// SPDX-License-Identifier: GPL-2.0-only
/*
 * drivers/media/platform/samsung/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/
 */

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

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

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;
}