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  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
  4 * Author:Mark Yao <mark.yao@rock-chips.com>
  5 *
  6 * based on exynos_drm_drv.c
  7 */
  8
  9#include <linux/dma-mapping.h>
 10#include <linux/dma-iommu.h>
 11#include <linux/pm_runtime.h>
 12#include <linux/module.h>
 13#include <linux/of_graph.h>
 14#include <linux/of_platform.h>
 15#include <linux/component.h>
 16#include <linux/console.h>
 17#include <linux/iommu.h>
 18
 19#include <drm/drm_drv.h>
 20#include <drm/drm_fb_helper.h>
 21#include <drm/drm_gem_cma_helper.h>
 22#include <drm/drm_of.h>
 23#include <drm/drm_probe_helper.h>
 24#include <drm/drm_vblank.h>
 25
 26#include "rockchip_drm_drv.h"
 27#include "rockchip_drm_fb.h"
 28#include "rockchip_drm_fbdev.h"
 29#include "rockchip_drm_gem.h"
 30
 31#define DRIVER_NAME	"rockchip"
 32#define DRIVER_DESC	"RockChip Soc DRM"
 33#define DRIVER_DATE	"20140818"
 34#define DRIVER_MAJOR	1
 35#define DRIVER_MINOR	0
 36
 37static bool is_support_iommu = true;
 38static struct drm_driver rockchip_drm_driver;
 39
 40/*
 41 * Attach a (component) device to the shared drm dma mapping from master drm
 42 * device.  This is used by the VOPs to map GEM buffers to a common DMA
 43 * mapping.
 44 */
 45int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
 46				   struct device *dev)
 47{
 48	struct rockchip_drm_private *private = drm_dev->dev_private;
 49	int ret;
 50
 51	if (!is_support_iommu)
 52		return 0;
 53
 54	ret = iommu_attach_device(private->domain, dev);
 55	if (ret) {
 56		DRM_DEV_ERROR(dev, "Failed to attach iommu device\n");
 57		return ret;
 58	}
 59
 60	return 0;
 61}
 62
 63void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
 64				    struct device *dev)
 65{
 66	struct rockchip_drm_private *private = drm_dev->dev_private;
 67	struct iommu_domain *domain = private->domain;
 68
 69	if (!is_support_iommu)
 70		return;
 71
 72	iommu_detach_device(domain, dev);
 73}
 74
 75static int rockchip_drm_init_iommu(struct drm_device *drm_dev)
 76{
 77	struct rockchip_drm_private *private = drm_dev->dev_private;
 78	struct iommu_domain_geometry *geometry;
 79	u64 start, end;
 80
 81	if (!is_support_iommu)
 82		return 0;
 83
 84	private->domain = iommu_domain_alloc(&platform_bus_type);
 85	if (!private->domain)
 86		return -ENOMEM;
 87
 88	geometry = &private->domain->geometry;
 89	start = geometry->aperture_start;
 90	end = geometry->aperture_end;
 91
 92	DRM_DEBUG("IOMMU context initialized (aperture: %#llx-%#llx)\n",
 93		  start, end);
 94	drm_mm_init(&private->mm, start, end - start + 1);
 95	mutex_init(&private->mm_lock);
 96
 97	return 0;
 98}
 99
100static void rockchip_iommu_cleanup(struct drm_device *drm_dev)
101{
102	struct rockchip_drm_private *private = drm_dev->dev_private;
103
104	if (!is_support_iommu)
105		return;
106
107	drm_mm_takedown(&private->mm);
108	iommu_domain_free(private->domain);
109}
110
111static int rockchip_drm_bind(struct device *dev)
112{
113	struct drm_device *drm_dev;
114	struct rockchip_drm_private *private;
115	int ret;
116
117	drm_dev = drm_dev_alloc(&rockchip_drm_driver, dev);
118	if (IS_ERR(drm_dev))
119		return PTR_ERR(drm_dev);
120
121	dev_set_drvdata(dev, drm_dev);
122
123	private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
124	if (!private) {
125		ret = -ENOMEM;
126		goto err_free;
127	}
128
129	drm_dev->dev_private = private;
130
131	INIT_LIST_HEAD(&private->psr_list);
132	mutex_init(&private->psr_list_lock);
133
134	ret = rockchip_drm_init_iommu(drm_dev);
135	if (ret)
136		goto err_free;
137
138	ret = drmm_mode_config_init(drm_dev);
139	if (ret)
140		goto err_iommu_cleanup;
141
142	rockchip_drm_mode_config_init(drm_dev);
143
144	/* Try to bind all sub drivers. */
145	ret = component_bind_all(dev, drm_dev);
146	if (ret)
147		goto err_iommu_cleanup;
148
149	ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
150	if (ret)
151		goto err_unbind_all;
152
153	drm_mode_config_reset(drm_dev);
154
155	/*
156	 * enable drm irq mode.
