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_iommu.h" 25 26 #define MAX_CONNECTOR 4 27 #define PREFERRED_BPP 32 28 29 #define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\ 30 drm_fb_helper) 31 32 struct exynos_drm_fbdev { 33 struct drm_fb_helper drm_fb_helper; 34 struct exynos_drm_gem *exynos_gem; 35 }; 36 37 static int exynos_drm_fb_mmap(struct fb_info *info, 38 struct vm_area_struct *vma) 39 { 40 struct drm_fb_helper *helper = info->par; 41 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper); 42 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem; 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 > exynos_gem->size) 51 return -EINVAL; 52 53 ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie, 54 exynos_gem->dma_addr, exynos_gem->size, 55 exynos_gem->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 DRM_FB_HELPER_DEFAULT_OPS, 67 .fb_mmap = exynos_drm_fb_mmap, 68 .fb_fillrect = drm_fb_helper_cfb_fillrect, 69 .fb_copyarea = drm_fb_helper_cfb_copyarea, 70 .fb_imageblit = drm_fb_helper_cfb_imageblit, 71 }; 72 73 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper, 74 struct drm_fb_helper_surface_size *sizes, 75 struct exynos_drm_gem *exynos_gem) 76 { 77 struct fb_info *fbi; 78 struct drm_framebuffer *fb = helper->fb; 79 unsigned int size = fb->width * fb->height * fb->format->cpp[0]; 80 unsigned int nr_pages; 81 unsigned long offset; 82 83 fbi = drm_fb_helper_alloc_fbi(helper); 84 if (IS_ERR(fbi)) { 85 DRM_ERROR("failed to allocate fb info.\n"); 86 return PTR_ERR(fbi); 87 } 88 89 fbi->par = helper; 90 fbi->flags = FBINFO_FLAG_DEFAULT; 91 fbi->fbops = &exynos_drm_fb_ops; 92 93 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth); 94 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); 95 96 nr_pages = exynos_gem->size >> PAGE_SHIFT; 97 98 exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages, 99 VM_MAP, pgprot_writecombine(PAGE_KERNEL)); 100 if (!exynos_gem->kvaddr) { 101 DRM_ERROR("failed to map pages to kernel space.\n"); 102 drm_fb_helper_release_fbi(helper); 103 return -EIO; 104 } 105 106 offset = fbi->var.xoffset * fb->format->cpp[0]; 107 offset += fbi->var.yoffset * fb->pitches[0]; 108 109 fbi->screen_base = exynos_gem->kvaddr + offset; 110 fbi->screen_size = size; 111 fbi->fix.smem_len = size; 112 113 return 0; 114 } 115 116 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 117 struct drm_fb_helper_surface_size *sizes) 118 { 119 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper); 120 struct exynos_drm_gem *exynos_gem; 121 struct drm_device *dev = helper->dev; 122 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 123 struct platform_device *pdev = dev->platformdev; 124 unsigned long size; 125 int ret; 126 127 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", 128 sizes->surface_width, sizes->surface_height, 129 sizes->surface_bpp); 130 131 mode_cmd.width = sizes->surface_width; 132 mode_cmd.height = sizes->surface_height; 133 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 134 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 135 sizes->surface_depth); 136 137 size = mode_cmd.pitches[0] * mode_cmd.height; 138 139 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size); 140 /* 141 * If physically contiguous memory allocation fails and if IOMMU is 142 * supported then try to get buffer from non physically contiguous 143 * memory area. 144 */ 145 if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) { 146 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n"); 147 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG, 148 size); 149 } 150 151 if (IS_ERR(exynos_gem)) 152 return PTR_ERR(exynos_gem); 153 154 exynos_fbdev->exynos_gem = exynos_gem; 155 156 helper->fb = 157 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1); 158 if (IS_ERR(helper->fb)) { 159 DRM_ERROR("failed to create drm framebuffer.