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 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 */ 14 15 #include <drm/drmP.h> 16 #include <drm/drm_crtc.h> 17 #include <drm/drm_fb_helper.h> 18 #include <drm/drm_crtc_helper.h> 19 20 #include "exynos_drm_drv.h" 21 #include "exynos_drm_fb.h" 22 #include "exynos_drm_gem.h" 23 #include "exynos_drm_iommu.h" 24 25 #define MAX_CONNECTOR 4 26 #define PREFERRED_BPP 32 27 28 #define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\ 29 drm_fb_helper) 30 31 struct exynos_drm_fbdev { 32 struct drm_fb_helper drm_fb_helper; 33 struct exynos_drm_gem_obj *exynos_gem_obj; 34 }; 35 36 static int exynos_drm_fb_mmap(struct fb_info *info, 37 struct vm_area_struct *vma) 38 { 39 struct drm_fb_helper *helper = info->par; 40 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper); 41 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj; 42 struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer; 43 unsigned long vm_size; 44 int ret; 45 46 DRM_DEBUG_KMS("%s\n", __func__); 47 48 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 49 50 vm_size = vma->vm_end - vma->vm_start; 51 52 if (vm_size > buffer->size) 53 return -EINVAL; 54 55 ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages, 56 buffer->dma_addr, buffer->size, &buffer->dma_attrs); 57 if (ret < 0) { 58 DRM_ERROR("failed to mmap.\n"); 59 return ret; 60 } 61 62 return 0; 63 } 64 65 static struct fb_ops exynos_drm_fb_ops = { 66 .owner = THIS_MODULE, 67 .fb_mmap = exynos_drm_fb_mmap, 68 .fb_fillrect = cfb_fillrect, 69 .fb_copyarea = cfb_copyarea, 70 .fb_imageblit = cfb_imageblit, 71 .fb_check_var = drm_fb_helper_check_var, 72 .fb_set_par = drm_fb_helper_set_par, 73 .fb_blank = drm_fb_helper_blank, 74 .fb_pan_display = drm_fb_helper_pan_display, 75 .fb_setcmap = drm_fb_helper_setcmap, 76 }; 77 78 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper, 79 struct drm_framebuffer *fb) 80 { 81 struct fb_info *fbi = helper->fbdev; 82 struct drm_device *dev = helper->dev; 83 struct exynos_drm_gem_buf *buffer; 84 unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3); 85 unsigned long offset; 86 87 DRM_DEBUG_KMS("%s\n", __FILE__); 88 89 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); 90 drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height); 91 92 /* RGB formats use only one buffer */ 93 buffer = exynos_drm_fb_buffer(fb, 0); 94 if (!buffer) { 95 DRM_LOG_KMS("buffer is null.\n"); 96 return -EFAULT; 97 } 98 99 /* map pages with kernel virtual space. */ 100 if (!buffer->kvaddr) { 101 if (is_drm_iommu_supported(dev)) { 102 unsigned int nr_pages = buffer->size >> PAGE_SHIFT; 103 104 buffer->kvaddr = vmap(buffer->pages, nr_pages, VM_MAP, 105 pgprot_writecombine(PAGE_KERNEL)); 106 } else { 107 phys_addr_t dma_addr = buffer->dma_addr; 108 if (dma_addr) 109 buffer->kvaddr = phys_to_virt(dma_addr); 110 else 111 buffer->kvaddr = (void __iomem *)NULL; 112 } 113 if (!buffer->kvaddr) { 114 DRM_ERROR("failed to map pages to kernel space.\n"); 115 return -EIO; 116 } 117 } 118 119 /* buffer count to framebuffer always is 1 at booting time. */ 120 exynos_drm_fb_set_buf_cnt(fb, 1); 121 122 offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3); 123 offset += fbi->var.yoffset * fb->pitches[0]; 124 125 dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr; 126 fbi->screen_base = buffer->kvaddr + offset; 127 if (is_drm_iommu_supported(dev)) 128 fbi->fix.smem_start = (unsigned long) 129 (page_to_phys(sg_page(buffer->sgt->sgl)) + offset); 130 else 131 fbi->fix.smem_start = (unsigned long)buffer->dma_addr; 132 133 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 (is_drm_iommu_supported(dev) && 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