Commit | Line | Data |
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9e0ea345 | 1 | /* |
cb711a19 | 2 | * intel TCO Watchdog Driver |
9e0ea345 | 3 | * |
deb9197b | 4 | * (c) Copyright 2006-2011 Wim Van Sebroeck <wim@iguana.be>. |
9e0ea345 WVS |
5 | * |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor | |
12 | * provide warranty for any of this software. This material is | |
13 | * provided "AS-IS" and at no charge. | |
14 | * | |
15 | * The TCO watchdog is implemented in the following I/O controller hubs: | |
16 | * (See the intel documentation on http://developer.intel.com.) | |
cb711a19 WVS |
17 | * document number 290655-003, 290677-014: 82801AA (ICH), 82801AB (ICHO) |
18 | * document number 290687-002, 298242-027: 82801BA (ICH2) | |
19 | * document number 290733-003, 290739-013: 82801CA (ICH3-S) | |
20 | * document number 290716-001, 290718-007: 82801CAM (ICH3-M) | |
21 | * document number 290744-001, 290745-025: 82801DB (ICH4) | |
22 | * document number 252337-001, 252663-008: 82801DBM (ICH4-M) | |
23 | * document number 273599-001, 273645-002: 82801E (C-ICH) | |
24 | * document number 252516-001, 252517-028: 82801EB (ICH5), 82801ER (ICH5R) | |
25 | * document number 300641-004, 300884-013: 6300ESB | |
26 | * document number 301473-002, 301474-026: 82801F (ICH6) | |
27 | * document number 313082-001, 313075-006: 631xESB, 632xESB | |
28 | * document number 307013-003, 307014-024: 82801G (ICH7) | |
d38bd479 | 29 | * document number 322896-001, 322897-001: NM10 |
cb711a19 WVS |
30 | * document number 313056-003, 313057-017: 82801H (ICH8) |
31 | * document number 316972-004, 316973-012: 82801I (ICH9) | |
32 | * document number 319973-002, 319974-002: 82801J (ICH10) | |
3c9d8ecc | 33 | * document number 322169-001, 322170-003: 5 Series, 3400 Series (PCH) |
4946f835 | 34 | * document number 320066-003, 320257-008: EP80597 (IICH) |
203f8d89 | 35 | * document number 324645-001, 324646-001: Cougar Point (CPT) |
c54fb811 | 36 | * document number TBD : Patsburg (PBG) |
203f8d89 | 37 | * document number TBD : DH89xxCC |
aa1f4652 | 38 | * document number TBD : Panther Point |
84e83c28 | 39 | * document number TBD : Lynx Point |
7fb9c1a4 | 40 | * document number TBD : Lynx Point-LP |
9e0ea345 WVS |
41 | */ |
42 | ||
43 | /* | |
44 | * Includes, defines, variables, module parameters, ... | |
45 | */ | |
46 | ||
27c766aa JP |
47 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
48 | ||
9e0ea345 | 49 | /* Module and version information */ |
7944d3a5 | 50 | #define DRV_NAME "iTCO_wdt" |
24b3a167 | 51 | #define DRV_VERSION "1.11" |
9e0ea345 WVS |
52 | |
53 | /* Includes */ | |
f321c9cb | 54 | #include <linux/acpi.h> /* For ACPI support */ |
3836cc0f WVS |
55 | #include <linux/module.h> /* For module specific items */ |
56 | #include <linux/moduleparam.h> /* For new moduleparam's */ | |
57 | #include <linux/types.h> /* For standard types (like size_t) */ | |
58 | #include <linux/errno.h> /* For the -ENODEV/... values */ | |
59 | #include <linux/kernel.h> /* For printk/panic/... */ | |
3836cc0f | 60 | #include <linux/watchdog.h> /* For the watchdog specific items */ |
3836cc0f WVS |
61 | #include <linux/init.h> /* For __init/__exit/... */ |
62 | #include <linux/fs.h> /* For file operations */ | |
