Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Vlad Drukker | 0e94f2e | 2007-03-25 17:34:39 +0200 | [diff] [blame] | 2 | * w83627hf/thf WDT driver |
| 3 | * |
Guenter Roeck | 30a83695 | 2013-10-28 19:43:57 -0700 | [diff] [blame] | 4 | * (c) Copyright 2013 Guenter Roeck |
| 5 | * converted to watchdog infrastructure |
| 6 | * |
Vlad Drukker | 0e94f2e | 2007-03-25 17:34:39 +0200 | [diff] [blame] | 7 | * (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com> |
| 8 | * added support for W83627THF. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * |
Al Viro | d36b691 | 2011-12-29 17:09:01 -0500 | [diff] [blame] | 10 | * (c) Copyright 2003,2007 Pádraig Brady <P@draigBrady.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * |
| 12 | * Based on advantechwdt.c which is based on wdt.c. |
| 13 | * Original copyright messages: |
| 14 | * |
| 15 | * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl> |
| 16 | * |
Alan Cox | 29fa058 | 2008-10-27 15:17:56 +0000 | [diff] [blame] | 17 | * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>, |
| 18 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | * |
| 20 | * This program is free software; you can redistribute it and/or |
| 21 | * modify it under the terms of the GNU General Public License |
| 22 | * as published by the Free Software Foundation; either version |
| 23 | * 2 of the License, or (at your option) any later version. |
| 24 | * |
| 25 | * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide |
| 26 | * warranty for any of this software. This material is provided |
| 27 | * "AS-IS" and at no charge. |
| 28 | * |
Alan Cox | 29fa058 | 2008-10-27 15:17:56 +0000 | [diff] [blame] | 29 | * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | */ |
| 31 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 32 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/module.h> |
| 35 | #include <linux/moduleparam.h> |
| 36 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <linux/watchdog.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <linux/ioport.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <linux/init.h> |
Alan Cox | 46a3949 | 2008-05-19 14:09:18 +0100 | [diff] [blame] | 40 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Benny Loenstrup Ammitzboell | 9c67bea | 2010-11-11 16:08:41 +0100 | [diff] [blame] | 42 | #define WATCHDOG_NAME "w83627hf/thf/hg/dhg WDT" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */ |
| 44 | |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 45 | static int wdt_io; |
Guenter Roeck | 7b6d0b6 | 2013-08-17 13:58:44 -0700 | [diff] [blame] | 46 | static int cr_wdt_timeout; /* WDT timeout register */ |
| 47 | static int cr_wdt_control; /* WDT control register */ |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 48 | |
Guenter Roeck | 7b6d0b6 | 2013-08-17 13:58:44 -0700 | [diff] [blame] | 49 | enum chips { w83627hf, w83627s, w83697hf, w83697ug, w83637hf, w83627thf, |
| 50 | w83687thf, w83627ehf, w83627dhg, w83627uhg, w83667hg, w83627dhg_p, |
Guenter Roeck | a77841d | 2015-01-26 08:53:56 -0800 | [diff] [blame] | 51 | w83667hg_b, nct6775, nct6776, nct6779, nct6791, nct6792 }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Guenter Roeck | 30a83695 | 2013-10-28 19:43:57 -0700 | [diff] [blame] | 53 | static int timeout; /* in seconds */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | module_param(timeout, int, 0); |
Alan Cox | 46a3949 | 2008-05-19 14:09:18 +0100 | [diff] [blame] | 55 | MODULE_PARM_DESC(timeout, |
| 56 | "Watchdog timeout in seconds. 1 <= timeout <= 255, default=" |
| 57 | __MODULE_STRING(WATCHDOG_TIMEOUT) "."); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Wim Van Sebroeck | 86a1e18 | 2012-03-05 16:51:11 +0100 | [diff] [blame] | 59 | static bool nowayout = WATCHDOG_NOWAYOUT; |
