2006-08-24 09:11:50 -06:00
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/*
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* NS pc87413-wdt Watchdog Timer driver for Linux 2.6.x.x
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*
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2006-10-16 10:18:09 -06:00
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* This code is based on wdt.c with original copyright.
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2006-08-24 09:11:50 -06:00
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*
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2006-10-16 10:18:09 -06:00
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* (C) Copyright 2006 Sven Anders, <anders@anduras.de>
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* and Marcus Junker, <junker@anduras.de>
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2006-08-24 09:11:50 -06:00
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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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2006-10-16 10:18:09 -06:00
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* Neither Sven Anders, Marcus Junker nor ANDURAS AG
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2006-08-24 09:11:50 -06:00
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* admit liability nor provide warranty for any of this software.
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* This material is provided "AS-IS" and at no charge.
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*
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2006-10-16 10:18:09 -06:00
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* Release 1.1
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2006-08-24 09:11:50 -06:00
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*/
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2012-02-15 16:06:19 -07:00
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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2006-08-24 09:11:50 -06:00
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/notifier.h>
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#include <linux/fs.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <linux/moduleparam.h>
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2008-05-19 07:07:37 -06:00
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#include <linux/io.h>
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#include <linux/uaccess.h>
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2006-08-24 09:11:50 -06:00
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2006-10-16 10:18:09 -06:00
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/* #define DEBUG 1 */
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2006-08-24 09:11:50 -06:00
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2008-08-06 14:19:41 -06:00
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#define DEFAULT_TIMEOUT 1 /* 1 minute */
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2006-10-16 10:18:09 -06:00
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#define MAX_TIMEOUT 255
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2006-08-24 09:11:50 -06:00
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2006-10-16 10:18:09 -06:00
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#define VERSION "1.1"
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#define MODNAME "pc87413 WDT"
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#define DPFX MODNAME " - DEBUG: "
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2006-08-24 09:11:50 -06:00
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2008-08-06 14:19:41 -06:00
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#define WDT_INDEX_IO_PORT (io+0) /* I/O port base (index register) */
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2006-10-16 10:18:09 -06:00
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#define WDT_DATA_IO_PORT (WDT_INDEX_IO_PORT+1)
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#define SWC_LDN 0x04
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2008-08-06 14:19:41 -06:00
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#define SIOCFG2 0x22 /* Serial IO register */
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2011-03-30 19:57:33 -06:00
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#define WDCTL 0x10 /* Watchdog-Timer-Control-Register */
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2008-08-06 14:19:41 -06:00
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#define WDTO 0x11 /* Watchdog timeout register */
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#define WDCFG 0x12 /* Watchdog config register */
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2006-08-24 09:11:50 -06:00
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2010-05-01 10:46:15 -06:00
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#define IO_DEFAULT 0x2E /* Address used on Portwell Boards */
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static int io = IO_DEFAULT;
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2011-04-14 13:02:39 -06:00
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static int swc_base_addr = -1;
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2006-08-24 09:11:50 -06:00
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2008-08-06 14:19:41 -06:00
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static int timeout = DEFAULT_TIMEOUT; /* timeout value */
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2008-05-19 07:07:37 -06:00
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static unsigned long timer_enabled; /* is the timer enabled? */
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2006-08-24 09:11:50 -06:00
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2008-05-19 07:07:37 -06:00
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static char expect_close; /* is the close expected? */
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2006-08-24 09:11:50 -06:00
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2008-05-19 07:07:37 -06:00
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static DEFINE_SPINLOCK(io_lock); /* to guard us from io races */
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2006-08-24 09:11:50 -06:00
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2012-03-05 08:51:11 -07:00
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static bool nowayout = WATCHDOG_NOWAYOUT;
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2006-08-24 09:11:50 -06:00
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2006-10-16 10:18:09 -06:00
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/* -- Low level function ----------------------------------------*/
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2006-08-24 09:11:50 -06:00
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2006-10-16 10:18:09 -06:00
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/* Select pins for Watchdog output */
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2006-08-24 09:11:50 -06:00
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2008-05-19 07:07:37 -06:00
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static inline void pc87413_select_wdt_out(void)
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2006-08-24 09:11:50 -06:00
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{
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2006-10-16 10:18:09 -06:00
