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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 675 mass ave cambridge ma 02139 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 441 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
285 lines
6.5 KiB
C
285 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* RDC321x watchdog driver
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*
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* Copyright (C) 2007-2010 Florian Fainelli <florian@openwrt.org>
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*
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* This driver is highly inspired from the cpu5_wdt driver
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*/
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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/errno.h>
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#include <linux/miscdevice.h>
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#include <linux/fs.h>
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#include <linux/ioport.h>
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#include <linux/timer.h>
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#include <linux/completion.h>
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#include <linux/jiffies.h>
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#include <linux/platform_device.h>
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#include <linux/watchdog.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#include <linux/mfd/rdc321x.h>
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#define RDC_WDT_MASK 0x80000000 /* Mask */
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#define RDC_WDT_EN 0x00800000 /* Enable bit */
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#define RDC_WDT_WTI 0x00200000 /* Generate CPU reset/NMI/WDT on timeout */
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#define RDC_WDT_RST 0x00100000 /* Reset bit */
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#define RDC_WDT_WIF 0x00040000 /* WDT IRQ Flag */
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#define RDC_WDT_IRT 0x00000100 /* IRQ Routing table */
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#define RDC_WDT_CNT 0x00000001 /* WDT count */
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#define RDC_CLS_TMR 0x80003844 /* Clear timer */
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#define RDC_WDT_INTERVAL (HZ/10+1)
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static int ticks = 1000;
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/* some device data */
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static struct {
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struct completion stop;
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int running;
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struct timer_list timer;
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int queue;
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int default_ticks;
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unsigned long inuse;
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spinlock_t lock;
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struct pci_dev *sb_pdev;
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int base_reg;
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} rdc321x_wdt_device;
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/* generic helper functions */
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static void rdc321x_wdt_trigger(struct timer_list *unused)
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{
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unsigned long flags;
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u32 val;
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if (rdc321x_wdt_device.running)
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ticks--;
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/* keep watchdog alive */
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spin_lock_irqsave(&rdc321x_wdt_device.lock, flags);
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pci_read_config_dword(rdc321x_wdt_device.sb_pdev,
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rdc321x_wdt_device.base_reg, &val);
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val |= RDC_WDT_EN;
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pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
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rdc321x_wdt_device.base_reg, val);
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spin_unlock_irqrestore(&rdc321x_wdt_device.lock, flags);
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/* requeue?? */
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if (rdc321x_wdt_device.queue && ticks)
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mod_timer(&rdc321x_wdt_device.timer,
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jiffies + RDC_WDT_INTERVAL);
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else {
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/* ticks doesn't matter anyway */
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complete(&rdc321x_wdt_device.stop);
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}
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}
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static void rdc321x_wdt_reset(void)
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{
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ticks = rdc321x_wdt_device.default_ticks;
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}
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static void rdc321x_wdt_start(void)
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{
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unsigned long flags;
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if (!rdc321x_wdt_device.queue) {
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rdc321x_wdt_device.queue = 1;
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/* Clear the timer */
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spin_lock_irqsave(&rdc321x_wdt_device.lock, flags);
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pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
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rdc321x_wdt_device.base_reg, RDC_CLS_TMR);
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/* Enable watchdog and set the timeout to 81.92 us */
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pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
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rdc321x_wdt_device.base_reg,
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RDC_WDT_EN | RDC_WDT_CNT);
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spin_unlock_irqrestore(&rdc321x_wdt_device.lock, flags);
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mod_timer(&rdc321x_wdt_device.timer,
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jiffies + RDC_WDT_INTERVAL);
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}
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/* if process dies, counter is not decremented */
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rdc321x_wdt_device.running++;
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}
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static int rdc321x_wdt_stop(void)
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{
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if (rdc321x_wdt_device.running)
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rdc321x_wdt_device.running = 0;
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ticks = rdc321x_wdt_device.default_ticks;
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return -EIO;
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}
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/* filesystem operations */
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static int rdc321x_wdt_open(struct inode *inode, struct file *file)
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{
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if (test_and_set_bit(0, &rdc321x_wdt_device.inuse))
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return -EBUSY;
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return stream_open(inode, file);
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}
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static int rdc321x_wdt_release(struct inode *inode, struct file *file)
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{
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clear_bit(0, &rdc321x_wdt_device.inuse);
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return 0;
