/*
 * VPDMA helper library
 *
 * Copyright (c) 2013 Texas Instruments Inc.
 *
 * David Griego, <dagriego@biglakesoftware.com>
 * Dale Farnsworth, <dale@farnsworth.org>
 * Archit Taneja, <archit@ti.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 <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/firmware.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/videodev2.h>

#include "vpdma.h"
#include "vpdma_priv.h"

#define VPDMA_FIRMWARE  "vpdma-1b8.bin"

const struct vpdma_data_format vpdma_yuv_fmts[] = {
        [VPDMA_DATA_FMT_Y444] = {
                .type           = VPDMA_DATA_FMT_TYPE_YUV,
                .data_type      = DATA_TYPE_Y444,
                .depth          = 8,
        },
        [VPDMA_DATA_FMT_Y422] = {
                .type           = VPDMA_DATA_FMT_TYPE_YUV,
                .data_type      = DATA_TYPE_Y422,
                .depth          = 8,
        },
        [VPDMA_DATA_FMT_Y420] = {
                .type           = VPDMA_DATA_FMT_TYPE_YUV,
                .data_type      = DATA_TYPE_Y420,
                .depth          = 8,
        },
        [VPDMA_DATA_FMT_C444] = {
                .type           = VPDMA_DATA_FMT_TYPE_YUV,
                .data_type      = DATA_TYPE_C444,
                .depth          = 8,
        },
        [VPDMA_DATA_FMT_C422] = {
                .type           = VPDMA_DATA_FMT_TYPE_YUV,
                .data_type      = DATA_TYPE_C422,
                .depth          = 8,
        },
        [VPDMA_DATA_FMT_C420] = {
                .type           = VPDMA_DATA_FMT_TYPE_YUV,
                .data_type      = DATA_TYPE_C420,
                .depth          = 4,
        },
        [VPDMA_DATA_FMT_YCR422] = {
                .type           = VPDMA_DATA_FMT_TYPE_YUV,
                .data_type      = DATA_TYPE_YCR422,
                .depth          = 16,
        },
        [VPDMA_DATA_FMT_YC444] = {
                .type           = VPDMA_DATA_FMT_TYPE_YUV,
                .data_type      = DATA_TYPE_YC444,
                .depth          = 24,
        },
        [VPDMA_DATA_FMT_CRY422] = {
                .type           = VPDMA_DATA_FMT_TYPE_YUV,
                .data_type      = DATA_TYPE_CRY422,
                .depth          = 16,
        },
        [VPDMA_DATA_FMT_CBY422] = {
                .type           = VPDMA_DATA_FMT_TYPE_YUV,
                .data_type      = DATA_TYPE_CBY422,
                .depth          = 16,
        },
        [VPDMA_DATA_FMT_YCB422] = {
                .type           = VPDMA_DATA_FMT_TYPE_YUV,
                .data_type      = DATA_TYPE_YCB422,
                .depth          = 16,
        },
};
EXPORT_SYMBOL(vpdma_yuv_fmts);

const struct vpdma_data_format vpdma_rgb_fmts[] = {
        [VPDMA_DATA_FMT_RGB565] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_RGB16_565,
                .depth          = 16,
        },
        [VPDMA_DATA_FMT_ARGB16_1555] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_ARGB_1555,
                .depth          = 16,
        },
        [VPDMA_DATA_FMT_ARGB16] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_ARGB_4444,
                .depth          = 16,
        },
        [VPDMA_DATA_FMT_RGBA16_5551] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_RGBA_5551,
                .depth          = 16,
        },
        [VPDMA_DATA_FMT_RGBA16] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_RGBA_4444,
                .depth          = 16,
        },
        [VPDMA_DATA_FMT_ARGB24] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_ARGB24_6666,
                .depth          = 24,
        },
        [VPDMA_DATA_FMT_RGB24] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_RGB24_888,
                .depth          = 24,
        },
        [VPDMA_DATA_FMT_ARGB32] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_ARGB32_8888,
                .depth          = 32,
        },
        [VPDMA_DATA_FMT_RGBA24] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_RGBA24_6666,
                .depth          = 24,
        },
        [VPDMA_DATA_FMT_RGBA32] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_RGBA32_8888,
                .depth          = 32,
        },
        [VPDMA_DATA_FMT_BGR565] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_BGR16_565,
                .depth          = 16,
        },
        [VPDMA_DATA_FMT_ABGR16_1555] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_ABGR_1555,
                .depth          = 16,
        },
        [VPDMA_DATA_FMT_ABGR16] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_ABGR_4444,
                .depth          = 16,
        },
        [VPDMA_DATA_FMT_BGRA16_5551] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_BGRA_5551,
                .depth          = 16,
        },
        [VPDMA_DATA_FMT_BGRA16] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_BGRA_4444,
                .depth          = 16,
        },
        [VPDMA_DATA_FMT_ABGR24] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_ABGR24_6666,
                .depth          = 24,
        },
        [VPDMA_DATA_FMT_BGR24] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_BGR24_888,
                .depth          = 24,
        },
        [VPDMA_DATA_FMT_ABGR32] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_ABGR32_8888,
                .depth          = 32,
        },
        [VPDMA_DATA_FMT_BGRA24] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_BGRA24_6666,
                .depth          = 24,
        },
        [VPDMA_DATA_FMT_BGRA32] = {
                .type           = VPDMA_DATA_FMT_TYPE_RGB,
                .data_type      = DATA_TYPE_BGRA32_8888,
                .depth          = 32,
        },
};
EXPORT_SYMBOL(vpdma_rgb_fmts);

