+++ /dev/null
-/*
- * i8xx_tco: TCO timer driver for i8xx chipsets
- *
- * (c) Copyright 2000 kernel concepts <nils@kernelconcepts.de>, All Rights Reserved.
- * http://www.kernelconcepts.de
- *
- * 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 kernel concepts nor Nils Faerber admit liability nor provide
- * warranty for any of this software. This material is provided
- * "AS-IS" and at no charge.
- *
- * (c) Copyright 2000 kernel concepts <nils@kernelconcepts.de>
- * developed for
- * Jentro AG, Haar/Munich (Germany)
- *
- * TCO timer driver for i8xx chipsets
- * based on softdog.c by Alan Cox <alan@redhat.com>
- *
- * The TCO timer is implemented in the following I/O controller hubs:
- * (See the intel documentation on http://developer.intel.com.)
- * 82801AA (ICH) : document number 290655-003, 290677-014,
- * 82801AB (ICHO) : document number 290655-003, 290677-014,
- * 82801BA (ICH2) : document number 290687-002, 298242-027,
- * 82801BAM (ICH2-M) : document number 290687-002, 298242-027,
- * 82801CA (ICH3-S) : document number 290733-003, 290739-013,
- * 82801CAM (ICH3-M) : document number 290716-001, 290718-007,
- * 82801DB (ICH4) : document number 290744-001, 290745-020,
- * 82801DBM (ICH4-M) : document number 252337-001, 252663-005,
- * 82801E (C-ICH) : document number 273599-001, 273645-002,
- * 82801EB (ICH5) : document number 252516-001, 252517-003,
- * 82801ER (ICH5R) : document number 252516-001, 252517-003,
- *
- * 20000710 Nils Faerber
- * Initial Version 0.01
- * 20000728 Nils Faerber
- * 0.02 Fix for SMI_EN->TCO_EN bit, some cleanups
- * 20011214 Matt Domsch <Matt_Domsch@dell.com>
- * 0.03 Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
- * Didn't add timeout option as i810_margin already exists.
- * 20020224 Joel Becker, Wim Van Sebroeck
- * 0.04 Support for 82801CA(M) chipset, timer margin needs to be > 3,
- * add support for WDIOC_SETTIMEOUT and WDIOC_GETTIMEOUT.
- * 20020412 Rob Radez <rob@osinvestor.com>, Wim Van Sebroeck
- * 0.05 Fix possible timer_alive race, add expect close support,
- * clean up ioctls (WDIOC_GETSTATUS, WDIOC_GETBOOTSTATUS and
- * WDIOC_SETOPTIONS), made i810tco_getdevice __init,
- * removed boot_status, removed tco_timer_read,
- * added support for 82801DB and 82801E chipset,
- * added support for 82801EB and 8280ER chipset,
- * general cleanup.
- * 20030921 Wim Van Sebroeck <wim@iguana.be>
- * 0.06 change i810_margin to heartbeat, use module_param,
- * added notify system support, renamed module to i8xx_tco.
- * 20050128 Wim Van Sebroeck <wim@iguana.be>
- * 0.07 Added support for the ICH4-M, ICH6, ICH6R, ICH6-M, ICH6W and ICH6RW
- * chipsets. Also added support for the "undocumented" ICH7 chipset.
- * 20050807 Wim Van Sebroeck <wim@iguana.be>
- * 0.08 Make sure that the watchdog is only "armed" when started.
- * (Kernel Bug 4251)
- * 20060416 Wim Van Sebroeck <wim@iguana.be>
- * 0.09 Remove support for the ICH6, ICH6R, ICH6-M, ICH6W and ICH6RW and
- * ICH7 chipsets. (See Kernel Bug 6031 - other code will support these
- * chipsets)
- */
-
-/*
- * Includes, defines, variables, module parameters, ...
