drivers/gpu/drm/mgag200/mgag200_cursor.c - kernel/quantenna - Git at Google

 /*
  * Copyright 2013 Matrox Graphics
  *
  * This file is subject to the terms and conditions of the GNU General
  * Public License version 2. See the file COPYING in the main
  * directory of this archive for more details.
  *
  * Author: Christopher Harvey <charvey@matrox.com>
  */

 #include <drm/drmP.h>
 #include "mgag200_drv.h"

 static bool warn_transparent = true;
 static bool warn_palette = true;

 /*
   Hide the cursor off screen. We can't disable the cursor hardware because it
   takes too long to re-activate and causes momentary corruption
 */
 static void mga_hide_cursor(struct mga_device *mdev)
 {
 	WREG8(MGA_CURPOSXL, 0);
 	WREG8(MGA_CURPOSXH, 0);
 	if (mdev->cursor.pixels_1->pin_count)
 		mgag200_bo_unpin(mdev->cursor.pixels_1);
 	if (mdev->cursor.pixels_2->pin_count)
 		mgag200_bo_unpin(mdev->cursor.pixels_2);
 }

 int mga_crtc_cursor_set(struct drm_crtc *crtc,
 			struct drm_file *file_priv,
 			uint32_t handle,
 			uint32_t width,
 			uint32_t height)
 {
 	struct drm_device *dev = crtc->dev;
 	struct mga_device *mdev = (struct mga_device *)dev->dev_private;
 	struct mgag200_bo *pixels_1 = mdev->cursor.pixels_1;
 	struct mgag200_bo *pixels_2 = mdev->cursor.pixels_2;
 	struct mgag200_bo *pixels_current = mdev->cursor.pixels_current;
 	struct mgag200_bo *pixels_prev = mdev->cursor.pixels_prev;
 	struct drm_gem_object *obj;
 	struct mgag200_bo *bo = NULL;
 	int ret = 0;
 	unsigned int i, row, col;
 	uint32_t colour_set[16];
 	uint32_t *next_space = &colour_set[0];
 	uint32_t *palette_iter;
 	uint32_t this_colour;
 	bool found = false;
 	int colour_count = 0;
 	u64 gpu_addr;
 	u8 reg_index;
 	u8 this_row[48];

 	if (!pixels_1 || !pixels_2) {
 		WREG8(MGA_CURPOSXL, 0);
 		WREG8(MGA_CURPOSXH, 0);
 		return -ENOTSUPP; /* Didn't allocate space for cursors */
 	}

 	if ((width != 64 || height != 64) && handle) {
 		WREG8(MGA_CURPOSXL, 0);
 		WREG8(MGA_CURPOSXH, 0);
 		return -EINVAL;
 	}

 	BUG_ON(pixels_1 != pixels_current && pixels_1 != pixels_prev);
 	BUG_ON(pixels_2 != pixels_current && pixels_2 != pixels_prev);
 	BUG_ON(pixels_current == pixels_prev);

 	if (!handle || !file_priv) {
 		mga_hide_cursor(mdev);
 		return 0;
 	}

 	obj = drm_gem_object_lookup(file_priv, handle);
 	if (!obj)
 		return -ENOENT;

 	ret = mgag200_bo_reserve(pixels_1, true);
 	if (ret) {
 		WREG8(MGA_CURPOSXL, 0);
 		WREG8(MGA_CURPOSXH, 0);
 		goto out_unref;
 	}
 	ret = mgag200_bo_reserve(pixels_2, true);
 	if (ret) {
 		WREG8(MGA_CURPOSXL, 0);
 		WREG8(MGA_CURPOSXH, 0);
 		mgag200_bo_unreserve(pixels_1);
 		goto out_unreserve1;
 	}

