blob: 545844b7e7962f809f33812d9167f039b5fbc8d1 [file] [log] [blame]
Richard Zhaob3d99682012-07-07 22:56:47 +08001/*
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
37struct 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
Fabio Estevam51e563e2013-07-03 16:34:13 -030044static int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
Richard Zhaob3d99682012-07-07 22:56:47 +080045{
Fabio Estevam51e563e2013-07-03 16:34:13 -030046 int ret;
Richard Zhaob3d99682012-07-07 22:56:47 +080047 void __iomem *base = mxs_phy->phy.io_priv;
48
Fabio Estevam51e563e2013-07-03 16:34:13 -030049 ret = stmp_reset_block(base + HW_USBPHY_CTRL);
50 if (ret)
51 return ret;
Richard Zhaob3d99682012-07-07 22:56:47 +080052
53 /* Power up the PHY */
Marc Kleine-Buddeb5a726b2013-02-28 11:52:30 +010054 writel(0, base + HW_USBPHY_PWD);
Richard Zhaob3d99682012-07-07 22:56:47 +080055
56 /* enable FS/LS device */
Marc Kleine-Buddeb5a726b2013-02-28 11:52:30 +010057 writel(BM_USBPHY_CTRL_ENUTMILEVEL2 |
58 BM_USBPHY_CTRL_ENUTMILEVEL3,
59 base + HW_USBPHY_CTRL_SET);
Fabio Estevam51e563e2013-07-03 16:34:13 -030060
61 return 0;
Richard Zhaob3d99682012-07-07 22:56:47 +080062}
63
64static 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);
Fabio Estevam51e563e2013-07-03 16:34:13 -030069 return mxs_phy_hw_init(mxs_phy);
Richard Zhaob3d99682012-07-07 22:56:47 +080070}
71
72static void mxs_phy_shutdown(struct usb_phy *phy)
73{
74 struct mxs_phy *mxs_phy = to_mxs_phy(phy);
75
Marc Kleine-Buddeb5a726b2013-02-28 11:52:30 +010076 writel(BM_USBPHY_CTRL_CLKGATE,
77 phy->io_priv + HW_USBPHY_CTRL_SET);
Richard Zhaob3d99682012-07-07 22:56:47 +080078
79 clk_disable_unprepare(mxs_phy->clk);
80}
81
Peter Chen04a62212013-01-10 16:35:53 +080082static 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) {
Marc Kleine-Buddeb5a726b2013-02-28 11:52:30 +010087 writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
88 writel(BM_USBPHY_CTRL_CLKGATE,
89 x->io_priv + HW_USBPHY_CTRL_SET);
Peter Chen04a62212013-01-10 16:35:53 +080090 clk_disable_unprepare(mxs_phy->clk);
91 } else {
92 clk_prepare_enable(mxs_phy->clk);
Marc Kleine-Buddeb5a726b2013-02-28 11:52:30 +010093 writel(BM_USBPHY_CTRL_CLKGATE,
94 x->io_priv + HW_USBPHY_CTRL_CLR);
95 writel(0, x->io_priv + HW_USBPHY_PWD);
Peter Chen04a62212013-01-10 16:35:53 +080096 }
97
98 return 0;
99}
100
Peter Chenac965112012-11-09 09:44:44 +0800101static int mxs_phy_on_connect(struct usb_phy *phy,
102 enum usb_device_speed speed)
Richard Zhaob3d99682012-07-07 22:56:47 +0800103{
Peter Chenac965112012-11-09 09:44:44 +0800104 dev_dbg(phy->dev, "%s speed device has connected\n",
105 (speed == USB_SPEED_HIGH) ? "high" : "non-high");
Richard Zhaob3d99682012-07-07 22:56:47 +0800106
Peter Chenac965112012-11-09 09:44:44 +0800107 if (speed == USB_SPEED_HIGH)
Marc Kleine-Buddeb5a726b2013-02-28 11:52:30 +0100108 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
109 phy->io_priv + HW_USBPHY_CTRL_SET);
Richard Zhaob3d99682012-07-07 22:56:47 +0800110
111 return 0;
112}
113
Peter Chenac965112012-11-09 09:44:44 +0800114static int mxs_phy_on_disconnect(struct usb_phy *phy,
115 enum usb_device_speed speed)
Richard Zhaob3d99682012-07-07 22:56:47 +0800116{
