/*
 * Copyright 2009 Ben Skeggs
 * Copyright 2008 Stuart Bennett
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "drmP.h"
#include "nouveau_drv.h"
#include "nouveau_dma.h"
#include "nouveau_fbcon.h"

static void
nv04_fbcon_copyarea(struct fb_info *info, const struct fb_copyarea *region)
{
	struct nouveau_fbcon_par *par = info->par;
	struct drm_device *dev = par->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_channel *chan = dev_priv->channel;

	if (info->state != FBINFO_STATE_RUNNING)
		return;

	if (!(info->flags & FBINFO_HWACCEL_DISABLED) && RING_SPACE(chan, 4)) {
		NV_ERROR(dev, "GPU lockup - switching to software fbcon\n");
		info->flags |= FBINFO_HWACCEL_DISABLED;
	}

	if (info->flags & FBINFO_HWACCEL_DISABLED) {
		cfb_copyarea(info, region);
		return;
	}

	BEGIN_RING(chan, NvSubImageBlit, 0x0300, 3);
	OUT_RING  (chan, (region->sy << 16) | region->sx);
	OUT_RING  (chan, (region->dy << 16) | region->dx);
	OUT_RING  (chan, (region->height << 16) | region->width);
	FIRE_RING (chan);
}

static void
nv04_fbcon_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
{
	struct nouveau_fbcon_par *par = info->par;
	struct drm_device *dev = par->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_channel *chan = dev_priv->channel;
	uint32_t color = ((uint32_t *) info->pseudo_palette)[rect->color];

	if (info->state != FBINFO_STATE_RUNNING)
		return;

	if (!(info->flags & FBINFO_HWACCEL_DISABLED) && RING_SPACE(chan, 7)) {
		NV_ERROR(dev, "GPU lockup - switching to software fbcon\n");
		info->flags |= FBINFO_HWACCEL_DISABLED;
	}

	if (info->flags & FBINFO_HWACCEL_DISABLED) {
		cfb_fillrect(info, rect);
		return;
	}

	BEGIN_RING(chan, NvSubGdiRect, 0x02fc, 1);
	OUT_RING  (chan, (rect->rop != ROP_COPY) ? 1 : 3);
	BEGIN_RING(chan, NvSubGdiRect, 0x03fc, 1);
	OUT_RING  (chan, color);
	BEGIN_RING(chan, NvSubGdiRect, 0x0400, 2);
	OUT_RING  (chan, (rect->dx << 16) | rect->dy);
	OUT_RING  (chan, (rect->width << 16) | rect->height);
	FIRE_RING (chan);
}

static void
nv04_fbcon_imageblit(struct fb_info *info, const struct fb_image *image)
{
	struct nouveau_fbcon_par *par = info->par;
	struct drm_device *dev = par->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_channel *chan = dev_priv->channel;
	uint32_t fg;
	uint32_t bg;
	uint32_t dsize;
	uint32_t width;
	uint32_t *data = (uint32_t *)image->data;

	if (info->state != FBINFO_STATE_RUNNING)
		return;

	if (image->depth != 1 || info->flags & FBINFO_HWACCEL_DISABLED) {
		cfb_imageblit(info, image);
		return;
	}

	if (RING_SPACE(chan, 8)) {
		NV_ERROR(dev, "GPU lockup - switching to software fbcon\n");
		info->flags |= FBINFO_HWACCEL_DISABLED;
		cfb_imageblit(info, image);
		return;
	}

	width = (image->width + 31) & ~31;
	dsize = (width * image->height) >> 5;

	fg = ((uint32_t *) info->pseudo_palette)[image->fg_color];
	bg = ((uint32_t *) info->pseudo_palette)[image->bg_color];

	BEGIN_RING(chan, NvSubGdiRect, 0x0be4, 7);
	OUT_RING  (chan, (image->dy << 16) | (image->dx & 0xffff));
	OUT_RING  (chan, ((image->dy + image->height) << 16) |
			 ((image->dx + image->width) & 0xffff));
	OUT_RING  (chan, bg);
	OUT_RING  (chan, fg);
	OUT_RING  (chan, (image->height << 16) | image->width);
	OUT_RING  (chan, (image->height << 16) | width);
	OUT_RING  (chan, (image->dy << 16) | (image->dx & 0xffff));

	while (dsize) {
		int iter_len = dsize > 128 ? 128 : dsize;

		if (RING_SPACE(chan, iter_len + 1)) {
			NV_ERROR(dev, "GPU lockup - switching to software fbcon\n");
			info->flags |= FBINFO_HWACCEL_DISABLED;
			cfb_imageblit(info, image);
			return;
		}

		BEGIN_RING(chan, NvSubGdiRect, 0x0c00, iter_len);
		OUT_RINGp(chan, data, iter_len);
		data += iter_len;
		dsize -= iter_len;
	}

