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 #include <linux/of_reserved_mem.h> 16 17 #include <drm/drmP.h> 18 #include <drm/drm_crtc_helper.h> 19 #include <drm/drm_fb_cma_helper.h> 20 #include <drm/drm_gem_cma_helper.h> 21 #include <drm/drm_fb_helper.h> 22 #include <drm/drm_of.h> 23 24 #include "sun4i_drv.h" 25 #include "sun4i_framebuffer.h" 26 #include "sun4i_tcon.h" 27 28 DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops); 29 30 static struct drm_driver sun4i_drv_driver = { 31 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC, 32 33 /* Generic Operations */ 34 .fops = &sun4i_drv_fops, 35 .name = "sun4i-drm", 36 .desc = "Allwinner sun4i Display Engine", 37 .date = "20150629", 38 .major = 1, 39 .minor = 0, 40 41 /* GEM Operations */ 42 .dumb_create = drm_gem_cma_dumb_create, 43 .dumb_destroy = drm_gem_dumb_destroy, 44 .dumb_map_offset = drm_gem_cma_dumb_map_offset, 45 .gem_free_object_unlocked = drm_gem_cma_free_object, 46 .gem_vm_ops = &drm_gem_cma_vm_ops, 47 48 /* PRIME Operations */ 49 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 50 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 51 .gem_prime_import = drm_gem_prime_import, 52 .gem_prime_export = drm_gem_prime_export, 53 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 54 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 55 .gem_prime_vmap = drm_gem_cma_prime_vmap, 56 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 57 .gem_prime_mmap = drm_gem_cma_prime_mmap, 58 59 /* Frame Buffer Operations */ 60 }; 61 62 static void sun4i_remove_framebuffers(void) 63 { 64 struct apertures_struct *ap; 65 66 ap = alloc_apertures(1); 67 if (!ap) 68 return; 69 70 /* The framebuffer can be located anywhere in RAM */ 71 ap->ranges[0].base = 0; 72 ap->ranges[0].size = ~0; 73 74 drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false); 75 kfree(ap); 76 } 77 78 static int sun4i_drv_bind(struct device *dev) 79 { 80 struct drm_device *drm; 81 struct sun4i_drv *drv; 82 int ret; 83 84 drm = drm_dev_alloc(&sun4i_drv_driver, dev); 85 if (IS_ERR(drm)) 86 return PTR_ERR(drm); 87 88 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); 89 if (!drv) { 90 ret = -ENOMEM; 91 goto free_drm; 92 } 93 drm->dev_private = drv; 94 INIT_LIST_HEAD(&drv->engine_list); 95 INIT_LIST_HEAD(&drv->tcon_list); 96 97 ret = of_reserved_mem_device_init(dev); 98 if (ret && ret != -ENODEV) { 99 dev_err(drm->dev, "Couldn't claim our memory region\n"); 100 goto free_drm; 101 } 102 103 /* drm_vblank_init calls kcalloc, which can fail */ 104 ret = drm_vblank_init(drm, 1); 105 if (ret) 106 goto free_mem_region; 107 108 drm_mode_config_init(drm); 109 110 ret = component_bind_all(drm->dev, drm); 111 if (ret) { 112 dev_err(drm->dev, "Couldn't bind all pipelines components\n"); 113 goto cleanup_mode_config; 114 } 115 116 drm->irq_enabled = true; 117 118 /* Remove early framebuffers (ie. simplefb) */ 119 sun4i_remove_framebuffers(); 120 121 /* Create our framebuffer */ 122 drv->fbdev = sun4i_framebuffer_init(drm); 123 if (IS_ERR(drv->fbdev)) { 124 dev_err(drm->dev, "Couldn't create our framebuffer\n"); 125 ret = PTR_ERR(drv->fbdev); 126 goto cleanup_mode_config; 127 } 128 129 /* Enable connectors polling */ 130 drm_kms_helper_poll_init(drm); 131 132 ret = drm_dev_register(drm, 0); 133 if (ret) 134 goto finish_poll; 135 136 return 0; 137 138 finish_poll: 139 drm_kms_helper_poll_fini(drm); 140 sun4i_framebuffer_free(drm); 141 cleanup_mode_config: 142 drm_mode_config_cleanup(drm); 143 free_mem_region: 144 of_reserved_mem_device_release(dev); 145 free_drm: 146 drm_dev_unref(drm); 147 return ret; 148 } 149 150 static void sun4i_drv_unbind(struct device *dev) 151 { 152 struct drm_device *drm = dev_get_drvdata(dev); 153 154 drm_dev_unregister(drm); 155 drm_kms_helper_poll_fini(drm); 156 sun4i_framebuffer_free(drm); 157 drm_mode_config_cleanup(drm); 158 of_reserved_mem_device_release(dev); 159 drm_dev_unref(drm); 160 } 161 162 static const struct component_master_ops sun4i_drv_master_ops = { 163 .bind = sun4i_drv_bind, 164 .unbind = sun4i_drv_unbind, 165 }; 166 167 static bool sun4i_drv_node_is_connector(struct device_node *node) 168 { 169 return of_device_is_compatible(node, "hdmi-connector"); 170 } 171 172 static bool sun4i_drv_node_is_frontend(struct device_node *node) 173 { 174 return of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") || 175 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") || 