USB: ohci-ep93xx.c: remove unused variable
[linux-2.6.git] / drivers / usb / host / ohci-ep93xx.c
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 static struct clk *usb_host_clock;
32
33 static void ep93xx_start_hc(struct device *dev)
34 {
35         clk_enable(usb_host_clock);
36 }
37
38 static void ep93xx_stop_hc(struct device *dev)
39 {
40         clk_disable(usb_host_clock);
41 }
42
43 static int usb_hcd_ep93xx_probe(const struct hc_driver *driver,
44                          struct platform_device *pdev)
45 {
46         int retval;
47         struct usb_hcd *hcd;
48
49         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
50                 dbg("resource[1] is not IORESOURCE_IRQ");
51                 return -ENOMEM;
52         }
53
54         hcd = usb_create_hcd(driver, &pdev->dev, "ep93xx");
55         if (hcd == NULL)
56                 return -ENOMEM;
57
58         hcd->rsrc_start = pdev->resource[0].start;
59         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
60         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
61                 usb_put_hcd(hcd);
62                 retval = -EBUSY;
63                 goto err1;
64         }
65
66         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
67         if (hcd->regs == NULL) {
68                 dbg("ioremap failed");
69                 retval = -ENOMEM;
70                 goto err2;
71         }
72
73         usb_host_clock = clk_get(&pdev->dev, NULL);
74         if (IS_ERR(usb_host_clock)) {
75                 dbg("clk_get failed");
76                 retval = PTR_ERR(usb_host_clock);
77                 goto err3;
78         }
79
80         ep93xx_start_hc(&pdev->dev);
81
82         ohci_hcd_init(hcd_to_ohci(hcd));
83
84         retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED);
85         if (retval == 0)
86                 return retval;
87
88         ep93xx_stop_hc(&pdev->dev);
89 err3:
90         iounmap(hcd->regs);
91 err2:
92         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
93 err1:
94         usb_put_hcd(hcd);
95
96         return retval;
97 }
98
99 static void usb_hcd_ep93xx_remove(struct usb_hcd *hcd,
100                         struct platform_device *pdev)
101 {
102         usb_remove_hcd(hcd);
103         ep93xx_stop_hc(&pdev->dev);
104         clk_put(usb_host_clock);
105         iounmap(hcd->regs);
106         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
107         usb_put_hcd(hcd);
108 }
109
110 static int __devinit ohci_ep93xx_start(struct usb_hcd *hcd)
111 {
112         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
113         int ret;
114
115         if ((ret = ohci_init(ohci)) < 0)
116                 return ret;
117
118         if ((ret = ohci_run(ohci)) < 0) {
119                 err("can't start %s", hcd->self.bus_name);
120                 ohci_stop(hcd);
121                 return ret;
122         }
123
124         return 0;
125 }
126
127 static struct hc_driver ohci_ep93xx_hc_driver = {
128         .description            = hcd_name,
129         .product_desc           = "EP93xx OHCI",
130         .hcd_priv_size          = sizeof(struct ohci_hcd),
131         .irq                    = ohci_irq,
132         .flags                  = HCD_USB11 | HCD_MEMORY,
133         .start                  = ohci_ep93xx_start,
134         .stop                   = ohci_stop,
135         .shutdown               = ohci_shutdown,
136         .urb_enqueue            = ohci_urb_enqueue,
137         .urb_dequeue            = ohci_urb_dequeue,
138         .endpoint_disable       = ohci_endpoint_disable,
139         .get_frame_number       = ohci_get_frame,
140         .hub_status_data        = ohci_hub_status_data,
141         .hub_control            = ohci_hub_control,
142 #ifdef CONFIG_PM
143         .bus_suspend            = ohci_bus_suspend,
144         .bus_resume             = ohci_bus_resume,
145 #endif
146         .start_port_reset       = ohci_start_port_reset,
147 };
148
149 extern int usb_disabled(void);
150
151 static int ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
152 {
153         int ret;
154
155         ret = -ENODEV;
156         if (!usb_disabled())
157                 ret = usb_hcd_ep93xx_probe(&ohci_ep93xx_hc_driver, pdev);
158
159         return ret;
160 }
161
162 static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
163 {
164         struct usb_hcd *hcd = platform_get_drvdata(pdev);
165
166         usb_hcd_ep93xx_remove(hcd, pdev);
167
168         return 0;
169 }
170
171 #ifdef CONFIG_PM
172 static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
173 {
174         struct usb_hcd *hcd = platform_get_drvdata(pdev);
175         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
176
177         if (time_before(jiffies, ohci->next_statechange))
178                 msleep(5);
179         ohci->next_statechange = jiffies;
180
181         ep93xx_stop_hc(&pdev->dev);
182         hcd->state = HC_STATE_SUSPENDED;
183
184         return 0;
185 }
186
187 static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
188 {
189         struct usb_hcd *hcd = platform_get_drvdata(pdev);
190         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
191
192         if (time_before(jiffies, ohci->next_statechange))
193                 msleep(5);
194         ohci->next_statechange = jiffies;
195
196         ep93xx_start_hc(&pdev->dev);
197
198         ohci_finish_controller_resume(hcd);
199         return 0;
200 }
201 #endif
202
203
204 static 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                 .owner  = THIS_MODULE,
215         },
216 };
217
218 MODULE_ALIAS("platform:ep93xx-ohci");