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284 lines
6.5 KiB
284 lines
6.5 KiB
// 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 <[email protected]> |
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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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.compat_ioctl = compat_ptr_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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rdc321x_wdt_device.queue = 0; |
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rdc321x_wdt_device.default_ticks = ticks; |
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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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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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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 <[email protected]>"); |
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MODULE_DESCRIPTION("RDC321x watchdog driver"); |
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MODULE_LICENSE("GPL");
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