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");
149