Date:	Fri, 03 Jan 2014 21:44:59 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	eric.ernst@...ux.intel.com, wim@...ana.be,
	linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
CC:	Gabriel Touzeau <gabrielx.touzeau@...el.com>,
	Yann Puech <yann.puech@...el.com>,
	Jeremy Compostella <jeremy.compostella@...el.com>,
	David Cohen <david.a.cohen@...ux.intel.com>
Subject: Re: [PATCH 1/1] watchdog: Adding Merrifield watchdog driver support

On 01/02/2014 04:56 PM, eric.ernst@...ux.intel.com wrote:
> From: Gabriel Touzeau <gabrielx.touzeau@...el.com>
>
> Added Merrifield watchdog driver support.
>
> Based on initial implementation from prior Intel SCU-based platforms, this
> driver has several changes specific to the Tangier SoC / Merrifield platform.
>
New watchdog drivers should be implemented using the watchdog subsystem.

> Signed-off-by: Eric Ernst <eric.ernst@...ux.intel.com>
> Signed-off-by: Yann Puech <yann.puech@...el.com>
> Signed-off-by: Jeremy Compostella <jeremy.compostella@...el.com>
> Signed-off-by: Gabriel Touzeau <gabrielx.touzeau@...el.com>
> Cc: David Cohen <david.a.cohen@...ux.intel.com>
> ---
>   drivers/watchdog/Kconfig                  |   12 +
>   drivers/watchdog/Makefile                 |    1 +
>   drivers/watchdog/intel_scu_watchdog_evo.c |  587 +++++++++++++++++++++++++++++
>   drivers/watchdog/intel_scu_watchdog_evo.h |   54 +++
>   4 files changed, 654 insertions(+)
>   create mode 100644 drivers/watchdog/intel_scu_watchdog_evo.c
>   create mode 100644 drivers/watchdog/intel_scu_watchdog_evo.h
>
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index d1d53f301de7..bb3ef92d2788 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -616,6 +616,18 @@ config INTEL_SCU_WATCHDOG
>
>   	  To compile this driver as a module, choose M here.
>
> +config INTEL_SCU_WATCHDOG_EVO
> +	bool "Intel SCU Watchdog Evolution for Mobile Platforms"
> +	depends on X86_INTEL_MID
> +	---help---
> +	  Hardware driver evolution for the watchdog timer built into the Intel
> +	  SCU for Intel Mobile Platforms.
> +
> +	  This driver supports the watchdog evolution implementation in SCU,

"watchdog evolution" ... odd terminology.

> +	  available for Merrifield generation.
> +
> +	  To compile this driver as a module, choose M here.
> +
>   config ITCO_WDT
>   	tristate "Intel TCO Timer/Watchdog"
>   	depends on (X86 || IA64) && PCI
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index 6c5bb274d3cd..e4b150efa938 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -112,6 +112,7 @@ obj-$(CONFIG_W83977F_WDT) += w83977f_wdt.o
>   obj-$(CONFIG_MACHZ_WDT) += machzwd.o
>   obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc_epx_c3.o
>   obj-$(CONFIG_INTEL_SCU_WATCHDOG) += intel_scu_watchdog.o
> +obj-$(CONFIG_INTEL_SCU_WATCHDOG_EVO) += intel_scu_watchdog_evo.o
>
>   # M32R Architecture
>
> diff --git a/drivers/watchdog/intel_scu_watchdog_evo.c b/drivers/watchdog/intel_scu_watchdog_evo.c
> new file mode 100644
> index 000000000000..fc9a37a33ddd
> --- /dev/null
> +++ b/drivers/watchdog/intel_scu_watchdog_evo.c
> @@ -0,0 +1,587 @@
> +/*
> + *      intel_scu_watchdog_evo:  An Intel SCU IOH Based Watchdog Device
> + *			for Tangier SoC (Merrifield platform)
> + *
> + *      Based on previous intel_scu based watchdog driver, intel_scu_watchdog.
