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 exynos_drm_gem_buf *buffer; 83 unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3); 84 unsigned int nr_pages; 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 nr_pages = buffer->size >> PAGE_SHIFT; 98 99 buffer->kvaddr = (void __iomem *) vmap(buffer->pages, 100 nr_pages, VM_MAP, 101 pgprot_writecombine(PAGE_KERNEL)); 102 if (!buffer->kvaddr) { 103 DRM_ERROR("failed to map pages to kernel space.\n"); 104 return -EIO; 105 } 106 107 /* buffer count to framebuffer always is 1 at booting time. */ 108 exynos_drm_fb_set_buf_cnt(fb, 1); 109 110 offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3); 111 offset += fbi->var.yoffset * fb->pitches[0]; 112 113 fbi->screen_base = buffer->kvaddr + offset; 114 fbi->screen_size = size; 115 fbi->fix.smem_len = size; 116 117 return 0; 118 } 119 120 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 121 struct drm_fb_helper_surface_size *sizes) 122 { 123 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper); 124 struct exynos_drm_gem_obj *exynos_gem_obj; 125 struct drm_device *dev = helper->dev; 126 struct fb_info *fbi; 127 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 128 struct platform_device *pdev = dev->platformdev; 129 unsigned long size; 130 int ret; 131 132 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", 133 sizes->surface_width, sizes->surface_height, 134 sizes->surface_bpp); 135 136 mode_cmd.width = sizes->surface_width; 137 mode_cmd.height = sizes->surface_height; 138 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 139 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 140 sizes->surface_depth); 141 142 mutex_lock(&dev->struct_mutex); 143 144 fbi = framebuffer_alloc(0, &pdev->dev); 145 if (!fbi) { 146 DRM_ERROR("failed to allocate fb info.\n"); 147 ret = -ENOMEM; 148 goto out; 149 } 150 151 size = mode_cmd.pitches[0] * mode_cmd.height; 152 153 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size); 154 /* 155 * If physically contiguous memory allocation fails and if IOMMU is 156 * supported then try to get buffer from non physically contiguous 157 * memory area. 158 */ 159 if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) { 160 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n"); 161 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG, 162 size); 163 } 164 165 if (IS_ERR(exynos_gem_obj)) { 166 ret = PTR_ERR(exynos_gem_obj); 167 goto err_release_framebuffer; 168 } 169 170 exynos_fbdev->exynos_gem_obj = exynos_gem_obj; 171 172 helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd, 173 &exynos_gem_obj->base); 174 if (IS_ERR(helper->fb)) { 175 DRM_ERROR("failed to create drm framebuffer.\n"); 176 ret = PTR_ERR(helper->fb); 177 goto err_destroy_gem; 178 } 179 180 helper->fbdev = fbi; 181 182 fbi->par = helper; 183 fbi->flags = FBINFO_FLAG_DEFAULT; 184 fbi->fbops = &exynos_drm_fb_ops; 185 186 ret = fb_alloc_cmap(&fbi->cmap, 256, 0); 187 if (ret) { 188 DRM_ERROR("failed to allocate cmap.\n"); 189 goto err_destroy_framebuffer; 190 } 191 192 ret = exynos_drm_fbdev_update(helper, helper->fb); 193 if (ret < 0) 194 goto err_dealloc_cmap; 195 196 mutex_unlock(&dev->struct_mutex); 197 return ret; 198 199 err_dealloc_cmap: 200 fb_dealloc_cmap(&fbi->cmap); 201 err_destroy_framebuffer: 202 drm_framebuffer_cleanup(helper->fb); 203 err_destroy_gem: 204 exynos_drm_gem_destroy(exynos_gem_obj); 205 err_release_framebuffer: 206 framebuffer_release(fbi); 207 208 /* 209 * if failed, all resources allocated above would be released by 210 * drm_mode_config_cleanup() when drm_load() had been called prior 211 * to any specific driver such as fimd or hdmi driver. 