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drivers/watchdog/pcwd.c
26.9 KB
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/* * PC Watchdog Driver * by Ken Hollis (khollis@bitgate.com) * |
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* Permission granted from Simon Machell (smachell@berkprod.com) |
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* 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. |
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* 961006 Revised some documentation, fixed some cosmetic bugs. Made * drivers to panic the system if it's overheating at bootup. |
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* 961118 Changed some verbiage on some of the output, tidied up * code bits, and added compatibility to 2.1.x. |
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* 970912 Enabled board on open and disable on close. |
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* 971107 Took account of recent VFS changes (broke read). |
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* 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>] |
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* 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> |
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* 011214 Added nowayout module option to override * CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com> |
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* Added timeout module option to override default |
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*/ /* * A bells and whistles driver is available from http://www.pcwd.de/ |
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* More info available at http://www.berkprod.com/ or * http://www.pcwatchdog.com/ |
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*/ |
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#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 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */ #include <linux/watchdog.h> /* For the watchdog specific items */ |
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#include <linux/reboot.h> /* For kernel_power_off() */ |
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#include <linux/init.h> /* For __init/__exit/... */ #include <linux/fs.h> /* For file operations */ |
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#include <linux/isa.h> /* For isa devices */ |
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#include <linux/ioport.h> /* For io-port access */ #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ |
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#include <linux/uaccess.h> /* For copy_to_user/put_user/... */ #include <linux/io.h> /* For inb/outb/... */ |
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/* Module and version information */ |
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#define WATCHDOG_VERSION "1.20" #define WATCHDOG_DATE "18 Feb 2007" |
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#define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog" #define WATCHDOG_NAME "pcwd" #define PFX WATCHDOG_NAME ": " |
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#define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " " |
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/* * 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 /* |
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* 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 }; /* |
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* 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. */ |
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#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 */ |
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/* Port 1 : Control Status #1 for the PC Watchdog card, revision C. */ |
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#define WD_REVC_WTRP 0x01 /* Watchdog Trip status */ #define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */ #define WD_REVC_TTRP 0x04 /* Temperature Trip status */ |
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#define WD_REVC_RL2A 0x08 /* Relay 2 activated by on-board processor */ |
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#define WD_REVC_RL1A 0x10 /* Relay 1 active */ #define WD_REVC_R2DS 0x40 /* Relay 2 disable */ #define WD_REVC_RLY2 0x80 /* Relay 2 activated? */ |
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/* Port 2 : Control Status #2 */ #define WD_WDIS 0x10 /* Watchdog Disabled */ #define WD_ENTP 0x20 /* Watchdog Enable Temperature Trip */ |
