1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Copyright (C) 2015 Free Electrons
  4 * Copyright (C) 2015 NextThing Co
  5 *
  6 * Maxime Ripard <maxime.ripard@free-electrons.com>
  7 */
  8
  9#include <linux/component.h>
 10#include <linux/dma-mapping.h>
 11#include <linux/kfifo.h>
 12#include <linux/module.h>
 13#include <linux/of_graph.h>
 14#include <linux/of_reserved_mem.h>
 15#include <linux/platform_device.h>
 16
 17#include <drm/drm_aperture.h>
 18#include <drm/drm_atomic_helper.h>
 19#include <drm/drm_drv.h>
 20#include <drm/drm_fbdev_generic.h>
 21#include <drm/drm_gem_dma_helper.h>
 22#include <drm/drm_module.h>
 23#include <drm/drm_of.h>
 24#include <drm/drm_probe_helper.h>
 25#include <drm/drm_vblank.h>
 26
 27#include "sun4i_drv.h"
 28#include "sun4i_frontend.h"
 29#include "sun4i_framebuffer.h"
 30#include "sun4i_tcon.h"
 31#include "sun8i_tcon_top.h"
 32
 33static int drm_sun4i_gem_dumb_create(struct drm_file *file_priv,
 34				     struct drm_device *drm,
 35				     struct drm_mode_create_dumb *args)
 36{
 37	/* The hardware only allows even pitches for YUV buffers. */
 38	args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), 2);
 39
 40	return drm_gem_dma_dumb_create_internal(file_priv, drm, args);
 41}
 42
 43DEFINE_DRM_GEM_DMA_FOPS(sun4i_drv_fops);
 44
 45static const struct drm_driver sun4i_drv_driver = {
 46	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 47
 48	/* Generic Operations */
 49	.fops			= &sun4i_drv_fops,
 50	.name			= "sun4i-drm",
 51	.desc			= "Allwinner sun4i Display Engine",
 52	.date			= "20150629",
 53	.major			= 1,
 54	.minor			= 0,
 55
 56	/* GEM Operations */
 57	DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(drm_sun4i_gem_dumb_create),
 58};
 59
 60static int sun4i_drv_bind(struct device *dev)
 61{
 62	struct drm_device *drm;
 63	struct sun4i_drv *drv;
 64	int ret;
 65
 66	drm = drm_dev_alloc(&sun4i_drv_driver, dev);
 67	if (IS_ERR(drm))
 68		return PTR_ERR(drm);
 69
 70	drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
 71	if (!drv) {
 72		ret = -ENOMEM;
 73		goto free_drm;
 74	}
 75
 76	drm->dev_private = drv;
 77	INIT_LIST_HEAD(&drv->frontend_list);
 78	INIT_LIST_HEAD(&drv->engine_list);
 79	INIT_LIST_HEAD(&drv->tcon_list);
 80
 81	ret = of_reserved_mem_device_init(dev);
 82	if (ret && ret != -ENODEV) {
 83		dev_err(drm->dev, "Couldn't claim our memory region\n");
 84		goto free_drm;
 85	}
 86
 87	drm_mode_config_init(drm);
 88
 89	ret = component_bind_all(drm->dev, drm);
 90	if (ret) {
 91		dev_err(drm->dev, "Couldn't bind all pipelines components\n");
 92		goto cleanup_mode_config;
 93	}
 94
 95	/* drm_vblank_init calls kcalloc, which can fail */
 96	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
 97	if (ret)
 98		goto cleanup_mode_config;
 99
100	/* Remove early framebuffers (ie. simplefb) */
101	ret = drm_aperture_remove_framebuffers(false, &sun4i_drv_driver);
102	if (ret)
103		goto cleanup_mode_config;
104
105	sun4i_framebuffer_init(drm);
106
107	/* Enable connectors polling */
108	drm_kms_helper_poll_init(drm);
109
110	ret = drm_dev_register(drm, 0);
111	if (ret)
112		goto finish_poll;
113
114	drm_fbdev_generic_setup(drm, 32);
115
116	dev_set_drvdata(dev, drm);
117
118	return 0;
119
120finish_poll:
121	drm_kms_helper_poll_fini(drm);
122cleanup_mode_config:
123	drm_mode_config_cleanup(drm);
124	of_reserved_mem_device_release(dev);
125free_drm:
126	drm_dev_put(drm);
127	return ret;
128}
129
130static void sun4i_drv_unbind(struct device *dev)
131{
132	struct drm_device *drm = dev_get_drvdata(dev);
133
134	dev_set_drvdata(dev, NULL);
135	drm_dev_unregister(drm);
136	drm_kms_helper_poll_fini(drm);
137	drm_atomic_helper_shutdown(drm);
138	drm_mode_config_cleanup(drm);
139
140	component_unbind_all(dev, NULL);
141	of_reserved_mem_device_release(dev);
142
143	drm_dev_put(drm);
144}
145
146static const struct component_master_ops sun4i_drv_master_ops = {
147	.bind	= sun4i_drv_bind,
148	.unbind	= sun4i_drv_unbind,
149};
150
151static bool sun4i_drv_node_is_connector(struct device_node *node)
152{
153	return of_device_is_compatible(node, "hdmi-connector");
154}
155
156static bool sun4i_drv_node_is_frontend(struct device_node *node)
157{
158	return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
159		of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
160		of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
161		of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
162		of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") ||
163		of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") ||
164		of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend");
165}
166
167static bool sun4i_drv_node_is_deu(struct device_node *node)
