linux/drivers/gpu/drm/mgag200/mgag200_fb.c
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   1/*
   2 * Copyright 2010 Matt Turner.
   3 * Copyright 2012 Red Hat
   4 *
   5 * This file is subject to the terms and conditions of the GNU General
   6 * Public License version 2. See the file COPYING in the main
   7 * directory of this archive for more details.
   8 *
   9 * Authors: Matthew Garrett
  10 *          Matt Turner
  11 *          Dave Airlie
  12 */
  13#include <linux/module.h>
  14#include <drm/drmP.h>
  15#include <drm/drm_fb_helper.h>
  16#include <drm/drm_crtc_helper.h>
  17
  18#include "mgag200_drv.h"
  19
  20static void mga_dirty_update(struct mga_fbdev *mfbdev,
  21                             int x, int y, int width, int height)
  22{
  23        int i;
  24        struct drm_gem_object *obj;
  25        struct mgag200_bo *bo;
  26        int src_offset, dst_offset;
  27        int bpp = mfbdev->mfb.base.format->cpp[0];
  28        int ret = -EBUSY;
  29        bool unmap = false;
  30        bool store_for_later = false;
  31        int x2, y2;
  32        unsigned long flags;
  33
  34        obj = mfbdev->mfb.obj;
  35        bo = gem_to_mga_bo(obj);
  36
  37        /*
  38         * try and reserve the BO, if we fail with busy
  39         * then the BO is being moved and we should
  40         * store up the damage until later.
  41         */
  42        if (drm_can_sleep())
  43                ret = mgag200_bo_reserve(bo, true);
  44        if (ret) {
  45                if (ret != -EBUSY)
  46                        return;
  47
  48                store_for_later = true;
  49        }
  50
  51        x2 = x + width - 1;
  52        y2 = y + height - 1;
  53        spin_lock_irqsave(&mfbdev->dirty_lock, flags);
  54
  55        if (mfbdev->y1 < y)
  56                y = mfbdev->y1;
  57        if (mfbdev->y2 > y2)
  58                y2 = mfbdev->y2;
  59        if (mfbdev->x1 < x)
  60                x = mfbdev->x1;
  61        if (mfbdev->x2 > x2)
  62                x2 = mfbdev->x2;
  63
  64        if (store_for_later) {
  65                mfbdev->x1 = x;
  66                mfbdev->x2 = x2;
  67                mfbdev->y1 = y;
  68                mfbdev->y2 = y2;
  69                spin_unlock_irqrestore(&mfbdev->dirty_lock, flags);
  70                return;
  71        }
  72
  73        mfbdev->x1 = mfbdev->y1 = INT_MAX;
  74        mfbdev->x2 = mfbdev->y2 = 0;
  75        spin_unlock_irqrestore(&mfbdev->dirty_lock, flags);
  76
  77        if (!bo->kmap.virtual) {
  78                ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
  79                if (ret) {
  80                        DRM_ERROR("failed to kmap fb updates\n");
  81                        mgag200_bo_unreserve(bo);
  82                        return;
  83                }
  84                unmap = true;
  85        }
  86        for (i = y; i <= y2; i++) {
  87                /* assume equal stride for now */
  88                src_offset = dst_offset = i * mfbdev->mfb.base.pitches[0] + (x * bpp);
  89                memcpy_toio(bo->kmap.virtual + src_offset, mfbdev->sysram + src_offset, (x2 - x + 1) * bpp);
  90
  91        }
  92        if (unmap)
  93                ttm_bo_kunmap(&bo->kmap);
  94
  95        mgag200_bo_unreserve(bo);
  96}
  97
  98static void mga_fillrect(struct fb_info *info,
  99                         const struct fb_fillrect *rect)
 100{
 101        struct mga_fbdev *mfbdev = info->par;
 102        drm_fb_helper_sys_fillrect(info, rect);
 103        mga_dirty_update(mfbdev, rect->dx, rect->dy, rect->width,
