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_aperture.h>
20 #include <drm/drm_drv.h>
21 #include <drm/drm_fb_helper.h>
22 #include <drm/drm_gem_cma_helper.h>
23 #include <drm/drm_of.h>
24 #include <drm/drm_probe_helper.h>
25 #include <drm/drm_vblank.h>
26
27 #include "rockchip_drm_drv.h"
28 #include "rockchip_drm_fb.h"
29 #include "rockchip_drm_fbdev.h"
30 #include "rockchip_drm_gem.h"
31
32 #define DRIVER_NAME "rockchip"
33 #define DRIVER_DESC "RockChip Soc DRM"
34 #define DRIVER_DATE "20140818"
35 #define DRIVER_MAJOR 1
36 #define DRIVER_MINOR 0
37
38 static bool is_support_iommu = true;
39 static const struct drm_driver rockchip_drm_driver;
40
41 /*
42 * Attach a (component) device to the shared drm dma mapping from master drm
43 * device. This is used by the VOPs to map GEM buffers to a common DMA
44 * mapping.
45 */
rockchip_drm_dma_attach_device(struct drm_device * drm_dev,struct device * dev)46 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
47 struct device *dev)
48 {
49 struct rockchip_drm_private *private = drm_dev->dev_private;
50 int ret;
51
52 if (!is_support_iommu)
53 return 0;
54
55 ret = iommu_attach_device(private->domain, dev);
56 if (ret) {
57 DRM_DEV_ERROR(dev, "Failed to attach iommu device\n");
58 return ret;
59 }
60
61 return 0;
62 }
63
rockchip_drm_dma_detach_device(struct drm_device * drm_dev,struct device * dev)64 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
65 struct device *dev)
66 {
67 struct rockchip_drm_private *private = drm_dev->dev_private;
68 struct iommu_domain *domain = private->domain;
69
70 if (!is_support_iommu)
71 return;
72
73 iommu_detach_device(domain, dev);
74 }
75
rockchip_drm_init_iommu(struct drm_device * drm_dev)76 static int rockchip_drm_init_iommu(struct drm_device *drm_dev)
77 {
78 struct rockchip_drm_private *private = drm_dev->dev_private;
79 struct iommu_domain_geometry *geometry;
80 u64 start, end;
81
82 if (!is_support_iommu)
83 return 0;
84
85 private->domain = iommu_domain_alloc(&platform_bus_type);
86 if (!private->domain)
87 return -ENOMEM;
88
89 geometry = &private->domain->geometry;
90 start = geometry->aperture_start;
91 end = geometry->aperture_end;
92
93 DRM_DEBUG("IOMMU context initialized (aperture: %#llx-%#llx)\n",
94 start, end);
95 drm_mm_init(&private->mm, start, end - start + 1);
96 mutex_init(&private->mm_lock);
97
98 return 0;
99 }
100
rockchip_iommu_cleanup(struct drm_device * drm_dev)101 static void rockchip_iommu_cleanup(struct drm_device *drm_dev)
102 {
103 struct rockchip_drm_private *private = drm_dev->dev_private;
104
105 if (!is_support_iommu)
106 return;
107
108 drm_mm_takedown(&private->mm);
109 iommu_domain_free(private->domain);
110 }
111
rockchip_drm_bind(struct device * dev)112 static int rockchip_drm_bind(struct device *dev)
113 {
114 struct drm_device *drm_dev;
115 struct rockchip_drm_private *private;
116 int ret;
117
118 /* Remove existing drivers that may own the framebuffer memory. */
119 ret = drm_aperture_remove_framebuffers(false, &rockchip_drm_driver);
120 if (ret) {
121 DRM_DEV_ERROR(dev,
122 "Failed to remove existing framebuffers - %d.\n",
123 ret);
124 return ret;
125 }
126
127 drm_dev = drm_dev_alloc(&rockchip_drm_driver, dev);
128 if (IS_ERR(drm_dev))
129 return PTR_ERR(drm_dev);
130
131 dev_set_drvdata(dev, drm_dev);
132
133 private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
134 if (!private) {
