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Linux/drivers/usb/phy/phy-mxs-usb.c

  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 int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
 45 {
 46         int ret;
 47         void __iomem *base = mxs_phy->phy.io_priv;
 48 
 49         ret = stmp_reset_block(base + HW_USBPHY_CTRL);
 50         if (ret)
 51                 return ret;
 52 
 53         /* Power up the PHY */
 54         writel(0, base + HW_USBPHY_PWD);
 55 
 56         /* enable FS/LS device */
 57         writel(BM_USBPHY_CTRL_ENUTMILEVEL2 |
 58                BM_USBPHY_CTRL_ENUTMILEVEL3,
 59                base + HW_USBPHY_CTRL_SET);
 60 
 61         return 0;
 62 }
 63 
 64 static int mxs_phy_init(struct usb_phy *phy)
 65 {
 66         int ret;
 67         struct mxs_phy *mxs_phy = to_mxs_phy(phy);
 68 
 69         ret = clk_prepare_enable(mxs_phy->clk);
 70         if (ret)
 71                 return ret;
 72 
 73         return mxs_phy_hw_init(mxs_phy);
 74 }
 75 
 76 static void mxs_phy_shutdown(struct usb_phy *phy)
 77 {
 78         struct mxs_phy *mxs_phy = to_mxs_phy(phy);
 79 
 80         writel(BM_USBPHY_CTRL_CLKGATE,
 81                phy->io_priv + HW_USBPHY_CTRL_SET);
 82 
 83         clk_disable_unprepare(mxs_phy->clk);
 84 }
 85 
 86 static int mxs_phy_suspend(struct usb_phy *x, int suspend)
 87 {
 88         int ret;
 89         struct mxs_phy *mxs_phy = to_mxs_phy(x);
 90 
 91         if (suspend) {
 92                 writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
 93                 writel(BM_USBPHY_CTRL_CLKGATE,
 94                        x->io_priv + HW_USBPHY_CTRL_SET);
 95                 clk_disable_unprepare(mxs_phy->clk);
 96         } else {
 97                 ret = clk_prepare_enable(mxs_phy->clk);
 98                 if (ret)
 99                         return ret;
100                 writel(BM_USBPHY_CTRL_CLKGATE,
101                        x->io_priv + HW_USBPHY_CTRL_CLR);
102                 writel(0, x->io_priv + HW_USBPHY_PWD);
103         }
104 
105         return 0;
106 }
107 
108 static int mxs_phy_on_connect(struct usb_phy *phy,
109                 enum usb_device_speed speed)
110 {
111         dev_dbg(phy->dev, "%s speed device has connected\n",
112                 (speed == USB_SPEED_HIGH) ? "high" : "non-high");
113 
114         if (speed == USB_SPEED_HIGH)
115                 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
116                        phy->io_priv + HW_USBPHY_CTRL_SET);
117 
118         return 0;
119 }
120 
121 static int mxs_phy_on_disconnect(struct usb_phy *phy,
122                 enum usb_device_speed speed)
123 {
124         dev_dbg(phy->dev, "%s speed device has disconnected\n",
125                 (speed == USB_SPEED_HIGH) ? "high" : "non-high");
126 
127         if (speed == USB_SPEED_HIGH)
128                 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
129                        phy->io_priv + HW_USBPHY_CTRL_CLR);
130 
131         return 0;
132 }
133 
134 static int mxs_phy_probe(struct platform_device *pdev)
135 {
136         struct resource *res;
137         void __iomem *base;
138         struct clk *clk;
139         struct mxs_phy *mxs_phy;
140         int ret;
141 
142         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
143         base = devm_ioremap_resource(&pdev->dev, res);
144         if (IS_ERR(base))
145                 return PTR_ERR(base);
146 
147         clk = devm_clk_get(&pdev->dev, NULL);
148         if (IS_ERR(clk)) {
149                 dev_err(&pdev->dev,
150                         "can't get the clock, err=%ld", PTR_ERR(clk));
151                 return PTR_ERR(clk);
152         }
153 
154         mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL);
155         if (!mxs_phy) {
156                 dev_err(&pdev->dev, "Failed to allocate USB PHY structure!\n");
157                 return -ENOMEM;
158         }
159 
160         mxs_phy->phy.io_priv            = base;
161         mxs_phy->phy.dev                = &pdev->dev;
162         mxs_phy->phy.label              = DRIVER_NAME;
163         mxs_phy->phy.init               = mxs_phy_init;
164         mxs_phy->phy.shutdown           = mxs_phy_shutdown;
165         mxs_phy->phy.set_suspend        = mxs_phy_suspend;
166         mxs_phy->phy.notify_connect     = mxs_phy_on_connect;
167         mxs_phy->phy.notify_disconnect  = mxs_phy_on_disconnect;
168         mxs_phy->phy.type               = USB_PHY_TYPE_USB2;
169 
170         mxs_phy->clk = clk;
171 
172         platform_set_drvdata(pdev, mxs_phy);
173 
174         ret = usb_add_phy_dev(&mxs_phy->phy);
175         if (ret)
176                 return ret;
177 
178         return 0;
179 }
180 
181 static int mxs_phy_remove(struct platform_device *pdev)
182 {
183         struct mxs_phy *mxs_phy = platform_get_drvdata(pdev);
184 
185         usb_remove_phy(&mxs_phy->phy);
186 
187         return 0;
188 }
189 
190 static const struct of_device_id mxs_phy_dt_ids[] = {
191         { .compatible = "fsl,imx23-usbphy", },
192         { /* sentinel */ }
193 };
194 MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);
195 
196 static struct platform_driver mxs_phy_driver = {
197         .probe = mxs_phy_probe,
198         .remove = mxs_phy_remove,
199         .driver = {
200                 .name = DRIVER_NAME,
201                 .owner  = THIS_MODULE,
202                 .of_match_table = mxs_phy_dt_ids,
203          },
204 };
205 
206 static int __init mxs_phy_module_init(void)
207 {
208         return platform_driver_register(&mxs_phy_driver);
209 }
210 postcore_initcall(mxs_phy_module_init);
211 
212 static void __exit mxs_phy_module_exit(void)
213 {
214         platform_driver_unregister(&mxs_phy_driver);
215 }
216 module_exit(mxs_phy_module_exit);
217 
218 MODULE_ALIAS("platform:mxs-usb-phy");
219 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
220 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
221 MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
222 MODULE_LICENSE("GPL");
223 

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