	FIRE_RING (chan);
}

static int
nv04_fbcon_grobj_new(struct drm_device *dev, int class, uint32_t handle)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_gpuobj *obj = NULL;
	int ret;

	ret = nouveau_gpuobj_gr_new(dev_priv->channel, class, &obj);
	if (ret)
		return ret;

	ret = nouveau_gpuobj_ref_add(dev, dev_priv->channel, handle, obj, NULL);
	if (ret)
		return ret;

	return 0;
}

int
nv04_fbcon_accel_init(struct fb_info *info)
{
	struct nouveau_fbcon_par *par = info->par;
	struct drm_device *dev = par->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_channel *chan = dev_priv->channel;
	int surface_fmt, pattern_fmt, rect_fmt;
	int ret;

	ret = nv04_fbcon_grobj_new(dev, dev_priv->card_type >= NV_10 ?
				   0x0062 : 0x0042, NvCtxSurf2D);
	if (ret)
		return ret;

	ret = nv04_fbcon_grobj_new(dev, 0x0019, NvClipRect);
	if (ret)
		return ret;

	ret = nv04_fbcon_grobj_new(dev, 0x0043, NvRop);
	if (ret)
		return ret;

	ret = nv04_fbcon_grobj_new(dev, 0x0044, NvImagePatt);
	if (ret)
		return ret;

	ret = nv04_fbcon_grobj_new(dev, 0x004a, NvGdiRect);
	if (ret)
		return ret;

	ret = nv04_fbcon_grobj_new(dev, dev_priv->card_type >= NV_10 ?
				   0x009f : 0x005f, NvImageBlit);
	if (ret)
		return ret;

	switch (info->var.bits_per_pixel) {
	case 16:
		surface_fmt = 4;
		pattern_fmt = 1;
		rect_fmt = 1;
		break;
	default:
		surface_fmt = 6;
		pattern_fmt = 3;
		rect_fmt = 3;
		break;
	}

	if (RING_SPACE(chan, 49)) {
		NV_ERROR(dev, "GPU lockup - switching to software fbcon\n");
		info->flags |= FBINFO_HWACCEL_DISABLED;
		return 0;
	}

	BEGIN_RING(chan, 1, 0x0000, 1);
	OUT_RING  (chan, NvCtxSurf2D);
	BEGIN_RING(chan, 1, 0x0184, 2);
	OUT_RING  (chan, NvDmaFB);
	OUT_RING  (chan, NvDmaFB);
	BEGIN_RING(chan, 1, 0x0300, 4);
	OUT_RING  (chan, surface_fmt);
	OUT_RING  (chan, info->fix.line_length | (info->fix.line_length << 16));
	OUT_RING  (chan, info->fix.smem_start - dev->mode_config.fb_base);
	OUT_RING  (chan, info->fix.smem_start - dev->mode_config.fb_base);

	BEGIN_RING(chan, 1, 0x0000, 1);
	OUT_RING  (chan, NvRop);
	BEGIN_RING(chan, 1, 0x0300, 1);
	OUT_RING  (chan, 0x55);

	BEGIN_RING(chan, 1, 0x0000, 1);
	OUT_RING  (chan, NvImagePatt);
	BEGIN_RING(chan, 1, 0x0300, 8);
	OUT_RING  (chan, pattern_fmt);
#ifdef __BIG_ENDIAN
	OUT_RING  (chan, 2);
#else
	OUT_RING  (chan, 1);
#endif
	OUT_RING  (chan, 0);
	OUT_RING  (chan, 1);
	OUT_RING  (chan, ~0);
	OUT_RING  (chan, ~0);
	OUT_RING  (chan, ~0);
	OUT_RING  (chan, ~0);

	BEGIN_RING(chan, 1, 0x0000, 1);
	OUT_RING  (chan, NvClipRect);
	BEGIN_RING(chan, 1, 0x0300, 2);
	OUT_RING  (chan, 0);
	OUT_RING  (chan, (info->var.yres_virtual << 16) | info->var.xres_virtual);

	BEGIN_RING(chan, NvSubImageBlit, 0x0000, 1);
	OUT_RING  (chan, NvImageBlit);
	BEGIN_RING(chan, NvSubImageBlit, 0x019c, 1);
	OUT_RING  (chan, NvCtxSurf2D);
	BEGIN_RING(chan, NvSubImageBlit, 0x02fc, 1);
	OUT_RING  (chan, 3);

	BEGIN_RING(chan, NvSubGdiRect, 0x0000, 1);
	OUT_RING  (chan, NvGdiRect);
	BEGIN_RING(chan, NvSubGdiRect, 0x0198, 1);
	OUT_RING  (chan, NvCtxSurf2D);
	BEGIN_RING(chan, NvSubGdiRect, 0x0188, 2);
	OUT_RING  (chan, NvImagePatt);
	OUT_RING  (chan, NvRop);
	BEGIN_RING(chan, NvSubGdiRect, 0x0304, 1);
	OUT_RING  (chan, 1);
	BEGIN_RING(chan, NvSubGdiRect, 0x0300, 1);
	OUT_RING  (chan, rect_fmt);
	BEGIN_RING(chan, NvSubGdiRect, 0x02fc, 1);
	OUT_RING  (chan, 3);

	FIRE_RING (chan);

	info->fbops->fb_fillrect = nv04_fbcon_fillrect;
	info->fbops->fb_copyarea = nv04_fbcon_copyarea;
	info->fbops->fb_imageblit = nv04_fbcon_imageblit;
	return 0;
}

