2019-06-04 02:11:33 -06:00
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// SPDX-License-Identifier: GPL-2.0-only
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2011-01-04 13:28:19 -07:00
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/*
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* Atheros AR71XX/AR724X/AR913X built-in hardware watchdog timer.
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*
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* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
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*
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* This driver was based on: drivers/watchdog/ixp4xx_wdt.c
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* Author: Deepak Saxena <dsaxena@plexity.net>
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* Copyright 2004 (c) MontaVista, Software, Inc.
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*
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* which again was based on sa1100 driver,
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* Copyright (C) 2000 Oleg Drokin <green@crimea.edu>
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*/
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2012-02-15 16:06:19 -07:00
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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2011-01-04 13:28:19 -07:00
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#include <linux/bitops.h>
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2014-04-16 03:34:41 -06:00
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#include <linux/delay.h>
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2011-01-04 13:28:19 -07:00
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#include <linux/errno.h>
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#include <linux/fs.h>
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2012-12-27 07:38:26 -07:00
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#include <linux/io.h>
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2011-01-04 13:28:19 -07:00
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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#include <linux/watchdog.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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2013-02-02 02:34:54 -07:00
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#include <linux/of.h>
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#include <linux/of_platform.h>
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2016-09-05 09:35:50 -06:00
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#include <linux/uaccess.h>
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2011-01-04 13:28:19 -07:00
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#define DRIVER_NAME "ath79-wdt"
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#define WDT_TIMEOUT 15 /* seconds */
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2012-12-27 07:38:26 -07:00
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#define WDOG_REG_CTRL 0x00
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#define WDOG_REG_TIMER 0x04
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2011-01-04 13:28:19 -07:00
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#define WDOG_CTRL_LAST_RESET BIT(31)
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#define WDOG_CTRL_ACTION_MASK 3
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#define WDOG_CTRL_ACTION_NONE 0 /* no action */
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#define WDOG_CTRL_ACTION_GPI 1 /* general purpose interrupt */
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#define WDOG_CTRL_ACTION_NMI 2 /* NMI */
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#define WDOG_CTRL_ACTION_FCR 3 /* full chip reset */
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2012-03-05 08:51:11 -07:00
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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2011-01-04 13:28:19 -07:00
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
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"(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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static int timeout = WDT_TIMEOUT;
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module_param(timeout, int, 0);
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MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds "
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"(default=" __MODULE_STRING(WDT_TIMEOUT) "s)");
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static unsigned long wdt_flags;
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#define WDT_FLAGS_BUSY 0
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#define WDT_FLAGS_EXPECT_CLOSE 1
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static struct clk *wdt_clk;
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static unsigned long wdt_freq;
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static int boot_status;
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static int max_timeout;
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2012-12-27 07:38:26 -07:00
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static void __iomem *wdt_base;
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static inline void ath79_wdt_wr(unsigned reg, u32 val)
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{
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iowrite32(val, wdt_base + reg);
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}
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static inline u32 ath79_wdt_rr(unsigned reg)
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{
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return ioread32(wdt_base + reg);
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}
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2011-01-04 13:28:19 -07:00
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static inline void ath79_wdt_keepalive(void)
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{
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2012-12-27 07:38:26 -07:00
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ath79_wdt_wr(WDOG_REG_TIMER, wdt_freq * timeout);
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2011-12-23 11:25:42 -07:00
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/* flush write */
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2012-12-27 07:38:26 -07:00
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ath79_wdt_rr(WDOG_REG_TIMER);
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2011-01-04 13:28:19 -07:00
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}
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static inline void ath79_wdt_enable(void)
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{
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ath79_wdt_keepalive();
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2014-04-16 03:34:41 -06:00
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/*
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* Updating the TIMER register requires a few microseconds
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* on the AR934x SoCs at least. Use a small delay to ensure
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* that the TIMER register is updated within the hardware
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* before enabling the watchdog.
