Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * PC Watchdog Driver |
| 3 | * by Ken Hollis (khollis@bitgate.com) |
| 4 | * |
Wim Van Sebroeck | f9146f2 | 2007-01-09 22:38:54 +0100 | [diff] [blame^] | 5 | * Permission granted from Simon Machell (smachell@berkprod.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * Written for the Linux Kernel, and GPLed by Ken Hollis |
| 7 | * |
| 8 | * 960107 Added request_region routines, modulized the whole thing. |
| 9 | * 960108 Fixed end-of-file pointer (Thanks to Dan Hollis), added |
| 10 | * WD_TIMEOUT define. |
| 11 | * 960216 Added eof marker on the file, and changed verbose messages. |
| 12 | * 960716 Made functional and cosmetic changes to the source for |
| 13 | * inclusion in Linux 2.0.x kernels, thanks to Alan Cox. |
| 14 | * 960717 Removed read/seek routines, replaced with ioctl. Also, added |
| 15 | * check_region command due to Alan's suggestion. |
| 16 | * 960821 Made changes to compile in newer 2.0.x kernels. Added |
| 17 | * "cold reboot sense" entry. |
| 18 | * 960825 Made a few changes to code, deleted some defines and made |
| 19 | * typedefs to replace them. Made heartbeat reset only available |
| 20 | * via ioctl, and removed the write routine. |
| 21 | * 960828 Added new items for PC Watchdog Rev.C card. |
| 22 | * 960829 Changed around all of the IOCTLs, added new features, |
| 23 | * added watchdog disable/re-enable routines. Added firmware |
| 24 | * version reporting. Added read routine for temperature. |
| 25 | * Removed some extra defines, added an autodetect Revision |
| 26 | * routine. |
| 27 | * 961006 Revised some documentation, fixed some cosmetic bugs. Made |
| 28 | * drivers to panic the system if it's overheating at bootup. |
| 29 | * 961118 Changed some verbiage on some of the output, tidied up |
| 30 | * code bits, and added compatibility to 2.1.x. |
| 31 | * 970912 Enabled board on open and disable on close. |
| 32 | * 971107 Took account of recent VFS changes (broke read). |
| 33 | * 971210 Disable board on initialisation in case board already ticking. |
| 34 | * 971222 Changed open/close for temperature handling |
| 35 | * Michael Meskes <meskes@debian.org>. |
| 36 | * 980112 Used minor numbers from include/linux/miscdevice.h |
| 37 | * 990403 Clear reset status after reading control status register in |
| 38 | * pcwd_showprevstate(). [Marc Boucher <marc@mbsi.ca>] |
| 39 | * 990605 Made changes to code to support Firmware 1.22a, added |
| 40 | * fairly useless proc entry. |
| 41 | * 990610 removed said useless proc code for the merge <alan> |
| 42 | * 000403 Removed last traces of proc code. <davej> |
| 43 | * 011214 Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com> |
| 44 | * Added timeout module option to override default |
| 45 | */ |
| 46 | |
| 47 | /* |
| 48 | * A bells and whistles driver is available from http://www.pcwd.de/ |
| 49 | * More info available at http://www.berkprod.com/ or http://www.pcwatchdog.com/ |
| 50 | */ |
| 51 | |
Wim Van Sebroeck | fd41fa6 | 2005-12-10 14:22:37 +0100 | [diff] [blame] | 52 | #include <linux/module.h> /* For module specific items */ |
| 53 | #include <linux/moduleparam.h> /* For new moduleparam's */ |
| 54 | #include <linux/types.h> /* For standard types (like size_t) */ |
| 55 | #include <linux/errno.h> /* For the -ENODEV/... values */ |
| 56 | #include <linux/kernel.h> /* For printk/panic/... */ |
| 57 | #include <linux/delay.h> /* For mdelay function */ |
| 58 | #include <linux/timer.h> /* For timer related operations */ |
| 59 | #include <linux/jiffies.h> /* For jiffies stuff */ |
| 60 | #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */ |
| 61 | #include <linux/watchdog.h> /* For the watchdog specific items */ |
| 62 | #include <linux/notifier.h> /* For notifier support */ |
| 63 | #include <linux/reboot.h> /* For reboot_notifier stuff */ |
| 64 | #include <linux/init.h> /* For __init/__exit/... */ |
| 65 | #include <linux/fs.h> /* For file operations */ |
| 66 | #include <linux/ioport.h> /* For io-port access */ |
| 67 | #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Wim Van Sebroeck | fd41fa6 | 2005-12-10 14:22:37 +0100 | [diff] [blame] | 69 | #include <asm/uaccess.h> /* For copy_to_user/put_user/... */ |
| 70 | #include <asm/io.h> /* For inb/outb/... */ |
| 71 | |
| 72 | /* Module and version information */ |
Wim Van Sebroeck | 4206f0c | 2006-02-12 16:37:36 +0100 | [diff] [blame] | 73 | #define WATCHDOG_VERSION "1.17" |
| 74 | #define WATCHDOG_DATE "12 Feb 2006" |
Wim Van Sebroeck | a7122f9 | 2006-01-09 22:07:22 +0100 | [diff] [blame] | 75 | #define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog" |
| 76 | #define WATCHDOG_NAME "pcwd" |
| 77 | #define PFX WATCHDOG_NAME ": " |
| 78 | #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n" |
| 79 | #define WD_VER WATCHDOG_VERSION " (" WATCHDOG_DATE ")" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
| 81 | /* |
| 82 | * It should be noted that PCWD_REVISION_B was removed because A and B |
| 83 | * are essentially the same types of card, with the exception that B |
| 84 | * has temperature reporting. Since I didn't receive a Rev.B card, |
| 85 | * the Rev.B card is not supported. (It's a good thing too, as they |
| 86 | * are no longer in production.) |
| 87 | */ |
| 88 | #define PCWD_REVISION_A 1 |
| 89 | #define PCWD_REVISION_C 2 |
| 90 | |
| 91 | /* |
Wim Van Sebroeck | 8f0235d | 2006-01-09 21:56:09 +0100 | [diff] [blame] | 92 | * These are the defines that describe the control status bits for the |
| 93 | * PCI-PC Watchdog card. |
| 94 | */ |
| 95 | /* Port 1 : Control Status #1 for the PC Watchdog card, revision A. */ |
Wim Van Sebroeck | 4206f0c | 2006-02-12 16:37:36 +0100 | [diff] [blame] | 96 | #define WD_WDRST 0x01 /* Previously reset state */ |
