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