1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2014 Marvell Technology Group Ltd.
4  *
5  * Antoine Tenart <antoine.tenart@free-electrons.com>
6  */
7 
8 #include <linux/clk.h>
9 #include <linux/dma-mapping.h>
10 #include <linux/module.h>
11 #include <linux/of.h>
12 #include <linux/of_platform.h>
13 #include <linux/phy/phy.h>
14 #include <linux/platform_device.h>
15 #include <linux/usb/chipidea.h>
16 #include <linux/usb/hcd.h>
17 #include <linux/usb/ulpi.h>
18 
19 #include "ci.h"
20 
21 struct ci_hdrc_usb2_priv {
22 	struct platform_device	*ci_pdev;
23 	struct clk		*clk;
24 };
25 
26 static const struct ci_hdrc_platform_data ci_default_pdata = {
27 	.capoffset	= DEF_CAPOFFSET,
28 	.flags		= CI_HDRC_DISABLE_STREAMING,
29 };
30 
31 static const struct ci_hdrc_platform_data ci_zynq_pdata = {
32 	.capoffset	= DEF_CAPOFFSET,
33 	.flags          = CI_HDRC_PHY_VBUS_CONTROL,
34 };
35 
36 static const struct ci_hdrc_platform_data ci_zevio_pdata = {
37 	.capoffset	= DEF_CAPOFFSET,
38 	.flags		= CI_HDRC_REGS_SHARED | CI_HDRC_FORCE_FULLSPEED,
39 };
40 
41 static const struct of_device_id ci_hdrc_usb2_of_match[] = {
42 	{ .compatible = "chipidea,usb2" },
43 	{ .compatible = "xlnx,zynq-usb-2.20a", .data = &ci_zynq_pdata },
44 	{ .compatible = "lsi,zevio-usb", .data = &ci_zevio_pdata },
45 	{ }
46 };
47 MODULE_DEVICE_TABLE(of, ci_hdrc_usb2_of_match);
48 
ci_hdrc_usb2_probe(struct platform_device * pdev)49 static int ci_hdrc_usb2_probe(struct platform_device *pdev)
50 {
51 	struct device *dev = &pdev->dev;
52 	struct ci_hdrc_usb2_priv *priv;
53 	struct ci_hdrc_platform_data *ci_pdata = dev_get_platdata(dev);
54 	int ret;
55 	const struct of_device_id *match;
56 
57 	if (!ci_pdata) {
58 		ci_pdata = devm_kmalloc(dev, sizeof(*ci_pdata), GFP_KERNEL);
59 		if (!ci_pdata)
60 			return -ENOMEM;
61 		*ci_pdata = ci_default_pdata;	/* struct copy */
62 	}
63 
64 	match = of_match_device(ci_hdrc_usb2_of_match, &pdev->dev);
65 	if (match && match->data) {
66 		/* struct copy */
67 		*ci_pdata = *(struct ci_hdrc_platform_data *)match->data;
68 	}
69 
70 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
71 	if (!priv)
72 		return -ENOMEM;
73 
74 	priv->clk = devm_clk_get_optional(dev, NULL);
75 	if (IS_ERR(priv->clk))
76 		return PTR_ERR(priv->clk);
77 
78 	ret = clk_prepare_enable(priv->clk);
79 	if (ret) {
80 		dev_err(dev, "failed to enable the clock: %d\n", ret);
81 		return ret;
82 	}
83 
84 	ci_pdata->name = dev_name(dev);
85 
86 	priv->ci_pdev = ci_hdrc_add_device(dev, pdev->resource,
87 					   pdev->num_resources, ci_pdata);
88 	if (IS_ERR(priv->ci_pdev)) {
89 		ret = PTR_ERR(priv->ci_pdev);
90 		if (ret != -EPROBE_DEFER)
91 			dev_err(dev,
92 				"failed to register ci_hdrc platform device: %d\n",
93 				ret);
94 		goto clk_err;
95 	}
96 
97 	platform_set_drvdata(pdev, priv);
98 
99 	pm_runtime_no_callbacks(dev);
100 	pm_runtime_enable(dev);
101 
102 	return 0;
103 
104 clk_err:
105 	clk_disable_unprepare(priv->clk);
106 	return ret;
107 }
108 
ci_hdrc_usb2_remove(struct platform_device * pdev)109 static int ci_hdrc_usb2_remove(struct platform_device *pdev)
110 {
111 	struct ci_hdrc_usb2_priv *priv = platform_get_drvdata(pdev);
112 
113 	pm_runtime_disable(&pdev->dev);
114 	ci_hdrc_remove_device(priv->ci_pdev);
115 	clk_disable_unprepare(priv->clk);
116 
117 	return 0;
118 }
119 
120 static struct platform_driver ci_hdrc_usb2_driver = {
121 	.probe	= ci_hdrc_usb2_probe,
122 	.remove	= ci_hdrc_usb2_remove,
123 	.driver	= {
124 		.name		= "chipidea-usb2",
125 		.of_match_table	= of_match_ptr(ci_hdrc_usb2_of_match),
126 	},
127 };
128 module_platform_driver(ci_hdrc_usb2_driver);
129 
130 MODULE_DESCRIPTION("ChipIdea HDRC USB2 binding for ci13xxx");
131 MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
132 MODULE_LICENSE("GPL");
133