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_framebuffer.h> 19 #include <drm/drm_prime.h> 20 #include <drm/drm_probe_helper.h> 21 #include <drm/exynos_drm.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 45 return drm_gem_prime_mmap(&exynos_gem->base, vma); 46 } 47 48 static const struct fb_ops exynos_drm_fb_ops = { 49 .owner = THIS_MODULE, 50 DRM_FB_HELPER_DEFAULT_OPS, 51 .fb_mmap = exynos_drm_fb_mmap, 52 .fb_fillrect = drm_fb_helper_cfb_fillrect, 53 .fb_copyarea = drm_fb_helper_cfb_copyarea, 54 .fb_imageblit = drm_fb_helper_cfb_imageblit, 55 }; 56 57 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper, 58 struct drm_fb_helper_surface_size *sizes, 59 struct exynos_drm_gem *exynos_gem) 60 { 61 struct fb_info *fbi; 62 struct drm_framebuffer *fb = helper->fb; 63 unsigned int size = fb->width * fb->height * fb->format->cpp[0]; 64 unsigned long offset; 65 66 fbi = drm_fb_helper_alloc_fbi(helper); 67 if (IS_ERR(fbi)) { 68 DRM_DEV_ERROR(to_dma_dev(helper->dev), 69 "failed to allocate fb info.\n"); 70 return PTR_ERR(fbi); 71 } 72 73 fbi->fbops = &exynos_drm_fb_ops; 74 75 drm_fb_helper_fill_info(fbi, helper, sizes); 76 77 offset = fbi->var.xoffset * fb->format->cpp[0]; 78 offset += fbi->var.yoffset * fb->pitches[0]; 79 80 fbi->screen_buffer = exynos_gem->kvaddr + offset; 81 fbi->screen_size = size; 82 fbi->fix.smem_len = size; 83 84 return 0; 85 } 86 87 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 88 struct drm_fb_helper_surface_size *sizes) 89 { 90 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper); 91 struct exynos_drm_gem *exynos_gem; 92 struct drm_device *dev = helper->dev; 93 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 94 unsigned long size; 95 int ret; 96 97 DRM_DEV_DEBUG_KMS(dev->dev, 98 "surface width(%d), height(%d) and bpp(%d\n", 99 sizes->surface_width, sizes->surface_height, 100 sizes->surface_bpp); 101 102 mode_cmd.width = sizes->surface_width; 103 mode_cmd.height = sizes->surface_height; 104 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 105 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 106 sizes->surface_depth); 107 108 size = mode_cmd.pitches[0] * mode_cmd.height; 109 110 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_WC, size, true); 111 if (IS_ERR(exynos_gem)) 112 return PTR_ERR(exynos_gem); 113 114 exynos_fbdev->exynos_gem = exynos_gem; 115 116 helper->fb = 117 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1); 118 if (IS_ERR(helper->fb)) { 119 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n"); 120 ret = PTR_ERR(helper->fb); 121 goto err_destroy_gem; 122 } 123 124 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem); 125 if (ret < 0) 126 goto err_destroy_framebuffer; 127 128 return ret; 129 130 err_destroy_framebuffer: 131 drm_framebuffer_cleanup(helper->fb); 132 err_destroy_gem: 133 exynos_drm_gem_destroy(exynos_gem); 134 135 /* 136 * if failed, all resources allocated above would be released by 137 * drm_mode_config_cleanup() when drm_load() had been called prior 138 * to any specific driver such as fimd or hdmi driver. 139 */ 140 141 return ret; 142 } 143 144 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 145 .fb_probe = exynos_drm_fbdev_create, 146 }; 147 148 int exynos_drm_fbdev_init(struct drm_device *dev) 149 { 150 struct exynos_drm_fbdev *fbdev; 151 struct exynos_drm_private *private = dev->dev_private; 152 struct drm_fb_helper *helper; 153 int ret; 154 155 if (!dev->mode_config.num_crtc) 156 return 0; 157 158 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); 159 if (!fbdev) 160 return -ENOMEM; 161 162 private->fb_helper = helper = &fbdev->drm_fb_helper; 163 164 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs); 165 166 ret = drm_fb_helper_init(dev, helper); 167 if (ret < 0) { 168 DRM_DEV_ERROR(dev->dev, 169 "failed to initialize drm fb helper.\n"); 170 goto err_init; 171 } 172 173 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP); 174 if (ret < 0) { 175 DRM_DEV_ERROR(dev->dev, 176 "failed to set up hw configuration.\n"); 177 goto err_setup; 178 } 179 180 return 0; 181 182 err_setup: 183 drm_fb_helper_fini(helper); 184 185 err_init: 186 private->fb_helper = NULL; 187 kfree(fbdev); 188 189 return ret; 190 } 191 192 static void exynos_drm_fbdev_destroy(struct drm_device *dev, 193 struct drm_fb_helper *fb_helper) 194 { 195 struct drm_framebuffer *fb; 196 197 /* release drm framebuffer and real buffer */ 198 if (fb_helper->fb && fb_helper->fb->funcs) { 199 fb = fb_helper->fb; 200 if (fb) 201 drm_framebuffer_remove(fb); 202 } 203 204 drm_fb_helper_unregister_fbi(fb_helper); 205 206 drm_fb_helper_fini(fb_helper); 207 } 208 209 void exynos_drm_fbdev_fini(struct drm_device *dev) 210 { 211 struct exynos_drm_private *private = dev->dev_private; 212 struct exynos_drm_fbdev *fbdev; 213 214 if (!private || !private->fb_helper) 215 return; 216 217 fbdev = to_exynos_fbdev(private->fb_helper); 218 219 exynos_drm_fbdev_destroy(dev, private->fb_helper); 220 kfree(fbdev); 221 private->fb_helper = NULL; 222 } 223 224