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 #include <drm/drm_fb_helper.h> 21 #include <drm/drm_of.h> 22 23 #include "sun4i_crtc.h" 24 #include "sun4i_drv.h" 25 #include "sun4i_framebuffer.h" 26 #include "sun4i_layer.h" 27 #include "sun4i_tcon.h" 28 29 static int sun4i_drv_enable_vblank(struct drm_device *drm, unsigned int pipe) 30 { 31 struct sun4i_drv *drv = drm->dev_private; 32 struct sun4i_tcon *tcon = drv->tcon; 33 34 DRM_DEBUG_DRIVER("Enabling VBLANK on pipe %d\n", pipe); 35 36 sun4i_tcon_enable_vblank(tcon, true); 37 38 return 0; 39 } 40 41 static void sun4i_drv_disable_vblank(struct drm_device *drm, unsigned int pipe) 42 { 43 struct sun4i_drv *drv = drm->dev_private; 44 struct sun4i_tcon *tcon = drv->tcon; 45 46 DRM_DEBUG_DRIVER("Disabling VBLANK on pipe %d\n", pipe); 47 48 sun4i_tcon_enable_vblank(tcon, false); 49 } 50 51 static const struct file_operations sun4i_drv_fops = { 52 .owner = THIS_MODULE, 53 .open = drm_open, 54 .release = drm_release, 55 .unlocked_ioctl = drm_ioctl, 56 #ifdef CONFIG_COMPAT 57 .compat_ioctl = drm_compat_ioctl, 58 #endif 59 .poll = drm_poll, 60 .read = drm_read, 61 .llseek = no_llseek, 62 .mmap = drm_gem_cma_mmap, 63 }; 64 65 static struct drm_driver sun4i_drv_driver = { 66 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC, 67 68 /* Generic Operations */ 69 .fops = &sun4i_drv_fops, 70 .name = "sun4i-drm", 71 .desc = "Allwinner sun4i Display Engine", 72 .date = "20150629", 73 .major = 1, 74 .minor = 0, 75 76 /* GEM Operations */ 77 .dumb_create = drm_gem_cma_dumb_create, 78 .dumb_destroy = drm_gem_dumb_destroy, 79 .dumb_map_offset = drm_gem_cma_dumb_map_offset, 80 .gem_free_object_unlocked = drm_gem_cma_free_object, 81 .gem_vm_ops = &drm_gem_cma_vm_ops, 82 83 /* PRIME Operations */ 84 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 85 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 86 .gem_prime_import = drm_gem_prime_import, 87 .gem_prime_export = drm_gem_prime_export, 88 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 89 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 90 .gem_prime_vmap = drm_gem_cma_prime_vmap, 91 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 92 .gem_prime_mmap = drm_gem_cma_prime_mmap, 93 94 /* Frame Buffer Operations */ 95 96 /* VBlank Operations */ 97 .get_vblank_counter = drm_vblank_no_hw_counter, 98 .enable_vblank = sun4i_drv_enable_vblank, 99 .disable_vblank = sun4i_drv_disable_vblank, 100 }; 101 102 static void sun4i_remove_framebuffers(void) 103 { 104 struct apertures_struct *ap; 105 106 ap = alloc_apertures(1); 107 if (!ap) 108 return; 109 110 /* The framebuffer can be located anywhere in RAM */ 111 ap->ranges[0].base = 0; 112 ap->ranges[0].size = ~0; 113 114 drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false); 115 kfree(ap); 116 } 117 118 static int sun4i_drv_bind(struct device *dev) 119 { 120 struct drm_device *drm; 121 struct sun4i_drv *drv; 122 int ret; 123 124 drm = drm_dev_alloc(&sun4i_drv_driver, dev); 125 if (IS_ERR(drm)) 126 return PTR_ERR(drm); 127 128 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); 129 if (!drv) { 130 ret = -ENOMEM; 131 goto free_drm; 132 } 133 drm->dev_private = drv; 134 135 drm_vblank_init(drm, 1); 136 drm_mode_config_init(drm); 137 138 ret = component_bind_all(drm->dev, drm); 139 if (ret) { 140 dev_err(drm->dev, "Couldn't bind all pipelines components\n"); 141 goto free_drm; 142 } 143 144 /* Create our layers */ 145 drv->layers = sun4i_layers_init(drm); 146 if (!drv->layers) { 147 dev_err(drm->dev, "Couldn't create the planes\n"); 148 ret = -EINVAL; 149 goto free_drm; 150 } 151 152 /* Create our CRTC */ 153 drv->crtc = sun4i_crtc_init(drm); 154 if (!drv->crtc) { 155 dev_err(drm->dev, "Couldn't create the CRTC\n"); 156 ret = -EINVAL; 157 goto free_drm; 158 } 159 drm->irq_enabled = true; 160 161 /* Remove early framebuffers (ie. simplefb) */ 162 sun4i_remove_framebuffers(); 163 164 /* Create our framebuffer */ 165 drv->fbdev = sun4i_framebuffer_init(drm); 166 if (IS_ERR(drv->fbdev)) { 167 dev_err(drm->dev, "Couldn't create our framebuffer\n"); 168 ret = PTR_ERR(drv->fbdev); 169 goto free_drm; 170 } 171 172 /* Enable connectors polling */ 173 drm_kms_helper_poll_init(drm); 174 175 ret = drm_dev_register(drm, 0); 176 if (ret) 177 goto free_drm; 178 179 return 0; 180 181 free_drm: 182 drm_dev_unref(drm); 183 return