| 97 | #define WD_T110 0x02 /* Temperature overheat sense */ |
| 98 | #define WD_HRTBT 0x04 /* Heartbeat sense */ |
| 99 | #define WD_RLY2 0x08 /* External relay triggered */ |
| 100 | #define WD_SRLY2 0x80 /* Software external relay triggered */ |
Wim Van Sebroeck | 8f0235d | 2006-01-09 21:56:09 +0100 | [diff] [blame] | 101 | /* Port 1 : Control Status #1 for the PC Watchdog card, revision C. */ |
Wim Van Sebroeck | 4206f0c | 2006-02-12 16:37:36 +0100 | [diff] [blame] | 102 | #define WD_REVC_WTRP 0x01 /* Watchdog Trip status */ |
| 103 | #define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */ |
| 104 | #define WD_REVC_TTRP 0x04 /* Temperature Trip status */ |
| 105 | #define WD_REVC_RL2A 0x08 /* Relay 2 activated by on-board processor */ |
| 106 | #define WD_REVC_RL1A 0x10 /* Relay 1 active */ |
| 107 | #define WD_REVC_R2DS 0x40 /* Relay 2 disable */ |
| 108 | #define WD_REVC_RLY2 0x80 /* Relay 2 activated? */ |
Wim Van Sebroeck | 8f0235d | 2006-01-09 21:56:09 +0100 | [diff] [blame] | 109 | /* Port 2 : Control Status #2 */ |
| 110 | #define WD_WDIS 0x10 /* Watchdog Disabled */ |
| 111 | #define WD_ENTP 0x20 /* Watchdog Enable Temperature Trip */ |
| 112 | #define WD_SSEL 0x40 /* Watchdog Switch Select (1:SW1 <-> 0:SW2) */ |
| 113 | #define WD_WCMD 0x80 /* Watchdog Command Mode */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
| 115 | /* max. time we give an ISA watchdog card to process a command */ |
| 116 | /* 500ms for each 4 bit response (according to spec.) */ |
| 117 | #define ISA_COMMAND_TIMEOUT 1000 |
| 118 | |
| 119 | /* Watchdog's internal commands */ |
Wim Van Sebroeck | fd41fa6 | 2005-12-10 14:22:37 +0100 | [diff] [blame] | 120 | #define CMD_ISA_IDLE 0x00 |
| 121 | #define CMD_ISA_VERSION_INTEGER 0x01 |
| 122 | #define CMD_ISA_VERSION_TENTH 0x02 |
| 123 | #define CMD_ISA_VERSION_HUNDRETH 0x03 |
| 124 | #define CMD_ISA_VERSION_MINOR 0x04 |
| 125 | #define CMD_ISA_SWITCH_SETTINGS 0x05 |
Wim Van Sebroeck | 369fa25 | 2006-02-12 17:44:57 +0100 | [diff] [blame] | 126 | #define CMD_ISA_RESET_PC 0x06 |
| 127 | #define CMD_ISA_ARM_0 0x07 |
| 128 | #define CMD_ISA_ARM_30 0x08 |
| 129 | #define CMD_ISA_ARM_60 0x09 |
Wim Van Sebroeck | fd41fa6 | 2005-12-10 14:22:37 +0100 | [diff] [blame] | 130 | #define CMD_ISA_DELAY_TIME_2SECS 0x0A |
| 131 | #define CMD_ISA_DELAY_TIME_4SECS 0x0B |
| 132 | #define CMD_ISA_DELAY_TIME_8SECS 0x0C |
Wim Van Sebroeck | 369fa25 | 2006-02-12 17:44:57 +0100 | [diff] [blame] | 133 | #define CMD_ISA_RESET_RELAYS 0x0D |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
| 135 | /* |
| 136 | * We are using an kernel timer to do the pinging of the watchdog |
| 137 | * every ~500ms. We try to set the internal heartbeat of the |
| 138 | * watchdog to 2 ms. |
| 139 | */ |
| 140 | |
| 141 | #define WDT_INTERVAL (HZ/2+1) |
| 142 | |
| 143 | /* We can only use 1 card due to the /dev/watchdog restriction */ |
| 144 | static int cards_found; |
| 145 | |
| 146 | /* internal variables */ |
| 147 | static atomic_t open_allowed = ATOMIC_INIT(1); |
| 148 | static char expect_close; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | static int temp_panic; |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 150 | static struct { /* this is private data for each ISA-PC watchdog card */ |
Wim Van Sebroeck | 2891b6a | 2006-02-12 16:47:34 +0100 | [diff] [blame] | 151 | char fw_ver_str[6]; /* The cards firmware version */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 152 | int revision; /* The card's revision */ |
| 153 | int supports_temp; /* Wether or not the card has a temperature device */ |
| 154 | int command_mode; /* Wether or not the card is in command mode */ |
| 155 | int boot_status; /* The card's boot status */ |
| 156 | int io_addr; /* The cards I/O address */ |
| 157 | spinlock_t io_lock; /* the lock for io operations */ |
| 158 | struct timer_list timer; /* The timer that pings the watchdog */ |
| 159 | unsigned long next_heartbeat; /* the next_heartbeat for the timer */ |
| 160 | } pcwd_private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | |
| 162 | /* module parameters */ |
Wim Van Sebroeck | c324ab4 | 2006-02-12 17:12:55 +0100 | [diff] [blame] | 163 | #define QUIET 0 /* Default */ |
| 164 | #define VERBOSE 1 /* Verbose */ |
| 165 | #define DEBUG 2 /* print fancy stuff too */ |
| 166 | static int debug = QUIET; |
| 167 | module_param(debug, int, 0); |
| 168 | MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)"); |
| 169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | #define WATCHDOG_HEARTBEAT 60 /* 60 sec default heartbeat */ |
| 171 | static int heartbeat = WATCHDOG_HEARTBEAT; |
| 172 | module_param(heartbeat, int, 0); |
| 173 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<=heartbeat<=7200, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); |
| 174 | |
Andrey Panin | 4bfdf37 | 2005-07-27 11:43:58 -0700 | [diff] [blame] | 175 | static int nowayout = WATCHDOG_NOWAYOUT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | module_param(nowayout, int, 0); |
| 177 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); |
| 178 | |
| 179 | /* |
| 180 | * Internal functions |
| 181 | */ |
| 182 | |
| 183 | static int send_isa_command(int cmd) |
| 184 | { |
| 185 | int i; |
| 186 | int control_status; |
| 187 | int port0, last_port0; /* Double read for stabilising */ |
| 188 | |
Wim Van Sebroeck | c324ab4 | 2006-02-12 17:12:55 +0100 | [diff] [blame] | 189 | if (debug >= DEBUG) |
| 190 | printk(KERN_DEBUG PFX "sending following data cmd=0x%02x\n", |
| 191 | cmd); |
| 192 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | /* The WCMD bit must be 1 and the command is only 4 bits in size */ |
Wim Van Sebroeck | 8f0235d | 2006-01-09 21:56:09 +0100 | [diff] [blame] | 194 | control_status = (cmd & 0x0F) | WD_WCMD; |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 195 | outb_p(control_status, pcwd_private.io_addr + 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | udelay(ISA_COMMAND_TIMEOUT); |
