Initial import

1 files changed, 595 insertions, 0 deletions

diff --git a/drivers/watchdog/pc87413_wdt.c b/drivers/watchdog/pc87413_wdt.c
new file mode 100644
index 000000000..9f15dd943
--- /dev/null
+++ b/drivers/watchdog/pc87413_wdt.c
@@ -0,0 +1,595 @@
+/*
+ *      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
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#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/io.h>
+#include <linux/uaccess.h>
+
+
+/* #define DEBUG 1 */
+
+#define DEFAULT_TIMEOUT     1		/* 1 minute */
+#define MAX_TIMEOUT         255
+
+#define VERSION             "1.1"
+#define MODNAME             "pc87413 WDT"
+#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-Control-Register */
+#define WDTO                0x11	/* Watchdog timeout register */
+#define WDCFG               0x12	/* Watchdog config register */
+
+#define IO_DEFAULT	0x2E		/* Address used on Portwell Boards */
+
+static int io = IO_DEFAULT;
+static int swc_base_addr = -1;
+
+static int timeout = DEFAULT_TIMEOUT;	/* timeout value */
+static unsigned long timer_enabled;	/* is the timer enabled? */
+
+static char expect_close;		/* is the close expected? */
+
+static DEFINE_SPINLOCK(io_lock);	/* to guard us from io races */
+
+static bool 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
+	pr_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
+	pr_info(DPFX "pc87413 - Enable SWC functions\n");
+#endif
+}
+
+/* Read SWC I/O base address */
+
+static void pc87413_get_swc_base_addr(void)
+{
+	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
+	pr_info(DPFX
+		"Read SWC I/O Base Address: low %d, high %d, res %d\n",
+						addr_l, addr_h, swc_base_addr);
+#endif
+}
+
+/* Select Bank 3 of SWC */
+
+static inline void pc87413_swc_bank3(void)
+{
+	/* Step 4: Select Bank3 of SWC */
+	outb_p(inb(swc_base_addr + 0x0f) | 0x03, swc_base_addr + 0x0f);
+#ifdef DEBUG
+	pr_info(DPFX "Select Bank3 of SWC\n");
+#endif
+}
+
+/* Set watchdog timeout to x minutes */
+
+static inline void pc87413_programm_wdto(char pc87413_time)
+{
+	/* Step 5: Programm WDTO, Twd. */
+	outb_p(pc87413_time, swc_base_addr + WDTO);
+#ifdef DEBUG
+	pr_info(DPFX "Set WDTO to %d minutes\n", pc87413_time);
+#endif
+}
+
+/* Enable WDEN */
+
+static inline void pc87413_enable_wden(void)
+{
+	/* Step 6: Enable WDEN */
+	outb_p(inb(swc_base_addr + WDCTL) | 0x01, swc_base_addr + WDCTL);
+#ifdef DEBUG
+	pr_info(DPFX "Enable WDEN\n");
+#endif
+}
+
+/* Enable SW_WD_TREN */
+static inline void pc87413_enable_sw_wd_tren(void)
+{
+	/* Enable SW_WD_TREN */
+	outb_p(inb(swc_base_addr + WDCFG) | 0x80, swc_base_addr + WDCFG);
+#ifdef DEBUG
+	pr_info(DPFX "Enable SW_WD_TREN\n");
+#endif
+}
+
+/* Disable SW_WD_TREN */
+
+static inline void pc87413_disable_sw_wd_tren(void)
+{
+	/* Disable SW_WD_TREN */
+	outb_p(inb(swc_base_addr + WDCFG) & 0x7f, swc_base_addr + WDCFG);
+#ifdef DEBUG
+	pr_info(DPFX "pc87413 - Disable SW_WD_TREN\n");
+#endif
+}
+
+/* Enable SW_WD_TRG */
+
+static inline void pc87413_enable_sw_wd_trg(void)
+{
+	/* Enable SW_WD_TRG */
+	outb_p(inb(swc_base_addr + WDCTL) | 0x80, swc_base_addr + WDCTL);
+#ifdef DEBUG
+	pr_info(DPFX "pc87413 - Enable SW_WD_TRG\n");
+#endif
+}
+
+/* Disable SW_WD_TRG */
+
+static inline void pc87413_disable_sw_wd_trg(void)
+{
+	/* Disable SW_WD_TRG */
+	outb_p(inb(swc_base_addr + WDCTL) & 0x7f, swc_base_addr + WDCTL);
+#ifdef DEBUG
+	pr_info(DPFX "Disable SW_WD_TRG\n");
+#endif
+}
+
+/* -- Higher level functions ------------------------------------*/
+
+/* Enable the watchdog */
+
+static void pc87413_enable(void)
+{
+	spin_lock(&io_lock);
+
+	pc87413_swc_bank3();
+	pc87413_programm_wdto(timeout);
+	pc87413_enable_wden();
