1 /* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
2  *
3  * This program is free software; you can redistribute it and/or modify
4  * it under the terms of the GNU General Public License version 2 and
5  * only version 2 as published by the Free Software Foundation.
6  *
7  * This program is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10  * GNU General Public License for more details.
11  */
12 
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/device.h>
17 #include <linux/platform_device.h>
18 #include <linux/io.h>
19 #include <linux/err.h>
20 #include <linux/slab.h>
21 #include <linux/clk.h>
22 #include <linux/of.h>
23 #include <linux/coresight.h>
24 
25 #include "coresight-priv.h"
26 
27 /**
28  * struct replicator_drvdata - specifics associated to a replicator component
29  * @dev:	the device entity associated with this component
30  * @csdev:	component vitals needed by the framework
31  */
32 struct replicator_drvdata {
33 	struct device		*dev;
34 	struct coresight_device	*csdev;
35 };
36 
37 static int replicator_enable(struct coresight_device *csdev, int inport,
38 			     int outport)
39 {
40 	struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
41 
42 	dev_info(drvdata->dev, "REPLICATOR enabled\n");
43 	return 0;
44 }
45 
46 static void replicator_disable(struct coresight_device *csdev, int inport,
47 			       int outport)
48 {
49 	struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
50 
51 	dev_info(drvdata->dev, "REPLICATOR disabled\n");
52 }
53 
54 static const struct coresight_ops_link replicator_link_ops = {
55 	.enable		= replicator_enable,
56 	.disable	= replicator_disable,
57 };
58 
59 static const struct coresight_ops replicator_cs_ops = {
60 	.link_ops	= &replicator_link_ops,
61 };
62 
63 static int replicator_probe(struct platform_device *pdev)
64 {
65 	struct device *dev = &pdev->dev;
66 	struct coresight_platform_data *pdata = NULL;
67 	struct replicator_drvdata *drvdata;
68 	struct coresight_desc *desc;
69 	struct device_node *np = pdev->dev.of_node;
70 
71 	if (np) {
72 		pdata = of_get_coresight_platform_data(dev, np);
73 		if (IS_ERR(pdata))
74 			return PTR_ERR(pdata);
75 		pdev->dev.platform_data = pdata;
76 	}
77 
78 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
79 	if (!drvdata)
80 		return -ENOMEM;
81 
82 	drvdata->dev = &pdev->dev;
83 	platform_set_drvdata(pdev, drvdata);
84 
85 	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
86 	if (!desc)
87 		return -ENOMEM;
88 
89 	desc->type = CORESIGHT_DEV_TYPE_LINK;
90 	desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT;
91 	desc->ops = &replicator_cs_ops;
92 	desc->pdata = pdev->dev.platform_data;
93 	desc->dev = &pdev->dev;
94 	drvdata->csdev = coresight_register(desc);
95 	if (IS_ERR(drvdata->csdev))
96 		return PTR_ERR(drvdata->csdev);
97 
98 	dev_info(dev, "REPLICATOR initialized\n");
99 	return 0;
100 }
101 
102 static int replicator_remove(struct platform_device *pdev)
103 {
104 	struct replicator_drvdata *drvdata = platform_get_drvdata(pdev);
105 
106 	coresight_unregister(drvdata->csdev);
107 	return 0;
108 }
109 
110 static const struct of_device_id replicator_match[] = {
111 	{.compatible = "arm,coresight-replicator"},
112 	{}
113 };
114 
115 static struct platform_driver replicator_driver = {
116 	.probe          = replicator_probe,
117 	.remove         = replicator_remove,
118 	.driver         = {
119 		.name   = "coresight-replicator",
120 		.of_match_table = replicator_match,
121 	},
122 };
123 
124 static int __init replicator_init(void)
125 {
126 	return platform_driver_register(&replicator_driver);
127 }
128 module_init(replicator_init);
129 
130 static void __exit replicator_exit(void)
131 {
132 	platform_driver_unregister(&replicator_driver);
133 }
134 module_exit(replicator_exit);
135 
136 MODULE_LICENSE("GPL v2");
137 MODULE_DESCRIPTION("CoreSight Replicator driver");
138