/*
 * To handle RAW format we are re-using the CBY422
 * vpdma data type so that we use the vpdma to re-order
 * the incoming bytes, as the parser assumes that the
 * first byte presented on the bus is the MSB of a 2
 * bytes value.
 * RAW8 handles from 1 to 8 bits
 * RAW16 handles from 9 to 16 bits
 */
const struct vpdma_data_format vpdma_raw_fmts[] = {
        [VPDMA_DATA_FMT_RAW8] = {
                .type           = VPDMA_DATA_FMT_TYPE_YUV,
                .data_type      = DATA_TYPE_CBY422,
                .depth          = 8,
        },
        [VPDMA_DATA_FMT_RAW16] = {
                .type           = VPDMA_DATA_FMT_TYPE_YUV,
                .data_type      = DATA_TYPE_CBY422,
                .depth          = 16,
        },
};
EXPORT_SYMBOL(vpdma_raw_fmts);

const struct vpdma_data_format vpdma_misc_fmts[] = {
        [VPDMA_DATA_FMT_MV] = {
                .type           = VPDMA_DATA_FMT_TYPE_MISC,
                .data_type      = DATA_TYPE_MV,
                .depth          = 4,
        },
};
EXPORT_SYMBOL(vpdma_misc_fmts);

struct vpdma_channel_info {
        int num;                /* VPDMA channel number */
        int cstat_offset;       /* client CSTAT register offset */
};

static const struct vpdma_channel_info chan_info[] = {
        [VPE_CHAN_LUMA1_IN] = {
                .num            = VPE_CHAN_NUM_LUMA1_IN,
                .cstat_offset   = VPDMA_DEI_LUMA1_CSTAT,
        },
        [VPE_CHAN_CHROMA1_IN] = {
                .num            = VPE_CHAN_NUM_CHROMA1_IN,
                .cstat_offset   = VPDMA_DEI_CHROMA1_CSTAT,
        },
        [VPE_CHAN_LUMA2_IN] = {
                .num            = VPE_CHAN_NUM_LUMA2_IN,
                .cstat_offset   = VPDMA_DEI_LUMA2_CSTAT,
        },
        [VPE_CHAN_CHROMA2_IN] = {
                .num            = VPE_CHAN_NUM_CHROMA2_IN,
                .cstat_offset   = VPDMA_DEI_CHROMA2_CSTAT,
        },
        [VPE_CHAN_LUMA3_IN] = {
                .num            = VPE_CHAN_NUM_LUMA3_IN,
                .cstat_offset   = VPDMA_DEI_LUMA3_CSTAT,
        },
        [VPE_CHAN_CHROMA3_IN] = {
                .num            = VPE_CHAN_NUM_CHROMA3_IN,
                .cstat_offset   = VPDMA_DEI_CHROMA3_CSTAT,
        },
        [VPE_CHAN_MV_IN] = {
                .num            = VPE_CHAN_NUM_MV_IN,
                .cstat_offset   = VPDMA_DEI_MV_IN_CSTAT,
        },
        [VPE_CHAN_MV_OUT] = {
                .num            = VPE_CHAN_NUM_MV_OUT,
                .cstat_offset   = VPDMA_DEI_MV_OUT_CSTAT,
        },
        [VPE_CHAN_LUMA_OUT] = {
                .num            = VPE_CHAN_NUM_LUMA_OUT,
                .cstat_offset   = VPDMA_VIP_UP_Y_CSTAT,
        },
        [VPE_CHAN_CHROMA_OUT] = {
                .num            = VPE_CHAN_NUM_CHROMA_OUT,
                .cstat_offset   = VPDMA_VIP_UP_UV_CSTAT,
        },
        [VPE_CHAN_RGB_OUT] = {
                .num            = VPE_CHAN_NUM_RGB_OUT,
                .cstat_offset   = VPDMA_VIP_UP_Y_CSTAT,
        },
};

static u32 read_reg(struct vpdma_data *vpdma, int offset)
{
        return ioread32(vpdma->base + offset);
}

static void write_reg(struct vpdma_data *vpdma, int offset, u32 value)
{
        iowrite32(value, vpdma->base + offset);
}

static int read_field_reg(struct vpdma_data *vpdma, int offset,
                u32 mask, int shift)
{
        return (read_reg(vpdma, offset) & (mask << shift)) >> shift;
}

static void write_field_reg(struct vpdma_data *vpdma, int offset, u32 field,
                u32 mask, int shift)
{
        u32 val = read_reg(vpdma, offset);

        val &= ~(mask << shift);
        val |= (field & mask) << shift;

        write_reg(vpdma, offset, val);
}

void vpdma_dump_regs(struct vpdma_data *vpdma)
{
        struct device *dev = &vpdma->pdev->dev;

#define DUMPREG(r) dev_dbg(dev, "%-35s %08x\n", #r, read_reg(vpdma, VPDMA_##r))

        dev_dbg(dev, "VPDMA Registers:\n");

        DUMPREG(PID);
        DUMPREG(LIST_ADDR);
        DUMPREG(LIST_ATTR);
        DUMPREG(LIST_STAT_SYNC);
        DUMPREG(BG_RGB);
        DUMPREG(BG_YUV);
        DUMPREG(SETUP);
        DUMPREG(MAX_SIZE1);
        DUMPREG(MAX_SIZE2);
        DUMPREG(MAX_SIZE3);

