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 #include <drm/exynos_drm.h> 20 21 #include "exynos_drm_drv.h" 22 #include "exynos_drm_fb.h" 23 #include "exynos_drm_fbdev.h" 24 #include "exynos_drm_gem.h" 25 #include "exynos_drm_iommu.h" 26 27 #define MAX_CONNECTOR 4 28 #define PREFERRED_BPP 32 29 30 #define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\ 31 drm_fb_helper) 32 33 struct exynos_drm_fbdev { 34 struct drm_fb_helper drm_fb_helper; 35 struct exynos_drm_gem_obj *exynos_gem_obj; 36 }; 37 38 static int exynos_drm_fb_mmap(struct fb_info *info, 39 struct vm_area_struct *vma) 40 { 41 struct drm_fb_helper *helper = info->par; 42 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper); 43 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj; 44 struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer; 45 unsigned long vm_size; 46 int ret; 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_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); 88 drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height); 89 90 /* RGB formats use only one buffer */ 91 buffer = exynos_drm_fb_buffer(fb, 0); 92 if (!buffer) { 93 DRM_DEBUG_KMS("buffer is null.\n"); 94 return -EFAULT; 95 } 96 97 /* map pages with kernel virtual space. */ 98 if (!buffer->kvaddr) { 99 if (is_drm_iommu_supported(dev)) { 100 unsigned int nr_pages = buffer->size >> PAGE_SHIFT; 101 102 buffer->kvaddr = (void __iomem *) vmap(buffer->pages, 103 nr_pages, VM_MAP, 104 pgprot_writecombine(PAGE_KERNEL)); 105 } else { 106 phys_addr_t dma_addr = buffer->dma_addr; 107 if (dma_addr) 108 buffer->kvaddr = (void __iomem *)phys_to_virt(dma_addr); 109 else 110 buffer->kvaddr = (void __iomem *)NULL; 111 } 112 if (!buffer->kvaddr) { 113 DRM_ERROR("failed to map pages to kernel space.\n"); 114 return -EIO; 115 } 116 } 117 118 /* buffer count to framebuffer always is 1 at booting time. */ 119 exynos_drm_fb_set_buf_cnt(fb, 1); 120 121 offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3); 122 offset += fbi->var.yoffset * fb->pitches[0]; 123 124 fbi->screen_base = buffer->kvaddr + offset; 125 fbi->screen_size = size; 126 fbi->fix.smem_len = size; 127 128 return 0; 129 } 130 131 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 132 struct drm_fb_helper_surface_size *sizes) 133 { 134 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper); 135 struct exynos_drm_gem_obj *exynos_gem_obj; 136 struct drm_device *dev = helper->dev; 137 struct fb_info *fbi; 138 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 139 struct platform_device *pdev = dev->platformdev; 140 unsigned long size; 141 int ret; 142 143 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", 144 sizes->surface_width, sizes->surface_height, 145 sizes->surface_bpp); 146 147 mode_cmd.width = sizes->surface_width; 148 mode_cmd.height = sizes->surface_height; 149 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 150 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 151 sizes->surface_depth); 152 153 mutex_lock(&dev->struct_mutex); 154 155 fbi = framebuffer_alloc(0, &pdev->dev); 156 if (!fbi) { 157 DRM_ERROR("failed to allocate fb info.\n"); 158 ret = -ENOMEM; 159 goto out; 160 } 161 162 size = mode_cmd.pitches[0] * mode_cmd.height; 163 164 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size); 165 /* 166 * If physically contiguous memory allocation fails and if IOMMU is 167 * supported then try to get buffer from non physically contiguous 168 * memory area. 169 */ 170 if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) { 171 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n"); 172 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG, 173 size); 174 } 175 176 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(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 const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 230 .fb_probe = exynos_drm_fbdev_create, 231 }; 232 233 static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev) 234 { 235 struct drm_connector *connector; 236 bool ret = false; 237 238 mutex_lock(&dev->mode_config.mutex); 239 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 240 if (connector->status != connector_status_connected) 241 continue; 242 243 ret = true; 244 break; 245 } 246 mutex_unlock(&dev->mode_config.mutex); 247 248 return ret; 249 } 250 251 int exynos_drm_fbdev_init(struct drm_device *dev) 252 { 253 struct exynos_drm_fbdev *fbdev; 254 struct exynos_drm_private *private = dev->dev_private; 255 struct drm_fb_helper *helper; 256 unsigned int num_crtc; 257 int ret; 258 259 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector) 260 return 0; 261 262 if (!exynos_drm_fbdev_is_anything_connected(dev)) 263 return 0; 264 265 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 266 if (!fbdev) 267 return -ENOMEM; 268 269 private->fb_helper = helper = &fbdev->drm_fb_helper; 270 271 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs); 272 273 num_crtc = dev->mode_config.num_crtc; 274 275 ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR); 276 if (ret < 0) { 277 DRM_ERROR("failed to initialize drm fb helper.\n"); 278 goto err_init; 279 } 280 281 ret = drm_fb_helper_single_add_all_connectors(helper); 282 if (ret < 0) { 283 DRM_ERROR("failed to register drm_fb_helper_connector.\n"); 284 goto err_setup; 285 286 } 287 288 /* disable all the possible outputs/crtcs before entering KMS mode */ 289 drm_helper_disable_unused_functions(dev); 290 291 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 292 if (ret < 0) { 293 DRM_ERROR("failed to set up hw configuration.\n"); 294 goto err_setup; 295 } 296 297 return 0; 298 299 err_setup: 300 drm_fb_helper_fini(helper); 301 302 err_init: 303 private->fb_helper = NULL; 304 kfree(fbdev); 305 306 return ret; 307 } 308 309 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 310 struct drm_fb_helper *fb_helper) 311 { 312 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper); 313 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj; 314 struct drm_framebuffer *fb; 315 316 if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr) 317 vunmap(exynos_gem_obj->buffer->kvaddr); 318 319 /* release drm framebuffer and real buffer */ 320 if (fb_helper->fb && fb_helper->fb->funcs) { 321 fb = fb_helper->fb; 322 if (fb) { 323 drm_framebuffer_unregister_private(fb); 324 drm_framebuffer_remove(fb); 325 } 326 } 327 328 /* release linux framebuffer */ 329 if (fb_helper->fbdev) { 330 struct fb_info *info; 331 int ret; 332 333 info = fb_helper->fbdev; 334 ret = unregister_framebuffer(info); 335 if (ret < 0) 336 DRM_DEBUG_KMS("failed unregister_framebuffer()\n"); 337 338 if (info->cmap.len) 339 fb_dealloc_cmap(&info->cmap); 340 341 framebuffer_release(info); 342 } 343 344 drm_fb_helper_fini(fb_helper); 345 } 346 347 void exynos_drm_fbdev_fini(struct drm_device *dev) 348 { 349 struct exynos_drm_private *private = dev->dev_private; 350 struct exynos_drm_fbdev *fbdev; 351 352 if (!private || !private->fb_helper) 353 return; 354 355 fbdev = to_exynos_fbdev(private->fb_helper); 356 357 exynos_drm_fbdev_destroy(dev, private->fb_helper); 358 kfree(fbdev); 359 private->fb_helper = NULL; 360 } 361 362 void exynos_drm_fbdev_restore_mode(struct drm_device *dev) 363 { 364 struct exynos_drm_private *private = dev->dev_private; 365 366 if (!private || !private->fb_helper) 367 return; 368 369 drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper); 370 } 371