\n"); 160 ret = PTR_ERR(helper->fb); 161 goto err_destroy_gem; 162 } 163 164 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem); 165 if (ret < 0) 166 goto err_destroy_framebuffer; 167 168 return ret; 169 170 err_destroy_framebuffer: 171 drm_framebuffer_cleanup(helper->fb); 172 err_destroy_gem: 173 exynos_drm_gem_destroy(exynos_gem); 174 175 /* 176 * if failed, all resources allocated above would be released by 177 * drm_mode_config_cleanup() when drm_load() had been called prior 178 * to any specific driver such as fimd or hdmi driver. 179 */ 180 181 return ret; 182 } 183 184 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 185 .fb_probe = exynos_drm_fbdev_create, 186 }; 187 188 static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev) 189 { 190 struct drm_connector *connector; 191 bool ret = false; 192 193 mutex_lock(&dev->mode_config.mutex); 194 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 195 if (connector->status != connector_status_connected) 196 continue; 197 198 ret = true; 199 break; 200 } 201 mutex_unlock(&dev->mode_config.mutex); 202 203 return ret; 204 } 205 206 int exynos_drm_fbdev_init(struct drm_device *dev) 207 { 208 struct exynos_drm_fbdev *fbdev; 209 struct exynos_drm_private *private = dev->dev_private; 210 struct drm_fb_helper *helper; 211 int ret; 212 213 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector) 214 return 0; 215 216 if (!exynos_drm_fbdev_is_anything_connected(dev)) 217 return 0; 218 219 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 220 if (!fbdev) 221 return -ENOMEM; 222 223 private->fb_helper = helper = &fbdev->drm_fb_helper; 224 225 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs); 226 227 ret = drm_fb_helper_init(dev, helper, MAX_CONNECTOR); 228 if (ret < 0) { 229 DRM_ERROR("failed to initialize drm fb helper.\n"); 230 goto err_init; 231 } 232 233 ret = drm_fb_helper_single_add_all_connectors(helper); 234 if (ret < 0) { 235 DRM_ERROR("failed to register drm_fb_helper_connector.\n"); 236 goto err_setup; 237 238 } 239 240 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 241 if (ret < 0) { 242 DRM_ERROR("failed to set up hw configuration.\n"); 243 goto err_setup; 244 } 245 246 return 0; 247 248 err_setup: 249 drm_fb_helper_fini(helper); 250 251 err_init: 252 private->fb_helper = NULL; 253 kfree(fbdev); 254 255 return ret; 256 } 257 258 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 259 struct drm_fb_helper *fb_helper) 260 { 261 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper); 262 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem; 263 struct drm_framebuffer *fb; 264 265 vunmap(exynos_gem->kvaddr); 266 267 /* release drm framebuffer and real buffer */ 268 if (fb_helper->fb && fb_helper->fb->funcs) { 269 fb = fb_helper->fb; 270 if (fb) 271 drm_framebuffer_remove(fb); 272 } 273 274 drm_fb_helper_unregister_fbi(fb_helper); 275 drm_fb_helper_release_fbi(fb_helper); 276 277 drm_fb_helper_fini(fb_helper); 278 } 279 280 void exynos_drm_fbdev_fini(struct drm_device *dev) 281 { 282 struct exynos_drm_private *private = dev->dev_private; 283 struct exynos_drm_fbdev *fbdev; 284 285 if (!private || !private->fb_helper) 286 return; 287 288 fbdev = to_exynos_fbdev(private->fb_helper); 289 290 exynos_drm_fbdev_destroy(dev, private->fb_helper); 291 kfree(fbdev); 292 private->fb_helper = NULL; 293 } 294 295 void exynos_drm_fbdev_restore_mode(struct drm_device *dev) 296 { 297 struct exynos_drm_private *private = dev->dev_private; 298 299 if (!private || !private->fb_helper) 300 return; 301 302 drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper); 303 } 304 305 void exynos_drm_output_poll_changed(struct drm_device *dev) 306 { 307 struct exynos_drm_private *private = dev->dev_private; 308 struct drm_fb_helper *fb_helper = private->fb_helper; 309 310 if (fb_helper) 311 drm_fb_helper_hotplug_event(fb_helper); 312 else 313 exynos_drm_fbdev_init(dev); 314 } 315