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1/*
2 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
3 * Author:Mark Yao <mark.yao@rock-chips.com>
4 *
5 * based on exynos_drm_drv.c
6 *
7 * This software is licensed under the terms of the GNU General Public
8 * License version 2, as published by the Free Software Foundation, and
9 * may be copied, distributed, and modified under those terms.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17#include <asm/dma-iommu.h>
18
19#include <drm/drmP.h>
20#include <drm/drm_crtc_helper.h>
21#include <drm/drm_fb_helper.h>
22#include <linux/dma-mapping.h>
23#include <linux/pm_runtime.h>
24#include <linux/module.h>
25#include <linux/of_graph.h>
26#include <linux/component.h>
27
28#include "rockchip_drm_drv.h"
29#include "rockchip_drm_fb.h"
30#include "rockchip_drm_fbdev.h"
31#include "rockchip_drm_gem.h"
32
33#define DRIVER_NAME "rockchip"
34#define DRIVER_DESC "RockChip Soc DRM"
35#define DRIVER_DATE "20140818"
36#define DRIVER_MAJOR 1
37#define DRIVER_MINOR 0
38
39/*
40 * Attach a (component) device to the shared drm dma mapping from master drm
41 * device. This is used by the VOPs to map GEM buffers to a common DMA
42 * mapping.
43 */
44int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
45 struct device *dev)
46{
47 struct dma_iommu_mapping *mapping = drm_dev->dev->archdata.mapping;
48 int ret;
49
50 ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
51 if (ret)
52 return ret;
53
54 dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
55
56 return arm_iommu_attach_device(dev, mapping);
57}
58
59void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
60 struct device *dev)
61{
62 arm_iommu_detach_device(dev);
63}
64
65int rockchip_register_crtc_funcs(struct drm_crtc *crtc,
66 const struct rockchip_crtc_funcs *crtc_funcs)
67{
68 int pipe = drm_crtc_index(crtc);
69 struct rockchip_drm_private *priv = crtc->dev->dev_private;
70
71 if (pipe > ROCKCHIP_MAX_CRTC)
72 return -EINVAL;
73
74 priv->crtc_funcs[pipe] = crtc_funcs;
75
76 return 0;
77}
78
79void rockchip_unregister_crtc_funcs(struct drm_crtc *crtc)
80{
81 int pipe = drm_crtc_index(crtc);
82 struct rockchip_drm_private *priv = crtc->dev->dev_private;
83
84 if (pipe > ROCKCHIP_MAX_CRTC)
85 return;
86
87 priv->crtc_funcs[pipe] = NULL;
88}
89
90static struct drm_crtc *rockchip_crtc_from_pipe(struct drm_device *drm,
91 int pipe)
92{
93 struct drm_crtc *crtc;
94 int i = 0;
95
96 list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
97 if (i++ == pipe)
98 return crtc;
99
100 return NULL;
101}
102
103static int rockchip_drm_crtc_enable_vblank(struct drm_device *dev,
104 unsigned int pipe)
105{
106 struct rockchip_drm_private *priv = dev->dev_private;
107 struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
108
109 if (crtc && priv->crtc_funcs[pipe] &&
110 priv->crtc_funcs[pipe]->enable_vblank)
111 return priv->crtc_funcs[pipe]->enable_vblank(crtc);
112
113 return 0;
114}
115
116static void rockchip_drm_crtc_disable_vblank(struct drm_device *dev,
117 unsigned int pipe)
118{
119 struct rockchip_drm_private *priv = dev->dev_private;
120 struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
121
122 if (crtc && priv->crtc_funcs[pipe] &&
123 priv->crtc_funcs[pipe]->enable_vblank)
124 priv->crtc_funcs[pipe]->disable_vblank(crtc);
125}
126
127static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags)
128{
129 struct rockchip_drm_private *private;
130 struct dma_iommu_mapping *mapping;
131 struct device *dev = drm_dev->dev;
132 struct drm_connector *connector;
133 int ret;
134
135 private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
136 if (!private)
137 return -ENOMEM;
138
139 mutex_init(&private->commit.lock);
140 INIT_WORK(&private->commit.work, rockchip_drm_atomic_work);
141
142 drm_dev->dev_private = private;
143
144 drm_mode_config_init(drm_dev);
145
146 rockchip_drm_mode_config_init(drm_dev);
147
148 dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
149 GFP_KERNEL);
150 if (!dev->dma_parms) {
151 ret = -ENOMEM;
152 goto err_config_cleanup;
153 }
154
155 /* TODO(djkurtz): fetch the mapping start/size from somewhere */
156 mapping = arm_iommu_create_mapping(&platform_bus_type, 0x00000000,
157 SZ_2G);
158 if (IS_ERR(mapping)) {
159 ret = PTR_ERR(mapping);
160 goto err_config_cleanup;
161 }
162
163 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
164 if (ret)
165 goto err_release_mapping;
166
167 dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
168
169 ret = arm_iommu_attach_device(dev, mapping);
170 if (ret)
171 goto err_release_mapping;
172
173 /* Try to bind all sub drivers. */
174 ret = component_bind_all(dev, drm_dev);
175 if (ret)
176 goto err_detach_device;
177
178 /*
179 * All components are now added, we can publish the connector sysfs
180 * entries to userspace. This will generate hotplug events and so
181 * userspace will expect to be able to access DRM at this point.
