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

  1 /*
  2  * phy-keystone - USB PHY, talking to dwc3 controller in Keystone.
  3  *
  4  * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License as published by
  7  * the Free Software Foundation; either version 2 of the License, or
  8  * (at your option) any later version.
  9  *
 10  * Author: WingMan Kwok <w-kwok2@ti.com>
 11  *
 12  * This program is distributed in the hope that it will be useful,
 13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  *
 17  */
 18 
 19 #include <linux/module.h>
 20 #include <linux/platform_device.h>
 21 #include <linux/usb/usb_phy_generic.h>
 22 #include <linux/io.h>
 23 #include <linux/of.h>
 24 
 25 #include "phy-generic.h"
 26 
 27 /* USB PHY control register offsets */
 28 #define USB_PHY_CTL_UTMI                0x0000
 29 #define USB_PHY_CTL_PIPE                0x0004
 30 #define USB_PHY_CTL_PARAM_1             0x0008
 31 #define USB_PHY_CTL_PARAM_2             0x000c
 32 #define USB_PHY_CTL_CLOCK               0x0010
 33 #define USB_PHY_CTL_PLL                 0x0014
 34 
 35 #define PHY_REF_SSP_EN                  BIT(29)
 36 
 37 struct keystone_usbphy {
 38         struct usb_phy_generic  usb_phy_gen;
 39         void __iomem                    *phy_ctrl;
 40 };
 41 
 42 static inline u32 keystone_usbphy_readl(void __iomem *base, u32 offset)
 43 {
 44         return readl(base + offset);
 45 }
 46 
 47 static inline void keystone_usbphy_writel(void __iomem *base,
 48                                           u32 offset, u32 value)
 49 {
 50         writel(value, base + offset);
 51 }
 52 
 53 static int keystone_usbphy_init(struct usb_phy *phy)
 54 {
 55         struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
 56         u32 val;
 57 
 58         val  = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
 59         keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
 60                                 val | PHY_REF_SSP_EN);
 61         return 0;
 62 }
 63 
 64 static void keystone_usbphy_shutdown(struct usb_phy *phy)
 65 {
 66         struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev);
 67         u32 val;
 68 
 69         val  = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK);
 70         keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK,
 71                                 val &= ~PHY_REF_SSP_EN);
 72 }
 73 
 74 static int keystone_usbphy_probe(struct platform_device *pdev)
 75 {
 76         struct device           *dev = &pdev->dev;
 77         struct keystone_usbphy  *k_phy;
 78         struct resource         *res;
 79         int ret;
 80 
 81         k_phy = devm_kzalloc(dev, sizeof(*k_phy), GFP_KERNEL);
 82         if (!k_phy)
 83                 return -ENOMEM;
 84 
 85         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 86         k_phy->phy_ctrl = devm_ioremap_resource(dev, res);
 87         if (IS_ERR(k_phy->phy_ctrl))
 88                 return PTR_ERR(k_phy->phy_ctrl);
 89 
 90         ret = usb_phy_gen_create_phy(dev, &k_phy->usb_phy_gen, NULL);
 91         if (ret)
 92                 return ret;
 93 
 94         k_phy->usb_phy_gen.phy.init = keystone_usbphy_init;
 95         k_phy->usb_phy_gen.phy.shutdown = keystone_usbphy_shutdown;
 96 
 97         platform_set_drvdata(pdev, k_phy);
 98 
 99         ret = usb_add_phy_dev(&k_phy->usb_phy_gen.phy);
100         if (ret)
101                 return ret;
102 
103         return 0;
104 }
105 
106 static int keystone_usbphy_remove(struct platform_device *pdev)
107 {
108         struct keystone_usbphy *k_phy = platform_get_drvdata(pdev);
109 
110         usb_remove_phy(&k_phy->usb_phy_gen.phy);
111 
112         return 0;
113 }
114 
115 static const struct of_device_id keystone_usbphy_ids[] = {
116         { .compatible = "ti,keystone-usbphy" },
117         { }
118 };
119 MODULE_DEVICE_TABLE(of, keystone_usbphy_ids);
120 
121 static struct platform_driver keystone_usbphy_driver = {
122         .probe          = keystone_usbphy_probe,
123         .remove         = keystone_usbphy_remove,
124         .driver         = {
125                 .name   = "keystone-usbphy",
126                 .owner  = THIS_MODULE,
127                 .of_match_table = keystone_usbphy_ids,
128         },
129 };
130 
131 module_platform_driver(keystone_usbphy_driver);
132 
133 MODULE_ALIAS("platform:keystone-usbphy");
134 MODULE_AUTHOR("Texas Instruments Inc.");
135 MODULE_DESCRIPTION("Keystone USB phy driver");
136 MODULE_LICENSE("GPL v2");
137 

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