[mirror_ubuntu-eoan-kernel.git] / drivers / gpu / drm / sun4i / sun4i_drv.c

/*
 * Copyright (C) 2015 Free Electrons
 * Copyright (C) 2015 NextThing Co
 *
 * Maxime Ripard <maxime.ripard@free-electrons.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 */

#include <linux/component.h>
#include <linux/kfifo.h>
#include <linux/of_graph.h>
#include <linux/of_reserved_mem.h>

#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_of.h>

#include "sun4i_drv.h"
#include "sun4i_framebuffer.h"
#include "sun4i_tcon.h"

DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops);

static struct drm_driver sun4i_drv_driver = {
	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,

	/* Generic Operations */
	.lastclose		= drm_fb_helper_lastclose,
	.fops			= &sun4i_drv_fops,
	.name			= "sun4i-drm",
	.desc			= "Allwinner sun4i Display Engine",
	.date			= "20150629",
	.major			= 1,
	.minor			= 0,

	/* GEM Operations */
	.dumb_create		= drm_gem_cma_dumb_create,
	.gem_free_object_unlocked = drm_gem_cma_free_object,
	.gem_vm_ops		= &drm_gem_cma_vm_ops,

	/* PRIME Operations */
	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
	.gem_prime_import	= drm_gem_prime_import,
	.gem_prime_export	= drm_gem_prime_export,
	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
	.gem_prime_mmap		= drm_gem_cma_prime_mmap,

	/* Frame Buffer Operations */
};

static void sun4i_remove_framebuffers(void)
{
	struct apertures_struct *ap;

	ap = alloc_apertures(1);
	if (!ap)
		return;

	/* The framebuffer can be located anywhere in RAM */
	ap->ranges[0].base = 0;
	ap->ranges[0].size = ~0;

	drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false);
	kfree(ap);
}

static int sun4i_drv_bind(struct device *dev)
{
	struct drm_device *drm;
	struct sun4i_drv *drv;
	int ret;

	drm = drm_dev_alloc(&sun4i_drv_driver, dev);
	if (IS_ERR(drm))
		return PTR_ERR(drm);

	drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
	if (!drv) {
		ret = -ENOMEM;
		goto free_drm;
	}
	drm->dev_private = drv;
	INIT_LIST_HEAD(&drv->engine_list);
	INIT_LIST_HEAD(&drv->tcon_list);

	ret = of_reserved_mem_device_init(dev);
	if (ret && ret != -ENODEV) {
		dev_err(drm->dev, "Couldn't claim our memory region\n");
		goto free_drm;
	}

	drm_mode_config_init(drm);

	ret = component_bind_all(drm->dev, drm);
	if (ret) {
		dev_err(drm->dev, "Couldn't bind all pipelines components\n");
		goto cleanup_mode_config;
	}

	/* drm_vblank_init calls kcalloc, which can fail */
	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
	if (ret)
		goto cleanup_mode_config;

	drm->irq_enabled = true;

	/* Remove early framebuffers (ie. simplefb) */
	sun4i_remove_framebuffers();

	/* Create our framebuffer */
	ret = sun4i_framebuffer_init(drm);
	if (ret) {
		dev_err(drm->dev, "Couldn't create our framebuffer\n");
		goto cleanup_mode_config;
	}

	/* Enable connectors polling */
	drm_kms_helper_poll_init(drm);

	ret = drm_dev_register(drm, 0);
	if (ret)
		goto finish_poll;

	return 0;

finish_poll:
	drm_kms_helper_poll_fini(drm);
	sun4i_framebuffer_free(drm);
cleanup_mode_config:
	drm_mode_config_cleanup(drm);
	of_reserved_mem_device_release(dev);
free_drm:
	drm_dev_unref(drm);
	return ret;
}

static void sun4i_drv_unbind(struct device *dev)
{
	struct drm_device *drm = dev_get_drvdata(dev);

	drm_dev_unregister(drm);
	drm_kms_helper_poll_fini(drm);
	sun4i_framebuffer_free(drm);
	drm_mode_config_cleanup(drm);
	of_reserved_mem_device_release(dev);
	drm_dev_unref(drm);
}

static const struct component_master_ops sun4i_drv_master_ops = {
	.bind	= sun4i_drv_bind,
	.unbind	= sun4i_drv_unbind,
};

static bool sun4i_drv_node_is_connector(struct device_node *node)
{
	return of_device_is_compatible(node, "hdmi-connector");
}

