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 "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 #ifdef CONFIG_DRM_ARMADA_TDA1998X
22 #include <drm/i2c/tda998x.h>
23 #include "armada_slave.h"
24 
25 static struct tda998x_encoder_params params = {
26 	/* With 0x24, there is no translation between vp_out and int_vp
27 	FB	LCD out	Pins	VIP	Int Vp
28 	R:23:16	R:7:0	VPC7:0	7:0	7:0[R]
29 	G:15:8	G:15:8	VPB7:0	23:16	23:16[G]
30 	B:7:0	B:23:16	VPA7:0	15:8	15:8[B]
31 	*/
32 	.swap_a = 2,
33 	.swap_b = 3,
34 	.swap_c = 4,
35 	.swap_d = 5,
36 	.swap_e = 0,
37 	.swap_f = 1,
38 	.audio_cfg = BIT(2),
39 	.audio_frame[1] = 1,
40 	.audio_format = AFMT_SPDIF,
41 	.audio_sample_rate = 44100,
42 };
43 
44 static const struct armada_drm_slave_config tda19988_config = {
45 	.i2c_adapter_id = 0,
46 	.crtcs = 1 << 0, /* Only LCD0 at the moment */
47 	.polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT,
48 	.interlace_allowed = true,
49 	.info = {
50 		.type = "tda998x",
51 		.addr = 0x70,
52 		.platform_data = &params,
53 	},
54 };
55 #endif
56 
57 static bool is_componentized(struct device *dev)
58 {
59 	return dev->of_node || dev->platform_data;
60 }
61 
62 static void armada_drm_unref_work(struct work_struct *work)
63 {
64 	struct armada_private *priv =
65 		container_of(work, struct armada_private, fb_unref_work);
66 	struct drm_framebuffer *fb;
67 
68 	while (kfifo_get(&priv->fb_unref, &fb))
69 		drm_framebuffer_unreference(fb);
70 }
71 
72 /* Must be called with dev->event_lock held */
73 void __armada_drm_queue_unref_work(struct drm_device *dev,
74 	struct drm_framebuffer *fb)
75 {
76 	struct armada_private *priv = dev->dev_private;
77 
78 	WARN_ON(!kfifo_put(&priv->fb_unref, fb));
79 	schedule_work(&priv->fb_unref_work);
80 }
81 
82 void armada_drm_queue_unref_work(struct drm_device *dev,
83 	struct drm_framebuffer *fb)
84 {
85 	unsigned long flags;
86 
87 	spin_lock_irqsave(&dev->event_lock, flags);
88 	__armada_drm_queue_unref_work(dev, fb);
89 	spin_unlock_irqrestore(&dev->event_lock, flags);
90 }
91 
92 static int armada_drm_load(struct drm_device *dev, unsigned long flags)
93 {
94 	const struct platform_device_id *id;
95 	const struct armada_variant *variant;
96 	struct armada_private *priv;
97 	struct resource *res[ARRAY_SIZE(priv->dcrtc)];
98 	struct resource *mem = NULL;
99 	int ret, n, i;
100 
101 	memset(res, 0, sizeof(res));
102 
103 	for (n = i = 0; ; n++) {
104 		struct resource *r = platform_get_resource(dev->platformdev,
105 							   IORESOURCE_MEM, n);
106 		if (!r)
107 			break;
108 
109 		/* Resources above 64K are graphics memory */
110 		if (resource_size(r) > SZ_64K)
111 			mem = r;
112 		else if (i < ARRAY_SIZE(priv->dcrtc))
113 			res[i++] = r;
114 		else
115 			return -EINVAL;
116 	}
117 
118 	if (!mem)
119 		return -ENXIO;
120 
121 	if (!devm_request_mem_region(dev->dev, mem->start,
122 			resource_size(mem), "armada-drm"))
123 		return -EBUSY;
124 
125 	priv = devm_kzalloc(dev->dev, sizeof(*priv), GFP_KERNEL);
126 	if (!priv) {
127 		DRM_ERROR("failed to allocate private\n");
128 		return -ENOMEM;
129 	}
130 
131 	platform_set_drvdata(dev->platformdev, dev);
132 	dev->dev_private = priv;
133 
134 	/* Get the implementation specific driver data. */
135 	id = platform_get_device_id(dev->platformdev);
136 	if (!id)
137 		return -ENXIO;
138 
139 	variant = (const struct armada_variant *)id->driver_data;
140 
141 	INIT_WORK(&priv->fb_unref_work, armada_drm_unref_work);
142 	INIT_KFIFO(priv->fb_unref);
143 
