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 struct fb_ops exynos_drm_fb_ops = { 50 .owner = THIS_MODULE, 51 .fb_fillrect = cfb_fillrect, 52 .fb_copyarea = cfb_copyarea, 53 .fb_imageblit = cfb_imageblit, 54 .fb_check_var = drm_fb_helper_check_var, 55 .fb_set_par = drm_fb_helper_set_par, 56 .fb_blank = drm_fb_helper_blank, 57 .fb_pan_display = drm_fb_helper_pan_display, 58 .fb_setcmap = drm_fb_helper_setcmap, 59 }; 60 61 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper, 62 struct drm_framebuffer *fb) 63 { 64 struct fb_info *fbi = helper->fbdev; 65 struct drm_device *dev = helper->dev; 66 struct exynos_drm_gem_buf *buffer; 67 unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3); 68 unsigned long offset; 69 70 DRM_DEBUG_KMS("%s\n", __FILE__); 71 72 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); 73 drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height); 74 75 /* RGB formats use only one buffer */ 76 buffer = exynos_drm_fb_buffer(fb, 0); 77 if (!buffer) { 78 DRM_LOG_KMS("buffer is null.\n"); 79 return -EFAULT; 80 } 81 82 /* buffer count to framebuffer always is 1 at booting time. */ 83 exynos_drm_fb_set_buf_cnt(fb, 1); 84 85 offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3); 86 offset += fbi->var.yoffset * fb->pitches[0]; 87 88 dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr; 89 fbi->screen_base = buffer->kvaddr + offset; 90 fbi->fix.smem_start = (unsigned long)(page_to_phys(buffer->pages[0]) + 91 offset); 92 fbi->screen_size = size; 93 fbi->fix.smem_len = size; 94 95 return 0; 96 } 97 98 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 99 struct drm_fb_helper_surface_size *sizes) 100 { 101 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper); 102 struct exynos_drm_gem_obj *exynos_gem_obj; 103 struct drm_device *dev = helper->dev; 104 struct fb_info *fbi; 105 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 106 struct platform_device *pdev = dev->platformdev; 107 unsigned long size; 108 int ret; 109 110 DRM_DEBUG_KMS("%s\n", __FILE__); 111 112 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", 113 sizes->surface_width, sizes->surface_height, 114 sizes->surface_bpp); 115 116 mode_cmd.width = sizes->surface_width; 117 mode_cmd.height = sizes->surface_height; 118 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 119 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 120 sizes->surface_depth); 121 122 mutex_lock(&dev->struct_mutex); 123 124 fbi = framebuffer_alloc(0, &pdev->dev); 125 if (!fbi) { 126 DRM_ERROR("failed to allocate fb info.\n"); 127 ret = -ENOMEM; 128 goto out; 129 } 130 131 size = mode_cmd.pitches[0] * mode_cmd.height; 132 133 /* 0 means to allocate physically continuous memory */ 134 exynos_gem_obj = exynos_drm_gem_create(dev, 0, size); 135 if (IS_ERR(exynos_gem_obj)) { 136 ret = PTR_ERR(exynos_gem_obj); 137 goto out; 138 } 139 140 exynos_fbdev->exynos_gem_obj = exynos_gem_obj; 141 142 helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd, 143 &exynos_gem_obj->base); 144 if (IS_ERR_OR_NULL(helper->fb)) { 145 DRM_ERROR("failed to create drm framebuffer.\n"); 146 ret = PTR_ERR(helper->fb); 147 goto out; 148 } 149 150 helper->fbdev = fbi; 151 152 fbi->par = helper; 153 fbi->flags = FBINFO_FLAG_DEFAULT; 154 fbi->fbops = &exynos_drm_fb_ops; 155 156 ret = fb_alloc_cmap(&fbi->cmap, 256, 0); 157 if (ret) { 158 DRM_ERROR("failed to allocate cmap.\n"); 159 goto out; 160 } 161 162 ret = exynos_drm_fbdev_update(helper, helper->fb); 163 if (ret < 0) { 164 fb_dealloc_cmap(&fbi->cmap); 165 goto out; 166 } 167 168 /* 169 * if failed, all resources allocated above would be released by 170 * drm_mode_config_cleanup() when drm_load() had been called prior 171 * to any specific driver such as fimd or hdmi driver. 