1/*
2 * OHCI HCD (Host Controller Driver) for USB.
3 *
4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
6 * (C) Copyright 2002 Hewlett-Packard Company
7 *
8 * Bus Glue for ep93xx.
9 *
10 * Written by Christopher Hoover <ch@hpl.hp.com>
11 * Based on fragments of previous driver by Russell King et al.
12 *
13 * Modified for LH7A404 from ohci-sa1111.c
14 *  by Durgesh Pattamatta <pattamattad@sharpsec.com>
15 *
16 * Modified for pxa27x from ohci-lh7a404.c
17 *  by Nick Bane <nick@cecomputing.co.uk> 26-8-2004
18 *
19 * Modified for ep93xx from ohci-pxa27x.c
20 *  by Lennert Buytenhek <buytenh@wantstofly.org> 28-2-2006
21 *  Based on an earlier driver by Ray Lehtiniemi
22 *
23 * This file is licenced under the GPL.
24 */
25
26#include <linux/clk.h>
27#include <linux/device.h>
28#include <linux/signal.h>
29#include <linux/platform_device.h>
30
31#include <asm/mach-types.h>
32#include <asm/hardware.h>
33
34static struct clk *usb_host_clock;
35
36static void ep93xx_start_hc(struct device *dev)
37{
38	clk_enable(usb_host_clock);
39}
40
41static void ep93xx_stop_hc(struct device *dev)
42{
43	clk_disable(usb_host_clock);
44}
45
46static int usb_hcd_ep93xx_probe(const struct hc_driver *driver,
47			 struct platform_device *pdev)
48{
49	int retval;
50	struct usb_hcd *hcd;
51
52	if (pdev->resource[1].flags != IORESOURCE_IRQ) {
53		pr_debug("resource[1] is not IORESOURCE_IRQ");
54		return -ENOMEM;
55	}
56
57	hcd = usb_create_hcd(driver, &pdev->dev, "ep93xx");
58	if (hcd == NULL)
59		return -ENOMEM;
60
61	hcd->rsrc_start = pdev->resource[0].start;
62	hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
63	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
64		usb_put_hcd(hcd);
65		retval = -EBUSY;
66		goto err1;
67	}
68
69	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
70	if (hcd->regs == NULL) {
71		pr_debug("ioremap failed");
72		retval = -ENOMEM;
73		goto err2;
74	}
75
76	usb_host_clock = clk_get(&pdev->dev, "usb_host");
77	ep93xx_start_hc(&pdev->dev);
78
79	ohci_hcd_init(hcd_to_ohci(hcd));
80
81	retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED);
82	if (retval == 0)
83		return retval;
84
85	ep93xx_stop_hc(&pdev->dev);
86	iounmap(hcd->regs);
87err2:
88	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
89err1:
90	usb_put_hcd(hcd);
91
92	return retval;
93}
94
95static void usb_hcd_ep93xx_remove(struct usb_hcd *hcd,
96			struct platform_device *pdev)
97{
98	usb_remove_hcd(hcd);
99	ep93xx_stop_hc(&pdev->dev);
100	clk_put(usb_host_clock);
101	iounmap(hcd->regs);
102	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
103	usb_put_hcd(hcd);
104}
105
106static int __devinit ohci_ep93xx_start(struct usb_hcd *hcd)
107{
108	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
109	int ret;
110
111	if ((ret = ohci_init(ohci)) < 0)
112		return ret;
113
114	if ((ret = ohci_run(ohci)) < 0) {
115		err("can't start %s", hcd->self.bus_name);
116		ohci_stop(hcd);
117		return ret;
118	}
119
120	return 0;
121}
122
123static struct hc_driver ohci_ep93xx_hc_driver = {
124	.description		= hcd_name,
125	.product_desc		= "EP93xx OHCI",
126	.hcd_priv_size		= sizeof(struct ohci_hcd),
127	.irq			= ohci_irq,
128	.flags			= HCD_USB11 | HCD_MEMORY,
129	.start			= ohci_ep93xx_start,
130	.stop			= ohci_stop,
131	.shutdown		= ohci_shutdown,
132	.urb_enqueue		= ohci_urb_enqueue,
133	.urb_dequeue		= ohci_urb_dequeue,
134	.endpoint_disable	= ohci_endpoint_disable,
135	.get_frame_number	= ohci_get_frame,
136	.hub_status_data	= ohci_hub_status_data,
137	.hub_control		= ohci_hub_control,
138	.hub_irq_enable		= ohci_rhsc_enable,
139#ifdef CONFIG_PM
140	.bus_suspend		= ohci_bus_suspend,
141	.bus_resume		= ohci_bus_resume,
142#endif
143	.start_port_reset	= ohci_start_port_reset,
144};
145
146extern int usb_disabled(void);
147
148static int ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
149{
150	int ret;
151
152	ret = -ENODEV;
153	if (!usb_disabled())
154		ret = usb_hcd_ep93xx_probe(&ohci_ep93xx_hc_driver, pdev);
155
156	return ret;
157}
158
159static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
160{
161	struct usb_hcd *hcd = platform_get_drvdata(pdev);
162
163	usb_hcd_ep93xx_remove(hcd, pdev);
164
165	return 0;
166}
167
168#ifdef CONFIG_PM
169static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
170{
171	struct usb_hcd *hcd = platform_get_drvdata(pdev);
172	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
173
174	if (time_before(jiffies, ohci->next_statechange))
175		msleep(5);
176	ohci->next_statechange = jiffies;
177
178	ep93xx_stop_hc(&pdev->dev);
179	hcd->state = HC_STATE_SUSPENDED;
180	pdev->dev.power.power_state = PMSG_SUSPEND;
181
182	return 0;
183}
184
185static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
186{
187	struct usb_hcd *hcd = platform_get_drvdata(pdev);
188	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
189	int status;
190
191	if (time_before(jiffies, ohci->next_statechange))
192		msleep(5);
193	ohci->next_statechange = jiffies;
194
195	ep93xx_start_hc(&pdev->dev);
196	pdev->dev.power.power_state = PMSG_ON;
197	usb_hcd_resume_root_hub(hcd);
198
199	return 0;
200}
201#endif
202
203
204static struct platform_driver ohci_hcd_ep93xx_driver = {
205	.probe		= ohci_hcd_ep93xx_drv_probe,
206	.remove		= ohci_hcd_ep93xx_drv_remove,
207	.shutdown	= usb_hcd_platform_shutdown,
208#ifdef CONFIG_PM
209	.suspend	= ohci_hcd_ep93xx_drv_suspend,
210	.resume		= ohci_hcd_ep93xx_drv_resume,
211#endif
212	.driver		= {
213		.name	= "ep93xx-ohci",
214	},
215};
216