1b7e04f8cSWim Van Sebroeck /* 2b7e04f8cSWim Van Sebroeck * NS pc87413-wdt Watchdog Timer driver for Linux 2.6.x.x 3b7e04f8cSWim Van Sebroeck * 4b7e04f8cSWim Van Sebroeck * This code is based on wdt.c with original copyright. 5b7e04f8cSWim Van Sebroeck * 6b7e04f8cSWim Van Sebroeck * (C) Copyright 2006 Sven Anders, <anders@anduras.de> 7b7e04f8cSWim Van Sebroeck * and Marcus Junker, <junker@anduras.de> 8b7e04f8cSWim Van Sebroeck * 9b7e04f8cSWim Van Sebroeck * This program is free software; you can redistribute it and/or 10b7e04f8cSWim Van Sebroeck * modify it under the terms of the GNU General Public License 11b7e04f8cSWim Van Sebroeck * as published by the Free Software Foundation; either version 12b7e04f8cSWim Van Sebroeck * 2 of the License, or (at your option) any later version. 13b7e04f8cSWim Van Sebroeck * 14b7e04f8cSWim Van Sebroeck * Neither Sven Anders, Marcus Junker nor ANDURAS AG 15b7e04f8cSWim Van Sebroeck * admit liability nor provide warranty for any of this software. 16b7e04f8cSWim Van Sebroeck * This material is provided "AS-IS" and at no charge. 17b7e04f8cSWim Van Sebroeck * 18b7e04f8cSWim Van Sebroeck * Release 1.1 19b7e04f8cSWim Van Sebroeck */ 20b7e04f8cSWim Van Sebroeck 21b7e04f8cSWim Van Sebroeck #include <linux/module.h> 22b7e04f8cSWim Van Sebroeck #include <linux/types.h> 23b7e04f8cSWim Van Sebroeck #include <linux/miscdevice.h> 24b7e04f8cSWim Van Sebroeck #include <linux/watchdog.h> 25b7e04f8cSWim Van Sebroeck #include <linux/ioport.h> 26b7e04f8cSWim Van Sebroeck #include <linux/delay.h> 27b7e04f8cSWim Van Sebroeck #include <linux/notifier.h> 28b7e04f8cSWim Van Sebroeck #include <linux/fs.h> 29b7e04f8cSWim Van Sebroeck #include <linux/reboot.h> 30b7e04f8cSWim Van Sebroeck #include <linux/init.h> 31b7e04f8cSWim Van Sebroeck #include <linux/spinlock.h> 32b7e04f8cSWim Van Sebroeck #include <linux/moduleparam.h> 33b7e04f8cSWim Van Sebroeck #include <linux/version.h> 34b7e04f8cSWim Van Sebroeck 35b7e04f8cSWim Van Sebroeck #include <asm/io.h> 36b7e04f8cSWim Van Sebroeck #include <asm/uaccess.h> 37b7e04f8cSWim Van Sebroeck #include <asm/system.h> 38b7e04f8cSWim Van Sebroeck 39b7e04f8cSWim Van Sebroeck /* #define DEBUG 1 */ 40b7e04f8cSWim Van Sebroeck 41b7e04f8cSWim Van Sebroeck #define DEFAULT_TIMEOUT 1 /* 1 minute */ 42b7e04f8cSWim Van Sebroeck #define MAX_TIMEOUT 255 43b7e04f8cSWim Van Sebroeck 44b7e04f8cSWim Van Sebroeck #define VERSION "1.1" 45b7e04f8cSWim Van Sebroeck #define MODNAME "pc87413 WDT" 46b7e04f8cSWim Van Sebroeck #define PFX MODNAME ": " 47b7e04f8cSWim Van Sebroeck #define DPFX MODNAME " - DEBUG: " 48b7e04f8cSWim Van Sebroeck 49b7e04f8cSWim Van Sebroeck #define WDT_INDEX_IO_PORT (io+0) /* I/O port base (index register) */ 50b7e04f8cSWim Van Sebroeck #define WDT_DATA_IO_PORT (WDT_INDEX_IO_PORT+1) 51b7e04f8cSWim Van Sebroeck #define SWC_LDN 0x04 52b7e04f8cSWim Van Sebroeck #define SIOCFG2 0x22 /* Serial IO register */ 53b7e04f8cSWim Van Sebroeck #define WDCTL 0x10 /* Watchdog-Timer-Controll-Register */ 54b7e04f8cSWim Van Sebroeck #define WDTO 0x11 /* Watchdog timeout register */ 55b7e04f8cSWim Van Sebroeck #define WDCFG 0x12 /* Watchdog config register */ 56b7e04f8cSWim Van Sebroeck 57b7e04f8cSWim Van Sebroeck static int io = 0x2E; /* Address used on Portwell Boards */ 58b7e04f8cSWim Van Sebroeck 59b7e04f8cSWim Van Sebroeck static int timeout = DEFAULT_TIMEOUT; /* timeout value */ 60b7e04f8cSWim Van Sebroeck static unsigned long timer_enabled = 0; /* is the timer enabled? */ 61b7e04f8cSWim Van Sebroeck 62b7e04f8cSWim Van Sebroeck static char expect_close; /* is the close expected? */ 63b7e04f8cSWim Van Sebroeck 64b7e04f8cSWim Van Sebroeck static spinlock_t io_lock; /* to guard the watchdog from io races */ 65b7e04f8cSWim Van Sebroeck 66b7e04f8cSWim Van Sebroeck static int nowayout = WATCHDOG_NOWAYOUT; 67b7e04f8cSWim Van Sebroeck 68b7e04f8cSWim Van Sebroeck /* -- Low level function ----------------------------------------*/ 69b7e04f8cSWim Van Sebroeck 70b7e04f8cSWim Van Sebroeck /* Select pins for Watchdog output */ 71b7e04f8cSWim Van Sebroeck 72b7e04f8cSWim