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 */
32struct replicator_drvdata {
33	struct device		*dev;
34	struct coresight_device	*csdev;
35};
36
37static 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
46static 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
54static const struct coresight_ops_link replicator_link_ops = {
55	.enable		= replicator_enable,
56	.disable	= replicator_disable,
57};
58
59static const struct coresight_ops replicator_cs_ops = {
60	.link_ops	= &replicator_link_ops,
61};
62
63static 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
102static 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
110static const struct of_device_id replicator_match[] = {
111	{.compatible = "arm,coresight-replicator"},
112	{}
113};
114
115static 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
124static int __init replicator_init(void)
125{
126	return platform_driver_register(&replicator_driver);
127}
128module_init(replicator_init);
129
130static void __exit replicator_exit(void)
131{
132	platform_driver_unregister(&replicator_driver);
133}
134module_exit(replicator_exit);
135
136MODULE_LICENSE("GPL v2");
137MODULE_DESCRIPTION("CoreSight Replicator driver");
138