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 AMD Alchemy Au1xxx
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 * Modified for AMD Alchemy Au1xxx
16 * by Matt Porter <mporter@kernel.crashing.org>
17 *
18 * This file is licenced under the GPL.
19 */
20
21#include <linux/platform_device.h>
22
23#include <asm/mach-au1x00/au1000.h>
24
25#define USBH_ENABLE_BE (1<<0)
26#define USBH_ENABLE_C (1<<1)
27#define USBH_ENABLE_E (1<<2)
28#define USBH_ENABLE_CE (1<<3)
29#define USBH_ENABLE_RD (1<<4)
30
31#ifdef __LITTLE_ENDIAN
32#define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C)
33#elif __BIG_ENDIAN
34#define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C | USBH_ENABLE_BE)
35#else
36#error not byte order defined
37#endif
38
39extern int usb_disabled(void);
40
41/*-------------------------------------------------------------------------*/
42
43static void au1xxx_start_hc(struct platform_device *dev)
44{
45 printk(KERN_DEBUG __FILE__
46 ": starting Au1xxx OHCI USB Controller\n");
47
48 /* enable host controller */
49 au_writel(USBH_ENABLE_CE, USB_HOST_CONFIG);
50 udelay(1000);
51 au_writel(USBH_ENABLE_INIT, USB_HOST_CONFIG);
52 udelay(1000);
53
54 /* wait for reset complete (read register twice; see au1500 errata) */
55 while (au_readl(USB_HOST_CONFIG),
56 !(au_readl(USB_HOST_CONFIG) & USBH_ENABLE_RD))
57 udelay(1000);
58
59 printk(KERN_DEBUG __FILE__
60 ": Clock to USB host has been enabled \n");
61}
62
63static void au1xxx_stop_hc(struct platform_device *dev)
64{
65 printk(KERN_DEBUG __FILE__
66 ": stopping Au1xxx OHCI USB Controller\n");
67
68 /* Disable clock */
69 au_writel(readl((void *)USB_HOST_CONFIG) & ~USBH_ENABLE_CE, USB_HOST_CONFIG);
70}
71
72
73/*-------------------------------------------------------------------------*/
74
75/* configure so an HC device and id are always provided */
76/* always called with process context; sleeping is OK */
77
78
79/**
80 * usb_hcd_au1xxx_probe - initialize Au1xxx-based HCDs
81 * Context: !in_interrupt()
82 *
83 * Allocates basic resources for this USB host controller, and
84 * then invokes the start() method for the HCD associated with it
85 * through the hotplug entry's driver_data.
86 *
87 */
88int usb_hcd_au1xxx_probe (const struct hc_driver *driver,
89 struct platform_device *dev)
90{
91 int retval;
92 struct usb_hcd *hcd;
93
94 if(dev->resource[1].flags != IORESOURCE_IRQ) {
95 pr_debug ("resource[1] is not IORESOURCE_IRQ");
96 return -ENOMEM;
97 }
98
99 hcd = usb_create_hcd(driver, &dev->dev, "au1xxx");
100 if (!hcd)
101 return -ENOMEM;
102 hcd->rsrc_start = dev->resource[0].start;
103 hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
104
105 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
106 pr_debug("request_mem_region failed");
107 retval = -EBUSY;
108 goto err1;
109 }
110
111 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
112 if (!hcd->regs) {
113 pr_debug("ioremap failed");
114 retval = -ENOMEM;
115 goto err2;
116 }
117
118 au1xxx_start_hc(dev);
119 ohci_hcd_init(hcd_to_ohci(hcd));
120
121 retval = usb_add_hcd(hcd, dev->resource[1].start, SA_INTERRUPT);
122 if (retval == 0)
123 return retval;
124
125 au1xxx_stop_hc(dev);
126 iounmap(hcd->regs);
127 err2:
128 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
129 err1:
130 usb_put_hcd(hcd);
131 return retval;
132}
133
134
135/* may be called without controller electrically present */
136/* may be called with controller, bus, and devices active */
137
138/**
139 * usb_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
140 * @dev: USB Host Controller being removed
141 * Context: !in_interrupt()
142 *
143 * Reverses the effect of usb_hcd_au1xxx_probe(), first invoking
144 * the HCD's stop() method. It is always called from a thread
145 * context, normally "rmmod", "apmd", or something similar.
