1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2012 Russell King
  4 */
  5
  6#include <linux/clk.h>
  7#include <linux/component.h>
  8#include <linux/module.h>
  9#include <linux/of_graph.h>
 10#include <linux/platform_device.h>
 11
 12#include <drm/drm_atomic_helper.h>
 13#include <drm/drm_drv.h>
 14#include <drm/drm_ioctl.h>
 15#include <drm/drm_prime.h>
 16#include <drm/drm_probe_helper.h>
 17#include <drm/drm_fb_helper.h>
 18#include <drm/drm_of.h>
 19#include <drm/drm_vblank.h>
 20
 21#include "armada_crtc.h"
 22#include "armada_drm.h"
 23#include "armada_gem.h"
 24#include "armada_fb.h"
 25#include "armada_hw.h"
 26#include <drm/armada_drm.h>
 27#include "armada_ioctlP.h"
 28
 29static struct drm_ioctl_desc armada_ioctls[] = {
 30	DRM_IOCTL_DEF_DRV(ARMADA_GEM_CREATE, armada_gem_create_ioctl,0),
 31	DRM_IOCTL_DEF_DRV(ARMADA_GEM_MMAP, armada_gem_mmap_ioctl, 0),
 32	DRM_IOCTL_DEF_DRV(ARMADA_GEM_PWRITE, armada_gem_pwrite_ioctl, 0),
 33};
 34
 35DEFINE_DRM_GEM_FOPS(armada_drm_fops);
 36
 37static struct drm_driver armada_drm_driver = {
 38	.lastclose		= drm_fb_helper_lastclose,
 39	.gem_free_object_unlocked = armada_gem_free_object,
 40	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
 41	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
 42	.gem_prime_export	= armada_gem_prime_export,
 43	.gem_prime_import	= armada_gem_prime_import,
 44	.dumb_create		= armada_gem_dumb_create,
 45	.gem_vm_ops		= &armada_gem_vm_ops,
 46	.major			= 1,
 47	.minor			= 0,
 48	.name			= "armada-drm",
 49	.desc			= "Armada SoC DRM",
 50	.date			= "20120730",
 51	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 52	.ioctls			= armada_ioctls,
 53	.fops			= &armada_drm_fops,
 54};
 55
 56static const struct drm_mode_config_funcs armada_drm_mode_config_funcs = {
 57	.fb_create		= armada_fb_create,
 58	.output_poll_changed	= drm_fb_helper_output_poll_changed,
 59	.atomic_check		= drm_atomic_helper_check,
 60	.atomic_commit		= drm_atomic_helper_commit,
 61};
 62
 63static int armada_drm_bind(struct device *dev)
 64{
 65	struct armada_private *priv;
 66	struct resource *mem = NULL;
 67	int ret, n;
 68
 69	for (n = 0; ; n++) {
 70		struct resource *r = platform_get_resource(to_platform_device(dev),
 71							   IORESOURCE_MEM, n);
 72		if (!r)
 73			break;
 74
 75		/* Resources above 64K are graphics memory */
 76		if (resource_size(r) > SZ_64K)
 77			mem = r;
 78		else
 79			return -EINVAL;
 80	}
 81
 82	if (!mem)
 83		return -ENXIO;
 84
 85	if (!devm_request_mem_region(dev, mem->start, resource_size(mem),
 86				     "armada-drm"))
 87		return -EBUSY;
 88
 89	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 90	if (!priv)
 91		return -ENOMEM;
 92
 93	/*
 94	 * The drm_device structure must be at the start of
 95	 * armada_private for drm_dev_put() to work correctly.
 96	 */
 97	BUILD_BUG_ON(offsetof(struct armada_private, drm) != 0);
 98
 99	ret = drm_dev_init(&priv->drm, &armada_drm_driver, dev);
100	if (ret) {
101		dev_err(dev, "[" DRM_NAME ":%s] drm_dev_init failed: %d\n",
102			__func__, ret);
103		kfree(priv);
104		return ret;
105	}
106
107	/* Remove early framebuffers */
108	ret = drm_fb_helper_remove_conflicting_framebuffers(NULL,
109							    "armada-drm-fb",
110							    false);
111	if (ret) {
112		dev_err(dev, "[" DRM_NAME ":%s] can't kick out simple-fb: %d\n",
113			__func__, ret);
114		kfree(priv);
115		return ret;
116	}
117
118	priv->drm.dev_private = priv;
119
120	dev_set_drvdata(dev, &priv->drm);
121
122	/* Mode setting support */
123	drm_mode_config_init(&priv->drm);
124	priv->drm.mode_config.min_width = 320;
125	priv->drm.mode_config.min_height = 200;
126
127	/*
128	 * With vscale enabled, the maximum width is 1920 due to the
129	 * 1920 by 3 lines RAM
130	 */
131	priv->drm.mode_config.max_width = 1920;
132	priv->drm.mode_config.max_height = 2048;
133
134	priv->drm.mode_config.preferred_depth = 24;
135	priv->drm.mode_config.funcs = &armada_drm_mode_config_funcs;
136	drm_mm_init(&priv->linear, mem->start, resource_size(mem));
137	mutex_init(&priv->linear_lock);
138
139	ret = component_bind_all(dev, &priv->drm);
140	if (ret)
141		goto err_kms;
142
143	ret = drm_vblank_init(&priv->drm, priv->drm.mode_config.num_crtc);
144	if (ret)
145		goto err_comp;
146
147	priv->drm.irq_enabled = true;
148
149	drm_mode_config_reset(&priv->drm);
