[WATCHDOG] NS pc87413-wdt Watchdog driver

New watchdog driver for the NS pc87413-wdt Watchdog Timer.
 
Signed-off-by: Sven Anders <anders@anduras.de>
Signed-off-by: Marcus Junker <junker@anduras.de>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 610 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..a6d42cf385e6
--- /dev/null
+++ b/drivers/char/watchdog/pc87413_wdt.c
@@ -0,0 +1,610 @@
+/*
+ *      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 Marcus Junker, <junker@anduras.de>
+ *                     and Sven Anders, <anders@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 Marcus Junker, Sven Anders nor ANDURAS AG
+ *      admit liability nor provide warranty for any of this software.
+ *      This material is provided "AS-IS" and at no charge.
+ *
+ *      Release 1.00.
+ *
+ */
+
+
+/* #define DEBUG 1 */
+
+#include <linux/config.h>
+#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 WATCHDOG_NAME "pc87413 WDT"
+#define PFX WATCHDOG_NAME ": "
+#define DPFX WATCHDOG_NAME " - DEBUG: "
+
+#define WDT_INDEX_IO_PORT   (io+0)                /* */
+#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 */
+
+#define WD_TIMEOUT 1                               /* minutes (1 ... 255) */
+
+
+static int pc87413_is_open=0;
+
+/*
+ *      You must set these - there is no sane way to probe for this board.
+ *      You can use pc87413=x to set these now.
+ */
+
+
+
+/**
+ *      module_params
+ *
+ *      Setup options. The board isn't really probe-able so we have to
+ *      get the user to tell us the configuration.
+ */
+
+static int io=0x2E;             /* Normally used addres on Portwell Boards */
+module_param(io, int, 0);
+MODULE_PARM_DESC(wdt_io, WATCHDOG_NAME  " io port (default 0x2E)");
+
+static int timeout = WD_TIMEOUT;  /* in minutes */
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in minutes. 1<= timeout <=63, default=" __MODULE_STRING(WD_TIMEOUT) ".");
+
+
+/******************************************
+ *      Helper functions
+ ******************************************/
+
+static void
+pc87413_select_wdt_out (void)
+{
+
+        unsigned int    cr_data=0;
+
+        /* 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
+}
+
+static 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
+}
+
+static 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;
+}
+
+static 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
+
+}
+
+static 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
+}
+
+static 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
+}
+
+static 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
+}
+
+static 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
+}
+
+
+static 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
+}
+
+static 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
+}
+
+
+
+static void
+pc87413_disable(void)
+{
+        unsigned int    swc_base_addr;
+
+        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);
+}
+
+
+static void
+pc87413_refresh(char pc87413_time)
+{
+        unsigned int    swc_base_addr;
+
+        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, pc87413_time);
+        pc87413_enable_wden(swc_base_addr);
+        pc87413_enable_sw_wd_tren(swc_base_addr);
+        pc87413_enable_sw_wd_trg(swc_base_addr);
+}
+
+
+static void
+pc87413_enable(char pc87413_time)
+{
+        unsigned int    swc_base_addr;
+
+        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, pc87413_time);
+        pc87413_enable_wden(swc_base_addr);
+        pc87413_enable_sw_wd_tren(swc_base_addr);
+        pc87413_enable_sw_wd_trg(swc_base_addr);
+
+}
+
+
+/*******************************************
+ *      Kernel methods.
+ *******************************************/
+
+
+/**
+ *      pc87413_status:
+ *
+ *      Extract the status information from a WDT watchdog device. There are
+ *      several board variants so we have to know which bits are valid. Some
+ *      bits default to one and some to zero in order to be maximally painful.
+ *
+ *      we then map the bits onto the status ioctl flags.
+ */
+
+static int pc87413_status(void)
+{
+        /* Not supported */
+
+        return 1;
+}
+
+static long long pc87413_llseek(struct file *file, long long offset, int origin)
+{
+        return -ESPIPE;
+}
+
+/**
+ *      pc87413_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 we don't define content meaning.
+ */
+
+static ssize_t
+pc87413_write (struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+{
+        if (count) {
+                pc87413_refresh (WD_TIMEOUT);
+                #ifdef DEBUG
+                printk(KERN_INFO DPFX "Write\n");
+                #endif
+        }
+        return count;
+}
+
+/*
+ *      Read reports the temperature in degrees Fahrenheit.