144 	/* Mode setting support */
145 	drm_mode_config_init(dev);
146 	dev->mode_config.min_width = 320;
147 	dev->mode_config.min_height = 200;
148 
149 	/*
150 	 * With vscale enabled, the maximum width is 1920 due to the
151 	 * 1920 by 3 lines RAM
152 	 */
153 	dev->mode_config.max_width = 1920;
154 	dev->mode_config.max_height = 2048;
155 
156 	dev->mode_config.preferred_depth = 24;
157 	dev->mode_config.funcs = &armada_drm_mode_config_funcs;
158 	drm_mm_init(&priv->linear, mem->start, resource_size(mem));
159 
160 	/* Create all LCD controllers */
161 	for (n = 0; n < ARRAY_SIZE(priv->dcrtc); n++) {
162 		int irq;
163 
164 		if (!res[n])
165 			break;
166 
167 		irq = platform_get_irq(dev->platformdev, n);
168 		if (irq < 0)
169 			goto err_kms;
170 
171 		ret = armada_drm_crtc_create(dev, dev->dev, res[n], irq,
172 					     variant, NULL);
173 		if (ret)
174 			goto err_kms;
175 	}
176 
177 	if (is_componentized(dev->dev)) {
178 		ret = component_bind_all(dev->dev, dev);
179 		if (ret)
180 			goto err_kms;
181 	} else {
182 #ifdef CONFIG_DRM_ARMADA_TDA1998X
183 		ret = armada_drm_connector_slave_create(dev, &tda19988_config);
184 		if (ret)
185 			goto err_kms;
186 #endif
187 	}
188 
189 	ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
190 	if (ret)
191 		goto err_comp;
192 
193 	dev->vblank_disable_allowed = 1;
194 
195 	ret = armada_fbdev_init(dev);
196 	if (ret)
197 		goto err_comp;
198 
199 	drm_kms_helper_poll_init(dev);
200 
201 	return 0;
202 
203  err_comp:
204 	if (is_componentized(dev->dev))
205 		component_unbind_all(dev->dev, dev);
206  err_kms:
207 	drm_mode_config_cleanup(dev);
208 	drm_mm_takedown(&priv->linear);
209 	flush_work(&priv->fb_unref_work);
210 
211 	return ret;
212 }
213 
214 static int armada_drm_unload(struct drm_device *dev)
215 {
216 	struct armada_private *priv = dev->dev_private;
217 
218 	drm_kms_helper_poll_fini(dev);
219 	armada_fbdev_fini(dev);
220 
221 	if (is_componentized(dev->dev))
222 		component_unbind_all(dev->dev, dev);
223 
224 	drm_mode_config_cleanup(dev);
225 	drm_mm_takedown(&priv->linear);
226 	flush_work(&priv->fb_unref_work);
227 	dev->dev_private = NULL;
228 
229 	return 0;
230 }
231 
232 void armada_drm_vbl_event_add(struct armada_crtc *dcrtc,
233 	struct armada_vbl_event *evt)
234 {
235 	unsigned long flags;
236 
237 	spin_lock_irqsave(&dcrtc->irq_lock, flags);
238 	if (list_empty(&evt->node)) {
239 		list_add_tail(&evt->node, &dcrtc->vbl_list);
240 
241 		drm_vblank_get(dcrtc->crtc.dev, dcrtc->num);
242 	}
243 	spin_unlock_irqrestore(&dcrtc->irq_lock, flags);
244 }
245 
246 void armada_drm_vbl_event_remove(struct armada_crtc *dcrtc,
247 	struct armada_vbl_event *evt)
248 {
249 	if (!list_empty(&evt->node)) {
250 		list_del_init(&evt->node);
251 		drm_vblank_put(dcrtc->crtc.dev, dcrtc->num);
252 	}
253 }
254 
255 void armada_drm_vbl_event_remove_unlocked(struct armada_crtc *dcrtc,
256 	struct armada_vbl_event *evt)
257 {
258 	unsigned long flags;
259 
260 	spin_lock_irqsave(&dcrtc->irq_lock, flags);
261 	armada_drm_vbl_event_remove(dcrtc, evt);
262 	spin_unlock_irqrestore(&dcrtc->irq_lock, flags);
263 }
264 
265 /* These are called under the vbl_lock. */
266 static int armada_drm_enable_vblank(struct drm_device *dev, int crtc)
267 {
268 	struct armada_private *priv = dev->dev_private;
269 	armada_drm_crtc_enable_irq(priv->dcrtc[crtc], VSYNC_IRQ_ENA);
270 	return 0;
271 }
272 
273 static void armada_drm_disable_vblank(struct drm_device *dev, int crtc)
274 {
275 	struct armada_private *priv = dev->dev_private;