| 60 | module_param(nowayout, bool, 0); |
Alan Cox | 46a3949 | 2008-05-19 14:09:18 +0100 | [diff] [blame] | 61 | MODULE_PARM_DESC(nowayout, |
| 62 | "Watchdog cannot be stopped once started (default=" |
| 63 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Guenter Roeck | be28158 | 2014-04-05 11:27:36 -0700 | [diff] [blame] | 65 | static int early_disable; |
| 66 | module_param(early_disable, int, 0); |
| 67 | MODULE_PARM_DESC(early_disable, "Disable watchdog at boot time (default=0)"); |
| 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | /* |
| 70 | * Kernel methods. |
| 71 | */ |
| 72 | |
| 73 | #define WDT_EFER (wdt_io+0) /* Extended Function Enable Registers */ |
Alan Cox | 46a3949 | 2008-05-19 14:09:18 +0100 | [diff] [blame] | 74 | #define WDT_EFIR (wdt_io+0) /* Extended Function Index Register |
| 75 | (same as EFER) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | #define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */ |
| 77 | |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 78 | #define W83627HF_LD_WDT 0x08 |
| 79 | |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 80 | #define W83627HF_ID 0x52 |
| 81 | #define W83627S_ID 0x59 |
Guenter Roeck | 7b6d0b6 | 2013-08-17 13:58:44 -0700 | [diff] [blame] | 82 | #define W83697HF_ID 0x60 |
| 83 | #define W83697UG_ID 0x68 |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 84 | #define W83637HF_ID 0x70 |
| 85 | #define W83627THF_ID 0x82 |
| 86 | #define W83687THF_ID 0x85 |
| 87 | #define W83627EHF_ID 0x88 |
| 88 | #define W83627DHG_ID 0xa0 |
| 89 | #define W83627UHG_ID 0xa2 |
| 90 | #define W83667HG_ID 0xa5 |
| 91 | #define W83627DHG_P_ID 0xb0 |
| 92 | #define W83667HG_B_ID 0xb3 |
| 93 | #define NCT6775_ID 0xb4 |
| 94 | #define NCT6776_ID 0xc3 |
| 95 | #define NCT6779_ID 0xc5 |
Guenter Roeck | a77841d | 2015-01-26 08:53:56 -0800 | [diff] [blame] | 96 | #define NCT6791_ID 0xc8 |
| 97 | #define NCT6792_ID 0xc9 |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 98 | |
Guenter Roeck | 7b6d0b6 | 2013-08-17 13:58:44 -0700 | [diff] [blame] | 99 | #define W83627HF_WDT_TIMEOUT 0xf6 |
| 100 | #define W83697HF_WDT_TIMEOUT 0xf4 |
| 101 | |
| 102 | #define W83627HF_WDT_CONTROL 0xf5 |
| 103 | #define W83697HF_WDT_CONTROL 0xf3 |
| 104 | |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 105 | static void superio_outb(int reg, int val) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | { |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 107 | outb(reg, WDT_EFER); |
| 108 | outb(val, WDT_EFDR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | } |
| 110 | |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 111 | static inline int superio_inb(int reg) |
| 112 | { |
| 113 | outb(reg, WDT_EFER); |
| 114 | return inb(WDT_EFDR); |
| 115 | } |
| 116 | |
| 117 | static int superio_enter(void) |
| 118 | { |
| 119 | if (!request_muxed_region(wdt_io, 2, WATCHDOG_NAME)) |
| 120 | return -EBUSY; |
| 121 | |
| 122 | outb_p(0x87, WDT_EFER); /* Enter extended function mode */ |
| 123 | outb_p(0x87, WDT_EFER); /* Again according to manual */ |
| 124 | |
| 125 | return 0; |
| 126 | } |
| 127 | |
| 128 | static void superio_select(int ld) |
| 129 | { |
| 130 | superio_outb(0x07, ld); |
| 131 | } |
| 132 | |
| 133 | static void superio_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | { |
| 135 | outb_p(0xAA, WDT_EFER); /* Leave extended function mode */ |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 136 | release_region(wdt_io, 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | } |
| 138 | |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 139 | static int w83627hf_init(struct watchdog_device *wdog, enum chips chip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | { |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 141 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | unsigned char t; |
| 143 | |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 144 | ret = superio_enter(); |
| 145 | if (ret) |
| 146 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 148 | superio_select(W83627HF_LD_WDT); |
Guenter Roeck | 8f52638 | 2013-08-17 13:58:40 -0700 | [diff] [blame] | 149 | |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 150 | /* set CR30 bit 0 to activate GPIO2 */ |
| 151 | t = superio_inb(0x30); |
Guenter Roeck | ac46110 | 2013-08-17 13:58:41 -0700 | [diff] [blame] | 152 | if (!(t & 0x01)) |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 153 | superio_outb(0x30, t | 0x01); |
Guenter Roeck | 8f52638 | 2013-08-17 13:58:40 -0700 | [diff] [blame] | 154 | |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 155 | switch (chip) { |
| 156 | case w83627hf: |
| 157 | case w83627s: |
| 158 | t = superio_inb(0x2B) & ~0x10; |
| 159 | superio_outb(0x2B, t); /* set GPIO24 to WDT0 */ |
| 160 | break; |
Guenter Roeck | 7b6d0b6 | 2013-08-17 13:58:44 -0700 | [diff] [blame] | 161 | case w83697hf: |
| 162 | /* Set pin 119 to WDTO# mode (= CR29, WDT0) */ |
| 163 | t = superio_inb(0x29) & ~0x60; |
| 164 | t |= 0x20; |
| 165 | superio_outb(0x29, t); |
| 166 | break; |
| 167 | case w83697ug: |
| 168 | /* Set pin 118 to WDTO# mode */ |
| 169 | t = superio_inb(0x2b) & ~0x04; |
| 170 | superio_outb(0x2b, t); |
| 171 | break; |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 172 | case w83627thf: |
| 173 | t = (superio_inb(0x2B) & ~0x08) | 0x04; |
| 174 | superio_outb(0x2B, t); /* set GPIO3 to WDT0 */ |
| 175 | break; |
| 176 | case w83627dhg: |
| 177 | case w83627dhg_p: |
| 178 | t = superio_inb(0x2D) & ~0x01; /* PIN77 -> WDT0# */ |
| 179 | superio_outb(0x2D, t); /* set GPIO5 to WDT0 */ |
Guenter Roeck | 7b6d0b6 | 2013-08-17 13:58:44 -0700 | [diff] [blame] | 180 | t = superio_inb(cr_wdt_control); |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 181 | t |= 0x02; /* enable the WDTO# output low pulse |
| 182 | * to the KBRST# pin */ |
Guenter Roeck | 7b6d0b6 | 2013-08-17 13:58:44 -0700 | [diff] [blame] | 183 | superio_outb(cr_wdt_control, t); |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 184 | break; |
| 185 | case w83637hf: |
| 186 | break; |
| 187 | case w83687thf: |
| 188 | t = superio_inb(0x2C) & ~0x80; /* PIN47 -> WDT0# */ |
| 189 | superio_outb(0x2C, t); |
| 190 | break; |
| 191 | case w83627ehf: |
| 192 | case w83627uhg: |
| 193 | case w83667hg: |
| 194 | case w83667hg_b: |
| 195 | case nct6775: |
| 196 | case nct6776: |
| 197 | case nct6779: |
Guenter Roeck | a77841d | 2015-01-26 08:53:56 -0800 | [diff] [blame] | 198 | case nct6791: |
| 199 | case nct6792: |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 200 | /* |
| 201 | * These chips have a fixed WDTO# output pin (W83627UHG), |
| 202 | * or support more than one WDTO# output pin. |
| 203 | * Don't touch its configuration, and hope the BIOS |
| 204 | * does the right thing. |
| 205 | */ |
Guenter Roeck | 7b6d0b6 | 2013-08-17 13:58:44 -0700 | [diff] [blame] | 206 | t = superio_inb(cr_wdt_control); |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 207 | t |= 0x02; /* enable the WDTO# output low pulse |
| 208 | * to the KBRST# pin */ |
Guenter Roeck | 7b6d0b6 | 2013-08-17 13:58:44 -0700 | [diff] [blame] | 209 | superio_outb(cr_wdt_control, t); |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 210 | break; |
| 211 | default: |
| 212 | break; |
| 213 | } |
| 214 | |