63 | #include <linux/platform_device.h> /* For platform_driver framework */ | |
64 | #include <linux/pci.h> /* For pci functions */ | |
65 | #include <linux/ioport.h> /* For io-port access */ | |
66 | #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ | |
0e6fa3fb AC |
67 | #include <linux/uaccess.h> /* For copy_to_user/put_user/... */ |
68 | #include <linux/io.h> /* For inb/outb/... */ | |
420b54de | 69 | #include <linux/platform_data/itco_wdt.h> |
3836cc0f | 70 | |
0e6fa3fb | 71 | #include "iTCO_vendor.h" |
9e0ea345 | 72 | |
9e0ea345 | 73 | /* Address definitions for the TCO */ |
0e6fa3fb | 74 | /* TCO base address */ |
ce1b95ca | 75 | #define TCOBASE(p) ((p)->tco_res->start) |
0e6fa3fb | 76 | /* SMI Control and Enable Register */ |
ce1b95ca GR |
77 | #define SMI_EN(p) ((p)->smi_res->start) |
78 | ||
79 | #define TCO_RLD(p) (TCOBASE(p) + 0x00) /* TCO Timer Reload/Curr. Value */ | |
80 | #define TCOv1_TMR(p) (TCOBASE(p) + 0x01) /* TCOv1 Timer Initial Value*/ | |
81 | #define TCO_DAT_IN(p) (TCOBASE(p) + 0x02) /* TCO Data In Register */ | |
82 | #define TCO_DAT_OUT(p) (TCOBASE(p) + 0x03) /* TCO Data Out Register */ | |
83 | #define TCO1_STS(p) (TCOBASE(p) + 0x04) /* TCO1 Status Register */ | |
84 | #define TCO2_STS(p) (TCOBASE(p) + 0x06) /* TCO2 Status Register */ | |
85 | #define TCO1_CNT(p) (TCOBASE(p) + 0x08) /* TCO1 Control Register */ | |
86 | #define TCO2_CNT(p) (TCOBASE(p) + 0x0a) /* TCO2 Control Register */ | |
87 | #define TCOv2_TMR(p) (TCOBASE(p) + 0x12) /* TCOv2 Timer Initial Value*/ | |
9e0ea345 WVS |
88 | |
89 | /* internal variables */ | |
ce1b95ca GR |
90 | struct iTCO_wdt_private { |
91 | struct watchdog_device wddev; | |
92 | ||
0e6fa3fb AC |
93 | /* TCO version/generation */ |
94 | unsigned int iTCO_version; | |
887c8ec7 AS |
95 | struct resource *tco_res; |
96 | struct resource *smi_res; | |
24b3a167 PT |
97 | /* |
98 | * NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2), | |
99 | * or memory-mapped PMC register bit 4 (TCO version 3). | |
100 | */ | |
101 | struct resource *gcs_pmc_res; | |
102 | unsigned long __iomem *gcs_pmc; | |
0e6fa3fb AC |
103 | /* the lock for io operations */ |
104 | spinlock_t io_lock; | |
105 | /* the PCI-device */ | |
78e45696 | 106 | struct pci_dev *pci_dev; |
f321c9cb RW |
107 | /* whether or not the watchdog has been suspended */ |
108 | bool suspended; | |
ce1b95ca | 109 | }; |
9e0ea345 WVS |
110 | |
111 | /* module parameters */ | |
bff23431 WVS |
112 | #define WATCHDOG_TIMEOUT 30 /* 30 sec default heartbeat */ |
113 | static int heartbeat = WATCHDOG_TIMEOUT; /* in seconds */ | |
9e0ea345 | 114 | module_param(heartbeat, int, 0); |
7e6811da PB |
115 | MODULE_PARM_DESC(heartbeat, "Watchdog timeout in seconds. " |
116 | "5..76 (TCO v1) or 3..614 (TCO v2), default=" | |
bff23431 | 117 | __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); |
9e0ea345 | 118 | |
86a1e189 WVS |
119 | static bool nowayout = WATCHDOG_NOWAYOUT; |
120 | module_param(nowayout, bool, 0); | |
0e6fa3fb AC |
121 | MODULE_PARM_DESC(nowayout, |
122 | "Watchdog cannot be stopped once started (default=" | |
123 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
e033351d | 124 | |
0d098587 | 125 | static int turn_SMI_watchdog_clear_off = 1; |
deb9197b WVS |
