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 <linux/console.h> 22 23 #include "exynos_drm_drv.h" 24 #include "exynos_drm_fb.h" 25 #include "exynos_drm_fbdev.h" 26 #include "exynos_drm_iommu.h" 27 28 #define MAX_CONNECTOR 4 29 #define PREFERRED_BPP 32 30 31 #define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\ 32 drm_fb_helper) 33 34 struct exynos_drm_fbdev { 35 struct drm_fb_helper drm_fb_helper; 36 struct exynos_drm_gem *exynos_gem; 37 }; 38 39 static int exynos_drm_fb_mmap(struct fb_info *info, 40 struct vm_area_struct *vma) 41 { 42 struct drm_fb_helper *helper = info->par; 43 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper); 44 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem; 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 > exynos_gem->size) 53 return -EINVAL; 54 55 ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie, 56 exynos_gem->dma_addr, exynos_gem->size, 57 exynos_gem->dma_attrs); 58 if (ret < 0) { 59 DRM_ERROR("failed to mmap.\n"); 60 return ret; 61 } 62 63 return 0; 64 } 65 66 static struct fb_ops exynos_drm_fb_ops = { 67 .owner = THIS_MODULE, 68 DRM_FB_HELPER_DEFAULT_OPS, 69 .fb_mmap = exynos_drm_fb_mmap, 70 .fb_fillrect = drm_fb_helper_cfb_fillrect, 71 .fb_copyarea = drm_fb_helper_cfb_copyarea, 72 .fb_imageblit = drm_fb_helper_cfb_imageblit, 73 }; 74 75 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper, 76 struct drm_fb_helper_surface_size *sizes, 77 struct exynos_drm_gem *exynos_gem) 78 { 79 struct fb_info *fbi; 80 struct drm_framebuffer *fb = helper->fb; 81 unsigned int size = fb->width * fb->height * fb->format->cpp[0]; 82 unsigned int nr_pages; 83 unsigned long offset; 84 85 fbi = drm_fb_helper_alloc_fbi(helper); 86 if (IS_ERR(fbi)) { 87 DRM_ERROR("failed to allocate fb info.\n"); 88 return PTR_ERR(fbi); 89 } 90 91 fbi->par = helper; 92 fbi->flags = FBINFO_FLAG_DEFAULT; 93 fbi->fbops = &exynos_drm_fb_ops; 94 95 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth); 96 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); 97 98 nr_pages = exynos_gem->size >> PAGE_SHIFT; 99 100 exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages, 101 VM_MAP, pgprot_writecombine(PAGE_KERNEL)); 102 if (!exynos_gem->kvaddr) { 103 DRM_ERROR("failed to map pages to kernel space.\n"); 104 return -EIO; 105 } 106 107 offset = fbi->var.xoffset * fb->format->cpp[0]; 108 offset += fbi->var.yoffset * fb->pitches[0]; 109 110 fbi->screen_base = exynos_gem->kvaddr + offset; 111 fbi->screen_size = size; 112 fbi->fix.smem_len = size; 113 114 return 0; 115 } 116 117 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 118 struct drm_fb_helper_surface_size *sizes) 119 { 120 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper); 121 struct exynos_drm_gem *exynos_gem; 122 struct drm_device *dev = helper->dev; 123 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 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(dev->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 int exynos_drm_fbdev_init(struct drm_device *dev) 189 { 190 struct exynos_drm_fbdev *fbdev; 191 struct exynos_drm_private *private = dev->dev_private; 192 struct drm_fb_helper *helper; 193 int ret; 194 195 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector) 196 return 0; 197 198 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 199 if (!fbdev) 200 return -ENOMEM; 201 202 private->fb_helper = helper = &fbdev->drm_fb_helper; 203 204 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs); 205 206 ret = drm_fb_helper_init(dev, helper, MAX_CONNECTOR); 207 if (ret < 0) { 208 DRM_ERROR("failed to initialize drm fb helper.\n"); 209 goto err_init; 210 } 211 212 ret = drm_fb_helper_single_add_all_connectors(helper); 213 if (ret < 0) { 214 DRM_ERROR("failed to register drm_fb_helper_connector.\n"); 215 goto err_setup; 216 217 } 218 219 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 220 if (ret < 0) { 221 DRM_ERROR("failed to set up hw configuration.\n"); 222 goto err_setup; 223 } 224 225 return 0; 226 227 err_setup: 228 drm_fb_helper_fini(helper); 229 230 err_init: 231 private->fb_helper = NULL; 232 kfree(fbdev); 233 234 return ret; 235 } 236 237 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 238 struct drm_fb_helper *fb_helper) 239 { 240 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper); 241 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem; 242 struct drm_framebuffer *fb; 243 244 vunmap(exynos_gem->kvaddr); 245 246 /* release drm framebuffer and real buffer */ 247 if (fb_helper->fb && fb_helper->fb->funcs) { 248 fb = fb_helper->fb; 249 if (fb) 250 drm_framebuffer_remove(fb); 251 } 252 253 drm_fb_helper_unregister_fbi(fb_helper); 254 255 drm_fb_helper_fini(fb_helper); 256 } 257 258 void exynos_drm_fbdev_fini(struct drm_device *dev) 259 { 260 struct exynos_drm_private *private = dev->dev_private; 261 struct exynos_drm_fbdev *fbdev; 262 263 if (!private || !private->fb_helper) 264 return; 265 266 fbdev = to_exynos_fbdev(private->fb_helper); 267 268 exynos_drm_fbdev_destroy(dev, private->fb_helper); 269 kfree(fbdev); 270 private->fb_helper = NULL; 271 } 272 273 void exynos_drm_fbdev_restore_mode(struct drm_device *dev) 274 { 275 struct exynos_drm_private *private = dev->dev_private; 276 277 if (!private || !private->fb_helper) 278 return; 279 280 drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper); 281 } 282 283 void exynos_drm_output_poll_changed(struct drm_device *dev) 284 { 285 struct exynos_drm_private *private = dev->dev_private; 286 struct drm_fb_helper *fb_helper = private->fb_helper; 287 288 drm_fb_helper_hotplug_event(fb_helper); 289 } 290 291 void exynos_drm_fbdev_suspend(struct drm_device *dev) 292 { 293 struct exynos_drm_private *private = dev->dev_private; 294 295 console_lock(); 296 drm_fb_helper_set_suspend(private->fb_helper, 1); 297 console_unlock(); 298 } 299 300 void exynos_drm_fbdev_resume(struct drm_device *dev) 301 { 302 struct exynos_drm_private *private = dev->dev_private; 303 304 console_lock(); 305 drm_fb_helper_set_suspend(private->fb_helper, 0); 306 console_unlock(); 307 } 308