1 /* 2 * Copyright (C) 2012 Russell King 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 #include <linux/clk.h> 9 #include <linux/component.h> 10 #include <linux/module.h> 11 #include <linux/of_graph.h> 12 #include <drm/drm_crtc_helper.h> 13 #include <drm/drm_fb_helper.h> 14 #include <drm/drm_of.h> 15 #include "armada_crtc.h" 16 #include "armada_drm.h" 17 #include "armada_gem.h" 18 #include "armada_hw.h" 19 #include <drm/armada_drm.h> 20 #include "armada_ioctlP.h" 21 22 static void armada_drm_unref_work(struct work_struct *work) 23 { 24 struct armada_private *priv = 25 container_of(work, struct armada_private, fb_unref_work); 26 struct drm_framebuffer *fb; 27 28 while (kfifo_get(&priv->fb_unref, &fb)) 29 drm_framebuffer_put(fb); 30 } 31 32 /* Must be called with dev->event_lock held */ 33 void __armada_drm_queue_unref_work(struct drm_device *dev, 34 struct drm_framebuffer *fb) 35 { 36 struct armada_private *priv = dev->dev_private; 37 38 WARN_ON(!kfifo_put(&priv->fb_unref, fb)); 39 schedule_work(&priv->fb_unref_work); 40 } 41 42 void armada_drm_queue_unref_work(struct drm_device *dev, 43 struct drm_framebuffer *fb) 44 { 45 unsigned long flags; 46 47 spin_lock_irqsave(&dev->event_lock, flags); 48 __armada_drm_queue_unref_work(dev, fb); 49 spin_unlock_irqrestore(&dev->event_lock, flags); 50 } 51 52 static struct drm_ioctl_desc armada_ioctls[] = { 53 DRM_IOCTL_DEF_DRV(ARMADA_GEM_CREATE, armada_gem_create_ioctl,0), 54 DRM_IOCTL_DEF_DRV(ARMADA_GEM_MMAP, armada_gem_mmap_ioctl, 0), 55 DRM_IOCTL_DEF_DRV(ARMADA_GEM_PWRITE, armada_gem_pwrite_ioctl, 0), 56 }; 57 58 DEFINE_DRM_GEM_FOPS(armada_drm_fops); 59 60 static struct drm_driver armada_drm_driver = { 61 .lastclose = drm_fb_helper_lastclose, 62 .gem_free_object_unlocked = armada_gem_free_object, 63 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 64 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 65 .gem_prime_export = armada_gem_prime_export, 66 .gem_prime_import = armada_gem_prime_import, 67 .dumb_create = armada_gem_dumb_create, 68 .gem_vm_ops = &armada_gem_vm_ops, 69 .major = 1, 70 .minor = 0, 71 .name = "armada-drm", 72 .desc = "Armada SoC DRM", 73 .date = "20120730", 74 .driver_features = DRIVER_GEM | DRIVER_MODESET | 75 DRIVER_PRIME, 76 .ioctls = armada_ioctls, 77 .fops = &armada_drm_fops, 78 }; 79 80 static int armada_drm_bind(struct device *dev) 81 { 82 struct armada_private *priv; 83 struct resource *mem = NULL; 84 int ret, n; 85 86 for (n = 0; ; n++) { 87 struct resource *r = platform_get_resource(to_platform_device(dev), 88 IORESOURCE_MEM, n); 89 if (!r) 90 break; 91 92 /* Resources above 64K are graphics memory */ 93 if (resource_size(r) > SZ_64K) 94 mem = r; 95 else 96 return -EINVAL; 97 } 98 99 if (!mem) 100 return -ENXIO; 101 102 if (!devm_request_mem_region(dev, mem->start, resource_size(mem), 103 "armada-drm")) 104 return -EBUSY; 105 106 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 107 if (!priv) 108 return -ENOMEM; 109 110 /* 111 * The drm_device structure must be at the start of 112 * armada_private for drm_dev_unref() to work correctly. 113 */ 114 BUILD_BUG_ON(offsetof(struct armada_private, drm) != 0); 115 116 ret = drm_dev_init(&priv->drm, &armada_drm_driver, dev); 117 if (ret) { 118 dev_err(dev, "[" DRM_NAME ":%s] drm_dev_init failed: %d\n", 119 __func__, ret); 120 kfree(priv); 121 return ret; 122 } 123 124 priv->drm.dev_private = priv; 125 126 dev_set_drvdata(dev, &priv->drm); 127 128 INIT_WORK(&priv->fb_unref_work, armada_drm_unref_work); 129 INIT_KFIFO(priv->fb_unref); 130 131 /* Mode setting support */ 132 drm_mode_config_init(&priv->drm); 133 priv->drm.mode_config.min_width = 320; 134 priv->drm.mode_config.min_height = 200; 135 136 /* 137 * With vscale enabled, the maximum width is 1920 due to the 138 * 1920 by 3 lines RAM 139 */ 140 priv->drm.mode_config.max_width = 1920; 141 priv->drm.mode_config.max_height = 2048; 142 143 priv->drm.mode_config.preferred_depth = 24; 144 priv->drm.mode_config.funcs = &armada_drm_mode_config_funcs; 145 drm_mm_init(&priv->linear, mem->start, resource_size(mem)); 146 mutex_init(&priv->linear_lock); 147 148 ret = component_bind_all(dev, &priv->drm); 149 if (ret) 150 goto err_kms; 151 152 ret = drm_vblank_init(&priv->drm, priv->drm.mode_config.num_crtc); 153 if (ret) 154 goto err_comp; 155 156 priv->drm.irq_enabled = true; 157 158 ret = armada_fbdev_init(&priv->drm); 159 if (ret) 160 goto err_comp; 161 162 drm_kms_helper_poll_init(&priv->drm); 163 164 ret = drm_dev_register(&priv->drm, 0); 165 if (ret) 166 goto err_poll; 167 168 #ifdef CONFIG_DEBUG_FS 169 armada_drm_debugfs_init(priv->drm.primary); 170 #endif 171 172 return 0; 173 174 err_poll: 175 drm_kms_helper_poll_fini(&priv->drm); 176 armada_fbdev_fini(&priv->drm); 177 err_comp: 178 component_unbind_all(dev, &priv->drm); 179 err_kms: 180 drm_mode_config_cleanup(&priv->drm); 181 drm_mm_takedown(&priv->linear); 182 flush_work(&priv->fb_unref_work); 183 drm_dev_unref(&priv->drm); 184 return ret; 185 } 186 187 static void armada_drm_unbind(struct device *dev) 188 { 189 struct drm_device *drm = dev_get_drvdata(dev); 190 struct armada_private *priv = drm->dev_private; 191 192 drm_kms_helper_poll_fini(&priv->drm); 193 armada_fbdev_fini(&priv->drm); 194 195 drm_dev_unregister(&priv->drm); 196 197 component_unbind_all(dev, &priv->drm); 198 199 drm_mode_config_cleanup(&priv->drm); 200 drm_mm_takedown(&priv->linear); 201 flush_work(&priv->fb_unref_work); 202 203 drm_dev_unref(&priv->drm); 204 } 205 206 static int compare_of(struct device *dev, void *data) 207 { 208 return dev->of_node == data; 209 } 210 211 static int compare_dev_name(struct device *dev, void *data) 212 { 213 const char *name = data; 214 return !strcmp(dev_name(dev), name); 215 } 216 217 static void armada_add_endpoints(struct device *dev, 218 struct component_match **match, struct device_node *port) 219 { 220 struct device_node *ep, *remote; 221 222 for_each_child_of_node(port, ep) { 223 remote = of_graph_get_remote_port_parent(ep); 224 if (!remote || !of_device_is_available(remote)) { 225 of_node_put(remote); 226 continue; 227 } else if (!of_device_is_available(remote->parent)) { 228 dev_warn(dev, "parent device of %pOF is not available\n", 229 remote); 230 of_node_put(remote); 231 continue; 232 } 233 234 drm_of_component_match_add(dev, match, compare_of, remote); 235 of_node_put(remote); 236 } 237 } 238 239 static const struct component_master_ops armada_master_ops = { 240 .bind = armada_drm_bind, 241 .unbind = armada_drm_unbind, 242 }; 243 244 static int armada_drm_probe(struct platform_device *pdev) 245 { 246 struct component_match *match = NULL; 247 struct device *dev = &pdev->dev; 248 int ret; 249 250 ret = drm_of_component_probe(dev, compare_dev_name, &armada_master_ops); 251 if (ret != -EINVAL) 252 return ret; 253 254 if (dev->platform_data) { 255 char **devices = dev->platform_data; 256 struct device_node *port; 257 struct device *d; 258 int i; 259 260 for (i = 0; devices[i]; i++) 261 component_match_add(dev, &match, compare_dev_name, 262 devices[i]); 263 264 if (i == 0) { 265 dev_err(dev, "missing 'ports' property\n"); 266 return -ENODEV; 267 } 268 269 for (i = 0; devices[i]; i++) { 270 d = bus_find_device_by_name(&platform_bus_type, NULL, 271 devices[i]); 272 if (d && d->of_node) { 273 for_each_child_of_node(d->of_node, port) 274 armada_add_endpoints(dev, &match, port); 275 } 276 put_device(d); 277 } 278 } 279 280 return component_master_add_with_match(&pdev->dev, &armada_master_ops, 281 match); 282 } 283 284 static int armada_drm_remove(struct platform_device *pdev) 285 { 286 component_master_del(&pdev->dev, &armada_master_ops); 287 return 0; 288 } 289 290 static const struct platform_device_id armada_drm_platform_ids[] = { 291 { 292 .name = "armada-drm", 293 }, { 294 .name = "armada-510-drm", 295 }, 296 { }, 297 }; 298 MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids); 299 300 static struct platform_driver armada_drm_platform_driver = { 301 .probe = armada_drm_probe, 302 .remove = armada_drm_remove, 303 .driver = { 304 .name = "armada-drm", 305 }, 306 .id_table = armada_drm_platform_ids, 307 }; 308 309 static int __init armada_drm_init(void) 310 { 311 int ret; 312 313 armada_drm_driver.num_ioctls = ARRAY_SIZE(armada_ioctls); 314 315 ret = platform_driver_register(&armada_lcd_platform_driver); 316 if (ret) 317 return ret; 318 ret = platform_driver_register(&armada_drm_platform_driver); 319 if (ret) 320 platform_driver_unregister(&armada_lcd_platform_driver); 321 return ret; 322 } 323 module_init(armada_drm_init); 324 325 static void __exit armada_drm_exit(void) 326 { 327 platform_driver_unregister(&armada_drm_platform_driver); 328 platform_driver_unregister(&armada_lcd_platform_driver); 329 } 330 module_exit(armada_drm_exit); 331 332 MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>"); 333 MODULE_DESCRIPTION("Armada DRM Driver"); 334 MODULE_LICENSE("GPL"); 335 MODULE_ALIAS("platform:armada-drm"); 336