^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * SBC8360 Watchdog driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * (c) Copyright 2005 Webcon, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Based on ib700wdt.c, which is based on advantechwdt.c which is based
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * on acquirewdt.c which is based on wdt.c.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * (c) Copyright 2001 Charles Howes <chowes@vsol.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Based on advantechwdt.c which is based on acquirewdt.c which
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * is based on wdt.c.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Based on acquirewdt.c which is based on wdt.c.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * Original copyright messages:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * warranty for any of this software. This material is provided
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * "AS-IS" and at no charge.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * Added timeout module option to override default
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <linux/ioport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) static unsigned long sbc8360_is_open;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static char expect_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * Watchdog Timer Configuration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * The function of the watchdog timer is to reset the system automatically
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * and is defined at I/O port 0120H and 0121H. To enable the watchdog timer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * and allow the system to reset, write appropriate values from the table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * below to I/O port 0120H and 0121H. To disable the timer, write a zero
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * value to I/O port 0121H for the system to stop the watchdog function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * The following describes how the timer should be programmed (according to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * the vendor documentation)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * Enabling Watchdog:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * MOV AX,000AH (enable, phase I)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * MOV DX,0120H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * OUT DX,AX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * MOV AX,000BH (enable, phase II)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * MOV DX,0120H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * OUT DX,AX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * MOV AX,000nH (set multiplier n, from 1-4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * MOV DX,0120H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * OUT DX,AX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * MOV AX,000mH (set base timer m, from 0-F)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * MOV DX,0121H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * OUT DX,AX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * Reset timer:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * MOV AX,000mH (same as set base timer, above)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * MOV DX,0121H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * OUT DX,AX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * Disabling Watchdog:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * MOV AX,0000H (a zero value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * MOV DX,0120H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * OUT DX,AX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * Watchdog timeout configuration values:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * N
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * M | 1 2 3 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * --|----------------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * 0 | 0.5s 5s 50s 100s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * 1 | 1s 10s 100s 200s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * 2 | 1.5s 15s 150s 300s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * 3 | 2s 20s 200s 400s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * 4 | 2.5s 25s 250s 500s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * 5 | 3s 30s 300s 600s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * 6 | 3.5s 35s 350s 700s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * 7 | 4s 40s 400s 800s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * 8 | 4.5s 45s 450s 900s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * 9 | 5s 50s 500s 1000s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * A | 5.5s 55s 550s 1100s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * B | 6s 60s 600s 1200s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * C | 6.5s 65s 650s 1300s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) * D | 7s 70s 700s 1400s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) * E | 7.5s 75s 750s 1500s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) * F | 8s 80s 800s 1600s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) * Another way to say the same things is:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) * For N=1, Timeout = (M+1) * 0.5s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) * For N=2, Timeout = (M+1) * 5s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * For N=3, Timeout = (M+1) * 50s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * For N=4, Timeout = (M+1) * 100s
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) static int wd_times[64][2] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {0, 1}, /* 0 = 0.5s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {1, 1}, /* 1 = 1s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {2, 1}, /* 2 = 1.5s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {3, 1}, /* 3 = 2s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {4, 1}, /* 4 = 2.5s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {5, 1}, /* 5 = 3s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {6, 1}, /* 6 = 3.5s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {7, 1}, /* 7 = 4s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) {8, 1}, /* 8 = 4.5s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {9, 1}, /* 9 = 5s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {0xA, 1}, /* 10 = 5.5s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {0xB, 1}, /* 11 = 6s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {0xC, 1}, /* 12 = 6.5s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) {0xD, 1}, /* 13 = 7s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {0xE, 1}, /* 14 = 7.5s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {0xF, 1}, /* 15 = 8s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {0, 2}, /* 16 = 5s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {1, 2}, /* 17 = 10s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {2, 2}, /* 18 = 15s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {3, 2}, /* 19 = 20s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {4, 2}, /* 20 = 25s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) {5, 2}, /* 21 = 30s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) {6, 2}, /* 22 = 35s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {7, 2}, /* 23 = 40s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {8, 2}, /* 24 = 45s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {9, 2}, /* 25 = 50s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {0xA, 2}, /* 26 = 55s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) {0xB, 2}, /* 27 = 60s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {0xC, 2}, /* 28 = 65s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) {0xD, 2}, /* 29 = 70s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {0xE, 2}, /* 30 = 75s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {0xF, 2}, /* 31 = 80s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) {0, 3}, /* 32 = 50s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) {1, 3}, /* 33 = 100s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) {2, 3}, /* 34 = 150s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {3, 3}, /* 35 = 200s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {4, 3}, /* 36 = 250s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) {5, 3}, /* 37 = 300s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) {6, 3}, /* 38 = 350s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {7, 3}, /* 39 = 400s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {8, 3}, /* 40 = 450s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {9, 3}, /* 41 = 500s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {0xA, 3}, /* 42 = 550s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {0xB, 3}, /* 43 = 600s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {0xC, 3}, /* 44 = 650s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {0xD, 3}, /* 45 = 700s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) {0xE, 3}, /* 46 = 750s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {0xF, 3}, /* 47 = 800s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) {0, 4}, /* 48 = 100s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {1, 4}, /* 49 = 200s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {2, 4}, /* 50 = 300s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {3, 4}, /* 51 = 400s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {4, 4}, /* 52 = 500s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {5, 4}, /* 53 = 600s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) {6, 4}, /* 54 = 700s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) {7, 4}, /* 55 = 800s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) {8, 4}, /* 56 = 900s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {9, 4}, /* 57 = 1000s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) {0xA, 4}, /* 58 = 1100s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {0xB, 4}, /* 59 = 1200s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {0xC, 4}, /* 60 = 1300s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {0xD, 4}, /* 61 = 1400s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) {0xE, 4}, /* 62 = 1500s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) {0xF, 4} /* 63 = 1600s */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) #define SBC8360_ENABLE 0x120