Guenter Roeck | 7b6d0b6 | 2013-08-17 13:58:44 -0700 | [diff] [blame] | 215 | t = superio_inb(cr_wdt_timeout); |
P@Draig Brady | 93642ec | 2005-08-17 09:06:07 +0200 | [diff] [blame] | 216 | if (t != 0) { |
Guenter Roeck | be28158 | 2014-04-05 11:27:36 -0700 | [diff] [blame] | 217 | if (early_disable) { |
| 218 | pr_warn("Stopping previously enabled watchdog until userland kicks in\n"); |
| 219 | superio_outb(cr_wdt_timeout, 0); |
| 220 | } else { |
| 221 | pr_info("Watchdog already running. Resetting timeout to %d sec\n", |
| 222 | wdog->timeout); |
| 223 | superio_outb(cr_wdt_timeout, wdog->timeout); |
| 224 | } |
P@Draig Brady | 93642ec | 2005-08-17 09:06:07 +0200 | [diff] [blame] | 225 | } |
Pádraig Brady | 28dd1b0 | 2007-07-24 11:49:27 +0100 | [diff] [blame] | 226 | |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 227 | /* set second mode & disable keyboard turning off watchdog */ |
Guenter Roeck | 7b6d0b6 | 2013-08-17 13:58:44 -0700 | [diff] [blame] | 228 | t = superio_inb(cr_wdt_control) & ~0x0C; |
| 229 | superio_outb(cr_wdt_control, t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
Guenter Roeck | ea3d401 | 2013-08-17 13:58:46 -0700 | [diff] [blame] | 231 | /* reset trigger, disable keyboard & mouse turning off watchdog */ |
| 232 | t = superio_inb(0xF7) & ~0xD0; |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 233 | superio_outb(0xF7, t); |
Pádraig Brady | 28dd1b0 | 2007-07-24 11:49:27 +0100 | [diff] [blame] | 234 | |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 235 | superio_exit(); |
| 236 | |
| 237 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | } |
| 239 | |
Guenter Roeck | 30a83695 | 2013-10-28 19:43:57 -0700 | [diff] [blame] | 240 | static int wdt_set_time(unsigned int timeout) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | { |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 242 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 244 | ret = superio_enter(); |
| 245 | if (ret) |
| 246 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 248 | superio_select(W83627HF_LD_WDT); |
Guenter Roeck | 7b6d0b6 | 2013-08-17 13:58:44 -0700 | [diff] [blame] | 249 | superio_outb(cr_wdt_timeout, timeout); |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 250 | superio_exit(); |
Wim Van Sebroeck | ab9d441 | 2006-09-02 18:50:20 +0200 | [diff] [blame] | 251 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | return 0; |
| 253 | } |
| 254 | |
Guenter Roeck | 30a83695 | 2013-10-28 19:43:57 -0700 | [diff] [blame] | 255 | static int wdt_start(struct watchdog_device *wdog) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | { |
Guenter Roeck | 30a83695 | 2013-10-28 19:43:57 -0700 | [diff] [blame] | 257 | return wdt_set_time(wdog->timeout); |
| 258 | } |
| 259 | |
| 260 | static int wdt_stop(struct watchdog_device *wdog) |
| 261 | { |
| 262 | return wdt_set_time(0); |
| 263 | } |
| 264 | |
| 265 | static int wdt_set_timeout(struct watchdog_device *wdog, unsigned int timeout) |
| 266 | { |
| 267 | wdog->timeout = timeout; |
| 268 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | return 0; |
| 270 | } |
| 271 | |
Guenter Roeck | 30a83695 | 2013-10-28 19:43:57 -0700 | [diff] [blame] | 272 | static unsigned int wdt_get_time(struct watchdog_device *wdog) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | { |
Guenter Roeck | 30a83695 | 2013-10-28 19:43:57 -0700 | [diff] [blame] | 274 | unsigned int timeleft; |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 275 | int ret; |
Greg Lee | c63b6d0 | 2011-09-12 20:28:46 -0400 | [diff] [blame] | 276 | |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 277 | ret = superio_enter(); |
| 278 | if (ret) |
| 279 | return 0; |
