/*
 * drivers/gpu/drm/omapdrm/omap_fb.c
 *
 * Copyright (C) 2011 Texas Instruments
 * Author: Rob Clark <rob@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.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/seq_file.h>

#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>

#include "omap_dmm_tiler.h"
#include "omap_drv.h"

/*
 * framebuffer funcs
 */

/* per-format info: */
struct format {
	enum omap_color_mode dss_format;
	uint32_t pixel_format;
	struct {
		int stride_bpp;           /* this times width is stride */
		int sub_y;                /* sub-sample in y dimension */
	} planes[4];
	bool yuv;
};

static const struct format formats[] = {
	/* 16bpp [A]RGB: */
	{ OMAP_DSS_COLOR_RGB16,       DRM_FORMAT_RGB565,   {{2, 1}}, false }, /* RGB16-565 */
	{ OMAP_DSS_COLOR_RGB12U,      DRM_FORMAT_RGBX4444, {{2, 1}}, false }, /* RGB12x-4444 */
	{ OMAP_DSS_COLOR_RGBX16,      DRM_FORMAT_XRGB4444, {{2, 1}}, false }, /* xRGB12-4444 */
	{ OMAP_DSS_COLOR_RGBA16,      DRM_FORMAT_RGBA4444, {{2, 1}}, false }, /* RGBA12-4444 */
	{ OMAP_DSS_COLOR_ARGB16,      DRM_FORMAT_ARGB4444, {{2, 1}}, false }, /* ARGB16-4444 */
	{ OMAP_DSS_COLOR_XRGB16_1555, DRM_FORMAT_XRGB1555, {{2, 1}}, false }, /* xRGB15-1555 */
	{ OMAP_DSS_COLOR_ARGB16_1555, DRM_FORMAT_ARGB1555, {{2, 1}}, false }, /* ARGB16-1555 */
	/* 24bpp RGB: */
	{ OMAP_DSS_COLOR_RGB24P,      DRM_FORMAT_RGB888,   {{3, 1}}, false }, /* RGB24-888 */
	/* 32bpp [A]RGB: */
	{ OMAP_DSS_COLOR_RGBX32,      DRM_FORMAT_RGBX8888, {{4, 1}}, false }, /* RGBx24-8888 */
	{ OMAP_DSS_COLOR_RGB24U,      DRM_FORMAT_XRGB8888, {{4, 1}}, false }, /* xRGB24-8888 */
	{ OMAP_DSS_COLOR_RGBA32,      DRM_FORMAT_RGBA8888, {{4, 1}}, false }, /* RGBA32-8888 */
	{ OMAP_DSS_COLOR_ARGB32,      DRM_FORMAT_ARGB8888, {{4, 1}}, false }, /* ARGB32-8888 */
	/* YUV: */
	{ OMAP_DSS_COLOR_NV12,        DRM_FORMAT_NV12,     {{1, 1}, {1, 2}}, true },
	{ OMAP_DSS_COLOR_YUV2,        DRM_FORMAT_YUYV,     {{2, 1}}, true },
	{ OMAP_DSS_COLOR_UYVY,        DRM_FORMAT_UYVY,     {{2, 1}}, true },
};

/* convert from overlay's pixel formats bitmask to an array of fourcc's */
uint32_t omap_framebuffer_get_formats(uint32_t *pixel_formats,
		uint32_t max_formats, enum omap_color_mode supported_modes)
{
	uint32_t nformats = 0;
	int i = 0;

	for (i = 0; i < ARRAY_SIZE(formats) && nformats < max_formats; i++)
		if (formats[i].dss_format & supported_modes)
			pixel_formats[nformats++] = formats[i].pixel_format;

	return nformats;
}

/* per-plane info for the fb: */
struct plane {
	struct drm_gem_object *bo;
	uint32_t pitch;
	uint32_t offset;
	dma_addr_t paddr;
};

