kernel/drivers/gpu/drm/mgag200/mgag200_cursor.c

   1 /*
   2  * Copyright 2013 Matrox Graphics
   3  *
   4  * This file is subject to the terms and conditions of the GNU General
   5  * Public License version 2. See the file COPYING in the main
   6  * directory of this archive for more details.
   7  *
   8  * Author: Christopher Harvey <charvey@matrox.com>
   9  */
  10
  11 #include <drm/drmP.h>
  12 #include "mgag200_drv.h"
  13
  14 static bool warn_transparent = true;
  15 static bool warn_palette = true;
  16
  17 /*
  18   Hide the cursor off screen. We can't disable the cursor hardware because it
  19   takes too long to re-activate and causes momentary corruption
  20 */
  21 static void mga_hide_cursor(struct mga_device *mdev)
  22 {
  23         WREG8(MGA_CURPOSXL, 0);
  24         WREG8(MGA_CURPOSXH, 0);
  25         if (mdev->cursor.pixels_1->pin_count)
  26                 mgag200_bo_unpin(mdev->cursor.pixels_1);
  27         if (mdev->cursor.pixels_2->pin_count)
  28                 mgag200_bo_unpin(mdev->cursor.pixels_2);
  29 }
  30
  31 int mga_crtc_cursor_set(struct drm_crtc *crtc,
  32                         struct drm_file *file_priv,
  33                         uint32_t handle,
  34                         uint32_t width,
  35                         uint32_t height)
  36 {
  37         struct drm_device *dev = crtc->dev;
  38         struct mga_device *mdev = (struct mga_device *)dev->dev_private;
  39         struct mgag200_bo *pixels_1 = mdev->cursor.pixels_1;
  40         struct mgag200_bo *pixels_2 = mdev->cursor.pixels_2;
  41         struct mgag200_bo *pixels_current = mdev->cursor.pixels_current;
  42         struct mgag200_bo *pixels_prev = mdev->cursor.pixels_prev;
  43         struct drm_gem_object *obj;
  44         struct mgag200_bo *bo = NULL;
  45         int ret = 0;
  46         unsigned int i, row, col;
  47         uint32_t colour_set[16];
  48         uint32_t *next_space = &colour_set[0];
  49         uint32_t *palette_iter;
  50         uint32_t this_colour;
  51         bool found = false;
  52         int colour_count = 0;
  53         u64 gpu_addr;
  54         u8 reg_index;
  55         u8 this_row[48];
  56
  57         if (!pixels_1 || !pixels_2) {
  58                 WREG8(MGA_CURPOSXL, 0);
  59                 WREG8(MGA_CURPOSXH, 0);
  60                 return -ENOTSUPP; /* Didn't allocate space for cursors */
  61         }
  62
  63         if ((width != 64 || height != 64) && handle) {
  64                 WREG8(MGA_CURPOSXL, 0);
  65                 WREG8(MGA_CURPOSXH, 0);
  66                 return -EINVAL;
  67         }
  68
  69         BUG_ON(pixels_1 != pixels_current && pixels_1 != pixels_prev);
  70         BUG_ON(pixels_2 != pixels_current && pixels_2 != pixels_prev);
  71         BUG_ON(pixels_current == pixels_prev);
  72
  73         ret = mgag200_bo_reserve(pixels_1, true);
  74         if (ret) {
  75                 WREG8(MGA_CURPOSXL, 0);
  76                 WREG8(MGA_CURPOSXH, 0);
  77                 return ret;
  78         }
  79         ret = mgag200_bo_reserve(pixels_2, true);
  80         if (ret) {
  81                 WREG8(MGA_CURPOSXL, 0);
  82                 WREG8(MGA_CURPOSXH, 0);
  83                 mgag200_bo_unreserve(pixels_1);
  84                 return ret;
  85         }
  86
  87         if (!handle) {
  88                 mga_hide_cursor(mdev);
  89                 ret = 0;
  90                 goto out1;
  91         }
  92
  93         /* Move cursor buffers into VRAM if they aren't already */
  94         if (!pixels_1->pin_count) {
  95                 ret = mgag200_bo_pin(pixels_1, TTM_PL_FLAG_VRAM,
  96                                      &mdev->cursor.pixels_1_gpu_addr);
  97                 if (ret)
  98                         goto out1;
  99         }
 100         if (!pixels_2->pin_count) {
 101                 ret = mgag200_bo_pin(pixels_2, TTM_PL_FLAG_VRAM,
