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	mutex_init(&priv->linear_lock);
106
107	ret = component_bind_all(dev->dev, dev);
108	if (ret)
109		goto err_kms;
110
111	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
112	if (ret)
113		goto err_comp;
114
115	dev->irq_enabled = true;
116	dev->vblank_disable_allowed = 1;
117
118	ret = armada_fbdev_init(dev);
119	if (ret)
120		goto err_comp;
121
122	drm_kms_helper_poll_init(dev);
123
124	return 0;
125
126 err_comp:
127	component_unbind_all(dev->dev, dev);
128 err_kms:
129	drm_mode_config_cleanup(dev);
130	drm_mm_takedown(&priv->linear);
131	flush_work(&priv->fb_unref_work);
132
133	return ret;
134}
135
136static int armada_drm_unload(struct drm_device *dev)
137{
138	struct armada_private *priv = dev->dev_private;
139
140	drm_kms_helper_poll_fini(dev);
141	armada_fbdev_fini(dev);
142
143	component_unbind_all(dev->dev, dev);
144
145	drm_mode_config_cleanup(dev);
146	drm_mm_takedown(&priv->linear);
147	flush_work(&priv->fb_unref_work);
148	dev->dev_private = NULL;
149
150	return 0;
151}
152
153/* These are called under the vbl_lock. */
154static int armada_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
155{
156	struct armada_private *priv = dev->dev_private;
157	armada_drm_crtc_enable_irq(priv->dcrtc[pipe], VSYNC_IRQ_ENA);
158	return 0;
159}
160
161static void armada_drm_disable_vblank(struct drm_device *dev, unsigned int pipe)
162{
163	struct armada_private *priv = dev->dev_private;
164	armada_drm_crtc_disable_irq(priv->dcrtc[pipe], VSYNC_IRQ_ENA);
165}
166
167static struct drm_ioctl_desc armada_ioctls[] = {
168	DRM_IOCTL_DEF_DRV(ARMADA_GEM_CREATE, armada_gem_create_ioctl,0),
169	DRM_IOCTL_DEF_DRV(ARMADA_GEM_MMAP, armada_gem_mmap_ioctl, 0),
170	DRM_IOCTL_DEF_DRV(ARMADA_GEM_PWRITE, armada_gem_pwrite_ioctl, 0),
171};
172
173static void armada_drm_lastclose(struct drm_device *dev)
174{
175	armada_fbdev_lastclose(dev);
176}
177
178static const struct file_operations armada_drm_fops = {
179	.owner			= THIS_MODULE,
180	.llseek			= no_llseek,
181	.read			= drm_read,
182	.poll			= drm_poll,
183	.unlocked_ioctl		= drm_ioctl,
184	.mmap			= drm_gem_mmap,
185	.open			= drm_open,
186	.release		= drm_release,
187};
188
189static struct drm_driver armada_drm_driver = {
190	.load			= armada_drm_load,
191	.lastclose		= armada_drm_lastclose,
192	.unload			= armada_drm_unload,
193	.set_busid		= drm_platform_set_busid,
194	.get_vblank_counter	= drm_vblank_no_hw_counter,
195	.enable_vblank		= armada_drm_enable_vblank,
196	.disable_vblank		= armada_drm_disable_vblank,
197#ifdef CONFIG_DEBUG_FS
198	.debugfs_init		= armada_drm_debugfs_init,
199	.debugfs_cleanup	= armada_drm_debugfs_cleanup,
200#endif
201	.gem_free_object	= armada_gem_free_object,
202	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
203	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
204	.gem_prime_export	= armada_gem_prime_export,
205	.gem_prime_import	= armada_gem_prime_import,
206	.dumb_create		= armada_gem_dumb_create,
207	.dumb_map_offset	= armada_gem_dumb_map_offset,
208	.dumb_destroy		= armada_gem_dumb_destroy,
209	.gem_vm_ops		= &armada_gem_vm_ops,
210	.major			= 1,
211	.minor			= 0,
212	.name			= "armada-drm",
213	.desc			= "Armada SoC DRM",
214	.date			= "20120730",
215	.driver_features	= DRIVER_GEM | DRIVER_MODESET |
216				  DRIVER_HAVE_IRQ | DRIVER_PRIME,
217	.ioctls			= armada_ioctls,
218	.fops			= &armada_drm_fops,
219};
220
221static int armada_drm_bind(struct device *dev)
222{
223	return drm_platform_init(&armada_drm_driver, to_platform_device(dev));
224}
225
226static void armada_drm_unbind(struct device *dev)
