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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_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
38static bool is_support_iommu = true;
39static 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 */
46int 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
64void 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
76static 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
101static 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
112static 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-fb");
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 INIT_LIST_HEAD(&private->psr_list);
142 mutex_init(&private->psr_list_lock);
143
144 ret = rockchip_drm_init_iommu(drm_dev);
145 if (ret)
146 goto err_free;
147
148 ret = drmm_mode_config_init(drm_dev);
149 if (ret)
150 goto err_iommu_cleanup;
151
152 rockchip_drm_mode_config_init(drm_dev);
153
154 /* Try to bind all sub drivers. */
155 ret = component_bind_all(dev, drm_dev);
156 if (ret)
157 goto err_iommu_cleanup;
158
159 ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
160 if (ret)
161 goto err_unbind_all;
162
163 drm_mode_config_reset(drm_dev);
164
165 /*
166 * enable drm irq mode.
167 * - with irq_enabled = true, we can use the vblank feature.
168 */
169 drm_dev->irq_enabled = true;
170
171 ret = rockchip_drm_fbdev_init(drm_dev);
172 if (ret)
173 goto err_unbind_all;
174
175 /* init kms poll for handling hpd */
176 drm_kms_helper_poll_init(drm_dev);
177
178 ret = drm_dev_register(drm_dev, 0);
179 if (ret)
180 goto err_kms_helper_poll_fini;
181
182 return 0;
183err_kms_helper_poll_fini:
184 drm_kms_helper_poll_fini(drm_dev);
185 rockchip_drm_fbdev_fini(drm_dev);
186err_unbind_all:
187 component_unbind_all(dev, drm_dev);
188err_iommu_cleanup:
189 rockchip_iommu_cleanup(drm_dev);
190err_free:
191 drm_dev_put(drm_dev);
192 return ret;
193}
194
195static void rockchip_drm_unbind(struct device *dev)
196{
197 struct drm_device *drm_dev = dev_get_drvdata(dev);
198
199 drm_dev_unregister(drm_dev);
200
201 rockchip_drm_fbdev_fini(drm_dev);
202 drm_kms_helper_poll_fini(drm_dev);
203
204 drm_atomic_helper_shutdown(drm_dev);
205 component_unbind_all(dev, drm_dev);
206 rockchip_iommu_cleanup(drm_dev);
207
208 drm_dev_put(drm_dev);
209}
210
211static const struct file_operations rockchip_drm_driver_fops = {
212 .owner = THIS_MODULE,
213 .open = drm_open,
214 .mmap = rockchip_gem_mmap,
215 .poll = drm_poll,
216 .read = drm_read,
217 .unlocked_ioctl = drm_ioctl,
218 .compat_ioctl = drm_compat_ioctl,
219 .release = drm_release,
220};
221
222static const struct drm_driver rockchip_drm_driver = {
223 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
224 .lastclose = drm_fb_helper_lastclose,
225 .dumb_create = rockchip_gem_dumb_create,
226 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
227 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
228 .gem_prime_import_sg_table = rockchip_gem_prime_import_sg_table,
229 .gem_prime_mmap = rockchip_gem_mmap_buf,
230 .fops = &rockchip_drm_driver_fops,
231 .name = DRIVER_NAME,
232 .desc = DRIVER_DESC,
233 .date = DRIVER_DATE,
234 .major = DRIVER_MAJOR,
235 .minor = DRIVER_MINOR,
236};
237
238#ifdef CONFIG_PM_SLEEP
239static int rockchip_drm_sys_suspend(struct device *dev)
240{
241 struct drm_device *drm = dev_get_drvdata(dev);
242
243 return drm_mode_config_helper_suspend(drm);
244}
245
246static int rockchip_drm_sys_resume(struct device *dev)
247{
248 struct drm_device *drm = dev_get_drvdata(dev);
249
250 return drm_mode_config_helper_resume(drm);
251}
252#endif
253
254static const struct dev_pm_ops rockchip_drm_pm_ops = {
255 SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
256 rockchip_drm_sys_resume)
257};
258
259#define MAX_ROCKCHIP_SUB_DRIVERS 16
260static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS];
261static int num_rockchip_sub_drivers;
262
263/*
264 * Check if a vop endpoint is leading to a rockchip subdriver or bridge.