static bool sun4i_drv_node_is_frontend(struct device_node *node)
{
	return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
		of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
		of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
		of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
		of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend");
}

static bool sun4i_drv_node_is_tcon(struct device_node *node)
{
	return !!of_match_node(sun4i_tcon_of_table, node);
}

static int compare_of(struct device *dev, void *data)
{
	DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
			 dev->of_node,
			 data);

	return dev->of_node == data;
}

/*
 * The encoder drivers use drm_of_find_possible_crtcs to get upstream
 * crtcs from the device tree using of_graph. For the results to be
 * correct, encoders must be probed/bound after _all_ crtcs have been
 * created. The existing code uses a depth first recursive traversal
 * of the of_graph, which means the encoders downstream of the TCON
 * get add right after the first TCON. The second TCON or CRTC will
 * never be properly associated with encoders connected to it.
 *
 * Also, in a dual display pipeline setup, both frontends can feed
 * either backend, and both backends can feed either TCON, we want
 * all components of the same type to be added before the next type
 * in the pipeline. Fortunately, the pipelines are perfectly symmetric,
 * i.e. components of the same type are at the same depth when counted
 * from the frontend. The only exception is the third pipeline in
 * the A80 SoC, which we do not support anyway.
 *
 * Hence we can use a breadth first search traversal order to add
 * components. We do not need to check for duplicates. The component
 * matching system handles this for us.
 */
struct endpoint_list {
	DECLARE_KFIFO(fifo, struct device_node *, 16);
};

static int sun4i_drv_add_endpoints(struct device *dev,
				   struct endpoint_list *list,
				   struct component_match **match,
				   struct device_node *node)
{
	struct device_node *port, *ep, *remote;
	int count = 0;

	/*
	 * We don't support the frontend for now, so we will never
	 * have a device bound. Just skip over it, but we still want
	 * the rest our pipeline to be added.
	 */
	if (!sun4i_drv_node_is_frontend(node) &&
	    !of_device_is_available(node))
		return 0;

	/*
	 * The connectors will be the last nodes in our pipeline, we
	 * can just bail out.
	 */
	if (sun4i_drv_node_is_connector(node))
		return 0;

	if (!sun4i_drv_node_is_frontend(node)) {
		/* Add current component */
		DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
		drm_of_component_match_add(dev, match, compare_of, node);
		count++;
	}

	/* Inputs are listed first, then outputs */
	port = of_graph_get_port_by_id(node, 1);
	if (!port) {
		DRM_DEBUG_DRIVER("No output to bind\n");
		return count;
	}

	for_each_available_child_of_node(port, ep) {
		remote = of_graph_get_remote_port_parent(ep);
		if (!remote) {
			DRM_DEBUG_DRIVER("Error retrieving the output node\n");
			of_node_put(remote);
			continue;
		}

		/*
		 * If the node is our TCON, the first port is used for
		 * panel or bridges, and will not be part of the
		 * component framework.
		 */
		if (sun4i_drv_node_is_tcon(node)) {
			struct of_endpoint endpoint;

			if (of_graph_parse_endpoint(ep, &endpoint)) {
				DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
				continue;
			}

			if (!endpoint.id) {
				DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
				continue;
			}
		}

		kfifo_put(&list->fifo, remote);
	}

	return count;
}

static int sun4i_drv_probe(struct platform_device *pdev)
{
	struct component_match *match = NULL;
	struct device_node *np = pdev->dev.of_node, *endpoint;
	struct endpoint_list list;
	int i, ret, count = 0;

	INIT_KFIFO(list.fifo);

	for (i = 0;; i++) {
		struct device_node *pipeline = of_parse_phandle(np,
								"allwinner,pipelines",
								i);
		if (!pipeline)
			break;

		kfifo_put(&list.fifo, pipeline);
	}

	while (kfifo_get(&list.fifo, &endpoint)) {
		/* process this endpoint */
		ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
					      endpoint);

