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)
55 #define A10_ROOT_KEY_OFF 0x0
56 #define A83T_ROOT_KEY_OFF SID_SRAM
58 #define ROOT_KEY_SIZE 4
66 static struct ofw_compat_data compat_data[] = {
67 { "allwinner,sun4i-a10-sid", A10_SID},
68 { "allwinner,sun7i-a20-sid", A20_SID},
69 { "allwinner,sun8i-a83t-sid", A83T_SID},
76 bus_size_t root_key_off;
79 static struct aw_sid_softc *aw_sid_sc;
81 static struct resource_spec aw_sid_spec[] = {
82 { SYS_RES_MEMORY, 0, RF_ACTIVE },
90 #define RD4(sc, reg) bus_read_4((sc)->res, (reg))
91 #define WR4(sc, reg, val) bus_write_4((sc)->res, (reg), (val))
93 static int aw_sid_sysctl(SYSCTL_HANDLER_ARGS);
96 aw_sid_probe(device_t dev)
98 if (!ofw_bus_status_okay(dev))
101 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
104 device_set_desc(dev, "Allwinner Secure ID Controller");
105 return (BUS_PROBE_DEFAULT);
109 aw_sid_attach(device_t dev)
111 struct aw_sid_softc *sc;
113 sc = device_get_softc(dev);
115 if (bus_alloc_resources(dev, aw_sid_spec, &sc->res) != 0) {
116 device_printf(dev, "cannot allocate resources for device\n");
122 sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
125 sc->root_key_off = A83T_ROOT_KEY_OFF;
128 sc->root_key_off = A10_ROOT_KEY_OFF;
132 SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
133 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
135 CTLTYPE_STRING | CTLFLAG_RD,
136 dev, AW_SID_ROOT_KEY, aw_sid_sysctl, "A", "Root Key");
142 aw_sid_read_tscalib(uint32_t *calib0, uint32_t *calib1)
144 struct aw_sid_softc *sc;
149 if (sc->type != A83T_SID)
152 *calib0 = RD4(sc, SID_THERMAL_CALIB0);
153 *calib1 = RD4(sc, SID_THERMAL_CALIB1);
159 aw_sid_get_rootkey(u_char *out)
161 struct aw_sid_softc *sc;
169 for (i = 0; i < ROOT_KEY_SIZE ; i++) {
170 tmp = RD4(aw_sid_sc, aw_sid_sc->root_key_off + (i * 4));
171 be32enc(&out[i * 4], tmp);
178 aw_sid_sysctl(SYSCTL_HANDLER_ARGS)
180 enum sid_keys key = arg2;
184 if (key != AW_SID_ROOT_KEY)
187 if (aw_sid_get_rootkey(rootkey) != 0)
189 snprintf(out, sizeof(out),
190 "%16D", rootkey, "");
192 return sysctl_handle_string(oidp, out, sizeof(out), req);
195 static device_method_t aw_sid_methods[] = {
196 /* Device interface */
197 DEVMETHOD(device_probe, aw_sid_probe),
198 DEVMETHOD(device_attach, aw_sid_attach),
203 static driver_t aw_sid_driver = {
206 sizeof(struct aw_sid_softc),
209 static devclass_t aw_sid_devclass;
211 EARLY_DRIVER_MODULE(aw_sid, simplebus, aw_sid_driver, aw_sid_devclass, 0, 0,
212 BUS_PASS_RESOURCE + BUS_PASS_ORDER_FIRST);
213 MODULE_VERSION(aw_sid, 1);