--- /dev/null
+/*
+ * 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);
+
projects / linux-drm-fsl-dcu.git / commitdiff