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