summaryrefslogtreecommitdiffstats
path: root/drivers/usb/dwc3/dwc3-pci.c
blob: f77c000426851427d8dfb176e8bb3fdcbd9f913a (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
/**
 * dwc3-pci.c - PCI Specific glue layer
 *
 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
 *
 * Authors: Felipe Balbi <balbi@ti.com>,
 *	    Sebastian Andrzej Siewior <bigeasy@linutronix.de>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The names of the above-listed copyright holders may not be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * ALTERNATIVELY, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2, as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/platform_device.h>

/* FIXME define these in <linux/pci_ids.h> */
#define PCI_VENDOR_ID_SYNOPSYS		0x16c3
#define PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3	0xabcd

#define DWC3_PCI_DEVS_POSSIBLE	32

struct dwc3_pci {
	struct device		*dev;
	struct platform_device	*dwc3;
};

static DECLARE_BITMAP(dwc3_pci_devs, DWC3_PCI_DEVS_POSSIBLE);

static int dwc3_pci_get_device_id(struct dwc3_pci *glue)
{
	int		id;

again:
	id = find_first_zero_bit(dwc3_pci_devs, DWC3_PCI_DEVS_POSSIBLE);
	if (id < DWC3_PCI_DEVS_POSSIBLE) {
		int old;

		old = test_and_set_bit(id, dwc3_pci_devs);
		if (old)
			goto again;
	} else {
		dev_err(glue->dev, "no space for new device\n");
		id = -ENOMEM;
	}

	return 0;
}

static void dwc3_pci_put_device_id(struct dwc3_pci *glue, int id)
{
	int			ret;

	if (id < 0)
		return;

	ret = test_bit(id, dwc3_pci_devs);
	WARN(!ret, "Device: %s\nID %d not in use\n",
			dev_driver_string(glue->dev), id);
	clear_bit(id, dwc3_pci_devs);
}

static int __devinit dwc3_pci_probe(struct pci_dev *pci,
		const struct pci_device_id *id)
{
	struct resource		res[2];
	struct platform_device	*dwc3;
	struct dwc3_pci		*glue;
	int			ret = -ENOMEM;
	int			devid;

	glue = kzalloc(sizeof(*glue), GFP_KERNEL);
	if (!glue) {
		dev_err(&pci->dev, "not enough memory\n");
		goto err0;
	}

	glue->dev	= &pci->dev;

	ret = pci_enable_device(pci);
	if (ret) {
		dev_err(&pci->dev, "failed to enable pci device\n");
		goto err1;
	}

	pci_set_power_state(pci, PCI_D0);
	pci_set_master(pci);

	devid = dwc3_pci_get_device_id(glue);
	if (devid < 0)
		goto err2;

	dwc3 = platform_device_alloc("dwc3-pci", devid);
	if (!dwc3) {
		dev_err(&pci->dev, "couldn't allocate dwc3 device\n");
		goto err3;
	}

	memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));

	res[0].start	= pci_resource_start(pci, 0);
	res[0].end	= pci_resource_end(pci, 0);
	res[0].name	= "dwc_usb3";
	res[0].flags	= IORESOURCE_MEM;

	res[1].start	= pci->irq;
	res[1].name	= "dwc_usb3";
	res[1].flags	= IORESOURCE_IRQ;

	ret = platform_device_add_resources(dwc3, res, ARRAY_SIZE(res));
	if (ret) {
		dev_err(&pci->dev, "couldn't add resources to dwc3 device\n");
		goto err4;
	}

	pci_set_drvdata(pci, glue);

	dma_set_coherent_mask(&dwc3->dev, pci->dev.coherent_dma_mask);

	dwc3->dev.dma_mask = pci->dev.dma_mask;
	dwc3->dev.dma_parms = pci->dev.dma_parms;
	dwc3->dev.parent = &pci->dev;
	glue->dwc3	= dwc3;

	ret = platform_device_add(dwc3);
	if (ret) {
		dev_err(&pci->dev, "failed to register dwc3 device\n");
		goto err4;
	}

	return 0;

err4:
	pci_set_drvdata(pci, NULL);
	platform_device_put(dwc3);

err3:
	dwc3_pci_put_device_id(glue, devid);

err2:
	pci_disable_device(pci);

err1:
	kfree(pci);

err0:
	return ret;
}

static void __devexit dwc3_pci_remove(struct pci_dev *pci)
{
	struct dwc3_pci	*glue = pci_get_drvdata(pci);

	dwc3_pci_put_device_id(glue, glue->dwc3->id);
	platform_device_unregister(glue->dwc3);
	pci_set_drvdata(pci, NULL);
	pci_disable_device(pci);
	kfree(glue);
}

static DEFINE_PCI_DEVICE_TABLE(dwc3_pci_id_table) = {
	{
		PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
				PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3),
	},
	{  }	/* Terminating Entry */
};
MODULE_DEVICE_TABLE(pci, dwc3_pci_id_table);

static struct pci_driver dwc3_pci_driver = {
	.name		= "pci-dwc3",
	.id_table	= dwc3_pci_id_table,
	.probe		= dwc3_pci_probe,
	.remove		= __devexit_p(dwc3_pci_remove),
};

MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("DesignWare USB3 PCI Glue Layer");

static int __devinit dwc3_pci_init(void)
{
	return pci_register_driver(&dwc3_pci_driver);
}
module_init(dwc3_pci_init);

static void __exit dwc3_pci_exit(void)
{
	pci_unregister_driver(&dwc3_pci_driver);
}
module_exit(dwc3_pci_exit);
OpenPOWER on IntegriCloud