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/platform_device.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_aperture.h>
20 #include <drm/drm_drv.h>
21 #include <drm/drm_fbdev_generic.h>
22 #include <drm/drm_gem_dma_helper.h>
23 #include <drm/drm_of.h>
24 #include <drm/drm_probe_helper.h>
25 #include <drm/drm_vblank.h>
26
27 #if defined(CONFIG_ARM_DMA_USE_IOMMU)
28 #include <asm/dma-iommu.h>
29 #else
30 #define arm_iommu_detach_device(...) ({ })
31 #define arm_iommu_release_mapping(...) ({ })
32 #define to_dma_iommu_mapping(dev) NULL
33 #endif
34
35 #include "rockchip_drm_drv.h"
36 #include "rockchip_drm_fb.h"
37 #include "rockchip_drm_gem.h"
38
39 #define DRIVER_NAME "rockchip"
40 #define DRIVER_DESC "RockChip Soc DRM"
41 #define DRIVER_DATE "20140818"
42 #define DRIVER_MAJOR 1
43 #define DRIVER_MINOR 0
44
45 static const struct drm_driver rockchip_drm_driver;
46
47 /*
48 * Attach a (component) device to the shared drm dma mapping from master drm
49 * device. This is used by the VOPs to map GEM buffers to a common DMA
50 * mapping.
51 */
rockchip_drm_dma_attach_device(struct drm_device * drm_dev,struct device * dev)52 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
53 struct device *dev)
54 {
55 struct rockchip_drm_private *private = drm_dev->dev_private;
56 int ret;
57
58 if (!private->domain)
59 return 0;
60
61 if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) {
62 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
63
64 if (mapping) {
65 arm_iommu_detach_device(dev);
66 arm_iommu_release_mapping(mapping);
67 }
68 }
69
70 ret = iommu_attach_device(private->domain, dev);
71 if (ret) {
72 DRM_DEV_ERROR(dev, "Failed to attach iommu device\n");
73 return ret;
74 }
75
76 return 0;
77 }
78
rockchip_drm_dma_detach_device(struct drm_device * drm_dev,struct device * dev)79 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
80 struct device *dev)
81 {
82 struct rockchip_drm_private *private = drm_dev->dev_private;
83
84 if (!private->domain)
85 return;
86
87 iommu_detach_device(private->domain, dev);
88 }
89
rockchip_drm_dma_init_device(struct drm_device * drm_dev,struct device * dev)90 void rockchip_drm_dma_init_device(struct drm_device *drm_dev,
91 struct device *dev)
92 {
93 struct rockchip_drm_private *private = drm_dev->dev_private;
94
95 if (!device_iommu_mapped(dev))
96 private->iommu_dev = ERR_PTR(-ENODEV);
97 else if (!private->iommu_dev)
98 private->iommu_dev = dev;
99 }
100
rockchip_drm_init_iommu(struct drm_device * drm_dev)101 static int rockchip_drm_init_iommu(struct drm_device *drm_dev)
102 {
103 struct rockchip_drm_private *private = drm_dev->dev_private;
104 struct iommu_domain_geometry *geometry;
105 u64 start, end;
106
107 if (IS_ERR_OR_NULL(private->iommu_dev))
108 return 0;
109
110 private->domain = iommu_domain_alloc(private->iommu_dev->bus);
111 if (!private->domain)
112 return -ENOMEM;
113
114 geometry = &private->domain->geometry;
115 start = geometry->aperture_start;
116 end = geometry->aperture_end;
117
118 DRM_DEBUG("IOMMU context initialized (aperture: %#llx-%#llx)\n",
119 start, end);
120 drm_mm_init(&private->mm, start, end - start + 1);
121 mutex_init(&private->mm_lock);
122
123 return 0;
124 }
125
rockchip_iommu_cleanup(struct drm_device * drm_dev)126 static void rockchip_iommu_cleanup(struct drm_device *drm_dev)
127 {
128 struct rockchip_drm_private *private = drm_dev->dev_private;
129
130 if (!private->domain)
131 return;
132
133 drm_mm_takedown(&private->mm);
134 iommu_domain_free(private->domain);
135 }
136
rockchip_drm_bind(struct device * dev)137 static int rockchip_drm_bind(struct device *dev)
138 {
139 struct drm_device *drm_dev;
140 struct rockchip_drm_private *private;
141 int ret;
142
143 /* Remove existing drivers that may own the framebuffer memory. */