| 197 | |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 198 | port0 = inb_p(pcwd_private.io_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | for (i = 0; i < 25; ++i) { |
| 200 | last_port0 = port0; |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 201 | port0 = inb_p(pcwd_private.io_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
| 203 | if (port0 == last_port0) |
| 204 | break; /* Data is stable */ |
| 205 | |
| 206 | udelay (250); |
| 207 | } |
| 208 | |
Wim Van Sebroeck | c324ab4 | 2006-02-12 17:12:55 +0100 | [diff] [blame] | 209 | if (debug >= DEBUG) |
| 210 | printk(KERN_DEBUG PFX "received following data for cmd=0x%02x: port0=0x%02x last_port0=0x%02x\n", |
| 211 | cmd, port0, last_port0); |
| 212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | return port0; |
| 214 | } |
| 215 | |
| 216 | static int set_command_mode(void) |
| 217 | { |
| 218 | int i, found=0, count=0; |
| 219 | |
| 220 | /* Set the card into command mode */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 221 | spin_lock(&pcwd_private.io_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | while ((!found) && (count < 3)) { |
| 223 | i = send_isa_command(CMD_ISA_IDLE); |
| 224 | |
| 225 | if (i == 0x00) |
| 226 | found = 1; |
| 227 | else if (i == 0xF3) { |
| 228 | /* Card does not like what we've done to it */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 229 | outb_p(0x00, pcwd_private.io_addr + 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | udelay(1200); /* Spec says wait 1ms */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 231 | outb_p(0x00, pcwd_private.io_addr + 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | udelay(ISA_COMMAND_TIMEOUT); |
| 233 | } |
| 234 | count++; |
| 235 | } |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 236 | spin_unlock(&pcwd_private.io_lock); |
| 237 | pcwd_private.command_mode = found; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
Wim Van Sebroeck | c324ab4 | 2006-02-12 17:12:55 +0100 | [diff] [blame] | 239 | if (debug >= DEBUG) |
| 240 | printk(KERN_DEBUG PFX "command_mode=%d\n", |
| 241 | pcwd_private.command_mode); |
| 242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | return(found); |
| 244 | } |
| 245 | |
| 246 | static void unset_command_mode(void) |
| 247 | { |
| 248 | /* Set the card into normal mode */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 249 | spin_lock(&pcwd_private.io_lock); |
| 250 | outb_p(0x00, pcwd_private.io_addr + 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | udelay(ISA_COMMAND_TIMEOUT); |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 252 | spin_unlock(&pcwd_private.io_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 254 | pcwd_private.command_mode = 0; |
Wim Van Sebroeck | c324ab4 | 2006-02-12 17:12:55 +0100 | [diff] [blame] | 255 | |
| 256 | if (debug >= DEBUG) |
| 257 | printk(KERN_DEBUG PFX "command_mode=%d\n", |
| 258 | pcwd_private.command_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | } |
| 260 | |
Wim Van Sebroeck | 8587521 | 2006-01-09 21:59:39 +0100 | [diff] [blame] | 261 | static inline void pcwd_check_temperature_support(void) |
| 262 | { |
| 263 | if (inb(pcwd_private.io_addr) != 0xF0) |
| 264 | pcwd_private.supports_temp = 1; |
| 265 | } |
| 266 | |
Wim Van Sebroeck | 2891b6a | 2006-02-12 16:47:34 +0100 | [diff] [blame] | 267 | static inline void pcwd_get_firmware(void) |
Wim Van Sebroeck | af3b38d | 2006-01-09 22:03:41 +0100 | [diff] [blame] | 268 | { |
| 269 | int one, ten, hund, minor; |
Wim Van Sebroeck | af3b38d | 2006-01-09 22:03:41 +0100 | [diff] [blame] | 270 | |
Wim Van Sebroeck | 6bbc20b | 2006-03-02 20:05:16 +0100 | [diff] [blame] | 271 | strcpy(pcwd_private.fw_ver_str, "ERROR"); |
Wim Van Sebroeck | af3b38d | 2006-01-09 22:03:41 +0100 | [diff] [blame] | 272 | |
| 273 | if (set_command_mode()) { |
| 274 | one = send_isa_command(CMD_ISA_VERSION_INTEGER); |
| 275 | ten = send_isa_command(CMD_ISA_VERSION_TENTH); |
| 276 | hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH); |
| 277 | minor = send_isa_command(CMD_ISA_VERSION_MINOR); |
Wim Van Sebroeck | 2891b6a | 2006-02-12 16:47:34 +0100 | [diff] [blame] | 278 | sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c", one, ten, hund, minor); |
Wim Van Sebroeck | af3b38d | 2006-01-09 22:03:41 +0100 | [diff] [blame] | 279 | } |
Wim Van Sebroeck | af3b38d | 2006-01-09 22:03:41 +0100 | [diff] [blame] | 280 | unset_command_mode(); |
Wim Van Sebroeck | 2891b6a | 2006-02-12 16:47:34 +0100 | [diff] [blame] | 281 | |
| 282 | return; |
Wim Van Sebroeck | af3b38d | 2006-01-09 22:03:41 +0100 | [diff] [blame] | 283 | } |
| 284 | |
| 285 | static inline int pcwd_get_option_switches(void) |
| 286 | { |
| 287 | int option_switches=0; |
| 288 | |
| 289 | if (set_command_mode()) { |
| 290 | /* Get switch settings */ |
| 291 | option_switches = send_isa_command(CMD_ISA_SWITCH_SETTINGS); |
| 292 | } |
| 293 | |
| 294 | unset_command_mode(); |
| 295 | return(option_switches); |
| 296 | } |
| 297 | |
| 298 | static void pcwd_show_card_info(void) |
| 299 | { |
Wim Van Sebroeck | af3b38d | 2006-01-09 22:03:41 +0100 | [diff] [blame] | 300 | int option_switches; |
| 301 | |
| 302 | /* Get some extra info from the hardware (in command/debug/diag mode) */ |
| 303 | if (pcwd_private.revision == PCWD_REVISION_A) |
| 304 | printk(KERN_INFO PFX "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", pcwd_private.io_addr); |
| 305 | else if (pcwd_private.revision == PCWD_REVISION_C) { |
Wim Van Sebroeck | 2891b6a | 2006-02-12 16:47:34 +0100 | [diff] [blame] | 306 | pcwd_get_firmware(); |
Wim Van Sebroeck | af3b38d | 2006-01-09 22:03:41 +0100 | [diff] [blame] | 307 | printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n", |
