^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) * NS pc87413-wdt 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) * This code is based on wdt.c with original copyright.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * (C) Copyright 2006 Sven Anders, <anders@anduras.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * and Marcus Junker, <junker@anduras.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Neither Sven Anders, Marcus Junker nor ANDURAS AG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * admit liability nor provide warranty for any of this software.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * This material is provided "AS-IS" and at no charge.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Release 1.1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/ioport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/uaccess.h>
^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 DEBUG 1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define DEFAULT_TIMEOUT 1 /* 1 minute */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define MAX_TIMEOUT 255
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define VERSION "1.1"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define MODNAME "pc87413 WDT"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define DPFX MODNAME " - DEBUG: "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #define WDT_INDEX_IO_PORT (io+0) /* I/O port base (index register) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #define WDT_DATA_IO_PORT (WDT_INDEX_IO_PORT+1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #define SWC_LDN 0x04
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #define SIOCFG2 0x22 /* Serial IO register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #define WDCTL 0x10 /* Watchdog-Timer-Control-Register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #define WDTO 0x11 /* Watchdog timeout register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #define WDCFG 0x12 /* Watchdog config register */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #define IO_DEFAULT 0x2E /* Address used on Portwell Boards */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static int io = IO_DEFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static int swc_base_addr = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static int timeout = DEFAULT_TIMEOUT; /* timeout value */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static unsigned long timer_enabled; /* is the timer enabled? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) static char expect_close; /* is the close expected? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static DEFINE_SPINLOCK(io_lock); /* to guard us from io races */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) /* -- Low level function ----------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /* Select pins for Watchdog output */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) static inline void pc87413_select_wdt_out(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) unsigned int cr_data = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /* Step 1: Select multiple pin,pin55,as WDT output */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) outb_p(SIOCFG2, WDT_INDEX_IO_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) cr_data = inb(WDT_DATA_IO_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) cr_data |= 0x80; /* Set Bit7 to 1*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) outb_p(SIOCFG2, WDT_INDEX_IO_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) outb_p(cr_data, WDT_DATA_IO_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) pr_info(DPFX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) "Select multiple pin,pin55,as WDT output: Bit7 to 1: %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) cr_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /* Enable SWC functions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) static inline void pc87413_enable_swc(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) unsigned int cr_data = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) /* Step 2: Enable SWC functions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) outb_p(0x07, WDT_INDEX_IO_PORT); /* Point SWC_LDN (LDN=4) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) outb_p(SWC_LDN, WDT_DATA_IO_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) outb_p(0x30, WDT_INDEX_IO_PORT); /* Read Index 0x30 First */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) cr_data = inb(WDT_DATA_IO_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) cr_data |= 0x01; /* Set Bit0 to 1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) outb_p(0x30, WDT_INDEX_IO_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) outb_p(cr_data, WDT_DATA_IO_PORT); /* Index0x30_bit0P1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) pr_info(DPFX "pc87413 - Enable SWC functions\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) /* Read SWC I/O base address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static void pc87413_get_swc_base_addr(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) unsigned char addr_l, addr_h = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /* Step 3: Read SWC I/O Base Address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) outb_p(0x60, WDT_INDEX_IO_PORT); /* Read Index 0x60 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) addr_h = inb(WDT_DATA_IO_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) outb_p(0x61, WDT_INDEX_IO_PORT); /* Read Index 0x61 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) addr_l = inb(WDT_DATA_IO_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) swc_base_addr = (addr_h << 8) + addr_l;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) pr_info(DPFX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) "Read SWC I/O Base Address: low %d, high %d, res %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) addr_l, addr_h, swc_base_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) /* Select Bank 3 of SWC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static inline void pc87413_swc_bank3(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /* Step 4: Select Bank3 of SWC */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) outb_p(inb(swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) pr_info(DPFX "Select Bank3 of SWC\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) /* Set watchdog timeout to x minutes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static inline void pc87413_programm_wdto(char pc87413_time)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) /* Step 5: Programm WDTO, Twd. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) outb_p(pc87413_time, swc_base_addr + WDTO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) pr_info(DPFX "Set WDTO to %d minutes\n", pc87413_time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /* Enable WDEN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) static inline void pc87413_enable_wden(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) /* Step 6: Enable WDEN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) outb_p(inb(swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) pr_info(DPFX "Enable WDEN\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) /* Enable SW_WD_TREN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) static inline void pc87413_enable_sw_wd_tren(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) /* Enable SW_WD_TREN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) outb_p(inb(swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) pr_info(DPFX "Enable SW_WD_TREN\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) /* Disable SW_WD_TREN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) static inline void pc87413_disable_sw_wd_tren(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) /* Disable SW_WD_TREN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) outb_p(inb(swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) pr_info(DPFX "pc87413 - Disable SW_WD_TREN\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) /* Enable SW_WD_TRG */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) static inline void pc87413_enable_sw_wd_trg(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) /* Enable SW_WD_TRG */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) outb_p(inb(swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) pr_info(DPFX "pc87413 - Enable SW_WD_TRG\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) /* Disable SW_WD_TRG */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) static inline void pc87413_disable_sw_wd_trg(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) /* Disable SW_WD_TRG */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) outb_p(inb(swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) pr_info(DPFX "Disable SW_WD_TRG\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) /* -- Higher level functions ------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) /* Enable the watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) static void