watchdog: xilinx: Convert driver to the watchdog framework
authorMichal Simek <michal.simek@xilinx.com>
Wed, 12 Feb 2014 13:34:32 +0000 (14:34 +0100)
committerWim Van Sebroeck <wim@iguana.be>
Mon, 31 Mar 2014 11:28:56 +0000 (13:28 +0200)
- Remove uneeded headers, fops functions
- Use xilinx_wdt prefix in start/stop/keepalive functions
  and in new structures

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
drivers/watchdog/Kconfig
drivers/watchdog/of_xilinx_wdt.c

index 79d25894343a0f7d52e8702d05ec4020927d1040..82ffa0fbbfa1a0b349555560db70a2201cffeaeb 100644 (file)
@@ -1026,6 +1026,7 @@ config M54xx_WATCHDOG
 config XILINX_WATCHDOG
        tristate "Xilinx Watchdog timer"
        depends on MICROBLAZE
+       select WATCHDOG_CORE
        ---help---
          Watchdog driver for the xps_timebase_wdt ip core.
 
index 19fa92d01f5d1e40ab93afccac5adcee08b3c229..0e6c188f55ae7c867034217c022ac384ff8e485f 100644 (file)
@@ -1,6 +1,7 @@
 /*
  * Watchdog Device Driver for Xilinx axi/xps_timebase_wdt
  *
+ * (C) Copyright 2013 - 2014 Xilinx, Inc.
  * (C) Copyright 2011 (Alejandro Cabrera <aldaya@gmail.com>)
  *
  * This program is free software; you can redistribute it and/or
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/miscdevice.h>
 #include <linux/ioport.h>
 #include <linux/watchdog.h>
 #include <linux/io.h>
-#include <linux/uaccess.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/of_address.h>
 struct xwdt_device {
        struct resource  res;
        void __iomem *base;
-       u32 nowayout;
        u32 wdt_interval;
-       u32 boot_status;
 };
 
 static struct xwdt_device xdev;
 
 static  u32 timeout;
 static  u32 control_status_reg;
-static  u8  expect_close;
 static  u8  no_timeout;
-static unsigned long driver_open;
 
 static  DEFINE_SPINLOCK(spinlock);
 
-static void xwdt_start(void)
+static int xilinx_wdt_start(struct watchdog_device *wdd)
 {
        spin_lock(&spinlock);
 
@@ -76,9 +70,11 @@ static void xwdt_start(void)
        iowrite32(XWT_CSRX_EWDT2_MASK, xdev.base + XWT_TWCSR1_OFFSET);
 
        spin_unlock(&spinlock);
+
+       return 0;
 }
 
-static void xwdt_stop(void)
+static int xilinx_wdt_stop(struct watchdog_device *wdd)
 {
        spin_lock(&spinlock);
 
@@ -91,9 +87,11 @@ static void xwdt_stop(void)
 
        spin_unlock(&spinlock);
        pr_info("Stopped!\n");
+
+       return 0;
 }
 
-static void xwdt_keepalive(void)
+static int xilinx_wdt_keepalive(struct watchdog_device *wdd)
 {
        spin_lock(&spinlock);
 
@@ -102,23 +100,28 @@ static void xwdt_keepalive(void)
        iowrite32(control_status_reg, xdev.base + XWT_TWCSR0_OFFSET);
 
        spin_unlock(&spinlock);
-}
 
-static void xwdt_get_status(int *status)
-{
-       int new_status;
+       return 0;
+}
 
-       spin_lock(&spinlock);
+static const struct watchdog_info xilinx_wdt_ident = {
+       .options =  WDIOF_MAGICCLOSE |
+                   WDIOF_KEEPALIVEPING,
+       .firmware_version =     1,
+       .identity =     WATCHDOG_NAME,
+};
 
-       control_status_reg = ioread32(xdev.base + XWT_TWCSR0_OFFSET);
-       new_status = ((control_status_reg &
-                       (XWT_CSR0_WRS_MASK | XWT_CSR0_WDS_MASK)) != 0);
-       spin_unlock(&spinlock);
+static const struct watchdog_ops xilinx_wdt_ops = {
+       .owner = THIS_MODULE,
+       .start = xilinx_wdt_start,
+       .stop = xilinx_wdt_stop,
+       .ping = xilinx_wdt_keepalive,
+};
 
-       *status = 0;
-       if (new_status & 1)
-               *status |= WDIOF_CARDRESET;
-}
+static struct watchdog_device xilinx_wdt_wdd = {
+       .info = &xilinx_wdt_ident,
+       .ops = &xilinx_wdt_ops,
+};
 
 static u32 xwdt_selftest(void)
 {
@@ -145,139 +148,6 @@ static u32 xwdt_selftest(void)
                return XWT_TIMER_FAILED;
 }
 
