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_ERROR("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_ERROR("failed to allocate fb info.\n"); 87 return PTR_ERR(fbi); 88 } 89 90 fbi->fbops = &exynos_drm_fb_ops; 91 92 drm_fb_helper_fill_info(fbi, helper, sizes); 93 94 nr_pages = exynos_gem->size >> PAGE_SHIFT; 95 96 exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages, 97 VM_MAP, pgprot_writecombine(PAGE_KERNEL)); 98 if (!exynos_gem->kvaddr) { 99 DRM_ERROR("failed to map pages to kernel space.\n"); 100 return -EIO; 101 } 102 103 offset = fbi->var.xoffset * fb->format->cpp[0]; 104 offset += fbi->var.yoffset * fb->pitches[0]; 105 106 fbi->screen_base = exynos_gem->kvaddr + offset; 107 fbi->screen_size = size; 108 fbi->fix.smem_len = size; 109 110 return 0; 111 } 112 113 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 114 struct drm_fb_helper_surface_size *sizes) 115 { 116 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper); 117 struct exynos_drm_gem *exynos_gem; 118 struct drm_device *dev = helper->dev; 119 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 120 unsigned long size; 121 int ret; 122 123 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", 124 sizes->surface_width, sizes->surface_height, 125 sizes->surface_bpp); 126 127 mode_cmd.width = sizes->surface_width; 128 mode_cmd.height = sizes->surface_height; 129 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 130 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 131 sizes->surface_depth); 132 133 size = mode_cmd.pitches[0] * mode_cmd.height; 134 135 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size); 136 /* 137 * If physically contiguous memory allocation fails and if IOMMU is 138 * supported then try to get buffer from non physically contiguous 139 * memory area. 140 */ 141 if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) { 142 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n"); 143 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG, 144 size); 145 } 146 147 if (IS_ERR(exynos_gem)) 148 return PTR_ERR(exynos_gem); 149 150 exynos_fbdev->exynos_gem = exynos_gem; 151 152 helper->fb = 153 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1); 154 if (IS_ERR(helper->fb)) { 155 DRM_ERROR("failed to create drm framebuffer.\n"); 156 ret = PTR_ERR(helper->fb); 157 goto err_destroy_gem; 158 } 159 160 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem); 161 if (ret < 0) 162 goto err_destroy_framebuffer; 163 164 return ret; 165 166 err_destroy_framebuffer: 167 drm_framebuffer_cleanup(helper->fb); 168 err_destroy_gem: 169 exynos_drm_gem_destroy(exynos_gem); 170 171 /* 172 * if failed, all resources allocated above would be released by 173 * drm_mode_config_cleanup() when drm_load() had been called prior 174 * to any specific driver such as fimd or hdmi driver. 175 */ 176 177 return ret; 178 } 179 180 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 181 .fb_probe = exynos_drm_fbdev_create, 182 }; 183 184 int exynos_drm_fbdev_init(struct drm_device *dev) 185 { 186 struct exynos_drm_fbdev *fbdev; 187 struct exynos_drm_private *private = dev->dev_private; 188 struct drm_fb_helper *helper; 189 int ret; 190 191 if (!dev->mode_config.num_crtc) 192 return 0; 193 194 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 195 if (!fbdev) 196 return -ENOMEM; 197 198 private->fb_helper = helper = &fbdev->drm_fb_helper; 199 200 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs); 201 202 ret = drm_fb_helper_init(dev, helper, MAX_CONNECTOR); 203 if (ret < 0) { 204 DRM_ERROR("failed to initialize drm fb helper.\n"); 205 goto err_init; 206 } 207 208 ret = drm_fb_helper_single_add_all_connectors(helper); 209 if (ret < 0) { 210 DRM_ERROR("failed to register drm_fb_helper_connector.\n"); 211 goto err_setup; 212 213 } 214 215 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 216 if (ret < 0) { 217 DRM_ERROR("failed to set up hw configuration.\n"); 218 goto err_setup; 219 } 220 221 return 0; 222 223 err_setup: 224 drm_fb_helper_fini(helper); 225 226 err_init: 227 private->fb_helper = NULL; 228 kfree(fbdev); 229 230 return ret; 231 } 232 233 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 234 struct drm_fb_helper *fb_helper) 235 { 236 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper); 237 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem; 238 struct drm_framebuffer *fb; 239 240 vunmap(exynos_gem->kvaddr); 241 242 /* release drm framebuffer and real buffer */ 243 if (fb_helper->fb && fb_helper->fb->funcs) { 244 fb = fb_helper->fb; 245 if (fb) 246 drm_framebuffer_remove(fb); 247 } 248 249 drm_fb_helper_unregister_fbi(fb_helper); 250 251 drm_fb_helper_fini(fb_helper); 252 } 253 254 void exynos_drm_fbdev_fini(struct drm_device *dev) 255 { 256 struct exynos_drm_private *private = dev->dev_private; 257 struct exynos_drm_fbdev *fbdev; 258 259 if (!private || !private->fb_helper) 260 return; 261 262 fbdev = to_exynos_fbdev(private->fb_helper); 263 264 exynos_drm_fbdev_destroy(dev, private->fb_helper); 265 kfree(fbdev); 266 private->fb_helper = NULL; 267 } 268 269