mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19815 3c298f89-4303-0410-b956-a3cf2f4a3e73
631 lines
15 KiB
C
631 lines
15 KiB
C
/*
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* drivers/watchdog/ubi32_wdt.c
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* Ubicom32 Watchdog Driver
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*
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* Originally based on softdog.c
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* Copyright 2006-2007 Analog Devices Inc.
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* Copyright 2006-2007 Michele d'Amico
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* Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>
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* (C) Copyright 2009, Ubicom, Inc.
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*
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* This file is part of the Ubicom32 Linux Kernel Port.
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*
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* The Ubicom32 Linux Kernel Port is free software: you can redistribute
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* it and/or modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, either version 2 of the
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* License, or (at your option) any later version.
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*
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* The Ubicom32 Linux Kernel Port is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the Ubicom32 Linux Kernel Port. If not,
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* see <http://www.gnu.org/licenses/>.
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*
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* Ubicom32 implementation derived from (with many thanks):
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* arch/m68knommu
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* arch/blackfin
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* arch/parisc
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*/
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/timer.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/fs.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/uaccess.h>
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#include <asm/ip5000.h>
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#define WATCHDOG_NAME "ubi32-wdt"
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#define PFX WATCHDOG_NAME ": "
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#define OSC1_FREQ 12000000
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#define WATCHDOG_SEC_TO_CYC(x) (OSC1_FREQ * (x))
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#define WATCHDOG_MAX_SEC (0xffffffff / OSC1_FREQ)
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#define MIN_PROCESSOR_ADDRESS 0x03000000
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static DEFINE_SPINLOCK(ubi32_wdt_spinlock);
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#define WATCHDOG_TIMEOUT 20
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#if defined(CONFIG_WATCHDOG_NOWAYOUT)
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#define WATCHDOG_NOWAYOUT 1
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#else
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#define WATCHDOG_NOWAYOUT 0
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#endif
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static unsigned int timeout = WATCHDOG_TIMEOUT;
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static int nowayout = WATCHDOG_NOWAYOUT;
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static struct watchdog_info ubi32_wdt_info;
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static unsigned long open_check;
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static char expect_close;
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#if !defined(CONFIG_SMP)
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#define UBI32_WDT_LOCK(lock, flags) local_irq_save(flags)
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#define UBI32_WDT_UNLOCK(lock, flags) local_irq_restore(flags)
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#define UBI32_WDT_LOCK_CHECK()
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#else
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#define UBI32_WDT_LOCK(lock, flags) spin_lock_irqsave((lock), (flags));
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#define UBI32_WDT_UNLOCK(lock, flags) spin_unlock_irqrestore((lock), (flags));
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#define UBI32_WDT_LOCK_CHECK() BUG_ON(!spin_is_locked(&ubi32_wdt_spinlock));
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#endif
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/*
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* ubi32_wdt_remaining()
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* Return the approximate number of seconds remaining
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*/
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static int ubi32_wdt_remaining(void)
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{
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int compare;
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int curr;
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UBI32_WDT_LOCK_CHECK();
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ubicom32_write_reg(&UBICOM32_IO_TIMER->tkey, TIMER_TKEYVAL);
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compare = ubicom32_read_reg(&UBICOM32_IO_TIMER->wdcom);
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curr = ubicom32_read_reg(&UBICOM32_IO_TIMER->mptval);
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ubicom32_write_reg(&UBICOM32_IO_TIMER->tkey, 0);
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return (compare - curr) / OSC1_FREQ;
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}
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/*
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* ubi32_wdt_keepalive()
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* Keep the Userspace Watchdog Alive
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*
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* The Userspace watchdog got a KeepAlive: schedule the next timeout.