-static int xwdt_open(struct inode *inode, struct file *file)
-{
-       /* Only one process can handle the wdt at a time */
-       if (test_and_set_bit(0, &driver_open))
-               return -EBUSY;
-
-       /* Make sure that the module are always loaded...*/
-       if (xdev.nowayout)
-               __module_get(THIS_MODULE);
-
-       xwdt_start();
-       pr_info("Started...\n");
-
-       return nonseekable_open(inode, file);
-}
-
-static int xwdt_release(struct inode *inode, struct file *file)
-{
-       if (expect_close == 42) {
-               xwdt_stop();
-       } else {
-               pr_crit("Unexpected close, not stopping watchdog!\n");
-               xwdt_keepalive();
-       }
-
-       clear_bit(0, &driver_open);
-       expect_close = 0;
-       return 0;
-}
-
-/*
- *      xwdt_write:
- *      @file: file handle to the watchdog
- *      @buf: buffer to write (unused as data does not matter here
- *      @count: count of bytes
- *      @ppos: pointer to the position to write. No seeks allowed
- *
- *      A write to a watchdog device is defined as a keepalive signal. Any
- *      write of data will do, as we don't define content meaning.
- */
-static ssize_t xwdt_write(struct file *file, const char __user *buf,
-                                               size_t len, loff_t *ppos)
-{
-       if (len) {
-               if (!xdev.nowayout) {
-                       size_t i;
-
-                       /* In case it was set long ago */
-                       expect_close = 0;
-
-                       for (i = 0; i != len; i++) {
-                               char c;
-
-                               if (get_user(c, buf + i))
-                                       return -EFAULT;
-                               if (c == 'V')
-                                       expect_close = 42;
-                       }
-               }
-               xwdt_keepalive();
-       }
-       return len;
-}
-
-static const struct watchdog_info ident = {
-       .options =  WDIOF_MAGICCLOSE |
-                   WDIOF_KEEPALIVEPING,
-       .firmware_version =     1,
-       .identity =     WATCHDOG_NAME,
-};
-
-/*
- *      xwdt_ioctl:
- *      @file: file handle to the device
- *      @cmd: watchdog command
- *      @arg: argument pointer
- *
- *      The watchdog API defines a common set of functions for all watchdogs
- *      according to their available features.
- */
-static long xwdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
-       int status;
-
-       union {
-               struct watchdog_info __user *ident;
-               int __user *i;
-       } uarg;
-
-       uarg.i = (int __user *)arg;
-
-       switch (cmd) {
-       case WDIOC_GETSUPPORT:
-               return copy_to_user(uarg.ident, &ident,
-                                       sizeof(ident)) ? -EFAULT : 0;
-
-       case WDIOC_GETBOOTSTATUS:
-               return put_user(xdev.boot_status, uarg.i);
-
-       case WDIOC_GETSTATUS:
-               xwdt_get_status(&status);
-               return put_user(status, uarg.i);
-
-       case WDIOC_KEEPALIVE:
-               xwdt_keepalive();
-               return 0;
-
-       case WDIOC_GETTIMEOUT:
-               if (no_timeout)
-                       return -ENOTTY;
-               else
-                       return put_user(timeout, uarg.i);
-
-       default:
-               return -ENOTTY;
-       }
-}
-
-static const struct file_operations xwdt_fops = {
-       .owner      = THIS_MODULE,
-       .llseek     = no_llseek,
-       .write      = xwdt_write,
-       .open       = xwdt_open,
-       .release    = xwdt_release,
-       .unlocked_ioctl = xwdt_ioctl,
-};
-
-static struct miscdevice xwdt_miscdev = {
-       .minor      = WATCHDOG_MINOR,
-       .name       = "watchdog",
-       .fops       = &xwdt_fops,
-};
-
 static int xwdt_probe(struct platform_device *pdev)
 {
        int rc;
@@ -313,7 +183,7 @@ static int xwdt_probe(struct platform_device *pdev)
                                        "xlnx,wdt-enable-once", NULL);
        if (tmptr == NULL) {
                pr_warn("Parameter \"xlnx,wdt-enable-once\" not found in device tree!\n");
-               xdev.nowayout = WATCHDOG_NOWAYOUT;
+               watchdog_set_nowayout(&xilinx_wdt_wdd, true);
        }
 
 /*
@@ -343,24 +213,14 @@ static int xwdt_probe(struct platform_device *pdev)
                goto unmap_io;
        }
 
-       xwdt_get_status(&xdev.boot_status);
-
-       rc = misc_register(&xwdt_miscdev);
+       rc = watchdog_register_device(&xilinx_wdt_wdd);
        if (rc) {
-               pr_err("cannot register miscdev on minor=%d (err=%d)\n",
-                      xwdt_miscdev.minor, rc);
+               pr_err("cannot register watchdog (err=%d)\n", rc);
                goto unmap_io;
        }
 
-       if (no_timeout)
-               pr_info("driver loaded (timeout=? sec, nowayout=%d)\n",
-                       xdev.nowayout);
-       else
-               pr_info("driver loaded (timeout=%d sec, nowayout=%d)\n",
-                       timeout, xdev.nowayout);
-
-       expect_close = 0;
-       clear_bit(0, &driver_open);
+       dev_info(&pdev->dev, "Xilinx Watchdog Timer at %p with timeout %ds\n",
+                xdev.base, timeout);
 
        return 0;
 
@@ -374,7 +234,7 @@ err_out:
 
 static int xwdt_remove(struct platform_device *dev)
 {
-       misc_deregister(&xwdt_miscdev);
+       watchdog_unregister_device(&xilinx_wdt_wdd);
        iounmap(xdev.base);
        release_mem_region(xdev.res.start, resource_size(&xdev.res));