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/*
* Copyright (C) ST-Ericsson SA 2010
*
* ST-Ericsson B2R2 node splitter
*
* Author: Fredrik Allansson <fredrik.allansson@stericsson.com>
* for ST-Ericsson.
*
* License terms: GNU General Public License (GPL), version 2.
*/
#ifndef __B2R2_NODE_SPLIT_H_
#define __B2R2_NODE_SPLIT_H_
#include "b2r2_internal.h"
#include "b2r2_hw.h"
/**
* b2r2_node_split_analyze() - Analyzes a B2R2 request
*
* @req - The request to analyze
* @max_buf_size - The largest size allowed for intermediate buffers
* @node_count - Number of nodes required for the job
* @buf_count - Number of intermediate buffers required for the job
* @bufs - An array of buffers needed for intermediate buffers
*
* Analyzes the request and determines how many nodes and intermediate buffers
* are required.
*
* It is the responsibility of the caller to allocate memory and assign the
* physical addresses. After that b2r2_node_split_assign_buffers should be
* called to assign the buffers to the right nodes.
*
* Returns:
* A handle identifing the analyzed request if successful, a negative
* value otherwise.
*/
int b2r2_node_split_analyze(const struct b2r2_blt_request *req, u32 max_buf_size,
u32 *node_count, struct b2r2_work_buf **bufs, u32* buf_count,
struct b2r2_node_split_job *job);
/**
* b2r2_node_split_configure() - Performs a node split
*
* @handle - A handle for the analyzed request
* @first - The first node in the list of nodes to use
*
* Fills the supplied list of nodes with the parameters acquired by analyzing
* the request.
*
* All pointers to intermediate buffers are represented by integers to be used
* in the array returned by b2r2_node_split_analyze.
*
* Returns:
* A negative value if an error occurred, 0 otherwise.
*/
int b2r2_node_split_configure(struct b2r2_control *cont,
struct b2r2_node_split_job *job, struct b2r2_node *first);
/**
* b2r2_node_split_assign_buffers() - Assignes physical addresses
*
* @handle - The handle for the job
* @first - The first node in the node list
* @bufs - Buffers with assigned physical addresses
* @buf_count - Number of physical addresses
*
* Assigns the physical addresses where intermediate buffers are required in
* the node list.
*
* The order of the elements of 'bufs' must be maintained from the call to
* b2r2_node_split_analyze.
*
* Returns:
* A negative value if an error occurred, 0 otherwise.
*/
int b2r2_node_split_assign_buffers(struct b2r2_control *cont,
struct b2r2_node_split_job *job,
struct b2r2_node *first, struct b2r2_work_buf *bufs,
u32 buf_count);
/**
* b2r2_node_split_unassign_buffers() - Removes all physical addresses
*
* @handle - The handle associated with the job
* @first - The first node in the node list
*
* Removes all references to intermediate buffers from the node list.
*
* This makes it possible to reuse the node list with new buffers by calling
* b2r2_node_split_assign_buffers again. Useful for caching node lists.
*/
void b2r2_node_split_unassign_buffers(struct b2r2_control *cont,
struct b2r2_node_split_job *job,
struct b2r2_node *first);
/**
* b2r2_node_split_release() - Releases all resources for a job
*
* @handle - The handle identifying the job. This will be set to 0.
*
* Releases all resources associated with a job.
*
* This should always be called once b2r2_node_split_analyze has been called
* in order to release any resources allocated while analyzing.
*/
void b2r2_node_split_cancel(struct b2r2_control *cont,
struct b2r2_node_split_job *job);
/**
* b2r2_node_split_init() - Initializes the node split module
*
* Initializes the node split module and creates debugfs files.
*/
int b2r2_node_split_init(struct b2r2_control *cont);
/**
* b2r2_node_split_exit() - Deinitializes the node split module
*
* Releases all resources for the node split module.
*/
void b2r2_node_split_exit(struct b2r2_control *cont);
#endif
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