk(KERN_CRIT PFX "unexpected close, not stopping watchdog!\n");
318 asr_toggle();
319 }
320 clear_bit(0, &asr_is_open);
321 asr_expect_close = 0;
322 return 0;
323}
324
Arjan van de Ven62322d22006-07-03 00:24:21 -0700325static const struct file_operations asr_fops = {
Andrey Panind5321342005-08-19 23:15:11 +0200326 .owner = THIS_MODULE,
327 .llseek = no_llseek,
328 .write = asr_write,
329 .ioctl = asr_ioctl,
330 .open = asr_open,
331 .release = asr_release,
332};
333
334static struct miscdevice asr_miscdev = {
335 .minor = WATCHDOG_MINOR,
336 .name = "watchdog",
337 .fops = &asr_fops,
338};
339
340
341struct ibmasr_id {
342 const char *desc;
343 int type;
344};
345
346static struct ibmasr_id __initdata ibmasr_id_table[] = {
347 { "IBM Automatic Server Restart - eserver xSeries 220", ASMTYPE_TOPAZ },
348 { "IBM Automatic Server Restart - Machine Type 8673", ASMTYPE_PEARL },
349 { "IBM Automatic Server Restart - Machine Type 8480", ASMTYPE_JASPER },
350 { "IBM Automatic Server Restart - Machine Type 8482", ASMTYPE_JUNIPER },
351 { "IBM Automatic Server Restart - Machine Type 8648", ASMTYPE_SPRUCE },
352 { NULL }
353};
354
355static int __init ibmasr_init(void)
356{
357 struct ibmasr_id *id;
358 int rc;
359
360 for (id = ibmasr_id_table; id->desc; id++) {
361 if (dmi_find_device(DMI_DEV_TYPE_OTHER, id->desc, NULL)) {
362 asr_type = id->type;
363 break;
364 }
365 }
366
367 if (!asr_type)
368 return -ENODEV;
369
370 rc = misc_register(&asr_miscdev);
371 if (rc < 0) {
372 printk(KERN_ERR PFX "failed to register misc device\n");
373 return rc;
374 }
375
376 rc = asr_get_base_address();
377 if (rc) {
378 misc_deregister(&asr_miscdev);
379 return rc;
380 }
381
382 return 0;
383}
384
385static void __exit ibmasr_exit(void)
386{
387 if (!nowayout)
388 asr_disable();
389
390 misc_deregister(&asr_miscdev);
391
392 release_region(asr_base, asr_length);
393}
394
395module_init(ibmasr_init);
396module_exit(ibmasr_exit);
397
398module_param(nowayout, int, 0);
399MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
400
401MODULE_DESCRIPTION("IBM Automatic Server Restart driver");
402MODULE_AUTHOR("Andrey Panin");
403MODULE_LICENSE("GPL");
404MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);