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*/
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udelay(2);
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2012-12-27 07:38:26 -07:00
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ath79_wdt_wr(WDOG_REG_CTRL, WDOG_CTRL_ACTION_FCR);
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2011-12-23 11:25:42 -07:00
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/* flush write */
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2012-12-27 07:38:26 -07:00
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ath79_wdt_rr(WDOG_REG_CTRL);
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2011-01-04 13:28:19 -07:00
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}
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static inline void ath79_wdt_disable(void)
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{
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2012-12-27 07:38:26 -07:00
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ath79_wdt_wr(WDOG_REG_CTRL, WDOG_CTRL_ACTION_NONE);
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2011-12-23 11:25:42 -07:00
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/* flush write */
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2012-12-27 07:38:26 -07:00
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ath79_wdt_rr(WDOG_REG_CTRL);
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2011-01-04 13:28:19 -07:00
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}
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static int ath79_wdt_set_timeout(int val)
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{
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if (val < 1 || val > max_timeout)
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return -EINVAL;
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timeout = val;
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ath79_wdt_keepalive();
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return 0;
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}
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static int ath79_wdt_open(struct inode *inode, struct file *file)
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{
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if (test_and_set_bit(WDT_FLAGS_BUSY, &wdt_flags))
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return -EBUSY;
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clear_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags);
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ath79_wdt_enable();
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2019-03-26 14:51:19 -06:00
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return stream_open(inode, file);
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2011-01-04 13:28:19 -07:00
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}
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static int ath79_wdt_release(struct inode *inode, struct file *file)
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{
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if (test_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags))
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ath79_wdt_disable();
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else {
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2012-02-15 16:06:19 -07:00
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pr_crit("device closed unexpectedly, watchdog timer will not stop!\n");
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2011-01-04 13:28:19 -07:00
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ath79_wdt_keepalive();
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}
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clear_bit(WDT_FLAGS_BUSY, &wdt_flags);
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clear_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags);
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return 0;
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}
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static ssize_t ath79_wdt_write(struct file *file, const char *data,
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size_t len, loff_t *ppos)
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{
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if (len) {
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if (!nowayout) {
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size_t i;
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clear_bit(WDT_FLAGS_EXPECT_CLOSE, &wdt_flags);
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for (i = 0; i != len; i++) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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if (c == 'V')
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set_bit(WDT_FLAGS_EXPECT_CLOSE,
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&wdt_flags);
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}
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}
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ath79_wdt_keepalive();
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}
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return len;
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}
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static const struct watchdog_info ath79_wdt_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
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WDIOF_MAGICCLOSE | WDIOF_CARDRESET,
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.firmware_version = 0,
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.identity = "ATH79 watchdog",
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};
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static long ath79_wdt_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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int err;
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int t;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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err = copy_to_user(argp, &ath79_wdt_info,
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sizeof(ath79_wdt_info)) ? -EFAULT : 0;
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break;
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case WDIOC_GETSTATUS:
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err = put_user(0, p);
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break;
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case WDIOC_GETBOOTSTATUS:
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err = put_user(boot_status, p);
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break;
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case WDIOC_KEEPALIVE:
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ath79_wdt_keepalive();
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err = 0;
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break;
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case WDIOC_SETTIMEOUT:
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err = get_user(t, p);
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if (err)
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break;
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err = ath79_wdt_set_timeout(t);
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if (err)
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break;
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/* fallthrough */
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case WDIOC_GETTIMEOUT:
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err = put_user(timeout, p);
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break;
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default:
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err = -ENOTTY;
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break;
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}
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return err;
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}
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static const struct file_operations ath79_wdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = ath79_wdt_write,
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.unlocked_ioctl = ath79_wdt_ioctl,
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.open = ath79_wdt_open,
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.release = ath79_wdt_release,
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};
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static struct miscdevice ath79_wdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &ath79_wdt_fops,
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};
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2012-11-19 11:21:41 -07:00
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static int ath79_wdt_probe(struct platform_device *pdev)
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2011-01-04 13:28:19 -07:00
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{
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u32 ctrl;
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int err;
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2012-12-27 07:38:26 -07:00
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if (wdt_base)
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return -EBUSY;
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watchdog: Convert to use devm_platform_ioremap_resource
Use devm_platform_ioremap_resource to reduce source code size,
improve readability, and reduce the likelyhood of bugs.
The conversion was done automatically with coccinelle using the
following semantic patch.
@r@
identifier res, pdev;
expression a;
expression index;
expression e;
@@
<+...
