shmob_drm_plane.c

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/*
 * shmob_drm_plane.c  --  SH Mobile DRM Planes
 *
 * Copyright (C) 2012 Renesas Corporation
 *
 * Laurent Pinchart ([email protected])
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>

#include <video/sh_mobile_meram.h>

#include "shmob_drm_drv.h"
#include "shmob_drm_kms.h"
#include "shmob_drm_plane.h"
#include "shmob_drm_regs.h"

struct shmob_drm_plane {
    struct drm_plane plane;
    unsigned int index;
    unsigned int alpha;

    const struct shmob_drm_format_info *format;
    unsigned long dma[2];

    unsigned int src_x;
    unsigned int src_y;
    unsigned int crtc_x;
    unsigned int crtc_y;
    unsigned int crtc_w;
    unsigned int crtc_h;
};

#define to_shmob_plane(p)   container_of(p, struct shmob_drm_plane, plane)

static void shmob_drm_plane_compute_base(struct shmob_drm_plane *splane,
                     struct drm_framebuffer *fb,
                     int x, int y)
{
    struct drm_gem_cma_object *gem;
    unsigned int bpp;

    bpp = splane->format->yuv ? 8 : splane->format->bpp;
    gem = drm_fb_cma_get_gem_obj(fb, 0);
    splane->dma[0] = gem->paddr + fb->offsets[0]
               + y * fb->pitches[0] + x * bpp / 8;

    if (splane->format->yuv) {
        bpp = splane->format->bpp - 8;
        gem = drm_fb_cma_get_gem_obj(fb, 1);
        splane->dma[1] = gem->paddr + fb->offsets[1]
                   + y / (bpp == 4 ? 2 : 1) * fb->pitches[1]
                   + x * (bpp == 16 ? 2 : 1);
    }
}

static void __shmob_drm_plane_setup(struct shmob_drm_plane *splane,
                    struct drm_framebuffer *fb)
{
    struct shmob_drm_device *sdev = splane->plane.dev->dev_private;
    u32 format;

    /* TODO: Support ROP3 mode */
    format = LDBBSIFR_EN | (splane->alpha << LDBBSIFR_LAY_SHIFT);

    switch (splane->format->fourcc) {
    case DRM_FORMAT_RGB565:
    case DRM_FORMAT_NV21:
    case DRM_FORMAT_NV61:
    case DRM_FORMAT_NV42:
        format |= LDBBSIFR_SWPL | LDBBSIFR_SWPW;
        break;
    case DRM_FORMAT_RGB888:
    case DRM_FORMAT_NV12:
    case DRM_FORMAT_NV16:
    case DRM_FORMAT_NV24:
        format |= LDBBSIFR_SWPL | LDBBSIFR_SWPW | LDBBSIFR_SWPB;
        break;
    case DRM_FORMAT_ARGB8888:
    default:
        format |= LDBBSIFR_SWPL;
        break;
    }

    switch (splane->format->fourcc) {
    case DRM_FORMAT_RGB565:
        format |= LDBBSIFR_AL_1 | LDBBSIFR_RY | LDBBSIFR_RPKF_RGB16;
        break;
    case DRM_FORMAT_RGB888:
        format |= LDBBSIFR_AL_1 | LDBBSIFR_RY | LDBBSIFR_RPKF_RGB24;
        break;
    case DRM_FORMAT_ARGB8888:
        format |= LDBBSIFR_AL_PK | LDBBSIFR_RY | LDDFR_PKF_ARGB32;
        break;
    case DRM_FORMAT_NV12:
    case DRM_FORMAT_NV21:
        format |= LDBBSIFR_AL_1 | LDBBSIFR_CHRR_420;
        break;
    case DRM_FORMAT_NV16:
    case DRM_FORMAT_NV61:
        format |= LDBBSIFR_AL_1 | LDBBSIFR_CHRR_422;
        break;
    case DRM_FORMAT_NV24:
    case DRM_FORMAT_NV42:
        format |= LDBBSIFR_AL_1 | LDBBSIFR_CHRR_444;
        break;
    }

#define plane_reg_dump(sdev, splane, reg) \
    dev_dbg(sdev->ddev->dev, "%s(%u): %s 0x%08x 0x%08x\n", __func__, \
        splane->index, #reg, \
        lcdc_read(sdev, reg(splane->index)), \
        lcdc_read(sdev, reg(splane->index) + LCDC_SIDE_B_OFFSET))

    plane_reg_dump(sdev, splane, LDBnBSIFR);
    plane_reg_dump(sdev, splane, LDBnBSSZR);
    plane_reg_dump(sdev, splane, LDBnBLOCR);
    plane_reg_dump(sdev, splane, LDBnBSMWR);
    plane_reg_dump(sdev, splane, LDBnBSAYR);
    plane_reg_dump(sdev, splane, LDBnBSACR);

    lcdc_write(sdev, LDBCR, LDBCR_UPC(splane->index));
    dev_dbg(sdev->ddev->dev, "%s(%u): %s 0x%08x\n", __func__, splane->index,
        "LDBCR", lcdc_read(sdev, LDBCR));

