/* * PC Watchdog Driver * by Ken Hollis (khollis@bitgate.com) * * Permission granted from Simon Machell (smachell@berkprod.com) * Written for the Linux Kernel, and GPLed by Ken Hollis * * 960107 Added request_region routines, modulized the whole thing. * 960108 Fixed end-of-file pointer (Thanks to Dan Hollis), added * WD_TIMEOUT define. * 960216 Added eof marker on the file, and changed verbose messages. * 960716 Made functional and cosmetic changes to the source for * inclusion in Linux 2.0.x kernels, thanks to Alan Cox. * 960717 Removed read/seek routines, replaced with ioctl. Also, added * check_region command due to Alan's suggestion. * 960821 Made changes to compile in newer 2.0.x kernels. Added * "cold reboot sense" entry. * 960825 Made a few changes to code, deleted some defines and made * typedefs to replace them. Made heartbeat reset only available * via ioctl, and removed the write routine. * 960828 Added new items for PC Watchdog Rev.C card. * 960829 Changed around all of the IOCTLs, added new features, * added watchdog disable/re-enable routines. Added firmware * version reporting. Added read routine for temperature. * Removed some extra defines, added an autodetect Revision * routine. * 961006 Revised some documentation, fixed some cosmetic bugs. Made * drivers to panic the system if it's overheating at bootup. * 961118 Changed some verbiage on some of the output, tidied up * code bits, and added compatibility to 2.1.x. * 970912 Enabled board on open and disable on close. * 971107 Took account of recent VFS changes (broke read). * 971210 Disable board on initialisation in case board already ticking. * 971222 Changed open/close for temperature handling * Michael Meskes <meskes@debian.org>. * 980112 Used minor numbers from include/linux/miscdevice.h * 990403 Clear reset status after reading control status register in * pcwd_showprevstate(). [Marc Boucher <marc@mbsi.ca>] * 990605 Made changes to code to support Firmware 1.22a, added * fairly useless proc entry. * 990610 removed said useless proc code for the merge <alan> * 000403 Removed last traces of proc code. <davej> * 011214 Added nowayout module option to override * CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com> * Added timeout module option to override default */ /* * A bells and whistles driver is available from http://www.pcwd.de/ * More info available at http://www.berkprod.com/ or * http://www.pcwatchdog.com/ */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> /* For module specific items */ #include <linux/moduleparam.h> /* For new moduleparam's */ #include <linux/types.h> /* For standard types (like size_t) */ #include <linux/errno.h> /* For the -ENODEV/... values */ #include <linux/kernel.h> /* For printk/panic/... */ #include <linux/delay.h> /* For mdelay function */ #include <linux/timer.h> /* For timer related operations */ #include <linux/jiffies.h> /* For jiffies stuff */ #include <linux/miscdevice.h> /* For struct miscdevice */ #include <linux/watchdog.h> /* For the watchdog specific items */ #include <linux/reboot.h> /* For kernel_power_off() */ #include <linux/init.h> /* For __init/__exit/... */ #include <linux/fs.h> /* For file operations */ #include <linux/isa.h> /* For isa devices */ #include <linux/ioport.h> /* For io-port access */ #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ #include <linux/uaccess.h> /* For copy_to_user/put_user/... */ #include <linux/io.h> /* For inb/outb/... */ /* Module and version information */ #define WATCHDOG_VERSION "1.20" #define WATCHDOG_DATE "18 Feb 