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 Russell 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#include <linux/signal.h>
23
24#include <asm/mach-au1x00/au1000.h>
25
26#ifndef CONFIG_SOC_AU1200
27
28#define USBH_ENABLE_BE (1<<0)
29#define USBH_ENABLE_C (1<<1)
30#define USBH_ENABLE_E (1<<2)
31#define USBH_ENABLE_CE (1<<3)
32#define USBH_ENABLE_RD (1<<4)
33
34#ifdef __LITTLE_ENDIAN
35#define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C)
36#elif __BIG_ENDIAN
37#define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C | \
38 USBH_ENABLE_BE)
39#else
40#error not byte order defined
41#endif
42
43#else /* Au1200 */
44
45#define USB_HOST_CONFIG (USB_MSR_BASE + USB_MSR_MCFG)
46#define USB_MCFG_PFEN (1<<31)
47#define USB_MCFG_RDCOMB (1<<30)
48#define USB_MCFG_SSDEN (1<<23)
49#define USB_MCFG_OHCCLKEN (1<<16)
50#ifdef CONFIG_DMA_COHERENT
51#define USB_MCFG_UCAM (1<<7)
52#else
53#define USB_MCFG_UCAM (0)
54#endif
55#define USB_MCFG_OBMEN (1<<1)
56#define USB_MCFG_OMEMEN (1<<0)
57
58#define USBH_ENABLE_CE USB_MCFG_OHCCLKEN
59
60#define USBH_ENABLE_INIT (USB_MCFG_PFEN | USB_MCFG_RDCOMB | \
61 USBH_ENABLE_CE | USB_MCFG_SSDEN | \
62 USB_MCFG_UCAM | \
63 USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
64
65#define USBH_DISABLE (USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
66
67#endif /* Au1200 */
68
69extern int usb_disabled(void);
70
71static void au1xxx_start_ohc(void)
72{
73 /* enable host controller */
74#ifndef CONFIG_SOC_AU1200
75 au_writel(USBH_ENABLE_CE, USB_HOST_CONFIG);
76 au_sync();
77 udelay(1000);
78
79 au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_INIT, USB_HOST_CONFIG);
80 au_sync();
81 udelay(1000);
82
83 /* wait for reset complete (read register twice; see au1500 errata) */
84 while (au_readl(USB_HOST_CONFIG),
85 !(au_readl(USB_HOST_CONFIG) & USBH_ENABLE_RD))
86 udelay(1000);
87
88#else /* Au1200 */
89 au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_CE, USB_HOST_CONFIG);
90 au_sync();
91 udelay(1000);
92
93 au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_INIT, USB_HOST_CONFIG);
94 au_sync();
95 udelay(2000);
96#endif /* Au1200 */
97}
98
99static void au1xxx_stop_ohc(void)
100{
101#ifdef CONFIG_SOC_AU1200
102 /* Disable mem */
103 au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_DISABLE, USB_HOST_CONFIG);
104 au_sync();
105 udelay(1000);
106#endif
107 /* Disable clock */
108 au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_ENABLE_CE, USB_HOST_CONFIG);
109 au_sync();
110}
111
112static int __devinit ohci_au1xxx_start(struct usb_hcd *hcd)
113{
114 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
115 int ret;
116
117 ohci_dbg(ohci, "ohci_au1xxx_start, ohci:%p", ohci);
118
119 if ((ret = ohci_init(ohci)) < 0)
120 return ret;
121
122 if ((ret = ohci_run(ohci)) < 0) {
123 err ("can't start %s", hcd->self.bus_name);
124 ohci_stop(hcd);
125 return ret;
126 }
127
128 return 0;
129}
130
131static const struct hc_driver ohci_au1xxx_hc_driver = {
132 .description = hcd_name,
133 .product_desc = "Au1xxx OHCI",
134 .hcd_priv_size = sizeof(struct ohci_hcd),
135
136 /*
137 * generic hardware linkage
138 */
139 .irq = ohci_irq,
140 .flags = HCD_USB11 | HCD_MEMORY,
141
142 /*
143 * basic lifecycle operations
144 */
145 .start = ohci_au1xxx_start,
146 .stop = ohci_stop,
147 .shutdown = ohci_shutdown,
148
149 /*
150 * managing i/o requests and associated device resources
151 */
152 .urb_enqueue = ohci_urb_enqueue,
153 .urb_dequeue = ohci_urb_dequeue,
154 .endpoint_disable = ohci_endpoint_disable,
155
156 /*
157 * scheduling support
158 */
159 .get_frame_number = ohci_get_frame,
160
161 /*
162 * root hub support
163 */
164 .hub_status_data = ohci_hub_status_data,
165 .hub_control = ohci_hub_control,
166 .hub_irq_enable = ohci_rhsc_enable,
167#ifdef CONFIG_PM
168 .bus_suspend = ohci_bus_suspend,
169 .bus_resume = ohci_bus_resume,
170#endif
171 .start_port_reset = ohci_start_port_reset,
172};