182 */
183 list_for_each_entry(connector, &drm_dev->mode_config.connector_list,
184 head) {
185 ret = drm_connector_register(connector);
186 if (ret) {
187 dev_err(drm_dev->dev,
188 "[CONNECTOR:%d:%s] drm_connector_register failed: %d\n",
189 connector->base.id,
190 connector->name, ret);
191 goto err_unbind;
192 }
193 }
194
195 /* init kms poll for handling hpd */
196 drm_kms_helper_poll_init(drm_dev);
197
198 /*
199 * enable drm irq mode.
200 * - with irq_enabled = true, we can use the vblank feature.
201 */
202 drm_dev->irq_enabled = true;
203
204 ret = drm_vblank_init(drm_dev, ROCKCHIP_MAX_CRTC);
205 if (ret)
206 goto err_kms_helper_poll_fini;
207
208 /*
209 * with vblank_disable_allowed = true, vblank interrupt will be disabled
210 * by drm timer once a current process gives up ownership of
211 * vblank event.(after drm_vblank_put function is called)
212 */
213 drm_dev->vblank_disable_allowed = true;
214
215 drm_mode_config_reset(drm_dev);
216
217 ret = rockchip_drm_fbdev_init(drm_dev);
218 if (ret)
219 goto err_vblank_cleanup;
220
221 return 0;
222err_vblank_cleanup:
223 drm_vblank_cleanup(drm_dev);
224err_kms_helper_poll_fini:
225 drm_kms_helper_poll_fini(drm_dev);
226err_unbind:
227 component_unbind_all(dev, drm_dev);
228err_detach_device:
229 arm_iommu_detach_device(dev);
230err_release_mapping:
231 arm_iommu_release_mapping(dev->archdata.mapping);
232err_config_cleanup:
233 drm_mode_config_cleanup(drm_dev);
234 drm_dev->dev_private = NULL;
235 return ret;
236}
237
238static int rockchip_drm_unload(struct drm_device *drm_dev)
239{
240 struct device *dev = drm_dev->dev;
241
242 rockchip_drm_fbdev_fini(drm_dev);
243 drm_vblank_cleanup(drm_dev);
244 drm_kms_helper_poll_fini(drm_dev);
245 component_unbind_all(dev, drm_dev);
246 arm_iommu_detach_device(dev);
247 arm_iommu_release_mapping(dev->archdata.mapping);
248 drm_mode_config_cleanup(drm_dev);
249 drm_dev->dev_private = NULL;
250
251 return 0;
252}
253
254static void rockchip_drm_crtc_cancel_pending_vblank(struct drm_crtc *crtc,
255 struct drm_file *file_priv)
256{
257 struct rockchip_drm_private *priv = crtc->dev->dev_private;
258 int pipe = drm_crtc_index(crtc);
259
260 if (pipe < ROCKCHIP_MAX_CRTC &&
261 priv->crtc_funcs[pipe] &&
262 priv->crtc_funcs[pipe]->cancel_pending_vblank)
263 priv->crtc_funcs[pipe]->cancel_pending_vblank(crtc, file_priv);
264}
265
266static void rockchip_drm_preclose(struct drm_device *dev,
267 struct drm_file *file_priv)
268{
269 struct drm_crtc *crtc;
270
271 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
272 rockchip_drm_crtc_cancel_pending_vblank(crtc, file_priv);
273}
274
275void rockchip_drm_lastclose(struct drm_device *dev)
276{
277 struct rockchip_drm_private *priv = dev->dev_private;
278
279 drm_fb_helper_restore_fbdev_mode_unlocked(&priv->fbdev_helper);
280}
281
282static const struct file_operations rockchip_drm_driver_fops = {
283 .owner = THIS_MODULE,
284 .open = drm_open,
285 .mmap = rockchip_gem_mmap,
