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 A10_ROOT_KEY_OFF 0x0 56 #define A83T_ROOT_KEY_OFF SID_SRAM 57 58 #define ROOT_KEY_SIZE 4 59 60 enum sid_type { 61 A10_SID = 1, 62 A20_SID, 63 A83T_SID, 64 }; 65 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}, 70 { NULL, 0 } 71 }; 72 73 struct aw_sid_softc { 74 struct resource *res; 75 int type; 76 bus_size_t root_key_off; 77 }; 78 79 static struct aw_sid_softc *aw_sid_sc; 80 81 static struct resource_spec aw_sid_spec[] = { 82 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 83 { -1, 0 } 84 }; 85 86 enum sid_keys { 87 AW_SID_ROOT_KEY, 88 }; 89 90 #define RD4(sc, reg) bus_read_4((sc)->res, (reg)) 91 #define WR4(sc, reg, val) bus_write_4((sc)->res, (reg), (val)) 92 93 static int aw_sid_sysctl(SYSCTL_HANDLER_ARGS); 94 95 static int 96 aw_sid_probe(device_t dev) 97 { 98 if (!ofw_bus_status_okay(dev)) 99 return (ENXIO); 100 101 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 102 return (ENXIO); 103 104 device_set_desc(dev, "Allwinner Secure ID Controller"); 105 return (BUS_PROBE_DEFAULT); 106 } 107 108 static int 109 aw_sid_attach(device_t dev) 110 { 111 struct aw_sid_softc *sc; 112 113 sc = device_get_softc(dev); 114 115 if (bus_alloc_resources(dev, aw_sid_spec, &sc->res) != 0) { 116 device_printf(dev, "cannot allocate resources for device\n"); 117 return (ENXIO); 118 } 119 120 aw_sid_sc = sc; 121 122 sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data; 123 switch (sc->type) { 124 case A83T_SID: 125 sc->root_key_off = A83T_ROOT_KEY_OFF; 126 break; 127 default: 128 sc->root_key_off = A10_ROOT_KEY_OFF; 129 break; 130 } 131 132 SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev), 133 SYSCTL_CHILDREN(device_get_sysctl_tree(dev)), 134 OID_AUTO, "rootkey", 135 CTLTYPE_STRING | CTLFLAG_RD, 136 dev, AW_SID_ROOT_KEY, aw_sid_sysctl, "A", "Root Key"); 137 138 return (0); 139 } 140 141 int 142 aw_sid_read_tscalib(uint32_t *calib0, uint32_t *calib1) 143 { 144 struct aw_sid_softc *sc; 145 146 sc = aw_sid_sc; 147 if (sc == NULL) 148 return (ENXIO); 149 if (sc->type != A83T_SID) 150 return (ENXIO); 151 152 *calib0 = RD4(sc, SID_THERMAL_CALIB0); 153 *calib1 = RD4(sc, SID_THERMAL_CALIB1); 154 155 return (0); 156 } 157 158 int 159 aw_sid_get_rootkey(u_char *out) 160 { 161 struct aw_sid_softc *sc; 162 int i; 163 u_int tmp; 164 165 sc = aw_sid_sc; 166 if (sc == NULL) 167 return (ENXIO); 168 169 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); 172 } 173 174 return (0); 175 } 176 177 static int 178 aw_sid_sysctl(SYSCTL_HANDLER_ARGS) 179 { 180 enum sid_keys key = arg2; 181 u_char rootkey[16]; 182 char out[33]; 183 184 if (key != AW_SID_ROOT_KEY) 185 return (ENOENT); 186 187 if (aw_sid_get_rootkey(rootkey) != 0) 188 return (ENOENT); 189 snprintf(out, sizeof(out), 190 "%16D", rootkey, ""); 191 192 return sysctl_handle_string(oidp, out, sizeof(out), req); 193 } 194 195 static device_method_t aw_sid_methods[] = { 196 /* Device interface */ 197 DEVMETHOD(device_probe, aw_sid_probe), 198 DEVMETHOD(device_attach, aw_sid_attach), 199 200 DEVMETHOD_END 201 }; 202 203 static driver_t aw_sid_driver = { 204 "aw_sid", 205 aw_sid_methods, 206 sizeof(struct aw_sid_softc), 207 }; 208 209 static devclass_t aw_sid_devclass; 210 211 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); 214