1 /* exynos_drm_fbdev.c 2 * 3 * Copyright (c) 2011 Samsung Electronics Co., Ltd. 4 * Authors: 5 * Inki Dae <inki.dae@samsung.com> 6 * Joonyoung Shim <jy0922.shim@samsung.com> 7 * Seung-Woo Kim <sw0312.kim@samsung.com> 8 * 9 * Permission is hereby granted, free of charge, to any person obtaining a 10 * copy of this software and associated documentation files (the "Software"), 11 * to deal in the Software without restriction, including without limitation 12 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 13 * and/or sell copies of the Software, and to permit persons to whom the 14 * Software is furnished to do so, subject to the following conditions: 15 * 16 * The above copyright notice and this permission notice (including the next 17 * paragraph) shall be included in all copies or substantial portions of the 18 * Software. 19 * 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 23 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 26 * OTHER DEALINGS IN THE SOFTWARE. 27 */ 28 29 #include <drm/drmP.h> 30 #include <drm/drm_crtc.h> 31 #include <drm/drm_fb_helper.h> 32 #include <drm/drm_crtc_helper.h> 33 34 #include "exynos_drm_drv.h" 35 #include "exynos_drm_fb.h" 36 #include "exynos_drm_gem.h" 37 38 #define MAX_CONNECTOR 4 39 #define PREFERRED_BPP 32 40 41 #define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\ 42 drm_fb_helper) 43 44 struct exynos_drm_fbdev { 45 struct drm_fb_helper drm_fb_helper; 46 struct exynos_drm_gem_obj *exynos_gem_obj; 47 }; 48 49 static int exynos_drm_fb_mmap(struct fb_info *info, 50 struct vm_area_struct *vma) 51 { 52 struct drm_fb_helper *helper = info->par; 53 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper); 54 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj; 55 struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer; 56 unsigned long vm_size; 57 int ret; 58 59 DRM_DEBUG_KMS("%s\n", __func__); 60 61 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 62 63 vm_size = vma->vm_end - vma->vm_start; 64 65 if (vm_size > buffer->size) 66 return -EINVAL; 67 68 ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages, 69 buffer->dma_addr, buffer->size, &buffer->dma_attrs); 70 if (ret < 0) { 71 DRM_ERROR("failed to mmap.\n"); 72 return ret; 73 } 74 75 return 0; 76 } 77 78 static struct fb_ops exynos_drm_fb_ops = { 79 .owner = THIS_MODULE, 80 .fb_mmap = exynos_drm_fb_mmap, 81 .fb_fillrect = cfb_fillrect, 82 .fb_copyarea = cfb_copyarea, 83 .fb_imageblit = cfb_imageblit, 84 .fb_check_var = drm_fb_helper_check_var, 85 .fb_set_par = drm_fb_helper_set_par, 86 .fb_blank = drm_fb_helper_blank, 87 .fb_pan_display = drm_fb_helper_pan_display, 88 .fb_setcmap = drm_fb_helper_setcmap, 89 }; 90 91 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper, 92 struct drm_framebuffer *fb) 93 { 94 struct fb_info *fbi = helper->fbdev; 95 struct drm_device *dev = helper->dev; 96 struct exynos_drm_gem_buf *buffer; 97 unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3); 98 unsigned long offset; 99 100 DRM_DEBUG_KMS("%s\n", __FILE__); 101 102 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); 103 drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height); 104 105 /* RGB formats use only one buffer */ 106 buffer = exynos_drm_fb_buffer(fb, 0); 107 if (!buffer) { 108 DRM_LOG_KMS("buffer is null.\n"); 109 return -EFAULT; 110 } 111 112 /* map pages with kernel virtual space. */ 113 if (!buffer->kvaddr) { 114 unsigned int nr_pages = buffer->size >> PAGE_SHIFT; 115 buffer->kvaddr = vmap(buffer->pages, nr_pages, VM_MAP, 116 pgprot_writecombine(PAGE_KERNEL)); 117 if (!buffer->kvaddr) { 118 DRM_ERROR("failed to map pages to kernel space.