diff options
Diffstat (limited to 'drivers/char/watchdog/pcwd_pci.c')
| -rw-r--r-- | drivers/char/watchdog/pcwd_pci.c | 672 |
1 files changed, 0 insertions, 672 deletions
diff --git a/drivers/char/watchdog/pcwd_pci.c b/drivers/char/watchdog/pcwd_pci.c deleted file mode 100644 index 2b13afb09c5..00000000000 --- a/drivers/char/watchdog/pcwd_pci.c +++ /dev/null @@ -1,672 +0,0 @@ -/* - * Berkshire PCI-PC Watchdog Card Driver - * - * (c) Copyright 2003 Wim Van Sebroeck <wim@iguana.be>. - * - * Based on source code of the following authors: - * Ken Hollis <kenji@bitgate.com>, - * Lindsay Harris <lindsay@bluegum.com>, - * Alan Cox <alan@redhat.com>, - * Matt Domsch <Matt_Domsch@dell.com>, - * Rob Radez <rob@osinvestor.com> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * - * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor - * provide warranty for any of this software. This material is - * provided "AS-IS" and at no charge. - */ - -/* - * 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/ - */ - -/* - * Includes, defines, variables, module parameters, ... - */ - -#include <linux/config.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/types.h> -#include <linux/delay.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/notifier.h> -#include <linux/reboot.h> -#include <linux/init.h> -#include <linux/fs.h> -#include <linux/pci.h> -#include <linux/ioport.h> -#include <linux/spinlock.h> - -#include <asm/uaccess.h> -#include <asm/io.h> - -/* Module and version information */ -#define WATCHDOG_VERSION "1.01" -#define WATCHDOG_DATE "15 Mar 2005" -#define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog" -#define WATCHDOG_NAME "pcwd_pci" -#define PFX WATCHDOG_NAME ": " -#define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n" - -/* Stuff for the PCI ID's */ -#ifndef PCI_VENDOR_ID_QUICKLOGIC -#define PCI_VENDOR_ID_QUICKLOGIC 0x11e3 -#endif - -#ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD -#define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030 -#endif - -/* - * These are the defines that describe the control status bits for the - * PCI-PC Watchdog card. - */ -#define WD_PCI_WTRP 0x01 /* Watchdog Trip status */ -#define WD_PCI_HRBT 0x02 /* Watchdog Heartbeat */ -#define WD_PCI_TTRP 0x04 /* Temperature Trip status */ - -/* according to documentation max. time to process a command for the pci - * watchdog card is 100 ms, so we give it 150 ms to do it's job */ -#define PCI_COMMAND_TIMEOUT 150 - -/* Watchdog's internal commands */ -#define CMD_GET_STATUS 0x04 -#define CMD_GET_FIRMWARE_VERSION 0x08 -#define CMD_READ_WATCHDOG_TIMEOUT 0x18 -#define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 - -/* We can only use 1 card due to the /dev/watchdog restriction */ -static int cards_found; - -/* internal variables */ -static int temp_panic; -static unsigned long is_active; -static char expect_release; -static struct { - int supports_temp; /* Wether or not the card has a temperature device */ - int boot_status; /* The card's boot status */ - unsigned long io_addr; /* The cards I/O address */ - spinlock_t io_lock; - struct pci_dev *pdev; -} pcipcwd_private; - -/* module parameters */ -#define WATCHDOG_HEARTBEAT 2 /* 2 sec default heartbeat */ -static int heartbeat = WATCHDOG_HEARTBEAT; -module_param(heartbeat, int, 0); -MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, 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_command(int cmd, int *msb, int *lsb) -{ - int got_response, count; - - spin_lock(&pcipcwd_private.io_lock); - /* If a command requires data it should be written first. - * Data for commands with 8 bits of data should be written to port 4. - * Commands with 16 bits of data, should be written as LSB to port 4 - * and MSB to port 5. - * After the required data has been written then write the command to - * port 6. */ - outb_p(*lsb, pcipcwd_private.io_addr + 4); - outb_p(*msb, pcipcwd_private.io_addr + 5); - outb_p(cmd, pcipcwd_private.io_addr + 6); - - /* wait till the pci card processed the command, signaled by - * the WRSP bit in port 2 and give it a max. timeout of - * PCI_COMMAND_TIMEOUT to process */ - got_response = inb_p(pcipcwd_private.io_addr + 2) & 0x40; - for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); count++) { - mdelay(1); - got_response = inb_p(pcipcwd_private.io_addr + 2) & 0x40; - } - - if (got_response) { - /* read back response */ - *lsb = inb_p(pcipcwd_private.io_addr + 4); - *msb = inb_p(pcipcwd_private.io_addr + 5); - - /* clear WRSP bit */ - inb_p(pcipcwd_private.io_addr + 6); - } - spin_unlock(&pcipcwd_private.io_lock); - - return got_response; -} - -static int pcipcwd_start(void) -{ - int stat_reg; - - spin_lock(&pcipcwd_private.io_lock); - outb_p(0x00, pcipcwd_private.io_addr + 3); - udelay(1000); - - stat_reg = inb_p(pcipcwd_private.io_addr + 2); - spin_unlock(&pcipcwd_private.io_lock); - - if (stat_reg & 0x10) { - printk(KERN_ERR PFX "Card timer not enabled\n"); - return -1; - } - - return 0; -} - -static int pcipcwd_stop(void) -{ - int stat_reg; - - spin_lock(&pcipcwd_private.io_lock); - outb_p(0xA5, pcipcwd_private.io_addr + 3); - udelay(1000); - - outb_p(0xA5, pcipcwd_private.io_addr + 3); - udelay(1000); - - stat_reg = inb_p(pcipcwd_private.io_addr + 2); - spin_unlock(&pcipcwd_private.io_lock); - - if (!(stat_reg & 0x10)) { - printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n"); - return -1; - } - - return 0; -} - -static int pcipcwd_keepalive(void) -{ - /* Re-trigger watchdog by writing to port 0 */ - outb_p(0x42, pcipcwd_private.io_addr); - return 0; -} - -static int pcipcwd_set_heartbeat(int t) -{ - int t_msb = t / 256; - int t_lsb = t % 256; - - if ((t < 0x0001) || (t > 0xFFFF)) - return -EINVAL; - - /* Write new heartbeat to watchdog */ - send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb); - - heartbeat = t; - return 0; -} - -static int pcipcwd_get_status(int *status) -{ - int new_status; - - *status=0; - new_status = inb_p(pcipcwd_private.io_addr + 1); - if (new_status & WD_PCI_WTRP) - *status |= WDIOF_CARDRESET; - if (new_status & WD_PCI_TTRP) { - *status |= WDIOF_OVERHEAT; - if (temp_panic) - panic(PFX "Temperature overheat trip!\n"); - } - - return 0; -} - -static int pcipcwd_clear_status(void) -{ - outb_p(0x01, pcipcwd_private.io_addr + 1); - return 0; -} - -static int pcipcwd_get_temperature(int *temperature) -{ - *temperature = 0; - if (!pcipcwd_private.supports_temp) - return -ENODEV; - - /* - * Convert celsius to fahrenheit, since this was - * the decided 'standard' for this return value. - */ - *temperature = ((inb_p(pcipcwd_private.io_addr)) * 9 / 5) + 32; - - return 0; -} - -/* - * /dev/watchdog handling - */ - -static ssize_t pcipcwd_write(struct file *file, const char __user *data, - size_t len, loff_t *ppos) -{ - /* See if we got the magic character 'V' and reload the timer */ - if (len) { - if (!nowayout) { - size_t i; - - /* note: just in case someone wrote the magic character - * five months ago... */ - expect_release = 0; - - /* scan to see whether or not we got the magic character */ - for (i = 0; i != len; i++) { - char c; - if(get_user(c, data+i)) - return -EFAULT; - if (c == 'V') - expect_release = 42; - } - } - - /* someone wrote to us, we should reload the timer */ - pcipcwd_keepalive(); - } - return len; -} - -static int pcipcwd_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) -{ - void __user *argp = (void __user *)arg; - int __user *p = argp; - static struct watchdog_info ident = { - .options = WDIOF_OVERHEAT | - WDIOF_CARDRESET | - WDIOF_KEEPALIVEPING | - WDIOF_SETTIMEOUT | - WDIOF_MAGICCLOSE, - .firmware_version = 1, - .identity = WATCHDOG_DRIVER_NAME, - }; - - switch (cmd) { - case WDIOC_GETSUPPORT: - return copy_to_user(argp, &ident, - sizeof (ident)) ? -EFAULT : 0; - - case WDIOC_GETSTATUS: - { - int status; - - pcipcwd_get_status(&status); - - return put_user(status, p); - } - - case WDIOC_GETBOOTSTATUS: - return