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}
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static long rdc321x_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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u32 value;
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static const struct watchdog_info ident = {
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.options = WDIOF_CARDRESET,
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.identity = "RDC321x WDT",
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};
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unsigned long flags;
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switch (cmd) {
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case WDIOC_KEEPALIVE:
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rdc321x_wdt_reset();
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break;
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case WDIOC_GETSTATUS:
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/* Read the value from the DATA register */
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spin_lock_irqsave(&rdc321x_wdt_device.lock, flags);
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pci_read_config_dword(rdc321x_wdt_device.sb_pdev,
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rdc321x_wdt_device.base_reg, &value);
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spin_unlock_irqrestore(&rdc321x_wdt_device.lock, flags);
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if (copy_to_user(argp, &value, sizeof(u32)))
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return -EFAULT;
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break;
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case WDIOC_GETSUPPORT:
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if (copy_to_user(argp, &ident, sizeof(ident)))
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return -EFAULT;
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break;
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case WDIOC_SETOPTIONS:
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if (copy_from_user(&value, argp, sizeof(int)))
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return -EFAULT;
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switch (value) {
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case WDIOS_ENABLECARD:
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rdc321x_wdt_start();
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break;
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case WDIOS_DISABLECARD:
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return rdc321x_wdt_stop();
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default:
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return -EINVAL;
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}
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break;
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default:
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return -ENOTTY;
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}
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return 0;
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}
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static ssize_t rdc321x_wdt_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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if (!count)
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return -EIO;
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rdc321x_wdt_reset();
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return count;
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}
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static const struct file_operations rdc321x_wdt_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.unlocked_ioctl = rdc321x_wdt_ioctl,
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.open = rdc321x_wdt_open,
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.write = rdc321x_wdt_write,
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.release = rdc321x_wdt_release,
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};
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static struct miscdevice rdc321x_wdt_misc = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &rdc321x_wdt_fops,
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};
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static int rdc321x_wdt_probe(struct platform_device *pdev)
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{
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int err;
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struct resource *r;
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struct rdc321x_wdt_pdata *pdata;
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pdata = dev_get_platdata(&pdev->dev);
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if (!pdata) {
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dev_err(&pdev->dev, "no platform data supplied\n");
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return -ENODEV;
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}
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r = platform_get_resource_byname(pdev, IORESOURCE_IO, "wdt-reg");
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if (!r) {
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dev_err(&pdev->dev, "failed to get wdt-reg resource\n");
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return -ENODEV;
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}
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rdc321x_wdt_device.sb_pdev = pdata->sb_pdev;
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rdc321x_wdt_device.base_reg = r->start;
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err = misc_register(&rdc321x_wdt_misc);
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if (err < 0) {
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dev_err(&pdev->dev, "misc_register failed\n");
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return err;
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}
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spin_lock_init(&rdc321x_wdt_device.lock);
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/* Reset the watchdog */
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pci_write_config_dword(rdc321x_wdt_device.sb_pdev,
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rdc321x_wdt_device.base_reg, RDC_WDT_RST);
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init_completion(&rdc321x_wdt_device.stop);
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rdc321x_wdt_device.queue = 0;
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clear_bit(0, &rdc321x_wdt_device.inuse);
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timer_setup(&rdc321x_wdt_device.timer, rdc321x_wdt_trigger, 0);
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rdc321x_wdt_device.default_ticks = ticks;
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dev_info(&pdev->dev, "watchdog init success\n");
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return 0;
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}
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static int rdc321x_wdt_remove(struct platform_device *pdev)
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{
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if (rdc321x_wdt_device.queue) {
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rdc321x_wdt_device.queue = 0;
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wait_for_completion(&rdc321x_wdt_device.stop);
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}
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misc_deregister(&rdc321x_wdt_misc);
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return 0;
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}
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static struct platform_driver rdc321x_wdt_driver = {
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.probe = rdc321x_wdt_probe,
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.remove = rdc321x_wdt_remove,
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.driver = {
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.name = "rdc321x-wdt",
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},
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};
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module_platform_driver(rdc321x_wdt_driver);
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MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
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MODULE_DESCRIPTION("RDC321x watchdog driver");
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MODULE_LICENSE("GPL");
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