Guenter Roeck | d017327 | 2019-06-20 09:28:46 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 2 | /* |
| 3 | * NS pc87413-wdt Watchdog Timer driver for Linux 2.6.x.x |
| 4 | * |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 5 | * This code is based on wdt.c with original copyright. |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 6 | * |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 7 | * (C) Copyright 2006 Sven Anders, <anders@anduras.de> |
| 8 | * and Marcus Junker, <junker@anduras.de> |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 9 | * |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 10 | * Neither Sven Anders, Marcus Junker nor ANDURAS AG |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 11 | * admit liability nor provide warranty for any of this software. |
| 12 | * This material is provided "AS-IS" and at no charge. |
| 13 | * |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 14 | * Release 1.1 |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 15 | */ |
| 16 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 18 | |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 19 | #include <linux/module.h> |
| 20 | #include <linux/types.h> |
| 21 | #include <linux/miscdevice.h> |
| 22 | #include <linux/watchdog.h> |
| 23 | #include <linux/ioport.h> |
| 24 | #include <linux/delay.h> |
| 25 | #include <linux/notifier.h> |
| 26 | #include <linux/fs.h> |
| 27 | #include <linux/reboot.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/spinlock.h> |
| 30 | #include <linux/moduleparam.h> |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 31 | #include <linux/io.h> |
| 32 | #include <linux/uaccess.h> |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 33 | |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 34 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 35 | /* #define DEBUG 1 */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 36 | |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 37 | #define DEFAULT_TIMEOUT 1 /* 1 minute */ |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 38 | #define MAX_TIMEOUT 255 |
| 39 | |
| 40 | #define VERSION "1.1" |
| 41 | #define MODNAME "pc87413 WDT" |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 42 | #define DPFX MODNAME " - DEBUG: " |
| 43 | |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 44 | #define WDT_INDEX_IO_PORT (io+0) /* I/O port base (index register) */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 45 | #define WDT_DATA_IO_PORT (WDT_INDEX_IO_PORT+1) |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 46 | #define SWC_LDN 0x04 |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 47 | #define SIOCFG2 0x22 /* Serial IO register */ |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 48 | #define WDCTL 0x10 /* Watchdog-Timer-Control-Register */ |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 49 | #define WDTO 0x11 /* Watchdog timeout register */ |
| 50 | #define WDCFG 0x12 /* Watchdog config register */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 51 | |
Randy Dunlap | 76550d3 | 2010-05-01 09:46:15 -0700 | [diff] [blame] | 52 | #define IO_DEFAULT 0x2E /* Address used on Portwell Boards */ |
| 53 | |
| 54 | static int io = IO_DEFAULT; |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 55 | static int swc_base_addr = -1; |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 56 | |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 57 | static int timeout = DEFAULT_TIMEOUT; /* timeout value */ |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 58 | static unsigned long timer_enabled; /* is the timer enabled? */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 59 | |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 60 | static char expect_close; /* is the close expected? */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 61 | |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 62 | static DEFINE_SPINLOCK(io_lock); /* to guard us from io races */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 63 | |
Wim Van Sebroeck | 86a1e18 | 2012-03-05 16:51:11 +0100 | [diff] [blame] | 64 | static bool nowayout = WATCHDOG_NOWAYOUT; |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 65 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 66 | /* -- Low level function ----------------------------------------*/ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 67 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 68 | /* Select pins for Watchdog output */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 69 | |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 70 | static inline void pc87413_select_wdt_out(void) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 71 | { |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 72 | unsigned int cr_data = 0; |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 73 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 74 | /* Step 1: Select multiple pin,pin55,as WDT output */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 75 | |
