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/**
* @file me8254.h
*
* @brief 8254 counter implementation.
* @note Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
* @author Guenter Gebhardt
*/
/*
* Copyright (C) 2007 Meilhaus Electronic GmbH (support@meilhaus.de)
*
* This file 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.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef _ME8254_H_
#define _ME8254_H_
#include "mesubdevice.h"
#include "meslock.h"
#ifdef __KERNEL__
/**
* @brief The 8254 subdevice class.
*/
typedef struct me8254_subdevice {
/* Inheritance */
me_subdevice_t base; /**< The subdevice base class. */
/* Attributes */
spinlock_t subdevice_lock; /**< Spin lock to protect the subdevice from concurrent access. */
spinlock_t *ctrl_reg_lock; /**< Spin lock to protect the control register from concurrent access. */
spinlock_t *clk_src_reg_lock; /**< Spin lock to protect the clock source register from concurrent access. */
uint32_t device_id; /**< The Meilhaus device type carrying the 8254 chip. */
int me8254_idx; /**< The index of the 8254 chip on the device. */
int ctr_idx; /**< The index of the counter on the 8254 chip. */
int caps; /**< Holds the device capabilities. */
unsigned long val_reg; /**< Holds the actual counter value. */
unsigned long ctrl_reg; /**< Register to configure the 8254 modes. */
unsigned long clk_src_reg; /**< Register to configure the counter connections. */
} me8254_subdevice_t;
/**
* @brief The constructor to generate a 8254 instance.
*
* @param device_id The kind of Meilhaus device holding the 8254.
* @param reg_base The register base address of the device as returned by the PCI BIOS.
* @param me8254_idx The index of the 8254 chip on the Meilhaus device.
* @param ctr_idx The index of the counter inside a 8254 chip.
* @param ctrl_reg_lock Pointer to spin lock protecting the 8254 control register from concurrent access.
* @param clk_src_reg_lock Pointer to spin lock protecting the clock source register from concurrent access.
*
* @return Pointer to new instance on success.\n
* NULL on error.
*/
me8254_subdevice_t *me8254_constructor(uint32_t device_id,
uint32_t reg_base,
unsigned int me8254_idx,
unsigned int ctr_idx,
spinlock_t * ctrl_reg_lock,
spinlock_t * clk_src_reg_lock);
#endif
#endif
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