		/* sun4i_drv_add_endpoints can fail to allocate memory */
		if (ret < 0)
			return ret;

		count += ret;
	}

	if (count)
		return component_master_add_with_match(&pdev->dev,
						       &sun4i_drv_master_ops,
						       match);
	else
		return 0;
}

static int sun4i_drv_remove(struct platform_device *pdev)
{
	return 0;
}

static const struct of_device_id sun4i_drv_of_table[] = {
	{ .compatible = "allwinner,sun4i-a10-display-engine" },
	{ .compatible = "allwinner,sun5i-a10s-display-engine" },
	{ .compatible = "allwinner,sun5i-a13-display-engine" },
	{ .compatible = "allwinner,sun6i-a31-display-engine" },
	{ .compatible = "allwinner,sun6i-a31s-display-engine" },
	{ .compatible = "allwinner,sun7i-a20-display-engine" },
	{ .compatible = "allwinner,sun8i-a33-display-engine" },
	{ .compatible = "allwinner,sun8i-a83t-display-engine" },
	{ .compatible = "allwinner,sun8i-v3s-display-engine" },
	{ }
};
MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);

static struct platform_driver sun4i_drv_platform_driver = {
	.probe		= sun4i_drv_probe,
	.remove		= sun4i_drv_remove,
	.driver		= {
		.name		= "sun4i-drm",
		.of_match_table	= sun4i_drv_of_table,
	},
};
module_platform_driver(sun4i_drv_platform_driver);

MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
9026e0d1 MR	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>
8b11aafa	14	#include <linux/kfifo.h>
9026e0d1	15	#include <linux/of_graph.h>
596afb6f	16	#include <linux/of_reserved_mem.h>
9026e0d1 MR	17
	18	#include <drm/drmP.h>
	19	#include <drm/drm_crtc_helper.h>
	20	#include <drm/drm_fb_cma_helper.h>
	21	#include <drm/drm_gem_cma_helper.h>
44adece5	22	#include <drm/drm_fb_helper.h>
97ac0e47	23	#include <drm/drm_of.h>
9026e0d1	24
9026e0d1 MR	25	#include "sun4i_drv.h"
9026e0d1 MR	26	#include "sun4i_framebuffer.h"
b3f266e4	27	#include "sun4i_tcon.h"
9026e0d1	28
d55f7e5d	29	DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops);
9026e0d1 MR	30
	31	static struct drm_driver sun4i_drv_driver = {
	32	.driver_features = DRIVER_GEM \| DRIVER_MODESET \| DRIVER_PRIME \| DRIVER_ATOMIC,
	33
	34	/* Generic Operations */
22efc85b	35	.lastclose = drm_fb_helper_lastclose,
9026e0d1 MR	36	.fops = &sun4i_drv_fops,
	37	.name = "sun4i-drm",
	38	.desc = "Allwinner sun4i Display Engine",
	39	.date = "20150629",
	40	.major = 1,
	41	.minor = 0,
	42
	43	/* GEM Operations */
	44	.dumb_create = drm_gem_cma_dumb_create,
ae2c6221	45	.gem_free_object_unlocked = drm_gem_cma_free_object,
9026e0d1 MR	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 */
9026e0d1 MR	60	};
9026e0d1 MR	61
3d6bd906 MR	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
44adece5	74	drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false);
3d6bd906 MR	75	kfree(ap);
	76	}
	77
9026e0d1 MR	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);
0f288605 TG	85	if (IS_ERR(drm))
0f288605 TG	86	return PTR_ERR(drm);
9026e0d1	87
9026e0d1 MR	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;
87969338	94	INIT_LIST_HEAD(&drv->engine_list);
80a58240	95	INIT_LIST_HEAD(&drv->tcon_list);
9026e0d1	96
596afb6f MR	97	ret = of_reserved_mem_device_init(dev);
	98	if (ret && ret != -ENODEV) {
	99	dev_err(drm->dev, "Couldn't claim our memory region\n");
	100	goto free_drm;
	101	}
	102
9026e0d1 MR	103	drm_mode_config_init(drm);
	104
	105	ret = component_bind_all(drm->dev, drm);
	106	if (ret) {
	107	dev_err(drm->dev, "Couldn't bind all pipelines components\n");
9d56defb	108	goto cleanup_mode_config;
9026e0d1 MR	109	}
9026e0d1 MR	110
070badfa CYT	111	/* drm_vblank_init calls kcalloc, which can fail */
	112	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
	113	if (ret)
9ca86149	114	goto cleanup_mode_config;
070badfa	115
9026e0d1 MR	116	drm->irq_enabled = true;
9026e0d1 MR	117
3d6bd906 MR	118	/* Remove early framebuffers (ie. simplefb) */
	119	sun4i_remove_framebuffers();
	120
9026e0d1	121	/* Create our framebuffer */
22efc85b NT	122	ret = sun4i_framebuffer_init(drm);
22efc85b NT	123	if (ret) {
9026e0d1	124	dev_err(drm->dev, "Couldn't create our framebuffer\n");
9d56defb	125	goto cleanup_mode_config;
9026e0d1 MR	126	}
	127
	128	/* Enable connectors polling */
	129	drm_kms_helper_poll_init(drm);
	130
	131	ret = drm_dev_register(drm, 0);
	132	if (ret)
9d56defb	133	goto finish_poll;
9026e0d1	134
9026e0d1 MR	135	return 0;
9026e0d1 MR	136
9d56defb CYT	137	finish_poll:
	138	drm_kms_helper_poll_fini(drm);
	139	sun4i_framebuffer_free(drm);
	140	cleanup_mode_config:
	141	drm_mode_config_cleanup(drm);
596afb6f	142	of_reserved_mem_device_release(dev);
9026e0d1 MR	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);
92caf9be	155	drm_mode_config_cleanup(drm);
596afb6f	156	of_reserved_mem_device_release(dev);
9026e0d1 MR	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
49baeb07 MR	165	static bool sun4i_drv_node_is_connector(struct device_node *node)
	166	{
	167	return of_device_is_compatible(node, "hdmi-connector");
	168	}
	169
9026e0d1 MR	170	static bool sun4i_drv_node_is_frontend(struct device_node *node)
9026e0d1 MR	171	{
9a8187c0 CYT	172	return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") \|\|
9a8187c0 CYT	173	of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") \|\|
49c440e8	174	of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") \|\|
aaddb6d2	175	of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") \|\|
4a408f1f	176	of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend");
9026e0d1 MR	177	}
9026e0d1 MR	178
29e57fab MR	179	static bool sun4i_drv_node_is_tcon(struct device_node *node)
29e57fab MR	180	{
ff71c2cf	181	return !!of_match_node(sun4i_tcon_of_table, node);
29e57fab MR	182	}
29e57fab MR	183
9026e0d1 MR	184	static int compare_of(struct device dev, void data)
9026e0d1 MR	185	{
4bf99144 RH	186	DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
	187	dev->of_node,
	188	data);
9026e0d1 MR	189
	190	return dev->of_node == data;
	191	}
	192
da82b878 CYT	193	/*
	194	* The encoder drivers use drm_of_find_possible_crtcs to get upstream
	195	* crtcs from the device tree using of_graph. For the results to be
	196	* correct, encoders must be probed/bound after _all_ crtcs have been
	197	* created. The existing code uses a depth first recursive traversal
	198	* of the of_graph, which means the encoders downstream of the TCON
	199	* get add right after the first TCON. The second TCON or CRTC will
	200	* never be properly associated with encoders connected to it.
	201	*
	202	* Also, in a dual display pipeline setup, both frontends can feed