126 | module_param(turn_SMI_watchdog_clear_off, int, 0); |
127 | MODULE_PARM_DESC(turn_SMI_watchdog_clear_off, | |
0d098587 | 128 | "Turn off SMI clearing watchdog (depends on TCO-version)(default=1)"); |
deb9197b | 129 | |
9e0ea345 WVS |
130 | /* |
131 | * Some TCO specific functions | |
132 | */ | |
133 | ||
24b3a167 PT |
134 | /* |
135 | * The iTCO v1 and v2's internal timer is stored as ticks which decrement | |
136 | * every 0.6 seconds. v3's internal timer is stored as seconds (some | |
137 | * datasheets incorrectly state 0.6 seconds). | |
138 | */ | |
ce1b95ca GR |
139 | static inline unsigned int seconds_to_ticks(struct iTCO_wdt_private *p, |
140 | int secs) | |
9e0ea345 | 141 | { |
ce1b95ca | 142 | return p->iTCO_version == 3 ? secs : (secs * 10) / 6; |
24b3a167 PT |
143 | } |
144 | ||
ce1b95ca GR |
145 | static inline unsigned int ticks_to_seconds(struct iTCO_wdt_private *p, |
146 | int ticks) | |
24b3a167 | 147 | { |
ce1b95ca | 148 | return p->iTCO_version == 3 ? ticks : (ticks * 6) / 10; |
9e0ea345 WVS |
149 | } |
150 | ||
ce1b95ca | 151 | static inline u32 no_reboot_bit(struct iTCO_wdt_private *p) |
2a7a0e9b MF |
152 | { |
153 | u32 enable_bit; | |
154 | ||
ce1b95ca | 155 | switch (p->iTCO_version) { |
3b3a1c8f | 156 | case 5: |
2a7a0e9b MF |
157 | case 3: |
158 | enable_bit = 0x00000010; | |
159 | break; | |
160 | case 2: | |
161 | enable_bit = 0x00000020; | |
162 | break; | |
163 | case 4: | |
164 | case 1: | |
165 | default: | |
166 | enable_bit = 0x00000002; | |
167 | break; | |
168 | } | |
169 | ||
170 | return enable_bit; | |
171 | } | |
172 | ||
ce1b95ca | 173 | static void iTCO_wdt_set_NO_REBOOT_bit(struct iTCO_wdt_private *p) |
9e0ea345 WVS |
174 | { |
175 | u32 val32; | |
176 | ||
177 | /* Set the NO_REBOOT bit: this disables reboots */ | |
ce1b95ca GR |
178 | if (p->iTCO_version >= 2) { |
179 | val32 = readl(p->gcs_pmc); | |
180 | val32 |= no_reboot_bit(p); | |
181 | writel(val32, p->gcs_pmc); | |
182 | } else if (p->iTCO_version == 1) { | |
78e45696 | 183 | pci_read_config_dword(p->pci_dev, 0xd4, &val32); |
ce1b95ca | 184 | val32 |= no_reboot_bit(p); |
78e45696 | 185 | pci_write_config_dword(p->pci_dev, 0xd4, val32); |
9e0ea345 WVS |
186 | } |
187 | } | |
188 | ||
ce1b95ca | 189 | static int iTCO_wdt_unset_NO_REBOOT_bit(struct iTCO_wdt_private *p) |
9e0ea345 | 190 | { |
ce1b95ca | 191 | u32 enable_bit = no_reboot_bit(p); |
2a7a0e9b | 192 | u32 val32 = 0; |
9e0ea345 WVS |
193 | |
194 | /* Unset the NO_REBOOT bit: this enables reboots */ | |
ce1b95ca GR |
195 | if (p->iTCO_version >= 2) { |
196 | val32 = readl(p->gcs_pmc); | |
2a7a0e9b | 197 | val32 &= ~enable_bit; |
ce1b95ca | 198 | writel(val32, p->gcs_pmc); |
9e0ea345 | 199 | |
ce1b95ca GR |
200 | val32 = readl(p->gcs_pmc); |
201 | } else if (p->iTCO_version == 1) { | |
78e45696 | 202 | pci_read_config_dword(p->pci_dev, 0xd4, &val32); |
2a7a0e9b | 203 | val32 &= ~enable_bit; |
78e45696 | 204 | pci_write_config_dword(p->pci_dev, 0xd4, val32); |
9e0ea345 | 205 | |
78e45696 | 206 | pci_read_config_dword(p->pci_dev, 0xd4, &val32); |
9e0ea345 WVS |
207 | } |
208 | ||
2a7a0e9b MF |
209 | if (val32 & enable_bit) |
210 | return -EIO; | |
211 | ||
212 | return 0; | |
9e0ea345 WVS |
213 | } |
214 | ||
bff23431 | 215 | static int iTCO_wdt_start(struct watchdog_device *wd_dev) |