146 *
147 */
148void usb_hcd_au1xxx_remove (struct usb_hcd *hcd, struct platform_device *dev)
149{
150 usb_remove_hcd(hcd);
151 au1xxx_stop_hc(dev);
152 iounmap(hcd->regs);
153 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
154 usb_put_hcd(hcd);
155}
156
157/*-------------------------------------------------------------------------*/
158
159static int __devinit
160ohci_au1xxx_start (struct usb_hcd *hcd)
161{
162 struct ohci_hcd *ohci = hcd_to_ohci (hcd);
163 int ret;
164
165 ohci_dbg (ohci, "ohci_au1xxx_start, ohci:%p", ohci);
166
167 if ((ret = ohci_init (ohci)) < 0)
168 return ret;
169
170 if ((ret = ohci_run (ohci)) < 0) {
171 err ("can't start %s", hcd->self.bus_name);
172 ohci_stop (hcd);
173 return ret;
174 }
175
176 return 0;
177}
178
179/*-------------------------------------------------------------------------*/
180
181static const struct hc_driver ohci_au1xxx_hc_driver = {
182 .description = hcd_name,
183 .product_desc = "Au1xxx OHCI",
184 .hcd_priv_size = sizeof(struct ohci_hcd),
185
186 /*
187 * generic hardware linkage
188 */
189 .irq = ohci_irq,
190 .flags = HCD_USB11 | HCD_MEMORY,
191
192 /*
193 * basic lifecycle operations
194 */
195 .start = ohci_au1xxx_start,
196#ifdef CONFIG_PM
197 /* suspend: ohci_au1xxx_suspend, -- tbd */
198 /* resume: ohci_au1xxx_resume, -- tbd */
199#endif /*CONFIG_PM*/
200 .stop = ohci_stop,
201
202 /*
203 * managing i/o requests and associated device resources
204 */
205 .urb_enqueue = ohci_urb_enqueue,
206 .urb_dequeue = ohci_urb_dequeue,
207 .endpoint_disable = ohci_endpoint_disable,
208
209 /*
210 * scheduling support
211 */
212 .get_frame_number = ohci_get_frame,
213
214 /*
215 * root hub support
216 */
217 .hub_status_data = ohci_hub_status_data,
218 .hub_control = ohci_hub_control,
219#ifdef CONFIG_PM
220 .bus_suspend = ohci_bus_suspend,
221 .bus_resume = ohci_bus_resume,
222#endif
223 .start_port_reset = ohci_start_port_reset,
224};
225
226/*-------------------------------------------------------------------------*/
227
228static int ohci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
229{
230 int ret;
231
232 pr_debug ("In ohci_hcd_au1xxx_drv_probe");
233
234 if (usb_disabled())
235 return -ENODEV;
236
237 ret = usb_hcd_au1xxx_probe(&ohci_au1xxx_hc_driver, pdev);
238 return ret;
239}
240
241static int ohci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
242{
243 struct usb_hcd *hcd = platform_get_drvdata(pdev);
244
245 usb_hcd_au1xxx_remove(hcd, pdev);
246 return 0;
247}
248 /*TBD*/
249/*static int ohci_hcd_au1xxx_drv_suspend(struct platform_device *dev)
250{
251 struct usb_hcd *hcd = platform_get_drvdata(dev);
252
253 return 0;
254}
255static int ohci_hcd_au1xxx_drv_resume(struct platform_device *dev)
256{
257 struct usb_hcd *hcd = platform_get_drvdata(dev);
258
259 return 0;
260}
261*/
262
263static struct platform_driver ohci_hcd_au1xxx_driver = {
264 .probe = ohci_hcd_au1xxx_drv_probe,
265 .remove = ohci_hcd_au1xxx_drv_remove,
266 /*.suspend = ohci_hcd_au1xxx_drv_suspend, */
267 /*.resume = ohci_hcd_au1xxx_drv_resume, */
268 .driver = {
269 .name = "au1xxx-ohci",
270 .owner = THIS_MODULE,
271 },
272};
273
274static int __init ohci_hcd_au1xxx_init (void)
275{
276 pr_debug (DRIVER_INFO " (Au1xxx)");
277 pr_debug ("block sizes: ed %d td %d\n",
278 sizeof (struct ed), sizeof (struct td));
279
280 return platform_driver_register(&ohci_hcd_au1xxx_driver);
281}
282
283static void __exit ohci_hcd_au1xxx_cleanup (void)
284{
285 platform_driver_unregister(&ohci_hcd_au1xxx_driver);
286}
287
288module_init (ohci_hcd_au1xxx_init);
289module_exit (ohci_hcd_au1xxx_cleanup);