135 ret = -ENOMEM;
136 goto err_free;
137 }
138
139 drm_dev->dev_private = private;
140
141 ret = rockchip_drm_init_iommu(drm_dev);
142 if (ret)
143 goto err_free;
144
145 ret = drmm_mode_config_init(drm_dev);
146 if (ret)
147 goto err_iommu_cleanup;
148
149 rockchip_drm_mode_config_init(drm_dev);
150
151 /* Try to bind all sub drivers. */
152 ret = component_bind_all(dev, drm_dev);
153 if (ret)
154 goto err_iommu_cleanup;
155
156 ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
157 if (ret)
158 goto err_unbind_all;
159
160 drm_mode_config_reset(drm_dev);
161
162 ret = rockchip_drm_fbdev_init(drm_dev);
163 if (ret)
164 goto err_unbind_all;
165
166 /* init kms poll for handling hpd */
167 drm_kms_helper_poll_init(drm_dev);
168
169 ret = drm_dev_register(drm_dev, 0);
170 if (ret)
171 goto err_kms_helper_poll_fini;
172
173 return 0;
174 err_kms_helper_poll_fini:
175 drm_kms_helper_poll_fini(drm_dev);
176 rockchip_drm_fbdev_fini(drm_dev);
177 err_unbind_all:
178 component_unbind_all(dev, drm_dev);
179 err_iommu_cleanup:
180 rockchip_iommu_cleanup(drm_dev);
181 err_free:
182 drm_dev_put(drm_dev);
183 return ret;
184 }
185
rockchip_drm_unbind(struct device * dev)186 static 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 rockchip_iommu_cleanup(drm_dev);
198
199 drm_dev_put(drm_dev);
200 }
201
202 static const struct file_operations rockchip_drm_driver_fops = {
203 .owner = THIS_MODULE,
204 .open = drm_open,
205 .mmap = rockchip_gem_mmap,
206 .poll = drm_poll,
207 .read = drm_read,
208 .unlocked_ioctl = drm_ioctl,
209 .compat_ioctl = drm_compat_ioctl,
210 .release = drm_release,
211 };
212
213 static const struct drm_driver rockchip_drm_driver = {
214 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
215 .lastclose = drm_fb_helper_lastclose,
216 .dumb_create = rockchip_gem_dumb_create,
217 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
218 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
219 .gem_prime_import_sg_table = rockchip_gem_prime_import_sg_table,
220 .gem_prime_mmap = rockchip_gem_mmap_buf,
221 .fops = &rockchip_drm_driver_fops,
222 .name = DRIVER_NAME,
223 .desc = DRIVER_DESC,
224 .date = DRIVER_DATE,
225 .major = DRIVER_MAJOR,
226 .minor = DRIVER_MINOR,
227 };
228
229 #ifdef CONFIG_PM_SLEEP
rockchip_drm_sys_suspend(struct device * dev)230 static int rockchip_drm_sys_suspend(struct device *dev)
231 {
232 struct drm_device *drm = dev_get_drvdata(dev);
233
234 return drm_mode_config_helper_suspend(drm);
235 }
236
rockchip_drm_sys_resume(struct device * dev)237 static int rockchip_drm_sys_resume(struct device *dev)
238 {
239 struct drm_device *drm = dev_get_drvdata(dev);
240
241 return drm_mode_config_helper_resume(drm);
242 }
243 #endif
244
245 static const struct dev_pm_ops rockchip_drm_pm_ops = {
246 SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
247 rockchip_drm_sys_resume)
248 };
249
250 #define MAX_ROCKCHIP_SUB_DRIVERS 16
251 static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS];
252 static int num_rockchip_sub_drivers;
253
254 /*
255 * Check if a vop endpoint is leading to a rockchip subdriver or bridge.
256 * Should be called from the component bind stage of the drivers
257 * to ensure that all subdrivers are probed.
258 *
259 * @ep: endpoint of a rockchip vop
260 *
261 * returns true if subdriver, false if external bridge and -ENODEV
262 * if remote port does not contain a device.
