Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Jordan Crouse | 936 | 89.14% | 1 | 7.14% |
Wim Van Sebroeck | 55 | 5.24% | 6 | 42.86% |
Andres Salomon | 20 | 1.90% | 1 | 7.14% |
Jean Delvare | 18 | 1.71% | 1 | 7.14% |
Joe Perches | 11 | 1.05% | 1 | 7.14% |
Arnd Bergmann | 5 | 0.48% | 1 | 7.14% |
Gustavo A. R. Silva | 2 | 0.19% | 1 | 7.14% |
Thomas Gleixner | 2 | 0.19% | 1 | 7.14% |
Kirill Smelkov | 1 | 0.10% | 1 | 7.14% |
Total | 1050 | 14 |
// SPDX-License-Identifier: GPL-2.0-or-later /* Watchdog timer for machines with the CS5535/CS5536 companion chip * * Copyright (C) 2006-2007, Advanced Micro Devices, Inc. * Copyright (C) 2009 Andres Salomon <dilinger@collabora.co.uk> */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/types.h> #include <linux/miscdevice.h> #include <linux/watchdog.h> #include <linux/fs.h> #include <linux/platform_device.h> #include <linux/reboot.h> #include <linux/uaccess.h> #include <linux/cs5535.h> #define GEODEWDT_HZ 500 #define GEODEWDT_SCALE 6 #define GEODEWDT_MAX_SECONDS 131 #define WDT_FLAGS_OPEN 1 #define WDT_FLAGS_ORPHAN 2 #define DRV_NAME "geodewdt" #define WATCHDOG_NAME "Geode GX/LX WDT" #define WATCHDOG_TIMEOUT 60 static int timeout = WATCHDOG_TIMEOUT; module_param(timeout, int, 0); MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=131, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) "."); static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); static struct platform_device *geodewdt_platform_device; static unsigned long wdt_flags; static struct cs5535_mfgpt_timer *wdt_timer; static int safe_close; static void geodewdt_ping(void) { /* Stop the counter */ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, 0); /* Reset the counter */ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_COUNTER, 0); /* Enable the counter */ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, MFGPT_SETUP_CNTEN); } static void geodewdt_disable(void) { cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, 0); cs5535_mfgpt_write(wdt_timer, MFGPT_REG_COUNTER, 0); } static int geodewdt_set_heartbeat(int val) { if (val < 1 || val > GEODEWDT_MAX_SECONDS) return -EINVAL; cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, 0); cs5535_mfgpt_write(wdt_timer, MFGPT_REG_CMP2, val * GEODEWDT_HZ); cs5535_mfgpt_write(wdt_timer, MFGPT_REG_COUNTER, 0); cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, MFGPT_SETUP_CNTEN); timeout = val; return 0; } static int geodewdt_open(struct inode *inode, struct file *file) { if (test_and_set_bit(WDT_FLAGS_OPEN, &wdt_flags)) return -EBUSY; if (!test_and_clear_bit(WDT_FLAGS_ORPHAN, &wdt_flags)) __module_get(THIS_MODULE); geodewdt_ping(); return stream_open(inode, file); } static int geodewdt_release(struct inode *inode, struct file *file) { if (safe_close) { geodewdt_disable(); module_put(THIS_MODULE); } else { pr_crit("Unexpected close - watchdog is not stopping\n"); geodewdt_ping(); set_bit(WDT_FLAGS_ORPHAN, &wdt_flags); } clear_bit(WDT_FLAGS_OPEN, &wdt_flags); safe_close = 0; return 0; } static ssize_t geodewdt_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) { if (len) { if (!nowayout) { size_t i; safe_close = 0; for (i = 0; i != len; i++) { char c; if (get_user(c, data + i)) return -EFAULT; if (c == 'V') safe_close = 1; } } geodewdt_ping(); } return len; } static long geodewdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { void __user *argp = (void __user *)arg; int __user *p = argp; int interval; static const struct watchdog_info ident = { .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, .firmware_version = 1, .identity = WATCHDOG_NAME, }; switch (cmd) { case WDIOC_GETSUPPORT: return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; case WDIOC_GETSTATUS: case WDIOC_GETBOOTSTATUS: return put_user(0, p); case WDIOC_SETOPTIONS: { int options, ret = -EINVAL; if (get_user(options, p)) return -EFAULT; if (options & WDIOS_DISABLECARD) { geodewdt_disable(); ret = 0; } if (options & WDIOS_ENABLECARD) { geodewdt_ping(); ret = 0; } return ret; } case WDIOC_KEEPALIVE: geodewdt_ping(); return 0; case WDIOC_SETTIMEOUT: if (get_user(interval, p)) return -EFAULT; if (geodewdt_set_heartbeat(interval)) return -EINVAL; fallthrough; case WDIOC_GETTIMEOUT: return put_user(timeout, p); default: return -ENOTTY; } return 0; } static const struct file_operations geodewdt_fops = { .owner = THIS_MODULE, .llseek = no_llseek, .write = geodewdt_write, .unlocked_ioctl = geodewdt_ioctl, .compat_ioctl = compat_ptr_ioctl, .open = geodewdt_open, .release = geodewdt_release, }; static struct miscdevice geodewdt_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &geodewdt_fops, }; static int __init geodewdt_probe(struct platform_device *dev) { int ret; wdt_timer = cs5535_mfgpt_alloc_timer(MFGPT_TIMER_ANY, MFGPT_DOMAIN_WORKING); if (!wdt_timer) { pr_err("No timers were available\n"); return -ENODEV; } /* Set up the timer */ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_SETUP, GEODEWDT_SCALE | (3 << 8)); /* Set up comparator 2 to reset when the event fires */ cs5535_mfgpt_toggle_event(wdt_timer, MFGPT_CMP2, MFGPT_EVENT_RESET, 1); /* Set up the initial timeout */ cs5535_mfgpt_write(wdt_timer, MFGPT_REG_CMP2, timeout * GEODEWDT_HZ); ret = misc_register(&geodewdt_miscdev); return ret; } static int geodewdt_remove(struct platform_device *dev) { misc_deregister(&geodewdt_miscdev); return 0; } static void geodewdt_shutdown(struct platform_device *dev) { geodewdt_disable(); } static struct platform_driver geodewdt_driver = { .remove = geodewdt_remove, .shutdown = geodewdt_shutdown, .driver = { .name = DRV_NAME, }, }; static int __init geodewdt_init(void) { int ret; geodewdt_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0); if (IS_ERR(geodewdt_platform_device)) return PTR_ERR(geodewdt_platform_device); ret = platform_driver_probe(&geodewdt_driver, geodewdt_probe); if (ret) goto err; return 0; err: platform_device_unregister(geodewdt_platform_device); return ret; } static void __exit geodewdt_exit(void) { platform_device_unregister(geodewdt_platform_device); platform_driver_unregister(&geodewdt_driver); } module_init(geodewdt_init); module_exit(geodewdt_exit); MODULE_AUTHOR("Advanced Micro Devices, Inc"); MODULE_DESCRIPTION("Geode GX/LX Watchdog Driver"); MODULE_LICENSE("GPL");
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