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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 drm_mode_config_init(drm_dev);
139
140 rockchip_drm_mode_config_init(drm_dev);
141
142 /* Try to bind all sub drivers. */
143 ret = component_bind_all(dev, drm_dev);
144 if (ret)
145 goto err_mode_config_cleanup;
146
147 ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
148 if (ret)
149 goto err_unbind_all;
150
151 drm_mode_config_reset(drm_dev);
152
153 /*
154 * enable drm irq mode.
155 * - with irq_enabled = true, we can use the vblank feature.
156 */
157 drm_dev->irq_enabled = true;
158
159 ret = rockchip_drm_fbdev_init(drm_dev);
160 if (ret)
161 goto err_unbind_all;
162
163 /* init kms poll for handling hpd */
164 drm_kms_helper_poll_init(drm_dev);
165
166 ret = drm_dev_register(drm_dev, 0);
167 if (ret)
168 goto err_kms_helper_poll_fini;
169
170 return 0;
171err_kms_helper_poll_fini:
172 drm_kms_helper_poll_fini(drm_dev);
173 rockchip_drm_fbdev_fini(drm_dev);
174err_unbind_all:
175 component_unbind_all(dev, drm_dev);
176err_mode_config_cleanup:
177 drm_mode_config_cleanup(drm_dev);
178 rockchip_iommu_cleanup(drm_dev);
179err_free:
180 drm_dev->dev_private = NULL;
181 dev_set_drvdata(dev, NULL);
182 drm_dev_put(drm_dev);
183 return ret;
184}
185
186static void rockchip_drm_unbind(struct device *dev)
187{
188 struct drm_device *drm_dev = dev_get_drvdata(dev);
189
190 drm_dev_unregister(drm_dev);
191
192 rockchip_drm_fbdev_fini(drm_dev);
193 drm_kms_helper_poll_fini(drm_dev);
194
195 drm_atomic_helper_shutdown(drm_dev);
196 component_unbind_all(dev, drm_dev);
197 drm_mode_config_cleanup(drm_dev);
198 rockchip_iommu_cleanup(drm_dev);
199
200 drm_dev->dev_private = NULL;
201 dev_set_drvdata(dev, NULL);
202 drm_dev_put(drm_dev);
203}
204
205static const struct file_operations rockchip_drm_driver_fops = {
206 .owner = THIS_MODULE,
207 .open = drm_open,
208 .mmap = rockchip_gem_mmap,
209 .poll = drm_poll,
210 .read = drm_read,
211 .unlocked_ioctl = drm_ioctl,
212 .compat_ioctl = drm_compat_ioctl,
213 .release = drm_release,
214};
215
216static struct drm_driver rockchip_drm_driver = {
217 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
218 .lastclose = drm_fb_helper_lastclose,
219 .gem_vm_ops = &drm_gem_cma_vm_ops,
220 .gem_free_object_unlocked = rockchip_gem_free_object,
221 .dumb_create = rockchip_gem_dumb_create,
222 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
223 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
224 .gem_prime_get_sg_table = rockchip_gem_prime_get_sg_table,
225 .gem_prime_import_sg_table = rockchip_gem_prime_import_sg_table,
226 .gem_prime_vmap = rockchip_gem_prime_vmap,
227 .gem_prime_vunmap = rockchip_gem_prime_vunmap,
228 .gem_prime_mmap = rockchip_gem_mmap_buf,
229 .fops = &rockchip_drm_driver_fops,
230 .name = DRIVER_NAME,
231 .desc = DRIVER_DESC,
232 .date = DRIVER_DATE,
233 .major = DRIVER_MAJOR,
234 .minor = DRIVER_MINOR,
235};
236
237#ifdef CONFIG_PM_SLEEP
238static int rockchip_drm_sys_suspend(struct device *dev)
239{
240 struct drm_device *drm = dev_get_drvdata(dev);
241
242 return drm_mode_config_helper_suspend(drm);
243}
244
245static int rockchip_drm_sys_resume(struct device *dev)
246{
247 struct drm_device *drm = dev_get_drvdata(dev);
248
249 return drm_mode_config_helper_resume(drm);
250}
251#endif
252
253static const struct dev_pm_ops rockchip_drm_pm_ops = {
254 SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
255 rockchip_drm_sys_resume)
256};
257
258#define MAX_ROCKCHIP_SUB_DRIVERS 16
259static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS];
260static int num_rockchip_sub_drivers;
261
262/*
263 * Check if a vop endpoint is leading to a rockchip subdriver or bridge.