 102                                      &mdev->cursor.pixels_2_gpu_addr);
 103                 if (ret) {
 104                         mgag200_bo_unpin(pixels_1);
 105                         goto out1;
 106                 }
 107         }
 108
 109         mutex_lock(&dev->struct_mutex);
 110         obj = drm_gem_object_lookup(dev, file_priv, handle);
 111         if (!obj) {
 112                 mutex_unlock(&dev->struct_mutex);
 113                 ret = -ENOENT;
 114                 goto out1;
 115         }
 116         drm_gem_object_unreference(obj);
 117         mutex_unlock(&dev->struct_mutex);
 118
 119         bo = gem_to_mga_bo(obj);
 120         ret = mgag200_bo_reserve(bo, true);
 121         if (ret) {
 122                 dev_err(&dev->pdev->dev, "failed to reserve user bo\n");
 123                 goto out1;
 124         }
 125         if (!bo->kmap.virtual) {
 126                 ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
 127                 if (ret) {
 128                         dev_err(&dev->pdev->dev, "failed to kmap user buffer updates\n");
 129                         goto out2;
 130                 }
 131         }
 132
 133         memset(&colour_set[0], 0, sizeof(uint32_t)*16);
 134         /* width*height*4 = 16384 */
 135         for (i = 0; i < 16384; i += 4) {
 136                 this_colour = ioread32(bo->kmap.virtual + i);
 137                 /* No transparency */
 138                 if (this_colour>>24 != 0xff &&
 139                         this_colour>>24 != 0x0) {
 140                         if (warn_transparent) {
 141                                 dev_info(&dev->pdev->dev, "Video card doesn't support cursors with partial transparency.\n");
 142                                 dev_info(&dev->pdev->dev, "Not enabling hardware cursor.\n");
 143                                 warn_transparent = false; /* Only tell the user once. */
 144                         }
 145                         ret = -EINVAL;
 146                         goto out3;
 147                 }
 148                 /* Don't need to store transparent pixels as colours */
 149                 if (this_colour>>24 == 0x0)
 150                         continue;
 151                 found = false;
 152                 for (palette_iter = &colour_set[0]; palette_iter != next_space; palette_iter++) {
 153                         if (*palette_iter == this_colour) {
 154                                 found = true;
 155                                 break;
 156                         }
 157                 }
 158                 if (found)
 159                         continue;
 160                 /* We only support 4bit paletted cursors */
 161                 if (colour_count >= 16) {
 162                         if (warn_palette) {
 163                                 dev_info(&dev->pdev->dev, "Video card only supports cursors with up to 16 colours.\n");
 164                                 dev_info(&dev->pdev->dev, "Not enabling hardware cursor.\n");
 165                                 warn_palette = false; /* Only tell the user once. */
 166                         }
 167                         ret = -EINVAL;
 168                         goto out3;
 169                 }
 170                 *next_space = this_colour;
 171                 next_space++;
 172                 colour_count++;
 173         }
 174
 175         /* Program colours from cursor icon into palette */
 176         for (i = 0; i < colour_count; i++) {
 177                 if (i <= 2)
 178                         reg_index = 0x8 + i*0x4;
 179                 else
 180                         reg_index = 0x60 + i*0x3;
 181                 WREG_DAC(reg_index, colour_set[i] & 0xff);
 182                 WREG_DAC(reg_index+1, colour_set[i]>>8 & 0xff);
 183                 WREG_DAC(reg_index+2, colour_set[i]>>16 & 0xff);
 184                 BUG_ON((colour_set[i]>>24 & 0xff) != 0xff);
