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
 52/* These are called under the vbl_lock. */
 53static int armada_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
 54{
 55	struct armada_private *priv = dev->dev_private;
 56	armada_drm_crtc_enable_irq(priv->dcrtc[pipe], VSYNC_IRQ_ENA);
 57	return 0;
 58}
 59
 60static void armada_drm_disable_vblank(struct drm_device *dev, unsigned int pipe)
 61{
 62	struct armada_private *priv = dev->dev_private;
 63	armada_drm_crtc_disable_irq(priv->dcrtc[pipe], VSYNC_IRQ_ENA);
 64}
 65
 66static struct drm_ioctl_desc armada_ioctls[] = {
 67	DRM_IOCTL_DEF_DRV(ARMADA_GEM_CREATE, armada_gem_create_ioctl,0),
 68	DRM_IOCTL_DEF_DRV(ARMADA_GEM_MMAP, armada_gem_mmap_ioctl, 0),
 69	DRM_IOCTL_DEF_DRV(ARMADA_GEM_PWRITE, armada_gem_pwrite_ioctl, 0),
 70};
 71
 72static void armada_drm_lastclose(struct drm_device *dev)
 73{
 74	armada_fbdev_lastclose(dev);
 75}
 76
 77static const struct file_operations armada_drm_fops = {
 78	.owner			= THIS_MODULE,
 79	.llseek			= no_llseek,
 80	.read			= drm_read,
 81	.poll			= drm_poll,
 82	.unlocked_ioctl		= drm_ioctl,
 83	.mmap			= drm_gem_mmap,
 84	.open			= drm_open,
 85	.release		= drm_release,
 86};
 87
 88static struct drm_driver armada_drm_driver = {
 89	.lastclose		= armada_drm_lastclose,
 90	.get_vblank_counter	= drm_vblank_no_hw_counter,
 91	.enable_vblank		= armada_drm_enable_vblank,
 92	.disable_vblank		= armada_drm_disable_vblank,
 93	.gem_free_object_unlocked = armada_gem_free_object,
 94	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
 95	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
 96	.gem_prime_export	= armada_gem_prime_export,
 97	.gem_prime_import	= armada_gem_prime_import,
 98	.dumb_create		= armada_gem_dumb_create,
 99	.dumb_map_offset	= armada_gem_dumb_map_offset,
100	.dumb_destroy		= armada_gem_dumb_destroy,
101	.gem_vm_ops		= &armada_gem_vm_ops,
102	.major			= 1,
103	.minor			= 0,
104	.name			= "armada-drm",
105	.desc			= "Armada SoC DRM",
106	.date			= "20120730",
107	.driver_features	= DRIVER_GEM | DRIVER_MODESET |
108				  DRIVER_PRIME,
109	.ioctls			= armada_ioctls,
110	.fops			= &armada_drm_fops,
111};
112
113static int armada_drm_bind(struct device *dev)
114{
115	struct armada_private *priv;
116	struct resource *mem = NULL;
117	int ret, n;
118
119	for (n = 0; ; n++) {
120		struct resource *r = platform_get_resource(to_platform_device(dev),
121							   IORESOURCE_MEM, n);
122		if (!r)
123			break;
124
125		/* Resources above 64K are graphics memory */
126		if (resource_size(r) > SZ_64K)
127			mem = r;
128		else
129			return -EINVAL;
130	}
131
132	if (!mem)
133		return -ENXIO;
134
135	if (!devm_request_mem_region(dev, mem->start, resource_size(mem),
136				     "armada-drm"))
137		return -EBUSY;
138
139	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
140	if (!priv)
141		return -ENOMEM;
142
143	/*
144	 * The drm_device structure must be at the start of
145	 * armada_private for drm_dev_unref() to work correctly.
146	 */
147	BUILD_BUG_ON(offsetof(struct armada_private, drm) != 0);
148
149	ret = drm_dev_init(&priv->drm, &armada_drm_driver, dev);
150	if (ret) {
151		dev_err(dev, "[" DRM_NAME ":%s] drm_dev_init failed: %d\n",
152			__func__, ret);
153		kfree(priv);
154		return ret;
155	}
156
157	priv->drm.platformdev = to_platform_device(dev);
158	priv->drm.dev_private = priv;
159
160	platform_set_drvdata(priv->drm.platformdev, &priv->drm);
161
162	INIT_WORK(&priv->fb_unref_work, armada_drm_unref_work);
163	INIT_KFIFO(priv->fb_unref);
164
165	/* Mode setting support */
166	drm_mode_config_init(&priv->drm);
167	priv->drm.mode_config.min_width = 320;
168	priv->drm.mode_config.min_height = 200;
169
170	/*
171	 * With vscale enabled, the maximum width is 1920 due to the
172	 * 1920 by 3 lines RAM
173	 */
174	priv->drm.mode_config.max_width = 1920;
175	priv->drm.mode_config.max_height = 2048;
176
177	priv->drm.mode_config.preferred_depth = 24;
178	priv->drm.mode_config.funcs = &armada_drm_mode_config_funcs;
179	drm_mm_init(&priv->linear, mem->start, resource_size(mem));
180	mutex_init(&priv->linear_lock);
181
182	ret = component_bind_all(dev, &priv->drm);
183	if (ret)
184		goto err_kms;
185
186	ret = drm_vblank_init(&priv->drm, priv->drm.mode_config.num_crtc);
187	if (ret)
188		goto err_comp;
189
190	priv->drm.irq_enabled = true;
191
192	ret = armada_fbdev_init(&priv->drm);
193	if (ret)
194		goto err_comp;
195
196	drm_kms_helper_poll_init(&priv->drm);
197
198	ret = drm_dev_register(&priv->drm, 0);
199	if (ret)
200		goto err_poll;
201
202#ifdef CONFIG_DEBUG_FS
203	armada_drm_debugfs_init(priv->drm.primary);
204#endif
205
206	DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
