omap_vout_vrfb.c

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/*
 * omap_vout_vrfb.c
 *
 * Copyright (C) 2010 Texas Instruments.
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 *
 */

#include <linux/sched.h>
#include <linux/platform_device.h>
#include <linux/videodev2.h>

#include <media/videobuf-dma-contig.h>
#include <media/v4l2-device.h>

#include <plat/dma.h>
#include <plat/vrfb.h>

#include "omap_voutdef.h"
#include "omap_voutlib.h"

/*
 * Function for allocating video buffers
 */
static int omap_vout_allocate_vrfb_buffers(struct omap_vout_device *vout,
        unsigned int *count, int startindex)
{
    int i, j;

    for (i = 0; i < *count; i++) {
        if (!vout->smsshado_virt_addr[i]) {
            vout->smsshado_virt_addr[i] =
                omap_vout_alloc_buffer(vout->smsshado_size,
                        &vout->smsshado_phy_addr[i]);
        }
        if (!vout->smsshado_virt_addr[i] && startindex != -1) {
            if (V4L2_MEMORY_MMAP == vout->memory && i >= startindex)
                break;
        }
        if (!vout->smsshado_virt_addr[i]) {
            for (j = 0; j < i; j++) {
                omap_vout_free_buffer(
                        vout->smsshado_virt_addr[j],
                        vout->smsshado_size);
                vout->smsshado_virt_addr[j] = 0;
                vout->smsshado_phy_addr[j] = 0;
            }
            *count = 0;
            return -ENOMEM;
        }
        memset((void *) vout->smsshado_virt_addr[i], 0,
                vout->smsshado_size);
    }
    return 0;
}

/*
 * Wakes up the application once the DMA transfer to VRFB space is completed.
 */
static void omap_vout_vrfb_dma_tx_callback(int lch, u16 ch_status, void *data)
{
    struct vid_vrfb_dma *t = (struct vid_vrfb_dma *) data;

    t->tx_status = 1;
    wake_up_interruptible(&t->wait);
}

/*
 * Free VRFB buffers
 */
void omap_vout_free_vrfb_buffers(struct omap_vout_device *vout)
{
    int j;

    for (j = 0; j < VRFB_NUM_BUFS; j++) {
        omap_vout_free_buffer(vout->smsshado_virt_addr[j],
                vout->smsshado_size);
        vout->smsshado_virt_addr[j] = 0;
        vout->smsshado_phy_addr[j] = 0;
    }
}

int omap_vout_setup_vrfb_bufs(struct platform_device *pdev, int vid_num,
                  bool static_vrfb_allocation)
{
    int ret = 0, i, j;
    struct omap_vout_device *vout;
    struct video_device *vfd;
    int image_width, image_height;
    int vrfb_num_bufs = VRFB_NUM_BUFS;
    struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
    struct omap2video_device *vid_dev =
        container_of(v4l2_dev, struct omap2video_device, v4l2_dev);

    vout = vid_dev->vouts[vid_num];
    vfd = vout->vfd;

    for (i = 0; i < VRFB_NUM_BUFS; i++) {
        if (omap_vrfb_request_ctx(&vout->vrfb_context[i])) {
            dev_info(&pdev->dev, ": VRFB allocation failed\n");
            for (j = 0; j < i; j++)
                omap_vrfb_release_ctx(&vout->vrfb_context[j]);
            ret = -ENOMEM;
            goto free_buffers;
        }
    }

    /* Calculate VRFB memory size */
    /* allocate for worst case size */
    image_width = VID_MAX_WIDTH / TILE_SIZE;
    if (VID_MAX_WIDTH % TILE_SIZE)
        image_width++;

    image_width = image_width * TILE_SIZE;
    image_height = VID_MAX_HEIGHT / TILE_SIZE;

    if (VID_MAX_HEIGHT % TILE_SIZE)
        image_height++;

    image_height = image_height * TILE_SIZE;
    vout->smsshado_size = PAGE_ALIGN(image_width * image_height * 2 * 2);

    /*
     * Request and Initialize DMA, for DMA based VRFB transfer
     */
    vout->vrfb_dma_tx.dev_id = OMAP_DMA_NO_DEVICE;
    vout->vrfb_dma_tx.dma_ch = -1;
    vout->vrfb_dma_tx.req_status = DMA_CHAN_ALLOTED;
    ret = omap_request_dma(vout->vrfb_dma_tx.dev_id, "VRFB DMA TX",
            omap_vout_vrfb_dma_tx_callback,
            (void *) &vout->vrfb_dma_tx, &vout->vrfb_dma_tx.dma_ch);
    if (ret < 0) {
        vout->vrfb_dma_tx.req_status = DMA_CHAN_NOT_ALLOTED;
        dev_info(&pdev->dev, ": failed to allocate DMA Channel for"
                " video%d\n", vfd->minor);
    }
    init_waitqueue_head(&vout->vrfb_dma_tx.wait);

