550 строки
14 KiB
C
550 строки
14 KiB
C
/*
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* sch311x_wdt.c - Driver for the SCH311x Super-I/O chips
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* integrated watchdog.
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*
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* (c) Copyright 2008 Wim Van Sebroeck <wim@iguana.be>.
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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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* Includes, defines, variables, module parameters, ...
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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/* Includes */
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#include <linux/module.h> /* For module specific items */
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#include <linux/moduleparam.h> /* For new moduleparam's */
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#include <linux/types.h> /* For standard types (like size_t) */
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#include <linux/errno.h> /* For the -ENODEV/... values */
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#include <linux/kernel.h> /* For printk/... */
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#include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV
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(WATCHDOG_MINOR) */
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#include <linux/watchdog.h> /* For the watchdog specific items */
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#include <linux/init.h> /* For __init/__exit/... */
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#include <linux/fs.h> /* For file operations */
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#include <linux/platform_device.h> /* For platform_driver framework */
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#include <linux/ioport.h> /* For io-port access */
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#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */
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#include <linux/uaccess.h> /* For copy_to_user/put_user/... */
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#include <linux/io.h> /* For inb/outb/... */
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/* Module and version information */
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#define DRV_NAME "sch311x_wdt"
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/* Runtime registers */
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#define GP60 0x47
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#define WDT_TIME_OUT 0x65
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#define WDT_VAL 0x66
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#define WDT_CFG 0x67
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#define WDT_CTRL 0x68
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/* internal variables */
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static unsigned long sch311x_wdt_is_open;
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static char sch311x_wdt_expect_close;
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static struct platform_device *sch311x_wdt_pdev;
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static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e, 0x00 };
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static struct { /* The devices private data */
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/* the Runtime Register base address */
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unsigned short runtime_reg;
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/* The card's boot status */
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int boot_status;
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/* the lock for io operations */
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spinlock_t io_lock;
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} sch311x_wdt_data;
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/* Module load parameters */
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static unsigned short force_id;
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module_param(force_id, ushort, 0);
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MODULE_PARM_DESC(force_id, "Override the detected device ID");
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#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
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static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
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module_param(timeout, int, 0);
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MODULE_PARM_DESC(timeout,
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"Watchdog timeout in seconds. 1<= timeout <=15300, default="
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__MODULE_STRING(WATCHDOG_TIMEOUT) ".");
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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/*
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* Super-IO functions
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*/
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static inline void sch311x_sio_enter(int sio_config_port)
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{
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outb(0x55, sio_config_port);
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}
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static inline void sch311x_sio_exit(int sio_config_port)
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{
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outb(0xaa, sio_config_port);
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}
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static inline int sch311x_sio_inb(int sio_config_port, int reg)
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{
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outb(reg, sio_config_port);
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return inb(sio_config_port + 1);
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}
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static inline void sch311x_sio_outb(int sio_config_port, int reg, int val)
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{
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outb(reg, sio_config_port);
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outb(val, sio_config_port + 1);
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}
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/*
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* Watchdog Operations
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*/
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static void sch311x_wdt_set_timeout(int t)
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{
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unsigned char timeout_unit = 0x80;
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/* When new timeout is bigger then 255 seconds, we will use minutes */
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if (t > 255) {
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timeout_unit = 0;
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t /= 60;
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}
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/* -- Watchdog Timeout --
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* Bit 0-6 (Reserved)
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* Bit 7 WDT Time-out Value Units Select
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* (0 = Minutes, 1 = Seconds)
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*/
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outb(timeout_unit, sch311x_wdt_data.runtime_reg + WDT_TIME_OUT);
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/* -- Watchdog Timer Time-out Value --
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* Bit 0-7 Binary coded units (0=Disabled, 1..255)
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*/
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outb(t, sch311x_wdt_data.runtime_reg + WDT_VAL);
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}
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static void sch311x_wdt_start(void)
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{
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unsigned char t;
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spin_lock(&sch311x_wdt_data.io_lock);
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/* set watchdog's timeout */
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sch311x_wdt_set_timeout(timeout);
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/* enable the watchdog */
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/* -- General Purpose I/O Bit 6.0 --
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* Bit 0, In/Out: 0 = Output, 1 = Input
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* Bit 1, Polarity: 0 = No Invert, 1 = Invert
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* Bit 2-3, Function select: 00 = GPI/O, 01 = LED1, 11 = WDT,
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* 10 = Either Edge Triggered Intr.4
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* Bit 4-6 (Reserved)
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* Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain
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*/
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t = inb(sch311x_wdt_data.runtime_reg + GP60);
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outb((t & ~0x0d) | 0x0c, sch311x_wdt_data.runtime_reg + GP60);
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spin_unlock(&sch311x_wdt_data.io_lock);
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}
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static void sch311x_wdt_stop(void)
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{
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unsigned char t;
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spin_lock(&sch311x_wdt_data.io_lock);
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/* stop the watchdog */
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t = inb(sch311x_wdt_data.runtime_reg + GP60);
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outb((t & ~0x0d) | 0x01, sch311x_wdt_data.runtime_reg + GP60);
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/* disable timeout by setting it to 0 */
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sch311x_wdt_set_timeout(0);
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spin_unlock(&sch311x_wdt_data.io_lock);
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}
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static void sch311x_wdt_keepalive(void)
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{
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spin_lock(&sch311x_wdt_data.io_lock);
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sch311x_wdt_set_timeout(timeout);
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spin_unlock(&sch311x_wdt_data.io_lock);
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}
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static int sch311x_wdt_set_heartbeat(int t)
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{
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if (t < 1 || t > (255*60))
