summaryrefslogtreecommitdiffstats
path: root/drivers/usb/host/uhci-grlib.c
blob: d01c1e227681940c21cd7af480243d062b9ffa40 (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
/*
 * UHCI HCD (Host Controller Driver) for GRLIB GRUSBHC
 *
 * Copyright (c) 2011 Jan Andersson <jan@gaisler.com>
 *
 * This file is based on UHCI PCI HCD:
 * (C) Copyright 1999 Linus Torvalds
 * (C) Copyright 1999-2002 Johannes Erdfelt, johannes@erdfelt.com
 * (C) Copyright 1999 Randy Dunlap
 * (C) Copyright 1999 Georg Acher, acher@in.tum.de
 * (C) Copyright 1999 Deti Fliegl, deti@fliegl.de
 * (C) Copyright 1999 Thomas Sailer, sailer@ife.ee.ethz.ch
 * (C) Copyright 1999 Roman Weissgaerber, weissg@vienna.at
 * (C) Copyright 2000 Yggdrasil Computing, Inc. (port of new PCI interface
 *               support from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
 * (C) Copyright 1999 Gregory P. Smith (from usb-ohci.c)
 * (C) Copyright 2004-2007 Alan Stern, stern@rowland.harvard.edu
 */

#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>

static int uhci_grlib_init(struct usb_hcd *hcd)
{
	struct uhci_hcd *uhci = hcd_to_uhci(hcd);

	/*
	 * Probe to determine the endianness of the controller.
	 * We know that bit 7 of the PORTSC1 register is always set
	 * and bit 15 is always clear.  If uhci_readw() yields a value
	 * with bit 7 (0x80) turned on then the current little-endian
	 * setting is correct.  Otherwise we assume the value was
	 * byte-swapped; hence the register interface and presumably
	 * also the descriptors are big-endian.
	 */
	if (!(uhci_readw(uhci, USBPORTSC1) & 0x80)) {
		uhci->big_endian_mmio = 1;
		uhci->big_endian_desc = 1;
	}

	uhci->rh_numports = uhci_count_ports(hcd);

	/* Set up pointers to to generic functions */
	uhci->reset_hc = uhci_generic_reset_hc;
	uhci->check_and_reset_hc = uhci_generic_check_and_reset_hc;
	/* No special actions need to be taken for the functions below */
	uhci->configure_hc = NULL;
	uhci->resume_detect_interrupts_are_broken = NULL;
	uhci->global_suspend_mode_is_broken = NULL;

	/* Reset if the controller isn't already safely quiescent. */
	check_and_reset_hc(uhci);
	return 0;
}

static const struct hc_driver uhci_grlib_hc_driver = {
	.description =		hcd_name,
	.product_desc =		"GRLIB GRUSBHC UHCI Host Controller",
	.hcd_priv_size =	sizeof(struct uhci_hcd),

	/* Generic hardware linkage */
	.irq =			uhci_irq,
	.flags =		HCD_MEMORY | HCD_USB11,

	/* Basic lifecycle operations */
	.reset =		uhci_grlib_init,
	.start =		uhci_start,
#ifdef CONFIG_PM
	.pci_suspend =		NULL,
	.pci_resume =		NULL,
	.bus_suspend =		uhci_rh_suspend,
	.bus_resume =		uhci_rh_resume,
#endif
	.stop =			uhci_stop,

	.urb_enqueue =		uhci_urb_enqueue,
	.urb_dequeue =		uhci_urb_dequeue,

	.endpoint_disable =	uhci_hcd_endpoint_disable,
	.get_frame_number =	uhci_hcd_get_frame_number,

	.hub_status_data =	uhci_hub_status_data,
	.hub_control =		uhci_hub_control,
};


static int __devinit uhci_hcd_grlib_probe(struct platform_device *op)
{
	struct device_node *dn = op->dev.of_node;
	struct usb_hcd *hcd;
	struct uhci_hcd	*uhci = NULL;
	struct resource res;
	int irq;
	int rv;

	if (usb_disabled())
		return -ENODEV;

	dev_dbg(&op->dev, "initializing GRUSBHC UHCI USB Controller\n");

	rv = of_address_to_resource(dn, 0, &res);
	if (rv)
		return rv;

	/* usb_create_hcd requires dma_mask != NULL */
	op->dev.dma_mask = &op->dev.coherent_dma_mask;
	hcd = usb_create_hcd(&uhci_grlib_hc_driver, &op->dev,
			"GRUSBHC UHCI USB");
	if (!hcd)
		return -ENOMEM;

	hcd->rsrc_start = res.start;
	hcd->rsrc_len = res.end - res.start + 1;

	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
		printk(KERN_ERR "%s: request_mem_region failed\n", __FILE__);
		rv = -EBUSY;
		goto err_rmr;
	}

	irq = irq_of_parse_and_map(dn, 0);
	if (irq == NO_IRQ) {
		printk(KERN_ERR "%s: irq_of_parse_and_map failed\n", __FILE__);
		rv = -EBUSY;
		goto err_irq;
	}

	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
	if (!hcd->regs) {
		printk(KERN_ERR "%s: ioremap failed\n", __FILE__);
		rv = -ENOMEM;
		goto err_ioremap;
	}

	uhci = hcd_to_uhci(hcd);

	uhci->regs = hcd->regs;

	rv = usb_add_hcd(hcd, irq, 0);
	if (rv)
		goto err_uhci;

	return 0;

err_uhci:
	iounmap(hcd->regs);
err_ioremap:
	irq_dispose_mapping(irq);
err_irq:
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err_rmr:
	usb_put_hcd(hcd);

	return rv;
}

static int uhci_hcd_grlib_remove(struct platform_device *op)
{
	struct usb_hcd *hcd = dev_get_drvdata(&op->dev);

	dev_set_drvdata(&op->dev, NULL);

	dev_dbg(&op->dev, "stopping GRLIB GRUSBHC UHCI USB Controller\n");

	usb_remove_hcd(hcd);

	iounmap(hcd->regs);
	irq_dispose_mapping(hcd->irq);
	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);

	usb_put_hcd(hcd);

	return 0;
}

/* Make sure the controller is quiescent and that we're not using it
 * any more.  This is mainly for the benefit of programs which, like kexec,
 * expect the hardware to be idle: not doing DMA or generating IRQs.
 *
 * This routine may be called in a damaged or failing kernel.  Hence we
 * do not acquire the spinlock before shutting down the controller.
 */
static void uhci_hcd_grlib_shutdown(struct platform_device *op)
{
	struct usb_hcd *hcd = dev_get_drvdata(&op->dev);

	uhci_hc_died(hcd_to_uhci(hcd));
}

static const struct of_device_id uhci_hcd_grlib_of_match[] = {
	{ .name = "GAISLER_UHCI", },
	{ .name = "01_027", },
	{},
};
MODULE_DEVICE_TABLE(of, uhci_hcd_grlib_of_match);


static struct platform_driver uhci_grlib_driver = {
	.probe		= uhci_hcd_grlib_probe,
	.remove		= uhci_hcd_grlib_remove,
	.shutdown	= uhci_hcd_grlib_shutdown,
	.driver = {
		.name = "grlib-uhci",
		.owner = THIS_MODULE,
		.of_match_table = uhci_hcd_grlib_of_match,
	},
};