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 <drm/drm_of.h>
15#include "armada_crtc.h"
16#include "armada_drm.h"
17#include "armada_gem.h"
18#include "armada_hw.h"
19#include <drm/armada_drm.h>
20#include "armada_ioctlP.h"
21
22static void armada_drm_unref_work(struct work_struct *work)
23{
24	struct armada_private *priv =
25		container_of(work, struct armada_private, fb_unref_work);
26	struct drm_framebuffer *fb;
27
28	while (kfifo_get(&priv->fb_unref, &fb))
29		drm_framebuffer_unreference(fb);
30}
31
32/* Must be called with dev->event_lock held */
33void __armada_drm_queue_unref_work(struct drm_device *dev,
34	struct drm_framebuffer *fb)
35{
36	struct armada_private *priv = dev->dev_private;
37
38	WARN_ON(!kfifo_put(&priv->fb_unref, fb));
39	schedule_work(&priv->fb_unref_work);
40}
41
42void armada_drm_queue_unref_work(struct drm_device *dev,
43	struct drm_framebuffer *fb)
44{
45	unsigned long flags;
46
47	spin_lock_irqsave(&dev->event_lock, flags);
48	__armada_drm_queue_unref_work(dev, fb);
49	spin_unlock_irqrestore(&dev->event_lock, flags);
50}
51
52static int armada_drm_load(struct drm_device *dev, unsigned long flags)
53{
54	struct armada_private *priv;
55	struct resource *mem = NULL;
56	int ret, n;
57
58	for (n = 0; ; n++) {
59		struct resource *r = platform_get_resource(dev->platformdev,
60							   IORESOURCE_MEM, n);
61		if (!r)
62			break;
63
64		/* Resources above 64K are graphics memory */
65		if (resource_size(r) > SZ_64K)
66			mem = r;
67		else
68			return -EINVAL;
69	}
70
71	if (!mem)
72		return -ENXIO;
73
74	if (!devm_request_mem_region(dev->dev, mem->start,
75			resource_size(mem), "armada-drm"))
76		return -EBUSY;
77
78	priv = devm_kzalloc(dev->dev, sizeof(*priv), GFP_KERNEL);
79	if (!priv) {
80		DRM_ERROR("failed to allocate private\n");
81		return -ENOMEM;
82	}
83
84	platform_set_drvdata(dev->platformdev, dev);
85	dev->dev_private = priv;
86
87	INIT_WORK(&priv->fb_unref_work, armada_drm_unref_work);
88	INIT_KFIFO(priv->fb_unref);
89
90	/* Mode setting support */
91	drm_mode_config_init(dev);
92	dev->mode_config.min_width = 320;
93	dev->mode_config.min_height = 200;
94
95	/*
96	 * With vscale enabled, the maximum width is 1920 due to the
97	 * 1920 by 3 lines RAM
98	 */
99	dev->mode_config.max_width = 1920;
100	dev->mode_config.max_height = 2048;
101
102	dev->mode_config.preferred_depth = 24;
103	dev->mode_config.funcs = &armada_drm_mode_config_funcs;
104	drm_mm_init(&priv->linear, mem->start, resource_size(mem));
105
106	ret = component_bind_all(dev->dev, dev);
107	if (ret)
108		goto err_kms;
109
110	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
111	if (ret)
112		goto err_comp;
113
114	dev->irq_enabled = true;
115	dev->vblank_disable_allowed = 1;
116
117	ret = armada_fbdev_init(dev);
118	if (ret)
119		goto err_comp;
120
121	drm_kms_helper_poll_init(dev);
122
123	return 0;
124
125 err_comp:
126	component_unbind_all(dev->dev, dev);
127 err_kms:
128	drm_mode_config_cleanup(dev);
129	drm_mm_takedown(&priv->linear);
130	flush_work(&priv->fb_unref_work);
131
132	return ret;
133}
134
135static int armada_drm_unload(struct drm_device *dev)
136{
137	struct armada_private *priv = dev->dev_private;
138
139	drm_kms_helper_poll_fini(dev);
