| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Wim Van Sebroeck | 2615 | 92.70% | 16 | 55.17% |
| Joe Perches | 144 | 5.10% | 1 | 3.45% |
| Al Viro | 28 | 0.99% | 1 | 3.45% |
| Alan Cox | 12 | 0.43% | 2 | 6.90% |
| Jingoo Han | 6 | 0.21% | 1 | 3.45% |
| Arnd Bergmann | 5 | 0.18% | 1 | 3.45% |
| Guenter Roeck | 2 | 0.07% | 1 | 3.45% |
| Gustavo A. R. Silva | 2 | 0.07% | 1 | 3.45% |
| Kirill Smelkov | 2 | 0.07% | 1 | 3.45% |
| Arjan van de Ven | 2 | 0.07% | 1 | 3.45% |
| Andrey Panin | 1 | 0.04% | 1 | 3.45% |
| Jean Delvare | 1 | 0.04% | 1 | 3.45% |
| Samuel Tardieu | 1 | 0.04% | 1 | 3.45% |
| Total | 2821 | 29 |
// SPDX-License-Identifier: GPL-2.0+ /* * Berkshire PCI-PC Watchdog Card Driver * * (c) Copyright 2003-2007 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@lxorguk.ukuu.org.uk>, * Matt Domsch <Matt_Domsch@dell.com>, * Rob Radez <rob@osinvestor.com> * * 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.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/ * * More info available at * http://www.berkprod.com/ or http://www.pcwatchdog.com/ */ /* * Includes, defines, variables, module parameters, ... */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> /* For module specific items */ #include <linux/moduleparam.h> /* For new moduleparam's */ #include <linux/types.h> /* For standard types (like size_t) */ #include <linux/errno.h> /* For the -ENODEV/... values */ #include <linux/kernel.h> /* For printk/panic/... */ #include <linux/delay.h> /* For mdelay function */ #include <linux/miscdevice.h> /* For struct miscdevice */ #include <linux/watchdog.h> /* For the watchdog specific items */ #include <linux/notifier.h> /* For notifier support */ #include <linux/reboot.h> /* For reboot_notifier stuff */ #include <linux/init.h> /* For __init/__exit/... */ #include <linux/fs.h> /* For file operations */ #include <linux/pci.h> /* For pci functions */ #include <linux/ioport.h> /* For io-port access */ #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ #include <linux/uaccess.h> /* For copy_to_user/put_user/... */ #include <linux/io.h> /* For inb/outb/... */ /* Module and version information */ #define WATCHDOG_VERSION "1.03" #define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog" #define WATCHDOG_NAME "pcwd_pci" #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION /* 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. */ /* Port 1 : Control Status #1 */ #define WD_PCI_WTRP 0x01 /* Watchdog Trip status */ #define WD_PCI_HRBT 0x02 /* Watchdog Heartbeat */ #define WD_PCI_TTRP 0x04 /* Temperature Trip status */ #define WD_PCI_RL2A 0x08 /* Relay 2 Active */ #define WD_PCI_RL1A 0x10 /* Relay 1 Active */ #define WD_PCI_R2DS 0x40 /* Relay 2 Disable Temperature-trip / reset */ #define WD_PCI_RLY2 0x80 /* Activate Relay 2 on the board */ /* Port 2 : Control Status #2 */ #define WD_PCI_WDIS 0x10 /* Watchdog Disable */ #define WD_PCI_ENTP 0x20 /* Enable Temperature Trip Reset */ #define WD_PCI_WRSP 0x40 /* Watchdog wrote response */ #define WD_PCI_PCMD 0x80 /* PC has sent command */ /* 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 #define CMD_GET_CLEAR_RESET_COUNT 0x84 /* Watchdog's Dip Switch heartbeat values */ static const int heartbeat_tbl[] = { 5, /* OFF-OFF-OFF = 5 Sec */ 10, /* OFF-OFF-ON = 10 Sec */ 30, /* OFF-ON-OFF = 30 Sec */ 60, /* OFF-ON-ON = 1 Min */ 300, /* ON-OFF-OFF = 5 Min */ 600, /* ON-OFF-ON = 10 Min */ 1800, /* ON-ON-OFF = 30 Min */ 3600, /* ON-ON-ON = 1 hour */ }; /* 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; /* this is private data for each PCI-PC watchdog card */ static struct { /* Wether or not the card has a temperature device */ int supports_temp; /* The card's boot status */ int boot_status; /* The cards I/O address */ unsigned long io_addr; /* the lock for io operations */ spinlock_t io_lock; /* the PCI-device */ struct pci_dev *pdev; } pcipcwd_private; /* module parameters */ #define QUIET 0 /* Default */ #define VERBOSE 1 /* Verbose */ #define DEBUG 2 /* print fancy stuff too */ static int debug = QUIET; module_param(debug, int, 0); MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)"); #define WATCHDOG_HEARTBEAT 0 /* default heartbeat = delay-time from dip-switches */ static int heartbeat = WATCHDOG_HEARTBEAT; module_param(heartbeat, int, 0); MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. " "(0<heartbeat<65536 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); /* * Internal functions */ static int send_command(int cmd, int *msb, int *lsb) { int got_response, count; if (debug >= DEBUG) pr_debug("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n", cmd, *msb, *lsb); 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) & WD_PCI_WRSP; for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); count++) { mdelay(1); got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP; } if (debug >= DEBUG) { if (got_response) { pr_debug("time to process command was: %d ms\n", count); } else { pr_debug("card did not respond on command!\n"); } } 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); if (debug >= DEBUG) pr_debug("received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n", cmd, *msb, *lsb); } spin_unlock(&pcipcwd_private.io_lock); return got_response; } static inline void pcipcwd_check_temperature_support(void) { if (inb_p(pcipcwd_private.io_addr) != 0xF0) pcipcwd_private.supports_temp = 1; } static int pcipcwd_get_option_switches(void) { int option_switches; option_switches = inb_p(pcipcwd_private.io_addr + 3); return option_switches; } static void pcipcwd_show_card_info(void) { int got_fw_rev, fw_rev_major, fw_rev_minor; char fw_ver_str[20]; /* The cards firmware version */ int option_switches; 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 = pcipcwd_get_option_switches(); pr_info("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")); pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", option_switches, ((option_switches & 0x10) ? "ON" : "OFF"), ((option_switches & 0x08) ? "ON" : "OFF")); if (pcipcwd_private.boot_status & WDIOF_CARDRESET) pr_info("Previous reset was caused by the Watchdog card\n"); if (pcipcwd_private.boot_status & WDIOF_OVERHEAT) pr_info("Card sensed a CPU Overheat\n"); if (pcipcwd_private.boot_status == 0) pr_info("No previous trip detected - Cold boot or reset\n"); } 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 & WD_PCI_WDIS) { pr_err("Card timer not enabled\n"); return -1; } if (debug >= VERBOSE) pr_debug("Watchdog started\n"); 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 & WD_PCI_WDIS)) { pr_err("Card did not acknowledge disable attempt\n"); return -1; } if (debug >= VERBOSE) pr_debug("Watchdog stopped\n"); return 0; } static int pcipcwd_keepalive(void) { /* Re-trigger watchdog by writing to port 0 */ spin_lock(&pcipcwd_private.io_lock); outb_p(0x42, pcipcwd_private.io_addr); /* send out any data */ spin_unlock(&pcipcwd_private.io_lock); if (debug >= DEBUG) pr_debug("Watchdog keepalive signal send\n"); 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; if (debug >= VERBOSE) pr_debug("New heartbeat: %d\n", heartbeat); return 0; } static int pcipcwd_get_status(int *status) { int control_status; *status = 0; control_status = inb_p(pcipcwd_private.io_addr + 1); if (control_status & WD_PCI_WTRP) *status |= WDIOF_CARDRESET; if (control_status & WD_PCI_TTRP) { *status |= WDIOF_OVERHEAT; if (temp_panic) panic(KBUILD_MODNAME ": Temperature overheat trip!\n"); } if (debug >= DEBUG) pr_debug("Control Status #1: 0x%02x\n", control_status); return 0; } static int pcipcwd_clear_status(void) { int control_status; int msb; int reset_counter; if (debug >= VERBOSE) pr_info("clearing watchdog trip status & LED\n"); control_status = inb_p(pcipcwd_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_PCI_R2DS) | WD_PCI_WTRP); } /* clear trip status & LED and keep mode of relay 2 */ outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP, pcipcwd_private.io_addr + 1); /* clear reset counter */ msb = 0; reset_counter = 0xff; send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter); if (debug >= DEBUG) { pr_debug("reset count was: 0x%02x\n", reset_counter); } return 0; } static int pcipcwd_get_temperature(int *temperature) { *temperature = 0; if (!pcipcwd_private.supports_temp) return -ENODEV; spin_lock(&pcipcwd_private.io_lock); *temperature = inb_p(pcipcwd_private.io_addr); spin_unlock(&pcipcwd_private.io_lock); /* * Convert celsius to fahrenheit, since this was * the decided 'standard' for this return value. */ *temperature = (*temperature * 9 / 5) + 32; if (debug >= DEBUG) { pr_debug("temperature is: %d