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