+ */
+static ssize_t
+pc87413_read(struct file *file, char *buf, size_t count, loff_t *ptr)
+{
+
+//      char timeout;
+//
+//      outb_p(0x08, WDT_EFER);         /* Select locical device 8 */
+//      outb_p(0x0F6, WDT_EFER);                /* Select CRF6 */
+//      timeout = inb(WDT_EFDR);        /* Read Timeout counter from CRF6 */
+
+
+//      if(copy_to_user(buf,&timeout,1))
+//              return -EFAULT;
+        return 1;
+
+
+}
+
+ /**
+ *      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)
+{
+        static struct watchdog_info ident=
+        {
+                .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+                .firmware_version = 1,
+                .identity = "pc87413(HF/F)"
+        };
+
+        ident.options=1;        /* Mask down to the card we have */
+
+        switch(cmd)
+        {
+                default:
+                        return -ENOIOCTLCMD;
+                case WDIOC_GETSUPPORT:
+                        return copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))?-EFAULT:0;
+                case WDIOC_GETSTATUS:
+                        return put_user(pc87413_status(),(int *)arg);
+                case WDIOC_GETBOOTSTATUS:
+                        return put_user(0, (int *)arg);
+                case WDIOC_KEEPALIVE:
+                        pc87413_refresh(WD_TIMEOUT);
+                        #ifdef DEBUG
+                        printk(KERN_INFO DPFX "keepalive\n");
+                        #endif
+                        return 0;
+        }
+}
+
+/**
+ *      pc87413_open:
+ *      @inode: inode of device
+ *      @file: file handle to device
+ *
+ *      One of our two misc devices has been opened. The watchdog device is
+ *      single open and on opening we load the counters. Counter zero is a
+ *      100Hz cascade, into counter 1 which downcounts to reboot. When the
+ *      counter triggers counter 2 downcounts the length of the reset pulse
+ *      which set set to be as long as possible.
+ */
+
+static int
+pc87413_open(struct inode *inode, struct file *file)
+{
+        switch(MINOR(inode->i_rdev))
+        {
+                case WATCHDOG_MINOR:
+                        if(pc87413_is_open)
+                                return -EBUSY;
+                        /*
+                         *      Activate
+                         */
+
+                        pc87413_is_open=1;
+                        pc87413_refresh(WD_TIMEOUT);
+                        #ifdef DEBUG
+                        printk(KERN_INFO DPFX "Open\n");
+                        #endif
+                        return 0;
+                case TEMP_MINOR:
+                        return 0;
+                default:
+                        return -ENODEV;
+        }
+}
+
+/**
+ *      pc87413_close:
+ *      @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)
+{
+        if(MINOR(inode->i_rdev)==WATCHDOG_MINOR)
+        {
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+                pc87413_disable();
+#endif
+                pc87413_is_open=0;
+                #ifdef DEBUG
+                printk(KERN_INFO DPFX "Release\n");
+                #endif
+        }
+        return 0;
+}
+
+/**
+ *      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;
+}
+
+
+/*****************************************************
+ *      Kernel Interfaces
+ *****************************************************/
+
+
+static struct file_operations pc87413_fops = {
+        .owner          = THIS_MODULE,
+        .llseek         = pc87413_llseek,
+        .read           = pc87413_read,
+        .write          = pc87413_write,
+        .ioctl          = pc87413_ioctl,
+        .open           = pc87413_open,
+        .release        = pc87413_release,
+};
+
+static struct miscdevice pc87413_miscdev=
+{
+        .minor = WATCHDOG_MINOR,
+        .name = "watchdog",
+        .fops = &pc87413_fops
+};
+
+/*
+ *      The WDT card needs to learn about soft shutdowns in order to
+ *      turn the timebomb registers off.
+ */
+
+static struct notifier_block pc87413_notifier=
+{
+        pc87413_notify_sys,
+        NULL,
+        0
+};
+
+
+/**
+ *      pc87413_exit:
+ *
+ *      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
+pc87413_exit(void)
+{
+        pc87413_disable();
+        misc_deregister(&pc87413_miscdev);
+        unregister_reboot_notifier(&pc87413_notifier);
+        /* release_region(io,2); */
+}
+
+
+/**
+ *      pc87413_init:
+ *
+ *      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
+pc87413_init(void)
+{
+        int ret;
+
+        printk(KERN_INFO PFX "Version 1.00 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(WD_TIMEOUT);
+
+        return 0;
+}
+
+
+module_init(pc87413_init);
+module_exit(pc87413_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marcus Junker <junker@anduras.de>, Sven Anders <anders@anduras.de>");
+MODULE_DESCRIPTION("PC87413 WDT driver");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+