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) #define SBC8360_BASETIME 0x121
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static int timeout = 27;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) static int wd_margin = 0xB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) static int wd_multiplier = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) static bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) module_param(timeout, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) MODULE_PARM_DESC(timeout, "Index into timeout table (0-63) (default=27 (60s))");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) module_param(nowayout, bool, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) MODULE_PARM_DESC(nowayout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) "Watchdog cannot be stopped once started (default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) * Kernel methods.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) /* Activate and pre-configure watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) static void sbc8360_activate(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) /* Enable the watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) outb(0x0A, SBC8360_ENABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) msleep_interruptible(100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) outb(0x0B, SBC8360_ENABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) msleep_interruptible(100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) /* Set timeout multiplier */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) outb(wd_multiplier, SBC8360_ENABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) msleep_interruptible(100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) /* Nothing happens until first sbc8360_ping() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) /* Kernel pings watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) static void sbc8360_ping(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) /* Write the base timer register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) outb(wd_margin, SBC8360_BASETIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) /* stop watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) static void sbc8360_stop(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) /* De-activate the watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) outb(0, SBC8360_ENABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) /* Userspace pings kernel driver, or requests clean close */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) static ssize_t sbc8360_write(struct file *file, const char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) if (count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) if (!nowayout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) size_t i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /* In case it was set long ago */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) expect_close = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) for (i = 0; i != count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) char c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (get_user(c, buf + i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) if (c == 'V')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) expect_close = 42;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) sbc8360_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) static int sbc8360_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) if (test_and_set_bit(0, &sbc8360_is_open))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) if (nowayout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) __module_get(THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /* Activate and ping once to start the countdown */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) sbc8360_activate();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) sbc8360_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) return stream_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) static int sbc8360_close(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (expect_close == 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) sbc8360_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) pr_crit("SBC8360 device closed unexpectedly. SBC8360 will not stop!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) clear_bit(0, &sbc8360_is_open);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) expect_close = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * Notifier for system down
^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) static int sbc8360_notify_sys(struct notifier_block *this, unsigned long code,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) void *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) if (code == SYS_DOWN || code == SYS_HALT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) sbc8360_stop(); /* Disable the SBC8360 Watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) * Kernel Interfaces
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) static const struct file_operations sbc8360_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) .llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) .write = sbc8360_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) .open = sbc8360_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) .release = sbc8360_close,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) static struct miscdevice sbc8360_miscdev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) .minor = WATCHDOG_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) .name = "watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) .fops = &sbc8360_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) * The SBC8360 needs to learn about soft shutdowns in order to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) * turn the timebomb registers off.
^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) static struct notifier_block sbc8360_notifier = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) .notifier_call = sbc8360_notify_sys,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) static int __init sbc8360_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) unsigned long int mseconds = 60000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) if (timeout < 0 || timeout > 63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) pr_err("Invalid timeout index (must be 0-63)\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) res = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) if (!request_region(SBC8360_ENABLE, 1, "SBC8360")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) pr_err("ENABLE method I/O %X is not available\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) SBC8360_ENABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) res = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) if (!request_region(SBC8360_BASETIME, 1, "SBC8360")) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) pr_err("BASETIME method I/O %X is not available\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) SBC8360_BASETIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) res = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) goto out_nobasetimereg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) res = register_reboot_notifier(&sbc8360_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) if (res) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) pr_err("Failed to register reboot notifier\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) goto out_noreboot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) res = misc_register(&sbc8360_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) if (res) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) pr_err("failed to register misc device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) goto out_nomisc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) wd_margin = wd_times[timeout][0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) wd_multiplier = wd_times[timeout][1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) if (wd_multiplier == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) mseconds = (wd_margin + 1) * 500;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) else if (wd_multiplier == 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) mseconds = (wd_margin + 1) * 5000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) else if (wd_multiplier == 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) mseconds = (wd_margin + 1) * 50000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) else if (wd_multiplier == 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) mseconds = (wd_margin + 1) * 100000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) /* My kingdom for the ability to print "0.5 seconds" in the kernel! */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) pr_info("Timeout set at %ld ms\n", mseconds);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) out_nomisc:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) unregister_reboot_notifier(&sbc8360_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) out_noreboot:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) release_region(SBC8360_BASETIME, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) out_nobasetimereg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) release_region(SBC8360_ENABLE, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) static void __exit sbc8360_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) misc_deregister(&sbc8360_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) unregister_reboot_notifier(&sbc8360_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) release_region(SBC8360_ENABLE, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) release_region(SBC8360_BASETIME, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) module_init(sbc8360_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) module_exit(sbc8360_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) MODULE_AUTHOR("Ian E. Morgan <imorgan@webcon.ca>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) MODULE_DESCRIPTION("SBC8360 watchdog driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) MODULE_VERSION("1.01");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) /* end of sbc8360.c */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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