Wim Van Sebroeck | 2891b6a | 2006-02-12 16:47:34 +0100 | [diff] [blame] | 308 | pcwd_private.io_addr, pcwd_private.fw_ver_str); |
Wim Van Sebroeck | af3b38d | 2006-01-09 22:03:41 +0100 | [diff] [blame] | 309 | option_switches = pcwd_get_option_switches(); |
| 310 | printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", |
| 311 | option_switches, |
| 312 | ((option_switches & 0x10) ? "ON" : "OFF"), |
| 313 | ((option_switches & 0x08) ? "ON" : "OFF")); |
| 314 | |
| 315 | /* Reprogram internal heartbeat to 2 seconds */ |
| 316 | if (set_command_mode()) { |
| 317 | send_isa_command(CMD_ISA_DELAY_TIME_2SECS); |
| 318 | unset_command_mode(); |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | if (pcwd_private.supports_temp) |
| 323 | printk(KERN_INFO PFX "Temperature Option Detected\n"); |
| 324 | |
| 325 | if (pcwd_private.boot_status & WDIOF_CARDRESET) |
| 326 | printk(KERN_INFO PFX "Previous reboot was caused by the card\n"); |
| 327 | |
| 328 | if (pcwd_private.boot_status & WDIOF_OVERHEAT) { |
| 329 | printk(KERN_EMERG PFX "Card senses a CPU Overheat. Panicking!\n"); |
| 330 | printk(KERN_EMERG PFX "CPU Overheat\n"); |
| 331 | } |
| 332 | |
| 333 | if (pcwd_private.boot_status == 0) |
| 334 | printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n"); |
| 335 | } |
| 336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | static void pcwd_timer_ping(unsigned long data) |
| 338 | { |
| 339 | int wdrst_stat; |
| 340 | |
| 341 | /* If we got a heartbeat pulse within the WDT_INTERVAL |
| 342 | * we agree to ping the WDT */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 343 | if(time_before(jiffies, pcwd_private.next_heartbeat)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | /* Ping the watchdog */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 345 | spin_lock(&pcwd_private.io_lock); |
| 346 | if (pcwd_private.revision == PCWD_REVISION_A) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | /* Rev A cards are reset by setting the WD_WDRST bit in register 1 */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 348 | wdrst_stat = inb_p(pcwd_private.io_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | wdrst_stat &= 0x0F; |
| 350 | wdrst_stat |= WD_WDRST; |
| 351 | |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 352 | outb_p(wdrst_stat, pcwd_private.io_addr + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | } else { |
| 354 | /* Re-trigger watchdog by writing to port 0 */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 355 | outb_p(0x00, pcwd_private.io_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | /* Re-set the timer interval */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 359 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 361 | spin_unlock(&pcwd_private.io_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | } else { |
| 363 | printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n"); |
| 364 | } |
| 365 | } |
| 366 | |
| 367 | static int pcwd_start(void) |
| 368 | { |
| 369 | int stat_reg; |
| 370 | |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 371 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
| 373 | /* Start the timer */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 374 | mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | |
| 376 | /* Enable the port */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 377 | if (pcwd_private.revision == PCWD_REVISION_C) { |
| 378 | spin_lock(&pcwd_private.io_lock); |
| 379 | outb_p(0x00, pcwd_private.io_addr + 3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | udelay(ISA_COMMAND_TIMEOUT); |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 381 | stat_reg = inb_p(pcwd_private.io_addr + 2); |
| 382 | spin_unlock(&pcwd_private.io_lock); |
Wim Van Sebroeck | 8f0235d | 2006-01-09 21:56:09 +0100 | [diff] [blame] | 383 | if (stat_reg & WD_WDIS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | printk(KERN_INFO PFX "Could not start watchdog\n"); |
| 385 | return -EIO; |
| 386 | } |
| 387 | } |
Wim Van Sebroeck | c324ab4 | 2006-02-12 17:12:55 +0100 | [diff] [blame] | 388 | |
| 389 | if (debug >= VERBOSE) |
| 390 | printk(KERN_DEBUG PFX "Watchdog started\n"); |
| 391 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | return 0; |
| 393 | } |
| 394 | |
| 395 | static int pcwd_stop(void) |
| 396 | { |
| 397 | int stat_reg; |
| 398 | |
| 399 | /* Stop the timer */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 400 | del_timer(&pcwd_private.timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | |
| 402 | /* Disable the board */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 403 | if (pcwd_private.revision == PCWD_REVISION_C) { |
| 404 | spin_lock(&pcwd_private.io_lock); |
| 405 | outb_p(0xA5, pcwd_private.io_addr + 3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | udelay(ISA_COMMAND_TIMEOUT); |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 407 | outb_p(0xA5, pcwd_private.io_addr + 3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | udelay(ISA_COMMAND_TIMEOUT); |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 409 | stat_reg = inb_p(pcwd_private.io_addr + 2); |
| 410 | spin_unlock(&pcwd_private.io_lock); |
Wim Van Sebroeck | 8f0235d | 2006-01-09 21:56:09 +0100 | [diff] [blame] | 411 | if ((stat_reg & WD_WDIS) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | printk(KERN_INFO PFX "Could not stop watchdog\n"); |
| 413 | return -EIO; |
| 414 | } |
| 415 | } |
Wim Van Sebroeck | c324ab4 | 2006-02-12 17:12:55 +0100 | [diff] [blame] | 416 | |
| 417 | if (debug >= VERBOSE) |
| 418 | printk(KERN_DEBUG PFX "Watchdog stopped\n"); |
| 419 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | return 0; |
| 421 | } |
| 422 | |
| 423 | static int pcwd_keepalive(void) |
