1/* $NetBSD: usbnopphy.c,v 1.2 2021/01/27 03:10:21 thorpej Exp $ */
2
3/*-
4 * Copyright (c) 2019 Jared McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30
31__KERNEL_RCSID(0, "$NetBSD: usbnopphy.c,v 1.2 2021/01/27 03:10:21 thorpej Exp $");
32
33#include <sys/param.h>
34#include <sys/bus.h>
35#include <sys/device.h>
36#include <sys/intr.h>
37#include <sys/systm.h>
38#include <sys/time.h>
39
40#include <dev/fdt/fdtvar.h>
41
42static int usbnopphy_match(device_t, cfdata_t, void *);
43static void usbnopphy_attach(device_t, device_t, void *);
44
45static const struct device_compatible_entry compat_data[] = {
46	{ .compat = "usb-nop-xceiv" },
47	DEVICE_COMPAT_EOL
48};
49
50struct usbnopphy_softc {
51	device_t		sc_dev;
52
53	struct clk		*sc_clk;
54	struct fdtbus_regulator *sc_reg;
55	struct fdtbus_gpio_pin	*sc_pin_reset;
56	struct fdtbus_gpio_pin	*sc_pin_vbus_det;
57};
58
59CFATTACH_DECL_NEW(usbnopphy, sizeof(struct usbnopphy_softc),
60	usbnopphy_match, usbnopphy_attach, NULL, NULL);
61
62static void *
63usbnopphy_acquire(device_t dev, const void *data, size_t len)
64{
65	struct usbnopphy_softc * const sc = device_private(dev);
66
67	return sc;
68}
69
70static void
71usbnopphy_release(device_t dev, void *priv)
72{
73}
74
75static int
76usbnopphy_enable(device_t dev, void *priv, bool enable)
77{
78	struct usbnopphy_softc * const sc = device_private(dev);
79	int error;
80
81	if (enable) {
82		if (sc->sc_reg != NULL) {
83			error = fdtbus_regulator_enable(sc->sc_reg);
84			if (error != 0)
85				return error;
86		}
87		if (sc->sc_clk != NULL) {
88			error = clk_enable(sc->sc_clk);
89			if (error != 0)
90				return error;
91		}
92		if (sc->sc_pin_reset != NULL) {
93			fdtbus_gpio_write(sc->sc_pin_reset, 1);
94			delay(20000);
95			fdtbus_gpio_write(sc->sc_pin_reset, 0);
96		}
97	} else {
98		if (sc->sc_pin_reset != NULL)
99			fdtbus_gpio_write(sc->sc_pin_reset, 1);
100		if (sc->sc_reg != NULL)
101			fdtbus_regulator_disable(sc->sc_reg);
102		if (sc->sc_clk != NULL)
103			clk_disable(sc->sc_clk);
104	}
105
106	return 0;
107}
108
109const struct fdtbus_phy_controller_func usbnopphy_funcs = {
110	.acquire = usbnopphy_acquire,
111	.release = usbnopphy_release,
112	.enable = usbnopphy_enable,
113};
114
115static int
116usbnopphy_match(device_t parent, cfdata_t cf, void *aux)
117{
118	struct fdt_attach_args * const faa = aux;
119
120	return of_compatible_match(faa->faa_phandle, compat_data);
121}
122
123static void
124usbnopphy_attach(device_t parent, device_t self, void *aux)
125{
126	struct usbnopphy_softc * const sc = device_private(self);
127	struct fdt_attach_args * const faa = aux;
128	const int phandle = faa->faa_phandle;
129
130	sc->sc_dev = self;
131
132	sc->sc_reg = fdtbus_regulator_acquire(phandle, "vbus-regulator");
133	sc->sc_clk = fdtbus_clock_get(phandle, "main_clk");
134	sc->sc_pin_reset = fdtbus_gpio_acquire(phandle, "reset-gpios", GPIO_PIN_OUTPUT);
135
136	aprint_naive("\n");
137	aprint_normal(": USB PHY\n");
138
139	fdtbus_register_phy_controller(self, phandle, &usbnopphy_funcs);
140}
141