265 * Should be called from the component bind stage of the drivers
266 * to ensure that all subdrivers are probed.
267 *
268 * @ep: endpoint of a rockchip vop
269 *
270 * returns true if subdriver, false if external bridge and -ENODEV
271 * if remote port does not contain a device.
272 */
273int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
274{
275 struct device_node *node = of_graph_get_remote_port_parent(ep);
276 struct platform_device *pdev;
277 struct device_driver *drv;
278 int i;
279
280 if (!node)
281 return -ENODEV;
282
283 /* status disabled will prevent creation of platform-devices */
284 pdev = of_find_device_by_node(node);
285 of_node_put(node);
286 if (!pdev)
287 return -ENODEV;
288
289 /*
290 * All rockchip subdrivers have probed at this point, so
291 * any device not having a driver now is an external bridge.
292 */
293 drv = pdev->dev.driver;
294 if (!drv) {
295 platform_device_put(pdev);
296 return false;
297 }
298
299 for (i = 0; i < num_rockchip_sub_drivers; i++) {
300 if (rockchip_sub_drivers[i] == to_platform_driver(drv)) {
301 platform_device_put(pdev);
302 return true;
303 }
304 }
305
306 platform_device_put(pdev);
307 return false;
308}
309
310static int compare_dev(struct device *dev, void *data)
311{
312 return dev == (struct device *)data;
313}
314
315static void rockchip_drm_match_remove(struct device *dev)
316{
317 struct device_link *link;
318
319 list_for_each_entry(link, &dev->links.consumers, s_node)
320 device_link_del(link);
321}
322
323static struct component_match *rockchip_drm_match_add(struct device *dev)
324{
325 struct component_match *match = NULL;
326 int i;
327
328 for (i = 0; i < num_rockchip_sub_drivers; i++) {
329 struct platform_driver *drv = rockchip_sub_drivers[i];
330 struct device *p = NULL, *d;
331
332 do {
333 d = platform_find_device_by_driver(p, &drv->driver);
334 put_device(p);
335 p = d;
336
337 if (!d)
338 break;
339
340 device_link_add(dev, d, DL_FLAG_STATELESS);
341 component_match_add(dev, &match, compare_dev, d);
342 } while (true);
343 }
344
345 if (IS_ERR(match))
346 rockchip_drm_match_remove(dev);
347
348 return match ?: ERR_PTR(-ENODEV);
349}
350
351static const struct component_master_ops rockchip_drm_ops = {
352 .bind = rockchip_drm_bind,
353 .unbind = rockchip_drm_unbind,
354};
355
356static int rockchip_drm_platform_of_probe(struct device *dev)
357{
358 struct device_node *np = dev->of_node;
359 struct device_node *port;
360 bool found = false;
361 int i;
362
363 if (!np)
364 return -ENODEV;
365
366 for (i = 0;; i++) {
367 struct device_node *iommu;
368
369 port = of_parse_phandle(np, "ports", i);
370 if (!port)
371 break;
372
373 if (!of_device_is_available(port->parent)) {
374 of_node_put(port);
375 continue;
376 }
377
378 iommu = of_parse_phandle(port->parent, "iommus", 0);
379 if (!iommu || !of_device_is_available(iommu->parent)) {
380 DRM_DEV_DEBUG(dev,
381 "no iommu attached for %pOF, using non-iommu buffers\n",
382 port->parent);
383 /*
384 * if there is a crtc not support iommu, force set all
385 * crtc use non-iommu buffer.
