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2c5c4009fb
As the userspace has no means to determine the maximum possible timeout, use that as the default and let the userspace lower it when necessary. As the result the usual OpenWrt install (with busybox's watchdog trying to set the timeout to 60s on start) is using a 33s timeout on an RT3052 clocked at 384MHz instead of the current 20s default. Signed-off-by: Paul Fertser <fercerpav@gmail.com> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33144 3c298f89-4303-0410-b956-a3cf2f4a3e73
356 lines
8.0 KiB
C
356 lines
8.0 KiB
C
/*
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* Ralink RT288X/RT305X built-in hardware watchdog timer
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*
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* Copyright (C) 2011 Gabor Juhos <juhosg@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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* parts of the driver are based on Ralink's 2.6.21 BSP
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/bitops.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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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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#define DRIVER_NAME "ramips-wdt"
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#define RAMIPS_WDT_TIMEOUT 0 /* seconds */
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#define RAMIPS_WDT_PRESCALE 65536
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#define TIMER_REG_TMRSTAT 0x00
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#define TIMER_REG_TMR1LOAD 0x20
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#define TIMER_REG_TMR1CTL 0x28
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#define TMRSTAT_TMR1RST BIT(5)
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#define TMR1CTL_ENABLE BIT(7)
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#define TMR1CTL_MODE_SHIFT 4
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#define TMR1CTL_MODE_MASK 0x3
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#define TMR1CTL_MODE_FREE_RUNNING 0x0
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#define TMR1CTL_MODE_PERIODIC 0x1
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#define TMR1CTL_MODE_TIMEOUT 0x2
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#define TMR1CTL_MODE_WDT 0x3
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#define TMR1CTL_PRESCALE_MASK 0xf
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#define TMR1CTL_PRESCALE_65536 0xf
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static int nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, int, 0);
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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 ramips_wdt_timeout = RAMIPS_WDT_TIMEOUT;
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module_param_named(timeout, ramips_wdt_timeout, int, 0);
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MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds, 0 means use maximum "
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"(default=" __MODULE_STRING(RAMIPS_WDT_TIMEOUT) "s)");
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static unsigned long ramips_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 *ramips_wdt_clk;
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static unsigned long ramips_wdt_freq;
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static int ramips_wdt_max_timeout;
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static void __iomem *ramips_wdt_base;
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static inline void ramips_wdt_wr(unsigned reg, u32 val)
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{
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__raw_writel(val, ramips_wdt_base + reg);
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}
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static inline u32 ramips_wdt_rr(unsigned reg)
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{
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return __raw_readl(ramips_wdt_base + reg);
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}
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static inline void ramips_wdt_keepalive(void)
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{
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ramips_wdt_wr(TIMER_REG_TMR1LOAD, ramips_wdt_timeout * ramips_wdt_freq);
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}
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static inline void ramips_wdt_enable(void)
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{
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u32 t;
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ramips_wdt_keepalive();
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t = ramips_wdt_rr(TIMER_REG_TMR1CTL);
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t |= TMR1CTL_ENABLE;
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ramips_wdt_wr(TIMER_REG_TMR1CTL, t);
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}
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static inline void ramips_wdt_disable(void)
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{
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u32 t;
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ramips_wdt_keepalive();
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t = ramips_wdt_rr(TIMER_REG_TMR1CTL);
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t &= ~TMR1CTL_ENABLE;
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ramips_wdt_wr(TIMER_REG_TMR1CTL, t);
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}
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static int ramips_wdt_set_timeout(int val)
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{
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if (val < 1 || val > ramips_wdt_max_timeout) {
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pr_warn(DRIVER_NAME
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": timeout value %d must be 0 < timeout <= %d, using %d\n",
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val, ramips_wdt_max_timeout, ramips_wdt_timeout);
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return -EINVAL;
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}
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ramips_wdt_timeout = val;
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ramips_wdt_keepalive();
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return 0;
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}
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static int ramips_wdt_open(struct inode *inode, struct file *file)
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{
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u32 t;
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if (test_and_set_bit(WDT_FLAGS_BUSY, &ramips_wdt_flags))
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return -EBUSY;
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clear_bit(WDT_FLAGS_EXPECT_CLOSE, &ramips_wdt_flags);
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t = ramips_wdt_rr(TIMER_REG_TMR1CTL);
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t &= ~(TMR1CTL_MODE_MASK << TMR1CTL_MODE_SHIFT |
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TMR1CTL_PRESCALE_MASK);
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t |= (TMR1CTL_MODE_WDT << TMR1CTL_MODE_SHIFT |
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TMR1CTL_PRESCALE_65536);
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ramips_wdt_wr(TIMER_REG_TMR1CTL, t);
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ramips_wdt_enable();
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return nonseekable_open(inode, file);
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}
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static int ramips_wdt_release(struct inode *inode, struct file *file)
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{
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if (test_bit(WDT_FLAGS_EXPECT_CLOSE, &ramips_wdt_flags))