150
151	ret = armada_fbdev_init(&priv->drm);
152	if (ret)
153		goto err_comp;
154
155	drm_kms_helper_poll_init(&priv->drm);
156
157	ret = drm_dev_register(&priv->drm, 0);
158	if (ret)
159		goto err_poll;
160
161#ifdef CONFIG_DEBUG_FS
162	armada_drm_debugfs_init(priv->drm.primary);
163#endif
164
165	return 0;
166
167 err_poll:
168	drm_kms_helper_poll_fini(&priv->drm);
169	armada_fbdev_fini(&priv->drm);
170 err_comp:
171	component_unbind_all(dev, &priv->drm);
172 err_kms:
173	drm_mode_config_cleanup(&priv->drm);
174	drm_mm_takedown(&priv->linear);
175	drm_dev_put(&priv->drm);
176	return ret;
177}
178
179static void armada_drm_unbind(struct device *dev)
180{
181	struct drm_device *drm = dev_get_drvdata(dev);
182	struct armada_private *priv = drm->dev_private;
183
184	drm_kms_helper_poll_fini(&priv->drm);
185	armada_fbdev_fini(&priv->drm);
186
187	drm_dev_unregister(&priv->drm);
188
189	drm_atomic_helper_shutdown(&priv->drm);
190
191	component_unbind_all(dev, &priv->drm);
192
193	drm_mode_config_cleanup(&priv->drm);
194	drm_mm_takedown(&priv->linear);
195
196	drm_dev_put(&priv->drm);
197}
198
199static int compare_of(struct device *dev, void *data)
200{
201	return dev->of_node == data;
202}
203
204static int compare_dev_name(struct device *dev, void *data)
205{
206	const char *name = data;
207	return !strcmp(dev_name(dev), name);
208}
209
210static void armada_add_endpoints(struct device *dev,
211	struct component_match **match, struct device_node *dev_node)
212{
213	struct device_node *ep, *remote;
214
215	for_each_endpoint_of_node(dev_node, ep) {
216		remote = of_graph_get_remote_port_parent(ep);
217		if (remote && of_device_is_available(remote))
218			drm_of_component_match_add(dev, match, compare_of,
219						   remote);
220		of_node_put(remote);
221	}
222}
223
224static const struct component_master_ops armada_master_ops = {
225	.bind = armada_drm_bind,
226	.unbind = armada_drm_unbind,
227};
228
229static int armada_drm_probe(struct platform_device *pdev)
230{
231	struct component_match *match = NULL;
232	struct device *dev = &pdev->dev;
233	int ret;
234
235	ret = drm_of_component_probe(dev, compare_dev_name, &armada_master_ops);
236	if (ret != -EINVAL)
237		return ret;
238
239	if (dev->platform_data) {
240		char **devices = dev->platform_data;
241		struct device *d;
242		int i;
243
244		for (i = 0; devices[i]; i++)
245			component_match_add(dev, &match, compare_dev_name,
246					    devices[i]);
247
248		if (i == 0) {
249			dev_err(dev, "missing 'ports' property\n");
250			return -ENODEV;
251		}
252
253		for (i = 0; devices[i]; i++) {
254			d = bus_find_device_by_name(&platform_bus_type, NULL,
255						    devices[i]);
256			if (d && d->of_node)
257				armada_add_endpoints(dev, &match, d->of_node);
258			put_device(d);
259		}
260	}
261
262	return component_master_add_with_match(&pdev->dev, &armada_master_ops,
263					       match);
264}
265
266static int armada_drm_remove(struct platform_device *pdev)
267{
268	component_master_del(&pdev->dev, &armada_master_ops);
269	return 0;
270}
271
272static const struct platform_device_id armada_drm_platform_ids[] = {
273	{
274		.name		= "armada-drm",
275	}, {
276		.name		= "armada-510-drm",
277	},
278	{ },
279};
280MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
281
282static struct platform_driver armada_drm_platform_driver = {
283	.probe	= armada_drm_probe,
284	.remove	= armada_drm_remove,
285	.driver	= {
286		.name	= "armada-drm",
287	},
288	.id_table = armada_drm_platform_ids,
289};
290
291static int __init armada_drm_init(void)
292{
293	int ret;
294
295	armada_drm_driver.num_ioctls = ARRAY_SIZE(armada_ioctls);
296
297	ret = platform_driver_register(&armada_lcd_platform_driver);
298	if (ret)
299		return ret;
300	ret = platform_driver_register(&armada_drm_platform_driver);
301	if (ret)
302		platform_driver_unregister(&armada_lcd_platform_driver);
303	return ret;
304}
305module_init(armada_drm_init);
306
307static void __exit armada_drm_exit(void)
308{
309	platform_driver_unregister(&armada_drm_platform_driver);
310	platform_driver_unregister(&armada_lcd_platform_driver);
311}
312module_exit(armada_drm_exit);
313
314MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>");
315MODULE_DESCRIPTION("Armada DRM Driver");
316MODULE_LICENSE("GPL");
317MODULE_ALIAS("platform:armada-drm");