9e0ea345 | 216 | { |
ce1b95ca | 217 | struct iTCO_wdt_private *p = watchdog_get_drvdata(wd_dev); |
9e0ea345 WVS |
218 | unsigned int val; |
219 | ||
ce1b95ca | 220 | spin_lock(&p->io_lock); |
9e0ea345 | 221 | |
ce1b95ca | 222 | iTCO_vendor_pre_start(p->smi_res, wd_dev->timeout); |
e033351d | 223 | |
9e0ea345 | 224 | /* disable chipset's NO_REBOOT bit */ |
ce1b95ca GR |
225 | if (iTCO_wdt_unset_NO_REBOOT_bit(p)) { |
226 | spin_unlock(&p->io_lock); | |
27c766aa | 227 | pr_err("failed to reset NO_REBOOT flag, reboot disabled by hardware/BIOS\n"); |
9e0ea345 WVS |
228 | return -EIO; |
229 | } | |
230 | ||
7cd5b08b WVS |
231 | /* Force the timer to its reload value by writing to the TCO_RLD |
232 | register */ | |
ce1b95ca GR |
233 | if (p->iTCO_version >= 2) |
234 | outw(0x01, TCO_RLD(p)); | |
235 | else if (p->iTCO_version == 1) | |
236 | outb(0x01, TCO_RLD(p)); | |
7cd5b08b | 237 | |
9e0ea345 | 238 | /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */ |
ce1b95ca | 239 | val = inw(TCO1_CNT(p)); |
9e0ea345 | 240 | val &= 0xf7ff; |
ce1b95ca GR |
241 | outw(val, TCO1_CNT(p)); |
242 | val = inw(TCO1_CNT(p)); | |
243 | spin_unlock(&p->io_lock); | |
9e0ea345 WVS |
244 | |
245 | if (val & 0x0800) | |
246 | return -1; | |
247 | return 0; | |
248 | } | |
249 | ||
bff23431 | 250 | static int iTCO_wdt_stop(struct watchdog_device *wd_dev) |
9e0ea345 | 251 | { |
ce1b95ca | 252 | struct iTCO_wdt_private *p = watchdog_get_drvdata(wd_dev); |
9e0ea345 WVS |
253 | unsigned int val; |
254 | ||
ce1b95ca | 255 | spin_lock(&p->io_lock); |
9e0ea345 | 256 | |
ce1b95ca | 257 | iTCO_vendor_pre_stop(p->smi_res); |
e033351d | 258 | |
9e0ea345 | 259 | /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */ |
ce1b95ca | 260 | val = inw(TCO1_CNT(p)); |
9e0ea345 | 261 | val |= 0x0800; |
ce1b95ca GR |
262 | outw(val, TCO1_CNT(p)); |
263 | val = inw(TCO1_CNT(p)); | |
9e0ea345 WVS |
264 | |
265 | /* Set the NO_REBOOT bit to prevent later reboots, just for sure */ | |
ce1b95ca | 266 | iTCO_wdt_set_NO_REBOOT_bit(p); |
9e0ea345 | 267 | |
ce1b95ca | 268 | spin_unlock(&p->io_lock); |
9e0ea345 WVS |
269 | |
270 | if ((val & 0x0800) == 0) | |
271 | return -1; | |
272 | return 0; | |
273 | } | |
274 | ||
bff23431 | 275 | static int iTCO_wdt_ping(struct watchdog_device *wd_dev) |
9e0ea345 | 276 | { |
ce1b95ca | 277 | struct iTCO_wdt_private *p = watchdog_get_drvdata(wd_dev); |
9e0ea345 | 278 | |
ce1b95ca GR |
279 | spin_lock(&p->io_lock); |
280 | ||
281 | iTCO_vendor_pre_keepalive(p->smi_res, wd_dev->timeout); | |
e033351d | 282 | |
9e0ea345 | 283 | /* Reload the timer by writing to the TCO Timer Counter register */ |
ce1b95ca GR |
284 | if (p->iTCO_version >= 2) { |
285 | outw(0x01, TCO_RLD(p)); | |
286 | } else if (p->iTCO_version == 1) { | |
7e6811da PB |
287 | /* Reset the timeout status bit so that the timer |
288 | * needs to count down twice again before rebooting */ | |
ce1b95ca | 289 | outw(0x0008, TCO1_STS(p)); /* write 1 to clear bit */ |
7e6811da | 290 | |
ce1b95ca | 291 | outb(0x01, TCO_RLD(p)); |
7e6811da | 292 | } |
9e0ea345 | 293 | |
ce1b95ca | 294 | spin_unlock(&p->io_lock); |
9e0ea345 WVS |
295 | return 0; |
296 | } | |
297 | ||
bff23431 | 298 | static int iTCO_wdt_set_timeout(struct watchdog_device *wd_dev, unsigned int t) |