172 */ 173 out: 174 mutex_unlock(&dev->struct_mutex); 175 return ret; 176 } 177 178 static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper, 179 struct drm_fb_helper_surface_size *sizes) 180 { 181 int ret = 0; 182 183 DRM_DEBUG_KMS("%s\n", __FILE__); 184 185 /* 186 * with !helper->fb, it means that this funcion is called first time 187 * and after that, the helper->fb would be used as clone mode. 188 */ 189 if (!helper->fb) { 190 ret = exynos_drm_fbdev_create(helper, sizes); 191 if (ret < 0) { 192 DRM_ERROR("failed to create fbdev.\n"); 193 return ret; 194 } 195 196 /* 197 * fb_helper expects a value more than 1 if succeed 198 * because register_framebuffer() should be called. 199 */ 200 ret = 1; 201 } 202 203 return ret; 204 } 205 206 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 207 .fb_probe = exynos_drm_fbdev_probe, 208 }; 209 210 int exynos_drm_fbdev_init(struct drm_device *dev) 211 { 212 struct exynos_drm_fbdev *fbdev; 213 struct exynos_drm_private *private = dev->dev_private; 214 struct drm_fb_helper *helper; 215 unsigned int num_crtc; 216 int ret; 217 218 DRM_DEBUG_KMS("%s\n", __FILE__); 219 220 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector) 221 return 0; 222 223 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 224 if (!fbdev) { 225 DRM_ERROR("failed to allocate drm fbdev.\n"); 226 return -ENOMEM; 227 } 228 229 private->fb_helper = helper = &fbdev->drm_fb_helper; 230 helper->funcs = &exynos_drm_fb_helper_funcs; 231 232 num_crtc = dev->mode_config.num_crtc; 233 234 ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR); 235 if (ret < 0) { 236 DRM_ERROR("failed to initialize drm fb helper.\n"); 237 goto err_init; 238 } 239 240 ret = drm_fb_helper_single_add_all_connectors(helper); 241 if (ret < 0) { 242 DRM_ERROR("failed to register drm_fb_helper_connector.\n"); 243 goto err_setup; 244 245 } 246 247 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 248 if (ret < 0) { 249 DRM_ERROR("failed to set up hw configuration.\n"); 250 goto err_setup; 251 } 252 253 return 0; 254 255 err_setup: 256 drm_fb_helper_fini(helper); 257 258 err_init: 259 private->fb_helper = NULL; 260 kfree(fbdev); 261 262 return ret; 263 } 264 265 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 266 struct drm_fb_helper *fb_helper) 267 { 268 struct drm_framebuffer *fb; 269 270 /* release drm framebuffer and real buffer */ 271 if (fb_helper->fb && fb_helper->fb->funcs) { 272 fb = fb_helper->fb; 273 if (fb) 274 drm_framebuffer_remove(fb); 275 } 276 277 /* release linux framebuffer */ 278 if (fb_helper->fbdev) { 279 struct fb_info *info; 280 int ret; 281 282 info = fb_helper->fbdev; 283 ret = unregister_framebuffer(info); 284 if (ret < 0) 285 DRM_DEBUG_KMS("failed unregister_framebuffer()\n"); 286 287 if (info->cmap.len) 288 fb_dealloc_cmap(&info->cmap); 289 290 framebuffer_release(info); 291 } 292 293 drm_fb_helper_fini(fb_helper); 294 } 295 296 void exynos_drm_fbdev_fini(struct drm_device *dev) 297 { 298 struct exynos_drm_private *private = dev->dev_private; 299 struct exynos_drm_fbdev *fbdev; 300 301 if (!private || !private->fb_helper) 302 return; 303 304 fbdev = to_exynos_fbdev(private->fb_helper); 305 306 if (fbdev->exynos_gem_obj) 307 exynos_drm_gem_destroy(fbdev->exynos_gem_obj); 308 309 exynos_drm_fbdev_destroy(dev, private->fb_helper); 310 kfree(fbdev); 311 private->fb_helper = NULL; 312 } 313 314 void exynos_drm_fbdev_restore_mode(struct drm_device *dev) 315 { 316 struct exynos_drm_private *private = dev->dev_private; 317 318 if (!private || !private->fb_helper) 319 return; 320 321 drm_fb_helper_restore_fbdev_mode(private->fb_helper); 322 } 323