        /*
         * dumping registers of only group0 and group3, because VPE channels
         * lie within group0 and group3 registers
         */
        DUMPREG(INT_CHAN_STAT(0));
        DUMPREG(INT_CHAN_MASK(0));
        DUMPREG(INT_CHAN_STAT(3));
        DUMPREG(INT_CHAN_MASK(3));
        DUMPREG(INT_CLIENT0_STAT);
        DUMPREG(INT_CLIENT0_MASK);
        DUMPREG(INT_CLIENT1_STAT);
        DUMPREG(INT_CLIENT1_MASK);
        DUMPREG(INT_LIST0_STAT);
        DUMPREG(INT_LIST0_MASK);

        /*
         * these are registers specific to VPE clients, we can make this
         * function dump client registers specific to VPE or VIP based on
         * who is using it
         */
        DUMPREG(DEI_CHROMA1_CSTAT);
        DUMPREG(DEI_LUMA1_CSTAT);
        DUMPREG(DEI_CHROMA2_CSTAT);
        DUMPREG(DEI_LUMA2_CSTAT);
        DUMPREG(DEI_CHROMA3_CSTAT);
        DUMPREG(DEI_LUMA3_CSTAT);
        DUMPREG(DEI_MV_IN_CSTAT);
        DUMPREG(DEI_MV_OUT_CSTAT);
        DUMPREG(VIP_UP_Y_CSTAT);
        DUMPREG(VIP_UP_UV_CSTAT);
        DUMPREG(VPI_CTL_CSTAT);
}
EXPORT_SYMBOL(vpdma_dump_regs);

/*
 * Allocate a DMA buffer
 */
int vpdma_alloc_desc_buf(struct vpdma_buf *buf, size_t size)
{
        buf->size = size;
        buf->mapped = false;
        buf->addr = kzalloc(size, GFP_KERNEL);
        if (!buf->addr)
                return -ENOMEM;

        WARN_ON(((unsigned long)buf->addr & VPDMA_DESC_ALIGN) != 0);

        return 0;
}
EXPORT_SYMBOL(vpdma_alloc_desc_buf);

void vpdma_free_desc_buf(struct vpdma_buf *buf)
{
        WARN_ON(buf->mapped);
        kfree(buf->addr);
        buf->addr = NULL;
        buf->size = 0;
}
EXPORT_SYMBOL(vpdma_free_desc_buf);

/*
 * map descriptor/payload DMA buffer, enabling DMA access
 */
int vpdma_map_desc_buf(struct vpdma_data *vpdma, struct vpdma_buf *buf)
{
        struct device *dev = &vpdma->pdev->dev;

        WARN_ON(buf->mapped);
        buf->dma_addr = dma_map_single(dev, buf->addr, buf->size,
                                DMA_BIDIRECTIONAL);
        if (dma_mapping_error(dev, buf->dma_addr)) {
                dev_err(dev, "failed to map buffer\n");
                return -EINVAL;
        }

        buf->mapped = true;

        return 0;
}
EXPORT_SYMBOL(vpdma_map_desc_buf);

/*
 * unmap descriptor/payload DMA buffer, disabling DMA access and
 * allowing the main processor to acces the data
 */
void vpdma_unmap_desc_buf(struct vpdma_data *vpdma, struct vpdma_buf *buf)
{
        struct device *dev = &vpdma->pdev->dev;

        if (buf->mapped)
                dma_unmap_single(dev, buf->dma_addr, buf->size,
                                DMA_BIDIRECTIONAL);

        buf->mapped = false;
}
EXPORT_SYMBOL(vpdma_unmap_desc_buf);

/*
 * Cleanup all pending descriptors of a list
 * First, stop the current list being processed.
 * If the VPDMA was busy, this step makes vpdma to accept post lists.
 * To cleanup the internal FSM, post abort list descriptor for all the
 * channels from @channels array of size @size.
 */
int vpdma_list_cleanup(struct vpdma_data *vpdma, int list_num,
                int *channels, int size)
{
        struct vpdma_desc_list abort_list;
        int i, ret, timeout = 500;

        write_reg(vpdma, VPDMA_LIST_ATTR,
                        (list_num << VPDMA_LIST_NUM_SHFT) |
                        (1 << VPDMA_LIST_STOP_SHFT));

        if (size <= 0 || !channels)
                return 0;

        ret = vpdma_create_desc_list(&abort_list,
                size * sizeof(struct vpdma_dtd), VPDMA_LIST_TYPE_NORMAL);
        if (ret)
                return ret;

        for (i = 0; i < size; i++)
                vpdma_add_abort_channel_ctd(&abort_list, channels[i]);

        ret = vpdma_map_desc_buf(vpdma, &abort_list.buf);
        if (ret)
                return ret;
        ret = vpdma_submit_descs(vpdma, &abort_list, list_num);
        if (ret)
                return ret;

        while (vpdma_list_busy(vpdma, list_num) && --timeout)
                ;

        if (timeout == 0) {
                dev_err(&vpdma->pdev->dev, "Timed out cleaning up VPDMA list\n");
                return -EBUSY;
        }

        vpdma_unmap_desc_buf(vpdma, &abort_list.buf);
        vpdma_free_desc_buf(&abort_list.buf);

        return 0;
}
EXPORT_SYMBOL(vpdma_list_cleanup);