| 76 | outb_p(SIOCFG2, WDT_INDEX_IO_PORT); |
| 77 | |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 78 | cr_data = inb(WDT_DATA_IO_PORT); |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 79 | |
| 80 | cr_data |= 0x80; /* Set Bit7 to 1*/ |
| 81 | outb_p(SIOCFG2, WDT_INDEX_IO_PORT); |
| 82 | |
| 83 | outb_p(cr_data, WDT_DATA_IO_PORT); |
| 84 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 85 | #ifdef DEBUG |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 86 | pr_info(DPFX |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 87 | "Select multiple pin,pin55,as WDT output: Bit7 to 1: %d\n", |
| 88 | cr_data); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 89 | #endif |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 90 | } |
| 91 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 92 | /* Enable SWC functions */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 93 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 94 | static inline void pc87413_enable_swc(void) |
| 95 | { |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 96 | unsigned int cr_data = 0; |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 97 | |
| 98 | /* Step 2: Enable SWC functions */ |
| 99 | |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 100 | outb_p(0x07, WDT_INDEX_IO_PORT); /* Point SWC_LDN (LDN=4) */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 101 | outb_p(SWC_LDN, WDT_DATA_IO_PORT); |
| 102 | |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 103 | outb_p(0x30, WDT_INDEX_IO_PORT); /* Read Index 0x30 First */ |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 104 | cr_data = inb(WDT_DATA_IO_PORT); |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 105 | cr_data |= 0x01; /* Set Bit0 to 1 */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 106 | outb_p(0x30, WDT_INDEX_IO_PORT); |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 107 | outb_p(cr_data, WDT_DATA_IO_PORT); /* Index0x30_bit0P1 */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 108 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 109 | #ifdef DEBUG |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 110 | pr_info(DPFX "pc87413 - Enable SWC functions\n"); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 111 | #endif |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 112 | } |
| 113 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 114 | /* Read SWC I/O base address */ |
| 115 | |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 116 | static void pc87413_get_swc_base_addr(void) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 117 | { |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 118 | unsigned char addr_l, addr_h = 0; |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 119 | |
| 120 | /* Step 3: Read SWC I/O Base Address */ |
| 121 | |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 122 | outb_p(0x60, WDT_INDEX_IO_PORT); /* Read Index 0x60 */ |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 123 | addr_h = inb(WDT_DATA_IO_PORT); |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 124 | |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 125 | outb_p(0x61, WDT_INDEX_IO_PORT); /* Read Index 0x61 */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 126 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 127 | addr_l = inb(WDT_DATA_IO_PORT); |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 128 | |
| 129 | swc_base_addr = (addr_h << 8) + addr_l; |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 130 | #ifdef DEBUG |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 131 | pr_info(DPFX |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 132 | "Read SWC I/O Base Address: low %d, high %d, res %d\n", |
| 133 | addr_l, addr_h, swc_base_addr); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 134 | #endif |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 135 | } |
| 136 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 137 | /* Select Bank 3 of SWC */ |
| 138 | |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 139 | static inline void pc87413_swc_bank3(void) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 140 | { |
| 141 | /* Step 4: Select Bank3 of SWC */ |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 142 | outb_p(inb(swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 143 | #ifdef DEBUG |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 144 | pr_info(DPFX "Select Bank3 of SWC\n"); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 145 | #endif |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 146 | } |
| 147 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 148 | /* Set watchdog timeout to x minutes */ |
| 149 | |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 150 | static inline void pc87413_programm_wdto(char pc87413_time) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 151 | { |