276 	armada_drm_crtc_disable_irq(priv->dcrtc[crtc], VSYNC_IRQ_ENA);
277 }
278 
279 static struct drm_ioctl_desc armada_ioctls[] = {
280 	DRM_IOCTL_DEF_DRV(ARMADA_GEM_CREATE, armada_gem_create_ioctl,
281 		DRM_UNLOCKED),
282 	DRM_IOCTL_DEF_DRV(ARMADA_GEM_MMAP, armada_gem_mmap_ioctl,
283 		DRM_UNLOCKED),
284 	DRM_IOCTL_DEF_DRV(ARMADA_GEM_PWRITE, armada_gem_pwrite_ioctl,
285 		DRM_UNLOCKED),
286 };
287 
288 static void armada_drm_lastclose(struct drm_device *dev)
289 {
290 	armada_fbdev_lastclose(dev);
291 }
292 
293 static const struct file_operations armada_drm_fops = {
294 	.owner			= THIS_MODULE,
295 	.llseek			= no_llseek,
296 	.read			= drm_read,
297 	.poll			= drm_poll,
298 	.unlocked_ioctl		= drm_ioctl,
299 	.mmap			= drm_gem_mmap,
300 	.open			= drm_open,
301 	.release		= drm_release,
302 };
303 
304 static struct drm_driver armada_drm_driver = {
305 	.load			= armada_drm_load,
306 	.open			= NULL,
307 	.preclose		= NULL,
308 	.postclose		= NULL,
309 	.lastclose		= armada_drm_lastclose,
310 	.unload			= armada_drm_unload,
311 	.set_busid		= drm_platform_set_busid,
312 	.get_vblank_counter	= drm_vblank_count,
313 	.enable_vblank		= armada_drm_enable_vblank,
314 	.disable_vblank		= armada_drm_disable_vblank,
315 #ifdef CONFIG_DEBUG_FS
316 	.debugfs_init		= armada_drm_debugfs_init,
317 	.debugfs_cleanup	= armada_drm_debugfs_cleanup,
318 #endif
319 	.gem_free_object	= armada_gem_free_object,
320 	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
321 	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
322 	.gem_prime_export	= armada_gem_prime_export,
323 	.gem_prime_import	= armada_gem_prime_import,
324 	.dumb_create		= armada_gem_dumb_create,
325 	.dumb_map_offset	= armada_gem_dumb_map_offset,
326 	.dumb_destroy		= armada_gem_dumb_destroy,
327 	.gem_vm_ops		= &armada_gem_vm_ops,
328 	.major			= 1,
329 	.minor			= 0,
330 	.name			= "armada-drm",
331 	.desc			= "Armada SoC DRM",
332 	.date			= "20120730",
333 	.driver_features	= DRIVER_GEM | DRIVER_MODESET |
334 				  DRIVER_PRIME,
335 	.ioctls			= armada_ioctls,
336 	.fops			= &armada_drm_fops,
337 };
338 
339 static int armada_drm_bind(struct device *dev)
340 {
341 	return drm_platform_init(&armada_drm_driver, to_platform_device(dev));
342 }
343 
344 static void armada_drm_unbind(struct device *dev)
345 {
346 	drm_put_dev(dev_get_drvdata(dev));
347 }
348 
349 static int compare_of(struct device *dev, void *data)
350 {
351 	return dev->of_node == data;
352 }
353 
354 static int compare_dev_name(struct device *dev, void *data)
355 {
356 	const char *name = data;
357 	return !strcmp(dev_name(dev), name);
358 }
359 
360 static void armada_add_endpoints(struct device *dev,
361 	struct component_match **match, struct device_node *port)
362 {
363 	struct device_node *ep, *remote;
364 
365 	for_each_child_of_node(port, ep) {
366 		remote = of_graph_get_remote_port_parent(ep);
367 		if (!remote || !of_device_is_available(remote)) {
368 			of_node_put(remote);
369 			continue;
370 		} else if (!of_device_is_available(remote->parent)) {
371 			dev_warn(dev, "parent device of %s is not available\n",
372 				 remote->full_name);
373 			of_node_put(remote);
374 			continue;
375 		}
376 
377 		component_match_add(dev, match, compare_of, remote);
378 		of_node_put(remote);
379 	}
380 }
381 
382 static int armada_drm_find_components(struct device *dev,
383 	struct component_match **match)
384 {
385 	struct device_node *port;
386 	int i;
387 
388 	if (dev->of_node) {
