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/*
* RAR Handler (/dev/memrar) internal driver API.
* Copyright (C) 2010 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 _MEMRAR_H
#define _MEMRAR_H
#include <linux/ioctl.h>
#include <linux/types.h>
/**
* struct RAR_stat - RAR statistics structure
* @type: Type of RAR memory (e.g., audio vs. video)
* @capacity: Total size of RAR memory region.
* @largest_block_size: Size of the largest reservable block.
*
* This structure is used for RAR_HANDLER_STAT ioctl and for the
* RAR_get_stat() user space wrapper function.
*/
struct RAR_stat {
__u32 type;
__u32 capacity;
__u32 largest_block_size;
};
/**
* struct RAR_block_info - user space struct that describes RAR buffer
* @type: Type of RAR memory (e.g., audio vs. video)
* @size: Requested size of a block to be reserved in RAR.
* @handle: Handle that can be used to refer to reserved block.
*
* This is the basic structure exposed to the user space that
* describes a given RAR buffer. The buffer's underlying bus address
* is not exposed to the user. User space code refers to the buffer
* entirely by "handle".
*/
struct RAR_block_info {
__u32 type;
__u32 size;
__u32 handle;
};
#define RAR_IOCTL_BASE 0xE0
/* Reserve RAR block. */
#define RAR_HANDLER_RESERVE _IOWR(RAR_IOCTL_BASE, 0x00, struct RAR_block_info)
/* Release previously reserved RAR block. */
#define RAR_HANDLER_RELEASE _IOW(RAR_IOCTL_BASE, 0x01, __u32)
/* Get RAR stats. */
#define RAR_HANDLER_STAT _IOWR(RAR_IOCTL_BASE, 0x02, struct RAR_stat)
#ifdef __KERNEL__
/* -------------------------------------------------------------- */
/* Kernel Side RAR Handler Interface */
/* -------------------------------------------------------------- */
/**
* struct RAR_buffer - kernel space struct that describes RAR buffer
* @info: structure containing base RAR buffer information
* @bus_address: buffer bus address
*
* Structure that contains all information related to a given block of
* memory in RAR. It is generally only used when retrieving RAR
* related bus addresses.
*
* Note: This structure is used only by RAR-enabled drivers, and is
* not intended to be exposed to the user space.
*/
struct RAR_buffer {
struct RAR_block_info info;
dma_addr_t bus_address;
};
#if defined(CONFIG_MRST_RAR_HANDLER)
/**
* rar_reserve() - reserve RAR buffers
* @buffers: array of RAR_buffers where type and size of buffers to
* reserve are passed in, handle and bus address are
* passed out
* @count: number of RAR_buffers in the "buffers" array
*
* This function will reserve buffers in the restricted access regions
* of given types.
*
* It returns the number of successfully reserved buffers. Successful
* buffer reservations will have the corresponding bus_address field
* set to a non-zero value in the given buffers vector.
*/
extern size_t rar_reserve(struct RAR_buffer *buffers,
size_t count);
/**
* rar_release() - release RAR buffers
* @buffers: array of RAR_buffers where handles to buffers to be
* released are passed in
* @count: number of RAR_buffers in the "buffers" array
*
* This function will release RAR buffers that were retrieved through
* a call to rar_reserve() or rar_handle_to_bus() by decrementing the
* reference count. The RAR buffer will be reclaimed when the
* reference count drops to zero.
*
* It returns the number of successfully released buffers. Successful
* releases will have their handle field set to zero in the given
* buffers vector.
*/
extern size_t rar_release(struct RAR_buffer *buffers,
size_t count);
/**
* rar_handle_to_bus() - convert a vector of RAR handles to bus addresses
* @buffers: array of RAR_buffers containing handles to be
* converted to bus_addresses
* @count: number of RAR_buffers in the "buffers" array
* This function will retrieve the RAR buffer bus addresses, type and
* size corresponding to the RAR handles provided in the buffers
* vector.
*
* It returns the number of successfully converted buffers. The bus
* address will be set to 0 for unrecognized handles.
*
* The reference count for each corresponding buffer in RAR will be
* incremented. Call rar_release() when done with the buffers.
*/
extern size_t rar_handle_to_bus(struct RAR_buffer *buffers,
size_t count);
#else
extern inline size_t rar_reserve(struct RAR_buffer *buffers, size_t count)
{
return 0;
}
extern inline size_t rar_release(struct RAR_buffer *buffers, size_t count)
{
return 0;
}
extern inline size_t rar_handle_to_bus(struct RAR_buffer *buffers,
size_t count)
{
return 0;
}
#endif /* MRST_RAR_HANDLER */
#endif /* __KERNEL__ */
#endif /* _MEMRAR_H */
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