131 lines
2.8 KiB
C
131 lines
2.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/driver/usb/host/ehci-w90x900.c
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*
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* Copyright (c) 2008 Nuvoton technology corporation.
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*
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* Wan ZongShun <mcuos.com@gmail.com>
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*/
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include "ehci.h"
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/* enable phy0 and phy1 for w90p910 */
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#define ENPHY (0x01<<8)
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#define PHY0_CTR (0xA4)
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#define PHY1_CTR (0xA8)
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#define DRIVER_DESC "EHCI w90x900 driver"
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static const char hcd_name[] = "ehci-w90x900 ";
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static struct hc_driver __read_mostly ehci_w90x900_hc_driver;
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static int ehci_w90x900_probe(struct platform_device *pdev)
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{
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struct usb_hcd *hcd;
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struct ehci_hcd *ehci;
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struct resource *res;
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int retval = 0, irq;
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unsigned long val;
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hcd = usb_create_hcd(&ehci_w90x900_hc_driver,
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&pdev->dev, "w90x900 EHCI");
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if (!hcd) {
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retval = -ENOMEM;
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goto err1;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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hcd->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(hcd->regs)) {
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retval = PTR_ERR(hcd->regs);
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goto err2;
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}
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hcd->rsrc_start = res->start;
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hcd->rsrc_len = resource_size(res);
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ehci = hcd_to_ehci(hcd);
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ehci->caps = hcd->regs;
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ehci->regs = hcd->regs +
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HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
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/* enable PHY 0,1,the regs only apply to w90p910
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* 0xA4,0xA8 were offsets of PHY0 and PHY1 controller of
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* w90p910 IC relative to ehci->regs.
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*/
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val = __raw_readl(ehci->regs+PHY0_CTR);
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val |= ENPHY;
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__raw_writel(val, ehci->regs+PHY0_CTR);
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val = __raw_readl(ehci->regs+PHY1_CTR);
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val |= ENPHY;
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__raw_writel(val, ehci->regs+PHY1_CTR);
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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retval = irq;
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goto err2;
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}
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retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (retval != 0)
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goto err2;
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device_wakeup_enable(hcd->self.controller);
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return retval;
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err2:
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usb_put_hcd(hcd);
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err1:
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return retval;
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}
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static int ehci_w90x900_remove(struct platform_device *pdev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(pdev);
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usb_remove_hcd(hcd);
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usb_put_hcd(hcd);
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return 0;
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}
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static struct platform_driver ehci_hcd_w90x900_driver = {
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.probe = ehci_w90x900_probe,
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.remove = ehci_w90x900_remove,
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.driver = {
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.name = "w90x900-ehci",
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},
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};
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static int __init ehci_w90X900_init(void)
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{
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if (usb_disabled())
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return -ENODEV;
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pr_info("%s: " DRIVER_DESC "\n", hcd_name);
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ehci_init_driver(&ehci_w90x900_hc_driver, NULL);
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return platform_driver_register(&ehci_hcd_w90x900_driver);
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}
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module_init(ehci_w90X900_init);
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static void __exit ehci_w90X900_cleanup(void)
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{
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platform_driver_unregister(&ehci_hcd_w90x900_driver);
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}
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module_exit(ehci_w90X900_cleanup);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
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MODULE_ALIAS("platform:w90p910-ehci");
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MODULE_LICENSE("GPL v2");
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