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