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_fb_helper_surface_size *sizes, 80 struct drm_framebuffer *fb) 81 { 82 struct fb_info *fbi = helper->fbdev; 83 struct exynos_drm_gem_buf *buffer; 84 unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3); 85 unsigned int nr_pages; 86 unsigned long offset; 87 88 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); 89 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); 90 91 /* RGB formats use only one buffer */ 92 buffer = exynos_drm_fb_buffer(fb, 0); 93 if (!buffer) { 94 DRM_DEBUG_KMS("buffer is null.\n"); 95 return -EFAULT; 96 } 97 98 nr_pages = buffer->size >> PAGE_SHIFT; 99 100 buffer->kvaddr = (void __iomem *) vmap(buffer->pages, 101 nr_pages, VM_MAP, 102 pgprot_writecombine(PAGE_KERNEL)); 103 if (!buffer->kvaddr) { 104 DRM_ERROR("failed to map pages to kernel space.\n"); 105 return -EIO; 106 } 107 108 /* buffer count to framebuffer always is 1 at booting time. */ 109 exynos_drm_fb_set_buf_cnt(fb, 1); 110 111 offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3); 112 offset += fbi->var.yoffset * fb->pitches[0]; 113 114 fbi->screen_base = buffer->kvaddr + offset; 115 fbi->screen_size = size; 116 fbi->fix.smem_len = size; 117 118 return 0; 119 } 120 121 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 122 struct drm_fb_helper_surface_size *sizes) 123 { 124 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper); 125 struct exynos_drm_gem_obj *exynos_gem_obj; 126 struct drm_device *dev = helper->dev; 127 struct fb_info *fbi; 128 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 129 struct platform_device *pdev = dev->platformdev; 130 unsigned long size; 131 int ret; 132 133 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", 134 sizes->surface_width, sizes->surface_height, 135 sizes->surface_bpp); 136 137 mode_cmd.width = sizes->surface_width; 138 mode_cmd.height = sizes->surface_height; 139 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 140 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 141 sizes->surface_depth); 142 143 mutex_lock(&dev->struct_mutex); 144 145 fbi = framebuffer_alloc(0, &pdev->dev); 146 if (!fbi) { 147 DRM_ERROR("failed to allocate fb info.\n"); 148 ret = -ENOMEM; 149 goto out; 150 } 151 152 size = mode_cmd.pitches[0] * mode_cmd.height; 153 154 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size); 155 /* 156 * If physically contiguous memory allocation fails and if IOMMU is 157 * supported then try to get buffer from non physically contiguous 158 * memory area. 159 */ 160 if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) { 161 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n"); 162 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG, 163 size); 164 } 165 166 if (IS_ERR(exynos_gem_obj)) { 167 ret = PTR_ERR(exynos_gem_obj); 168 goto err_release_framebuffer; 169 } 170 171 exynos_fbdev->exynos_gem_obj = exynos_gem_obj; 172 173 helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd, 174 &exynos_gem_obj->base); 175 if (IS_ERR(helper->fb)) { 176 DRM_ERROR("failed to create drm framebuffer.\n"); 177 ret = PTR_ERR(helper->fb); 178 goto err_destroy_gem; 179 } 180 181 helper->fbdev = fbi; 182 183 fbi->par = helper; 184 fbi->flags = FBINFO_FLAG_DEFAULT; 185 fbi->fbops = &exynos_drm_fb_ops; 186 187 ret = fb_alloc_cmap(&fbi->cmap, 256, 0); 188 if (ret) { 189 DRM_ERROR("failed to allocate cmap.\n"); 190 goto err_destroy_framebuffer; 191 } 192 193 ret = exynos_drm_fbdev_update(helper, sizes, helper->fb); 194 if (ret < 0) 195 goto err_dealloc_cmap; 196 197 mutex_unlock(&dev->struct_mutex); 198 return ret; 199 200 err_dealloc_cmap: 201 fb_dealloc_cmap(&fbi->cmap); 202 err_destroy_framebuffer: 203 drm_framebuffer_cleanup(helper->fb); 204 err_destroy_gem: 205 exynos_drm_gem_destroy(exynos_gem_obj); 206 err_release_framebuffer: 207 framebuffer_release(fbi); 208 209 /* 210 * if failed, all resources allocated above would be released by 211 * drm_mode_config_cleanup() when drm_load() had been called prior 212 * to any specific driver such as fimd or hdmi driver. 