| 152 | /* Step 5: Programm WDTO, Twd. */ |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 153 | outb_p(pc87413_time, swc_base_addr + WDTO); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 154 | #ifdef DEBUG |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 155 | pr_info(DPFX "Set WDTO to %d minutes\n", pc87413_time); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 156 | #endif |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 157 | } |
| 158 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 159 | /* Enable WDEN */ |
| 160 | |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 161 | static inline void pc87413_enable_wden(void) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 162 | { |
| 163 | /* Step 6: Enable WDEN */ |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 164 | outb_p(inb(swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 165 | #ifdef DEBUG |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 166 | pr_info(DPFX "Enable WDEN\n"); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 167 | #endif |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 168 | } |
| 169 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 170 | /* Enable SW_WD_TREN */ |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 171 | static inline void pc87413_enable_sw_wd_tren(void) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 172 | { |
| 173 | /* Enable SW_WD_TREN */ |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 174 | outb_p(inb(swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 175 | #ifdef DEBUG |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 176 | pr_info(DPFX "Enable SW_WD_TREN\n"); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 177 | #endif |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 178 | } |
| 179 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 180 | /* Disable SW_WD_TREN */ |
| 181 | |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 182 | static inline void pc87413_disable_sw_wd_tren(void) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 183 | { |
| 184 | /* Disable SW_WD_TREN */ |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 185 | outb_p(inb(swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 186 | #ifdef DEBUG |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 187 | pr_info(DPFX "pc87413 - Disable SW_WD_TREN\n"); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 188 | #endif |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 189 | } |
| 190 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 191 | /* Enable SW_WD_TRG */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 192 | |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 193 | static inline void pc87413_enable_sw_wd_trg(void) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 194 | { |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 195 | /* Enable SW_WD_TRG */ |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 196 | outb_p(inb(swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 197 | #ifdef DEBUG |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 198 | pr_info(DPFX "pc87413 - Enable SW_WD_TRG\n"); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 199 | #endif |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 200 | } |
| 201 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 202 | /* Disable SW_WD_TRG */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 203 | |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 204 | static inline void pc87413_disable_sw_wd_trg(void) |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 205 | { |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 206 | /* Disable SW_WD_TRG */ |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 207 | outb_p(inb(swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 208 | #ifdef DEBUG |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 209 | pr_info(DPFX "Disable SW_WD_TRG\n"); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 210 | #endif |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 211 | } |
| 212 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 213 | /* -- Higher level functions ------------------------------------*/ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 214 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 215 | /* Enable the watchdog */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 216 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 217 | static void pc87413_enable(void) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 218 | { |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 219 | spin_lock(&io_lock); |
| 220 | |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 221 | pc87413_swc_bank3(); |
| 222 | pc87413_programm_wdto(timeout); |
| 223 | pc87413_enable_wden(); |
| 224 | pc87413_enable_sw_wd_tren(); |
| 225 | pc87413_enable_sw_wd_trg(); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 226 | |
| 227 | spin_unlock(&io_lock); |
| 228 | } |
| 229 | |
| 230 | /* Disable the watchdog */ |
| 231 | |
| 232 | static void pc87413_disable(void) |
| 233 | { |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 234 | spin_lock(&io_lock); |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 235 | |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 236 | pc87413_swc_bank3(); |
| 237 | pc87413_disable_sw_wd_tren(); |
| 238 | pc87413_disable_sw_wd_trg(); |
| 239 | pc87413_programm_wdto(0); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 240 | |
| 241 | spin_unlock(&io_lock); |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 242 | } |
| 243 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 244 | /* Refresh the watchdog */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 245 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 246 | static void pc87413_refresh(void) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 247 | { |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 248 | spin_lock(&io_lock); |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 249 | |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 250 | pc87413_swc_bank3(); |
| 251 | pc87413_disable_sw_wd_tren(); |
| 252 | pc87413_disable_sw_wd_trg(); |
| 253 | pc87413_programm_wdto(timeout); |
| 254 | pc87413_enable_wden(); |
| 255 | pc87413_enable_sw_wd_tren(); |
| 256 | pc87413_enable_sw_wd_trg(); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 257 | |
| 258 | spin_unlock(&io_lock); |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 259 | } |
| 260 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 261 | /* -- File operations -------------------------------------------*/ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 262 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 263 | /** |
| 264 | * pc87413_open: |
| 265 | * @inode: inode of device |
| 266 | * @file: file handle to device |
| 267 | * |
| 268 | */ |
| 269 | |
| 270 | static int pc87413_open(struct inode *inode, struct file *file) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 271 | { |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 272 | /* /dev/watchdog can only be opened once */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 273 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 274 | if (test_and_set_bit(0, &timer_enabled)) |
| 275 | return -EBUSY; |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 276 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 277 | if (nowayout) |
| 278 | __module_get(THIS_MODULE); |
| 279 | |
| 280 | /* Reload and activate timer */ |
| 281 | pc87413_refresh(); |
| 282 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 283 | pr_info("Watchdog enabled. Timeout set to %d minute(s).\n", timeout); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 284 | |
Kirill Smelkov | c5bf68f | 2019-03-26 23:51:19 +0300 | [diff] [blame] | 285 | return stream_open(inode, file); |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 286 | } |
| 287 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 288 | /** |
| 289 | * pc87413_release: |
| 290 | * @inode: inode to board |
| 291 | * @file: file handle to board |
| 292 | * |
| 293 | * The watchdog has a configurable API. There is a religious dispute |
| 294 | * between people who want their watchdog to be able to shut down and |
| 295 | * those who want to be sure if the watchdog manager dies the machine |
| 296 | * reboots. In the former case we disable the counters, in the latter |
| 297 | * case you have to open it again very soon. |
| 298 | */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 299 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 300 | static int pc87413_release(struct inode *inode, struct file *file) |
| 301 | { |
| 302 | /* Shut off the timer. */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 303 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 304 | if (expect_close == 42) { |
| 305 | pc87413_disable(); |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 306 | pr_info("Watchdog disabled, sleeping again...\n"); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 307 | } else { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 308 | pr_crit("Unexpected close, not stopping watchdog!\n"); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 309 | pc87413_refresh(); |
| 310 | } |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 311 | clear_bit(0, &timer_enabled); |
| 312 | expect_close = 0; |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 313 | return 0; |
| 314 | } |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 315 | |
| 316 | /** |
| 317 | * pc87413_status: |
| 318 | * |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 319 | * return, if the watchdog is enabled (timeout is set...) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 320 | */ |
| 321 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 322 | |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 323 | static int pc87413_status(void) |
| 324 | { |
