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