2 * Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
19 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
21 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
22 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * Allwinner secure ID controller
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/endian.h>
37 #include <sys/param.h>
38 #include <sys/systm.h>
41 #include <sys/kernel.h>
42 #include <sys/module.h>
43 #include <sys/sysctl.h>
44 #include <machine/bus.h>
46 #include <dev/ofw/ofw_bus.h>
47 #include <dev/ofw/ofw_bus_subr.h>
49 #include <arm/allwinner/aw_sid.h>
51 #define SID_SRAM 0x200
52 #define SID_THERMAL_CALIB0 (SID_SRAM + 0x34)
53 #define SID_THERMAL_CALIB1 (SID_SRAM + 0x38)
61 static struct ofw_compat_data compat_data[] = {
62 { "allwinner,sun4i-a10-sid", A10_SID},
63 { "allwinner,sun7i-a20-sid", A20_SID},
64 { "allwinner,sun8i-a83t-sid", A83T_SID},
73 static struct aw_sid_softc *aw_sid_sc;
75 static struct resource_spec aw_sid_spec[] = {
76 { SYS_RES_MEMORY, 0, RF_ACTIVE },
84 #define ROOT_KEY_OFF 0x0
85 #define ROOT_KEY_SIZE 4
87 #define RD4(sc, reg) bus_read_4((sc)->res, (reg))
88 #define WR4(sc, reg, val) bus_write_4((sc)->res, (reg), (val))
90 static int aw_sid_sysctl(SYSCTL_HANDLER_ARGS);
93 aw_sid_probe(device_t dev)
95 if (!ofw_bus_status_okay(dev))
98 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
101 device_set_desc(dev, "Allwinner Secure ID Controller");
102 return (BUS_PROBE_DEFAULT);
106 aw_sid_attach(device_t dev)
108 struct aw_sid_softc *sc;
110 sc = device_get_softc(dev);
112 if (bus_alloc_resources(dev, aw_sid_spec, &sc->res) != 0) {
113 device_printf(dev, "cannot allocate resources for device\n");
119 sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
123 SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
124 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
126 CTLTYPE_STRING | CTLFLAG_RD,
127 dev, AW_SID_ROOT_KEY, aw_sid_sysctl, "A", "Root Key");
136 aw_sid_read_tscalib(uint32_t *calib0, uint32_t *calib1)
138 struct aw_sid_softc *sc;
143 if (sc->type != A83T_SID)
146 *calib0 = RD4(sc, SID_THERMAL_CALIB0);
147 *calib1 = RD4(sc, SID_THERMAL_CALIB1);
153 aw_sid_get_rootkey(u_char *out)
155 struct aw_sid_softc *sc;
162 if (sc->type != A10_SID && sc->type != A20_SID)
165 for (i = 0; i < ROOT_KEY_SIZE ; i++) {
166 tmp = RD4(aw_sid_sc, ROOT_KEY_OFF + (i * 4));
167 be32enc(&out[i * 4], tmp);
174 aw_sid_sysctl(SYSCTL_HANDLER_ARGS)
176 enum sid_keys key = arg2;
180 if (key != AW_SID_ROOT_KEY)
183 if (aw_sid_get_rootkey(rootkey) != 0)
185 snprintf(out, sizeof(out),
186 "%16D", rootkey, "");
188 return sysctl_handle_string(oidp, out, sizeof(out), req);
191 static device_method_t aw_sid_methods[] = {
192 /* Device interface */
193 DEVMETHOD(device_probe, aw_sid_probe),
194 DEVMETHOD(device_attach, aw_sid_attach),
199 static driver_t aw_sid_driver = {
202 sizeof(struct aw_sid_softc),
205 static devclass_t aw_sid_devclass;
207 EARLY_DRIVER_MODULE(aw_sid, simplebus, aw_sid_driver, aw_sid_devclass, 0, 0,
208 BUS_PASS_RESOURCE + BUS_PASS_ORDER_FIRST);
209 MODULE_VERSION(aw_sid, 1);