drivers/gpu/drm/omapdrm/omap_fbdev.c

   1 /*
   2  * drivers/gpu/drm/omapdrm/omap_fbdev.c
   3  *
   4  * Copyright (C) 2011 Texas Instruments
   5  * Author: Rob Clark <rob@ti.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "omap_drv.h"
  21
  22 #include "drm_crtc.h"
  23 #include "drm_fb_helper.h"
  24
  25 MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')");
  26 static bool ywrap_enabled = true;
  27 module_param_named(ywrap, ywrap_enabled, bool, 0644);
  28
  29 /*
  30  * fbdev funcs, to implement legacy fbdev interface on top of drm driver
  31  */
  32
  33 #define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base)
  34
  35 struct omap_fbdev {
  36         struct drm_fb_helper base;
  37         struct drm_framebuffer *fb;
  38         struct drm_gem_object *bo;
  39         bool ywrap_enabled;
  40
  41         /* for deferred dmm roll when getting called in atomic ctx */
  42         struct work_struct work;
  43 };
  44
  45 static void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h);
  46 static struct drm_fb_helper *get_fb(struct fb_info *fbi);
  47
  48 static ssize_t omap_fbdev_write(struct fb_info *fbi, const char __user *buf,
  49                 size_t count, loff_t *ppos)
  50 {
  51         ssize_t res;
  52
  53         res = fb_sys_write(fbi, buf, count, ppos);
  54         omap_fbdev_flush(fbi, 0, 0, fbi->var.xres, fbi->var.yres);
  55
  56         return res;
  57 }
  58
  59 static void omap_fbdev_fillrect(struct fb_info *fbi,
  60                 const struct fb_fillrect *rect)
  61 {
  62         sys_fillrect(fbi, rect);
  63         omap_fbdev_flush(fbi, rect->dx, rect->dy, rect->width, rect->height);
  64 }
  65
  66 static void omap_fbdev_copyarea(struct fb_info *fbi,
  67                 const struct fb_copyarea *area)
  68 {
  69         sys_copyarea(fbi, area);
  70         omap_fbdev_flush(fbi, area->dx, area->dy, area->width, area->height);
  71 }
  72
  73 static void omap_fbdev_imageblit(struct fb_info *fbi,
  74                 const struct fb_image *image)
  75 {
  76         sys_imageblit(fbi, image);
  77         omap_fbdev_flush(fbi, image->dx, image->dy,
  78                                 image->width, image->height);
  79 }
  80
  81 static void pan_worker(struct work_struct *work)
  82 {
  83         struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);
  84         struct fb_info *fbi = fbdev->base.fbdev;
  85         int npages;
  86
  87         /* DMM roll shifts in 4K pages: */
  88         npages = fbi->fix.line_length >> PAGE_SHIFT;
  89         omap_gem_roll(fbdev->bo, fbi->var.yoffset * npages);
  90 }
  91
  92 static int omap_fbdev_pan_display(struct fb_var_screeninfo *var,
  93                 struct fb_info *fbi)
  94 {
  95         struct drm_fb_helper *helper = get_fb(fbi);
  96         struct omap_fbdev *fbdev = to_omap_fbdev(helper);
  97
  98         if (!helper)
  99                 goto fallback;
 100
 101         if (!fbdev->ywrap_enabled)
 102                 goto fallback;
 103
 104         if (drm_can_sleep()) {
 105                 pan_worker(&fbdev->work);
 106         } else {
 107                 struct omap_drm_private *priv = helper->dev->dev_private;
 108                 queue_work(priv->wq, &fbdev->work);
 109         }
 110
 111         return 0;
 112
 113 fallback:
 114         return drm_fb_helper_pan_display(var, fbi);
 115 }
 116
 117 static struct fb_ops omap_fb_ops = {
 118         .owner = THIS_MODULE,
 119
 120         /* Note: to properly handle manual update displays, we wrap the
 121          * basic fbdev ops which write to the framebuffer
 122          */
 123         .fb_read = fb_sys_read,
 124         .fb_write = omap_fbdev_write,
 125         .fb_fillrect = omap_fbdev_fillrect,
 126         .fb_copyarea = omap_fbdev_copyarea,
 127         .fb_imageblit = omap_fbdev_imageblit,
 128
 129         .fb_check_var = drm_fb_helper_check_var,
 130         .fb_set_par = drm_fb_helper_set_par,
 131         .fb_pan_display = omap_fbdev_pan_display,
 132         .fb_blank = drm_fb_helper_blank,
 133         .fb_setcmap = drm_fb_helper_setcmap,
 134
 135         .fb_debug_enter = drm_fb_helper_debug_enter,
 136         .fb_debug_leave = drm_fb_helper_debug_leave,
 137 };
 138
 139 static int omap_fbdev_create(struct drm_fb_helper *helper,
 140                 struct drm_fb_helper_surface_size *sizes)
 141 {
 142         struct omap_fbdev *fbdev = to_omap_fbdev(helper);
 143         struct drm_device *dev = helper->dev;
 144         struct omap_drm_private *priv = dev->dev_private;