9e0ea345 | 299 | { |
ce1b95ca | 300 | struct iTCO_wdt_private *p = watchdog_get_drvdata(wd_dev); |
9e0ea345 WVS |
301 | unsigned int val16; |
302 | unsigned char val8; | |
303 | unsigned int tmrval; | |
304 | ||
ce1b95ca | 305 | tmrval = seconds_to_ticks(p, t); |
7e6811da PB |
306 | |
307 | /* For TCO v1 the timer counts down twice before rebooting */ | |
ce1b95ca | 308 | if (p->iTCO_version == 1) |
7e6811da PB |
309 | tmrval /= 2; |
310 | ||
9e0ea345 WVS |
311 | /* from the specs: */ |
312 | /* "Values of 0h-3h are ignored and should not be attempted" */ | |
313 | if (tmrval < 0x04) | |
314 | return -EINVAL; | |
ce1b95ca GR |
315 | if ((p->iTCO_version >= 2 && tmrval > 0x3ff) || |
316 | (p->iTCO_version == 1 && tmrval > 0x03f)) | |
9e0ea345 WVS |
317 | return -EINVAL; |
318 | ||
e033351d WVS |
319 | iTCO_vendor_pre_set_heartbeat(tmrval); |
320 | ||
9e0ea345 | 321 | /* Write new heartbeat to watchdog */ |
ce1b95ca GR |
322 | if (p->iTCO_version >= 2) { |
323 | spin_lock(&p->io_lock); | |
324 | val16 = inw(TCOv2_TMR(p)); | |
9e0ea345 WVS |
325 | val16 &= 0xfc00; |
326 | val16 |= tmrval; | |
ce1b95ca GR |
327 | outw(val16, TCOv2_TMR(p)); |
328 | val16 = inw(TCOv2_TMR(p)); | |
329 | spin_unlock(&p->io_lock); | |
9e0ea345 WVS |
330 | |
331 | if ((val16 & 0x3ff) != tmrval) | |
332 | return -EINVAL; | |
ce1b95ca GR |
333 | } else if (p->iTCO_version == 1) { |
334 | spin_lock(&p->io_lock); | |
335 | val8 = inb(TCOv1_TMR(p)); | |
9e0ea345 WVS |
336 | val8 &= 0xc0; |
337 | val8 |= (tmrval & 0xff); | |
ce1b95ca GR |
338 | outb(val8, TCOv1_TMR(p)); |
339 | val8 = inb(TCOv1_TMR(p)); | |
340 | spin_unlock(&p->io_lock); | |
9e0ea345 WVS |
341 | |
342 | if ((val8 & 0x3f) != tmrval) | |
343 | return -EINVAL; | |
344 | } | |
345 | ||
bff23431 | 346 | wd_dev->timeout = t; |
9e0ea345 WVS |
347 | return 0; |
348 | } | |
349 | ||
bff23431 | 350 | static unsigned int iTCO_wdt_get_timeleft(struct watchdog_device *wd_dev) |
9e0ea345 | 351 | { |
ce1b95ca | 352 | struct iTCO_wdt_private *p = watchdog_get_drvdata(wd_dev); |
9e0ea345 WVS |
353 | unsigned int val16; |
354 | unsigned char val8; | |
bff23431 | 355 | unsigned int time_left = 0; |
9e0ea345 WVS |
356 | |
357 | /* read the TCO Timer */ | |
ce1b95ca GR |
358 | if (p->iTCO_version >= 2) { |
359 | spin_lock(&p->io_lock); | |
360 | val16 = inw(TCO_RLD(p)); | |
9e0ea345 | 361 | val16 &= 0x3ff; |
ce1b95ca | 362 | spin_unlock(&p->io_lock); |
9e0ea345 | 363 | |
ce1b95ca GR |
364 | time_left = ticks_to_seconds(p, val16); |
365 | } else if (p->iTCO_version == 1) { | |
366 | spin_lock(&p->io_lock); | |
367 | val8 = inb(TCO_RLD(p)); | |
9e0ea345 | 368 | val8 &= 0x3f; |
ce1b95ca GR |
369 | if (!(inw(TCO1_STS(p)) & 0x0008)) |
370 | val8 += (inb(TCOv1_TMR(p)) & 0x3f); | |
371 | spin_unlock(&p->io_lock); | |
9e0ea345 | 372 | |
ce1b95ca | 373 | time_left = ticks_to_seconds(p, val8); |
9e0ea345 | 374 | } |
bff23431 | 375 | return time_left; |
9e0ea345 WVS |
376 | } |
377 | ||
9e0ea345 WVS |
378 | /* |
379 | * Kernel Interfaces | |
380 | */ | |
381 | ||
bff23431 WVS |
382 | static const struct watchdog_info ident = { |
383 | .options = WDIOF_SETTIMEOUT | | |
384 | WDIOF_KEEPALIVEPING | | |
385 | WDIOF_MAGICCLOSE, | |
386 | .firmware_version = 0, | |