#define to_omap_framebuffer(x) container_of(x, struct omap_framebuffer, base)

struct omap_framebuffer {
	struct drm_framebuffer base;
	int pin_count;
	const struct format *format;
	struct plane planes[4];
	/* lock for pinning (pin_count and planes.paddr) */
	struct mutex lock;
};

static int omap_framebuffer_create_handle(struct drm_framebuffer *fb,
		struct drm_file *file_priv,
		unsigned int *handle)
{
	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
	return drm_gem_handle_create(file_priv,
			omap_fb->planes[0].bo, handle);
}

static void omap_framebuffer_destroy(struct drm_framebuffer *fb)
{
	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
	int i, n = fb->format->num_planes;

	DBG("destroy: FB ID: %d (%p)", fb->base.id, fb);

	drm_framebuffer_cleanup(fb);

	for (i = 0; i < n; i++) {
		struct plane *plane = &omap_fb->planes[i];

		drm_gem_object_unreference_unlocked(plane->bo);
	}

	kfree(omap_fb);
}

static const struct drm_framebuffer_funcs omap_framebuffer_funcs = {
	.create_handle = omap_framebuffer_create_handle,
	.destroy = omap_framebuffer_destroy,
};

static uint32_t get_linear_addr(struct plane *plane,
		const struct format *format, int n, int x, int y)
{
	uint32_t offset;

	offset = plane->offset +
			(x * format->planes[n].stride_bpp) +
			(y * plane->pitch / format->planes[n].sub_y);

	return plane->paddr + offset;
}

bool omap_framebuffer_supports_rotation(struct drm_framebuffer *fb)
{
	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
	struct plane *plane = &omap_fb->planes[0];

	return omap_gem_flags(plane->bo) & OMAP_BO_TILED;
}

/* update ovl info for scanout, handles cases of multi-planar fb's, etc.
 */
void omap_framebuffer_update_scanout(struct drm_framebuffer *fb,
		struct omap_drm_window *win, struct omap_overlay_info *info)
{
	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
	const struct format *format = omap_fb->format;
	struct plane *plane = &omap_fb->planes[0];
	uint32_t x, y, orient = 0;

	info->color_mode = format->dss_format;

	info->pos_x      = win->crtc_x;
	info->pos_y      = win->crtc_y;
	info->out_width  = win->crtc_w;
	info->out_height = win->crtc_h;
	info->width      = win->src_w;
	info->height     = win->src_h;

	x = win->src_x;
	y = win->src_y;

	if (omap_gem_flags(plane->bo) & OMAP_BO_TILED) {
		uint32_t w = win->src_w;
		uint32_t h = win->src_h;

		switch (win->rotation & DRM_ROTATE_MASK) {
		default:
			dev_err(fb->dev->dev, "invalid rotation: %02x",
					(uint32_t)win->rotation);
			/* fallthru to default to no rotation */
		case 0:
		case DRM_ROTATE_0:
			orient = 0;
			break;
		case DRM_ROTATE_90:
			orient = MASK_XY_FLIP | MASK_X_INVERT;
			break;
		case DRM_ROTATE_180:
			orient = MASK_X_INVERT | MASK_Y_INVERT;
			break;
		case DRM_ROTATE_270:
			orient = MASK_XY_FLIP | MASK_Y_INVERT;
			break;
		}

		if (win->rotation & DRM_REFLECT_X)
			orient ^= MASK_X_INVERT;

		if (win->rotation & DRM_REFLECT_Y)
			orient ^= MASK_Y_INVERT;

		/* adjust x,y offset for flip/invert: */
		if (orient & MASK_XY_FLIP)
			swap(w, h);
		if (orient & MASK_Y_INVERT)
			y += h - 1;
		if (orient & MASK_X_INVERT)
			x += w - 1;

		omap_gem_rotated_paddr(plane->bo, orient, x, y, &info->paddr);
		info->rotation_type = OMAP_DSS_ROT_TILER;
		info->screen_width  = omap_gem_tiled_stride(plane->bo, orient);
	} else {
		switch (win->rotation & DRM_ROTATE_MASK) {
		case 0:
		case DRM_ROTATE_0:
			/* OK */
			break;

		default:
			dev_warn(fb->dev->dev,
				"rotation '%d' ignored for non-tiled fb\n",
				win->rotation);
			win->rotation = 0;
			break;
		}

		info->paddr         = get_linear_addr(plane, format, 0, x, y);
		info->rotation_type = OMAP_DSS_ROT_DMA;
		info->screen_width  = plane->pitch;
	}