2007" #define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog" #define WATCHDOG_NAME "pcwd" #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION "\n" /* * It should be noted that PCWD_REVISION_B was removed because A and B * are essentially the same types of card, with the exception that B * has temperature reporting. Since I didn't receive a Rev.B card, * the Rev.B card is not supported. (It's a good thing too, as they * are no longer in production.) */ #define PCWD_REVISION_A 1 #define PCWD_REVISION_C 2 /* * These are the auto-probe addresses available. * * Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350. * Revision A has an address range of 2 addresses, while Revision C has 4. */ #define PCWD_ISA_NR_CARDS 3 static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 }; /* * These are the defines that describe the control status bits for the * PCI-PC Watchdog card. */ /* Port 1 : Control Status #1 for the PC Watchdog card, revision A. */ #define WD_WDRST 0x01 /* Previously reset state */ #define WD_T110 0x02 /* Temperature overheat sense */ #define WD_HRTBT 0x04 /* Heartbeat sense */ #define WD_RLY2 0x08 /* External relay triggered */ #define WD_SRLY2 0x80 /* Software external relay triggered */ /* Port 1 : Control Status #1 for the PC Watchdog card, revision C. */ #define WD_REVC_WTRP 0x01 /* Watchdog Trip status */ #define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */ #define WD_REVC_TTRP 0x04 /* Temperature Trip status */ #define WD_REVC_RL2A 0x08 /* Relay 2 activated by on-board processor */ #define WD_REVC_RL1A 0x10 /* Relay 1 active */ #define WD_REVC_R2DS 0x40 /* Relay 2 disable */ #define WD_REVC_RLY2 0x80 /* Relay 2 activated? */ /* Port 2 : Control Status #2 */ #define WD_WDIS 0x10 /* Watchdog Disabled */ #define WD_ENTP 0x20 /* Watchdog Enable Temperature Trip */ #define WD_SSEL 0x40 /* Watchdog Switch Select (1:SW1 <-> 0:SW2) */ #define WD_WCMD 0x80 /* Watchdog Command Mode */ /* max. time we give an ISA watchdog card to process a command */ /* 500ms for each 4 bit response (according to spec.) */ #define ISA_COMMAND_TIMEOUT 1000 /* Watchdog's internal commands */ #define CMD_ISA_IDLE 0x00 #define CMD_ISA_VERSION_INTEGER 0x01 #define CMD_ISA_VERSION_TENTH 0x02 #define CMD_ISA_VERSION_HUNDRETH 0x03 #define CMD_ISA_VERSION_MINOR 0x04 #define CMD_ISA_SWITCH_SETTINGS 0x05 #define CMD_ISA_RESET_PC 0x06 #define CMD_ISA_ARM_0 0x07 #define CMD_ISA_ARM_30 0x08 #define CMD_ISA_ARM_60 0x09 #define CMD_ISA_DELAY_TIME_2SECS 0x0A #define CMD_ISA_DELAY_TIME_4SECS 0x0B #define CMD_ISA_DELAY_TIME_8SECS 0x0C #define CMD_ISA_RESET_RELAYS 0x0D /* Watchdog's Dip Switch heartbeat values */ static const int heartbeat_tbl[] = { 20, /* OFF-OFF-OFF = 20 Sec */ 40, /* OFF-OFF-ON = 40 Sec */ 60, /* OFF-ON-OFF = 1 Min */ 300, /* OFF-ON-ON = 5 Min */ 600, /* ON-OFF-OFF = 10 Min */ 1800, /* ON-OFF-ON = 30 Min */ 3600, /* ON-ON-OFF = 1 Hour */ 7200, /* ON-ON-ON = 2 hour */ }; /* * We are using an kernel timer to do the pinging of the watchdog * every ~500ms. We try to set the internal heartbeat of the * watchdog to 2 ms. */ #define WDT_INTERVAL (HZ/2+1) /* We can only use 1 card due to the /dev/watchdog restriction */ static int cards_found; /* internal variables */ static unsigned long open_allowed; static char expect_close; static int temp_panic; /* this is private data for each ISA-PC watchdog card */ static struct { char fw_ver_str[6]; /* The cards firmware version */ int revision; /* The card's revision */ int supports_temp; /* Whether or not the card has a temperature device */ int