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#define WD_SSEL 0x40 /* Watchdog Switch Select (1:SW1 <-> 0:SW2) */ |
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#define WD_WCMD 0x80 /* Watchdog Command Mode */ |
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/* 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 */ |
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#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 |
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#define CMD_ISA_RESET_PC 0x06 #define CMD_ISA_ARM_0 0x07 #define CMD_ISA_ARM_30 0x08 #define CMD_ISA_ARM_60 0x09 |
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#define CMD_ISA_DELAY_TIME_2SECS 0x0A #define CMD_ISA_DELAY_TIME_4SECS 0x0B #define CMD_ISA_DELAY_TIME_8SECS 0x0C |
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#define CMD_ISA_RESET_RELAYS 0x0D |
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/* Watchdog's Dip Switch heartbeat values */ |
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static const int heartbeat_tbl[] = { |
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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 */ }; |
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/* * 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 */ |
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static unsigned long open_allowed; |
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static char expect_close; |
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static int temp_panic; |
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/* this is private data for each ISA-PC watchdog card */ static struct { |
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char fw_ver_str[6]; /* The cards firmware version */ |
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int revision; /* The card's revision */ |
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int supports_temp; /* Whether or not the card has a temperature device */ int command_mode; /* Whether or not the card is in command mode */ |
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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; |
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/* module parameters */ |
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#define QUIET 0 /* Default */ #define VERBOSE 1 /* Verbose */ #define DEBUG 2 /* print fancy stuff too */ static int debug = QUIET; module_param(debug, int, 0); |
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MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)"); |
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|
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/* default heartbeat = delay-time from dip-switches */ #define WATCHDOG_HEARTBEAT 0 |
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static int heartbeat = WATCHDOG_HEARTBEAT; module_param(heartbeat, int, 0); |
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MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. " "(2 <= heartbeat <= 7200 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); |
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|
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static int nowayout = WATCHDOG_NOWAYOUT; |
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module_param(nowayout, int, 0); |
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
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/* * Internal functions */ static int send_isa_command(int cmd) { int i; int control_status; int port0, last_port0; /* Double read for stabilising */ |
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if (debug >= DEBUG) printk(KERN_DEBUG PFX "sending following data cmd=0x%02x ", cmd); |
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/* The WCMD bit must be 1 and the command is only 4 bits in size */ |
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control_status = (cmd & 0x0F) | WD_WCMD; |
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outb_p(control_status, pcwd_private.io_addr + 2); |
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udelay(ISA_COMMAND_TIMEOUT); |
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port0 = inb_p(pcwd_private.io_addr); |
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for (i = 0; i < 25; ++i) { last_port0 = port0; |
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port0 = inb_p(pcwd_private.io_addr); |
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if (port0 == last_port0) break; /* Data is stable */ |
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udelay(250); |
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} |