Peter Chenac965112012-11-09 09:44:44 +0800117 dev_dbg(phy->dev, "%s speed device has disconnected\n",
118 (speed == USB_SPEED_HIGH) ? "high" : "non-high");
Richard Zhaob3d99682012-07-07 22:56:47 +0800119
Peter Chenac965112012-11-09 09:44:44 +0800120 if (speed == USB_SPEED_HIGH)
Marc Kleine-Buddeb5a726b2013-02-28 11:52:30 +0100121 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
122 phy->io_priv + HW_USBPHY_CTRL_CLR);
Richard Zhaob3d99682012-07-07 22:56:47 +0800123
124 return 0;
125}
126
127static 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;
Sascha Hauer25df6392013-02-27 15:16:30 +0100133 int ret;
Richard Zhaob3d99682012-07-07 22:56:47 +0800134
135 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
Thierry Reding148e1132013-01-21 11:09:22 +0100136 base = devm_ioremap_resource(&pdev->dev, res);
137 if (IS_ERR(base))
138 return PTR_ERR(base);
Richard Zhaob3d99682012-07-07 22:56:47 +0800139
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;
Peter Chen04a62212013-01-10 16:35:53 +0800158 mxs_phy->phy.set_suspend = mxs_phy_suspend;
Richard Zhaob3d99682012-07-07 22:56:47 +0800159 mxs_phy->phy.notify_connect = mxs_phy_on_connect;
160 mxs_phy->phy.notify_disconnect = mxs_phy_on_disconnect;
Michael Grzeschik4e0aa632013-05-15 15:03:14 +0200161 mxs_phy->phy.type = USB_PHY_TYPE_USB2;
Richard Zhaob3d99682012-07-07 22:56:47 +0800162
163 ATOMIC_INIT_NOTIFIER_HEAD(&mxs_phy->phy.notifier);
164
165 mxs_phy->clk = clk;
166
Jisheng Zhang97a27f72013-11-07 10:55:49 +0800167 platform_set_drvdata(pdev, mxs_phy);
Richard Zhaob3d99682012-07-07 22:56:47 +0800168
Sascha Hauer25df6392013-02-27 15:16:30 +0100169 ret = usb_add_phy_dev(&mxs_phy->phy);
170 if (ret)
171 return ret;
172
Richard Zhaob3d99682012-07-07 22:56:47 +0800173 return 0;
174}
175
Bill Pembertonfb4e98a2012-11-19 13:26:20 -0500176static int mxs_phy_remove(struct platform_device *pdev)
Richard Zhaob3d99682012-07-07 22:56:47 +0800177{
Sascha Hauer25df6392013-02-27 15:16:30 +0100178 struct mxs_phy *mxs_phy = platform_get_drvdata(pdev);
179
180 usb_remove_phy(&mxs_phy->phy);
181
Richard Zhaob3d99682012-07-07 22:56:47 +0800182 return 0;
183}
184
185static const struct of_device_id mxs_phy_dt_ids[] = {
186 { .compatible = "fsl,imx23-usbphy", },
187 { /* sentinel */ }
188};
189MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);
190
191static struct platform_driver mxs_phy_driver = {
192 .probe = mxs_phy_probe,
Bill Pemberton76904172012-11-19 13:21:08 -0500193 .remove = mxs_phy_remove,
Richard Zhaob3d99682012-07-07 22:56:47 +0800194 .driver = {
195 .name = DRIVER_NAME,
196 .owner = THIS_MODULE,
197 .of_match_table = mxs_phy_dt_ids,
198 },
199};
200
201static int __init mxs_phy_module_init(void)
202{
203 return platform_driver_register(&mxs_phy_driver);
204}
205postcore_initcall(mxs_phy_module_init);
206
207static void __exit mxs_phy_module_exit(void)
208{
209 platform_driver_unregister(&mxs_phy_driver);
210}
211module_exit(mxs_phy_module_exit);
212
213MODULE_ALIAS("platform:mxs-usb-phy");
214MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
215MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
216MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
217MODULE_LICENSE("GPL");