text: // SPDX-License-Identifier: GPL-2.0-only
  /*
   * Copyright (C) 2012 Russell King
   */
  
  #include <linux/clk.h>
  #include <linux/component.h>
  #include <linux/module.h>
  #include <linux/of_graph.h>
  #include <linux/platform_device.h>
  
  #include <drm/drm_atomic_helper.h>
  #include <drm/drm_drv.h>
  #include <drm/drm_ioctl.h>
  #include <drm/drm_managed.h>
  #include <drm/drm_prime.h>
  #include <drm/drm_probe_helper.h>
  #include <drm/drm_fb_helper.h>
  #include <drm/drm_of.h>
  #include <drm/drm_vblank.h>
  
  #include "armada_crtc.h"
  #include "armada_drm.h"
  #include "armada_gem.h"
  #include "armada_fb.h"
  #include "armada_hw.h"
  #include <drm/armada_drm.h>
  #include "armada_ioctlP.h"
  
  static const struct drm_ioctl_desc armada_ioctls[] = {
  	DRM_IOCTL_DEF_DRV(ARMADA_GEM_CREATE, armada_gem_create_ioctl,0),
  	DRM_IOCTL_DEF_DRV(ARMADA_GEM_MMAP, armada_gem_mmap_ioctl, 0),
  	DRM_IOCTL_DEF_DRV(ARMADA_GEM_PWRITE, armada_gem_pwrite_ioctl, 0),
  };
  
  DEFINE_DRM_GEM_FOPS(armada_drm_fops);
  
  static const struct drm_driver armada_drm_driver = {
  	.lastclose		= drm_fb_helper_lastclose,
  	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
  	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
  	.gem_prime_import	= armada_gem_prime_import,
  	.dumb_create		= armada_gem_dumb_create,
  	.major			= 1,
  	.minor			= 0,
  	.name			= "armada-drm",
  	.desc			= "Armada SoC DRM",
  	.date			= "20120730",
  	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
  	.ioctls			= armada_ioctls,
  	.num_ioctls = ARRAY_SIZE(armada_ioctls),
  	.fops			= &armada_drm_fops,
  };
  
  static const struct drm_mode_config_funcs armada_drm_mode_config_funcs = {
  	.fb_create		= armada_fb_create,
  	.output_poll_changed	= drm_fb_helper_output_poll_changed,
  	.atomic_check		= drm_atomic_helper_check,
  	.atomic_commit		= drm_atomic_helper_commit,
  };
  
  static int armada_drm_bind(struct device *dev)
  {
  	struct armada_private *priv;
  	struct resource *mem = NULL;
  	int ret, n;
  
  	for (n = 0; ; n++) {
  		struct resource *r = platform_get_resource(to_platform_device(dev),
  							   IORESOURCE_MEM, n);
  		if (!r)
  			break;
  
  		/* Resources above 64K are graphics memory */
  		if (resource_size(r) > SZ_64K)
  			mem = r;
  		else
  			return -EINVAL;
  	}
  
  	if (!mem)
  		return -ENXIO;
  
  	if (!devm_request_mem_region(dev, mem->start, resource_size(mem),
  				     "armada-drm"))
  		return -EBUSY;
  
  	priv = devm_drm_dev_alloc(dev, &armada_drm_driver,
  				  struct armada_private, drm);
  	if (IS_ERR(priv)) {
  		dev_err(dev, "[" DRM_NAME ":%s] devm_drm_dev_alloc failed: %li\n",
  			__func__, PTR_ERR(priv));
  		return PTR_ERR(priv);
  	}
  
  	/* Remove early framebuffers */
  	ret = drm_fb_helper_remove_conflicting_framebuffers(NULL,
  							    "armada-drm-fb",
  							    false);
  	if (ret) {
  		dev_err(dev, "[" DRM_NAME ":%s] can't kick out simple-fb: %d\n",
  			__func__, ret);
  		kfree(priv);
  		return ret;
  	}
  
  	dev_set_drvdata(dev, &priv->drm);
  
  	/* Mode setting support */
  	drm_mode_config_init(&priv->drm);
  	priv->drm.mode_config.min_width = 320;
  	priv->drm.mode_config.min_height = 200;
  
  	/*
  	 * With vscale enabled, the maximum width is 1920 due to the
  	 * 1920 by 3 lines RAM
  	 */
  	priv->drm.mode_config.max_width = 1920;
  	priv->drm.mode_config.max_height = 2048;
  
  	priv->drm.mode_config.preferred_depth = 24;
  	priv->drm.mode_config.funcs = &armada_drm_mode_config_funcs;
  	drm_mm_init(&priv->linear, mem->start, resource_size(mem));
  	mutex_init(&priv->linear_lock);
  
  	ret = component_bind_all(dev, &priv->drm);
  	if (ret)
  		goto err_kms;
  
  	ret = drm_vblank_init(&priv->drm, priv->drm.mode_config.num_crtc);
  	if (ret)
  		goto err_comp;
  
  	priv->drm.irq_enabled = true;
  
  	drm_mode_config_reset(&priv->drm);
  
  	ret = armada_fbdev_init(&priv->drm);
  	if (ret)
  		goto err_comp;
  
  	drm_kms_helper_poll_init(&priv->drm);
  
  	ret = drm_dev_register(&priv->drm, 0);
  	if (ret)
  		goto err_poll;
  
