drivers/gpu/drm/omapdrm/omap_fbdev.c

   1 /*
   2  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
   3  * Author: Rob Clark <rob@ti.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <drm/drm_crtc.h>
  19 #include <drm/drm_util.h>
  20 #include <drm/drm_fb_helper.h>
  21 #include <drm/drm_file.h>
  22 #include <drm/drm_fourcc.h>
  23
  24 #include "omap_drv.h"
  25
  26 MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')");
  27 static bool ywrap_enabled = true;
  28 module_param_named(ywrap, ywrap_enabled, bool, 0644);
  29
  30 /*
  31  * fbdev funcs, to implement legacy fbdev interface on top of drm driver
  32  */
  33
  34 #define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base)
  35
  36 struct omap_fbdev {
  37         struct drm_fb_helper base;
  38         struct drm_framebuffer *fb;
  39         struct drm_gem_object *bo;
  40         bool ywrap_enabled;
  41
  42         /* for deferred dmm roll when getting called in atomic ctx */
  43         struct work_struct work;
  44 };
  45
  46 static struct drm_fb_helper *get_fb(struct fb_info *fbi);
  47
  48 static void pan_worker(struct work_struct *work)
  49 {
  50         struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);
  51         struct fb_info *fbi = fbdev->base.fbdev;
  52         int npages;
  53
  54         /* DMM roll shifts in 4K pages: */
  55         npages = fbi->fix.line_length >> PAGE_SHIFT;
  56         omap_gem_roll(fbdev->bo, fbi->var.yoffset * npages);
  57 }
  58
  59 static int omap_fbdev_pan_display(struct fb_var_screeninfo *var,
  60                 struct fb_info *fbi)
  61 {
  62         struct drm_fb_helper *helper = get_fb(fbi);
  63         struct omap_fbdev *fbdev = to_omap_fbdev(helper);
  64
  65         if (!helper)
  66                 goto fallback;
  67
  68         if (!fbdev->ywrap_enabled)
  69                 goto fallback;
  70
  71         if (drm_can_sleep()) {
  72                 pan_worker(&fbdev->work);
  73         } else {
  74                 struct omap_drm_private *priv = helper->dev->dev_private;
  75                 queue_work(priv->wq, &fbdev->work);
  76         }
  77
  78         return 0;
  79
  80 fallback:
  81         return drm_fb_helper_pan_display(var, fbi);
  82 }
  83
  84 static struct fb_ops omap_fb_ops = {
  85         .owner = THIS_MODULE,
  86
  87         .fb_check_var   = drm_fb_helper_check_var,
  88         .fb_set_par     = drm_fb_helper_set_par,
  89         .fb_setcmap     = drm_fb_helper_setcmap,
  90         .fb_blank       = drm_fb_helper_blank,
  91         .fb_pan_display = omap_fbdev_pan_display,
  92         .fb_ioctl       = drm_fb_helper_ioctl,
  93
  94         .fb_read = drm_fb_helper_sys_read,
  95         .fb_write = drm_fb_helper_sys_write,
  96         .fb_fillrect = drm_fb_helper_sys_fillrect,
  97         .fb_copyarea = drm_fb_helper_sys_copyarea,
  98         .fb_imageblit = drm_fb_helper_sys_imageblit,
  99 };
 100
 101 static int omap_fbdev_create(struct drm_fb_helper *helper,
 102                 struct drm_fb_helper_surface_size *sizes)
 103 {
 104         struct omap_fbdev *fbdev = to_omap_fbdev(helper);
 105         struct drm_device *dev = helper->dev;
 106         struct omap_drm_private *priv = dev->dev_private;
 107         struct drm_framebuffer *fb = NULL;
 108         union omap_gem_size gsize;
 109         struct fb_info *fbi = NULL;
 110         struct drm_mode_fb_cmd2 mode_cmd = {0};
 111         dma_addr_t dma_addr;
 112         int ret;
 113
 114         sizes->surface_bpp = 32;
 115         sizes->surface_depth = 24;
 116
 117         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
 118                         sizes->surface_height, sizes->surface_bpp,
 119                         sizes->fb_width, sizes->fb_height);
 120
 121         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 122                         sizes->surface_depth);
 123
 124         mode_cmd.width = sizes->surface_width;
 125         mode_cmd.height = sizes->surface_height;
 126
 127         mode_cmd.pitches[0] =
 128                         DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8);
 129
 130         fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
 131         if (fbdev->ywrap_enabled) {
 132                 /* need to align pitch to page size if using DMM scrolling */
 133                 mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]);
 134         }
 135
 136         /* allocate backing bo */
 137         gsize = (union omap_gem_size){
 138                 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),
 139         };
 140         DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
 141         fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);
 142         if (!fbdev->bo) {
 143                 dev_err(dev->dev, "failed to allocate buffer object\n");
 144                 ret = -ENOMEM;
 145                 goto fail;
 146         }
 147
 148         fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
 149         if (IS_ERR(fb)) {
 150                 dev_err(dev->dev, "failed to allocate fb\n");
 151                 /* note: if fb creation failed, we can't rely on fb destroy
 152                  * to unref the bo:
 153                  */
 154                 drm_gem_object_put_unlocked(fbdev->bo);
 155                 ret = PTR_ERR(fb);
 156                 goto fail;
 157         }
 158
 159         /* note: this keeps the bo pinned.. which is perhaps not ideal,
 160          * but is needed as long as we use fb_mmap() to mmap to userspace
 161          * (since this happens using fix.smem_start).  Possibly we could
 162          * implement our own mmap using GEM mmap support to avoid this
 163          * (non-tiled buffer doesn't need to be pinned for fbcon to write
 164          * to it).  Then we just need to be sure that we are able to re-
 165          * pin it in case of an opps.
