diff options
Diffstat (limited to 'target/linux/rdc/files-2.6.30/drivers/watchdog/rdc321x_wdt.c')
| -rw-r--r-- | target/linux/rdc/files-2.6.30/drivers/watchdog/rdc321x_wdt.c | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/target/linux/rdc/files-2.6.30/drivers/watchdog/rdc321x_wdt.c b/target/linux/rdc/files-2.6.30/drivers/watchdog/rdc321x_wdt.c new file mode 100644 index 0000000000..9e8b0372d2 --- /dev/null +++ b/target/linux/rdc/files-2.6.30/drivers/watchdog/rdc321x_wdt.c @@ -0,0 +1,278 @@ +/* + * RDC321x watchdog driver + * + * Copyright (C) 2007-2010 Florian Fainelli <florian@openwrt.org> + * + * 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. + * + */ + +#include <linux/miscdevice.h> +#include <linux/platform_device.h> +#include <linux/fs.h> +#include <linux/init.h> +#include <linux/ioport.h> +#include <linux/timer.h> +#include <linux/watchdog.h> +#include <linux/uaccess.h> +#include <linux/pci.h> + +#include <asm/rdc321x_defs.h> + +extern int rdc321x_pci_write(int reg, u32 val); +extern int rdc321x_pci_read(int reg, u32 *val); + +#define RDC321X_WDT_REG 0x00000044 + +#define RDC_WDT_EN 0x00800000 /* Enable bit */ +#define RDC_WDT_WDTIRQ 0x00400000 /* Create WDT IRQ before CPU reset */ +#define RDC_WDT_NMIIRQ 0x00200000 /* Create NMI IRQ before CPU reset */ +#define RDC_WDT_RST 0x00100000 /* Reset wdt */ +#define RDC_WDT_NIF 0x00080000 /* NMI interrupt occured */ +#define RDC_WDT_WIF 0x00040000 /* WDT interrupt occured */ +#define RDC_WDT_IRT 0x00000700 /* IRQ Routing table */ +#define RDC_WDT_CNT 0x0000007F /* WDT count */ + +/* default counter value (2.34 s) */ +#define RDC_WDT_DFLT_CNT 0x00000040 + +#define RDC_WDT_SETUP (RDC_WDT_EN | RDC_WDT_NMIIRQ | RDC_WDT_RST | RDC_WDT_DFLT_CNT) + +/* some device data */ +static struct { + struct timer_list timer; + int seconds_left; + int total_seconds; + bool inuse; + bool running; + bool close_expected; +} rdc321x_wdt_dev; + +static struct watchdog_info ident = { + .options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, + .identity = "RDC321x WDT", +}; + +/* generic helper functions */ +static void rdc321x_wdt_timer(unsigned long unused) +{ + if (!rdc321x_wdt_dev.running) { + rdc321x_pci_write(RDC321X_WDT_REG, 0); + return; + } + + rdc321x_wdt_dev.seconds_left--; + + if (rdc321x_wdt_dev.seconds_left < 1) + return; + + rdc321x_pci_write(RDC321X_WDT_REG, RDC_WDT_SETUP); + + mod_timer(&rdc321x_wdt_dev.timer, HZ * 2 + jiffies); +} + +static void rdc321x_wdt_reset(void) +{ + rdc321x_wdt_dev.seconds_left = rdc321x_wdt_dev.total_seconds; +} + +static void rdc321x_wdt_start(void) +{ + if (rdc321x_wdt_dev.running) + return; + + rdc321x_wdt_dev.seconds_left = rdc321x_wdt_dev.total_seconds; + + rdc321x_wdt_dev.running = true; + + rdc321x_wdt_timer(0); + + return; +} + +static int rdc321x_wdt_stop(void) +{ + if (WATCHDOG_NOWAYOUT) + return -ENOSYS; + + rdc321x_wdt_dev.running = false; + + return 0; +} + +/* filesystem operations */ +static int rdc321x_wdt_open(struct inode *inode, struct file *file) +{ + if (xchg(&rdc321x_wdt_dev.inuse, true)) + return -EBUSY; + + return nonseekable_open(inode, file); +} + +static int rdc321x_wdt_release(struct inode *inode, struct file *file) +{ + if (rdc321x_wdt_dev.close_expected) + rdc321x_wdt_stop(); + + rdc321x_wdt_dev.inuse = false; + + return 0; +} + +static long rdc321x_wdt_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + void __user *argp = (void __user *)arg; + int value; + + switch (cmd) { + case WDIOC_KEEPALIVE: + rdc321x_wdt_reset(); + break; + case WDIOC_GETSUPPORT: + if (copy_to_user(argp, &ident, sizeof(ident))) + return -EFAULT; + break; + case WDIOC_SETTIMEOUT: + if (copy_from_user(&rdc321x_wdt_dev.total_seconds, argp, sizeof(int))) + return -EFAULT; + rdc321x_wdt_dev.seconds_left = rdc321x_wdt_dev.total_seconds; + break; + case WDIOC_GETTIMEOUT: + if (copy_to_user(argp, &rdc321x_wdt_dev.total_seconds, sizeof(int))) + return -EFAULT; + break; + case WDIOC_GETTIMELEFT: + if (copy_to_user(argp, &rdc321x_wdt_dev.seconds_left, sizeof(int))) + return -EFAULT; + break; + case WDIOC_SETOPTIONS: + if (copy_from_user(&value, argp, sizeof(int))) + return -EFAULT; + switch (value) { + case WDIOS_ENABLECARD: + rdc321x_wdt_start(); + break; + case WDIOS_DISABLECARD: + return rdc321x_wdt_stop(); + default: + return -EINVAL; + } + break; + default: + return -EINVAL; + } + return 0; +} + +static ssize_t rdc321x_wdt_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + size_t i; + + if (!count) + return -EIO; + + rdc321x_wdt_dev.close_expected = false; + + for (i = 0; i != count; i++) { + char c; + + if (get_user(c, buf + i)) + return -EFAULT; + + if (c == 'V') { + rdc321x_wdt_dev.close_expected = true; + break; + } + } + + rdc321x_wdt_reset(); + + return count; +} + +static const struct file_operations rdc321x_wdt_fops = { + .llseek = no_llseek, + .unlocked_ioctl = rdc321x_wdt_ioctl, + .open = rdc321x_wdt_open, + .write = rdc321x_wdt_write, + .release = rdc321x_wdt_release, +}; + +static struct miscdevice rdc321x_wdt_misc = { + .minor = WATCHDOG_MINOR, + .name = "watchdog", + .fops = &rdc321x_wdt_fops, +}; + +static int __init rdc321x_wdt_probe(struct platform_device *pdev) +{ + int err; + + err = rdc321x_pci_write(RDC321X_WDT_REG, 0); + if (err) + return err; + + rdc321x_wdt_dev.running = false; + rdc321x_wdt_dev.close_expected = false; + rdc321x_wdt_dev.inuse = 0; + setup_timer(&rdc321x_wdt_dev.timer, rdc321x_wdt_timer, 0); + rdc321x_wdt_dev.total_seconds = 100; + + err = misc_register(&rdc321x_wdt_misc); + if (err < 0) { + printk(KERN_ERR PFX "watchdog: misc_register failed\n"); + return err; + } + + panic_on_unrecovered_nmi = 1; + dev_info(&pdev->dev, "watchdog inig success\n"); + + return 0; +} + +static int __devexit rdc321x_wdt_remove(struct platform_device *pdev) +{ + if (rdc321x_wdt_dev.inuse) + rdc321x_wdt_dev.inuse = 0; + misc_deregister(&rdc321x_wdt_misc); + return 0; +} + +static struct platform_driver rdc321x_wdt_driver = { + .driver.name = "rdc321x-wdt", + .driver.owner = THIS_MODULE, + .probe = rdc321x_wdt_probe, + .remove = __devexit_p(rdc321x_wdt_remove), +}; + +static int __init rdc321x_wdt_init(void) +{ + return platform_driver_register(&rdc321x_wdt_driver); +} + +static void __exit rdc321x_wdt_exit(void) +{ + platform_driver_unregister(&rdc321x_wdt_driver); +} + +module_init(rdc321x_wdt_init); +module_exit(rdc321x_wdt_exit); + +MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); +MODULE_DESCRIPTION("RDC321x Watchdog driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:rdc321x-wdt"); |