^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * SMsC 37B787 Watchdog Timer driver for Linux 2.6.x.x
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Based on acquirewdt.c by Alan Cox <alan@lxorguk.ukuu.org.uk>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * and some other existing drivers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * The authors do NOT admit liability nor provide warranty for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * any of this software. This material is provided "AS-IS" in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * the hope that it may be useful for others.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * (C) Copyright 2003-2006 Sven Anders <anders@anduras.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * History:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * 2003 - Created version 1.0 for Linux 2.4.x.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * 2006 - Ported to Linux 2.6, added nowayout and MAGICCLOSE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * features. Released version 1.1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * Theory of operation:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * A Watchdog Timer (WDT) is a hardware circuit that can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * reset the computer system in case of a software fault.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * You probably knew that already.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * Usually a userspace daemon will notify the kernel WDT driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * via the /dev/watchdog special device file that userspace is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * still alive, at regular intervals. When such a notification
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * occurs, the driver will usually tell the hardware watchdog
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * that everything is in order, and that the watchdog should wait
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * for yet another little while to reset the system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * If userspace fails (RAM error, kernel bug, whatever), the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * notifications cease to occur, and the hardware watchdog will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * reset the system (causing a reboot) after the timeout occurs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * Create device with:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * mknod /dev/watchdog c 10 130
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * For an example userspace keep-alive daemon, see:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * Documentation/watchdog/wdt.rst
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #include <linux/ioport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) /* enable support for minutes as units? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) /* (does not always work correctly, so disabled by default!) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) #define SMSC_SUPPORT_MINUTES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) #undef SMSC_SUPPORT_MINUTES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #define MAX_TIMEOUT 255
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #define UNIT_SECOND 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #define UNIT_MINUTE 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) #define VERSION "1.1"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) #define IOPORT 0x3F0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) #define IOPORT_SIZE 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) #define IODEV_NO 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) static int unit = UNIT_SECOND; /* timer's unit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) static int timeout = 60; /* timeout value: default is 60 "units" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static unsigned long timer_enabled; /* is the timer enabled? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static char expect_close; /* is the close expected? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static DEFINE_SPINLOCK(io_lock);/* to guard the watchdog from io races */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) /* -- Low level function ----------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) /* unlock the IO chip */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) static inline void open_io_config(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) outb(0x55, IOPORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) mdelay(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) outb(0x55, IOPORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /* lock the IO chip */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) static inline void close_io_config(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) outb(0xAA, IOPORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) /* select the IO device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static inline void select_io_device(unsigned char devno)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) outb(0x07, IOPORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) outb(devno, IOPORT+1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) /* write to the control register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static inline void write_io_cr(unsigned char reg, unsigned char data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) outb(reg, IOPORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) outb(data, IOPORT+1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) /* read from the control register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static inline char read_io_cr(unsigned char reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) outb(reg, IOPORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return inb(IOPORT+1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) /* -- Medium level functions ------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static inline void gpio_bit12(unsigned char reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) /* -- General Purpose I/O Bit 1.2 --
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) * Bit 0, In/Out: 0 = Output, 1 = Input
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) * Bit 1, Polarity: 0 = No Invert, 1 = Invert
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) * Bit 2, Group Enable Intr.: 0 = Disable, 1 = Enable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * Bit 3/4, Function select: 00 = GPI/O, 01 = WDT, 10 = P17,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) * 11 = Either Edge Triggered Intr. 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * Bit 5/6 (Reserved)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) * Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) write_io_cr(0xE2, reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) static inline void gpio_bit13(unsigned char reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) /* -- General Purpose I/O Bit 1.3 --
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) * Bit 0, In/Out: 0 = Output, 1 = Input
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) * Bit 1, Polarity: 0 = No Invert, 1 = Invert
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) * Bit 2, Group Enable Intr.: 0 = Disable, 1 = Enable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * Bit 3, Function select: 0 = GPI/O, 1 = LED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) * Bit 4-6 (Reserved)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) * Bit 7, Output Type: 0 = Push Pull Bit, 1 = Open Drain
