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_DMAMEM_OPS_RDWR, 53 DRM_FB_HELPER_DEFAULT_OPS, 54 __FB_DEFAULT_DMAMEM_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->flags |= FBINFO_VIRTFB; 83 fbi->screen_buffer = exynos_gem->kvaddr + offset; 84 fbi->screen_size = size; 85 fbi->fix.smem_len = size; 86 87 return 0; 88 } 89 90 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper, 91 struct drm_fb_helper_surface_size *sizes) 92 { 93 struct exynos_drm_gem *exynos_gem; 94 struct drm_device *dev = helper->dev; 95 struct drm_mode_fb_cmd2 mode_cmd = { 0 }; 96 unsigned long size; 97 int ret; 98 99 DRM_DEV_DEBUG_KMS(dev->dev, 100 "surface width(%d), height(%d) and bpp(%d\n", 101 sizes->surface_width, sizes->surface_height, 102 sizes->surface_bpp); 103 104 mode_cmd.width = sizes->surface_width; 105 mode_cmd.height = sizes->surface_height; 106 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3); 107 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 108 sizes->surface_depth); 109 110 size = mode_cmd.pitches[0] * mode_cmd.height; 111 112 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_WC, size, true); 113 if (IS_ERR(exynos_gem)) 114 return PTR_ERR(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 0; 129 130 err_destroy_framebuffer: 131 drm_framebuffer_cleanup(helper->fb); 132 helper->fb = NULL; 133 err_destroy_gem: 134 exynos_drm_gem_destroy(exynos_gem); 135 return ret; 136 } 137 138 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = { 139 .fb_probe = exynos_drm_fbdev_create, 140 }; 141 142 /* 143 * struct drm_client 144 */ 145 146 static void exynos_drm_fbdev_client_unregister(struct drm_client_dev *client) 147 { 148 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); 149 150 if (fb_helper->info) { 151 drm_fb_helper_unregister_info(fb_helper); 152 } else { 153 drm_client_release(&fb_helper->client); 154 drm_fb_helper_unprepare(fb_helper); 155 kfree(fb_helper); 156 } 157 } 158 159 static int exynos_drm_fbdev_client_restore(struct drm_client_dev *client) 160 { 161 drm_fb_helper_lastclose(client->dev); 162 163 return 0; 164 } 165 166 static int exynos_drm_fbdev_client_hotplug(struct drm_client_dev *client) 167 { 168 struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); 169 struct drm_device *dev = client->dev; 170 int ret; 171 172 if (dev->fb_helper) 173 return drm_fb_helper_hotplug_event(dev->fb_helper); 174 175 ret = drm_fb_helper_init(dev, fb_helper); 176 if (ret) 177 goto err_drm_err; 178 179 if (!drm_drv_uses_atomic_modeset(dev)) 180 drm_helper_disable_unused_functions(dev); 181 182 ret = drm_fb_helper_initial_config(fb_helper); 183 if (ret) 184 goto err_drm_fb_helper_fini; 185 186 return 0; 187 188 err_drm_fb_helper_fini: 189 drm_fb_helper_fini(fb_helper); 190 err_drm_err: 191 drm_err(dev, "Failed to setup fbdev emulation (ret=%d)\n", ret); 192 return ret; 193 } 194 195 static const struct drm_client_funcs exynos_drm_fbdev_client_funcs = { 196 .owner = THIS_MODULE, 197 .unregister = exynos_drm_fbdev_client_unregister, 198 .restore = exynos_drm_fbdev_client_restore, 199 .hotplug = exynos_drm_fbdev_client_hotplug, 200 }; 201 202 void exynos_drm_fbdev_setup(struct drm_device *dev) 203 { 204 struct drm_fb_helper *fb_helper; 205 int ret; 206 207 drm_WARN(dev, !dev->registered, "Device has not been registered.\n"); 208 drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n"); 209 210 fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL); 211 if (!fb_helper) 212 return; 213 drm_fb_helper_prepare(dev, fb_helper, PREFERRED_BPP, &exynos_drm_fb_helper_funcs); 214 215 ret = drm_client_init(dev, &fb_helper->client, "fbdev", &exynos_drm_fbdev_client_funcs); 216 if (ret) 217 goto err_drm_client_init; 218 219 drm_client_register(&fb_helper->client); 220 221 return; 222 223 err_drm_client_init: 224 drm_fb_helper_unprepare(fb_helper); 225 kfree(fb_helper); 226 } 227