546 строки
14 KiB
C
546 строки
14 KiB
C
/*
|
|
* sch311x_wdt.c - Driver for the SCH311x Super-I/O chips
|
|
* integrated watchdog.
|
|
*
|
|
* (c) Copyright 2008 Wim Van Sebroeck <wim@iguana.be>.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* Includes, defines, variables, module parameters, ...
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
/* Includes */
|
|
#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/... */
|
|
#include <linux/miscdevice.h> /* For struct miscdevice */
|
|
#include <linux/watchdog.h> /* For the watchdog specific items */
|
|
#include <linux/init.h> /* For __init/__exit/... */
|
|
#include <linux/fs.h> /* For file operations */
|
|
#include <linux/platform_device.h> /* For platform_driver framework */
|
|
#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 DRV_NAME "sch311x_wdt"
|
|
|
|
/* Runtime registers */
|
|
#define GP60 0x47
|
|
#define WDT_TIME_OUT 0x65
|
|
#define WDT_VAL 0x66
|
|
#define WDT_CFG 0x67
|
|
#define WDT_CTRL 0x68
|
|
|
|
/* internal variables */
|
|
static unsigned long sch311x_wdt_is_open;
|
|
static char sch311x_wdt_expect_close;
|
|
static struct platform_device *sch311x_wdt_pdev;
|
|
|
|
static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e, 0x00 };
|
|
|
|
static struct { /* The devices private data */
|
|
/* the Runtime Register base address */
|
|
unsigned short runtime_reg;
|
|
/* The card's boot status */
|
|
int boot_status;
|
|
/* the lock for io operations */
|
|
spinlock_t io_lock;
|
|
} sch311x_wdt_data;
|
|
|
|
/* Module load parameters */
|
|
static unsigned short force_id;
|
|
module_param(force_id, ushort, 0);
|
|
MODULE_PARM_DESC(force_id, "Override the detected device ID");
|
|
|
|
#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
|
|
static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
|
|
module_param(timeout, int, 0);
|
|
MODULE_PARM_DESC(timeout,
|
|
"Watchdog timeout in seconds. 1<= timeout <=15300, default="
|
|
__MODULE_STRING(WATCHDOG_TIMEOUT) ".");
|
|
|
|
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) ")");
|
|
|
|
/*
|
|
* Super-IO functions
|
|
*/
|
|
|
|
static inline void sch311x_sio_enter(int sio_config_port)
|
|
{
|
|
outb(0x55, sio_config_port);
|
|
}
|
|
|
|
static inline void sch311x_sio_exit(int sio_config_port)
|
|
{
|
|
outb(0xaa, sio_config_port);
|
|
}
|
|
|
|
static inline int sch311x_sio_inb(int sio_config_port, int reg)
|
|
{
|
|
outb(reg, sio_config_port);
|
|
return inb(sio_config_port + 1);
|
|
}
|
|
|
|
static inline void sch311x_sio_outb(int sio_config_port, int reg, int val)
|
|
{
|
|
outb(reg, sio_config_port);
|
|
outb(val, sio_config_port + 1);
|
|
}
|
|
|
|
/*
|
|
* Watchdog Operations
|
|
*/
|
|
|
|
static void sch311x_wdt_set_timeout(int t)
|
|
{