Greg Lee | c63b6d0 | 2011-09-12 20:28:46 -0400 | [diff] [blame] | 280 | |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 281 | superio_select(W83627HF_LD_WDT); |
Guenter Roeck | 7b6d0b6 | 2013-08-17 13:58:44 -0700 | [diff] [blame] | 282 | timeleft = superio_inb(cr_wdt_timeout); |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 283 | superio_exit(); |
Greg Lee | c63b6d0 | 2011-09-12 20:28:46 -0400 | [diff] [blame] | 284 | |
Greg Lee | c63b6d0 | 2011-09-12 20:28:46 -0400 | [diff] [blame] | 285 | return timeleft; |
| 286 | } |
| 287 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | * Kernel Interfaces |
| 290 | */ |
| 291 | |
Guenter Roeck | 30a83695 | 2013-10-28 19:43:57 -0700 | [diff] [blame] | 292 | static struct watchdog_info wdt_info = { |
| 293 | .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, |
| 294 | .identity = "W83627HF Watchdog", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | }; |
| 296 | |
Guenter Roeck | 30a83695 | 2013-10-28 19:43:57 -0700 | [diff] [blame] | 297 | static struct watchdog_ops wdt_ops = { |
| 298 | .owner = THIS_MODULE, |
| 299 | .start = wdt_start, |
| 300 | .stop = wdt_stop, |
| 301 | .set_timeout = wdt_set_timeout, |
| 302 | .get_timeleft = wdt_get_time, |
| 303 | }; |
| 304 | |
| 305 | static struct watchdog_device wdt_dev = { |
| 306 | .info = &wdt_info, |
| 307 | .ops = &wdt_ops, |
| 308 | .timeout = WATCHDOG_TIMEOUT, |
| 309 | .min_timeout = 1, |
| 310 | .max_timeout = 255, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | }; |
| 312 | |
| 313 | /* |
| 314 | * The WDT needs to learn about soft shutdowns in order to |
| 315 | * turn the timebomb registers off. |
| 316 | */ |
| 317 | |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 318 | static int wdt_find(int addr) |
| 319 | { |
| 320 | u8 val; |
| 321 | int ret; |
| 322 | |
Guenter Roeck | 7b6d0b6 | 2013-08-17 13:58:44 -0700 | [diff] [blame] | 323 | cr_wdt_timeout = W83627HF_WDT_TIMEOUT; |
| 324 | cr_wdt_control = W83627HF_WDT_CONTROL; |
| 325 | |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 326 | ret = superio_enter(); |
| 327 | if (ret) |
| 328 | return ret; |
| 329 | superio_select(W83627HF_LD_WDT); |
| 330 | val = superio_inb(0x20); |
| 331 | switch (val) { |
| 332 | case W83627HF_ID: |
| 333 | ret = w83627hf; |
| 334 | break; |
| 335 | case W83627S_ID: |
| 336 | ret = w83627s; |
| 337 | break; |
Guenter Roeck | 7b6d0b6 | 2013-08-17 13:58:44 -0700 | [diff] [blame] | 338 | case W83697HF_ID: |
| 339 | ret = w83697hf; |
| 340 | cr_wdt_timeout = W83697HF_WDT_TIMEOUT; |
| 341 | cr_wdt_control = W83697HF_WDT_CONTROL; |
| 342 | break; |
| 343 | case W83697UG_ID: |
| 344 | ret = w83697ug; |
| 345 | cr_wdt_timeout = W83697HF_WDT_TIMEOUT; |
| 346 | cr_wdt_control = W83697HF_WDT_CONTROL; |
| 347 | break; |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 348 | case W83637HF_ID: |
| 349 | ret = w83637hf; |
| 350 | break; |
| 351 | case W83627THF_ID: |
| 352 | ret = w83627thf; |
| 353 | break; |
| 354 | case W83687THF_ID: |
| 355 | ret = w83687thf; |
| 356 | break; |
| 357 | case W83627EHF_ID: |
| 358 | ret = w83627ehf; |
| 359 | break; |
| 360 | case W83627DHG_ID: |
| 361 | ret = w83627dhg; |
| 362 | break; |
| 363 | case W83627DHG_P_ID: |
| 364 | ret = w83627dhg_p; |
| 365 | break; |
| 366 | case W83627UHG_ID: |
| 367 | ret = w83627uhg; |
| 368 | break; |
| 369 | case W83667HG_ID: |
| 370 | ret = w83667hg; |
| 371 | break; |
| 372 | case W83667HG_B_ID: |
| 373 | ret = w83667hg_b; |
| 374 | break; |
| 375 | case NCT6775_ID: |
| 376 | ret = nct6775; |
| 377 | break; |
| 378 | case NCT6776_ID: |
| 379 | ret = nct6776; |
| 380 | break; |
| 381 | case NCT6779_ID: |
| 382 | ret = nct6779; |
| 383 | break; |
Guenter Roeck | a77841d | 2015-01-26 08:53:56 -0800 | [diff] [blame] | 384 | case NCT6791_ID: |