387 | .identity = DRV_NAME, | |
388 | }; | |
389 | ||
390 | static const struct watchdog_ops iTCO_wdt_ops = { | |
0e6fa3fb | 391 | .owner = THIS_MODULE, |
bff23431 | 392 | .start = iTCO_wdt_start, |
5f5e1909 JH |
393 | .stop = iTCO_wdt_stop, |
394 | .ping = iTCO_wdt_ping, | |
bff23431 WVS |
395 | .set_timeout = iTCO_wdt_set_timeout, |
396 | .get_timeleft = iTCO_wdt_get_timeleft, | |
9e0ea345 WVS |
397 | }; |
398 | ||
9e0ea345 WVS |
399 | /* |
400 | * Init & exit routines | |
401 | */ | |
402 | ||
78e45696 | 403 | static int iTCO_wdt_probe(struct platform_device *pdev) |
9e0ea345 | 404 | { |
78e45696 GR |
405 | struct device *dev = &pdev->dev; |
406 | struct itco_wdt_platform_data *pdata = dev_get_platdata(dev); | |
ce1b95ca GR |
407 | struct iTCO_wdt_private *p; |
408 | unsigned long val32; | |
409 | int ret; | |
887c8ec7 | 410 | |
420b54de | 411 | if (!pdata) |
ce1b95ca | 412 | return -ENODEV; |
887c8ec7 | 413 | |
78e45696 | 414 | p = devm_kzalloc(dev, sizeof(*p), GFP_KERNEL); |
ce1b95ca GR |
415 | if (!p) |
416 | return -ENOMEM; | |
887c8ec7 | 417 | |
ce1b95ca | 418 | spin_lock_init(&p->io_lock); |
887c8ec7 | 419 | |
78e45696 | 420 | p->tco_res = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_IO_TCO); |
ce1b95ca GR |
421 | if (!p->tco_res) |
422 | return -ENODEV; | |
887c8ec7 | 423 | |
78e45696 | 424 | p->smi_res = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_IO_SMI); |
ce1b95ca GR |
425 | if (!p->smi_res) |
426 | return -ENODEV; | |
427 | ||
428 | p->iTCO_version = pdata->version; | |
78e45696 | 429 | p->pci_dev = to_pci_dev(dev->parent); |
9e0ea345 WVS |
430 | |
431 | /* | |
24b3a167 PT |
432 | * Get the Memory-Mapped GCS or PMC register, we need it for the |
433 | * NO_REBOOT flag (TCO v2 and v3). | |
9e0ea345 | 434 | */ |
ce1b95ca | 435 | if (p->iTCO_version >= 2) { |
78e45696 | 436 | p->gcs_pmc_res = platform_get_resource(pdev, |
ce1b95ca GR |
437 | IORESOURCE_MEM, |
438 | ICH_RES_MEM_GCS_PMC); | |
78e45696 | 439 | p->gcs_pmc = devm_ioremap_resource(dev, p->gcs_pmc_res); |
c7bbcc87 GR |
440 | if (IS_ERR(p->gcs_pmc)) |
441 | return PTR_ERR(p->gcs_pmc); | |
9e0ea345 WVS |
442 | } |
443 | ||
444 | /* Check chipset's NO_REBOOT bit */ | |
ce1b95ca GR |
445 | if (iTCO_wdt_unset_NO_REBOOT_bit(p) && |
446 | iTCO_vendor_check_noreboot_on()) { | |
27c766aa | 447 | pr_info("unable to reset NO_REBOOT flag, device disabled by hardware/BIOS\n"); |
c7bbcc87 | 448 | return -ENODEV; /* Cannot reset NO_REBOOT bit */ |
9e0ea345 WVS |
449 | } |
450 | ||
451 | /* Set the NO_REBOOT bit to prevent later reboots, just for sure */ | |
ce1b95ca | 452 | iTCO_wdt_set_NO_REBOOT_bit(p); |
9e0ea345 | 453 | |
7cd5b08b | 454 | /* The TCO logic uses the TCO_EN bit in the SMI_EN register */ |
78e45696 | 455 | if (!devm_request_region(dev, p->smi_res->start, |
c7bbcc87 | 456 | resource_size(p->smi_res), |
78e45696 | 457 | pdev->name)) { |
887c8ec7 | 458 | pr_err("I/O address 0x%04llx already in use, device disabled\n", |
ce1b95ca | 459 | (u64)SMI_EN(p)); |
c7bbcc87 | 460 | return -EBUSY; |
9e0ea345 | 461 | } |
ce1b95ca | 462 | if (turn_SMI_watchdog_clear_off >= p->iTCO_version) { |
887c8ec7 AS |
463 | /* |
464 | * Bit 13: TCO_EN -> 0 | |
465 | * Disables TCO logic generating an SMI# | |
466 | */ | |