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ramips_wdt_disable();
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else {
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pr_crit(DRIVER_NAME ": device closed unexpectedly, "
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"watchdog timer will not stop!\n");
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ramips_wdt_keepalive();
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}
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clear_bit(WDT_FLAGS_BUSY, &ramips_wdt_flags);
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clear_bit(WDT_FLAGS_EXPECT_CLOSE, &ramips_wdt_flags);
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return 0;
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}
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static ssize_t ramips_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, &ramips_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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&ramips_wdt_flags);
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}
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}
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ramips_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 ramips_wdt_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
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WDIOF_MAGICCLOSE,
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.firmware_version = 0,
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.identity = "RAMIPS watchdog",
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};
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static long ramips_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, &ramips_wdt_info,
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sizeof(ramips_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_KEEPALIVE:
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ramips_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 = ramips_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(ramips_wdt_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 ramips_wdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = ramips_wdt_write,
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.unlocked_ioctl = ramips_wdt_ioctl,
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.open = ramips_wdt_open,
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.release = ramips_wdt_release,
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};
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static struct miscdevice ramips_wdt_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &ramips_wdt_fops,
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};
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static int __devinit ramips_wdt_probe(struct platform_device *pdev)
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{
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struct resource *res;
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int err;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(&pdev->dev, "no memory resource found\n");
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return -EINVAL;
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}
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ramips_wdt_base = ioremap(res->start, resource_size(res));
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if (!ramips_wdt_base)
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return -ENOMEM;
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ramips_wdt_clk = clk_get(&pdev->dev, "wdt");
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if (IS_ERR(ramips_wdt_clk)) {
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err = PTR_ERR(ramips_wdt_clk);
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goto err_unmap;
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}
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err = clk_enable(ramips_wdt_clk);
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if (err)
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goto err_clk_put;
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ramips_wdt_freq = clk_get_rate(ramips_wdt_clk) / RAMIPS_WDT_PRESCALE;
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if (!ramips_wdt_freq) {
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err = -EINVAL;
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goto err_clk_disable;
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}
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ramips_wdt_max_timeout = (0xfffful / ramips_wdt_freq);
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if (ramips_wdt_timeout < 1 ||
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ramips_wdt_timeout > ramips_wdt_max_timeout) {
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ramips_wdt_timeout = ramips_wdt_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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ramips_wdt_max_timeout, ramips_wdt_timeout);
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}
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err = misc_register(&ramips_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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clk_disable(ramips_wdt_clk);
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err_clk_put:
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clk_put(ramips_wdt_clk);
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err_unmap:
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iounmap(ramips_wdt_base);
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return err;
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}
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static int __devexit ramips_wdt_remove(struct platform_device *pdev)
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{
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misc_deregister(&ramips_wdt_miscdev);
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clk_disable(ramips_wdt_clk);
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clk_put(ramips_wdt_clk);
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iounmap(ramips_wdt_base);
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return 0;
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}
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static void ramips_wdt_shutdown(struct platform_device *pdev)
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{
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ramips_wdt_disable();
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}
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static struct platform_driver ramips_wdt_driver = {
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.remove = __devexit_p(ramips_wdt_remove),
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.shutdown = ramips_wdt_shutdown,
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.driver = {
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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},
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};
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static int __init ramips_wdt_init(void)
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{
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return platform_driver_probe(&ramips_wdt_driver, ramips_wdt_probe);
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}
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module_init(ramips_wdt_init);
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static void __exit ramips_wdt_exit(void)
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{
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platform_driver_unregister(&ramips_wdt_driver);
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}
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module_exit(ramips_wdt_exit);
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MODULE_DESCRIPTION("Ralink RT288X/RT305X hardware watchdog driver");
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MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:" DRIVER_NAME);
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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