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_LOG_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 dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr; 125 fbi->screen_base = buffer->kvaddr + offset; 126 if (is_drm_iommu_supported(dev)) 127 fbi->fix.smem_start = (unsigned long) 128 (page_to_phys(sg_page(buffer->sgt->sgl)) + offset); 129 else 130 fbi->fix.smem_start = (unsigned long)buffer->dma_addr; 131 132 fbi->screen_size = size; 133 fbi->fix.smem_len = size; 134 135 return 0; 136 } 137 138 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 139 struct drm_fb_helper_surface_size *sizes) 140 { 141 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper); 142 struct exynos_drm_gem_obj *exynos_gem_obj; 143 struct drm_device *dev = helper->dev; 144 struct fb_info *fbi; 145 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 146 struct platform_device *pdev = dev->platformdev; 147 unsigned long size; 148 int ret; 149 150 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", 151 sizes->surface_width, sizes->surface_height, 152 sizes->surface_bpp); 153 154 mode_cmd.width = sizes->surface_width; 155 mode_cmd.height = sizes->surface_height; 156 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 157 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 158 sizes->surface_depth); 159 160 mutex_lock(&dev->struct_mutex); 161 162 fbi = framebuffer_alloc(0, &pdev->dev); 163 if (!fbi) { 164 DRM_ERROR("failed to allocate fb info.\n"); 165 ret = -ENOMEM; 166 goto out; 167 } 168 169 size = mode_cmd.pitches[0] * mode_cmd.height; 170 171 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size); 172 /* 173 * If physically contiguous memory allocation fails and if IOMMU is 174 * supported then try to get buffer from non physically contiguous 175 * memory area. 176 */ 177 if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) { 178 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n"); 179 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG, 180 size); 181 } 182 183 if (IS_ERR(exynos_gem_obj)) { 184 ret = PTR_ERR(exynos_gem_obj); 185 goto err_release_framebuffer; 186 } 187 188 exynos_fbdev->exynos_gem_obj = exynos_gem_obj; 189 190 helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd, 191 &exynos_gem_obj->base); 192 if (IS_ERR(helper->fb)) { 193 DRM_ERROR("failed to create drm framebuffer.\n"); 194 ret = PTR_ERR(helper->fb); 195 goto err_destroy_gem; 196 } 197 198 helper->fbdev = fbi; 199 200 fbi->par = helper; 201 fbi->flags = FBINFO_FLAG_DEFAULT; 202 fbi->fbops = &exynos_drm_fb_ops; 203 204 ret = fb_alloc_cmap(&fbi->cmap, 256, 0); 205 if (ret) { 206 DRM_ERROR("failed to allocate cmap.\n"); 207 goto err_destroy_framebuffer; 208 } 209 210 ret = exynos_drm_fbdev_update(helper, helper->fb); 211 if (ret < 0) 212 goto err_dealloc_cmap; 213 214 mutex_unlock(&dev->struct_mutex); 215 return ret; 216 217 err_dealloc_cmap: 218 fb_dealloc_cmap(&fbi->cmap); 219 err_destroy_framebuffer: 220 drm_framebuffer_cleanup(helper->fb); 221 err_destroy_gem: 222 exynos_drm_gem_destroy(exynos_gem_obj); 223 err_release_framebuffer: 224 framebuffer_release(fbi); 225 226 /* 227 * if failed, all resources allocated above would be released by 228 * drm_mode_config_cleanup() when drm_load() had been called prior 229 * to any specific driver such as fimd or hdmi driver. 230 */ 231 out: 232 mutex_unlock(&dev->struct_mutex); 233 return ret; 234 } 235 236 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 237 .fb_probe = exynos_drm_fbdev_create, 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 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 252 if (!fbdev) 253 return -ENOMEM; 254 255 private->fb_helper = helper = &fbdev->drm_fb_helper; 256 helper->funcs = &exynos_drm_fb_helper_funcs; 257 258 num_crtc = dev->mode_config.num_crtc; 259 260 ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR); 261 if (ret < 0) { 262 DRM_ERROR("failed to initialize drm fb helper.\n"); 263 goto err_init; 264 } 265 266 ret = drm_fb_helper_single_add_all_connectors(helper); 267 if (ret < 0) { 268 DRM_ERROR("failed to register drm_fb_helper_connector.\n"); 269 goto err_setup; 270 271 } 272 273 /* disable all the possible outputs/crtcs before entering KMS mode */ 274 drm_helper_disable_unused_functions(dev); 275 276 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 277 if (ret < 0) { 278 DRM_ERROR("failed to set up hw configuration.\n"); 279 goto err_setup; 280 } 281 282 return 0; 283 284 err_setup: 285 drm_fb_helper_fini(helper); 286 287 err_init: 288 private->fb_helper = NULL; 289 kfree(fbdev); 290 291 return ret; 292 } 293 294 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 295 struct drm_fb_helper *fb_helper) 296 { 297 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper); 298 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj; 299 struct drm_framebuffer *fb; 300 301 if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr) 302 vunmap(exynos_gem_obj->buffer->kvaddr); 303 304 /* release drm framebuffer and real buffer */ 305 if (fb_helper->fb && fb_helper->fb->funcs) { 306 fb = fb_helper->fb; 307 if (fb) { 308 drm_framebuffer_unregister_private(fb); 309 drm_framebuffer_remove(fb); 310 } 311 } 312 313 /* release linux framebuffer */ 314 if (fb_helper->fbdev) { 315 struct fb_info *info; 316 int ret; 317 318 info = fb_helper->fbdev; 319 ret = unregister_framebuffer(info); 320 if (ret < 0) 321 DRM_DEBUG_KMS("failed unregister_framebuffer()\n"); 322 323 if (info->cmap.len) 324 fb_dealloc_cmap(&info->cmap); 325 326 framebuffer_release(info); 327 } 328 329 drm_fb_helper_fini(fb_helper); 330 } 331 332 void exynos_drm_fbdev_fini(struct drm_device *dev) 333 { 334 struct exynos_drm_private *private = dev->dev_private; 335 struct exynos_drm_fbdev *fbdev; 336 337 if (!private || !private->fb_helper) 338 return; 339 340 fbdev = to_exynos_fbdev(private->fb_helper); 341 342 if (fbdev->exynos_gem_obj) 343 exynos_drm_gem_destroy(fbdev->exynos_gem_obj); 344 345 exynos_drm_fbdev_destroy(dev, private->fb_helper); 346 kfree(fbdev); 347 private->fb_helper = NULL; 348 } 349 350 void exynos_drm_fbdev_restore_mode(struct drm_device *dev) 351 { 352 struct exynos_drm_private *private = dev->dev_private; 353 354 if (!private || !private->fb_helper) 355 return; 356 357 drm_modeset_lock_all(dev); 358 drm_fb_helper_restore_fbdev_mode(private->fb_helper); 359 drm_modeset_unlock_all(dev); 360 } 361