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if (debug >= DEBUG) |
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printk(KERN_DEBUG PFX "received following data for " "cmd=0x%02x: port0=0x%02x last_port0=0x%02x ", |
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cmd, port0, last_port0); |
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return port0; } static int set_command_mode(void) { |
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int i, found = 0, count = 0; |
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/* Set the card into command mode */ |
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spin_lock(&pcwd_private.io_lock); |
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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 */ |
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outb_p(0x00, pcwd_private.io_addr + 2); |
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udelay(1200); /* Spec says wait 1ms */ |
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outb_p(0x00, pcwd_private.io_addr + 2); |
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udelay(ISA_COMMAND_TIMEOUT); } count++; } |
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spin_unlock(&pcwd_private.io_lock); pcwd_private.command_mode = found; |
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|
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if (debug >= DEBUG) printk(KERN_DEBUG PFX "command_mode=%d ", pcwd_private.command_mode); |
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return found; |
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} static void unset_command_mode(void) { /* Set the card into normal mode */ |
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spin_lock(&pcwd_private.io_lock); outb_p(0x00, pcwd_private.io_addr + 2); |
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udelay(ISA_COMMAND_TIMEOUT); |
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spin_unlock(&pcwd_private.io_lock); |
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|
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pcwd_private.command_mode = 0; |
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if (debug >= DEBUG) printk(KERN_DEBUG PFX "command_mode=%d ", pcwd_private.command_mode); |
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} |
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static inline void pcwd_check_temperature_support(void) { if (inb(pcwd_private.io_addr) != 0xF0) pcwd_private.supports_temp = 1; } |
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static inline void pcwd_get_firmware(void) |
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{ int one, ten, hund, minor; |
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strcpy(pcwd_private.fw_ver_str, "ERROR"); |
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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); |
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sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c", one, ten, hund, minor); |
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} |
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unset_command_mode(); |
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return; |
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} static inline int pcwd_get_option_switches(void) { |
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int option_switches = 0; |
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if (set_command_mode()) { /* Get switch settings */ option_switches = send_isa_command(CMD_ISA_SWITCH_SETTINGS); } unset_command_mode(); |
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return option_switches; |
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} static void pcwd_show_card_info(void) { |
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int option_switches; /* Get some extra info from the hardware (in command/debug/diag mode) */ if (pcwd_private.revision == PCWD_REVISION_A) |
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printk(KERN_INFO PFX "ISA-PC Watchdog (REV.A) detected at port 0x%04x ", pcwd_private.io_addr); |
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else if (pcwd_private.revision == PCWD_REVISION_C) { |
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pcwd_get_firmware(); |
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printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port " "0x%04x (Firmware version: %s) ", |
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pcwd_private.io_addr, pcwd_private.fw_ver_str); |
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option_switches = pcwd_get_option_switches(); |
