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 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 95 drm_vblank_init(drm, 1); 96 drm_mode_config_init(drm); 97 98 ret = component_bind_all(drm->dev, drm); 99 if (ret) { 100 dev_err(drm->dev, "Couldn't bind all pipelines components\n"); 101 goto free_drm; 102 } 103 104 /* Create our layers */ 105 drv->layers = sun4i_layers_init(drm); 106 if (IS_ERR(drv->layers)) { 107 dev_err(drm->dev, "Couldn't create the planes\n"); 108 ret = PTR_ERR(drv->layers); 109 goto free_drm; 110 } 111 112 /* Create our CRTC */ 113 drv->crtc = sun4i_crtc_init(drm); 114 if (!drv->crtc) { 115 dev_err(drm->dev, "Couldn't create the CRTC\n"); 116 ret = -EINVAL; 117 goto free_drm; 118 } 119 drm->irq_enabled = true; 120 121 /* Remove early framebuffers (ie. simplefb) */ 122 sun4i_remove_framebuffers(); 123 124 /* Create our framebuffer */ 125 drv->fbdev = sun4i_framebuffer_init(drm); 126 if (IS_ERR(drv->fbdev)) { 127 dev_err(drm->dev, "Couldn't create our framebuffer\n"); 128 ret = PTR_ERR(drv->fbdev); 129 goto free_drm; 130 } 131 132 /* Enable connectors polling */ 133 drm_kms_helper_poll_init(drm); 134 135 ret = drm_dev_register(drm, 0); 136 if (ret) 137 goto free_drm; 138 139 return 0; 140 141 free_drm: 142 drm_dev_unref(drm); 143 return ret; 144 } 145 146 static void sun4i_drv_unbind(struct device *dev) 147 { 148 struct drm_device *drm = dev_get_drvdata(dev); 149 150 drm_dev_unregister(drm); 151 drm_kms_helper_poll_fini(drm); 152 sun4i_framebuffer_free(drm); 153 drm_vblank_cleanup(drm); 154 drm_dev_unref(drm); 155 } 156 157 static const struct component_master_ops sun4i_drv_master_ops = { 158 .bind = sun4i_drv_bind, 159 .unbind = sun4i_drv_unbind, 160 }; 161 162 static bool sun4i_drv_node_is_frontend(struct device_node *node) 163 { 164 return of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") || 165 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") || 166 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend"); 167 } 168 169 static bool sun4i_drv_node_is_tcon(struct device_node *node) 170 { 171 return of_device_is_compatible(node, "allwinner,sun5i-a13-tcon") || 172 of_device_is_compatible(node, "allwinner,sun6i-a31-tcon") || 173 of_device_is_compatible(node, "allwinner,sun6i-a31s-tcon") || 174 of_device_is_compatible(node, "allwinner,sun8i-a33-tcon"); 175 } 176 177 static int compare_of(struct device *dev, void *data) 178 { 179 DRM_DEBUG_DRIVER("Comparing of node %s with %s\n", 180 of_node_full_name(dev->of_node), 181 of_node_full_name(data)); 182 183 return dev->of_node == data; 184 } 185 186 static int sun4i_drv_add_endpoints(struct device *dev, 187 struct component_match **match, 188 struct device_node *node) 189 { 190 struct device_node *port, *ep, *remote; 191 int count = 0; 192 193 /* 194 * We don't support the frontend for now, so we will never 195 * have a device bound. Just skip over it, but we still want 196 * the rest our pipeline to be added. 197 */ 198 if (!sun4i_drv_node_is_frontend(node) && 199 !of_device_is_available(node)) 200 return 0; 201 202 if (!sun4i_drv_node_is_frontend(node)) { 203 /* Add current component */ 204 DRM_DEBUG_DRIVER("Adding component %s\n", 205 of_node_full_name(node)); 206 drm_of_component_match_add(dev, match, compare_of, node); 207 count++; 208 } 209 210 /* Inputs are listed first, then outputs */ 211 port = of_graph_get_port_by_id(node, 1); 212 if (!port) { 213 DRM_DEBUG_DRIVER("No output to bind\n"); 214 return count; 215 } 216 217 for_each_available_child_of_node(port, ep) { 218 remote = of_graph_get_remote_port_parent(ep); 219 if (!remote) { 220 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 221 of_node_put(remote); 222 continue; 223 } 224 225 /* 226 * If the node is our TCON, the first port is used for 227 * panel or bridges, and will not be part of the 228 * component framework. 229 */ 230 if (sun4i_drv_node_is_tcon(node)) { 231 struct of_endpoint endpoint; 232 233 if (of_graph_parse_endpoint(ep, &endpoint)) { 234 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 235 continue; 236 } 237 238 if (!endpoint.id) { 239 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 240 continue; 241 } 242 } 243 244 /* Walk down our tree */ 245 count += sun4i_drv_add_endpoints(dev, match, remote); 246 247 of_node_put(remote); 248 } 249 250 return count; 251 } 252 253 static int sun4i_drv_probe(struct platform_device *pdev) 254 { 255 struct component_match *match = NULL; 256 struct device_node *np = pdev->dev.of_node; 257 int i, count = 0; 258 259 for (i = 0;; i++) { 260 struct device_node *pipeline = of_parse_phandle(np, 261 "allwinner,pipelines", 262 i); 263 if (!pipeline) 264 break; 265 266 count += sun4i_drv_add_endpoints(&pdev->dev, &match, 267 pipeline); 268 of_node_put(pipeline); 269 270 DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n", 271 count, i); 272 } 273 274 if (count) 275 return component_master_add_with_match(&pdev->dev, 276 &sun4i_drv_master_ops, 277 match); 278 else 279 return 0; 280 } 281 282 static int sun4i_drv_remove(struct platform_device *pdev) 283 { 284 return 0; 285 } 286 287 static const struct of_device_id sun4i_drv_of_table[] = { 288 { .compatible = "allwinner,sun5i-a13-display-engine" }, 289 { .compatible = "allwinner,sun6i-a31-display-engine" }, 290 { .compatible = "allwinner,sun6i-a31s-display-engine" }, 291 { .compatible = "allwinner,sun8i-a33-display-engine" }, 292 { } 293 }; 294 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 295 296 static struct platform_driver sun4i_drv_platform_driver = { 297 .probe = sun4i_drv_probe, 298 .remove = sun4i_drv_remove, 299 .driver = { 300 .name = "sun4i-drm", 301 .of_match_table = sun4i_drv_of_table, 302 }, 303 }; 304 module_platform_driver(sun4i_drv_platform_driver); 305 306 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 307 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 308 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 309 MODULE_LICENSE("GPL"); 310