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unsigned int cr_data = 0;
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2006-08-24 09:11:50 -06:00
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2006-10-16 10:18:09 -06:00
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/* Step 1: Select multiple pin,pin55,as WDT output */
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2006-08-24 09:11:50 -06:00
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outb_p(SIOCFG2, WDT_INDEX_IO_PORT);
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2008-05-19 07:07:37 -06:00
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cr_data = inb(WDT_DATA_IO_PORT);
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2006-08-24 09:11:50 -06:00
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cr_data |= 0x80; /* Set Bit7 to 1*/
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outb_p(SIOCFG2, WDT_INDEX_IO_PORT);
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outb_p(cr_data, WDT_DATA_IO_PORT);
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2006-10-16 10:18:09 -06:00
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#ifdef DEBUG
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2012-02-15 16:06:19 -07:00
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pr_info(DPFX
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2008-05-19 07:07:37 -06:00
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"Select multiple pin,pin55,as WDT output: Bit7 to 1: %d\n",
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cr_data);
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2006-10-16 10:18:09 -06:00
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#endif
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2006-08-24 09:11:50 -06:00
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}
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2006-10-16 10:18:09 -06:00
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/* Enable SWC functions */
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2006-08-24 09:11:50 -06:00
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2006-10-16 10:18:09 -06:00
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static inline void pc87413_enable_swc(void)
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{
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2008-05-19 07:07:37 -06:00
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unsigned int cr_data = 0;
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2006-08-24 09:11:50 -06:00
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/* Step 2: Enable SWC functions */
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2008-08-06 14:19:41 -06:00
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outb_p(0x07, WDT_INDEX_IO_PORT); /* Point SWC_LDN (LDN=4) */
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2006-08-24 09:11:50 -06:00
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outb_p(SWC_LDN, WDT_DATA_IO_PORT);
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2008-08-06 14:19:41 -06:00
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outb_p(0x30, WDT_INDEX_IO_PORT); /* Read Index 0x30 First */
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2006-10-16 10:18:09 -06:00
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cr_data = inb(WDT_DATA_IO_PORT);
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2008-08-06 14:19:41 -06:00
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cr_data |= 0x01; /* Set Bit0 to 1 */
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2006-08-24 09:11:50 -06:00
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outb_p(0x30, WDT_INDEX_IO_PORT);
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2008-08-06 14:19:41 -06:00
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outb_p(cr_data, WDT_DATA_IO_PORT); /* Index0x30_bit0P1 */
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2006-08-24 09:11:50 -06:00
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2006-10-16 10:18:09 -06:00
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#ifdef DEBUG
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2012-02-15 16:06:19 -07:00
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pr_info(DPFX "pc87413 - Enable SWC functions\n");
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2006-10-16 10:18:09 -06:00
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#endif
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2006-08-24 09:11:50 -06:00
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}
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2006-10-16 10:18:09 -06:00
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/* Read SWC I/O base address */
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2011-04-14 13:02:39 -06:00
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static void pc87413_get_swc_base_addr(void)
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2006-08-24 09:11:50 -06:00
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{
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2006-10-16 10:18:09 -06:00
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unsigned char addr_l, addr_h = 0;
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2006-08-24 09:11:50 -06:00
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/* Step 3: Read SWC I/O Base Address */
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2008-08-06 14:19:41 -06:00
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outb_p(0x60, WDT_INDEX_IO_PORT); /* Read Index 0x60 */
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2006-10-16 10:18:09 -06:00
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addr_h = inb(WDT_DATA_IO_PORT);
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2006-08-24 09:11:50 -06:00
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2008-08-06 14:19:41 -06:00
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outb_p(0x61, WDT_INDEX_IO_PORT); /* Read Index 0x61 */
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2006-08-24 09:11:50 -06:00
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2006-10-16 10:18:09 -06:00
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addr_l = inb(WDT_DATA_IO_PORT);
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2006-08-24 09:11:50 -06:00
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swc_base_addr = (addr_h << 8) + addr_l;
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2006-10-16 10:18:09 -06:00
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#ifdef DEBUG
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2012-02-15 16:06:19 -07:00
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pr_info(DPFX
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2008-05-19 07:07:37 -06:00
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"Read SWC I/O Base Address: low %d, high %d, res %d\n",
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addr_l, addr_h, swc_base_addr);
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2006-10-16 10:18:09 -06:00
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#endif
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2006-08-24 09:11:50 -06:00
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}
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2006-10-16 10:18:09 -06:00
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/* Select Bank 3 of SWC */
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2011-04-14 13:02:39 -06:00