|
|
unsigned char timeout_unit = 0x80;
|
|
|
|
/* When new timeout is bigger then 255 seconds, we will use minutes */
|
|
if (t > 255) {
|
|
timeout_unit = 0;
|
|
t /= 60;
|
|
}
|
|
|
|
/* -- Watchdog Timeout --
|
|
* Bit 0-6 (Reserved)
|
|
* Bit 7 WDT Time-out Value Units Select
|
|
* (0 = Minutes, 1 = Seconds)
|
|
*/
|
|
outb(timeout_unit, sch311x_wdt_data.runtime_reg + WDT_TIME_OUT);
|
|
|
|
/* -- Watchdog Timer Time-out Value --
|
|
* Bit 0-7 Binary coded units (0=Disabled, 1..255)
|
|
*/
|
|
outb(t, sch311x_wdt_data.runtime_reg + WDT_VAL);
|
|
}
|
|
|
|
static void sch311x_wdt_start(void)
|
|
{
|
|
unsigned char t;
|
|
|
|
spin_lock(&sch311x_wdt_data.io_lock);
|
|
|
|
/* set watchdog's timeout */
|
|
sch311x_wdt_set_timeout(timeout);
|
|
/* enable the watchdog */
|
|
/* -- General Purpose I/O Bit 6.0 --
|
|
* Bit 0, In/Out: 0 = Output, 1 = Input
|
|
* Bit 1, Polarity: 0 = No Invert, 1 = Invert
|
|
* Bit 2-3, Function select: 00 = GPI/O, 01 = LED1, 11 = WDT,
|
|
* 10 = Either Edge Triggered Intr.4
|
|
* Bit 4-6 (Reserved)
|
|
* Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain
|
|
*/
|
|
t = inb(sch311x_wdt_data.runtime_reg + GP60);
|
|
outb((t & ~0x0d) | 0x0c, sch311x_wdt_data.runtime_reg + GP60);
|
|
|
|
spin_unlock(&sch311x_wdt_data.io_lock);
|
|
|
|
}
|
|
|
|
static void sch311x_wdt_stop(void)
|
|
{
|
|
unsigned char t;
|
|
|
|
spin_lock(&sch311x_wdt_data.io_lock);
|
|
|
|
/* stop the watchdog */
|
|
t = inb(sch311x_wdt_data.runtime_reg + GP60);
|
|
outb((t & ~0x0d) | 0x01, sch311x_wdt_data.runtime_reg + GP60);
|
|
/* disable timeout by setting it to 0 */
|
|
sch311x_wdt_set_timeout(0);
|
|
|
|
spin_unlock(&sch311x_wdt_data.io_lock);
|
|
}
|
|
|
|
static void sch311x_wdt_keepalive(void)
|
|
{
|
|
spin_lock(&sch311x_wdt_data.io_lock);
|
|
sch311x_wdt_set_timeout(timeout);
|
|
spin_unlock(&sch311x_wdt_data.io_lock);
|
|
}
|
|
|
|
static int sch311x_wdt_set_heartbeat(int t)
|
|
{
|
|
if (t < 1 || t > (255*60))
|
|
return -EINVAL;
|
|
|
|
/* When new timeout is bigger then 255 seconds,
|
|
* we will round up to minutes (with a max of 255) */
|
|
if (t > 255)
|
|
t = (((t - 1) / 60) + 1) * 60;
|
|
|
|
timeout = t;
|
|
return 0;
|
|
}
|
|
|
|
static void sch311x_wdt_get_status(int *status)
|
|
{
|
|
unsigned char new_status;
|
|
|
|
*status = 0;
|
|
|
|
spin_lock(&sch311x_wdt_data.io_lock);
|
|
|
|
/* -- Watchdog timer control --
|
|
* Bit 0 Status Bit: 0 = Timer counting, 1 = Timeout occurred
|
|
* Bit 1 Reserved
|
|
* Bit 2 Force Timeout: 1 = Forces WD timeout event (self-cleaning)
|
|
* Bit 3 P20 Force Timeout enabled:
|
|
* 0 = P20 activity does not generate the WD timeout event
|
|
* 1 = P20 Allows rising edge of P20, from the keyboard
|
|
* controller, to force the WD timeout event.
