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->par = helper; 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 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_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n", 126 sizes->surface_width, sizes->surface_height, 127 sizes->surface_bpp); 128 129 mode_cmd.width = sizes->surface_width; 130 mode_cmd.height = sizes->surface_height; 131 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 132 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 133 sizes->surface_depth); 134 135 size = mode_cmd.pitches[0] * mode_cmd.height; 136 137 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size); 138 /* 139 * If physically contiguous memory allocation fails and if IOMMU is 140 * supported then try to get buffer from non physically contiguous 141 * memory area. 142 */ 143 if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) { 144 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n"); 145 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG, 146 size); 147 } 148 149 if (IS_ERR(exynos_gem)) 150 return PTR_ERR(exynos_gem); 151 152 exynos_fbdev->exynos_gem = exynos_gem; 153 154 helper->fb = 155 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1); 156 if (IS_ERR(helper->fb)) { 157 DRM_ERROR("failed to create drm framebuffer.\n"); 158 ret = PTR_ERR(helper->fb); 159 goto err_destroy_gem; 160 } 161 162 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem); 163 if (ret < 0) 164 goto err_destroy_framebuffer; 165 166 return ret; 167 168 err_destroy_framebuffer: 169 drm_framebuffer_cleanup(helper->fb); 170 err_destroy_gem: 171 exynos_drm_gem_destroy(exynos_gem); 172 173 /* 174 * if failed, all resources allocated above would be released by 175 * drm_mode_config_cleanup() when drm_load() had been called prior 176 * to any specific driver such as fimd or hdmi driver. 177 */ 178 179 return ret; 180 } 181 182 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 183 .fb_probe = exynos_drm_fbdev_create, 184 }; 185 186 int exynos_drm_fbdev_init(struct drm_device *dev) 187 { 188 struct exynos_drm_fbdev *fbdev; 189 struct exynos_drm_private *private = dev->dev_private; 190 struct drm_fb_helper *helper; 191 int ret; 192 193 if (!dev->mode_config.num_crtc) 194 return 0; 195 196 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 197 if (!fbdev) 198 return -ENOMEM; 199 200 private->fb_helper = helper = &fbdev->drm_fb_helper; 201 202 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs); 203 204 ret = drm_fb_helper_init(dev, helper, MAX_CONNECTOR); 205 if (ret < 0) { 206 DRM_ERROR("failed to initialize drm fb helper.\n"); 207 goto err_init; 208 } 209 210 ret = drm_fb_helper_single_add_all_connectors(helper); 211 if (ret < 0) { 212 DRM_ERROR("failed to register drm_fb_helper_connector.\n"); 213 goto err_setup; 214 215 } 216 217 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 218 if (ret < 0) { 219 DRM_ERROR("failed to set up hw configuration.\n"); 220 goto err_setup; 221 } 222 223 return 0; 224 225 err_setup: 226 drm_fb_helper_fini(helper); 227 228 err_init: 229 private->fb_helper = NULL; 230 kfree(fbdev); 231 232 return ret; 233 } 234 235 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 236 struct drm_fb_helper *fb_helper) 237 { 238 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper); 239 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem; 240 struct drm_framebuffer *fb; 241 242 vunmap(exynos_gem->kvaddr); 243 244 /* release drm framebuffer and real buffer */ 245 if (fb_helper->fb && fb_helper->fb->funcs) { 246 fb = fb_helper->fb; 247 if (fb) 248 drm_framebuffer_remove(fb); 249 } 250 251 drm_fb_helper_unregister_fbi(fb_helper); 252 253 drm_fb_helper_fini(fb_helper); 254 } 255 256 void exynos_drm_fbdev_fini(struct drm_device *dev) 257 { 258 struct exynos_drm_private *private = dev->dev_private; 259 struct exynos_drm_fbdev *fbdev; 260 261 if (!private || !private->fb_helper) 262 return; 263 264 fbdev = to_exynos_fbdev(private->fb_helper); 265 266 exynos_drm_fbdev_destroy(dev, private->fb_helper); 267 kfree(fbdev); 268 private->fb_helper = NULL; 269 } 270 271