/*
 * create a descriptor list, the user of this list will append configuration,
 * control and data descriptors to this list, this list will be submitted to
 * VPDMA. VPDMA's list parser will go through each descriptor and perform the
 * required DMA operations
 */
int vpdma_create_desc_list(struct vpdma_desc_list *list, size_t size, int type)
{
        int r;

        r = vpdma_alloc_desc_buf(&list->buf, size);
        if (r)
                return r;

        list->next = list->buf.addr;

        list->type = type;

        return 0;
}
EXPORT_SYMBOL(vpdma_create_desc_list);

/*
 * once a descriptor list is parsed by VPDMA, we reset the list by emptying it,
 * to allow new descriptors to be added to the list.
 */
void vpdma_reset_desc_list(struct vpdma_desc_list *list)
{
        list->next = list->buf.addr;
}
EXPORT_SYMBOL(vpdma_reset_desc_list);

/*
 * free the buffer allocated fot the VPDMA descriptor list, this should be
 * called when the user doesn't want to use VPDMA any more.
 */
void vpdma_free_desc_list(struct vpdma_desc_list *list)
{
        vpdma_free_desc_buf(&list->buf);

        list->next = NULL;
}
EXPORT_SYMBOL(vpdma_free_desc_list);

bool vpdma_list_busy(struct vpdma_data *vpdma, int list_num)
{
        return read_reg(vpdma, VPDMA_LIST_STAT_SYNC) & BIT(list_num + 16);
}
EXPORT_SYMBOL(vpdma_list_busy);

/*
 * submit a list of DMA descriptors to the VPE VPDMA, do not wait for completion
 */
int vpdma_submit_descs(struct vpdma_data *vpdma,
                        struct vpdma_desc_list *list, int list_num)
{
        int list_size;
        unsigned long flags;

        if (vpdma_list_busy(vpdma, list_num))
                return -EBUSY;

        /* 16-byte granularity */
        list_size = (list->next - list->buf.addr) >> 4;

        spin_lock_irqsave(&vpdma->lock, flags);
        write_reg(vpdma, VPDMA_LIST_ADDR, (u32) list->buf.dma_addr);

        write_reg(vpdma, VPDMA_LIST_ATTR,
                        (list_num << VPDMA_LIST_NUM_SHFT) |
                        (list->type << VPDMA_LIST_TYPE_SHFT) |
                        list_size);
        spin_unlock_irqrestore(&vpdma->lock, flags);

        return 0;
}
EXPORT_SYMBOL(vpdma_submit_descs);

static void dump_dtd(struct vpdma_dtd *dtd);

void vpdma_update_dma_addr(struct vpdma_data *vpdma,
        struct vpdma_desc_list *list, dma_addr_t dma_addr,
        void *write_dtd, int drop, int idx)
{
        struct vpdma_dtd *dtd = list->buf.addr;
        dma_addr_t write_desc_addr;
        int offset;

        dtd += idx;
        vpdma_unmap_desc_buf(vpdma, &list->buf);

        dtd->start_addr = dma_addr;

        /* Calculate write address from the offset of write_dtd from start
         * of the list->buf
         */
        offset = (void *)write_dtd - list->buf.addr;
        write_desc_addr = list->buf.dma_addr + offset;

        if (drop)
                dtd->desc_write_addr = dtd_desc_write_addr(write_desc_addr,
                                                           1, 1, 0);
        else
                dtd->desc_write_addr = dtd_desc_write_addr(write_desc_addr,
                                                           1, 0, 0);

        vpdma_map_desc_buf(vpdma, &list->buf);

        dump_dtd(dtd);
}
EXPORT_SYMBOL(vpdma_update_dma_addr);

void vpdma_set_max_size(struct vpdma_data *vpdma, int reg_addr,
                        u32 width, u32 height)
{
        if (reg_addr != VPDMA_MAX_SIZE1 && reg_addr != VPDMA_MAX_SIZE2 &&
            reg_addr != VPDMA_MAX_SIZE3)
                reg_addr = VPDMA_MAX_SIZE1;

        write_field_reg(vpdma, reg_addr, width - 1,
                        VPDMA_MAX_SIZE_WIDTH_MASK, VPDMA_MAX_SIZE_WIDTH_SHFT);

        write_field_reg(vpdma, reg_addr, height - 1,
                        VPDMA_MAX_SIZE_HEIGHT_MASK, VPDMA_MAX_SIZE_HEIGHT_SHFT);

}
EXPORT_SYMBOL(vpdma_set_max_size);

static void dump_cfd(struct vpdma_cfd *cfd)
{
        int class;

        class = cfd_get_class(cfd);

        pr_debug("config descriptor of payload class: %s\n",
                class == CFD_CLS_BLOCK ? "simple block" :
                "address data block");

        if (class == CFD_CLS_BLOCK)
                pr_debug("word0: dst_addr_offset = 0x%08x\n",
                        cfd->dest_addr_offset);

        if (class == CFD_CLS_BLOCK)
                pr_debug("word1: num_data_wrds = %d\n", cfd->block_len);

        pr_debug("word2: payload_addr = 0x%08x\n", cfd->payload_addr);

        pr_debug("word3: pkt_type = %d, direct = %d, class = %d, dest = %d, payload_len = %d\n",
                 cfd_get_pkt_type(cfd),
                 cfd_get_direct(cfd), class, cfd_get_dest(cfd),
                 cfd_get_payload_len(cfd));
}