157	 * - with irq_enabled = true, we can use the vblank feature.
158	 */
159	drm_dev->irq_enabled = true;
160
161	ret = rockchip_drm_fbdev_init(drm_dev);
162	if (ret)
163		goto err_unbind_all;
164
165	/* init kms poll for handling hpd */
166	drm_kms_helper_poll_init(drm_dev);
167
168	ret = drm_dev_register(drm_dev, 0);
169	if (ret)
170		goto err_kms_helper_poll_fini;
171
172	return 0;
173err_kms_helper_poll_fini:
174	drm_kms_helper_poll_fini(drm_dev);
175	rockchip_drm_fbdev_fini(drm_dev);
176err_unbind_all:
177	component_unbind_all(dev, drm_dev);
178err_iommu_cleanup:
179	rockchip_iommu_cleanup(drm_dev);
180err_free:
181	drm_dev_put(drm_dev);
182	return ret;
183}
184
185static void rockchip_drm_unbind(struct device *dev)
186{
187	struct drm_device *drm_dev = dev_get_drvdata(dev);
188
189	drm_dev_unregister(drm_dev);
190
191	rockchip_drm_fbdev_fini(drm_dev);
192	drm_kms_helper_poll_fini(drm_dev);
193
194	drm_atomic_helper_shutdown(drm_dev);
195	component_unbind_all(dev, drm_dev);
196	rockchip_iommu_cleanup(drm_dev);
197
198	drm_dev_put(drm_dev);
199}
200
201static const struct file_operations rockchip_drm_driver_fops = {
202	.owner = THIS_MODULE,
203	.open = drm_open,
204	.mmap = rockchip_gem_mmap,
205	.poll = drm_poll,
206	.read = drm_read,
207	.unlocked_ioctl = drm_ioctl,
208	.compat_ioctl = drm_compat_ioctl,
209	.release = drm_release,
210};
211
212static struct drm_driver rockchip_drm_driver = {
213	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
214	.lastclose		= drm_fb_helper_lastclose,
215	.gem_vm_ops		= &drm_gem_cma_vm_ops,
216	.gem_free_object_unlocked = rockchip_gem_free_object,
217	.dumb_create		= rockchip_gem_dumb_create,
218	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
219	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
220	.gem_prime_get_sg_table	= rockchip_gem_prime_get_sg_table,
221	.gem_prime_import_sg_table	= rockchip_gem_prime_import_sg_table,
222	.gem_prime_vmap		= rockchip_gem_prime_vmap,
223	.gem_prime_vunmap	= rockchip_gem_prime_vunmap,
224	.gem_prime_mmap		= rockchip_gem_mmap_buf,
225	.fops			= &rockchip_drm_driver_fops,
226	.name	= DRIVER_NAME,
227	.desc	= DRIVER_DESC,
228	.date	= DRIVER_DATE,
229	.major	= DRIVER_MAJOR,
230	.minor	= DRIVER_MINOR,
231};
232
233#ifdef CONFIG_PM_SLEEP
234static int rockchip_drm_sys_suspend(struct device *dev)
235{
236	struct drm_device *drm = dev_get_drvdata(dev);
237
238	return drm_mode_config_helper_suspend(drm);
239}
240
241static int rockchip_drm_sys_resume(struct device *dev)
242{
243	struct drm_device *drm = dev_get_drvdata(dev);
244
245	return drm_mode_config_helper_resume(drm);
246}
247#endif
248
249static const struct dev_pm_ops rockchip_drm_pm_ops = {
250	SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
251				rockchip_drm_sys_resume)
252};
253
254#define MAX_ROCKCHIP_SUB_DRIVERS 16
255static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS];
256static int num_rockchip_sub_drivers;
257
258/*
259 * Check if a vop endpoint is leading to a rockchip subdriver or bridge.
