dwc3-pci.c revision 0949e99b05736946cf0ac78e37194be0807e497e 
1/**
2 * dwc3-pci.c - PCI Specific glue layer
3 *
4 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
5 *
6 * Authors: Felipe Balbi <balbi@ti.com>,
7 *	    Sebastian Andrzej Siewior <bigeasy@linutronix.de>
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions, and the following disclaimer,
14 *    without modification.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The names of the above-listed copyright holders may not be used
19 *    to endorse or promote products derived from this software without
20 *    specific prior written permission.
21 *
22 * ALTERNATIVELY, this software may be distributed under the terms of the
23 * GNU General Public License ("GPL") version 2, as published by the Free
24 * Software Foundation.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
27 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
28 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
30 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
31 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
32 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
33 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
34 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
36 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 */
38
39#include <linux/kernel.h>
40#include <linux/module.h>
41#include <linux/slab.h>
42#include <linux/pci.h>
43#include <linux/platform_device.h>
44
45/* FIXME define these in <linux/pci_ids.h> */
46#define PCI_VENDOR_ID_SYNOPSYS		0x16c3
47#define PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3	0xabcd
48
49#define DWC3_PCI_DEVS_POSSIBLE	32
50
51struct dwc3_pci {
52	struct device		*dev;
53	struct platform_device	*dwc3;
54};
55
56static DECLARE_BITMAP(dwc3_pci_devs, DWC3_PCI_DEVS_POSSIBLE);
57
58static int dwc3_pci_get_device_id(struct dwc3_pci *glue)
59{
60	int		id;
61
62again:
63	id = find_first_zero_bit(dwc3_pci_devs, DWC3_PCI_DEVS_POSSIBLE);
64	if (id < DWC3_PCI_DEVS_POSSIBLE) {
65		int old;
66
67		old = test_and_set_bit(id, dwc3_pci_devs);
68		if (old)
69			goto again;
70	} else {
71		dev_err(glue->dev, "no space for new device\n");
72		id = -ENOMEM;
73	}
74
75	return 0;
76}
77
78static void dwc3_pci_put_device_id(struct dwc3_pci *glue, int id)
79{
80	int			ret;
81
82	if (id < 0)
83		return;
84
85	ret = test_bit(id, dwc3_pci_devs);
86	WARN(!ret, "Device: %s\nID %d not in use\n",
87			dev_driver_string(glue->dev), id);
88	clear_bit(id, dwc3_pci_devs);
89}
90
91static int __devinit dwc3_pci_probe(struct pci_dev *pci,
92		const struct pci_device_id *id)
93{
94	struct resource		res[2];
95	struct platform_device	*dwc3;
96	struct dwc3_pci		*glue;
97	int			ret = -ENOMEM;
98	int			devid;
99
100	glue = kzalloc(sizeof(*glue), GFP_KERNEL);
101	if (!glue) {
102		dev_err(&pci->dev, "not enough memory\n");
103		goto err0;
104	}
105
106	glue->dev	= &pci->dev;
107
108	ret = pci_enable_device(pci);
109	if (ret) {
110		dev_err(&pci->dev, "failed to enable pci device\n");
111		goto err1;
112	}
113
114	pci_set_power_state(pci, PCI_D0);
115	pci_set_master(pci);
116
117	devid = dwc3_pci_get_device_id(glue);
118	if (devid < 0)
119		goto err2;
120
121	dwc3 = platform_device_alloc("dwc3", devid);
122	if (!dwc3) {
123		dev_err(&pci->dev, "couldn't allocate dwc3 device\n");
124		goto err3;
125	}
126
127	memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));
128
129	res[0].start	= pci_resource_start(pci, 0);
130	res[0].end	= pci_resource_end(pci, 0);
131	res[0].name	= "dwc_usb3";
132	res[0].flags	= IORESOURCE_MEM;
133
134	res[1].start	= pci->irq;
135	res[1].name	= "dwc_usb3";
136	res[1].flags	= IORESOURCE_IRQ;
137
138	ret = platform_device_add_resources(dwc3, res, ARRAY_SIZE(res));
139	if (ret) {
140		dev_err(&pci->dev, "couldn't add resources to dwc3 device\n");
141		goto err4;
142	}
143
144	pci_set_drvdata(pci, glue);
145
146	dma_set_coherent_mask(&dwc3->dev, pci->dev.coherent_dma_mask);
147
148	dwc3->dev.dma_mask = pci->dev.dma_mask;
149	dwc3->dev.dma_parms = pci->dev.dma_parms;
150	dwc3->dev.parent = &pci->dev;
151	glue->dwc3	= dwc3;
152
153	ret = platform_device_add(dwc3);
154	if (ret) {
155		dev_err(&pci->dev, "failed to register dwc3 device\n");
156		goto err4;
157	}
158
159	return 0;
160
161err4:
162	pci_set_drvdata(pci, NULL);
163	platform_device_put(dwc3);
164
165err3:
166	dwc3_pci_put_device_id(glue, devid);
167
168err2:
169	pci_disable_device(pci);
170
171err1:
172	kfree(pci);
173
174err0:
175	return ret;
176}
177
178static void __devexit dwc3_pci_remove(struct pci_dev *pci)
179{
180	struct dwc3_pci	*glue = pci_get_drvdata(pci);
181
182	dwc3_pci_put_device_id(glue, glue->dwc3->id);
183	platform_device_unregister(glue->dwc3);
184	pci_set_drvdata(pci, NULL);
185	pci_disable_device(pci);
186	kfree(glue);
187}
188
189static DEFINE_PCI_DEVICE_TABLE(dwc3_pci_id_table) = {
190	{
191		PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
192				PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3),
193	},
194	{  }	/* Terminating Entry */
195};
196MODULE_DEVICE_TABLE(pci, dwc3_pci_id_table);
197
198static struct pci_driver dwc3_pci_driver = {
199	.name		= "dwc3-pci",
200	.id_table	= dwc3_pci_id_table,
201	.probe		= dwc3_pci_probe,
202	.remove		= __devexit_p(dwc3_pci_remove),
203};
204
205MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
206MODULE_LICENSE("Dual BSD/GPL");
207MODULE_DESCRIPTION("DesignWare USB3 PCI Glue Layer");
208
209static int __devinit dwc3_pci_init(void)
210{
211	return pci_register_driver(&dwc3_pci_driver);
212}
213module_init(dwc3_pci_init);
214
215static void __exit dwc3_pci_exit(void)
216{
217	pci_unregister_driver(&dwc3_pci_driver);
218}
219module_exit(dwc3_pci_exit);
220