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d142d6be RZ |
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; | |
26 | spinlock_t lock; | |
27 | struct clk *clk; | |
28 | struct usbmisc_usb_device usbdev[USB_DEV_MAX]; | |
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, | |
7690417d | 139 | .remove = usbmisc_imx6q_remove, |
d142d6be RZ |
140 | .driver = { |
141 | .name = "usbmisc_imx6q", | |
142 | .owner = THIS_MODULE, | |
143 | .of_match_table = usbmisc_imx6q_dt_ids, | |
144 | }, | |
145 | }; | |
146 | ||
147 | int __init usbmisc_imx6q_drv_init(void) | |
148 | { | |
149 | return platform_driver_register(&usbmisc_imx6q_driver); | |
150 | } | |
151 | subsys_initcall(usbmisc_imx6q_drv_init); | |
152 | ||
153 | void __exit usbmisc_imx6q_drv_exit(void) | |
154 | { | |
155 | platform_driver_unregister(&usbmisc_imx6q_driver); | |
156 | } | |
157 | module_exit(usbmisc_imx6q_drv_exit); | |
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 <richard.zhao@freescale.com>"); |