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/*
* 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_MEMORY_DESCRIPTOR_LIST_H_
#define _SCI_MEMORY_DESCRIPTOR_LIST_H_
/**
* This file contains all of the basic data types utilized by an SCI user or
* implementor.
*
*
*/
#include "sci_types.h"
struct sci_base_memory_descriptor_list;
/**
*
*
* SCI_MDE_ATTRIBUTES These constants depict memory attributes for the Memory
* Descriptor Entries (MDEs) contained in the MDL.
*/
#define SCI_MDE_ATTRIBUTE_CACHEABLE 0x0001
#define SCI_MDE_ATTRIBUTE_PHYSICALLY_CONTIGUOUS 0x0002
/**
* struct sci_physical_memory_descriptor - This structure defines a description
* of a memory location for the SCI implementation.
*
*
*/
struct sci_physical_memory_descriptor {
/**
* This field contains the virtual address associated with this descriptor
* element. This field shall be zero when the descriptor is retrieved from
* the SCI implementation. The user shall set this field prior
* sci_controller_start()
*/
void *virtual_address;
/**
* This field contains the physical address associated with this desciptor
* element. This field shall be zero when the descriptor is retrieved from
* the SCI implementation. The user shall set this field prior
* sci_controller_start()
*/
dma_addr_t physical_address;
/**
* This field contains the size requirement for this memory descriptor.
* A value of zero for this field indicates the end of the descriptor
* list. The value should be treated as read only for an SCI user.
*/
u32 constant_memory_size;
/**
* This field contains the alignment requirement for this memory
* descriptor. A value of zero for this field indicates the end of the
* descriptor list. All other values indicate the number of bytes to
* achieve the necessary alignment. The value should be treated as
* read only for an SCI user.
*/
u32 constant_memory_alignment;
/**
* This field contains an indication regarding the desired memory
* attributes for this memory descriptor entry.
* Notes:
* - If the cacheable attribute is set, the user can allocate
* memory that is backed by cache for better performance. It
* is not required that the memory be backed by cache.
* - If the physically contiguous attribute is set, then the
* entire memory must be physically contiguous across all
* page boundaries.
*/
u16 constant_memory_attributes;
};
/**
* sci_mdl_first_entry() - This method simply rewinds the MDL iterator back to
* the first memory descriptor entry in the list.
* @mdl: This parameter specifies the memory descriptor list that is to be
* rewound.
*
*/
void sci_mdl_first_entry(
struct sci_base_memory_descriptor_list *mdl);
/**
* sci_mdl_next_entry() - This method simply updates the "current" pointer to
* the next sequential memory descriptor.
* @mdl: This parameter specifies the memory descriptor list for which to
* return the next memory descriptor entry in the list.
*
* none.
*/
void sci_mdl_next_entry(
struct sci_base_memory_descriptor_list *mdl);
/**
* sci_mdl_get_current_entry() - This method simply returns the current memory
* descriptor entry.
* @mdl: This parameter specifies the memory descriptor list for which to
* return the current memory descriptor entry.
*
* This method returns a pointer to the current physical memory descriptor in
* the MDL. NULL This value is returned if there are no descriptors in the list.
*/
struct sci_physical_memory_descriptor *sci_mdl_get_current_entry(
struct sci_base_memory_descriptor_list *mdl);
#endif /* _SCI_MEMORY_DESCRIPTOR_LIST_H_ */
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