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>
43 #include <sys/mutex.h>
44 #include <sys/module.h>
45 #include <sys/sysctl.h>
46 #include <machine/bus.h>
48 #include <dev/ofw/ofw_bus.h>
49 #include <dev/ofw/ofw_bus_subr.h>
51 #include <arm/allwinner/aw_sid.h>
54 #define SID_PRCTL 0x40
55 #define SID_PRCTL_OFFSET_MASK 0xff
56 #define SID_PRCTL_OFFSET(n) (((n) & SID_PRCTL_OFFSET_MASK) << 16)
57 #define SID_PRCTL_LOCK (0xac << 8)
58 #define SID_PRCTL_READ (0x01 << 1)
59 #define SID_PRCTL_WRITE (0x01 << 0)
60 #define SID_PRKEY 0x50
61 #define SID_RDKEY 0x60
63 #define SID_SRAM 0x200
64 /* Offsets into efuse space, for convenience */
65 #define SID_THERMAL_CALIB0_OFF (0x34)
66 #define SID_THERMAL_CALIB1_OFF (0x38)
67 #define SID_THERMAL_CALIB0 (SID_SRAM + SID_THERMAL_CALIB0_OFF)
68 #define SID_THERMAL_CALIB1 (SID_SRAM + SID_THERMAL_CALIB1_OFF)
70 #define ROOT_KEY_SIZE 4
73 bus_size_t efuse_size;
74 bus_size_t rootkey_offset;
77 bool requires_prctl_read;
80 static const struct aw_sid_conf a10_conf = {
85 static const struct aw_sid_conf a20_conf = {
90 static const struct aw_sid_conf a64_conf = {
92 .rootkey_offset = SID_SRAM,
97 static const struct aw_sid_conf a83t_conf = {
99 .rootkey_offset = SID_SRAM,
104 static const struct aw_sid_conf h3_conf = {
106 .rootkey_offset = SID_SRAM,
109 .requires_prctl_read = true,
112 static struct ofw_compat_data compat_data[] = {
113 { "allwinner,sun4i-a10-sid", (uintptr_t)&a10_conf},
114 { "allwinner,sun7i-a20-sid", (uintptr_t)&a20_conf},
115 { "allwinner,sun50i-a64-sid", (uintptr_t)&a64_conf},
116 { "allwinner,sun8i-a83t-sid", (uintptr_t)&a83t_conf},
117 { "allwinner,sun8i-h3-sid", (uintptr_t)&h3_conf},
121 struct aw_sid_softc {
123 struct resource *res;
124 struct aw_sid_conf *sid_conf;
125 struct mtx prctl_mtx;
128 static struct aw_sid_softc *aw_sid_sc;
130 static struct resource_spec aw_sid_spec[] = {
131 { SYS_RES_MEMORY, 0, RF_ACTIVE },
139 #define RD4(sc, reg) bus_read_4((sc)->res, (reg))
140 #define WR4(sc, reg, val) bus_write_4((sc)->res, (reg), (val))
142 #define PRCTL_RD4(sc, reg, val) aw_sid_prctl_read((sc)->sid_dev, (reg), (val))
144 static int aw_sid_sysctl(SYSCTL_HANDLER_ARGS);
145 static int aw_sid_prctl_read(device_t dev, bus_size_t offset, uint32_t *val);
149 * offset here is offset into efuse space, rather than offset into sid register
150 * space. This form of read is only an option for newer SoC: A83t, H3, A64
153 aw_sid_prctl_read(device_t dev, bus_size_t offset, uint32_t *val)
155 struct aw_sid_softc *sc;
158 sc = device_get_softc(dev);
159 if (!sc->sid_conf->has_prctl)
162 mtx_lock(&sc->prctl_mtx);
163 readval = SID_PRCTL_OFFSET(offset) | SID_PRCTL_LOCK | SID_PRCTL_READ;
164 WR4(sc, SID_PRCTL, readval);
165 /* Read bit will be cleared once read has concluded */
166 while (RD4(sc, SID_PRCTL) & SID_PRCTL_READ)
168 readval = RD4(sc, SID_RDKEY);
169 mtx_unlock(&sc->prctl_mtx);
176 aw_sid_probe(device_t dev)
178 if (!ofw_bus_status_okay(dev))
181 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
184 device_set_desc(dev, "Allwinner Secure ID Controller");
185 return (BUS_PROBE_DEFAULT);
189 aw_sid_attach(device_t dev)
191 struct aw_sid_softc *sc;
193 sc = device_get_softc(dev);
196 if (bus_alloc_resources(dev, aw_sid_spec, &sc->res) != 0) {
197 device_printf(dev, "cannot allocate resources for device\n");
201 mtx_init(&sc->prctl_mtx, device_get_nameunit(dev), NULL, MTX_DEF);
202 sc->sid_conf = (struct aw_sid_conf *)ofw_bus_search_compatible(dev, compat_data)->ocd_data;
205 SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
206 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
208 CTLTYPE_STRING | CTLFLAG_RD,
209 dev, AW_SID_ROOT_KEY, aw_sid_sysctl, "A", "Root Key");
215 aw_sid_read_tscalib(uint32_t *calib0, uint32_t *calib1)
217 struct aw_sid_softc *sc;
222 if (!sc->sid_conf->has_thermal)
225 if (sc->sid_conf->requires_prctl_read) {
226 PRCTL_RD4(sc, SID_THERMAL_CALIB0_OFF, calib0);
227 PRCTL_RD4(sc, SID_THERMAL_CALIB1_OFF, calib1);
229 *calib0 = RD4(sc, SID_THERMAL_CALIB0);
230 *calib1 = RD4(sc, SID_THERMAL_CALIB1);
237 aw_sid_get_rootkey(u_char *out)
239 struct aw_sid_softc *sc;
241 bus_size_t root_key_off;
247 root_key_off = aw_sid_sc->sid_conf->rootkey_offset;
248 for (i = 0; i < ROOT_KEY_SIZE ; i++) {
249 if (sc->sid_conf->requires_prctl_read)
250 PRCTL_RD4(sc, (i * 4), &tmp);
252 tmp = RD4(aw_sid_sc, root_key_off + (i * 4));
253 be32enc(&out[i * 4], tmp);
260 aw_sid_sysctl(SYSCTL_HANDLER_ARGS)
262 enum sid_keys key = arg2;
266 if (key != AW_SID_ROOT_KEY)
269 if (aw_sid_get_rootkey(rootkey) != 0)
271 snprintf(out, sizeof(out),
272 "%16D", rootkey, "");
274 return sysctl_handle_string(oidp, out, sizeof(out), req);
277 static device_method_t aw_sid_methods[] = {
278 /* Device interface */
279 DEVMETHOD(device_probe, aw_sid_probe),
280 DEVMETHOD(device_attach, aw_sid_attach),
285 static driver_t aw_sid_driver = {
288 sizeof(struct aw_sid_softc),
291 static devclass_t aw_sid_devclass;
293 EARLY_DRIVER_MODULE(aw_sid, simplebus, aw_sid_driver, aw_sid_devclass, 0, 0,
294 BUS_PASS_RESOURCE + BUS_PASS_ORDER_FIRST);
295 MODULE_VERSION(aw_sid, 1);