	203	* either backend, and both backends can feed either TCON, we want
	204	* all components of the same type to be added before the next type
	205	* in the pipeline. Fortunately, the pipelines are perfectly symmetric,
	206	* i.e. components of the same type are at the same depth when counted
	207	* from the frontend. The only exception is the third pipeline in
	208	* the A80 SoC, which we do not support anyway.
	209	*
	210	* Hence we can use a breadth first search traversal order to add
	211	* components. We do not need to check for duplicates. The component
	212	* matching system handles this for us.
	213	*/
	214	struct endpoint_list {
8b11aafa	215	DECLARE_KFIFO(fifo, struct device_node *, 16);
da82b878 CYT	216	};
da82b878 CYT	217
9026e0d1	218	static int sun4i_drv_add_endpoints(struct device *dev,
8b11aafa	219	struct endpoint_list *list,
9026e0d1 MR	220	struct component_match **match,
	221	struct device_node *node)
	222	{
	223	struct device_node port, ep, *remote;
	224	int count = 0;
	225
	226	/*
	227	* We don't support the frontend for now, so we will never
	228	* have a device bound. Just skip over it, but we still want
	229	* the rest our pipeline to be added.
	230	*/
	231	if (!sun4i_drv_node_is_frontend(node) &&
	232	!of_device_is_available(node))
	233	return 0;
	234
49baeb07 MR	235	/*
	236	* The connectors will be the last nodes in our pipeline, we
	237	* can just bail out.
	238	*/
	239	if (sun4i_drv_node_is_connector(node))
	240	return 0;
	241
9026e0d1 MR	242	if (!sun4i_drv_node_is_frontend(node)) {
9026e0d1 MR	243	/* Add current component */
4bf99144	244	DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
97ac0e47	245	drm_of_component_match_add(dev, match, compare_of, node);
9026e0d1 MR	246	count++;
	247	}
	248
	249	/* Inputs are listed first, then outputs */
	250	port = of_graph_get_port_by_id(node, 1);
	251	if (!port) {
	252	DRM_DEBUG_DRIVER("No output to bind\n");
	253	return count;
	254	}
	255
	256	for_each_available_child_of_node(port, ep) {
	257	remote = of_graph_get_remote_port_parent(ep);
	258	if (!remote) {
	259	DRM_DEBUG_DRIVER("Error retrieving the output node\n");
	260	of_node_put(remote);
	261	continue;
	262	}
	263
29e57fab	264	/*
894f5a9f MR	265	* If the node is our TCON, the first port is used for
894f5a9f MR	266	* panel or bridges, and will not be part of the
29e57fab MR	267	* component framework.
	268	*/
	269	if (sun4i_drv_node_is_tcon(node)) {
	270	struct of_endpoint endpoint;
	271
	272	if (of_graph_parse_endpoint(ep, &endpoint)) {
	273	DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
	274	continue;
	275	}
	276
	277	if (!endpoint.id) {
	278	DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
	279	continue;
	280	}
	281	}
	282
8b11aafa	283	kfifo_put(&list->fifo, remote);
9026e0d1 MR	284	}
	285
	286	return count;
	287	}
	288
	289	static int sun4i_drv_probe(struct platform_device *pdev)
	290	{
	291	struct component_match *match = NULL;
8b11aafa MR	292	struct device_node np = pdev->dev.of_node, endpoint;
8b11aafa MR	293	struct endpoint_list list;
da82b878	294	int i, ret, count = 0;
8b11aafa MR	295
8b11aafa MR	296	INIT_KFIFO(list.fifo);
9026e0d1 MR	297
	298	for (i = 0;; i++) {
	299	struct device_node *pipeline = of_parse_phandle(np,
	300	"allwinner,pipelines",
	301	i);
	302	if (!pipeline)
	303	break;
	304
8b11aafa	305	kfifo_put(&list.fifo, pipeline);
da82b878 CYT	306	}
da82b878 CYT	307
8b11aafa	308	while (kfifo_get(&list.fifo, &endpoint)) {
da82b878	309	/* process this endpoint */
8b11aafa MR	310	ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
8b11aafa MR	311	endpoint);
da82b878 CYT	312
	313	/* sun4i_drv_add_endpoints can fail to allocate memory */
	314	if (ret < 0)
8b11aafa	315	return ret;
da82b878 CYT	316
da82b878 CYT	317	count += ret;
9026e0d1 MR	318	}
	319
	320	if (count)
	321	return component_master_add_with_match(&pdev->dev,
	322	&sun4i_drv_master_ops,
	323	match);
	324	else
	325	return 0;
	326	}
	327
	328	static int sun4i_drv_remove(struct platform_device *pdev)
	329	{
	330	return 0;
	331	}
	332
	333	static const struct of_device_id sun4i_drv_of_table[] = {
9a8187c0	334	{ .compatible = "allwinner,sun4i-a10-display-engine" },
110d33dd	335	{ .compatible = "allwinner,sun5i-a10s-display-engine" },
9026e0d1	336	{ .compatible = "allwinner,sun5i-a13-display-engine" },
49c440e8 CYT	337	{ .compatible = "allwinner,sun6i-a31-display-engine" },
49c440e8 CYT	338	{ .compatible = "allwinner,sun6i-a31s-display-engine" },
aaddb6d2	339	{ .compatible = "allwinner,sun7i-a20-display-engine" },
4a408f1f	340	{ .compatible = "allwinner,sun8i-a33-display-engine" },
2f0d7bb1	341	{ .compatible = "allwinner,sun8i-a83t-display-engine" },
9df90c25	342	{ .compatible = "allwinner,sun8i-v3s-display-engine" },
9026e0d1 MR	343	{ }
	344	};
	345	MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
	346
	347	static struct platform_driver sun4i_drv_platform_driver = {
	348	.probe = sun4i_drv_probe,
	349	.remove = sun4i_drv_remove,
	350	.driver = {
	351	.name = "sun4i-drm",
	352	.of_match_table = sun4i_drv_of_table,
	353	},
	354	};
	355	module_platform_driver(sun4i_drv_platform_driver);
	356
	357	MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
	358	MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
	359	MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
	360	MODULE_LICENSE("GPL");