1 /* 2 * drivers/gpu/drm/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 }; 135 136 static int omap_fbdev_create(struct drm_fb_helper *helper, 137 struct drm_fb_helper_surface_size *sizes) 138 { 139 struct omap_fbdev *fbdev = to_omap_fbdev(helper); 140 struct drm_device *dev = helper->dev; 141 struct omap_drm_private *priv = dev->dev_private; 142 struct drm_framebuffer *fb = NULL; 143 union omap_gem_size gsize; 144 struct fb_info *fbi = NULL; 145 struct drm_mode_fb_cmd2 mode_cmd = {0}; 146 dma_addr_t paddr; 147 int ret; 148 149 /* only doing ARGB32 since this is what is needed to alpha-blend 150 * with video overlays: 151 */ 152 sizes->surface_bpp = 32; 153 sizes->surface_depth = 32; 154 155 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, 156 sizes->surface_height, sizes->surface_bpp, 157 sizes->fb_width, sizes->fb_height); 158 159 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 160 sizes->surface_depth); 161 162 mode_cmd.width = sizes->surface_width; 163 mode_cmd.height = sizes->surface_height; 164 165 mode_cmd.pitches[0] = align_pitch( 166 mode_cmd.width * ((sizes->surface_bpp + 7) / 8), 167 mode_cmd.width, sizes->surface_bpp); 168 169 fbdev->ywrap_enabled = priv->has_dmm && ywrap_enabled; 170 if (fbdev->ywrap_enabled) { 171 /* need to align pitch to page size if using DMM scrolling */ 172 mode_cmd.pitches[0] = ALIGN(mode_cmd.pitches[0], PAGE_SIZE); 173 } 174 175 /* allocate backing bo */ 176 gsize = (union omap_gem_size){ 177 .bytes = PAGE_ALIGN(mode_cmd.pitches[0] * mode_cmd.height), 178 }; 179 DBG("allocating %d bytes for fb %d", gsize.bytes, dev->primary->index); 180 fbdev->bo = omap_gem_new(dev, gsize, OMAP_BO_SCANOUT | OMAP_BO_WC); 181 if (!fbdev->bo) { 182 dev_err(dev->dev, "failed to allocate buffer object\n"); 183 ret = -ENOMEM; 184 goto fail; 185 } 186 187 fb = omap_framebuffer_init(dev, &mode_cmd, &fbdev->bo); 188 if (IS_ERR(fb)) { 189 dev_err(dev->dev, "failed to allocate fb\n"); 190 /* note: if fb creation failed, we can't rely on fb destroy 191 * to unref the bo: 192 */ 193 drm_gem_object_unreference(fbdev->bo); 194 ret = PTR_ERR(fb); 195 goto fail; 196 } 197 198 /* note: this keeps the bo pinned.. which is perhaps not ideal, 199 * but is needed as long as we use fb_mmap() to mmap to userspace 200 * (since this happens using fix.smem_start). Possibly we could 201 * implement our own mmap using GEM mmap support to avoid this 202 * (non-tiled buffer doesn't need to be pinned for fbcon to write 203 * to it). Then we just need to be sure that we are able to re- 204 * pin it in case of an opps. 205 */ 206 ret = omap_gem_get_paddr(fbdev->bo, &paddr, true); 207 if (ret) { 208 dev_err(dev->dev, 209 "could not map (paddr)! Skipping framebuffer alloc\n"); 210 ret = -ENOMEM; 211 goto fail; 212 } 213 214 mutex_lock(&dev->struct_mutex); 215 216 fbi = framebuffer_alloc(0, dev->dev); 217 if (!fbi) { 218 dev_err(dev->dev, "failed to allocate fb info\n"); 219 ret = -ENOMEM; 220 goto fail_unlock; 221 } 222 223 DBG("fbi=%p, dev=%p", fbi, dev); 224 225 fbdev->fb = fb; 226 helper->fb = fb; 227 helper->fbdev = fbi; 228 229 fbi->par = helper; 230 fbi->flags = FBINFO_DEFAULT; 231 fbi->fbops = &omap_fb_ops; 232 233 strcpy(fbi->fix.id, MODULE_NAME); 234 235 ret = fb_alloc_cmap(&fbi->cmap, 256, 0); 236 if (ret) { 237 ret = -ENOMEM; 238 goto fail_unlock; 239 } 240 241 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); 242 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); 243 244 dev->mode_config.fb_base = paddr; 245 246 fbi->screen_base = omap_gem_vaddr(fbdev->bo); 247 fbi->screen_size = fbdev->bo->size; 248 fbi->fix.smem_start = paddr; 249 fbi->fix.smem_len = fbdev->bo->size; 250 251 /* if we have DMM, then we can use it for scrolling by just 252 * shuffling pages around in DMM rather than doing sw blit. 253 */ 254 if (fbdev->ywrap_enabled) { 255 DRM_INFO("Enabling DMM ywrap scrolling\n"); 256 fbi->flags |= FBINFO_HWACCEL_YWRAP | FBINFO_READS_FAST; 257 fbi->fix.ywrapstep = 1; 258 } 259 260 261 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); 262 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); 263 264 mutex_unlock(&dev->struct_mutex); 265 266 return 0; 267 268 fail_unlock: 269 mutex_unlock(&dev->struct_mutex); 270 fail: 271 272 if (ret) { 273 if (fbi) 274 framebuffer_release(fbi); 275 if (fb) { 276 drm_framebuffer_unregister_private(fb); 277 drm_framebuffer_remove(fb); 278 } 279 } 280 281 return ret; 282 } 283 284 static struct drm_fb_helper_funcs omap_fb_helper_funcs = { 285 .fb_probe = omap_fbdev_create, 286 }; 287 288 static struct drm_fb_helper *get_fb(struct fb_info *fbi) 289 { 290 if (!fbi || strcmp(fbi->fix.id, MODULE_NAME)) { 291 /* these are not the fb's you're looking for */ 292 return NULL; 293 } 294 return fbi->par; 295 } 296 297 /* flush an area of the framebuffer (in case of manual update display that 298 * is not automatically flushed) 299 */ 300 static void omap_fbdev_flush(struct fb_info *fbi, int x, int y, int w, int h) 301 { 302 struct drm_fb_helper *helper = get_fb(fbi); 303 304 if (!helper) 305 return; 306 307 VERB("flush fbdev: %d,%d %dx%d, fbi=%p", x, y, w, h, fbi); 308 309 omap_framebuffer_flush(helper->fb, x, y, w, h); 310 } 311 312 /* initialize fbdev helper */ 313 struct drm_fb_helper *omap_fbdev_init(struct drm_device *dev) 314 { 315 struct omap_drm_private *priv = dev->dev_private; 316 struct omap_fbdev *fbdev = NULL; 317 struct drm_fb_helper *helper; 318 int ret = 0; 319 320 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 321 if (!fbdev) 322 goto fail; 323 324 INIT_WORK(&fbdev->work, pan_worker); 325 326 helper = &fbdev->base; 327 328 helper->funcs = &omap_fb_helper_funcs; 329 330 ret = drm_fb_helper_init(dev, helper, 331 priv->num_crtcs, priv->num_connectors); 332 if (ret) { 333 dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret); 334 goto fail; 335 } 336 337 drm_fb_helper_single_add_all_connectors(helper); 338 339 /* disable all the possible outputs/crtcs before entering KMS mode */ 340 drm_helper_disable_unused_functions(dev); 341 342 drm_fb_helper_initial_config(helper, 32); 343 344 priv->fbdev = helper; 345 346 return helper; 347 348 fail: 349 kfree(fbdev); 350 return NULL; 351 } 352 353 void omap_fbdev_free(struct drm_device *dev) 354 { 355 struct omap_drm_private *priv = dev->dev_private; 356 struct drm_fb_helper *helper = priv->fbdev; 357 struct omap_fbdev *fbdev; 358 struct fb_info *fbi; 359 360 DBG(); 361 362 fbi = helper->fbdev; 363 364 /* only cleanup framebuffer if it is present */ 365 if (fbi) { 366 unregister_framebuffer(fbi); 367 framebuffer_release(fbi); 368 } 369 370 drm_fb_helper_fini(helper); 371 372 fbdev = to_omap_fbdev(priv->fbdev); 373 374 /* release the ref taken in omap_fbdev_create() */ 375 omap_gem_put_paddr(fbdev->bo); 376 377 /* this will free the backing object */ 378 if (fbdev->fb) { 379 drm_framebuffer_unregister_private(fbdev->fb); 380 drm_framebuffer_remove(fbdev->fb); 381 } 382 383 kfree(fbdev); 384 385 priv->fbdev = NULL; 386 } 387