1/*	$NetBSD: imx6_usbphy.c,v 1.3 2023/05/04 13:29:33 bouyer Exp $	*/
2
3/*-
4 * Copyright (c) 2019 Genetec Corporation.  All rights reserved.
5 * Written by Hashimoto Kenichi for Genetec Corporation.
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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(1, "$NetBSD: imx6_usbphy.c,v 1.3 2023/05/04 13:29:33 bouyer Exp $");
31
32#include "opt_fdt.h"
33
34#include "locators.h"
35#include "ohci.h"
36#include "ehci.h"
37
38#include <sys/param.h>
39#include <sys/bus.h>
40#include <sys/device.h>
41
42#include <arm/nxp/imx6_usbphyreg.h>
43
44#include <dev/fdt/fdtvar.h>
45
46struct imx6_usbphy_softc {
47	device_t sc_dev;
48
49	bus_space_tag_t sc_iot;
50	bus_space_handle_t sc_ioh;
51
52	struct clk *sc_clk;
53};
54
55static int imx6_usbphy_match(device_t, cfdata_t, void *);
56static void imx6_usbphy_attach(device_t, device_t, void *);
57
58static int imx6_usbphy_init_clocks(device_t);
59static int imx6_usbphy_enable(device_t, void *, bool);
60
61CFATTACH_DECL_NEW(imxusbphy, sizeof(struct imx6_usbphy_softc),
62    imx6_usbphy_match, imx6_usbphy_attach, NULL, NULL);
63
64static const struct device_compatible_entry compat_data[] = {
65	{ .compat = "fsl,imx6q-usbphy" },
66	{ .compat = "fsl,imx6sx-usbphy" },
67	DEVICE_COMPAT_EOL
68};
69
70static int
71imx6_usbphy_match(device_t parent, cfdata_t cf, void *aux)
72{
73	struct fdt_attach_args * const faa = aux;
74
75	return of_compatible_match(faa->faa_phandle, compat_data);
76}
77
78static void
79imx6_usbphy_attach(device_t parent, device_t self, void *aux)
80{
81	struct imx6_usbphy_softc *sc = device_private(self);
82	struct fdt_attach_args * const faa = aux;
83	const int phandle = faa->faa_phandle;
84	bus_space_tag_t bst = faa->faa_bst;
85	bus_space_handle_t bsh;
86	bus_addr_t addr;
87	bus_size_t size;
88	int error;
89
90	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
91		aprint_error(": couldn't get iomux registers\n");
92		return;
93	}
94
95	error = bus_space_map(bst, addr, size, 0, &bsh);
96	if (error) {
97		aprint_error(": couldn't map %#" PRIxBUSADDR ": %d", addr, error);
98		return;
99	}
100
101	sc->sc_clk = fdtbus_clock_get_index(phandle, 0);
102	if (sc->sc_clk == NULL) {
103		aprint_error(": couldn't get clock\n");
104		return;
105	}
106
107	sc->sc_dev = self;
108	sc->sc_iot = bst;
109	sc->sc_ioh = bsh;
110
111	aprint_naive("\n");
112	aprint_normal(": USB PHY\n");
113
114	imx6_usbphy_init_clocks(self);
115	imx6_usbphy_enable(self, NULL, true);
116}
117
118static int
119imx6_usbphy_init_clocks(device_t dev)
120{
121	struct imx6_usbphy_softc * const sc = device_private(dev);
122	int error;
123
124	error = clk_enable(sc->sc_clk);
125	if (error) {
126		aprint_error_dev(sc->sc_dev, "couldn't enable: %d\n", error);
127		return error;
128	}
129
130	return 0;
131}
132
133#define	USBPHY_READ(sc, reg)						      \
134	bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg))
135#define	USBPHY_WRITE(sc, reg, val)					      \
136	bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
137
138static int
139imx6_usbphy_enable(device_t dev, void *priv, bool enable)
140{
141	struct imx6_usbphy_softc * const sc = device_private(dev);
142
143	/* USBPHY enable */
144	USBPHY_WRITE(sc, USBPHY_CTRL, USBPHY_CTRL_CLKGATE);
145
146	/* do reset */
147	USBPHY_WRITE(sc, USBPHY_CTRL_SET, USBPHY_CTRL_SFTRST);
148	delay(100);
149
150	/* clear reset, and run clocks */
151	USBPHY_WRITE(sc, USBPHY_CTRL_CLR,
152	    USBPHY_CTRL_SFTRST | USBPHY_CTRL_CLKGATE);
153	delay(100);
154
155	/* power on */
156	USBPHY_WRITE(sc, USBPHY_PWD, 0);
157
158	/* UTMI+Level2, Level3 */
159	USBPHY_WRITE(sc, USBPHY_CTRL_SET,
160	    USBPHY_CTRL_ENUTMILEVEL2 | USBPHY_CTRL_ENUTMILEVEL3);
161
162	return 0;
163}
164
165