Orange Pi5 kernel

^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)  *  Broadcom BCM63xx SoC watchdog driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *  Copyright (C) 2007, Miguel Gaio <miguel.gaio@efixo.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *  Copyright (C) 2008, Florian Fainelli <florian@openwrt.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/miscdevice.h>
^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/uaccess.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/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/jiffies.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/resource.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include <bcm63xx_cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include <bcm63xx_io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #include <bcm63xx_regs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include <bcm63xx_timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #define PFX KBUILD_MODNAME
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #define WDT_HZ		50000000 /* Fclk */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #define WDT_DEFAULT_TIME	30      /* seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #define WDT_MAX_TIME		256     /* seconds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) static struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	void __iomem *regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	struct timer_list timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	unsigned long inuse;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	atomic_t ticks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) } bcm63xx_wdt_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) static int expect_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) static int wdt_time = WDT_DEFAULT_TIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) static bool nowayout = WATCHDOG_NOWAYOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) module_param(nowayout, bool, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) /* HW functions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) static void bcm63xx_wdt_hw_start(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	bcm_writel(0xfffffffe, bcm63xx_wdt_device.regs + WDT_DEFVAL_REG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	bcm_writel(WDT_START_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	bcm_writel(WDT_START_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
^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) static void bcm63xx_wdt_hw_stop(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	bcm_writel(WDT_STOP_1, bcm63xx_wdt_device.regs + WDT_CTL_REG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	bcm_writel(WDT_STOP_2, bcm63xx_wdt_device.regs + WDT_CTL_REG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) static void bcm63xx_wdt_isr(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	struct pt_regs *regs = get_irq_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	die(PFX " fire", regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) static void bcm63xx_timer_tick(struct timer_list *unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	if (!atomic_dec_and_test(&bcm63xx_wdt_device.ticks)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		bcm63xx_wdt_hw_start();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		mod_timer(&bcm63xx_wdt_device.timer, jiffies + HZ);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		pr_crit("watchdog will restart system\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) static void bcm63xx_wdt_pet(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	atomic_set(&bcm63xx_wdt_device.ticks, wdt_time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) static void bcm63xx_wdt_start(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	bcm63xx_wdt_pet();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	bcm63xx_timer_tick(0);
^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) static void bcm63xx_wdt_pause(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	del_timer_sync(&bcm63xx_wdt_device.timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	bcm63xx_wdt_hw_stop();
^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) static int bcm63xx_wdt_settimeout(int new_time)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	wdt_time = new_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static int bcm63xx_wdt_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	if (test_and_set_bit(0, &bcm63xx_wdt_device.inuse))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	bcm63xx_wdt_start();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	return stream_open(inode, file);
^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 bcm63xx_wdt_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (expect_close == 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		bcm63xx_wdt_pause();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		pr_crit("Unexpected close, not stopping watchdog!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		bcm63xx_wdt_start();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	clear_bit(0, &bcm63xx_wdt_device.inuse);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	expect_close = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) static ssize_t bcm63xx_wdt_write(struct file *file, const char *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 				size_t len, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		if (!nowayout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 			size_t i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 			/* In case it was set long ago */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 			expect_close = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 			for (i = 0; i != len; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 				char c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 				if (get_user(c, data + i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 					return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 				if (c == 'V')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 					expect_close = 42;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		bcm63xx_wdt_pet();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) static struct watchdog_info bcm63xx_wdt_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	.identity       = PFX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	.options        = WDIOF_SETTIMEOUT |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 				WDIOF_KEEPALIVEPING |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 				WDIOF_MAGICCLOSE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static long bcm63xx_wdt_ioctl(struct file *file, unsigned int cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 				unsigned long arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	void __user *argp = (void __user *)arg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	int __user *p = argp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	int new_value, retval = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	case WDIOC_GETSUPPORT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		return copy_to_user(argp, &bcm63xx_wdt_info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 			sizeof(bcm63xx_wdt_info)) ? -EFAULT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	case WDIOC_GETSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	case WDIOC_GETBOOTSTATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		return put_user(0, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	case WDIOC_SETOPTIONS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		if (get_user(new_value, p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		if (new_value & WDIOS_DISABLECARD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			bcm63xx_wdt_pause();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 			retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		if (new_value & WDIOS_ENABLECARD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 			bcm63xx_wdt_start();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			retval = 0;
^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) 		return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	case WDIOC_KEEPALIVE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		bcm63xx_wdt_pet();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	case WDIOC_SETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 		if (get_user(new_value, p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 			return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		if (bcm63xx_wdt_settimeout(new_value))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		bcm63xx_wdt_pet();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	case WDIOC_GETTIMEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		return put_user(wdt_time, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	}
^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) static const struct file_operations bcm63xx_wdt_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	.owner		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	.llseek		= no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	.write		= bcm63xx_wdt_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	.unlocked_ioctl	= bcm63xx_wdt_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	.compat_ioctl	= compat_ptr_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	.open		= bcm63xx_wdt_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	.release	= bcm63xx_wdt_release,
^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 miscdevice bcm63xx_wdt_miscdev = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	.minor	= WATCHDOG_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	.name	= "watchdog",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	.fops	= &bcm63xx_wdt_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) };
^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) static int bcm63xx_wdt_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	struct resource *r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	timer_setup(&bcm63xx_wdt_device.timer, bcm63xx_timer_tick, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	if (!r) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		dev_err(&pdev->dev, "failed to get resources\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	bcm63xx_wdt_device.regs = devm_ioremap(&pdev->dev, r->start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 							resource_size(r));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	if (!bcm63xx_wdt_device.regs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		dev_err(&pdev->dev, "failed to remap I/O resources\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	ret = bcm63xx_timer_register(TIMER_WDT_ID, bcm63xx_wdt_isr, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		dev_err(&pdev->dev, "failed to register wdt timer isr\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	if (bcm63xx_wdt_settimeout(wdt_time)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		bcm63xx_wdt_settimeout(WDT_DEFAULT_TIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		dev_info(&pdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 			": wdt_time value must be 1 <= wdt_time <= 256, using %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 			wdt_time);
^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) 	ret = misc_register(&bcm63xx_wdt_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		dev_err(&pdev->dev, "failed to register watchdog device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		goto unregister_timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	dev_info(&pdev->dev, " started, timer margin: %d sec\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 						WDT_DEFAULT_TIME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) unregister_timer:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	bcm63xx_timer_unregister(TIMER_WDT_ID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	return ret;
^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) static int bcm63xx_wdt_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	if (!nowayout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		bcm63xx_wdt_pause();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	misc_deregister(&bcm63xx_wdt_miscdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	bcm63xx_timer_unregister(TIMER_WDT_ID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) static void bcm63xx_wdt_shutdown(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	bcm63xx_wdt_pause();
^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 struct platform_driver bcm63xx_wdt_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	.probe	= bcm63xx_wdt_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	.remove = bcm63xx_wdt_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	.shutdown = bcm63xx_wdt_shutdown,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		.name = "bcm63xx-wdt",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) module_platform_driver(bcm63xx_wdt_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) MODULE_AUTHOR("Miguel Gaio <miguel.gaio@efixo.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) MODULE_DESCRIPTION("Driver for the Broadcom BCM63xx SoC watchdog");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) MODULE_ALIAS("platform:bcm63xx-wdt");