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 long offset; 80 81 fbi = drm_fb_helper_alloc_fbi(helper); 82 if (IS_ERR(fbi)) { 83 DRM_DEV_ERROR(to_dma_dev(helper->dev), 84 "failed to allocate fb info.\n"); 85 return PTR_ERR(fbi); 86 } 87 88 fbi->fbops = &exynos_drm_fb_ops; 89 90 drm_fb_helper_fill_info(fbi, helper, sizes); 91 92 offset = fbi->var.xoffset * fb->format->cpp[0]; 93 offset += fbi->var.yoffset * fb->pitches[0]; 94 95 fbi->screen_buffer = exynos_gem->kvaddr + offset; 96 fbi->screen_size = size; 97 fbi->fix.smem_len = size; 98 99 return 0; 100 } 101 102 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 103 struct drm_fb_helper_surface_size *sizes) 104 { 105 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper); 106 struct exynos_drm_gem *exynos_gem; 107 struct drm_device *dev = helper->dev; 108 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 109 unsigned long size; 110 int ret; 111 112 DRM_DEV_DEBUG_KMS(dev->dev, 113 "surface width(%d), height(%d) and bpp(%d\n", 114 sizes->surface_width, sizes->surface_height, 115 sizes->surface_bpp); 116 117 mode_cmd.width = sizes->surface_width; 118 mode_cmd.height = sizes->surface_height; 119 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 120 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 121 sizes->surface_depth); 122 123 size = mode_cmd.pitches[0] * mode_cmd.height; 124 125 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_WC, size, true); 126 if (IS_ERR(exynos_gem)) 127 return PTR_ERR(exynos_gem); 128 129 exynos_fbdev->exynos_gem = exynos_gem; 130 131 helper->fb = 132 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1); 133 if (IS_ERR(helper->fb)) { 134 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n"); 135 ret = PTR_ERR(helper->fb); 136 goto err_destroy_gem; 137 } 138 139 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem); 140 if (ret < 0) 141 goto err_destroy_framebuffer; 142 143 return ret; 144 145 err_destroy_framebuffer: 146 drm_framebuffer_cleanup(helper->fb); 147 err_destroy_gem: 148 exynos_drm_gem_destroy(exynos_gem); 149 150 /* 151 * if failed, all resources allocated above would be released by 152 * drm_mode_config_cleanup() when drm_load() had been called prior 153 * to any specific driver such as fimd or hdmi driver. 154 */ 155 156 return ret; 157 } 158 159 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 160 .fb_probe = exynos_drm_fbdev_create, 161 }; 162 163 int exynos_drm_fbdev_init(struct drm_device *dev) 164 { 165 struct exynos_drm_fbdev *fbdev; 166 struct exynos_drm_private *private = dev->dev_private; 167 struct drm_fb_helper *helper; 168 int ret; 169 170 if (!dev->mode_config.num_crtc) 171 return 0; 172 173 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 174 if (!fbdev) 175 return -ENOMEM; 176 177 private->fb_helper = helper = &fbdev->drm_fb_helper; 178 179 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs); 180 181 ret = drm_fb_helper_init(dev, helper); 182 if (ret < 0) { 183 DRM_DEV_ERROR(dev->dev, 184 "failed to initialize drm fb helper.\n"); 185 goto err_init; 186 } 187 188 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 189 if (ret < 0) { 190 DRM_DEV_ERROR(dev->dev, 191 "failed to set up hw configuration.\n"); 192 goto err_setup; 193 } 194 195 return 0; 196 197 err_setup: 198 drm_fb_helper_fini(helper); 199 200 err_init: 201 private->fb_helper = NULL; 202 kfree(fbdev); 203 204 return ret; 205 } 206 207 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 208 struct drm_fb_helper *fb_helper) 209 { 210 struct drm_framebuffer *fb; 211 212 /* release drm framebuffer and real buffer */ 213 if (fb_helper->fb && fb_helper->fb->funcs) { 214 fb = fb_helper->fb; 215 if (fb) 216 drm_framebuffer_remove(fb); 217 } 218 219 drm_fb_helper_unregister_fbi(fb_helper); 220 221 drm_fb_helper_fini(fb_helper); 222 } 223 224 void exynos_drm_fbdev_fini(struct drm_device *dev) 225 { 226 struct exynos_drm_private *private = dev->dev_private; 227 struct exynos_drm_fbdev *fbdev; 228 229 if (!private || !private->fb_helper) 230 return; 231 232 fbdev = to_exynos_fbdev(private->fb_helper); 233 234 exynos_drm_fbdev_destroy(dev, private->fb_helper); 235 kfree(fbdev); 236 private->fb_helper = NULL; 237 } 238 239