diff options
Diffstat (limited to 'drivers/char/watchdog/i6300esb.c')
| -rw-r--r-- | drivers/char/watchdog/i6300esb.c | 527 |
1 files changed, 0 insertions, 527 deletions
diff --git a/drivers/char/watchdog/i6300esb.c b/drivers/char/watchdog/i6300esb.c deleted file mode 100644 index c5982502c03..00000000000 --- a/drivers/char/watchdog/i6300esb.c +++ /dev/null @@ -1,527 +0,0 @@ -/* - * i6300esb: Watchdog timer driver for Intel 6300ESB chipset - * - * (c) Copyright 2004 Google Inc. - * (c) Copyright 2005 David Härdeman <david@2gen.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. - * - * based on i810-tco.c which is in turn based on softdog.c - * - * The timer is implemented in the following I/O controller hubs: - * (See the intel documentation on http://developer.intel.com.) - * 6300ESB chip : document number 300641-003 - * - * 2004YYZZ Ross Biro - * Initial version 0.01 - * 2004YYZZ Ross Biro - * Version 0.02 - * 20050210 David Härdeman <david@2gen.com> - * Ported driver to kernel 2.6 - */ - -/* - * Includes, defines, variables, module parameters, ... - */ - -#include <linux/module.h> -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/fs.h> -#include <linux/mm.h> -#include <linux/miscdevice.h> -#include <linux/watchdog.h> -#include <linux/reboot.h> -#include <linux/init.h> -#include <linux/pci.h> -#include <linux/ioport.h> - -#include <asm/uaccess.h> -#include <asm/io.h> - -/* Module and version information */ -#define ESB_VERSION "0.03" -#define ESB_MODULE_NAME "i6300ESB timer" -#define ESB_DRIVER_NAME ESB_MODULE_NAME ", v" ESB_VERSION -#define PFX ESB_MODULE_NAME ": " - -/* PCI configuration registers */ -#define ESB_CONFIG_REG 0x60 /* Config register */ -#define ESB_LOCK_REG 0x68 /* WDT lock register */ - -/* Memory mapped registers */ -#define ESB_TIMER1_REG BASEADDR + 0x00 /* Timer1 value after each reset */ -#define ESB_TIMER2_REG BASEADDR + 0x04 /* Timer2 value after each reset */ -#define ESB_GINTSR_REG BASEADDR + 0x08 /* General Interrupt Status Register */ -#define ESB_RELOAD_REG BASEADDR + 0x0c /* Reload register */ - -/* Lock register bits */ -#define ESB_WDT_FUNC ( 0x01 << 2 ) /* Watchdog functionality */ -#define ESB_WDT_ENABLE ( 0x01 << 1 ) /* Enable WDT */ -#define ESB_WDT_LOCK ( 0x01 << 0 ) /* Lock (nowayout) */ - -/* Config register bits */ -#define ESB_WDT_REBOOT ( 0x01 << 5 ) /* Enable reboot on timeout */ -#define ESB_WDT_FREQ ( 0x01 << 2 ) /* Decrement frequency */ -#define ESB_WDT_INTTYPE ( 0x11 << 0 ) /* Interrupt type on timer1 timeout */ - -/* Reload register bits */ -#define ESB_WDT_RELOAD ( 0x01 << 8 ) /* prevent timeout */ - -/* Magic constants */ -#define ESB_UNLOCK1 0x80 /* Step 1 to unlock reset registers */ -#define ESB_UNLOCK2 0x86 /* Step 2 to unlock reset registers */ - -/* internal variables */ -static void __iomem *BASEADDR; -static spinlock_t esb_lock; /* Guards the hardware */ -static unsigned long timer_alive; -static struct pci_dev *esb_pci; -static unsigned short triggered; /* The status of the watchdog upon boot */ -static char esb_expect_close; - -/* module parameters */ -#define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat (1<heartbeat<2*1023) */ -static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */ -module_param(heartbeat, int, 0); -MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (1<heartbeat<2046, 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=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); - -/* - * Some i6300ESB specific functions - */ - -/* - * Prepare for reloading the timer by unlocking the proper registers. - * This is performed by first writing 0x80 followed by 0x86 to the - * reload register. After this the appropriate registers can be written - * to once before they need to be unlocked again. - */ -static inline void esb_unlock_registers(void) { - writeb(ESB_UNLOCK1, ESB_RELOAD_REG); - writeb(ESB_UNLOCK2, ESB_RELOAD_REG); -} - -static void esb_timer_start(void) -{ - u8 val; - - /* Enable or Enable + Lock? */ - val = 0x02 | (nowayout ? 