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usbmisc_imx6q.c
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1 /*
2  * Copyright 2012 Freescale Semiconductor, Inc.
3  *
4  * The code contained herein is licensed under the GNU General Public
5  * License. You may obtain a copy of the GNU General Public License
6  * Version 2 or later at the following locations:
7  *
8  * http://www.opensource.org/licenses/gpl-license.html
9  * http://www.gnu.org/copyleft/gpl.html
10  */
11 
12 #include <linux/module.h>
13 #include <linux/of_platform.h>
14 #include <linux/clk.h>
15 #include <linux/err.h>
16 #include <linux/io.h>
17 
18 #include "ci13xxx_imx.h"
19 
20 #define USB_DEV_MAX 4
21 
22 #define BM_OVER_CUR_DIS BIT(7)
23 
24 struct imx6q_usbmisc {
25  void __iomem *base;
27  struct clk *clk;
29 };
30 
31 static struct imx6q_usbmisc *usbmisc;
32 
33 static struct usbmisc_usb_device *get_usbdev(struct device *dev)
34 {
35  int i, ret;
36 
37  for (i = 0; i < USB_DEV_MAX; i++) {
38  if (usbmisc->usbdev[i].dev == dev)
39  return &usbmisc->usbdev[i];
40  else if (!usbmisc->usbdev[i].dev)
41  break;
42  }
43 
44  if (i >= USB_DEV_MAX)
45  return ERR_PTR(-EBUSY);
46 
47  ret = usbmisc_get_init_data(dev, &usbmisc->usbdev[i]);
48  if (ret)
49  return ERR_PTR(ret);
50 
51  return &usbmisc->usbdev[i];
52 }
53 
54 static int usbmisc_imx6q_init(struct device *dev)
55 {
56 
57  struct usbmisc_usb_device *usbdev;
58  unsigned long flags;
59  u32 reg;
60 
61  usbdev = get_usbdev(dev);
62  if (IS_ERR(usbdev))
63  return PTR_ERR(usbdev);
64 
65  if (usbdev->disable_oc) {
66  spin_lock_irqsave(&usbmisc->lock, flags);
67  reg = readl(usbmisc->base + usbdev->index * 4);
68  writel(reg | BM_OVER_CUR_DIS,
69  usbmisc->base + usbdev->index * 4);
70  spin_unlock_irqrestore(&usbmisc->lock, flags);
71  }
72 
73  return 0;
74 }
75 
76 static const struct usbmisc_ops imx6q_usbmisc_ops = {
77  .init = usbmisc_imx6q_init,
78 };
79 
80 static const struct of_device_id usbmisc_imx6q_dt_ids[] = {
81  { .compatible = "fsl,imx6q-usbmisc"},
82  { /* sentinel */ }
83 };
84 
85 static int __devinit usbmisc_imx6q_probe(struct platform_device *pdev)
86 {
87  struct resource *res;
88  struct imx6q_usbmisc *data;
89  int ret;
90 
91  if (usbmisc)
92  return -EBUSY;
93 
94  data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
95  if (!data)
96  return -ENOMEM;
97 
98  spin_lock_init(&data->lock);
99 
100  res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
101  data->base = devm_request_and_ioremap(&pdev->dev, res);
102  if (!data->base)
103  return -EADDRNOTAVAIL;
104 
105  data->clk = devm_clk_get(&pdev->dev, NULL);
106  if (IS_ERR(data->clk)) {
107  dev_err(&pdev->dev,
108  "failed to get clock, err=%ld\n", PTR_ERR(data->clk));
109  return PTR_ERR(data->clk);
110  }
111 
112  ret = clk_prepare_enable(data->clk);
113  if (ret) {
114  dev_err(&pdev->dev,
115  "clk_prepare_enable failed, err=%d\n", ret);
116  return ret;
117  }
118 
119  ret = usbmisc_set_ops(&imx6q_usbmisc_ops);
120  if (ret) {
121  clk_disable_unprepare(data->clk);
122  return ret;
123  }
124 
125  usbmisc = data;
126 
127  return 0;
128 }
129 
130 static int __devexit usbmisc_imx6q_remove(struct platform_device *pdev)
131 {
132  usbmisc_unset_ops(&imx6q_usbmisc_ops);
133  clk_disable_unprepare(usbmisc->clk);
134  return 0;
135 }
136 
137 static struct platform_driver usbmisc_imx6q_driver = {
138  .probe = usbmisc_imx6q_probe,
139  .remove = __devexit_p(usbmisc_imx6q_remove),
140  .driver = {
141  .name = "usbmisc_imx6q",
142  .owner = THIS_MODULE,
143  .of_match_table = usbmisc_imx6q_dt_ids,
144  },
145 };
146 
148 {
149  return platform_driver_register(&usbmisc_imx6q_driver);
150 }
152 
154 {
155  platform_driver_unregister(&usbmisc_imx6q_driver);
156 }
158 
159 MODULE_ALIAS("platform:usbmisc-imx6q");
160 MODULE_LICENSE("GPL v2");
161 MODULE_DESCRIPTION("driver for imx6q usb non-core registers");
162 MODULE_AUTHOR("Richard Zhao <[email protected]>");