Wim Van Sebroeck | 0835caa | 2006-10-23 18:21:52 +0200 | [diff] [blame] | 325 | return 0; /* currently not supported */ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 326 | } |
| 327 | |
| 328 | /** |
| 329 | * pc87413_write: |
| 330 | * @file: file handle to the watchdog |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 331 | * @data: data buffer to write |
| 332 | * @len: length in bytes |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 333 | * @ppos: pointer to the position to write. No seeks allowed |
| 334 | * |
| 335 | * A write to a watchdog device is defined as a keepalive signal. Any |
| 336 | * write of data will do, as we we don't define content meaning. |
| 337 | */ |
| 338 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 339 | static ssize_t pc87413_write(struct file *file, const char __user *data, |
| 340 | size_t len, loff_t *ppos) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 341 | { |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 342 | /* See if we got the magic character 'V' and reload the timer */ |
| 343 | if (len) { |
| 344 | if (!nowayout) { |
| 345 | size_t i; |
| 346 | |
| 347 | /* reset expect flag */ |
| 348 | expect_close = 0; |
| 349 | |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 350 | /* scan to see whether or not we got the |
| 351 | magic character */ |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 352 | for (i = 0; i != len; i++) { |
| 353 | char c; |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 354 | if (get_user(c, data + i)) |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 355 | return -EFAULT; |
| 356 | if (c == 'V') |
| 357 | expect_close = 42; |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | /* someone wrote to us, we should reload the timer */ |
| 362 | pc87413_refresh(); |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 363 | } |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 364 | return len; |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 365 | } |
| 366 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 367 | /** |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 368 | * pc87413_ioctl: |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 369 | * @file: file handle to the device |
| 370 | * @cmd: watchdog command |
| 371 | * @arg: argument pointer |
| 372 | * |
| 373 | * The watchdog API defines a common set of functions for all watchdogs |
| 374 | * according to their available features. We only actually usefully support |
| 375 | * querying capabilities and current status. |
| 376 | */ |
| 377 | |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 378 | static long pc87413_ioctl(struct file *file, unsigned int cmd, |
| 379 | unsigned long arg) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 380 | { |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 381 | int new_timeout; |
| 382 | |
| 383 | union { |
| 384 | struct watchdog_info __user *ident; |
| 385 | int __user *i; |
| 386 | } uarg; |
| 387 | |
Wim Van Sebroeck | 42747d7 | 2009-12-26 18:55:22 +0000 | [diff] [blame] | 388 | static const struct watchdog_info ident = { |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 389 | .options = WDIOF_KEEPALIVEPING | |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 390 | WDIOF_SETTIMEOUT | |
| 391 | WDIOF_MAGICCLOSE, |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 392 | .firmware_version = 1, |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 393 | .identity = "PC87413(HF/F) watchdog", |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 394 | }; |
| 395 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 396 | uarg.i = (int __user *)arg; |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 397 | |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 398 | switch (cmd) { |
| 399 | case WDIOC_GETSUPPORT: |
| 400 | return copy_to_user(uarg.ident, &ident, |
| 401 | sizeof(ident)) ? -EFAULT : 0; |
| 402 | case WDIOC_GETSTATUS: |
| 403 | return put_user(pc87413_status(), uarg.i); |
| 404 | case WDIOC_GETBOOTSTATUS: |
| 405 | return put_user(0, uarg.i); |
Wim Van Sebroeck | 0c06090 | 2008-07-18 11:41:17 +0000 | [diff] [blame] | 406 | case WDIOC_SETOPTIONS: |
| 407 | { |
| 408 | int options, retval = -EINVAL; |
| 409 | if (get_user(options, uarg.i)) |
| 410 | return -EFAULT; |
| 411 | if (options & WDIOS_DISABLECARD) { |
| 412 | pc87413_disable(); |
| 413 | retval = 0; |
| 414 | } |
| 415 | if (options & WDIOS_ENABLECARD) { |
| 416 | pc87413_enable(); |
| 417 | retval = 0; |
| 418 | } |
| 419 | return retval; |
| 420 | } |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 421 | case WDIOC_KEEPALIVE: |
| 422 | pc87413_refresh(); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 423 | #ifdef DEBUG |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 424 | pr_info(DPFX "keepalive\n"); |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 425 | #endif |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 426 | return 0; |