144 ret = drm_aperture_remove_framebuffers(&rockchip_drm_driver);
145 if (ret) {
146 DRM_DEV_ERROR(dev,
147 "Failed to remove existing framebuffers - %d.\n",
148 ret);
149 return ret;
150 }
151
152 drm_dev = drm_dev_alloc(&rockchip_drm_driver, dev);
153 if (IS_ERR(drm_dev))
154 return PTR_ERR(drm_dev);
155
156 dev_set_drvdata(dev, drm_dev);
157
158 private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
159 if (!private) {
160 ret = -ENOMEM;
161 goto err_free;
162 }
163
164 drm_dev->dev_private = private;
165
166 ret = drmm_mode_config_init(drm_dev);
167 if (ret)
168 goto err_free;
169
170 rockchip_drm_mode_config_init(drm_dev);
171
172 /* Try to bind all sub drivers. */
173 ret = component_bind_all(dev, drm_dev);
174 if (ret)
175 goto err_free;
176
177 ret = rockchip_drm_init_iommu(drm_dev);
178 if (ret)
179 goto err_unbind_all;
180
181 ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
182 if (ret)
183 goto err_iommu_cleanup;
184
185 drm_mode_config_reset(drm_dev);
186
187 /* init kms poll for handling hpd */
188 drm_kms_helper_poll_init(drm_dev);
189
190 ret = drm_dev_register(drm_dev, 0);
191 if (ret)
192 goto err_kms_helper_poll_fini;
193
194 drm_fbdev_generic_setup(drm_dev, 0);
195
196 return 0;
197 err_kms_helper_poll_fini:
198 drm_kms_helper_poll_fini(drm_dev);
199 err_iommu_cleanup:
200 rockchip_iommu_cleanup(drm_dev);
201 err_unbind_all:
202 component_unbind_all(dev, drm_dev);
203 err_free:
204 drm_dev_put(drm_dev);
205 return ret;
206 }
207
rockchip_drm_unbind(struct device * dev)208 static void rockchip_drm_unbind(struct device *dev)
209 {
210 struct drm_device *drm_dev = dev_get_drvdata(dev);
211
212 drm_dev_unregister(drm_dev);
213
214 drm_kms_helper_poll_fini(drm_dev);
215
216 drm_atomic_helper_shutdown(drm_dev);
217 component_unbind_all(dev, drm_dev);
218 rockchip_iommu_cleanup(drm_dev);
219
220 drm_dev_put(drm_dev);
221 }
222
223 DEFINE_DRM_GEM_FOPS(rockchip_drm_driver_fops);
224
225 static const struct drm_driver rockchip_drm_driver = {
226 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
227 .dumb_create = rockchip_gem_dumb_create,
228 .gem_prime_import_sg_table = rockchip_gem_prime_import_sg_table,
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
rockchip_drm_sys_suspend(struct device * dev)238 static 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
rockchip_drm_sys_resume(struct device * dev)245 static 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
253 static 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
259 static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS];
260 static int num_rockchip_sub_drivers;
261
262 /*
263 * Get the endpoint id of the remote endpoint of the given encoder. This
264 * information is used by the VOP2 driver to identify the encoder.
265 *
266 * @rkencoder: The encoder to get the remote endpoint id from
267 * @np: The encoder device node
268 * @port: The number of the port leading to the VOP2
269 * @reg: The endpoint number leading to the VOP2
270 */
rockchip_drm_encoder_set_crtc_endpoint_id(struct rockchip_encoder * rkencoder,struct device_node * np,int port,int reg)271 int rockchip_drm_encoder_set_crtc_endpoint_id(struct rockchip_encoder *rkencoder,
272 struct device_node *np, int port, int reg)
273 {
274 struct of_endpoint ep;
275 struct device_node *en, *ren;
276 int ret;
277
278 en = of_graph_get_endpoint_by_regs(np, port, reg);
279 if (!en)
280 return -ENOENT;
281
282 ren = of_graph_get_remote_endpoint(en);
283 if (!ren)
284 return -ENOENT;
285
286 ret = of_graph_parse_endpoint(ren, &ep);
287 if (ret)
288 return ret;
289
290 rkencoder->crtc_endpoint_id = ep.id;
291
292 return 0;
293 }
294
295 /*
296 * Check if a vop endpoint is leading to a rockchip subdriver or bridge.