- */
-
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/types.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 <asm/uaccess.h>
-#include <asm/io.h>
-
-#include "i8xx_tco.h"
-
-/* Module and version information */
-#define TCO_VERSION "0.09"
-#define TCO_MODULE_NAME "i8xx TCO timer"
-#define TCO_DRIVER_NAME TCO_MODULE_NAME ", v" TCO_VERSION
-#define PFX TCO_MODULE_NAME ": "
-
-/* internal variables */
-static unsigned int ACPIBASE;
-static spinlock_t tco_lock; /* Guards the hardware */
-static unsigned long timer_alive;
-static char tco_expect_close;
-static struct pci_dev *i8xx_tco_pci;
-
-/* module parameters */
-#define WATCHDOG_HEARTBEAT 30 /* 30 sec default heartbeat (2<heartbeat<39) */
-static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
-module_param(heartbeat, int, 0);
-MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (2<heartbeat<39, 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 TCO specific functions
- */
-
-static inline unsigned char seconds_to_ticks(int seconds)
-{
- /* the internal timer is stored as ticks which decrement
- * every 0.6 seconds */
- return (seconds * 10) / 6;
-}
-
-static int tco_timer_start (void)
-{
- unsigned char val;
-
- spin_lock(&tco_lock);
-
- /* disable chipset's NO_REBOOT bit */
- pci_read_config_byte (i8xx_tco_pci, 0xd4, &val);
- val &= 0xfd;
- pci_write_config_byte (i8xx_tco_pci, 0xd4, val);
-
- /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */
- val = inb (TCO1_CNT + 1);
- val &= 0xf7;
- outb (val, TCO1_CNT + 1);
- val = inb (TCO1_CNT + 1);
-
- spin_unlock(&tco_lock);
-
- if (val & 0x08)
- return -1;
- return 0;
-}
-
-static int tco_timer_stop (void)
-{
- unsigned char val, val1;
-
- spin_lock(&tco_lock);
- /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */
- val = inb (TCO1_CNT + 1);
- val |= 0x08;
- outb (val, TCO1_CNT + 1);
- val = inb (TCO1_CNT + 1);
-
- /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
- pci_read_config_byte (i8xx_tco_pci, 0xd4, &val1);
- val1 |= 0x02;
- pci_write_config_byte (i8xx_tco_pci, 0xd4, val1);
-
- spin_unlock(&tco_lock);
-
- if ((val & 0x08) == 0)
- return -1;
- return 0;
-}
-
-static int tco_timer_keepalive (void)
-{
- spin_lock(&tco_lock);
- /* Reload the timer by writing to the TCO Timer Reload register */
- outb (0x01, TCO1_RLD);
- spin_unlock(&tco_lock);
- return 0;
-}
-
-static int tco_timer_set_heartbeat (int t)
-{
- unsigned char val;
- unsigned char tmrval;
-
- tmrval = seconds_to_ticks(t);
- /* from the specs: */
- /* "Values of 0h-3h are ignored and should not be attempted" */
- if (tmrval > 0x3f || tmrval < 0x04)
- return -EINVAL;
-
- /* Write new heartbeat to watchdog */
- spin_lock(&tco_lock);
- val = inb (TCO1_TMR);
- val &= 0xc0;
- val |= tmrval;
- outb (val, TCO1_TMR);
- val = inb (TCO1_TMR);
- spin_unlock(&tco_lock);
-
- if ((val & 0x3f) != tmrval)
- return -EINVAL;
-
- heartbeat = t;
- return 0;
-}
-
-static int tco_timer_get_timeleft (int *time_left)
-{
- unsigned char val;
-
- spin_lock(&tco_lock);
-
- /* read the TCO Timer */
- val = inb (TCO1_RLD);
- val &= 0x3f;
-
- spin_unlock(&tco_lock);
-
- *time_left = (int)((val * 6) / 10);
-
- return 0;
-}
-
-/*
- * /dev/watchdog handling
- */
-
-static int i8xx_tco_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
- */
- tco_timer_keepalive ();
- tco_timer_start ();
- return nonseekable_open(inode, file);
-}
-
-static int i8xx_tco_release (struct inode *inode, struct file *file)
-{
- /*
- * Shut off the timer.