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static inline void pc87413_swc_bank3(void)
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2006-08-24 09:11:50 -06:00
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{
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/* Step 4: Select Bank3 of SWC */
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2006-10-16 10:18:09 -06:00
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outb_p(inb(swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f);
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#ifdef DEBUG
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2012-02-15 16:06:19 -07:00
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pr_info(DPFX "Select Bank3 of SWC\n");
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2006-10-16 10:18:09 -06:00
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#endif
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2006-08-24 09:11:50 -06:00
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}
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2006-10-16 10:18:09 -06:00
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/* Set watchdog timeout to x minutes */
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2011-04-14 13:02:39 -06:00
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static inline void pc87413_programm_wdto(char pc87413_time)
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2006-08-24 09:11:50 -06:00
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{
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/* Step 5: Programm WDTO, Twd. */
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2006-10-16 10:18:09 -06:00
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outb_p(pc87413_time, swc_base_addr + WDTO);
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#ifdef DEBUG
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2012-02-15 16:06:19 -07:00
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pr_info(DPFX "Set WDTO to %d minutes\n", pc87413_time);
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2006-10-16 10:18:09 -06:00
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#endif
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2006-08-24 09:11:50 -06:00
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}
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2006-10-16 10:18:09 -06:00
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/* Enable WDEN */
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2011-04-14 13:02:39 -06:00
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static inline void pc87413_enable_wden(void)
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2006-08-24 09:11:50 -06:00
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{
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/* Step 6: Enable WDEN */
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2008-05-19 07:07:37 -06:00
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outb_p(inb(swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL);
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2006-10-16 10:18:09 -06:00
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#ifdef DEBUG
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2012-02-15 16:06:19 -07:00
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pr_info(DPFX "Enable WDEN\n");
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2006-10-16 10:18:09 -06:00
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#endif
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2006-08-24 09:11:50 -06:00
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}
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2006-10-16 10:18:09 -06:00
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/* Enable SW_WD_TREN */
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2011-04-14 13:02:39 -06:00
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static inline void pc87413_enable_sw_wd_tren(void)
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2006-08-24 09:11:50 -06:00
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{
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/* Enable SW_WD_TREN */
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2008-05-19 07:07:37 -06:00
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outb_p(inb(swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG);
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2006-10-16 10:18:09 -06:00
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#ifdef DEBUG
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2012-02-15 16:06:19 -07:00
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pr_info(DPFX "Enable SW_WD_TREN\n");
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2006-10-16 10:18:09 -06:00
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#endif
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2006-08-24 09:11:50 -06:00
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}
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2006-10-16 10:18:09 -06:00
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/* Disable SW_WD_TREN */
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2011-04-14 13:02:39 -06:00
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static inline void pc87413_disable_sw_wd_tren(void)
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2006-08-24 09:11:50 -06:00
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{
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/* Disable SW_WD_TREN */
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2008-05-19 07:07:37 -06:00
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outb_p(inb(swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG);
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2006-10-16 10:18:09 -06:00
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#ifdef DEBUG
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2012-02-15 16:06:19 -07:00
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pr_info(DPFX "pc87413 - Disable SW_WD_TREN\n");
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2006-10-16 10:18:09 -06:00
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#endif
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2006-08-24 09:11:50 -06:00
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}
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2006-10-16 10:18:09 -06:00
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/* Enable SW_WD_TRG */
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2006-08-24 09:11:50 -06:00
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2011-04-14 13:02:39 -06:00
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static inline void pc87413_enable_sw_wd_trg(void)
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2006-08-24 09:11:50 -06:00
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{
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/* Enable SW_WD_TRG */
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2008-05-19 07:07:37 -06:00
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outb_p(inb(swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL);
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2006-10-16 10:18:09 -06:00
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#ifdef DEBUG
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2012-02-15 16:06:19 -07:00
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pr_info(DPFX "pc87413 - Enable SW_WD_TRG\n");
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2006-10-16 10:18:09 -06:00
