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
37 static bool is_support_iommu = true;
38 static 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 */
rockchip_drm_dma_attach_device(struct drm_device * drm_dev,struct device * dev)45 int 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
rockchip_drm_dma_detach_device(struct drm_device * drm_dev,struct device * dev)63 void 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
rockchip_drm_init_iommu(struct drm_device * drm_dev)75 static 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
rockchip_iommu_cleanup(struct drm_device * drm_dev)100 static 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
rockchip_drm_bind(struct device * dev)111 static 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;
173 err_kms_helper_poll_fini:
174 drm_kms_helper_poll_fini(drm_dev);
175 rockchip_drm_fbdev_fini(drm_dev);
176 err_unbind_all:
177 component_unbind_all(dev, drm_dev);
178 err_iommu_cleanup:
179 rockchip_iommu_cleanup(drm_dev);
180 err_free:
181 drm_dev_put(drm_dev);
182 return ret;
183 }
184
rockchip_drm_unbind(struct device * dev)185 static 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
201 static 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
212 static 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
rockchip_drm_sys_suspend(struct device * dev)234 static 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
rockchip_drm_sys_resume(struct device * dev)241 static 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
249 static 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
255 static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS];
256 static 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 */
rockchip_drm_endpoint_is_subdriver(struct device_node * ep)268 int 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
compare_dev(struct device * dev,void * data)305 static int compare_dev(struct device *dev, void *data)
306 {
307 return dev == (struct device *)data;
308 }
309
rockchip_drm_match_remove(struct device * dev)310 static 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
rockchip_drm_match_add(struct device * dev)318 static 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
346 static const struct component_master_ops rockchip_drm_ops = {
347 .bind = rockchip_drm_bind,
348 .unbind = rockchip_drm_unbind,
349 };
350
rockchip_drm_platform_of_probe(struct device * dev)351 static 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
rockchip_drm_platform_probe(struct platform_device * pdev)405 static 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
rockchip_drm_platform_remove(struct platform_device * pdev)428 static 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
rockchip_drm_platform_shutdown(struct platform_device * pdev)437 static 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
445 static const struct of_device_id rockchip_drm_dt_ids[] = {
446 { .compatible = "rockchip,display-subsystem", },
447 { /* sentinel */ },
448 };
449 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
450
451 static 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
rockchip_drm_init(void)468 static 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
498 err_unreg_drivers:
499 platform_unregister_drivers(rockchip_sub_drivers,
500 num_rockchip_sub_drivers);
501 return ret;
502 }
503
rockchip_drm_fini(void)504 static 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
512 module_init(rockchip_drm_init);
513 module_exit(rockchip_drm_fini);
514
515 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
516 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
517 MODULE_LICENSE("GPL v2");
518