/*
 * append a configuration descriptor to the given descriptor list, where the
 * payload is in the form of a simple data block specified in the descriptor
 * header, this is used to upload scaler coefficients to the scaler module
 */
void vpdma_add_cfd_block(struct vpdma_desc_list *list, int client,
                struct vpdma_buf *blk, u32 dest_offset)
{
        struct vpdma_cfd *cfd;
        int len = blk->size;

        WARN_ON(blk->dma_addr & VPDMA_DESC_ALIGN);

        cfd = list->next;
        WARN_ON((void *)(cfd + 1) > (list->buf.addr + list->buf.size));

        cfd->dest_addr_offset = dest_offset;
        cfd->block_len = len;
        cfd->payload_addr = (u32) blk->dma_addr;
        cfd->ctl_payload_len = cfd_pkt_payload_len(CFD_INDIRECT, CFD_CLS_BLOCK,
                                client, len >> 4);

        list->next = cfd + 1;

        dump_cfd(cfd);
}
EXPORT_SYMBOL(vpdma_add_cfd_block);

/*
 * append a configuration descriptor to the given descriptor list, where the
 * payload is in the address data block format, this is used to a configure a
 * discontiguous set of MMRs
 */
void vpdma_add_cfd_adb(struct vpdma_desc_list *list, int client,
                struct vpdma_buf *adb)
{
        struct vpdma_cfd *cfd;
        unsigned int len = adb->size;

        WARN_ON(len & VPDMA_ADB_SIZE_ALIGN);
        WARN_ON(adb->dma_addr & VPDMA_DESC_ALIGN);

        cfd = list->next;
        BUG_ON((void *)(cfd + 1) > (list->buf.addr + list->buf.size));

        cfd->w0 = 0;
        cfd->w1 = 0;
        cfd->payload_addr = (u32) adb->dma_addr;
        cfd->ctl_payload_len = cfd_pkt_payload_len(CFD_INDIRECT, CFD_CLS_ADB,
                                client, len >> 4);

        list->next = cfd + 1;

        dump_cfd(cfd);
};
EXPORT_SYMBOL(vpdma_add_cfd_adb);

/*
 * control descriptor format change based on what type of control descriptor it
 * is, we only use 'sync on channel' control descriptors for now, so assume it's
 * that
 */
static void dump_ctd(struct vpdma_ctd *ctd)
{
        pr_debug("control descriptor\n");

        pr_debug("word3: pkt_type = %d, source = %d, ctl_type = %d\n",
                ctd_get_pkt_type(ctd), ctd_get_source(ctd), ctd_get_ctl(ctd));
}

/*
 * append a 'sync on channel' type control descriptor to the given descriptor
 * list, this descriptor stalls the VPDMA list till the time DMA is completed
 * on the specified channel
 */
void vpdma_add_sync_on_channel_ctd(struct vpdma_desc_list *list,
                enum vpdma_channel chan)
{
        struct vpdma_ctd *ctd;

        ctd = list->next;
        WARN_ON((void *)(ctd + 1) > (list->buf.addr + list->buf.size));

        ctd->w0 = 0;
        ctd->w1 = 0;
        ctd->w2 = 0;
        ctd->type_source_ctl = ctd_type_source_ctl(chan_info[chan].num,
                                CTD_TYPE_SYNC_ON_CHANNEL);

        list->next = ctd + 1;

        dump_ctd(ctd);
}
EXPORT_SYMBOL(vpdma_add_sync_on_channel_ctd);

/*
 * append an 'abort_channel' type control descriptor to the given descriptor
 * list, this descriptor aborts any DMA transaction happening using the
 * specified channel
 */
void vpdma_add_abort_channel_ctd(struct vpdma_desc_list *list,
                int chan_num)
{
        struct vpdma_ctd *ctd;

        ctd = list->next;
        WARN_ON((void *)(ctd + 1) > (list->buf.addr + list->buf.size));

        ctd->w0 = 0;
        ctd->w1 = 0;
        ctd->w2 = 0;
        ctd->type_source_ctl = ctd_type_source_ctl(chan_num,
                                CTD_TYPE_ABORT_CHANNEL);

        list->next = ctd + 1;

        dump_ctd(ctd);
}
EXPORT_SYMBOL(vpdma_add_abort_channel_ctd);

static void dump_dtd(struct vpdma_dtd *dtd)
{
        int dir, chan;

        dir = dtd_get_dir(dtd);
        chan = dtd_get_chan(dtd);

        pr_debug("%s data transfer descriptor for channel %d\n",
                dir == DTD_DIR_OUT ? "outbound" : "inbound", chan);

        pr_debug("word0: data_type = %d, notify = %d, field = %d, 1D = %d, even_ln_skp = %d, odd_ln_skp = %d, line_stride = %d\n",
                dtd_get_data_type(dtd), dtd_get_notify(dtd), dtd_get_field(dtd),
                dtd_get_1d(dtd), dtd_get_even_line_skip(dtd),
                dtd_get_odd_line_skip(dtd), dtd_get_line_stride(dtd));

        if (dir == DTD_DIR_IN)
                pr_debug("word1: line_length = %d, xfer_height = %d\n",
                        dtd_get_line_length(dtd), dtd_get_xfer_height(dtd));

