1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012 Russell King 4 * Written from the i915 driver. 5 */ 6 7 #include <linux/errno.h> 8 #include <linux/fb.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 12 #include <drm/drm_crtc_helper.h> 13 #include <drm/drm_drv.h> 14 #include <drm/drm_fb_helper.h> 15 #include <drm/drm_fourcc.h> 16 17 #include "armada_crtc.h" 18 #include "armada_drm.h" 19 #include "armada_fb.h" 20 #include "armada_gem.h" 21 22 static void armada_fbdev_fb_destroy(struct fb_info *info) 23 { 24 struct drm_fb_helper *fbh = info->par; 25 26 drm_fb_helper_fini(fbh); 27 28 fbh->fb->funcs->destroy(fbh->fb); 29 30 drm_client_release(&fbh->client); 31 drm_fb_helper_unprepare(fbh); 32 kfree(fbh); 33 } 34 35 static const struct fb_ops armada_fb_ops = { 36 .owner = THIS_MODULE, 37 FB_DEFAULT_IOMEM_OPS, 38 DRM_FB_HELPER_DEFAULT_OPS, 39 .fb_destroy = armada_fbdev_fb_destroy, 40 }; 41 42 static int armada_fbdev_create(struct drm_fb_helper *fbh, 43 struct drm_fb_helper_surface_size *sizes) 44 { 45 struct drm_device *dev = fbh->dev; 46 struct drm_mode_fb_cmd2 mode; 47 struct armada_framebuffer *dfb; 48 struct armada_gem_object *obj; 49 struct fb_info *info; 50 int size, ret; 51 void *ptr; 52 53 memset(&mode, 0, sizeof(mode)); 54 mode.width = sizes->surface_width; 55 mode.height = sizes->surface_height; 56 mode.pitches[0] = armada_pitch(mode.width, sizes->surface_bpp); 57 mode.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, 58 sizes->surface_depth); 59 60 size = mode.pitches[0] * mode.height; 61 obj = armada_gem_alloc_private_object(dev, size); 62 if (!obj) { 63 DRM_ERROR("failed to allocate fb memory\n"); 64 return -ENOMEM; 65 } 66 67 ret = armada_gem_linear_back(dev, obj); 68 if (ret) { 69 drm_gem_object_put(&obj->obj); 70 return ret; 71 } 72 73 ptr = armada_gem_map_object(dev, obj); 74 if (!ptr) { 75 drm_gem_object_put(&obj->obj); 76 return -ENOMEM; 77 } 78 79 dfb = armada_framebuffer_create(dev, &mode, obj); 80 81 /* 82 * A reference is now held by the framebuffer object if 83 * successful, otherwise this drops the ref for the error path. 84 */ 85 drm_gem_object_put(&obj->obj); 86 87 if (IS_ERR(dfb)) 88 return PTR_ERR(dfb); 89 90 info = drm_fb_helper_alloc_info(fbh); 91 if (IS_ERR(info)) { 92 ret = PTR_ERR(info); 93 goto err_fballoc; 94 } 95 96 info->fbops = &armada_fb_ops; 97 info->fix.smem_start = obj->phys_addr; 98 info->fix.smem_len = obj->obj.size; 99 info->screen_size = obj->obj.size; 100 info->screen_base = ptr; 101 fbh->fb = &dfb->fb; 102 103 drm_fb_helper_fill_info(info, fbh, sizes); 104 105 DRM_DEBUG_KMS("allocated %dx%d %dbpp fb: 0x%08llx\n", 106 dfb->fb.width, dfb->fb.height, dfb->fb.format->cpp[0] * 8, 107 (unsigned long long)obj->phys_addr); 108 109 return 0; 110 111 err_fballoc: 112 dfb->fb.funcs->destroy(&dfb->fb); 113 return ret; 114 } 115 116 static int armada_fb_probe(struct drm_fb_helper *fbh, 117 struct drm_fb_helper_surface_size *sizes) 118 { 119 int ret = 0; 120 121 if (!fbh->fb) { 122 ret = armada_fbdev_create(fbh, sizes); 123 if (ret == 0) 124 ret = 1; 125 } 126 return ret; 127 } 128 129 static const struct drm_fb_helper_funcs armada_fb_helper_funcs = { 130 .fb_probe = armada_fb_probe, 131 }; 132 133 /* 134 * Fbdev client and struct drm_client_funcs 135 */ 136 137 static void armada_fbdev_client_unregister(struct drm_client_dev *client) 138 { 139 struct drm_fb_helper *fbh = drm_fb_helper_from_client(client); 140 141 if (fbh->info) { 142 drm_fb_helper_unregister_info(fbh); 143 } else { 144 drm_client_release(&fbh->client); 145 drm_fb_helper_unprepare(fbh); 146 kfree(fbh); 147 } 148 } 149 150 static int armada_fbdev_client_restore(struct drm_client_dev *client) 151 { 152 drm_fb_helper_lastclose(client->dev); 153 154 return 0; 155 } 156 157 static int armada_fbdev_client_hotplug(struct drm_client_dev *client) 158 { 159 struct drm_fb_helper *fbh = drm_fb_helper_from_client(client); 160 struct drm_device *dev = client->dev; 161 int ret; 162 163 if (dev->fb_helper) 164 return drm_fb_helper_hotplug_event(dev->fb_helper); 165 166 ret = drm_fb_helper_init(dev, fbh); 167 if (ret) 168 goto err_drm_err; 169 170 if (!drm_drv_uses_atomic_modeset(dev)) 171 drm_helper_disable_unused_functions(dev); 172 173 ret = drm_fb_helper_initial_config(fbh); 174 if (ret) 175 goto err_drm_fb_helper_fini; 176 177 return 0; 178 179 err_drm_fb_helper_fini: 180 drm_fb_helper_fini(fbh); 181 err_drm_err: 182 drm_err(dev, "armada: Failed to setup fbdev emulation (ret=%d)\n", ret); 183 return ret; 184 } 185 186 static const struct drm_client_funcs armada_fbdev_client_funcs = { 187 .owner = THIS_MODULE, 188 .unregister = armada_fbdev_client_unregister, 189 .restore = armada_fbdev_client_restore, 190 .hotplug = armada_fbdev_client_hotplug, 191 }; 192 193 void armada_fbdev_setup(struct drm_device *dev) 194 { 195 struct drm_fb_helper *fbh; 196 int ret; 197 198 drm_WARN(dev, !dev->registered, "Device has not been registered.\n"); 199 drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n"); 200 201 fbh = kzalloc(sizeof(*fbh), GFP_KERNEL); 202 if (!fbh) 203 return; 204 drm_fb_helper_prepare(dev, fbh, 32, &armada_fb_helper_funcs); 205 206 ret = drm_client_init(dev, &fbh->client, "fbdev", &armada_fbdev_client_funcs); 207 if (ret) { 208 drm_err(dev, "Failed to register client: %d\n", ret); 209 goto err_drm_client_init; 210 } 211 212 drm_client_register(&fbh->client); 213 214 return; 215 216 err_drm_client_init: 217 drm_fb_helper_unprepare(fbh); 218 kfree(fbh); 219 return; 220 } 221