Van Sebroeck static inline void pc87413_select_wdt_out (void) 73b7e04f8cSWim Van Sebroeck { 74b7e04f8cSWim Van Sebroeck unsigned int cr_data = 0; 75b7e04f8cSWim Van Sebroeck 76b7e04f8cSWim Van Sebroeck /* Step 1: Select multiple pin,pin55,as WDT output */ 77b7e04f8cSWim Van Sebroeck 78b7e04f8cSWim Van Sebroeck outb_p(SIOCFG2, WDT_INDEX_IO_PORT); 79b7e04f8cSWim Van Sebroeck 80b7e04f8cSWim Van Sebroeck cr_data = inb (WDT_DATA_IO_PORT); 81b7e04f8cSWim Van Sebroeck 82b7e04f8cSWim Van Sebroeck cr_data |= 0x80; /* Set Bit7 to 1*/ 83b7e04f8cSWim Van Sebroeck outb_p(SIOCFG2, WDT_INDEX_IO_PORT); 84b7e04f8cSWim Van Sebroeck 85b7e04f8cSWim Van Sebroeck outb_p(cr_data, WDT_DATA_IO_PORT); 86b7e04f8cSWim Van Sebroeck 87b7e04f8cSWim Van Sebroeck #ifdef DEBUG 88b7e04f8cSWim Van Sebroeck printk(KERN_INFO DPFX "Select multiple pin,pin55,as WDT output:" 89b7e04f8cSWim Van Sebroeck " Bit7 to 1: %d\n", cr_data); 90b7e04f8cSWim Van Sebroeck #endif 91b7e04f8cSWim Van Sebroeck } 92b7e04f8cSWim Van Sebroeck 93b7e04f8cSWim Van Sebroeck /* Enable SWC functions */ 94b7e04f8cSWim Van Sebroeck 95b7e04f8cSWim Van Sebroeck static inline void pc87413_enable_swc(void) 96b7e04f8cSWim Van Sebroeck { 97b7e04f8cSWim Van Sebroeck unsigned int cr_data=0; 98b7e04f8cSWim Van Sebroeck 99b7e04f8cSWim Van Sebroeck /* Step 2: Enable SWC functions */ 100b7e04f8cSWim Van Sebroeck 101b7e04f8cSWim Van Sebroeck outb_p(0x07, WDT_INDEX_IO_PORT); /* Point SWC_LDN (LDN=4) */ 102b7e04f8cSWim Van Sebroeck outb_p(SWC_LDN, WDT_DATA_IO_PORT); 103b7e04f8cSWim Van Sebroeck 104b7e04f8cSWim Van Sebroeck outb_p(0x30, WDT_INDEX_IO_PORT); /* Read Index 0x30 First */ 105b7e04f8cSWim Van Sebroeck cr_data = inb(WDT_DATA_IO_PORT); 106b7e04f8cSWim Van Sebroeck cr_data |= 0x01; /* Set Bit0 to 1 */ 107b7e04f8cSWim Van Sebroeck outb_p(0x30, WDT_INDEX_IO_PORT); 108b7e04f8cSWim Van Sebroeck outb_p(cr_data, WDT_DATA_IO_PORT); /* Index0x30_bit0P1 */ 109b7e04f8cSWim Van Sebroeck 110b7e04f8cSWim Van Sebroeck #ifdef DEBUG 111b7e04f8cSWim Van Sebroeck printk(KERN_INFO DPFX "pc87413 - Enable SWC functions\n"); 112b7e04f8cSWim Van Sebroeck #endif 113b7e04f8cSWim Van Sebroeck } 114b7e04f8cSWim Van Sebroeck 115b7e04f8cSWim Van Sebroeck /* Read SWC I/O base address */ 116b7e04f8cSWim Van Sebroeck 117b7e04f8cSWim Van Sebroeck static inline unsigned int pc87413_get_swc_base(void) 118b7e04f8cSWim Van Sebroeck { 119b7e04f8cSWim Van Sebroeck unsigned int swc_base_addr = 0; 120b7e04f8cSWim Van Sebroeck unsigned char addr_l, addr_h = 0; 121b7e04f8cSWim Van Sebroeck 122b7e04f8cSWim Van Sebroeck /* Step 3: Read SWC I/O Base Address */ 123b7e04f8cSWim Van Sebroeck 124b7e04f8cSWim Van Sebroeck outb_p(0x60, WDT_INDEX_IO_PORT); /* Read Index 0x60 */ 125b7e04f8cSWim Van Sebroeck addr_h = inb(WDT_DATA_IO_PORT); 126b7e04f8cSWim Van Sebroeck 127b7e04f8cSWim Van Sebroeck outb_p(0x61, WDT_INDEX_IO_PORT); /* Read Index 0x61 */ 128b7e04f8cSWim Van Sebroeck 129b7e04f8cSWim Van Sebroeck addr_l = inb(WDT_DATA_IO_PORT); 130b7e04f8cSWim Van Sebroeck 131b7e04f8cSWim Van Sebroeck swc_base_addr = (addr_h << 8) + addr_l; 132b7e04f8cSWim Van Sebroeck 133b7e04f8cSWim Van Sebroeck #ifdef DEBUG 134b7e04f8cSWim Van Sebroeck printk(KERN_INFO DPFX "Read SWC I/O Base Address: low %d, high %d," 135b7e04f8cSWim Van Sebroeck " res %d\n", addr_l, addr_h, swc_base_addr); 136b7e04f8cSWim Van Sebroeck #endif 137b7e04f8cSWim Van Sebroeck 138b7e04f8cSWim Van Sebroeck return swc_base_addr; 139b7e04f8cSWim Van Sebroeck } 140b7e04f8cSWim Van Sebroeck 141b7e04f8cSWim Van Sebroeck /* Select Bank 3 of SWC */ 142b7e04f8cSWim Van Sebroeck 143b7e04f8cSWim Van Sebroeck static inline void pc87413_swc_bank3(unsigned int swc_base_addr) 144b7e04f8cSWim Van Sebroeck { 145b7e04f8cSWim Van Sebroeck /* Step 4: Select Bank3 of SWC */ 146b7e04f8cSWim Van Sebroeck 147b7e04f8cSWim Van Sebroeck outb_p(inb(swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f); 148b7e04f8cSWim Van Sebroeck 149b7e04f8cSWim Van Sebroeck #ifdef DEBUG 150b7e04f8cSWim Van Sebroeck printk(KERN_INFO DPFX "Select Bank3 of SWC\n"); 151b7e04f8cSWim Van Sebroeck #endif 152b7e04f8cSWim Van Sebroeck } 153b7e04f8cSWim Van Sebroeck 154b7e04f8cSWim Van Sebroeck /* Set watchdog timeout to x minutes */ 155b7e04f8cSWim Van Sebroeck 156b7e04f8cSWim Van Sebroeck static inline void pc87413_programm_wdto(unsigned int swc_base_addr, 157b7e04f8cSWim Van Sebroeck char pc87413_time) 158b7e04f8cSWim Van Sebroeck { 159b7e04f8cSWim Van Sebroeck /* Step 5: Programm WDTO, Twd. */ 160b7e04f8cSWim Van Sebroeck 161b7e04f8cSWim Van Sebroeck outb_p(pc87413_time, swc_base_addr + WDTO); 162b7e04f8cSWim Van Sebroeck 163b7e04f8cSWim Van Sebroeck #ifdef DEBUG 164b7e04f8cSWim Van Sebroeck printk(KERN_INFO DPFX "Set WDTO to %d minutes\n", pc87413_time); 165b7e04f8cSWim Van Sebroeck #endif 166b7e04f8cSWim Van Sebroeck } 167b7e04f8cSWim Van Sebroeck 168b7e04f8cSWim Van Sebroeck /* Enable WDEN */ 169b7e04f8cSWim Van Sebroeck 170b7e04f8cSWim Van Sebroeck static inline void pc87413_enable_wden(unsigned int swc_base_addr) 171b7e04f8cSWim Van Sebroeck { 172b7e04f8cSWim Van Sebroeck /* Step 6: Enable WDEN */ 173b7e04f8cSWim Van Sebroeck 174b7e04f8cSWim Van Sebroeck outb_p(inb (swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL); 175b7e04f8cSWim Van Sebroeck 176b7e04f8cSWim Van Sebroeck #ifdef DEBUG 177b7e04f8cSWim Van Sebroeck printk(KERN_INFO DPFX "Enable WDEN\n"); 178b7e04f8cSWim Van Sebroeck #endif 179b7e04f8cSWim Van Sebroeck } 180b7e04f8cSWim Van Sebroeck 181b7e04f8cSWim Van Sebroeck /* Enable SW_WD_TREN */ 182b7e04f8cSWim Van Sebroeck static inline void pc87413_enable_sw_wd_tren(unsigned int swc_base_addr) 183b7e04f8cSWim Van Sebroeck { 184b7e04f8cSWim Van Sebroeck /* Enable SW_WD_TREN */ 185b7e04f8cSWim Van Sebroeck 186b7e04f8cSWim Van Sebroeck outb_p(inb (swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG); 187b7e04f8cSWim Van Sebroeck 188b7e04f8cSWim Van Sebroeck #ifdef DEBUG 189b7e04f8cSWim Van Sebroeck printk(KERN_INFO DPFX "Enable SW_WD_TREN\n"); 190b7e04f8cSWim Van Sebroeck #endif 191b7e04f8cSWim Van Sebroeck } 192b7e04f8cSWim Van Sebroeck 193b7e04f8cSWim Van Sebroeck /* Disable SW_WD_TREN */ 194b7e04f8cSWim Van Sebroeck 195b7e04f8cSWim Van Sebroeck static inline void pc87413_disable_sw_wd_tren(unsigned int swc_base_addr) 196b7e04f8cSWim Van Sebroeck { 197b7e04f8cSWim Van Sebroeck /* Disable SW_WD_TREN */ 198b7e04f8cSWim Van Sebroeck 199b7e04f8cSWim Van Sebroeck outb_p(inb (swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG); 200b7e04f8cSWim Van Sebroeck 201b7e04f8cSWim Van Sebroeck #ifdef DEBUG 202b7e04f8cSWim Van Sebroeck printk(KERN_INFO DPFX "pc87413 - Disable SW_WD_TREN\n"); 203b7e04f8cSWim Van Sebroeck #endif 204b7e04f8cSWim Van Sebroeck } 205b7e04f8cSWim Van Sebroeck 206b7e04f8cSWim Van Sebroeck /* Enable SW_WD_TRG */ 207b7e04f8cSWim Van Sebroeck 208b7e04f8cSWim Van Sebroeck static inline void pc87413_enable_sw_wd_trg(unsigned int swc_base_addr) 209b7e04f8cSWim Van Sebroeck { 210b7e04f8cSWim Van Sebroeck /* Enable SW_WD_TRG */ 211b7e04f8cSWim Van Sebroeck 212b7e04f8cSWim Van Sebroeck outb_p(inb (swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL); 213b7e04f8cSWim Van Sebroeck 214b7e04f8cSWim Van Sebroeck #ifdef DEBUG 215b7e04f8cSWim Van Sebroeck printk(KERN_INFO DPFX "pc87413 - Enable SW_WD_TRG\n"); 216b7e04f8cSWim Van Sebroeck #endif 217b7e04f8cSWim Van Sebroeck } 218b7e04f8cSWim Van Sebroeck 219b7e04f8cSWim Van Sebroeck /* Disable SW_WD_TRG */ 220b7e04f8cSWim Van Sebroeck 221b7e04f8cSWim Van Sebroeck static inline void pc87413_disable_sw_wd_trg(unsigned int swc_base_addr) 222b7e04f8cSWim Van Sebroeck { 223b7e04f8cSWim Van Sebroeck /* Disable SW_WD_TRG */ 224b7e04f8cSWim Van Sebroeck 225b7e04f8cSWim Van Sebroeck outb_p(inb (swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL); 226b7e04f8cSWim Van Sebroeck 227b7e04f8cSWim Van Sebroeck #ifdef DEBUG 228b7e04f8cSWim Van Sebroeck printk(KERN_INFO DPFX "Disable SW_WD_TRG\n"); 229b7e04f8cSWim Van Sebroeck #endif 230b7e04f8cSWim Van Sebroeck } 231b7e04f8cSWim Van Sebroeck 232b7e04f8cSWim Van Sebroeck /* -- Higher level functions ------------------------------------*/ 233b7e04f8cSWim Van