linux/drivers/staging/media/atomisp/pci/sh_css_mipi.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Support for Intel Camera Imaging ISP subsystem.
 * Copyright (c) 2015, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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.
 */

#include "ia_css_mipi.h"
#include "sh_css_mipi.h"
#include <type_support.h>
#include "system_global.h"
#include "ia_css_err.h"
#include "ia_css_pipe.h"
#include "ia_css_stream_format.h"
#include "sh_css_stream_format.h"
#include "ia_css_stream_public.h"
#include "ia_css_frame_public.h"
#include "ia_css_input_port.h"
#include "ia_css_debug.h"
#include "sh_css_struct.h"
#include "sh_css_defs.h"
#include "sh_css_sp.h" /* sh_css_update_host2sp_mipi_frame sh_css_update_host2sp_num_mipi_frames ... */
#include "sw_event_global.h" /* IA_CSS_PSYS_SW_EVENT_MIPI_BUFFERS_READY */

static u32
ref_count_mipi_allocation[N_CSI_PORTS]; /* Initialized in mipi_init */

/* Assumptions:
 *	- A line is multiple of 4 bytes = 1 word.
 *	- Each frame has SOF and EOF (each 1 word).
 *	- Each line has format header and optionally SOL and EOL (each 1 word).
 *	- Odd and even lines of YUV420 format are different in bites per pixel size.
 *	- Custom size of embedded data.
 *  -- Interleaved frames are not taken into account.
 *  -- Lines are multiples of 8B, and not necessary of (custom 3B, or 7B
 *  etc.).
 * Result is given in DDR mem words, 32B or 256 bits
 */
int
ia_css_mipi_frame_calculate_size(const unsigned int width,
				 const unsigned int height,
				 const enum atomisp_input_format format,
				 const bool hasSOLandEOL,
				 const unsigned int embedded_data_size_words,
				 unsigned int *size_mem_words)
{ … }

void
mipi_init(void)
{ … }

bool mipi_is_free(void)
{ … }

/*
 * @brief Calculate the required MIPI buffer sizes.
 * Based on the stream configuration, calculate the
 * required MIPI buffer sizes (in DDR words).
 *
 * @param[in]   stream_cfg              Point to the target stream configuration
 * @param[out]  size_mem_words  MIPI buffer size in DDR words.
 *
 * @return
 */
static int calculate_mipi_buff_size(struct ia_css_stream_config *stream_cfg,
				    unsigned int *size_mem_words)
{ … }

int
allocate_mipi_frames(struct ia_css_pipe *pipe,
		     struct ia_css_stream_info *info)
{ … }

int
free_mipi_frames(struct ia_css_pipe *pipe)
{ … }

int
send_mipi_frames(struct ia_css_pipe *pipe)
{ … }