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/fb.h> 12 13 #include <drm/drm_crtc_helper.h> 14 #include <drm/drm_drv.h> 15 #include <drm/drm_fb_helper.h> 16 #include <drm/drm_framebuffer.h> 17 #include <drm/drm_gem_framebuffer_helper.h> 18 #include <drm/drm_prime.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 static int exynos_drm_fb_mmap(struct fb_info *info, struct vm_area_struct *vma) 29 { 30 struct drm_fb_helper *helper = info->par; 31 struct drm_gem_object *obj = drm_gem_fb_get_obj(helper->fb, 0); 32 33 return drm_gem_prime_mmap(obj, vma); 34 } 35 36 static void exynos_drm_fb_destroy(struct fb_info *info) 37 { 38 struct drm_fb_helper *fb_helper = info->par; 39 struct drm_framebuffer *fb = fb_helper->fb; 40 41 drm_fb_helper_fini(fb_helper); 42 43 drm_framebuffer_remove(fb); 44 45 drm_client_release(&fb_helper->client); 46 drm_fb_helper_unprepare(fb_helper); 47 kfree(fb_helper); 48 } 49 50 static const struct fb_ops exynos_drm_fb_ops = { 51 .owner = THIS_MODULE, 52 __FB_DEFAULT_IO_OPS_RDWR, 53 DRM_FB_HELPER_DEFAULT_OPS, 54 __FB_DEFAULT_IO_OPS_DRAW, 55 .fb_mmap = exynos_drm_fb_mmap, 56 .fb_destroy = exynos_drm_fb_destroy, 57 }; 58 59 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper, 60 struct drm_fb_helper_surface_size *sizes, 61 struct exynos_drm_gem *exynos_gem) 62 { 63 struct fb_info *fbi; 64 struct drm_framebuffer *fb = helper->fb; 65 unsigned int size = fb->width * fb->height * fb->format->cpp[0]; 66 unsigned long offset; 67 68 fbi = drm_fb_helper_alloc_info(helper); 69 if (IS_ERR(fbi)) { 70 DRM_DEV_ERROR(to_dma_dev(helper->dev), 71 "failed to allocate fb info.\n"); 72 return PTR_ERR(fbi); 73 } 74 75 fbi->fbops = &exynos_drm_fb_ops; 76 77 drm_fb_helper_fill_info(fbi, helper, sizes); 78 79 offset = fbi->var.xoffset * fb->format->cpp[0]; 80 offset += fbi->var.yoffset * fb->pitches[0]; 81 82 fbi->screen_buffer = exynos_gem->kvaddr + offset; 83 fbi->screen_size = size; 84 fbi->fix.smem_len = size; 85 86 return 0; 87 } 88 89 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 90 struct drm_fb_helper_surface_size *sizes) 91 { 92 struct exynos_drm_gem *exynos_gem; 93 struct drm_device *dev = helper->dev; 94 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 95 unsigned long size; 96 int ret; 97 98 DRM_DEV_DEBUG_KMS(dev->dev, 99 "surface width(%d), height(%d) and bpp(%d\n", 100 sizes->surface_width, sizes->surface_height, 101 sizes->surface_bpp); 102 103 mode_cmd.width = sizes->surface_width; 104 mode_cmd.height = sizes->surface_height; 105 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 106 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 107 sizes->surface_depth); 108 109 size = mode_cmd.pitches[0] * mode_cmd.height; 110 111 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_WC, size, true); 112 if (IS_ERR(exynos_gem)) 113 return PTR_ERR(exynos_gem); 114 115 helper->fb = 116 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1); 117 if (IS_ERR(helper->fb)) { 118 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n"); 119 ret = PTR_ERR(helper->fb); 120 goto err_destroy_gem; 121 } 122 123 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem); 124 if (ret < 0) 125 goto err_destroy_framebuffer; 126 127 return 0; 128 129 err_destroy_framebuffer: 130 drm_framebuffer_cleanup(helper->fb); 131 helper->fb = NULL; 132 err_destroy_gem: 133 exynos_drm_gem_destroy(exynos_gem); 134 return ret; 135 } 136 137 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 138 .fb_probe = exynos_drm_fbdev_create, 139 }; 140 141 /* 142 * struct drm_client 143 */ 144 145 static void exynos_drm_fbdev_client_unregister(struct drm_client_dev *client) 146 { 147 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); 148 149 if (fb_helper->info) { 150 drm_fb_helper_unregister_info(fb_helper); 151 } else { 152 drm_client_release(&fb_helper->client); 153 drm_fb_helper_unprepare(fb_helper); 154 kfree(fb_helper); 155 } 156 } 157 158 static int exynos_drm_fbdev_client_restore(struct drm_client_dev *client) 159 { 160 drm_fb_helper_lastclose(client->dev); 161 162 return 0; 163 } 164 165 static int exynos_drm_fbdev_client_hotplug(struct drm_client_dev *client) 166 { 167 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); 168 struct drm_device *dev = client->dev; 169 int ret; 170 171 if (dev->fb_helper) 172 return drm_fb_helper_hotplug_event(dev->fb_helper); 173 174 ret = drm_fb_helper_init(dev, fb_helper); 175 if (ret) 176 goto err_drm_err; 177 178 if (!drm_drv_uses_atomic_modeset(dev)) 179 drm_helper_disable_unused_functions(dev); 180 181 ret = drm_fb_helper_initial_config(fb_helper); 182 if (ret) 183 goto err_drm_fb_helper_fini; 184 185 return 0; 186 187 err_drm_fb_helper_fini: 188 drm_fb_helper_fini(fb_helper); 189 err_drm_err: 190 drm_err(dev, "Failed to setup fbdev emulation (ret=%d)\n", ret); 191 return ret; 192 } 193 194 static const struct drm_client_funcs exynos_drm_fbdev_client_funcs = { 195 .owner = THIS_MODULE, 196 .unregister = exynos_drm_fbdev_client_unregister, 197 .restore = exynos_drm_fbdev_client_restore, 198 .hotplug = exynos_drm_fbdev_client_hotplug, 199 }; 200 201 void exynos_drm_fbdev_setup(struct drm_device *dev) 202 { 203 struct drm_fb_helper *fb_helper; 204 int ret; 205 206 drm_WARN(dev, !dev->registered, "Device has not been registered.\n"); 207 drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n"); 208 209 fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL); 210 if (!fb_helper) 211 return; 212 drm_fb_helper_prepare(dev, fb_helper, PREFERRED_BPP, &exynos_drm_fb_helper_funcs); 213 214 ret = drm_client_init(dev, &fb_helper->client, "fbdev", &exynos_drm_fbdev_client_funcs); 215 if (ret) 216 goto err_drm_client_init; 217 218 drm_client_register(&fb_helper->client); 219 220 return; 221 222 err_drm_client_init: 223 drm_fb_helper_unprepare(fb_helper); 224 kfree(fb_helper); 225 } 226