 104                         rect->height);
 105}
 106
 107static void mga_copyarea(struct fb_info *info,
 108                         const struct fb_copyarea *area)
 109{
 110        struct mga_fbdev *mfbdev = info->par;
 111        drm_fb_helper_sys_copyarea(info, area);
 112        mga_dirty_update(mfbdev, area->dx, area->dy, area->width,
 113                         area->height);
 114}
 115
 116static void mga_imageblit(struct fb_info *info,
 117                          const struct fb_image *image)
 118{
 119        struct mga_fbdev *mfbdev = info->par;
 120        drm_fb_helper_sys_imageblit(info, image);
 121        mga_dirty_update(mfbdev, image->dx, image->dy, image->width,
 122                         image->height);
 123}
 124
 125
 126static struct fb_ops mgag200fb_ops = {
 127        .owner = THIS_MODULE,
 128        .fb_check_var = drm_fb_helper_check_var,
 129        .fb_set_par = drm_fb_helper_set_par,
 130        .fb_fillrect = mga_fillrect,
 131        .fb_copyarea = mga_copyarea,
 132        .fb_imageblit = mga_imageblit,
 133        .fb_pan_display = drm_fb_helper_pan_display,
 134        .fb_blank = drm_fb_helper_blank,
 135        .fb_setcmap = drm_fb_helper_setcmap,
 136};
 137
 138static int mgag200fb_create_object(struct mga_fbdev *afbdev,
 139                                   const struct drm_mode_fb_cmd2 *mode_cmd,
 140                                   struct drm_gem_object **gobj_p)
 141{
 142        struct drm_device *dev = afbdev->helper.dev;
 143        u32 size;
 144        struct drm_gem_object *gobj;
 145        int ret = 0;
 146
 147        size = mode_cmd->pitches[0] * mode_cmd->height;
 148        ret = mgag200_gem_create(dev, size, true, &gobj);
 149        if (ret)
 150                return ret;
 151
 152        *gobj_p = gobj;
 153        return ret;
 154}
 155
 156static int mgag200fb_create(struct drm_fb_helper *helper,
 157                           struct drm_fb_helper_surface_size *sizes)
 158{
 159        struct mga_fbdev *mfbdev =
 160                container_of(helper, struct mga_fbdev, helper);
 161        struct drm_device *dev = mfbdev->helper.dev;
 162        struct drm_mode_fb_cmd2 mode_cmd;
 163        struct mga_device *mdev = dev->dev_private;
 164        struct fb_info *info;
 165        struct drm_framebuffer *fb;
 166        struct drm_gem_object *gobj = NULL;
 167        int ret;
 168        void *sysram;
 169        int size;
 170
 171        mode_cmd.width = sizes->surface_width;
 172        mode_cmd.height = sizes->surface_height;
 173        mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 174
 175        mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 176                                                          sizes->surface_depth);
 177        size = mode_cmd.pitches[0] * mode_cmd.height;
 178
 179        ret = mgag200fb_create_object(mfbdev, &mode_cmd, &gobj);
 180        if (ret) {
 181                DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 182                return ret;
 183        }
 184
 185        sysram = vmalloc(size);
 186        if (!sysram) {
 187                ret = -ENOMEM;
 188                goto err_sysram;
 189        }
 190
 191        info = drm_fb_helper_alloc_fbi(helper);
 192        if (IS_ERR(info)) {
 193                ret = PTR_ERR(info);
 194                goto err_alloc_fbi;
 195        }
 196
 197        info->par = mfbdev;
 198
 199        ret = mgag200_framebuffer_init(dev, &mfbdev->mfb, &mode_cmd, gobj);
 200        if (ret)
 201                goto err_alloc_fbi;
 202
 203        mfbdev->sysram = sysram;
 204        mfbdev->size = size;
