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 <mach/hardware.h>
32
33 static struct clk *usb_host_clock;
34
ep93xx_start_hc(struct device * dev)35 static void ep93xx_start_hc(struct device *dev)
36 {
37 clk_enable(usb_host_clock);
38 }
39
ep93xx_stop_hc(struct device * dev)40 static void ep93xx_stop_hc(struct device *dev)
41 {
42 clk_disable(usb_host_clock);
43 }
44
usb_hcd_ep93xx_probe(const struct hc_driver * driver,struct platform_device * pdev)45 static int usb_hcd_ep93xx_probe(const struct hc_driver *driver,
46 struct platform_device *pdev)
47 {
48 int retval;
49 struct usb_hcd *hcd;
50
51 if (pdev->resource[1].flags != IORESOURCE_IRQ) {
52 pr_debug("resource[1] is not IORESOURCE_IRQ");
53 return -ENOMEM;
54 }
55
56 hcd = usb_create_hcd(driver, &pdev->dev, "ep93xx");
57 if (hcd == NULL)
58 return -ENOMEM;
59
60 hcd->rsrc_start = pdev->resource[0].start;
61 hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
62 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
63 usb_put_hcd(hcd);
64 retval = -EBUSY;
65 goto err1;
66 }
67
68 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
69 if (hcd->regs == NULL) {
70 pr_debug("ioremap failed");
71 retval = -ENOMEM;
72 goto err2;
73 }
74
75 usb_host_clock = clk_get(&pdev->dev, "usb_host");
76 ep93xx_start_hc(&pdev->dev);
77
78 ohci_hcd_init(hcd_to_ohci(hcd));
79
80 retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED);
81 if (retval == 0)
82 return retval;
83
84 ep93xx_stop_hc(&pdev->dev);
85 iounmap(hcd->regs);
86 err2:
87 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
88 err1:
89 usb_put_hcd(hcd);
90
91 return retval;
92 }
93
usb_hcd_ep93xx_remove(struct usb_hcd * hcd,struct platform_device * pdev)94 static void usb_hcd_ep93xx_remove(struct usb_hcd *hcd,
95 struct platform_device *pdev)
96 {
97 usb_remove_hcd(hcd);
98 ep93xx_stop_hc(&pdev->dev);
99 clk_put(usb_host_clock);
100 iounmap(hcd->regs);
101 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
102 usb_put_hcd(hcd);
103 }
104
ohci_ep93xx_start(struct usb_hcd * hcd)105 static int __devinit ohci_ep93xx_start(struct usb_hcd *hcd)
106 {
107 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
108 int ret;
109
110 if ((ret = ohci_init(ohci)) < 0)
111 return ret;
112
113 if ((ret = ohci_run(ohci)) < 0) {
114 err("can't start %s", hcd->self.bus_name);
115 ohci_stop(hcd);
116 return ret;
117 }
118
119 return 0;
120 }
121
122 static struct hc_driver ohci_ep93xx_hc_driver = {
123 .description = hcd_name,
124 .product_desc = "EP93xx OHCI",
125 .hcd_priv_size = sizeof(struct ohci_hcd),
126 .irq = ohci_irq,
127 .flags = HCD_USB11 | HCD_MEMORY,
128 .start = ohci_ep93xx_start,
129 .stop = ohci_stop,
130 .shutdown = ohci_shutdown,
131 .urb_enqueue = ohci_urb_enqueue,
132 .urb_dequeue = ohci_urb_dequeue,
133 .endpoint_disable = ohci_endpoint_disable,
134 .get_frame_number = ohci_get_frame,
135 .hub_status_data = ohci_hub_status_data,
136 .hub_control = ohci_hub_control,
137 #ifdef CONFIG_PM
138 .bus_suspend = ohci_bus_suspend,
139 .bus_resume = ohci_bus_resume,
140 #endif
141 .start_port_reset = ohci_start_port_reset,
142 };
143
144 extern int usb_disabled(void);
145
ohci_hcd_ep93xx_drv_probe(struct platform_device * pdev)146 static int ohci_hcd_ep93xx_drv_probe(struct platform_device *pdev)
147 {
148 int ret;
149
150 ret = -ENODEV;
151 if (!usb_disabled())
152 ret = usb_hcd_ep93xx_probe(&ohci_ep93xx_hc_driver, pdev);
153
154 return ret;
155 }
156
ohci_hcd_ep93xx_drv_remove(struct platform_device * pdev)157 static int ohci_hcd_ep93xx_drv_remove(struct platform_device *pdev)
158 {
159 struct usb_hcd *hcd = platform_get_drvdata(pdev);
160
161 usb_hcd_ep93xx_remove(hcd, pdev);
162
163 return 0;
164 }
165
166 #ifdef CONFIG_PM
ohci_hcd_ep93xx_drv_suspend(struct platform_device * pdev,pm_message_t state)167 static int ohci_hcd_ep93xx_drv_suspend(struct platform_device *pdev, pm_message_t state)
168 {
169 struct usb_hcd *hcd = platform_get_drvdata(pdev);
170 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
171
172 if (time_before(jiffies, ohci->next_statechange))
173 msleep(5);
174 ohci->next_statechange = jiffies;
175
176 ep93xx_stop_hc(&pdev->dev);
177 hcd->state = HC_STATE_SUSPENDED;
178
179 return 0;
180 }
181
ohci_hcd_ep93xx_drv_resume(struct platform_device * pdev)182 static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
183 {
184 struct usb_hcd *hcd = platform_get_drvdata(pdev);
185 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
186 int status;
187
188 if (time_before(jiffies, ohci->next_statechange))
189 msleep(5);
190 ohci->next_statechange = jiffies;
191
192 ep93xx_start_hc(&pdev->dev);
193
194 ohci_finish_controller_resume(hcd);
195 return 0;
196 }
197 #endif
198
199
200 static struct platform_driver ohci_hcd_ep93xx_driver = {
201 .probe = ohci_hcd_ep93xx_drv_probe,
202 .remove = ohci_hcd_ep93xx_drv_remove,
203 .shutdown = usb_hcd_platform_shutdown,
204 #ifdef CONFIG_PM
205 .suspend = ohci_hcd_ep93xx_drv_suspend,
206 .resume = ohci_hcd_ep93xx_drv_resume,
207 #endif
208 .driver = {
209 .name = "ep93xx-ohci",
210 .owner = THIS_MODULE,
211 },
212 };
213
214 MODULE_ALIAS("platform:ep93xx-ohci");
215