aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb/host/ohci-au1xxx.c
blob: 958d985f29513f36b2840b77a532c09a7bafa45e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
/*
 * OHCI HCD (Host Controller Driver) for USB.
 *
 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
 * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
 * (C) Copyright 2002 Hewlett-Packard Company
 *
 * Bus Glue for AMD Alchemy Au1xxx
 *
 * Written by Christopher Hoover <ch@hpl.hp.com>
 * Based on fragments of previous driver by Russell King et al.
 *
 * Modified for LH7A404 from ohci-sa1111.c
 *  by Durgesh Pattamatta <pattamattad@sharpsec.com>
 * Modified for AMD Alchemy Au1xxx
 *  by Matt Porter <mporter@kernel.crashing.org>
 *
 * This file is licenced under the GPL.
 */

#include <linux/platform_device.h>
#include <linux/signal.h>

#include <asm/mach-au1x00/au1000.h>

#ifndef	CONFIG_SOC_AU1200

#define USBH_ENABLE_BE (1<<0)
#define USBH_ENABLE_C  (1<<1)
#define USBH_ENABLE_E  (1<<2)
#define USBH_ENABLE_CE (1<<3)
#define USBH_ENABLE_RD (1<<4)

#ifdef __LITTLE_ENDIAN
#define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C)
#elif defined(__BIG_ENDIAN)
#define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C | \
			  USBH_ENABLE_BE)
#else
#error not byte order defined
#endif

#else   /* Au1200 */

#define USB_HOST_CONFIG    (USB_MSR_BASE + USB_MSR_MCFG)
#define USB_MCFG_PFEN     (1<<31)
#define USB_MCFG_RDCOMB   (1<<30)
#define USB_MCFG_SSDEN    (1<<23)
#define USB_MCFG_OHCCLKEN (1<<16)
#ifdef CONFIG_DMA_COHERENT
#define USB_MCFG_UCAM     (1<<7)
#else
#define USB_MCFG_UCAM     (0)
#endif
#define USB_MCFG_OBMEN    (1<<1)
#define USB_MCFG_OMEMEN   (1<<0)

#define USBH_ENABLE_CE    USB_MCFG_OHCCLKEN

#define USBH_ENABLE_INIT  (USB_MCFG_PFEN  | USB_MCFG_RDCOMB 	|	\
			   USBH_ENABLE_CE | USB_MCFG_SSDEN	|	\
			   USB_MCFG_UCAM  |				\
			   USB_MCFG_OBMEN | USB_MCFG_OMEMEN)

#define USBH_DISABLE      (USB_MCFG_OBMEN | USB_MCFG_OMEMEN)

#endif  /* Au1200 */

extern int usb_disabled(void);

static void au1xxx_start_ohc(void)
{
	/* enable host controller */
#ifndef CONFIG_SOC_AU1200
	au_writel(USBH_ENABLE_CE, USB_HOST_CONFIG);
	au_sync();
	udelay(1000);

	au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_INIT, USB_HOST_CONFIG);
	au_sync();
	udelay(1000);

	/* wait for reset complete (read register twice; see au1500 errata) */
	while (au_readl(USB_HOST_CONFIG),
		!(au_readl(USB_HOST_CONFIG) & USBH_ENABLE_RD))
		udelay(1000);

#else   /* Au1200 */
	au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_CE, USB_HOST_CONFIG);
	au_sync();
	udelay(1000);

	au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_INIT, USB_HOST_CONFIG);
	au_sync();
	udelay(2000);
#endif  /* Au1200 */
}

static void au1xxx_stop_ohc(void)
{
#ifdef CONFIG_SOC_AU1200
	/* Disable mem */
	au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_DISABLE, USB_HOST_CONFIG);
	au_sync();
	udelay(1000);
#endif
	/* Disable clock */
	au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_ENABLE_CE, USB_HOST_CONFIG);
	au_sync();
}

static int __devinit ohci_au1xxx_start(struct usb_hcd *hcd)
{
	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
	int ret;

	ohci_dbg(ohci, "ohci_au1xxx_start, ohci:%p", ohci);

	if ((ret = ohci_init(ohci)) < 0)
		return ret;

	if ((ret = ohci_run(ohci)) < 0) {
		err ("can't start %s", hcd->self.bus_name);
		ohci_stop(hcd);
		return ret;
	}

	return 0;
}

static const struct hc_driver ohci_au1xxx_hc_driver = {
	.description =		hcd_name,
	.product_desc =		"Au1xxx OHCI",
	.hcd_priv_size =	sizeof(struct ohci_hcd),

	/*
	 * generic hardware linkage
	 */
	.irq =			ohci_irq,
	.flags =		HCD_USB11 | HCD_MEMORY,

	/*
	 * basic lifecycle operations
	 */
	.start =		ohci_au1xxx_start,
	.stop =			ohci_stop,
	.shutdown =		ohci_shutdown,

