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 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 drm_vblank_cleanup(drm); 142 free_mem_region: 143 of_reserved_mem_device_release(dev); 144 free_drm: 145 drm_dev_unref(drm); 146 return ret; 147 } 148 149 static void sun4i_drv_unbind(struct device *dev) 150 { 151 struct drm_device *drm = dev_get_drvdata(dev); 152 153 drm_dev_unregister(drm); 154 drm_kms_helper_poll_fini(drm); 155 sun4i_framebuffer_free(drm); 156 drm_mode_config_cleanup(drm); 157 drm_vblank_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_frontend(struct device_node *node) 168 { 169 return of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") || 170 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") || 171 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend"); 172 } 173 174 static bool sun4i_drv_node_is_tcon(struct device_node *node) 175 { 176 return of_device_is_compatible(node, "allwinner,sun5i-a13-tcon") || 177 of_device_is_compatible(node, "allwinner,sun6i-a31-tcon") || 178 of_device_is_compatible(node, "allwinner,sun6i-a31s-tcon") || 179 of_device_is_compatible(node, "allwinner,sun8i-a33-tcon"); 180 } 181 182 static int compare_of(struct device *dev, void *data) 183 { 184 DRM_DEBUG_DRIVER("Comparing of node %s with %s\n", 185 of_node_full_name(dev->of_node), 186 of_node_full_name(data)); 187 188 return dev->of_node == data; 189 } 190 191 static int sun4i_drv_add_endpoints(struct device *dev, 192 struct component_match **match, 193 struct device_node *node) 194 { 195 struct device_node *port, *ep, *remote; 196 int count = 0; 197 198 /* 199 * We don't support the frontend for now, so we will never 200 * have a device bound. Just skip over it, but we still want 201 * the rest our pipeline to be added. 202 */ 203 if (!sun4i_drv_node_is_frontend(node) && 204 !of_device_is_available(node)) 205 return 0; 206 207 if (!sun4i_drv_node_is_frontend(node)) { 208 /* Add current component */ 209 DRM_DEBUG_DRIVER("Adding component %s\n", 210 of_node_full_name(node)); 211 drm_of_component_match_add(dev, match, compare_of, node); 212 count++; 213 } 214 215 /* Inputs are listed first, then outputs */ 216 port = of_graph_get_port_by_id(node, 1); 217 if (!port) { 218 DRM_DEBUG_DRIVER("No output to bind\n"); 219 return count; 220 } 221 222 for_each_available_child_of_node(port, ep) { 223 remote = of_graph_get_remote_port_parent(ep); 224 if (!remote) { 225 DRM_DEBUG_DRIVER("Error retrieving the output node\n"); 226 of_node_put(remote); 227 continue; 228 } 229 230 /* 231 * If the node is our TCON, the first port is used for 232 * panel or bridges, and will not be part of the 233 * component framework. 234 */ 235 if (sun4i_drv_node_is_tcon(node)) { 236 struct of_endpoint endpoint; 237 238 if (of_graph_parse_endpoint(ep, &endpoint)) { 239 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); 240 continue; 241 } 242 243 if (!endpoint.id) { 244 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); 245 continue; 246 } 247 } 248 249 /* Walk down our tree */ 250 count += sun4i_drv_add_endpoints(dev, match, remote); 251 252 of_node_put(remote); 253 } 254 255 return count; 256 } 257 258 static int sun4i_drv_probe(struct platform_device *pdev) 259 { 260 struct component_match *match = NULL; 261 struct device_node *np = pdev->dev.of_node; 262 int i, count = 0; 263 264 for (i = 0;; i++) { 265 struct device_node *pipeline = of_parse_phandle(np, 266 "allwinner,pipelines", 267 i); 268 if (!pipeline) 269 break; 270 271 count += sun4i_drv_add_endpoints(&pdev->dev, &match, 272 pipeline); 273 of_node_put(pipeline); 274 275 DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n", 276 count, i); 277 } 278 279 if (count) 280 return component_master_add_with_match(&pdev->dev, 281 &sun4i_drv_master_ops, 282 match); 283 else 284 return 0; 285 } 286 287 static int sun4i_drv_remove(struct platform_device *pdev) 288 { 289 return 0; 290 } 291 292 static const struct of_device_id sun4i_drv_of_table[] = { 293 { .compatible = "allwinner,sun5i-a13-display-engine" }, 294 { .compatible = "allwinner,sun6i-a31-display-engine" }, 295 { .compatible = "allwinner,sun6i-a31s-display-engine" }, 296 { .compatible = "allwinner,sun8i-a33-display-engine" }, 297 { } 298 }; 299 MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); 300 301 static struct platform_driver sun4i_drv_platform_driver = { 302 .probe = sun4i_drv_probe, 303 .remove = sun4i_drv_remove, 304 .driver = { 305 .name = "sun4i-drm", 306 .of_match_table = sun4i_drv_of_table, 307 }, 308 }; 309 module_platform_driver(sun4i_drv_platform_driver); 310 311 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); 312 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 313 MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); 314 MODULE_LICENSE("GPL"); 315