|
|
* Bit 4-7 Reserved
|
|
*/
|
|
new_status = inb(sch311x_wdt_data.runtime_reg + WDT_CTRL);
|
|
if (new_status & 0x01)
|
|
*status |= WDIOF_CARDRESET;
|
|
|
|
spin_unlock(&sch311x_wdt_data.io_lock);
|
|
}
|
|
|
|
/*
|
|
* /dev/watchdog handling
|
|
*/
|
|
|
|
static ssize_t sch311x_wdt_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
if (count) {
|
|
if (!nowayout) {
|
|
size_t i;
|
|
|
|
sch311x_wdt_expect_close = 0;
|
|
|
|
for (i = 0; i != count; i++) {
|
|
char c;
|
|
if (get_user(c, buf + i))
|
|
return -EFAULT;
|
|
if (c == 'V')
|
|
sch311x_wdt_expect_close = 42;
|
|
}
|
|
}
|
|
sch311x_wdt_keepalive();
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static long sch311x_wdt_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
int status;
|
|
int new_timeout;
|
|
void __user *argp = (void __user *)arg;
|
|
int __user *p = argp;
|
|
static const struct watchdog_info ident = {
|
|
.options = WDIOF_KEEPALIVEPING |
|
|
WDIOF_SETTIMEOUT |
|
|
WDIOF_MAGICCLOSE,
|
|
.firmware_version = 1,
|
|
.identity = DRV_NAME,
|
|
};
|
|
|
|
switch (cmd) {
|
|
case WDIOC_GETSUPPORT:
|
|
if (copy_to_user(argp, &ident, sizeof(ident)))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case WDIOC_GETSTATUS:
|
|
{
|
|
sch311x_wdt_get_status(&status);
|
|
return put_user(status, p);
|
|
}
|
|
case WDIOC_GETBOOTSTATUS:
|
|
return put_user(sch311x_wdt_data.boot_status, p);
|
|
|
|
case WDIOC_SETOPTIONS:
|
|
{
|
|
int options, retval = -EINVAL;
|
|
|
|
if (get_user(options, p))
|
|
return -EFAULT;
|
|
if (options & WDIOS_DISABLECARD) {
|
|
sch311x_wdt_stop();
|
|
retval = 0;
|
|
}
|
|
if (options & WDIOS_ENABLECARD) {
|
|
sch311x_wdt_start();
|
|
retval = 0;
|
|
}
|
|
return retval;
|
|
}
|
|
case WDIOC_KEEPALIVE:
|
|
sch311x_wdt_keepalive();
|
|
break;
|
|
|
|
case WDIOC_SETTIMEOUT:
|
|
if (get_user(new_timeout, p))
|
|
return -EFAULT;
|
|
if (sch311x_wdt_set_heartbeat(new_timeout))
|
|
return -EINVAL;
|
|
sch311x_wdt_keepalive();
|
|
/* Fall through */
|
|
case WDIOC_GETTIMEOUT:
|
|
return put_user(timeout, p);
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int sch311x_wdt_open(struct inode *inode, struct file *file)
|
|
{
|
|
if (test_and_set_bit(0, &sch311x_wdt_is_open))
|
|
return -EBUSY;
|
|
/*
|
|
* Activate
|
|
*/
|
|
sch311x_wdt_start();
|
|
return stream_open(inode, file);
|
|
}
|
|
|
|
static int sch311x_wdt_close(struct inode *inode, struct file *file)
|
|
{
|
|
if (sch311x_wdt_expect_close == 42) {
|
|
sch311x_wdt_stop();
|
|
} else {
|
|
pr_crit("Unexpected close, not stopping watchdog!\n");
|
|
sch311x_wdt_keepalive();
|
|
}
|
|
clear_bit(0, &sch311x_wdt_is_open);
|
|
sch311x_wdt_expect_close = 0;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Kernel Interfaces
|
|
*/
|
|
|
|
static const struct file_operations sch311x_wdt_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.write = sch311x_wdt_write,
|
|
