2 * Copyright 2012 Freescale Semiconductor, Inc.
3 * Copyright (C) 2012 Marek Vasut <marex@denx.de>
4 * on behalf of DENX Software Engineering GmbH
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:
10 * http://www.opensource.org/licenses/gpl-license.html
11 * http://www.gnu.org/copyleft/gpl.html
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>
24 #define DRIVER_NAME "mxs_phy"
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
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)
42 #define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)
44 static void mxs_phy_hw_init(struct mxs_phy
*mxs_phy
)
46 void __iomem
*base
= mxs_phy
->phy
.io_priv
;
48 stmp_reset_block(base
+ HW_USBPHY_CTRL
);
50 /* Power up the PHY */
51 writel(0, base
+ HW_USBPHY_PWD
);
53 /* enable FS/LS device */
54 writel(BM_USBPHY_CTRL_ENUTMILEVEL2
|
55 BM_USBPHY_CTRL_ENUTMILEVEL3
,
56 base
+ HW_USBPHY_CTRL_SET
);
59 static int mxs_phy_init(struct usb_phy
*phy
)
61 struct mxs_phy
*mxs_phy
= to_mxs_phy(phy
);
63 clk_prepare_enable(mxs_phy
->clk
);
64 mxs_phy_hw_init(mxs_phy
);
69 static void mxs_phy_shutdown(struct usb_phy
*phy
)
71 struct mxs_phy
*mxs_phy
= to_mxs_phy(phy
);
73 writel(BM_USBPHY_CTRL_CLKGATE
,
74 phy
->io_priv
+ HW_USBPHY_CTRL_SET
);
76 clk_disable_unprepare(mxs_phy
->clk
);
79 static int mxs_phy_suspend(struct usb_phy
*x
, int suspend
)
81 struct mxs_phy
*mxs_phy
= to_mxs_phy(x
);
84 writel(0xffffffff, x
->io_priv
+ HW_USBPHY_PWD
);
85 writel(BM_USBPHY_CTRL_CLKGATE
,
86 x
->io_priv
+ HW_USBPHY_CTRL_SET
);
87 clk_disable_unprepare(mxs_phy
->clk
);
89 clk_prepare_enable(mxs_phy
->clk
);
90 writel(BM_USBPHY_CTRL_CLKGATE
,
91 x
->io_priv
+ HW_USBPHY_CTRL_CLR
);
92 writel(0, x
->io_priv
+ HW_USBPHY_PWD
);
98 static int mxs_phy_on_connect(struct usb_phy
*phy
,
99 enum usb_device_speed speed
)
101 dev_dbg(phy
->dev
, "%s speed device has connected\n",
102 (speed
== USB_SPEED_HIGH
) ? "high" : "non-high");
104 if (speed
== USB_SPEED_HIGH
)
105 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT
,
106 phy
->io_priv
+ HW_USBPHY_CTRL_SET
);
111 static int mxs_phy_on_disconnect(struct usb_phy
*phy
,
112 enum usb_device_speed speed
)
114 dev_dbg(phy
->dev
, "%s speed device has disconnected\n",
115 (speed
== USB_SPEED_HIGH
) ? "high" : "non-high");
117 if (speed
== USB_SPEED_HIGH
)
118 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT
,
119 phy
->io_priv
+ HW_USBPHY_CTRL_CLR
);
124 static int mxs_phy_probe(struct platform_device
*pdev
)
126 struct resource
*res
;
129 struct mxs_phy
*mxs_phy
;
132 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
134 dev_err(&pdev
->dev
, "can't get device resources\n");
138 base
= devm_ioremap_resource(&pdev
->dev
, res
);
140 return PTR_ERR(base
);
142 clk
= devm_clk_get(&pdev
->dev
, NULL
);
145 "can't get the clock, err=%ld", PTR_ERR(clk
));
149 mxs_phy
= devm_kzalloc(&pdev
->dev
, sizeof(*mxs_phy
), GFP_KERNEL
);
151 dev_err(&pdev
->dev
, "Failed to allocate USB PHY structure!\n");
155 mxs_phy
->phy
.io_priv
= base
;
156 mxs_phy
->phy
.dev
= &pdev
->dev
;
157 mxs_phy
->phy
.label
= DRIVER_NAME
;
158 mxs_phy
->phy
.init
= mxs_phy_init
;
159 mxs_phy
->phy
.shutdown
= mxs_phy_shutdown
;
160 mxs_phy
->phy
.set_suspend
= mxs_phy_suspend
;
161 mxs_phy
->phy
.notify_connect
= mxs_phy_on_connect
;
162 mxs_phy
->phy
.notify_disconnect
= mxs_phy_on_disconnect
;
164 ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy
->phy
.notifier
);
168 platform_set_drvdata(pdev
, &mxs_phy
->phy
);
170 ret
= usb_add_phy_dev(&mxs_phy
->phy
);
177 static int mxs_phy_remove(struct platform_device
*pdev
)
179 struct mxs_phy
*mxs_phy
= platform_get_drvdata(pdev
);
181 usb_remove_phy(&mxs_phy
->phy
);
183 platform_set_drvdata(pdev
, NULL
);
188 static const struct of_device_id mxs_phy_dt_ids
[] = {
189 { .compatible
= "fsl,imx23-usbphy", },
192 MODULE_DEVICE_TABLE(of
, mxs_phy_dt_ids
);
194 static struct platform_driver mxs_phy_driver
= {
195 .probe
= mxs_phy_probe
,
196 .remove
= mxs_phy_remove
,
199 .owner
= THIS_MODULE
,
200 .of_match_table
= mxs_phy_dt_ids
,
204 static int __init
mxs_phy_module_init(void)
206 return platform_driver_register(&mxs_phy_driver
);
208 postcore_initcall(mxs_phy_module_init
);
210 static void __exit
mxs_phy_module_exit(void)
212 platform_driver_unregister(&mxs_phy_driver
);
214 module_exit(mxs_phy_module_exit
);
216 MODULE_ALIAS("platform:mxs-usb-phy");
217 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
218 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
219 MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
220 MODULE_LICENSE("GPL");