297 * Should be called from the component bind stage of the drivers
298 * to ensure that all subdrivers are probed.
299 *
300 * @ep: endpoint of a rockchip vop
301 *
302 * returns true if subdriver, false if external bridge and -ENODEV
303 * if remote port does not contain a device.
304 */
rockchip_drm_endpoint_is_subdriver(struct device_node * ep)305 int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
306 {
307 struct device_node *node = of_graph_get_remote_port_parent(ep);
308 struct platform_device *pdev;
309 struct device_driver *drv;
310 int i;
311
312 if (!node)
313 return -ENODEV;
314
315 /* status disabled will prevent creation of platform-devices */
316 if (!of_device_is_available(node)) {
317 of_node_put(node);
318 return -ENODEV;
319 }
320
321 pdev = of_find_device_by_node(node);
322 of_node_put(node);
323
324 /* enabled non-platform-devices can immediately return here */
325 if (!pdev)
326 return false;
327
328 /*
329 * All rockchip subdrivers have probed at this point, so
330 * any device not having a driver now is an external bridge.
331 */
332 drv = pdev->dev.driver;
333 if (!drv) {
334 platform_device_put(pdev);
335 return false;
336 }
337
338 for (i = 0; i < num_rockchip_sub_drivers; i++) {
339 if (rockchip_sub_drivers[i] == to_platform_driver(drv)) {
340 platform_device_put(pdev);
341 return true;
342 }
343 }
344
345 platform_device_put(pdev);
346 return false;
347 }
348
rockchip_drm_match_remove(struct device * dev)349 static void rockchip_drm_match_remove(struct device *dev)
350 {
351 struct device_link *link;
352
353 list_for_each_entry(link, &dev->links.consumers, s_node)
354 device_link_del(link);
355 }
356
rockchip_drm_match_add(struct device * dev)357 static struct component_match *rockchip_drm_match_add(struct device *dev)
358 {
359 struct component_match *match = NULL;
360 int i;
361
362 for (i = 0; i < num_rockchip_sub_drivers; i++) {
363 struct platform_driver *drv = rockchip_sub_drivers[i];
364 struct device *p = NULL, *d;
365
366 do {
367 d = platform_find_device_by_driver(p, &drv->driver);
368 put_device(p);
369 p = d;
370
371 if (!d)
372 break;
373
374 device_link_add(dev, d, DL_FLAG_STATELESS);
375 component_match_add(dev, &match, component_compare_dev, d);
376 } while (true);
377 }
378
379 if (IS_ERR(match))
380 rockchip_drm_match_remove(dev);
381
382 return match ?: ERR_PTR(-ENODEV);
383 }
384
385 static const struct component_master_ops rockchip_drm_ops = {
386 .bind = rockchip_drm_bind,
387 .unbind = rockchip_drm_unbind,
388 };
389
rockchip_drm_platform_of_probe(struct device * dev)390 static int rockchip_drm_platform_of_probe(struct device *dev)
391 {
392 struct device_node *np = dev->of_node;
393 struct device_node *port;
394 bool found = false;
395 int i;
396
397 if (!np)
398 return -ENODEV;
399
400 for (i = 0;; i++) {
401 port = of_parse_phandle(np, "ports", i);
402 if (!port)
403 break;
404
405 if (!of_device_is_available(port->parent)) {
406 of_node_put(port);
407 continue;
408 }
409
410 found = true;
411 of_node_put(port);
412 }
413
414 if (i == 0) {
415 DRM_DEV_ERROR(dev, "missing 'ports' property\n");
416 return -ENODEV;
417 }
418
419 if (!found) {
420 DRM_DEV_ERROR(dev,
421 "No available vop found for display-subsystem.\n");
422 return -ENODEV;
423 }
424
425 return 0;
426 }
427
rockchip_drm_platform_probe(struct platform_device * pdev)428 static int rockchip_drm_platform_probe(struct platform_device *pdev)
429 {
430 struct device *dev = &pdev->dev;