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) write_io_cr(0xE3, reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static inline void wdt_timer_units(unsigned char new_units)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) /* -- Watchdog timer units --
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) * Bit 0-6 (Reserved)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) * Bit 7, WDT Time-out Value Units Select
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) * (0 = Minutes, 1 = Seconds)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) write_io_cr(0xF1, new_units);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static inline void wdt_timeout_value(unsigned char new_timeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /* -- Watchdog Timer Time-out Value --
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * Bit 0-7 Binary coded units (0=Disabled, 1..255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) write_io_cr(0xF2, new_timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) static inline void wdt_timer_conf(unsigned char conf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) /* -- Watchdog timer configuration --
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * Bit 0 Joystick enable: 0* = No Reset, 1 = Reset WDT upon
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) * Gameport I/O
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) * Bit 1 Keyboard enable: 0* = No Reset, 1 = Reset WDT upon KBD Intr.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * Bit 2 Mouse enable: 0* = No Reset, 1 = Reset WDT upon Mouse Intr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * Bit 3 Reset the timer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * (Wrong in SMsC documentation? Given as: PowerLED Timout
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) * Enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * Bit 4-7 WDT Interrupt Mapping: (0000* = Disabled,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) * 0001=IRQ1, 0010=(Invalid), 0011=IRQ3 to 1111=IRQ15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) write_io_cr(0xF3, conf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) static inline void wdt_timer_ctrl(unsigned char reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) /* -- Watchdog timer control --
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * Bit 0 Status Bit: 0 = Timer counting, 1 = Timeout occurred
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) * Bit 1 Power LED Toggle: 0 = Disable Toggle, 1 = Toggle at 1 Hz
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) * Bit 2 Force Timeout: 1 = Forces WD timeout event (self-cleaning)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) * Bit 3 P20 Force Timeout enabled:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) * 0 = P20 activity does not generate the WD timeout event
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) * 1 = P20 Allows rising edge of P20, from the keyboard
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) * controller, to force the WD timeout event.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) * Bit 4 (Reserved)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) * -- Soft power management --
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) * Bit 5 Stop Counter: 1 = Stop software power down counter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) * set via register 0xB8, (self-cleaning)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) * (Upon read: 0 = Counter running, 1 = Counter stopped)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) * Bit 6 Restart Counter: 1 = Restart software power down counter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) * set via register 0xB8, (self-cleaning)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * Bit 7 SPOFF: 1 = Force software power down (self-cleaning)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) write_io_cr(0xF4, reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) /* -- Higher level functions ------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) /* initialize watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static void wb_smsc_wdt_initialize(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) unsigned char old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) spin_lock(&io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) open_io_config();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) select_io_device(IODEV_NO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) /* enable the watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) gpio_bit13(0x08); /* Select pin 80 = LED not GPIO */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) gpio_bit12(0x0A); /* Set pin 79 = WDT not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) GPIO/Output/Polarity=Invert */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) /* disable the timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) wdt_timeout_value(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) /* reset control register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) wdt_timer_ctrl(0x00);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) /* reset configuration register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) wdt_timer_conf(0x00);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) /* read old (timer units) register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) old = read_io_cr(0xF1) & 0x7F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (unit == UNIT_SECOND)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) old |= 0x80; /* set to seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) /* set the watchdog timer units */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) wdt_timer_units(old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) close_io_config();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) spin_unlock(&io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) /* shutdown the watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) static void wb_smsc_wdt_shutdown(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) spin_lock(&io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) open_io_config();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) select_io_device(IODEV_NO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) /* disable the watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) gpio_bit13(0x09);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) gpio_bit12(0x09);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) /* reset watchdog config register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) wdt_timer_conf(0x00);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) /* reset watchdog control register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) wdt_timer_ctrl(0x00);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) /* disable timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) wdt_timeout_value(0x00);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) close_io_config();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) spin_unlock(&io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) /* set timeout => enable watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) static void wb_smsc_wdt_set_timeout(unsigned char new_timeout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) spin_lock(&io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) open_io_config();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) select_io_device(IODEV_NO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) /* set Power LED to blink, if we enable the timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) wdt_timer_ctrl((new_timeout == 0) ? 