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return -EINVAL;
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/* When new timeout is bigger then 255 seconds,
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* we will round up to minutes (with a max of 255) */
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if (t > 255)
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t = (((t - 1) / 60) + 1) * 60;
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timeout = t;
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return 0;
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}
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static void sch311x_wdt_get_status(int *status)
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{
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unsigned char new_status;
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*status = 0;
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spin_lock(&sch311x_wdt_data.io_lock);
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/* -- Watchdog timer control --
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* Bit 0 Status Bit: 0 = Timer counting, 1 = Timeout occurred
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* Bit 1 Reserved
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* Bit 2 Force Timeout: 1 = Forces WD timeout event (self-cleaning)
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* Bit 3 P20 Force Timeout enabled:
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* 0 = P20 activity does not generate the WD timeout event
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* 1 = P20 Allows rising edge of P20, from the keyboard
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* controller, to force the WD timeout event.
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* Bit 4-7 Reserved
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*/
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new_status = inb(sch311x_wdt_data.runtime_reg + WDT_CTRL);
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if (new_status & 0x01)
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*status |= WDIOF_CARDRESET;
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spin_unlock(&sch311x_wdt_data.io_lock);
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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 sch311x_wdt_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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if (count) {
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if (!nowayout) {
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size_t i;
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sch311x_wdt_expect_close = 0;
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for (i = 0; i != count; i++) {
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char c;
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if (get_user(c, buf + i))
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return -EFAULT;
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if (c == 'V')
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sch311x_wdt_expect_close = 42;
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}
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}
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sch311x_wdt_keepalive();
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}
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return count;
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}
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static long sch311x_wdt_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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int status;
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int new_timeout;
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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static const struct watchdog_info ident = {
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.options = 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 = DRV_NAME,
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};
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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if (copy_to_user(argp, &ident, sizeof(ident)))
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return -EFAULT;
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break;
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case WDIOC_GETSTATUS:
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{
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sch311x_wdt_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(sch311x_wdt_data.boot_status, p);
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case WDIOC_SETOPTIONS:
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{
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int options, retval = -EINVAL;
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if (get_user(options, p))
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return -EFAULT;
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if (options & WDIOS_DISABLECARD) {
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sch311x_wdt_stop();
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retval = 0;
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}
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if (options & WDIOS_ENABLECARD) {
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sch311x_wdt_start();
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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_KEEPALIVE:
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sch311x_wdt_keepalive();
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break;
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case WDIOC_SETTIMEOUT:
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if (get_user(new_timeout, p))
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return -EFAULT;
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if (sch311x_wdt_set_heartbeat(new_timeout))
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return -EINVAL;
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sch311x_wdt_keepalive();
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/* Fall */
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case WDIOC_GETTIMEOUT:
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return put_user(timeout, p);
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default:
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return -ENOTTY;
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}
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return 0;
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}
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static int sch311x_wdt_open(struct inode *inode, struct file *file)
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{
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if (test_and_set_bit(0, &sch311x_wdt_is_open))
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return -EBUSY;
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/*
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* Activate
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*/
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sch311x_wdt_start();
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return nonseekable_open(inode, file);
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}
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static int sch311x_wdt_close(struct inode *inode, struct file *file)
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{
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if (sch311x_wdt_expect_close == 42) {
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sch311x_wdt_stop();
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} else {
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pr_crit("Unexpected close, not stopping watchdog!\n");
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sch311x_wdt_keepalive();
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}
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clear_bit(0, &sch311x_wdt_is_open);
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sch311x_wdt_expect_close = 0;
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return 0;
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}
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/*
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* Kernel Interfaces
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*/
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static const struct file_operations sch311x_wdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = sch311x_wdt_write,
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.unlocked_ioctl = sch311x_wdt_ioctl,
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.open = sch311x_wdt_open,
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.release = sch311x_wdt_close,
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};
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static struct miscdevice sch311x_wdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &sch311x_wdt_fops,
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};
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/*
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* Init & exit routines
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*/
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static int __devinit sch311x_wdt_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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int err;
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spin_lock_init(&sch311x_wdt_data.io_lock);
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if (!request_region(sch311x_wdt_data.runtime_reg + GP60, 1, DRV_NAME)) {
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dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
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sch311x_wdt_data.runtime_reg + GP60,
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sch311x_wdt_data.runtime_reg + GP60);
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err = -EBUSY;
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goto exit;
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}
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if (!request_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4,
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DRV_NAME)) {
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dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
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sch311x_wdt_data.runtime_reg + WDT_TIME_OUT,
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sch311x_wdt_data.runtime_reg + WDT_CTRL);
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err = -EBUSY;
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goto exit_release_region;
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}
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/* Make sure that the watchdog is not running */
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sch311x_wdt_stop();
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/* Disable keyboard and mouse interaction and interrupt */
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/* -- Watchdog timer configuration --
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* Bit 0 Reserved
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* Bit 1 Keyboard enable: 0* = No Reset, 1 = Reset WDT upon KBD Intr.