.unlocked_ioctl = sch311x_wdt_ioctl,
|
|
.open = sch311x_wdt_open,
|
|
.release = sch311x_wdt_close,
|
|
};
|
|
|
|
static struct miscdevice sch311x_wdt_miscdev = {
|
|
.minor = WATCHDOG_MINOR,
|
|
.name = "watchdog",
|
|
.fops = &sch311x_wdt_fops,
|
|
};
|
|
|
|
/*
|
|
* Init & exit routines
|
|
*/
|
|
|
|
static int sch311x_wdt_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
int err;
|
|
|
|
spin_lock_init(&sch311x_wdt_data.io_lock);
|
|
|
|
if (!request_region(sch311x_wdt_data.runtime_reg + GP60, 1, DRV_NAME)) {
|
|
dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
|
|
sch311x_wdt_data.runtime_reg + GP60,
|
|
sch311x_wdt_data.runtime_reg + GP60);
|
|
err = -EBUSY;
|
|
goto exit;
|
|
}
|
|
|
|
if (!request_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4,
|
|
DRV_NAME)) {
|
|
dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
|
|
sch311x_wdt_data.runtime_reg + WDT_TIME_OUT,
|
|
sch311x_wdt_data.runtime_reg + WDT_CTRL);
|
|
err = -EBUSY;
|
|
goto exit_release_region;
|
|
}
|
|
|
|
/* Make sure that the watchdog is not running */
|
|
sch311x_wdt_stop();
|
|
|
|
/* Disable keyboard and mouse interaction and interrupt */
|
|
/* -- Watchdog timer configuration --
|
|
* Bit 0 Reserved
|
|
* Bit 1 Keyboard enable: 0* = No Reset, 1 = Reset WDT upon KBD Intr.
|
|
* Bit 2 Mouse enable: 0* = No Reset, 1 = Reset WDT upon Mouse Intr
|
|
* Bit 3 Reserved
|
|
* Bit 4-7 WDT Interrupt Mapping: (0000* = Disabled,
|
|
* 0001=IRQ1, 0010=(Invalid), 0011=IRQ3 to 1111=IRQ15)
|
|
*/
|
|
outb(0, sch311x_wdt_data.runtime_reg + WDT_CFG);
|
|
|
|
/* Check that the heartbeat value is within it's range ;
|
|
* if not reset to the default */
|
|
if (sch311x_wdt_set_heartbeat(timeout)) {
|
|
sch311x_wdt_set_heartbeat(WATCHDOG_TIMEOUT);
|
|
dev_info(dev, "timeout value must be 1<=x<=15300, using %d\n",
|
|
timeout);
|
|
}
|
|
|
|
/* Get status at boot */
|
|
sch311x_wdt_get_status(&sch311x_wdt_data.boot_status);
|
|
|
|
sch311x_wdt_miscdev.parent = dev;
|
|
|
|
err = misc_register(&sch311x_wdt_miscdev);
|
|
if (err != 0) {
|
|
dev_err(dev, "cannot register miscdev on minor=%d (err=%d)\n",
|
|
WATCHDOG_MINOR, err);
|
|
goto exit_release_region2;
|
|
}
|
|
|
|
dev_info(dev,
|
|
"SMSC SCH311x WDT initialized. timeout=%d sec (nowayout=%d)\n",
|
|
timeout, nowayout);
|
|
|
|
return 0;
|
|
|
|
exit_release_region2:
|
|
release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4);
|
|
exit_release_region:
|
|
release_region(sch311x_wdt_data.runtime_reg + GP60, 1);
|
|
sch311x_wdt_data.runtime_reg = 0;
|
|
exit:
|
|
return err;
|
|
}
|
|
|
|
static int sch311x_wdt_remove(struct platform_device *pdev)
|
|
{
|
|
/* Stop the timer before we leave */
|
|
if (!nowayout)
|
|
sch311x_wdt_stop();
|
|
|
|
/* Deregister */
|
|
misc_deregister(&sch311x_wdt_miscdev);
|
|
release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4);
|
|
release_region(sch311x_wdt_data.runtime_reg + GP60, 1);