        pr_debug("word2: start_addr = %pad\n", &dtd->start_addr);

        pr_debug("word3: pkt_type = %d, mode = %d, dir = %d, chan = %d, pri = %d, next_chan = %d\n",
                 dtd_get_pkt_type(dtd),
                 dtd_get_mode(dtd), dir, chan, dtd_get_priority(dtd),
                 dtd_get_next_chan(dtd));

        if (dir == DTD_DIR_IN)
                pr_debug("word4: frame_width = %d, frame_height = %d\n",
                        dtd_get_frame_width(dtd), dtd_get_frame_height(dtd));
        else
                pr_debug("word4: desc_write_addr = 0x%08x, write_desc = %d, drp_data = %d, use_desc_reg = %d\n",
                        dtd_get_desc_write_addr(dtd), dtd_get_write_desc(dtd),
                        dtd_get_drop_data(dtd), dtd_get_use_desc(dtd));

        if (dir == DTD_DIR_IN)
                pr_debug("word5: hor_start = %d, ver_start = %d\n",
                        dtd_get_h_start(dtd), dtd_get_v_start(dtd));
        else
                pr_debug("word5: max_width %d, max_height %d\n",
                        dtd_get_max_width(dtd), dtd_get_max_height(dtd));

        pr_debug("word6: client specific attr0 = 0x%08x\n", dtd->client_attr0);
        pr_debug("word7: client specific attr1 = 0x%08x\n", dtd->client_attr1);
}

/*
 * append an outbound data transfer descriptor to the given descriptor list,
 * this sets up a 'client to memory' VPDMA transfer for the given VPDMA channel
 *
 * @list: vpdma desc list to which we add this decriptor
 * @width: width of the image in pixels in memory
 * @c_rect: compose params of output image
 * @fmt: vpdma data format of the buffer
 * dma_addr: dma address as seen by VPDMA
 * max_width: enum for maximum width of data transfer
 * max_height: enum for maximum height of data transfer
 * chan: VPDMA channel
 * flags: VPDMA flags to configure some descriptor fileds
 */
void vpdma_add_out_dtd(struct vpdma_desc_list *list, int width,
                int stride, const struct v4l2_rect *c_rect,
                const struct vpdma_data_format *fmt, dma_addr_t dma_addr,
                int max_w, int max_h, enum vpdma_channel chan, u32 flags)
{
        vpdma_rawchan_add_out_dtd(list, width, stride, c_rect, fmt, dma_addr,
                                  max_w, max_h, chan_info[chan].num, flags);
}
EXPORT_SYMBOL(vpdma_add_out_dtd);

void vpdma_rawchan_add_out_dtd(struct vpdma_desc_list *list, int width,
                int stride, const struct v4l2_rect *c_rect,
                const struct vpdma_data_format *fmt, dma_addr_t dma_addr,
                int max_w, int max_h, int raw_vpdma_chan, u32 flags)
{
        int priority = 0;
        int field = 0;
        int notify = 1;
        int channel, next_chan;
        struct v4l2_rect rect = *c_rect;
        int depth = fmt->depth;
        struct vpdma_dtd *dtd;

        channel = next_chan = raw_vpdma_chan;

        if (fmt->type == VPDMA_DATA_FMT_TYPE_YUV &&
                        fmt->data_type == DATA_TYPE_C420) {
                rect.height >>= 1;
                rect.top >>= 1;
                depth = 8;
        }

        dma_addr += rect.top * stride + (rect.left * depth >> 3);

        dtd = list->next;
        WARN_ON((void *)(dtd + 1) > (list->buf.addr + list->buf.size));

        dtd->type_ctl_stride = dtd_type_ctl_stride(fmt->data_type,
                                        notify,
                                        field,
                                        !!(flags & VPDMA_DATA_FRAME_1D),
                                        !!(flags & VPDMA_DATA_EVEN_LINE_SKIP),
                                        !!(flags & VPDMA_DATA_ODD_LINE_SKIP),
                                        stride);
        dtd->w1 = 0;
        dtd->start_addr = (u32) dma_addr;
        dtd->pkt_ctl = dtd_pkt_ctl(!!(flags & VPDMA_DATA_MODE_TILED),
                                DTD_DIR_OUT, channel, priority, next_chan);
        dtd->desc_write_addr = dtd_desc_write_addr(0, 0, 0, 0);
        dtd->max_width_height = dtd_max_width_height(max_w, max_h);
        dtd->client_attr0 = 0;
        dtd->client_attr1 = 0;

        list->next = dtd + 1;

        dump_dtd(dtd);
}
EXPORT_SYMBOL(vpdma_rawchan_add_out_dtd);