| 427 | case WDIOC_SETTIMEOUT: |
| 428 | if (get_user(new_timeout, uarg.i)) |
| 429 | return -EFAULT; |
| 430 | /* the API states this is given in secs */ |
| 431 | new_timeout /= 60; |
| 432 | if (new_timeout < 0 || new_timeout > MAX_TIMEOUT) |
| 433 | return -EINVAL; |
| 434 | timeout = new_timeout; |
| 435 | pc87413_refresh(); |
Gustavo A. R. Silva | bd490f8 | 2020-07-07 12:11:21 -0500 | [diff] [blame] | 436 | fallthrough; /* and return the new timeout */ |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 437 | case WDIOC_GETTIMEOUT: |
| 438 | new_timeout = timeout * 60; |
| 439 | return put_user(new_timeout, uarg.i); |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 440 | default: |
| 441 | return -ENOTTY; |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 442 | } |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 443 | } |
| 444 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 445 | /* -- Notifier funtions -----------------------------------------*/ |
| 446 | |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 447 | /** |
| 448 | * notify_sys: |
| 449 | * @this: our notifier block |
| 450 | * @code: the event being reported |
| 451 | * @unused: unused |
| 452 | * |
| 453 | * Our notifier is called on system shutdowns. We want to turn the card |
| 454 | * off at reboot otherwise the machine will reboot again during memory |
| 455 | * test or worse yet during the following fsck. This would suck, in fact |
| 456 | * trust me - if it happens it does suck. |
| 457 | */ |
| 458 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 459 | static int pc87413_notify_sys(struct notifier_block *this, |
| 460 | unsigned long code, |
| 461 | void *unused) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 462 | { |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 463 | if (code == SYS_DOWN || code == SYS_HALT) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 464 | /* Turn the card off */ |
| 465 | pc87413_disable(); |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 466 | return NOTIFY_DONE; |
| 467 | } |
| 468 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 469 | /* -- Module's structures ---------------------------------------*/ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 470 | |
Arjan van de Ven | 2b8693c | 2007-02-12 00:55:32 -0800 | [diff] [blame] | 471 | static const struct file_operations pc87413_fops = { |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 472 | .owner = THIS_MODULE, |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 473 | .llseek = no_llseek, |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 474 | .write = pc87413_write, |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 475 | .unlocked_ioctl = pc87413_ioctl, |
Arnd Bergmann | b6dfb24 | 2019-06-03 14:23:09 +0200 | [diff] [blame] | 476 | .compat_ioctl = compat_ptr_ioctl, |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 477 | .open = pc87413_open, |
| 478 | .release = pc87413_release, |
| 479 | }; |
| 480 | |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 481 | static struct notifier_block pc87413_notifier = { |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 482 | .notifier_call = pc87413_notify_sys, |
| 483 | }; |
| 484 | |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 485 | static struct miscdevice pc87413_miscdev = { |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 486 | .minor = WATCHDOG_MINOR, |
| 487 | .name = "watchdog", |
Wim Van Sebroeck | 7944d3a | 2008-08-06 20:19:41 +0000 | [diff] [blame] | 488 | .fops = &pc87413_fops, |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 489 | }; |
| 490 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 491 | /* -- Module init functions -------------------------------------*/ |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 492 | |
| 493 | /** |
Wim Van Sebroeck | 5f3b275 | 2011-02-23 20:04:38 +0000 | [diff] [blame] | 494 | * pc87413_init: module's "constructor" |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 495 | * |
| 496 | * Set up the WDT watchdog board. All we have to do is grab the |
| 497 | * resources we require and bitch if anyone beat us to them. |
| 498 | * The open() function will actually kick the board off. |
| 499 | */ |
| 500 | |
| 501 | static int __init pc87413_init(void) |
| 502 | { |
| 503 | int ret; |
| 504 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 505 | pr_info("Version " VERSION " at io 0x%X\n", |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 506 | WDT_INDEX_IO_PORT); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 507 | |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 508 | if (!request_muxed_region(io, 2, MODNAME)) |
| 509 | return -EBUSY; |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 510 | |
| 511 | ret = register_reboot_notifier(&pc87413_notifier); |
Jingoo Han | 5f5e190 | 2014-02-27 14:41:42 +0900 | [diff] [blame] | 512 | if (ret != 0) |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 513 | pr_err("cannot register reboot notifier (err=%d)\n", ret); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 514 | |
| 515 | ret = misc_register(&pc87413_miscdev); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 516 | if (ret != 0) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 517 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
| 518 | WATCHDOG_MINOR, ret); |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 519 | goto reboot_unreg; |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 520 | } |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 521 | pr_info("initialized. timeout=%d min\n", timeout); |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 522 | |
| 523 | pc87413_select_wdt_out(); |
| 524 | pc87413_enable_swc(); |
| 525 | pc87413_get_swc_base_addr(); |
| 526 | |
| 527 | if (!request_region(swc_base_addr, 0x20, MODNAME)) { |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 528 | pr_err("cannot request SWC region at 0x%x\n", swc_base_addr); |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 529 | ret = -EBUSY; |
| 530 | goto misc_unreg; |
| 531 | } |
| 532 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 533 | pc87413_enable(); |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 534 | |
| 535 | release_region(io, 2); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 536 | return 0; |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 537 | |
| 538 | misc_unreg: |
| 539 | misc_deregister(&pc87413_miscdev); |
| 540 | reboot_unreg: |
| 541 | unregister_reboot_notifier(&pc87413_notifier); |
| 542 | release_region(io, 2); |
| 543 | return ret; |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 544 | } |
| 545 | |
| 546 | /** |
| 547 | * pc87413_exit: module's "destructor" |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 548 | * |
| 549 | * Unload the watchdog. You cannot do this with any file handles open. |
| 550 | * If your watchdog is set to continue ticking on close and you unload |
| 551 | * it, well it keeps ticking. We won't get the interrupt but the board |
| 552 | * will not touch PC memory so all is fine. You just have to load a new |
| 553 | * module in 60 seconds or reboot. |
| 554 | */ |
| 555 | |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 556 | static void __exit pc87413_exit(void) |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 557 | { |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 558 | /* Stop the timer before we leave */ |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 559 | if (!nowayout) { |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 560 | pc87413_disable(); |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 561 | pr_info("Watchdog disabled\n"); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 562 | } |
| 563 | |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 564 | misc_deregister(&pc87413_miscdev); |
| 565 | unregister_reboot_notifier(&pc87413_notifier); |
Jonathan McDowell | 7ccdb94 | 2011-04-14 12:02:39 -0700 | [diff] [blame] | 566 | release_region(swc_base_addr, 0x20); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 567 | |
Joe Perches | 27c766a | 2012-02-15 15:06:19 -0800 | [diff] [blame] | 568 | pr_info("watchdog component driver removed\n"); |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 569 | } |
| 570 | |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 571 | module_init(pc87413_init); |
| 572 | module_exit(pc87413_exit); |
| 573 | |
Jingoo Han | 5f5e190 | 2014-02-27 14:41:42 +0900 | [diff] [blame] | 574 | MODULE_AUTHOR("Sven Anders <anders@anduras.de>"); |
| 575 | MODULE_AUTHOR("Marcus Junker <junker@anduras.de>"); |
Sven Anders & Marcus Junker | 789fc0a | 2006-08-24 17:11:50 +0200 | [diff] [blame] | 576 | MODULE_DESCRIPTION("PC87413 WDT driver"); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 577 | MODULE_LICENSE("GPL"); |
| 578 | |
David Howells | 5d1c93c | 2017-04-04 16:54:29 +0100 | [diff] [blame] | 579 | module_param_hw(io, int, ioport, 0); |
Randy Dunlap | 76550d3 | 2010-05-01 09:46:15 -0700 | [diff] [blame] | 580 | MODULE_PARM_DESC(io, MODNAME " I/O port (default: " |
| 581 | __MODULE_STRING(IO_DEFAULT) ")."); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 582 | |
| 583 | module_param(timeout, int, 0); |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 584 | MODULE_PARM_DESC(timeout, |
| 585 | "Watchdog timeout in minutes (default=" |
Randy Dunlap | 76550d3 | 2010-05-01 09:46:15 -0700 | [diff] [blame] | 586 | __MODULE_STRING(DEFAULT_TIMEOUT) ")."); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 587 | |
Wim Van Sebroeck | 86a1e18 | 2012-03-05 16:51:11 +0100 | [diff] [blame] | 588 | module_param(nowayout, bool, 0); |
Alan Cox | aee334c | 2008-05-19 14:07:37 +0100 | [diff] [blame] | 589 | MODULE_PARM_DESC(nowayout, |
| 590 | "Watchdog cannot be stopped once started (default=" |
| 591 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
Sven Anders & Marcus Junker | 00b3b3e | 2006-10-16 18:18:09 +0200 | [diff] [blame] | 592 | |