> + *
> + *      Copyright (C) 2009-2013 Intel Corporation. All rights reserved.
> + *
> + *      This program is free software; you can redistribute it and/or
> + *      modify it under the terms of version 2 of the GNU General
> + *      Public License as published by the Free Software Foundation.
> + *
> + *      This program is distributed in the hope that it will be
> + *      useful, but WITHOUT ANY WARRANTY; without even the implied
> + *      warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
> + *      PURPOSE.  See the GNU General Public License for more details.
> + *      You should have received a copy of the GNU General Public
> + *      License along with this program; if not, write to the Free
> + *      Software Foundation, Inc., 59 Temple Place - Suite 330,
> + *      Boston, MA  02111-1307, USA.
> + *      The full GNU General Public License is included in this
> + *      distribution in the file called COPYING.
> + *

Providing the FSF address is discouraged, and using it results in checkpatch errors.

> + */
> +
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
> +#include <linux/interrupt.h>
> +#include <linux/kernel_stat.h>
> +#include <linux/miscdevice.h>
> +#include <linux/module.h>
> +#include <linux/nmi.h>
> +#include <linux/reboot.h>
> +#include <linux/fs.h>
> +#include <linux/watchdog.h>
> +#include <asm/intel-mid.h>
> +#include <asm/intel_scu_ipc.h>
> +
> +#include "intel_scu_watchdog_evo.h"
> +
> +/* Defines */
> +#define STRING_RESET_TYPE_MAX_LEN   11
> +#define STRING_COLD_OFF             "COLD_OFF"
> +#define STRING_COLD_RESET           "COLD_RESET"
> +#define STRING_COLD_BOOT            "COLD_BOOT"
> +
> +#define EXT_TIMER0_MSI 15
> +
> +#define IPC_WATCHDOG 0xf8
> +
> +/* watchdog message options */
> +enum {
> +	SCU_WATCHDOG_START = 0,
> +	SCU_WATCHDOG_STOP,
> +	SCU_WATCHDOG_KEEPALIVE,
> +	SCU_WATCHDOG_SET_ACTION_ON_TIMEOUT
> +};
> +
> +/* watchdog reset options */
> +enum {
> +	SCU_COLD_OFF_ON_TIMEOUT = 0,
> +	SCU_COLD_RESET_ON_TIMEOUT,
> +	SCU_COLD_BOOT_ON_TIMEOUT,
> +	SCU_DO_NOTHING_ON_TIMEOUT
> +};
> +
> +/* Statics */
> +static struct intel_scu_watchdog_dev watchdog_device;
> +
> +/* Module params */
> +static bool disable_kernel_watchdog;
> +module_param(disable_kernel_watchdog, bool, S_IRUGO);
> +MODULE_PARM_DESC(disable_kernel_watchdog,
> +		"Disable kernel watchdog"
> +		"Set to 0, watchdog started at boot"
> +		"and left running; Set to 1; watchdog"
> +		"is not started until user space"
> +		"watchdog daemon is started; also if the"
> +		"timer is started by the iafw firmware, it"
> +		"will be disabled upon initialization of this"
> +		"driver if disable_kernel_watchdog is set");
> +
> +static int pre_timeout = DEFAULT_PRETIMEOUT;
> +module_param(pre_timeout, int, S_IRUGO | S_IWUSR);
> +MODULE_PARM_DESC(pre_timeout,
> +		"Watchdog pre timeout"
> +		"Time between interrupt and resetting the system"
> +		"The range is from 1 to 160");
> +
> +static int timeout = DEFAULT_TIMEOUT;
> +module_param(timeout, int, S_IRUGO | S_IWUSR);
> +MODULE_PARM_DESC(timeout,
> +		"Default Watchdog timer setting"
> +		"Complete cycle time"
> +		"The range is from 1 to 170"
> +		"This is the time for all keep alives to arrive");
> +
> +/* Setting reset_on_release will cause an immediate reset when the watchdog
> + * is released. If false, the watchdog timer is refreshed for one more
> + * interval. At the end of that interval, the watchdog timer will reset the
> + * system.
