1 /* 2 * Copyright (C) 2015 Free Electrons 3 * Copyright (C) 2015 NextThing Co 4 * 5 * Maxime Ripard <maxime.ripard@free-electrons.com> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License as 9 * published by the Free Software Foundation; either version 2 of 10 * the License, or (at your option) any later version. 11 */ 12 13 #include <linux/component.h> 14 #include <linux/of_graph.h> 15 16 #include <drm/drmP.h> 17 #include <drm/drm_crtc_helper.h> 18 #include <drm/drm_fb_cma_helper.h> 19 #include <drm/drm_gem_cma_helper.h> 20 21 #include "sun4i_crtc.h" 22 #include "sun4i_drv.h" 23 #include "sun4i_framebuffer.h" 24 #include "sun4i_layer.h" 25 #include "sun4i_tcon.h" 26 27 static int sun4i_drv_enable_vblank(struct drm_device *drm, unsigned int pipe) 28 { 29 struct sun4i_drv *drv = drm->dev_private; 30 struct sun4i_tcon *tcon = drv->tcon; 31 32 DRM_DEBUG_DRIVER("Enabling VBLANK on pipe %d\n", pipe); 33 34 sun4i_tcon_enable_vblank(tcon, true); 35 36 return 0; 37 } 38 39 static void sun4i_drv_disable_vblank(struct drm_device *drm, unsigned int pipe) 40 { 41 struct sun4i_drv *drv = drm->dev_private; 42 struct sun4i_tcon *tcon = drv->tcon; 43 44 DRM_DEBUG_DRIVER("Disabling VBLANK on pipe %d\n", pipe); 45 46 sun4i_tcon_enable_vblank(tcon, false); 47 } 48 49 static const struct file_operations sun4i_drv_fops = { 50 .owner = THIS_MODULE, 51 .open = drm_open, 52 .release = drm_release, 53 .unlocked_ioctl = drm_ioctl, 54 #ifdef CONFIG_COMPAT 55 .compat_ioctl = drm_compat_ioctl, 56 #endif 57 .poll = drm_poll, 58 .read = drm_read, 59 .llseek = no_llseek, 60 .mmap = drm_gem_cma_mmap, 61 }; 62 63 static struct drm_driver sun4i_drv_driver = { 64 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC, 65 66 /* Generic Operations */ 67 .fops = &sun4i_drv_fops, 68 .name = "sun4i-drm", 69 .desc = "Allwinner sun4i Display Engine", 70 .date = "20150629", 71 .major = 1, 72 .minor = 0, 73 74 /* GEM Operations */ 75 .dumb_create = drm_gem_cma_dumb_create, 76 .dumb_destroy = drm_gem_dumb_destroy, 77 .dumb_map_offset = drm_gem_cma_dumb_map_offset, 78 .gem_free_object = drm_gem_cma_free_object, 79 .gem_vm_ops = &drm_gem_cma_vm_ops, 80 81 /* PRIME Operations */ 82 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 83 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 84 .gem_prime_import = drm_gem_prime_import, 85 .gem_prime_export = drm_gem_prime_export, 86 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 87 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 88 .gem_prime_vmap = drm_gem_cma_prime_vmap, 89 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 90 .gem_prime_mmap = drm_gem_cma_prime_mmap, 91 92 /* Frame Buffer Operations */ 93 94 /* VBlank Operations */ 95 .get_vblank_counter = drm_vblank_no_hw_counter, 96 .enable_vblank = sun4i_drv_enable_vblank, 97 .disable_vblank = sun4i_drv_disable_vblank, 98 }; 99 100 static void sun4i_remove_framebuffers(void) 101 { 102 struct apertures_struct *ap; 103 104 ap = alloc_apertures(1); 105 if (!ap) 106 return; 107 108 /* The framebuffer can be located anywhere in RAM */ 109 ap->ranges[0].base = 0; 110 ap->ranges[0].size = ~0; 111 112 remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false); 113 kfree(ap); 114 } 115 116 static int sun4i_drv_bind(struct device *dev) 117 { 118 struct drm_device *drm; 119 struct sun4i_drv *drv; 120 int ret; 121 122 drm = drm_dev_alloc(&sun4i_drv_driver, dev); 123 if (!drm) 124 return -ENOMEM; 125 126 ret = drm_dev_set_unique(drm, dev_name(drm->dev)); 127 if (ret) 128 goto free_drm; 129 130 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); 131 if (!drv) { 132 ret = -ENOMEM; 133 goto free_drm; 134 } 135 drm->dev_private = drv; 136 137 drm_vblank_init(drm, 1); 138 drm_mode_config_init(drm); 139 140 ret = component_bind_all(drm->dev, drm); 141 if (ret) { 142 dev_err(drm->dev, "Couldn't bind all pipelines components\n"); 143 goto free_drm; 144 } 145 146 /* Create our layers */ 147 drv->layers = sun4i_layers_init(drm); 148 if (!drv->layers) { 149 dev_err(drm->dev, "Couldn't create the planes\n"); 150 ret = -EINVAL; 151 goto free_drm; 152 } 153 154 /* Create our CRTC */ 155 drv->crtc = sun4i_crtc_init(drm); 156 if (!drv->crtc) { 157 dev_err(drm->dev, "Couldn't create the CRTC\n"); 158 ret = -EINVAL; 159 goto free_drm; 160 } 161 drm->irq_enabled = true; 162 163 /* Remove early framebuffers (ie. simplefb) */ 164 sun4i_remove_framebuffers(); 165 166 /* Create our framebuffer */ 167 drv->fbdev = sun4i_framebuffer_init(drm); 168 if (IS_ERR(drv->fbdev)) { 169 dev_err(drm->dev, "Couldn't create our framebuffer\n"); 170 ret = PTR_ERR(drv->fbdev); 