command_mode; /* Whether or not the card is in command mode */ int boot_status; /* The card's boot status */ int io_addr; /* The cards I/O address */ spinlock_t io_lock; /* the lock for io operations */ struct timer_list timer; /* The timer that pings the watchdog */ unsigned long next_heartbeat; /* the next_heartbeat for the timer */ } pcwd_private; /* module parameters */ #define QUIET 0 /* Default */ #define VERBOSE 1 /* Verbose */ #define DEBUG 2 /* print fancy stuff too */ static int debug = QUIET; module_param(debug, int, 0); MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)"); /* default heartbeat = delay-time from dip-switches */ #define WATCHDOG_HEARTBEAT 0 static int heartbeat = WATCHDOG_HEARTBEAT; module_param(heartbeat, int, 0); MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. " "(2 <= heartbeat <= 7200 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); /* * Internal functions */ static int send_isa_command(int cmd) { int i; int control_status; int port0, last_port0; /* Double read for stabilising */ if (debug >= DEBUG) pr_debug("sending following data cmd=0x%02x\n", cmd); /* The WCMD bit must be 1 and the command is only 4 bits in size */ control_status = (cmd & 0x0F) | WD_WCMD; outb_p(control_status, pcwd_private.io_addr + 2); udelay(ISA_COMMAND_TIMEOUT); port0 = inb_p(pcwd_private.io_addr); for (i = 0; i < 25; ++i) { last_port0 = port0; port0 = inb_p(pcwd_private.io_addr); if (port0 == last_port0) break; /* Data is stable */ udelay(250); } if (debug >= DEBUG) pr_debug("received following data for cmd=0x%02x: port0=0x%02x last_port0=0x%02x\n", cmd, port0, last_port0); return port0; } static int set_command_mode(void) { int i, found = 0, count = 0; /* Set the card into command mode */ spin_lock(&pcwd_private.io_lock); while ((!found) && (count < 3)) { i = send_isa_command(CMD_ISA_IDLE); if (i == 0x00) found = 1; else if (i == 0xF3) { /* Card does not like what we've done to it */ outb_p(0x00, pcwd_private.io_addr + 2); udelay(1200); /* Spec says wait 1ms */ outb_p(0x00, pcwd_private.io_addr + 2); udelay(ISA_COMMAND_TIMEOUT); } count++; } spin_unlock(&pcwd_private.io_lock); pcwd_private.command_mode = found; if (debug >= DEBUG) pr_debug("command_mode=%d\n", pcwd_private.command_mode); return found; } static void unset_command_mode(void) { /* Set the card into normal mode */ spin_lock(&pcwd_private.io_lock); outb_p(0x00, pcwd_private.io_addr + 2); udelay(ISA_COMMAND_TIMEOUT); spin_unlock(&pcwd_private.io_lock); pcwd_private.command_mode = 0; if (debug >= DEBUG) pr_debug("command_mode=%d\n", pcwd_private.command_mode); } static inline void pcwd_check_temperature_support(void) { if (inb(pcwd_private.io_addr) != 0xF0) pcwd_private.supports_temp = 1; } static inline void pcwd_get_firmware(void) { int one, ten, hund, minor; strcpy(pcwd_private.fw_ver_str, "ERROR"); if (set_command_mode()) { one = send_isa_command(CMD_ISA_VERSION_INTEGER); ten = send_isa_command(CMD_ISA_VERSION_TENTH); hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH); minor = send_isa_command(CMD_ISA_VERSION_MINOR); sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c", one, ten, hund, minor); } unset_command_mode(); return; } static inline int pcwd_get_option_switches(void) { int option_switches = 0; if (set_command_mode()) { /* Get switch settings */ option_switches = send_isa_command(CMD_ISA_SWITCH_SETTINGS); } unset_command_mode(); return option_switches; } static void pcwd_show_card_info(void) { int option_switches; /* Get some extra info from the hardware (in command/debug/diag mode) */ if (pcwd_private.revision == PCWD_REVISION_A) pr_info("ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", pcwd_private.io_addr); else if (pcwd_private.revision == PCWD_REVISION_C) { pcwd_get_firmware(); pr_info("ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n", pcwd_private.io_addr, pcwd_private.fw_ver_str); option_switches = pcwd_get_option_switches(); pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", option_switches, ((option_switches & 0x10) ? "ON" : "OFF"), ((option_switches & 0x08) ? "ON" : "OFF")); /* Reprogram internal heartbeat to 2 seconds */ if (set_command_mode()) { send_isa_command(CMD_ISA_DELAY_TIME_2SECS); unset_command_mode(); } } if (pcwd_private.supports_temp) pr_info("Temperature Option Detected\n"); if (pcwd_private.boot_status & WDIOF_CARDRESET) pr_info("Previous reboot was caused by the card\n"); if (pcwd_private.boot_status & WDIOF_OVERHEAT) { pr_emerg("Card senses a CPU Overheat. Panicking!\n"); pr_emerg("CPU Overheat\n"); } if (pcwd_private.boot_status == 0) pr_info("No previous trip detected - Cold boot or reset\n"); } static void pcwd_timer_ping(unsigned long data) { int wdrst_stat; /* If we got a heartbeat pulse within the WDT_INTERVAL * we agree to ping the WDT */ if (time_before(jiffies, pcwd_private.next_heartbeat)) { /* Ping the watchdog */ spin_lock(&pcwd_private.io_lock); if (pcwd_private.revision == PCWD_REVISION_A) { /* Rev A cards are reset by setting the WD_WDRST bit in register 1 */ wdrst_stat = inb_p(pcwd_private.io_addr); wdrst_stat &= 0x0F; wdrst_stat |= WD_WDRST; outb_p(wdrst_stat, pcwd_private.io_addr + 1); } else { /* Re-trigger watchdog by writing to port 0 */ outb_p(0x00, pcwd_private.io_addr); } /* Re-set the timer interval */ mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); spin_unlock(&pcwd_private.io_lock); } else { pr_warn("Heartbeat lost! Will not ping the watchdog\n"); } } static int pcwd_start(void) { int stat_reg; pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); /* Start the timer */ mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); /* Enable the port */ if (pcwd_private.revision == PCWD_REVISION_C) { spin_lock(&pcwd_private.io_lock); outb_p(0x00, pcwd_private.io_addr + 3); udelay(ISA_COMMAND_TIMEOUT); stat_reg = inb_p(pcwd_private.io_addr + 2); spin_unlock(&pcwd_private.io_lock); if (stat_reg & WD_WDIS) { pr_info("Could not start watchdog\n"); return -EIO; } } if (debug >= VERBOSE) pr_debug("Watchdog started\n"); return 0; } static int pcwd_stop(void) { int stat_reg; /* Stop the timer */ del_timer(&pcwd_private.timer); /* Disable the board */ if (pcwd_private.revision == PCWD_REVISION_C) { spin_lock(&pcwd_private.io_lock); outb_p(0xA5, pcwd_private.io_addr + 3); udelay(ISA_COMMAND_TIMEOUT); outb_p(0xA5, pcwd_private.io_addr + 3); udelay(ISA_COMMAND_TIMEOUT); stat_reg = inb_p(pcwd_private.io_addr + 2); spin_unlock(&pcwd_private.io_lock); if ((stat_reg & WD_WDIS) == 0) { pr_info("Could not stop watchdog\n"); return -EIO; } } if (debug >= VERBOSE) pr_debug("Watchdog stopped\n"); return 0; } static int pcwd_keepalive(void) { /* user land ping */ pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); if (debug >= DEBUG) pr_debug("Watchdog keepalive signal send\n"); return 0; } static int pcwd_set_heartbeat(int t) { if (t < 2 || t > 7200) /* arbitrary upper limit */ return -EINVAL; heartbeat = t; if (debug >= VERBOSE) pr_debug("New heartbeat: %d\n", heartbeat); return 0; } static int pcwd_get_status(int *status) { int control_status; *status = 0; spin_lock(&pcwd_private.io_lock); if (pcwd_private.revision == PCWD_REVISION_A) /* Rev A cards return status information from * the base register, which is used for the * temperature in other cards. */ control_status = inb(pcwd_private.io_addr); else { /* Rev C cards return card status in the base * address + 1 register. And use different bits * to indicate a card initiated reset, and an * over-temperature condition. And the reboot * status can be reset. */ control_status = inb(pcwd_private.io_addr + 1); } spin_unlock(&pcwd_private.io_lock); if (pcwd_private.revision == PCWD_REVISION_A) { if (control_status & WD_WDRST) *status |= WDIOF_CARDRESET; if (control_status & WD_T110) { *status |= WDIOF_OVERHEAT; if (temp_panic) { pr_info("Temperature overheat trip!\n"); kernel_power_off(); } } } else { if (control_status & WD_REVC_WTRP) *status |= WDIOF_CARDRESET; if (control_status & WD_REVC_TTRP) { *status |= WDIOF_OVERHEAT; if (temp_panic) { pr_info("Temperature overheat trip!\n"); kernel_power_off(); } } } return 0; } static int pcwd_clear_status(void) { int control_status; if (pcwd_private.revision == PCWD_REVISION_C) { spin_lock(&pcwd_private.io_lock); if (debug >= VERBOSE) pr_info("clearing watchdog trip status\n"); control_status = inb_p(pcwd_private.io_addr + 1); if (debug >= DEBUG) { pr_debug("status was: 0x%02x\n", control_status); pr_debug("sending: 0x%02x\n", (control_status & WD_REVC_R2DS)); } /* clear reset status & Keep Relay 2 disable state as it is */ outb_p((control_status & WD_REVC_R2DS), pcwd_private.io_addr + 1); spin_unlock(&pcwd_private.io_lock); } return 0; } static int pcwd_get_temperature(int *temperature) { /* check that port 0 gives temperature info and no command results */ if (pcwd_private.command_mode) return -1; *temperature = 0; if (!pcwd_private.supports_temp) return -ENODEV; /* * Convert celsius to fahrenheit, since this was * the decided 'standard' for this return value. */ spin_lock(&pcwd_private.io_lock); *temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32; spin_unlock(&pcwd_private.io_lock); if (debug >= DEBUG) { pr_debug("temperature is: %d F\n", *temperature); } return 0; } /* * /dev/watchdog handling */ static long pcwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { int rv; int status; int temperature; int new_heartbeat; int __user *argp = (int __user *)arg; static const struct watchdog_info ident = { .options = WDIOF_OVERHEAT | WDIOF_CARDRESET | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, .firmware_version = 1, .identity = "PCWD", }; switch (cmd) { case WDIOC_GETSUPPORT: if (copy_to_user(argp, &ident, sizeof(ident))) return -EFAULT; return 0; case WDIOC_GETSTATUS: pcwd_get_status(&status); return put_user(status, argp); case WDIOC_GETBOOTSTATUS: return put_user(pcwd_private.boot_status, argp); case WDIOC_GETTEMP: if (pcwd_get_temperature(&temperature)) return -EFAULT; return put_user(temperature, argp); case WDIOC_SETOPTIONS: if (pcwd_private.revision == PCWD_REVISION_C) { if (get_user(rv, argp)) return -EFAULT; if (rv & WDIOS_DISABLECARD) { status = pcwd_stop(); if (status < 0) return status; } if (rv & WDIOS_ENABLECARD) { status = pcwd_start(); if (status < 0) return status; } if (rv & WDIOS_TEMPPANIC) temp_panic = 1; } return -EINVAL; case WDIOC_KEEPALIVE: pcwd_keepalive(); return 0; case WDIOC_SETTIMEOUT: if (get_user(new_heartbeat, argp)) return -EFAULT; if (pcwd_set_heartbeat(new_heartbeat)) return -EINVAL; pcwd_keepalive(); /* Fall */ case WDIOC_GETTIMEOUT: return put_user(heartbeat, argp); default: return -ENOTTY; } return 0; } static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len, loff_t *ppos) { if (len) { if (!nowayout) { size_t i; /* In case it was set long ago */ expect_close = 0; for (i = 0; i != len; i++) { char c; if (get_user(c, buf + i)) return -EFAULT; if (c == 'V') expect_close = 42; } } pcwd_keepalive(); } return len; } static int pcwd_open(struct inode *inode, struct file *file) { if (test_and_set_bit(0, &open_allowed)) return -EBUSY; if (nowayout) __module_get(THIS_MODULE); /* Activate */ pcwd_start(); pcwd_keepalive(); return nonseekable_open(inode, file); } static int pcwd_close(struct inode *inode, struct file *file) { if (expect_close == 42) pcwd_stop(); else { pr_crit("Unexpected close, not stopping watchdog!\n"); pcwd_keepalive(); } expect_close = 0; clear_bit(0, &open_allowed); return 0; } /* * /dev/temperature handling */ static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { int temperature; if (pcwd_get_temperature(&temperature)) return -EFAULT; if (copy_to_user(buf, &temperature, 1)) return -EFAULT; return 1; } static int pcwd_temp_open(struct inode *inode, struct file *file) { if (!pcwd_private.supports_temp) return -ENODEV; return nonseekable_open(inode, file); } static int pcwd_temp_close(struct inode *inode, struct file *file) { return 0; } /* * Kernel Interfaces */ static const struct file_operations pcwd_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = pcwd_write, .unlocked_ioctl = pcwd_ioctl, .open = pcwd_open, .release = pcwd_close, }; static struct miscdevice pcwd_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &pcwd_fops, }; static const struct file_operations pcwd_temp_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .read = pcwd_temp_read, .open = pcwd_temp_open, .release = pcwd_temp_close, }; static struct miscdevice temp_miscdev = { .minor = TEMP_MINOR, .name = "temperature", .fops = &pcwd_temp_fops, }; /* * Init & exit routines */ static inline int get_revision(void) { int r = PCWD_REVISION_C; spin_lock(&pcwd_private.io_lock); /* REV A cards use only 2 io ports; test * presumes a floating bus reads as 0xff. */ if ((inb(pcwd_private.io_addr + 2) == 0xFF) || (inb(pcwd_private.io_addr + 3) == 0xFF)) r = PCWD_REVISION_A; spin_unlock(&pcwd_private.io_lock); return r; } /* * The ISA cards have a heartbeat bit in one of the registers, which * register is card dependent. The heartbeat bit is monitored, and if * found, is considered proof that a Berkshire card has been found. * The initial rate is once per second at board start up, then twice * per second for normal operation. */ static int pcwd_isa_match(struct device *dev, unsigned int id) { int base_addr = pcwd_ioports[id]; int port0, last_port0; /* Reg 0, in case it's REV A */ int port1, last_port1; /* Register 1 for REV C cards */ int i; int retval; if (debug >= DEBUG) pr_debug("pcwd_isa_match id=%d\n", id); if (!request_region(base_addr, 4, "PCWD")) { pr_info("Port 0x%04x unavailable\n", base_addr); return 0; } retval = 0; port0 = inb_p(base_addr); /* For REV A boards */ port1 = inb_p(base_addr + 1); /* For REV C boards */ if (port0 != 0xff || port1 != 0xff) { /* Not an 'ff' from a floating bus, so must be a card! */ for (i = 0; i < 4; ++i) { msleep(500); last_port0 = port0; last_port1 = port1; port0 = inb_p(base_addr); port1 = inb_p(base_addr + 1); /* Has either hearbeat bit changed? */ if ((port0 ^ last_port0) & WD_HRTBT || (port1 ^ last_port1) & WD_REVC_HRBT) { retval = 1; break; } } } release_region(base_addr, 4); return retval; } static int pcwd_isa_probe(struct device *dev, unsigned int id) { int ret; if (debug >= DEBUG) pr_debug("pcwd_isa_probe id=%d\n", id); cards_found++; if (cards_found == 1) pr_info("v%s Ken Hollis (kenji@bitgate.com)\n", WATCHDOG_VERSION); if (cards_found > 1) { pr_err("This driver only supports 1 device\n"); return -ENODEV; } if (pcwd_ioports[id] == 0x0000) { pr_err("No I/O-Address for card detected\n"); return -ENODEV; } pcwd_private.io_addr = pcwd_ioports[id]; spin_lock_init(&pcwd_private.io_lock); /* Check card's revision */ pcwd_private.revision = get_revision(); if (!request_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) { pr_err("I/O address 0x%04x already in use\n", pcwd_private.io_addr); ret = -EIO; goto error_request_region; } /* Initial variables */ pcwd_private.supports_temp = 0; temp_panic = 0; pcwd_private.boot_status = 0x0000; /* get the boot_status */ pcwd_get_status(&pcwd_private.boot_status); /* clear the "card caused reboot" flag */ pcwd_clear_status(); setup_timer(&pcwd_private.timer, pcwd_timer_ping, 0); /* Disable the board */ pcwd_stop(); /* Check whether or not the card supports the temperature device */ pcwd_check_temperature_support(); /* Show info about the card itself */ pcwd_show_card_info(); /* If heartbeat = 0 then we use the heartbeat from the dip-switches */ if (heartbeat == 0) heartbeat = heartbeat_tbl[(pcwd_get_option_switches() & 0x07)]; /* Check that the heartbeat value is within it's range; if not reset to the default */ if (pcwd_set_heartbeat(heartbeat)) { pcwd_set_heartbeat(WATCHDOG_HEARTBEAT); pr_info("heartbeat value must be 2 <= heartbeat <= 7200, using %d\n", WATCHDOG_HEARTBEAT); } if (pcwd_private.supports_temp) { ret = misc_register(&temp_miscdev); if (ret) { pr_err("cannot register miscdev on minor=%d (err=%d)\n", TEMP_MINOR, ret); goto error_misc_register_temp; } } ret = misc_register(&pcwd_miscdev); if (ret) { pr_err("cannot register miscdev on minor=%d (err=%d)\n", WATCHDOG_MINOR, ret); goto error_misc_register_watchdog; } pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n", heartbeat, nowayout); return 0; error_misc_register_watchdog: if (pcwd_private.supports_temp) misc_deregister(&temp_miscdev); error_misc_register_temp: release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); error_request_region: pcwd_private.io_addr = 0x0000; cards_found--; return ret; } static int pcwd_isa_remove(struct device *dev, unsigned int id) { if (debug >= DEBUG) pr_debug("pcwd_isa_remove id=%d\n", id); if (!pcwd_private.io_addr) return 1; /* Disable the board */ if (!nowayout) pcwd_stop(); /* Deregister */ misc_deregister(&pcwd_miscdev); if (pcwd_private.supports_temp) misc_deregister(&temp_miscdev); release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); pcwd_private.io_addr = 0x0000; cards_found--; return 0; } static void pcwd_isa_shutdown(struct device *dev, unsigned int id) { if (debug >= DEBUG) pr_debug("pcwd_isa_shutdown id=%d\n", id); pcwd_stop(); } static struct isa_driver pcwd_isa_driver = { .match = pcwd_isa_match, .probe = pcwd_isa_probe, .remove = pcwd_isa_remove, .shutdown = pcwd_isa_shutdown, .driver = { .owner = THIS_MODULE, .name = WATCHDOG_NAME, }, }; static int __init pcwd_init_module(void) { return isa_register_driver(&pcwd_isa_driver, PCWD_ISA_NR_CARDS); } static void __exit pcwd_cleanup_module(void) { isa_unregister_driver(&pcwd_isa_driver); pr_info("Watchdog Module Unloaded\n"); } module_init(pcwd_init_module); module_exit(pcwd_cleanup_module); MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>, " "Wim Van Sebroeck <wim@iguana.be>"); MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver"); MODULE_VERSION(WATCHDOG_VERSION); MODULE_LICENSE("GPL");