1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2020 Unisoc Inc.
4 */
5
6#include <linux/component.h>
7#include <linux/dma-mapping.h>
8#include <linux/mod_devicetable.h>
9#include <linux/module.h>
10#include <linux/mutex.h>
11#include <linux/of_graph.h>
12#include <linux/platform_device.h>
13
14#include <drm/drm_atomic_helper.h>
15#include <drm/drm_drv.h>
16#include <drm/drm_gem_dma_helper.h>
17#include <drm/drm_gem_framebuffer_helper.h>
18#include <drm/drm_of.h>
19#include <drm/drm_probe_helper.h>
20#include <drm/drm_vblank.h>
21
22#include "sprd_drm.h"
23
24#define DRIVER_NAME	"sprd"
25#define DRIVER_DESC	"Spreadtrum SoCs' DRM Driver"
26#define DRIVER_DATE	"20200201"
27#define DRIVER_MAJOR	1
28#define DRIVER_MINOR	0
29
30static const struct drm_mode_config_helper_funcs sprd_drm_mode_config_helper = {
31	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
32};
33
34static const struct drm_mode_config_funcs sprd_drm_mode_config_funcs = {
35	.fb_create = drm_gem_fb_create,
36	.atomic_check = drm_atomic_helper_check,
37	.atomic_commit = drm_atomic_helper_commit,
38};
39
40static void sprd_drm_mode_config_init(struct drm_device *drm)
41{
42	drm->mode_config.min_width = 0;
43	drm->mode_config.min_height = 0;
44	drm->mode_config.max_width = 8192;
45	drm->mode_config.max_height = 8192;
46
47	drm->mode_config.funcs = &sprd_drm_mode_config_funcs;
48	drm->mode_config.helper_private = &sprd_drm_mode_config_helper;
49}
50
51DEFINE_DRM_GEM_DMA_FOPS(sprd_drm_fops);
52
53static struct drm_driver sprd_drm_drv = {
54	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
55	.fops			= &sprd_drm_fops,
56
57	/* GEM Operations */
58	DRM_GEM_DMA_DRIVER_OPS,
59
60	.name			= DRIVER_NAME,
61	.desc			= DRIVER_DESC,
62	.date			= DRIVER_DATE,
63	.major			= DRIVER_MAJOR,
64	.minor			= DRIVER_MINOR,
65};
66
67static int sprd_drm_bind(struct device *dev)
68{
69	struct platform_device *pdev = to_platform_device(dev);
70	struct drm_device *drm;
71	struct sprd_drm *sprd;
72	int ret;
73
74	sprd = devm_drm_dev_alloc(dev, &sprd_drm_drv, struct sprd_drm, drm);
75	if (IS_ERR(sprd))
76		return PTR_ERR(sprd);
77
78	drm = &sprd->drm;
79	platform_set_drvdata(pdev, drm);
80
81	ret = drmm_mode_config_init(drm);
82	if (ret)
83		return ret;
84
85	sprd_drm_mode_config_init(drm);
86
87	/* bind and init sub drivers */
88	ret = component_bind_all(drm->dev, drm);
89	if (ret) {
90		drm_err(drm, "failed to bind all component.\n");
91		return ret;
92	}
93
94	/* vblank init */
95	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
96	if (ret) {
97		drm_err(drm, "failed to initialize vblank.\n");
98		goto err_unbind_all;
99	}
100
101	/* reset all the states of crtc/plane/encoder/connector */
102	drm_mode_config_reset(drm);
103
104	/* init kms poll for handling hpd */
105	drm_kms_helper_poll_init(drm);
106
107	ret = drm_dev_register(drm, 0);
108	if (ret < 0)
109		goto err_kms_helper_poll_fini;
110
111	return 0;
112
113err_kms_helper_poll_fini:
114	drm_kms_helper_poll_fini(drm);
115err_unbind_all:
116	component_unbind_all(drm->dev, drm);
117	return ret;
118}
119
120static void sprd_drm_unbind(struct device *dev)
121{
122	struct drm_device *drm = dev_get_drvdata(dev);
123
124	drm_dev_unregister(drm);
125
126	drm_kms_helper_poll_fini(drm);
127
128	component_unbind_all(drm->dev, drm);
129}
130
131static const struct component_master_ops drm_component_ops = {
132	.bind = sprd_drm_bind,
133	.unbind = sprd_drm_unbind,
134};
135
136static int sprd_drm_probe(struct platform_device *pdev)
137{
138	return drm_of_component_probe(&pdev->dev, component_compare_of, &drm_component_ops);
139}
140
141static void sprd_drm_remove(struct platform_device *pdev)
142{
143	component_master_del(&pdev->dev, &drm_component_ops);
144}
145
146static void sprd_drm_shutdown(struct platform_device *pdev)
147{
148	struct drm_device *drm = platform_get_drvdata(pdev);
149
150	if (!drm) {
151		dev_warn(&pdev->dev, "drm device is not available, no shutdown\n");
152		return;
153	}
154
155	drm_atomic_helper_shutdown(drm);
156}
157
158static const struct of_device_id drm_match_table[] = {
159	{ .compatible = "sprd,display-subsystem", },
160	{ /* sentinel */ },
161};
162MODULE_DEVICE_TABLE(of, drm_match_table);
163
164static struct platform_driver sprd_drm_driver = {
165	.probe = sprd_drm_probe,
166	.remove_new = sprd_drm_remove,
167	.shutdown = sprd_drm_shutdown,
168	.driver = {
169		.name = "sprd-drm-drv",
170		.of_match_table = drm_match_table,
171	},
172};
173
174static struct platform_driver *sprd_drm_drivers[]  = {
175	&sprd_drm_driver,
176	&sprd_dpu_driver,
177	&sprd_dsi_driver,
178};
179
180static int __init sprd_drm_init(void)
181{
182	if (drm_firmware_drivers_only())
183		return -ENODEV;
184
185	return platform_register_drivers(sprd_drm_drivers,
186					ARRAY_SIZE(sprd_drm_drivers));
187}
188
189static void __exit sprd_drm_exit(void)
190{
191	platform_unregister_drivers(sprd_drm_drivers,
192				    ARRAY_SIZE(sprd_drm_drivers));
193}
194
195module_init(sprd_drm_init);
196module_exit(sprd_drm_exit);
197
198MODULE_AUTHOR("Leon He <leon.he@unisoc.com>");
199MODULE_AUTHOR("Kevin Tang <kevin.tang@unisoc.com>");
200MODULE_DESCRIPTION("Unisoc DRM KMS Master Driver");
201MODULE_LICENSE("GPL v2");
202