1/*
  2 * linux/driver/usb/host/ehci-w90x900.c
  3 *
  4 * Copyright (c) 2008 Nuvoton technology corporation.
  5 *
  6 * Wan ZongShun <mcuos.com@gmail.com>
  7 *
  8 * This program is free software; you can redistribute it and/or modify
  9 * it under the terms of the GNU General Public License as published by
 10 * the Free Software Foundation;version 2 of the License.
 11 *
 12 */
 13
 14#include <linux/dma-mapping.h>
 15#include <linux/io.h>
 16#include <linux/kernel.h>
 17#include <linux/module.h>
 18#include <linux/of.h>
 19#include <linux/platform_device.h>
 20#include <linux/usb.h>
 21#include <linux/usb/hcd.h>
 22
 23#include "ehci.h"
 24
 25/* enable phy0 and phy1 for w90p910 */
 26#define	ENPHY		(0x01<<8)
 27#define PHY0_CTR	(0xA4)
 28#define PHY1_CTR	(0xA8)
 29
 30#define DRIVER_DESC "EHCI w90x900 driver"
 31
 32static const char hcd_name[] = "ehci-w90x900 ";
 33
 34static struct hc_driver __read_mostly ehci_w90x900_hc_driver;
 35
 36static int usb_w90x900_probe(const struct hc_driver *driver,
 37		      struct platform_device *pdev)
 38{
 39	struct usb_hcd *hcd;
 40	struct ehci_hcd *ehci;
 41	struct resource *res;
 42	int retval = 0, irq;
 43	unsigned long val;
 44
 45	hcd = usb_create_hcd(driver, &pdev->dev, "w90x900 EHCI");
 46	if (!hcd) {
 47		retval = -ENOMEM;
 48		goto err1;
 49	}
 50
 51	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 52	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 53	if (IS_ERR(hcd->regs)) {
 54		retval = PTR_ERR(hcd->regs);
 55		goto err2;
 56	}
 57	hcd->rsrc_start = res->start;
 58	hcd->rsrc_len = resource_size(res);
 59
 60	ehci = hcd_to_ehci(hcd);
 61	ehci->caps = hcd->regs;
 62	ehci->regs = hcd->regs +
 63		HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
 64
 65	/* enable PHY 0,1,the regs only apply to w90p910
 66	*  0xA4,0xA8 were offsets of PHY0 and PHY1 controller of
 67	*  w90p910 IC relative to ehci->regs.
 68	*/
 69	val = __raw_readl(ehci->regs+PHY0_CTR);
 70	val |= ENPHY;
 71	__raw_writel(val, ehci->regs+PHY0_CTR);
 72
 73	val = __raw_readl(ehci->regs+PHY1_CTR);
 74	val |= ENPHY;
 75	__raw_writel(val, ehci->regs+PHY1_CTR);
 76
 77	irq = platform_get_irq(pdev, 0);
 78	if (irq < 0) {
 79		retval = irq;
 80		goto err2;
 81	}
 82
 83	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 84	if (retval != 0)
 85		goto err2;
 86
 87	device_wakeup_enable(hcd->self.controller);
 88	return retval;
 89err2:
 90	usb_put_hcd(hcd);
 91err1:
 92	return retval;
 93}
 94
 95static void usb_w90x900_remove(struct usb_hcd *hcd,
 96			struct platform_device *pdev)
 97{
 98	usb_remove_hcd(hcd);
 99	usb_put_hcd(hcd);
100}
101
102static int ehci_w90x900_probe(struct platform_device *pdev)
103{
104	if (usb_disabled())
105		return -ENODEV;
106
107	return usb_w90x900_probe(&ehci_w90x900_hc_driver, pdev);
108}
109
110static int ehci_w90x900_remove(struct platform_device *pdev)
111{
112	struct usb_hcd *hcd = platform_get_drvdata(pdev);
113
114	usb_w90x900_remove(hcd, pdev);
115
116	return 0;
117}
118
119static struct platform_driver ehci_hcd_w90x900_driver = {
120	.probe  = ehci_w90x900_probe,
121	.remove = ehci_w90x900_remove,
122	.driver = {
123		.name = "w90x900-ehci",
124	},
125};
126
127static int __init ehci_w90X900_init(void)
128{
129	if (usb_disabled())
130		return -ENODEV;
131
132	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
133
134	ehci_init_driver(&ehci_w90x900_hc_driver, NULL);
135	return platform_driver_register(&ehci_hcd_w90x900_driver);
136}
137module_init(ehci_w90X900_init);
138
139static void __exit ehci_w90X900_cleanup(void)
140{
141	platform_driver_unregister(&ehci_hcd_w90x900_driver);
142}
143module_exit(ehci_w90X900_cleanup);
144
145MODULE_DESCRIPTION(DRIVER_DESC);
146MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
147MODULE_ALIAS("platform:w90p910-ehci");
148MODULE_LICENSE("GPL v2");