\n"); 119 return -EIO; 120 } 121 } 122 123 /* buffer count to framebuffer always is 1 at booting time. */ 124 exynos_drm_fb_set_buf_cnt(fb, 1); 125 126 offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3); 127 offset += fbi->var.yoffset * fb->pitches[0]; 128 129 dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr; 130 fbi->screen_base = buffer->kvaddr + offset; 131 fbi->fix.smem_start = (unsigned long) 132 (page_to_phys(sg_page(buffer->sgt->sgl)) + offset); 133 fbi->screen_size = size; 134 fbi->fix.smem_len = size; 135 136 return 0; 137 } 138 139 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 140 struct drm_fb_helper_surface_size *sizes) 141 { 142 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper); 143 struct exynos_drm_gem_obj *exynos_gem_obj; 144 struct drm_device *dev = helper->dev; 145 struct fb_info *fbi; 146 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 147 struct platform_device *pdev = dev->platformdev; 148 unsigned long size; 149 int ret; 150 151 DRM_DEBUG_KMS("%s\n", __FILE__); 152 153 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", 154 sizes->surface_width, sizes->surface_height, 155 sizes->surface_bpp); 156 157 mode_cmd.width = sizes->surface_width; 158 mode_cmd.height = sizes->surface_height; 159 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 160 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 161 sizes->surface_depth); 162 163 mutex_lock(&dev->struct_mutex); 164 165 fbi = framebuffer_alloc(0, &pdev->dev); 166 if (!fbi) { 167 DRM_ERROR("failed to allocate fb info.\n"); 168 ret = -ENOMEM; 169 goto out; 170 } 171 172 size = mode_cmd.pitches[0] * mode_cmd.height; 173 174 /* 0 means to allocate physically continuous memory */ 175 exynos_gem_obj = exynos_drm_gem_create(dev, 0, size); 176 if (IS_ERR(exynos_gem_obj)) { 177 ret = PTR_ERR(exynos_gem_obj); 178 goto err_release_framebuffer; 179 } 180 181 exynos_fbdev->exynos_gem_obj = exynos_gem_obj; 182 183 helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd, 184 &exynos_gem_obj->base); 185 if (IS_ERR_OR_NULL(helper->fb)) { 186 DRM_ERROR("failed to create drm framebuffer.\n"); 187 ret = PTR_ERR(helper->fb); 188 goto err_destroy_gem; 189 } 190 191 helper->fbdev = fbi; 192 193 fbi->par = helper; 194 fbi->flags = FBINFO_FLAG_DEFAULT; 195 fbi->fbops = &exynos_drm_fb_ops; 196 197 ret = fb_alloc_cmap(&fbi->cmap, 256, 0); 198 if (ret) { 199 DRM_ERROR("failed to allocate cmap.\n"); 200 goto err_destroy_framebuffer; 201 } 202 203 ret = exynos_drm_fbdev_update(helper, helper->fb); 204 if (ret < 0) 205 goto err_dealloc_cmap; 206 207 mutex_unlock(&dev->struct_mutex); 208 return ret; 209 210 err_dealloc_cmap: 211 fb_dealloc_cmap(&fbi->cmap); 212 err_destroy_framebuffer: 213 drm_framebuffer_cleanup(helper->fb); 214 err_destroy_gem: 215 exynos_drm_gem_destroy(exynos_gem_obj); 216 err_release_framebuffer: 217 framebuffer_release(fbi); 218 219 /* 220 * if failed, all resources allocated above would be released by 221 * drm_mode_config_cleanup() when drm_load() had been called prior 222 * to any specific driver such as fimd or hdmi driver. 223 */ 224 out: 225 mutex_unlock(&dev->struct_mutex); 226 return ret; 227 } 228 229 static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper, 230 struct drm_fb_helper_surface_size *sizes) 231 { 232 int ret = 0; 233 234 DRM_DEBUG_KMS("%s\n", __FILE__); 235 236 /* 237 * with !helper->fb, it means that this funcion is called first time 238 * and after that, the helper->fb would be used as clone mode. 239 */ 240 if (!helper->fb) { 241 ret = exynos_drm_fbdev_create(helper, sizes); 242 if (ret < 0) { 243 DRM_ERROR("failed to create fbdev.