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
  22 #include "omap_drv.h"
  23
  24 MODULE_PARM_DESC(ywrap, "Enable ywrap scrolling (omap44xx and later, default 'y')");
  25 static bool ywrap_enabled = true;
  26 module_param_named(ywrap, ywrap_enabled, bool, 0644);
  27
  28 /*
  29  * fbdev funcs, to implement legacy fbdev interface on top of drm driver
  30  */
  31
  32 #define to_omap_fbdev(x) container_of(x, struct omap_fbdev, base)
  33
  34 struct omap_fbdev {
  35         struct drm_fb_helper base;
  36         struct drm_framebuffer *fb;
  37         struct drm_gem_object *bo;
  38         bool ywrap_enabled;
  39
  40         /* for deferred dmm roll when getting called in atomic ctx */
  41         struct work_struct work;
  42 };
  43
  44 static struct drm_fb_helper *get_fb(struct fb_info *fbi);
  45
  46 static void pan_worker(struct work_struct *work)
  47 {
  48         struct omap_fbdev *fbdev = container_of(work, struct omap_fbdev, work);
  49         struct fb_info *fbi = fbdev->base.fbdev;
  50         int npages;
  51
  52         /* DMM roll shifts in 4K pages: */
  53         npages = fbi->fix.line_length >> PAGE_SHIFT;
  54         omap_gem_roll(fbdev->bo, fbi->var.yoffset * npages);
  55 }
  56
  57 static int omap_fbdev_pan_display(struct fb_var_screeninfo *var,
  58                 struct fb_info *fbi)
  59 {
  60         struct drm_fb_helper *helper = get_fb(fbi);
  61         struct omap_fbdev *fbdev = to_omap_fbdev(helper);
  62
  63         if (!helper)
  64                 goto fallback;
  65
  66         if (!fbdev->ywrap_enabled)
  67                 goto fallback;
  68
  69         if (drm_can_sleep()) {
  70                 pan_worker(&fbdev->work);
  71         } else {
  72                 struct omap_drm_private *priv = helper->dev->dev_private;
  73                 queue_work(priv->wq, &fbdev->work);
  74         }
  75
  76         return 0;
  77
  78 fallback:
  79         return drm_fb_helper_pan_display(var, fbi);
  80 }
  81
  82 static struct fb_ops omap_fb_ops = {
  83         .owner = THIS_MODULE,
  84
  85         .fb_check_var   = drm_fb_helper_check_var,
  86         .fb_set_par     = drm_fb_helper_set_par,
  87         .fb_setcmap     = drm_fb_helper_setcmap,
  88         .fb_blank       = drm_fb_helper_blank,
  89         .fb_pan_display = omap_fbdev_pan_display,
  90         .fb_ioctl       = drm_fb_helper_ioctl,
  91
  92         .fb_read = drm_fb_helper_sys_read,
  93         .fb_write = drm_fb_helper_sys_write,
  94         .fb_fillrect = drm_fb_helper_sys_fillrect,
  95         .fb_copyarea = drm_fb_helper_sys_copyarea,
  96         .fb_imageblit = drm_fb_helper_sys_imageblit,
  97 };
  98
  99 static int omap_fbdev_create(struct drm_fb_helper *helper,
 100                 struct drm_fb_helper_surface_size *sizes)
 101 {
 102         struct omap_fbdev *fbdev = to_omap_fbdev(helper);
 103         struct drm_device *dev = helper->dev;
 104         struct omap_drm_private *priv = dev->dev_private;
 105         struct drm_framebuffer *fb = NULL;
 106         union omap_gem_size gsize;
 107         struct fb_info *fbi = NULL;
 108         struct drm_mode_fb_cmd2 mode_cmd = {0};
 109         dma_addr_t dma_addr;
 110         int ret;
 111
 112         sizes->surface_bpp = 32;
 113         sizes->surface_depth = 24;
 114
 115         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
 116                         sizes->surface_height, sizes->surface_bpp,
 117                         sizes->fb_width, sizes->fb_height);
 118
 119         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 120                         sizes->surface_depth);
 121
 122         mode_cmd.width = sizes->surface_width;
 123         mode_cmd.height = sizes->surface_height;
 124
 125         mode_cmd.pitches[0] =
 126                         DIV_ROUND_UP(mode_cmd.width * sizes->surface_bpp, 8);
 127
 128         fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
 129         if (fbdev->ywrap_enabled) {
 130                 /* need to align pitch to page size if using DMM scrolling */
 131                 mode_cmd.pitches[0] = PAGE_ALIGN(mode_cmd.pitches[0]);
 132         }
 133
 134         /* allocate backing bo */
 135         gsize = (union omap_gem_size){
 136                 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height),
 137         };
 138         DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
 139         fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);
 140         if (!fbdev->bo) {
 141                 dev_err(dev->dev, "failed to allocate buffer object\n");
 142                 ret = -ENOMEM;
 143                 goto fail;
 144         }
 145
 146         fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo);
 147         if (IS_ERR(fb)) {
 148                 dev_err(dev->dev, "failed to allocate fb\n");
 149                 /* note: if fb creation failed, we can't rely on fb destroy
 150                  * to unref the bo:
 151                  */
 152                 drm_gem_object_put_unlocked(fbdev->bo);
 153                 ret = PTR_ERR(fb);
 154                 goto fail;
 155         }
 156
 157         /* note: this keeps the bo pinned.. which is perhaps not ideal,
 158          * but is needed as long as we use fb_mmap() to mmap to userspace
 159          * (since this happens using fix.smem_start).  Possibly we could
 160          * implement our own mmap using GEM mmap support to avoid this
 161          * (non-tiled buffer doesn't need to be pinned for fbcon to write
 162          * to it).  Then we just need to be sure that we are able to re-
 163          * pin it in case of an opps.