264 * Should be called from the component bind stage of the drivers
265 * to ensure that all subdrivers are probed.
266 *
267 * @ep: endpoint of a rockchip vop
268 *
269 * returns true if subdriver, false if external bridge and -ENODEV
270 * if remote port does not contain a device.
271 */
272int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
273{
274 struct device_node *node = of_graph_get_remote_port_parent(ep);
275 struct platform_device *pdev;
276 struct device_driver *drv;
277 int i;
278
279 if (!node)
280 return -ENODEV;
281
282 /* status disabled will prevent creation of platform-devices */
283 pdev = of_find_device_by_node(node);
284 of_node_put(node);
285 if (!pdev)
286 return -ENODEV;
287
288 /*
289 * All rockchip subdrivers have probed at this point, so
290 * any device not having a driver now is an external bridge.
291 */
292 drv = pdev->dev.driver;
293 if (!drv) {
294 platform_device_put(pdev);
295 return false;
296 }
297
298 for (i = 0; i < num_rockchip_sub_drivers; i++) {
299 if (rockchip_sub_drivers[i] == to_platform_driver(drv)) {
300 platform_device_put(pdev);
301 return true;
302 }
303 }
304
305 platform_device_put(pdev);
306 return false;
307}
308
309static int compare_dev(struct device *dev, void *data)
310{
311 return dev == (struct device *)data;
312}
313
314static void rockchip_drm_match_remove(struct device *dev)
315{
316 struct device_link *link;
317
318 list_for_each_entry(link, &dev->links.consumers, s_node)
319 device_link_del(link);
320}
321
322static struct component_match *rockchip_drm_match_add(struct device *dev)
323{
324 struct component_match *match = NULL;
325 int i;
326
327 for (i = 0; i < num_rockchip_sub_drivers; i++) {
328 struct platform_driver *drv = rockchip_sub_drivers[i];
329 struct device *p = NULL, *d;
330
331 do {
332 d = platform_find_device_by_driver(p, &drv->driver);
333 put_device(p);
334 p = d;
335
336 if (!d)
337 break;
338
339 device_link_add(dev, d, DL_FLAG_STATELESS);
340 component_match_add(dev, &match, compare_dev, d);
341 } while (true);
342 }
343
344 if (IS_ERR(match))
345 rockchip_drm_match_remove(dev);
346
347 return match ?: ERR_PTR(-ENODEV);
348}
349
350static const struct component_master_ops rockchip_drm_ops = {
351 .bind = rockchip_drm_bind,
352 .unbind = rockchip_drm_unbind,
353};
354
355static int rockchip_drm_platform_of_probe(struct device *dev)
356{
357 struct device_node *np = dev->of_node;
358 struct device_node *port;
359 bool found = false;
360 int i;
361
362 if (!np)
363 return -ENODEV;
364
365 for (i = 0;; i++) {
366 struct device_node *iommu;
367
368 port = of_parse_phandle(np, "ports", i);
369 if (!port)
370 break;
371
372 if (!of_device_is_available(port->parent)) {
373 of_node_put(port);
374 continue;
375 }
376
377 iommu = of_parse_phandle(port->parent, "iommus", 0);
378 if (!iommu || !of_device_is_available(iommu->parent)) {
379 DRM_DEV_DEBUG(dev,
380 "no iommu attached for %pOF, using non-iommu buffers\n",
381 port->parent);
382 /*
383 * if there is a crtc not support iommu, force set all
384 * crtc use non-iommu buffer.