> + */
> +static bool reset_on_release = true;
> +
> +/* Check current timeouts */
> +static int check_timeouts(int pre_timeout_time, int timeout_time)
> +{
> +	if (pre_timeout_time < timeout_time)
> +		return 0;
> +
> +	return -EINVAL;
> +}
> +
> +/* Set the different timeouts needed by the SCU FW and start the
> + * kernel watchdog */
> +static int watchdog_set_timeouts_and_start(int pretimeout,
> +					   int timeout)
> +{
> +	int ret, input_size;
> +	struct ipc_wd_start {
> +		u32 pretimeout;
> +		u32 timeout;
> +	} ipc_wd_start = { pretimeout, timeout };
> +
> +	/* SCU expects the input size for watchdog IPC to
> +	 * be based on double-word */
> +	input_size = (sizeof(ipc_wd_start) + 3) / 4;
> +
> +	ret = intel_scu_ipc_command(IPC_WATCHDOG,
> +				    SCU_WATCHDOG_START, (u32 *)&ipc_wd_start,
> +				    input_size, NULL, 0);
> +	if (ret) {
> +		pr_crit("Error configuring and starting watchdog: %d\n",
> +			ret);
> +		return -EIO;
> +	}
> +
> +	return 0;
> +}
> +
> +/* Provisioning function for future enhancement : allow to fine tune timing
> +   according to watchdog action settings */
> +static int watchdog_set_appropriate_timeouts(void)
> +{
> +	pr_debug("Setting shutdown timeouts\n");
> +	return watchdog_set_timeouts_and_start(pre_timeout, timeout);
> +}
> +
> +/* Keep alive  */
> +static int watchdog_keepalive(void)
> +{
> +	int ret;
> +
> +	/* Pet the watchdog */
> +	ret = intel_scu_ipc_command(IPC_WATCHDOG,
> +					SCU_WATCHDOG_KEEPALIVE, NULL, 0, NULL, 0);
> +	if (ret) {
> +		pr_crit("Error executing keepalive: %x\n", ret);
> +		return -EIO;
> +	}
> +
> +	return 0;
> +}
> +
> +/* stops the timer */
> +static int watchdog_stop(void)
> +{
> +	int ret;
> +
> +	watchdog_device.started = false;
> +
> +	ret = intel_scu_ipc_command(IPC_WATCHDOG,
> +					SCU_WATCHDOG_STOP, NULL, 0, NULL, 0);
> +	if (ret) {
> +		pr_crit("Error stopping watchdog: %x\n", ret);
> +		return -EIO;
> +	}
> +	return 0;
> +}
> +
> +/* warning interrupt handler */
> +static irqreturn_t watchdog_warning_interrupt(int irq, void *dev_id)
> +{
> +	pr_warn("[SHTDWN] %s, WATCHDOG TIMEOUT!\n", __func__);
> +
> +	/* Let's reset the platform after dumping some data */
> +	trigger_all_cpu_backtrace();
> +	panic("Kernel Watchdog");
> +
> +	/* This code should not be reached */
> +	return IRQ_HANDLED;
> +}
> +
> +/* Program and starts the timer */
> +static int watchdog_config_and_start(u32 newtimeout, u32 newpretimeout)
> +{
> +	int ret;
> +
> +	timeout = newtimeout;
> +	pre_timeout = newpretimeout;
> +
> +	pr_info("timeout=%ds, pre_timeout=%ds\n", timeout, pre_timeout);
> +
> +	/* Configure the watchdog */
> +	ret = watchdog_set_timeouts_and_start(pre_timeout, timeout);
> +	if (ret) {
> +		pr_err("%s: Cannot configure the watchdog\n", __func__);
> +
> +		/* Make sure the watchdog timer is stopped */
> +		watchdog_stop();
> +		return ret;
> +	}
> +
> +	watchdog_device.started = true;
> +
> +	return 0;
> +}
> +
> +/* Open */
> +static int intel_scu_open(struct inode *inode, struct file *file)
> +{
> +	/* Set flag to indicate that watchdog device is open */
> +	if (test_and_set_bit(0, &watchdog_device.driver_open)) {
> +		pr_err("watchdog device is busy\n");
> +		return -EBUSY;
> +	}
> +
> +	return nonseekable_open(inode, file);
> +}
> +
> +/* Release */
> +static int intel_scu_release(struct inode *inode, struct file *file)
> +{
> +	/*
> +	 * This watchdog should not be closed after the timer
> +	 * is started with the WDIPC_SETTIMEOUT ioctl.
