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120 lines
3.0 KiB
120 lines
3.0 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* phy-keystone - USB PHY, talking to dwc3 controller in Keystone. |
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* |
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* Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com |
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* |
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* Author: WingMan Kwok <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/usb/usb_phy_generic.h> |
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#include <linux/io.h> |
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#include <linux/of.h> |
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#include "phy-generic.h" |
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/* USB PHY control register offsets */ |
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#define USB_PHY_CTL_UTMI 0x0000 |
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#define USB_PHY_CTL_PIPE 0x0004 |
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#define USB_PHY_CTL_PARAM_1 0x0008 |
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#define USB_PHY_CTL_PARAM_2 0x000c |
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#define USB_PHY_CTL_CLOCK 0x0010 |
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#define USB_PHY_CTL_PLL 0x0014 |
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#define PHY_REF_SSP_EN BIT(29) |
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struct keystone_usbphy { |
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struct usb_phy_generic usb_phy_gen; |
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void __iomem *phy_ctrl; |
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}; |
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static inline u32 keystone_usbphy_readl(void __iomem *base, u32 offset) |
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{ |
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return readl(base + offset); |
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} |
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static inline void keystone_usbphy_writel(void __iomem *base, |
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u32 offset, u32 value) |
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{ |
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writel(value, base + offset); |
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} |
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static int keystone_usbphy_init(struct usb_phy *phy) |
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{ |
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struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev); |
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u32 val; |
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val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK); |
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keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK, |
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val | PHY_REF_SSP_EN); |
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return 0; |
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} |
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static void keystone_usbphy_shutdown(struct usb_phy *phy) |
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{ |
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struct keystone_usbphy *k_phy = dev_get_drvdata(phy->dev); |
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u32 val; |
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val = keystone_usbphy_readl(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK); |
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keystone_usbphy_writel(k_phy->phy_ctrl, USB_PHY_CTL_CLOCK, |
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val &= ~PHY_REF_SSP_EN); |
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} |
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static int keystone_usbphy_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct keystone_usbphy *k_phy; |
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int ret; |
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k_phy = devm_kzalloc(dev, sizeof(*k_phy), GFP_KERNEL); |
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if (!k_phy) |
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return -ENOMEM; |
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k_phy->phy_ctrl = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(k_phy->phy_ctrl)) |
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return PTR_ERR(k_phy->phy_ctrl); |
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ret = usb_phy_gen_create_phy(dev, &k_phy->usb_phy_gen); |
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if (ret) |
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return ret; |
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k_phy->usb_phy_gen.phy.init = keystone_usbphy_init; |
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k_phy->usb_phy_gen.phy.shutdown = keystone_usbphy_shutdown; |
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platform_set_drvdata(pdev, k_phy); |
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return usb_add_phy_dev(&k_phy->usb_phy_gen.phy); |
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} |
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static int keystone_usbphy_remove(struct platform_device *pdev) |
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{ |
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struct keystone_usbphy *k_phy = platform_get_drvdata(pdev); |
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usb_remove_phy(&k_phy->usb_phy_gen.phy); |
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return 0; |
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} |
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static const struct of_device_id keystone_usbphy_ids[] = { |
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{ .compatible = "ti,keystone-usbphy" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, keystone_usbphy_ids); |
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static struct platform_driver keystone_usbphy_driver = { |
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.probe = keystone_usbphy_probe, |
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.remove = keystone_usbphy_remove, |
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.driver = { |
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.name = "keystone-usbphy", |
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.of_match_table = keystone_usbphy_ids, |
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}, |
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}; |
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module_platform_driver(keystone_usbphy_driver); |
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MODULE_ALIAS("platform:keystone-usbphy"); |
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MODULE_AUTHOR("Texas Instruments Inc."); |
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MODULE_DESCRIPTION("Keystone USB phy driver"); |
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MODULE_LICENSE("GPL v2");
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