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 .compat_ioctl = drm_compat_ioctl, 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 drm_fb_helper_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 (IS_ERR(drm)) 124 return PTR_ERR(drm); 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, "allwinner,sun5i-a13-display-frontend") || 203 of_device_is_compatible(node, "allwinner,sun8i-a33-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 of_device_is_compatible(node, "allwinner,sun8i-a33-tcon"); 210 } 211 212 static int compare_of(struct device *dev, void *data) 213 { 214 DRM_DEBUG_DRIVER("Comparing of node %s with %s\n", 215 of_node_full_name(dev->of_node), 216 of_node_full_name(data)); 217 218 return dev->of_node == data; 219 } 220 221 static int sun4i_drv_add_endpoints(struct device *dev, 222 struct component_match **match, 223 struct device_node *node) 224 { 225 struct device_node *port, *ep, *remote; 226 int count = 0; 227 228 /* 229 * We don't support the frontend for now, so we will never 230 * have a device bound. Just skip over it, but we still want 231 * the rest our pipeline to be added. 232 */ 233 if (!sun4i_drv_node_is_frontend(node) && 234 !of_device_is_available(node)) 235 return 0; 236 237 if (!sun4i_drv_node_is_frontend(node)) { 238 /* Add current component */ 239 DRM_DEBUG_DRIVER("Adding component %s\n", 240 of_node_full_name(node)); 241 drm_of_component_match_add(dev, match, compare_of, node); 242 count++; 243 } 244 245 /* Inputs are listed first, then outputs */ 246 port = of_graph_get_port_by_id(node, 1); 247 if (!port) { 248 DRM_DEBUG_DRIVER("No output to bind\n"); 249 return count; 250 } 251 252 for_each_available_child_of_node(port, ep) { 253 remote = of_graph_get_remote_port_parent(ep); 254 if (!remote) { 255 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 256 of_node_put(remote); 257 continue; 258 } 259 260 /* 261 * If the node is our TCON, the first port is used for 262 * panel or bridges, and will not be part of the 263 * component framework. 264 */ 265 if (sun4i_drv_node_is_tcon(node)) { 266 struct of_endpoint endpoint; 267 268 if (of_graph_parse_endpoint(ep, &endpoint)) { 269 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 270 continue; 271 } 272 273 if (!endpoint.id) { 274 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 275 continue; 276 } 277 } 278 279 /* Walk down our tree */ 280 count += sun4i_drv_add_endpoints(dev, match, remote); 281 282 of_node_put(remote); 283 } 284 285 return count; 286 } 287 288 static int sun4i_drv_probe(struct platform_device *pdev) 289 { 290 struct component_match *match = NULL; 291 struct device_node *np = pdev->dev.of_node; 292 int i, count = 0; 293 294 for (i = 0;; i++) { 295 struct device_node *pipeline = of_parse_phandle(np, 296 "allwinner,pipelines", 297 i); 298 if (!pipeline) 299 break; 300 301 count += sun4i_drv_add_endpoints(&pdev->dev, &match, 302 pipeline); 303 of_node_put(pipeline); 304 305 DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n", 306 count, i); 307 } 308 309 if (count) 310 return component_master_add_with_match(&pdev->dev, 311 &sun4i_drv_master_ops, 312 match); 313 else 314 return 0; 315 } 316 317 static int sun4i_drv_remove(struct platform_device *pdev) 318 { 319 return 0; 320 } 321 322 static const struct of_device_id sun4i_drv_of_table[] = { 323 { .compatible = "allwinner,sun5i-a13-display-engine" }, 324 { .compatible = "allwinner,sun8i-a33-display-engine" }, 325 { } 326 }; 327 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 328 329 static struct platform_driver sun4i_drv_platform_driver = { 330 .probe = sun4i_drv_probe, 331 .remove = sun4i_drv_remove, 332 .driver = { 333 .name = "sun4i-drm", 334 .of_match_table = sun4i_drv_of_table, 335 }, 336 }; 337 module_platform_driver(sun4i_drv_platform_driver); 338 339 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 340 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 341 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 342 MODULE_LICENSE("GPL"); 343