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/param.h> 37 #include <sys/systm.h> 38 #include <sys/bus.h> 39 #include <sys/rman.h> 40 #include <sys/kernel.h> 41 #include <sys/module.h> 42 #include <machine/bus.h> 43 44 #include <dev/ofw/ofw_bus.h> 45 #include <dev/ofw/ofw_bus_subr.h> 46 47 #include <arm/allwinner/aw_sid.h> 48 49 #define SID_SRAM 0x200 50 #define SID_THERMAL_CALIB0 (SID_SRAM + 0x34) 51 #define SID_THERMAL_CALIB1 (SID_SRAM + 0x38) 52 53 static struct ofw_compat_data compat_data[] = { 54 { "allwinner,sun8i-a83t-sid", 1 }, 55 { NULL, 0 } 56 }; 57 58 struct aw_sid_softc { 59 struct resource *res; 60 }; 61 62 static struct aw_sid_softc *aw_sid_sc; 63 64 static struct resource_spec aw_sid_spec[] = { 65 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 66 { -1, 0 } 67 }; 68 69 #define RD4(sc, reg) bus_read_4((sc)->res, (reg)) 70 #define WR4(sc, reg, val) bus_write_4((sc)->res, (reg), (val)) 71 72 static int 73 aw_sid_probe(device_t dev) 74 { 75 if (!ofw_bus_status_okay(dev)) 76 return (ENXIO); 77 78 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 79 return (ENXIO); 80 81 device_set_desc(dev, "Allwinner Secure ID Controller"); 82 return (BUS_PROBE_DEFAULT); 83 } 84 85 static int 86 aw_sid_attach(device_t dev) 87 { 88 struct aw_sid_softc *sc; 89 90 sc = device_get_softc(dev); 91 92 if (bus_alloc_resources(dev, aw_sid_spec, &sc->res) != 0) { 93 device_printf(dev, "cannot allocate resources for device\n"); 94 return (ENXIO); 95 } 96 97 aw_sid_sc = sc; 98 99 return (0); 100 } 101 102 int 103 aw_sid_read_tscalib(uint32_t *calib0, uint32_t *calib1) 104 { 105 struct aw_sid_softc *sc; 106 107 sc = aw_sid_sc; 108 if (sc == NULL) 109 return (ENXIO); 110 111 *calib0 = RD4(sc, SID_THERMAL_CALIB0); 112 *calib1 = RD4(sc, SID_THERMAL_CALIB1); 113 114 return (0); 115 } 116 117 static device_method_t aw_sid_methods[] = { 118 /* Device interface */ 119 DEVMETHOD(device_probe, aw_sid_probe), 120 DEVMETHOD(device_attach, aw_sid_attach), 121 122 DEVMETHOD_END 123 }; 124 125 static driver_t aw_sid_driver = { 126 "aw_sid", 127 aw_sid_methods, 128 sizeof(struct aw_sid_softc), 129 }; 130 131 static devclass_t aw_sid_devclass; 132 133 EARLY_DRIVER_MODULE(aw_sid, simplebus, aw_sid_driver, aw_sid_devclass, 0, 0, 134 BUS_PASS_RESOURCE + BUS_PASS_ORDER_FIRST); 135 MODULE_VERSION(aw_sid, 1); 136