386 */
387 is_support_iommu = false;
388 }
389
390 found = true;
391
392 of_node_put(iommu);
393 of_node_put(port);
394 }
395
396 if (i == 0) {
397 DRM_DEV_ERROR(dev, "missing 'ports' property\n");
398 return -ENODEV;
399 }
400
401 if (!found) {
402 DRM_DEV_ERROR(dev,
403 "No available vop found for display-subsystem.\n");
404 return -ENODEV;
405 }
406
407 return 0;
408}
409
410static int rockchip_drm_platform_probe(struct platform_device *pdev)
411{
412 struct device *dev = &pdev->dev;
413 struct component_match *match = NULL;
414 int ret;
415
416 ret = rockchip_drm_platform_of_probe(dev);
417 if (ret)
418 return ret;
419
420 match = rockchip_drm_match_add(dev);
421 if (IS_ERR(match))
422 return PTR_ERR(match);
423
424 ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
425 if (ret < 0) {
426 rockchip_drm_match_remove(dev);
427 return ret;
428 }
429
430 return 0;
431}
432
433static int rockchip_drm_platform_remove(struct platform_device *pdev)
434{
435 component_master_del(&pdev->dev, &rockchip_drm_ops);
436
437 rockchip_drm_match_remove(&pdev->dev);
438
439 return 0;
440}
441
442static void rockchip_drm_platform_shutdown(struct platform_device *pdev)
443{
444 struct drm_device *drm = platform_get_drvdata(pdev);
445
446 if (drm)
447 drm_atomic_helper_shutdown(drm);
448}
449
450static const struct of_device_id rockchip_drm_dt_ids[] = {
451 { .compatible = "rockchip,display-subsystem", },
452 { /* sentinel */ },
453};
454MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
455
456static struct platform_driver rockchip_drm_platform_driver = {
457 .probe = rockchip_drm_platform_probe,
458 .remove = rockchip_drm_platform_remove,
459 .shutdown = rockchip_drm_platform_shutdown,
460 .driver = {
461 .name = "rockchip-drm",
462 .of_match_table = rockchip_drm_dt_ids,
463 .pm = &rockchip_drm_pm_ops,
464 },
465};
466
467#define ADD_ROCKCHIP_SUB_DRIVER(drv, cond) { \
468 if (IS_ENABLED(cond) && \
469 !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \
470 rockchip_sub_drivers[num_rockchip_sub_drivers++] = &drv; \
471}
472
473static int __init rockchip_drm_init(void)
474{
475 int ret;
476
477 num_rockchip_sub_drivers = 0;
478 ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_DRM_ROCKCHIP);
479 ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver,
480 CONFIG_ROCKCHIP_LVDS);
481 ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver,
482 CONFIG_ROCKCHIP_ANALOGIX_DP);
483 ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
484 ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver,
485 CONFIG_ROCKCHIP_DW_HDMI);
486 ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver,
487 CONFIG_ROCKCHIP_DW_MIPI_DSI);
488 ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
489 ADD_ROCKCHIP_SUB_DRIVER(rk3066_hdmi_driver,
490 CONFIG_ROCKCHIP_RK3066_HDMI);
491
492 ret = platform_register_drivers(rockchip_sub_drivers,
493 num_rockchip_sub_drivers);
494 if (ret)
495 return ret;
496
497 ret = platform_driver_register(&rockchip_drm_platform_driver);
498 if (ret)
499 goto err_unreg_drivers;
500
501 return 0;
502
503err_unreg_drivers:
504 platform_unregister_drivers(rockchip_sub_drivers,
505 num_rockchip_sub_drivers);
506 return ret;
507}
508
509static void __exit rockchip_drm_fini(void)
510{
511 platform_driver_unregister(&rockchip_drm_platform_driver);
512
513 platform_unregister_drivers(rockchip_sub_drivers,
514 num_rockchip_sub_drivers);
515}
516
517module_init(rockchip_drm_init);
518module_exit(rockchip_drm_fini);
519
520MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
521MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
522MODULE_LICENSE("GPL v2");