Sebroeck 234b7e04f8cSWim Van Sebroeck /* Enable the watchdog */ 235b7e04f8cSWim Van Sebroeck 236b7e04f8cSWim Van Sebroeck static void pc87413_enable(void) 237b7e04f8cSWim Van Sebroeck { 238b7e04f8cSWim Van Sebroeck unsigned int swc_base_addr; 239b7e04f8cSWim Van Sebroeck 240b7e04f8cSWim Van Sebroeck spin_lock(&io_lock); 241b7e04f8cSWim Van Sebroeck 242b7e04f8cSWim Van Sebroeck pc87413_select_wdt_out(); 243b7e04f8cSWim Van Sebroeck pc87413_enable_swc(); 244b7e04f8cSWim Van Sebroeck swc_base_addr = pc87413_get_swc_base(); 245b7e04f8cSWim Van Sebroeck pc87413_swc_bank3(swc_base_addr); 246b7e04f8cSWim Van Sebroeck pc87413_programm_wdto(swc_base_addr, timeout); 247b7e04f8cSWim Van Sebroeck pc87413_enable_wden(swc_base_addr); 248b7e04f8cSWim Van Sebroeck pc87413_enable_sw_wd_tren(swc_base_addr); 249b7e04f8cSWim Van Sebroeck pc87413_enable_sw_wd_trg(swc_base_addr); 250b7e04f8cSWim Van Sebroeck 251b7e04f8cSWim Van Sebroeck spin_unlock(&io_lock); 252b7e04f8cSWim Van Sebroeck } 253b7e04f8cSWim Van Sebroeck 254b7e04f8cSWim Van Sebroeck /* Disable the watchdog */ 255b7e04f8cSWim Van Sebroeck 256b7e04f8cSWim Van Sebroeck static void pc87413_disable(void) 257b7e04f8cSWim Van Sebroeck { 258b7e04f8cSWim Van Sebroeck unsigned int swc_base_addr; 259b7e04f8cSWim Van Sebroeck 260b7e04f8cSWim Van Sebroeck spin_lock(&io_lock); 261b7e04f8cSWim Van Sebroeck 262b7e04f8cSWim Van Sebroeck pc87413_select_wdt_out(); 263b7e04f8cSWim Van Sebroeck pc87413_enable_swc(); 264b7e04f8cSWim Van Sebroeck swc_base_addr = pc87413_get_swc_base(); 265b7e04f8cSWim Van Sebroeck pc87413_swc_bank3(swc_base_addr); 266b7e04f8cSWim Van Sebroeck pc87413_disable_sw_wd_tren(swc_base_addr); 267b7e04f8cSWim Van Sebroeck pc87413_disable_sw_wd_trg(swc_base_addr); 268b7e04f8cSWim Van Sebroeck pc87413_programm_wdto(swc_base_addr, 0); 269b7e04f8cSWim Van Sebroeck 270b7e04f8cSWim Van Sebroeck spin_unlock(&io_lock); 271b7e04f8cSWim Van Sebroeck } 272b7e04f8cSWim Van Sebroeck 273b7e04f8cSWim Van Sebroeck /* Refresh the watchdog */ 274b7e04f8cSWim Van Sebroeck 275b7e04f8cSWim Van Sebroeck static void pc87413_refresh(void) 276b7e04f8cSWim Van Sebroeck { 277b7e04f8cSWim Van Sebroeck unsigned int swc_base_addr; 278b7e04f8cSWim Van Sebroeck 279b7e04f8cSWim Van Sebroeck spin_lock(&io_lock); 280b7e04f8cSWim Van Sebroeck 281b7e04f8cSWim Van Sebroeck pc87413_select_wdt_out(); 282b7e04f8cSWim Van Sebroeck pc87413_enable_swc(); 283b7e04f8cSWim Van Sebroeck swc_base_addr = pc87413_get_swc_base(); 284b7e04f8cSWim Van Sebroeck pc87413_swc_bank3(swc_base_addr); 285b7e04f8cSWim Van Sebroeck pc87413_disable_sw_wd_tren(swc_base_addr); 286b7e04f8cSWim Van Sebroeck pc87413_disable_sw_wd_trg(swc_base_addr); 287b7e04f8cSWim Van Sebroeck pc87413_programm_wdto(swc_base_addr, timeout); 288b7e04f8cSWim Van Sebroeck pc87413_enable_wden(swc_base_addr); 289b7e04f8cSWim Van Sebroeck pc87413_enable_sw_wd_tren(swc_base_addr); 290b7e04f8cSWim Van Sebroeck pc87413_enable_sw_wd_trg(swc_base_addr); 291b7e04f8cSWim Van Sebroeck 292b7e04f8cSWim Van Sebroeck spin_unlock(&io_lock); 293b7e04f8cSWim Van Sebroeck } 294b7e04f8cSWim Van Sebroeck 295b7e04f8cSWim Van Sebroeck /* -- File operations -------------------------------------------*/ 296b7e04f8cSWim Van Sebroeck 297b7e04f8cSWim Van Sebroeck /** 298b7e04f8cSWim Van Sebroeck * pc87413_open: 299b7e04f8cSWim Van Sebroeck * @inode: inode of device 300b7e04f8cSWim Van Sebroeck * @file: file handle to device 301b7e04f8cSWim Van Sebroeck * 302b7e04f8cSWim Van Sebroeck */ 303b7e04f8cSWim Van Sebroeck 304b7e04f8cSWim Van Sebroeck static int pc87413_open(struct inode *inode, struct file *file) 305b7e04f8cSWim Van Sebroeck { 306b7e04f8cSWim Van Sebroeck /* /dev/watchdog can only be opened once */ 307b7e04f8cSWim Van Sebroeck 308b7e04f8cSWim Van Sebroeck if (test_and_set_bit(0, &timer_enabled)) 309b7e04f8cSWim Van Sebroeck return -EBUSY; 310b7e04f8cSWim Van Sebroeck 311b7e04f8cSWim Van Sebroeck if (nowayout) 312b7e04f8cSWim Van Sebroeck __module_get(THIS_MODULE); 313b7e04f8cSWim Van Sebroeck 314b7e04f8cSWim Van Sebroeck /* Reload and activate timer */ 315b7e04f8cSWim Van Sebroeck pc87413_refresh(); 316b7e04f8cSWim Van Sebroeck 317b7e04f8cSWim Van Sebroeck printk(KERN_INFO MODNAME "Watchdog enabled. Timeout set to" 318b7e04f8cSWim Van Sebroeck " %d minute(s).