/*
 * drivers/media/platform/s5p-mfc/s5p_mfc_opr.c
 *
 * Samsung MFC (Multi Function Codec - FIMV) driver
 * This file contains hw related functions.
 *
 * Kamil Debski, Copyright (c) 2012 Samsung Electronics Co., Ltd.
 * http://www.samsung.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include "s5p_mfc_debug.h"
#include "s5p_mfc_opr.h"
#include "s5p_mfc_opr_v5.h"
#include "s5p_mfc_opr_v6.h"

static struct s5p_mfc_hw_ops *s5p_mfc_ops;

void s5p_mfc_init_hw_ops(struct s5p_mfc_dev *dev)
{
	if (IS_MFCV6_PLUS(dev)) {
		s5p_mfc_ops = s5p_mfc_init_hw_ops_v6();
		dev->warn_start = S5P_FIMV_ERR_WARNINGS_START_V6;
	} else {
		s5p_mfc_ops = s5p_mfc_init_hw_ops_v5();
		dev->warn_start = S5P_FIMV_ERR_WARNINGS_START;
	}
	dev->mfc_ops = s5p_mfc_ops;
}

void s5p_mfc_init_regs(struct s5p_mfc_dev *dev)
{
	if (IS_MFCV6_PLUS(dev))
		dev->mfc_regs = s5p_mfc_init_regs_v6_plus(dev);
}

int s5p_mfc_alloc_priv_buf(struct s5p_mfc_dev *dev, unsigned int mem_ctx,
			   struct s5p_mfc_priv_buf *b)
{
	unsigned int bits = dev->mem_size >> PAGE_SHIFT;
	unsigned int count = b->size >> PAGE_SHIFT;
	unsigned int align = (SZ_64K >> PAGE_SHIFT) - 1;
	unsigned int start, offset;

	mfc_debug(3, "Allocating priv: %zu\n", b->size);

	if (dev->mem_virt) {
		start = bitmap_find_next_zero_area(dev->mem_bitmap, bits, 0, count, align);
		if (start > bits)
			goto no_mem;

		bitmap_set(dev->mem_bitmap, start, count);
		offset = start << PAGE_SHIFT;
		b->virt = dev->mem_virt + offset;
		b->dma = dev->mem_base + offset;
	} else {
		struct device *mem_dev = dev->mem_dev[mem_ctx];
		dma_addr_t base = dev->dma_base[mem_ctx];

		b->ctx = mem_ctx;
		b->virt = dma_alloc_coherent(mem_dev, b->size, &b->dma, GFP_KERNEL);
		if (!b->virt)
			goto no_mem;
		if (b->dma < base) {
			mfc_err("Invalid memory configuration - buffer (%pad) is below base memory address(%pad)\n",
				&b->dma, &base);
			dma_free_coherent(mem_dev, b->size, b->virt, b->dma);
			return -ENOMEM;
		}
	}

	mfc_debug(3, "Allocated addr %p %pad\n", b->virt, &b->dma);
	return 0;
no_mem:
	mfc_err("Allocating private buffer of size %zu failed\n", b->size);
	return -ENOMEM;
}

int s5p_mfc_alloc_generic_buf(struct s5p_mfc_dev *dev, unsigned int mem_ctx,
			   struct s5p_mfc_priv_buf *b)
{
	struct device *mem_dev = dev->mem_dev[mem_ctx];

	mfc_debug(3, "Allocating generic buf: %zu\n", b->size);

	b->ctx = mem_ctx;
	b->virt = dma_alloc_coherent(mem_dev, b->size, &b->dma, GFP_KERNEL);
	if (!b->virt)
		goto no_mem;

	mfc_debug(3, "Allocated addr %p %pad\n", b->virt, &b->dma);
	return 0;
no_mem:
	mfc_err("Allocating generic buffer of size %zu failed\n", b->size);
	return -ENOMEM;
}

void s5p_mfc_release_priv_buf(struct s5p_mfc_dev *dev,
			      struct s5p_mfc_priv_buf *b)
{
	if (dev->mem_virt) {
		unsigned int start = (b->dma - dev->mem_base) >> PAGE_SHIFT;
		unsigned int count = b->size >> PAGE_SHIFT;

		bitmap_clear(dev->mem_bitmap, start, count);
	} else {
		struct device *mem_dev = dev->mem_dev[b->ctx];

		dma_free_coherent(mem_dev, b->size, b->virt, b->dma);
	}
	b->virt = NULL;
	b->dma = 0;
	b->size = 0;
}

void s5p_mfc_release_generic_buf(struct s5p_mfc_dev *dev,
			      struct s5p_mfc_priv_buf *b)
{
	struct device *mem_dev = dev->mem_dev[b->ctx];
	dma_free_coherent(mem_dev, b->size, b->virt, b->dma);
	b->virt = NULL;
	b->dma = 0;
	b->size = 0;
}