168{
169	return of_device_is_compatible(node, "allwinner,sun9i-a80-deu");
170}
171
172static bool sun4i_drv_node_is_supported_frontend(struct device_node *node)
173{
174	if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND))
175		return !!of_match_node(sun4i_frontend_of_table, node);
176
177	return false;
178}
179
180static bool sun4i_drv_node_is_tcon(struct device_node *node)
181{
182	return !!of_match_node(sun4i_tcon_of_table, node);
183}
184
185static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node)
186{
187	const struct of_device_id *match;
188
189	match = of_match_node(sun4i_tcon_of_table, node);
190	if (match) {
191		struct sun4i_tcon_quirks *quirks;
192
193		quirks = (struct sun4i_tcon_quirks *)match->data;
194
195		return quirks->has_channel_0;
196	}
197
198	return false;
199}
200
201static bool sun4i_drv_node_is_tcon_top(struct device_node *node)
202{
203	return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
204		!!of_match_node(sun8i_tcon_top_of_table, node);
205}
206
207/*
208 * The encoder drivers use drm_of_find_possible_crtcs to get upstream
209 * crtcs from the device tree using of_graph. For the results to be
210 * correct, encoders must be probed/bound after _all_ crtcs have been
211 * created. The existing code uses a depth first recursive traversal
212 * of the of_graph, which means the encoders downstream of the TCON
213 * get add right after the first TCON. The second TCON or CRTC will
214 * never be properly associated with encoders connected to it.
215 *
216 * Also, in a dual display pipeline setup, both frontends can feed
217 * either backend, and both backends can feed either TCON, we want
218 * all components of the same type to be added before the next type
219 * in the pipeline. Fortunately, the pipelines are perfectly symmetric,
220 * i.e. components of the same type are at the same depth when counted
221 * from the frontend. The only exception is the third pipeline in
222 * the A80 SoC, which we do not support anyway.
223 *
224 * Hence we can use a breadth first search traversal order to add
225 * components. We do not need to check for duplicates. The component
226 * matching system handles this for us.
227 */
228struct endpoint_list {
229	DECLARE_KFIFO(fifo, struct device_node *, 16);
230};
231
232static void sun4i_drv_traverse_endpoints(struct endpoint_list *list,
233					 struct device_node *node,
234					 int port_id)
235{
236	struct device_node *ep, *remote, *port;
237
238	port = of_graph_get_port_by_id(node, port_id);
239	if (!port) {
240		DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id);
241		return;
242	}
243
244	for_each_available_child_of_node(port, ep) {
245		remote = of_graph_get_remote_port_parent(ep);
246		if (!remote) {
247			DRM_DEBUG_DRIVER("Error retrieving the output node\n");
248			continue;
249		}
250
251		if (sun4i_drv_node_is_tcon(node)) {
252			/*
253			 * TCON TOP is always probed before TCON. However, TCON
254			 * points back to TCON TOP when it is source for HDMI.
255			 * We have to skip it here to prevent infinite looping
256			 * between TCON TOP and TCON.
257			 */
258			if (sun4i_drv_node_is_tcon_top(remote)) {
259				DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n");
260				of_node_put(remote);
261				continue;
262			}
263
264			/*
265			 * If the node is our TCON with channel 0, the first
266			 * port is used for panel or bridges, and will not be
267			 * part of the component framework.
268			 */
269			if (sun4i_drv_node_is_tcon_with_ch0(node)) {
270				struct of_endpoint endpoint;
271
272				if (of_graph_parse_endpoint(ep, &endpoint)) {
273					DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
274					of_node_put(remote);
275					continue;
276				}
277
278				if (!endpoint.id) {
279					DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
280					of_node_put(remote);
281					continue;
282				}
283			}
284		}
285
286		kfifo_put(&list->fifo, remote);
287	}
288}
289
290static int sun4i_drv_add_endpoints(struct device *dev,
291				   struct endpoint_list *list,
292				   struct component_match **match,
293				   struct device_node *node)
294{
295	int count = 0;
296
297	/*
298	 * The frontend has been disabled in some of our old device
299	 * trees. If we find a node that is the frontend and is
300	 * disabled, we should just follow through and parse its
301	 * child, but without adding it to the component list.
302	 * Otherwise, we obviously want to add it to the list.
303	 */
304	if (!sun4i_drv_node_is_frontend(node) &&
305	    !of_device_is_available(node))
306		return 0;
307
308	/*
309	 * The connectors will be the last nodes in our pipeline, we
310	 * can just bail out.