140	armada_fbdev_fini(dev);
141
142	component_unbind_all(dev->dev, dev);
143
144	drm_mode_config_cleanup(dev);
145	drm_mm_takedown(&priv->linear);
146	flush_work(&priv->fb_unref_work);
147	dev->dev_private = NULL;
148
149	return 0;
150}
151
152/* These are called under the vbl_lock. */
153static int armada_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
154{
155	struct armada_private *priv = dev->dev_private;
156	armada_drm_crtc_enable_irq(priv->dcrtc[pipe], VSYNC_IRQ_ENA);
157	return 0;
158}
159
160static void armada_drm_disable_vblank(struct drm_device *dev, unsigned int pipe)
161{
162	struct armada_private *priv = dev->dev_private;
163	armada_drm_crtc_disable_irq(priv->dcrtc[pipe], VSYNC_IRQ_ENA);
164}
165
166static struct drm_ioctl_desc armada_ioctls[] = {
167	DRM_IOCTL_DEF_DRV(ARMADA_GEM_CREATE, armada_gem_create_ioctl,0),
168	DRM_IOCTL_DEF_DRV(ARMADA_GEM_MMAP, armada_gem_mmap_ioctl, 0),
169	DRM_IOCTL_DEF_DRV(ARMADA_GEM_PWRITE, armada_gem_pwrite_ioctl, 0),
170};
171
172static void armada_drm_lastclose(struct drm_device *dev)
173{
174	armada_fbdev_lastclose(dev);
175}
176
177static const struct file_operations armada_drm_fops = {
178	.owner			= THIS_MODULE,
179	.llseek			= no_llseek,
180	.read			= drm_read,
181	.poll			= drm_poll,
182	.unlocked_ioctl		= drm_ioctl,
183	.mmap			= drm_gem_mmap,
184	.open			= drm_open,
185	.release		= drm_release,
186};
187
188static struct drm_driver armada_drm_driver = {
189	.load			= armada_drm_load,
190	.open			= NULL,
191	.preclose		= NULL,
192	.postclose		= NULL,
193	.lastclose		= armada_drm_lastclose,
194	.unload			= armada_drm_unload,
195	.set_busid		= drm_platform_set_busid,
196	.get_vblank_counter	= drm_vblank_no_hw_counter,
197	.enable_vblank		= armada_drm_enable_vblank,
198	.disable_vblank		= armada_drm_disable_vblank,
199#ifdef CONFIG_DEBUG_FS
200	.debugfs_init		= armada_drm_debugfs_init,
201	.debugfs_cleanup	= armada_drm_debugfs_cleanup,
202#endif
203	.gem_free_object	= armada_gem_free_object,
204	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
205	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
206	.gem_prime_export	= armada_gem_prime_export,
207	.gem_prime_import	= armada_gem_prime_import,
208	.dumb_create		= armada_gem_dumb_create,
209	.dumb_map_offset	= armada_gem_dumb_map_offset,
210	.dumb_destroy		= armada_gem_dumb_destroy,
211	.gem_vm_ops		= &armada_gem_vm_ops,
212	.major			= 1,
213	.minor			= 0,
214	.name			= "armada-drm",
215	.desc			= "Armada SoC DRM",
216	.date			= "20120730",
217	.driver_features	= DRIVER_GEM | DRIVER_MODESET |
218				  DRIVER_HAVE_IRQ | DRIVER_PRIME,
219	.ioctls			= armada_ioctls,
220	.fops			= &armada_drm_fops,
221};
222
223static int armada_drm_bind(struct device *dev)
224{
225	return drm_platform_init(&armada_drm_driver, to_platform_device(dev));
226}
227
228static void armada_drm_unbind(struct device *dev)
229{
230	drm_put_dev(dev_get_drvdata(dev));
231}
232
233static int compare_of(struct device *dev, void *data)
234{
235	return dev->of_node == data;
236}
237
238static int compare_dev_name(struct device *dev, void *data)
239{
240	const char *name = data;
241	return !strcmp(dev_name(dev), name);
242}
243
244static void armada_add_endpoints(struct device *dev,
