1 files changed, 635 insertions, 0 deletions

diff --git a/drivers/char/watchdog/pc87413_wdt.c b/drivers/char/watchdog/pc87413_wdt.c
new file mode 100644
index 000000000000..1d447e32af41
--- /dev/null
+++ b/drivers/char/watchdog/pc87413_wdt.c
@@ -0,0 +1,635 @@
+/*
+ *      NS pc87413-wdt Watchdog Timer driver for Linux 2.6.x.x
+ *
+ *      This code is based on wdt.c with original copyright.
+ *
+ *      (C) Copyright 2006 Sven Anders, <anders@anduras.de>
+ *                     and Marcus Junker, <junker@anduras.de>
+ *
+ *      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 Sven Anders, Marcus Junker nor ANDURAS AG
+ *      admit liability nor provide warranty for any of this software.
+ *      This material is provided "AS-IS" and at no charge.
+ *
+ *      Release 1.1
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/notifier.h>
+#include <linux/fs.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/moduleparam.h>
+#include <linux/version.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+/* #define DEBUG 1 */
+
+#define DEFAULT_TIMEOUT     1            /* 1 minute */
+#define MAX_TIMEOUT         255
+
+#define VERSION             "1.1"
+#define MODNAME             "pc87413 WDT"
+#define PFX                 MODNAME ": "
+#define DPFX                MODNAME " - DEBUG: "
+
+#define WDT_INDEX_IO_PORT   (io+0)       /* I/O port base (index register) */
+#define WDT_DATA_IO_PORT    (WDT_INDEX_IO_PORT+1)
+#define SWC_LDN             0x04
+#define SIOCFG2             0x22         /* Serial IO register */
+#define WDCTL               0x10         /* Watchdog-Timer-Controll-Register */
+#define WDTO                0x11         /* Watchdog timeout register */
+#define WDCFG               0x12         /* Watchdog config register */
+
+static int io = 0x2E;                    /* Address used on Portwell Boards */
+
+static int timeout = DEFAULT_TIMEOUT;    /* timeout value */
+static unsigned long timer_enabled = 0;  /* is the timer enabled? */
+
+static char expect_close;                /* is the close expected? */
+
+static spinlock_t io_lock;               /* to guard the watchdog from io races */
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+
+/* -- Low level function ----------------------------------------*/
+
+/* Select pins for Watchdog output */
+
+static inline void pc87413_select_wdt_out (void)
+{
+        unsigned int cr_data = 0;
+
+        /* Step 1: Select multiple pin,pin55,as WDT output */
+
+        outb_p(SIOCFG2, WDT_INDEX_IO_PORT);
+
+        cr_data = inb (WDT_DATA_IO_PORT);
+
+        cr_data |= 0x80; /* Set Bit7 to 1*/
+        outb_p(SIOCFG2, WDT_INDEX_IO_PORT);
+
+        outb_p(cr_data, WDT_DATA_IO_PORT);
+
+#ifdef DEBUG
+        printk(KERN_INFO DPFX "Select multiple pin,pin55,as WDT output:"
+                              " Bit7 to 1: %d\n", cr_data);
+#endif
+}
+
+/* Enable SWC functions */
+
+static inline void pc87413_enable_swc(void)
+{
+        unsigned int cr_data=0;
+
+        /* Step 2: Enable SWC functions */
+
+        outb_p(0x07, WDT_INDEX_IO_PORT);        /* Point SWC_LDN (LDN=4) */
+        outb_p(SWC_LDN, WDT_DATA_IO_PORT);
+
+        outb_p(0x30, WDT_INDEX_IO_PORT);        /* Read Index 0x30 First */
+        cr_data = inb(WDT_DATA_IO_PORT);
+        cr_data |= 0x01;                        /* Set Bit0 to 1 */
+        outb_p(0x30, WDT_INDEX_IO_PORT);