431 struct component_match *match = NULL;
432 int ret;
433
434 ret = rockchip_drm_platform_of_probe(dev);
435 if (ret)
436 return ret;
437
438 match = rockchip_drm_match_add(dev);
439 if (IS_ERR(match))
440 return PTR_ERR(match);
441
442 ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
443 if (ret < 0) {
444 rockchip_drm_match_remove(dev);
445 return ret;
446 }
447
448 return 0;
449 }
450
rockchip_drm_platform_remove(struct platform_device * pdev)451 static void rockchip_drm_platform_remove(struct platform_device *pdev)
452 {
453 component_master_del(&pdev->dev, &rockchip_drm_ops);
454
455 rockchip_drm_match_remove(&pdev->dev);
456 }
457
rockchip_drm_platform_shutdown(struct platform_device * pdev)458 static void rockchip_drm_platform_shutdown(struct platform_device *pdev)
459 {
460 struct drm_device *drm = platform_get_drvdata(pdev);
461
462 if (drm)
463 drm_atomic_helper_shutdown(drm);
464 }
465
466 static const struct of_device_id rockchip_drm_dt_ids[] = {
467 { .compatible = "rockchip,display-subsystem", },
468 { /* sentinel */ },
469 };
470 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
471
472 static struct platform_driver rockchip_drm_platform_driver = {
473 .probe = rockchip_drm_platform_probe,
474 .remove_new = rockchip_drm_platform_remove,
475 .shutdown = rockchip_drm_platform_shutdown,
476 .driver = {
477 .name = "rockchip-drm",
478 .of_match_table = rockchip_drm_dt_ids,
479 .pm = &rockchip_drm_pm_ops,
480 },
481 };
482
483 #define ADD_ROCKCHIP_SUB_DRIVER(drv, cond) { \
484 if (IS_ENABLED(cond) && \
485 !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \
486 rockchip_sub_drivers[num_rockchip_sub_drivers++] = &drv; \
487 }
488
rockchip_drm_init(void)489 static int __init rockchip_drm_init(void)
490 {
491 int ret;
492
493 if (drm_firmware_drivers_only())
494 return -ENODEV;
495
496 num_rockchip_sub_drivers = 0;
497 ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_ROCKCHIP_VOP);
498 ADD_ROCKCHIP_SUB_DRIVER(vop2_platform_driver, CONFIG_ROCKCHIP_VOP2);
499 ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver,
500 CONFIG_ROCKCHIP_LVDS);
501 ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver,
502 CONFIG_ROCKCHIP_ANALOGIX_DP);
503 ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
504 ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver,
505 CONFIG_ROCKCHIP_DW_HDMI);
506 ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver,
507 CONFIG_ROCKCHIP_DW_MIPI_DSI);
508 ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
509 ADD_ROCKCHIP_SUB_DRIVER(rk3066_hdmi_driver,
510 CONFIG_ROCKCHIP_RK3066_HDMI);
511
512 ret = platform_register_drivers(rockchip_sub_drivers,
513 num_rockchip_sub_drivers);
514 if (ret)
515 return ret;
516
517 ret = platform_driver_register(&rockchip_drm_platform_driver);
518 if (ret)
519 goto err_unreg_drivers;
520
521 return 0;
522
523 err_unreg_drivers:
524 platform_unregister_drivers(rockchip_sub_drivers,
525 num_rockchip_sub_drivers);
526 return ret;
527 }
528
rockchip_drm_fini(void)529 static void __exit rockchip_drm_fini(void)
530 {
531 platform_driver_unregister(&rockchip_drm_platform_driver);
532
533 platform_unregister_drivers(rockchip_sub_drivers,
534 num_rockchip_sub_drivers);
535 }
536
537 module_init(rockchip_drm_init);
538 module_exit(rockchip_drm_fini);
539
540 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
541 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
542 MODULE_LICENSE("GPL v2");
543