tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 Sharp LH7A404
9 *
10 * Written by Christopher Hoover <ch@hpl.hp.com>
11 * Based on fragments of previous driver by Rusell King et al.
12 *
13 * Modified for LH7A404 from ohci-sa1111.c
14 * by Durgesh Pattamatta <pattamattad@sharpsec.com>
15 *
16 * This file is licenced under the GPL.
17 */
18
19#include <linux/platform_device.h>
20
21#include <asm/hardware.h>
22
23
24extern int usb_disabled(void);
25
26/*-------------------------------------------------------------------------*/
27
28static void lh7a404_start_hc(struct platform_device *dev)
29{
30 printk(KERN_DEBUG __FILE__
31 ": starting LH7A404 OHCI USB Controller\n");
32
33 /*
34 * Now, carefully enable the USB clock, and take
35 * the USB host controller out of reset.
36 */
37 CSC_PWRCNT |= CSC_PWRCNT_USBH_EN; /* Enable clock */
38 udelay(1000);
39 USBH_CMDSTATUS = OHCI_HCR;
40
41 printk(KERN_DEBUG __FILE__
42 ": Clock to USB host has been enabled \n");
43}
44
45static void lh7a404_stop_hc(struct platform_device *dev)
46{
47 printk(KERN_DEBUG __FILE__
48 ": stopping LH7A404 OHCI USB Controller\n");
49
50 CSC_PWRCNT &= ~CSC_PWRCNT_USBH_EN; /* Disable clock */
51}
52
53
54/*-------------------------------------------------------------------------*/
55
56/* configure so an HC device and id are always provided */
57/* always called with process context; sleeping is OK */
58
59
60/**
61 * usb_hcd_lh7a404_probe - initialize LH7A404-based HCDs
62 * Context: !in_interrupt()
63 *
64 * Allocates basic resources for this USB host controller, and
65 * then invokes the start() method for the HCD associated with it
66 * through the hotplug entry's driver_data.
67 *
68 */
69int usb_hcd_lh7a404_probe (const struct hc_driver *driver,
70 struct platform_device *dev)
71{
72 int retval;
73 struct usb_hcd *hcd;
74
75 if (dev->resource[1].flags != IORESOURCE_IRQ) {
76 pr_debug("resource[1] is not IORESOURCE_IRQ");
77 return -ENOMEM;
78 }
79
80 hcd = usb_create_hcd(driver, &dev->dev, "lh7a404");
81 if (!hcd)
82 return -ENOMEM;
83 hcd->rsrc_start = dev->resource[0].start;
84 hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
85
86 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
87 pr_debug("request_mem_region failed");
88 retval = -EBUSY;
89 goto err1;
90 }
91
92 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
93 if (!hcd->regs) {
94 pr_debug("ioremap failed");
95 retval = -ENOMEM;
96 goto err2;
97 }
98
99 lh7a404_start_hc(dev);
100 ohci_hcd_init(hcd_to_ohci(hcd));
101
102 retval = usb_add_hcd(hcd, dev->resource[1].start, SA_INTERRUPT);
103 if (retval == 0)
104 return retval;
105
106 lh7a404_stop_hc(dev);
107 iounmap(hcd->regs);
108 err2:
109 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
110 err1:
111 usb_put_hcd(hcd);
112 return retval;
113}
114
115
116/* may be called without controller electrically present */
117/* may be called with controller, bus, and devices active */
118
119/**
120 * usb_hcd_lh7a404_remove - shutdown processing for LH7A404-based HCDs
121 * @dev: USB Host Controller being removed
122 * Context: !in_interrupt()
123 *
124 * Reverses the effect of usb_hcd_lh7a404_probe(), first invoking
125 * the HCD's stop() method. It is always called from a thread
126 * context, normally "rmmod", "apmd", or something similar.
