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Add Keystone platform USB PHY driver support. Current main purpose of this driver is to enable the PHY reference clock gate on the Keystone SoC. Otherwise it is a nop PHY. [ balbi@ti.com : add COMPILE_TEST as a possible dependency make sure drvdata is initialized before adding PHY ] Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: WingMan Kwok <w-kwok2@ti.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
/*
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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 - http://www.ti.com
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Author: WingMan Kwok <w-kwok2@ti.com>
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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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_gen_xceiv.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_gen_xceiv 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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struct resource *res;
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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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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(dev, "missing usb phy resource\n");
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return -EINVAL;
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}
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k_phy->phy_ctrl = devm_ioremap_resource(dev, res);
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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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USB_PHY_TYPE_USB2, 0, false);
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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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ret = usb_add_phy_dev(&k_phy->usb_phy_gen.phy);
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if (ret)
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return ret;
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return 0;
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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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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(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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