> +	 * If reset_on_release is set this  will cause an
> +	 * immediate reset. If reset_on_release is not set, the watchdog
> +	 * timer is refreshed for one more interval. At the end
> +	 * of that interval, the watchdog timer will reset the system.
> +	 */
> +
> +	if (!test_bit(0, &watchdog_device.driver_open)) {
> +		pr_err("intel_scu_release, without open\n");
> +		return -ENOTTY;
> +	}
> +
> +	if (!watchdog_device.started) {
> +		/* Just close, since timer has not been started */
> +		pr_err("Closed, without starting timer\n");
> +		return 0;
> +	}
> +
> +	/* The watchdog should not be closed after the timer is started */
> +	pr_crit("Unexpected close of /dev/watchdog!\n");
> +
> +	/* Refresh the timer for one more interval */
> +	watchdog_keepalive();
> +
> +	/* Reboot system if requested */
> +	if (reset_on_release) {
> +		pr_crit("Initiating system reboot.\n");
> +		emergency_restart();
> +	}
> +
> +	pr_crit("Immediate Reboot Disabled\n");
> +	pr_crit("System will reset when watchdog timer expire!\n");
> +
> +	return 0;
> +}
> +
> +/* Write */
> +static ssize_t intel_scu_write(struct file *file, char const *data, size_t len,
> +			      loff_t *ppos)
> +{
> +	if (watchdog_device.shutdown_flag == true)
> +		/* do nothing if we are shutting down */
> +		return len;
> +
> +	if (watchdog_device.started) {
> +		/* Watchdog already started, keep it alive */
> +		watchdog_keepalive();
> +	}
> +
> +	return len;
> +}
> +
> +/* ioctl */
> +static long intel_scu_ioctl(struct file *file, unsigned int cmd,
> +			    unsigned long arg)
> +{
> +	void __user *argp = (void __user *)arg;
> +	u32 __user *p = argp;
> +	u32 val;
> +	int options;
> +
> +	static const struct watchdog_info ident = {
> +		.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
> +		/* @todo Get from SCU via ipc_get_scu_fw_version */
> +		.firmware_version = 0,
> +		/* len < 32 */
> +		.identity = "Intel_SCU IOH Watchdog"
> +	};
> +
> +	switch (cmd) {
> +	case WDIOC_GETSUPPORT:
> +		return copy_to_user(argp, &ident,
> +				    sizeof(ident)) ? -EFAULT : 0;
> +	case WDIOC_GETSTATUS:
> +	case WDIOC_GETBOOTSTATUS:
> +		return put_user(0, p);
> +	case WDIOC_KEEPALIVE:
> +		if (!watchdog_device.started)
> +			return -EINVAL;
> +
> +		watchdog_keepalive();
> +		return 0;
> +	case WDIOC_SETPRETIMEOUT:
> +		pr_info("%s: setpretimeout ioctl\n", __func__);
> +
> +		if (watchdog_device.started)
> +			return -EBUSY;
> +
> +		/* Timeout to warn */
> +		if (get_user(val, p))
> +			return -EFAULT;
> +
> +		pre_timeout = val;
> +		return 0;
> +	case WDIOC_SETTIMEOUT:
> +		pr_info("%s: settimeout ioctl\n", __func__);
> +
> +		if (watchdog_device.started)
> +			return -EBUSY;
> +
> +		if (get_user(val, p))
> +			return -EFAULT;
> +
> +		timeout = val;
> +		return 0;
> +	case WDIOC_GETTIMEOUT:
> +		return put_user(timeout, p);
> +	case WDIOC_SETOPTIONS:
> +		if (get_user(options, p))
> +			return -EFAULT;