+        outb_p(cr_data, WDT_DATA_IO_PORT);      /* Index0x30_bit0P1 */
+
+#ifdef DEBUG
+        printk(KERN_INFO DPFX "pc87413 - Enable SWC functions\n");
+#endif
+}
+
+/* Read SWC I/O base address */
+
+static inline unsigned int pc87413_get_swc_base(void)
+{
+        unsigned int  swc_base_addr = 0;
+        unsigned char addr_l, addr_h = 0;
+
+        /* Step 3: Read SWC I/O Base Address */
+
+        outb_p(0x60, WDT_INDEX_IO_PORT);        /* Read Index 0x60 */
+        addr_h = inb(WDT_DATA_IO_PORT);
+
+        outb_p(0x61, WDT_INDEX_IO_PORT);        /* Read Index 0x61 */
+
+        addr_l = inb(WDT_DATA_IO_PORT);
+
+        swc_base_addr = (addr_h << 8) + addr_l;
+
+#ifdef DEBUG
+        printk(KERN_INFO DPFX "Read SWC I/O Base Address: low %d, high %d,"
+                              " res %d\n", addr_l, addr_h, swc_base_addr);
+#endif
+
+        return swc_base_addr;
+}
+
+/* Select Bank 3 of SWC */
+
+static inline void pc87413_swc_bank3(unsigned int swc_base_addr)
+{
+        /* Step 4: Select Bank3 of SWC */
+
+        outb_p(inb(swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f);
+
+#ifdef DEBUG
+        printk(KERN_INFO DPFX "Select Bank3 of SWC\n");
+#endif
+}
+
+/* Set watchdog timeout to x minutes */
+
+static inline void pc87413_programm_wdto(unsigned int swc_base_addr,
+                                         char pc87413_time)
+{
+        /* Step 5: Programm WDTO, Twd. */
+
+        outb_p(pc87413_time, swc_base_addr + WDTO);
+
+#ifdef DEBUG
+        printk(KERN_INFO DPFX "Set WDTO to %d minutes\n", pc87413_time);
+#endif
+}
+
+/* Enable WDEN */
+
+static inline void pc87413_enable_wden(unsigned int swc_base_addr)
+{
+        /* Step 6: Enable WDEN */
+
+        outb_p(inb (swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL);
+
+#ifdef DEBUG
+        printk(KERN_INFO DPFX "Enable WDEN\n");
+#endif
+}
+
+/* Enable SW_WD_TREN */
+static inline void pc87413_enable_sw_wd_tren(unsigned int swc_base_addr)
+{
+        /* Enable SW_WD_TREN */
+
+        outb_p(inb (swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG);
+
+#ifdef DEBUG
+        printk(KERN_INFO DPFX "Enable SW_WD_TREN\n");
+#endif
+}
+
+/* Disable SW_WD_TREN */
+
+static inline void pc87413_disable_sw_wd_tren(unsigned int swc_base_addr)
+{
+        /* Disable SW_WD_TREN */
+
+        outb_p(inb (swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG);
+
+#ifdef DEBUG
+        printk(KERN_INFO DPFX "pc87413 - Disable SW_WD_TREN\n");
+#endif
+}
+
+/* Enable SW_WD_TRG */
+
+static inline void pc87413_enable_sw_wd_trg(unsigned int swc_base_addr)
+{
+        /* Enable SW_WD_TRG */
+
+        outb_p(inb (swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL);
+
+#ifdef DEBUG
+        printk(KERN_INFO DPFX "pc87413 - Enable SW_WD_TRG\n");
+#endif
+}
+
+/* Disable SW_WD_TRG */
+
+static inline void pc87413_disable_sw_wd_trg(unsigned int swc_base_addr)
+{
+        /* Disable SW_WD_TRG */
+
+        outb_p(inb (swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL);
+
+#ifdef DEBUG
+        printk(KERN_INFO DPFX "Disable SW_WD_TRG\n");
+#endif
+}
+
+/* -- Higher level functions ------------------------------------*/
+
+/* Enable the watchdog */
+
+static void pc87413_enable(void)
+{
+        unsigned int swc_base_addr;
+
+        spin_lock(&io_lock);
+
+        pc87413_select_wdt_out();