    /* statically allocated the VRFB buffer is done through
       commands line aruments */
    if (static_vrfb_allocation) {
        if (omap_vout_allocate_vrfb_buffers(vout, &vrfb_num_bufs, -1)) {
            ret =  -ENOMEM;
            goto release_vrfb_ctx;
        }
        vout->vrfb_static_allocation = 1;
    }
    return 0;

release_vrfb_ctx:
    for (j = 0; j < VRFB_NUM_BUFS; j++)
        omap_vrfb_release_ctx(&vout->vrfb_context[j]);
free_buffers:
    omap_vout_free_buffers(vout);

    return ret;
}

/*
 * Release the VRFB context once the module exits
 */
void omap_vout_release_vrfb(struct omap_vout_device *vout)
{
    int i;

    for (i = 0; i < VRFB_NUM_BUFS; i++)
        omap_vrfb_release_ctx(&vout->vrfb_context[i]);

    if (vout->vrfb_dma_tx.req_status == DMA_CHAN_ALLOTED) {
        vout->vrfb_dma_tx.req_status = DMA_CHAN_NOT_ALLOTED;
        omap_free_dma(vout->vrfb_dma_tx.dma_ch);
    }
}

/*
 * Allocate the buffers for the VRFB space.  Data is copied from V4L2
 * buffers to the VRFB buffers using the DMA engine.
 */
int omap_vout_vrfb_buffer_setup(struct omap_vout_device *vout,
              unsigned int *count, unsigned int startindex)
{
    int i;
    bool yuv_mode;

    if (!is_rotation_enabled(vout))
        return 0;

    /* If rotation is enabled, allocate memory for VRFB space also */
    *count = *count > VRFB_NUM_BUFS ? VRFB_NUM_BUFS : *count;

    /* Allocate the VRFB buffers only if the buffers are not
     * allocated during init time.
     */
    if (!vout->vrfb_static_allocation)
        if (omap_vout_allocate_vrfb_buffers(vout, count, startindex))
            return -ENOMEM;

    if (vout->dss_mode == OMAP_DSS_COLOR_YUV2 ||
            vout->dss_mode == OMAP_DSS_COLOR_UYVY)
        yuv_mode = true;
    else
        yuv_mode = false;

    for (i = 0; i < *count; i++)
        omap_vrfb_setup(&vout->vrfb_context[i],
                vout->smsshado_phy_addr[i], vout->pix.width,
                vout->pix.height, vout->bpp, yuv_mode);

    return 0;
}

int omap_vout_prepare_vrfb(struct omap_vout_device *vout,
                struct videobuf_buffer *vb)
{
    dma_addr_t dmabuf;
    struct vid_vrfb_dma *tx;
    enum dss_rotation rotation;
    u32 dest_frame_index = 0, src_element_index = 0;
    u32 dest_element_index = 0, src_frame_index = 0;
    u32 elem_count = 0, frame_count = 0, pixsize = 2;

    if (!is_rotation_enabled(vout))
        return 0;

    dmabuf = vout->buf_phy_addr[vb->i];
    /* If rotation is enabled, copy input buffer into VRFB
     * memory space using DMA. We are copying input buffer
     * into VRFB memory space of desired angle and DSS will
     * read image VRFB memory for 0 degree angle
     */
    pixsize = vout->bpp * vout->vrfb_bpp;
    /*
     * DMA transfer in double index mode
     */

    /* Frame index */
    dest_frame_index = ((MAX_PIXELS_PER_LINE * pixsize) -
            (vout->pix.width * vout->bpp)) + 1;

    /* Source and destination parameters */
    src_element_index = 0;
    src_frame_index = 0;
    dest_element_index = 1;
    /* Number of elements per frame */
    elem_count = vout->pix.width * vout->bpp;
    frame_count = vout->pix.height;
    tx = &vout->vrfb_dma_tx;
    tx->tx_status = 0;
    omap_set_dma_transfer_params(tx->dma_ch, OMAP_DMA_DATA_TYPE_S32,
            (elem_count / 4), frame_count, OMAP_DMA_SYNC_ELEMENT,
            tx->dev_id, 0x0);
    /* src_port required only for OMAP1 */
    omap_set_dma_src_params(tx->dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
            dmabuf, src_element_index, src_frame_index);
    /*set dma source burst mode for VRFB */
    omap_set_dma_src_burst_mode(tx->dma_ch, OMAP_DMA_DATA_BURST_16);
    rotation = calc_rotation(vout);