227{
228	drm_put_dev(dev_get_drvdata(dev));
229}
230
231static int compare_of(struct device *dev, void *data)
232{
233	return dev->of_node == data;
234}
235
236static int compare_dev_name(struct device *dev, void *data)
237{
238	const char *name = data;
239	return !strcmp(dev_name(dev), name);
240}
241
242static void armada_add_endpoints(struct device *dev,
243	struct component_match **match, struct device_node *port)
244{
245	struct device_node *ep, *remote;
246
247	for_each_child_of_node(port, ep) {
248		remote = of_graph_get_remote_port_parent(ep);
249		if (!remote || !of_device_is_available(remote)) {
250			of_node_put(remote);
251			continue;
252		} else if (!of_device_is_available(remote->parent)) {
253			dev_warn(dev, "parent device of %s is not available\n",
254				 remote->full_name);
255			of_node_put(remote);
256			continue;
257		}
258
259		component_match_add(dev, match, compare_of, remote);
260		of_node_put(remote);
261	}
262}
263
264static const struct component_master_ops armada_master_ops = {
265	.bind = armada_drm_bind,
266	.unbind = armada_drm_unbind,
267};
268
269static int armada_drm_probe(struct platform_device *pdev)
270{
271	struct component_match *match = NULL;
272	struct device *dev = &pdev->dev;
273	int ret;
274
275	ret = drm_of_component_probe(dev, compare_dev_name, &armada_master_ops);
276	if (ret != -EINVAL)
277		return ret;
278
279	if (dev->platform_data) {
280		char **devices = dev->platform_data;
281		struct device_node *port;
282		struct device *d;
283		int i;
284
285		for (i = 0; devices[i]; i++)
286			component_match_add(dev, &match, compare_dev_name,
287					    devices[i]);
288
289		if (i == 0) {
290			dev_err(dev, "missing 'ports' property\n");
291			return -ENODEV;
292		}
293
294		for (i = 0; devices[i]; i++) {
295			d = bus_find_device_by_name(&platform_bus_type, NULL,
296						    devices[i]);
297			if (d && d->of_node) {
298				for_each_child_of_node(d->of_node, port)
299					armada_add_endpoints(dev, &match, port);
300			}
301			put_device(d);
302		}
303	}
304
305	return component_master_add_with_match(&pdev->dev, &armada_master_ops,
306					       match);
307}
308
309static int armada_drm_remove(struct platform_device *pdev)
310{
311	component_master_del(&pdev->dev, &armada_master_ops);
312	return 0;
313}
314
315static const struct platform_device_id armada_drm_platform_ids[] = {
316	{
317		.name		= "armada-drm",
318	}, {
319		.name		= "armada-510-drm",
320	},
321	{ },
322};
323MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
324
325static struct platform_driver armada_drm_platform_driver = {
326	.probe	= armada_drm_probe,
327	.remove	= armada_drm_remove,
328	.driver	= {
329		.name	= "armada-drm",
330	},
331	.id_table = armada_drm_platform_ids,
332};
333
334static int __init armada_drm_init(void)
335{
336	int ret;
337
338	armada_drm_driver.num_ioctls = ARRAY_SIZE(armada_ioctls);
339
340	ret = platform_driver_register(&armada_lcd_platform_driver);
341	if (ret)
342		return ret;
343	ret = platform_driver_register(&armada_drm_platform_driver);
344	if (ret)
345		platform_driver_unregister(&armada_lcd_platform_driver);
346	return ret;
347}
348module_init(armada_drm_init);
349
350static void __exit armada_drm_exit(void)
351{
352	platform_driver_unregister(&armada_drm_platform_driver);
353	platform_driver_unregister(&armada_lcd_platform_driver);
354}
355module_exit(armada_drm_exit);
356
357MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>");
358MODULE_DESCRIPTION("Armada DRM Driver");
359MODULE_LICENSE("GPL");
360MODULE_ALIAS("platform:armada-drm");