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 <linux/console.h> 12 #include <linux/dma-mapping.h> 13 #include <linux/vmalloc.h> 14 15 #include <drm/drm_crtc.h> 16 #include <drm/drm_fb_helper.h> 17 #include <drm/drm_fourcc.h> 18 #include <drm/drm_probe_helper.h> 19 #include <drm/exynos_drm.h> 20 21 #include "exynos_drm_drv.h" 22 #include "exynos_drm_fb.h" 23 #include "exynos_drm_fbdev.h" 24 25 #define MAX_CONNECTOR 4 26 #define PREFERRED_BPP 32 27 28 #define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\ 29 drm_fb_helper) 30 31 struct exynos_drm_fbdev { 32 struct drm_fb_helper drm_fb_helper; 33 struct exynos_drm_gem *exynos_gem; 34 }; 35 36 static int exynos_drm_fb_mmap(struct fb_info *info, 37 struct vm_area_struct *vma) 38 { 39 struct drm_fb_helper *helper = info->par; 40 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper); 41 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem; 42 unsigned long vm_size; 43 int ret; 44 45 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; 46 47 vm_size = vma->vm_end - vma->vm_start; 48 49 if (vm_size > exynos_gem->size) 50 return -EINVAL; 51 52 ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie, 53 exynos_gem->dma_addr, exynos_gem->size, 54 exynos_gem->dma_attrs); 55 if (ret < 0) { 56 DRM_DEV_ERROR(to_dma_dev(helper->dev), "failed to mmap.\n"); 57 return ret; 58 } 59 60 return 0; 61 } 62 63 static const struct fb_ops exynos_drm_fb_ops = { 64 .owner = THIS_MODULE, 65 DRM_FB_HELPER_DEFAULT_OPS, 66 .fb_mmap = exynos_drm_fb_mmap, 67 .fb_fillrect = drm_fb_helper_cfb_fillrect, 68 .fb_copyarea = drm_fb_helper_cfb_copyarea, 69 .fb_imageblit = drm_fb_helper_cfb_imageblit, 70 }; 71 72 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper, 73 struct drm_fb_helper_surface_size *sizes, 74 struct exynos_drm_gem *exynos_gem) 75 { 76 struct fb_info *fbi; 77 struct drm_framebuffer *fb = helper->fb; 78 unsigned int size = fb->width * fb->height * fb->format->cpp[0]; 79 unsigned int nr_pages; 80 unsigned long offset; 81 82 fbi = drm_fb_helper_alloc_fbi(helper); 83 if (IS_ERR(fbi)) { 84 DRM_DEV_ERROR(to_dma_dev(helper->dev), 85 "failed to allocate fb info.\n"); 86 return PTR_ERR(fbi); 87 } 88 89 fbi->fbops = &exynos_drm_fb_ops; 90 91 drm_fb_helper_fill_info(fbi, helper, sizes); 92 93 nr_pages = exynos_gem->size >> PAGE_SHIFT; 94 95 exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages, 96 VM_MAP, pgprot_writecombine(PAGE_KERNEL)); 97 if (!exynos_gem->kvaddr) { 98 DRM_DEV_ERROR(to_dma_dev(helper->dev), 99 "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_DEV_DEBUG_KMS(dev->dev, 124 "surface width(%d), height(%d) and bpp(%d\n", 125 sizes->surface_width, sizes->surface_height, 126 sizes->surface_bpp); 127 128 mode_cmd.width = sizes->surface_width; 129 mode_cmd.height = sizes->surface_height; 130 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 131 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 132 sizes->surface_depth); 133 134 size = mode_cmd.pitches[0] * mode_cmd.height; 135 136 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size); 137 /* 138 * If physically contiguous memory allocation fails and if IOMMU is 139 * supported then try to get buffer from non physically contiguous 140 * memory area. 141 */ 142 if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) { 143 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n"); 144 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG, 145 size); 146 } 147 148 if (IS_ERR(exynos_gem)) 149 return PTR_ERR(exynos_gem); 150 151 exynos_fbdev->exynos_gem = exynos_gem; 152 153 helper->fb = 154 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1); 155 if (IS_ERR(helper->fb)) { 156 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n"); 157 ret = PTR_ERR(helper->fb); 158 goto err_destroy_gem; 159 } 160 161 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem); 162 if (ret < 0) 163 goto err_destroy_framebuffer; 164 165 return ret; 166 167 err_destroy_framebuffer: 168 drm_framebuffer_cleanup(helper->fb); 169 err_destroy_gem: 170 exynos_drm_gem_destroy(exynos_gem); 171 172 /* 173 * if failed, all resources allocated above would be released by 174 * drm_mode_config_cleanup() when drm_load() had been called prior 175 * to any specific driver such as fimd or hdmi driver. 176 */ 177 178 return ret; 179 } 180 181 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 182 .fb_probe = exynos_drm_fbdev_create, 183 }; 184 185 int exynos_drm_fbdev_init(struct drm_device *dev) 186 { 187 struct exynos_drm_fbdev *fbdev; 188 struct exynos_drm_private *private = dev->dev_private; 189 struct drm_fb_helper *helper; 190 int ret; 191 192 if (!dev->mode_config.num_crtc) 193 return 0; 194 195 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 196 if (!fbdev) 197 return -ENOMEM; 198 199 private->fb_helper = helper = &fbdev->drm_fb_helper; 200 201 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs); 202 203 ret = drm_fb_helper_init(dev, helper); 204 if (ret < 0) { 205 DRM_DEV_ERROR(dev->dev, 206 "failed to initialize drm fb helper.\n"); 207 goto err_init; 208 } 209 210 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 211 if (ret < 0) { 212 DRM_DEV_ERROR(dev->dev, 213 "failed to set up hw configuration.\n"); 214 goto err_setup; 215 } 216 217 return 0; 218 219 err_setup: 220 drm_fb_helper_fini(helper); 221 222 err_init: 223 private->fb_helper = NULL; 224 kfree(fbdev); 225 226 return ret; 227 } 228 229 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 230 struct drm_fb_helper *fb_helper) 231 { 232 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper); 233 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem; 234 struct drm_framebuffer *fb; 235 236 vunmap(exynos_gem->kvaddr); 237 238 /* release drm framebuffer and real buffer */ 239 if (fb_helper->fb && fb_helper->fb->funcs) { 240 fb = fb_helper->fb; 241 if (fb) 242 drm_framebuffer_remove(fb); 243 } 244 245 drm_fb_helper_unregister_fbi(fb_helper); 246 247 drm_fb_helper_fini(fb_helper); 248 } 249 250 void exynos_drm_fbdev_fini(struct drm_device *dev) 251 { 252 struct exynos_drm_private *private = dev->dev_private; 253 struct exynos_drm_fbdev *fbdev; 254 255 if (!private || !private->fb_helper) 256 return; 257 258 fbdev = to_exynos_fbdev(private->fb_helper); 259 260 exynos_drm_fbdev_destroy(dev, private->fb_helper); 261 kfree(fbdev); 262 private->fb_helper = NULL; 263 } 264 265