263 */
rockchip_drm_endpoint_is_subdriver(struct device_node * ep)264 int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
265 {
266 struct device_node *node = of_graph_get_remote_port_parent(ep);
267 struct platform_device *pdev;
268 struct device_driver *drv;
269 int i;
270
271 if (!node)
272 return -ENODEV;
273
274 /* status disabled will prevent creation of platform-devices */
275 if (!of_device_is_available(node)) {
276 of_node_put(node);
277 return -ENODEV;
278 }
279
280 pdev = of_find_device_by_node(node);
281 of_node_put(node);
282
283 /* enabled non-platform-devices can immediately return here */
284 if (!pdev)
285 return false;
286
287 /*
288 * All rockchip subdrivers have probed at this point, so
289 * any device not having a driver now is an external bridge.
290 */
291 drv = pdev->dev.driver;
292 if (!drv) {
293 platform_device_put(pdev);
294 return false;
295 }
296
297 for (i = 0; i < num_rockchip_sub_drivers; i++) {
298 if (rockchip_sub_drivers[i] == to_platform_driver(drv)) {
299 platform_device_put(pdev);
300 return true;
301 }
302 }
303
304 platform_device_put(pdev);
305 return false;
306 }
307
compare_dev(struct device * dev,void * data)308 static int compare_dev(struct device *dev, void *data)
309 {
310 return dev == (struct device *)data;
311 }
312
rockchip_drm_match_remove(struct device * dev)313 static void rockchip_drm_match_remove(struct device *dev)
314 {
315 struct device_link *link;
316
317 list_for_each_entry(link, &dev->links.consumers, s_node)
318 device_link_del(link);
319 }
320
rockchip_drm_match_add(struct device * dev)321 static struct component_match *rockchip_drm_match_add(struct device *dev)
322 {
323 struct component_match *match = NULL;
324 int i;
325
326 for (i = 0; i < num_rockchip_sub_drivers; i++) {
327 struct platform_driver *drv = rockchip_sub_drivers[i];
328 struct device *p = NULL, *d;
329
330 do {
331 d = platform_find_device_by_driver(p, &drv->driver);
332 put_device(p);
333 p = d;
334
335 if (!d)
336 break;
337
338 device_link_add(dev, d, DL_FLAG_STATELESS);
339 component_match_add(dev, &match, compare_dev, d);
340 } while (true);
341 }
342
343 if (IS_ERR(match))
344 rockchip_drm_match_remove(dev);
345
346 return match ?: ERR_PTR(-ENODEV);
347 }
348
349 static const struct component_master_ops rockchip_drm_ops = {
350 .bind = rockchip_drm_bind,
351 .unbind = rockchip_drm_unbind,
352 };
353
rockchip_drm_platform_of_probe(struct device * dev)354 static int rockchip_drm_platform_of_probe(struct device *dev)
355 {
356 struct device_node *np = dev->of_node;
357 struct device_node *port;
358 bool found = false;
359 int i;
360
361 if (!np)
362 return -ENODEV;
363
364 for (i = 0;; i++) {
365 struct device_node *iommu;
366
367 port = of_parse_phandle(np, "ports", i);
368 if (!port)
369 break;
370
371 if (!of_device_is_available(port->parent)) {
372 of_node_put(port);
373 continue;
374 }
375
376 iommu = of_parse_phandle(port->parent, "iommus", 0);
377 if (!iommu || !of_device_is_available(iommu)) {
378 DRM_DEV_DEBUG(dev,
379 "no iommu attached for %pOF, using non-iommu buffers\n",
380 port->parent);
381 /*
382 * if there is a crtc not support iommu, force set all
383 * crtc use non-iommu buffer.
