drivers/staging/media/atomisp/pci/runtime/isys/src/isys_dma_rmgr.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Support for Intel Camera Imaging ISP subsystem.
 * Copyright (c) 2010 - 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 "system_global.h"

#ifdef ISP2401

#include "assert_support.h"
#include "platform_support.h"
#include "ia_css_isys.h"
#include "bitop_support.h"
#include "isys_dma_rmgr.h"

static isys_dma_rsrc_t isys_dma_rsrc[N_ISYS2401_DMA_ID];

void ia_css_isys_dma_channel_rmgr_init(void)
{
	memset(&isys_dma_rsrc, 0, sizeof(isys_dma_rsrc_t));
}

void ia_css_isys_dma_channel_rmgr_uninit(void)
{
	memset(&isys_dma_rsrc, 0, sizeof(isys_dma_rsrc_t));
}

bool ia_css_isys_dma_channel_rmgr_acquire(
    isys2401_dma_ID_t	dma_id,
    isys2401_dma_channel	*channel)
{
	bool retval = false;
	isys2401_dma_channel	i;
	isys2401_dma_channel	max_dma_channel;
	isys_dma_rsrc_t		*cur_rsrc = NULL;

	assert(dma_id < N_ISYS2401_DMA_ID);
	assert(channel);

	max_dma_channel = N_ISYS2401_DMA_CHANNEL_PROCS[dma_id];
	cur_rsrc = &isys_dma_rsrc[dma_id];

	if (cur_rsrc->num_active < max_dma_channel) {
		for (i = ISYS2401_DMA_CHANNEL_0; i < N_ISYS2401_DMA_CHANNEL; i++) {
			if (bitop_getbit(cur_rsrc->active_table, i) == 0) {
				bitop_setbit(cur_rsrc->active_table, i);
				*channel = i;
				cur_rsrc->num_active++;
				retval = true;
				break;
			}
		}
	}

	return retval;
}

void ia_css_isys_dma_channel_rmgr_release(
    isys2401_dma_ID_t	dma_id,
    isys2401_dma_channel	*channel)
{
	isys2401_dma_channel	max_dma_channel;
	isys_dma_rsrc_t		*cur_rsrc = NULL;

	assert(dma_id < N_ISYS2401_DMA_ID);
	assert(channel);

	max_dma_channel = N_ISYS2401_DMA_CHANNEL_PROCS[dma_id];
	cur_rsrc = &isys_dma_rsrc[dma_id];

	if ((*channel < max_dma_channel) && (cur_rsrc->num_active > 0)) {
		if (bitop_getbit(cur_rsrc->active_table, *channel) == 1) {
			bitop_clearbit(cur_rsrc->active_table, *channel);
			cur_rsrc->num_active--;
		}
	}
}
#endif