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printk(KERN_INFO PFX "Option switches (0x%02x): " "Temperature Reset Enable=%s, Power On Delay=%s ", |
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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) printk(KERN_INFO PFX "Temperature Option Detected "); if (pcwd_private.boot_status & WDIOF_CARDRESET) |
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printk(KERN_INFO PFX "Previous reboot was caused by the card "); |
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if (pcwd_private.boot_status & WDIOF_OVERHEAT) { |
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printk(KERN_EMERG PFX "Card senses a CPU Overheat. Panicking! "); printk(KERN_EMERG PFX "CPU Overheat "); |
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} if (pcwd_private.boot_status == 0) |
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printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset "); |
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} |
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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 */ |
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if (time_before(jiffies, pcwd_private.next_heartbeat)) { |
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/* Ping the watchdog */ |
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spin_lock(&pcwd_private.io_lock); if (pcwd_private.revision == PCWD_REVISION_A) { |
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/* Rev A cards are reset by setting the WD_WDRST bit in register 1 */ |
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wdrst_stat = inb_p(pcwd_private.io_addr); |
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wdrst_stat &= 0x0F; wdrst_stat |= WD_WDRST; |
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outb_p(wdrst_stat, pcwd_private.io_addr + 1); |
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} else { /* Re-trigger watchdog by writing to port 0 */ |
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outb_p(0x00, pcwd_private.io_addr); |
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} /* Re-set the timer interval */ |
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mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
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405 |
spin_unlock(&pcwd_private.io_lock); |
1da177e4c Linux-2.6.12-rc2 |
406 |
} else { |
261dcc70a [WATCHDOG 32/57] ... |
407 408 409 |
printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog "); |
1da177e4c Linux-2.6.12-rc2 |
410 411 412 413 414 415 |
} } static int pcwd_start(void) { int stat_reg; |
a2be87860 [WATCHDOG] pcwd.c... |
416 |
pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
1da177e4c Linux-2.6.12-rc2 |
417 418 |
/* Start the timer */ |
a2be87860 [WATCHDOG] pcwd.c... |
419 |
mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); |
1da177e4c Linux-2.6.12-rc2 |
420 421 |
/* Enable the port */ |
a2be87860 [WATCHDOG] pcwd.c... |
422 423 424 |
if (pcwd_private.revision == PCWD_REVISION_C) { spin_lock(&pcwd_private.io_lock); outb_p(0x00, pcwd_private.io_addr + 3); |
1da177e4c Linux-2.6.12-rc2 |
425 |
udelay(ISA_COMMAND_TIMEOUT); |
a2be87860 [WATCHDOG] pcwd.c... |
426 427 |
stat_reg = inb_p(pcwd_private.io_addr + 2); spin_unlock(&pcwd_private.io_lock); |
8f0235dcc [WATCHDOG] pcwd.c... |
428 |
if (stat_reg & WD_WDIS) { |
1da177e4c Linux-2.6.12-rc2 |
429 430 431 432 433 |
printk(KERN_INFO PFX "Could not start watchdog "); return -EIO; } } |
c324ab428 [WATCHDOG] pcwd.c... |
434 435 436 437 |
if (debug >= VERBOSE) printk(KERN_DEBUG PFX "Watchdog started "); |
1da177e4c Linux-2.6.12-rc2 |
438 439 440 441 442 443 444 445 |
return 0; } static int pcwd_stop(void) { int stat_reg; /* Stop the timer */ |
a2be87860 [WATCHDOG] pcwd.c... |
446 |
del_timer(&pcwd_private.timer); |
1da177e4c Linux-2.6.12-rc2 |
447 448 |
/* Disable the board */ |
a2be87860 [WATCHDOG] pcwd.c... |
449 450 451 |
if (pcwd_private.revision == PCWD_REVISION_C) { spin_lock(&pcwd_private.io_lock); outb_p(0xA5, pcwd_private.io_addr + 3); |
1da177e4c Linux-2.6.12-rc2 |
452 |
udelay(ISA_COMMAND_TIMEOUT); |
a2be87860 [WATCHDOG] pcwd.c... |
453 |
outb_p(0xA5, pcwd_private.io_addr + 3); |
1da177e4c Linux-2.6.12-rc2 |
454 |
udelay(ISA_COMMAND_TIMEOUT); |
a2be87860 [WATCHDOG] pcwd.c... |
455 456 |
stat_reg = inb_p(pcwd_private.io_addr + 2); spin_unlock(&pcwd_private.io_lock); |
8f0235dcc [WATCHDOG] pcwd.c... |
457 |
if ((stat_reg & WD_WDIS) == 0) { |
1da177e4c Linux-2.6.12-rc2 |
458 459 460 461 462 |
printk(KERN_INFO PFX "Could not stop watchdog "); return -EIO; } } |