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#endif
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2006-08-24 09:11:50 -06:00
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}
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2006-10-16 10:18:09 -06:00
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/* Disable SW_WD_TRG */
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2006-08-24 09:11:50 -06:00
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2011-04-14 13:02:39 -06:00
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static inline void pc87413_disable_sw_wd_trg(void)
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2006-10-16 10:18:09 -06:00
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{
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2006-08-24 09:11:50 -06:00
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/* Disable SW_WD_TRG */
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2008-05-19 07:07:37 -06:00
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outb_p(inb(swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL);
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2006-10-16 10:18:09 -06:00
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#ifdef DEBUG
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2012-02-15 16:06:19 -07:00
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pr_info(DPFX "Disable SW_WD_TRG\n");
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2006-10-16 10:18:09 -06:00
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#endif
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2006-08-24 09:11:50 -06:00
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}
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2006-10-16 10:18:09 -06:00
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/* -- Higher level functions ------------------------------------*/
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2006-08-24 09:11:50 -06:00
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2006-10-16 10:18:09 -06:00
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/* Enable the watchdog */
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2006-08-24 09:11:50 -06:00
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2006-10-16 10:18:09 -06:00
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static void pc87413_enable(void)
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2006-08-24 09:11:50 -06:00
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{
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2006-10-16 10:18:09 -06:00
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spin_lock(&io_lock);
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2006-08-24 09:11:50 -06:00
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2011-04-14 13:02:39 -06:00
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pc87413_swc_bank3();
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pc87413_programm_wdto(timeout);
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pc87413_enable_wden();
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pc87413_enable_sw_wd_tren();
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pc87413_enable_sw_wd_trg();
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2006-10-16 10:18:09 -06:00
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spin_unlock(&io_lock);
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2006-08-24 09:11:50 -06:00
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}
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2006-10-16 10:18:09 -06:00
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/* Disable the watchdog */
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2006-08-24 09:11:50 -06:00
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2006-10-16 10:18:09 -06:00
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static void pc87413_disable(void)
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2006-08-24 09:11:50 -06:00
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{
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2006-10-16 10:18:09 -06:00
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spin_lock(&io_lock);
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2006-08-24 09:11:50 -06:00
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2011-04-14 13:02:39 -06:00
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pc87413_swc_bank3();
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pc87413_disable_sw_wd_tren();
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pc87413_disable_sw_wd_trg();
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pc87413_programm_wdto(0);
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2006-10-16 10:18:09 -06:00
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spin_unlock(&io_lock);
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2006-08-24 09:11:50 -06:00
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}
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2006-10-16 10:18:09 -06:00
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/* Refresh the watchdog */
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2006-08-24 09:11:50 -06:00
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2006-10-16 10:18:09 -06:00
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static void pc87413_refresh(void)
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2006-08-24 09:11:50 -06:00
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{
|
2006-10-16 10:18:09 -06:00
|
|
|
spin_lock(&io_lock);
|
2006-08-24 09:11:50 -06:00
|
|
|
|
2011-04-14 13:02:39 -06:00
|
|
|
pc87413_swc_bank3();
|
|
|
|
pc87413_disable_sw_wd_tren();
|
|
|
|
pc87413_disable_sw_wd_trg();
|
|
|
|
pc87413_programm_wdto(timeout);
|
|
|
|
pc87413_enable_wden();
|
|
|
|
pc87413_enable_sw_wd_tren();
|
|
|
|
pc87413_enable_sw_wd_trg();
|
2006-08-24 09:11:50 -06:00
|
|
|
|
2006-10-16 10:18:09 -06:00
|
|
|
spin_unlock(&io_lock);
|
2006-08-24 09:11:50 -06:00
|
|
|
}
|
|
|
|
|
2006-10-16 10:18:09 -06:00
|
|
|
/* -- File operations -------------------------------------------*/
|
|
|
|
|
|
|
|
/**
|
|
|
|
* pc87413_open:
|
|
|
|
* @inode: inode of device
|
|
|
|
* @file: file handle to device
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
static int pc87413_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
/* /dev/watchdog can only be opened once */
|
|
|
|
|
|
|
|
if (test_and_set_bit(0, &timer_enabled))
|
|
|
|
return -EBUSY;
|
|
|
|
|
|
|
|
if (nowayout)
|
|
|
|
__module_get(THIS_MODULE);
|
2006-08-24 09:11:50 -06:00
|
|
|
|
2006-10-16 10:18:09 -06:00
|
|
|
/* Reload and activate timer */
|
|
|
|
pc87413_refresh();
|
2006-08-24 09:11:50 -06:00
|
|
|
|
2012-02-15 16:06:19 -07:00
|
|
|
pr_info("Watchdog enabled. Timeout set to %d minute(s).\n", timeout);
|
2006-10-16 10:18:09 -06:00
|
|
|
|
|
|
|
return nonseekable_open(inode, file);
|
|
|
|
}
|
2006-08-24 09:11:50 -06:00
|
|
|
|
|
|
|
/**
|
2006-10-16 10:18:09 -06:00
|
|
|
* pc87413_release:
|
|
|
|
* @inode: inode to board
|
|
|
|
* @file: file handle to board
|
2006-08-24 09:11:50 -06:00
|
|
|
*
|
2006-10-16 10:18:09 -06:00
|
|
|
* The watchdog has a configurable API. There is a religious dispute
|
|
|
|
* between people who want their watchdog to be able to shut down and
|
|
|
|
* those who want to be sure if the watchdog manager dies the machine
|
|
|
|
* reboots. In the former case we disable the counters, in the latter
|
|
|
|
* case you have to open it again very soon.