 145         struct drm_framebuffer *fb = NULL;
 146         union omap_gem_size gsize;
 147         struct fb_info *fbi = NULL;
 148         struct drm_mode_fb_cmd2 mode_cmd = {0};
 149         dma_addr_t paddr;
 150         int ret;
 151
 152         /* only doing ARGB32 since this is what is needed to alpha-blend
 153          * with video overlays:
 154          */
 155         sizes->surface_bpp = 32;
 156         sizes->surface_depth = 32;
 157
 158         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
 159                         sizes->surface_height, sizes->surface_bpp,
 160                         sizes->fb_width, sizes->fb_height);
 161
 162         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 163                         sizes->surface_depth);
 164
 165         mode_cmd.width = sizes->surface_width;
 166         mode_cmd.height = sizes->surface_height;
 167
 168         mode_cmd.pitches[0] = align_pitch(
 169                         mode_cmd.width * ((sizes->surface_bpp + 7) / 8),
 170                         mode_cmd.width, sizes->surface_bpp);
 171
 172         fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
 173         if (fbdev->ywrap_enabled) {
 174                 /* need to align pitch to page size if using DMM scrolling */
 175                 mode_cmd.pitches[0] = ALIGN(mode_cmd.pitches[0], PAGE_SIZE);
 176         }
 177
 178         /* allocate backing bo */
 179         gsize = (union omap_gem_size){
 180                 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),
 181         };
 182         DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
 183         fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);
 184         if (!fbdev->bo) {
 185                 dev_err(dev->dev, "failed to allocate buffer object\n");
 186                 ret = -ENOMEM;
 187                 goto fail;
 188         }
 189
 190         fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
 191         if (IS_ERR(fb)) {
 192                 dev_err(dev->dev, "failed to allocate fb\n");
 193                 /* note: if fb creation failed, we can't rely on fb destroy
 194                  * to unref the bo:
 195                  */
 196                 drm_gem_object_unreference(fbdev->bo);
 197                 ret = PTR_ERR(fb);
 198                 goto fail;
 199         }
 200
 201         /* note: this keeps the bo pinned.. which is perhaps not ideal,
 202          * but is needed as long as we use fb_mmap() to mmap to userspace
 203          * (since this happens using fix.smem_start).  Possibly we could
 204          * implement our own mmap using GEM mmap support to avoid this
 205          * (non-tiled buffer doesn't need to be pinned for fbcon to write
 206          * to it).  Then we just need to be sure that we are able to re-
 207          * pin it in case of an opps.
 208          */
 209         ret = omap_gem_get_paddr(fbdev->bo, &paddr, true);
 210         if (ret) {
 211                 dev_err(dev->dev,
 212                         "could not map (paddr)!  Skipping framebuffer alloc\n");
 213                 ret = -ENOMEM;
 214                 goto fail;
 215         }
 216
 217         mutex_lock(&dev->struct_mutex);
 218
 219         fbi = framebuffer_alloc(0, dev->dev);
 220         if (!fbi) {
 221                 dev_err(dev->dev, "failed to allocate fb info\n");
 222                 ret = -ENOMEM;
 223                 goto fail_unlock;
 224         }
 225
 226         DBG("fbi=%p, dev=%p", fbi, dev);
 227
 228         fbdev->fb = fb;
 229         helper->fb = fb;
 230         helper->fbdev = fbi;
 231
 232         fbi->par = helper;
 233         fbi->flags = FBINFO_DEFAULT;
 234         fbi->fbops = &omap_fb_ops;
 235
 236         strcpy(fbi->fix.id, MODULE_NAME);
 237
 238         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 239         if (ret) {
 240                 ret = -ENOMEM;
 241                 goto fail_unlock;
 242         }
 243
 244         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
 245         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
 246
 247         dev->mode_config.fb_base = paddr;
 248
 249         fbi->screen_base = omap_gem_vaddr(fbdev->bo);
 250         fbi->screen_size = fbdev->bo->size;
 251         fbi->fix.smem_start = paddr;
 252         fbi->fix.smem_len = fbdev->bo->size;
 253
 254         /* if we have DMM, then we can use it for scrolling by just
 255          * shuffling pages around in DMM rather than doing sw blit.
 256          */
 257         if (fbdev->ywrap_enabled) {
 258                 DRM_INFO("Enabling DMM ywrap scrolling\n");
 259                 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
 260                 fbi->fix.ywrapstep = 1;
 261         }
 262
 263
 264         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 265         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 266
 267         mutex_unlock(&dev->struct_mutex);
 268
 269         return 0;
 270
 271 fail_unlock:
 272         mutex_unlock(&dev->struct_mutex);
 273 fail:
 274
 275         if (ret) {
 276                 if (fbi)
 277                         framebuffer_release(fbi);
 278                 if (fb)
 279                         drm_framebuffer_remove(fb);
 280         }
 281
 282         return ret;
 283 }
 284
 285 static void omap_crtc_fb_gamma_set(struct drm_crtc *crtc,
 286                 u16 red, u16 green, u16 blue, int regno)
 287 {
 288         DBG("fbdev: set gamma");
 289 }
 290
 291 static void omap_crtc_fb_gamma_get(struct drm_crtc *crtc,
 292                 u16 *red, u16 *green, u16 *blue, int regno)
 293 {
 294         DBG("fbdev: get gamma");
 295 }
 296
 297 static int omap_fbdev_probe(struct drm_fb_helper *helper,
 298                 struct drm_fb_helper_surface_size *sizes)
 299 {
 300         int new_fb = 0;
 301         int ret;
 302
 303         if (!helper->fb) {
 304                 ret = omap_fbdev_create(helper, sizes);
 305                 if (ret)
 306                         return ret;
 307                 new_fb = 1;
 308         }
 309         return new_fb;
 310 }
 311
 312 static struct drm_fb_helper_funcs omap_fb_helper_funcs = {
 313         .gamma_set = omap_crtc_fb_gamma_set,
 314         .gamma_get = omap_crtc_fb_gamma_get,
 315         .fb_probe = omap_fbdev_probe,
 316 };
 317
 318 static struct drm_fb_helper *get_fb(struct fb_info *fbi)
 319 {
 320         if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
 321                 /* these are not the fb's you're looking for */
 322                 return NULL;
 323         }
 324         return fbi->par;
 325 }
 326
 327 /* flush an area of the framebuffer (in case of manual update display that
 328  * is not automatically flushed)
 329  */
 330 static void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h)
 331 {
 332         struct drm_fb_helper *helper = get_fb(fbi);
 333
 334         if (!helper)
 335                 return;
 336
 337         VERB("flush fbdev: %d,%d %dx%d, fbi=%p", x, y, w, h, fbi);
 338
 339         omap_framebuffer_flush(helper->fb, x, y, w, h);
 340 }
 341
 342 /* initialize fbdev helper */
 343 struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev)
 344 {
 345         struct omap_drm_private *priv = dev->dev_private;
 346         struct omap_fbdev *fbdev = NULL;
 347         struct drm_fb_helper *helper;
 348         int ret = 0;
 349
 350         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 351         if (!fbdev) {
 352                 dev_err(dev->dev, "could not allocate fbdev\n");
 353                 goto fail;
 354         }
 355
 356         INIT_WORK(&fbdev->work, pan_worker);
 357
 358         helper = &fbdev->base;
 359
 360         helper->funcs = &omap_fb_helper_funcs;
 361
 362         ret = drm_fb_helper_init(dev, helper,
 363                         priv->num_crtcs, priv->num_connectors);
 364         if (ret) {
 365                 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
 366                 goto fail;
 367         }
 368
 369         drm_fb_helper_single_add_all_connectors(helper);
 370         drm_fb_helper_initial_config(helper, 32);
 371
 372         priv->fbdev = helper;
 373
 374         return helper;
 375
 376 fail:
 377         kfree(fbdev);
 378         return NULL;
 379 }
 380
 381 void omap_fbdev_free(struct drm_device *dev)
 382 {
 383         struct omap_drm_private *priv = dev->dev_private;
 384         struct drm_fb_helper *helper = priv->fbdev;
 385         struct omap_fbdev *fbdev;
 386         struct fb_info *fbi;
 387
 388         DBG();
 389
 390         fbi = helper->fbdev;
 391
 392         /* only cleanup framebuffer if it is present */
 393         if (fbi) {
 394                 unregister_framebuffer(fbi);
 395                 framebuffer_release(fbi);
 396         }
 397
 398         drm_fb_helper_fini(helper);
 399
 400         fbdev = to_omap_fbdev(priv->fbdev);
 401
 402         /* this will free the backing object */
 403         if (fbdev->fb)
 404                 drm_framebuffer_remove(fbdev->fb);
 405
 406         kfree(fbdev);
 407
 408         priv->fbdev = NULL;
 409 }