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*/
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static int ubi32_wdt_keepalive(void)
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{
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UBI32_WDT_LOCK_CHECK();
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ubicom32_write_reg(&UBICOM32_IO_TIMER->tkey, TIMER_TKEYVAL);
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ubicom32_write_reg(&UBICOM32_IO_TIMER->wdcom,
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ubicom32_read_reg(&UBICOM32_IO_TIMER->mptval)
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+ WATCHDOG_SEC_TO_CYC(timeout));
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ubicom32_write_reg(&UBICOM32_IO_TIMER->tkey, 0);
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return 0;
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}
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/*
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* ubi32_wdt_stop()
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* Stop the on-chip Watchdog
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*/
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static int ubi32_wdt_stop(void)
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{
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UBI32_WDT_LOCK_CHECK();
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ubicom32_write_reg(&UBICOM32_IO_TIMER->tkey, TIMER_TKEYVAL);
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ubicom32_write_reg(&UBICOM32_IO_TIMER->wdcfg, TIMER_WATCHDOG_DISABLE);
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ubicom32_write_reg(&UBICOM32_IO_TIMER->tkey, 0);
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return 0;
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}
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/*
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* ubi32_wdt_start()
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* Start the on-chip Watchdog
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*/
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static int ubi32_wdt_start(void)
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{
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UBI32_WDT_LOCK_CHECK();
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ubicom32_write_reg(&UBICOM32_IO_TIMER->tkey, TIMER_TKEYVAL);
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ubicom32_write_reg(&UBICOM32_IO_TIMER->wdcom,
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ubicom32_read_reg(&UBICOM32_IO_TIMER->mptval)
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+ WATCHDOG_SEC_TO_CYC(timeout));
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ubicom32_write_reg(&UBICOM32_IO_TIMER->wdcfg, ~TIMER_WATCHDOG_DISABLE);
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ubicom32_write_reg(&UBICOM32_IO_TIMER->tkey, 0);
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return 0;
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}
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/*
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* ubi32_wdt_running()
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* Return true if the watchdog is configured
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*/
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static int ubi32_wdt_running(void)
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{
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int enabled;
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UBI32_WDT_LOCK_CHECK();
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ubicom32_write_reg(&UBICOM32_IO_TIMER->tkey, TIMER_TKEYVAL);
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enabled = ubicom32_read_reg(&UBICOM32_IO_TIMER->wdcfg) == ~TIMER_WATCHDOG_DISABLE;
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ubicom32_write_reg(&UBICOM32_IO_TIMER->tkey, 0);
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return enabled;
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}
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/*
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* ubi32_wdt_set_timeout()
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* Set the Userspace Watchdog timeout
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*
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* - @t: new timeout value (in seconds)
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*/
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static int ubi32_wdt_set_timeout(unsigned long t)
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{
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UBI32_WDT_LOCK_CHECK();
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if (t > WATCHDOG_MAX_SEC) {
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printk(KERN_WARNING PFX "request to large: %ld [1-%d] sec)\n", t, WATCHDOG_MAX_SEC);
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return -EINVAL;
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}
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/*
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* If we are running, then reset the time value so
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* that the new value has an immediate effect.
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*/
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timeout = t;
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if (ubi32_wdt_running()) {
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ubi32_wdt_keepalive();
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}
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return 0;
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}
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/*
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* ubi32_wdt_open()
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* Open the Device
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*/
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static int ubi32_wdt_open(struct inode *inode, struct file *file)
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{
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unsigned long flags;
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if (test_and_set_bit(0, &open_check))
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return -EBUSY;
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if (nowayout)
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__module_get(THIS_MODULE);
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spin_lock_irqsave(&ubi32_wdt_spinlock, flags);
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ubi32_wdt_start();
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spin_unlock_irqrestore(&ubi32_wdt_spinlock, flags);
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return nonseekable_open(inode, file);
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}
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/*
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* ubi32_wdt_close()
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* Close the Device
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*/
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static int ubi32_wdt_release(struct inode *inode, struct file *file)
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{
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unsigned long flags;
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/*
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* If we don't expect a close, then the watchdog continues
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* even though the device is closed. The caller will have
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* a full timeout value to reopen the device and continue
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* stroking it.
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*/
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if (expect_close != 42) {
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printk(KERN_CRIT PFX
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"Unexpected close, not stopping watchdog!\n");
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spin_lock_irqsave(&ubi32_wdt_spinlock, flags);
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ubi32_wdt_keepalive();
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spin_unlock_irqrestore(&ubi32_wdt_spinlock, flags);
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} else {
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spin_lock_irqsave(&ubi32_wdt_spinlock, flags);
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ubi32_wdt_stop();
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spin_unlock_irqrestore(&ubi32_wdt_spinlock, flags);
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}
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expect_close = 0;
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clear_bit(0, &open_check);
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return 0;
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}
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/*
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* ubi32_wdt_write()
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* Write to Device
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*
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* If the user writes nothing, nothing happens.
