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
46 struct 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
55 static int imx6_usbphy_match(device_t, cfdata_t, void *);
56 static void imx6_usbphy_attach(device_t, device_t, void *);
57
58 static int imx6_usbphy_init_clocks(device_t);
59 static int imx6_usbphy_enable(device_t, void *, bool);
60
61 CFATTACH_DECL_NEW(imxusbphy, sizeof(struct imx6_usbphy_softc),
62 imx6_usbphy_match, imx6_usbphy_attach, NULL, NULL);
63
64 static const struct device_compatible_entry compat_data[] = {
65 { .compat = "fsl,imx6q-usbphy" },
66 { .compat = "fsl,imx6sx-usbphy" },
67 DEVICE_COMPAT_EOL
68 };
69
70 static int
imx6_usbphy_match(device_t parent,cfdata_t cf,void * aux)71 imx6_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
78 static void
imx6_usbphy_attach(device_t parent,device_t self,void * aux)79 imx6_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
118 static int
imx6_usbphy_init_clocks(device_t dev)119 imx6_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
138 static int
imx6_usbphy_enable(device_t dev,void * priv,bool enable)139 imx6_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