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_obj *obj; 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_obj *obj = exynos_fbd->obj; 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 > obj->size) 51 return -EINVAL; 52 53 ret = dma_mmap_attrs(helper->dev->dev, vma, obj->pages, obj->dma_addr, 54 obj->size, &obj->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 = drm_fb_helper_cfb_fillrect, 67 .fb_copyarea = drm_fb_helper_cfb_copyarea, 68 .fb_imageblit = drm_fb_helper_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_fb_helper_surface_size *sizes, 78 struct exynos_drm_gem_obj *obj) 79 { 80 struct fb_info *fbi; 81 struct drm_framebuffer *fb = helper->fb; 82 unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3); 83 unsigned int nr_pages; 84 unsigned long offset; 85 86 fbi = drm_fb_helper_alloc_fbi(helper); 87 if (IS_ERR(fbi)) { 88 DRM_ERROR("failed to allocate fb info.\n"); 89 return PTR_ERR(fbi); 90 } 91 92 fbi->par = helper; 93 fbi->flags = FBINFO_FLAG_DEFAULT; 94 fbi->fbops = &exynos_drm_fb_ops; 95 96 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); 97 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); 98 99 nr_pages = obj->size >> PAGE_SHIFT; 100 101 obj->kvaddr = (void __iomem *) vmap(obj->pages, nr_pages, VM_MAP, 102 pgprot_writecombine(PAGE_KERNEL)); 103 if (!obj->kvaddr) { 104 DRM_ERROR("failed to map pages to kernel space.\n"); 105 drm_fb_helper_release_fbi(helper); 106 return -EIO; 107 } 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 *obj; 124 struct drm_device *dev = helper->dev; 125 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 126 struct platform_device *pdev = dev->platformdev; 127 unsigned long size; 128 int ret; 129 130 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", 131 sizes->surface_width, sizes->surface_height, 132 sizes->surface_bpp); 133 134 mode_cmd.width = sizes->surface_width; 135 mode_cmd.height = sizes->surface_height; 136 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 137 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 138 sizes->surface_depth); 139 140 mutex_lock(&dev->struct_mutex); 141 142 size = mode_cmd.pitches[0] * mode_cmd.height; 143 144 obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size); 145 /* 146 * If physically contiguous memory allocation fails and if IOMMU is 147 * supported then try to get buffer from non physically contiguous 148 * memory area. 149 */ 150 if (IS_ERR(obj) && is_drm_iommu_supported(dev)) { 151 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n"); 152 obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG, size); 153 } 154 155 if (IS_ERR(obj)) { 156 ret = PTR_ERR(obj); 157 goto out; 158 } 159 160 exynos_fbdev->obj = obj; 161 162 helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd, &obj, 1); 163 if (IS_ERR(helper->fb)) { 164 DRM_ERROR("failed to create drm framebuffer.\n"); 165 ret = PTR_ERR(helper->fb); 166 goto err_destroy_gem; 167 } 168 169 ret = exynos_drm_fbdev_update(helper, sizes, obj); 170 if (ret < 0) 171 goto err_destroy_framebuffer; 172 173 mutex_unlock(&dev->struct_mutex); 174 return ret; 175 176 err_destroy_framebuffer: 177 drm_framebuffer_cleanup(helper->fb); 178 err_destroy_gem: 179 exynos_drm_gem_destroy(obj); 180 181 /* 182 * if failed, all resources allocated above would be released by 183 * drm_mode_config_cleanup() when drm_load() had been called prior 184 * to any specific driver such as fimd or hdmi driver. 185 */ 186 out: 187 mutex_unlock(&dev->struct_mutex); 188 return ret; 189 } 190 191 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 192 .fb_probe = exynos_drm_fbdev_create, 193 }; 194 195 static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev) 196 { 197 struct drm_connector *connector; 198 bool ret = false; 199 200 mutex_lock(&dev->mode_config.mutex); 201 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 202 if (connector->status != connector_status_connected) 203 continue; 204 205 ret = true; 206 break; 207 } 208 mutex_unlock(&dev->mode_config.mutex); 209 210 return ret; 211 } 212 213 int exynos_drm_fbdev_init(struct drm_device *dev) 214 { 215 struct exynos_drm_fbdev *fbdev; 216 struct exynos_drm_private *private = dev->dev_private; 217 struct drm_fb_helper *helper; 218 unsigned int num_crtc; 219 int ret; 220 221 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector) 222 return 0; 223 224 if (!exynos_drm_fbdev_is_anything_connected(dev)) 225 return 0; 226 227 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 228 if (!fbdev) 229 return -ENOMEM; 230 231 private->fb_helper = helper = &fbdev->drm_fb_helper; 232 233 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs); 234 235 num_crtc = dev->mode_config.num_crtc; 236 237 ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR); 238 if (ret < 0) { 239 DRM_ERROR("failed to initialize drm fb helper.\n"); 240 goto err_init; 241 } 242 243 ret = drm_fb_helper_single_add_all_connectors(helper); 244 if (ret < 0) { 245 DRM_ERROR("failed to register drm_fb_helper_connector.\n"); 246 goto err_setup; 247 248 } 249 250 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 251 if (ret < 0) { 252 DRM_ERROR("failed to set up hw configuration.\n"); 253 goto err_setup; 254 } 255 256 return 0; 257 258 err_setup: 259 drm_fb_helper_fini(helper); 260 261 err_init: 262 private->fb_helper = NULL; 263 kfree(fbdev); 264 265 return ret; 266 } 267 268 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 269 struct drm_fb_helper *fb_helper) 270 { 271 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper); 272 struct exynos_drm_gem_obj *obj = exynos_fbd->obj; 273 struct drm_framebuffer *fb; 274 275 if (obj->kvaddr) 276 vunmap(obj->kvaddr); 277 278 /* release drm framebuffer and real buffer */ 279 if (fb_helper->fb && fb_helper->fb->funcs) { 280 fb = fb_helper->fb; 281 if (fb) { 282 drm_framebuffer_unregister_private(fb); 283 drm_framebuffer_remove(fb); 284 } 285 } 286 287 drm_fb_helper_unregister_fbi(fb_helper); 288 drm_fb_helper_release_fbi(fb_helper); 289 290 drm_fb_helper_fini(fb_helper); 291 } 292 293 void exynos_drm_fbdev_fini(struct drm_device *dev) 294 { 295 struct exynos_drm_private *private = dev->dev_private; 296 struct exynos_drm_fbdev *fbdev; 297 298 if (!private || !private->fb_helper) 299 return; 300 301 fbdev = to_exynos_fbdev(private->fb_helper); 302 303 exynos_drm_fbdev_destroy(dev, private->fb_helper); 304 kfree(fbdev); 305 private->fb_helper = NULL; 306 } 307 308 void exynos_drm_fbdev_restore_mode(struct drm_device *dev) 309 { 310 struct exynos_drm_private *private = dev->dev_private; 311 312 if (!private || !private->fb_helper) 313 return; 314 315 drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper); 316 } 317