F\n", *temperature); } return 0; } static int pcipcwd_get_timeleft(int *time_left) { int msb; int lsb; /* Read the time that's left before rebooting */ /* Note: if the board is not yet armed then we will read 0xFFFF */ send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb); *time_left = (msb << 8) + lsb; if (debug >= VERBOSE) pr_debug("Time left before next reboot: %d\n", *time_left); 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 long pcipcwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { void __user *argp = (void __user *)arg; int __user *p = argp; static const 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_SETOPTIONS: { int new_options, retval = -EINVAL; if (get_user(new_options, p)) return -EFAULT; if (new_options & WDIOS_DISABLECARD) { if (pcipcwd_stop()) return -EIO; retval = 0; } if (new_options & WDIOS_ENABLECARD) { if (pcipcwd_start()) return -EIO; retval = 0; } if (new_options & WDIOS_TEMPPANIC) { temp_panic = 1; retval = 0; } return retval; } case WDIOC_KEEPALIVE: pcipcwd_keepalive(); return 0; case WDIOC_SETTIMEOUT: { int new_heartbeat; if (get_user(new_heartbeat, p)) return -EFAULT; if (pcipcwd_set_heartbeat(new_heartbeat)) return -EINVAL; pcipcwd_keepalive(); } fallthrough; case WDIOC_GETTIMEOUT: return put_user(heartbeat, p); case WDIOC_GETTIMELEFT: { int time_left; if (pcipcwd_get_timeleft(&time_left)) return -EFAULT; return put_user(time_left, p); } default: return -ENOTTY; } } 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)) { if (debug >= VERBOSE) pr_err("Attempt to open already opened device\n"); return -EBUSY; } /* Activate */ pcipcwd_start(); pcipcwd_keepalive(); return stream_open(inode, file); } static int pcipcwd_release(struct inode *inode, struct file *file) { /* * Shut off the timer. */ if (expect_release == 42) { pcipcwd_stop(); } else { pr_crit("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 stream_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) pcipcwd_stop(); /* Turn the WDT off */ return NOTIFY_DONE; } /* * Kernel Interfaces */ static const struct file_operations pcipcwd_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = pcipcwd_write, .unlocked_ioctl = pcipcwd_ioctl, .compat_ioctl = compat_ptr_ioctl, .open = pcipcwd_open, .release = pcipcwd_release, }; static struct miscdevice pcipcwd_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &pcipcwd_fops, }; static const 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 int pcipcwd_card_init(struct pci_dev *pdev, const struct pci_device_id *ent) { int ret = -EIO; cards_found++; if (cards_found == 1) pr_info("%s\n", DRIVER_VERSION); if (cards_found > 1) { pr_err("This driver only supports 1 device\n"); return -ENODEV; } if (pci_enable_device(pdev)) { pr_err("Not possible to enable PCI Device\n"); return -ENODEV; } if (pci_resource_start(pdev, 0) == 0x0000) { pr_err("No I/O-Address for card detected\n"); ret = -ENODEV; goto err_out_disable_device; } spin_lock_init(&pcipcwd_private.io_lock); pcipcwd_private.pdev = pdev; pcipcwd_private.io_addr = pci_resource_start(pdev, 0); if (pci_request_regions(pdev, WATCHDOG_NAME)) { pr_err("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 */ pcipcwd_check_temperature_support(); /* Show info about the card itself */ pcipcwd_show_card_info(); /* If heartbeat = 0 then we use the heartbeat from the dip-switches */ if (heartbeat == 0) heartbeat = heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)]; /* 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); pr_info("heartbeat value must be 0<heartbeat<65536, using %d\n", WATCHDOG_HEARTBEAT); } ret = register_reboot_notifier(&pcipcwd_notifier); if (ret != 0) { pr_err("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) { pr_err("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) { pr_err("cannot register miscdev on minor=%d (err=%d)\n", WATCHDOG_MINOR, ret); goto err_out_misc_deregister; } pr_info("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 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 const 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 = pcipcwd_card_exit, }; module_pci_driver(pcipcwd_driver); MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>"); MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver"); MODULE_LICENSE("GPL");
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