245	struct component_match **match, struct device_node *port)
246{
247	struct device_node *ep, *remote;
248
249	for_each_child_of_node(port, ep) {
250		remote = of_graph_get_remote_port_parent(ep);
251		if (!remote || !of_device_is_available(remote)) {
252			of_node_put(remote);
253			continue;
254		} else if (!of_device_is_available(remote->parent)) {
255			dev_warn(dev, "parent device of %s is not available\n",
256				 remote->full_name);
257			of_node_put(remote);
258			continue;
259		}
260
261		component_match_add(dev, match, compare_of, remote);
262		of_node_put(remote);
263	}
264}
265
266static const struct component_master_ops armada_master_ops = {
267	.bind = armada_drm_bind,
268	.unbind = armada_drm_unbind,
269};
270
271static int armada_drm_probe(struct platform_device *pdev)
272{
273	struct component_match *match = NULL;
274	struct device *dev = &pdev->dev;
275	int ret;
276
277	ret = drm_of_component_probe(dev, compare_dev_name, &armada_master_ops);
278	if (ret != -EINVAL)
279		return ret;
280
281	if (dev->platform_data) {
282		char **devices = dev->platform_data;
283		struct device_node *port;
284		struct device *d;
285		int i;
286
287		for (i = 0; devices[i]; i++)
288			component_match_add(dev, &match, compare_dev_name,
289					    devices[i]);
290
291		if (i == 0) {
292			dev_err(dev, "missing 'ports' property\n");
293			return -ENODEV;
294		}
295
296		for (i = 0; devices[i]; i++) {
297			d = bus_find_device_by_name(&platform_bus_type, NULL,
298						    devices[i]);
299			if (d && d->of_node) {
300				for_each_child_of_node(d->of_node, port)
301					armada_add_endpoints(dev, &match, port);
302			}
303			put_device(d);
304		}
305	}
306
307	return component_master_add_with_match(&pdev->dev, &armada_master_ops,
308					       match);
309}
310
311static int armada_drm_remove(struct platform_device *pdev)
312{
313	component_master_del(&pdev->dev, &armada_master_ops);
314	return 0;
315}
316
317static const struct platform_device_id armada_drm_platform_ids[] = {
318	{
319		.name		= "armada-drm",
320	}, {
321		.name		= "armada-510-drm",
322	},
323	{ },
324};
325MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
326
327static struct platform_driver armada_drm_platform_driver = {
328	.probe	= armada_drm_probe,
329	.remove	= armada_drm_remove,
330	.driver	= {
331		.name	= "armada-drm",
332	},
333	.id_table = armada_drm_platform_ids,
334};
335
336static int __init armada_drm_init(void)
337{
338	int ret;
339
340	armada_drm_driver.num_ioctls = ARRAY_SIZE(armada_ioctls);
341
342	ret = platform_driver_register(&armada_lcd_platform_driver);
343	if (ret)
344		return ret;
345	ret = platform_driver_register(&armada_drm_platform_driver);
346	if (ret)
347		platform_driver_unregister(&armada_lcd_platform_driver);
348	return ret;
349}
350module_init(armada_drm_init);
351
352static void __exit armada_drm_exit(void)
353{
354	platform_driver_unregister(&armada_drm_platform_driver);
355	platform_driver_unregister(&armada_lcd_platform_driver);
356}
357module_exit(armada_drm_exit);
358
359MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>");
360MODULE_DESCRIPTION("Armada DRM Driver");
361MODULE_LICENSE("GPL");
362MODULE_ALIAS("platform:armada-drm");
363