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