| 424 | { |
| 425 | /* user land ping */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 426 | pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
Wim Van Sebroeck | c324ab4 | 2006-02-12 17:12:55 +0100 | [diff] [blame] | 427 | |
| 428 | if (debug >= DEBUG) |
| 429 | printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n"); |
| 430 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | return 0; |
| 432 | } |
| 433 | |
| 434 | static int pcwd_set_heartbeat(int t) |
| 435 | { |
| 436 | if ((t < 2) || (t > 7200)) /* arbitrary upper limit */ |
| 437 | return -EINVAL; |
| 438 | |
| 439 | heartbeat = t; |
Wim Van Sebroeck | c324ab4 | 2006-02-12 17:12:55 +0100 | [diff] [blame] | 440 | |
| 441 | if (debug >= VERBOSE) |
| 442 | printk(KERN_DEBUG PFX "New heartbeat: %d\n", |
| 443 | heartbeat); |
| 444 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | return 0; |
| 446 | } |
| 447 | |
| 448 | static int pcwd_get_status(int *status) |
| 449 | { |
Wim Van Sebroeck | 4206f0c | 2006-02-12 16:37:36 +0100 | [diff] [blame] | 450 | int control_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | |
| 452 | *status=0; |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 453 | spin_lock(&pcwd_private.io_lock); |
| 454 | if (pcwd_private.revision == PCWD_REVISION_A) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | /* Rev A cards return status information from |
| 456 | * the base register, which is used for the |
| 457 | * temperature in other cards. */ |
Wim Van Sebroeck | 4206f0c | 2006-02-12 16:37:36 +0100 | [diff] [blame] | 458 | control_status = inb(pcwd_private.io_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | else { |
| 460 | /* Rev C cards return card status in the base |
| 461 | * address + 1 register. And use different bits |
| 462 | * to indicate a card initiated reset, and an |
| 463 | * over-temperature condition. And the reboot |
| 464 | * status can be reset. */ |
Wim Van Sebroeck | 4206f0c | 2006-02-12 16:37:36 +0100 | [diff] [blame] | 465 | control_status = inb(pcwd_private.io_addr + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | } |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 467 | spin_unlock(&pcwd_private.io_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 469 | if (pcwd_private.revision == PCWD_REVISION_A) { |
Wim Van Sebroeck | 4206f0c | 2006-02-12 16:37:36 +0100 | [diff] [blame] | 470 | if (control_status & WD_WDRST) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | *status |= WDIOF_CARDRESET; |
| 472 | |
Wim Van Sebroeck | 4206f0c | 2006-02-12 16:37:36 +0100 | [diff] [blame] | 473 | if (control_status & WD_T110) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | *status |= WDIOF_OVERHEAT; |
| 475 | if (temp_panic) { |
| 476 | printk (KERN_INFO PFX "Temperature overheat trip!\n"); |
Eric W. Biederman | 68acc05 | 2005-07-26 12:03:08 -0600 | [diff] [blame] | 477 | kernel_power_off(); |
Wim Van Sebroeck | 369fa25 | 2006-02-12 17:44:57 +0100 | [diff] [blame] | 478 | /* or should we just do a: panic(PFX "Temperature overheat trip!\n"); */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | } |
| 480 | } |
| 481 | } else { |
Wim Van Sebroeck | 4206f0c | 2006-02-12 16:37:36 +0100 | [diff] [blame] | 482 | if (control_status & WD_REVC_WTRP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | *status |= WDIOF_CARDRESET; |
| 484 | |
Wim Van Sebroeck | 4206f0c | 2006-02-12 16:37:36 +0100 | [diff] [blame] | 485 | if (control_status & WD_REVC_TTRP) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | *status |= WDIOF_OVERHEAT; |
| 487 | if (temp_panic) { |
| 488 | printk (KERN_INFO PFX "Temperature overheat trip!\n"); |
Eric W. Biederman | 68acc05 | 2005-07-26 12:03:08 -0600 | [diff] [blame] | 489 | kernel_power_off(); |
Wim Van Sebroeck | 369fa25 | 2006-02-12 17:44:57 +0100 | [diff] [blame] | 490 | /* or should we just do a: panic(PFX "Temperature overheat trip!\n"); */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | } |
| 492 | } |
| 493 | } |
| 494 | |
| 495 | return 0; |
| 496 | } |
| 497 | |
| 498 | static int pcwd_clear_status(void) |
| 499 | { |
Wim Van Sebroeck | 4206f0c | 2006-02-12 16:37:36 +0100 | [diff] [blame] | 500 | int control_status; |
| 501 | |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 502 | if (pcwd_private.revision == PCWD_REVISION_C) { |
| 503 | spin_lock(&pcwd_private.io_lock); |
Wim Van Sebroeck | 4206f0c | 2006-02-12 16:37:36 +0100 | [diff] [blame] | 504 | |
Wim Van Sebroeck | c324ab4 | 2006-02-12 17:12:55 +0100 | [diff] [blame] | 505 | if (debug >= VERBOSE) |
| 506 | printk(KERN_INFO PFX "clearing watchdog trip status\n"); |
| 507 | |
Wim Van Sebroeck | 4206f0c | 2006-02-12 16:37:36 +0100 | [diff] [blame] | 508 | control_status = inb_p(pcwd_private.io_addr + 1); |
| 509 | |
Wim Van Sebroeck | c324ab4 | 2006-02-12 17:12:55 +0100 | [diff] [blame] | 510 | if (debug >= DEBUG) { |
| 511 | printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status); |
| 512 | printk(KERN_DEBUG PFX "sending: 0x%02x\n", |
| 513 | (control_status & WD_REVC_R2DS)); |
| 514 | } |
| 515 | |
Wim Van Sebroeck | 4206f0c | 2006-02-12 16:37:36 +0100 | [diff] [blame] | 516 | /* clear reset status & Keep Relay 2 disable state as it is */ |
| 517 | outb_p((control_status & WD_REVC_R2DS), pcwd_private.io_addr + 1); |
| 518 | |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 519 | spin_unlock(&pcwd_private.io_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | } |
| 521 | return 0; |
| 522 | } |
| 523 | |
| 524 | static int pcwd_get_temperature(int *temperature) |
| 525 | { |
| 526 | /* check that port 0 gives temperature info and no command results */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 527 | if (pcwd_private.command_mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | return -1; |
| 529 | |
