Orange Pi5 kernel

^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)  *  PNX833x Hardware Watchdog Driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *  Copyright 2008 NXP Semiconductors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *  Daniel Laird <daniel.j.laird@nxp.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *  Andre McCurdy <andre.mccurdy@nxp.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *  Heavily based upon - IndyDog	0.3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *  A Hardware Watchdog Device for SGI IP22
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * (c) Copyright 2002 Guido Guenther <agx@sigxcpu.org>, All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * based on softdog.c by Alan Cox <alan@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/moduleparam.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/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/watchdog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/notifier.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 <asm/mach-pnx833x/pnx833x.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #define WATCHDOG_TIMEOUT 30		/* 30 sec Maximum timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #define WATCHDOG_COUNT_FREQUENCY 68000000U /* Watchdog counts at 68MHZ. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #define	PNX_WATCHDOG_TIMEOUT	(WATCHDOG_TIMEOUT * WATCHDOG_COUNT_FREQUENCY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #define PNX_TIMEOUT_VALUE	2040000000U
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) /** CONFIG block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #define PNX833X_CONFIG                      (0x07000U)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #define PNX833X_CONFIG_CPU_WATCHDOG         (0x54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #define PNX833X_CONFIG_CPU_WATCHDOG_COMPARE (0x58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #define PNX833X_CONFIG_CPU_COUNTERS_CONTROL (0x1c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) /** RESET block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) #define PNX833X_RESET                       (0x08000U)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #define PNX833X_RESET_CONFIG                (0x08)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) static int pnx833x_wdt_alive;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) /* Set default timeout in MHZ.*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) static int pnx833x_wdt_timeout = PNX_WATCHDOG_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) module_param(pnx833x_wdt_timeout, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) MODULE_PARM_DESC(timeout, "Watchdog timeout in Mhz. (68Mhz clock), default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 			__MODULE_STRING(PNX_TIMEOUT_VALUE) "(30 seconds).");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) static bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) module_param(nowayout, bool, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 					__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) #define START_DEFAULT	1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) static int start_enabled = START_DEFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) module_param(start_enabled, int, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) MODULE_PARM_DESC(start_enabled, "Watchdog is started on module insertion "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 				"(default=" __MODULE_STRING(START_DEFAULT) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) static void pnx833x_wdt_start(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	/* Enable watchdog causing reset. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	PNX833X_REG(PNX833X_RESET + PNX833X_RESET_CONFIG) |= 0x1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	/* Set timeout.*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	PNX833X_REG(PNX833X_CONFIG +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		PNX833X_CONFIG_CPU_WATCHDOG_COMPARE) = pnx833x_wdt_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	/* Enable watchdog. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	PNX833X_REG(PNX833X_CONFIG +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 				PNX833X_CONFIG_CPU_COUNTERS_CONTROL) |= 0x1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	pr_info("Started watchdog timer\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) static void pnx833x_wdt_stop(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	/* Disable watchdog causing reset. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	PNX833X_REG(PNX833X_RESET + PNX833X_CONFIG) &= 0xFFFFFFFE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	/* Disable watchdog.*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	PNX833X_REG(PNX833X_CONFIG +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 			PNX833X_CONFIG_CPU_COUNTERS_CONTROL) &= 0xFFFFFFFE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	pr_info("Stopped watchdog timer\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) static void pnx833x_wdt_ping(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	PNX833X_REG(PNX833X_CONFIG +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		PNX833X_CONFIG_CPU_WATCHDOG_COMPARE) = pnx833x_wdt_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) }
^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)  *	Allow only one person to hold it open
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) static int pnx833x_wdt_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	if (test_and_set_bit(0, &pnx833x_wdt_alive))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	if (nowayout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		__module_get(THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	/* Activate timer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	if (!start_enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		pnx833x_wdt_start();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	pnx833x_wdt_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	pr_info("Started watchdog timer\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	return stream_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static int pnx833x_wdt_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	/* Shut off the timer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	 * Lock it in if it's a module and we defined ...NOWAYOUT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (!nowayout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		pnx833x_wdt_stop(); /* Turn the WDT off */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	clear_bit(0, &pnx833x_wdt_alive);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	return 0;
