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 20 #include "exynos_drm_drv.h" 21 #include "exynos_drm_fb.h" 22 #include "exynos_drm_gem.h" 23 #include "exynos_drm_iommu.h" 24 25 #define MAX_CONNECTOR 4 26 #define PREFERRED_BPP 32 27 28 #define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\ 29 drm_fb_helper) 30 31 struct exynos_drm_fbdev { 32 struct drm_fb_helper drm_fb_helper; 33 struct exynos_drm_gem_obj *exynos_gem_obj; 34 }; 35 36 static int exynos_drm_fb_mmap(struct fb_info *info, 37 struct vm_area_struct *vma) 38 { 39 struct drm_fb_helper *helper = info->par; 40 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper); 41 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj; 42 struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer; 43 unsigned long vm_size; 44 int ret; 45 46 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 47 48 vm_size = vma->vm_end - vma->vm_start; 49 50 if (vm_size > buffer->size) 51 return -EINVAL; 52 53 ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages, 54 buffer->dma_addr, buffer->size, &buffer->dma_attrs); 55 if (ret < 0) { 56 DRM_ERROR("failed to mmap.\n"); 57 return ret; 58 } 59 60 return 0; 61 } 62 63 static struct fb_ops exynos_drm_fb_ops = { 64 .owner = THIS_MODULE, 65 .fb_mmap = exynos_drm_fb_mmap, 66 .fb_fillrect = cfb_fillrect, 67 .fb_copyarea = cfb_copyarea, 68 .fb_imageblit = cfb_imageblit, 69 .fb_check_var = drm_fb_helper_check_var, 70 .fb_set_par = drm_fb_helper_set_par, 71 .fb_blank = drm_fb_helper_blank, 72 .fb_pan_display = drm_fb_helper_pan_display, 73 .fb_setcmap = drm_fb_helper_setcmap, 74 }; 75 76 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper, 77 struct drm_framebuffer *fb) 78 { 79 struct fb_info *fbi = helper->fbdev; 80 struct drm_device *dev = helper->dev; 81 struct exynos_drm_gem_buf *buffer; 82 unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3); 83 unsigned long offset; 84 85 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); 86 drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height); 87 88 /* RGB formats use only one buffer */ 89 buffer = exynos_drm_fb_buffer(fb, 0); 90 if (!buffer) { 91 DRM_LOG_KMS("buffer is null.\n"); 92 return -EFAULT; 93 } 94 95 /* map pages with kernel virtual space. */ 96 if (!buffer->kvaddr) { 97 if (is_drm_iommu_supported(dev)) { 98 unsigned int nr_pages = buffer->size >> PAGE_SHIFT; 99 100 buffer->kvaddr = vmap(buffer->pages, nr_pages, VM_MAP, 101 pgprot_writecombine(PAGE_KERNEL)); 102 } else { 103 phys_addr_t dma_addr = buffer->dma_addr; 104 if (dma_addr) 105 buffer->kvaddr = phys_to_virt(dma_addr); 106 else 107 buffer->kvaddr = (void __iomem *)NULL; 108 } 109 if (!buffer->kvaddr) { 110 DRM_ERROR("failed to map pages to kernel space.\n"); 111 return -EIO; 112 } 113 } 114 115 /* buffer count to framebuffer always is 1 at booting time. */ 116 exynos_drm_fb_set_buf_cnt(fb, 1); 117 118 offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3); 119 offset += fbi->var.yoffset * fb->pitches[0]; 120 121 dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr; 122 fbi->screen_base = buffer->kvaddr + offset; 123 if (is_drm_iommu_supported(dev)) 124 fbi->fix.smem_start = (unsigned long) 125 (page_to_phys(sg_page(buffer->sgt->sgl)) + offset); 126 else 127 fbi->fix.smem_start = (unsigned long)buffer->dma_addr; 128 129 fbi->screen_size = size; 130 fbi->fix.smem_len = size; 131 132 return 0; 133 } 134 135 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 136 struct drm_fb_helper_surface_size *sizes) 137 { 138 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper); 139 struct exynos_drm_gem_obj *exynos_gem_obj; 140 struct drm_device *dev = helper->dev; 141 struct fb_info *fbi; 142 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 143 struct platform_device *pdev = dev->platformdev; 144 unsigned long size; 145 int ret; 146 147 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", 148 sizes->surface_width, sizes->surface_height, 149 sizes->surface_bpp); 150 151 mode_cmd.width = sizes->surface_width; 152 mode_cmd.height = sizes->surface_height; 153 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 154 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 155 sizes->surface_depth); 156 157 mutex_lock(&dev->struct_mutex); 158 159 fbi = framebuffer_alloc(0, &pdev->dev); 160 if (!fbi) { 161 DRM_ERROR("failed to allocate fb info.\n"); 162 ret = -ENOMEM; 163 goto out; 164 } 165 166 size = mode_cmd.pitches[0] * mode_cmd.height; 167 168 /* 0 means to allocate physically continuous memory */ 169 exynos_gem_obj = exynos_drm_gem_create(dev, 0, size); 170 if (IS_ERR(exynos_gem_obj)) { 171 ret = PTR_ERR(exynos_gem_obj); 172 goto err_release_framebuffer; 173 } 174 175 exynos_fbdev->exynos_gem_obj = exynos_gem_obj; 176 177 helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd, 178 &exynos_gem_obj->base); 179 if (IS_ERR(helper->fb)) { 180 DRM_ERROR("failed to create drm framebuffer.