286 .poll = drm_poll,
287 .read = drm_read,
288 .unlocked_ioctl = drm_ioctl,
289#ifdef CONFIG_COMPAT
290 .compat_ioctl = drm_compat_ioctl,
291#endif
292 .release = drm_release,
293};
294
295const struct vm_operations_struct rockchip_drm_vm_ops = {
296 .open = drm_gem_vm_open,
297 .close = drm_gem_vm_close,
298};
299
300static struct drm_driver rockchip_drm_driver = {
301 .driver_features = DRIVER_MODESET | DRIVER_GEM |
302 DRIVER_PRIME | DRIVER_ATOMIC,
303 .load = rockchip_drm_load,
304 .unload = rockchip_drm_unload,
305 .preclose = rockchip_drm_preclose,
306 .lastclose = rockchip_drm_lastclose,
307 .get_vblank_counter = drm_vblank_no_hw_counter,
308 .enable_vblank = rockchip_drm_crtc_enable_vblank,
309 .disable_vblank = rockchip_drm_crtc_disable_vblank,
310 .gem_vm_ops = &rockchip_drm_vm_ops,
311 .gem_free_object = rockchip_gem_free_object,
312 .dumb_create = rockchip_gem_dumb_create,
313 .dumb_map_offset = rockchip_gem_dumb_map_offset,
314 .dumb_destroy = drm_gem_dumb_destroy,
315 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
316 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
317 .gem_prime_import = drm_gem_prime_import,
318 .gem_prime_export = drm_gem_prime_export,
319 .gem_prime_get_sg_table = rockchip_gem_prime_get_sg_table,
320 .gem_prime_vmap = rockchip_gem_prime_vmap,
321 .gem_prime_vunmap = rockchip_gem_prime_vunmap,
322 .gem_prime_mmap = rockchip_gem_mmap_buf,
323 .fops = &rockchip_drm_driver_fops,
324 .name = DRIVER_NAME,
325 .desc = DRIVER_DESC,
326 .date = DRIVER_DATE,
327 .major = DRIVER_MAJOR,
328 .minor = DRIVER_MINOR,
329};
330
331#ifdef CONFIG_PM_SLEEP
332static int rockchip_drm_sys_suspend(struct device *dev)
333{
334 struct drm_device *drm = dev_get_drvdata(dev);
335 struct drm_connector *connector;
336
337 if (!drm)
338 return 0;
339
340 drm_modeset_lock_all(drm);
341 list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
342 int old_dpms = connector->dpms;
343
344 if (connector->funcs->dpms)
345 connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF);
346
347 /* Set the old mode back to the connector for resume */
348 connector->dpms = old_dpms;
349 }
350 drm_modeset_unlock_all(drm);
351
352 return 0;
353}
354
355static int rockchip_drm_sys_resume(struct device *dev)
356{
357 struct drm_device *drm = dev_get_drvdata(dev);
358 struct drm_connector *connector;
359 enum drm_connector_status status;
360 bool changed = false;
361
362 if (!drm)
363 return 0;
364
365 drm_modeset_lock_all(drm);
366 list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
367 int desired_mode = connector->dpms;
368
369 /*
370 * at suspend time, we save dpms to connector->dpms,
371 * restore the old_dpms, and at current time, the connector
372 * dpms status must be DRM_MODE_DPMS_OFF.
373 */
374 connector->dpms = DRM_MODE_DPMS_OFF;
375
376 /*
377 * If the connector has been disconnected during suspend,
378 * disconnect it from the encoder and leave it off. We'll notify
379 * userspace at the end.