127 *
128 */
129void usb_hcd_lh7a404_remove (struct usb_hcd *hcd, struct platform_device *dev)
130{
131 usb_remove_hcd(hcd);
132 lh7a404_stop_hc(dev);
133 iounmap(hcd->regs);
134 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
135 usb_put_hcd(hcd);
136}
137
138/*-------------------------------------------------------------------------*/
139
140static int __devinit
141ohci_lh7a404_start (struct usb_hcd *hcd)
142{
143 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
144 int ret;
145
146 ohci_dbg (ohci, "ohci_lh7a404_start, ohci:%p", ohci);
147 if ((ret = ohci_init(ohci)) < 0)
148 return ret;
149
150 if ((ret = ohci_run (ohci)) < 0) {
151 err ("can't start %s", hcd->self.bus_name);
152 ohci_stop (hcd);
153 return ret;
154 }
155 return 0;
156}
157
158/*-------------------------------------------------------------------------*/
159
160static const struct hc_driver ohci_lh7a404_hc_driver = {
161 .description = hcd_name,
162 .product_desc = "LH7A404 OHCI",
163 .hcd_priv_size = sizeof(struct ohci_hcd),
164
165 /*
166 * generic hardware linkage
167 */
168 .irq = ohci_irq,
169 .flags = HCD_USB11 | HCD_MEMORY,
170
171 /*
172 * basic lifecycle operations
173 */
174 .start = ohci_lh7a404_start,
175#ifdef CONFIG_PM
176 /* suspend: ohci_lh7a404_suspend, -- tbd */
177 /* resume: ohci_lh7a404_resume, -- tbd */
178#endif /*CONFIG_PM*/
179 .stop = ohci_stop,
180
181 /*
182 * managing i/o requests and associated device resources
183 */
184 .urb_enqueue = ohci_urb_enqueue,
185 .urb_dequeue = ohci_urb_dequeue,
186 .endpoint_disable = ohci_endpoint_disable,
187
188 /*
189 * scheduling support
190 */
191 .get_frame_number = ohci_get_frame,
192
193 /*
194 * root hub support
195 */
196 .hub_status_data = ohci_hub_status_data,
197 .hub_control = ohci_hub_control,
198#ifdef CONFIG_PM
199 .bus_suspend = ohci_bus_suspend,
200 .bus_resume = ohci_bus_resume,
201#endif
202 .start_port_reset = ohci_start_port_reset,
203};
204
205/*-------------------------------------------------------------------------*/
206
207static int ohci_hcd_lh7a404_drv_probe(struct platform_device *pdev)
208{
209 int ret;
210
211 pr_debug ("In ohci_hcd_lh7a404_drv_probe");
212
213 if (usb_disabled())
214 return -ENODEV;
215
216 ret = usb_hcd_lh7a404_probe(&ohci_lh7a404_hc_driver, pdev);
217 return ret;
218}
219
220static int ohci_hcd_lh7a404_drv_remove(struct platform_device *pdev)
221{
222 struct usb_hcd *hcd = platform_get_drvdata(pdev);
223
224 usb_hcd_lh7a404_remove(hcd, pdev);
225 return 0;
226}
227 /*TBD*/
228/*static int ohci_hcd_lh7a404_drv_suspend(struct platform_device *dev)
229{
230 struct usb_hcd *hcd = platform_get_drvdata(dev);
231
232 return 0;
233}
234static int ohci_hcd_lh7a404_drv_resume(struct platform_device *dev)
235{
236 struct usb_hcd *hcd = platform_get_drvdata(dev);
237
238
239 return 0;
240}
241*/
242
243static struct platform_driver ohci_hcd_lh7a404_driver = {
244 .probe = ohci_hcd_lh7a404_drv_probe,
245 .remove = ohci_hcd_lh7a404_drv_remove,
246 /*.suspend = ohci_hcd_lh7a404_drv_suspend, */
247 /*.resume = ohci_hcd_lh7a404_drv_resume, */
248 .driver = {
249 .name = "lh7a404-ohci",
250 .owner = THIS_MODULE,
251 },
252};
253
254static int __init ohci_hcd_lh7a404_init (void)
255{
256 pr_debug (DRIVER_INFO " (LH7A404)");
257 pr_debug ("block sizes: ed %d td %d\n",
258 sizeof (struct ed), sizeof (struct td));
259
260 return platform_driver_register(&ohci_hcd_lh7a404_driver);
261}
262
263static void __exit ohci_hcd_lh7a404_cleanup (void)
264{
265 platform_driver_unregister(&ohci_hcd_lh7a404_driver);
266}
267
268module_init (ohci_hcd_lh7a404_init);
269module_exit (ohci_hcd_lh7a404_cleanup);