|
2006-08-24 09:11:50 -06:00
|
|
|
*/
|
|
|
|
|
2006-10-16 10:18:09 -06:00
|
|
|
static int pc87413_release(struct inode *inode, struct file *file)
|
2006-08-24 09:11:50 -06:00
|
|
|
{
|
2006-10-16 10:18:09 -06:00
|
|
|
/* Shut off the timer. */
|
|
|
|
|
|
|
|
if (expect_close == 42) {
|
|
|
|
pc87413_disable();
|
2012-02-15 16:06:19 -07:00
|
|
|
pr_info("Watchdog disabled, sleeping again...\n");
|
2006-10-16 10:18:09 -06:00
|
|
|
} else {
|
2012-02-15 16:06:19 -07:00
|
|
|
pr_crit("Unexpected close, not stopping watchdog!\n");
|
2006-10-16 10:18:09 -06:00
|
|
|
pc87413_refresh();
|
|
|
|
}
|
|
|
|
clear_bit(0, &timer_enabled);
|
|
|
|
expect_close = 0;
|
|
|
|
return 0;
|
2006-08-24 09:11:50 -06:00
|
|
|
}
|
|
|
|
|
2006-10-16 10:18:09 -06:00
|
|
|
/**
|
|
|
|
* pc87413_status:
|
|
|
|
*
|
|
|
|
* return, if the watchdog is enabled (timeout is set...)
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
|
static int pc87413_status(void)
|
2006-08-24 09:11:50 -06:00
|
|
|
{
|
2006-10-23 10:21:52 -06:00
|
|
|
return 0; /* currently not supported */
|
2006-08-24 09:11:50 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* pc87413_write:
|
|
|
|
* @file: file handle to the watchdog
|
2006-10-16 10:18:09 -06:00
|
|
|
* @data: data buffer to write
|
|
|
|
* @len: length in bytes
|
2006-08-24 09:11:50 -06:00
|
|
|
* @ppos: pointer to the position to write. No seeks allowed
|
|
|
|
*
|
|
|
|
* A write to a watchdog device is defined as a keepalive signal. Any
|
|
|
|
* write of data will do, as we we don't define content meaning.
|
|
|
|
*/
|
|
|
|
|
2006-10-16 10:18:09 -06:00
|
|
|
static ssize_t pc87413_write(struct file *file, const char __user *data,
|
|
|
|
size_t len, loff_t *ppos)
|
2006-08-24 09:11:50 -06:00
|
|
|
{
|
2006-10-16 10:18:09 -06:00
|
|
|
/* See if we got the magic character 'V' and reload the timer */
|
|
|
|
if (len) {
|
|
|
|
if (!nowayout) {
|
|
|
|
size_t i;
|
|
|
|
|
|
|
|
/* reset expect flag */
|
|
|
|
expect_close = 0;
|
|
|
|
|
2008-05-19 07:07:37 -06:00
|
|
|
/* scan to see whether or not we got the
|
|
|
|
magic character */
|
2006-10-16 10:18:09 -06:00
|
|
|
for (i = 0; i != len; i++) {
|
|
|
|
char c;
|
2008-08-06 14:19:41 -06:00
|
|
|
if (get_user(c, data + i))
|
2006-10-16 10:18:09 -06:00
|
|
|
return -EFAULT;
|
|
|
|
if (c == 'V')
|
|
|
|
expect_close = 42;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* someone wrote to us, we should reload the timer */
|
|
|
|
pc87413_refresh();
|
2006-08-24 09:11:50 -06:00
|
|
|
}
|
2006-10-16 10:18:09 -06:00
|
|
|
return len;
|
2006-08-24 09:11:50 -06:00
|
|
|
}
|
|
|
|
|
2006-10-16 10:18:09 -06:00
|
|
|
/**
|
2006-08-24 09:11:50 -06:00
|
|
|
* pc87413_ioctl:
|
|
|
|
* @file: file handle to the device
|
|
|
|
* @cmd: watchdog command
|
|
|
|
* @arg: argument pointer
|
|
|
|
*
|
|
|
|
* The watchdog API defines a common set of functions for all watchdogs
|
|
|
|
* according to their available features. We only actually usefully support
|
|
|
|
* querying capabilities and current status.