put_user(pcipcwd_private.boot_status, p); - - case WDIOC_GETTEMP: - { - int temperature; - - if (pcipcwd_get_temperature(&temperature)) - return -EFAULT; - - return put_user(temperature, p); - } - - case WDIOC_KEEPALIVE: - pcipcwd_keepalive(); - return 0; - - case WDIOC_SETOPTIONS: - { - int new_options, retval = -EINVAL; - - if (get_user (new_options, p)) - return -EFAULT; - - if (new_options & WDIOS_DISABLECARD) { - pcipcwd_stop(); - retval = 0; - } - - if (new_options & WDIOS_ENABLECARD) { - pcipcwd_start(); - retval = 0; - } - - if (new_options & WDIOS_TEMPPANIC) { - temp_panic = 1; - retval = 0; - } - - return retval; - } - - case WDIOC_SETTIMEOUT: - { - int new_heartbeat; - - if (get_user(new_heartbeat, p)) - return -EFAULT; - - if (pcipcwd_set_heartbeat(new_heartbeat)) - return -EINVAL; - - pcipcwd_keepalive(); - /* Fall */ - } - - case WDIOC_GETTIMEOUT: - return put_user(heartbeat, p); - - default: - return -ENOIOCTLCMD; - } -} - -static int pcipcwd_open(struct inode *inode, struct file *file) -{ - /* /dev/watchdog can only be opened once */ - if (test_and_set_bit(0, &is_active)) - return -EBUSY; - - /* Activate */ - pcipcwd_start(); - pcipcwd_keepalive(); - return nonseekable_open(inode, file); -} - -static int pcipcwd_release(struct inode *inode, struct file *file) -{ - /* - * Shut off the timer. - */ - if (expect_release == 42) { - pcipcwd_stop(); - } else { - printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); - pcipcwd_keepalive(); - } - expect_release = 0; - clear_bit(0, &is_active); - return 0; -} - -/* - * /dev/temperature handling - */ - -static ssize_t pcipcwd_temp_read(struct file *file, char __user *data, - size_t len, loff_t *ppos) -{ - int temperature; - - if (pcipcwd_get_temperature(&temperature)) - return -EFAULT; - - if (copy_to_user (data, &temperature, 1)) - return -EFAULT; - - return 1; -} - -static int pcipcwd_temp_open(struct inode *inode, struct file *file) -{ - if (!pcipcwd_private.supports_temp) - return -ENODEV; - - return nonseekable_open(inode, file); -} - -static int pcipcwd_temp_release(struct inode *inode, struct file *file) -{ - return 0; -} - -/* - * Notify system - */ - -static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) -{ - if (code==SYS_DOWN || code==SYS_HALT) { - /* Turn the WDT off */ - pcipcwd_stop(); - } - - return NOTIFY_DONE; -} - -/* - * Kernel Interfaces - */ - -static struct file_operations pcipcwd_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = pcipcwd_write, - .ioctl = pcipcwd_ioctl, - .open = pcipcwd_open, - .release = pcipcwd_release, -}; - -static struct miscdevice pcipcwd_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &pcipcwd_fops, -}; - -static struct file_operations pcipcwd_temp_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .read = pcipcwd_temp_read, - .open = pcipcwd_temp_open, - .release = pcipcwd_temp_release, -}; - -static struct miscdevice pcipcwd_temp_miscdev = { - .minor = TEMP_MINOR, - .name = "temperature", - .fops = &pcipcwd_temp_fops, -}; - -static struct notifier_block pcipcwd_notifier = { - .notifier_call = pcipcwd_notify_sys, -}; - -/* - * Init & exit routines - */ - -static inline void check_temperature_support(void) -{ - if (inb_p(pcipcwd_private.io_addr) != 0xF0) - pcipcwd_private.supports_temp = 1; -} - -static int __devinit pcipcwd_card_init(struct pci_dev *pdev, - const struct pci_device_id *ent) -{ - int ret = -EIO; - int got_fw_rev, fw_rev_major, fw_rev_minor; - char fw_ver_str[20]; - char option_switches; - - cards_found++; - if (cards_found == 1) - printk(KERN_INFO PFX DRIVER_VERSION); - - if (cards_found > 1) { - printk(KERN_ERR PFX "This driver only supports 1 device\n"); - return -ENODEV; - } - - if (pci_enable_device(pdev)) { - printk(KERN_ERR PFX "Not possible to enable PCI Device\n"); - return -ENODEV; - } - - if (pci_resource_start(pdev, 0) == 0x0000) { - printk(KERN_ERR PFX "No I/O-Address for card detected\n"); - ret = -ENODEV; - goto