> +
> +		if (options & WDIOS_DISABLECARD) {
> +			pr_info("%s: Stopping the watchdog\n", __func__);
> +			watchdog_stop();
> +			return 0;
> +		}
> +
> +		if (options & WDIOS_ENABLECARD) {
> +			pr_info("%s: Starting the watchdog\n", __func__);
> +
> +			if (watchdog_device.started)
> +				return -EBUSY;
> +
> +			if (check_timeouts(pre_timeout, timeout)) {
> +				pr_warn("%s: Invalid thresholds\n",
> +					__func__);
> +				return -EINVAL;
> +			}
> +			if (watchdog_config_and_start(timeout, pre_timeout))
> +				return -EINVAL;
> +			return 0;
> +		}
> +		return 0;
> +	default:
> +		return -ENOTTY;
> +	}
> +}
> +
> +static int watchdog_set_reset_type(int reset_type)
> +{
> +	int ret, input_size;
> +	u32 ipc_wd_on_timeout = reset_type;
> +
> +	/* SCU expects the input size for watchdog IPC to
> +	 * be based on double-word */
> +	input_size = (sizeof(ipc_wd_on_timeout) + 3) / 4;
> +
> +	ret = intel_scu_ipc_command(IPC_WATCHDOG,
> +				    SCU_WATCHDOG_SET_ACTION_ON_TIMEOUT,
> +				    (u32 *)&ipc_wd_on_timeout,
> +				    input_size, NULL, 0);
> +	if (ret) {
> +		pr_crit("Error setting watchdog action: %d\n", ret);
> +		return -EIO;
> +	}
> +
> +	watchdog_device.normal_wd_action = reset_type;
> +
> +	return 0;
> +}
> +
> +/* Reboot notifier */
> +static int reboot_notifier(struct notifier_block *this,
> +			   unsigned long code,
> +			   void *another_unused)
> +{
> +	int ret;
> +
> +	if (code == SYS_RESTART || code == SYS_HALT || code == SYS_POWER_OFF) {
> +		pr_warn("Reboot notifier\n");
> +
> +		if (watchdog_set_appropriate_timeouts())
> +			pr_crit("reboot notifier can't set time\n");
> +
> +		switch (code) {
> +		case SYS_RESTART:
> +			ret = watchdog_set_reset_type(
> +				watchdog_device.reboot_wd_action);
> +			break;
> +
> +		case SYS_HALT:
> +		case SYS_POWER_OFF:
> +			ret = watchdog_set_reset_type(
> +				watchdog_device.shutdown_wd_action);
> +			break;
> +		}
> +		if (ret)
> +			pr_err("%s: could not set reset type\n", __func__);
> +
> +		/* Don't do instant reset on close */
> +		reset_on_release = false;
> +
> +		/* Kick once again */
> +		if (disable_kernel_watchdog == false) {
> +			ret = watchdog_keepalive();
> +			if (ret)
> +				pr_warn("%s: no keep alive\n", __func__);
> +
> +			/* Don't allow any more keep-alives */
> +			watchdog_device.shutdown_flag = true;
> +		}
> +	}
> +	return NOTIFY_DONE;
> +}
> +
> +
> +/* Kernel Interfaces */
> +static const struct file_operations intel_scu_fops = {
> +	.owner          = THIS_MODULE,
> +	.llseek         = no_llseek,
> +	.write          = intel_scu_write,
> +	.unlocked_ioctl = intel_scu_ioctl,
> +#ifdef CONFIG_COMPAT
> +	.compat_ioctl	= intel_scu_ioctl,
> +#endif
> +	.open           = intel_scu_open,
> +	.release        = intel_scu_release,
> +};
> +
> +static int handle_mrfl_dev_ioapic(int irq)
> +{
> +	int ioapic;
> +	struct io_apic_irq_attr irq_attr;
> +