ret; 184 } 185 186 static void sun4i_drv_unbind(struct device *dev) 187 { 188 struct drm_device *drm = dev_get_drvdata(dev); 189 190 drm_dev_unregister(drm); 191 drm_kms_helper_poll_fini(drm); 192 sun4i_framebuffer_free(drm); 193 drm_vblank_cleanup(drm); 194 drm_dev_unref(drm); 195 } 196 197 static const struct component_master_ops sun4i_drv_master_ops = { 198 .bind = sun4i_drv_bind, 199 .unbind = sun4i_drv_unbind, 200 }; 201 202 static bool sun4i_drv_node_is_frontend(struct device_node *node) 203 { 204 return of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") || 205 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend"); 206 } 207 208 static bool sun4i_drv_node_is_tcon(struct device_node *node) 209 { 210 return of_device_is_compatible(node, "allwinner,sun5i-a13-tcon") || 211 of_device_is_compatible(node, "allwinner,sun8i-a33-tcon"); 212 } 213 214 static int compare_of(struct device *dev, void *data) 215 { 216 DRM_DEBUG_DRIVER("Comparing of node %s with %s\n", 217 of_node_full_name(dev->of_node), 218 of_node_full_name(data)); 219 220 return dev->of_node == data; 221 } 222 223 static int sun4i_drv_add_endpoints(struct device *dev, 224 struct component_match **match, 225 struct device_node *node) 226 { 227 struct device_node *port, *ep, *remote; 228 int count = 0; 229 230 /* 231 * We don't support the frontend for now, so we will never 232 * have a device bound. Just skip over it, but we still want 233 * the rest our pipeline to be added. 234 */ 235 if (!sun4i_drv_node_is_frontend(node) && 236 !of_device_is_available(node)) 237 return 0; 238 239 if (!sun4i_drv_node_is_frontend(node)) { 240 /* Add current component */ 241 DRM_DEBUG_DRIVER("Adding component %s\n", 242 of_node_full_name(node)); 243 drm_of_component_match_add(dev, match, compare_of, node); 244 count++; 245 } 246 247 /* Inputs are listed first, then outputs */ 248 port = of_graph_get_port_by_id(node, 1); 249 if (!port) { 250 DRM_DEBUG_DRIVER("No output to bind\n"); 251 return count; 252 } 253 254 for_each_available_child_of_node(port, ep) { 255 remote = of_graph_get_remote_port_parent(ep); 256 if (!remote) { 257 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 258 of_node_put(remote); 259 continue; 260 } 261 262 /* 263 * If the node is our TCON, the first port is used for 264 * panel or bridges, and will not be part of the 265 * component framework. 266 */ 267 if (sun4i_drv_node_is_tcon(node)) { 268 struct of_endpoint endpoint; 269 270 if (of_graph_parse_endpoint(ep, &endpoint)) { 271 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 272 continue; 273 } 274 275 if (!endpoint.id) { 276 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 277 continue; 278 } 279 } 280 281 /* Walk down our tree */ 282 count += sun4i_drv_add_endpoints(dev, match, remote); 283 284 of_node_put(remote); 285 } 286 287 return count; 288 } 289 290 static int sun4i_drv_probe(struct platform_device *pdev) 291 { 292 struct component_match *match = NULL; 293 struct device_node *np = pdev->dev.of_node; 294 int i, count = 0; 295 296 for (i = 0;; i++) { 297 struct device_node *pipeline = of_parse_phandle(np, 298 "allwinner,pipelines", 299 i); 300 if (!pipeline) 301 break; 302 303 count += sun4i_drv_add_endpoints(&pdev->dev, &match, 304 pipeline); 305 of_node_put(pipeline); 306 307 DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n", 308 count, i); 309 } 310 311 if (count) 312 return component_master_add_with_match(&pdev->dev, 313 &sun4i_drv_master_ops, 314 match); 315 else 316 return 0; 317 } 318 319 static int sun4i_drv_remove(struct platform_device *pdev) 320 { 321 return 0; 322 } 323 324 static const struct of_device_id sun4i_drv_of_table[] = { 325 { .compatible = "allwinner,sun5i-a13-display-engine" }, 326 { .compatible = "allwinner,sun8i-a33-display-engine" }, 327 { } 328 }; 329 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 330 331 static struct platform_driver sun4i_drv_platform_driver = { 332 .probe = sun4i_drv_probe, 333 .remove = sun4i_drv_remove, 334 .driver = { 335 .name = "sun4i-drm", 336 .of_match_table = sun4i_drv_of_table, 337 }, 338 }; 339 module_platform_driver(sun4i_drv_platform_driver); 340 341 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 342 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 343 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 344 MODULE_LICENSE("GPL"); 345