pc87413_enable(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) spin_lock(&io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) pc87413_swc_bank3();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) pc87413_programm_wdto(timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) pc87413_enable_wden();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) pc87413_enable_sw_wd_tren();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) pc87413_enable_sw_wd_trg();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) spin_unlock(&io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) /* Disable the watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static void pc87413_disable(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) spin_lock(&io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) pc87413_swc_bank3();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) pc87413_disable_sw_wd_tren();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) pc87413_disable_sw_wd_trg();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) pc87413_programm_wdto(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) spin_unlock(&io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /* Refresh the watchdog */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) static void pc87413_refresh(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) spin_lock(&io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) pc87413_swc_bank3();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) pc87413_disable_sw_wd_tren();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) pc87413_disable_sw_wd_trg();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) pc87413_programm_wdto(timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) pc87413_enable_wden();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) pc87413_enable_sw_wd_tren();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) pc87413_enable_sw_wd_trg();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) spin_unlock(&io_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) /* -- File operations -------------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) * pc87413_open:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) * @inode: inode of device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) * @file: file handle to device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) static int pc87413_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) /* /dev/watchdog can only be opened once */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) if (test_and_set_bit(0, &timer_enabled))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) if (nowayout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) __module_get(THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) /* Reload and activate timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) pc87413_refresh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) pr_info("Watchdog enabled. Timeout set to %d minute(s).\n", timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) return stream_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^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) * pc87413_release:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) * @inode: inode to board
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) * @file: file handle to board
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) * The watchdog has a configurable API. There is a religious dispute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) * between people who want their watchdog to be able to shut down and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) * those who want to be sure if the watchdog manager dies the machine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * reboots. In the former case we disable the counters, in the latter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) * case you have to open it again very soon.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) static int pc87413_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) /* Shut off the timer. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) if (expect_close == 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) pc87413_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) pr_info("Watchdog disabled, sleeping again...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) pr_crit("Unexpected close, not stopping watchdog!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) pc87413_refresh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) clear_bit(0, &timer_enabled);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) expect_close = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) return 0;
^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) * pc87413_status:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) * return, if the watchdog is enabled (timeout is set...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) static int pc87413_status(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) return 0; /* currently not supported */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) * pc87413_write:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) * @file: file handle to the watchdog
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) * @data: data buffer to write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) * @len: length in bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) * @ppos: pointer to the position to write. No seeks allowed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) * A write to a watchdog device is defined as a keepalive signal. Any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) * write of data will do, as we we don't define content meaning.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) static ssize_t pc87413_write(struct file *file, const char __user *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) size_t len, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) /* See if we got the magic character 'V' and reload the timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) if (!nowayout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) size_t i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) /* reset expect flag */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) expect_close = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) /* scan to see whether or not we got the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) magic character */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) for (i = 0; i != len; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) char c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) if (get_user(c, data + i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) if (c == 'V')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) expect_close = 42;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^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) /* someone wrote to us, we should reload the timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) pc87413_refresh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^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) * pc87413_ioctl:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) * @file: file handle to the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) * @cmd: watchdog command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) * @arg: argument pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) * The watchdog API defines a common set of functions for all watchdogs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * according to their available features. We only actually usefully support
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * querying capabilities and current status.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) static long pc87413_ioctl(struct file *file, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) int new_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) struct watchdog_info __user *ident;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) int __user *i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) } uarg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) static const struct watchdog_info ident = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) .options = WDIOF_KEEPALIVEPING |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) WDIOF_SETTIMEOUT |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) WDIOF_MAGICCLOSE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) .firmware_version = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) .identity = "PC87413(HF/F) watchdog",
