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