| 530 | *temperature = 0; |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 531 | if (!pcwd_private.supports_temp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | return -ENODEV; |
| 533 | |
| 534 | /* |
| 535 | * Convert celsius to fahrenheit, since this was |
| 536 | * the decided 'standard' for this return value. |
| 537 | */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 538 | spin_lock(&pcwd_private.io_lock); |
| 539 | *temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32; |
| 540 | spin_unlock(&pcwd_private.io_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | |
Wim Van Sebroeck | c324ab4 | 2006-02-12 17:12:55 +0100 | [diff] [blame] | 542 | if (debug >= DEBUG) { |
| 543 | printk(KERN_DEBUG PFX "temperature is: %d F\n", |
| 544 | *temperature); |
| 545 | } |
| 546 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | return 0; |
| 548 | } |
| 549 | |
| 550 | /* |
| 551 | * /dev/watchdog handling |
| 552 | */ |
| 553 | |
| 554 | static int pcwd_ioctl(struct inode *inode, struct file *file, |
| 555 | unsigned int cmd, unsigned long arg) |
| 556 | { |
| 557 | int rv; |
| 558 | int status; |
| 559 | int temperature; |
| 560 | int new_heartbeat; |
| 561 | int __user *argp = (int __user *)arg; |
| 562 | static struct watchdog_info ident = { |
| 563 | .options = WDIOF_OVERHEAT | |
| 564 | WDIOF_CARDRESET | |
| 565 | WDIOF_KEEPALIVEPING | |
| 566 | WDIOF_SETTIMEOUT | |
| 567 | WDIOF_MAGICCLOSE, |
| 568 | .firmware_version = 1, |
| 569 | .identity = "PCWD", |
| 570 | }; |
| 571 | |
| 572 | switch(cmd) { |
| 573 | default: |
Samuel Tardieu | 795b89d | 2006-09-09 17:34:31 +0200 | [diff] [blame] | 574 | return -ENOTTY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | |
| 576 | case WDIOC_GETSUPPORT: |
| 577 | if(copy_to_user(argp, &ident, sizeof(ident))) |
| 578 | return -EFAULT; |
| 579 | return 0; |
| 580 | |
| 581 | case WDIOC_GETSTATUS: |
| 582 | pcwd_get_status(&status); |
| 583 | return put_user(status, argp); |
| 584 | |
| 585 | case WDIOC_GETBOOTSTATUS: |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 586 | return put_user(pcwd_private.boot_status, argp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
| 588 | case WDIOC_GETTEMP: |
| 589 | if (pcwd_get_temperature(&temperature)) |
| 590 | return -EFAULT; |
| 591 | |
| 592 | return put_user(temperature, argp); |
| 593 | |
| 594 | case WDIOC_SETOPTIONS: |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 595 | if (pcwd_private.revision == PCWD_REVISION_C) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | { |
| 597 | if(copy_from_user(&rv, argp, sizeof(int))) |
| 598 | return -EFAULT; |
| 599 | |
| 600 | if (rv & WDIOS_DISABLECARD) |
| 601 | { |
| 602 | return pcwd_stop(); |
| 603 | } |
| 604 | |
| 605 | if (rv & WDIOS_ENABLECARD) |
| 606 | { |
| 607 | return pcwd_start(); |
| 608 | } |
| 609 | |
| 610 | if (rv & WDIOS_TEMPPANIC) |
| 611 | { |
| 612 | temp_panic = 1; |
| 613 | } |
| 614 | } |
| 615 | return -EINVAL; |
| 616 | |
| 617 | case WDIOC_KEEPALIVE: |
| 618 | pcwd_keepalive(); |
| 619 | return 0; |
| 620 | |
| 621 | case WDIOC_SETTIMEOUT: |
| 622 | if (get_user(new_heartbeat, argp)) |
| 623 | return -EFAULT; |
| 624 | |
| 625 | if (pcwd_set_heartbeat(new_heartbeat)) |
| 626 | return -EINVAL; |
| 627 | |
| 628 | pcwd_keepalive(); |
| 629 | /* Fall */ |
| 630 | |
| 631 | case WDIOC_GETTIMEOUT: |
| 632 | return put_user(heartbeat, argp); |
| 633 | } |
| 634 | |
| 635 | return 0; |
| 636 | } |
| 637 | |
| 638 | static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len, |
| 639 | loff_t *ppos) |
| 640 | { |
| 641 | if (len) { |
| 642 | if (!nowayout) { |
| 643 | size_t i; |
| 644 | |
| 645 | /* In case it was set long ago */ |
| 646 | expect_close = 0; |
| 647 | |
| 648 | for (i = 0; i != len; i++) { |
| 649 | char c; |
| 650 | |
| 651 | if (get_user(c, buf + i)) |
| 652 | return -EFAULT; |
| 653 | if (c == 'V') |
| 654 | expect_close = 42; |
| 655 | } |
| 656 | } |
| 657 | pcwd_keepalive(); |
| 658 | } |
| 659 | return len; |
| 660 | } |
| 661 | |
| 662 | static int pcwd_open(struct inode *inode, struct file *file) |
| 663 | { |
| 664 | if (!atomic_dec_and_test(&open_allowed) ) { |
Wim Van Sebroeck | c324ab4 | 2006-02-12 17:12:55 +0100 | [diff] [blame] | 665 | if (debug >= VERBOSE) |
| 666 | printk(KERN_ERR PFX "Attempt to open already opened device.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | atomic_inc( &open_allowed ); |
| 668 | return -EBUSY; |
| 669 | } |
| 670 | |
| 671 | if (nowayout) |
| 672 | __module_get(THIS_MODULE); |
| 673 | |
| 674 | /* Activate */ |
| 675 | pcwd_start(); |
| 676 | pcwd_keepalive(); |
| 677 | return nonseekable_open(inode, file); |
| 678 | } |
| 679 | |
| 680 | static int pcwd_close(struct inode *inode, struct file *file) |
| 681 | { |
| 682 | if (expect_close == 42) { |
| 683 | pcwd_stop(); |
| 684 | } else { |
| 685 | printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); |
| 686 | pcwd_keepalive(); |
| 687 | } |
| 688 | expect_close = 0; |
| 689 | atomic_inc( &open_allowed ); |
| 690 | return 0; |
| 691 | } |
| 692 | |
| 693 | /* |
| 694 | * /dev/temperature handling |
| 695 | */ |
| 696 | |
| 697 | static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count, |
| 698 | loff_t *ppos) |
| 699 | { |
| 700 | int temperature; |
| 701 | |
| 702 | if (pcwd_get_temperature(&temperature)) |
| 703 | return -EFAULT; |
| 704 | |
| 705 | if (copy_to_user(buf, &temperature, 1)) |
| 706 | return -EFAULT; |
| 707 | |
| 708 | return 1; |
| 709 | } |
| 710 | |
| 711 | static int pcwd_temp_open(struct inode *inode, struct file *file) |
| 712 | { |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 713 | if (!pcwd_private.supports_temp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | return -ENODEV; |
| 715 | |
| 716 | return nonseekable_open(inode, file); |
| 717 | } |
| 718 | |