\n", timeout); 319b7e04f8cSWim Van Sebroeck 320b7e04f8cSWim Van Sebroeck return nonseekable_open(inode, file); 321b7e04f8cSWim Van Sebroeck } 322b7e04f8cSWim Van Sebroeck 323b7e04f8cSWim Van Sebroeck /** 324b7e04f8cSWim Van Sebroeck * pc87413_release: 325b7e04f8cSWim Van Sebroeck * @inode: inode to board 326b7e04f8cSWim Van Sebroeck * @file: file handle to board 327b7e04f8cSWim Van Sebroeck * 328b7e04f8cSWim Van Sebroeck * The watchdog has a configurable API. There is a religious dispute 329b7e04f8cSWim Van Sebroeck * between people who want their watchdog to be able to shut down and 330b7e04f8cSWim Van Sebroeck * those who want to be sure if the watchdog manager dies the machine 331b7e04f8cSWim Van Sebroeck * reboots. In the former case we disable the counters, in the latter 332b7e04f8cSWim Van Sebroeck * case you have to open it again very soon. 333b7e04f8cSWim Van Sebroeck */ 334b7e04f8cSWim Van Sebroeck 335b7e04f8cSWim Van Sebroeck static int pc87413_release(struct inode *inode, struct file *file) 336b7e04f8cSWim Van Sebroeck { 337b7e04f8cSWim Van Sebroeck /* Shut off the timer. */ 338b7e04f8cSWim Van Sebroeck 339b7e04f8cSWim Van Sebroeck if (expect_close == 42) { 340b7e04f8cSWim Van Sebroeck pc87413_disable(); 341b7e04f8cSWim Van Sebroeck printk(KERN_INFO MODNAME "Watchdog disabled," 342b7e04f8cSWim Van Sebroeck " sleeping again...\n"); 343b7e04f8cSWim Van Sebroeck } else { 344b7e04f8cSWim Van Sebroeck printk(KERN_CRIT MODNAME "Unexpected close, not stopping" 345b7e04f8cSWim Van Sebroeck " watchdog!\n"); 346b7e04f8cSWim Van Sebroeck pc87413_refresh(); 347b7e04f8cSWim Van Sebroeck } 348b7e04f8cSWim Van Sebroeck 349b7e04f8cSWim Van Sebroeck clear_bit(0, &timer_enabled); 350b7e04f8cSWim Van Sebroeck expect_close = 0; 351b7e04f8cSWim Van Sebroeck 352b7e04f8cSWim Van Sebroeck return 0; 353b7e04f8cSWim Van Sebroeck } 354b7e04f8cSWim Van Sebroeck 355b7e04f8cSWim Van Sebroeck /** 356b7e04f8cSWim Van Sebroeck * pc87413_status: 357b7e04f8cSWim Van Sebroeck * 358b7e04f8cSWim Van Sebroeck * return, if the watchdog is enabled (timeout is set...) 359b7e04f8cSWim Van Sebroeck */ 360b7e04f8cSWim Van Sebroeck 361b7e04f8cSWim Van Sebroeck 362b7e04f8cSWim Van Sebroeck static int pc87413_status(void) 363b7e04f8cSWim Van Sebroeck { 364b7e04f8cSWim Van Sebroeck return 0; /* currently not supported */ 365b7e04f8cSWim Van Sebroeck } 366b7e04f8cSWim Van Sebroeck 367b7e04f8cSWim Van Sebroeck /** 368b7e04f8cSWim Van Sebroeck * pc87413_write: 369b7e04f8cSWim Van Sebroeck * @file: file handle to the watchdog 370b7e04f8cSWim Van Sebroeck * @data: data buffer to write 371b7e04f8cSWim Van Sebroeck * @len: length in bytes 372b7e04f8cSWim Van Sebroeck * @ppos: pointer to the position to write. No seeks allowed 373b7e04f8cSWim Van Sebroeck * 374b7e04f8cSWim Van Sebroeck * A write to a watchdog device is defined as a keepalive signal. Any 375b7e04f8cSWim Van Sebroeck * write of data will do, as we we don't define content meaning. 376b7e04f8cSWim Van Sebroeck */ 377b7e04f8cSWim Van Sebroeck 378b7e04f8cSWim Van Sebroeck static ssize_t pc87413_write(struct file *file, const char __user *data, 379b7e04f8cSWim Van Sebroeck size_t len, loff_t *ppos) 380b7e04f8cSWim Van Sebroeck { 381b7e04f8cSWim Van Sebroeck /* See if we got the magic character 'V' and reload the timer */ 382b7e04f8cSWim Van Sebroeck if (len) { 383b7e04f8cSWim Van Sebroeck if (!nowayout) { 384b7e04f8cSWim Van Sebroeck size_t i; 385b7e04f8cSWim Van Sebroeck 386b7e04f8cSWim Van Sebroeck /* reset expect flag */ 387b7e04f8cSWim Van Sebroeck expect_close = 0; 388b7e04f8cSWim Van Sebroeck 389b7e04f8cSWim Van Sebroeck /* scan to see whether or not we got the magic character */ 390b7e04f8cSWim Van Sebroeck for (i = 0; i != len; i++) { 391b7e04f8cSWim Van Sebroeck char c; 392b7e04f8cSWim Van Sebroeck if (get_user(c, data+i)) 393b7e04f8cSWim Van Sebroeck