c324ab428 [WATCHDOG] pcwd.c... |
463 464 465 466 |
if (debug >= VERBOSE) printk(KERN_DEBUG PFX "Watchdog stopped "); |
1da177e4c Linux-2.6.12-rc2 |
467 468 469 470 471 472 |
return 0; } static int pcwd_keepalive(void) { /* user land ping */ |
a2be87860 [WATCHDOG] pcwd.c... |
473 |
pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); |
c324ab428 [WATCHDOG] pcwd.c... |
474 475 476 477 |
if (debug >= DEBUG) printk(KERN_DEBUG PFX "Watchdog keepalive signal send "); |
1da177e4c Linux-2.6.12-rc2 |
478 479 480 481 482 |
return 0; } static int pcwd_set_heartbeat(int t) { |
261dcc70a [WATCHDOG 32/57] ... |
483 |
if (t < 2 || t > 7200) /* arbitrary upper limit */ |
1da177e4c Linux-2.6.12-rc2 |
484 485 486 |
return -EINVAL; heartbeat = t; |
c324ab428 [WATCHDOG] pcwd.c... |
487 488 489 490 491 |
if (debug >= VERBOSE) printk(KERN_DEBUG PFX "New heartbeat: %d ", heartbeat); |
1da177e4c Linux-2.6.12-rc2 |
492 493 494 495 496 |
return 0; } static int pcwd_get_status(int *status) { |
4206f0c4d [WATCHDOG] pcwd.c... |
497 |
int control_status; |
1da177e4c Linux-2.6.12-rc2 |
498 |
|
261dcc70a [WATCHDOG 32/57] ... |
499 |
*status = 0; |
a2be87860 [WATCHDOG] pcwd.c... |
500 501 |
spin_lock(&pcwd_private.io_lock); if (pcwd_private.revision == PCWD_REVISION_A) |
1da177e4c Linux-2.6.12-rc2 |
502 503 504 |
/* Rev A cards return status information from * the base register, which is used for the * temperature in other cards. */ |
4206f0c4d [WATCHDOG] pcwd.c... |
505 |
control_status = inb(pcwd_private.io_addr); |
1da177e4c Linux-2.6.12-rc2 |
506 507 508 509 510 511 |
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. */ |
4206f0c4d [WATCHDOG] pcwd.c... |
512 |
control_status = inb(pcwd_private.io_addr + 1); |
1da177e4c Linux-2.6.12-rc2 |
513 |
} |
a2be87860 [WATCHDOG] pcwd.c... |
514 |
spin_unlock(&pcwd_private.io_lock); |
1da177e4c Linux-2.6.12-rc2 |
515 |
|
a2be87860 [WATCHDOG] pcwd.c... |
516 |
if (pcwd_private.revision == PCWD_REVISION_A) { |
4206f0c4d [WATCHDOG] pcwd.c... |
517 |
if (control_status & WD_WDRST) |
1da177e4c Linux-2.6.12-rc2 |
518 |
*status |= WDIOF_CARDRESET; |
4206f0c4d [WATCHDOG] pcwd.c... |
519 |
if (control_status & WD_T110) { |
1da177e4c Linux-2.6.12-rc2 |
520 521 |
*status |= WDIOF_OVERHEAT; if (temp_panic) { |
261dcc70a [WATCHDOG 32/57] ... |
522 523 524 |
printk(KERN_INFO PFX "Temperature overheat trip! "); |
68acc05d0 [PATCH] pcwd.c: C... |
525 |
kernel_power_off(); |
1da177e4c Linux-2.6.12-rc2 |
526 527 528 |
} } } else { |
4206f0c4d [WATCHDOG] pcwd.c... |
529 |
if (control_status & WD_REVC_WTRP) |
1da177e4c Linux-2.6.12-rc2 |
530 |
*status |= WDIOF_CARDRESET; |
4206f0c4d [WATCHDOG] pcwd.c... |
531 |
if (control_status & WD_REVC_TTRP) { |
1da177e4c Linux-2.6.12-rc2 |
532 533 |
*status |= WDIOF_OVERHEAT; if (temp_panic) { |
261dcc70a [WATCHDOG 32/57] ... |
534 535 536 |
printk(KERN_INFO PFX "Temperature overheat trip! "); |
68acc05d0 [PATCH] pcwd.c: C... |
537 |
kernel_power_off(); |
1da177e4c Linux-2.6.12-rc2 |
538 539 540 541 542 543 544 545 546 |
} } } return 0; } static int pcwd_clear_status(void) { |
4206f0c4d [WATCHDOG] pcwd.c... |
547 |
int control_status; |
a2be87860 [WATCHDOG] pcwd.c... |
548 549 |
if (pcwd_private.revision == PCWD_REVISION_C) { spin_lock(&pcwd_private.io_lock); |
4206f0c4d [WATCHDOG] pcwd.c... |
550 |
|
c324ab428 [WATCHDOG] pcwd.c... |
551 |
if (debug >= VERBOSE) |
261dcc70a [WATCHDOG 32/57] ... |
552 553 554 |
printk(KERN_INFO PFX "clearing watchdog trip status "); |
c324ab428 [WATCHDOG] pcwd.c... |
555 |
|
4206f0c4d [WATCHDOG] pcwd.c... |
556 |
control_status = inb_p(pcwd_private.io_addr + 1); |
c324ab428 [WATCHDOG] pcwd.c... |
557 |
if (debug >= DEBUG) { |
261dcc70a [WATCHDOG 32/57] ... |
558 559 560 |
printk(KERN_DEBUG PFX "status was: 0x%02x ", control_status); |
c324ab428 [WATCHDOG] pcwd.c... |
561 562 563 564 |
printk(KERN_DEBUG PFX "sending: 0x%02x ", (control_status & WD_REVC_R2DS)); } |
4206f0c4d [WATCHDOG] pcwd.c... |
565 |
/* clear reset status & Keep Relay 2 disable state as it is */ |
261dcc70a [WATCHDOG 32/57] ... |
566 567 |
outb_p((control_status & WD_REVC_R2DS), pcwd_private.io_addr + 1); |
4206f0c4d [WATCHDOG] pcwd.c... |
568 |
|
a2be87860 [WATCHDOG] pcwd.c... |
569 |
spin_unlock(&pcwd_private.io_lock); |
1da177e4c Linux-2.6.12-rc2 |
570 571 572 573 574 575 576 |
} return 0; } static int pcwd_get_temperature(int *temperature) { /* check that port 0 gives temperature info and no command results */ |
a2be87860 [WATCHDOG] pcwd.c... |
577 |
if (pcwd_private.command_mode) |
1da177e4c Linux-2.6.12-rc2 |
578 579 580 |
return -1; *temperature = 0; |
a2be87860 [WATCHDOG] pcwd.c... |
581 |
if (!pcwd_private.supports_temp) |
1da177e4c Linux-2.6.12-rc2 |
582 583 584 585 586 587 |
return -ENODEV; /* * Convert celsius to fahrenheit, since this was * the decided 'standard' for this return value. */ |
a2be87860 [WATCHDOG] pcwd.c... |
588 589 590 |
spin_lock(&pcwd_private.io_lock); *temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32; spin_unlock(&pcwd_private.io_lock); |
1da177e4c Linux-2.6.12-rc2 |
591 |
|
c324ab428 [WATCHDOG] pcwd.c... |
592 593 594 595 596 |
if (debug >= DEBUG) { printk(KERN_DEBUG PFX "temperature is: %d F ", *temperature); } |
1da177e4c Linux-2.6.12-rc2 |
597 598 599 600 601 602 |
return 0; } /* * /dev/watchdog handling */ |
261dcc70a [WATCHDOG 32/57] ... |
603 |
static long pcwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
1da177e4c Linux-2.6.12-rc2 |
604 605 606 607 608 609 |
{ int rv; int status; int temperature; int new_heartbeat; int __user *argp = (int __user *)arg; |
42747d712 [WATCHDOG] watchd... |
610 |
static const struct watchdog_info ident = { |
1da177e4c Linux-2.6.12-rc2 |
611 612 613 614 615 616 617 618 |
.options = WDIOF_OVERHEAT | WDIOF_CARDRESET | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, .firmware_version = 1, .identity = "PCWD", }; |
261dcc70a [WATCHDOG 32/57] ... |
619 |
switch (cmd) { |
1da177e4c Linux-2.6.12-rc2 |
620 |
case WDIOC_GETSUPPORT: |
261dcc70a [WATCHDOG 32/57] ... |
621 |
if (copy_to_user(argp, &ident, sizeof(ident))) |
1da177e4c Linux-2.6.12-rc2 |
622 623 624 625 626 627 628 629 |
return -EFAULT; return 0; case WDIOC_GETSTATUS: pcwd_get_status(&status); return put_user(status, argp); case WDIOC_GETBOOTSTATUS: |
a2be87860 [WATCHDOG] pcwd.c... |
630 |
return put_user(pcwd_private.boot_status, argp); |
1da177e4c Linux-2.6.12-rc2 |
631 632 633 634 635 636 637 638 |
case WDIOC_GETTEMP: if (pcwd_get_temperature(&temperature)) return -EFAULT; return put_user(temperature, argp); case WDIOC_SETOPTIONS: |
261dcc70a [WATCHDOG 32/57] ... |
639 640 |
if (pcwd_private.revision == PCWD_REVISION_C) { if (get_user(rv, argp)) |
1da177e4c Linux-2.6.12-rc2 |
641 |
return -EFAULT; |
261dcc70a [WATCHDOG 32/57] ... |
642 643 644 645 |
if (rv & WDIOS_DISABLECARD) { status = pcwd_stop(); if (status < 0) return status; |
1da177e4c Linux-2.6.12-rc2 |
646 |
} |
261dcc70a [WATCHDOG 32/57] ... |
647 648 649 650 |
if (rv & WDIOS_ENABLECARD) { status = pcwd_start(); if (status < 0) return status; |
1da177e4c Linux-2.6.12-rc2 |
651 |
} |
1da177e4c Linux-2.6.12-rc2 |
652 |
if (rv & WDIOS_TEMPPANIC) |
1da177e4c Linux-2.6.12-rc2 |
653 |
temp_panic = 1; |
1da177e4c Linux-2.6.12-rc2 |
654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 |
} 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); |
0c06090c9 [WATCHDOG] Coding... |
673 674 675 |
default: return -ENOTTY; |
1da177e4c Linux-2.6.12-rc2 |
676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 |
} 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) { |
261dcc70a [WATCHDOG 32/57] ... |
707 |
if (test_and_set_bit(0, &open_allowed)) |
1da177e4c Linux-2.6.12-rc2 |
708 |
return -EBUSY; |
1da177e4c Linux-2.6.12-rc2 |
709 710 |
if (nowayout) __module_get(THIS_MODULE); |
1da177e4c Linux-2.6.12-rc2 |
711 712 713 714 715 716 717 718 |
/* Activate */ pcwd_start(); pcwd_keepalive(); return nonseekable_open(inode, file); } static int pcwd_close(struct inode *inode, struct file *file) { |
261dcc70a [WATCHDOG 32/57] ... |
719 |
if (expect_close == 42) |
1da177e4c Linux-2.6.12-rc2 |
720 |
pcwd_stop(); |
261dcc70a [WATCHDOG 32/57] ... |
721 722 723 724 |
else { printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog! "); |
1da177e4c Linux-2.6.12-rc2 |
725 726 727 |
pcwd_keepalive(); } expect_close = 0; |
261dcc70a [WATCHDOG 32/57] ... |
728 |
clear_bit(0, &open_allowed); |
1da177e4c Linux-2.6.12-rc2 |
729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 |
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) { |
a2be87860 [WATCHDOG] pcwd.c... |
752 |
if (!pcwd_private.supports_temp) |
1da177e4c Linux-2.6.12-rc2 |
753 754 755 756 757 758 759 760 761 762 763 |
return -ENODEV; return nonseekable_open(inode, file); } static int pcwd_temp_close(struct inode *inode, struct file *file) { return 0; } /* |
1da177e4c Linux-2.6.12-rc2 |
764 765 |
* Kernel Interfaces */ |
62322d255 [PATCH] make more... |
766 |
static const struct file_operations pcwd_fops = { |
1da177e4c Linux-2.6.12-rc2 |
767 768 769 |
.owner = THIS_MODULE, .llseek = no_llseek, .write = pcwd_write, |
261dcc70a [WATCHDOG 32/57] ... |
770 |
.unlocked_ioctl = pcwd_ioctl, |
1da177e4c Linux-2.6.12-rc2 |
771 772 773 774 775 776 777 778 779 |