| 719 | static int pcwd_temp_close(struct inode *inode, struct file *file) |
| 720 | { |
| 721 | return 0; |
| 722 | } |
| 723 | |
| 724 | /* |
| 725 | * Notify system |
| 726 | */ |
| 727 | |
| 728 | static int pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) |
| 729 | { |
| 730 | if (code==SYS_DOWN || code==SYS_HALT) { |
| 731 | /* Turn the WDT off */ |
| 732 | pcwd_stop(); |
| 733 | } |
| 734 | |
| 735 | return NOTIFY_DONE; |
| 736 | } |
| 737 | |
| 738 | /* |
| 739 | * Kernel Interfaces |
| 740 | */ |
| 741 | |
Arjan van de Ven | 62322d2 | 2006-07-03 00:24:21 -0700 | [diff] [blame] | 742 | static const struct file_operations pcwd_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | .owner = THIS_MODULE, |
| 744 | .llseek = no_llseek, |
| 745 | .write = pcwd_write, |
| 746 | .ioctl = pcwd_ioctl, |
| 747 | .open = pcwd_open, |
| 748 | .release = pcwd_close, |
| 749 | }; |
| 750 | |
| 751 | static struct miscdevice pcwd_miscdev = { |
| 752 | .minor = WATCHDOG_MINOR, |
| 753 | .name = "watchdog", |
| 754 | .fops = &pcwd_fops, |
| 755 | }; |
| 756 | |
Arjan van de Ven | 62322d2 | 2006-07-03 00:24:21 -0700 | [diff] [blame] | 757 | static const struct file_operations pcwd_temp_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | .owner = THIS_MODULE, |
| 759 | .llseek = no_llseek, |
| 760 | .read = pcwd_temp_read, |
| 761 | .open = pcwd_temp_open, |
| 762 | .release = pcwd_temp_close, |
| 763 | }; |
| 764 | |
| 765 | static struct miscdevice temp_miscdev = { |
| 766 | .minor = TEMP_MINOR, |
| 767 | .name = "temperature", |
| 768 | .fops = &pcwd_temp_fops, |
| 769 | }; |
| 770 | |
| 771 | static struct notifier_block pcwd_notifier = { |
| 772 | .notifier_call = pcwd_notify_sys, |
| 773 | }; |
| 774 | |
| 775 | /* |
| 776 | * Init & exit routines |
| 777 | */ |
| 778 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | static inline int get_revision(void) |
| 780 | { |
| 781 | int r = PCWD_REVISION_C; |
| 782 | |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 783 | spin_lock(&pcwd_private.io_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | /* REV A cards use only 2 io ports; test |
| 785 | * presumes a floating bus reads as 0xff. */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 786 | if ((inb(pcwd_private.io_addr + 2) == 0xFF) || |
| 787 | (inb(pcwd_private.io_addr + 3) == 0xFF)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | r=PCWD_REVISION_A; |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 789 | spin_unlock(&pcwd_private.io_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | |
| 791 | return r; |
| 792 | } |
| 793 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | static int __devinit pcwatchdog_init(int base_addr) |
| 795 | { |
| 796 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | |
| 798 | cards_found++; |
| 799 | if (cards_found == 1) |
| 800 | printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n", WD_VER); |
| 801 | |
| 802 | if (cards_found > 1) { |
| 803 | printk(KERN_ERR PFX "This driver only supports 1 device\n"); |
| 804 | return -ENODEV; |
| 805 | } |
| 806 | |
| 807 | if (base_addr == 0x0000) { |
| 808 | printk(KERN_ERR PFX "No I/O-Address for card detected\n"); |
| 809 | return -ENODEV; |
| 810 | } |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 811 | pcwd_private.io_addr = base_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | |
| 813 | /* Check card's revision */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 814 | pcwd_private.revision = get_revision(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 816 | if (!request_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 818 | pcwd_private.io_addr); |
| 819 | pcwd_private.io_addr = 0x0000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | return -EIO; |
| 821 | } |
| 822 | |
| 823 | /* Initial variables */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 824 | pcwd_private.supports_temp = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | temp_panic = 0; |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 826 | pcwd_private.boot_status = 0x0000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | |
| 828 | /* get the boot_status */ |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 829 | pcwd_get_status(&pcwd_private.boot_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | |
| 831 | /* clear the "card caused reboot" flag */ |
| 832 | pcwd_clear_status(); |
| 833 | |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 834 | init_timer(&pcwd_private.timer); |
| 835 | pcwd_private.timer.function = pcwd_timer_ping; |
| 836 | pcwd_private.timer.data = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
| 838 | /* Disable the board */ |
| 839 | pcwd_stop(); |
| 840 | |
| 841 | /* Check whether or not the card supports the temperature device */ |
Wim Van Sebroeck | 8587521 | 2006-01-09 21:59:39 +0100 | [diff] [blame] | 842 | pcwd_check_temperature_support(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | |
Wim Van Sebroeck | af3b38d | 2006-01-09 22:03:41 +0100 | [diff] [blame] | 844 | /* Show info about the card itself */ |
| 845 | pcwd_show_card_info(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | |
| 847 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ |
Wim Van Sebroeck | fd41fa6 | 2005-12-10 14:22:37 +0100 | [diff] [blame] | 848 | if (pcwd_set_heartbeat(heartbeat)) { |
| 849 | pcwd_set_heartbeat(WATCHDOG_HEARTBEAT); |
| 850 | printk(KERN_INFO PFX "heartbeat value must be 2<=heartbeat<=7200, using %d\n", |
| 851 | WATCHDOG_HEARTBEAT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | } |
| 853 | |
| 854 | ret = register_reboot_notifier(&pcwd_notifier); |
| 855 | if (ret) { |
| 856 | printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", |
| 857 | ret); |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 858 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