385 */
386 is_support_iommu = false;
387 }
388
389 found = true;
390
391 of_node_put(iommu);
392 of_node_put(port);
393 }
394
395 if (i == 0) {
396 DRM_DEV_ERROR(dev, "missing 'ports' property\n");
397 return -ENODEV;
398 }
399
400 if (!found) {
401 DRM_DEV_ERROR(dev,
402 "No available vop found for display-subsystem.\n");
403 return -ENODEV;
404 }
405
406 return 0;
407}
408
409static int rockchip_drm_platform_probe(struct platform_device *pdev)
410{
411 struct device *dev = &pdev->dev;
412 struct component_match *match = NULL;
413 int ret;
414
415 ret = rockchip_drm_platform_of_probe(dev);
416 if (ret)
417 return ret;
418
419 match = rockchip_drm_match_add(dev);
420 if (IS_ERR(match))
421 return PTR_ERR(match);
422
423 ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
424 if (ret < 0) {
425 rockchip_drm_match_remove(dev);
426 return ret;
427 }
428
429 return 0;
430}
431
432static int rockchip_drm_platform_remove(struct platform_device *pdev)
433{
434 component_master_del(&pdev->dev, &rockchip_drm_ops);
435
436 rockchip_drm_match_remove(&pdev->dev);
437
438 return 0;
439}
440
441static void rockchip_drm_platform_shutdown(struct platform_device *pdev)
442{
443 struct drm_device *drm = platform_get_drvdata(pdev);
444
445 if (drm)
446 drm_atomic_helper_shutdown(drm);
447}
448
449static const struct of_device_id rockchip_drm_dt_ids[] = {
450 { .compatible = "rockchip,display-subsystem", },
451 { /* sentinel */ },
452};
453MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
454
455static struct platform_driver rockchip_drm_platform_driver = {
456 .probe = rockchip_drm_platform_probe,
457 .remove = rockchip_drm_platform_remove,
458 .shutdown = rockchip_drm_platform_shutdown,
459 .driver = {
460 .name = "rockchip-drm",
461 .of_match_table = rockchip_drm_dt_ids,
462 .pm = &rockchip_drm_pm_ops,
463 },
464};
465
466#define ADD_ROCKCHIP_SUB_DRIVER(drv, cond) { \
467 if (IS_ENABLED(cond) && \
468 !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \
469 rockchip_sub_drivers[num_rockchip_sub_drivers++] = &drv; \
470}
471
472static int __init rockchip_drm_init(void)
473{
474 int ret;
475
476 num_rockchip_sub_drivers = 0;
477 ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_DRM_ROCKCHIP);
478 ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver,
479 CONFIG_ROCKCHIP_LVDS);
480 ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver,
481 CONFIG_ROCKCHIP_ANALOGIX_DP);
482 ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
483 ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver,
484 CONFIG_ROCKCHIP_DW_HDMI);
485 ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver,
486 CONFIG_ROCKCHIP_DW_MIPI_DSI);
487 ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
488 ADD_ROCKCHIP_SUB_DRIVER(rk3066_hdmi_driver,
489 CONFIG_ROCKCHIP_RK3066_HDMI);
490
491 ret = platform_register_drivers(rockchip_sub_drivers,
492 num_rockchip_sub_drivers);
493 if (ret)
494 return ret;
495
496 ret = platform_driver_register(&rockchip_drm_platform_driver);
497 if (ret)
498 goto err_unreg_drivers;
499
500 return 0;
501
502err_unreg_drivers:
503 platform_unregister_drivers(rockchip_sub_drivers,
504 num_rockchip_sub_drivers);
505 return ret;
506}
507
508static void __exit rockchip_drm_fini(void)
509{
510 platform_driver_unregister(&rockchip_drm_platform_driver);
511
512 platform_unregister_drivers(rockchip_sub_drivers,
513 num_rockchip_sub_drivers);
514}
515
516module_init(rockchip_drm_init);
517module_exit(rockchip_drm_fini);
518
519MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
520MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
521MODULE_LICENSE("GPL v2");