\n"); 181 ret = PTR_ERR(helper->fb); 182 goto err_destroy_gem; 183 } 184 185 helper->fbdev = fbi; 186 187 fbi->par = helper; 188 fbi->flags = FBINFO_FLAG_DEFAULT; 189 fbi->fbops = &exynos_drm_fb_ops; 190 191 ret = fb_alloc_cmap(&fbi->cmap, 256, 0); 192 if (ret) { 193 DRM_ERROR("failed to allocate cmap.\n"); 194 goto err_destroy_framebuffer; 195 } 196 197 ret = exynos_drm_fbdev_update(helper, helper->fb); 198 if (ret < 0) 199 goto err_dealloc_cmap; 200 201 mutex_unlock(&dev->struct_mutex); 202 return ret; 203 204 err_dealloc_cmap: 205 fb_dealloc_cmap(&fbi->cmap); 206 err_destroy_framebuffer: 207 drm_framebuffer_cleanup(helper->fb); 208 err_destroy_gem: 209 exynos_drm_gem_destroy(exynos_gem_obj); 210 err_release_framebuffer: 211 framebuffer_release(fbi); 212 213 /* 214 * if failed, all resources allocated above would be released by 215 * drm_mode_config_cleanup() when drm_load() had been called prior 216 * to any specific driver such as fimd or hdmi driver. 217 */ 218 out: 219 mutex_unlock(&dev->struct_mutex); 220 return ret; 221 } 222 223 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 224 .fb_probe = exynos_drm_fbdev_create, 225 }; 226 227 int exynos_drm_fbdev_init(struct drm_device *dev) 228 { 229 struct exynos_drm_fbdev *fbdev; 230 struct exynos_drm_private *private = dev->dev_private; 231 struct drm_fb_helper *helper; 232 unsigned int num_crtc; 233 int ret; 234 235 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector) 236 return 0; 237 238 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 239 if (!fbdev) { 240 DRM_ERROR("failed to allocate drm fbdev.\n"); 241 return -ENOMEM; 242 } 243 244 private->fb_helper = helper = &fbdev->drm_fb_helper; 245 helper->funcs = &exynos_drm_fb_helper_funcs; 246 247 num_crtc = dev->mode_config.num_crtc; 248 249 ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR); 250 if (ret < 0) { 251 DRM_ERROR("failed to initialize drm fb helper.\n"); 252 goto err_init; 253 } 254 255 ret = drm_fb_helper_single_add_all_connectors(helper); 256 if (ret < 0) { 257 DRM_ERROR("failed to register drm_fb_helper_connector.\n"); 258 goto err_setup; 259 260 } 261 262 /* disable all the possible outputs/crtcs before entering KMS mode */ 263 drm_helper_disable_unused_functions(dev); 264 265 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 266 if (ret < 0) { 267 DRM_ERROR("failed to set up hw configuration.\n"); 268 goto err_setup; 269 } 270 271 return 0; 272 273 err_setup: 274 drm_fb_helper_fini(helper); 275 276 err_init: 277 private->fb_helper = NULL; 278 kfree(fbdev); 279 280 return ret; 281 } 282 283 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 284 struct drm_fb_helper *fb_helper) 285 { 286 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper); 287 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj; 288 struct drm_framebuffer *fb; 289 290 if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr) 291 vunmap(exynos_gem_obj->buffer->kvaddr); 292 293 /* release drm framebuffer and real buffer */ 294 if (fb_helper->fb && fb_helper->fb->funcs) { 295 fb = fb_helper->fb; 296 if (fb) { 297 drm_framebuffer_unregister_private(fb); 298 drm_framebuffer_remove(fb); 299 } 300 } 301 302 /* release linux framebuffer */ 303 if (fb_helper->fbdev) { 304 struct fb_info *info; 305 int ret; 306 307 info = fb_helper->fbdev; 308 ret = unregister_framebuffer(info); 309 if (ret < 0) 310 DRM_DEBUG_KMS("failed unregister_framebuffer()\n"); 311 312 if (info->cmap.len) 313 fb_dealloc_cmap(&info->cmap); 314 315 framebuffer_release(info); 316 } 317 318 drm_fb_helper_fini(fb_helper); 319 } 320 321 void exynos_drm_fbdev_fini(struct drm_device *dev) 322 { 323 struct exynos_drm_private *private = dev->dev_private; 324 struct exynos_drm_fbdev *fbdev; 325 326 if (!private || !private->fb_helper) 327 return; 328 329 fbdev = to_exynos_fbdev(private->fb_helper); 330 331 if (fbdev->exynos_gem_obj) 332 exynos_drm_gem_destroy(fbdev->exynos_gem_obj); 333 334 exynos_drm_fbdev_destroy(dev, private->fb_helper); 335 kfree(fbdev); 336 private->fb_helper = NULL; 337 } 338 339 void exynos_drm_fbdev_restore_mode(struct drm_device *dev) 340 { 341 struct exynos_drm_private *private = dev->dev_private; 342 343 if (!private || !private->fb_helper) 344 return; 345 346 drm_modeset_lock_all(dev); 347 drm_fb_helper_restore_fbdev_mode(private->fb_helper); 348 drm_modeset_unlock_all(dev); 349 } 350