+        pc87413_enable_swc();
+        swc_base_addr = pc87413_get_swc_base();
+        pc87413_swc_bank3(swc_base_addr);
+        pc87413_programm_wdto(swc_base_addr, timeout);
+        pc87413_enable_wden(swc_base_addr);
+        pc87413_enable_sw_wd_tren(swc_base_addr);
+        pc87413_enable_sw_wd_trg(swc_base_addr);
+
+        spin_unlock(&io_lock);
+}
+
+/* Disable the watchdog */
+
+static void pc87413_disable(void)
+{
+        unsigned int swc_base_addr;
+
+        spin_lock(&io_lock);
+
+        pc87413_select_wdt_out();
+        pc87413_enable_swc();
+        swc_base_addr = pc87413_get_swc_base();
+        pc87413_swc_bank3(swc_base_addr);
+        pc87413_disable_sw_wd_tren(swc_base_addr);
+        pc87413_disable_sw_wd_trg(swc_base_addr);
+        pc87413_programm_wdto(swc_base_addr, 0);
+
+        spin_unlock(&io_lock);
+}
+
+/* Refresh the watchdog */
+
+static void pc87413_refresh(void)
+{
+        unsigned int swc_base_addr;
+
+        spin_lock(&io_lock);
+
+        pc87413_select_wdt_out();
+        pc87413_enable_swc();
+        swc_base_addr = pc87413_get_swc_base();
+        pc87413_swc_bank3(swc_base_addr);
+        pc87413_disable_sw_wd_tren(swc_base_addr);
+        pc87413_disable_sw_wd_trg(swc_base_addr);
+        pc87413_programm_wdto(swc_base_addr, timeout);
+        pc87413_enable_wden(swc_base_addr);
+        pc87413_enable_sw_wd_tren(swc_base_addr);
+        pc87413_enable_sw_wd_trg(swc_base_addr);
+
+        spin_unlock(&io_lock);
+}
+
+/* -- File operations -------------------------------------------*/
+
+/**
+ *      pc87413_open:
+ *      @inode: inode of device
+ *      @file: file handle to device
+ *
+ */
+
+static int pc87413_open(struct inode *inode, struct file *file)
+{
+        /* /dev/watchdog can only be opened once */
+
+        if (test_and_set_bit(0, &timer_enabled))
+                return -EBUSY;
+
+        if (nowayout)
+                __module_get(THIS_MODULE);
+
+        /* Reload and activate timer */
+        pc87413_refresh();
+
+        printk(KERN_INFO MODNAME "Watchdog enabled. Timeout set to"
+                                 " %d minute(s).\n", timeout);
+
+        return nonseekable_open(inode, file);
+}
+
+/**
+ *      pc87413_release:
+ *      @inode: inode to board
+ *      @file: file handle to board
+ *
+ *      The watchdog has a configurable API. There is a religious dispute
+ *      between people who want their watchdog to be able to shut down and
+ *      those who want to be sure if the watchdog manager dies the machine
+ *      reboots. In the former case we disable the counters, in the latter
+ *      case you have to open it again very soon.
+ */
+
+static int pc87413_release(struct inode *inode, struct file *file)
+{
+        /* Shut off the timer. */
+
+        if (expect_close == 42) {
+                pc87413_disable();
+                printk(KERN_INFO MODNAME "Watchdog disabled,"
+                                         " sleeping again...\n");
+        } else {
+                printk(KERN_CRIT MODNAME "Unexpected close, not stopping"
+                                         " watchdog!\n");
+                pc87413_refresh();
+        }
+
+        clear_bit(0, &timer_enabled);
+        expect_close = 0;
+
+        return 0;
+}
+
+/**
+ *      pc87413_status:
+ *
+ *      return, if the watchdog is enabled (timeout is set...)