| 859 | pcwd_private.io_addr = 0x0000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | return ret; |
| 861 | } |
| 862 | |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 863 | if (pcwd_private.supports_temp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | ret = misc_register(&temp_miscdev); |
| 865 | if (ret) { |
| 866 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", |
| 867 | TEMP_MINOR, ret); |
| 868 | unregister_reboot_notifier(&pcwd_notifier); |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 869 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
| 870 | pcwd_private.io_addr = 0x0000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | return ret; |
| 872 | } |
| 873 | } |
| 874 | |
| 875 | ret = misc_register(&pcwd_miscdev); |
| 876 | if (ret) { |
| 877 | printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", |
| 878 | WATCHDOG_MINOR, ret); |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 879 | if (pcwd_private.supports_temp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | misc_deregister(&temp_miscdev); |
| 881 | unregister_reboot_notifier(&pcwd_notifier); |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 882 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
| 883 | pcwd_private.io_addr = 0x0000; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | return ret; |
| 885 | } |
| 886 | |
| 887 | printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", |
| 888 | heartbeat, nowayout); |
| 889 | |
| 890 | return 0; |
| 891 | } |
| 892 | |
| 893 | static void __devexit pcwatchdog_exit(void) |
| 894 | { |
| 895 | /* Disable the board */ |
| 896 | if (!nowayout) |
| 897 | pcwd_stop(); |
| 898 | |
| 899 | /* Deregister */ |
| 900 | misc_deregister(&pcwd_miscdev); |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 901 | if (pcwd_private.supports_temp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | misc_deregister(&temp_miscdev); |
| 903 | unregister_reboot_notifier(&pcwd_notifier); |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 904 | release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
| 905 | pcwd_private.io_addr = 0x0000; |
Wim Van Sebroeck | f1c3a05 | 2005-12-10 14:36:24 +0100 | [diff] [blame] | 906 | cards_found--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | } |
| 908 | |
| 909 | /* |
| 910 | * The ISA cards have a heartbeat bit in one of the registers, which |
| 911 | * register is card dependent. The heartbeat bit is monitored, and if |
| 912 | * found, is considered proof that a Berkshire card has been found. |
| 913 | * The initial rate is once per second at board start up, then twice |
| 914 | * per second for normal operation. |
| 915 | */ |
| 916 | static int __init pcwd_checkcard(int base_addr) |
| 917 | { |
| 918 | int port0, last_port0; /* Reg 0, in case it's REV A */ |
| 919 | int port1, last_port1; /* Register 1 for REV C cards */ |
| 920 | int i; |
| 921 | int retval; |
| 922 | |
| 923 | if (!request_region (base_addr, 4, "PCWD")) { |
| 924 | printk (KERN_INFO PFX "Port 0x%04x unavailable\n", base_addr); |
| 925 | return 0; |
| 926 | } |
| 927 | |
| 928 | retval = 0; |
| 929 | |
| 930 | port0 = inb_p(base_addr); /* For REV A boards */ |
| 931 | port1 = inb_p(base_addr + 1); /* For REV C boards */ |
| 932 | if (port0 != 0xff || port1 != 0xff) { |
| 933 | /* Not an 'ff' from a floating bus, so must be a card! */ |
| 934 | for (i = 0; i < 4; ++i) { |
| 935 | |
| 936 | msleep(500); |
| 937 | |
| 938 | last_port0 = port0; |
| 939 | last_port1 = port1; |
| 940 | |
| 941 | port0 = inb_p(base_addr); |
| 942 | port1 = inb_p(base_addr + 1); |
| 943 | |
| 944 | /* Has either hearbeat bit changed? */ |
| 945 | if ((port0 ^ last_port0) & WD_HRTBT || |
| 946 | (port1 ^ last_port1) & WD_REVC_HRBT) { |
| 947 | retval = 1; |
| 948 | break; |
| 949 | } |
| 950 | } |
| 951 | } |
| 952 | release_region (base_addr, 4); |
| 953 | |
| 954 | return retval; |
| 955 | } |
| 956 | |
| 957 | /* |
| 958 | * These are the auto-probe addresses available. |
| 959 | * |
| 960 | * Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350. |
| 961 | * Revision A has an address range of 2 addresses, while Revision C has 4. |
| 962 | */ |
| 963 | static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 }; |
| 964 | |
| 965 | static int __init pcwd_init_module(void) |
| 966 | { |
| 967 | int i, found = 0; |
| 968 | |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 969 | spin_lock_init(&pcwd_private.io_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | |
| 971 | for (i = 0; pcwd_ioports[i] != 0; i++) { |
| 972 | if (pcwd_checkcard(pcwd_ioports[i])) { |
| 973 | if (!(pcwatchdog_init(pcwd_ioports[i]))) |
| 974 | found++; |
| 975 | } |
| 976 | } |
| 977 | |
| 978 | if (!found) { |
| 979 | printk (KERN_INFO PFX "No card detected, or port not available\n"); |
| 980 | return -ENODEV; |
| 981 | } |
| 982 | |
| 983 | return 0; |
| 984 | } |
| 985 | |
| 986 | static void __exit pcwd_cleanup_module(void) |
| 987 | { |
Wim Van Sebroeck | a2be878 | 2006-01-09 21:53:33 +0100 | [diff] [blame] | 988 | if (pcwd_private.io_addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | pcwatchdog_exit(); |
Wim Van Sebroeck | 369fa25 | 2006-02-12 17:44:57 +0100 | [diff] [blame] | 990 | |
| 991 | printk(KERN_INFO PFX "Watchdog Module Unloaded.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | } |
| 993 | |
| 994 | module_init(pcwd_init_module); |
| 995 | module_exit(pcwd_cleanup_module); |
| 996 | |
| 997 | MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>"); |
| 998 | MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver"); |
| 999 | MODULE_LICENSE("GPL"); |
| 1000 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
| 1001 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |