1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * phy-keystone - USB PHY, talking to dwc3 controller in Keystone. 4 * 5 * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com 6 * 7 * Author: WingMan Kwok <w-kwok2@ti.com> 8 */ 9 10 #include <linux/module.h> 11 #include <linux/platform_device.h> 12 #include <linux/usb/usb_phy_generic.h> 13 #include <linux/io.h> 14 #include <linux/of.h> 15 16 #include "phy-generic.h" 17 18 /* USB PHY control register offsets */ 19 #define USB_PHY_CTL_UTMI 0x0000 20 #define USB_PHY_CTL_PIPE 0x0004 21 #define USB_PHY_CTL_PARAM_1 0x0008 22 #define USB_PHY_CTL_PARAM_2 0x000c 23 #define USB_PHY_CTL_CLOCK 0x0010 24 #define USB_PHY_CTL_PLL 0x0014 25 26 #define PHY_REF_SSP_EN BIT(29) 27 28 struct keystone_usbphy { 29 struct usb_phy_generic usb_phy_gen; 30 void __iomem *phy_ctrl; 31 }; 32 33 static inline u32 keystone_usbphy_readl(void __iomem *base, u32 offset) 34 { 35 return readl(base + offset); 36 } 37 38 static inline void keystone_usbphy_writel(void __iomem *base, 39 u32 offset, u32 value) 40 { 41 writel(value, base + offset); 42 } 43 44 static int keystone_usbphy_init(struct usb_phy *phy) 45 { 46 struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev); 47 u32 val; 48 49 val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK); 50 keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK, 51 val | PHY_REF_SSP_EN); 52 return 0; 53 } 54 55 static void keystone_usbphy_shutdown(struct usb_phy *phy) 56 { 57 struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev); 58 u32 val; 59 60 val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK); 61 keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK, 62 val & ~PHY_REF_SSP_EN); 63 } 64 65 static int keystone_usbphy_probe(struct platform_device *pdev) 66 { 67 struct device *dev = &pdev->dev; 68 struct keystone_usbphy *k_phy; 69 int ret; 70 71 k_phy = devm_kzalloc(dev, sizeof(*k_phy), GFP_KERNEL); 72 if (!k_phy) 73 return -ENOMEM; 74 75 k_phy->phy_ctrl = devm_platform_ioremap_resource(pdev, 0); 76 if (IS_ERR(k_phy->phy_ctrl)) 77 return PTR_ERR(k_phy->phy_ctrl); 78 79 ret = usb_phy_gen_create_phy(dev, &k_phy->usb_phy_gen); 80 if (ret) 81 return ret; 82 83 k_phy->usb_phy_gen.phy.init = keystone_usbphy_init; 84 k_phy->usb_phy_gen.phy.shutdown = keystone_usbphy_shutdown; 85 86 platform_set_drvdata(pdev, k_phy); 87 88 return usb_add_phy_dev(&k_phy->usb_phy_gen.phy); 89 } 90 91 static int keystone_usbphy_remove(struct platform_device *pdev) 92 { 93 struct keystone_usbphy *k_phy = platform_get_drvdata(pdev); 94 95 usb_remove_phy(&k_phy->usb_phy_gen.phy); 96 97 return 0; 98 } 99 100 static const struct of_device_id keystone_usbphy_ids[] = { 101 { .compatible = "ti,keystone-usbphy" }, 102 { } 103 }; 104 MODULE_DEVICE_TABLE(of, keystone_usbphy_ids); 105 106 static struct platform_driver keystone_usbphy_driver = { 107 .probe = keystone_usbphy_probe, 108 .remove = keystone_usbphy_remove, 109 .driver = { 110 .name = "keystone-usbphy", 111 .of_match_table = keystone_usbphy_ids, 112 }, 113 }; 114 115 module_platform_driver(keystone_usbphy_driver); 116 117 MODULE_ALIAS("platform:keystone-usbphy"); 118 MODULE_AUTHOR("Texas Instruments Inc."); 119 MODULE_DESCRIPTION("Keystone USB phy driver"); 120 MODULE_LICENSE("GPL v2"); 121