1 /*- 2 * Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 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. 13 * 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 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 /* 30 * Allwinner secure ID controller 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/endian.h> 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/bus.h> 40 #include <sys/rman.h> 41 #include <sys/kernel.h> 42 #include <sys/module.h> 43 #include <sys/sysctl.h> 44 #include <machine/bus.h> 45 46 #include <dev/ofw/ofw_bus.h> 47 #include <dev/ofw/ofw_bus_subr.h> 48 49 #include <arm/allwinner/aw_sid.h> 50 51 #define SID_SRAM 0x200 52 #define SID_THERMAL_CALIB0 (SID_SRAM + 0x34) 53 #define SID_THERMAL_CALIB1 (SID_SRAM + 0x38) 54 55 #define ROOT_KEY_SIZE 4 56 57 struct aw_sid_conf { 58 bus_size_t rootkey_offset; 59 bool has_thermal; 60 }; 61 62 static const struct aw_sid_conf a10_conf = { 63 .rootkey_offset = 0, 64 }; 65 66 static const struct aw_sid_conf a20_conf = { 67 .rootkey_offset = 0, 68 }; 69 70 static const struct aw_sid_conf a64_conf = { 71 .rootkey_offset = SID_SRAM, 72 .has_thermal = true, 73 }; 74 75 static const struct aw_sid_conf a83t_conf = { 76 .rootkey_offset = SID_SRAM, 77 .has_thermal = true, 78 }; 79 80 static struct ofw_compat_data compat_data[] = { 81 { "allwinner,sun4i-a10-sid", (uintptr_t)&a10_conf}, 82 { "allwinner,sun7i-a20-sid", (uintptr_t)&a20_conf}, 83 { "allwinner,sun50i-a64-sid", (uintptr_t)&a64_conf}, 84 { "allwinner,sun8i-a83t-sid", (uintptr_t)&a83t_conf}, 85 { NULL, 0 } 86 }; 87 88 struct aw_sid_softc { 89 struct resource *res; 90 struct aw_sid_conf *sid_conf; 91 }; 92 93 static struct aw_sid_softc *aw_sid_sc; 94 95 static struct resource_spec aw_sid_spec[] = { 96 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 97 { -1, 0 } 98 }; 99 100 enum sid_keys { 101 AW_SID_ROOT_KEY, 102 }; 103 104 #define RD4(sc, reg) bus_read_4((sc)->res, (reg)) 105 #define WR4(sc, reg, val) bus_write_4((sc)->res, (reg), (val)) 106 107 static int aw_sid_sysctl(SYSCTL_HANDLER_ARGS); 108 109 static int 110 aw_sid_probe(device_t dev) 111 { 112 if (!ofw_bus_status_okay(dev)) 113 return (ENXIO); 114 115 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 116 return (ENXIO); 117 118 device_set_desc(dev, "Allwinner Secure ID Controller"); 119 return (BUS_PROBE_DEFAULT); 120 } 121 122 static int 123 aw_sid_attach(device_t dev) 124 { 125 struct aw_sid_softc *sc; 126 127 sc = device_get_softc(dev); 128 129 if (bus_alloc_resources(dev, aw_sid_spec, &sc->res) != 0) { 130 device_printf(dev, "cannot allocate resources for device\n"); 131 return (ENXIO); 132 } 133 134 aw_sid_sc = sc; 135 sc->sid_conf = (struct aw_sid_conf *)ofw_bus_search_compatible(dev, compat_data)->ocd_data; 136 137 SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev), 138 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 139 OID_AUTO, "rootkey", 140 CTLTYPE_STRING | CTLFLAG_RD, 141 dev, AW_SID_ROOT_KEY, aw_sid_sysctl, "A", "Root Key"); 142 143 return (0); 144 } 145 146 int 147 aw_sid_read_tscalib(uint32_t *calib0, uint32_t *calib1) 148 { 149 struct aw_sid_softc *sc; 150 151 sc = aw_sid_sc; 152 if (sc == NULL) 153 return (ENXIO); 154 if (!sc->sid_conf->has_thermal) 155 return (ENXIO); 156 157 *calib0 = RD4(sc, SID_THERMAL_CALIB0); 158 *calib1 = RD4(sc, SID_THERMAL_CALIB1); 159 160 return (0); 161 } 162 163 int 164 aw_sid_get_rootkey(u_char *out) 165 { 166 struct aw_sid_softc *sc; 167 int i; 168 bus_size_t root_key_off; 169 u_int tmp; 170 171 sc = aw_sid_sc; 172 if (sc == NULL) 173 return (ENXIO); 174 root_key_off = aw_sid_sc->sid_conf->rootkey_offset; 175 for (i = 0; i < ROOT_KEY_SIZE ; i++) { 176 tmp = RD4(aw_sid_sc, root_key_off + (i * 4)); 177 be32enc(&out[i * 4], tmp); 178 } 179 180 return (0); 181 } 182 183 static int 184 aw_sid_sysctl(SYSCTL_HANDLER_ARGS) 185 { 186 enum sid_keys key = arg2; 187 u_char rootkey[16]; 188 char out[33]; 189 190 if (key != AW_SID_ROOT_KEY) 191 return (ENOENT); 192 193 if (aw_sid_get_rootkey(rootkey) != 0) 194 return (ENOENT); 195 snprintf(out, sizeof(out), 196 "%16D", rootkey, ""); 197 198 return sysctl_handle_string(oidp, out, sizeof(out), req); 199 } 200 201 static device_method_t aw_sid_methods[] = { 202 /* Device interface */ 203 DEVMETHOD(device_probe, aw_sid_probe), 204 DEVMETHOD(device_attach, aw_sid_attach), 205 206 DEVMETHOD_END 207 }; 208 209 static driver_t aw_sid_driver = { 210 "aw_sid", 211 aw_sid_methods, 212 sizeof(struct aw_sid_softc), 213 }; 214 215 static devclass_t aw_sid_devclass; 216 217 EARLY_DRIVER_MODULE(aw_sid, simplebus, aw_sid_driver, aw_sid_devclass, 0, 0, 218 BUS_PASS_RESOURCE + BUS_PASS_ORDER_FIRST); 219 MODULE_VERSION(aw_sid, 1); 220