	/*
	 * managing i/o requests and associated device resources
	 */
	.urb_enqueue =		ohci_urb_enqueue,
	.urb_dequeue =		ohci_urb_dequeue,
	.endpoint_disable =	ohci_endpoint_disable,

	/*
	 * scheduling support
	 */
	.get_frame_number =	ohci_get_frame,

	/*
	 * root hub support
	 */
	.hub_status_data =	ohci_hub_status_data,
	.hub_control =		ohci_hub_control,
#ifdef	CONFIG_PM
	.bus_suspend =		ohci_bus_suspend,
	.bus_resume =		ohci_bus_resume,
#endif
	.start_port_reset =	ohci_start_port_reset,
};

static int ohci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
{
	int ret;
	struct usb_hcd *hcd;

	if (usb_disabled())
		return -ENODEV;

#if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
	/* Au1200 AB USB does not support coherent memory */
	if (!(read_c0_prid() & 0xff)) {
		printk(KERN_INFO "%s: this is chip revision AB !!\n",
			pdev->name);
		printk(KERN_INFO "%s: update your board or re-configure "
				 "the kernel\n", pdev->name);
		return -ENODEV;
	}
#endif

	if (pdev->resource[1].flags != IORESOURCE_IRQ) {
		pr_debug("resource[1] is not IORESOURCE_IRQ\n");
		return -ENOMEM;
	}

	hcd = usb_create_hcd(&ohci_au1xxx_hc_driver, &pdev->dev, "au1xxx");
	if (!hcd)
		return -ENOMEM;

	hcd->rsrc_start = pdev->resource[0].start;
	hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;

	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
		pr_debug("request_mem_region failed\n");
		ret = -EBUSY;
		goto err1;
	}

	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
	if (!hcd->regs) {
		pr_debug("ioremap failed\n");
		ret = -ENOMEM;
		goto err2;
	}

	au1xxx_start_ohc();
	ohci_hcd_init(hcd_to_ohci(hcd));

	ret = usb_add_hcd(hcd, pdev->resource[1].start,
			  IRQF_DISABLED | IRQF_SHARED);
	if (ret == 0) {
		platform_set_drvdata(pdev, hcd);
		return ret;
	}

	au1xxx_stop_ohc();
	iounmap(hcd->regs);
err2:
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err1:
	usb_put_hcd(hcd);
	return ret;
}

static int ohci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
{
	struct usb_hcd *hcd = platform_get_drvdata(pdev);

	usb_remove_hcd(hcd);
	au1xxx_stop_ohc();
	iounmap(hcd->regs);
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
	usb_put_hcd(hcd);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

#ifdef CONFIG_PM
static int ohci_hcd_au1xxx_drv_suspend(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);
	struct ohci_hcd	*ohci = hcd_to_ohci(hcd);
	unsigned long flags;
	int rc;

	rc = 0;

	/* Root hub was already suspended. Disable irq emission and
	 * mark HW unaccessible, bail out if RH has been resumed. Use
	 * the spinlock to properly synchronize with possible pending
	 * RH suspend or resume activity.
	 *
	 * This is still racy as hcd->state is manipulated outside of
	 * any locks =P But that will be a different fix.
	 */
	spin_lock_irqsave(&ohci->lock, flags);
	if (hcd->state != HC_STATE_SUSPENDED) {
		rc = -EINVAL;
		goto bail;
	}
	ohci_writel(ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
	(void)ohci_readl(ohci, &ohci->regs->intrdisable);

	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);

	au1xxx_stop_ohc();
bail:
	spin_unlock_irqrestore(&ohci->lock, flags);

	return rc;
}

static int ohci_hcd_au1xxx_drv_resume(struct device *dev)
{
	struct usb_hcd *hcd = dev_get_drvdata(dev);

	au1xxx_start_ohc();

	set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
	ohci_finish_controller_resume(hcd);

	return 0;
}

static const struct dev_pm_ops au1xxx_ohci_pmops = {
	.suspend	= ohci_hcd_au1xxx_drv_suspend,
	.resume		= ohci_hcd_au1xxx_drv_resume,
};

#define AU1XXX_OHCI_PMOPS &au1xxx_ohci_pmops

#else
#define AU1XXX_OHCI_PMOPS NULL
#endif

static struct platform_driver ohci_hcd_au1xxx_driver = {
	.probe		= ohci_hcd_au1xxx_drv_probe,
	.remove		= ohci_hcd_au1xxx_drv_remove,
	.shutdown	= usb_hcd_platform_shutdown,
	.driver		= {
		.name	= "au1xxx-ohci",
		.owner	= THIS_MODULE,
		.pm	= AU1XXX_OHCI_PMOPS,
	},
};

MODULE_ALIAS("platform:au1xxx-ohci");