+ */
+
+
+static int pc87413_status(void)
+{
+          return 0; /* currently not supported */
+}
+
+/**
+ *      pc87413_write:
+ *      @file: file handle to the watchdog
+ *      @data: data buffer to write
+ *      @len: length in 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 we don't define content meaning.
+ */
+
+static ssize_t pc87413_write(struct file *file, const char __user *data,
+                             size_t len, loff_t *ppos)
+{
+        /* See if we got the magic character 'V' and reload the timer */
+        if (len) {
+                if (!nowayout) {
+                        size_t i;
+
+                        /* reset expect flag */
+                        expect_close = 0;
+
+                        /* scan to see whether or not we got the magic character */
+                        for (i = 0; i != len; i++) {
+                                char c;
+                                if (get_user(c, data+i))
+                                        return -EFAULT;
+                                if (c == 'V')
+                                        expect_close = 42;
+                        }
+                }
+
+                /* someone wrote to us, we should reload the timer */
+                pc87413_refresh();
+        }
+        return len;
+}
+
+/**
+ *      pc87413_ioctl:
+ *      @inode: inode of the device
+ *      @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. We only actually usefully support
+ *      querying capabilities and current status.
+ */
+
+static int pc87413_ioctl(struct inode *inode, struct file *file,
+                         unsigned int cmd, unsigned long arg)
+{
+        int new_timeout;
+
+        union {
+                struct watchdog_info __user *ident;
+                int __user *i;
+        } uarg;
+
+        static struct watchdog_info ident = {
+                .options          = WDIOF_KEEPALIVEPING |
+                                    WDIOF_SETTIMEOUT |
+                                    WDIOF_MAGICCLOSE,
+                .firmware_version = 1,
+                .identity         = "PC87413(HF/F) watchdog"
+        };
+
+        uarg.i = (int __user *)arg;
+
+        switch(cmd) {
+                default:
+                        return -ENOTTY;
+
+                case WDIOC_GETSUPPORT:
+                        return copy_to_user(uarg.ident, &ident,
+                                sizeof(ident)) ? -EFAULT : 0;
+
+                case WDIOC_GETSTATUS:
+                        return put_user(pc87413_status(), uarg.i);
+
+                case WDIOC_GETBOOTSTATUS:
+                        return put_user(0, uarg.i);
+
+                case WDIOC_KEEPALIVE:
+                        pc87413_refresh();
+#ifdef DEBUG
+                        printk(KERN_INFO DPFX "keepalive\n");
+#endif
+                        return 0;
+
+                case WDIOC_SETTIMEOUT:
+                        if (get_user(new_timeout, uarg.i))
+                                return -EFAULT;
+
+                        // the API states this is given in secs
+                        new_timeout /= 60;
+
+                        if (new_timeout < 0 || new_timeout > MAX_TIMEOUT)
+                                return -EINVAL;
+
+                        timeout = new_timeout;
+                        pc87413_refresh();
+
+                        // fall through and return the new timeout...
+
+                case WDIOC_GETTIMEOUT:
+
+                        new_timeout = timeout * 60;
+
+                        return put_user(new_timeout, uarg.i);
+
+                case WDIOC_SETOPTIONS:
+                {
+                        int options, retval = -EINVAL;
+
+                        if (get_user(options, uarg.i))
+                                return -EFAULT;
+
+                        if (options & WDIOS_DISABLECARD) {
+                                pc87413_disable();
+                                retval = 0;
+                        }
+
+                        if (options & WDIOS_ENABLECARD) {
+                                pc87413_enable();
+                                retval = 0;
+                        }
+
+                        return retval;
+                }
+        }
+}
+
+/* -- Notifier funtions -----------------------------------------*/
+
+/**
+ *      notify_sys:
+ *      @this: our notifier block
+ *      @code: the event being reported
+ *      @unused: unused
+ *
+ *      Our notifier is called on system shutdowns. We want to turn the card
+ *      off at reboot otherwise the machine will reboot again during memory
+ *      test or worse yet during the following fsck. This would suck, in fact
+ *      trust me - if it happens it does suck.