213 */ 214 out: 215 mutex_unlock(&dev->struct_mutex); 216 return ret; 217 } 218 219 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 220 .fb_probe = exynos_drm_fbdev_create, 221 }; 222 223 static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev) 224 { 225 struct drm_connector *connector; 226 bool ret = false; 227 228 mutex_lock(&dev->mode_config.mutex); 229 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 230 if (connector->status != connector_status_connected) 231 continue; 232 233 ret = true; 234 break; 235 } 236 mutex_unlock(&dev->mode_config.mutex); 237 238 return ret; 239 } 240 241 int exynos_drm_fbdev_init(struct drm_device *dev) 242 { 243 struct exynos_drm_fbdev *fbdev; 244 struct exynos_drm_private *private = dev->dev_private; 245 struct drm_fb_helper *helper; 246 unsigned int num_crtc; 247 int ret; 248 249 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector) 250 return 0; 251 252 if (!exynos_drm_fbdev_is_anything_connected(dev)) 253 return 0; 254 255 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 256 if (!fbdev) 257 return -ENOMEM; 258 259 private->fb_helper = helper = &fbdev->drm_fb_helper; 260 261 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs); 262 263 num_crtc = dev->mode_config.num_crtc; 264 265 ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR); 266 if (ret < 0) { 267 DRM_ERROR("failed to initialize drm fb helper.\n"); 268 goto err_init; 269 } 270 271 ret = drm_fb_helper_single_add_all_connectors(helper); 272 if (ret < 0) { 273 DRM_ERROR("failed to register drm_fb_helper_connector.\n"); 274 goto err_setup; 275 276 } 277 278 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 279 if (ret < 0) { 280 DRM_ERROR("failed to set up hw configuration.\n"); 281 goto err_setup; 282 } 283 284 return 0; 285 286 err_setup: 287 drm_fb_helper_fini(helper); 288 289 err_init: 290 private->fb_helper = NULL; 291 kfree(fbdev); 292 293 return ret; 294 } 295 296 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 297 struct drm_fb_helper *fb_helper) 298 { 299 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper); 300 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj; 301 struct drm_framebuffer *fb; 302 303 if (exynos_gem_obj->buffer->kvaddr) 304 vunmap(exynos_gem_obj->buffer->kvaddr); 305 306 /* release drm framebuffer and real buffer */ 307 if (fb_helper->fb && fb_helper->fb->funcs) { 308 fb = fb_helper->fb; 309 if (fb) { 310 drm_framebuffer_unregister_private(fb); 311 drm_framebuffer_remove(fb); 312 } 313 } 314 315 /* release linux framebuffer */ 316 if (fb_helper->fbdev) { 317 struct fb_info *info; 318 int ret; 319 320 info = fb_helper->fbdev; 321 ret = unregister_framebuffer(info); 322 if (ret < 0) 323 DRM_DEBUG_KMS("failed unregister_framebuffer()\n"); 324 325 if (info->cmap.len) 326 fb_dealloc_cmap(&info->cmap); 327 328 framebuffer_release(info); 329 } 330 331 drm_fb_helper_fini(fb_helper); 332 } 333 334 void exynos_drm_fbdev_fini(struct drm_device *dev) 335 { 336 struct exynos_drm_private *private = dev->dev_private; 337 struct exynos_drm_fbdev *fbdev; 338 339 if (!private || !private->fb_helper) 340 return; 341 342 fbdev = to_exynos_fbdev(private->fb_helper); 343 344 exynos_drm_fbdev_destroy(dev, private->fb_helper); 345 kfree(fbdev); 346 private->fb_helper = NULL; 347 } 348 349 void exynos_drm_fbdev_restore_mode(struct drm_device *dev) 350 { 351 struct exynos_drm_private *private = dev->dev_private; 352 353 if (!private || !private->fb_helper) 354 return; 355 356 drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper); 357 } 358