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
30 static const struct drm_mode_config_helper_funcs sprd_drm_mode_config_helper = {
31 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
32 };
33
34 static 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
sprd_drm_mode_config_init(struct drm_device * drm)40 static 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
51 DEFINE_DRM_GEM_DMA_FOPS(sprd_drm_fops);
52
53 static 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
sprd_drm_bind(struct device * dev)67 static 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
113 err_kms_helper_poll_fini:
114 drm_kms_helper_poll_fini(drm);
115 err_unbind_all:
116 component_unbind_all(drm->dev, drm);
117 return ret;
118 }
119
sprd_drm_unbind(struct device * dev)120 static 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
131 static const struct component_master_ops drm_component_ops = {
132 .bind = sprd_drm_bind,
133 .unbind = sprd_drm_unbind,
134 };
135
sprd_drm_probe(struct platform_device * pdev)136 static 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
sprd_drm_remove(struct platform_device * pdev)141 static void sprd_drm_remove(struct platform_device *pdev)
142 {
143 component_master_del(&pdev->dev, &drm_component_ops);
144 }
145
sprd_drm_shutdown(struct platform_device * pdev)146 static 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
158 static const struct of_device_id drm_match_table[] = {
159 { .compatible = "sprd,display-subsystem", },
160 { /* sentinel */ },
161 };
162 MODULE_DEVICE_TABLE(of, drm_match_table);
163
164 static 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
174 static struct platform_driver *sprd_drm_drivers[] = {
175 &sprd_drm_driver,
176 &sprd_dpu_driver,
177 &sprd_dsi_driver,
178 };
179
sprd_drm_init(void)180 static 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
sprd_drm_exit(void)189 static void __exit sprd_drm_exit(void)
190 {
191 platform_unregister_drivers(sprd_drm_drivers,
192 ARRAY_SIZE(sprd_drm_drivers));
193 }
194
195 module_init(sprd_drm_init);
196 module_exit(sprd_drm_exit);
197
198 MODULE_AUTHOR("Leon He <leon.he@unisoc.com>");
199 MODULE_AUTHOR("Kevin Tang <kevin.tang@unisoc.com>");
200 MODULE_DESCRIPTION("Unisoc DRM KMS Master Driver");
201 MODULE_LICENSE("GPL v2");
202