176 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend"); 177 } 178 179 static bool sun4i_drv_node_is_tcon(struct device_node *node) 180 { 181 return of_device_is_compatible(node, "allwinner,sun5i-a13-tcon") || 182 of_device_is_compatible(node, "allwinner,sun6i-a31-tcon") || 183 of_device_is_compatible(node, "allwinner,sun6i-a31s-tcon") || 184 of_device_is_compatible(node, "allwinner,sun8i-a33-tcon") || 185 of_device_is_compatible(node, "allwinner,sun8i-v3s-tcon"); 186 } 187 188 static int compare_of(struct device *dev, void *data) 189 { 190 DRM_DEBUG_DRIVER("Comparing of node %s with %s\n", 191 of_node_full_name(dev->of_node), 192 of_node_full_name(data)); 193 194 return dev->of_node == data; 195 } 196 197 static int sun4i_drv_add_endpoints(struct device *dev, 198 struct component_match **match, 199 struct device_node *node) 200 { 201 struct device_node *port, *ep, *remote; 202 int count = 0; 203 204 /* 205 * We don't support the frontend for now, so we will never 206 * have a device bound. Just skip over it, but we still want 207 * the rest our pipeline to be added. 208 */ 209 if (!sun4i_drv_node_is_frontend(node) && 210 !of_device_is_available(node)) 211 return 0; 212 213 /* 214 * The connectors will be the last nodes in our pipeline, we 215 * can just bail out. 216 */ 217 if (sun4i_drv_node_is_connector(node)) 218 return 0; 219 220 if (!sun4i_drv_node_is_frontend(node)) { 221 /* Add current component */ 222 DRM_DEBUG_DRIVER("Adding component %s\n", 223 of_node_full_name(node)); 224 drm_of_component_match_add(dev, match, compare_of, node); 225 count++; 226 } 227 228 /* Inputs are listed first, then outputs */ 229 port = of_graph_get_port_by_id(node, 1); 230 if (!port) { 231 DRM_DEBUG_DRIVER("No output to bind\n"); 232 return count; 233 } 234 235 for_each_available_child_of_node(port, ep) { 236 remote = of_graph_get_remote_port_parent(ep); 237 if (!remote) { 238 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 239 of_node_put(remote); 240 continue; 241 } 242 243 /* 244 * If the node is our TCON, the first port is used for 245 * panel or bridges, and will not be part of the 246 * component framework. 247 */ 248 if (sun4i_drv_node_is_tcon(node)) { 249 struct of_endpoint endpoint; 250 251 if (of_graph_parse_endpoint(ep, &endpoint)) { 252 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 253 continue; 254 } 255 256 if (!endpoint.id) { 257 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 258 continue; 259 } 260 } 261 262 /* Walk down our tree */ 263 count += sun4i_drv_add_endpoints(dev, match, remote); 264 265 of_node_put(remote); 266 } 267 268 return count; 269 } 270 271 static int sun4i_drv_probe(struct platform_device *pdev) 272 { 273 struct component_match *match = NULL; 274 struct device_node *np = pdev->dev.of_node; 275 int i, count = 0; 276 277 for (i = 0;; i++) { 278 struct device_node *pipeline = of_parse_phandle(np, 279 "allwinner,pipelines", 280 i); 281 if (!pipeline) 282 break; 283 284 count += sun4i_drv_add_endpoints(&pdev->dev, &match, 285 pipeline); 286 of_node_put(pipeline); 287 288 DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n", 289 count, i); 290 } 291 292 if (count) 293 return component_master_add_with_match(&pdev->dev, 294 &sun4i_drv_master_ops, 295 match); 296 else 297 return 0; 298 } 299 300 static int sun4i_drv_remove(struct platform_device *pdev) 301 { 302 return 0; 303 } 304 305 static const struct of_device_id sun4i_drv_of_table[] = { 306 { .compatible = "allwinner,sun5i-a10s-display-engine" }, 307 { .compatible = "allwinner,sun5i-a13-display-engine" }, 308 { .compatible = "allwinner,sun6i-a31-display-engine" }, 309 { .compatible = "allwinner,sun6i-a31s-display-engine" }, 310 { .compatible = "allwinner,sun8i-a33-display-engine" }, 311 { .compatible = "allwinner,sun8i-v3s-display-engine" }, 312 { } 313 }; 314 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 315 316 static struct platform_driver sun4i_drv_platform_driver = { 317 .probe = sun4i_drv_probe, 318 .remove = sun4i_drv_remove, 319 .driver = { 320 .name = "sun4i-drm", 321 .of_match_table = sun4i_drv_of_table, 322 }, 323 }; 324 module_platform_driver(sun4i_drv_platform_driver); 325 326 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 327 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 328 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 329 MODULE_LICENSE("GPL"); 330