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/drmP.h>
13#include <drm/drm_crtc_helper.h>
14#include "armada_crtc.h"
15#include "armada_drm.h"
16#include "armada_gem.h"
17#include "armada_hw.h"
18#include <drm/armada_drm.h>
19#include "armada_ioctlP.h"
20
21#ifdef CONFIG_DRM_ARMADA_TDA1998X
22#include <drm/i2c/tda998x.h>
23#include "armada_slave.h"
24
25static struct tda998x_encoder_params params = {
26	/* With 0x24, there is no translation between vp_out and int_vp
27	FB	LCD out	Pins	VIP	Int Vp
28	R:23:16	R:7:0	VPC7:0	7:0	7:0[R]
29	G:15:8	G:15:8	VPB7:0	23:16	23:16[G]
30	B:7:0	B:23:16	VPA7:0	15:8	15:8[B]
31	*/
32	.swap_a = 2,
33	.swap_b = 3,
34	.swap_c = 4,
35	.swap_d = 5,
36	.swap_e = 0,
37	.swap_f = 1,
38	.audio_cfg = BIT(2),
39	.audio_frame[1] = 1,
40	.audio_format = AFMT_SPDIF,
41	.audio_sample_rate = 44100,
42};
43
44static const struct armada_drm_slave_config tda19988_config = {
45	.i2c_adapter_id = 0,
46	.crtcs = 1 << 0, /* Only LCD0 at the moment */
47	.polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT,
48	.interlace_allowed = true,
49	.info = {
50		.type = "tda998x",
51		.addr = 0x70,
52		.platform_data = &params,
53	},
54};
55#endif
56
57static bool is_componentized(struct device *dev)
58{
59	return dev->of_node || dev->platform_data;
60}
61
62static void armada_drm_unref_work(struct work_struct *work)
63{
64	struct armada_private *priv =
65		container_of(work, struct armada_private, fb_unref_work);
66	struct drm_framebuffer *fb;
67
68	while (kfifo_get(&priv->fb_unref, &fb))
69		drm_framebuffer_unreference(fb);
70}
71
72/* Must be called with dev->event_lock held */
73void __armada_drm_queue_unref_work(struct drm_device *dev,
74	struct drm_framebuffer *fb)
75{
76	struct armada_private *priv = dev->dev_private;
77
78	WARN_ON(!kfifo_put(&priv->fb_unref, fb));
79	schedule_work(&priv->fb_unref_work);
80}
81
82void armada_drm_queue_unref_work(struct drm_device *dev,
83	struct drm_framebuffer *fb)
84{
85	unsigned long flags;
86
87	spin_lock_irqsave(&dev->event_lock, flags);
88	__armada_drm_queue_unref_work(dev, fb);
89	spin_unlock_irqrestore(&dev->event_lock, flags);
90}
91
92static int armada_drm_load(struct drm_device *dev, unsigned long flags)
93{
94	const struct platform_device_id *id;
95	const struct armada_variant *variant;
96	struct armada_private *priv;
97	struct resource *res[ARRAY_SIZE(priv->dcrtc)];
98	struct resource *mem = NULL;
99	int ret, n, i;
100
101	memset(res, 0, sizeof(res));
102
103	for (n = i = 0; ; n++) {
104		struct resource *r = platform_get_resource(dev->platformdev,
105							   IORESOURCE_MEM, n);
106		if (!r)
107			break;
108
109		/* Resources above 64K are graphics memory */
110		if (resource_size(r) > SZ_64K)
111			mem = r;
112		else if (i < ARRAY_SIZE(priv->dcrtc))
113			res[i++] = r;
114		else
115			return -EINVAL;
116	}
117
118	if (!mem)
119		return -ENXIO;
120
121	if (!devm_request_mem_region(dev->dev, mem->start,
122			resource_size(mem), "armada-drm"))
123		return -EBUSY;
124
125	priv = devm_kzalloc(dev->dev, sizeof(*priv), GFP_KERNEL);
126	if (!priv) {
127		DRM_ERROR("failed to allocate private\n");
128		return -ENOMEM;
129	}
130
131	platform_set_drvdata(dev->platformdev, dev);
132	dev->dev_private = priv;
133
134	/* Get the implementation specific driver data. */
135	id = platform_get_device_id(dev->platformdev);
136	if (!id)
137		return -ENXIO;
138
139	variant = (const struct armada_variant *)id->driver_data;