 	/* Move cursor buffers into VRAM if they aren't already */
 	if (!pixels_1->pin_count) {
 		ret = mgag200_bo_pin(pixels_1, TTM_PL_FLAG_VRAM,
 				     &mdev->cursor.pixels_1_gpu_addr);
 		if (ret)
 			goto out1;
 	}
 	if (!pixels_2->pin_count) {
 		ret = mgag200_bo_pin(pixels_2, TTM_PL_FLAG_VRAM,
 				     &mdev->cursor.pixels_2_gpu_addr);
 		if (ret) {
 			mgag200_bo_unpin(pixels_1);
 			goto out1;
 		}
 	}

 	bo = gem_to_mga_bo(obj);
 	ret = mgag200_bo_reserve(bo, true);
 	if (ret) {
 		dev_err(&dev->pdev->dev, "failed to reserve user bo\n");
 		goto out1;
 	}
 	if (!bo->kmap.virtual) {
 		ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
 		if (ret) {
 			dev_err(&dev->pdev->dev, "failed to kmap user buffer updates\n");
 			goto out2;
 		}
 	}

 	memset(&colour_set[0], 0, sizeof(uint32_t)*16);
 	/* width*height*4 = 16384 */
 	for (i = 0; i < 16384; i += 4) {
 		this_colour = ioread32(bo->kmap.virtual + i);
 		/* No transparency */
 		if (this_colour>>24 != 0xff &&
 			this_colour>>24 != 0x0) {
 			if (warn_transparent) {
 				dev_info(&dev->pdev->dev, "Video card doesn't support cursors with partial transparency.\n");
 				dev_info(&dev->pdev->dev, "Not enabling hardware cursor.\n");
 				warn_transparent = false; /* Only tell the user once. */
 			}
 			ret = -EINVAL;
 			goto out3;
 		}
 		/* Don't need to store transparent pixels as colours */
 		if (this_colour>>24 == 0x0)
 			continue;
 		found = false;
 		for (palette_iter = &colour_set[0]; palette_iter != next_space; palette_iter++) {
 			if (*palette_iter == this_colour) {
 				found = true;
 				break;
 			}
 		}
 		if (found)
 			continue;
 		/* We only support 4bit paletted cursors */
 		if (colour_count >= 16) {
 			if (warn_palette) {
 				dev_info(&dev->pdev->dev, "Video card only supports cursors with up to 16 colours.\n");
 				dev_info(&dev->pdev->dev, "Not enabling hardware cursor.\n");
 				warn_palette = false; /* Only tell the user once. */
 			}
 			ret = -EINVAL;
 			goto out3;
 		}
 		*next_space = this_colour;
 		next_space++;
 		colour_count++;
 	}

 	/* Program colours from cursor icon into palette */
 	for (i = 0; i < colour_count; i++) {
 		if (i <= 2)
 			reg_index = 0x8 + i*0x4;
 		else
 			reg_index = 0x60 + i*0x3;
 		WREG_DAC(reg_index, colour_set[i] & 0xff);
 		WREG_DAC(reg_index+1, colour_set[i]>>8 & 0xff);
 		WREG_DAC(reg_index+2, colour_set[i]>>16 & 0xff);
 		BUG_ON((colour_set[i]>>24 & 0xff) != 0xff);
 	}

 	/* Map up-coming buffer to write colour indices */
 	if (!pixels_prev->kmap.virtual) {
 		ret = ttm_bo_kmap(&pixels_prev->bo, 0,
 				  pixels_prev->bo.num_pages,
 				  &pixels_prev->kmap);
 		if (ret) {
 			dev_err(&dev->pdev->dev, "failed to kmap cursor updates\n");
 			goto out3;
 		}
 	}

 	/* now write colour indices into hardware cursor buffer */
 	for (row = 0; row < 64; row++) {
 		memset(&this_row[0], 0, 48);
 		for (col = 0; col < 64; col++) {
 			this_colour = ioread32(bo->kmap.virtual + 4*(col + 64*row));
 			/* write transparent pixels */
 			if (this_colour>>24 == 0x0) {
 				this_row[47 - col/8] |= 0x80>>(col%8);
 				continue;
 			}

 			/* write colour index here */
 			for (i = 0; i < colour_count; i++) {
 				if (colour_set[i] == this_colour) {
 					if (col % 2)
 						this_row[col/2] |= i<<4;
 					else
 						this_row[col/2] |= i;
 					break;
 				}
 			}
 		}
 		memcpy_toio(pixels_prev->kmap.virtual + row*48, &this_row[0], 48);
 	}

