1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
4  * Author: James.Qian.Wang <james.qian.wang@arm.com>
5  *
6  */
7 #include <linux/module.h>
8 #include <linux/kernel.h>
9 #include <linux/platform_device.h>
10 #include <linux/component.h>
11 #include <linux/pm_runtime.h>
12 #include <drm/drm_of.h>
13 #include "komeda_dev.h"
14 #include "komeda_kms.h"
15 
16 struct komeda_drv {
17 	struct komeda_dev *mdev;
18 	struct komeda_kms_dev *kms;
19 };
20 
21 struct komeda_dev *dev_to_mdev(struct device *dev)
22 {
23 	struct komeda_drv *mdrv = dev_get_drvdata(dev);
24 
25 	return mdrv ? mdrv->mdev : NULL;
26 }
27 
28 static void komeda_unbind(struct device *dev)
29 {
30 	struct komeda_drv *mdrv = dev_get_drvdata(dev);
31 
32 	if (!mdrv)
33 		return;
34 
35 	komeda_kms_detach(mdrv->kms);
36 
37 	if (pm_runtime_enabled(dev))
38 		pm_runtime_disable(dev);
39 	else
40 		komeda_dev_suspend(mdrv->mdev);
41 
42 	komeda_dev_destroy(mdrv->mdev);
43 
44 	dev_set_drvdata(dev, NULL);
45 	devm_kfree(dev, mdrv);
46 }
47 
48 static int komeda_bind(struct device *dev)
49 {
50 	struct komeda_drv *mdrv;
51 	int err;
52 
53 	mdrv = devm_kzalloc(dev, sizeof(*mdrv), GFP_KERNEL);
54 	if (!mdrv)
55 		return -ENOMEM;
56 
57 	mdrv->mdev = komeda_dev_create(dev);
58 	if (IS_ERR(mdrv->mdev)) {
59 		err = PTR_ERR(mdrv->mdev);
60 		goto free_mdrv;
61 	}
62 
63 	pm_runtime_enable(dev);
64 	if (!pm_runtime_enabled(dev))
65 		komeda_dev_resume(mdrv->mdev);
66 
67 	mdrv->kms = komeda_kms_attach(mdrv->mdev);
68 	if (IS_ERR(mdrv->kms)) {
69 		err = PTR_ERR(mdrv->kms);
70 		goto destroy_mdev;
71 	}
72 
73 	dev_set_drvdata(dev, mdrv);
74 
75 	return 0;
76 
77 destroy_mdev:
78 	if (pm_runtime_enabled(dev))
79 		pm_runtime_disable(dev);
80 	else
81 		komeda_dev_suspend(mdrv->mdev);
82 
83 	komeda_dev_destroy(mdrv->mdev);
84 
85 free_mdrv:
86 	devm_kfree(dev, mdrv);
87 	return err;
88 }
89 
90 static const struct component_master_ops komeda_master_ops = {
91 	.bind	= komeda_bind,
92 	.unbind	= komeda_unbind,
93 };
94 
95 static int compare_of(struct device *dev, void *data)
96 {
97 	return dev->of_node == data;
98 }
99 
100 static void komeda_add_slave(struct device *master,
101 			     struct component_match **match,
102 			     struct device_node *np,
103 			     u32 port, u32 endpoint)
104 {
105 	struct device_node *remote;
106 
107 	remote = of_graph_get_remote_node(np, port, endpoint);
108 	if (remote) {
109 		drm_of_component_match_add(master, match, compare_of, remote);
110 		of_node_put(remote);
111 	}
112 }
113 
114 static int komeda_platform_probe(struct platform_device *pdev)
115 {
116 	struct device *dev = &pdev->dev;
117 	struct component_match *match = NULL;
118 	struct device_node *child;
119 
120 	if (!dev->of_node)
121 		return -ENODEV;
122 
123 	for_each_available_child_of_node(dev->of_node, child) {
124 		if (of_node_cmp(child->name, "pipeline") != 0)
125 			continue;
126 
127 		/* add connector */
128 		komeda_add_slave(dev, &match, child, KOMEDA_OF_PORT_OUTPUT, 0);
129 		komeda_add_slave(dev, &match, child, KOMEDA_OF_PORT_OUTPUT, 1);
130 	}
131 
132 	return component_master_add_with_match(dev, &komeda_master_ops, match);
133 }
134 
135 static int komeda_platform_remove(struct platform_device *pdev)
136 {
137 	component_master_del(&pdev->dev, &komeda_master_ops);
138 	return 0;
139 }
140 
141 static const struct of_device_id komeda_of_match[] = {
142 	{ .compatible = "arm,mali-d71", .data = d71_identify, },
143 	{ .compatible = "arm,mali-d32", .data = d71_identify, },
144 	{},
145 };
146 
147 MODULE_DEVICE_TABLE(of, komeda_of_match);
148 
149 static int __maybe_unused komeda_rt_pm_suspend(struct device *dev)
150 {
151 	struct komeda_drv *mdrv = dev_get_drvdata(dev);
152 
153 	return komeda_dev_suspend(mdrv->mdev);
154 }
155 
156 static int __maybe_unused komeda_rt_pm_resume(struct device *dev)
157 {
158 	struct komeda_drv *mdrv = dev_get_drvdata(dev);
159 
160 	return komeda_dev_resume(mdrv->mdev);
161 }
162 
163 static int __maybe_unused komeda_pm_suspend(struct device *dev)
164 {
165 	struct komeda_drv *mdrv = dev_get_drvdata(dev);
166 	int res;
167 
168 	res = drm_mode_config_helper_suspend(&mdrv->kms->base);
169 
170 	if (!pm_runtime_status_suspended(dev))
171 		komeda_dev_suspend(mdrv->mdev);
172 
173 	return res;
174 }
175 
176 static int __maybe_unused komeda_pm_resume(struct device *dev)
177 {
178 	struct komeda_drv *mdrv = dev_get_drvdata(dev);
179 
180 	if (!pm_runtime_status_suspended(dev))
181 		komeda_dev_resume(mdrv->mdev);
182 
183 	return drm_mode_config_helper_resume(&mdrv->kms->base);
184 }
185 
186 static const struct dev_pm_ops komeda_pm_ops = {
187 	SET_SYSTEM_SLEEP_PM_OPS(komeda_pm_suspend, komeda_pm_resume)
188 	SET_RUNTIME_PM_OPS(komeda_rt_pm_suspend, komeda_rt_pm_resume, NULL)
189 };
190 
191 static struct platform_driver komeda_platform_driver = {
192 	.probe	= komeda_platform_probe,
193 	.remove	= komeda_platform_remove,
194 	.driver	= {
195 		.name = "komeda",
196 		.of_match_table	= komeda_of_match,
197 		.pm = &komeda_pm_ops,
198 	},
199 };
200 
201 module_platform_driver(komeda_platform_driver);
202 
203 MODULE_AUTHOR("James.Qian.Wang <james.qian.wang@arm.com>");
204 MODULE_DESCRIPTION("Komeda KMS driver");
205 MODULE_LICENSE("GPL v2");
206