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_unlocked = 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 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); 127 if (!drv) { 128 ret = -ENOMEM; 129 goto free_drm; 130 } 131 drm->dev_private = drv; 132 133 drm_vblank_init(drm, 1); 134 drm_mode_config_init(drm); 135 136 ret = component_bind_all(drm->dev, drm); 137 if (ret) { 138 dev_err(drm->dev, "Couldn't bind all pipelines components\n"); 139 goto free_drm; 140 } 141 142 /* Create our layers */ 143 drv->layers = sun4i_layers_init(drm); 144 if (!drv->layers) { 145 dev_err(drm->dev, "Couldn't create the planes\n"); 146 ret = -EINVAL; 147 goto free_drm; 148 } 149 150 /* Create our CRTC */ 151 drv->crtc = sun4i_crtc_init(drm); 152 if (!drv->crtc) { 153 dev_err(drm->dev, "Couldn't create the CRTC\n"); 154 ret = -EINVAL; 155 goto free_drm; 156 } 157 drm->irq_enabled = true; 158 159 /* Remove early framebuffers (ie. simplefb) */ 160 sun4i_remove_framebuffers(); 161 162 /* Create our framebuffer */ 163 drv->fbdev = sun4i_framebuffer_init(drm); 164 if (IS_ERR(drv->fbdev)) { 165 dev_err(drm->dev, "Couldn't create our framebuffer\n"); 166 ret = PTR_ERR(drv->fbdev); 167 goto free_drm; 168 } 169 170 /* Enable connectors polling */ 171 drm_kms_helper_poll_init(drm); 172 173 ret = drm_dev_register(drm, 0); 174 if (ret) 175 goto free_drm; 176 177 return 0; 178 179 free_drm: 180 drm_dev_unref(drm); 181 return ret; 182 } 183 184 static void sun4i_drv_unbind(struct device *dev) 185 { 186 struct drm_device *drm = dev_get_drvdata(dev); 187 188 drm_dev_unregister(drm); 189 drm_kms_helper_poll_fini(drm); 190 sun4i_framebuffer_free(drm); 191 drm_vblank_cleanup(drm); 192 drm_dev_unref(drm); 193 } 194 195 static const struct component_master_ops sun4i_drv_master_ops = { 196 .bind = sun4i_drv_bind, 197 .unbind = sun4i_drv_unbind, 198 }; 199 200 static bool sun4i_drv_node_is_frontend(struct device_node *node) 201 { 202 return of_device_is_compatible(node, 203 "allwinner,sun5i-a13-display-frontend"); 204 } 205 206 static bool sun4i_drv_node_is_tcon(struct device_node *node) 207 { 208 return of_device_is_compatible(node, "allwinner,sun5i-a13-tcon"); 209 } 210 211 static int compare_of(struct device *dev, void *data) 212 { 213 DRM_DEBUG_DRIVER("Comparing of node %s with %s\n", 214 of_node_full_name(dev->of_node), 215 of_node_full_name(data)); 216 217 return dev->of_node == data; 218 } 219 220 static int sun4i_drv_add_endpoints(struct device *dev, 221 struct component_match **match, 222 struct device_node *node) 223 { 224 struct device_node *port, *ep, *remote; 225 int count = 0; 226 227 /* 228 * We don't support the frontend for now, so we will never 229 * have a device bound. Just skip over it, but we still want 230 * the rest our pipeline to be added. 231 */ 232 if (!sun4i_drv_node_is_frontend(node) && 233 !of_device_is_available(node)) 234 return 0; 235 236 if (!sun4i_drv_node_is_frontend(node)) { 237 /* Add current component */ 238 DRM_DEBUG_DRIVER("Adding component %s\n", 239 of_node_full_name(node)); 240 component_match_add(dev, match, compare_of, node); 241 count++; 242 } 243 244 /* Inputs are listed first, then outputs */ 245 port = of_graph_get_port_by_id(node, 1); 246 if (!port) { 247 DRM_DEBUG_DRIVER("No output to bind\n"); 248 return count; 249 } 250 251 for_each_available_child_of_node(port, ep) { 252 remote = of_graph_get_remote_port_parent(ep); 253 if (!remote) { 254 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 255 of_node_put(remote); 256 continue; 257 } 258 259 /* 260 * If the node is our TCON, the first port is used for our 261 * panel, and will not be part of the 262 * component framework. 263 */ 264 if (sun4i_drv_node_is_tcon(node)) { 265 struct of_endpoint endpoint; 266 267 if (of_graph_parse_endpoint(ep, &endpoint)) { 268 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 269 continue; 270 } 271 272 if (!endpoint.id) { 273 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 274 continue; 275 } 276 } 277 278 /* Walk down our tree */ 279 count += sun4i_drv_add_endpoints(dev, match, remote); 280 281 of_node_put(remote); 282 } 283 284 return count; 285 } 286 287 static int sun4i_drv_probe(struct platform_device *pdev) 288 { 289 struct component_match *match = NULL; 290 struct device_node *np = pdev->dev.of_node; 291 int i, count = 0; 292 293 for (i = 0;; i++) { 294 struct device_node *pipeline = of_parse_phandle(np, 295 "allwinner,pipelines", 296 i); 297 if (!pipeline) 298 break; 299 300 count += sun4i_drv_add_endpoints(&pdev->dev, &match, 301 pipeline); 302 of_node_put(pipeline); 303 304 DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n", 305 count, i); 306 } 307 308 if (count) 309 return component_master_add_with_match(&pdev->dev, 310 &sun4i_drv_master_ops, 311 match); 312 else 313 return 0; 314 } 315 316 static int sun4i_drv_remove(struct platform_device *pdev) 317 { 318 return 0; 319 } 320 321 static const struct of_device_id sun4i_drv_of_table[] = { 322 { .compatible = "allwinner,sun5i-a13-display-engine" }, 323 { } 324 }; 325 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 326 327 static struct platform_driver sun4i_drv_platform_driver = { 328 .probe = sun4i_drv_probe, 329 .remove = sun4i_drv_remove, 330 .driver = { 331 .name = "sun4i-drm", 332 .of_match_table = sun4i_drv_of_table, 333 }, 334 }; 335 module_platform_driver(sun4i_drv_platform_driver); 336 337 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 338 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 339 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 340 MODULE_LICENSE("GPL"); 341