ce1b95ca | 467 | val32 = inl(SMI_EN(p)); |
deb9197b | 468 | val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */ |
ce1b95ca | 469 | outl(val32, SMI_EN(p)); |
deb9197b | 470 | } |
9e0ea345 | 471 | |
78e45696 | 472 | if (!devm_request_region(dev, p->tco_res->start, |
c7bbcc87 | 473 | resource_size(p->tco_res), |
78e45696 | 474 | pdev->name)) { |
887c8ec7 | 475 | pr_err("I/O address 0x%04llx already in use, device disabled\n", |
ce1b95ca | 476 | (u64)TCOBASE(p)); |
c7bbcc87 | 477 | return -EBUSY; |
9e0ea345 WVS |
478 | } |
479 | ||
887c8ec7 | 480 | pr_info("Found a %s TCO device (Version=%d, TCOBASE=0x%04llx)\n", |
ce1b95ca | 481 | pdata->name, pdata->version, (u64)TCOBASE(p)); |
9e0ea345 WVS |
482 | |
483 | /* Clear out the (probably old) status */ | |
ce1b95ca | 484 | switch (p->iTCO_version) { |
3b3a1c8f | 485 | case 5: |
2a7a0e9b | 486 | case 4: |
ce1b95ca GR |
487 | outw(0x0008, TCO1_STS(p)); /* Clear the Time Out Status bit */ |
488 | outw(0x0002, TCO2_STS(p)); /* Clear SECOND_TO_STS bit */ | |
2a7a0e9b MF |
489 | break; |
490 | case 3: | |
ce1b95ca | 491 | outl(0x20008, TCO1_STS(p)); |
2a7a0e9b MF |
492 | break; |
493 | case 2: | |
494 | case 1: | |
495 | default: | |
ce1b95ca GR |
496 | outw(0x0008, TCO1_STS(p)); /* Clear the Time Out Status bit */ |
497 | outw(0x0002, TCO2_STS(p)); /* Clear SECOND_TO_STS bit */ | |
498 | outw(0x0004, TCO2_STS(p)); /* Clear BOOT_STS bit */ | |
2a7a0e9b | 499 | break; |
24b3a167 | 500 | } |
9e0ea345 | 501 | |
ce1b95ca GR |
502 | p->wddev.info = &ident, |
503 | p->wddev.ops = &iTCO_wdt_ops, | |
504 | p->wddev.bootstatus = 0; | |
505 | p->wddev.timeout = WATCHDOG_TIMEOUT; | |
506 | watchdog_set_nowayout(&p->wddev, nowayout); | |
78e45696 | 507 | p->wddev.parent = dev; |
ce1b95ca GR |
508 | |
509 | watchdog_set_drvdata(&p->wddev, p); | |
78e45696 | 510 | platform_set_drvdata(pdev, p); |
bff23431 | 511 | |
9e0ea345 | 512 | /* Make sure the watchdog is not running */ |
ce1b95ca | 513 | iTCO_wdt_stop(&p->wddev); |
9e0ea345 | 514 | |
0e6fa3fb AC |
515 | /* Check that the heartbeat value is within it's range; |
516 | if not reset to the default */ | |
ce1b95ca GR |
517 | if (iTCO_wdt_set_timeout(&p->wddev, heartbeat)) { |
518 | iTCO_wdt_set_timeout(&p->wddev, WATCHDOG_TIMEOUT); | |
bff23431 WVS |
519 | pr_info("timeout value out of range, using %d\n", |
520 | WATCHDOG_TIMEOUT); | |
9e0ea345 WVS |
521 | } |
522 | ||
78e45696 | 523 | ret = devm_watchdog_register_device(dev, &p->wddev); |
9e0ea345 | 524 | if (ret != 0) { |
bff23431 | 525 | pr_err("cannot register watchdog device (err=%d)\n", ret); |
c7bbcc87 | 526 | return ret; |
9e0ea345 WVS |
527 | } |
528 | ||
27c766aa JP |
529 | pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n", |
530 | heartbeat, nowayout); | |
9e0ea345 WVS |
531 | |
532 | return 0; | |
9e0ea345 WVS |
533 | } |
534 | ||
78e45696 | 535 | static int iTCO_wdt_remove(struct platform_device *pdev) |
9e0ea345 | 536 | { |
78e45696 | 537 | struct iTCO_wdt_private *p = platform_get_drvdata(pdev); |
ce1b95ca | 538 | |
c7bbcc87 GR |
539 | /* Stop the timer before we leave */ |
540 | if (!nowayout) | |
541 | iTCO_wdt_stop(&p->wddev); | |
9e0ea345 | 542 | |
3836cc0f WVS |
543 | return 0; |
544 | } | |
545 | ||
78e45696 | 546 | static void iTCO_wdt_shutdown(struct platform_device *pdev) |
