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