Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-leds
[linux-2.6] / 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 #include <asm/mach-types.h>
32 #include <asm/hardware.h>
33
34 static struct clk *usb_host_clock;
35
36 static void ep93xx_start_hc(struct device *dev)
37 {
38         clk_enable(usb_host_clock);
39 }
40
41 static void ep93xx_stop_hc(struct device *dev)
42 {
43         clk_disable(usb_host_clock);
44 }
45
46 static 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);
87 err2:
88         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
89 err1:
90         usb_put_hcd(hcd);
91
92         return retval;
93 }
94
95 static 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
106 static 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
123 static 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 #ifdef CONFIG_PM
139         .bus_suspend            = ohci_bus_suspend,
140         .bus_resume             = ohci_bus_resume,
141 #endif
142         .start_port_reset       = ohci_start_port_reset,
143 };
144
145 extern int usb_disabled(void);
146
147 static int ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
148 {
149         int ret;
150
151         ret = -ENODEV;
152         if (!usb_disabled())
153                 ret = usb_hcd_ep93xx_probe(&ohci_ep93xx_hc_driver, pdev);
154
155         return ret;
156 }
157
158 static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
159 {
160         struct usb_hcd *hcd = platform_get_drvdata(pdev);
161
162         usb_hcd_ep93xx_remove(hcd, pdev);
163
164         return 0;
165 }
166
167 #ifdef CONFIG_PM
168 static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
169 {
170         struct usb_hcd *hcd = platform_get_drvdata(pdev);
171         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
172
173         if (time_before(jiffies, ohci->next_statechange))
174                 msleep(5);
175         ohci->next_statechange = jiffies;
176
177         ep93xx_stop_hc(&pdev->dev);
178         hcd->state = HC_STATE_SUSPENDED;
179
180         return 0;
181 }
182
183 static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
184 {
185         struct usb_hcd *hcd = platform_get_drvdata(pdev);
186         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
187         int status;
188
189         if (time_before(jiffies, ohci->next_statechange))
190                 msleep(5);
191         ohci->next_statechange = jiffies;
192
193         ep93xx_start_hc(&pdev->dev);
194
195         ohci_finish_controller_resume(hcd);
196         return 0;
197 }
198 #endif
199
200
201 static struct platform_driver ohci_hcd_ep93xx_driver = {
202         .probe          = ohci_hcd_ep93xx_drv_probe,
203         .remove         = ohci_hcd_ep93xx_drv_remove,
204         .shutdown       = usb_hcd_platform_shutdown,
205 #ifdef CONFIG_PM
206         .suspend        = ohci_hcd_ep93xx_drv_suspend,
207         .resume         = ohci_hcd_ep93xx_drv_resume,
208 #endif
209         .driver         = {
210                 .name   = "ep93xx-ohci",
211                 .owner  = THIS_MODULE,
212         },
213 };
214
215 MODULE_ALIAS("platform:ep93xx-ohci");