1 /* $NetBSD: mesongxl_usb2phy.c,v 1.2 2021/01/27 03:10:18 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: mesongxl_usb2phy.c,v 1.2 2021/01/27 03:10:18 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
42 #define USB2PHY_REG0 0x00
43 #define REG0_POWER_ON_RESET __BIT(22)
44 #define REG0_ID_PULLUP __BIT(13)
45 #define REG0_DP_PULLDOWN __BIT(6)
46 #define REG0_DM_PULLDOWN __BIT(5)
47
48 static int mesongxl_usb2phy_match(device_t, cfdata_t, void *);
49 static void mesongxl_usb2phy_attach(device_t, device_t, void *);
50
51 static const struct device_compatible_entry compat_data[] = {
52 { .compat = "amlogic,meson-gxl-usb2-phy" },
53 DEVICE_COMPAT_EOL
54 };
55
56 struct mesongxl_usb2phy_softc {
57 device_t sc_dev;
58 bus_space_tag_t sc_bst;
59 bus_space_handle_t sc_bsh;
60 int sc_phandle;
61 struct clk *sc_clk;
62 struct fdtbus_reset *sc_rst;
63 struct fdtbus_regulator *sc_supply;
64 };
65
66 #define PHY_READ(sc, reg) \
67 bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
68 #define PHY_WRITE(sc, reg, val) \
69 bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
70
71 CFATTACH_DECL_NEW(mesongxl_usb2phy, sizeof(struct mesongxl_usb2phy_softc),
72 mesongxl_usb2phy_match, mesongxl_usb2phy_attach, NULL, NULL);
73
74 static void *
mesongxl_usb2phy_acquire(device_t dev,const void * data,size_t len)75 mesongxl_usb2phy_acquire(device_t dev, const void *data, size_t len)
76 {
77 if (len != 0)
78 return NULL;
79
80 return (void *)(uintptr_t)1;
81 }
82
83 static void
mesongxl_usb2phy_release(device_t dev,void * priv)84 mesongxl_usb2phy_release(device_t dev, void *priv)
85 {
86 }
87
88 static int
mesongxl_usb2phy_enable(device_t dev,void * priv,bool enable)89 mesongxl_usb2phy_enable(device_t dev, void *priv, bool enable)
90 {
91 struct mesongxl_usb2phy_softc * const sc = device_private(dev);
92 uint32_t val;
93
94 if (enable) {
95 /* Power on PHY */
96 val = PHY_READ(sc, USB2PHY_REG0);
97 val &= ~REG0_POWER_ON_RESET;
98 PHY_WRITE(sc, USB2PHY_REG0, val);
99
100 /* Configure PHY for host mode */
101 val = PHY_READ(sc, USB2PHY_REG0);
102 val |= REG0_DM_PULLDOWN;
103 val |= REG0_DP_PULLDOWN;
104 val &= ~REG0_ID_PULLUP;
105 PHY_WRITE(sc, USB2PHY_REG0, val);
106
107 /* Reset the PHY */
108 val = PHY_READ(sc, USB2PHY_REG0);
109 val |= REG0_POWER_ON_RESET;
110 PHY_WRITE(sc, USB2PHY_REG0, val);
111 delay(500);
112 val = PHY_READ(sc, USB2PHY_REG0);
113 val &= ~REG0_POWER_ON_RESET;
114 PHY_WRITE(sc, USB2PHY_REG0, val);
115 delay(500);
116
117 if (sc->sc_supply != NULL) {
118 if (fdtbus_regulator_enable(sc->sc_supply) != 0)
119 aprint_error(": couldn't enable supply\n");
120 }
121 } else {
122 /* Power off PHY */
123 val = PHY_READ(sc, USB2PHY_REG0);
124 val |= REG0_POWER_ON_RESET;
125 PHY_WRITE(sc, USB2PHY_REG0, val);
126 }
127
128 return 0;
129 }
130
131 const struct fdtbus_phy_controller_func mesongxl_usb2phy_funcs = {
132 .acquire = mesongxl_usb2phy_acquire,
133 .release = mesongxl_usb2phy_release,
134 .enable = mesongxl_usb2phy_enable,
135 };
136
137 static int
mesongxl_usb2phy_match(device_t parent,cfdata_t cf,void * aux)138 mesongxl_usb2phy_match(device_t parent, cfdata_t cf, void *aux)
139 {
140 struct fdt_attach_args * const faa = aux;
141
142 return of_compatible_match(faa->faa_phandle, compat_data);
143 }
144
145 static void
mesongxl_usb2phy_attach(device_t parent,device_t self,void * aux)146 mesongxl_usb2phy_attach(device_t parent, device_t self, void *aux)
147 {
148 struct mesongxl_usb2phy_softc * const sc = device_private(self);
149 struct fdt_attach_args * const faa = aux;
150 const int phandle = faa->faa_phandle;
151 bus_addr_t addr;
152 bus_size_t size;
153
154 sc->sc_dev = self;
155 sc->sc_bst = faa->faa_bst;
156 sc->sc_phandle = phandle;
157
158 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
159 aprint_error(": couldn't get registers\n");
160 return;
161 }
162 if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) {
163 aprint_error(": couldn't map registers\n");
164 return;
165 }
166
167 sc->sc_clk = fdtbus_clock_get_index(phandle, 0);
168 if (sc->sc_clk == NULL) {
169 aprint_error(": couldn't get clock\n");
170 return;
171 }
172 sc->sc_rst = fdtbus_reset_get_index(phandle, 0);
173
174 if (sc->sc_rst != NULL) {
175 if (fdtbus_reset_deassert(sc->sc_rst) != 0) {
176 aprint_error(": couldn't de-assert reset\n");
177 return;
178 }
179 }
180 if (clk_enable(sc->sc_clk) != 0) {
181 aprint_error(": couldn't enable clock\n");
182 return;
183 }
184
185 sc->sc_supply = fdtbus_regulator_acquire(phandle, "phy-supply");
186
187 aprint_naive("\n");
188 aprint_normal(": USB2 PHY\n");
189
190 fdtbus_register_phy_controller(self, phandle, &mesongxl_usb2phy_funcs);
191 }
192