	/* convert to pixels: */
	info->screen_width /= format->planes[0].stride_bpp;

	if (format->dss_format == OMAP_DSS_COLOR_NV12) {
		plane = &omap_fb->planes[1];

		if (info->rotation_type == OMAP_DSS_ROT_TILER) {
			WARN_ON(!(omap_gem_flags(plane->bo) & OMAP_BO_TILED));
			omap_gem_rotated_paddr(plane->bo, orient,
					x/2, y/2, &info->p_uv_addr);
		} else {
			info->p_uv_addr = get_linear_addr(plane, format, 1, x, y);
		}
	} else {
		info->p_uv_addr = 0;
	}
}

/* pin, prepare for scanout: */
int omap_framebuffer_pin(struct drm_framebuffer *fb)
{
	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
	int ret, i, n = fb->format->num_planes;

	mutex_lock(&omap_fb->lock);

	if (omap_fb->pin_count > 0) {
		omap_fb->pin_count++;
		mutex_unlock(&omap_fb->lock);
		return 0;
	}

	for (i = 0; i < n; i++) {
		struct plane *plane = &omap_fb->planes[i];
		ret = omap_gem_get_paddr(plane->bo, &plane->paddr, true);
		if (ret)
			goto fail;
		omap_gem_dma_sync(plane->bo, DMA_TO_DEVICE);
	}

	omap_fb->pin_count++;

	mutex_unlock(&omap_fb->lock);

	return 0;

fail:
	for (i--; i >= 0; i--) {
		struct plane *plane = &omap_fb->planes[i];
		omap_gem_put_paddr(plane->bo);
		plane->paddr = 0;
	}

	mutex_unlock(&omap_fb->lock);

	return ret;
}

/* unpin, no longer being scanned out: */
void omap_framebuffer_unpin(struct drm_framebuffer *fb)
{
	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
	int i, n = fb->format->num_planes;

	mutex_lock(&omap_fb->lock);

	omap_fb->pin_count--;

	if (omap_fb->pin_count > 0) {
		mutex_unlock(&omap_fb->lock);
		return;
	}

	for (i = 0; i < n; i++) {
		struct plane *plane = &omap_fb->planes[i];
		omap_gem_put_paddr(plane->bo);
		plane->paddr = 0;
	}

	mutex_unlock(&omap_fb->lock);
}

/* iterate thru all the connectors, returning ones that are attached
 * to the same fb..
 */
struct drm_connector *omap_framebuffer_get_next_connector(
		struct drm_framebuffer *fb, struct drm_connector *from)
{
	struct drm_device *dev = fb->dev;
	struct list_head *connector_list = &dev->mode_config.connector_list;
	struct drm_connector *connector = from;

	if (!from)
		return list_first_entry_or_null(connector_list, typeof(*from),
						head);

	list_for_each_entry_from(connector, connector_list, head) {
		if (connector != from) {
			struct drm_encoder *encoder = connector->encoder;
			struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
			if (crtc && crtc->primary->fb == fb)
				return connector;