- res = platform_get_resource(pdev, IORESOURCE_MEM, index);
- a = devm_ioremap_resource(e, res);
+ a = devm_platform_ioremap_resource(pdev, index);
...+>
@depends on r@
identifier r.res;
@@
- struct resource *res;
... when != res
@@
identifier res, pdev;
expression index;
expression a;
@@
- struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, index);
- a = devm_ioremap_resource(&pdev->dev, res);
+ a = devm_platform_ioremap_resource(pdev, index);
Cc: Joel Stanley <joel@jms.id.au>
Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Baruch Siach <baruch@tkos.co.il>
Cc: Keguang Zhang <keguang.zhang@gmail.com>
Cc: Vladimir Zapolskiy <vz@mleia.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Avi Fishman <avifishman70@gmail.com>
Cc: Nancy Yuen <yuenn@google.com>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: Wan ZongShun <mcuos.com@gmail.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Sylvain Lemieux <slemieux.tyco@gmail.com>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Barry Song <baohua@kernel.org>
Cc: Orson Zhai <orsonzhai@gmail.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Marc Gonzalez <marc.w.gonzalez@free.fr>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Tested-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Acked-by: Michal Simek <michal.simek@xilinx.com> (cadence/xilinx wdts)
Acked-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Acked-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
2019-04-02 13:01:53 -06:00
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wdt_base = devm_platform_ioremap_resource(pdev, 0);
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2013-03-03 22:06:41 -07:00
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if (IS_ERR(wdt_base))
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return PTR_ERR(wdt_base);
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2012-12-27 07:38:26 -07:00
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2012-12-27 07:38:24 -07:00
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wdt_clk = devm_clk_get(&pdev->dev, "wdt");
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2011-01-04 13:28:19 -07:00
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if (IS_ERR(wdt_clk))
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return PTR_ERR(wdt_clk);
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2014-04-16 03:35:50 -06:00
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err = clk_prepare_enable(wdt_clk);
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2011-01-04 13:28:19 -07:00
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if (err)
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2012-12-27 07:38:24 -07:00
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return err;
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2011-01-04 13:28:19 -07:00
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wdt_freq = clk_get_rate(wdt_clk);
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if (!wdt_freq) {
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err = -EINVAL;
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goto err_clk_disable;
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}
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max_timeout = (0xfffffffful / wdt_freq);
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if (timeout < 1 || timeout > max_timeout) {
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timeout = max_timeout;
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dev_info(&pdev->dev,
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"timeout value must be 0 < timeout < %d, using %d\n",
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max_timeout, timeout);
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}
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2012-12-27 07:38:26 -07:00
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ctrl = ath79_wdt_rr(WDOG_REG_CTRL);
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2011-01-04 13:28:19 -07:00
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boot_status = (ctrl & WDOG_CTRL_LAST_RESET) ? WDIOF_CARDRESET : 0;
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err = misc_register(&ath79_wdt_miscdev);
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if (err) {
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dev_err(&pdev->dev,
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"unable to register misc device, err=%d\n", err);
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goto err_clk_disable;
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}
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return 0;
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err_clk_disable:
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2014-04-16 03:35:50 -06:00
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clk_disable_unprepare(wdt_clk);
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2011-01-04 13:28:19 -07:00
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return err;
|
|
|
|
}
|
|
|
|
|
2012-11-19 11:26:24 -07:00
|
|
|
static int ath79_wdt_remove(struct platform_device *pdev)
|
2011-01-04 13:28:19 -07:00
|
|
|
{
|
|
|
|
misc_deregister(&ath79_wdt_miscdev);
|
2014-04-16 03:35:50 -06:00
|
|
|
clk_disable_unprepare(wdt_clk);
|
2011-01-04 13:28:19 -07:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void ath97_wdt_shutdown(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
ath79_wdt_disable();
|
|
|
|
}
|
|
|
|
|
2013-02-02 02:34:54 -07:00
|
|
|
#ifdef CONFIG_OF
|
|
|
|
static const struct of_device_id ath79_wdt_match[] = {
|
|
|
|
{ .compatible = "qca,ar7130-wdt" },
|
|
|
|
{},
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, ath79_wdt_match);
|
|
|
|
#endif
|
|
|
|
|
2011-01-04 13:28:19 -07:00
|
|
|
static struct platform_driver ath79_wdt_driver = {
|
2012-08-14 07:35:19 -06:00
|
|
|
.probe = ath79_wdt_probe,
|
2012-11-19 11:21:12 -07:00
|
|
|
.remove = ath79_wdt_remove,
|
2011-01-04 13:28:19 -07:00
|
|
|
.shutdown = ath97_wdt_shutdown,
|
|
|
|
.driver = {
|
|
|
|
.name = DRIVER_NAME,
|
2013-02-02 02:34:54 -07:00
|
|
|
.of_match_table = of_match_ptr(ath79_wdt_match),
|
2011-01-04 13:28:19 -07:00
|
|
|
},
|
|
|
|
};
|
|
|
|
|
2012-08-14 07:35:19 -06:00
|
|
|
module_platform_driver(ath79_wdt_driver);
|
2011-01-04 13:28:19 -07:00
|
|
|
|
|
|
|
MODULE_DESCRIPTION("Atheros AR71XX/AR724X/AR913X hardware watchdog driver");
|
|
|
|
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org");
|
|
|
|
MODULE_AUTHOR("Imre Kaloz <kaloz@openwrt.org");
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
MODULE_ALIAS("platform:" DRIVER_NAME);
|