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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 | ||
51e563e3 | 44 | static int mxs_phy_hw_init(struct mxs_phy *mxs_phy) |
b3d99681 | 45 | { |
51e563e3 | 46 | int ret; |
b3d99681 RZ |
47 | void __iomem *base = mxs_phy->phy.io_priv; |
48 | ||
51e563e3 FE |
49 | ret = stmp_reset_block(base + HW_USBPHY_CTRL); |
50 | if (ret) | |
51 | return ret; | |
b3d99681 RZ |
52 | |
53 | /* Power up the PHY */ | |
b5a726b3 | 54 | writel(0, base + HW_USBPHY_PWD); |
b3d99681 RZ |
55 | |
56 | /* enable FS/LS device */ | |
b5a726b3 MKB |
57 | writel(BM_USBPHY_CTRL_ENUTMILEVEL2 | |
58 | BM_USBPHY_CTRL_ENUTMILEVEL3, | |
59 | base + HW_USBPHY_CTRL_SET); | |
51e563e3 FE |
60 | |
61 | return 0; | |
b3d99681 RZ |
62 | } |
63 | ||
64 | static int mxs_phy_init(struct usb_phy *phy) | |
65 | { | |
66 | struct mxs_phy *mxs_phy = to_mxs_phy(phy); | |
67 | ||
68 | clk_prepare_enable(mxs_phy->clk); | |
51e563e3 | 69 | return mxs_phy_hw_init(mxs_phy); |
b3d99681 RZ |
70 | } |
71 | ||
72 | static void mxs_phy_shutdown(struct usb_phy *phy) | |
73 | { | |
74 | struct mxs_phy *mxs_phy = to_mxs_phy(phy); | |
75 | ||
b5a726b3 MKB |
76 | writel(BM_USBPHY_CTRL_CLKGATE, |
77 | phy->io_priv + HW_USBPHY_CTRL_SET); | |
b3d99681 RZ |
78 | |
79 | clk_disable_unprepare(mxs_phy->clk); | |
80 | } | |
81 | ||
04a6221c PC |
82 | static int mxs_phy_suspend(struct usb_phy *x, int suspend) |
83 | { | |
84 | struct mxs_phy *mxs_phy = to_mxs_phy(x); | |
85 | ||
86 | if (suspend) { | |
b5a726b3 MKB |
87 | writel(0xffffffff, x->io_priv + HW_USBPHY_PWD); |
88 | writel(BM_USBPHY_CTRL_CLKGATE, | |
89 | x->io_priv + HW_USBPHY_CTRL_SET); | |
04a6221c PC |
90 | clk_disable_unprepare(mxs_phy->clk); |
91 | } else { | |
92 | clk_prepare_enable(mxs_phy->clk); | |
b5a726b3 MKB |
93 | writel(BM_USBPHY_CTRL_CLKGATE, |
94 | x->io_priv + HW_USBPHY_CTRL_CLR); | |
95 | writel(0, x->io_priv + HW_USBPHY_PWD); | |
04a6221c PC |
96 | } |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
ac96511b PC |
101 | static int mxs_phy_on_connect(struct usb_phy *phy, |
102 | enum usb_device_speed speed) | |
b3d99681 | 103 | { |
ac96511b PC |
104 | dev_dbg(phy->dev, "%s speed device has connected\n", |
105 | (speed == USB_SPEED_HIGH) ? "high" : "non-high"); | |
b3d99681 | 106 | |
ac96511b | 107 | if (speed == USB_SPEED_HIGH) |
b5a726b3 MKB |
108 | writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, |
109 | phy->io_priv + HW_USBPHY_CTRL_SET); | |
b3d99681 RZ |
110 | |
111 | return 0; | |
112 | } | |
113 | ||
ac96511b PC |
114 | static int mxs_phy_on_disconnect(struct usb_phy *phy, |
115 | enum usb_device_speed speed) | |
b3d99681 | 116 | { |
ac96511b PC |
117 | dev_dbg(phy->dev, "%s speed device has disconnected\n", |
118 | (speed == USB_SPEED_HIGH) ? "high" : "non-high"); | |
b3d99681 | 119 | |
ac96511b | 120 | if (speed == USB_SPEED_HIGH) |
b5a726b3 MKB |
121 | writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, |
122 | phy->io_priv + HW_USBPHY_CTRL_CLR); | |
b3d99681 RZ |
123 | |
124 | return 0; | |
125 | } | |
126 | ||
127 | static int mxs_phy_probe(struct platform_device *pdev) | |
128 | { | |
