diff options
Diffstat (limited to 'drivers/char/watchdog/pcwd.c')
| -rw-r--r-- | drivers/char/watchdog/pcwd.c | 921 |
1 files changed, 0 insertions, 921 deletions
diff --git a/drivers/char/watchdog/pcwd.c b/drivers/char/watchdog/pcwd.c deleted file mode 100644 index 427ad51b7a3..00000000000 --- a/drivers/char/watchdog/pcwd.c +++ /dev/null @@ -1,921 +0,0 @@ -/* - * PC Watchdog Driver - * by Ken Hollis (khollis@bitgate.com) - * - * Permission granted from Simon Machell (73244.1270@compuserve.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/ - */ - -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/types.h> -#include <linux/timer.h> -#include <linux/jiffies.h> -#include <linux/config.h> -#include <linux/wait.h> -#include <linux/slab.h> -#include <linux/ioport.h> -#include <linux/delay.h> -#include <linux/fs.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/notifier.h> -#include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/reboot.h> - -#include <asm/uaccess.h> -#include <asm/io.h> - -#define WD_VER "1.16 (06/12/2004)" -#define PFX "pcwd: " - -/* - * 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 defines that describe the control status bits 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 */ - -/* - * These are the defines that describe the control status bits 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 */ - -/* 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_DELAY_TIME_2SECS 0x0A -#define CMD_ISA_DELAY_TIME_4SECS 0x0B -#define CMD_ISA_DELAY_TIME_8SECS 0x0C - -/* - * 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 atomic_t open_allowed = ATOMIC_INIT(1); -static char expect_close; -static struct timer_list timer; -static unsigned long next_heartbeat; -static int temp_panic; -static int revision; /* The card's revision */ -static int supports_temp; /* Wether or not the card has a temperature device */ -static int command_mode; /* Wether or not the card is in command mode */ -static int initial_status; /* The card's boot status */ -static int current_readport; /* The cards I/O address */ -static spinlock_t io_lock; - -/* module parameters */ -#define WATCHDOG_HEARTBEAT 60 /* 60 sec default heartbeat */ -static int heartbeat = WATCHDOG_HEARTBEAT; -module_param(heartbeat, int, 0); -MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<=heartbeat<=7200, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); - -static int nowayout = WATCHDOG_NOWAYOUT; -module_param(nowayout, int, 0); -MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); - -/* - * Internal functions - */ - -static int send_isa_command(int cmd) -{ - int i; - int control_status; - int port0, last_port0; /* Double read for stabilising */ - - /* The WCMD bit must be 1 and the command is only 4 bits in size */ - control_status = (cmd & 0x0F) | 0x80; - outb_p(control_status, current_readport + 2); - udelay(ISA_COMMAND_TIMEOUT); - - port0 = inb_p(current_readport); - for (i = 0; i < 25; ++i) { - last_port0 = port0; - port0 = inb_p(current_readport); - - if (port0 == last_port0) - break; /* Data is stable */ - - udelay (250); - } - - return port0; -} - -static int set_command_mode(void) -{ - int i, found=0, count=0; - - /* Set the card into command mode */ - spin_lock(&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, current_readport + 2); - udelay(1200); /* Spec says wait 1ms */ - outb_p(0x00, current_readport + 2); - udelay(ISA_COMMAND_TIMEOUT); - } - count++; - } - spin_unlock(&io_lock); - command_mode = found; - - return(found); -} - -static void unset_command_mode(void) -{ - /* Set the card into normal mode */ - spin_lock(&io_lock); - outb_p(0x00, current_readport + 2); - udelay(ISA_COMMAND_TIMEOUT); - spin_unlock(&io_lock); - - command_mode = 0; -} - -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, next_heartbeat)) { - /* Ping the watchdog */ - spin_lock(&io_lock); - if (revision == PCWD_REVISION_A) { - /* Rev A cards are reset by setting the WD_WDRST bit in register 1 */ - wdrst_stat = inb_p(current_readport); - wdrst_stat &= 0x0F; - wdrst_stat |= WD_WDRST; - - outb_p(wdrst_stat, current_readport + 1); - } else { - /* Re-trigger watchdog by writing to port 0 */ - outb_p(0x00, current_readport); - } - - /* Re-set the timer interval */ - mod_timer(&timer, jiffies + WDT_INTERVAL); - - spin_unlock(&io_lock); - } else { - printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n"); - } -} - -static int pcwd_start(void) -{ - int stat_reg; - - next_heartbeat = jiffies + (heartbeat * HZ); - - /* Start the timer */ - mod_timer(&timer, jiffies + WDT_INTERVAL); - - /* Enable the port */ - if (revision == PCWD_REVISION_C) { - spin_lock(&io_lock); - outb_p(0x00, current_readport + 3); - udelay(ISA_COMMAND_TIMEOUT); - stat_reg = inb_p(current_readport + 2); - spin_unlock(&io_lock); - if (stat_reg & 0x10) { - printk(KERN_INFO PFX "Could not start watchdog\n"); - return -EIO; - } - } - return 0; -} - -static int pcwd_stop(void) -{ - int stat_reg; - - /* Stop the timer */ - del_timer(&timer); - - /* Disable the board */ - if (revision == PCWD_REVISION_C) { - spin_lock(&io_lock); - outb_p(0xA5, current_readport + 3); - udelay(ISA_COMMAND_TIMEOUT); - outb_p(0xA5, current_readport + 3); - udelay(ISA_COMMAND_TIMEOUT); - stat_reg = inb_p(current_readport + 2); - spin_unlock(&io_lock); - if ((stat_reg & 0x10) == 0) { - printk(KERN_INFO PFX "Could not stop watchdog\n"); - return -EIO; - } - } - return 0; -} - -static int pcwd_keepalive(void) -{ - /* user land ping */ - next_heartbeat = jiffies + (heartbeat * HZ); - return 0; -} - -static int pcwd_set_heartbeat(int t) -{ - if ((t < 2) || (t > 7200)) /* arbitrary upper limit */ - return -EINVAL; - - heartbeat = t; - return 0; -} - -static int pcwd_get_status(int *status) -{ - int card_status; - - *status=0; - spin_lock(&io_lock); - if (revision == PCWD_REVISION_A) - /* Rev A cards return status information from - * the base register, which is used for the - * temperature in other cards. */ - card_status = inb(current_readport); - 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. */ - card_status = inb(current_readport + 1); - } - spin_unlock(&io_lock); - - if (revision == PCWD_REVISION_A) { - if (card_status & WD_WDRST) - *status |= WDIOF_CARDRESET; - - if (card_status & WD_T110) { - *status |= WDIOF_OVERHEAT; - if (temp_panic) { - printk (KERN_INFO PFX "Temperature overheat trip!\n"); - kernel_power_off(); - } - } - } else { - if (card_status & WD_REVC_WTRP) - *status |= WDIOF_CARDRESET; - - if (card_status & WD_REVC_TTRP) { - *status |= WDIOF_OVERHEAT; - if (temp_panic) { - printk (KERN_INFO PFX "Temperature overheat trip!\n"); - kernel_power_off(); - } - } - } - - return 0; -} - -static int pcwd_clear_status(void) -{ - if (revision == PCWD_REVISION_C) { - spin_lock(&io_lock); - outb_p(0x00, current_readport + 1); /* clear reset status */ - spin_unlock(&io_lock); - } - return 0; -} - -static int pcwd_get_temperature(int *temperature) -{ - /* check that port 0 gives temperature info and no command results */ - if (command_mode) - return -1; - - *temperature = 0; - if (!supports_temp) - return -ENODEV; - - /* - * Convert celsius to fahrenheit, since this was - * the decided 'standard' for this return value. - */ - spin_lock(&io_lock); - *temperature = ((inb(current_readport)) * 9 / 5) + 32; - spin_unlock(&io_lock); - - return 0; -} - -/* - * /dev/watchdog handling - */ - -static int pcwd_ioctl(struct inode *inode, 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 struct watchdog_info ident = { - .options = WDIOF_OVERHEAT | - WDIOF_CARDRESET | - WDIOF_KEEPALIVEPING | - WDIOF_SETTIMEOUT | - WDIOF_MAGICCLOSE, - .firmware_version = 1, - .identity = "PCWD", - }; - - switch(cmd) { - default: - return -ENOIOCTLCMD; - - 