 205
 206        fb = &mfbdev->mfb.base;
 207
 208        /* setup helper */
 209        mfbdev->helper.fb = fb;
 210
 211        strcpy(info->fix.id, "mgadrmfb");
 212
 213        info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 214        info->fbops = &mgag200fb_ops;
 215
 216        /* setup aperture base/size for vesafb takeover */
 217        info->apertures->ranges[0].base = mdev->dev->mode_config.fb_base;
 218        info->apertures->ranges[0].size = mdev->mc.vram_size;
 219
 220        drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
 221        drm_fb_helper_fill_var(info, &mfbdev->helper, sizes->fb_width,
 222                               sizes->fb_height);
 223
 224        info->screen_base = sysram;
 225        info->screen_size = size;
 226        info->pixmap.flags = FB_PIXMAP_SYSTEM;
 227
 228        DRM_DEBUG_KMS("allocated %dx%d\n",
 229                      fb->width, fb->height);
 230
 231        return 0;
 232
 233err_alloc_fbi:
 234        vfree(sysram);
 235err_sysram:
 236        drm_gem_object_unreference_unlocked(gobj);
 237
 238        return ret;
 239}
 240
 241static int mga_fbdev_destroy(struct drm_device *dev,
 242                                struct mga_fbdev *mfbdev)
 243{
 244        struct mga_framebuffer *mfb = &mfbdev->mfb;
 245
 246        drm_fb_helper_unregister_fbi(&mfbdev->helper);
 247
 248        if (mfb->obj) {
 249                drm_gem_object_unreference_unlocked(mfb->obj);
 250                mfb->obj = NULL;
 251        }
 252        drm_fb_helper_fini(&mfbdev->helper);
 253        vfree(mfbdev->sysram);
 254        drm_framebuffer_unregister_private(&mfb->base);
 255        drm_framebuffer_cleanup(&mfb->base);
 256
 257        return 0;
 258}
 259
 260static const struct drm_fb_helper_funcs mga_fb_helper_funcs = {
 261        .gamma_set = mga_crtc_fb_gamma_set,
 262        .gamma_get = mga_crtc_fb_gamma_get,
 263        .fb_probe = mgag200fb_create,
 264};
 265
 266int mgag200_fbdev_init(struct mga_device *mdev)
 267{
 268        struct mga_fbdev *mfbdev;
 269        int ret;
 270        int bpp_sel = 32;
 271
 272        /* prefer 16bpp on low end gpus with limited VRAM */
 273        if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
 274                bpp_sel = 16;
 275
 276        mfbdev = devm_kzalloc(mdev->dev->dev, sizeof(struct mga_fbdev), GFP_KERNEL);
 277        if (!mfbdev)
 278                return -ENOMEM;
 279
 280        mdev->mfbdev = mfbdev;
 281        spin_lock_init(&mfbdev->dirty_lock);
 282
 283        drm_fb_helper_prepare(mdev->dev, &mfbdev->helper, &mga_fb_helper_funcs);
 284
 285        ret = drm_fb_helper_init(mdev->dev, &mfbdev->helper,
 286                                 MGAG200FB_CONN_LIMIT);
 287        if (ret)
 288                goto err_fb_helper;
 289
 290        ret = drm_fb_helper_single_add_all_connectors(&mfbdev->helper);
 291        if (ret)
 292                goto err_fb_setup;
 293
 294        /* disable all the possible outputs/crtcs before entering KMS mode */
 295        drm_helper_disable_unused_functions(mdev->dev);
 296
 297        ret = drm_fb_helper_initial_config(&mfbdev->helper, bpp_sel);
 298        if (ret)
 299                goto err_fb_setup;
 300
 301        return 0;
 302
 303err_fb_setup:
 304        drm_fb_helper_fini(&mfbdev->helper);
 305err_fb_helper:
 306        mdev->mfbdev = NULL;
 307
 308        return ret;
 309}
 310
 311void mgag200_fbdev_fini(struct mga_device *mdev)
 312{
 313        if (!mdev->mfbdev)
 314                return;
 315
 316        mga_fbdev_destroy(mdev->dev, mdev->mfbdev);
 317}
 318