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path: root/drivers/char/watchdog/pcwd_pci.c
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Diffstat (limited to 'drivers/char/watchdog/pcwd_pci.c')
-rw-r--r--drivers/char/watchdog/pcwd_pci.c677
1 files changed, 677 insertions, 0 deletions
diff --git a/drivers/char/watchdog/pcwd_pci.c b/drivers/char/watchdog/pcwd_pci.c
new file mode 100644
index 000000000000..8ce066627326
--- /dev/null
+++ b/drivers/char/watchdog/pcwd_pci.c
@@ -0,0 +1,677 @@
+/*
+ * 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) ")");
+
+#ifdef CONFIG_WATCHDOG_NOWAYOUT
+static int nowayout = 1;
+#else
+static int nowayout = 0;
+#endif
+
+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);
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-29 12:31:36 +0300