		}
	}

	return NULL;
}

#ifdef CONFIG_DEBUG_FS
void omap_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
{
	struct omap_framebuffer *omap_fb = to_omap_framebuffer(fb);
	int i, n = fb->format->num_planes;

	seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
			(char *)&fb->format->format);

	for (i = 0; i < n; i++) {
		struct plane *plane = &omap_fb->planes[i];
		seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
				i, plane->offset, plane->pitch);
		omap_gem_describe(plane->bo, m);
	}
}
#endif

struct drm_framebuffer *omap_framebuffer_create(struct drm_device *dev,
		struct drm_file *file, const struct drm_mode_fb_cmd2 *mode_cmd)
{
	struct drm_gem_object *bos[4];
	struct drm_framebuffer *fb;
	int ret;

	ret = objects_lookup(file, mode_cmd->pixel_format,
			bos, mode_cmd->handles);
	if (ret)
		return ERR_PTR(ret);

	fb = omap_framebuffer_init(dev, mode_cmd, bos);
	if (IS_ERR(fb)) {
		int i, n = drm_format_num_planes(mode_cmd->pixel_format);
		for (i = 0; i < n; i++)
			drm_gem_object_unreference_unlocked(bos[i]);
		return fb;
	}
	return fb;
}

struct drm_framebuffer *omap_framebuffer_init(struct drm_device *dev,
		const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **bos)
{
	struct omap_framebuffer *omap_fb = NULL;
	struct drm_framebuffer *fb = NULL;
	const struct format *format = NULL;
	int ret, i, n = drm_format_num_planes(mode_cmd->pixel_format);

	DBG("create framebuffer: dev=%p, mode_cmd=%p (%dx%d@%4.4s)",
			dev, mode_cmd, mode_cmd->width, mode_cmd->height,
			(char *)&mode_cmd->pixel_format);

	for (i = 0; i < ARRAY_SIZE(formats); i++) {
		if (formats[i].pixel_format == mode_cmd->pixel_format) {
			format = &formats[i];
			break;
		}
	}

	if (!format) {
		dev_err(dev->dev, "unsupported pixel format: %4.4s\n",
				(char *)&mode_cmd->pixel_format);
		ret = -EINVAL;
		goto fail;
	}

	omap_fb = kzalloc(sizeof(*omap_fb), GFP_KERNEL);
	if (!omap_fb) {
		ret = -ENOMEM;
		goto fail;
	}

	fb = &omap_fb->base;
	omap_fb->format = format;
	mutex_init(&omap_fb->lock);

	for (i = 0; i < n; i++) {
		struct plane *plane = &omap_fb->planes[i];
		int size, pitch = mode_cmd->pitches[i];

		if (pitch < (mode_cmd->width * format->planes[i].stride_bpp)) {
			dev_err(dev->dev, "provided buffer pitch is too small! %d < %d\n",
					pitch, mode_cmd->width * format->planes[i].stride_bpp);
			ret = -EINVAL;
			goto fail;
		}

		if (pitch % format->planes[i].stride_bpp != 0) {
			dev_err(dev->dev,
				"buffer pitch (%d bytes) is not a multiple of pixel size (%d bytes)\n",
				pitch, format->planes[i].stride_bpp);
			ret = -EINVAL;
			goto fail;
		}

		size = pitch * mode_cmd->height / format->planes[i].sub_y;

		if (size > (omap_gem_mmap_size(bos[i]) - mode_cmd->offsets[i])) {
			dev_err(dev->dev, "provided buffer object is too small! %d < %d\n",
					bos[i]->size - mode_cmd->offsets[i], size);
			ret = -EINVAL;
			goto fail;
		}

		if (i > 0 && pitch != mode_cmd->pitches[i - 1]) {
			dev_err(dev->dev,
				"pitches are not the same between framebuffer planes %d != %d\n",
				pitch, mode_cmd->pitches[i - 1]);
			ret = -EINVAL;
			goto fail;
		}

		plane->bo     = bos[i];
		plane->offset = mode_cmd->offsets[i];
		plane->pitch  = pitch;
		plane->paddr  = 0;
	}

	drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);

	ret = drm_framebuffer_init(dev, fb, &omap_framebuffer_funcs);
	if (ret) {
		dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
		goto fail;
	}

	DBG("create: FB ID: %d (%p)", fb->base.id, fb);

	return fb;

fail:
	kfree(omap_fb);

	return ERR_PTR(ret);
}