return -EFAULT; 394b7e04f8cSWim Van Sebroeck if (c == 'V') 395b7e04f8cSWim Van Sebroeck expect_close = 42; 396b7e04f8cSWim Van Sebroeck } 397b7e04f8cSWim Van Sebroeck } 398b7e04f8cSWim Van Sebroeck 399b7e04f8cSWim Van Sebroeck /* someone wrote to us, we should reload the timer */ 400b7e04f8cSWim Van Sebroeck pc87413_refresh(); 401b7e04f8cSWim Van Sebroeck } 402b7e04f8cSWim Van Sebroeck return len; 403b7e04f8cSWim Van Sebroeck } 404b7e04f8cSWim Van Sebroeck 405b7e04f8cSWim Van Sebroeck /** 406b7e04f8cSWim Van Sebroeck * pc87413_ioctl: 407b7e04f8cSWim Van Sebroeck * @inode: inode of the device 408b7e04f8cSWim Van Sebroeck * @file: file handle to the device 409b7e04f8cSWim Van Sebroeck * @cmd: watchdog command 410b7e04f8cSWim Van Sebroeck * @arg: argument pointer 411b7e04f8cSWim Van Sebroeck * 412b7e04f8cSWim Van Sebroeck * The watchdog API defines a common set of functions for all watchdogs 413b7e04f8cSWim Van Sebroeck * according to their available features. We only actually usefully support 414b7e04f8cSWim Van Sebroeck * querying capabilities and current status. 415b7e04f8cSWim Van Sebroeck */ 416b7e04f8cSWim Van Sebroeck 417b7e04f8cSWim Van Sebroeck static int pc87413_ioctl(struct inode *inode, struct file *file, 418b7e04f8cSWim Van Sebroeck unsigned int cmd, unsigned long arg) 419b7e04f8cSWim Van Sebroeck { 420b7e04f8cSWim Van Sebroeck int new_timeout; 421b7e04f8cSWim Van Sebroeck 422b7e04f8cSWim Van Sebroeck union { 423b7e04f8cSWim Van Sebroeck struct watchdog_info __user *ident; 424b7e04f8cSWim Van Sebroeck int __user *i; 425b7e04f8cSWim Van Sebroeck } uarg; 426b7e04f8cSWim Van Sebroeck 427b7e04f8cSWim Van Sebroeck static struct watchdog_info ident = { 428b7e04f8cSWim Van Sebroeck .options = WDIOF_KEEPALIVEPING | 429b7e04f8cSWim Van Sebroeck WDIOF_SETTIMEOUT | 430b7e04f8cSWim Van Sebroeck WDIOF_MAGICCLOSE, 431b7e04f8cSWim Van Sebroeck .firmware_version = 1, 432b7e04f8cSWim Van Sebroeck .identity = "PC87413(HF/F) watchdog" 433b7e04f8cSWim Van Sebroeck }; 434b7e04f8cSWim Van Sebroeck 435b7e04f8cSWim Van Sebroeck uarg.i = (int __user *)arg; 436b7e04f8cSWim Van Sebroeck 437b7e04f8cSWim Van Sebroeck switch(cmd) { 438b7e04f8cSWim Van Sebroeck default: 439b7e04f8cSWim Van Sebroeck return -ENOTTY; 440b7e04f8cSWim Van Sebroeck 441b7e04f8cSWim Van Sebroeck case WDIOC_GETSUPPORT: 442b7e04f8cSWim Van Sebroeck return copy_to_user(uarg.ident, &ident, 443b7e04f8cSWim Van Sebroeck sizeof(ident)) ? -EFAULT : 0; 444b7e04f8cSWim Van Sebroeck 445b7e04f8cSWim Van Sebroeck case WDIOC_GETSTATUS: 446b7e04f8cSWim Van Sebroeck return put_user(pc87413_status(), uarg.i); 447b7e04f8cSWim Van Sebroeck 448b7e04f8cSWim Van Sebroeck case WDIOC_GETBOOTSTATUS: 449b7e04f8cSWim Van Sebroeck return put_user(0, uarg.i); 450b7e04f8cSWim Van Sebroeck 451b7e04f8cSWim Van Sebroeck case WDIOC_KEEPALIVE: 452b7e04f8cSWim Van Sebroeck pc87413_refresh(); 453b7e04f8cSWim Van Sebroeck #ifdef DEBUG 454b7e04f8cSWim Van Sebroeck printk(KERN_INFO DPFX "keepalive\n"); 455b7e04f8cSWim Van Sebroeck #endif 456b7e04f8cSWim Van Sebroeck return 0; 457b7e04f8cSWim Van Sebroeck 458b7e04f8cSWim Van Sebroeck case WDIOC_SETTIMEOUT: 459b7e04f8cSWim Van Sebroeck if (get_user(new_timeout, uarg.i)) 460b7e04f8cSWim Van Sebroeck return -EFAULT; 461b7e04f8cSWim Van Sebroeck 462b7e04f8cSWim Van Sebroeck // the API states this is given in secs 463b7e04f8cSWim Van Sebroeck new_timeout /= 60; 464b7e04f8cSWim Van Sebroeck 465b7e04f8cSWim Van Sebroeck if (new_timeout < 0 || new_timeout > MAX_TIMEOUT) 466b7e04f8cSWim Van Sebroeck return -EINVAL; 467b7e04f8cSWim Van Sebroeck 468b7e04f8cSWim Van Sebroeck timeout = new_timeout; 469b7e04f8cSWim Van Sebroeck pc87413_refresh(); 470b7e04f8cSWim Van Sebroeck 471b7e04f8cSWim Van Sebroeck // fall through and return the new timeout... 