260 * Should be called from the component bind stage of the drivers
261 * to ensure that all subdrivers are probed.
262 *
263 * @ep: endpoint of a rockchip vop
264 *
265 * returns true if subdriver, false if external bridge and -ENODEV
266 * if remote port does not contain a device.
267 */
268int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
269{
270	struct device_node *node = of_graph_get_remote_port_parent(ep);
271	struct platform_device *pdev;
272	struct device_driver *drv;
273	int i;
274
275	if (!node)
276		return -ENODEV;
277
278	/* status disabled will prevent creation of platform-devices */
279	pdev = of_find_device_by_node(node);
280	of_node_put(node);
281	if (!pdev)
282		return -ENODEV;
283
284	/*
285	 * All rockchip subdrivers have probed at this point, so
286	 * any device not having a driver now is an external bridge.
287	 */
288	drv = pdev->dev.driver;
289	if (!drv) {
290		platform_device_put(pdev);
291		return false;
292	}
293
294	for (i = 0; i < num_rockchip_sub_drivers; i++) {
295		if (rockchip_sub_drivers[i] == to_platform_driver(drv)) {
296			platform_device_put(pdev);
297			return true;
298		}
299	}
300
301	platform_device_put(pdev);
302	return false;
303}
304
305static int compare_dev(struct device *dev, void *data)
306{
307	return dev == (struct device *)data;
308}
309
310static void rockchip_drm_match_remove(struct device *dev)
311{
312	struct device_link *link;
313
314	list_for_each_entry(link, &dev->links.consumers, s_node)
315		device_link_del(link);
316}
317
318static struct component_match *rockchip_drm_match_add(struct device *dev)
319{
320	struct component_match *match = NULL;
321	int i;
322
323	for (i = 0; i < num_rockchip_sub_drivers; i++) {
324		struct platform_driver *drv = rockchip_sub_drivers[i];
325		struct device *p = NULL, *d;
326
327		do {
328			d = platform_find_device_by_driver(p, &drv->driver);
329			put_device(p);
330			p = d;
331
332			if (!d)
333				break;
334
335			device_link_add(dev, d, DL_FLAG_STATELESS);
336			component_match_add(dev, &match, compare_dev, d);
337		} while (true);
338	}
339
340	if (IS_ERR(match))
341		rockchip_drm_match_remove(dev);
342
343	return match ?: ERR_PTR(-ENODEV);
344}
345
346static const struct component_master_ops rockchip_drm_ops = {
347	.bind = rockchip_drm_bind,
348	.unbind = rockchip_drm_unbind,
349};
350
351static int rockchip_drm_platform_of_probe(struct device *dev)
352{
353	struct device_node *np = dev->of_node;
354	struct device_node *port;
355	bool found = false;
356	int i;
357
358	if (!np)
359		return -ENODEV;
360
361	for (i = 0;; i++) {
362		struct device_node *iommu;
363
364		port = of_parse_phandle(np, "ports", i);
365		if (!port)
366			break;
367
368		if (!of_device_is_available(port->parent)) {
369			of_node_put(port);
370			continue;
371		}
372
373		iommu = of_parse_phandle(port->parent, "iommus", 0);
374		if (!iommu || !of_device_is_available(iommu->parent)) {
375			DRM_DEV_DEBUG(dev,
376				      "no iommu attached for %pOF, using non-iommu buffers\n",
377				      port->parent);
378			/*
379			 * if there is a crtc not support iommu, force set all
380			 * crtc use non-iommu buffer.
