LXR linux/drivers/gpu/drm/mgag200/mgag200

   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
  14static bool warn_transparent = true;
  15static 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*/
  21static 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
  31int 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
 259int 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}
 278