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* If the user writes a V, then we expect a close and allow a release.
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* If the user writes anything else, it is ignored.
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*/
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static ssize_t ubi32_wdt_write(struct file *file, const char __user *data,
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size_t len, loff_t *ppos)
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{
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size_t i;
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unsigned long flags;
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/*
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* Every write resets the expect_close. The last write
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* must be a V to allow shutdown on close.
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*/
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expect_close = 0;
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/*
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* Empty writes still ping.
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*/
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if (!len) {
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goto ping;
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}
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/*
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* If nowayout is set, it does not matter if the caller
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* is trying to send the magic 'V' we will not allow a
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* close to stop us.
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*/
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if (nowayout) {
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goto ping;
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}
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/*
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* See if the program wrote a 'V' and if so disable
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* the watchdog on release.
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*/
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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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}
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if (c == 'V') {
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expect_close = 42;
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}
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}
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ping:
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spin_lock_irqsave(&ubi32_wdt_spinlock, flags);
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ubi32_wdt_keepalive();
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spin_unlock_irqrestore(&ubi32_wdt_spinlock, flags);
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return len;
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}
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/*
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* ubi32_wdt_ioctl()
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* Query the watchdog device.
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*
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* Query basic information from the device or ping it, as outlined by the
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* watchdog API.
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*/
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static long ubi32_wdt_ioctl(struct file *file,
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unsigned int cmd, 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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switch (cmd) {
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case WDIOC_GETSUPPORT:
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if (copy_to_user(argp, &ubi32_wdt_info, sizeof(ubi32_wdt_info))) {
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return -EFAULT;
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}
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return 0;
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case WDIOC_GETSTATUS: {
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unsigned long flags;
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int running;
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spin_lock_irqsave(&ubi32_wdt_spinlock, flags);
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running = ubi32_wdt_running();
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spin_unlock_irqrestore(&ubi32_wdt_spinlock, flags);
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return running;
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}
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case WDIOC_GETBOOTSTATUS:
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return ubicom32_get_reset_reason();
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case WDIOC_SETOPTIONS: {
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unsigned long flags;
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int options, ret = -EINVAL;
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/*
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* The sample application does not pass a pointer
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* but directly passes a value of 1 or 2; however
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* all of the implementations (and thus probably
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* the real applications) pass a pointer to a value.
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*
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* It should be noted that WDIOC_SETOPTIONS is defined as
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* _IOR(WATCHDOG_IOCTL_BASE, 4, int), which means
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* that it should be an int and NOT a pointer.
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*
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* TODO: Examine this code for future chips.
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* TODO: Report the sample code defect.
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*/
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if ((int)p < MIN_PROCESSOR_ADDRESS) {
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options = (int)p;
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} else {
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if (get_user(options, p))
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return -EFAULT;
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}
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spin_lock_irqsave(&ubi32_wdt_spinlock, flags);
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if (options & WDIOS_DISABLECARD) {
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ubi32_wdt_stop();
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ret = 0;
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}
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if (options & WDIOS_ENABLECARD) {
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ubi32_wdt_start();
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ret = 0;
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}
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spin_unlock_irqrestore(&ubi32_wdt_spinlock, flags);
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return ret;
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}
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case WDIOC_KEEPALIVE: {
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unsigned long flags;
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spin_lock_irqsave(&ubi32_wdt_spinlock, flags);
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ubi32_wdt_keepalive();
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spin_unlock_irqrestore(&ubi32_wdt_spinlock, flags);
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return 0;
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}
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case WDIOC_SETTIMEOUT: {
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int new_timeout;
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unsigned long flags;
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int ret = 0;
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if (get_user(new_timeout, p))
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return -EFAULT;
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spin_lock_irqsave(&ubi32_wdt_spinlock, flags);
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ret = ubi32_wdt_set_timeout(new_timeout);
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spin_unlock_irqrestore(&ubi32_wdt_spinlock, flags);
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return ret;
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}
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case WDIOC_GETTIMEOUT:
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return put_user(timeout, p);
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case WDIOC_GETTIMELEFT: {
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unsigned long flags;
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int remaining = 0;
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spin_lock_irqsave(&ubi32_wdt_spinlock, flags);
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remaining = ubi32_wdt_remaining();
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spin_unlock_irqrestore(&ubi32_wdt_spinlock, flags);
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return put_user(remaining, p);
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}
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default:
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return -ENOTTY;
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}
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}
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/*
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* ubi32_wdt_notify_sys()
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* Notification callback function for system events.
