/* * linux/driver/usb/host/ehci-w90x900.c * * Copyright (c) 2008 Nuvoton technology corporation. * * Wan ZongShun <mcuos.com@gmail.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation;version 2 of the License. * */ #include <linux/dma-mapping.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/usb.h> #include <linux/usb/hcd.h> #include "ehci.h" /* enable phy0 and phy1 for w90p910 */ #define ENPHY (0x01<<8) #define PHY0_CTR (0xA4) #define PHY1_CTR (0xA8) #define DRIVER_DESC "EHCI w90x900 driver" static const char hcd_name[] = "ehci-w90x900 "; static struct hc_driver __read_mostly ehci_w90x900_hc_driver; static int usb_w90x900_probe(const struct hc_driver *driver, struct platform_device *pdev) { struct usb_hcd *hcd; struct ehci_hcd *ehci; struct resource *res; int retval = 0, irq; unsigned long val; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { retval = -ENXIO; goto err1; } hcd = usb_create_hcd(driver, &pdev->dev, "w90x900 EHCI"); if (!hcd) { retval = -ENOMEM; goto err1; } hcd->rsrc_start = res->start; hcd->rsrc_len = resource_size(res); if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { retval = -EBUSY; goto err2; } hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); if (hcd->regs == NULL) { retval = -EFAULT; goto err3; } ehci = hcd_to_ehci(hcd); ehci->caps = hcd->regs; ehci->regs = hcd->regs + HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase)); /* enable PHY 0,1,the regs only apply to w90p910 * 0xA4,0xA8 were offsets of PHY0 and PHY1 controller of * w90p910 IC relative to ehci->regs. */ val = __raw_readl(ehci->regs+PHY0_CTR); val |= ENPHY; __raw_writel(val, ehci->regs+PHY0_CTR); val = __raw_readl(ehci->regs+PHY1_CTR); val |= ENPHY; __raw_writel(val, ehci->regs+PHY1_CTR); irq = platform_get_irq(pdev, 0); if (irq < 0) goto err4; retval = usb_add_hcd(hcd, irq, IRQF_SHARED); if (retval != 0) goto err4; return retval; err4: iounmap(hcd->regs); err3: release_mem_region(hcd->rsrc_start, hcd->rsrc_len); err2: usb_put_hcd(hcd); err1: return retval; } static void usb_w90x900_remove(struct usb_hcd *hcd, struct platform_device *pdev) { usb_remove_hcd(hcd); iounmap(hcd->regs); release_mem_region(hcd->rsrc_start, hcd->rsrc_len); usb_put_hcd(hcd); } static int ehci_w90x900_probe(struct platform_device *pdev) { if (usb_disabled()) return -ENODEV; return usb_w90x900_probe(&ehci_w90x900_hc_driver, pdev); } static int ehci_w90x900_remove(struct platform_device *pdev) { struct usb_hcd *hcd = platform_get_drvdata(pdev); usb_w90x900_remove(hcd, pdev); return 0; } static struct platform_driver ehci_hcd_w90x900_driver = { .probe = ehci_w90x900_probe, .remove = ehci_w90x900_remove, .driver = { .name = "w90x900-ehci", .owner = THIS_MODULE, }, }; static int __init ehci_w90X900_init(void) { if (usb_disabled()) return -ENODEV; pr_info("%s: " DRIVER_DESC "\n", hcd_name); ehci_init_driver(&ehci_w90x900_hc_driver, NULL); return platform_driver_register(&ehci_hcd_w90x900_driver); } module_init(ehci_w90X900_init); static void __exit ehci_w90X900_cleanup(void) { platform_driver_unregister(&ehci_hcd_w90x900_driver); } module_exit(ehci_w90X900_cleanup); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>"); MODULE_ALIAS("platform:w90p910-ehci"); MODULE_LICENSE("GPL v2");