err_out_disable_device; - } - - pcipcwd_private.pdev = pdev; - pcipcwd_private.io_addr = pci_resource_start(pdev, 0); - - if (pci_request_regions(pdev, WATCHDOG_NAME)) { - printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", - (int) pcipcwd_private.io_addr); - ret = -EIO; - goto err_out_disable_device; - } - - /* get the boot_status */ - pcipcwd_get_status(&pcipcwd_private.boot_status); - - /* clear the "card caused reboot" flag */ - pcipcwd_clear_status(); - - /* disable card */ - pcipcwd_stop(); - - /* Check whether or not the card supports the temperature device */ - check_temperature_support(); - - /* Get the Firmware Version */ - got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor); - if (got_fw_rev) { - sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor); - } else { - sprintf(fw_ver_str, "<card no answer>"); - } - - /* Get switch settings */ - option_switches = inb_p(pcipcwd_private.io_addr + 3); - - printk(KERN_INFO PFX "Found card at port 0x%04x (Firmware: %s) %s temp option\n", - (int) pcipcwd_private.io_addr, fw_ver_str, - (pcipcwd_private.supports_temp ? "with" : "without")); - - 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")); - - if (pcipcwd_private.boot_status & WDIOF_CARDRESET) - printk(KERN_INFO PFX "Previous reset was caused by the Watchdog card\n"); - - if (pcipcwd_private.boot_status & WDIOF_OVERHEAT) - printk(KERN_INFO PFX "Card sensed a CPU Overheat\n"); - - if (pcipcwd_private.boot_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 (pcipcwd_set_heartbeat(heartbeat)) { - pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT); - printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n", - WATCHDOG_HEARTBEAT); - } - - ret = register_reboot_notifier(&pcipcwd_notifier); - if (ret != 0) { - printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", - ret); - goto err_out_release_region; - } - - if (pcipcwd_private.supports_temp) { - ret = misc_register(&pcipcwd_temp_miscdev); - if (ret != 0) { - printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", - TEMP_MINOR, ret); - goto err_out_unregister_reboot; - } - } - - ret = misc_register(&pcipcwd_miscdev); - if (ret != 0) { - printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); - goto err_out_misc_deregister; - } - - printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", - heartbeat, nowayout); - - return 0; - -err_out_misc_deregister: - if (pcipcwd_private.supports_temp) - misc_deregister(&pcipcwd_temp_miscdev); -err_out_unregister_reboot: - unregister_reboot_notifier(&pcipcwd_notifier); -err_out_release_region: - pci_release_regions(pdev); -err_out_disable_device: - pci_disable_device(pdev); - return ret; -} - -static void __devexit pcipcwd_card_exit(struct pci_dev *pdev) -{ - /* Stop the timer before we leave */ - if (!nowayout) - pcipcwd_stop(); - - /* Deregister */ - misc_deregister(&pcipcwd_miscdev); - if (pcipcwd_private.supports_temp) - misc_deregister(&pcipcwd_temp_miscdev); - unregister_reboot_notifier(&pcipcwd_notifier); - pci_release_regions(pdev); - pci_disable_device(pdev); - cards_found--; -} - -static struct pci_device_id pcipcwd_pci_tbl[] = { - { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD, - PCI_ANY_ID, PCI_ANY_ID, }, - { 0 }, /* End of list */ -}; -MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl); - -static struct pci_driver pcipcwd_driver = { - .name = WATCHDOG_NAME, - .id_table = pcipcwd_pci_tbl, - .probe = pcipcwd_card_init, - .remove = __devexit_p(pcipcwd_card_exit), -}; - -static int __init pcipcwd_init_module(void) -{ - spin_lock_init (&pcipcwd_private.io_lock); - - return pci_register_driver(&pcipcwd_driver); -} - -static void __exit pcipcwd_cleanup_module(void) -{ - pci_unregister_driver(&pcipcwd_driver); -} - -module_init(pcipcwd_init_module); -module_exit(pcipcwd_cleanup_module); - -MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>"); -MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); -MODULE_ALIAS_MISCDEV(TEMP_MINOR); |