472b7e04f8cSWim Van Sebroeck 473b7e04f8cSWim Van Sebroeck case WDIOC_GETTIMEOUT: 474b7e04f8cSWim Van Sebroeck 475b7e04f8cSWim Van Sebroeck new_timeout = timeout * 60; 476b7e04f8cSWim Van Sebroeck 477b7e04f8cSWim Van Sebroeck return put_user(new_timeout, uarg.i); 478b7e04f8cSWim Van Sebroeck 479b7e04f8cSWim Van Sebroeck case WDIOC_SETOPTIONS: 480b7e04f8cSWim Van Sebroeck { 481b7e04f8cSWim Van Sebroeck int options, retval = -EINVAL; 482b7e04f8cSWim Van Sebroeck 483b7e04f8cSWim Van Sebroeck if (get_user(options, uarg.i)) 484b7e04f8cSWim Van Sebroeck return -EFAULT; 485b7e04f8cSWim Van Sebroeck 486b7e04f8cSWim Van Sebroeck if (options & WDIOS_DISABLECARD) { 487b7e04f8cSWim Van Sebroeck pc87413_disable(); 488b7e04f8cSWim Van Sebroeck retval = 0; 489b7e04f8cSWim Van Sebroeck } 490b7e04f8cSWim Van Sebroeck 491b7e04f8cSWim Van Sebroeck if (options & WDIOS_ENABLECARD) { 492b7e04f8cSWim Van Sebroeck pc87413_enable(); 493b7e04f8cSWim Van Sebroeck retval = 0; 494b7e04f8cSWim Van Sebroeck } 495b7e04f8cSWim Van Sebroeck 496b7e04f8cSWim Van Sebroeck return retval; 497b7e04f8cSWim Van Sebroeck } 498b7e04f8cSWim Van Sebroeck } 499b7e04f8cSWim Van Sebroeck } 500b7e04f8cSWim Van Sebroeck 501b7e04f8cSWim Van Sebroeck /* -- Notifier funtions -----------------------------------------*/ 502b7e04f8cSWim Van Sebroeck 503b7e04f8cSWim Van Sebroeck /** 504b7e04f8cSWim Van Sebroeck * notify_sys: 505b7e04f8cSWim Van Sebroeck * @this: our notifier block 506b7e04f8cSWim Van Sebroeck * @code: the event being reported 507b7e04f8cSWim Van Sebroeck * @unused: unused 508b7e04f8cSWim Van Sebroeck * 509b7e04f8cSWim Van Sebroeck * Our notifier is called on system shutdowns. We want to turn the card 510b7e04f8cSWim Van Sebroeck * off at reboot otherwise the machine will reboot again during memory 511b7e04f8cSWim Van Sebroeck * test or worse yet during the following fsck. This would suck, in fact 512b7e04f8cSWim Van Sebroeck * trust me - if it happens it does suck. 513b7e04f8cSWim Van Sebroeck */ 514b7e04f8cSWim Van Sebroeck 515b7e04f8cSWim Van Sebroeck static int pc87413_notify_sys(struct notifier_block *this, 516b7e04f8cSWim Van Sebroeck unsigned long code, 517b7e04f8cSWim Van Sebroeck void *unused) 518b7e04f8cSWim Van Sebroeck { 519b7e04f8cSWim Van Sebroeck if (code == SYS_DOWN || code == SYS_HALT) 520b7e04f8cSWim Van Sebroeck { 521b7e04f8cSWim Van Sebroeck /* Turn the card off */ 522b7e04f8cSWim Van Sebroeck pc87413_disable(); 523b7e04f8cSWim Van Sebroeck } 524b7e04f8cSWim Van Sebroeck return NOTIFY_DONE; 525b7e04f8cSWim Van Sebroeck } 526b7e04f8cSWim Van Sebroeck 527b7e04f8cSWim Van Sebroeck /* -- Module's structures ---------------------------------------*/ 528b7e04f8cSWim Van Sebroeck 529b7e04f8cSWim Van Sebroeck static const struct file_operations pc87413_fops = { 530b7e04f8cSWim Van Sebroeck .owner = THIS_MODULE, 531b7e04f8cSWim Van Sebroeck .llseek = no_llseek, 532b7e04f8cSWim Van Sebroeck .write = pc87413_write, 533b7e04f8cSWim Van Sebroeck .ioctl = pc87413_ioctl, 534b7e04f8cSWim Van Sebroeck .open = pc87413_open, 535b7e04f8cSWim Van Sebroeck .release = pc87413_release, 536b7e04f8cSWim Van Sebroeck }; 537b7e04f8cSWim Van Sebroeck 538b7e04f8cSWim Van Sebroeck static struct notifier_block pc87413_notifier = 539b7e04f8cSWim Van Sebroeck { 540b7e04f8cSWim Van Sebroeck .notifier_call = pc87413_notify_sys, 541b7e04f8cSWim Van Sebroeck }; 542b7e04f8cSWim Van Sebroeck 543b7e04f8cSWim Van Sebroeck static struct miscdevice pc87413_miscdev= 544b7e04f8cSWim Van Sebroeck { 545b7e04f8cSWim Van Sebroeck .minor = WATCHDOG_MINOR, 546b7e04f8cSWim Van Sebroeck .name = "watchdog", 547b7e04f8cSWim Van Sebroeck .fops = &pc87413_fops 548b7e04f8cSWim Van Sebroeck }; 549b7e04f8cSWim Van Sebroeck 550b7e04f8cSWim Van Sebroeck /* -- Module init functions -------------------------------------*/ 551b7e04f8cSWim Van Sebroeck 552b7e04f8cSWim Van Sebroeck /** 553b7e04f8cSWim Van Sebroeck * pc87413_init: module's "constructor" 554b7e04f8cSWim Van Sebroeck * 555b7e04f8cSWim Van Sebroeck * Set up the WDT watchdog board. All we have to do is grab the 556b7e04f8cSWim Van Sebroeck * resources we require and bitch if anyone beat us to them. 557b7e04f8cSWim Van Sebroeck * The open() function will actually kick the board off. 558b7e04f8cSWim Van Sebroeck */ 559b7e04f8cSWim Van Sebroeck 560b7e04f8cSWim Van Sebroeck static int __init