drivers/scsi/isci/core/sci_util.h

/*
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2011 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * BSD LICENSE
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *   * Neither the name of Intel Corporation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _SCI_UTIL_H_
#define _SCI_UTIL_H_

#include <linux/string.h>

/**
 * SCIC_SWAP_DWORD() -
 *
 * Normal byte swap macro
 */
#define SCIC_SWAP_DWORD(x) \
	(\
		(((x) >> 24) & 0x000000FF) \
		| (((x) >>  8) & 0x0000FF00) \
		| (((x) <<  8) & 0x00FF0000) \
		| (((x) << 24) & 0xFF000000) \
	)

#define SCIC_BUILD_DWORD(char_buffer) \
	(\
		((char_buffer)[0] << 24) \
		| ((char_buffer)[1] << 16) \
		| ((char_buffer)[2] <<  8) \
		| ((char_buffer)[3]) \
	)

#define SCI_FIELD_OFFSET(type, field)   ((unsigned long)&(((type *)0)->field))


#define sci_cb_make_physical_address(physical_addr, addr_upper, addr_lower) \
	((physical_addr) = (addr_lower) | ((u64)addr_upper) << 32)


/**
 * sci_physical_address_add() -
 *
 * This macro simply performs addition on an dma_addr_t type.  The
 * lower u32 value is "clipped" or "wrapped" back through 0.  When this occurs
 * the upper 32-bits are incremented by 1.
 */
#define sci_physical_address_add(physical_address, value) \
	{ \
		u32 lower = lower_32_bits((physical_address)); \
		u32 upper = upper_32_bits((physical_address)); \
 \
		if (lower + (value) < lower) \
			upper += 1; \
 \
		lower += (value); \
		sci_cb_make_physical_address(physical_address, upper, lower); \
	}

/**
 * sci_physical_address_subtract() -
 *
 * This macro simply performs subtraction on an dma_addr_t type.  The
 * lower u32 value is "clipped" or "wrapped" back through 0.  When this occurs
 * the upper 32-bits are decremented by 1.
 */
#define sci_physical_address_subtract(physical_address, value) \
	{ \
		u32 lower = lower_32_bits((physical_address)); \
		u32 upper = upper_32_bits((physical_address)); \
 \
		if (lower - (value) > lower) \
			upper -= 1; \
 \
		lower -= (value); \
		sci_cb_make_physical_address(physical_address, upper, lower); \
	}

/**
 * scic_word_copy_with_swap() - Copy the data from source to destination and
 *    swap the bytes during the copy.
 * @destination: This parameter specifies the destination address to which the
 *    data is to be copied.
 * @source: This parameter specifies the source address from which data is to
 *    be copied.
 * @word_count: This parameter specifies the number of 32-bit words to copy and
 *    byte swap.
 *
 */
void scic_word_copy_with_swap(
	u32 *destination,
	u32 *source,
	u32 word_count);

#endif /* _SCI_UTIL_H_ */