+ */
+
+static int pc87413_notify_sys(struct notifier_block *this,
+                              unsigned long code,
+                              void *unused)
+{
+        if (code == SYS_DOWN || code == SYS_HALT)
+        {
+                /* Turn the card off */
+                pc87413_disable();
+        }
+        return NOTIFY_DONE;
+}
+
+/* -- Module's structures ---------------------------------------*/
+
+static struct file_operations pc87413_fops = {
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .write          = pc87413_write,
+        .ioctl          = pc87413_ioctl,
+        .open           = pc87413_open,
+        .release        = pc87413_release,
+};
+
+static struct notifier_block pc87413_notifier =
+{
+        .notifier_call  = pc87413_notify_sys,
+};
+
+static struct miscdevice pc87413_miscdev=
+{
+        .minor          = WATCHDOG_MINOR,
+        .name           = "watchdog",
+        .fops           = &pc87413_fops
+};
+
+/* -- Module init functions -------------------------------------*/
+
+/**
+ *      pc87413_init: module's "constructor"
+ *
+ *      Set up the WDT watchdog board. All we have to do is grab the
+ *      resources we require and bitch if anyone beat us to them.
+ *      The open() function will actually kick the board off.
+ */
+
+static int __init pc87413_init(void)
+{
+        int ret;
+
+        spin_lock_init(&io_lock);
+
+        printk(KERN_INFO PFX "Version " VERSION " at io 0x%X\n", WDT_INDEX_IO_PORT);
+
+        /* request_region(io, 2, "pc87413"); */
+
+        ret = register_reboot_notifier(&pc87413_notifier);
+        if (ret != 0) {
+                printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+                        ret);
+        }
+
+        ret = misc_register(&pc87413_miscdev);
+
+        if (ret != 0) {
+                printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+                        WATCHDOG_MINOR, ret);
+                unregister_reboot_notifier(&pc87413_notifier);
+                return ret;
+        }
+
+        printk(KERN_INFO PFX "initialized. timeout=%d min \n", timeout);
+
+        pc87413_enable();
+
+        return 0;
+}
+
+/**
+ *      pc87413_exit: module's "destructor"
+ *
+ *      Unload the watchdog. You cannot do this with any file handles open.
+ *      If your watchdog is set to continue ticking on close and you unload
+ *      it, well it keeps ticking. We won't get the interrupt but the board
+ *      will not touch PC memory so all is fine. You just have to load a new
+ *      module in 60 seconds or reboot.
+ */
+
+static void __exit pc87413_exit(void)
+{
+        /* Stop the timer before we leave */
+        if (!nowayout)
+        {
+                pc87413_disable();
+                printk(KERN_INFO MODNAME "Watchdog disabled.\n");
+        }
+
+        misc_deregister(&pc87413_miscdev);
+        unregister_reboot_notifier(&pc87413_notifier);
+        /* release_region(io,2); */
+
+        printk(MODNAME " watchdog component driver removed.\n");
+}
+
+module_init(pc87413_init);
+module_exit(pc87413_exit);
+
+MODULE_AUTHOR("Sven Anders <anders@anduras.de>, Marcus Junker <junker@anduras.de>,");
+MODULE_DESCRIPTION("PC87413 WDT driver");
+MODULE_LICENSE("GPL");
+
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+
+module_param(io, int, 0);
+MODULE_PARM_DESC(io, MODNAME " I/O port (default: " __MODULE_STRING(io) ").");
+
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes (default=" __MODULE_STRING(timeout) ").");
+
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
+