\n"); 244 return ret; 245 } 246 247 /* 248 * fb_helper expects a value more than 1 if succeed 249 * because register_framebuffer() should be called. 250 */ 251 ret = 1; 252 } 253 254 return ret; 255 } 256 257 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 258 .fb_probe = exynos_drm_fbdev_probe, 259 }; 260 261 int exynos_drm_fbdev_init(struct drm_device *dev) 262 { 263 struct exynos_drm_fbdev *fbdev; 264 struct exynos_drm_private *private = dev->dev_private; 265 struct drm_fb_helper *helper; 266 unsigned int num_crtc; 267 int ret; 268 269 DRM_DEBUG_KMS("%s\n", __FILE__); 270 271 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector) 272 return 0; 273 274 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 275 if (!fbdev) { 276 DRM_ERROR("failed to allocate drm fbdev.\n"); 277 return -ENOMEM; 278 } 279 280 private->fb_helper = helper = &fbdev->drm_fb_helper; 281 helper->funcs = &exynos_drm_fb_helper_funcs; 282 283 num_crtc = dev->mode_config.num_crtc; 284 285 ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR); 286 if (ret < 0) { 287 DRM_ERROR("failed to initialize drm fb helper.\n"); 288 goto err_init; 289 } 290 291 ret = drm_fb_helper_single_add_all_connectors(helper); 292 if (ret < 0) { 293 DRM_ERROR("failed to register drm_fb_helper_connector.\n"); 294 goto err_setup; 295 296 } 297 298 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 299 if (ret < 0) { 300 DRM_ERROR("failed to set up hw configuration.\n"); 301 goto err_setup; 302 } 303 304 return 0; 305 306 err_setup: 307 drm_fb_helper_fini(helper); 308 309 err_init: 310 private->fb_helper = NULL; 311 kfree(fbdev); 312 313 return ret; 314 } 315 316 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 317 struct drm_fb_helper *fb_helper) 318 { 319 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper); 320 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj; 321 struct drm_framebuffer *fb; 322 323 if (exynos_gem_obj->buffer->kvaddr) 324 vunmap(exynos_gem_obj->buffer->kvaddr); 325 326 /* release drm framebuffer and real buffer */ 327 if (fb_helper->fb && fb_helper->fb->funcs) { 328 fb = fb_helper->fb; 329 if (fb) 330 drm_framebuffer_remove(fb); 331 } 332 333 /* release linux framebuffer */ 334 if (fb_helper->fbdev) { 335 struct fb_info *info; 336 int ret; 337 338 info = fb_helper->fbdev; 339 ret = unregister_framebuffer(info); 340 if (ret < 0) 341 DRM_DEBUG_KMS("failed unregister_framebuffer()\n"); 342 343 if (info->cmap.len) 344 fb_dealloc_cmap(&info->cmap); 345 346 framebuffer_release(info); 347 } 348 349 drm_fb_helper_fini(fb_helper); 350 } 351 352 void exynos_drm_fbdev_fini(struct drm_device *dev) 353 { 354 struct exynos_drm_private *private = dev->dev_private; 355 struct exynos_drm_fbdev *fbdev; 356 357 if (!private || !private->fb_helper) 358 return; 359 360 fbdev = to_exynos_fbdev(private->fb_helper); 361 362 if (fbdev->exynos_gem_obj) 363 exynos_drm_gem_destroy(fbdev->exynos_gem_obj); 364 365 exynos_drm_fbdev_destroy(dev, private->fb_helper); 366 kfree(fbdev); 367 private->fb_helper = NULL; 368 } 369 370 void exynos_drm_fbdev_restore_mode(struct drm_device *dev) 371 { 372 struct exynos_drm_private *private = dev->dev_private; 373 374 if (!private || !private->fb_helper) 375 return; 376 377 drm_fb_helper_restore_fbdev_mode(private->fb_helper); 378 } 379