|
|
|
|
*/
|
|
|
|
|
2008-05-19 07:07:37 -06:00
|
|
|
static long pc87413_ioctl(struct file *file, unsigned int cmd,
|
|
|
|
unsigned long arg)
|
2006-08-24 09:11:50 -06:00
|
|
|
{
|
2006-10-16 10:18:09 -06:00
|
|
|
int new_timeout;
|
|
|
|
|
|
|
|
union {
|
|
|
|
struct watchdog_info __user *ident;
|
|
|
|
int __user *i;
|
|
|
|
} uarg;
|
|
|
|
|
2009-12-26 11:55:22 -07:00
|
|
|
static const struct watchdog_info ident = {
|
2006-10-16 10:18:09 -06:00
|
|
|
.options = WDIOF_KEEPALIVEPING |
|
2008-05-19 07:07:37 -06:00
|
|
|
WDIOF_SETTIMEOUT |
|
|
|
|
WDIOF_MAGICCLOSE,
|
2006-10-16 10:18:09 -06:00
|
|
|
.firmware_version = 1,
|
2008-08-06 14:19:41 -06:00
|
|
|
.identity = "PC87413(HF/F) watchdog",
|
2006-08-24 09:11:50 -06:00
|
|
|
};
|
|
|
|
|
2006-10-16 10:18:09 -06:00
|
|
|
uarg.i = (int __user *)arg;
|
2006-08-24 09:11:50 -06:00
|
|
|
|
2008-05-19 07:07:37 -06:00
|
|
|
switch (cmd) {
|
|
|
|
case WDIOC_GETSUPPORT:
|
|
|
|
return copy_to_user(uarg.ident, &ident,
|
|
|
|
sizeof(ident)) ? -EFAULT : 0;
|
|
|
|
case WDIOC_GETSTATUS:
|
|
|
|
return put_user(pc87413_status(), uarg.i);
|
|
|
|
case WDIOC_GETBOOTSTATUS:
|
|
|
|
return put_user(0, uarg.i);
|
2008-07-18 05:41:17 -06:00
|
|
|
case WDIOC_SETOPTIONS:
|
|
|
|
{
|
|
|
|
int options, retval = -EINVAL;
|
|
|
|
if (get_user(options, uarg.i))
|
|
|
|
return -EFAULT;
|
|
|
|
if (options & WDIOS_DISABLECARD) {
|
|
|
|
pc87413_disable();
|
|
|
|
retval = 0;
|
|
|
|
}
|
|
|
|
if (options & WDIOS_ENABLECARD) {
|
|
|
|
pc87413_enable();
|
|
|
|
retval = 0;
|
|
|
|
}
|
|
|
|
return retval;
|
|
|
|
}
|
2008-05-19 07:07:37 -06:00
|
|
|
case WDIOC_KEEPALIVE:
|
|
|
|
pc87413_refresh();
|
2006-10-16 10:18:09 -06:00
|
|
|
#ifdef DEBUG
|
2012-02-15 16:06:19 -07:00
|
|
|
pr_info(DPFX "keepalive\n");
|
2006-10-16 10:18:09 -06:00
|
|
|
#endif
|
2008-05-19 07:07:37 -06:00
|
|
|
return 0;
|
|
|
|
case WDIOC_SETTIMEOUT:
|
|
|
|
if (get_user(new_timeout, uarg.i))
|
|
|
|
return -EFAULT;
|
|
|
|
/* the API states this is given in secs */
|
|
|
|
new_timeout /= 60;
|
|
|
|
if (new_timeout < 0 || new_timeout > MAX_TIMEOUT)
|
|
|
|
return -EINVAL;
|
|
|
|
timeout = new_timeout;
|
|
|
|
pc87413_refresh();
|
|
|
|
/* fall through and return the new timeout... */
|
|
|
|
case WDIOC_GETTIMEOUT:
|
|
|
|
new_timeout = timeout * 60;
|
|
|
|
return put_user(new_timeout, uarg.i);
|
|
|
|
default:
|
|
|
|
return -ENOTTY;
|
2006-08-24 09:11:50 -06:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2006-10-16 10:18:09 -06:00
|
|
|
/* -- Notifier funtions -----------------------------------------*/
|
|
|
|
|
2006-08-24 09:11:50 -06:00
|
|
|
/**
|
|
|
|
* notify_sys:
|
|
|
|
* @this: our notifier block
|
|
|
|
* @code: the event being reported
|
|
|
|
* @unused: unused
|
|
|
|
*
|
|
|
|
* Our notifier is called on system shutdowns. We want to turn the card
|
|
|
|
* off at reboot otherwise the machine will reboot again during memory
|
|
|
|
* test or worse yet during the following fsck. This would suck, in fact
|
|
|
|
* trust me - if it happens it does suck.