- */
- if (tco_expect_close == 42) {
- tco_timer_stop ();
- } else {
- printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
- tco_timer_keepalive ();
- }
- clear_bit(0, &timer_alive);
- tco_expect_close = 0;
- return 0;
-}
-
-static ssize_t i8xx_tco_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... */
- tco_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')
- tco_expect_close = 42;
- }
- }
-
- /* someone wrote to us, we should reload the timer */
- tco_timer_keepalive ();
- }
- return len;
-}
-
-static int i8xx_tco_ioctl (struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- int new_options, retval = -EINVAL;
- int new_heartbeat;
- int time_left;
- 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 = TCO_MODULE_NAME,
- };
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- return copy_to_user(argp, &ident,
- sizeof (ident)) ? -EFAULT : 0;
-
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user (0, p);
-
- case WDIOC_KEEPALIVE:
- tco_timer_keepalive ();
- return 0;
-
- case WDIOC_SETOPTIONS:
- {
- if (get_user (new_options, p))
- return -EFAULT;
-
- if (new_options & WDIOS_DISABLECARD) {
- tco_timer_stop ();
- retval = 0;
- }
-
- if (new_options & WDIOS_ENABLECARD) {
- tco_timer_keepalive ();
- tco_timer_start ();
- retval = 0;
- }
-
- return retval;
- }
-
- case WDIOC_SETTIMEOUT:
- {
- if (get_user(new_heartbeat, p))
- return -EFAULT;
-
- if (tco_timer_set_heartbeat(new_heartbeat))
- return -EINVAL;
-
- tco_timer_keepalive ();
- /* Fall */
- }
-
- case WDIOC_GETTIMEOUT:
- return put_user(heartbeat, p);
-
- case WDIOC_GETTIMELEFT:
- {
- if (tco_timer_get_timeleft(&time_left))
- return -EINVAL;
-
- return put_user(time_left, p);
- }
-
- default:
- return -ENOTTY;
- }
-}
-
-/*
- * Notify system
- */
-
-static int i8xx_tco_notify_sys (struct notifier_block *this, unsigned long code, void *unused)
-{
- if (code==SYS_DOWN || code==SYS_HALT) {
- /* Turn the WDT off */
- tco_timer_stop ();
- }
-
- return NOTIFY_DONE;
-}
-
-/*
- * Kernel Interfaces
- */
-
-static const struct file_operations i8xx_tco_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = i8xx_tco_write,
- .ioctl = i8xx_tco_ioctl,
- .open = i8xx_tco_open,
- .release = i8xx_tco_release,
-};
-
-static struct miscdevice i8xx_tco_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &i8xx_tco_fops,
-};
-
-static struct notifier_block i8xx_tco_notifier = {
- .notifier_call = i8xx_tco_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 i8xx_tco_pci_tbl[] = {
- { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_0) },
- { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_0) },
- { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0) },
- { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_10) },
- { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0) },
- { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12) },
- { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0) },
- { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12) },
- { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801E_0) },
- { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0) },
- { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ESB_1) },
- { }, /* End of list */
-};
-MODULE_DEVICE_TABLE (pci, i8xx_tco_pci_tbl);
-
-/*
- * Init & exit routines
- */
-
-static unsigned char __init i8xx_tco_getdevice (void)
-{
- struct pci_dev *dev = NULL;
- u8 val1, val2;
- u16 badr;
- /*
- * Find the PCI device
- */
-
- for_each_pci_dev(dev)
