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_probe_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 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 *exynos_gem; 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 *exynos_gem = exynos_fbd->exynos_gem; 44 unsigned long vm_size; 45 int ret; 46 47 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 48 49 vm_size = vma->vm_end - vma->vm_start; 50 51 if (vm_size > exynos_gem->size) 52 return -EINVAL; 53 54 ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie, 55 exynos_gem->dma_addr, exynos_gem->size, 56 exynos_gem->dma_attrs); 57 if (ret < 0) { 58 DRM_DEV_ERROR(to_dma_dev(helper->dev), "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 DRM_FB_HELPER_DEFAULT_OPS, 68 .fb_mmap = exynos_drm_fb_mmap, 69 .fb_fillrect = drm_fb_helper_cfb_fillrect, 70 .fb_copyarea = drm_fb_helper_cfb_copyarea, 71 .fb_imageblit = drm_fb_helper_cfb_imageblit, 72 }; 73 74 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper, 75 struct drm_fb_helper_surface_size *sizes, 76 struct exynos_drm_gem *exynos_gem) 77 { 78 struct fb_info *fbi; 79 struct drm_framebuffer *fb = helper->fb; 80 unsigned int size = fb->width * fb->height * fb->format->cpp[0]; 81 unsigned int nr_pages; 82 unsigned long offset; 83 84 fbi = drm_fb_helper_alloc_fbi(helper); 85 if (IS_ERR(fbi)) { 86 DRM_DEV_ERROR(to_dma_dev(helper->dev), 87 "failed to allocate fb info.\n"); 88 return PTR_ERR(fbi); 89 } 90 91 fbi->fbops = &exynos_drm_fb_ops; 92 93 drm_fb_helper_fill_info(fbi, helper, sizes); 94 95 nr_pages = exynos_gem->size >> PAGE_SHIFT; 96 97 exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages, 98 VM_MAP, pgprot_writecombine(PAGE_KERNEL)); 99 if (!exynos_gem->kvaddr) { 100 DRM_DEV_ERROR(to_dma_dev(helper->dev), 101 "failed to map pages to kernel space.\n"); 102 return -EIO; 103 } 104 105 offset = fbi->var.xoffset * fb->format->cpp[0]; 106 offset += fbi->var.yoffset * fb->pitches[0]; 107 108 fbi->screen_base = exynos_gem->kvaddr + offset; 109 fbi->screen_size = size; 110 fbi->fix.smem_len = size; 111 112 return 0; 113 } 114 115 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 116 struct drm_fb_helper_surface_size *sizes) 117 { 118 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper); 119 struct exynos_drm_gem *exynos_gem; 120 struct drm_device *dev = helper->dev; 121 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 122 unsigned long size; 123 int ret; 124 125 DRM_DEV_DEBUG_KMS(dev->dev, 126 "surface width(%d), height(%d) and bpp(%d\n", 127 sizes->surface_width, sizes->surface_height, 128 sizes->surface_bpp); 129 130 mode_cmd.width = sizes->surface_width; 131 mode_cmd.height = sizes->surface_height; 132 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 133 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 134 sizes->surface_depth); 135 136 size = mode_cmd.pitches[0] * mode_cmd.height; 137 138 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size); 139 /* 140 * If physically contiguous memory allocation fails and if IOMMU is 141 * supported then try to get buffer from non physically contiguous 142 * memory area. 143 */ 144 if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) { 145 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n"); 146 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG, 147 size); 148 } 149 150 if (IS_ERR(exynos_gem)) 151 return PTR_ERR(exynos_gem); 152 153 exynos_fbdev->exynos_gem = exynos_gem; 154 155 helper->fb = 156 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1); 157 if (IS_ERR(helper->fb)) { 158 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n"); 159 ret = PTR_ERR(helper->fb); 160 goto err_destroy_gem; 161 } 162 163 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem); 164 if (ret < 0) 165 goto err_destroy_framebuffer; 166 167 return ret; 168 169 err_destroy_framebuffer: 170 drm_framebuffer_cleanup(helper->fb); 171 err_destroy_gem: 172 exynos_drm_gem_destroy(exynos_gem); 173 174 /* 175 * if failed, all resources allocated above would be released by 176 * drm_mode_config_cleanup() when drm_load() had been called prior 177 * to any specific driver such as fimd or hdmi driver. 178 */ 179 180 return ret; 181 } 182 183 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 184 .fb_probe = exynos_drm_fbdev_create, 185 }; 186 187 int exynos_drm_fbdev_init(struct drm_device *dev) 188 { 189 struct exynos_drm_fbdev *fbdev; 190 struct exynos_drm_private *private = dev->dev_private; 191 struct drm_fb_helper *helper; 192 int ret; 193 194 if (!dev->mode_config.num_crtc) 195 return 0; 196 197 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 198 if (!fbdev) 199 return -ENOMEM; 200 201 private->fb_helper = helper = &fbdev->drm_fb_helper; 202 203 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs); 204 205 ret = drm_fb_helper_init(dev, helper, MAX_CONNECTOR); 206 if (ret < 0) { 207 DRM_DEV_ERROR(dev->dev, 208 "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_DEV_ERROR(dev->dev, 215 "failed to register drm_fb_helper_connector.\n"); 216 goto err_setup; 217 218 } 219 220 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 221 if (ret < 0) { 222 DRM_DEV_ERROR(dev->dev, 223 "failed to set up hw configuration.\n"); 224 goto err_setup; 225 } 226 227 return 0; 228 229 err_setup: 230 drm_fb_helper_fini(helper); 231 232 err_init: 233 private->fb_helper = NULL; 234 kfree(fbdev); 235 236 return ret; 237 } 238 239 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 240 struct drm_fb_helper *fb_helper) 241 { 242 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper); 243 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem; 244 struct drm_framebuffer *fb; 245 246 vunmap(exynos_gem->kvaddr); 247 248 /* release drm framebuffer and real buffer */ 249 if (fb_helper->fb && fb_helper->fb->funcs) { 250 fb = fb_helper->fb; 251 if (fb) 252 drm_framebuffer_remove(fb); 253 } 254 255 drm_fb_helper_unregister_fbi(fb_helper); 256 257 drm_fb_helper_fini(fb_helper); 258 } 259 260 void exynos_drm_fbdev_fini(struct drm_device *dev) 261 { 262 struct exynos_drm_private *private = dev->dev_private; 263 struct exynos_drm_fbdev *fbdev; 264 265 if (!private || !private->fb_helper) 266 return; 267 268 fbdev = to_exynos_fbdev(private->fb_helper); 269 270 exynos_drm_fbdev_destroy(dev, private->fb_helper); 271 kfree(fbdev); 272 private->fb_helper = NULL; 273 } 274 275