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(initial_status, argp); - - case WDIOC_GETTEMP: - if (pcwd_get_temperature(&temperature)) - return -EFAULT; - - return put_user(temperature, argp); - - case WDIOC_SETOPTIONS: - if (revision == PCWD_REVISION_C) - { - if(copy_from_user(&rv, argp, sizeof(int))) - return -EFAULT; - - if (rv & WDIOS_DISABLECARD) - { - return pcwd_stop(); - } - - if (rv & WDIOS_ENABLECARD) - { - return pcwd_start(); - } - - 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); - } - - 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 (!atomic_dec_and_test(&open_allowed) ) { - atomic_inc( &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 { - printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); - pcwd_keepalive(); - } - expect_close = 0; - atomic_inc( &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 (!supports_temp) - return -ENODEV; - - return nonseekable_open(inode, file); -} - -static int pcwd_temp_close(struct inode *inode, struct file *file) -{ - return 0; -} - -/* - * Notify system - */ - -static int pcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) -{ - if (code==SYS_DOWN || code==SYS_HALT) { - /* Turn the WDT off */ - pcwd_stop(); - } - - return NOTIFY_DONE; -} - -/* - * Kernel Interfaces - */ - -static struct file_operations pcwd_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = pcwd_write, - .ioctl = pcwd_ioctl, - .open = pcwd_open, - .release = pcwd_close, -}; - -static struct miscdevice pcwd_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &pcwd_fops, -}; - -static 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, -}; - -static struct notifier_block pcwd_notifier = { - .notifier_call = pcwd_notify_sys, -}; - -/* - * Init & exit routines - */ - -static inline void get_support(void) -{ - if (inb(current_readport) != 0xF0) - supports_temp = 1; -} - -static inline int get_revision(void) -{ - int r = PCWD_REVISION_C; - - spin_lock(&io_lock); - /* REV A cards use only 2 io ports; test - * presumes a floating bus reads as 0xff. */ - if ((inb(current_readport + 2) == 0xFF) || - (inb(current_readport + 3) == 0xFF)) - r=PCWD_REVISION_A; - spin_unlock(&io_lock); - - return r; -} - -static inline char *get_firmware(void) -{ - int one, ten, hund, minor; - char *ret; - - ret = kmalloc(6, GFP_KERNEL); - if(ret == NULL) - return NULL; - - 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(ret, "%c.%c%c%c", one, ten, hund, minor); - } - else - sprintf(ret, "ERROR"); - - unset_command_mode(); - return(ret); -} - -static inline int get_option_switches(void) -{ - int rv=0; - - if (set_command_mode()) { - /* Get switch settings */ - rv = send_isa_command(CMD_ISA_SWITCH_SETTINGS); - } - - unset_command_mode(); - return(rv); -} - -static int __devinit pcwatchdog_init(int base_addr) -{ - int ret; - char *firmware; - int option_switches; - - cards_found++; - if (cards_found == 1) - printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n", WD_VER); - - if (cards_found > 1) { - printk(KERN_ERR PFX "This driver only supports 1 device\n"); - return -ENODEV; - } - - if (base_addr == 0x0000) { - printk(KERN_ERR PFX "No I/O-Address for card detected\n"); - return -ENODEV; - } - current_readport = base_addr; - - /* Check card's revision */ - revision = get_revision(); - - if (!request_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) { - printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", - current_readport); - current_readport = 0x0000; - return -EIO; - } - - /* Initial variables */ - supports_temp = 0; - temp_panic = 0; - initial_status = 0x0000; - - /* get the boot_status */ - pcwd_get_status(&initial_status); - - /* clear the "card caused reboot" flag */ - pcwd_clear_status(); - - init_timer(&timer); - timer.function = pcwd_timer_ping; - timer.data = 0; - - /* Disable the board */ - pcwd_stop(); - - /* Check whether or not the card supports the temperature device */ - get_support(); - - /* Get some extra info from the hardware (in command/debug/diag mode) */ - if (revision == PCWD_REVISION_A) - printk(KERN_INFO PFX "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", current_readport); - else if (revision == PCWD_REVISION_C) { - firmware = get_firmware(); - printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n", - current_readport, firmware); - kfree(firmware); - option_switches = get_option_switches(); - printk(KERN_INFO PFX "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(); - } - } else { - /* Should NEVER happen, unless get_revision() fails. */ - printk(KERN_INFO PFX "Unable to get revision\n"); - release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4); - current_readport = 0x0000; - return -1; - } - - if (supports_temp) - printk(KERN_INFO PFX "Temperature Option Detected\n"); - - if (initial_status & WDIOF_CARDRESET) - printk(KERN_INFO PFX "Previous reboot was caused by the card\n"); - - if (initial_status & WDIOF_OVERHEAT) { - printk(KERN_EMERG PFX "Card senses a CPU Overheat. Panicking!\n"); - printk(KERN_EMERG PFX "CPU Overheat\n"); - } - - if (initial_status == 0) - printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n"); - - /* 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); - printk(KERN_INFO PFX "heartbeat value must be 2<=heartbeat<=7200, using %d\n", - WATCHDOG_HEARTBEAT); - } - - ret = register_reboot_notifier(&pcwd_notifier); - if (ret) { - printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", - ret); - release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4); - current_readport = 0x0000; - return ret; - } - - if (supports_temp) { - ret = misc_register(&temp_miscdev); - if (ret) { - printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", - TEMP_MINOR, ret); - unregister_reboot_notifier(&pcwd_notifier); - release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4); - current_readport = 0x0000; - return ret; - } - } - - ret = misc_register(&pcwd_miscdev); - if (ret) { - printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); - if (supports_temp) - misc_deregister(&temp_miscdev); - unregister_reboot_notifier(&pcwd_notifier); - release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4); - current_readport = 0x0000; - return ret; - } - - printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", - heartbeat, nowayout); - - return 0; -} - -static void __devexit pcwatchdog_exit(void) -{ - /* Disable the board */ - if (!nowayout) - pcwd_stop(); - - /* Deregister */ - misc_deregister(&pcwd_miscdev); - if (supports_temp) - misc_deregister(&temp_miscdev); - unregister_reboot_notifier(&pcwd_notifier); - release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4); - current_readport = 0x0000; -} - -/* - * 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 __init pcwd_checkcard(int base_addr) -{ - 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 (!request_region (base_addr, 4, "PCWD")) { - printk (KERN_INFO PFX "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; -} - -/* - * 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. - */ -static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 }; - -static int __init pcwd_init_module(void) -{ - int i, found = 0; - - spin_lock_init(&io_lock); - - for (i = 0; pcwd_ioports[i] != 0; i++) { - if (pcwd_checkcard(pcwd_ioports[i])) { - if (!(pcwatchdog_init(pcwd_ioports[i]))) - found++; - } - } - - if (!found) { - printk (KERN_INFO PFX "No card detected, or port not available\n"); - return -ENODEV; - } - - return 0; -} - -static void __exit pcwd_cleanup_module(void) -{ - if (current_readport) - pcwatchdog_exit(); - return; -} - -module_init(pcwd_init_module); -module_exit(pcwd_cleanup_module); - -MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>"); -MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); -MODULE_ALIAS_MISCDEV(TEMP_MINOR); |