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*
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* Turn off the watchdog during a SYS_DOWN or SYS_HALT.
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*/
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static int ubi32_wdt_notify_sys(struct notifier_block *this,
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unsigned long code, void *unused)
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{
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if (code == SYS_DOWN || code == SYS_HALT) {
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unsigned long flags;
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spin_lock_irqsave(&ubi32_wdt_spinlock, flags);
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ubi32_wdt_stop();
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spin_unlock_irqrestore(&ubi32_wdt_spinlock, flags);
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}
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return NOTIFY_DONE;
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}
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|
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#ifdef CONFIG_PM
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static int state_before_suspend;
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/*
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* ubi32_wdt_suspend()
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* suspend the watchdog
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*
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* Remember if the watchdog was running and stop it.
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*/
|
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static int ubi32_wdt_suspend(struct platform_device *pdev, pm_message_t state)
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{
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unsigned long flags;
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spin_lock_irqsave(&ubi32_wdt_spinlock, flags);
|
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state_before_suspend = ubi32_wdt_running();
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ubi32_wdt_stop();
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spin_unlock_irqrestore(&ubi32_wdt_spinlock, flags);
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|
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return 0;
|
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}
|
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|
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/*
|
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* ubi32_wdt_resume()
|
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* Resume the watchdog
|
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*
|
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* If the watchdog was running, turn it back on.
|
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*/
|
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static int ubi32_wdt_resume(struct platform_device *pdev)
|
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{
|
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if (state_before_suspend) {
|
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unsigned long flags;
|
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spin_lock_irqsave(&ubi32_wdt_spinlock, flags);
|
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ubi32_wdt_set_timeout(timeout);
|
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ubi32_wdt_start();
|
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spin_unlock_irqrestore(&ubi32_wdt_spinlock, flags);
|
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}
|
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|
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return 0;
|
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}
|
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#else
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# define ubi32_wdt_suspend NULL
|
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# define ubi32_wdt_resume NULL
|
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#endif
|
|
|
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static const struct file_operations ubi32_wdt_fops = {
|
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.owner = THIS_MODULE,
|
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.llseek = no_llseek,
|
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.write = ubi32_wdt_write,
|
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.unlocked_ioctl = ubi32_wdt_ioctl,
|
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.open = ubi32_wdt_open,
|
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.release = ubi32_wdt_release,
|
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};
|
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|
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static struct miscdevice ubi32_wdt_miscdev = {
|
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.minor = WATCHDOG_MINOR,
|
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.name = "watchdog",
|
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.fops = &ubi32_wdt_fops,
|
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};
|
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|
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static struct watchdog_info ubi32_wdt_info = {
|
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.identity = "Ubicom32 Watchdog",
|
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.options = WDIOF_SETTIMEOUT |
|
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WDIOF_KEEPALIVEPING |
|
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WDIOF_MAGICCLOSE,
|
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};
|
|
|
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static struct notifier_block ubi32_wdt_notifier = {
|
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.notifier_call = ubi32_wdt_notify_sys,
|
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};
|
|
|
|
/*
|
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* ubi32_wdt_probe()
|
|
* Probe/register the watchdog module
|
|
*
|
|
* Registers the misc device and notifier handler. Actual device
|
|
* initialization is handled by ubi32_wdt_open().