> +	ioapic = mp_find_ioapic(irq);
> +	if (ioapic >= 0) {
> +		irq_attr.ioapic = ioapic;
> +		irq_attr.ioapic_pin = irq;
> +		irq_attr.trigger = 1;
> +		irq_attr.polarity = 0; /* Active high */
> +		io_apic_set_pci_routing(NULL, irq, &irq_attr);
> +	} else {
> +		pr_err("cannot find interrupt %d in ioapic\n", irq);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +/* Init code */
> +static int __init intel_scu_watchdog_init(void)
> +{
> +	int ret = 0;
> +
> +	/*
> +	 *  This is only valid for Merrifield based platforms
> +	 */
> +	if (intel_mid_identify_cpu() != INTEL_MID_CPU_CHIP_TANGIER)
> +		return -ENODEV;
> +
> +	watchdog_device.normal_wd_action   = SCU_COLD_RESET_ON_TIMEOUT;
> +	watchdog_device.reboot_wd_action   = SCU_COLD_RESET_ON_TIMEOUT;
> +	watchdog_device.shutdown_wd_action = SCU_COLD_OFF_ON_TIMEOUT;
> +
> +	/* Initially, we are not in shutdown mode */
> +	watchdog_device.shutdown_flag = false;
> +
> +	/* Check timeouts boot parameter */
> +	if (check_timeouts(pre_timeout, timeout)) {
> +		pr_err("%s: Invalid timeouts\n", __func__);
> +		return -EINVAL;
> +	}
> +
> +	/* Reboot notifier */
> +	watchdog_device.reboot_notifier.notifier_call = reboot_notifier;
> +	watchdog_device.reboot_notifier.priority = 1;
> +	ret = register_reboot_notifier(&watchdog_device.reboot_notifier);
> +	if (ret) {
> +		pr_crit("cannot register reboot notifier %d\n", ret);
> +		goto error_stop_timer;
> +	}
> +
> +	/* Do not publish the watchdog device when disabled */
> +	if (!disable_kernel_watchdog) {
> +		watchdog_device.miscdev.minor = WATCHDOG_MINOR;
> +		watchdog_device.miscdev.name = "watchdog";
> +		watchdog_device.miscdev.fops = &intel_scu_fops;
> +
> +		ret = misc_register(&watchdog_device.miscdev);
> +		if (ret) {
> +			pr_crit("Cannot register miscdev %d err =%d\n",
> +				WATCHDOG_MINOR, ret);
> +			goto error_reboot_notifier;
> +		}
> +	}
> +
> +	/* MSI #15 handler to dump registers */
> +	handle_mrfl_dev_ioapic(EXT_TIMER0_MSI);
> +	ret = request_irq((unsigned int)EXT_TIMER0_MSI,
> +		watchdog_warning_interrupt,
> +		IRQF_SHARED|IRQF_NO_SUSPEND, "watchdog",
> +		&watchdog_device);
> +	if (ret) {
> +		pr_err("error requesting warning irq %d\n",
> +		       EXT_TIMER0_MSI);
> +		pr_err("error value returned is %d\n", ret);
> +		goto error_misc_register;
> +	}
> +
> +	if (disable_kernel_watchdog) {
> +		pr_info("%s: Disable kernel watchdog\n", __func__);
> +
> +		/* Make sure timer is stopped */
> +		ret = watchdog_stop();
> +		if (ret != 0)
> +			pr_warn("can't disable timer\n");
> +	}
> +
> +
> +	watchdog_device.started = false;
> +
> +	return ret;
> +
> +error_misc_register:
> +	misc_deregister(&watchdog_device.miscdev);
> +
> +error_reboot_notifier:
> +	unregister_reboot_notifier(&watchdog_device.reboot_notifier);
> +
> +error_stop_timer:
> +	watchdog_stop();
> +
> +	return ret;
> +}
> +
> +static void __exit intel_scu_watchdog_exit(void)
> +{
> +	int ret = 0;