^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) uarg.i = (int __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) case WDIOC_GETSUPPORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) return copy_to_user(uarg.ident, &ident,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) sizeof(ident)) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) case WDIOC_GETSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) return put_user(pc87413_status(), uarg.i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) case WDIOC_GETBOOTSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) return put_user(0, uarg.i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) case WDIOC_SETOPTIONS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) int options, retval = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) if (get_user(options, uarg.i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) if (options & WDIOS_DISABLECARD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) pc87413_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) if (options & WDIOS_ENABLECARD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) pc87413_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) case WDIOC_KEEPALIVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) pc87413_refresh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) #ifdef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) pr_info(DPFX "keepalive\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) case WDIOC_SETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) if (get_user(new_timeout, uarg.i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) /* the API states this is given in secs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) new_timeout /= 60;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) if (new_timeout < 0 || new_timeout > MAX_TIMEOUT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) timeout = new_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) pc87413_refresh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) fallthrough; /* and return the new timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) case WDIOC_GETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) new_timeout = timeout * 60;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) return put_user(new_timeout, uarg.i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) /* -- Notifier funtions -----------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) * notify_sys:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) * @this: our notifier block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) * @code: the event being reported
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) * @unused: unused
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) * Our notifier is called on system shutdowns. We want to turn the card
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) * off at reboot otherwise the machine will reboot again during memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) * test or worse yet during the following fsck. This would suck, in fact
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) * trust me - if it happens it does suck.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) static int pc87413_notify_sys(struct notifier_block *this,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) unsigned long code,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) void *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) if (code == SYS_DOWN || code == SYS_HALT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) /* Turn the card off */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) pc87413_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) return NOTIFY_DONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) /* -- Module's structures ---------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) static const struct file_operations pc87413_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) .llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) .write = pc87413_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) .unlocked_ioctl = pc87413_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) .compat_ioctl = compat_ptr_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) .open = pc87413_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) .release = pc87413_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) static struct notifier_block pc87413_notifier = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) .notifier_call = pc87413_notify_sys,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) static struct miscdevice pc87413_miscdev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) .minor = WATCHDOG_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) .name = "watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) .fops = &pc87413_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) /* -- Module init functions -------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) * pc87413_init: module's "constructor"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) * Set up the WDT watchdog board. All we have to do is grab the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) * resources we require and bitch if anyone beat us to them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) * The open() function will actually kick the board off.
^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) static int __init pc87413_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) pr_info("Version " VERSION " at io 0x%X\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) WDT_INDEX_IO_PORT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) if (!request_muxed_region(io, 2, MODNAME))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) ret = register_reboot_notifier(&pc87413_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) if (ret != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) pr_err("cannot register reboot notifier (err=%d)\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) ret = misc_register(&pc87413_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) if (ret != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) pr_err("cannot register miscdev on minor=%d (err=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) WATCHDOG_MINOR, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) goto reboot_unreg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) pr_info("initialized. timeout=%d min\n", timeout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) pc87413_select_wdt_out();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) pc87413_enable_swc();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) pc87413_get_swc_base_addr();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) if (!request_region(swc_base_addr, 0x20, MODNAME)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) pr_err("cannot request SWC region at 0x%x\n", swc_base_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) goto misc_unreg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) pc87413_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) release_region(io, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) misc_unreg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) misc_deregister(&pc87413_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) reboot_unreg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) unregister_reboot_notifier(&pc87413_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) release_region(io, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) * pc87413_exit: module's "destructor"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) * Unload the watchdog. You cannot do this with any file handles open.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) * If your watchdog is set to continue ticking on close and you unload
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) * it, well it keeps ticking. We won't get the interrupt but the board
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) * will not touch PC memory so all is fine. You just have to load a new
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) * module in 60 seconds or reboot.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) static void __exit pc87413_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) /* Stop the timer before we leave */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) if (!nowayout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) pc87413_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) pr_info("Watchdog disabled\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) misc_deregister(&pc87413_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) unregister_reboot_notifier(&pc87413_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) release_region(swc_base_addr, 0x20);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) pr_info("watchdog component driver removed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) module_init(pc87413_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) module_exit(pc87413_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) MODULE_AUTHOR("Sven Anders <anders@anduras.de>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) MODULE_AUTHOR("Marcus Junker <junker@anduras.de>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) MODULE_DESCRIPTION("PC87413 WDT driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) module_param_hw(io, int, ioport, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) MODULE_PARM_DESC(io, MODNAME " I/O port (default: "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) __MODULE_STRING(IO_DEFAULT) ").");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) module_param(timeout, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) MODULE_PARM_DESC(timeout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) "Watchdog timeout in minutes (default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) __MODULE_STRING(DEFAULT_TIMEOUT) ").");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) module_param(nowayout, bool, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) MODULE_PARM_DESC(nowayout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) "Watchdog cannot be stopped once started (default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592)
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags