Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog
authorLinus Torvalds <torvalds@linux-foundation.org>
Sat, 3 Jan 2009 19:59:13 +0000 (11:59 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 3 Jan 2009 19:59:13 +0000 (11:59 -0800)
* git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog:
  [WATCHDOG] Add support for the WM8350 watchdog
  [WATCHDOG] Add SMSC SCH311x Watchdog Timer.
  [WATCHDOG] ib700wdt - add timeout parameter

drivers/watchdog/Kconfig
drivers/watchdog/Makefile
drivers/watchdog/ib700wdt.c
drivers/watchdog/sch311x_wdt.c [new file with mode: 0644]
drivers/watchdog/wm8350_wdt.c [new file with mode: 0644]

index 4fd3fa5546b12282e5b25e521e5a7d5bb5bb829e..ec68c741b5645eddd206df2a02b492b3ee783650 100644 (file)
@@ -55,6 +55,13 @@ config SOFT_WATCHDOG
          To compile this driver as a module, choose M here: the
          module will be called softdog.
 
+config WM8350_WATCHDOG
+       tristate "WM8350 watchdog"
+       depends on MFD_WM8350
+       help
+         Support for the watchdog in the WM8350 AudioPlus PMIC.  When
+         the watchdog triggers the system will be reset.
+
 # ALPHA Architecture
 
 # ARM Architecture
@@ -551,6 +558,18 @@ config CPU5_WDT
          To compile this driver as a module, choose M here: the
          module will be called cpu5wdt.
 
+config SMSC_SCH311X_WDT
+       tristate "SMSC SCH311X Watchdog Timer"
+       depends on X86
+       ---help---
+         This is the driver for the hardware watchdog timer on the
+         SMSC SCH3112, SCH3114 and SCH3116 Super IO chipset
+         (LPC IO with 8042 KBC, Reset Generation, HWM and multiple
+         serial ports).
+
+         To compile this driver as a module, choose M here: the
+         module will be called sch311x_wdt.
+
 config SMSC37B787_WDT
        tristate "Winbond SMsC37B787 Watchdog Timer"
        depends on X86
index e352bbb7630b405a0ac3dc30a03c88b2eaa4c6b9..c19b866f5ed1d6a8e73cc627f494baadf0468af1 100644 (file)
@@ -83,6 +83,7 @@ obj-$(CONFIG_60XX_WDT) += sbc60xxwdt.o
 obj-$(CONFIG_SBC8360_WDT) += sbc8360.o
 obj-$(CONFIG_SBC7240_WDT) += sbc7240_wdt.o
 obj-$(CONFIG_CPU5_WDT) += cpu5wdt.o
+obj-$(CONFIG_SMSC_SCH311X_WDT) += sch311x_wdt.o
 obj-$(CONFIG_SMSC37B787_WDT) += smsc37b787_wdt.o
 obj-$(CONFIG_W83627HF_WDT) += w83627hf_wdt.o
 obj-$(CONFIG_W83697HF_WDT) += w83697hf_wdt.o
@@ -133,4 +134,5 @@ obj-$(CONFIG_WATCHDOG_CP1XXX)               += cpwd.o
 # XTENSA Architecture
 
 # Architecture Independant
+obj-$(CONFIG_WM8350_WATCHDOG) += wm8350_wdt.o
 obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
index 317ef2b16cffb27830813f273f5f0b6caead5d33..4bef3ddff4a5d8715ffeec1680376135a2c14a60 100644 (file)
@@ -91,32 +91,16 @@ static char expect_close;
  *
  */
 
-static int wd_times[] = {
-       30,     /* 0x0 */
-       28,     /* 0x1 */
-       26,     /* 0x2 */
-       24,     /* 0x3 */
-       22,     /* 0x4 */
-       20,     /* 0x5 */
-       18,     /* 0x6 */
-       16,     /* 0x7 */
-       14,     /* 0x8 */
-       12,     /* 0x9 */
-       10,     /* 0xA */
-       8,      /* 0xB */
-       6,      /* 0xC */
-       4,      /* 0xD */
-       2,      /* 0xE */
-       0,      /* 0xF */
-};
-
 #define WDT_STOP 0x441
 #define WDT_START 0x443
 
 /* Default timeout */
-#define WD_TIMO 0              /* 30 seconds +/- 20%, from table */
-
-static int wd_margin = WD_TIMO;
+#define WATCHDOG_TIMEOUT 30            /* 30 seconds +/- 20% */
+static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout,
+       "Watchdog timeout in seconds. 0<= timeout <=30, default="
+               __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
 
 static int nowayout = WATCHDOG_NOWAYOUT;
 module_param(nowayout, int, 0);
@@ -131,6 +115,8 @@ MODULE_PARM_DESC(nowayout,
 
 static void ibwdt_ping(void)
 {
+       int wd_margin = 15 - ((timeout + 1) / 2);
+
        spin_lock(&ibwdt_lock);
 
        /* Write a watchdog value */
@@ -148,15 +134,10 @@ static void ibwdt_disable(void)
 
 static int ibwdt_set_heartbeat(int t)
 {
-       int i;
-
-       if ((t < 0) || (t > 30))
+       if (t < 0 || t > 30)
                return -EINVAL;
 
-       for (i = 0x0F; i > -1; i--)
-               if (wd_times[i] >= t)
-                       break;
-       wd_margin = i;
+       timeout = t;
        return 0;
 }
 
@@ -240,7 +221,7 @@ static long ibwdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                /* Fall */
 
        case WDIOC_GETTIMEOUT:
-               return put_user(wd_times[wd_margin], p);
+               return put_user(timeout, p);
 
        default:
                return -ENOTTY;
@@ -317,6 +298,14 @@ static int __devinit ibwdt_probe(struct platform_device *dev)
                goto out_nostartreg;
        }
 
+       /* Check that the heartbeat value is within it's range ;
+        * if not reset to the default */
+       if (ibwdt_set_heartbeat(timeout)) {
+               ibwdt_set_heartbeat(WATCHDOG_TIMEOUT);
+               printk(KERN_INFO PFX
+                       "timeout value must be 0<=x<=30, using %d\n", timeout);
+       }
+
        res = misc_register(&ibwdt_miscdev);
        if (res) {
                printk(KERN_ERR PFX "failed to register misc device\n");
diff --git a/drivers/watchdog/sch311x_wdt.c b/drivers/watchdog/sch311x_wdt.c
new file mode 100644 (file)
index 0000000..569eb29
--- /dev/null
@@ -0,0 +1,578 @@
+/*
+ *     sch311x_wdt.c - Driver for the SCH311x Super-I/O chips
+ *                     integrated watchdog.
+ *
+ *     (c) Copyright 2008 Wim Van Sebroeck <wim@iguana.be>.
+ *
+ *     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.
+ *
+ *     Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
+ *     provide warranty for any of this software. This material is
+ *     provided "AS-IS" and at no charge.
+ */
+
+/*
+ *     Includes, defines, variables, module parameters, ...
+ */
+
+/* Includes */
+#include <linux/module.h>              /* For module specific items */
+#include <linux/moduleparam.h>         /* For new moduleparam's */
+#include <linux/types.h>               /* For standard types (like size_t) */
+#include <linux/errno.h>               /* For the -ENODEV/... values */
+#include <linux/kernel.h>              /* For printk/... */
+#include <linux/miscdevice.h>          /* For MODULE_ALIAS_MISCDEV
+                                                       (WATCHDOG_MINOR) */
+#include <linux/watchdog.h>            /* For the watchdog specific items */
+#include <linux/init.h>                        /* For __init/__exit/... */
+#include <linux/fs.h>                  /* For file operations */
+#include <linux/platform_device.h>     /* For platform_driver framework */
+#include <linux/ioport.h>              /* For io-port access */
+#include <linux/spinlock.h>            /* For spin_lock/spin_unlock/... */
+#include <linux/uaccess.h>             /* For copy_to_user/put_user/... */
+#include <linux/io.h>                  /* For inb/outb/... */
+
+/* Module and version information */
+#define DRV_NAME       "sch311x_wdt"
+#define PFX            DRV_NAME ": "
+
+/* Runtime registers */
+#define RESGEN                 0x1d
+#define GP60                   0x47
+#define WDT_TIME_OUT           0x65
+#define WDT_VAL                        0x66
+#define WDT_CFG                        0x67
+#define WDT_CTRL               0x68
+
+/* internal variables */
+static unsigned long sch311x_wdt_is_open;
+static char sch311x_wdt_expect_close;
+static struct platform_device *sch311x_wdt_pdev;
+
+static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e, 0x00 };
+
+static struct {        /* The devices private data */
+       /* the Runtime Register base address */
+       unsigned short runtime_reg;
+       /* The card's boot status */
+       int boot_status;
+       /* the lock for io operations */
+       spinlock_t io_lock;
+} sch311x_wdt_data;
+
+/* Module load parameters */
+static unsigned short force_id;
+module_param(force_id, ushort, 0);
+MODULE_PARM_DESC(force_id, "Override the detected device ID");
+
+static unsigned short therm_trip;
+module_param(therm_trip, ushort, 0);
+MODULE_PARM_DESC(therm_trip, "Should a ThermTrip trigger the reset generator");
+
+#define WATCHDOG_TIMEOUT 60            /* 60 sec default timeout */
+static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout,
+       "Watchdog timeout in seconds. 1<= timeout <=15300, default="
+               __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout,
+       "Watchdog cannot be stopped once started (default="
+               __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+/*
+ *     Super-IO functions
+ */
+
+static inline void sch311x_sio_enter(int sio_config_port)
+{
+       outb(0x55, sio_config_port);
+}
+
+static inline void sch311x_sio_exit(int sio_config_port)
+{
+       outb(0xaa, sio_config_port);
+}
+
+static inline int sch311x_sio_inb(int sio_config_port, int reg)
+{
+       outb(reg, sio_config_port);
+       return inb(sio_config_port + 1);
+}
+
+static inline void sch311x_sio_outb(int sio_config_port, int reg, int val)
+{
+       outb(reg, sio_config_port);
+       outb(val, sio_config_port + 1);
+}
+
+/*
+ *     Watchdog Operations
+ */
+
+static void sch311x_wdt_set_timeout(int t)
+{
+       unsigned char timeout_unit = 0x80;
+
+       /* When new timeout is bigger then 255 seconds, we will use minutes */
+       if (t > 255) {
+               timeout_unit = 0;
+               t /= 60;
+       }
+
+       /* -- Watchdog Timeout --
+        * Bit 0-6 (Reserved)
+        * Bit 7   WDT Time-out Value Units Select
+        *         (0 = Minutes, 1 = Seconds)
+        */
+       outb(timeout_unit, sch311x_wdt_data.runtime_reg + WDT_TIME_OUT);
+
+       /* -- Watchdog Timer Time-out Value --
+        * Bit 0-7 Binary coded units (0=Disabled, 1..255)
+        */
+       outb(t, sch311x_wdt_data.runtime_reg + WDT_VAL);
+}
+
+static void sch311x_wdt_start(void)
+{
+       spin_lock(&sch311x_wdt_data.io_lock);
+
+       /* set watchdog's timeout */
+       sch311x_wdt_set_timeout(timeout);
+       /* enable the watchdog */
+       /* -- General Purpose I/O Bit 6.0 --
+        * Bit 0,   In/Out: 0 = Output, 1 = Input
+        * Bit 1,   Polarity: 0 = No Invert, 1 = Invert
+        * Bit 2-3, Function select: 00 = GPI/O, 01 = LED1, 11 = WDT,
+        *                           10 = Either Edge Triggered Intr.4
+        * Bit 4-6  (Reserved)
+        * Bit 7,   Output Type: 0 = Push Pull Bit, 1 = Open Drain
+        */
+       outb(0x0e, sch311x_wdt_data.runtime_reg + GP60);
+
+       spin_unlock(&sch311x_wdt_data.io_lock);
+
+}
+
+static void sch311x_wdt_stop(void)
+{
+       spin_lock(&sch311x_wdt_data.io_lock);
+
+       /* stop the watchdog */
+       outb(0x01, sch311x_wdt_data.runtime_reg + GP60);
+       /* disable timeout by setting it to 0 */
+       sch311x_wdt_set_timeout(0);
+
+       spin_unlock(&sch311x_wdt_data.io_lock);
+}
+
+static void sch311x_wdt_keepalive(void)
+{
+       spin_lock(&sch311x_wdt_data.io_lock);
+       sch311x_wdt_set_timeout(timeout);
+       spin_unlock(&sch311x_wdt_data.io_lock);
+}
+
+static int sch311x_wdt_set_heartbeat(int t)
+{
+       if (t < 1 || t > (255*60))
+               return -EINVAL;
+
+       /* When new timeout is bigger then 255 seconds,
+        * we will round up to minutes (with a max of 255) */
+       if (t > 255)
+               t = (((t - 1) / 60) + 1) * 60;
+
+       timeout = t;
+       return 0;
+}
+
+static void sch311x_wdt_get_status(int *status)
+{
+       unsigned char new_status;
+
+       *status = 0;
+
+       spin_lock(&sch311x_wdt_data.io_lock);
+
+       /* -- Watchdog timer control --
+        * Bit 0   Status Bit: 0 = Timer counting, 1 = Timeout occured
+        * Bit 1   Reserved
+        * Bit 2   Force Timeout: 1 = Forces WD timeout event (self-cleaning)
+        * Bit 3   P20 Force Timeout enabled:
+        *          0 = P20 activity does not generate the WD timeout event
+        *          1 = P20 Allows rising edge of P20, from the keyboard
+        *              controller, to force the WD timeout event.
+        * Bit 4-7 Reserved
+        */
+       new_status = inb(sch311x_wdt_data.runtime_reg + WDT_CTRL);
+       if (new_status & 0x01)
+               *status |= WDIOF_CARDRESET;
+
+       spin_unlock(&sch311x_wdt_data.io_lock);
+}
+
+/*
+ *     /dev/watchdog handling
+ */
+
+static ssize_t sch311x_wdt_write(struct file *file, const char __user *buf,
+                                               size_t count, loff_t *ppos)
+{
+       if (count) {
+               if (!nowayout) {
+                       size_t i;
+
+                       sch311x_wdt_expect_close = 0;
+
+                       for (i = 0; i != count; i++) {
+                               char c;
+                               if (get_user(c, buf + i))
+                                       return -EFAULT;
+                               if (c == 'V')
+                                       sch311x_wdt_expect_close = 42;
+                       }
+               }
+               sch311x_wdt_keepalive();
+       }
+       return count;
+}
+
+static long sch311x_wdt_ioctl(struct file *file, unsigned int cmd,
+                                                       unsigned long arg)
+{
+       int status;
+       int new_timeout;
+       void __user *argp = (void __user *)arg;
+       int __user *p = argp;
+       static struct watchdog_info ident = {
+               .options                = WDIOF_KEEPALIVEPING |
+                                         WDIOF_SETTIMEOUT |
+                                         WDIOF_MAGICCLOSE,
+               .firmware_version       = 1,
+               .identity               = DRV_NAME,
+       };
+
+       switch (cmd) {
+       case WDIOC_GETSUPPORT:
+               if (copy_to_user(argp, &ident, sizeof(ident)))
+                       return -EFAULT;
+               break;
+
+       case WDIOC_GETSTATUS:
+       {
+               sch311x_wdt_get_status(&status);
+               return put_user(status, p);
+       }
+       case WDIOC_GETBOOTSTATUS:
+               return put_user(sch311x_wdt_data.boot_status, p);
+
+       case WDIOC_SETOPTIONS:
+       {
+               int options, retval = -EINVAL;
+
+               if (get_user(options, p))
+                       return -EFAULT;
+               if (options & WDIOS_DISABLECARD) {
+                       sch311x_wdt_stop();
+                       retval = 0;
+               }
+               if (options & WDIOS_ENABLECARD) {
+                       sch311x_wdt_start();
+                       retval = 0;
+               }
+               return retval;
+       }
+       case WDIOC_KEEPALIVE:
+               sch311x_wdt_keepalive();
+               break;
+
+       case WDIOC_SETTIMEOUT:
+               if (get_user(new_timeout, p))
+                       return -EFAULT;
+               if (sch311x_wdt_set_heartbeat(new_timeout))
+                       return -EINVAL;
+               sch311x_wdt_keepalive();
+               /* Fall */
+       case WDIOC_GETTIMEOUT:
+               return put_user(timeout, p);
+       default:
+               return -ENOTTY;
+       }
+       return 0;
+}
+
+static int sch311x_wdt_open(struct inode *inode, struct file *file)
+{
+       if (test_and_set_bit(0, &sch311x_wdt_is_open))
+               return -EBUSY;
+       /*
+        *      Activate
+        */
+       sch311x_wdt_start();
+       return nonseekable_open(inode, file);
+}
+
+static int sch311x_wdt_close(struct inode *inode, struct file *file)
+{
+       if (sch311x_wdt_expect_close == 42) {
+               sch311x_wdt_stop();
+       } else {
+               printk(KERN_CRIT PFX
+                               "Unexpected close, not stopping watchdog!\n");
+               sch311x_wdt_keepalive();
+       }
+       clear_bit(0, &sch311x_wdt_is_open);
+       sch311x_wdt_expect_close = 0;
+       return 0;
+}
+
+/*
+ *     Kernel Interfaces
+ */
+
+static const struct file_operations sch311x_wdt_fops = {
+       .owner          = THIS_MODULE,
+       .llseek         = no_llseek,
+       .write          = sch311x_wdt_write,
+       .unlocked_ioctl = sch311x_wdt_ioctl,
+       .open           = sch311x_wdt_open,
+       .release        = sch311x_wdt_close,
+};
+
+static struct miscdevice sch311x_wdt_miscdev = {
+       .minor  = WATCHDOG_MINOR,
+       .name   = "watchdog",
+       .fops   = &sch311x_wdt_fops,
+};
+
+/*
+ *     Init & exit routines
+ */
+
+static int __devinit sch311x_wdt_probe(struct platform_device *pdev)
+{
+       struct device *dev = &pdev->dev;
+       unsigned char val;
+       int err;
+
+       spin_lock_init(&sch311x_wdt_data.io_lock);
+
+       if (!request_region(sch311x_wdt_data.runtime_reg + RESGEN, 1,
+                                                               DRV_NAME)) {
+               dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
+                       sch311x_wdt_data.runtime_reg + RESGEN,
+                       sch311x_wdt_data.runtime_reg + RESGEN);
+               err = -EBUSY;
+               goto exit;
+       }
+
+       if (!request_region(sch311x_wdt_data.runtime_reg + GP60, 1, DRV_NAME)) {
+               dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
+                       sch311x_wdt_data.runtime_reg + GP60,
+                       sch311x_wdt_data.runtime_reg + GP60);
+               err = -EBUSY;
+               goto exit_release_region;
+       }
+
+       if (!request_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4,
+                                                               DRV_NAME)) {
+               dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
+                       sch311x_wdt_data.runtime_reg + WDT_TIME_OUT,
+                       sch311x_wdt_data.runtime_reg + WDT_CTRL);
+               err = -EBUSY;
+               goto exit_release_region2;
+       }
+
+       /* Make sure that the watchdog is not running */
+       sch311x_wdt_stop();
+
+       /* Disable keyboard and mouse interaction and interrupt */
+       /* -- Watchdog timer configuration --
+        * Bit 0   Reserved
+        * Bit 1   Keyboard enable: 0* = No Reset, 1 = Reset WDT upon KBD Intr.
+        * Bit 2   Mouse enable: 0* = No Reset, 1 = Reset WDT upon Mouse Intr
+        * Bit 3   Reserved
+        * Bit 4-7 WDT Interrupt Mapping: (0000* = Disabled,
+        *            0001=IRQ1, 0010=(Invalid), 0011=IRQ3 to 1111=IRQ15)
+        */
+       outb(0, sch311x_wdt_data.runtime_reg + WDT_CFG);
+
+       /* Check that the heartbeat value is within it's range ;
+        * if not reset to the default */
+       if (sch311x_wdt_set_heartbeat(timeout)) {
+               sch311x_wdt_set_heartbeat(WATCHDOG_TIMEOUT);
+               dev_info(dev, "timeout value must be 1<=x<=15300, using %d\n",
+                       timeout);
+       }
+
+       /* Get status at boot */
+       sch311x_wdt_get_status(&sch311x_wdt_data.boot_status);
+
+       /* enable watchdog */
+       /* -- Reset Generator --
+        * Bit 0   Enable Watchdog Timer Generation: 0* = Enabled, 1 = Disabled
+        * Bit 1   Thermtrip Source Select: O* = No Source, 1 = Source
+        * Bit 2   WDT2_CTL: WDT input bit
+        * Bit 3-7 Reserved
+        */
+       outb(0, sch311x_wdt_data.runtime_reg + RESGEN);
+       val = therm_trip ? 0x06 : 0x04;
+       outb(val, sch311x_wdt_data.runtime_reg + RESGEN);
+
+       err = misc_register(&sch311x_wdt_miscdev);
+       if (err != 0) {
+               dev_err(dev, "cannot register miscdev on minor=%d (err=%d)\n",
+                                                       WATCHDOG_MINOR, err);
+               goto exit_release_region3;
+       }
+
+       sch311x_wdt_miscdev.parent = dev;
+
+       dev_info(dev,
+               "SMSC SCH311x WDT initialized. timeout=%d sec (nowayout=%d)\n",
+               timeout, nowayout);
+
+       return 0;
+
+exit_release_region3:
+       release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4);
+exit_release_region2:
+       release_region(sch311x_wdt_data.runtime_reg + GP60, 1);
+exit_release_region:
+       release_region(sch311x_wdt_data.runtime_reg + RESGEN, 1);
+       sch311x_wdt_data.runtime_reg = 0;
+exit:
+       return err;
+}
+
+static int __devexit sch311x_wdt_remove(struct platform_device *pdev)
+{
+       /* Stop the timer before we leave */
+       if (!nowayout)
+               sch311x_wdt_stop();
+
+       /* Deregister */
+       misc_deregister(&sch311x_wdt_miscdev);
+       release_region(sch311x_wdt_data.runtime_reg + WDT_TIME_OUT, 4);
+       release_region(sch311x_wdt_data.runtime_reg + GP60, 1);
+       release_region(sch311x_wdt_data.runtime_reg + RESGEN, 1);
+       sch311x_wdt_data.runtime_reg = 0;
+       return 0;
+}
+
+static void sch311x_wdt_shutdown(struct platform_device *dev)
+{
+       /* Turn the WDT off if we have a soft shutdown */
+       sch311x_wdt_stop();
+}
+
+#define sch311x_wdt_suspend NULL
+#define sch311x_wdt_resume  NULL
+
+static struct platform_driver sch311x_wdt_driver = {
+       .probe          = sch311x_wdt_probe,
+       .remove         = __devexit_p(sch311x_wdt_remove),
+       .shutdown       = sch311x_wdt_shutdown,
+       .suspend        = sch311x_wdt_suspend,
+       .resume         = sch311x_wdt_resume,
+       .driver         = {
+               .owner = THIS_MODULE,
+               .name = DRV_NAME,
+       },
+};
+
+static int __init sch311x_detect(int sio_config_port, unsigned short *addr)
+{
+       int err = 0, reg;
+       unsigned short base_addr;
+       unsigned char dev_id;
+
+       sch311x_sio_enter(sio_config_port);
+
+       /* Check device ID. We currently know about:
+        * SCH3112 (0x7c), SCH3114 (0x7d), and SCH3116 (0x7f). */
+       reg = force_id ? force_id : sch311x_sio_inb(sio_config_port, 0x20);
+       if (!(reg == 0x7c || reg == 0x7d || reg == 0x7f)) {
+               err = -ENODEV;
+               goto exit;
+       }
+       dev_id = reg == 0x7c ? 2 : reg == 0x7d ? 4 : 6;
+
+       /* Select logical device A (runtime registers) */
+       sch311x_sio_outb(sio_config_port, 0x07, 0x0a);
+
+       /* Check if Logical Device Register is currently active */
+       if (sch311x_sio_inb(sio_config_port, 0x30) && 0x01 == 0)
+               printk(KERN_INFO PFX "Seems that LDN 0x0a is not active...\n");
+
+       /* Get the base address of the runtime registers */
+       base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) |
+                          sch311x_sio_inb(sio_config_port, 0x61);
+       if (!base_addr) {
+               printk(KERN_ERR PFX "Base address not set.\n");
+               err = -ENODEV;
+               goto exit;
+       }
+       *addr = base_addr;
+
+       printk(KERN_INFO PFX "Found an SMSC SCH311%d chip at 0x%04x\n",
+               dev_id, base_addr);
+
+exit:
+       sch311x_sio_exit(sio_config_port);
+       return err;
+}
+
+static int __init sch311x_wdt_init(void)
+{
+       int err, i, found = 0;
+       unsigned short addr = 0;
+
+       for (i = 0; !found && sch311x_ioports[i]; i++)
+               if (sch311x_detect(sch311x_ioports[i], &addr) == 0)
+                       found++;
+
+       if (!found)
+               return -ENODEV;
+
+       sch311x_wdt_data.runtime_reg = addr;
+
+       err = platform_driver_register(&sch311x_wdt_driver);
+       if (err)
+               return err;
+
+       sch311x_wdt_pdev = platform_device_register_simple(DRV_NAME, addr,
+                                                               NULL, 0);
+
+       if (IS_ERR(sch311x_wdt_pdev)) {
+               err = PTR_ERR(sch311x_wdt_pdev);
+               goto unreg_platform_driver;
+       }
+
+       return 0;
+
+unreg_platform_driver:
+       platform_driver_unregister(&sch311x_wdt_driver);
+       return err;
+}
+
+static void __exit sch311x_wdt_exit(void)
+{
+       platform_device_unregister(sch311x_wdt_pdev);
+       platform_driver_unregister(&sch311x_wdt_driver);
+}
+
+module_init(sch311x_wdt_init);
+module_exit(sch311x_wdt_exit);
+
+MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
+MODULE_DESCRIPTION("SMSC SCH311x WatchDog Timer Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+
diff --git a/drivers/watchdog/wm8350_wdt.c b/drivers/watchdog/wm8350_wdt.c
new file mode 100644 (file)
index 0000000..2bc0d4d
--- /dev/null
@@ -0,0 +1,329 @@
+/*
+ * Watchdog driver for the wm8350
+ *
+ * Copyright (C) 2007, 2008 Wolfson Microelectronics <linux@wolfsonmicro.com>
+ *
+ * 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
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/platform_device.h>
+#include <linux/watchdog.h>
+#include <linux/uaccess.h>
+#include <linux/mfd/wm8350/core.h>
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout,
+                "Watchdog cannot be stopped once started (default="
+                __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+static unsigned long wm8350_wdt_users;
+static struct miscdevice wm8350_wdt_miscdev;
+static int wm8350_wdt_expect_close;
+static DEFINE_MUTEX(wdt_mutex);
+
+static struct {
+       int time;  /* Seconds */
+       u16 val;   /* To be set in WM8350_SYSTEM_CONTROL_2 */
+} wm8350_wdt_cfgs[] = {
+       { 1, 0x02 },
+       { 2, 0x04 },
+       { 4, 0x05 },
+};
+
+static struct wm8350 *get_wm8350(void)
+{
+       return dev_get_drvdata(wm8350_wdt_miscdev.parent);
+}
+
+static int wm8350_wdt_set_timeout(struct wm8350 *wm8350, u16 value)
+{
+       int ret;
+       u16 reg;
+
+       mutex_lock(&wdt_mutex);
+       wm8350_reg_unlock(wm8350);
+
+       reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);
+       reg &= ~WM8350_WDOG_TO_MASK;
+       reg |= value;
+       ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg);
+
+       wm8350_reg_lock(wm8350);
+       mutex_unlock(&wdt_mutex);
+
+       return ret;
+}
+
+static int wm8350_wdt_start(struct wm8350 *wm8350)
+{
+       int ret;
+       u16 reg;
+
+       mutex_lock(&wdt_mutex);
+       wm8350_reg_unlock(wm8350);
+
+       reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);
+       reg &= ~WM8350_WDOG_MODE_MASK;
+       reg |= 0x20;
+       ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg);
+
+       wm8350_reg_lock(wm8350);
+       mutex_unlock(&wdt_mutex);
+
+       return ret;
+}
+
+static int wm8350_wdt_stop(struct wm8350 *wm8350)
+{
+       int ret;
+       u16 reg;
+
+       mutex_lock(&wdt_mutex);
+       wm8350_reg_unlock(wm8350);
+
+       reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);
+       reg &= ~WM8350_WDOG_MODE_MASK;
+       ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg);
+
+       wm8350_reg_lock(wm8350);
+       mutex_unlock(&wdt_mutex);
+
+       return ret;
+}
+
+static int wm8350_wdt_kick(struct wm8350 *wm8350)
+{
+       int ret;
+       u16 reg;
+
+       mutex_lock(&wdt_mutex);
+
+       reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);
+       ret = wm8350_reg_write(wm8350, WM8350_SYSTEM_CONTROL_2, reg);
+
+       mutex_unlock(&wdt_mutex);
+
+       return ret;
+}
+
+static int wm8350_wdt_open(struct inode *inode, struct file *file)
+{
+       struct wm8350 *wm8350 = get_wm8350();
+       int ret;
+
+       if (!wm8350)
+               return -ENODEV;
+
+       if (test_and_set_bit(0, &wm8350_wdt_users))
+               return -EBUSY;
+
+       ret = wm8350_wdt_start(wm8350);
+       if (ret != 0)
+               return ret;
+
+       return nonseekable_open(inode, file);
+}
+
+static int wm8350_wdt_release(struct inode *inode, struct file *file)
+{
+       struct wm8350 *wm8350 = get_wm8350();
+
+       if (wm8350_wdt_expect_close)
+               wm8350_wdt_stop(wm8350);
+       else {
+               dev_warn(wm8350->dev, "Watchdog device closed uncleanly\n");
+               wm8350_wdt_kick(wm8350);
+       }
+
+       clear_bit(0, &wm8350_wdt_users);
+
+       return 0;
+}
+
+static ssize_t wm8350_wdt_write(struct file *file,
+                               const char __user *data, size_t count,
+                               loff_t *ppos)
+{
+       struct wm8350 *wm8350 = get_wm8350();
+       size_t i;
+
+       if (count) {
+               wm8350_wdt_kick(wm8350);
+
+               if (!nowayout) {
+                       /* In case it was set long ago */
+                       wm8350_wdt_expect_close = 0;
+
+                       /* scan to see whether or not we got the magic
+                          character */
+                       for (i = 0; i != count; i++) {
+                               char c;
+                               if (get_user(c, data + i))
+                                       return -EFAULT;
+                               if (c == 'V')
+                                       wm8350_wdt_expect_close = 42;
+                       }
+               }
+       }
+       return count;
+}
+
+static struct watchdog_info ident = {
+       .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+       .identity = "WM8350 Watchdog",
+};
+
+static long wm8350_wdt_ioctl(struct file *file, unsigned int cmd,
+                            unsigned long arg)