311	 */
312	if (sun4i_drv_node_is_connector(node))
313		return 0;
314
315	/*
316	 * If the device is either just a regular device, or an
317	 * enabled frontend supported by the driver, we add it to our
318	 * component list.
319	 */
320	if (!(sun4i_drv_node_is_frontend(node) ||
321	      sun4i_drv_node_is_deu(node)) ||
322	    (sun4i_drv_node_is_supported_frontend(node) &&
323	     of_device_is_available(node))) {
324		/* Add current component */
325		DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
326		drm_of_component_match_add(dev, match, component_compare_of, node);
327		count++;
328	}
329
330	/* each node has at least one output */
331	sun4i_drv_traverse_endpoints(list, node, 1);
332
333	/* TCON TOP has second and third output */
334	if (sun4i_drv_node_is_tcon_top(node)) {
335		sun4i_drv_traverse_endpoints(list, node, 3);
336		sun4i_drv_traverse_endpoints(list, node, 5);
337	}
338
339	return count;
340}
341
342#ifdef CONFIG_PM_SLEEP
343static int sun4i_drv_drm_sys_suspend(struct device *dev)
344{
345	struct drm_device *drm = dev_get_drvdata(dev);
346
347	return drm_mode_config_helper_suspend(drm);
348}
349
350static int sun4i_drv_drm_sys_resume(struct device *dev)
351{
352	struct drm_device *drm = dev_get_drvdata(dev);
353
354	return drm_mode_config_helper_resume(drm);
355}
356#endif
357
358static const struct dev_pm_ops sun4i_drv_drm_pm_ops = {
359	SET_SYSTEM_SLEEP_PM_OPS(sun4i_drv_drm_sys_suspend,
360				sun4i_drv_drm_sys_resume)
361};
362
363static int sun4i_drv_probe(struct platform_device *pdev)
364{
365	struct component_match *match = NULL;
366	struct device_node *np = pdev->dev.of_node, *endpoint;
367	struct endpoint_list list;
368	int i, ret, count = 0;
369
370	INIT_KFIFO(list.fifo);
371
372	/*
373	 * DE2 and DE3 cores actually supports 40-bit addresses, but
374	 * driver does not.
375	 */
376	dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
377	dma_set_max_seg_size(&pdev->dev, UINT_MAX);
378
379	for (i = 0;; i++) {
380		struct device_node *pipeline = of_parse_phandle(np,
381								"allwinner,pipelines",
382								i);
383		if (!pipeline)
384			break;
385
386		kfifo_put(&list.fifo, pipeline);
387	}
388
389	while (kfifo_get(&list.fifo, &endpoint)) {
390		/* process this endpoint */
391		ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
392					      endpoint);
393
394		/* sun4i_drv_add_endpoints can fail to allocate memory */
395		if (ret < 0)
396			return ret;
397
398		count += ret;
399	}
400
401	if (count)
402		return component_master_add_with_match(&pdev->dev,
403						       &sun4i_drv_master_ops,
404						       match);
405	else
406		return 0;
407}
408
409static int sun4i_drv_remove(struct platform_device *pdev)
410{
411	component_master_del(&pdev->dev, &sun4i_drv_master_ops);
412
413	return 0;
414}
415
416static const struct of_device_id sun4i_drv_of_table[] = {
417	{ .compatible = "allwinner,sun4i-a10-display-engine" },
418	{ .compatible = "allwinner,sun5i-a10s-display-engine" },
419	{ .compatible = "allwinner,sun5i-a13-display-engine" },
420	{ .compatible = "allwinner,sun6i-a31-display-engine" },
421	{ .compatible = "allwinner,sun6i-a31s-display-engine" },
422	{ .compatible = "allwinner,sun7i-a20-display-engine" },
423	{ .compatible = "allwinner,sun8i-a23-display-engine" },
424	{ .compatible = "allwinner,sun8i-a33-display-engine" },
425	{ .compatible = "allwinner,sun8i-a83t-display-engine" },
426	{ .compatible = "allwinner,sun8i-h3-display-engine" },
427	{ .compatible = "allwinner,sun8i-r40-display-engine" },
428	{ .compatible = "allwinner,sun8i-v3s-display-engine" },
429	{ .compatible = "allwinner,sun9i-a80-display-engine" },
430	{ .compatible = "allwinner,sun20i-d1-display-engine" },
431	{ .compatible = "allwinner,sun50i-a64-display-engine" },
432	{ .compatible = "allwinner,sun50i-h6-display-engine" },
433	{ }
434};
435MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
436
437static struct platform_driver sun4i_drv_platform_driver = {
438	.probe		= sun4i_drv_probe,
439	.remove		= sun4i_drv_remove,
440	.driver		= {
441		.name		= "sun4i-drm",
442		.of_match_table	= sun4i_drv_of_table,
443		.pm = &sun4i_drv_drm_pm_ops,
444	},
445};
446drm_module_platform_driver(sun4i_drv_platform_driver);
447
448MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
449MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
450MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
451MODULE_LICENSE("GPL");