pc87413_init(void) 561b7e04f8cSWim Van Sebroeck { 562b7e04f8cSWim Van Sebroeck int ret; 563b7e04f8cSWim Van Sebroeck 564b7e04f8cSWim Van Sebroeck spin_lock_init(&io_lock); 565b7e04f8cSWim Van Sebroeck 566b7e04f8cSWim Van Sebroeck printk(KERN_INFO PFX "Version " VERSION " at io 0x%X\n", WDT_INDEX_IO_PORT); 567b7e04f8cSWim Van Sebroeck 568b7e04f8cSWim Van Sebroeck /* request_region(io, 2, "pc87413"); */ 569b7e04f8cSWim Van Sebroeck 570b7e04f8cSWim Van Sebroeck ret = register_reboot_notifier(&pc87413_notifier); 571b7e04f8cSWim Van Sebroeck if (ret != 0) { 572b7e04f8cSWim Van Sebroeck printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", 573b7e04f8cSWim Van Sebroeck ret); 574b7e04f8cSWim Van Sebroeck } 575b7e04f8cSWim Van Sebroeck 576b7e04f8cSWim Van Sebroeck ret = misc_register(&pc87413_miscdev); 577b7e04f8cSWim Van Sebroeck 578b7e04f8cSWim Van Sebroeck if (ret != 0) { 579b7e04f8cSWim Van Sebroeck printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", 580b7e04f8cSWim Van Sebroeck WATCHDOG_MINOR, ret); 581b7e04f8cSWim Van Sebroeck unregister_reboot_notifier(&pc87413_notifier); 582b7e04f8cSWim Van Sebroeck return ret; 583b7e04f8cSWim Van Sebroeck } 584b7e04f8cSWim Van Sebroeck 585b7e04f8cSWim Van Sebroeck printk(KERN_INFO PFX "initialized. timeout=%d min \n", timeout); 586b7e04f8cSWim Van Sebroeck 587b7e04f8cSWim Van Sebroeck pc87413_enable(); 588b7e04f8cSWim Van Sebroeck 589b7e04f8cSWim Van Sebroeck return 0; 590b7e04f8cSWim Van Sebroeck } 591b7e04f8cSWim Van Sebroeck 592b7e04f8cSWim Van Sebroeck /** 593b7e04f8cSWim Van Sebroeck * pc87413_exit: module's "destructor" 594b7e04f8cSWim Van Sebroeck * 595b7e04f8cSWim Van Sebroeck * Unload the watchdog. You cannot do this with any file handles open. 596b7e04f8cSWim Van Sebroeck * If your watchdog is set to continue ticking on close and you unload 597b7e04f8cSWim Van Sebroeck * it, well it keeps ticking. We won't get the interrupt but the board 598b7e04f8cSWim Van Sebroeck * will not touch PC memory so all is fine. You just have to load a new 599b7e04f8cSWim Van Sebroeck * module in 60 seconds or reboot. 600b7e04f8cSWim Van Sebroeck */ 601b7e04f8cSWim Van Sebroeck 602b7e04f8cSWim Van Sebroeck static void __exit pc87413_exit(void) 603b7e04f8cSWim Van Sebroeck { 604b7e04f8cSWim Van Sebroeck /* Stop the timer before we leave */ 605b7e04f8cSWim Van Sebroeck if (!nowayout) 606b7e04f8cSWim Van Sebroeck { 607b7e04f8cSWim Van Sebroeck pc87413_disable(); 608b7e04f8cSWim Van Sebroeck printk(KERN_INFO MODNAME "Watchdog disabled.\n"); 609b7e04f8cSWim Van Sebroeck } 610b7e04f8cSWim Van Sebroeck 611b7e04f8cSWim Van Sebroeck misc_deregister(&pc87413_miscdev); 612b7e04f8cSWim Van Sebroeck unregister_reboot_notifier(&pc87413_notifier); 613b7e04f8cSWim Van Sebroeck /* release_region(io,2); */ 614b7e04f8cSWim Van Sebroeck 615b7e04f8cSWim Van Sebroeck printk(MODNAME " watchdog component driver removed.\n"); 616b7e04f8cSWim Van Sebroeck } 617b7e04f8cSWim Van Sebroeck 618b7e04f8cSWim Van Sebroeck module_init(pc87413_init); 619b7e04f8cSWim Van Sebroeck module_exit(pc87413_exit); 620b7e04f8cSWim Van Sebroeck 621b7e04f8cSWim Van Sebroeck MODULE_AUTHOR("Sven Anders <anders@anduras.de>, Marcus Junker <junker@anduras.de>,"); 622b7e04f8cSWim Van Sebroeck MODULE_DESCRIPTION("PC87413 WDT driver"); 623b7e04f8cSWim Van Sebroeck MODULE_LICENSE("GPL"); 624b7e04f8cSWim Van Sebroeck 625b7e04f8cSWim Van Sebroeck MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); 626b7e04f8cSWim Van Sebroeck 627b7e04f8cSWim Van Sebroeck module_param(io, int, 0); 628b7e04f8cSWim Van Sebroeck MODULE_PARM_DESC(io, MODNAME " I/O port (default: " __MODULE_STRING(io) ")."); 629b7e04f8cSWim Van Sebroeck 630b7e04f8cSWim Van Sebroeck module_param(timeout, int, 0); 631b7e04f8cSWim Van Sebroeck MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes (default=" __MODULE_STRING(timeout) ")."); 632b7e04f8cSWim Van Sebroeck 633b7e04f8cSWim Van Sebroeck module_param(nowayout, int, 0); 634b7e04f8cSWim Van Sebroeck MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 635b7e04f8cSWim Van Sebroeck 636