    lcdc_write(sdev, LDBnBSIFR(splane->index), format);

    lcdc_write(sdev, LDBnBSSZR(splane->index),
           (splane->crtc_h << LDBBSSZR_BVSS_SHIFT) |
           (splane->crtc_w << LDBBSSZR_BHSS_SHIFT));
    lcdc_write(sdev, LDBnBLOCR(splane->index),
           (splane->crtc_y << LDBBLOCR_CVLC_SHIFT) |
           (splane->crtc_x << LDBBLOCR_CHLC_SHIFT));
    lcdc_write(sdev, LDBnBSMWR(splane->index),
           fb->pitches[0] << LDBBSMWR_BSMW_SHIFT);

    shmob_drm_plane_compute_base(splane, fb, splane->src_x, splane->src_y);

    lcdc_write(sdev, LDBnBSAYR(splane->index), splane->dma[0]);
    if (splane->format->yuv)
        lcdc_write(sdev, LDBnBSACR(splane->index), splane->dma[1]);

    lcdc_write(sdev, LDBCR,
           LDBCR_UPF(splane->index) | LDBCR_UPD(splane->index));
    dev_dbg(sdev->ddev->dev, "%s(%u): %s 0x%08x\n", __func__, splane->index,
        "LDBCR", lcdc_read(sdev, LDBCR));

    plane_reg_dump(sdev, splane, LDBnBSIFR);
    plane_reg_dump(sdev, splane, LDBnBSSZR);
    plane_reg_dump(sdev, splane, LDBnBLOCR);
    plane_reg_dump(sdev, splane, LDBnBSMWR);
    plane_reg_dump(sdev, splane, LDBnBSAYR);
    plane_reg_dump(sdev, splane, LDBnBSACR);
}

void shmob_drm_plane_setup(struct drm_plane *plane)
{
    struct shmob_drm_plane *splane = to_shmob_plane(plane);

    if (plane->fb == NULL || !plane->enabled)
        return;

    __shmob_drm_plane_setup(splane, plane->fb);
}

static int
shmob_drm_plane_update(struct drm_plane *plane, struct drm_crtc *crtc,
               struct drm_framebuffer *fb, int crtc_x, int crtc_y,
               unsigned int crtc_w, unsigned int crtc_h,
               uint32_t src_x, uint32_t src_y,
               uint32_t src_w, uint32_t src_h)
{
    struct shmob_drm_plane *splane = to_shmob_plane(plane);
    struct shmob_drm_device *sdev = plane->dev->dev_private;
    const struct shmob_drm_format_info *format;

    format = shmob_drm_format_info(fb->pixel_format);
    if (format == NULL) {
        dev_dbg(sdev->dev, "update_plane: unsupported format %08x\n",
            fb->pixel_format);
        return -EINVAL;
    }

    if (src_w >> 16 != crtc_w || src_h >> 16 != crtc_h) {
        dev_dbg(sdev->dev, "%s: scaling not supported\n", __func__);
        return -EINVAL;
    }

    splane->format = format;

    splane->src_x = src_x >> 16;
    splane->src_y = src_y >> 16;
    splane->crtc_x = crtc_x;
    splane->crtc_y = crtc_y;
    splane->crtc_w = crtc_w;
    splane->crtc_h = crtc_h;

    __shmob_drm_plane_setup(splane, fb);
    return 0;
}

static int shmob_drm_plane_disable(struct drm_plane *plane)
{
    struct shmob_drm_plane *splane = to_shmob_plane(plane);
    struct shmob_drm_device *sdev = plane->dev->dev_private;

    splane->format = NULL;

    lcdc_write(sdev, LDBnBSIFR(splane->index), 0);
    return 0;
}

static void shmob_drm_plane_destroy(struct drm_plane *plane)
{
    struct shmob_drm_plane *splane = to_shmob_plane(plane);

    shmob_drm_plane_disable(plane);
    drm_plane_cleanup(plane);
    kfree(splane);
}

static const struct drm_plane_funcs shmob_drm_plane_funcs = {
    .update_plane = shmob_drm_plane_update,
    .disable_plane = shmob_drm_plane_disable,
    .destroy = shmob_drm_plane_destroy,
};

static const uint32_t formats[] = {
    DRM_FORMAT_RGB565,
    DRM_FORMAT_RGB888,
    DRM_FORMAT_ARGB8888,
    DRM_FORMAT_NV12,
    DRM_FORMAT_NV21,
    DRM_FORMAT_NV16,
    DRM_FORMAT_NV61,
    DRM_FORMAT_NV24,
    DRM_FORMAT_NV42,
};

int shmob_drm_plane_create(struct shmob_drm_device *sdev, unsigned int index)
{
    struct shmob_drm_plane *splane;
    int ret;

    splane = kzalloc(sizeof(*splane), GFP_KERNEL);
    if (splane == NULL)
        return -ENOMEM;

    splane->index = index;
    splane->alpha = 255;

    ret = drm_plane_init(sdev->ddev, &splane->plane, 1,
                 &shmob_drm_plane_funcs, formats,
                 ARRAY_SIZE(formats), false);
    if (ret < 0)
        kfree(splane);

    return ret;
}