/*
 * append an inbound data transfer descriptor to the given descriptor list,
 * this sets up a 'memory to client' VPDMA transfer for the given VPDMA channel
 *
 * @list: vpdma desc list to which we add this decriptor
 * @width: width of the image in pixels in memory(not the cropped width)
 * @c_rect: crop params of input image
 * @fmt: vpdma data format of the buffer
 * dma_addr: dma address as seen by VPDMA
 * chan: VPDMA channel
 * field: top or bottom field info of the input image
 * flags: VPDMA flags to configure some descriptor fileds
 * frame_width/height: the complete width/height of the image presented to the
 *                      client (this makes sense when multiple channels are
 *                      connected to the same client, forming a larger frame)
 * start_h, start_v: position where the given channel starts providing pixel
 *                      data to the client (makes sense when multiple channels
 *                      contribute to the client)
 */
void vpdma_add_in_dtd(struct vpdma_desc_list *list, int width,
                int stride, const struct v4l2_rect *c_rect,
                const struct vpdma_data_format *fmt, dma_addr_t dma_addr,
                enum vpdma_channel chan, int field, u32 flags, int frame_width,
                int frame_height, int start_h, int start_v)
{
        int priority = 0;
        int notify = 1;
        int depth = fmt->depth;
        int channel, next_chan;
        struct v4l2_rect rect = *c_rect;
        struct vpdma_dtd *dtd;

        channel = next_chan = chan_info[chan].num;

        if (fmt->type == VPDMA_DATA_FMT_TYPE_YUV &&
                        fmt->data_type == DATA_TYPE_C420) {
                rect.height >>= 1;
                rect.top >>= 1;
                depth = 8;
        }

        dma_addr += rect.top * stride + (rect.left * depth >> 3);

        dtd = list->next;
        WARN_ON((void *)(dtd + 1) > (list->buf.addr + list->buf.size));

        dtd->type_ctl_stride = dtd_type_ctl_stride(fmt->data_type,
                                        notify,
                                        field,
                                        !!(flags & VPDMA_DATA_FRAME_1D),
                                        !!(flags & VPDMA_DATA_EVEN_LINE_SKIP),
                                        !!(flags & VPDMA_DATA_ODD_LINE_SKIP),
                                        stride);

        dtd->xfer_length_height = dtd_xfer_length_height(rect.width,
                                        rect.height);
        dtd->start_addr = (u32) dma_addr;
        dtd->pkt_ctl = dtd_pkt_ctl(!!(flags & VPDMA_DATA_MODE_TILED),
                                DTD_DIR_IN, channel, priority, next_chan);
        dtd->frame_width_height = dtd_frame_width_height(frame_width,
                                        frame_height);
        dtd->start_h_v = dtd_start_h_v(start_h, start_v);
        dtd->client_attr0 = 0;
        dtd->client_attr1 = 0;

        list->next = dtd + 1;

        dump_dtd(dtd);
}
EXPORT_SYMBOL(vpdma_add_in_dtd);

int vpdma_hwlist_alloc(struct vpdma_data *vpdma, void *priv)
{
        int i, list_num = -1;
        unsigned long flags;

        spin_lock_irqsave(&vpdma->lock, flags);
        for (i = 0; i < VPDMA_MAX_NUM_LIST &&
            vpdma->hwlist_used[i] == true; i++)
                ;

        if (i < VPDMA_MAX_NUM_LIST) {
                list_num = i;
                vpdma->hwlist_used[i] = true;
                vpdma->hwlist_priv[i] = priv;
        }
        spin_unlock_irqrestore(&vpdma->lock, flags);

        return list_num;
}
EXPORT_SYMBOL(vpdma_hwlist_alloc);

void *vpdma_hwlist_get_priv(struct vpdma_data *vpdma, int list_num)
{
        if (!vpdma || list_num >= VPDMA_MAX_NUM_LIST)
                return NULL;

        return vpdma->hwlist_priv[list_num];
}
EXPORT_SYMBOL(vpdma_hwlist_get_priv);

void *vpdma_hwlist_release(struct vpdma_data *vpdma, int list_num)
{
        void *priv;
        unsigned long flags;

        spin_lock_irqsave(&vpdma->lock, flags);
        vpdma->hwlist_used[list_num] = false;
        priv = vpdma->hwlist_priv;
        spin_unlock_irqrestore(&vpdma->lock, flags);

        return priv;
}
EXPORT_SYMBOL(vpdma_hwlist_release);

/* set or clear the mask for list complete interrupt */
void vpdma_enable_list_complete_irq(struct vpdma_data *vpdma, int irq_num,
                int list_num, bool enable)
{
        u32 reg_addr = VPDMA_INT_LIST0_MASK + VPDMA_INTX_OFFSET * irq_num;
        u32 val;

        val = read_reg(vpdma, reg_addr);
        if (enable)
                val |= (1 << (list_num * 2));
        else
                val &= ~(1 << (list_num * 2));
        write_reg(vpdma, reg_addr, val);
}
EXPORT_SYMBOL(vpdma_enable_list_complete_irq);

/* get the LIST_STAT register */
unsigned int vpdma_get_list_stat(struct vpdma_data *vpdma, int irq_num)
{
        u32 reg_addr = VPDMA_INT_LIST0_STAT + VPDMA_INTX_OFFSET * irq_num;

        return read_reg(vpdma, reg_addr);
}
EXPORT_SYMBOL(vpdma_get_list_stat);

/* get the LIST_MASK register */
unsigned int vpdma_get_list_mask(struct vpdma_data *vpdma, int irq_num)
{
        u32 reg_addr = VPDMA_INT_LIST0_MASK + VPDMA_INTX_OFFSET * irq_num;

        return read_reg(vpdma, reg_addr);
}
EXPORT_SYMBOL(vpdma_get_list_mask);