| 385 | ret = nct6791; |
| 386 | break; |
| 387 | case NCT6792_ID: |
| 388 | ret = nct6792; |
| 389 | break; |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 390 | case 0xff: |
| 391 | ret = -ENODEV; |
| 392 | break; |
| 393 | default: |
| 394 | ret = -ENODEV; |
| 395 | pr_err("Unsupported chip ID: 0x%02x\n", val); |
| 396 | break; |
| 397 | } |
| 398 | superio_exit(); |
| 399 | return ret; |
| 400 | } |
| 401 | |
Alan Cox | 46a3949 | 2008-05-19 14:09:18 +0100 | [diff] [blame] | 402 | static int __init wdt_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | { |
| 404 | int ret; |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 405 | int chip; |
| 406 | const char * const chip_name[] = { |
| 407 | "W83627HF", |
| 408 | "W83627S", |
Guenter Roeck | 7b6d0b6 | 2013-08-17 13:58:44 -0700 | [diff] [blame] | 409 | "W83697HF", |
| 410 | "W83697UG", |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 411 | "W83637HF", |
| 412 | "W83627THF", |
| 413 | "W83687THF", |
| 414 | "W83627EHF", |
| 415 | "W83627DHG", |
| 416 | "W83627UHG", |
| 417 | "W83667HG", |
| 418 | "W83667DHG-P", |
| 419 | "W83667HG-B", |
| 420 | "NCT6775", |
| 421 | "NCT6776", |
| 422 | "NCT6779", |
Guenter Roeck | a77841d | 2015-01-26 08:53:56 -0800 | [diff] [blame] | 423 | "NCT6791", |
| 424 | "NCT6792", |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 425 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 427 | wdt_io = 0x2e; |
| 428 | chip = wdt_find(0x2e); |
| 429 | if (chip < 0) { |
| 430 | wdt_io = 0x4e; |
| 431 | chip = wdt_find(0x4e); |
| 432 | if (chip < 0) |
| 433 | return chip; |
| 434 | } |
| 435 | |
| 436 | pr_info("WDT driver for %s Super I/O chip initialising\n", |
| 437 | chip_name[chip]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
Guenter Roeck | 30a83695 | 2013-10-28 19:43:57 -0700 | [diff] [blame] | 439 | watchdog_init_timeout(&wdt_dev, timeout, NULL); |
| 440 | watchdog_set_nowayout(&wdt_dev, nowayout); |
Damien Riegel | d68106b | 2015-11-20 16:54:56 -0500 | [diff] [blame] | 441 | watchdog_stop_on_reboot(&wdt_dev); |
Guenter Roeck | 30a83695 | 2013-10-28 19:43:57 -0700 | [diff] [blame] | 442 | |
Guenter Roeck | 962c04f | 2013-08-17 13:58:43 -0700 | [diff] [blame] | 443 | ret = w83627hf_init(&wdt_dev, chip); |
Guenter Roeck | ef0c1a6 | 2013-08-17 13:58:42 -0700 | [diff] [blame] | 444 | if (ret) { |
| 445 | pr_err("failed to initialize watchdog (err=%d)\n", ret); |
| 446 | return ret; |
| 447 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | |
Guenter Roeck | 30a83695 | 2013-10-28 19:43:57 -0700 | [diff] [blame] | 449 | ret = watchdog_register_device(&wdt_dev); |
| 450 | if (ret) |
Damien Riegel | d68106b | 2015-11-20 16:54:56 -0500 | [diff] [blame] | 451 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 453 | pr_info("initialized. timeout=%d sec (nowayout=%d)\n", |
Guenter Roeck | 30a83695 | 2013-10-28 19:43:57 -0700 | [diff] [blame] | 454 | wdt_dev.timeout, nowayout); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | } |
| 458 | |
Alan Cox | 46a3949 | 2008-05-19 14:09:18 +0100 | [diff] [blame] | 459 | static void __exit wdt_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | { |
Guenter Roeck | 30a83695 | 2013-10-28 19:43:57 -0700 | [diff] [blame] | 461 | watchdog_unregister_device(&wdt_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | } |
| 463 | |
| 464 | module_init(wdt_init); |
| 465 | module_exit(wdt_exit); |
| 466 | |
| 467 | MODULE_LICENSE("GPL"); |
Al Viro | d36b691 | 2011-12-29 17:09:01 -0500 | [diff] [blame] | 468 | MODULE_AUTHOR("Pádraig Brady <P@draigBrady.com>"); |
Vlad Drukker | 0e94f2e | 2007-03-25 17:34:39 +0200 | [diff] [blame] | 469 | MODULE_DESCRIPTION("w83627hf/thf WDT driver"); |