|
|
|
|
*/
|
|
|
|
|
2006-10-16 10:18:09 -06:00
|
|
|
static int pc87413_notify_sys(struct notifier_block *this,
|
|
|
|
unsigned long code,
|
|
|
|
void *unused)
|
2006-08-24 09:11:50 -06:00
|
|
|
{
|
2006-10-16 10:18:09 -06:00
|
|
|
if (code == SYS_DOWN || code == SYS_HALT)
|
2006-08-24 09:11:50 -06:00
|
|
|
/* Turn the card off */
|
|
|
|
pc87413_disable();
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
2006-10-16 10:18:09 -06:00
|
|
|
/* -- Module's structures ---------------------------------------*/
|
2006-08-24 09:11:50 -06:00
|
|
|
|
2007-02-12 01:55:32 -07:00
|
|
|
static const struct file_operations pc87413_fops = {
|
2006-08-24 09:11:50 -06:00
|
|
|
.owner = THIS_MODULE,
|
2006-10-16 10:18:09 -06:00
|
|
|
.llseek = no_llseek,
|
2006-08-24 09:11:50 -06:00
|
|
|
.write = pc87413_write,
|
2008-05-19 07:07:37 -06:00
|
|
|
.unlocked_ioctl = pc87413_ioctl,
|
2006-08-24 09:11:50 -06:00
|
|
|
.open = pc87413_open,
|
|
|
|
.release = pc87413_release,
|
|
|
|
};
|
|
|
|
|
2008-05-19 07:07:37 -06:00
|
|
|
static struct notifier_block pc87413_notifier = {
|
2006-10-16 10:18:09 -06:00
|
|
|
.notifier_call = pc87413_notify_sys,
|
2006-08-24 09:11:50 -06:00
|
|
|
};
|
|
|
|
|
2008-05-19 07:07:37 -06:00
|
|
|
static struct miscdevice pc87413_miscdev = {
|
2006-10-16 10:18:09 -06:00
|
|
|
.minor = WATCHDOG_MINOR,
|
|
|
|
.name = "watchdog",
|
2008-08-06 14:19:41 -06:00
|
|
|
.fops = &pc87413_fops,
|
2006-08-24 09:11:50 -06:00
|
|
|
};
|
|
|
|
|
2006-10-16 10:18:09 -06:00
|
|
|
/* -- Module init functions -------------------------------------*/
|
2006-08-24 09:11:50 -06:00
|
|
|
|
|
|
|
/**
|
2011-02-23 13:04:38 -07:00
|
|
|
* pc87413_init: module's "constructor"
|
2006-08-24 09:11:50 -06:00
|
|
|
*
|
|
|
|
* Set up the WDT watchdog board. All we have to do is grab the
|
|
|
|
* resources we require and bitch if anyone beat us to them.
|
|
|
|
* The open() function will actually kick the board off.
|
|
|
|
*/
|
|
|
|
|
2006-10-16 10:18:09 -06:00
|
|
|
static int __init pc87413_init(void)
|
2006-08-24 09:11:50 -06:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
2012-02-15 16:06:19 -07:00
|
|
|
pr_info("Version " VERSION " at io 0x%X\n",
|
2008-05-19 07:07:37 -06:00
|
|
|
WDT_INDEX_IO_PORT);
|
2006-08-24 09:11:50 -06:00
|
|
|
|
2011-04-14 13:02:39 -06:00
|
|
|
if (!request_muxed_region(io, 2, MODNAME))
|
|
|
|
return -EBUSY;
|
2006-08-24 09:11:50 -06:00
|
|
|
|
|
|
|
ret = register_reboot_notifier(&pc87413_notifier);
|
|
|
|
if (ret != 0) {
|
2012-02-15 16:06:19 -07:00
|
|
|
pr_err("cannot register reboot notifier (err=%d)\n", ret);
|
2006-08-24 09:11:50 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
ret = misc_register(&pc87413_miscdev);
|
|
|
|
if (ret != 0) {
|
2012-02-15 16:06:19 -07:00
|
|
|
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
|
|
|
|
WATCHDOG_MINOR, ret);
|
2011-04-14 13:02:39 -06:00
|
|
|
goto reboot_unreg;
|
2006-08-24 09:11:50 -06:00
|
|
|
}
|
2012-02-15 16:06:19 -07:00
|
|
|
pr_info("initialized. timeout=%d min\n", timeout);
|
2011-04-14 13:02:39 -06:00
|
|
|
|
|
|
|
pc87413_select_wdt_out();