129 | struct resource *res; | |
130 | void __iomem *base; | |
131 | struct clk *clk; | |
132 | struct mxs_phy *mxs_phy; | |
25df6397 | 133 | int ret; |
b3d99681 RZ |
134 | |
135 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
148e1134 TR |
136 | base = devm_ioremap_resource(&pdev->dev, res); |
137 | if (IS_ERR(base)) | |
138 | return PTR_ERR(base); | |
b3d99681 RZ |
139 | |
140 | clk = devm_clk_get(&pdev->dev, NULL); | |
141 | if (IS_ERR(clk)) { | |
142 | dev_err(&pdev->dev, | |
143 | "can't get the clock, err=%ld", PTR_ERR(clk)); | |
144 | return PTR_ERR(clk); | |
145 | } | |
146 | ||
147 | mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL); | |
148 | if (!mxs_phy) { | |
149 | dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n"); | |
150 | return -ENOMEM; | |
151 | } | |
152 | ||
153 | mxs_phy->phy.io_priv = base; | |
154 | mxs_phy->phy.dev = &pdev->dev; | |
155 | mxs_phy->phy.label = DRIVER_NAME; | |
156 | mxs_phy->phy.init = mxs_phy_init; | |
157 | mxs_phy->phy.shutdown = mxs_phy_shutdown; | |
04a6221c | 158 | mxs_phy->phy.set_suspend = mxs_phy_suspend; |
b3d99681 RZ |
159 | mxs_phy->phy.notify_connect = mxs_phy_on_connect; |
160 | mxs_phy->phy.notify_disconnect = mxs_phy_on_disconnect; | |
4e0aa635 | 161 | mxs_phy->phy.type = USB_PHY_TYPE_USB2; |
b3d99681 RZ |
162 | |
163 | ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy->phy.notifier); | |
164 | ||
165 | mxs_phy->clk = clk; | |
166 | ||
97a27f73 | 167 | platform_set_drvdata(pdev, mxs_phy); |
b3d99681 | 168 | |
25df6397 SH |
169 | ret = usb_add_phy_dev(&mxs_phy->phy); |
170 | if (ret) | |
171 | return ret; | |
172 | ||
b3d99681 RZ |
173 | return 0; |
174 | } | |
175 | ||
fb4e98ab | 176 | static int mxs_phy_remove(struct platform_device *pdev) |
b3d99681 | 177 | { |
25df6397 SH |
178 | struct mxs_phy *mxs_phy = platform_get_drvdata(pdev); |
179 | ||
180 | usb_remove_phy(&mxs_phy->phy); | |
181 | ||
b3d99681 RZ |
182 | return 0; |
183 | } | |
184 | ||
185 | static const struct of_device_id mxs_phy_dt_ids[] = { | |
186 | { .compatible = "fsl,imx23-usbphy", }, | |
187 | { /* sentinel */ } | |
188 | }; | |
189 | MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids); | |
190 | ||
191 | static struct platform_driver mxs_phy_driver = { | |
192 | .probe = mxs_phy_probe, | |
7690417d | 193 | .remove = mxs_phy_remove, |
b3d99681 RZ |
194 | .driver = { |
195 | .name = DRIVER_NAME, | |
196 | .owner = THIS_MODULE, | |
197 | .of_match_table = mxs_phy_dt_ids, | |
198 | }, | |
199 | }; | |
200 | ||
201 | static int __init mxs_phy_module_init(void) | |
202 | { | |
203 | return platform_driver_register(&mxs_phy_driver); | |
204 | } | |
205 | postcore_initcall(mxs_phy_module_init); | |
206 | ||
207 | static void __exit mxs_phy_module_exit(void) | |
208 | { | |
209 | platform_driver_unregister(&mxs_phy_driver); | |
210 | } | |
211 | module_exit(mxs_phy_module_exit); | |
212 | ||
213 | MODULE_ALIAS("platform:mxs-usb-phy"); | |
214 | MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); | |
215 | MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>"); | |
216 | MODULE_DESCRIPTION("Freescale MXS USB PHY driver"); | |
217 | MODULE_LICENSE("GPL"); |