0x00 : 0x02);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) /* set timeout value */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) wdt_timeout_value(new_timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) close_io_config();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) spin_unlock(&io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /* get timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) static unsigned char wb_smsc_wdt_get_timeout(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) unsigned char set_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) spin_lock(&io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) open_io_config();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) select_io_device(IODEV_NO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) set_timeout = read_io_cr(0xF2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) close_io_config();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) spin_unlock(&io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return set_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) /* disable watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) static void wb_smsc_wdt_disable(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) /* set the timeout to 0 to disable the watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) wb_smsc_wdt_set_timeout(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) /* enable watchdog by setting the current timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) static void wb_smsc_wdt_enable(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) /* set the current timeout... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) wb_smsc_wdt_set_timeout(timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) /* reset the timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) static void wb_smsc_wdt_reset_timer(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) spin_lock(&io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) open_io_config();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) select_io_device(IODEV_NO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) /* reset the timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) wdt_timeout_value(timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) wdt_timer_conf(0x08);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) close_io_config();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) spin_unlock(&io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) /* return, if the watchdog is enabled (timeout is set...) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) static int wb_smsc_wdt_status(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) return (wb_smsc_wdt_get_timeout() == 0) ? 0 : WDIOF_KEEPALIVEPING;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) /* -- File operations -------------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) /* open => enable watchdog and set initial timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) static int wb_smsc_wdt_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) /* /dev/watchdog can only be opened once */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) if (test_and_set_bit(0, &timer_enabled))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) if (nowayout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) __module_get(THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) /* Reload and activate timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) wb_smsc_wdt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) pr_info("Watchdog enabled. Timeout set to %d %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) timeout, (unit == UNIT_SECOND) ? "second(s)" : "minute(s)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) return stream_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) /* close => shut off the timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) static int wb_smsc_wdt_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) /* Shut off the timer. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) if (expect_close == 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) wb_smsc_wdt_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) pr_info("Watchdog disabled, sleeping again...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) pr_crit("Unexpected close, not stopping watchdog!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) wb_smsc_wdt_reset_timer();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) clear_bit(0, &timer_enabled);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) expect_close = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) /* write => update the timer to keep the machine alive */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) static ssize_t wb_smsc_wdt_write(struct file *file, const char __user *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) size_t len, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) /* See if we got the magic character 'V' and reload the timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) if (len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) if (!nowayout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) size_t i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) /* reset expect flag */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) expect_close = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) /* scan to see whether or not we got the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) magic character */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) for (i = 0; i != len; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) char c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) if (get_user(c, data + i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) if (c == 'V')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) expect_close = 42;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) /* someone wrote to us, we should reload the timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) wb_smsc_wdt_reset_timer();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) /* ioctl => control interface */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) static long wb_smsc_wdt_ioctl(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) unsigned int cmd, unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) int new_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) struct watchdog_info __user *ident;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) int __user *i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) } uarg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) static const struct watchdog_info ident = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) .options = WDIOF_KEEPALIVEPING |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) WDIOF_SETTIMEOUT |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) WDIOF_MAGICCLOSE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) .firmware_version = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) .identity = "SMsC 37B787 Watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) uarg.i = (int __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) case WDIOC_GETSUPPORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) return copy_to_user(uarg.ident, &ident, sizeof(ident))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) case WDIOC_GETSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) return put_user(wb_smsc_wdt_status(), uarg.i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) case WDIOC_GETBOOTSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) return put_user(0, uarg.i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) case WDIOC_SETOPTIONS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) int options, retval = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) if (get_user(options, uarg.i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) if (options & WDIOS_DISABLECARD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) wb_smsc_wdt_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) if (options & WDIOS_ENABLECARD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) wb_smsc_wdt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) case