^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) * Intel 21285 watchdog driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (c) Phil Blundell <pb@nexus.co.uk>, 1998
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * based on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * SoftDog 0.05: A Software Watchdog Device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <mach/hardware.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <asm/mach-types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <asm/system_info.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <asm/hardware/dec21285.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * Define this to stop the watchdog actually rebooting the machine.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #undef ONLY_TESTING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static unsigned int soft_margin = 60; /* in seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static unsigned int reload;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static unsigned long timer_alive;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #ifdef ONLY_TESTING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * If the timer expires..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static void watchdog_fire(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) pr_crit("Would Reboot\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) *CSR_TIMER4_CNTL = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) *CSR_TIMER4_CLR = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #endif
^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) * Refresh the timer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) static void watchdog_ping(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) *CSR_TIMER4_LOAD = reload;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * Allow only one person to hold it open
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) static int watchdog_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (*CSR_SA110_CNTL & (1 << 13))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (test_and_set_bit(1, &timer_alive))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) reload = soft_margin * (mem_fclk_21285 / 256);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) *CSR_TIMER4_CLR = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) watchdog_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) *CSR_TIMER4_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_AUTORELOAD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) | TIMER_CNTL_DIV256;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) #ifdef ONLY_TESTING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) ret = request_irq(IRQ_TIMER4, watchdog_fire, 0, "watchdog", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) *CSR_TIMER4_CNTL = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) clear_bit(1, &timer_alive);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * Setting this bit is irreversible; once enabled, there is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * no way to disable the watchdog.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) *CSR_SA110_CNTL |= 1 << 13;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) stream_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return ret;
^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * Shut off the timer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * Note: if we really have enabled the watchdog, there
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) * is no way to turn off.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static int watchdog_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) #ifdef ONLY_TESTING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) free_irq(IRQ_TIMER4, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) clear_bit(1, &timer_alive);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return 0;
^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) static ssize_t watchdog_write(struct file *file, const char __user *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) size_t len, loff_t *ppos)
^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) * Refresh the timer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) watchdog_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) static const struct watchdog_info ident = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) .options = WDIOF_SETTIMEOUT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) .identity = "Footbridge Watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static long watchdog_ioctl(struct file *file, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) int __user *int_arg = (int __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) int new_margin, ret = -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) case WDIOC_GETSUPPORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) case WDIOC_GETSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) case WDIOC_GETBOOTSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) ret = put_user(0, int_arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) case WDIOC_KEEPALIVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) watchdog_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) case WDIOC_SETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) ret = get_user(new_margin, int_arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) /* Arbitrary, can't find the card's limits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if (new_margin < 0 || new_margin > 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) soft_margin = new_margin;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) reload = soft_margin * (mem_fclk_21285 / 256);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) watchdog_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) case WDIOC_GETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) ret = put_user(soft_margin, int_arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) static const struct file_operations watchdog_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) .llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) .write = watchdog_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) .unlocked_ioctl = watchdog_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) .compat_ioctl = compat_ptr_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) .open = watchdog_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) .release = watchdog_release,
^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) static struct miscdevice watchdog_miscdev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) .minor = WATCHDOG_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) .name = "watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) .fops = &watchdog_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) static int __init footbridge_watchdog_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) if (machine_is_netwinder())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) retval = misc_register(&watchdog_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (retval < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) pr_info("Footbridge Watchdog Timer: 0.01, timer margin: %d sec\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) soft_margin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) if (machine_is_cats())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) pr_warn("Warning: Watchdog reset may not work on this machine\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) static void __exit footbridge_watchdog_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) misc_deregister(&watchdog_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) MODULE_AUTHOR("Phil Blundell <pb@nexus.co.uk>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) MODULE_DESCRIPTION("Footbridge watchdog driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) module_param(soft_margin, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) module_init(footbridge_watchdog_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) module_exit(footbridge_watchdog_exit);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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