999 lines
26 KiB
C
999 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* PC Watchdog Driver
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* by Ken Hollis (khollis@bitgate.com)
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*
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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
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*
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* 960107 Added request_region routines, modulized the whole thing.
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* 960108 Fixed end-of-file pointer (Thanks to Dan Hollis), added
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* WD_TIMEOUT define.
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* 960216 Added eof marker on the file, and changed verbose messages.
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* 960716 Made functional and cosmetic changes to the source for
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* inclusion in Linux 2.0.x kernels, thanks to Alan Cox.
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* 960717 Removed read/seek routines, replaced with ioctl. Also, added
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* check_region command due to Alan's suggestion.
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* 960821 Made changes to compile in newer 2.0.x kernels. Added
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* "cold reboot sense" entry.
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* 960825 Made a few changes to code, deleted some defines and made
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* typedefs to replace them. Made heartbeat reset only available
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* via ioctl, and removed the write routine.
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* 960828 Added new items for PC Watchdog Rev.C card.
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* 960829 Changed around all of the IOCTLs, added new features,
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* added watchdog disable/re-enable routines. Added firmware
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* version reporting. Added read routine for temperature.
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* Removed some extra defines, added an autodetect Revision
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* routine.
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* 961006 Revised some documentation, fixed some cosmetic bugs. Made
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* 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
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* 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.
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* 971222 Changed open/close for temperature handling
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* Michael Meskes <meskes@debian.org>.
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* 980112 Used minor numbers from include/linux/miscdevice.h
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* 990403 Clear reset status after reading control status register in
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* pcwd_showprevstate(). [Marc Boucher <marc@mbsi.ca>]
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* 990605 Made changes to code to support Firmware 1.22a, added
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* fairly useless proc entry.
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* 990610 removed said useless proc code for the merge <alan>
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* 000403 Removed last traces of proc code. <davej>
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* 011214 Added nowayout module option to override
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* CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com>
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* Added timeout module option to override default
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*/
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/*
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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
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* http://www.pcwatchdog.com/
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h> /* For module specific items */
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#include <linux/moduleparam.h> /* For new moduleparam's */
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#include <linux/types.h> /* For standard types (like size_t) */
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#include <linux/errno.h> /* For the -ENODEV/... values */
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#include <linux/kernel.h> /* For printk/panic/... */
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#include <linux/delay.h> /* For mdelay function */
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#include <linux/timer.h> /* For timer related operations */
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#include <linux/jiffies.h> /* For jiffies stuff */
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#include <linux/miscdevice.h> /* For struct miscdevice */
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#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/... */
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#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 */
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#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
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#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
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#include <linux/io.h> /* For inb/outb/... */
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/* Module and version information */
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#define WATCHDOG_VERSION "1.20"
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#define WATCHDOG_DATE "18 Feb 2007"
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#define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog"
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#define WATCHDOG_NAME "pcwd"
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#define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION "\n"
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/*
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* It should be noted that PCWD_REVISION_B was removed because A and B
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* are essentially the same types of card, with the exception that B
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* has temperature reporting. Since I didn't receive a Rev.B card,
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* the Rev.B card is not supported. (It's a good thing too, as they
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* are no longer in production.)
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*/
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#define PCWD_REVISION_A 1
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#define PCWD_REVISION_C 2
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/*
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* These are the auto-probe addresses available.
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*
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* Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350.
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* Revision A has an address range of 2 addresses, while Revision C has 4.
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*/
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#define PCWD_ISA_NR_CARDS 3
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static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 };
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/*
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* These are the defines that describe the control status bits for the
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* PCI-PC Watchdog card.
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*/
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/* Port 1 : Control Status #1 for the PC Watchdog card, revision A. */
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#define WD_WDRST 0x01 /* Previously reset state */
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#define WD_T110 0x02 /* Temperature overheat sense */
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#define WD_HRTBT 0x04 /* Heartbeat sense */
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#define WD_RLY2 0x08 /* External relay triggered */
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#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 */
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#define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */
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#define WD_REVC_TTRP 0x04 /* Temperature Trip status */
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#define WD_REVC_RL2A 0x08 /* Relay 2 activated by
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on-board processor */
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#define WD_REVC_RL1A 0x10 /* Relay 1 active */
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#define WD_REVC_R2DS 0x40 /* Relay 2 disable */
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#define WD_REVC_RLY2 0x80 /* Relay 2 activated? */
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/* Port 2 : Control Status #2 */
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#define WD_WDIS 0x10 /* Watchdog Disabled */
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#define WD_ENTP 0x20 /* Watchdog Enable Temperature Trip */
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#define WD_SSEL 0x40 /* Watchdog Switch Select
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(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 */
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/* 500ms for each 4 bit response (according to spec.) */
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#define ISA_COMMAND_TIMEOUT 1000
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/* Watchdog's internal commands */
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#define CMD_ISA_IDLE 0x00
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#define CMD_ISA_VERSION_INTEGER 0x01
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#define CMD_ISA_VERSION_TENTH 0x02
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#define CMD_ISA_VERSION_HUNDRETH 0x03
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#define CMD_ISA_VERSION_MINOR 0x04
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#define CMD_ISA_SWITCH_SETTINGS 0x05
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#define CMD_ISA_RESET_PC 0x06
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#define CMD_ISA_ARM_0 0x07
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#define CMD_ISA_ARM_30 0x08
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#define CMD_ISA_ARM_60 0x09
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#define CMD_ISA_DELAY_TIME_2SECS 0x0A
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#define CMD_ISA_DELAY_TIME_4SECS 0x0B
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#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 */
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40, /* OFF-OFF-ON = 40 Sec */
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60, /* OFF-ON-OFF = 1 Min */
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300, /* OFF-ON-ON = 5 Min */
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600, /* ON-OFF-OFF = 10 Min */
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1800, /* ON-OFF-ON = 30 Min */
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3600, /* ON-ON-OFF = 1 Hour */
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7200, /* ON-ON-ON = 2 hour */
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};
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/*
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* We are using an kernel timer to do the pinging of the watchdog
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* every ~500ms. We try to set the internal heartbeat of the
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* watchdog to 2 ms.
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*/
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#define WDT_INTERVAL (HZ/2+1)
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/* We can only use 1 card due to the /dev/watchdog restriction */
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static int cards_found;
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/* 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 */
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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
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a temperature device */
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int command_mode; /* Whether or not the card is in
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command mode */
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int boot_status; /* The card's boot status */
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int io_addr; /* The cards I/O address */
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spinlock_t io_lock; /* the lock for io operations */
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struct timer_list timer; /* The timer that pings the watchdog */
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unsigned long next_heartbeat; /* the next_heartbeat for the timer */
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} pcwd_private;
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/* module parameters */
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#define QUIET 0 /* Default */
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#define VERBOSE 1 /* Verbose */
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#define DEBUG 2 /* print fancy stuff too */
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static int debug = QUIET;
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module_param(debug, int, 0);
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MODULE_PARM_DESC(debug,
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"Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
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/* default heartbeat = delay-time from dip-switches */
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#define WATCHDOG_HEARTBEAT 0
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static int heartbeat = WATCHDOG_HEARTBEAT;
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module_param(heartbeat, int, 0);
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MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
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"(2 <= heartbeat <= 7200 or 0=delay-time from dip-switches, default="
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__MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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/*
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* Internal functions
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*/
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static int send_isa_command(int cmd)
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{
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int i;
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int control_status;
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int port0, last_port0; /* Double read for stabilising */
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if (debug >= DEBUG)
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pr_debug("sending following data cmd=0x%02x\n", 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) {
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last_port0 = port0;
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port0 = inb_p(pcwd_private.io_addr);
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if (port0 == last_port0)
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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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pr_debug("received following data for cmd=0x%02x: port0=0x%02x last_port0=0x%02x\n",
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cmd, port0, last_port0);
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return port0;
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}
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static int set_command_mode(void)
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{
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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)) {
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i = send_isa_command(CMD_ISA_IDLE);
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if (i == 0x00)
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found = 1;
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else if (i == 0xF3) {
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/* 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);
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}
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count++;
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}
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spin_unlock(&pcwd_private.io_lock);
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pcwd_private.command_mode = found;
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if (debug >= DEBUG)
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pr_debug("command_mode=%d\n", pcwd_private.command_mode);
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return found;
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}
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static void unset_command_mode(void)
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{
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/* Set the card into normal mode */
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spin_lock(&pcwd_private.io_lock);
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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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pcwd_private.command_mode = 0;
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if (debug >= DEBUG)
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pr_debug("command_mode=%d\n", pcwd_private.command_mode);
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}
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static inline void pcwd_check_temperature_support(void)
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{
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if (inb(pcwd_private.io_addr) != 0xF0)
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pcwd_private.supports_temp = 1;