|
|
*/
|
|
static int __devinit ubi32_wdt_probe(struct platform_device *pdev)
|
|
{
|
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int ret;
|
|
|
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ret = register_reboot_notifier(&ubi32_wdt_notifier);
|
|
if (ret) {
|
|
printk(KERN_ERR PFX
|
|
"cannot register reboot notifier (err=%d)\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = misc_register(&ubi32_wdt_miscdev);
|
|
if (ret) {
|
|
printk(KERN_ERR PFX
|
|
"cannot register miscdev on minor=%d (err=%d)\n",
|
|
WATCHDOG_MINOR, ret);
|
|
unregister_reboot_notifier(&ubi32_wdt_notifier);
|
|
return ret;
|
|
}
|
|
|
|
printk(KERN_INFO PFX "initialized: timeout=%d sec (nowayout=%d)\n",
|
|
timeout, nowayout);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ubi32_wdt_remove()
|
|
* Uninstall the module
|
|
*
|
|
* Unregisters the misc device and notifier handler. Actual device
|
|
* deinitialization is handled by ubi32_wdt_close().
|
|
*/
|
|
static int __devexit ubi32_wdt_remove(struct platform_device *pdev)
|
|
{
|
|
misc_deregister(&ubi32_wdt_miscdev);
|
|
unregister_reboot_notifier(&ubi32_wdt_notifier);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_device *ubi32_wdt_device;
|
|
|
|
static struct platform_driver ubi32_wdt_driver = {
|
|
.probe = ubi32_wdt_probe,
|
|
.remove = __devexit_p(ubi32_wdt_remove),
|
|
.suspend = ubi32_wdt_suspend,
|
|
.resume = ubi32_wdt_resume,
|
|
.driver = {
|
|
.name = WATCHDOG_NAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
/*
|
|
* ubi32_wdt_init()
|
|
* Initialize the watchdog.
|
|
*
|
|
* Checks the module params and registers the platform device & driver.
|
|
* Real work is in the platform probe function.
|
|
*/
|
|
static int __init ubi32_wdt_init(void)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
/*
|
|
* Check that the timeout value is within range
|
|
*/
|
|
spin_lock_irqsave(&ubi32_wdt_spinlock, flags);
|
|
ret = ubi32_wdt_set_timeout(timeout);
|
|
spin_unlock_irqrestore(&ubi32_wdt_spinlock, flags);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Since this is an on-chip device and needs no board-specific
|
|
* resources, we'll handle all the platform device stuff here.
|
|
*/
|
|
ret = platform_driver_register(&ubi32_wdt_driver);
|
|
if (ret) {
|
|
printk(KERN_ERR PFX "unable to register driver\n");
|
|
return ret;
|
|
}
|
|
|
|
ubi32_wdt_device = platform_device_register_simple(WATCHDOG_NAME, -1, NULL, 0);
|
|
if (IS_ERR(ubi32_wdt_device)) {
|
|
printk(KERN_ERR PFX "unable to register device\n");
|
|
platform_driver_unregister(&ubi32_wdt_driver);
|
|
return PTR_ERR(ubi32_wdt_device);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ubi32_wdt_exit()
|
|
* Deinitialize module
|
|
*
|
|
* Back out the platform device & driver steps. Real work is in the
|
|
* platform remove function.
|
|
*/
|
|
static void __exit ubi32_wdt_exit(void)
|
|
{
|
|
platform_device_unregister(ubi32_wdt_device);
|
|
platform_driver_unregister(&ubi32_wdt_driver);
|
|
}
|
|
|
|
module_init(ubi32_wdt_init);
|
|
module_exit(ubi32_wdt_exit);
|
|
|
|
MODULE_AUTHOR("Sol Kavy<sol@ubicom.com>");
|
|
MODULE_DESCRIPTION("Ubicom32 Watchdog Device Driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
|
|
|
module_param(timeout, uint, 0);
|
|
MODULE_PARM_DESC(timeout,
|
|
"Watchdog timeout in seconds. (1<=timeout<=((2^32)/SCLK), default="
|
|
__MODULE_STRING(WATCHDOG_TIMEOUT) ")");
|
|
|
|
module_param(nowayout, int, 0);
|
|
MODULE_PARM_DESC(nowayout,
|
|
"Watchdog cannot be stopped once started (default="
|
|
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|