212 */ 213 out: 214 mutex_unlock(&dev->struct_mutex); 215 return ret; 216 } 217 218 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 219 .fb_probe = exynos_drm_fbdev_create, 220 }; 221 222 static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev) 223 { 224 struct drm_connector *connector; 225 bool ret = false; 226 227 mutex_lock(&dev->mode_config.mutex); 228 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 229 if (connector->status != connector_status_connected) 230 continue; 231 232 ret = true; 233 break; 234 } 235 mutex_unlock(&dev->mode_config.mutex); 236 237 return ret; 238 } 239 240 int exynos_drm_fbdev_init(struct drm_device *dev) 241 { 242 struct exynos_drm_fbdev *fbdev; 243 struct exynos_drm_private *private = dev->dev_private; 244 struct drm_fb_helper *helper; 245 unsigned int num_crtc; 246 int ret; 247 248 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector) 249 return 0; 250 251 if (!exynos_drm_fbdev_is_anything_connected(dev)) 252 return 0; 253 254 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 255 if (!fbdev) 256 return -ENOMEM; 257 258 private->fb_helper = helper = &fbdev->drm_fb_helper; 259 260 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs); 261 262 num_crtc = dev->mode_config.num_crtc; 263 264 ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR); 265 if (ret < 0) { 266 DRM_ERROR("failed to initialize drm fb helper.\n"); 267 goto err_init; 268 } 269 270 ret = drm_fb_helper_single_add_all_connectors(helper); 271 if (ret < 0) { 272 DRM_ERROR("failed to register drm_fb_helper_connector.\n"); 273 goto err_setup; 274 275 } 276 277 /* disable all the possible outputs/crtcs before entering KMS mode */ 278 drm_helper_disable_unused_functions(dev); 279 280 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 281 if (ret < 0) { 282 DRM_ERROR("failed to set up hw configuration.\n"); 283 goto err_setup; 284 } 285 286 return 0; 287 288 err_setup: 289 drm_fb_helper_fini(helper); 290 291 err_init: 292 private->fb_helper = NULL; 293 kfree(fbdev); 294 295 return ret; 296 } 297 298 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 299 struct drm_fb_helper *fb_helper) 300 { 301 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper); 302 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj; 303 struct drm_framebuffer *fb; 304 305 if (exynos_gem_obj->buffer->kvaddr) 306 vunmap(exynos_gem_obj->buffer->kvaddr); 307 308 /* release drm framebuffer and real buffer */ 309 if (fb_helper->fb && fb_helper->fb->funcs) { 310 fb = fb_helper->fb; 311 if (fb) { 312 drm_framebuffer_unregister_private(fb); 313 drm_framebuffer_remove(fb); 314 } 315 } 316 317 /* release linux framebuffer */ 318 if (fb_helper->fbdev) { 319 struct fb_info *info; 320 int ret; 321 322 info = fb_helper->fbdev; 323 ret = unregister_framebuffer(info); 324 if (ret < 0) 325 DRM_DEBUG_KMS("failed unregister_framebuffer()\n"); 326 327 if (info->cmap.len) 328 fb_dealloc_cmap(&info->cmap); 329 330 framebuffer_release(info); 331 } 332 333 drm_fb_helper_fini(fb_helper); 334 } 335 336 void exynos_drm_fbdev_fini(struct drm_device *dev) 337 { 338 struct exynos_drm_private *private = dev->dev_private; 339 struct exynos_drm_fbdev *fbdev; 340 341 if (!private || !private->fb_helper) 342 return; 343 344 fbdev = to_exynos_fbdev(private->fb_helper); 345 346 exynos_drm_fbdev_destroy(dev, private->fb_helper); 347 kfree(fbdev); 348 private->fb_helper = NULL; 349 } 350 351 void exynos_drm_fbdev_restore_mode(struct drm_device *dev) 352 { 353 struct exynos_drm_private *private = dev->dev_private; 354 355 if (!private || !private->fb_helper) 356 return; 357 358 drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper); 359 } 360