Pileus Git - ~andy/linux/blob - 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_cmd mode_cmd = {0};
 133         dma_addr_t paddr;
 134         void __iomem *vaddr;
 135         int size, screen_width;
 136         int ret;
 137
 138         /* only doing ARGB32 since this is what is needed to alpha-blend
 139          * with video overlays:
 140          */
 141         sizes->surface_bpp = 32;
 142         sizes->surface_depth = 32;
 143
 144         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
 145                         sizes->surface_height, sizes->surface_bpp,
 146                         sizes->fb_width, sizes->fb_height);
 147
 148         mode_cmd.width = sizes->surface_width;
 149         mode_cmd.height = sizes->surface_height;
 150
 151         mode_cmd.bpp = sizes->surface_bpp;
 152         mode_cmd.depth = sizes->surface_depth;
 153
 154         mode_cmd.pitch = align_pitch(
 155                         mode_cmd.width * ((mode_cmd.bpp + 7) / 8),
 156                         mode_cmd.width, mode_cmd.bpp);
 157
 158         fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled;
 159         if (fbdev->ywrap_enabled) {
 160                 /* need to align pitch to page size if using DMM scrolling */
 161                 mode_cmd.pitch = ALIGN(mode_cmd.pitch, PAGE_SIZE);
 162         }
 163
 164         /* allocate backing bo */
 165         gsize = (union omap_gem_size){
 166                 .bytes = PAGE_ALIGN(mode_cmd.pitch * mode_cmd.height),
 167         };
 168         DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index);
 169         fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC);
 170         if (!fbdev->bo) {
 171                 dev_err(dev->dev, "failed to allocate buffer object\n");
 172                 goto fail;
 173         }
 174
 175         fb = omap_framebuffer_init(dev, &mode_cmd, fbdev->bo);
 176         if (!fb) {
 177                 dev_err(dev->dev, "failed to allocate fb\n");
 178                 ret = -ENOMEM;
 179                 goto fail;
 180         }
 181
 182         mutex_lock(&dev->struct_mutex);
 183
 184         fbi = framebuffer_alloc(0, dev->dev);
 185         if (!fbi) {
 186                 dev_err(dev->dev, "failed to allocate fb info\n");
 187                 ret = -ENOMEM;
 188                 goto fail_unlock;
 189         }
 190
 191         DBG("fbi=%p, dev=%p", fbi, dev);
 192
 193         fbdev->fb = fb;
 194         helper->fb = fb;
 195         helper->fbdev = fbi;
 196
 197         fbi->par = helper;
 198         fbi->flags = FBINFO_DEFAULT;
 199         fbi->fbops = &omap_fb_ops;
 200
 201         strcpy(fbi->fix.id, MODULE_NAME);
 202
 203         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 204         if (ret) {
 205                 ret = -ENOMEM;
 206                 goto fail_unlock;
 207         }
 208
 209         drm_fb_helper_fill_fix(fbi, fb->pitch, fb->depth);
 210         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
 211
 212         size = omap_framebuffer_get_buffer(fb, 0, 0,
 213                         &vaddr, &paddr, &screen_width);
 214
 215         dev->mode_config.fb_base = paddr;
 216
 217         fbi->screen_base = vaddr;
 218         fbi->screen_size = size;
 219         fbi->fix.smem_start = paddr;
 220         fbi->fix.smem_len = size;
 221
 222         /* if we have DMM, then we can use it for scrolling by just
 223          * shuffling pages around in DMM rather than doing sw blit.