380 */
381 if (desired_mode == DRM_MODE_DPMS_ON) {
382 status = connector->funcs->detect(connector, true);
383 if (status == connector_status_disconnected) {
384 connector->encoder = NULL;
385 connector->status = status;
386 changed = true;
387 continue;
388 }
389 }
390 if (connector->funcs->dpms)
391 connector->funcs->dpms(connector, desired_mode);
392 }
393 drm_modeset_unlock_all(drm);
394
395 drm_helper_resume_force_mode(drm);
396
397 if (changed)
398 drm_kms_helper_hotplug_event(drm);
399
400 return 0;
401}
402#endif
403
404static const struct dev_pm_ops rockchip_drm_pm_ops = {
405 SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
406 rockchip_drm_sys_resume)
407};
408
409static int compare_of(struct device *dev, void *data)
410{
411 struct device_node *np = data;
412
413 return dev->of_node == np;
414}
415
416static void rockchip_add_endpoints(struct device *dev,
417 struct component_match **match,
418 struct device_node *port)
419{
420 struct device_node *ep, *remote;
421
422 for_each_child_of_node(port, ep) {
423 remote = of_graph_get_remote_port_parent(ep);
424 if (!remote || !of_device_is_available(remote)) {
425 of_node_put(remote);
426 continue;
427 } else if (!of_device_is_available(remote->parent)) {
428 dev_warn(dev, "parent device of %s is not available\n",
429 remote->full_name);
430 of_node_put(remote);
431 continue;
432 }
433
434 component_match_add(dev, match, compare_of, remote);
435 of_node_put(remote);
436 }
437}
438
439static int rockchip_drm_bind(struct device *dev)
440{
441 struct drm_device *drm;
442 int ret;
443
444 drm = drm_dev_alloc(&rockchip_drm_driver, dev);
445 if (!drm)
446 return -ENOMEM;
447
448 ret = drm_dev_register(drm, 0);
449 if (ret)
450 goto err_free;
451
452 dev_set_drvdata(dev, drm);
453
454 return 0;
455
456err_free:
457 drm_dev_unref(drm);
458 return ret;
459}
460
461static void rockchip_drm_unbind(struct device *dev)
462{
463 struct drm_device *drm = dev_get_drvdata(dev);
464
465 drm_dev_unregister(drm);
466 drm_dev_unref(drm);
467 dev_set_drvdata(dev, NULL);
468}
469
470static const struct component_master_ops rockchip_drm_ops = {
471 .bind = rockchip_drm_bind,
472 .unbind = rockchip_drm_unbind,
473};
474
475static int rockchip_drm_platform_probe(struct platform_device *pdev)
476{
477 struct device *dev = &pdev->dev;
478 struct component_match *match = NULL;
479 struct device_node *np = dev->of_node;
480 struct device_node *port;
481 int i;
482
483 if (!np)
484 return -ENODEV;
485 /*
486 * Bind the crtc ports first, so that
487 * drm_of_find_possible_crtcs called from encoder .bind callbacks
488 * works as expected.
489 */
490 for (i = 0;; i++) {
491 port = of_parse_phandle(np, "ports", i);
492 if (!port)
493 break;
494
495 if (!of_device_is_available(port->parent)) {
496 of_node_put(port);
497 continue;
498 }
499
500 component_match_add(dev, &match, compare_of, port->parent);
501 of_node_put(port);
502 }
503
504 if (i == 0) {
505 dev_err(dev, "missing 'ports' property\n");
506 return -ENODEV;
507 }
508
509 if (!match) {
510 dev_err(dev, "No available vop found for display-subsystem.\n");
511 return -ENODEV;
512 }
513 /*
514 * For each bound crtc, bind the encoders attached to its
515 * remote endpoint.
516 */
517 for (i = 0;; i++) {
518 port = of_parse_phandle(np, "ports", i);
519 if (!port)
520 break;
521
522 if (!of_device_is_available(port->parent)) {
523 of_node_put(port);
524 continue;
525 }
526
527 rockchip_add_endpoints(dev, &match, port);
528 of_node_put(port);
529 }
530
531 return component_master_add_with_match(dev, &rockchip_drm_ops, match);
532}
533
534static int rockchip_drm_platform_remove(struct platform_device *pdev)
535{
536 component_master_del(&pdev->dev, &rockchip_drm_ops);
537
538 return 0;
539}
540
541static const struct of_device_id rockchip_drm_dt_ids[] = {
542 { .compatible = "rockchip,display-subsystem", },
543 { /* sentinel */ },
544};
545MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
546
547static struct platform_driver rockchip_drm_platform_driver = {
548 .probe = rockchip_drm_platform_probe,
549 .remove = rockchip_drm_platform_remove,
550 .driver = {
551 .name = "rockchip-drm",
552 .of_match_table = rockchip_drm_dt_ids,
553 .pm = &rockchip_drm_pm_ops,
554 },
555};
556
557module_platform_driver(rockchip_drm_platform_driver);
558
559MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
560MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
561MODULE_LICENSE("GPL v2");