1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* exynos_drm_fbdev.c 3 * 4 * Copyright (c) 2011 Samsung Electronics Co., Ltd. 5 * Authors: 6 * Inki Dae <inki.dae@samsung.com> 7 * Joonyoung Shim <jy0922.shim@samsung.com> 8 * Seung-Woo Kim <sw0312.kim@samsung.com> 9 */ 10 11 #include <drm/drmP.h> 12 #include <drm/drm_crtc.h> 13 #include <drm/drm_fb_helper.h> 14 #include <drm/drm_probe_helper.h> 15 #include <drm/exynos_drm.h> 16 17 #include <linux/console.h> 18 19 #include "exynos_drm_drv.h" 20 #include "exynos_drm_fb.h" 21 #include "exynos_drm_fbdev.h" 22 23 #define MAX_CONNECTOR 4 24 #define PREFERRED_BPP 32 25 26 #define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\ 27 drm_fb_helper) 28 29 struct exynos_drm_fbdev { 30 struct drm_fb_helper drm_fb_helper; 31 struct exynos_drm_gem *exynos_gem; 32 }; 33 34 static int exynos_drm_fb_mmap(struct fb_info *info, 35 struct vm_area_struct *vma) 36 { 37 struct drm_fb_helper *helper = info->par; 38 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper); 39 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem; 40 unsigned long vm_size; 41 int ret; 42 43 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 44 45 vm_size = vma->vm_end - vma->vm_start; 46 47 if (vm_size > exynos_gem->size) 48 return -EINVAL; 49 50 ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie, 51 exynos_gem->dma_addr, exynos_gem->size, 52 exynos_gem->dma_attrs); 53 if (ret < 0) { 54 DRM_DEV_ERROR(to_dma_dev(helper->dev), "failed to mmap.\n"); 55 return ret; 56 } 57 58 return 0; 59 } 60 61 static struct fb_ops exynos_drm_fb_ops = { 62 .owner = THIS_MODULE, 63 DRM_FB_HELPER_DEFAULT_OPS, 64 .fb_mmap = exynos_drm_fb_mmap, 65 .fb_fillrect = drm_fb_helper_cfb_fillrect, 66 .fb_copyarea = drm_fb_helper_cfb_copyarea, 67 .fb_imageblit = drm_fb_helper_cfb_imageblit, 68 }; 69 70 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper, 71 struct drm_fb_helper_surface_size *sizes, 72 struct exynos_drm_gem *exynos_gem) 73 { 74 struct fb_info *fbi; 75 struct drm_framebuffer *fb = helper->fb; 76 unsigned int size = fb->width * fb->height * fb->format->cpp[0]; 77 unsigned int nr_pages; 78 unsigned long offset; 79 80 fbi = drm_fb_helper_alloc_fbi(helper); 81 if (IS_ERR(fbi)) { 82 DRM_DEV_ERROR(to_dma_dev(helper->dev), 83 "failed to allocate fb info.\n"); 84 return PTR_ERR(fbi); 85 } 86 87 fbi->fbops = &exynos_drm_fb_ops; 88 89 drm_fb_helper_fill_info(fbi, helper, sizes); 90 91 nr_pages = exynos_gem->size >> PAGE_SHIFT; 92 93 exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages, 94 VM_MAP, pgprot_writecombine(PAGE_KERNEL)); 95 if (!exynos_gem->kvaddr) { 96 DRM_DEV_ERROR(to_dma_dev(helper->dev), 97 "failed to map pages to kernel space.\n"); 98 return -EIO; 99 } 100 101 offset = fbi->var.xoffset * fb->format->cpp[0]; 102 offset += fbi->var.yoffset * fb->pitches[0]; 103 104 fbi->screen_base = exynos_gem->kvaddr + offset; 105 fbi->screen_size = size; 106 fbi->fix.smem_len = size; 107 108 return 0; 109 } 110 111 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 112 struct drm_fb_helper_surface_size *sizes) 113 { 114 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper); 115 struct exynos_drm_gem *exynos_gem; 116 struct drm_device *dev = helper->dev; 117 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 118 unsigned long size; 119 int ret; 120 121 DRM_DEV_DEBUG_KMS(dev->dev, 122 "surface width(%d), height(%d) and bpp(%d\n", 123 sizes->surface_width, sizes->surface_height, 124 sizes->surface_bpp); 125 126 mode_cmd.width = sizes->surface_width; 127 mode_cmd.height = sizes->surface_height; 128 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 129 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 130 sizes->surface_depth); 131 132 size = mode_cmd.pitches[0] * mode_cmd.height; 133 134 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size); 135 /* 136 * If physically contiguous memory allocation fails and if IOMMU is 137 * supported then try to get buffer from non physically contiguous 138 * memory area. 139 */ 140 if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) { 141 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n"); 142 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG, 143 size); 144 } 145 146 if (IS_ERR(exynos_gem)) 147 return PTR_ERR(exynos_gem); 148 149 exynos_fbdev->exynos_gem = exynos_gem; 150 151 helper->fb = 152 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1); 153 if (IS_ERR(helper->fb)) { 154 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n"); 155 ret = PTR_ERR(helper->fb); 156 goto err_destroy_gem; 157 } 158 159 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem); 160 if (ret < 0) 161 goto err_destroy_framebuffer; 162 163 return ret; 164 165 err_destroy_framebuffer: 166 drm_framebuffer_cleanup(helper->fb); 167 err_destroy_gem: 168 exynos_drm_gem_destroy(exynos_gem); 169 170 /* 171 * if failed, all resources allocated above would be released by 172 * drm_mode_config_cleanup() when drm_load() had been called prior 173 * to any specific driver such as fimd or hdmi driver. 174 */ 175 176 return ret; 177 } 178 179 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 180 .fb_probe = exynos_drm_fbdev_create, 181 }; 182 183 int exynos_drm_fbdev_init(struct drm_device *dev) 184 { 185 struct exynos_drm_fbdev *fbdev; 186 struct exynos_drm_private *private = dev->dev_private; 187 struct drm_fb_helper *helper; 188 int ret; 189 190 if (!dev->mode_config.num_crtc) 191 return 0; 192 193 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 194 if (!fbdev) 195 return -ENOMEM; 196 197 private->fb_helper = helper = &fbdev->drm_fb_helper; 198 199 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs); 200 201 ret = drm_fb_helper_init(dev, helper, MAX_CONNECTOR); 202 if (ret < 0) { 203 DRM_DEV_ERROR(dev->dev, 204 "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_DEV_ERROR(dev->dev, 211 "failed to register drm_fb_helper_connector.\n"); 212 goto err_setup; 213 214 } 215 216 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 217 if (ret < 0) { 218 DRM_DEV_ERROR(dev->dev, 219 "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