 	/* Program gpu address of cursor buffer */
 	if (pixels_prev == pixels_1)
 		gpu_addr = mdev->cursor.pixels_1_gpu_addr;
 	else
 		gpu_addr = mdev->cursor.pixels_2_gpu_addr;
 	WREG_DAC(MGA1064_CURSOR_BASE_ADR_LOW, (u8)((gpu_addr>>10) & 0xff));
 	WREG_DAC(MGA1064_CURSOR_BASE_ADR_HI, (u8)((gpu_addr>>18) & 0x3f));

 	/* Adjust cursor control register to turn on the cursor */
 	WREG_DAC(MGA1064_CURSOR_CTL, 4); /* 16-colour palletized cursor mode */

 	/* Now swap internal buffer pointers */
 	if (mdev->cursor.pixels_1 == mdev->cursor.pixels_prev) {
 		mdev->cursor.pixels_prev = mdev->cursor.pixels_2;
 		mdev->cursor.pixels_current = mdev->cursor.pixels_1;
 	} else if (mdev->cursor.pixels_1 == mdev->cursor.pixels_current) {
 		mdev->cursor.pixels_prev = mdev->cursor.pixels_1;
 		mdev->cursor.pixels_current = mdev->cursor.pixels_2;
 	} else {
 		BUG();
 	}
 	ret = 0;

 	ttm_bo_kunmap(&pixels_prev->kmap);
  out3:
 	ttm_bo_kunmap(&bo->kmap);
  out2:
 	mgag200_bo_unreserve(bo);
  out1:
 	if (ret)
 		mga_hide_cursor(mdev);
 	mgag200_bo_unreserve(pixels_1);
 out_unreserve1:
 	mgag200_bo_unreserve(pixels_2);
 out_unref:
 	drm_gem_object_unreference_unlocked(obj);

 	return ret;
 }

 int mga_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
 {
 	struct mga_device *mdev = (struct mga_device *)crtc->dev->dev_private;
 	/* Our origin is at (64,64) */
 	x += 64;
 	y += 64;

 	BUG_ON(x <= 0);
 	BUG_ON(y <= 0);
 	BUG_ON(x & ~0xffff);
 	BUG_ON(y & ~0xffff);

 	WREG8(MGA_CURPOSXL, x & 0xff);
 	WREG8(MGA_CURPOSXH, (x>>8) & 0xff);

 	WREG8(MGA_CURPOSYL, y & 0xff);
 	WREG8(MGA_CURPOSYH, (y>>8) & 0xff);
 	return 0;
 }
	/*
	* Copyright 2013 Matrox Graphics
	*
	* This file is subject to the terms and conditions of the GNU General
	* Public License version 2. See the file COPYING in the main
	* directory of this archive for more details.
	*
	* Author: Christopher Harvey <charvey@matrox.com>
	*/

	#include <drm/drmP.h>
	#include "mgag200_drv.h"

	static bool warn_transparent = true;
	static bool warn_palette = true;

	/*
	Hide the cursor off screen. We can't disable the cursor hardware because it
	takes too long to re-activate and causes momentary corruption
	*/
	static void mga_hide_cursor(struct mga_device *mdev)
	{
	WREG8(MGA_CURPOSXL, 0);
	WREG8(MGA_CURPOSXH, 0);
	if (mdev->cursor.pixels_1->pin_count)
	mgag200_bo_unpin(mdev->cursor.pixels_1);
	if (mdev->cursor.pixels_2->pin_count)
	mgag200_bo_unpin(mdev->cursor.pixels_2);
	}

	int mga_crtc_cursor_set(struct drm_crtc *crtc,
	struct drm_file *file_priv,
	uint32_t handle,
	uint32_t width,
	uint32_t height)
	{
	struct drm_device *dev = crtc->dev;
	struct mga_device mdev = (struct mga_device )dev->dev_private;
	struct mgag200_bo *pixels_1 = mdev->cursor.pixels_1;
	struct mgag200_bo *pixels_2 = mdev->cursor.pixels_2;
	struct mgag200_bo *pixels_current = mdev->cursor.pixels_current;
	struct mgag200_bo *pixels_prev = mdev->cursor.pixels_prev;
	struct drm_gem_object *obj;
	struct mgag200_bo *bo = NULL;
	int ret = 0;
	unsigned int i, row, col;
	uint32_t colour_set[16];
	uint32_t *next_space = &colour_set[0];
	uint32_t *palette_iter;
	uint32_t this_colour;
	bool found = false;
	int colour_count = 0;
	u64 gpu_addr;
	u8 reg_index;
	u8 this_row[48];