.open = pcwd_open, .release = pcwd_close, }; static struct miscdevice pcwd_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &pcwd_fops, }; |
62322d255 [PATCH] make more... |
780 |
static const struct file_operations pcwd_temp_fops = { |
1da177e4c Linux-2.6.12-rc2 |
781 782 783 784 785 786 787 788 789 790 791 792 |
.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, }; |
1da177e4c Linux-2.6.12-rc2 |
793 794 795 |
/* * Init & exit routines */ |
1da177e4c Linux-2.6.12-rc2 |
796 797 798 |
static inline int get_revision(void) { int r = PCWD_REVISION_C; |
a2be87860 [WATCHDOG] pcwd.c... |
799 |
spin_lock(&pcwd_private.io_lock); |
1da177e4c Linux-2.6.12-rc2 |
800 801 |
/* REV A cards use only 2 io ports; test * presumes a floating bus reads as 0xff. */ |
a2be87860 [WATCHDOG] pcwd.c... |
802 803 |
if ((inb(pcwd_private.io_addr + 2) == 0xFF) || (inb(pcwd_private.io_addr + 3) == 0xFF)) |
261dcc70a [WATCHDOG 32/57] ... |
804 |
r = PCWD_REVISION_A; |
a2be87860 [WATCHDOG] pcwd.c... |
805 |
spin_unlock(&pcwd_private.io_lock); |
1da177e4c Linux-2.6.12-rc2 |
806 807 808 |
return r; } |
5aa15050a [WATCHDOG] pcwd.c... |
809 810 811 812 813 814 815 816 817 |
/* * 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 __devinit pcwd_isa_match(struct device *dev, unsigned int id) { |
261dcc70a [WATCHDOG 32/57] ... |
818 |
int base_addr = pcwd_ioports[id]; |
5aa15050a [WATCHDOG] pcwd.c... |
819 820 821 822 823 824 825 826 827 |
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) printk(KERN_DEBUG PFX "pcwd_isa_match id=%d ", id); |
261dcc70a [WATCHDOG 32/57] ... |
828 |
if (!request_region(base_addr, 4, "PCWD")) { |
5aa15050a [WATCHDOG] pcwd.c... |
829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 |
printk(KERN_INFO PFX "Port 0x%04x unavailable ", 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; } } } |
261dcc70a [WATCHDOG 32/57] ... |
858 |
release_region(base_addr, 4); |
5aa15050a [WATCHDOG] pcwd.c... |
859 860 861 862 863 |
return retval; } static int __devinit pcwd_isa_probe(struct device *dev, unsigned int id) |
1da177e4c Linux-2.6.12-rc2 |
864 865 |
{ int ret; |
1da177e4c Linux-2.6.12-rc2 |
866 |
|
5aa15050a [WATCHDOG] pcwd.c... |
867 868 869 870 |
if (debug >= DEBUG) printk(KERN_DEBUG PFX "pcwd_isa_probe id=%d ", id); |
1da177e4c Linux-2.6.12-rc2 |
871 872 |
cards_found++; if (cards_found == 1) |
261dcc70a [WATCHDOG 32/57] ... |
873 874 |
printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com) ", |
143a2e54b [WATCHDOG] More c... |
875 |
WATCHDOG_VERSION); |
1da177e4c Linux-2.6.12-rc2 |
876 877 878 879 880 881 |
if (cards_found > 1) { printk(KERN_ERR PFX "This driver only supports 1 device "); return -ENODEV; } |
5aa15050a [WATCHDOG] pcwd.c... |
882 |
if (pcwd_ioports[id] == 0x0000) { |
1da177e4c Linux-2.6.12-rc2 |
883 884 885 886 |
printk(KERN_ERR PFX "No I/O-Address for card detected "); return -ENODEV; } |
5aa15050a [WATCHDOG] pcwd.c... |
887 888 889 |
pcwd_private.io_addr = pcwd_ioports[id]; spin_lock_init(&pcwd_private.io_lock); |
1da177e4c Linux-2.6.12-rc2 |
890 891 |
/* Check card's revision */ |
a2be87860 [WATCHDOG] pcwd.c... |
892 |
pcwd_private.revision = get_revision(); |
1da177e4c Linux-2.6.12-rc2 |
893 |
|
261dcc70a [WATCHDOG 32/57] ... |
894 895 |
if (!request_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) { |
1da177e4c Linux-2.6.12-rc2 |
896 897 |
printk(KERN_ERR PFX "I/O address 0x%04x already in use ", |
a2be87860 [WATCHDOG] pcwd.c... |
898 |
pcwd_private.io_addr); |
261dcc70a [WATCHDOG 32/57] ... |
899 |
ret = -EIO; |
5aa15050a [WATCHDOG] pcwd.c... |
900 |
goto error_request_region; |
1da177e4c Linux-2.6.12-rc2 |
901 902 903 |
} /* Initial variables */ |
a2be87860 [WATCHDOG] pcwd.c... |
904 |
pcwd_private.supports_temp = 0; |
1da177e4c Linux-2.6.12-rc2 |
905 |
temp_panic = 0; |
a2be87860 [WATCHDOG] pcwd.c... |
906 |
pcwd_private.boot_status = 0x0000; |
1da177e4c Linux-2.6.12-rc2 |
907 908 |
/* get the boot_status */ |
a2be87860 [WATCHDOG] pcwd.c... |
909 |
pcwd_get_status(&pcwd_private.boot_status); |
1da177e4c Linux-2.6.12-rc2 |
910 911 912 |
/* clear the "card caused reboot" flag */ pcwd_clear_status(); |
82eb7c505 [WATCHDOG] timers... |
913 |
setup_timer(&pcwd_private.timer, pcwd_timer_ping, 0); |
1da177e4c Linux-2.6.12-rc2 |
914 915 916 917 918 |
/* Disable the board */ pcwd_stop(); /* Check whether or not the card supports the temperature device */ |
85875211a [WATCHDOG] pcwd.c... |
919 |
pcwd_check_temperature_support(); |
1da177e4c Linux-2.6.12-rc2 |
920 |
|
af3b38d99 [WATCHDOG] pcwd.c... |
921 922 |
/* Show info about the card itself */ pcwd_show_card_info(); |
1da177e4c Linux-2.6.12-rc2 |
923 |
|
f3dc07330 [WATCHDOG] pcwd_u... |
924 925 926 |