 164          */
 165         ret = omap_gem_pin(fbdev->bo, &dma_addr);
 166         if (ret) {
 167                 dev_err(dev->dev, "could not pin framebuffer\n");
 168                 ret = -ENOMEM;
 169                 goto fail;
 170         }
 171
 172         fbi = drm_fb_helper_alloc_fbi(helper);
 173         if (IS_ERR(fbi)) {
 174                 dev_err(dev->dev, "failed to allocate fb info\n");
 175                 ret = PTR_ERR(fbi);
 176                 goto fail;
 177         }
 178
 179         DBG("fbi=%p, dev=%p", fbi, dev);
 180
 181         fbdev->fb = fb;
 182         helper->fb = fb;
 183
 184         fbi->fbops = &omap_fb_ops;
 185
 186         drm_fb_helper_fill_info(fbi, helper, sizes);
 187
 188         dev->mode_config.fb_base = dma_addr;
 189
 190         fbi->screen_buffer = omap_gem_vaddr(fbdev->bo);
 191         fbi->screen_size = fbdev->bo->size;
 192         fbi->fix.smem_start = dma_addr;
 193         fbi->fix.smem_len = fbdev->bo->size;
 194
 195         /* if we have DMM, then we can use it for scrolling by just
 196          * shuffling pages around in DMM rather than doing sw blit.
 197          */
 198         if (fbdev->ywrap_enabled) {
 199                 DRM_INFO("Enabling DMM ywrap scrolling\n");
 200                 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
 201                 fbi->fix.ywrapstep = 1;
 202         }
 203
 204
 205         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 206         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 207
 208         return 0;
 209
 210 fail:
 211
 212         if (ret) {
 213                 if (fb)
 214                         drm_framebuffer_remove(fb);
 215         }
 216
 217         return ret;
 218 }
 219
 220 static const struct drm_fb_helper_funcs omap_fb_helper_funcs = {
 221         .fb_probe = omap_fbdev_create,
 222 };
 223
 224 static struct drm_fb_helper *get_fb(struct fb_info *fbi)
 225 {
 226         if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
 227                 /* these are not the fb's you're looking for */
 228                 return NULL;
 229         }
 230         return fbi->par;
 231 }
 232
 233 /* initialize fbdev helper */
 234 void omap_fbdev_init(struct drm_device *dev)
 235 {
 236         struct omap_drm_private *priv = dev->dev_private;
 237         struct omap_fbdev *fbdev = NULL;
 238         struct drm_fb_helper *helper;
 239         int ret = 0;
 240
 241         if (!priv->num_pipes)
 242                 return;
 243
 244         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 245         if (!fbdev)
 246                 goto fail;
 247
 248         INIT_WORK(&fbdev->work, pan_worker);
 249
 250         helper = &fbdev->base;
 251
 252         drm_fb_helper_prepare(dev, helper, &omap_fb_helper_funcs);
 253
 254         ret = drm_fb_helper_init(dev, helper, priv->num_pipes);
 255         if (ret)
 256                 goto fail;
 257
 258         ret = drm_fb_helper_single_add_all_connectors(helper);
 259         if (ret)
 260                 goto fini;
 261
 262         ret = drm_fb_helper_initial_config(helper, 32);
 263         if (ret)
 264                 goto fini;
 265
 266         priv->fbdev = helper;
 267
 268         return;
 269
 270 fini:
 271         drm_fb_helper_fini(helper);
 272 fail:
 273         kfree(fbdev);
 274
 275         dev_warn(dev->dev, "omap_fbdev_init failed\n");
 276 }
 277
 278 void omap_fbdev_fini(struct drm_device *dev)
 279 {
 280         struct omap_drm_private *priv = dev->dev_private;
 281         struct drm_fb_helper *helper = priv->fbdev;
 282         struct omap_fbdev *fbdev;
 283
 284         DBG();
 285
 286         if (!helper)
 287                 return;
 288
 289         drm_fb_helper_unregister_fbi(helper);
 290
 291         drm_fb_helper_fini(helper);
 292
 293         fbdev = to_omap_fbdev(helper);
 294
 295         /* unpin the GEM object pinned in omap_fbdev_create() */
 296         if (fbdev->bo)
 297                 omap_gem_unpin(fbdev->bo);
 298
 299         /* this will free the backing object */
 300         if (fbdev->fb)
 301                 drm_framebuffer_remove(fbdev->fb);
 302
 303         kfree(fbdev);
 304
 305         priv->fbdev = NULL;
 306 }