litmus-rt-tegra.git - LITMUS^RT and MC^2 V0 support for the NVIDIA Tegra 3 SoC

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/*
 *	Watchdog for the 7101 PMU version found in the ALi M1535 chipsets
 *
 *	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.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/ioport.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/pci.h>
#include <linux/uaccess.h>
#include <linux/io.h>

#define WATCHDOG_NAME "ALi_M1535"
#define PFX WATCHDOG_NAME ": "
#define WATCHDOG_TIMEOUT 60	/* 60 sec default timeout */

/* internal variables */
static unsigned long ali_is_open;
static char ali_expect_release;
static struct pci_dev *ali_pci;
static u32 ali_timeout_bits;		/* stores the computed timeout */
static DEFINE_SPINLOCK(ali_lock);	/* Guards the hardware */

/* module parameters */
static int timeout = WATCHDOG_TIMEOUT;
module_param(timeout, int, 0);
MODULE_PARM_DESC(timeout,
		"Watchdog timeout in seconds. (0 < timeout < 18000, default="
				__MODULE_STRING(WATCHDOG_TIMEOUT) ")");

static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout,
		"Watchdog cannot be stopped once started (default="
				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

/*
 *	ali_start	-	start watchdog countdown
 *
 *	Starts the timer running providing the timer has a counter
 *	configuration set.
 */

static void ali_start(void)
{
	u32 val;

	spin_lock(&ali_lock);

	pci_read_config_dword(ali_pci, 0xCC, &val);
	val &= ~0x3F;	/* Mask count */
	val |= (1 << 25) | ali_timeout_bits;
	pci_write_config_dword(ali_pci, 0xCC, val);

	spin_unlock(&ali_lock);
}

/*
 *	ali_stop	-	stop the timer countdown
 *
 *	Stop the ALi watchdog countdown
 */


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