drivers/staging/omapdrm/omap_fbdev.c

   1 /*
   2  * drivers/staging/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, "could not map (paddr)!\n");
 212                 ret = -ENOMEM;
 213                 goto fail;
 214         }
 215
 216         mutex_lock(&dev->struct_mutex);
 217
 218         fbi = framebuffer_alloc(0, dev->dev);
 219         if (!fbi) {
 220                 dev_err(dev->dev, "failed to allocate fb info\n");
 221                 ret = -ENOMEM;
 222                 goto fail_unlock;
 223         }
 224
 225         DBG("fbi=%p, dev=%p", fbi, dev);
 226
 227         fbdev->fb = fb;
 228         helper->fb = fb;
 229         helper->fbdev = fbi;
 230
 231         fbi->par = helper;
 232         fbi->flags = FBINFO_DEFAULT;
 233         fbi->fbops = &omap_fb_ops;
 234
 235         strcpy(fbi->fix.id, MODULE_NAME);
 236
 237         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 238         if (ret) {
 239                 ret = -ENOMEM;
 240                 goto fail_unlock;
 241         }
 242
 243         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
 244         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
 245
 246         dev->mode_config.fb_base = paddr;
 247
 248         fbi->screen_base = omap_gem_vaddr(fbdev->bo);
 249         fbi->screen_size = fbdev->bo->size;
 250         fbi->fix.smem_start = paddr;
 251         fbi->fix.smem_len = fbdev->bo->size;
 252
 253         /* if we have DMM, then we can use it for scrolling by just
 254          * shuffling pages around in DMM rather than doing sw blit.
 255          */
 256         if (fbdev->ywrap_enabled) {
 257                 DRM_INFO("Enabling DMM ywrap scrolling\n");
 258                 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
 259                 fbi->fix.ywrapstep = 1;
 260         }
 261
 262
 263         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 264         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 265
 266         mutex_unlock(&dev->struct_mutex);
 267
 268         return 0;
 269
 270 fail_unlock:
 271         mutex_unlock(&dev->struct_mutex);
 272 fail:
 273
 274         if (ret) {
 275                 if (fbi)
 276                         framebuffer_release(fbi);
 277                 if (fb)
 278                         fb->funcs->destroy(fb);
 279         }
 280
 281         return ret;
 282 }
 283
 284 static void omap_crtc_fb_gamma_set(struct drm_crtc *crtc,
 285                 u16 red, u16 green, u16 blue, int regno)
 286 {
 287         DBG("fbdev: set gamma");
 288 }
 289
 290 static void omap_crtc_fb_gamma_get(struct drm_crtc *crtc,
 291                 u16 *red, u16 *green, u16 *blue, int regno)
 292 {
 293         DBG("fbdev: get gamma");
 294 }
 295
 296 static int omap_fbdev_probe(struct drm_fb_helper *helper,
 297                 struct drm_fb_helper_surface_size *sizes)
 298 {
 299         int new_fb = 0;
 300         int ret;
 301
 302         if (!helper->fb) {
 303                 ret = omap_fbdev_create(helper, sizes);
 304                 if (ret)
 305                         return ret;
 306                 new_fb = 1;
 307         }
 308         return new_fb;
 309 }
 310
 311 static struct drm_fb_helper_funcs omap_fb_helper_funcs = {
 312         .gamma_set = omap_crtc_fb_gamma_set,
 313         .gamma_get = omap_crtc_fb_gamma_get,
 314         .fb_probe = omap_fbdev_probe,
 315 };
 316
 317 static struct drm_fb_helper *get_fb(struct fb_info *fbi)
 318 {
 319         if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
 320                 /* these are not the fb's you're looking for */
 321                 return NULL;
 322         }
 323         return fbi->par;
 324 }
 325
 326 /* flush an area of the framebuffer (in case of manual update display that
 327  * is not automatically flushed)
 328  */
 329 static void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h)
 330 {
 331         struct drm_fb_helper *helper = get_fb(fbi);
 332
 333         if (!helper)
 334                 return;
 335
 336         VERB("flush fbdev: %d,%d %dx%d, fbi=%p", x, y, w, h, fbi);
 337
 338         omap_framebuffer_flush(helper->fb, x, y, w, h);
 339 }
 340
 341 /* initialize fbdev helper */
 342 struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev)
 343 {
 344         struct omap_drm_private *priv = dev->dev_private;
 345         struct omap_fbdev *fbdev = NULL;
 346         struct drm_fb_helper *helper;
 347         int ret = 0;
 348
 349         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 350         if (!fbdev) {
 351                 dev_err(dev->dev, "could not allocate fbdev\n");
 352                 goto fail;
 353         }
 354
 355         INIT_WORK(&fbdev->work, pan_worker);
 356
 357         helper = &fbdev->base;
 358
 359         helper->funcs = &omap_fb_helper_funcs;
 360
 361         ret = drm_fb_helper_init(dev, helper,
 362                         priv->num_crtcs, priv->num_connectors);
 363         if (ret) {
 364                 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
 365                 goto fail;
 366         }
 367
 368         drm_fb_helper_single_add_all_connectors(helper);
 369         drm_fb_helper_initial_config(helper, 32);
 370
 371         priv->fbdev = helper;
 372
 373         return helper;
 374
 375 fail:
 376         kfree(fbdev);
 377         return NULL;
 378 }
 379
 380 void omap_fbdev_free(struct drm_device *dev)
 381 {
 382         struct omap_drm_private *priv = dev->dev_private;
 383         struct drm_fb_helper *helper = priv->fbdev;
 384         struct omap_fbdev *fbdev;
 385         struct fb_info *fbi;
 386
 387         DBG();
 388
 389         fbi = helper->fbdev;
 390
 391         unregister_framebuffer(fbi);
 392         framebuffer_release(fbi);
 393
 394         drm_fb_helper_fini(helper);
 395
 396         fbdev = to_omap_fbdev(priv->fbdev);
 397
 398         /* this will free the backing object */
 399         if (fbdev->fb)
 400                 fbdev->fb->funcs->destroy(fbdev->fb);
 401
 402         kfree(fbdev);
 403
 404         priv->fbdev = NULL;
 405 }