 185         }
 186
 187         /* Map up-coming buffer to write colour indices */
 188         if (!pixels_prev->kmap.virtual) {
 189                 ret = ttm_bo_kmap(&pixels_prev->bo, 0,
 190                                   pixels_prev->bo.num_pages,
 191                                   &pixels_prev->kmap);
 192                 if (ret) {
 193                         dev_err(&dev->pdev->dev, "failed to kmap cursor updates\n");
 194                         goto out3;
 195                 }
 196         }
 197
 198         /* now write colour indices into hardware cursor buffer */
 199         for (row = 0; row < 64; row++) {
 200                 memset(&this_row[0], 0, 48);
 201                 for (col = 0; col < 64; col++) {
 202                         this_colour = ioread32(bo->kmap.virtual + 4*(col + 64*row));
 203                         /* write transparent pixels */
 204                         if (this_colour>>24 == 0x0) {
 205                                 this_row[47 - col/8] |= 0x80>>(col%8);
 206                                 continue;
 207                         }
 208
 209                         /* write colour index here */
 210                         for (i = 0; i < colour_count; i++) {
 211                                 if (colour_set[i] == this_colour) {
 212                                         if (col % 2)
 213                                                 this_row[col/2] |= i<<4;
 214                                         else
 215                                                 this_row[col/2] |= i;
 216                                         break;
 217                                 }
 218                         }
 219                 }
 220                 memcpy_toio(pixels_prev->kmap.virtual + row*48, &this_row[0], 48);
 221         }
 222
 223         /* Program gpu address of cursor buffer */
 224         if (pixels_prev == pixels_1)
 225                 gpu_addr = mdev->cursor.pixels_1_gpu_addr;
 226         else
 227                 gpu_addr = mdev->cursor.pixels_2_gpu_addr;
 228         WREG_DAC(MGA1064_CURSOR_BASE_ADR_LOW, (u8)((gpu_addr>>10) & 0xff));
 229         WREG_DAC(MGA1064_CURSOR_BASE_ADR_HI, (u8)((gpu_addr>>18) & 0x3f));
 230
 231         /* Adjust cursor control register to turn on the cursor */
 232         WREG_DAC(MGA1064_CURSOR_CTL, 4); /* 16-colour palletized cursor mode */
 233
 234         /* Now swap internal buffer pointers */
 235         if (mdev->cursor.pixels_1 == mdev->cursor.pixels_prev) {
 236                 mdev->cursor.pixels_prev = mdev->cursor.pixels_2;
 237                 mdev->cursor.pixels_current = mdev->cursor.pixels_1;
 238         } else if (mdev->cursor.pixels_1 == mdev->cursor.pixels_current) {
 239                 mdev->cursor.pixels_prev = mdev->cursor.pixels_1;
 240                 mdev->cursor.pixels_current = mdev->cursor.pixels_2;
 241         } else {
 242                 BUG();
 243         }
 244         ret = 0;
 245
 246         ttm_bo_kunmap(&pixels_prev->kmap);
 247  out3:
 248         ttm_bo_kunmap(&bo->kmap);
 249  out2:
 250         mgag200_bo_unreserve(bo);
 251  out1:
 252         if (ret)
 253                 mga_hide_cursor(mdev);
 254         mgag200_bo_unreserve(pixels_1);
 255         mgag200_bo_unreserve(pixels_2);
 256         return ret;
 257 }
 258
 259 int mga_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)
 260 {
 261         struct mga_device *mdev = (struct mga_device *)crtc->dev->dev_private;
 262         /* Our origin is at (64,64) */
 263         x += 64;
 264         y += 64;
 265
 266         BUG_ON(x <= 0);
 267         BUG_ON(y <= 0);
 268         BUG_ON(x & ~0xffff);
 269         BUG_ON(y & ~0xffff);
 270
 271         WREG8(MGA_CURPOSXL, x & 0xff);
 272         WREG8(MGA_CURPOSXH, (x>>8) & 0xff);
 273
 274         WREG8(MGA_CURPOSYL, y & 0xff);
 275         WREG8(MGA_CURPOSYH, (y>>8) & 0xff);
 276         return 0;
 277 }