- if (pci_match_id(i8xx_tco_pci_tbl, dev)) {
- i8xx_tco_pci = dev;
- break;
- }
-
- if (i8xx_tco_pci) {
- /*
- * Find the ACPI base I/O address which is the base
- * for the TCO registers (TCOBASE=ACPIBASE + 0x60)
- * ACPIBASE is bits [15:7] from 0x40-0x43
- */
- pci_read_config_byte (i8xx_tco_pci, 0x40, &val1);
- pci_read_config_byte (i8xx_tco_pci, 0x41, &val2);
- badr = ((val2 << 1) | (val1 >> 7)) << 7;
- ACPIBASE = badr;
- /* Something's wrong here, ACPIBASE has to be set */
- if (badr == 0x0001 || badr == 0x0000) {
- printk (KERN_ERR PFX "failed to get TCOBASE address\n");
- pci_dev_put(i8xx_tco_pci);
- return 0;
- }
-
- /* Check chipset's NO_REBOOT bit */
- pci_read_config_byte (i8xx_tco_pci, 0xd4, &val1);
- if (val1 & 0x02) {
- val1 &= 0xfd;
- pci_write_config_byte (i8xx_tco_pci, 0xd4, val1);
- pci_read_config_byte (i8xx_tco_pci, 0xd4, &val1);
- if (val1 & 0x02) {
- printk (KERN_ERR PFX "failed to reset NO_REBOOT flag, reboot disabled by hardware\n");
- pci_dev_put(i8xx_tco_pci);
- return 0; /* Cannot reset NO_REBOOT bit */
- }
- }
- /* Disable reboots untill the watchdog starts */
- val1 |= 0x02;
- pci_write_config_byte (i8xx_tco_pci, 0xd4, val1);
-
- /* Set the TCO_EN bit in SMI_EN register */
- if (!request_region (SMI_EN + 1, 1, "i8xx TCO")) {
- printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
- SMI_EN + 1);
- pci_dev_put(i8xx_tco_pci);
- return 0;
- }
- val1 = inb (SMI_EN + 1);
- val1 &= 0xdf;
- outb (val1, SMI_EN + 1);
- release_region (SMI_EN + 1, 1);
- return 1;
- }
- return 0;
-}
-
-static int __init watchdog_init (void)
-{
- int ret;
-
- spin_lock_init(&tco_lock);
-
- /* Check whether or not the hardware watchdog is there */
- if (!i8xx_tco_getdevice () || i8xx_tco_pci == NULL)
- return -ENODEV;
-
- if (!request_region (TCOBASE, 0x10, "i8xx TCO")) {
- printk (KERN_ERR PFX "I/O address 0x%04x already in use\n",
- TCOBASE);
- ret = -EIO;
- goto out;
- }
-
- /* Clear out the (probably old) status */
- outb (0, TCO1_STS);
- outb (3, TCO2_STS);
-
- /* Check that the heartbeat value is within it's range ; if not reset to the default */
- if (tco_timer_set_heartbeat (heartbeat)) {
- heartbeat = WATCHDOG_HEARTBEAT;
- tco_timer_set_heartbeat (heartbeat);
- printk(KERN_INFO PFX "heartbeat value must be 2<heartbeat<39, using %d\n",
- heartbeat);
- }
-
- ret = register_reboot_notifier(&i8xx_tco_notifier);
- if (ret != 0) {
- printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
- ret);
- goto unreg_region;
- }
-
- ret = misc_register(&i8xx_tco_miscdev);
- if (ret != 0) {
- printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
- WATCHDOG_MINOR, ret);
- goto unreg_notifier;
- }
-
- tco_timer_stop ();
-
- printk (KERN_INFO PFX "initialized (0x%04x). heartbeat=%d sec (nowayout=%d)\n",
- TCOBASE, heartbeat, nowayout);
-
- return 0;
-
-unreg_notifier:
- unregister_reboot_notifier(&i8xx_tco_notifier);
-unreg_region:
- release_region (TCOBASE, 0x10);
-out:
- pci_dev_put(i8xx_tco_pci);
- return ret;
-}
-
-static void __exit watchdog_cleanup (void)
-{
- /* Stop the timer before we leave */
- if (!nowayout)
- tco_timer_stop ();
-
- /* Deregister */
- misc_deregister (&i8xx_tco_miscdev);
- unregister_reboot_notifier(&i8xx_tco_notifier);
- release_region (TCOBASE, 0x10);
-
- pci_dev_put(i8xx_tco_pci);
-}
-
-module_init(watchdog_init);
-module_exit(watchdog_cleanup);
-
-MODULE_AUTHOR("Nils Faerber");
-MODULE_DESCRIPTION("TCO timer driver for i8xx chipsets");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / commitdiff