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