384 */
385 is_support_iommu = false;
386 }
387
388 found = true;
389
390 of_node_put(iommu);
391 of_node_put(port);
392 }
393
394 if (i == 0) {
395 DRM_DEV_ERROR(dev, "missing 'ports' property\n");
396 return -ENODEV;
397 }
398
399 if (!found) {
400 DRM_DEV_ERROR(dev,
401 "No available vop found for display-subsystem.\n");
402 return -ENODEV;
403 }
404
405 return 0;
406 }
407
rockchip_drm_platform_probe(struct platform_device * pdev)408 static int rockchip_drm_platform_probe(struct platform_device *pdev)
409 {
410 struct device *dev = &pdev->dev;
411 struct component_match *match = NULL;
412 int ret;
413
414 ret = rockchip_drm_platform_of_probe(dev);
415 if (ret)
416 return ret;
417
418 match = rockchip_drm_match_add(dev);
419 if (IS_ERR(match))
420 return PTR_ERR(match);
421
422 ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
423 if (ret < 0) {
424 rockchip_drm_match_remove(dev);
425 return ret;
426 }
427
428 return 0;
429 }
430
rockchip_drm_platform_remove(struct platform_device * pdev)431 static int rockchip_drm_platform_remove(struct platform_device *pdev)
432 {
433 component_master_del(&pdev->dev, &rockchip_drm_ops);
434
435 rockchip_drm_match_remove(&pdev->dev);
436
437 return 0;
438 }
439
rockchip_drm_platform_shutdown(struct platform_device * pdev)440 static void rockchip_drm_platform_shutdown(struct platform_device *pdev)
441 {
442 struct drm_device *drm = platform_get_drvdata(pdev);
443
444 if (drm)
445 drm_atomic_helper_shutdown(drm);
446 }
447
448 static const struct of_device_id rockchip_drm_dt_ids[] = {
449 { .compatible = "rockchip,display-subsystem", },
450 { /* sentinel */ },
451 };
452 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
453
454 static struct platform_driver rockchip_drm_platform_driver = {
455 .probe = rockchip_drm_platform_probe,
456 .remove = rockchip_drm_platform_remove,
457 .shutdown = rockchip_drm_platform_shutdown,
458 .driver = {
459 .name = "rockchip-drm",
460 .of_match_table = rockchip_drm_dt_ids,
461 .pm = &rockchip_drm_pm_ops,
462 },
463 };
464
465 #define ADD_ROCKCHIP_SUB_DRIVER(drv, cond) { \
466 if (IS_ENABLED(cond) && \
467 !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \
468 rockchip_sub_drivers[num_rockchip_sub_drivers++] = &drv; \
469 }
470
rockchip_drm_init(void)471 static int __init rockchip_drm_init(void)
472 {
473 int ret;
474
475 num_rockchip_sub_drivers = 0;
476 ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_DRM_ROCKCHIP);
477 ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver,
478 CONFIG_ROCKCHIP_LVDS);
479 ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver,
480 CONFIG_ROCKCHIP_ANALOGIX_DP);
481 ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
482 ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver,
483 CONFIG_ROCKCHIP_DW_HDMI);
484 ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver,
485 CONFIG_ROCKCHIP_DW_MIPI_DSI);
486 ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
487 ADD_ROCKCHIP_SUB_DRIVER(rk3066_hdmi_driver,
488 CONFIG_ROCKCHIP_RK3066_HDMI);
489
490 ret = platform_register_drivers(rockchip_sub_drivers,
491 num_rockchip_sub_drivers);
492 if (ret)
493 return ret;
494
495 ret = platform_driver_register(&rockchip_drm_platform_driver);
496 if (ret)
497 goto err_unreg_drivers;
498
499 return 0;
500
501 err_unreg_drivers:
502 platform_unregister_drivers(rockchip_sub_drivers,
503 num_rockchip_sub_drivers);
504 return ret;
505 }
506
rockchip_drm_fini(void)507 static void __exit rockchip_drm_fini(void)
508 {
509 platform_driver_unregister(&rockchip_drm_platform_driver);
510
511 platform_unregister_drivers(rockchip_sub_drivers,
512 num_rockchip_sub_drivers);
513 }
514
515 module_init(rockchip_drm_init);
516 module_exit(rockchip_drm_fini);
517
518 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
519 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
520 MODULE_LICENSE("GPL v2");
521