> +
> +	ret = watchdog_stop();
> +	if (ret != 0)
> +		pr_err("cant disable timer\n");
> +
> +	misc_deregister(&watchdog_device.miscdev);
> +	unregister_reboot_notifier(&watchdog_device.reboot_notifier);
> +}
> +
> +#ifdef MODULE
> +module_init(intel_scu_watchdog_init);
> +#else
> +rootfs_initcall(intel_scu_watchdog_init);
> +#endif
> +module_exit(intel_scu_watchdog_exit);
> +
> +MODULE_AUTHOR("Intel Corporation");
> +MODULE_AUTHOR("Gabriel Touzeau <gabrielx.touzeau@...el.com>");
> +MODULE_AUTHOR("Jeremy Compostella <jeremy.compostella@...el.com");
> +MODULE_AUTHOR("Eric Ernst <eric.ernst@...ux.intel.com>");
> +MODULE_DESCRIPTION("Intel SCU Watchdog Device Driver for Merrifield platform");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
> +MODULE_VERSION(WDT_VER);
> diff --git a/drivers/watchdog/intel_scu_watchdog_evo.h b/drivers/watchdog/intel_scu_watchdog_evo.h
> new file mode 100644
> index 000000000000..d53c568f65a5
> --- /dev/null
> +++ b/drivers/watchdog/intel_scu_watchdog_evo.h
> @@ -0,0 +1,54 @@
> +/*
> + *      Intel_SCU 0.3:  An Intel SCU IOH Based Watchdog Device
> + *			for Intel's Tangier SoC / Merrifield platform
> + *
> + *      Copyright (C) 2009-2013 Intel Corporation. All rights reserved.
> + *
> + *      This program is free software; you can redistribute it and/or
> + *      modify it under the terms of version 2 of the GNU General
> + *      Public License as published by the Free Software Foundation.
> + *
> + *      This program is distributed in the hope that it will be
> + *      useful, but WITHOUT ANY WARRANTY; without even the implied
> + *      warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
> + *      PURPOSE.  See the GNU General Public License for more details.
> + *      You should have received a copy of the GNU General Public
> + *      License along with this program; if not, write to the Free
> + *      Software Foundation, Inc., 59 Temple Place - Suite 330,
> + *      Boston, MA  02111-1307, USA.
> + *      The full GNU General Public License is included in this
> + *      distribution in the file called COPYING.
> + *
> + */
> +
> +#ifndef __INTEL_SCU_WATCHDOG_H
> +#define __INTEL_SCU_WATCHDOG_H
> +
> +#include <linux/miscdevice.h>
> +#include <linux/types.h>
> +#include <linux/notifier.h>
> +
> +#ifdef CONFIG_COMPAT
> +#include <linux/compat.h>
> +#endif
> +
> +#define PFX "intel_scu_watchdog: "
> +#define WDT_VER "0.3"
> +
> +#define DEFAULT_PRETIMEOUT 75
> +#define DEFAULT_TIMEOUT 90
> +
> +struct intel_scu_watchdog_dev {
> +	ulong driver_open;
> +	ulong driver_closed;
> +	bool started;
> +	struct notifier_block reboot_notifier;
> +	struct miscdevice miscdev;
> +	bool shutdown_flag;
> +	int reset_type;
> +	int normal_wd_action;
> +	int reboot_wd_action;
> +	int shutdown_wd_action;
> +};
> +
> +#endif /* __INTEL_SCU_WATCHDOG_H */
>

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