0x01 : 0x00); - - pci_write_config_byte(esb_pci, ESB_LOCK_REG, val); -} - -static int esb_timer_stop(void) -{ - u8 val; - - spin_lock(&esb_lock); - /* First, reset timers as suggested by the docs */ - esb_unlock_registers(); - writew(ESB_WDT_RELOAD, ESB_RELOAD_REG); - /* Then disable the WDT */ - pci_write_config_byte(esb_pci, ESB_LOCK_REG, 0x0); - pci_read_config_byte(esb_pci, ESB_LOCK_REG, &val); - spin_unlock(&esb_lock); - - /* Returns 0 if the timer was disabled, non-zero otherwise */ - return (val & 0x01); -} - -static void esb_timer_keepalive(void) -{ - spin_lock(&esb_lock); - esb_unlock_registers(); - writew(ESB_WDT_RELOAD, ESB_RELOAD_REG); - /* FIXME: Do we need to flush anything here? */ - spin_unlock(&esb_lock); -} - -static int esb_timer_set_heartbeat(int time) -{ - u32 val; - - if (time < 0x1 || time > (2 * 0x03ff)) - return -EINVAL; - - spin_lock(&esb_lock); - - /* We shift by 9, so if we are passed a value of 1 sec, - * val will be 1 << 9 = 512, then write that to two - * timers => 2 * 512 = 1024 (which is decremented at 1KHz) - */ - val = time << 9; - - /* Write timer 1 */ - esb_unlock_registers(); - writel(val, ESB_TIMER1_REG); - - /* Write timer 2 */ - esb_unlock_registers(); - writel(val, ESB_TIMER2_REG); - - /* Reload */ - esb_unlock_registers(); - writew(ESB_WDT_RELOAD, ESB_RELOAD_REG); - - /* FIXME: Do we need to flush everything out? */ - - /* Done */ - heartbeat = time; - spin_unlock(&esb_lock); - return 0; -} - -static int esb_timer_read (void) -{ - u32 count; - - /* This isn't documented, and doesn't take into - * acount which stage is running, but it looks - * like a 20 bit count down, so we might as well report it. - */ - pci_read_config_dword(esb_pci, 0x64, &count); - return (int)count; -} - -/* - * /dev/watchdog handling - */ - -static int esb_open (struct inode *inode, struct file *file) -{ - /* /dev/watchdog can only be opened once */ - if (test_and_set_bit(0, &timer_alive)) - return -EBUSY; - - /* Reload and activate timer */ - esb_timer_keepalive (); - esb_timer_start (); - - return nonseekable_open(inode, file); -} - -static int esb_release (struct inode *inode, struct file *file) -{ - /* Shut off the timer. */ - if (esb_expect_close == 42) { - esb_timer_stop (); - } else { - printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); - esb_timer_keepalive (); - } - clear_bit(0, &timer_alive); - esb_expect_close = 0; - return 0; -} - -static ssize_t esb_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... */ - esb_expect_close = 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') - esb_expect_close = 42; - } - } - - /* someone wrote to us, we should reload the timer */ - esb_timer_keepalive (); - } - return len; -} - -static int esb_ioctl (struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) -{ - int new_options, retval = -EINVAL; - int new_heartbeat; - void __user *argp = (void __user *)arg; - int __user *p = argp; - static struct watchdog_info ident = { - .options = WDIOF_SETTIMEOUT | - WDIOF_KEEPALIVEPING | - WDIOF_MAGICCLOSE, - .firmware_version = 0, - .identity = ESB_MODULE_NAME, - }; - - switch (cmd) { - case WDIOC_GETSUPPORT: - return copy_to_user(argp, &ident, - sizeof (ident)) ? -EFAULT : 0; - - case WDIOC_GETSTATUS: - return put_user (esb_timer_read(), p); - - case WDIOC_GETBOOTSTATUS: - return put_user (triggered, p); - - case WDIOC_KEEPALIVE: - esb_timer_keepalive (); - return 0; - - case WDIOC_SETOPTIONS: - { - if (get_user (new_options, p)) - return -EFAULT; - - if (new_options & WDIOS_DISABLECARD) { - esb_timer_stop (); - retval = 0; - } - - if (new_options & WDIOS_ENABLECARD) { - esb_timer_keepalive (); - esb_timer_start (); - retval = 0; - } - - return retval; - } - - case WDIOC_SETTIMEOUT: - { - if (get_user(new_heartbeat, p)) - return -EFAULT; - - if (esb_timer_set_heartbeat(new_heartbeat)) - return -EINVAL; - - esb_timer_keepalive (); - /* Fall */ - } - - case WDIOC_GETTIMEOUT: - return put_user(heartbeat, p); - - default: - return -ENOTTY; - } -} - -/* - * Notify system - */ - -static int esb_notify_sys (struct notifier_block *this, unsigned long code, void *unused) -{ - if (code==SYS_DOWN || code==SYS_HALT) { - /* Turn the WDT off */ - esb_timer_stop (); - } - - return NOTIFY_DONE; -} - -/* - * Kernel Interfaces - */ - -static const struct file_operations esb_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = esb_write, - .ioctl = esb_ioctl, - .open = esb_open, - .release = esb_release, -}; - -static struct miscdevice esb_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &esb_fops, -}; - -static struct