 224          */
 225         if (fbdev->ywrap_enabled) {
 226                 DRM_INFO("Enabling DMM ywrap scrolling\n");
 227                 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST;
 228                 fbi->fix.ywrapstep = 1;
 229         }
 230
 231
 232         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 233         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 234
 235         mutex_unlock(&dev->struct_mutex);
 236
 237         return 0;
 238
 239 fail_unlock:
 240         mutex_unlock(&dev->struct_mutex);
 241 fail:
 242
 243         if (ret) {
 244                 if (fbi)
 245                         framebuffer_release(fbi);
 246                 if (fb)
 247                         fb->funcs->destroy(fb);
 248         }
 249
 250         return ret;
 251 }
 252
 253 static void omap_crtc_fb_gamma_set(struct drm_crtc *crtc,
 254                 u16 red, u16 green, u16 blue, int regno)
 255 {
 256         DBG("fbdev: set gamma");
 257 }
 258
 259 static void omap_crtc_fb_gamma_get(struct drm_crtc *crtc,
 260                 u16 *red, u16 *green, u16 *blue, int regno)
 261 {
 262         DBG("fbdev: get gamma");
 263 }
 264
 265 static int omap_fbdev_probe(struct drm_fb_helper *helper,
 266                 struct drm_fb_helper_surface_size *sizes)
 267 {
 268         int new_fb = 0;
 269         int ret;
 270
 271         if (!helper->fb) {
 272                 ret = omap_fbdev_create(helper, sizes);
 273                 if (ret)
 274                         return ret;
 275                 new_fb = 1;
 276         }
 277         return new_fb;
 278 }
 279
 280 static struct drm_fb_helper_funcs omap_fb_helper_funcs = {
 281         .gamma_set = omap_crtc_fb_gamma_set,
 282         .gamma_get = omap_crtc_fb_gamma_get,
 283         .fb_probe = omap_fbdev_probe,
 284 };
 285
 286 static struct drm_fb_helper *get_fb(struct fb_info *fbi)
 287 {
 288         if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) {
 289                 /* these are not the fb's you're looking for */
 290                 return NULL;
 291         }
 292         return fbi->par;
 293 }
 294
 295 /* flush an area of the framebuffer (in case of manual update display that
 296  * is not automatically flushed)
 297  */
 298 static void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h)
 299 {
 300         struct drm_fb_helper *helper = get_fb(fbi);
 301
 302         if (!helper)
 303                 return;
 304
 305         VERB("flush fbdev: %d,%d %dx%d, fbi=%p", x, y, w, h, fbi);
 306
 307         omap_framebuffer_flush(helper->fb, x, y, w, h);
 308 }
 309
 310 /* initialize fbdev helper */
 311 struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev)
 312 {
 313         struct omap_drm_private *priv = dev->dev_private;
 314         struct omap_fbdev *fbdev = NULL;
 315         struct drm_fb_helper *helper;
 316         int ret = 0;
 317
 318         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 319         if (!fbdev) {
 320                 dev_err(dev->dev, "could not allocate fbdev\n");
 321                 goto fail;
 322         }
 323
 324         helper = &fbdev->base;
 325
 326         helper->funcs = &omap_fb_helper_funcs;
 327
 328         ret = drm_fb_helper_init(dev, helper,
 329                         priv->num_crtcs, priv->num_connectors);
 330         if (ret) {
 331                 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret);
 332                 goto fail;
 333         }
 334
 335         drm_fb_helper_single_add_all_connectors(helper);
 336         drm_fb_helper_initial_config(helper, 32);
 337
 338         priv->fbdev = helper;
 339
 340         return helper;
 341
 342 fail:
 343         kfree(fbdev);
 344         return NULL;
 345 }
 346
 347 void omap_fbdev_free(struct drm_device *dev)
 348 {
 349         struct omap_drm_private *priv = dev->dev_private;
 350         struct drm_fb_helper *helper = priv->fbdev;
 351         struct omap_fbdev *fbdev;
 352         struct fb_info *fbi;
 353
 354         DBG();
 355
 356         fbi = helper->fbdev;
 357
 358         unregister_framebuffer(fbi);
 359         framebuffer_release(fbi);
 360
 361         drm_fb_helper_fini(helper);
 362
 363         fbdev = to_omap_fbdev(priv->fbdev);
 364
 365         kfree(fbdev);
 366
 367         /* this will free the backing object */
 368         if (fbdev->fb)
 369                 fbdev->fb->funcs->destroy(fbdev->fb);
 370
 371         priv->fbdev = NULL;
 372 }