173
174static int ohci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
175{
176 int ret;
177 struct usb_hcd *hcd;
178
179 if (usb_disabled())
180 return -ENODEV;
181
182#if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
183 /* Au1200 AB USB does not support coherent memory */
184 if (!(read_c0_prid() & 0xff)) {
185 printk(KERN_INFO "%s: this is chip revision AB !!\n",
186 pdev->name);
187 printk(KERN_INFO "%s: update your board or re-configure "
188 "the kernel\n", pdev->name);
189 return -ENODEV;
190 }
191#endif
192
193 if (pdev->resource[1].flags != IORESOURCE_IRQ) {
194 pr_debug("resource[1] is not IORESOURCE_IRQ\n");
195 return -ENOMEM;
196 }
197
198 hcd = usb_create_hcd(&ohci_au1xxx_hc_driver, &pdev->dev, "au1xxx");
199 if (!hcd)
200 return -ENOMEM;
201
202 hcd->rsrc_start = pdev->resource[0].start;
203 hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
204
205 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
206 pr_debug("request_mem_region failed\n");
207 ret = -EBUSY;
208 goto err1;
209 }
210
211 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
212 if (!hcd->regs) {
213 pr_debug("ioremap failed\n");
214 ret = -ENOMEM;
215 goto err2;
216 }
217
218 au1xxx_start_ohc();
219 ohci_hcd_init(hcd_to_ohci(hcd));
220
221 ret = usb_add_hcd(hcd, pdev->resource[1].start,
222 IRQF_DISABLED | IRQF_SHARED);
223 if (ret == 0) {
224 platform_set_drvdata(pdev, hcd);
225 return ret;
226 }
227
228 au1xxx_stop_ohc();
229 iounmap(hcd->regs);
230err2:
231 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
232err1:
233 usb_put_hcd(hcd);
234 return ret;
235}
236
237static int ohci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
238{
239 struct usb_hcd *hcd = platform_get_drvdata(pdev);
240
241 usb_remove_hcd(hcd);
242 au1xxx_stop_ohc();
243 iounmap(hcd->regs);
244 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
245 usb_put_hcd(hcd);
246 platform_set_drvdata(pdev, NULL);
247
248 return 0;
249}
250
251#ifdef CONFIG_PM
252static int ohci_hcd_au1xxx_drv_suspend(struct platform_device *pdev,
253 pm_message_t message)
254{
255 struct usb_hcd *hcd = platform_get_drvdata(pdev);
256 struct ohci_hcd *ohci = hcd_to_ohci(hcd);
257 unsigned long flags;
258 int rc;
259
260 rc = 0;
261
262 /* Root hub was already suspended. Disable irq emission and
263 * mark HW unaccessible, bail out if RH has been resumed. Use
264 * the spinlock to properly synchronize with possible pending
265 * RH suspend or resume activity.
266 *
267 * This is still racy as hcd->state is manipulated outside of
268 * any locks =P But that will be a different fix.
269 */
270 spin_lock_irqsave(&ohci->lock, flags);
271 if (hcd->state != HC_STATE_SUSPENDED) {
272 rc = -EINVAL;
273 goto bail;
274 }
275 ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
276 (void)ohci_readl(ohci, &ohci->regs->intrdisable);
277
278 /* make sure snapshot being resumed re-enumerates everything */
279 if (message.event == PM_EVENT_PRETHAW)
280 ohci_usb_reset(ohci);
281
282 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
283
284 au1xxx_stop_ohc();
285bail:
286 spin_unlock_irqrestore(&ohci->lock, flags);
287
288 return rc;
289}
290
291static int ohci_hcd_au1xxx_drv_resume(struct platform_device *pdev)
292{
293 struct usb_hcd *hcd = platform_get_drvdata(pdev);
294
295 au1xxx_start_ohc();
296
297 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
298 ohci_finish_controller_resume(hcd);
299
300 return 0;
301}
302#else
303#define ohci_hcd_au1xxx_drv_suspend NULL
304#define ohci_hcd_au1xxx_drv_resume NULL
305#endif
306
307static struct platform_driver ohci_hcd_au1xxx_driver = {
308 .probe = ohci_hcd_au1xxx_drv_probe,
309 .remove = ohci_hcd_au1xxx_drv_remove,
310 .shutdown = usb_hcd_platform_shutdown,
311 .suspend = ohci_hcd_au1xxx_drv_suspend,
312 .resume = ohci_hcd_au1xxx_drv_resume,
313 .driver = {
314 .name = "au1xxx-ohci",
315 .owner = THIS_MODULE,
316 },
317};
318
319MODULE_ALIAS("platform:au1xxx-ohci");