140
141	INIT_WORK(&priv->fb_unref_work, armada_drm_unref_work);
142	INIT_KFIFO(priv->fb_unref);
143
144	/* Mode setting support */
145	drm_mode_config_init(dev);
146	dev->mode_config.min_width = 320;
147	dev->mode_config.min_height = 200;
148
149	/*
150	 * With vscale enabled, the maximum width is 1920 due to the
151	 * 1920 by 3 lines RAM
152	 */
153	dev->mode_config.max_width = 1920;
154	dev->mode_config.max_height = 2048;
155
156	dev->mode_config.preferred_depth = 24;
157	dev->mode_config.funcs = &armada_drm_mode_config_funcs;
158	drm_mm_init(&priv->linear, mem->start, resource_size(mem));
159
160	/* Create all LCD controllers */
161	for (n = 0; n < ARRAY_SIZE(priv->dcrtc); n++) {
162		int irq;
163
164		if (!res[n])
165			break;
166
167		irq = platform_get_irq(dev->platformdev, n);
168		if (irq < 0)
169			goto err_kms;
170
171		ret = armada_drm_crtc_create(dev, dev->dev, res[n], irq,
172					     variant, NULL);
173		if (ret)
174			goto err_kms;
175	}
176
177	if (is_componentized(dev->dev)) {
178		ret = component_bind_all(dev->dev, dev);
179		if (ret)
180			goto err_kms;
181	} else {
182#ifdef CONFIG_DRM_ARMADA_TDA1998X
183		ret = armada_drm_connector_slave_create(dev, &tda19988_config);
184		if (ret)
185			goto err_kms;
186#endif
187	}
188
189	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
190	if (ret)
191		goto err_comp;
192
193	dev->irq_enabled = true;
194	dev->vblank_disable_allowed = 1;
195
196	ret = armada_fbdev_init(dev);
197	if (ret)
198		goto err_comp;
199
200	drm_kms_helper_poll_init(dev);
201
202	return 0;
203
204 err_comp:
205	if (is_componentized(dev->dev))
206		component_unbind_all(dev->dev, dev);
207 err_kms:
208	drm_mode_config_cleanup(dev);
209	drm_mm_takedown(&priv->linear);
210	flush_work(&priv->fb_unref_work);
211
212	return ret;
213}
214
215static int armada_drm_unload(struct drm_device *dev)
216{
217	struct armada_private *priv = dev->dev_private;
218
219	drm_kms_helper_poll_fini(dev);
220	armada_fbdev_fini(dev);
221
222	if (is_componentized(dev->dev))
223		component_unbind_all(dev->dev, dev);
224
225	drm_mode_config_cleanup(dev);
226	drm_mm_takedown(&priv->linear);
227	flush_work(&priv->fb_unref_work);
228	dev->dev_private = NULL;
229
230	return 0;
231}
232
233void armada_drm_vbl_event_add(struct armada_crtc *dcrtc,
234	struct armada_vbl_event *evt)
235{
236	unsigned long flags;
237
238	spin_lock_irqsave(&dcrtc->irq_lock, flags);
239	if (list_empty(&evt->node)) {
240		list_add_tail(&evt->node, &dcrtc->vbl_list);
241
242		drm_vblank_get(dcrtc->crtc.dev, dcrtc->num);
243	}
244	spin_unlock_irqrestore(&dcrtc->irq_lock, flags);
245}
246
247void armada_drm_vbl_event_remove(struct armada_crtc *dcrtc,
248	struct armada_vbl_event *evt)
249{
250	if (!list_empty(&evt->node)) {
251		list_del_init(&evt->node);
252		drm_vblank_put(dcrtc->crtc.dev, dcrtc->num);
253	}
254}
255
256void armada_drm_vbl_event_remove_unlocked(struct armada_crtc *dcrtc,
257	struct armada_vbl_event *evt)
258{
259	unsigned long flags;
260
261	spin_lock_irqsave(&dcrtc->irq_lock, flags);
262	armada_drm_vbl_event_remove(dcrtc, evt);
263	spin_unlock_irqrestore(&dcrtc->irq_lock, flags);
264}
265
266/* These are called under the vbl_lock. */
267static int armada_drm_enable_vblank(struct drm_device *dev, int crtc)
268{
269	struct armada_private *priv = dev->dev_private;
270	armada_drm_crtc_enable_irq(priv->dcrtc[crtc], VSYNC_IRQ_ENA);
271	return 0;
272}
273
