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 *obj = exynos_fbd->exynos_gem_obj; 44 unsigned long vm_size; 45 int ret; 46 47 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 48 49 vm_size = vma->vm_end - vma->vm_start; 50 51 if (vm_size > obj->size) 52 return -EINVAL; 53 54 ret = dma_mmap_attrs(helper->dev->dev, vma, obj->pages, obj->dma_addr, 55 obj->size, &obj->dma_attrs); 56 if (ret < 0) { 57 DRM_ERROR("failed to mmap.\n"); 58 return ret; 59 } 60 61 return 0; 62 } 63 64 static struct fb_ops exynos_drm_fb_ops = { 65 .owner = THIS_MODULE, 66 .fb_mmap = exynos_drm_fb_mmap, 67 .fb_fillrect = drm_fb_helper_cfb_fillrect, 68 .fb_copyarea = drm_fb_helper_cfb_copyarea, 69 .fb_imageblit = drm_fb_helper_cfb_imageblit, 70 .fb_check_var = drm_fb_helper_check_var, 71 .fb_set_par = drm_fb_helper_set_par, 72 .fb_blank = drm_fb_helper_blank, 73 .fb_pan_display = drm_fb_helper_pan_display, 74 .fb_setcmap = drm_fb_helper_setcmap, 75 }; 76 77 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper, 78 struct drm_fb_helper_surface_size *sizes, 79 struct drm_framebuffer *fb) 80 { 81 struct fb_info *fbi = helper->fbdev; 82 struct exynos_drm_gem_obj *obj; 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, sizes->fb_width, sizes->fb_height); 89 90 /* RGB formats use only one buffer */ 91 obj = exynos_drm_fb_gem_obj(fb, 0); 92 if (!obj) { 93 DRM_DEBUG_KMS("gem object is null.\n"); 94 return -EFAULT; 95 } 96 97 nr_pages = obj->size >> PAGE_SHIFT; 98 99 obj->kvaddr = (void __iomem *) vmap(obj->pages, nr_pages, VM_MAP, 100 pgprot_writecombine(PAGE_KERNEL)); 101 if (!obj->kvaddr) { 102 DRM_ERROR("failed to map pages to kernel space.\n"); 103 return -EIO; 104 } 105 106 /* buffer count to framebuffer always is 1 at booting time. */ 107 exynos_drm_fb_set_buf_cnt(fb, 1); 108 109 offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3); 110 offset += fbi->var.yoffset * fb->pitches[0]; 111 112 fbi->screen_base = obj->kvaddr + offset; 113 fbi->screen_size = size; 114 fbi->fix.smem_len = size; 115 116 return 0; 117 } 118 119 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 120 struct drm_fb_helper_surface_size *sizes) 121 { 122 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper); 123 struct exynos_drm_gem_obj *exynos_gem_obj; 124 struct drm_device *dev = helper->dev; 125 struct fb_info *fbi; 126 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 127 struct platform_device *pdev = dev->platformdev; 128 unsigned long size; 129 int ret; 130 131 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", 132 sizes->surface_width, sizes->surface_height, 133 sizes->surface_bpp); 134 135 mode_cmd.width = sizes->surface_width; 136 mode_cmd.height = sizes->surface_height; 137 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 138 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 139 sizes->surface_depth); 140 141 mutex_lock(&dev->struct_mutex); 142 143 fbi = drm_fb_helper_alloc_fbi(helper); 144 if (IS_ERR(fbi)) { 145 DRM_ERROR("failed to allocate fb info.\n"); 146 ret = PTR_ERR(fbi); 147 goto out; 148 } 149 150 size = mode_cmd.pitches[0] * mode_cmd.height; 151 152 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size); 153 /* 154 * If physically contiguous memory allocation fails and if IOMMU is 155 * supported then try to get buffer from non physically contiguous 156 * memory area. 157 */ 158 if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) { 159 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n"); 160 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG, 161 size); 162 } 163 164 if (IS_ERR(exynos_gem_obj)) { 165 ret = PTR_ERR(exynos_gem_obj); 166 goto err_release_fbi; 167 } 168 169 exynos_fbdev->exynos_gem_obj = exynos_gem_obj; 170 171 helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd, 172 &exynos_gem_obj->base); 173 if (IS_ERR(helper->fb)) { 174 DRM_ERROR("failed to create drm framebuffer.