 166          */
 167         ret = omap_gem_pin(fbdev->bo, &dma_addr);
 168         if (ret) {
 169                 dev_err(dev->dev, "could not pin framebuffer\n");
 170                 ret = -ENOMEM;
 171                 goto fail;
 172         }
 173
 174         fbi = drm_fb_helper_alloc_fbi(helper);
 175         if (IS_ERR(fbi)) {
 176                 dev_err(dev->dev, "failed to allocate fb info\n");
 177                 ret = PTR_ERR(fbi);
 178                 goto fail;
 179         }
 180
 181         DBG("fbi=%p, dev=%p", fbi, dev);
 182
 183         fbdev->fb = fb;
 184         helper->fb = fb;
 185
 186         fbi->fbops = &omap_fb_ops;
 187
 188         drm_fb_helper_fill_info(fbi, helper, sizes);
 189
 190         dev->mode_config.fb_base = dma_addr;
 191
 192         fbi->screen_buffer = omap_gem_vaddr(fbdev->bo);
 193         fbi->screen_size = fbdev->bo->size;
 194         fbi->fix.smem_start = dma_addr;
 195         fbi->fix.smem_len = fbdev->bo->size;
 196
 197         /* if we have DMM, then we can use it for scrolling by just
 198          * shuffling pages around in DMM rather than doing sw blit.
 199          */
 200         if (fbdev->ywrap_enabled) {
 201                 DRM_INFO("Enabling DMM ywrap scrolling\n");
 202                 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
 203                 fbi->fix.ywrapstep = 1;
 204         }
 205
 206
 207         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 208         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 209
 210         return 0;
 211
 212 fail:
 213
 214         if (ret) {
 215                 if (fb)
 216                         drm_framebuffer_remove(fb);
 217         }
 218
 219         return ret;
 220 }
 221
 222 static const struct drm_fb_helper_funcs omap_fb_helper_funcs = {
 223         .fb_probe = omap_fbdev_create,
 224 };
 225
 226 static struct drm_fb_helper *get_fb(struct fb_info *fbi)
 227 {
 228         if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
 229                 /* these are not the fb's you're looking for */
 230                 return NULL;
 231         }
 232         return fbi->par;
 233 }
 234
 235 /* initialize fbdev helper */
 236 void omap_fbdev_init(struct drm_device *dev)
 237 {
 238         struct omap_drm_private *priv = dev->dev_private;
 239         struct omap_fbdev *fbdev = NULL;
 240         struct drm_fb_helper *helper;
 241         int ret = 0;
 242
 243         if (!priv->num_pipes)
 244                 return;
 245
 246         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 247         if (!fbdev)
 248                 goto fail;
 249
 250         INIT_WORK(&fbdev->work, pan_worker);
 251
 252         helper = &fbdev->base;
 253
 254         drm_fb_helper_prepare(dev, helper, &omap_fb_helper_funcs);
 255
 256         ret = drm_fb_helper_init(dev, helper, priv->num_pipes);
 257         if (ret)
 258                 goto fail;
 259
 260         ret = drm_fb_helper_single_add_all_connectors(helper);
 261         if (ret)
 262                 goto fini;
 263
 264         ret = drm_fb_helper_initial_config(helper, 32);
 265         if (ret)
 266                 goto fini;
 267
 268         priv->fbdev = helper;
 269
 270         return;
 271
 272 fini:
 273         drm_fb_helper_fini(helper);
 274 fail:
 275         kfree(fbdev);
 276
 277         dev_warn(dev->dev, "omap_fbdev_init failed\n");
 278 }
 279
 280 void omap_fbdev_fini(struct drm_device *dev)
 281 {
 282         struct omap_drm_private *priv = dev->dev_private;
 283         struct drm_fb_helper *helper = priv->fbdev;
 284         struct omap_fbdev *fbdev;
 285
 286         DBG();
 287
 288         if (!helper)
 289                 return;
 290
 291         drm_fb_helper_unregister_fbi(helper);
 292
 293         drm_fb_helper_fini(helper);
 294
 295         fbdev = to_omap_fbdev(helper);
 296
 297         /* unpin the GEM object pinned in omap_fbdev_create() */
 298         if (fbdev->bo)
 299                 omap_gem_unpin(fbdev->bo);
 300
 301         /* this will free the backing object */
 302         if (fbdev->fb)
 303                 drm_framebuffer_remove(fbdev->fb);
 304
 305         kfree(fbdev);
 306
 307         priv->fbdev = NULL;
 308 }