1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2020 Unisoc Inc.
6 #include <linux/component.h>
7 #include <linux/dma-mapping.h>
8 #include <linux/module.h>
9 #include <linux/mutex.h>
10 #include <linux/of_graph.h>
11 #include <linux/of_platform.h>
13 #include <drm/drm_atomic_helper.h>
14 #include <drm/drm_crtc_helper.h>
15 #include <drm/drm_drv.h>
16 #include <drm/drm_gem_cma_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>
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
30 static const struct drm_mode_config_helper_funcs sprd_drm_mode_config_helper = {
31 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
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,
40 static void sprd_drm_mode_config_init(struct drm_device *drm)
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 drm->mode_config.allow_fb_modifiers = true;
48 drm->mode_config.funcs = &sprd_drm_mode_config_funcs;
49 drm->mode_config.helper_private = &sprd_drm_mode_config_helper;
52 DEFINE_DRM_GEM_CMA_FOPS(sprd_drm_fops);
54 static struct drm_driver sprd_drm_drv = {
55 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
56 .fops = &sprd_drm_fops,
59 DRM_GEM_CMA_DRIVER_OPS,
64 .major = DRIVER_MAJOR,
65 .minor = DRIVER_MINOR,
68 static int sprd_drm_bind(struct device *dev)
70 struct platform_device *pdev = to_platform_device(dev);
71 struct drm_device *drm;
72 struct sprd_drm *sprd;
75 sprd = devm_drm_dev_alloc(dev, &sprd_drm_drv, struct sprd_drm, drm);
80 platform_set_drvdata(pdev, drm);
82 ret = drmm_mode_config_init(drm);
86 sprd_drm_mode_config_init(drm);
88 /* bind and init sub drivers */
89 ret = component_bind_all(drm->dev, drm);
91 drm_err(drm, "failed to bind all component.\n");
96 ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
98 drm_err(drm, "failed to initialize vblank.\n");
102 /* reset all the states of crtc/plane/encoder/connector */
103 drm_mode_config_reset(drm);
105 /* init kms poll for handling hpd */
106 drm_kms_helper_poll_init(drm);
108 ret = drm_dev_register(drm, 0);
110 goto err_kms_helper_poll_fini;
114 err_kms_helper_poll_fini:
115 drm_kms_helper_poll_fini(drm);
117 component_unbind_all(drm->dev, drm);
121 static void sprd_drm_unbind(struct device *dev)
123 struct drm_device *drm = dev_get_drvdata(dev);
125 drm_dev_unregister(drm);
127 drm_kms_helper_poll_fini(drm);
129 component_unbind_all(drm->dev, drm);
132 static const struct component_master_ops drm_component_ops = {
133 .bind = sprd_drm_bind,
134 .unbind = sprd_drm_unbind,
137 static int compare_of(struct device *dev, void *data)
139 return dev->of_node == data;
142 static int sprd_drm_probe(struct platform_device *pdev)
144 return drm_of_component_probe(&pdev->dev, compare_of, &drm_component_ops);
147 static int sprd_drm_remove(struct platform_device *pdev)
149 component_master_del(&pdev->dev, &drm_component_ops);
153 static void sprd_drm_shutdown(struct platform_device *pdev)
155 struct drm_device *drm = platform_get_drvdata(pdev);
158 drm_warn(drm, "drm device is not available, no shutdown\n");
162 drm_atomic_helper_shutdown(drm);
165 static const struct of_device_id drm_match_table[] = {
166 { .compatible = "sprd,display-subsystem", },
169 MODULE_DEVICE_TABLE(of, drm_match_table);
171 static struct platform_driver sprd_drm_driver = {
172 .probe = sprd_drm_probe,
173 .remove = sprd_drm_remove,
174 .shutdown = sprd_drm_shutdown,
176 .name = "sprd-drm-drv",
177 .of_match_table = drm_match_table,
181 static struct platform_driver *sprd_drm_drivers[] = {
187 static int __init sprd_drm_init(void)
189 return platform_register_drivers(sprd_drm_drivers,
190 ARRAY_SIZE(sprd_drm_drivers));
193 static void __exit sprd_drm_exit(void)
195 platform_unregister_drivers(sprd_drm_drivers,
196 ARRAY_SIZE(sprd_drm_drivers));
199 module_init(sprd_drm_init);
200 module_exit(sprd_drm_exit);
204 MODULE_DESCRIPTION("Unisoc DRM KMS Master Driver");
205 MODULE_LICENSE("GPL v2");