imx6_usbphy.c revision 1.2 
1/*	$NetBSD: imx6_usbphy.c,v 1.2 2021/01/27 03:10:20 thorpej 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 1.2 2021/01/27 03:10:20 thorpej 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	DEVICE_COMPAT_EOL
67};
68
69static int
70imx6_usbphy_match(device_t parent, cfdata_t cf, void *aux)
71{
72	struct fdt_attach_args * const faa = aux;
73
74	return of_compatible_match(faa->faa_phandle, compat_data);
75}
76
77static void
78imx6_usbphy_attach(device_t parent, device_t self, void *aux)
79{
80	struct imx6_usbphy_softc *sc = device_private(self);
81	struct fdt_attach_args * const faa = aux;
82	const int phandle = faa->faa_phandle;
83	bus_space_tag_t bst = faa->faa_bst;
84	bus_space_handle_t bsh;
85	bus_addr_t addr;
86	bus_size_t size;
87	int error;
88
89	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
90		aprint_error(": couldn't get iomux registers\n");
91		return;
92	}
93
94	error = bus_space_map(bst, addr, size, 0, &bsh);
95	if (error) {
96		aprint_error(": couldn't map %#" PRIxBUSADDR ": %d", addr, error);
97		return;
98	}
99
100	sc->sc_clk = fdtbus_clock_get_index(phandle, 0);
101	if (sc->sc_clk == NULL) {
102		aprint_error(": couldn't get clock\n");
103		return;
104	}
105
106	sc->sc_dev = self;
107	sc->sc_iot = bst;
108	sc->sc_ioh = bsh;
109
110	aprint_naive("\n");
111	aprint_normal(": USB PHY\n");
112
113	imx6_usbphy_init_clocks(self);
114	imx6_usbphy_enable(self, NULL, true);
115}
116
117static int
118imx6_usbphy_init_clocks(device_t dev)
119{
120	struct imx6_usbphy_softc * const sc = device_private(dev);
121	int error;
122
123	error = clk_enable(sc->sc_clk);
124	if (error) {
125		aprint_error_dev(sc->sc_dev, "couldn't enable: %d\n", error);
126		return error;
127	}
128
129	return 0;
130}
131
132#define	USBPHY_READ(sc, reg)						      \
133	bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg))
134#define	USBPHY_WRITE(sc, reg, val)					      \
135	bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
136
137static int
138imx6_usbphy_enable(device_t dev, void *priv, bool enable)
139{
140	struct imx6_usbphy_softc * const sc = device_private(dev);
141
142	/* USBPHY enable */
143	USBPHY_WRITE(sc, USBPHY_CTRL, USBPHY_CTRL_CLKGATE);
144
145	/* do reset */
146	USBPHY_WRITE(sc, USBPHY_CTRL_SET, USBPHY_CTRL_SFTRST);
147	delay(100);
148
149	/* clear reset, and run clocks */
150	USBPHY_WRITE(sc, USBPHY_CTRL_CLR,
151	    USBPHY_CTRL_SFTRST | USBPHY_CTRL_CLKGATE);
152	delay(100);
153
154	/* power on */
155	USBPHY_WRITE(sc, USBPHY_PWD, 0);
156
157	/* UTMI+Level2, Level3 */
158	USBPHY_WRITE(sc, USBPHY_CTRL_SET,
159	    USBPHY_CTRL_ENUTMILEVEL2 | USBPHY_CTRL_ENUTMILEVEL3);
160
161	return 0;
162}
163
164