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* Bit 2 Mouse enable: 0* = No Reset, 1 = Reset WDT upon Mouse Intr
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* Bit 3 Reserved
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* Bit 4-7 WDT Interrupt Mapping: (0000* = Disabled,
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* 0001=IRQ1, 0010=(Invalid), 0011=IRQ3 to 1111=IRQ15)
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*/
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outb(0, sch311x_wdt_data.runtime_reg + WDT_CFG);
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/* Check that the heartbeat value is within it's range ;
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* if not reset to the default */
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if (sch311x_wdt_set_heartbeat(timeout)) {
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sch311x_wdt_set_heartbeat(WATCHDOG_TIMEOUT);
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dev_info(dev, "timeout value must be 1<=x<=15300, using %d\n",
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timeout);
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}
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/* Get status at boot */
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sch311x_wdt_get_status(&sch311x_wdt_data.boot_status);
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sch311x_wdt_miscdev.parent = dev;
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err = misc_register(&sch311x_wdt_miscdev);
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if (err != 0) {
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dev_err(dev, "cannot register miscdev on minor=%d (err=%d)\n",
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WATCHDOG_MINOR, err);
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goto exit_release_region2;
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}
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dev_info(dev,
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"SMSC SCH311x WDT initialized. timeout=%d sec (nowayout=%d)\n",
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timeout, nowayout);
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return 0;
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exit_release_region2:
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release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4);
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exit_release_region:
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release_region(sch311x_wdt_data.runtime_reg + GP60, 1);
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sch311x_wdt_data.runtime_reg = 0;
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exit:
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return err;
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}
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static int __devexit sch311x_wdt_remove(struct platform_device *pdev)
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{
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/* Stop the timer before we leave */
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if (!nowayout)
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sch311x_wdt_stop();
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/* Deregister */
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misc_deregister(&sch311x_wdt_miscdev);
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release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4);
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release_region(sch311x_wdt_data.runtime_reg + GP60, 1);
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sch311x_wdt_data.runtime_reg = 0;
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return 0;
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}
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static void sch311x_wdt_shutdown(struct platform_device *dev)
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{
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/* Turn the WDT off if we have a soft shutdown */
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sch311x_wdt_stop();
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}
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static struct platform_driver sch311x_wdt_driver = {
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.probe = sch311x_wdt_probe,
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.remove = __devexit_p(sch311x_wdt_remove),
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.shutdown = sch311x_wdt_shutdown,
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.driver = {
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.owner = THIS_MODULE,
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.name = DRV_NAME,
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},
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};
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static int __init sch311x_detect(int sio_config_port, unsigned short *addr)
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{
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int err = 0, reg;
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unsigned short base_addr;
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unsigned char dev_id;
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sch311x_sio_enter(sio_config_port);
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/* Check device ID. We currently know about:
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* SCH3112 (0x7c), SCH3114 (0x7d), and SCH3116 (0x7f). */
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reg = force_id ? force_id : sch311x_sio_inb(sio_config_port, 0x20);
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if (!(reg == 0x7c || reg == 0x7d || reg == 0x7f)) {
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err = -ENODEV;
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goto exit;
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}
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dev_id = reg == 0x7c ? 2 : reg == 0x7d ? 4 : 6;
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/* Select logical device A (runtime registers) */
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sch311x_sio_outb(sio_config_port, 0x07, 0x0a);
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/* Check if Logical Device Register is currently active */
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if ((sch311x_sio_inb(sio_config_port, 0x30) & 0x01) == 0)
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pr_info("Seems that LDN 0x0a is not active...\n");
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/* Get the base address of the runtime registers */
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base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) |
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sch311x_sio_inb(sio_config_port, 0x61);
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if (!base_addr) {
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pr_err("Base address not set\n");
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err = -ENODEV;
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goto exit;
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}
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*addr = base_addr;
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pr_info("Found an SMSC SCH311%d chip at 0x%04x\n", dev_id, base_addr);
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exit:
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sch311x_sio_exit(sio_config_port);
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return err;
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}
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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");
|
|
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
|
|