aw_usbphy.c revision 297627 
1/*-
2 * Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
19 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
21 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
22 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/arm/allwinner/aw_usbphy.c 297627 2016-04-06 23:11:03Z jmcneill $
27 */
28
29/*
30 * Allwinner USB PHY
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: head/sys/arm/allwinner/aw_usbphy.c 297627 2016-04-06 23:11:03Z jmcneill $");
35
36#include <sys/param.h>
37#include <sys/systm.h>
38#include <sys/bus.h>
39#include <sys/rman.h>
40#include <sys/kernel.h>
41#include <sys/module.h>
42#include <sys/gpio.h>
43
44#include <dev/ofw/ofw_bus.h>
45#include <dev/ofw/ofw_bus_subr.h>
46
47#include <dev/extres/clk/clk.h>
48#include <dev/extres/hwreset/hwreset.h>
49#include <dev/extres/regulator/regulator.h>
50
51#define	USBPHY_NUMOFF		3
52
53static struct ofw_compat_data compat_data[] = {
54	{ "allwinner,sun4i-a10-usb-phy",	1 },
55	{ "allwinner,sun5i-a13-usb-phy",	1 },
56	{ "allwinner,sun6i-a31-usb-phy",	1 },
57	{ "allwinner,sun7i-a20-usb-phy",	1 },
58	{ NULL,					0 }
59};
60
61static int
62awusbphy_init(device_t dev)
63{
64	char pname[20];
65	int error, off;
66	regulator_t reg;
67	hwreset_t rst;
68	clk_t clk;
69
70	/* Enable clocks */
71	for (off = 0; clk_get_by_ofw_index(dev, off, &clk) == 0; off++) {
72		error = clk_enable(clk);
73		if (error != 0) {
74			device_printf(dev, "couldn't enable clock %s\n",
75			    clk_get_name(clk));
76			return (error);
77		}
78	}
79
80	/* De-assert resets */
81	for (off = 0; hwreset_get_by_ofw_idx(dev, off, &rst) == 0; off++) {
82		error = hwreset_deassert(rst);
83		if (error != 0) {
84			device_printf(dev, "couldn't de-assert reset %d\n",
85			    off);
86			return (error);
87		}
88	}
89
90	/* Enable regulator(s) */
91	for (off = 0; off < USBPHY_NUMOFF; off++) {
92		snprintf(pname, sizeof(pname), "usb%d_vbus-supply", off);
93		if (regulator_get_by_ofw_property(dev, pname, &reg) != 0)
94			continue;
95		error = regulator_enable(reg);
96		if (error != 0) {
97			device_printf(dev, "couldn't enable regulator %s\n",
98			    pname);
99			return (error);
100		}
101	}
102
103	return (0);
104}
105
106static int
107awusbphy_probe(device_t dev)
108{
109	if (!ofw_bus_status_okay(dev))
110		return (ENXIO);
111
112	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
113		return (ENXIO);
114
115	device_set_desc(dev, "Allwinner USB PHY");
116	return (BUS_PROBE_DEFAULT);
117}
118
119static int
120awusbphy_attach(device_t dev)
121{
122	int error;
123
124	error = awusbphy_init(dev);
125	if (error)
126		device_printf(dev, "failed to initialize USB PHY, error %d\n",
127		    error);
128
129	return (error);
130}
131
132static device_method_t awusbphy_methods[] = {
133	/* Device interface */
134	DEVMETHOD(device_probe,		awusbphy_probe),
135	DEVMETHOD(device_attach,	awusbphy_attach),
136
137	DEVMETHOD_END
138};
139
140static driver_t awusbphy_driver = {
141	"awusbphy",
142	awusbphy_methods,
143	0,
144};
145
146static devclass_t awusbphy_devclass;
147
148DRIVER_MODULE(awusbphy, simplebus, awusbphy_driver, awusbphy_devclass, 0, 0);
149MODULE_VERSION(awusbphy, 1);
150