/* clear previosuly occured list intterupts in the LIST_STAT register */
void vpdma_clear_list_stat(struct vpdma_data *vpdma, int irq_num,
                           int list_num)
{
        u32 reg_addr = VPDMA_INT_LIST0_STAT + VPDMA_INTX_OFFSET * irq_num;

        write_reg(vpdma, reg_addr, 3 << (list_num * 2));
}
EXPORT_SYMBOL(vpdma_clear_list_stat);

void vpdma_set_bg_color(struct vpdma_data *vpdma,
                struct vpdma_data_format *fmt, u32 color)
{
        if (fmt->type == VPDMA_DATA_FMT_TYPE_RGB)
                write_reg(vpdma, VPDMA_BG_RGB, color);
        else if (fmt->type == VPDMA_DATA_FMT_TYPE_YUV)
                write_reg(vpdma, VPDMA_BG_YUV, color);
}
EXPORT_SYMBOL(vpdma_set_bg_color);

/*
 * configures the output mode of the line buffer for the given client, the
 * line buffer content can either be mirrored(each line repeated twice) or
 * passed to the client as is
 */
void vpdma_set_line_mode(struct vpdma_data *vpdma, int line_mode,
                enum vpdma_channel chan)
{
        int client_cstat = chan_info[chan].cstat_offset;

        write_field_reg(vpdma, client_cstat, line_mode,
                VPDMA_CSTAT_LINE_MODE_MASK, VPDMA_CSTAT_LINE_MODE_SHIFT);
}
EXPORT_SYMBOL(vpdma_set_line_mode);

/*
 * configures the event which should trigger VPDMA transfer for the given
 * client
 */
void vpdma_set_frame_start_event(struct vpdma_data *vpdma,
                enum vpdma_frame_start_event fs_event,
                enum vpdma_channel chan)
{
        int client_cstat = chan_info[chan].cstat_offset;

        write_field_reg(vpdma, client_cstat, fs_event,
                VPDMA_CSTAT_FRAME_START_MASK, VPDMA_CSTAT_FRAME_START_SHIFT);
}
EXPORT_SYMBOL(vpdma_set_frame_start_event);

static void vpdma_firmware_cb(const struct firmware *f, void *context)
{
        struct vpdma_data *vpdma = context;
        struct vpdma_buf fw_dma_buf;
        int i, r;

        dev_dbg(&vpdma->pdev->dev, "firmware callback\n");

        if (!f || !f->data) {
                dev_err(&vpdma->pdev->dev, "couldn't get firmware\n");
                return;
        }

        /* already initialized */
        if (read_field_reg(vpdma, VPDMA_LIST_ATTR, VPDMA_LIST_RDY_MASK,
                        VPDMA_LIST_RDY_SHFT)) {
                vpdma->cb(vpdma->pdev);
                return;
        }

        r = vpdma_alloc_desc_buf(&fw_dma_buf, f->size);
        if (r) {
                dev_err(&vpdma->pdev->dev,
                        "failed to allocate dma buffer for firmware\n");
                goto rel_fw;
        }

        memcpy(fw_dma_buf.addr, f->data, f->size);

        vpdma_map_desc_buf(vpdma, &fw_dma_buf);

        write_reg(vpdma, VPDMA_LIST_ADDR, (u32) fw_dma_buf.dma_addr);

        for (i = 0; i < 100; i++) {             /* max 1 second */
                msleep_interruptible(10);

                if (read_field_reg(vpdma, VPDMA_LIST_ATTR, VPDMA_LIST_RDY_MASK,
                                VPDMA_LIST_RDY_SHFT))
                        break;
        }

        if (i == 100) {
                dev_err(&vpdma->pdev->dev, "firmware upload failed\n");
                goto free_buf;
        }

        vpdma->cb(vpdma->pdev);

free_buf:
        vpdma_unmap_desc_buf(vpdma, &fw_dma_buf);

        vpdma_free_desc_buf(&fw_dma_buf);
rel_fw:
        release_firmware(f);
}

static int vpdma_load_firmware(struct vpdma_data *vpdma)
{
        int r;
        struct device *dev = &vpdma->pdev->dev;

        r = request_firmware_nowait(THIS_MODULE, 1,
                (const char *) VPDMA_FIRMWARE, dev, GFP_KERNEL, vpdma,
                vpdma_firmware_cb);
        if (r) {
                dev_err(dev, "firmware not available %s\n", VPDMA_FIRMWARE);
                return r;
        } else {
                dev_info(dev, "loading firmware %s\n", VPDMA_FIRMWARE);
        }

        return 0;
}

int vpdma_create(struct platform_device *pdev, struct vpdma_data *vpdma,
                void (*cb)(struct platform_device *pdev))
{
        struct resource *res;
        int r;

        dev_dbg(&pdev->dev, "vpdma_create\n");

        vpdma->pdev = pdev;
        vpdma->cb = cb;
        spin_lock_init(&vpdma->lock);

        res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "vpdma");
        if (res == NULL) {
                dev_err(&pdev->dev, "missing platform resources data\n");
                return -ENODEV;
        }

        vpdma->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
        if (!vpdma->base) {
                dev_err(&pdev->dev, "failed to ioremap\n");
                return -ENOMEM;
        }

        r = vpdma_load_firmware(vpdma);
        if (r) {
                pr_err("failed to load firmware %s\n", VPDMA_FIRMWARE);
                return r;
        }

        return 0;
}
EXPORT_SYMBOL(vpdma_create);

MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_FIRMWARE(VPDMA_FIRMWARE);
MODULE_LICENSE("GPL v2");