/* If heartbeat = 0 then we use the heartbeat from the dip-switches */ if (heartbeat == 0) heartbeat = heartbeat_tbl[(pcwd_get_option_switches() & 0x07)]; |
261dcc70a [WATCHDOG 32/57] ... |
927 928 |
/* Check that the heartbeat value is within it's range; if not reset to the default */ |
fd41fa616 [WATCHDOG] pcwd.c... |
929 930 |
if (pcwd_set_heartbeat(heartbeat)) { pcwd_set_heartbeat(WATCHDOG_HEARTBEAT); |
261dcc70a [WATCHDOG 32/57] ... |
931 932 933 934 |
printk(KERN_INFO PFX "heartbeat value must be 2 <= heartbeat <= 7200, using %d ", WATCHDOG_HEARTBEAT); |
1da177e4c Linux-2.6.12-rc2 |
935 |
} |
a2be87860 [WATCHDOG] pcwd.c... |
936 |
if (pcwd_private.supports_temp) { |
1da177e4c Linux-2.6.12-rc2 |
937 938 |
ret = misc_register(&temp_miscdev); if (ret) { |
261dcc70a [WATCHDOG 32/57] ... |
939 940 941 942 |
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d) ", TEMP_MINOR, ret); |
5aa15050a [WATCHDOG] pcwd.c... |
943 |
goto error_misc_register_temp; |
1da177e4c Linux-2.6.12-rc2 |
944 945 946 947 948 |
} } ret = misc_register(&pcwd_miscdev); if (ret) { |
261dcc70a [WATCHDOG 32/57] ... |
949 950 951 952 |
printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d) ", WATCHDOG_MINOR, ret); |
5aa15050a [WATCHDOG] pcwd.c... |
953 |
goto error_misc_register_watchdog; |
1da177e4c Linux-2.6.12-rc2 |
954 955 956 957 958 959 960 |
} printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d) ", heartbeat, nowayout); return 0; |
5aa15050a [WATCHDOG] pcwd.c... |
961 962 963 964 965 |
error_misc_register_watchdog: if (pcwd_private.supports_temp) misc_deregister(&temp_miscdev); error_misc_register_temp: |
261dcc70a [WATCHDOG 32/57] ... |
966 967 |
release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
5aa15050a [WATCHDOG] pcwd.c... |
968 969 970 971 |
error_request_region: pcwd_private.io_addr = 0x0000; cards_found--; return ret; |
1da177e4c Linux-2.6.12-rc2 |
972 |
} |
5aa15050a [WATCHDOG] pcwd.c... |
973 |
static int __devexit pcwd_isa_remove(struct device *dev, unsigned int id) |
1da177e4c Linux-2.6.12-rc2 |
974 |
{ |
5aa15050a [WATCHDOG] pcwd.c... |
975 976 977 978 979 980 981 |
if (debug >= DEBUG) printk(KERN_DEBUG PFX "pcwd_isa_remove id=%d ", id); if (!pcwd_private.io_addr) return 1; |
1da177e4c Linux-2.6.12-rc2 |
982 983 984 985 986 987 |
/* Disable the board */ if (!nowayout) pcwd_stop(); /* Deregister */ misc_deregister(&pcwd_miscdev); |
a2be87860 [WATCHDOG] pcwd.c... |
988 |
if (pcwd_private.supports_temp) |
1da177e4c Linux-2.6.12-rc2 |
989 |
misc_deregister(&temp_miscdev); |
261dcc70a [WATCHDOG 32/57] ... |
990 991 |
release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); |
a2be87860 [WATCHDOG] pcwd.c... |
992 |
pcwd_private.io_addr = 0x0000; |
f1c3a0567 [WATCHDOG] pcwd.c... |
993 |
cards_found--; |
5aa15050a [WATCHDOG] pcwd.c... |
994 995 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
996 |
} |
5aa15050a [WATCHDOG] pcwd.c... |
997 |
static void pcwd_isa_shutdown(struct device *dev, unsigned int id) |
1da177e4c Linux-2.6.12-rc2 |
998 |
{ |
5aa15050a [WATCHDOG] pcwd.c... |
999 1000 1001 1002 |
if (debug >= DEBUG) printk(KERN_DEBUG PFX "pcwd_isa_shutdown id=%d ", id); |
1da177e4c Linux-2.6.12-rc2 |
1003 |
|
5aa15050a [WATCHDOG] pcwd.c... |
1004 |
pcwd_stop(); |
1da177e4c Linux-2.6.12-rc2 |
1005 |
} |
5aa15050a [WATCHDOG] pcwd.c... |
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 |
static struct isa_driver pcwd_isa_driver = { .match = pcwd_isa_match, .probe = pcwd_isa_probe, .remove = __devexit_p(pcwd_isa_remove), .shutdown = pcwd_isa_shutdown, .driver = { .owner = THIS_MODULE, .name = WATCHDOG_NAME, }, }; |
1da177e4c Linux-2.6.12-rc2 |
1016 1017 1018 |
static int __init pcwd_init_module(void) { |
5aa15050a [WATCHDOG] pcwd.c... |
1019 |
return isa_register_driver(&pcwd_isa_driver, PCWD_ISA_NR_CARDS); |
1da177e4c Linux-2.6.12-rc2 |
1020 1021 1022 1023 |
} static void __exit pcwd_cleanup_module(void) { |
5aa15050a [WATCHDOG] pcwd.c... |
1024 |
isa_unregister_driver(&pcwd_isa_driver); |
369fa2529 [WATCHDOG] pcwd.c... |
1025 1026 |
printk(KERN_INFO PFX "Watchdog Module Unloaded. "); |
1da177e4c Linux-2.6.12-rc2 |
1027 1028 1029 1030 |
} module_init(pcwd_init_module); module_exit(pcwd_cleanup_module); |
143a2e54b [WATCHDOG] More c... |
1031 1032 |
MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>, " "Wim Van Sebroeck <wim@iguana.be>"); |
1da177e4c Linux-2.6.12-rc2 |
1033 |
MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver"); |
5aa15050a [WATCHDOG] pcwd.c... |
1034 |
MODULE_VERSION(WATCHDOG_VERSION); |
1da177e4c Linux-2.6.12-rc2 |
1035 1036 1037 |
MODULE_LICENSE("GPL"); MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); MODULE_ALIAS_MISCDEV(TEMP_MINOR); |