	if (!pixels_1 \|\| !pixels_2) {
	WREG8(MGA_CURPOSXL, 0);
	WREG8(MGA_CURPOSXH, 0);
	return -ENOTSUPP; /* Didn't allocate space for cursors */
	}

	if ((width != 64 \|\| height != 64) && handle) {
	WREG8(MGA_CURPOSXL, 0);
	WREG8(MGA_CURPOSXH, 0);
	return -EINVAL;
	}

	BUG_ON(pixels_1 != pixels_current && pixels_1 != pixels_prev);
	BUG_ON(pixels_2 != pixels_current && pixels_2 != pixels_prev);
	BUG_ON(pixels_current == pixels_prev);

	if (!handle \|\| !file_priv) {
	mga_hide_cursor(mdev);
	return 0;
	}

	obj = drm_gem_object_lookup(file_priv, handle);
	if (!obj)
	return -ENOENT;

	ret = mgag200_bo_reserve(pixels_1, true);
	if (ret) {
	WREG8(MGA_CURPOSXL, 0);
	WREG8(MGA_CURPOSXH, 0);
	goto out_unref;
	}
	ret = mgag200_bo_reserve(pixels_2, true);
	if (ret) {
	WREG8(MGA_CURPOSXL, 0);
	WREG8(MGA_CURPOSXH, 0);
	mgag200_bo_unreserve(pixels_1);
	goto out_unreserve1;
	}

	/* Move cursor buffers into VRAM if they aren't already */
	if (!pixels_1->pin_count) {
	ret = mgag200_bo_pin(pixels_1, TTM_PL_FLAG_VRAM,
	&mdev->cursor.pixels_1_gpu_addr);
	if (ret)
	goto out1;
	}
	if (!pixels_2->pin_count) {
	ret = mgag200_bo_pin(pixels_2, TTM_PL_FLAG_VRAM,
	&mdev->cursor.pixels_2_gpu_addr);
	if (ret) {
	mgag200_bo_unpin(pixels_1);
	goto out1;
	}
	}

	bo = gem_to_mga_bo(obj);
	ret = mgag200_bo_reserve(bo, true);
	if (ret) {
	dev_err(&dev->pdev->dev, "failed to reserve user bo\n");
	goto out1;
	}
	if (!bo->kmap.virtual) {
	ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
	if (ret) {
	dev_err(&dev->pdev->dev, "failed to kmap user buffer updates\n");
	goto out2;
	}
	}

	memset(&colour_set[0], 0, sizeof(uint32_t)*16);
	/* widthheight4 = 16384 */
	for (i = 0; i < 16384; i += 4) {
	this_colour = ioread32(bo->kmap.virtual + i);
	/* No transparency */
	if (this_colour>>24 != 0xff &&
	this_colour>>24 != 0x0) {
	if (warn_transparent) {
	dev_info(&dev->pdev->dev, "Video card doesn't support cursors with partial transparency.\n");
	dev_info(&dev->pdev->dev, "Not enabling hardware cursor.\n");
	warn_transparent = false; /* Only tell the user once. */
	}
	ret = -EINVAL;
	goto out3;
	}
	/* Don't need to store transparent pixels as colours */
	if (this_colour>>24 == 0x0)
	continue;
	found = false;
	for (palette_iter = &colour_set[0]; palette_iter != next_space; palette_iter++) {
	if (*palette_iter == this_colour) {
	found = true;
	break;
	}
	}
	if (found)
	continue;
	/* We only support 4bit paletted cursors */
	if (colour_count >= 16) {
	if (warn_palette) {
	dev_info(&dev->pdev->dev, "Video card only supports cursors with up to 16 colours.\n");
	dev_info(&dev->pdev->dev, "Not enabling hardware cursor.\n");
	warn_palette = false; /* Only tell the user once. */
	}
	ret = -EINVAL;
	goto out3;
	}
	*next_space = this_colour;
	next_space++;
	colour_count++;
	}