+{
+       struct wm8350 *wm8350 = get_wm8350();
+       int ret = -ENOTTY, time, i;
+       void __user *argp = (void __user *)arg;
+       int __user *p = argp;
+       u16 reg;
+
+       switch (cmd) {
+       case WDIOC_GETSUPPORT:
+               ret = copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
+               break;
+
+       case WDIOC_GETSTATUS:
+       case WDIOC_GETBOOTSTATUS:
+               ret = put_user(0, p);
+               break;
+
+       case WDIOC_SETOPTIONS:
+       {
+               int options;
+
+               if (get_user(options, p))
+                       return -EFAULT;
+
+               ret = -EINVAL;
+
+               /* Setting both simultaneously means at least one must fail */
+               if (options == WDIOS_DISABLECARD)
+                       ret = wm8350_wdt_start(wm8350);
+
+               if (options == WDIOS_ENABLECARD)
+                       ret = wm8350_wdt_stop(wm8350);
+               break;
+       }
+
+       case WDIOC_KEEPALIVE:
+               ret = wm8350_wdt_kick(wm8350);
+               break;
+
+       case WDIOC_SETTIMEOUT:
+               ret = get_user(time, p);
+               if (ret)
+                       break;
+
+               if (time == 0) {
+                       if (nowayout)
+                               ret = -EINVAL;
+                       else
+                               wm8350_wdt_stop(wm8350);
+                       break;
+               }
+
+               for (i = 0; i < ARRAY_SIZE(wm8350_wdt_cfgs); i++)
+                       if (wm8350_wdt_cfgs[i].time == time)
+                               break;
+               if (i == ARRAY_SIZE(wm8350_wdt_cfgs))
+                       ret = -EINVAL;
+               else
+                       ret = wm8350_wdt_set_timeout(wm8350,
+                                                    wm8350_wdt_cfgs[i].val);
+               break;
+
+       case WDIOC_GETTIMEOUT:
+               reg = wm8350_reg_read(wm8350, WM8350_SYSTEM_CONTROL_2);
+               reg &= WM8350_WDOG_TO_MASK;
+               for (i = 0; i < ARRAY_SIZE(wm8350_wdt_cfgs); i++)
+                       if (wm8350_wdt_cfgs[i].val == reg)
+                               break;
+               if (i == ARRAY_SIZE(wm8350_wdt_cfgs)) {
+                       dev_warn(wm8350->dev,
+                                "Unknown watchdog configuration: %x\n", reg);
+                       ret = -EINVAL;
+               } else
+                       ret = put_user(wm8350_wdt_cfgs[i].time, p);
+
+       }
+
+       return ret;
+}
+
+static const struct file_operations wm8350_wdt_fops = {
+       .owner = THIS_MODULE,
+       .llseek = no_llseek,
+       .write = wm8350_wdt_write,
+       .unlocked_ioctl = wm8350_wdt_ioctl,
+       .open = wm8350_wdt_open,
+       .release = wm8350_wdt_release,
+};
+
+static struct miscdevice wm8350_wdt_miscdev = {
+       .minor = WATCHDOG_MINOR,
+       .name = "watchdog",
+       .fops = &wm8350_wdt_fops,
+};
+
+static int wm8350_wdt_probe(struct platform_device *pdev)
+{
+       struct wm8350 *wm8350 = platform_get_drvdata(pdev);
+
+       if (!wm8350) {
+               dev_err(wm8350->dev, "No driver data supplied\n");
+               return -ENODEV;
+       }
+
+       /* Default to 4s timeout */
+       wm8350_wdt_set_timeout(wm8350, 0x05);
+
+       wm8350_wdt_miscdev.parent = &pdev->dev;
+
+       return misc_register(&wm8350_wdt_miscdev);
+}
+
+static int __exit wm8350_wdt_remove(struct platform_device *pdev)
+{
+       misc_deregister(&wm8350_wdt_miscdev);
+
+       return 0;
+}
+
+static struct platform_driver wm8350_wdt_driver = {
+       .probe = wm8350_wdt_probe,
+       .remove = wm8350_wdt_remove,
+       .driver = {
+               .name = "wm8350-wdt",
+       },
+};
+
+static int __init wm8350_wdt_init(void)
+{
+       return platform_driver_register(&wm8350_wdt_driver);
+}
+module_init(wm8350_wdt_init);
+
+static void __exit wm8350_wdt_exit(void)
+{
+       platform_driver_unregister(&wm8350_wdt_driver);
+}
+module_exit(wm8350_wdt_exit);
+
+MODULE_AUTHOR("Mark Brown");
+MODULE_DESCRIPTION("WM8350 Watchdog");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm8350-wdt");