\n"); 175 ret = PTR_ERR(helper->fb); 176 goto err_destroy_gem; 177 } 178 179 fbi->par = helper; 180 fbi->flags = FBINFO_FLAG_DEFAULT; 181 fbi->fbops = &exynos_drm_fb_ops; 182 183 ret = exynos_drm_fbdev_update(helper, sizes, helper->fb); 184 if (ret < 0) 185 goto err_destroy_framebuffer; 186 187 mutex_unlock(&dev->struct_mutex); 188 return ret; 189 190 err_destroy_framebuffer: 191 drm_framebuffer_cleanup(helper->fb); 192 err_destroy_gem: 193 exynos_drm_gem_destroy(exynos_gem_obj); 194 err_release_fbi: 195 drm_fb_helper_release_fbi(helper); 196 197 /* 198 * if failed, all resources allocated above would be released by 199 * drm_mode_config_cleanup() when drm_load() had been called prior 200 * to any specific driver such as fimd or hdmi driver. 201 */ 202 out: 203 mutex_unlock(&dev->struct_mutex); 204 return ret; 205 } 206 207 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 208 .fb_probe = exynos_drm_fbdev_create, 209 }; 210 211 static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev) 212 { 213 struct drm_connector *connector; 214 bool ret = false; 215 216 mutex_lock(&dev->mode_config.mutex); 217 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 218 if (connector->status != connector_status_connected) 219 continue; 220 221 ret = true; 222 break; 223 } 224 mutex_unlock(&dev->mode_config.mutex); 225 226 return ret; 227 } 228 229 int exynos_drm_fbdev_init(struct drm_device *dev) 230 { 231 struct exynos_drm_fbdev *fbdev; 232 struct exynos_drm_private *private = dev->dev_private; 233 struct drm_fb_helper *helper; 234 unsigned int num_crtc; 235 int ret; 236 237 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector) 238 return 0; 239 240 if (!exynos_drm_fbdev_is_anything_connected(dev)) 241 return 0; 242 243 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 244 if (!fbdev) 245 return -ENOMEM; 246 247 private->fb_helper = helper = &fbdev->drm_fb_helper; 248 249 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs); 250 251 num_crtc = dev->mode_config.num_crtc; 252 253 ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR); 254 if (ret < 0) { 255 DRM_ERROR("failed to initialize drm fb helper.\n"); 256 goto err_init; 257 } 258 259 ret = drm_fb_helper_single_add_all_connectors(helper); 260 if (ret < 0) { 261 DRM_ERROR("failed to register drm_fb_helper_connector.\n"); 262 goto err_setup; 263 264 } 265 266 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 267 if (ret < 0) { 268 DRM_ERROR("failed to set up hw configuration.\n"); 269 goto err_setup; 270 } 271 272 return 0; 273 274 err_setup: 275 drm_fb_helper_fini(helper); 276 277 err_init: 278 private->fb_helper = NULL; 279 kfree(fbdev); 280 281 return ret; 282 } 283 284 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 285 struct drm_fb_helper *fb_helper) 286 { 287 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper); 288 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj; 289 struct drm_framebuffer *fb; 290 291 if (exynos_gem_obj->kvaddr) 292 vunmap(exynos_gem_obj->kvaddr); 293 294 /* release drm framebuffer and real buffer */ 295 if (fb_helper->fb && fb_helper->fb->funcs) { 296 fb = fb_helper->fb; 297 if (fb) { 298 drm_framebuffer_unregister_private(fb); 299 drm_framebuffer_remove(fb); 300 } 301 } 302 303 drm_fb_helper_unregister_fbi(fb_helper); 304 drm_fb_helper_release_fbi(fb_helper); 305 306 drm_fb_helper_fini(fb_helper); 307 } 308 309 void exynos_drm_fbdev_fini(struct drm_device *dev) 310 { 311 struct exynos_drm_private *private = dev->dev_private; 312 struct exynos_drm_fbdev *fbdev; 313 314 if (!private || !private->fb_helper) 315 return; 316 317 fbdev = to_exynos_fbdev(private->fb_helper); 318 319 exynos_drm_fbdev_destroy(dev, private->fb_helper); 320 kfree(fbdev); 321 private->fb_helper = NULL; 322 } 323 324 void exynos_drm_fbdev_restore_mode(struct drm_device *dev) 325 { 326 struct exynos_drm_private *private = dev->dev_private; 327 328 if (!private || !private->fb_helper) 329 return; 330 331 drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper); 332 } 333