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}
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static inline void pcwd_get_firmware(void)
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{
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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()) {
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one = send_isa_command(CMD_ISA_VERSION_INTEGER);
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ten = send_isa_command(CMD_ISA_VERSION_TENTH);
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hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH);
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minor = send_isa_command(CMD_ISA_VERSION_MINOR);
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sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c",
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one, ten, hund, minor);
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}
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unset_command_mode();
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return;
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}
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static inline int pcwd_get_option_switches(void)
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{
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int option_switches = 0;
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if (set_command_mode()) {
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/* Get switch settings */
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option_switches = send_isa_command(CMD_ISA_SWITCH_SETTINGS);
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}
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unset_command_mode();
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return option_switches;
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}
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static void pcwd_show_card_info(void)
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{
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int option_switches;
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/* Get some extra info from the hardware (in command/debug/diag mode) */
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if (pcwd_private.revision == PCWD_REVISION_A)
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pr_info("ISA-PC Watchdog (REV.A) detected at port 0x%04x\n",
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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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pr_info("ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n",
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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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pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
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option_switches,
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((option_switches & 0x10) ? "ON" : "OFF"),
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((option_switches & 0x08) ? "ON" : "OFF"));
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/* Reprogram internal heartbeat to 2 seconds */
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if (set_command_mode()) {
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send_isa_command(CMD_ISA_DELAY_TIME_2SECS);
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unset_command_mode();
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}
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}
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if (pcwd_private.supports_temp)
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pr_info("Temperature Option Detected\n");
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if (pcwd_private.boot_status & WDIOF_CARDRESET)
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pr_info("Previous reboot was caused by the card\n");
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if (pcwd_private.boot_status & WDIOF_OVERHEAT) {
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pr_emerg("Card senses a CPU Overheat. Panicking!\n");
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pr_emerg("CPU Overheat\n");
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}
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if (pcwd_private.boot_status == 0)
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pr_info("No previous trip detected - Cold boot or reset\n");
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}
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static void pcwd_timer_ping(struct timer_list *unused)
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{
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int wdrst_stat;
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/* If we got a heartbeat pulse within the WDT_INTERVAL
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* 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);
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if (pcwd_private.revision == PCWD_REVISION_A) {
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/* Rev A cards are reset by setting the
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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;
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wdrst_stat |= WD_WDRST;
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outb_p(wdrst_stat, pcwd_private.io_addr + 1);
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} else {
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/* Re-trigger watchdog by writing to port 0 */
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outb_p(0x00, pcwd_private.io_addr);
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}
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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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spin_unlock(&pcwd_private.io_lock);
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} else {
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pr_warn("Heartbeat lost! Will not ping the watchdog\n");
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}
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}
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static int pcwd_start(void)
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{
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int stat_reg;
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pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ);
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/* Start the timer */
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mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL);
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/* Enable the port */
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if (pcwd_private.revision == PCWD_REVISION_C) {
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spin_lock(&pcwd_private.io_lock);
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outb_p(0x00, pcwd_private.io_addr + 3);
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udelay(ISA_COMMAND_TIMEOUT);
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stat_reg = inb_p(pcwd_private.io_addr + 2);
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spin_unlock(&pcwd_private.io_lock);
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if (stat_reg & WD_WDIS) {
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pr_info("Could not start watchdog\n");
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return -EIO;
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}
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}
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if (debug >= VERBOSE)
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pr_debug("Watchdog started\n");
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return 0;
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}
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static int pcwd_stop(void)
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{
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int stat_reg;
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/* Stop the timer */
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del_timer(&pcwd_private.timer);
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/* Disable the board */
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if (pcwd_private.revision == PCWD_REVISION_C) {
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spin_lock(&pcwd_private.io_lock);
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outb_p(0xA5, pcwd_private.io_addr + 3);
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udelay(ISA_COMMAND_TIMEOUT);
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outb_p(0xA5, pcwd_private.io_addr + 3);
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udelay(ISA_COMMAND_TIMEOUT);
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stat_reg = inb_p(pcwd_private.io_addr + 2);
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spin_unlock(&pcwd_private.io_lock);
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if ((stat_reg & WD_WDIS) == 0) {
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pr_info("Could not stop watchdog\n");
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return -EIO;
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}
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}
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if (debug >= VERBOSE)
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pr_debug("Watchdog stopped\n");
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return 0;
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}
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static int pcwd_keepalive(void)
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{
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/* user land ping */
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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();
|
|
fallthrough;
|
|
|
|
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 stream_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 stream_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,
|
|
.compat_ioctl = compat_ptr_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();
|
|
|
|
timer_setup(&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 void pcwd_isa_remove(struct device *dev, unsigned int id)
|
|
{
|
|
if (debug >= DEBUG)
|
|
pr_debug("pcwd_isa_remove id=%d\n", id);
|
|
|
|
/* 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--;
|
|
}
|
|
|
|
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,
|
|
},
|
|
};
|
|
|
|
module_isa_driver(pcwd_isa_driver, PCWD_ISA_NR_CARDS);
|
|
|
|
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");
|