    /* dest_port required only for OMAP1 */
    omap_set_dma_dest_params(tx->dma_ch, 0, OMAP_DMA_AMODE_DOUBLE_IDX,
            vout->vrfb_context[vb->i].paddr[0], dest_element_index,
            dest_frame_index);
    /*set dma dest burst mode for VRFB */
    omap_set_dma_dest_burst_mode(tx->dma_ch, OMAP_DMA_DATA_BURST_16);
    omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE, 0x20, 0);

    omap_start_dma(tx->dma_ch);
    interruptible_sleep_on_timeout(&tx->wait, VRFB_TX_TIMEOUT);

    if (tx->tx_status == 0) {
        omap_stop_dma(tx->dma_ch);
        return -EINVAL;
    }
    /* Store buffers physical address into an array. Addresses
     * from this array will be used to configure DSS */
    vout->queued_buf_addr[vb->i] = (u8 *)
        vout->vrfb_context[vb->i].paddr[rotation];
    return 0;
}

/*
 * Calculate the buffer offsets from which the streaming should
 * start. This offset calculation is mainly required because of
 * the VRFB 32 pixels alignment with rotation.
 */
void omap_vout_calculate_vrfb_offset(struct omap_vout_device *vout)
{
    enum dss_rotation rotation;
    bool mirroring = vout->mirror;
    struct v4l2_rect *crop = &vout->crop;
    struct v4l2_pix_format *pix = &vout->pix;
    int *cropped_offset = &vout->cropped_offset;
    int vr_ps = 1, ps = 2, temp_ps = 2;
    int offset = 0, ctop = 0, cleft = 0, line_length = 0;

    rotation = calc_rotation(vout);

    if (V4L2_PIX_FMT_YUYV == pix->pixelformat ||
            V4L2_PIX_FMT_UYVY == pix->pixelformat) {
        if (is_rotation_enabled(vout)) {
            /*
             * ps    - Actual pixel size for YUYV/UYVY for
             *         VRFB/Mirroring is 4 bytes
             * vr_ps - Virtually pixel size for YUYV/UYVY is
             *         2 bytes
             */
            ps = 4;
            vr_ps = 2;
        } else {
            ps = 2; /* otherwise the pixel size is 2 byte */
        }
    } else if (V4L2_PIX_FMT_RGB32 == pix->pixelformat) {
        ps = 4;
    } else if (V4L2_PIX_FMT_RGB24 == pix->pixelformat) {
        ps = 3;
    }
    vout->ps = ps;
    vout->vr_ps = vr_ps;

    if (is_rotation_enabled(vout)) {
        line_length = MAX_PIXELS_PER_LINE;
        ctop = (pix->height - crop->height) - crop->top;
        cleft = (pix->width - crop->width) - crop->left;
    } else {
        line_length = pix->width;
    }
    vout->line_length = line_length;
    switch (rotation) {
    case dss_rotation_90_degree:
        offset = vout->vrfb_context[0].yoffset *
            vout->vrfb_context[0].bytespp;
        temp_ps = ps / vr_ps;
        if (mirroring == 0) {
            *cropped_offset = offset + line_length *
                temp_ps * cleft + crop->top * temp_ps;
        } else {
            *cropped_offset = offset + line_length * temp_ps *
                cleft + crop->top * temp_ps + (line_length *
                ((crop->width / (vr_ps)) - 1) * ps);
        }
        break;
    case dss_rotation_180_degree:
        offset = ((MAX_PIXELS_PER_LINE * vout->vrfb_context[0].yoffset *
            vout->vrfb_context[0].bytespp) +
            (vout->vrfb_context[0].xoffset *
            vout->vrfb_context[0].bytespp));
        if (mirroring == 0) {
            *cropped_offset = offset + (line_length * ps * ctop) +
                (cleft / vr_ps) * ps;

        } else {
            *cropped_offset = offset + (line_length * ps * ctop) +
                (cleft / vr_ps) * ps + (line_length *
                (crop->height - 1) * ps);
        }
        break;
    case dss_rotation_270_degree:
        offset = MAX_PIXELS_PER_LINE * vout->vrfb_context[0].xoffset *
            vout->vrfb_context[0].bytespp;
        temp_ps = ps / vr_ps;
        if (mirroring == 0) {
            *cropped_offset = offset + line_length *
                temp_ps * crop->left + ctop * ps;
        } else {
            *cropped_offset = offset + line_length *
                temp_ps * crop->left + ctop * ps +
                (line_length * ((crop->width / vr_ps) - 1) *
                 ps);
        }
        break;
    case dss_rotation_0_degree:
        if (mirroring == 0) {
            *cropped_offset = (line_length * ps) *
                crop->top + (crop->left / vr_ps) * ps;
        } else {
            *cropped_offset = (line_length * ps) *
                crop->top + (crop->left / vr_ps) * ps +
                (line_length * (crop->height - 1) * ps);
        }
        break;
    default:
        *cropped_offset = (line_length * ps * crop->top) /
            vr_ps + (crop->left * ps) / vr_ps +
            ((crop->width / vr_ps) - 1) * ps;
        break;
    }
}