	/* Program colours from cursor icon into palette */
	for (i = 0; i < colour_count; i++) {
	if (i <= 2)
	reg_index = 0x8 + i*0x4;
	else
	reg_index = 0x60 + i*0x3;
	WREG_DAC(reg_index, colour_set[i] & 0xff);
	WREG_DAC(reg_index+1, colour_set[i]>>8 & 0xff);
	WREG_DAC(reg_index+2, colour_set[i]>>16 & 0xff);
	BUG_ON((colour_set[i]>>24 & 0xff) != 0xff);
	}

	/* Map up-coming buffer to write colour indices */
	if (!pixels_prev->kmap.virtual) {
	ret = ttm_bo_kmap(&pixels_prev->bo, 0,
	pixels_prev->bo.num_pages,
	&pixels_prev->kmap);
	if (ret) {
	dev_err(&dev->pdev->dev, "failed to kmap cursor updates\n");
	goto out3;
	}
	}

	/* now write colour indices into hardware cursor buffer */
	for (row = 0; row < 64; row++) {
	memset(&this_row[0], 0, 48);
	for (col = 0; col < 64; col++) {
	this_colour = ioread32(bo->kmap.virtual + 4(col + 64row));
	/* write transparent pixels */
	if (this_colour>>24 == 0x0) {
	this_row[47 - col/8] \|= 0x80>>(col%8);
	continue;
	}

	/* write colour index here */
	for (i = 0; i < colour_count; i++) {
	if (colour_set[i] == this_colour) {
	if (col % 2)
	this_row[col/2] \|= i<<4;
	else
	this_row[col/2] \|= i;
	break;
	}
	}
	}
	memcpy_toio(pixels_prev->kmap.virtual + row*48, &this_row[0], 48);
	}

	/* Program gpu address of cursor buffer */
	if (pixels_prev == pixels_1)
	gpu_addr = mdev->cursor.pixels_1_gpu_addr;
	else
	gpu_addr = mdev->cursor.pixels_2_gpu_addr;
	WREG_DAC(MGA1064_CURSOR_BASE_ADR_LOW, (u8)((gpu_addr>>10) & 0xff));
	WREG_DAC(MGA1064_CURSOR_BASE_ADR_HI, (u8)((gpu_addr>>18) & 0x3f));

	/* Adjust cursor control register to turn on the cursor */
	WREG_DAC(MGA1064_CURSOR_CTL, 4); /* 16-colour palletized cursor mode */

	/* Now swap internal buffer pointers */
	if (mdev->cursor.pixels_1 == mdev->cursor.pixels_prev) {
	mdev->cursor.pixels_prev = mdev->cursor.pixels_2;
	mdev->cursor.pixels_current = mdev->cursor.pixels_1;
	} else if (mdev->cursor.pixels_1 == mdev->cursor.pixels_current) {
	mdev->cursor.pixels_prev = mdev->cursor.pixels_1;
	mdev->cursor.pixels_current = mdev->cursor.pixels_2;
	} else {
	BUG();
	}
	ret = 0;

	ttm_bo_kunmap(&pixels_prev->kmap);
	out3:
	ttm_bo_kunmap(&bo->kmap);
	out2:
	mgag200_bo_unreserve(bo);
	out1:
	if (ret)
	mga_hide_cursor(mdev);
	mgag200_bo_unreserve(pixels_1);
	out_unreserve1:
	mgag200_bo_unreserve(pixels_2);
	out_unref:
	drm_gem_object_unreference_unlocked(obj);

	return ret;
	}

	int mga_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
	{
	struct mga_device mdev = (struct mga_device )crtc->dev->dev_private;
	/* Our origin is at (64,64) */
	x += 64;
	y += 64;

	BUG_ON(x <= 0);
	BUG_ON(y <= 0);
	BUG_ON(x & ~0xffff);
	BUG_ON(y & ~0xffff);

	WREG8(MGA_CURPOSXL, x & 0xff);
	WREG8(MGA_CURPOSXH, (x>>8) & 0xff);

	WREG8(MGA_CURPOSYL, y & 0xff);
	WREG8(MGA_CURPOSYH, (y>>8) & 0xff);
	return 0;
	}