1 /* $NetBSD: rk3288_usb.c,v 1.1 2021/11/12 22:02:08 jmcneill Exp $ */
2
3 /*-
4 * Copyright (c) 2021 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: rk3288_usb.c,v 1.1 2021/11/12 22:02:08 jmcneill 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 #include <sys/kmem.h>
40
41 #include <dev/fdt/fdtvar.h>
42 #include <dev/fdt/syscon.h>
43
44 #define GRF_UOCn_CON0_SIDDQ __BIT(13)
45
46 static int rk3288_usb_match(device_t, cfdata_t, void *);
47 static void rk3288_usb_attach(device_t, device_t, void *);
48
49 static const struct device_compatible_entry compat_data[] = {
50 { .compat = "rockchip,rk3288-usb-phy" },
51 DEVICE_COMPAT_EOL
52 };
53
54 CFATTACH_DECL_NEW(rk3288_usb, 0,
55 rk3288_usb_match, rk3288_usb_attach, NULL, NULL);
56
57 static int
rk3288_usb_match(device_t parent,cfdata_t cf,void * aux)58 rk3288_usb_match(device_t parent, cfdata_t cf, void *aux)
59 {
60 struct fdt_attach_args * const faa = aux;
61
62 return of_compatible_match(faa->faa_phandle, compat_data);
63 }
64
65 static void
rk3288_usb_attach(device_t parent,device_t self,void * aux)66 rk3288_usb_attach(device_t parent, device_t self, void *aux)
67 {
68 struct fdt_attach_args * const faa = aux;
69 const int phandle = faa->faa_phandle;
70 int child;
71
72 aprint_naive("\n");
73 aprint_normal(": USB PHY\n");
74
75 for (child = OF_child(phandle); child; child = OF_peer(child)) {
76 if (!fdtbus_status_okay(child))
77 continue;
78
79 struct fdt_attach_args cfaa = *faa;
80 cfaa.faa_phandle = child;
81 cfaa.faa_name = fdtbus_get_string(child, "name");
82 cfaa.faa_quiet = false;
83
84 config_found(self, &cfaa, NULL, CFARGS_NONE);
85 }
86 }
87
88 /*
89 * USB PHY
90 */
91
92 static int rk3288_usbphy_match(device_t, cfdata_t, void *);
93 static void rk3288_usbphy_attach(device_t, device_t, void *);
94
95 struct rk3288_usbphy_softc {
96 device_t sc_dev;
97 int sc_phandle;
98 struct syscon *sc_syscon;
99 bus_addr_t sc_reg;
100 };
101
102 CFATTACH_DECL_NEW(rk3288_usbphy, sizeof(struct rk3288_usbphy_softc),
103 rk3288_usbphy_match, rk3288_usbphy_attach, NULL, NULL);
104
105 static void *
rk3288_usbphy_acquire(device_t dev,const void * data,size_t len)106 rk3288_usbphy_acquire(device_t dev, const void *data, size_t len)
107 {
108 struct rk3288_usbphy_softc * const sc = device_private(dev);
109
110 if (len != 0)
111 return NULL;
112
113 return sc;
114 }
115
116 static void
rk3288_usbphy_release(device_t dev,void * priv)117 rk3288_usbphy_release(device_t dev, void *priv)
118 {
119 }
120
121 static int
rk3288_usbphy_enable(device_t dev,void * priv,bool enable)122 rk3288_usbphy_enable(device_t dev, void *priv, bool enable)
123 {
124 struct rk3288_usbphy_softc * const sc = device_private(dev);
125 uint32_t write_mask, write_val;
126
127 write_mask = GRF_UOCn_CON0_SIDDQ << 16;
128 write_val = enable ? 0 : GRF_UOCn_CON0_SIDDQ;
129
130 syscon_lock(sc->sc_syscon);
131 syscon_write_4(sc->sc_syscon, sc->sc_reg, write_mask | write_val);
132 syscon_unlock(sc->sc_syscon);
133
134 return 0;
135 }
136
137 const struct fdtbus_phy_controller_func rk3288_usbphy_funcs = {
138 .acquire = rk3288_usbphy_acquire,
139 .release = rk3288_usbphy_release,
140 .enable = rk3288_usbphy_enable,
141 };
142
143 static int
rk3288_usbphy_match(device_t parent,cfdata_t cf,void * aux)144 rk3288_usbphy_match(device_t parent, cfdata_t cf, void *aux)
145 {
146 return 1;
147 }
148
149 static void
rk3288_usbphy_attach(device_t parent,device_t self,void * aux)150 rk3288_usbphy_attach(device_t parent, device_t self, void *aux)
151 {
152 struct rk3288_usbphy_softc * const sc = device_private(self);
153 struct fdt_attach_args * const faa = aux;
154 const int phandle = faa->faa_phandle;
155 struct fdtbus_reset *rst;
156
157 sc->sc_dev = self;
158 sc->sc_phandle = phandle;
159 sc->sc_syscon = fdtbus_syscon_lookup(OF_parent(OF_parent(phandle)));
160 if (sc->sc_syscon == NULL) {
161 aprint_error(": couldn't find syscon\n");
162 return;
163 }
164 if (fdtbus_get_reg(phandle, 0, &sc->sc_reg, NULL) != 0) {
165 aprint_error(": couldn't find registers\n");
166 return;
167 }
168
169 rst = fdtbus_reset_get(phandle, "phy-reset");
170 if (rst == NULL || fdtbus_reset_deassert(rst) != 0) {
171 aprint_error(": couldn't de-assert reset\n");
172 return;
173 }
174 if (fdtbus_clock_enable(phandle, "phyclk", true) != 0) {
175 aprint_error(": couildn't enable clock\n");
176 return;
177 }
178
179 aprint_naive("\n");
180 aprint_normal(": USB port\n");
181
182 fdtbus_register_phy_controller(self, phandle, &rk3288_usbphy_funcs);
183 }
184