389 		struct device_node *np = dev->of_node;
390 
391 		for (i = 0; ; i++) {
392 			port = of_parse_phandle(np, "ports", i);
393 			if (!port)
394 				break;
395 
396 			component_match_add(dev, match, compare_of, port);
397 			of_node_put(port);
398 		}
399 
400 		if (i == 0) {
401 			dev_err(dev, "missing 'ports' property\n");
402 			return -ENODEV;
403 		}
404 
405 		for (i = 0; ; i++) {
406 			port = of_parse_phandle(np, "ports", i);
407 			if (!port)
408 				break;
409 
410 			armada_add_endpoints(dev, match, port);
411 			of_node_put(port);
412 		}
413 	} else if (dev->platform_data) {
414 		char **devices = dev->platform_data;
415 		struct device *d;
416 
417 		for (i = 0; devices[i]; i++)
418 			component_match_add(dev, match, compare_dev_name,
419 					    devices[i]);
420 
421 		if (i == 0) {
422 			dev_err(dev, "missing 'ports' property\n");
423 			return -ENODEV;
424 		}
425 
426 		for (i = 0; devices[i]; i++) {
427 			d = bus_find_device_by_name(&platform_bus_type, NULL,
428 					devices[i]);
429 			if (d && d->of_node) {
430 				for_each_child_of_node(d->of_node, port)
431 					armada_add_endpoints(dev, match, port);
432 			}
433 			put_device(d);
434 		}
435 	}
436 
437 	return 0;
438 }
439 
440 static const struct component_master_ops armada_master_ops = {
441 	.bind = armada_drm_bind,
442 	.unbind = armada_drm_unbind,
443 };
444 
445 static int armada_drm_probe(struct platform_device *pdev)
446 {
447 	if (is_componentized(&pdev->dev)) {
448 		struct component_match *match = NULL;
449 		int ret;
450 
451 		ret = armada_drm_find_components(&pdev->dev, &match);
452 		if (ret < 0)
453 			return ret;
454 
455 		return component_master_add_with_match(&pdev->dev,
456 				&armada_master_ops, match);
457 	} else {
458 		return drm_platform_init(&armada_drm_driver, pdev);
459 	}
460 }
461 
462 static int armada_drm_remove(struct platform_device *pdev)
463 {
464 	if (is_componentized(&pdev->dev))
465 		component_master_del(&pdev->dev, &armada_master_ops);
466 	else
467 		drm_put_dev(platform_get_drvdata(pdev));
468 	return 0;
469 }
470 
471 static const struct platform_device_id armada_drm_platform_ids[] = {
472 	{
473 		.name		= "armada-drm",
474 		.driver_data	= (unsigned long)&armada510_ops,
475 	}, {
476 		.name		= "armada-510-drm",
477 		.driver_data	= (unsigned long)&armada510_ops,
478 	},
479 	{ },
480 };
481 MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
482 
483 static struct platform_driver armada_drm_platform_driver = {
484 	.probe	= armada_drm_probe,
485 	.remove	= armada_drm_remove,
486 	.driver	= {
487 		.name	= "armada-drm",
488 		.owner	= THIS_MODULE,
489 	},
490 	.id_table = armada_drm_platform_ids,
491 };
492 
493 static int __init armada_drm_init(void)
494 {
495 	int ret;
496 
497 	armada_drm_driver.num_ioctls = ARRAY_SIZE(armada_ioctls);
498 
499 	ret = platform_driver_register(&armada_lcd_platform_driver);
500 	if (ret)
501 		return ret;
502 	ret = platform_driver_register(&armada_drm_platform_driver);
503 	if (ret)
504 		platform_driver_unregister(&armada_lcd_platform_driver);
505 	return ret;
506 }
507 module_init(armada_drm_init);
508 
509 static void __exit armada_drm_exit(void)
510 {
511 	platform_driver_unregister(&armada_drm_platform_driver);
512 	platform_driver_unregister(&armada_lcd_platform_driver);
513 }
514 module_exit(armada_drm_exit);
515 
516 MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>");
517 MODULE_DESCRIPTION("Armada DRM Driver");
518 MODULE_LICENSE("GPL");
519 MODULE_ALIAS("platform:armada-drm");
520