// SPDX-License-Identifier: GPL-2.0+ /* * Watchdog driver for the SA11x0/PXA2xx * * (c) Copyright 2000 Oleg Drokin <[email protected]> * Based on SoftDog driver by Alan Cox <[email protected]> * * Neither Oleg Drokin nor iXcelerator.com admit liability nor provide * warranty for any of this software. This material is provided * "AS-IS" and at no charge. * * (c) Copyright 2000 Oleg Drokin <[email protected]> * * 27/11/2000 Initial release */ #define pr_fmt(fmt) … #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/clk.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/fs.h> #include <linux/platform_device.h> #include <linux/miscdevice.h> #include <linux/watchdog.h> #include <linux/init.h> #include <linux/io.h> #include <linux/bitops.h> #include <linux/uaccess.h> #include <linux/timex.h> #define REG_OSMR0 … #define REG_OSMR1 … #define REG_OSMR2 … #define REG_OSMR3 … #define REG_OSCR … #define REG_OSSR … #define REG_OWER … #define REG_OIER … #define OSSR_M3 … #define OSSR_M2 … #define OSSR_M1 … #define OSSR_M0 … #define OWER_WME … #define OIER_E3 … #define OIER_E2 … #define OIER_E1 … #define OIER_E0 … static unsigned long oscr_freq; static unsigned long sa1100wdt_users; static unsigned int pre_margin; static int boot_status; static void __iomem *reg_base; static inline void sa1100_wr(u32 val, u32 offset) { … } static inline u32 sa1100_rd(u32 offset) { … } /* * Allow only one person to hold it open */ static int sa1100dog_open(struct inode *inode, struct file *file) { … } /* * The watchdog cannot be disabled. * * Previous comments suggested that turning off the interrupt by * clearing REG_OIER[E3] would prevent the watchdog timing out but this * does not appear to be true (at least on the PXA255). */ static int sa1100dog_release(struct inode *inode, struct file *file) { … } static ssize_t sa1100dog_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) { … } static const struct watchdog_info ident = …; static long sa1100dog_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { … } static const struct file_operations sa1100dog_fops = …; static struct miscdevice sa1100dog_miscdev = …; static int margin = …; /* (secs) Default is 1 minute */ static struct clk *clk; static int sa1100dog_probe(struct platform_device *pdev) { … } static void sa1100dog_remove(struct platform_device *pdev) { … } static struct platform_driver sa1100dog_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; module_param(margin, int, 0); MODULE_PARM_DESC(…) …; MODULE_LICENSE(…) …;
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