notifier_block esb_notifier = { - .notifier_call = esb_notify_sys, -}; - -/* - * Data for PCI driver interface - * - * This data only exists for exporting the supported - * PCI ids via MODULE_DEVICE_TABLE. We do not actually - * register a pci_driver, because someone else might one day - * want to register another driver on the same PCI id. - */ -static struct pci_device_id esb_pci_tbl[] = { - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_9), }, - { 0, }, /* End of list */ -}; -MODULE_DEVICE_TABLE (pci, esb_pci_tbl); - -/* - * Init & exit routines - */ - -static unsigned char __init esb_getdevice (void) -{ - u8 val1; - unsigned short val2; - - struct pci_dev *dev = NULL; - /* - * Find the PCI device - */ - - for_each_pci_dev(dev) { - if (pci_match_id(esb_pci_tbl, dev)) { - esb_pci = dev; - break; - } - } - - if (esb_pci) { - if (pci_enable_device(esb_pci)) { - printk (KERN_ERR PFX "failed to enable device\n"); - goto err_devput; - } - - if (pci_request_region(esb_pci, 0, ESB_MODULE_NAME)) { - printk (KERN_ERR PFX "failed to request region\n"); - goto err_disable; - } - - BASEADDR = ioremap(pci_resource_start(esb_pci, 0), - pci_resource_len(esb_pci, 0)); - if (BASEADDR == NULL) { - /* Something's wrong here, BASEADDR has to be set */ - printk (KERN_ERR PFX "failed to get BASEADDR\n"); - goto err_release; - } - - /* - * The watchdog has two timers, it can be setup so that the - * expiry of timer1 results in an interrupt and the expiry of - * timer2 results in a reboot. We set it to not generate - * any interrupts as there is not much we can do with it - * right now. - * - * We also enable reboots and set the timer frequency to - * the PCI clock divided by 2^15 (approx 1KHz). - */ - pci_write_config_word(esb_pci, ESB_CONFIG_REG, 0x0003); - - /* Check that the WDT isn't already locked */ - pci_read_config_byte(esb_pci, ESB_LOCK_REG, &val1); - if (val1 & ESB_WDT_LOCK) - printk (KERN_WARNING PFX "nowayout already set\n"); - - /* Set the timer to watchdog mode and disable it for now */ - pci_write_config_byte(esb_pci, ESB_LOCK_REG, 0x00); - - /* Check if the watchdog was previously triggered */ - esb_unlock_registers(); - val2 = readw(ESB_RELOAD_REG); - triggered = (val2 & (0x01 << 9) >> 9); - - /* Reset trigger flag and timers */ - esb_unlock_registers(); - writew((0x11 << 8), ESB_RELOAD_REG); - - /* Done */ - return 1; - -err_release: - pci_release_region(esb_pci, 0); -err_disable: - pci_disable_device(esb_pci); -err_devput: - pci_dev_put(esb_pci); - } - return 0; -} - -static int __init watchdog_init (void) -{ - int ret; - - spin_lock_init(&esb_lock); - - /* Check whether or not the hardware watchdog is there */ - if (!esb_getdevice () || esb_pci == NULL) - return -ENODEV; - - /* Check that the heartbeat value is within it's range ; if not reset to the default */ - if (esb_timer_set_heartbeat (heartbeat)) { - esb_timer_set_heartbeat (WATCHDOG_HEARTBEAT); - printk(KERN_INFO PFX "heartbeat value must be 1<heartbeat<2046, using %d\n", - heartbeat); - } - - ret = register_reboot_notifier(&esb_notifier); - if (ret != 0) { - printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", - ret); - goto err_unmap; - } - - ret = misc_register(&esb_miscdev); - if (ret != 0) { - printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); - goto err_notifier; - } - - esb_timer_stop (); - - printk (KERN_INFO PFX "initialized (0x%p). heartbeat=%d sec (nowayout=%d)\n", - BASEADDR, heartbeat, nowayout); - - return 0; - -err_notifier: - unregister_reboot_notifier(&esb_notifier); -err_unmap: - iounmap(BASEADDR); -/* err_release: */ - pci_release_region(esb_pci, 0); -/* err_disable: */ - pci_disable_device(esb_pci); -/* err_devput: */ - pci_dev_put(esb_pci); - return ret; -} - -static void __exit watchdog_cleanup (void) -{ - /* Stop the timer before we leave */ - if (!nowayout) - esb_timer_stop (); - - /* Deregister */ - misc_deregister(&esb_miscdev); - unregister_reboot_notifier(&esb_notifier); - iounmap(BASEADDR); - pci_release_region(esb_pci, 0); - pci_disable_device(esb_pci); - pci_dev_put(esb_pci); -} - -module_init(watchdog_init); -module_exit(watchdog_cleanup); - -MODULE_AUTHOR("Ross Biro and David Härdeman"); -MODULE_DESCRIPTION("Watchdog driver for Intel 6300ESB chipsets"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |