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b3d99681 RZ |
1 | /* |
2 | * Copyright 2012 Freescale Semiconductor, Inc. | |
3 | * Copyright (C) 2012 Marek Vasut <marex@denx.de> | |
4 | * on behalf of DENX Software Engineering GmbH | |
5 | * | |
6 | * The code contained herein is licensed under the GNU General Public | |
7 | * License. You may obtain a copy of the GNU General Public License | |
8 | * Version 2 or later at the following locations: | |
9 | * | |
10 | * http://www.opensource.org/licenses/gpl-license.html | |
11 | * http://www.gnu.org/copyleft/gpl.html | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/clk.h> | |
18 | #include <linux/usb/otg.h> | |
19 | #include <linux/stmp_device.h> | |
20 | #include <linux/delay.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/io.h> | |
23 | ||
24 | #define DRIVER_NAME "mxs_phy" | |
25 | ||
26 | #define HW_USBPHY_PWD 0x00 | |
27 | #define HW_USBPHY_CTRL 0x30 | |
28 | #define HW_USBPHY_CTRL_SET 0x34 | |
29 | #define HW_USBPHY_CTRL_CLR 0x38 | |
30 | ||
31 | #define BM_USBPHY_CTRL_SFTRST BIT(31) | |
32 | #define BM_USBPHY_CTRL_CLKGATE BIT(30) | |
33 | #define BM_USBPHY_CTRL_ENUTMILEVEL3 BIT(15) | |
34 | #define BM_USBPHY_CTRL_ENUTMILEVEL2 BIT(14) | |
35 | #define BM_USBPHY_CTRL_ENHOSTDISCONDETECT BIT(1) | |
36 | ||
37 | struct mxs_phy { | |
38 | struct usb_phy phy; | |
39 | struct clk *clk; | |
40 | }; | |
41 | ||
42 | #define to_mxs_phy(p) container_of((p), struct mxs_phy, phy) | |
43 | ||
44 | static void mxs_phy_hw_init(struct mxs_phy *mxs_phy) | |
45 | { | |
46 | void __iomem *base = mxs_phy->phy.io_priv; | |
47 | ||
48 | stmp_reset_block(base + HW_USBPHY_CTRL); | |
49 | ||
50 | /* Power up the PHY */ | |
51 | writel_relaxed(0, base + HW_USBPHY_PWD); | |
52 | ||
53 | /* enable FS/LS device */ | |
54 | writel_relaxed(BM_USBPHY_CTRL_ENUTMILEVEL2 | | |
55 | BM_USBPHY_CTRL_ENUTMILEVEL3, | |
56 | base + HW_USBPHY_CTRL_SET); | |
57 | } | |
58 | ||
59 | static int mxs_phy_init(struct usb_phy *phy) | |
60 | { | |
61 | struct mxs_phy *mxs_phy = to_mxs_phy(phy); | |
62 | ||
63 | clk_prepare_enable(mxs_phy->clk); | |
64 | mxs_phy_hw_init(mxs_phy); | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
69 | static void mxs_phy_shutdown(struct usb_phy *phy) | |
70 | { | |
71 | struct mxs_phy *mxs_phy = to_mxs_phy(phy); | |
72 | ||
73 | writel_relaxed(BM_USBPHY_CTRL_CLKGATE, | |
74 | phy->io_priv + HW_USBPHY_CTRL_SET); | |
75 | ||
76 | clk_disable_unprepare(mxs_phy->clk); | |
77 | } | |
78 | ||
ac96511b PC |
79 | static int mxs_phy_on_connect(struct usb_phy *phy, |
80 | enum usb_device_speed speed) | |
b3d99681 | 81 | { |
ac96511b PC |
82 | dev_dbg(phy->dev, "%s speed device has connected\n", |
83 | (speed == USB_SPEED_HIGH) ? "high" : "non-high"); | |
b3d99681 | 84 | |
ac96511b PC |
85 | if (speed == USB_SPEED_HIGH) |
86 | writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, | |
87 | phy->io_priv + HW_USBPHY_CTRL_SET); | |
b3d99681 RZ |
88 | |
89 | return 0; | |
90 | } | |
91 | ||
ac96511b PC |
92 | static int mxs_phy_on_disconnect(struct usb_phy *phy, |
93 | enum usb_device_speed speed) | |
b3d99681 | 94 | { |
ac96511b PC |
95 | dev_dbg(phy->dev, "%s speed device has disconnected\n", |
96 | (speed == USB_SPEED_HIGH) ? "high" : "non-high"); | |
b3d99681 | 97 | |
ac96511b PC |
98 | if (speed == USB_SPEED_HIGH) |
99 | writel_relaxed(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, | |
100 | phy->io_priv + HW_USBPHY_CTRL_CLR); | |
b3d99681 RZ |
101 | |
102 | return 0; | |
103 | } | |
104 | ||
105 | static int mxs_phy_probe(struct platform_device *pdev) | |
106 | { | |
107 | struct resource *res; | |
108 | void __iomem *base; | |
109 | struct clk *clk; | |
110 | struct mxs_phy *mxs_phy; | |
111 | ||
112 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
113 | if (!res) { | |
114 | dev_err(&pdev->dev, "can't get device resources\n"); | |
115 | return -ENOENT; | |
116 | } | |
117 | ||
118 | base = devm_request_and_ioremap(&pdev->dev, res); | |
119 | if (!base) | |
120 | return -EBUSY; | |
121 | ||
122 | clk = devm_clk_get(&pdev->dev, NULL); | |
123 | if (IS_ERR(clk)) { | |
124 | dev_err(&pdev->dev, | |
125 | "can't get the clock, err=%ld", PTR_ERR(clk)); | |
126 | return PTR_ERR(clk); | |
127 | } | |
128 | ||
129 | mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL); | |
130 | if (!mxs_phy) { | |
131 | dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n"); | |
132 | return -ENOMEM; | |
133 | } | |
134 | ||
135 | mxs_phy->phy.io_priv = base; | |
136 | mxs_phy->phy.dev = &pdev->dev; | |
137 | mxs_phy->phy.label = DRIVER_NAME; | |
138 | mxs_phy->phy.init = mxs_phy_init; | |
139 | mxs_phy->phy.shutdown = mxs_phy_shutdown; | |
140 | mxs_phy->phy.notify_connect = mxs_phy_on_connect; | |
141 | mxs_phy->phy.notify_disconnect = mxs_phy_on_disconnect; | |
142 | ||
143 | ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy->phy.notifier); | |
144 | ||
145 | mxs_phy->clk = clk; | |
146 | ||
147 | platform_set_drvdata(pdev, &mxs_phy->phy); | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | static int __devexit mxs_phy_remove(struct platform_device *pdev) | |
153 | { | |
154 | platform_set_drvdata(pdev, NULL); | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
159 | static const struct of_device_id mxs_phy_dt_ids[] = { | |
160 | { .compatible = "fsl,imx23-usbphy", }, | |
161 | { /* sentinel */ } | |
162 | }; | |
163 | MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids); | |
164 | ||
165 | static struct platform_driver mxs_phy_driver = { | |
166 | .probe = mxs_phy_probe, | |
167 | .remove = __devexit_p(mxs_phy_remove), | |
168 | .driver = { | |
169 | .name = DRIVER_NAME, | |
170 | .owner = THIS_MODULE, | |
171 | .of_match_table = mxs_phy_dt_ids, | |
172 | }, | |
173 | }; | |
174 | ||
175 | static int __init mxs_phy_module_init(void) | |
176 | { | |
177 | return platform_driver_register(&mxs_phy_driver); | |
178 | } | |
179 | postcore_initcall(mxs_phy_module_init); | |
180 | ||
181 | static void __exit mxs_phy_module_exit(void) | |
182 | { | |
183 | platform_driver_unregister(&mxs_phy_driver); | |
184 | } | |
185 | module_exit(mxs_phy_module_exit); | |
186 | ||
187 | MODULE_ALIAS("platform:mxs-usb-phy"); | |
188 | MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); | |
189 | MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>"); | |
190 | MODULE_DESCRIPTION("Freescale MXS USB PHY driver"); | |
191 | MODULE_LICENSE("GPL"); |