WDIOC_KEEPALIVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) wb_smsc_wdt_reset_timer();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) case WDIOC_SETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) if (get_user(new_timeout, uarg.i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) /* the API states this is given in secs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) if (unit == UNIT_MINUTE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) new_timeout /= 60;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) if (new_timeout < 0 || new_timeout > MAX_TIMEOUT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) timeout = new_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) wb_smsc_wdt_set_timeout(timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) fallthrough; /* and return the new timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) case WDIOC_GETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) new_timeout = timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) if (unit == UNIT_MINUTE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) new_timeout *= 60;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) return put_user(new_timeout, uarg.i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) /* -- Notifier funtions -----------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) static int wb_smsc_wdt_notify_sys(struct notifier_block *this,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) unsigned long code, void *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) if (code == SYS_DOWN || code == SYS_HALT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) /* set timeout to 0, to avoid possible race-condition */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) timeout = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) wb_smsc_wdt_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) /* -- Module's structures ---------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) static const struct file_operations wb_smsc_wdt_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) .llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) .write = wb_smsc_wdt_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) .unlocked_ioctl = wb_smsc_wdt_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) .compat_ioctl = compat_ptr_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) .open = wb_smsc_wdt_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) .release = wb_smsc_wdt_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) static struct notifier_block wb_smsc_wdt_notifier = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) .notifier_call = wb_smsc_wdt_notify_sys,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) static struct miscdevice wb_smsc_wdt_miscdev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) .minor = WATCHDOG_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) .name = "watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) .fops = &wb_smsc_wdt_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) /* -- Module init functions -------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) /* module's "constructor" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) static int __init wb_smsc_wdt_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) pr_info("SMsC 37B787 watchdog component driver "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) VERSION " initialising...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) if (!request_region(IOPORT, IOPORT_SIZE, "SMsC 37B787 watchdog")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) pr_err("Unable to register IO port %#x\n", IOPORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) goto out_pnp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) /* set new maximum, if it's too big */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) if (timeout > MAX_TIMEOUT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) timeout = MAX_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) /* init the watchdog timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) wb_smsc_wdt_initialize();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) ret = register_reboot_notifier(&wb_smsc_wdt_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) pr_err("Unable to register reboot notifier err = %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) goto out_io;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) ret = misc_register(&wb_smsc_wdt_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) pr_err("Unable to register miscdev on minor %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) WATCHDOG_MINOR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) goto out_rbt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) /* output info */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) pr_info("Timeout set to %d %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) timeout, (unit == UNIT_SECOND) ? "second(s)" : "minute(s)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) pr_info("Watchdog initialized and sleeping (nowayout=%d)...\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) nowayout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) out_clean:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) out_rbt:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) unregister_reboot_notifier(&wb_smsc_wdt_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) out_io:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) release_region(IOPORT, IOPORT_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) out_pnp:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) goto out_clean;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) /* module's "destructor" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) static void __exit wb_smsc_wdt_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) /* Stop the timer before we leave */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) if (!nowayout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) wb_smsc_wdt_shutdown();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) pr_info("Watchdog disabled\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) misc_deregister(&wb_smsc_wdt_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) unregister_reboot_notifier(&wb_smsc_wdt_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) release_region(IOPORT, IOPORT_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) pr_info("SMsC 37B787 watchdog component driver removed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) module_init(wb_smsc_wdt_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) module_exit(wb_smsc_wdt_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) MODULE_AUTHOR("Sven Anders <anders@anduras.de>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) MODULE_DESCRIPTION("Driver for SMsC 37B787 watchdog component (Version "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) VERSION ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) #ifdef SMSC_SUPPORT_MINUTES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) module_param(unit, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) MODULE_PARM_DESC(unit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) "set unit to use, 0=seconds or 1=minutes, default is 0");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) module_param(timeout, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) MODULE_PARM_DESC(timeout, "range is 1-255 units, default is 60");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) module_param(nowayout, bool, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) MODULE_PARM_DESC(nowayout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) "Watchdog cannot be stopped once started (default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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