|
|
sch311x_wdt_data.runtime_reg = 0;
|
|
return 0;
|
|
}
|
|
|
|
static void sch311x_wdt_shutdown(struct platform_device *dev)
|
|
{
|
|
/* Turn the WDT off if we have a soft shutdown */
|
|
sch311x_wdt_stop();
|
|
}
|
|
|
|
static struct platform_driver sch311x_wdt_driver = {
|
|
.probe = sch311x_wdt_probe,
|
|
.remove = sch311x_wdt_remove,
|
|
.shutdown = sch311x_wdt_shutdown,
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
},
|
|
};
|
|
|
|
static int __init sch311x_detect(int sio_config_port, unsigned short *addr)
|
|
{
|
|
int err = 0, reg;
|
|
unsigned short base_addr;
|
|
unsigned char dev_id;
|
|
|
|
sch311x_sio_enter(sio_config_port);
|
|
|
|
/* Check device ID. We currently know about:
|
|
* SCH3112 (0x7c), SCH3114 (0x7d), and SCH3116 (0x7f). */
|
|
reg = force_id ? force_id : sch311x_sio_inb(sio_config_port, 0x20);
|
|
if (!(reg == 0x7c || reg == 0x7d || reg == 0x7f)) {
|
|
err = -ENODEV;
|
|
goto exit;
|
|
}
|
|
dev_id = reg == 0x7c ? 2 : reg == 0x7d ? 4 : 6;
|
|
|
|
/* Select logical device A (runtime registers) */
|
|
sch311x_sio_outb(sio_config_port, 0x07, 0x0a);
|
|
|
|
/* Check if Logical Device Register is currently active */
|
|
if ((sch311x_sio_inb(sio_config_port, 0x30) & 0x01) == 0)
|
|
pr_info("Seems that LDN 0x0a is not active...\n");
|
|
|
|
/* Get the base address of the runtime registers */
|
|
base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) |
|
|
sch311x_sio_inb(sio_config_port, 0x61);
|
|
if (!base_addr) {
|
|
pr_err("Base address not set\n");
|
|
err = -ENODEV;
|
|
goto exit;
|
|
}
|
|
*addr = base_addr;
|
|
|
|
pr_info("Found an SMSC SCH311%d chip at 0x%04x\n", dev_id, base_addr);
|
|
|
|
exit:
|
|
sch311x_sio_exit(sio_config_port);
|
|
return err;
|
|
}
|
|
|
|
static int __init sch311x_wdt_init(void)
|
|
{
|
|
int err, i, found = 0;
|
|
unsigned short addr = 0;
|
|
|
|
for (i = 0; !found && sch311x_ioports[i]; i++)
|
|
if (sch311x_detect(sch311x_ioports[i], &addr) == 0)
|
|
found++;
|
|
|
|
if (!found)
|
|
return -ENODEV;
|
|
|
|
sch311x_wdt_data.runtime_reg = addr;
|
|
|
|
err = platform_driver_register(&sch311x_wdt_driver);
|
|
if (err)
|
|
return err;
|
|
|
|
sch311x_wdt_pdev = platform_device_register_simple(DRV_NAME, addr,
|
|
NULL, 0);
|
|
|
|
if (IS_ERR(sch311x_wdt_pdev)) {
|
|
err = PTR_ERR(sch311x_wdt_pdev);
|
|
goto unreg_platform_driver;
|
|
}
|
|
|
|
return 0;
|
|
|
|
unreg_platform_driver:
|
|
platform_driver_unregister(&sch311x_wdt_driver);
|
|
return err;
|
|
}
|
|
|
|
static void __exit sch311x_wdt_exit(void)
|
|
{
|
|
platform_device_unregister(sch311x_wdt_pdev);
|
|
platform_driver_unregister(&sch311x_wdt_driver);
|
|
}
|
|
|
|
module_init(sch311x_wdt_init);
|
|
module_exit(sch311x_wdt_exit);
|
|
|
|
MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
|
|
MODULE_DESCRIPTION("SMSC SCH311x WatchDog Timer Driver");
|
|
MODULE_LICENSE("GPL");
|