^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 ssize_t pnx833x_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	/* Refresh the timer. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	if (len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		pnx833x_wdt_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static long pnx833x_wdt_ioctl(struct file *file, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 							unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	int options, new_timeout = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	uint32_t timeout, timeout_left = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	static const struct watchdog_info ident = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		.firmware_version = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		.identity = "Hardware Watchdog for PNX833x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	case WDIOC_GETSUPPORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		if (copy_to_user((struct watchdog_info *)arg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 				 &ident, sizeof(ident)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	case WDIOC_GETSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	case WDIOC_GETBOOTSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		return put_user(0, (int *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	case WDIOC_SETOPTIONS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		if (get_user(options, (int *)arg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		if (options & WDIOS_DISABLECARD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 			pnx833x_wdt_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		if (options & WDIOS_ENABLECARD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 			pnx833x_wdt_start();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	case WDIOC_KEEPALIVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		pnx833x_wdt_ping();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	case WDIOC_SETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		if (get_user(new_timeout, (int *)arg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		pnx833x_wdt_timeout = new_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		PNX833X_REG(PNX833X_CONFIG +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			PNX833X_CONFIG_CPU_WATCHDOG_COMPARE) = new_timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		return put_user(new_timeout, (int *)arg);
^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) 	case WDIOC_GETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		timeout = PNX833X_REG(PNX833X_CONFIG +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 					PNX833X_CONFIG_CPU_WATCHDOG_COMPARE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		return put_user(timeout, (int *)arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	case WDIOC_GETTIMELEFT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		timeout_left = PNX833X_REG(PNX833X_CONFIG +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 						PNX833X_CONFIG_CPU_WATCHDOG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		return put_user(timeout_left, (int *)arg);
^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) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) static int pnx833x_wdt_notify_sys(struct notifier_block *this,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 					unsigned long code, void *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	if (code == SYS_DOWN || code == SYS_HALT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		pnx833x_wdt_stop(); /* Turn the WDT off */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	return NOTIFY_DONE;
^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) static const struct file_operations pnx833x_wdt_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	.owner		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	.llseek		= no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	.write		= pnx833x_wdt_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	.unlocked_ioctl	= pnx833x_wdt_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	.compat_ioctl	= compat_ptr_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	.open		= pnx833x_wdt_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	.release	= pnx833x_wdt_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) static struct miscdevice pnx833x_wdt_miscdev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	.minor		= WATCHDOG_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	.name		= "watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	.fops		= &pnx833x_wdt_fops,
^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) static struct notifier_block pnx833x_wdt_notifier = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	.notifier_call = pnx833x_wdt_notify_sys,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) static int __init watchdog_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	int ret, cause;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	/* Lets check the reason for the reset.*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	cause = PNX833X_REG(PNX833X_RESET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	/*If bit 31 is set then watchdog was cause of reset.*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	if (cause & 0x80000000) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		pr_info("The system was previously reset due to the watchdog firing - please investigate...\n");
^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) 	ret = register_reboot_notifier(&pnx833x_wdt_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		pr_err("cannot register reboot notifier (err=%d)\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	ret = misc_register(&pnx833x_wdt_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		pr_err("cannot register miscdev on minor=%d (err=%d)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		       WATCHDOG_MINOR, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		unregister_reboot_notifier(&pnx833x_wdt_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	pr_info("Hardware Watchdog Timer for PNX833x: Version 0.1\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	if (start_enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		pnx833x_wdt_start();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) static void __exit watchdog_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	misc_deregister(&pnx833x_wdt_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	unregister_reboot_notifier(&pnx833x_wdt_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) module_init(watchdog_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) module_exit(watchdog_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) MODULE_AUTHOR("Daniel Laird/Andre McCurdy");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) MODULE_DESCRIPTION("Hardware Watchdog Device for PNX833x");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) MODULE_LICENSE("GPL");