aw_usbphy.c revision 299688 
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 299688 2016-05-13 18:20:54Z manu $
27 */
28
29/*
30 * Allwinner USB PHY
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: head/sys/arm/allwinner/aw_usbphy.c 299688 2016-05-13 18:20:54Z manu $");
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	{ "allwinner,sun8i-a83t-usb-phy",	1 },
59	{ "allwinner,sun8i-h3-usb-phy",		1 },
60	{ NULL,					0 }
61};
62
63static int
64awusbphy_init(device_t dev)
65{
66	char pname[20];
67	int error, off;
68	regulator_t reg;
69	hwreset_t rst;
70	clk_t clk;
71
72	/* Enable clocks */
73	for (off = 0; clk_get_by_ofw_index(dev, off, &clk) == 0; off++) {
74		error = clk_enable(clk);
75		if (error != 0) {
76			device_printf(dev, "couldn't enable clock %s\n",
77			    clk_get_name(clk));
78			return (error);
79		}
80	}
81
82	/* De-assert resets */
83	for (off = 0; hwreset_get_by_ofw_idx(dev, off, &rst) == 0; off++) {
84		error = hwreset_deassert(rst);
85		if (error != 0) {
86			device_printf(dev, "couldn't de-assert reset %d\n",
87			    off);
88			return (error);
89		}
90	}
91
92	/* Enable regulator(s) */
93	for (off = 0; off < USBPHY_NUMOFF; off++) {
94		snprintf(pname, sizeof(pname), "usb%d_vbus-supply", off);
95		if (regulator_get_by_ofw_property(dev, pname, &reg) != 0)
96			continue;
97		error = regulator_enable(reg);
98		if (error != 0) {
99			device_printf(dev, "couldn't enable regulator %s\n",
100			    pname);
101			return (error);
102		}
103	}
104
105	return (0);
106}
107
108static int
109awusbphy_probe(device_t dev)
110{
111	if (!ofw_bus_status_okay(dev))
112		return (ENXIO);
113
114	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
115		return (ENXIO);
116
117	device_set_desc(dev, "Allwinner USB PHY");
118	return (BUS_PROBE_DEFAULT);
119}
120
121static int
122awusbphy_attach(device_t dev)
123{
124	int error;
125
126	error = awusbphy_init(dev);
127	if (error)
128		device_printf(dev, "failed to initialize USB PHY, error %d\n",
129		    error);
130
131	return (error);
132}
133
134static device_method_t awusbphy_methods[] = {
135	/* Device interface */
136	DEVMETHOD(device_probe,		awusbphy_probe),
137	DEVMETHOD(device_attach,	awusbphy_attach),
138
139	DEVMETHOD_END
140};
141
142static driver_t awusbphy_driver = {
143	"awusbphy",
144	awusbphy_methods,
145	0,
146};
147
148static devclass_t awusbphy_devclass;
149
150DRIVER_MODULE(awusbphy, simplebus, awusbphy_driver, awusbphy_devclass, 0, 0);
151MODULE_VERSION(awusbphy, 1);
152