+	pc87413_enable_sw_wd_tren();
+	pc87413_enable_sw_wd_trg();
+
+	spin_unlock(&io_lock);
+}
+
+/* Disable the watchdog */
+
+static void pc87413_disable(void)
+{
+	spin_lock(&io_lock);
+
+	pc87413_swc_bank3();
+	pc87413_disable_sw_wd_tren();
+	pc87413_disable_sw_wd_trg();
+	pc87413_programm_wdto(0);
+
+	spin_unlock(&io_lock);
+}
+
+/* Refresh the watchdog */
+
+static void pc87413_refresh(void)
+{
+	spin_lock(&io_lock);
+
+	pc87413_swc_bank3();
+	pc87413_disable_sw_wd_tren();
+	pc87413_disable_sw_wd_trg();
+	pc87413_programm_wdto(timeout);
+	pc87413_enable_wden();
+	pc87413_enable_sw_wd_tren();
+	pc87413_enable_sw_wd_trg();
+
+	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();
+
+	pr_info("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();
+		pr_info("Watchdog disabled, sleeping again...\n");
+	} else {
+		pr_crit("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:
+ *	@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 long pc87413_ioctl(struct file *file, unsigned int cmd,
+						unsigned long arg)
+{
+	int new_timeout;
+
+	union {
+		struct watchdog_info __user *ident;
+		int __user *i;
+	} uarg;
+
+	static const 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) {
+	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_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;
+	}
+	case WDIOC_KEEPALIVE:
+		pc87413_refresh();
+#ifdef DEBUG
+		pr_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);
+	default:
+		return -ENOTTY;
+	}
+}
+
+/* -- 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 const struct file_operations pc87413_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= pc87413_write,
+	.unlocked_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;
+
+	pr_info("Version " VERSION " at io 0x%X\n",
+							WDT_INDEX_IO_PORT);
+
+	if (!request_muxed_region(io, 2, MODNAME))
+		return -EBUSY;
+
+	ret = register_reboot_notifier(&pc87413_notifier);
+	if (ret != 0)
+		pr_err("cannot register reboot notifier (err=%d)\n", ret);
+
+	ret = misc_register(&pc87413_miscdev);
+	if (ret != 0) {
+		pr_err("cannot register miscdev on minor=%d (err=%d)\n",
+		       WATCHDOG_MINOR, ret);
+		goto reboot_unreg;
+	}
+	pr_info("initialized. timeout=%d min\n", timeout);
+
+	pc87413_select_wdt_out();
+	pc87413_enable_swc();
+	pc87413_get_swc_base_addr();
+
+	if (!request_region(swc_base_addr, 0x20, MODNAME)) {
+		pr_err("cannot request SWC region at 0x%x\n", swc_base_addr);
+		ret = -EBUSY;
+		goto misc_unreg;
+	}
+
+	pc87413_enable();
+
+	release_region(io, 2);
+	return 0;
+
+misc_unreg:
+	misc_deregister(&pc87413_miscdev);
+reboot_unreg:
+	unregister_reboot_notifier(&pc87413_notifier);
+	release_region(io, 2);
+	return ret;
+}
+
+/**
+ *	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();
+		pr_info("Watchdog disabled\n");
+	}
+
+	misc_deregister(&pc87413_miscdev);
+	unregister_reboot_notifier(&pc87413_notifier);
+	release_region(swc_base_addr, 0x20);
+
+	pr_info("watchdog component driver removed\n");
+}
+
+module_init(pc87413_init);
+module_exit(pc87413_exit);
+
+MODULE_AUTHOR("Sven Anders <anders@anduras.de>");
+MODULE_AUTHOR("Marcus Junker <junker@anduras.de>");
+MODULE_DESCRIPTION("PC87413 WDT driver");
+MODULE_LICENSE("GPL");
+
+module_param(io, int, 0);
+MODULE_PARM_DESC(io, MODNAME " I/O port (default: "
+					__MODULE_STRING(IO_DEFAULT) ").");
+
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout,
+		"Watchdog timeout in minutes (default="
+				__MODULE_STRING(DEFAULT_TIMEOUT) ").");
+
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout,
+		"Watchdog cannot be stopped once started (default="
+				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+