171 goto free_drm; 172 } 173 174 /* Enable connectors polling */ 175 drm_kms_helper_poll_init(drm); 176 177 ret = drm_dev_register(drm, 0); 178 if (ret) 179 goto free_drm; 180 181 ret = drm_connector_register_all(drm); 182 if (ret) 183 goto unregister_drm; 184 185 return 0; 186 187 unregister_drm: 188 drm_dev_unregister(drm); 189 free_drm: 190 drm_dev_unref(drm); 191 return ret; 192 } 193 194 static void sun4i_drv_unbind(struct device *dev) 195 { 196 struct drm_device *drm = dev_get_drvdata(dev); 197 198 drm_connector_unregister_all(drm); 199 drm_dev_unregister(drm); 200 drm_kms_helper_poll_fini(drm); 201 sun4i_framebuffer_free(drm); 202 drm_vblank_cleanup(drm); 203 drm_dev_unref(drm); 204 } 205 206 static const struct component_master_ops sun4i_drv_master_ops = { 207 .bind = sun4i_drv_bind, 208 .unbind = sun4i_drv_unbind, 209 }; 210 211 static bool sun4i_drv_node_is_frontend(struct device_node *node) 212 { 213 return of_device_is_compatible(node, 214 "allwinner,sun5i-a13-display-frontend"); 215 } 216 217 static bool sun4i_drv_node_is_tcon(struct device_node *node) 218 { 219 return of_device_is_compatible(node, "allwinner,sun5i-a13-tcon"); 220 } 221 222 static int compare_of(struct device *dev, void *data) 223 { 224 DRM_DEBUG_DRIVER("Comparing of node %s with %s\n", 225 of_node_full_name(dev->of_node), 226 of_node_full_name(data)); 227 228 return dev->of_node == data; 229 } 230 231 static int sun4i_drv_add_endpoints(struct device *dev, 232 struct component_match **match, 233 struct device_node *node) 234 { 235 struct device_node *port, *ep, *remote; 236 int count = 0; 237 238 /* 239 * We don't support the frontend for now, so we will never 240 * have a device bound. Just skip over it, but we still want 241 * the rest our pipeline to be added. 242 */ 243 if (!sun4i_drv_node_is_frontend(node) && 244 !of_device_is_available(node)) 245 return 0; 246 247 if (!sun4i_drv_node_is_frontend(node)) { 248 /* Add current component */ 249 DRM_DEBUG_DRIVER("Adding component %s\n", 250 of_node_full_name(node)); 251 component_match_add(dev, match, compare_of, node); 252 count++; 253 } 254 255 /* Inputs are listed first, then outputs */ 256 port = of_graph_get_port_by_id(node, 1); 257 if (!port) { 258 DRM_DEBUG_DRIVER("No output to bind\n"); 259 return count; 260 } 261 262 for_each_available_child_of_node(port, ep) { 263 remote = of_graph_get_remote_port_parent(ep); 264 if (!remote) { 265 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 266 of_node_put(remote); 267 continue; 268 } 269 270 /* 271 * If the node is our TCON, the first port is used for our 272 * panel, and will not be part of the 273 * component framework. 274 */ 275 if (sun4i_drv_node_is_tcon(node)) { 276 struct of_endpoint endpoint; 277 278 if (of_graph_parse_endpoint(ep, &endpoint)) { 279 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 280 continue; 281 } 282 283 if (!endpoint.id) { 284 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 285 continue; 286 } 287 } 288 289 /* Walk down our tree */ 290 count += sun4i_drv_add_endpoints(dev, match, remote); 291 292 of_node_put(remote); 293 } 294 295 return count; 296 } 297 298 static int sun4i_drv_probe(struct platform_device *pdev) 299 { 300 struct component_match *match = NULL; 301 struct device_node *np = pdev->dev.of_node; 302 int i, count = 0; 303 304 for (i = 0;; i++) { 305 struct device_node *pipeline = of_parse_phandle(np, 306 "allwinner,pipelines", 307 i); 308 if (!pipeline) 309 break; 310 311 count += sun4i_drv_add_endpoints(&pdev->dev, &match, 312 pipeline); 313 of_node_put(pipeline); 314 315 DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n", 316 count, i); 317 } 318 319 if (count) 320 return component_master_add_with_match(&pdev->dev, 321 &sun4i_drv_master_ops, 322 match); 323 else 324 return 0; 325 } 326 327 static int sun4i_drv_remove(struct platform_device *pdev) 328 { 329 return 0; 330 } 331 332 static const struct of_device_id sun4i_drv_of_table[] = { 333 { .compatible = "allwinner,sun5i-a13-display-engine" }, 334 { } 335 }; 336 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 337 338 static struct platform_driver sun4i_drv_platform_driver = { 339 .probe = sun4i_drv_probe, 340 .remove = sun4i_drv_remove, 341 .driver = { 342 .name = "sun4i-drm", 343 .of_match_table = sun4i_drv_of_table, 344 }, 345 }; 346 module_platform_driver(sun4i_drv_platform_driver); 347 348 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 349 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 350 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 351 MODULE_LICENSE("GPL"); 352