|
|
|
|
pc87413_enable_swc();
|
|
|
|
pc87413_get_swc_base_addr();
|
|
|
|
|
|
|
|
if (!request_region(swc_base_addr, 0x20, MODNAME)) {
|
2012-02-15 16:06:19 -07:00
|
|
|
pr_err("cannot request SWC region at 0x%x\n", swc_base_addr);
|
2011-04-14 13:02:39 -06:00
|
|
|
ret = -EBUSY;
|
|
|
|
goto misc_unreg;
|
|
|
|
}
|
|
|
|
|
2006-10-16 10:18:09 -06:00
|
|
|
pc87413_enable();
|
2011-04-14 13:02:39 -06:00
|
|
|
|
|
|
|
release_region(io, 2);
|
2006-08-24 09:11:50 -06:00
|
|
|
return 0;
|
2011-04-14 13:02:39 -06:00
|
|
|
|
|
|
|
misc_unreg:
|
|
|
|
misc_deregister(&pc87413_miscdev);
|
|
|
|
reboot_unreg:
|
|
|
|
unregister_reboot_notifier(&pc87413_notifier);
|
|
|
|
release_region(io, 2);
|
|
|
|
return ret;
|
2006-08-24 09:11:50 -06:00
|
|
|
}
|
|
|
|
|
2006-10-16 10:18:09 -06:00
|
|
|
/**
|
|
|
|
* pc87413_exit: module's "destructor"
|
|
|
|
*
|
|
|
|
* Unload the watchdog. You cannot do this with any file handles open.
|
|
|
|
* If your watchdog is set to continue ticking on close and you unload
|
|
|
|
* it, well it keeps ticking. We won't get the interrupt but the board
|
|
|
|
* will not touch PC memory so all is fine. You just have to load a new
|
|
|
|
* module in 60 seconds or reboot.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static void __exit pc87413_exit(void)
|
|
|
|
{
|
|
|
|
/* Stop the timer before we leave */
|
2008-05-19 07:07:37 -06:00
|
|
|
if (!nowayout) {
|
2006-10-16 10:18:09 -06:00
|
|
|
pc87413_disable();
|
2012-02-15 16:06:19 -07:00
|
|
|
pr_info("Watchdog disabled\n");
|
2006-10-16 10:18:09 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
misc_deregister(&pc87413_miscdev);
|
|
|
|
unregister_reboot_notifier(&pc87413_notifier);
|
2011-04-14 13:02:39 -06:00
|
|
|
release_region(swc_base_addr, 0x20);
|
2006-10-16 10:18:09 -06:00
|
|
|
|
2012-02-15 16:06:19 -07:00
|
|
|
pr_info("watchdog component driver removed\n");
|
2006-10-16 10:18:09 -06:00
|
|
|
}
|
2006-08-24 09:11:50 -06:00
|
|
|
|
|
|
|
module_init(pc87413_init);
|
|
|
|
module_exit(pc87413_exit);
|
|
|
|
|
2009-03-18 02:35:09 -06:00
|
|
|
MODULE_AUTHOR("Sven Anders <anders@anduras.de>, "
|
|
|
|
"Marcus Junker <junker@anduras.de>,");
|
2006-08-24 09:11:50 -06:00
|
|
|
MODULE_DESCRIPTION("PC87413 WDT driver");
|
2006-10-16 10:18:09 -06:00
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
|
|
|
|
module_param(io, int, 0);
|
2010-05-01 10:46:15 -06:00
|
|
|
MODULE_PARM_DESC(io, MODNAME " I/O port (default: "
|
|
|
|
__MODULE_STRING(IO_DEFAULT) ").");
|
2006-10-16 10:18:09 -06:00
|
|
|
|
|
|
|
module_param(timeout, int, 0);
|
2008-05-19 07:07:37 -06:00
|
|
|
MODULE_PARM_DESC(timeout,
|
|
|
|
"Watchdog timeout in minutes (default="
|
2010-05-01 10:46:15 -06:00
|
|
|
__MODULE_STRING(DEFAULT_TIMEOUT) ").");
|
2006-10-16 10:18:09 -06:00
|
|
|
|
2012-03-05 08:51:11 -07:00
|
|
|
module_param(nowayout, bool, 0);
|
2008-05-19 07:07:37 -06:00
|
|
|
MODULE_PARM_DESC(nowayout,
|
|
|
|
"Watchdog cannot be stopped once started (default="
|
|
|
|
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
2006-10-16 10:18:09 -06:00
|
|
|
|