3836cc0f | 547 | { |
78e45696 | 548 | struct iTCO_wdt_private *p = platform_get_drvdata(pdev); |
ce1b95ca GR |
549 | |
550 | iTCO_wdt_stop(&p->wddev); | |
3836cc0f WVS |
551 | } |
552 | ||
f321c9cb RW |
553 | #ifdef CONFIG_PM_SLEEP |
554 | /* | |
555 | * Suspend-to-idle requires this, because it stops the ticks and timekeeping, so | |
556 | * the watchdog cannot be pinged while in that state. In ACPI sleep states the | |
557 | * watchdog is stopped by the platform firmware. | |
558 | */ | |
559 | ||
560 | #ifdef CONFIG_ACPI | |
561 | static inline bool need_suspend(void) | |
562 | { | |
563 | return acpi_target_system_state() == ACPI_STATE_S0; | |
564 | } | |
565 | #else | |
566 | static inline bool need_suspend(void) { return true; } | |
567 | #endif | |
568 | ||
569 | static int iTCO_wdt_suspend_noirq(struct device *dev) | |
570 | { | |
ce1b95ca | 571 | struct iTCO_wdt_private *p = dev_get_drvdata(dev); |
f321c9cb RW |
572 | int ret = 0; |
573 | ||
ce1b95ca GR |
574 | p->suspended = false; |
575 | if (watchdog_active(&p->wddev) && need_suspend()) { | |
576 | ret = iTCO_wdt_stop(&p->wddev); | |
f321c9cb | 577 | if (!ret) |
ce1b95ca | 578 | p->suspended = true; |
f321c9cb RW |
579 | } |
580 | return ret; | |
581 | } | |
582 | ||
583 | static int iTCO_wdt_resume_noirq(struct device *dev) | |
584 | { | |
ce1b95ca GR |
585 | struct iTCO_wdt_private *p = dev_get_drvdata(dev); |
586 | ||
587 | if (p->suspended) | |
588 | iTCO_wdt_start(&p->wddev); | |
f321c9cb RW |
589 | |
590 | return 0; | |
591 | } | |
592 | ||
6e938f6e | 593 | static const struct dev_pm_ops iTCO_wdt_pm = { |
f321c9cb RW |
594 | .suspend_noirq = iTCO_wdt_suspend_noirq, |
595 | .resume_noirq = iTCO_wdt_resume_noirq, | |
596 | }; | |
597 | ||
598 | #define ITCO_WDT_PM_OPS (&iTCO_wdt_pm) | |
599 | #else | |
600 | #define ITCO_WDT_PM_OPS NULL | |
601 | #endif /* CONFIG_PM_SLEEP */ | |
602 | ||
3836cc0f WVS |
603 | static struct platform_driver iTCO_wdt_driver = { |
604 | .probe = iTCO_wdt_probe, | |
82268714 | 605 | .remove = iTCO_wdt_remove, |
3836cc0f | 606 | .shutdown = iTCO_wdt_shutdown, |
3836cc0f | 607 | .driver = { |
3836cc0f | 608 | .name = DRV_NAME, |
f321c9cb | 609 | .pm = ITCO_WDT_PM_OPS, |
3836cc0f WVS |
610 | }, |
611 | }; | |
612 | ||
613 | static int __init iTCO_wdt_init_module(void) | |
614 | { | |
615 | int err; | |
616 | ||
27c766aa | 617 | pr_info("Intel TCO WatchDog Timer Driver v%s\n", DRV_VERSION); |
3836cc0f WVS |
618 | |
619 | err = platform_driver_register(&iTCO_wdt_driver); | |
620 | if (err) | |
621 | return err; | |
622 | ||
3836cc0f | 623 | return 0; |
3836cc0f WVS |
624 | } |
625 | ||
626 | static void __exit iTCO_wdt_cleanup_module(void) | |
627 | { | |
3836cc0f | 628 | platform_driver_unregister(&iTCO_wdt_driver); |
27c766aa | 629 | pr_info("Watchdog Module Unloaded\n"); |
9e0ea345 WVS |
630 | } |
631 | ||
632 | module_init(iTCO_wdt_init_module); | |
633 | module_exit(iTCO_wdt_cleanup_module); | |
634 | ||
635 | MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>"); | |
636 | MODULE_DESCRIPTION("Intel TCO WatchDog Timer Driver"); | |
3836cc0f | 637 | MODULE_VERSION(DRV_VERSION); |
9e0ea345 | 638 | MODULE_LICENSE("GPL"); |
e5de32e3 | 639 | MODULE_ALIAS("platform:" DRV_NAME); |