207		 armada_drm_driver.name, armada_drm_driver.major,
208		 armada_drm_driver.minor, armada_drm_driver.patchlevel,
209		 armada_drm_driver.date, dev_name(dev),
210		 priv->drm.primary->index);
211
212	return 0;
213
214 err_poll:
215	drm_kms_helper_poll_fini(&priv->drm);
216	armada_fbdev_fini(&priv->drm);
217 err_comp:
218	component_unbind_all(dev, &priv->drm);
219 err_kms:
220	drm_mode_config_cleanup(&priv->drm);
221	drm_mm_takedown(&priv->linear);
222	flush_work(&priv->fb_unref_work);
223	drm_dev_unref(&priv->drm);
224	return ret;
225}
226
227static void armada_drm_unbind(struct device *dev)
228{
229	struct drm_device *drm = dev_get_drvdata(dev);
230	struct armada_private *priv = drm->dev_private;
231
232	drm_kms_helper_poll_fini(&priv->drm);
233	armada_fbdev_fini(&priv->drm);
234
235#ifdef CONFIG_DEBUG_FS
236	armada_drm_debugfs_cleanup(priv->drm.primary);
237#endif
238	drm_dev_unregister(&priv->drm);
239
240	component_unbind_all(dev, &priv->drm);
241
242	drm_mode_config_cleanup(&priv->drm);
243	drm_mm_takedown(&priv->linear);
244	flush_work(&priv->fb_unref_work);
245
246	drm_dev_unref(&priv->drm);
247}
248
249static int compare_of(struct device *dev, void *data)
250{
251	return dev->of_node == data;
252}
253
254static int compare_dev_name(struct device *dev, void *data)
255{
256	const char *name = data;
257	return !strcmp(dev_name(dev), name);
258}
259
260static void armada_add_endpoints(struct device *dev,
261	struct component_match **match, struct device_node *port)
262{
263	struct device_node *ep, *remote;
264
265	for_each_child_of_node(port, ep) {
266		remote = of_graph_get_remote_port_parent(ep);
267		if (!remote || !of_device_is_available(remote)) {
268			of_node_put(remote);
269			continue;
270		} else if (!of_device_is_available(remote->parent)) {
271			dev_warn(dev, "parent device of %s is not available\n",
272				 remote->full_name);
273			of_node_put(remote);
274			continue;
275		}
276
277		drm_of_component_match_add(dev, match, compare_of, remote);
278		of_node_put(remote);
279	}
280}
281
282static const struct component_master_ops armada_master_ops = {
283	.bind = armada_drm_bind,
284	.unbind = armada_drm_unbind,
285};
286
287static int armada_drm_probe(struct platform_device *pdev)
288{
289	struct component_match *match = NULL;
290	struct device *dev = &pdev->dev;
291	int ret;
292
293	ret = drm_of_component_probe(dev, compare_dev_name, &armada_master_ops);
294	if (ret != -EINVAL)
295		return ret;
296
297	if (dev->platform_data) {
298		char **devices = dev->platform_data;
299		struct device_node *port;
300		struct device *d;
301		int i;
302
303		for (i = 0; devices[i]; i++)
304			component_match_add(dev, &match, compare_dev_name,
305					    devices[i]);
306
307		if (i == 0) {
308			dev_err(dev, "missing 'ports' property\n");
309			return -ENODEV;
310		}
311
312		for (i = 0; devices[i]; i++) {
313			d = bus_find_device_by_name(&platform_bus_type, NULL,
314						    devices[i]);
315			if (d && d->of_node) {
316				for_each_child_of_node(d->of_node, port)
317					armada_add_endpoints(dev, &match, port);
318			}
319			put_device(d);
320		}
321	}
322
323	return component_master_add_with_match(&pdev->dev, &armada_master_ops,
324					       match);
325}
326
327static int armada_drm_remove(struct platform_device *pdev)
328{
329	component_master_del(&pdev->dev, &armada_master_ops);
330	return 0;
331}
332
333static const struct platform_device_id armada_drm_platform_ids[] = {
334	{
335		.name		= "armada-drm",
336	}, {
337		.name		= "armada-510-drm",
338	},
339	{ },
340};
341MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
342
343static struct platform_driver armada_drm_platform_driver = {
344	.probe	= armada_drm_probe,
345	.remove	= armada_drm_remove,
346	.driver	= {
347		.name	= "armada-drm",
348	},
349	.id_table = armada_drm_platform_ids,
350};
351
352static int __init armada_drm_init(void)
353{
354	int ret;
355
356	armada_drm_driver.num_ioctls = ARRAY_SIZE(armada_ioctls);
357
358	ret = platform_driver_register(&armada_lcd_platform_driver);
359	if (ret)
360		return ret;
361	ret = platform_driver_register(&armada_drm_platform_driver);
362	if (ret)
363		platform_driver_unregister(&armada_lcd_platform_driver);
364	return ret;
365}
366module_init(armada_drm_init);
367
368static void __exit armada_drm_exit(void)
369{
370	platform_driver_unregister(&armada_drm_platform_driver);
371	platform_driver_unregister(&armada_lcd_platform_driver);
372}
373module_exit(armada_drm_exit);
374
375MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>");
376MODULE_DESCRIPTION("Armada DRM Driver");
377MODULE_LICENSE("GPL");
378MODULE_ALIAS("platform:armada-drm");