381			 */
382			is_support_iommu = false;
383		}
384
385		found = true;
386
387		of_node_put(iommu);
388		of_node_put(port);
389	}
390
391	if (i == 0) {
392		DRM_DEV_ERROR(dev, "missing 'ports' property\n");
393		return -ENODEV;
394	}
395
396	if (!found) {
397		DRM_DEV_ERROR(dev,
398			      "No available vop found for display-subsystem.\n");
399		return -ENODEV;
400	}
401
402	return 0;
403}
404
405static int rockchip_drm_platform_probe(struct platform_device *pdev)
406{
407	struct device *dev = &pdev->dev;
408	struct component_match *match = NULL;
409	int ret;
410
411	ret = rockchip_drm_platform_of_probe(dev);
412	if (ret)
413		return ret;
414
415	match = rockchip_drm_match_add(dev);
416	if (IS_ERR(match))
417		return PTR_ERR(match);
418
419	ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
420	if (ret < 0) {
421		rockchip_drm_match_remove(dev);
422		return ret;
423	}
424
425	return 0;
426}
427
428static int rockchip_drm_platform_remove(struct platform_device *pdev)
429{
430	component_master_del(&pdev->dev, &rockchip_drm_ops);
431
432	rockchip_drm_match_remove(&pdev->dev);
433
434	return 0;
435}
436
437static void rockchip_drm_platform_shutdown(struct platform_device *pdev)
438{
439	struct drm_device *drm = platform_get_drvdata(pdev);
440
441	if (drm)
442		drm_atomic_helper_shutdown(drm);
443}
444
445static const struct of_device_id rockchip_drm_dt_ids[] = {
446	{ .compatible = "rockchip,display-subsystem", },
447	{ /* sentinel */ },
448};
449MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
450
451static struct platform_driver rockchip_drm_platform_driver = {
452	.probe = rockchip_drm_platform_probe,
453	.remove = rockchip_drm_platform_remove,
454	.shutdown = rockchip_drm_platform_shutdown,
455	.driver = {
456		.name = "rockchip-drm",
457		.of_match_table = rockchip_drm_dt_ids,
458		.pm = &rockchip_drm_pm_ops,
459	},
460};
461
462#define ADD_ROCKCHIP_SUB_DRIVER(drv, cond) { \
463	if (IS_ENABLED(cond) && \
464	    !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \
465		rockchip_sub_drivers[num_rockchip_sub_drivers++] = &drv; \
466}
467
468static int __init rockchip_drm_init(void)
469{
470	int ret;
471
472	num_rockchip_sub_drivers = 0;
473	ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_DRM_ROCKCHIP);
474	ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver,
475				CONFIG_ROCKCHIP_LVDS);
476	ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver,
477				CONFIG_ROCKCHIP_ANALOGIX_DP);
478	ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
479	ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver,
480				CONFIG_ROCKCHIP_DW_HDMI);
481	ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver,
482				CONFIG_ROCKCHIP_DW_MIPI_DSI);
483	ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
484	ADD_ROCKCHIP_SUB_DRIVER(rk3066_hdmi_driver,
485				CONFIG_ROCKCHIP_RK3066_HDMI);
486
487	ret = platform_register_drivers(rockchip_sub_drivers,
488					num_rockchip_sub_drivers);
489	if (ret)
490		return ret;
491
492	ret = platform_driver_register(&rockchip_drm_platform_driver);
493	if (ret)
494		goto err_unreg_drivers;
495
496	return 0;
497
498err_unreg_drivers:
499	platform_unregister_drivers(rockchip_sub_drivers,
500				    num_rockchip_sub_drivers);
501	return ret;
502}
503
504static void __exit rockchip_drm_fini(void)
505{
506	platform_driver_unregister(&rockchip_drm_platform_driver);
507
508	platform_unregister_drivers(rockchip_sub_drivers,
509				    num_rockchip_sub_drivers);
510}
511
512module_init(rockchip_drm_init);
513module_exit(rockchip_drm_fini);
514
515MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
516MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
517MODULE_LICENSE("GPL v2");