  #ifdef CONFIG_DEBUG_FS
  	armada_drm_debugfs_init(priv->drm.primary);
  #endif
  
  	return 0;
  
   err_poll:
  	drm_kms_helper_poll_fini(&priv->drm);
  	armada_fbdev_fini(&priv->drm);
   err_comp:
  	component_unbind_all(dev, &priv->drm);
   err_kms:
  	drm_mode_config_cleanup(&priv->drm);
  	drm_mm_takedown(&priv->linear);
  	return ret;
  }
  
  static void armada_drm_unbind(struct device *dev)
  {
  	struct drm_device *drm = dev_get_drvdata(dev);
  	struct armada_private *priv = drm_to_armada_dev(drm);
  
  	drm_kms_helper_poll_fini(&priv->drm);
  	armada_fbdev_fini(&priv->drm);
  
  	drm_dev_unregister(&priv->drm);
  
  	drm_atomic_helper_shutdown(&priv->drm);
  
  	component_unbind_all(dev, &priv->drm);
  
  	drm_mode_config_cleanup(&priv->drm);
  	drm_mm_takedown(&priv->linear);
  }
  
  static int compare_of(struct device *dev, void *data)
  {
  	return dev->of_node == data;
  }
  
  static int compare_dev_name(struct device *dev, void *data)
  {
  	const char *name = data;
  	return !strcmp(dev_name(dev), name);
  }
  
  static void armada_add_endpoints(struct device *dev,
  	struct component_match **match, struct device_node *dev_node)
  {
  	struct device_node *ep, *remote;
  
  	for_each_endpoint_of_node(dev_node, ep) {
  		remote = of_graph_get_remote_port_parent(ep);
  		if (remote && of_device_is_available(remote))
  			drm_of_component_match_add(dev, match, compare_of,
  						   remote);
  		of_node_put(remote);
  	}
  }
  
  static const struct component_master_ops armada_master_ops = {
  	.bind = armada_drm_bind,
  	.unbind = armada_drm_unbind,
  };
  
  static int armada_drm_probe(struct platform_device *pdev)
  {
  	struct component_match *match = NULL;
  	struct device *dev = &pdev->dev;
  	int ret;
  
  	ret = drm_of_component_probe(dev, compare_dev_name, &armada_master_ops);
  	if (ret != -EINVAL)
  		return ret;
  
  	if (dev->platform_data) {
  		char **devices = dev->platform_data;
  		struct device *d;
  		int i;
  
  		for (i = 0; devices[i]; i++)
  			component_match_add(dev, &match, compare_dev_name,
  					    devices[i]);
  
  		if (i == 0) {
  			dev_err(dev, "missing 'ports' property\n");
  			return -ENODEV;
  		}
  
  		for (i = 0; devices[i]; i++) {
  			d = bus_find_device_by_name(&platform_bus_type, NULL,
  						    devices[i]);
  			if (d && d->of_node)
  				armada_add_endpoints(dev, &match, d->of_node);
  			put_device(d);
  		}
  	}
  
  	return component_master_add_with_match(&pdev->dev, &armada_master_ops,
  					       match);
  }
  
  static int armada_drm_remove(struct platform_device *pdev)
  {
  	component_master_del(&pdev->dev, &armada_master_ops);
  	return 0;
  }
  
  static const struct platform_device_id armada_drm_platform_ids[] = {
  	{
  		.name		= "armada-drm",
  	}, {
  		.name		= "armada-510-drm",
  	},
  	{ },
  };
  MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
  
  static struct platform_driver armada_drm_platform_driver = {
  	.probe	= armada_drm_probe,
  	.remove	= armada_drm_remove,
  	.driver	= {
  		.name	= "armada-drm",
  	},
  	.id_table = armada_drm_platform_ids,
  };
  
  static int __init armada_drm_init(void)
  {
  	int ret;
  
  	ret = platform_driver_register(&armada_lcd_platform_driver);
  	if (ret)
  		return ret;
  	ret = platform_driver_register(&armada_drm_platform_driver);
  	if (ret)
  		platform_driver_unregister(&armada_lcd_platform_driver);
  	return ret;
  }
  module_init(armada_drm_init);
  
  static void __exit armada_drm_exit(void)
  {
  	platform_driver_unregister(&armada_drm_platform_driver);
  	platform_driver_unregister(&armada_lcd_platform_driver);
  }
  module_exit(armada_drm_exit);
  
  MODULE_AUTHOR("Russell King <rmk+kernel@armlinux.org.uk>");
  MODULE_DESCRIPTION("Armada DRM Driver");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("platform:armada-drm");
  