274static void armada_drm_disable_vblank(struct drm_device *dev, int crtc)
275{
276	struct armada_private *priv = dev->dev_private;
277	armada_drm_crtc_disable_irq(priv->dcrtc[crtc], VSYNC_IRQ_ENA);
278}
279
280static struct drm_ioctl_desc armada_ioctls[] = {
281	DRM_IOCTL_DEF_DRV(ARMADA_GEM_CREATE, armada_gem_create_ioctl,
282		DRM_UNLOCKED),
283	DRM_IOCTL_DEF_DRV(ARMADA_GEM_MMAP, armada_gem_mmap_ioctl,
284		DRM_UNLOCKED),
285	DRM_IOCTL_DEF_DRV(ARMADA_GEM_PWRITE, armada_gem_pwrite_ioctl,
286		DRM_UNLOCKED),
287};
288
289static void armada_drm_lastclose(struct drm_device *dev)
290{
291	armada_fbdev_lastclose(dev);
292}
293
294static const struct file_operations armada_drm_fops = {
295	.owner			= THIS_MODULE,
296	.llseek			= no_llseek,
297	.read			= drm_read,
298	.poll			= drm_poll,
299	.unlocked_ioctl		= drm_ioctl,
300	.mmap			= drm_gem_mmap,
301	.open			= drm_open,
302	.release		= drm_release,
303};
304
305static struct drm_driver armada_drm_driver = {
306	.load			= armada_drm_load,
307	.open			= NULL,
308	.preclose		= NULL,
309	.postclose		= NULL,
310	.lastclose		= armada_drm_lastclose,
311	.unload			= armada_drm_unload,
312	.set_busid		= drm_platform_set_busid,
313	.get_vblank_counter	= drm_vblank_count,
314	.enable_vblank		= armada_drm_enable_vblank,
315	.disable_vblank		= armada_drm_disable_vblank,
316#ifdef CONFIG_DEBUG_FS
317	.debugfs_init		= armada_drm_debugfs_init,
318	.debugfs_cleanup	= armada_drm_debugfs_cleanup,
319#endif
320	.gem_free_object	= armada_gem_free_object,
321	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
322	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
323	.gem_prime_export	= armada_gem_prime_export,
324	.gem_prime_import	= armada_gem_prime_import,
325	.dumb_create		= armada_gem_dumb_create,
326	.dumb_map_offset	= armada_gem_dumb_map_offset,
327	.dumb_destroy		= armada_gem_dumb_destroy,
328	.gem_vm_ops		= &armada_gem_vm_ops,
329	.major			= 1,
330	.minor			= 0,
331	.name			= "armada-drm",
332	.desc			= "Armada SoC DRM",
333	.date			= "20120730",
334	.driver_features	= DRIVER_GEM | DRIVER_MODESET |
335				  DRIVER_HAVE_IRQ | DRIVER_PRIME,
336	.ioctls			= armada_ioctls,
337	.fops			= &armada_drm_fops,
338};
339
340static int armada_drm_bind(struct device *dev)
341{
342	return drm_platform_init(&armada_drm_driver, to_platform_device(dev));
343}
344
345static void armada_drm_unbind(struct device *dev)
346{
347	drm_put_dev(dev_get_drvdata(dev));
348}
349
350static int compare_of(struct device *dev, void *data)
351{
352	return dev->of_node == data;
353}
354
355static int compare_dev_name(struct device *dev, void *data)
356{
357	const char *name = data;
358	return !strcmp(dev_name(dev), name);
359}
360
361static void armada_add_endpoints(struct device *dev,
362	struct component_match **match, struct device_node *port)
363{
364	struct device_node *ep, *remote;
365
366	for_each_child_of_node(port, ep) {
367		remote = of_graph_get_remote_port_parent(ep);
368		if (!remote || !of_device_is_available(remote)) {
369			of_node_put(remote);
370			continue;
371		} else if (!of_device_is_available(remote->parent)) {
372			dev_warn(dev, "parent device of %s is not available\n",
373				 remote->full_name);
374			of_node_put(remote);
375			continue;
376		}
377
378		component_match_add(dev, match, compare_of, remote);
379		of_node_put(remote);
380	}
381}
382
383static int armada_drm_find_components(struct device *dev,
384	struct component_match **match)
385{
