This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / drivers / char / watchdog / mpc8xx_wdt.c

diff --git a/drivers/char/watchdog/mpc8xx_wdt.c b/drivers/char/watchdog/mpc8xx_wdt.c
new file mode 100644 (file)
index 0000000..56d62ba
--- /dev/null
+++ b/drivers/char/watchdog/mpc8xx_wdt.c
@@ -0,0 +1,164 @@
+/*
+ * mpc8xx_wdt.c - MPC8xx watchdog userspace interface
+ *
+ * Author: Florian Schirmer <jolt@tuxbox.org>
+ *
+ * 2002 (c) Florian Schirmer <jolt@tuxbox.org> This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include <linux/config.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/watchdog.h>
+#include <asm/8xx_immap.h>
+#include <asm/uaccess.h>
+#include <syslib/m8xx_wdt.h>
+
+static unsigned long wdt_opened;
+static int wdt_status;
+
+static void mpc8xx_wdt_handler_disable(void)
+{
+       volatile immap_t *imap = (volatile immap_t *)IMAP_ADDR;
+
+       imap->im_sit.sit_piscr &= ~(PISCR_PIE | PISCR_PTE);
+
+       printk(KERN_NOTICE "mpc8xx_wdt: keep-alive handler deactivated\n");
+}
+
+static void mpc8xx_wdt_handler_enable(void)
+{
+       volatile immap_t *imap = (volatile immap_t *)IMAP_ADDR;
+
+       imap->im_sit.sit_piscr |= PISCR_PIE | PISCR_PTE;
+
+       printk(KERN_NOTICE "mpc8xx_wdt: keep-alive handler activated\n");
+}
+
+static int mpc8xx_wdt_open(struct inode *inode, struct file *file)
+{
+       if (test_and_set_bit(0, &wdt_opened))
+               return -EBUSY;
+
+       m8xx_wdt_reset();
+       mpc8xx_wdt_handler_disable();
+
+       return 0;
+}
+
+static int mpc8xx_wdt_release(struct inode *inode, struct file *file)
+{
+       m8xx_wdt_reset();
+
+#if !defined(CONFIG_WATCHDOG_NOWAYOUT)
+       mpc8xx_wdt_handler_enable();
+#endif
+
+       clear_bit(0, &wdt_opened);
+
+       return 0;
+}
+
+static ssize_t mpc8xx_wdt_write(struct file *file, const char *data, size_t len,
+                               loff_t * ppos)
+{
+       if (ppos != &file->f_pos)
+               return -ESPIPE;
+
+       if (len)
+               m8xx_wdt_reset();
+
+       return len;
+}
+
+static int mpc8xx_wdt_ioctl(struct inode *inode, struct file *file,
+                           unsigned int cmd, unsigned long arg)
+{
+       int timeout;
+       static struct watchdog_info info = {
+               .options = WDIOF_KEEPALIVEPING,
+               .firmware_version = 0,
+               .identity = "MPC8xx watchdog",
+       };
+
+       switch (cmd) {
+       case WDIOC_GETSUPPORT:
+               if (copy_to_user((void *)arg, &info, sizeof(info)))
+                       return -EFAULT;
+               break;
+
+       case WDIOC_GETSTATUS:
+       case WDIOC_GETBOOTSTATUS:
+               if (put_user(wdt_status, (int *)arg))
+                       return -EFAULT;
+               wdt_status &= ~WDIOF_KEEPALIVEPING;
+               break;
+
+       case WDIOC_GETTEMP:
+               return -EOPNOTSUPP;
+
+       case WDIOC_SETOPTIONS:
+               return -EOPNOTSUPP;
+
+       case WDIOC_KEEPALIVE:
+               m8xx_wdt_reset();
+               wdt_status |= WDIOF_KEEPALIVEPING;
+               break;
+
+       case WDIOC_SETTIMEOUT:
+               return -EOPNOTSUPP;
+
+       case WDIOC_GETTIMEOUT:
+               timeout = m8xx_wdt_get_timeout();
+               if (put_user(timeout, (int *)arg))
+                       return -EFAULT;
+               break;
+
+       default:
+               return -ENOIOCTLCMD;
+       }
+
+       return 0;
+}
+
+static struct file_operations mpc8xx_wdt_fops = {
+       .owner = THIS_MODULE,
+       .llseek = no_llseek,
+       .write = mpc8xx_wdt_write,
+       .ioctl = mpc8xx_wdt_ioctl,
+       .open = mpc8xx_wdt_open,
+       .release = mpc8xx_wdt_release,
+};
+
+static struct miscdevice mpc8xx_wdt_miscdev = {
+       .minor = WATCHDOG_MINOR,
+       .name = "watchdog",
+       .fops = &mpc8xx_wdt_fops,
+};
+
+static int __init mpc8xx_wdt_init(void)
+{
+       return misc_register(&mpc8xx_wdt_miscdev);
+}
+
+static void __exit mpc8xx_wdt_exit(void)
+{
+       misc_deregister(&mpc8xx_wdt_miscdev);
+
+       m8xx_wdt_reset();
+       mpc8xx_wdt_handler_enable();
+}
+
+module_init(mpc8xx_wdt_init);
+module_exit(mpc8xx_wdt_exit);
+
+MODULE_AUTHOR("Florian Schirmer <jolt@tuxbox.org>");
+MODULE_DESCRIPTION("MPC8xx watchdog driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);