386	struct device_node *port;
387	int i;
388
389	if (dev->of_node) {
390		struct device_node *np = dev->of_node;
391
392		for (i = 0; ; i++) {
393			port = of_parse_phandle(np, "ports", i);
394			if (!port)
395				break;
396
397			component_match_add(dev, match, compare_of, port);
398			of_node_put(port);
399		}
400
401		if (i == 0) {
402			dev_err(dev, "missing 'ports' property\n");
403			return -ENODEV;
404		}
405
406		for (i = 0; ; i++) {
407			port = of_parse_phandle(np, "ports", i);
408			if (!port)
409				break;
410
411			armada_add_endpoints(dev, match, port);
412			of_node_put(port);
413		}
414	} else if (dev->platform_data) {
415		char **devices = dev->platform_data;
416		struct device *d;
417
418		for (i = 0; devices[i]; i++)
419			component_match_add(dev, match, compare_dev_name,
420					    devices[i]);
421
422		if (i == 0) {
423			dev_err(dev, "missing 'ports' property\n");
424			return -ENODEV;
425		}
426
427		for (i = 0; devices[i]; i++) {
428			d = bus_find_device_by_name(&platform_bus_type, NULL,
429					devices[i]);
430			if (d && d->of_node) {
431				for_each_child_of_node(d->of_node, port)
432					armada_add_endpoints(dev, match, port);
433			}
434			put_device(d);
435		}
436	}
437
438	return 0;
439}
440
441static const struct component_master_ops armada_master_ops = {
442	.bind = armada_drm_bind,
443	.unbind = armada_drm_unbind,
444};
445
446static int armada_drm_probe(struct platform_device *pdev)
447{
448	if (is_componentized(&pdev->dev)) {
449		struct component_match *match = NULL;
450		int ret;
451
452		ret = armada_drm_find_components(&pdev->dev, &match);
453		if (ret < 0)
454			return ret;
455
456		return component_master_add_with_match(&pdev->dev,
457				&armada_master_ops, match);
458	} else {
459		return drm_platform_init(&armada_drm_driver, pdev);
460	}
461}
462
463static int armada_drm_remove(struct platform_device *pdev)
464{
465	if (is_componentized(&pdev->dev))
466		component_master_del(&pdev->dev, &armada_master_ops);
467	else
468		drm_put_dev(platform_get_drvdata(pdev));
469	return 0;
470}
471
472static const struct platform_device_id armada_drm_platform_ids[] = {
473	{
474		.name		= "armada-drm",
475		.driver_data	= (unsigned long)&armada510_ops,
476	}, {
477		.name		= "armada-510-drm",
478		.driver_data	= (unsigned long)&armada510_ops,
479	},
480	{ },
481};
482MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
483
484static struct platform_driver armada_drm_platform_driver = {
485	.probe	= armada_drm_probe,
486	.remove	= armada_drm_remove,
487	.driver	= {
488		.name	= "armada-drm",
489	},
490	.id_table = armada_drm_platform_ids,
491};
492
493static int __init armada_drm_init(void)
494{
495	int ret;
496
497	armada_drm_driver.num_ioctls = ARRAY_SIZE(armada_ioctls);
498
499	ret = platform_driver_register(&armada_lcd_platform_driver);
500	if (ret)
501		return ret;
502	ret = platform_driver_register(&armada_drm_platform_driver);
503	if (ret)
504		platform_driver_unregister(&armada_lcd_platform_driver);
505	return ret;
506}
507module_init(armada_drm_init);
508
509static void __exit armada_drm_exit(void)
510{
511	platform_driver_unregister(&armada_drm_platform_driver);
512	platform_driver_unregister(&armada_lcd_platform_driver);
513}
514module_exit(armada_drm_exit);
515
516MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>");
517MODULE_DESCRIPTION("Armada DRM Driver");
518MODULE_LICENSE("GPL");
519MODULE_ALIAS("platform:armada-drm");
520