280ab2edb1
The rootkey is burnt at production and can't be changed, thus is can be used as a device unique ID or to generate a MAC address (This is was u-boot does). The rootkey is exposed as a sysctl (dev.aw_sid.<unit>.rootkey). Reviewed by: jmcneill Differential Revision: https://reviews.freebsd.org/D6383
210 lines
4.8 KiB
C
210 lines
4.8 KiB
C
/*-
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* Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Allwinner secure ID controller
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/endian.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/rman.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/sysctl.h>
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#include <machine/bus.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <arm/allwinner/aw_sid.h>
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#define SID_SRAM 0x200
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#define SID_THERMAL_CALIB0 (SID_SRAM + 0x34)
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#define SID_THERMAL_CALIB1 (SID_SRAM + 0x38)
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enum sid_type {
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A10_SID = 1,
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A20_SID,
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A83T_SID,
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};
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static struct ofw_compat_data compat_data[] = {
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{ "allwinner,sun4i-a10-sid", A10_SID},
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{ "allwinner,sun7i-a20-sid", A20_SID},
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{ "allwinner,sun8i-a83t-sid", A83T_SID},
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{ NULL, 0 }
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};
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struct aw_sid_softc {
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struct resource *res;
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int type;
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};
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static struct aw_sid_softc *aw_sid_sc;
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static struct resource_spec aw_sid_spec[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE },
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{ -1, 0 }
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};
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enum sid_keys {
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AW_SID_ROOT_KEY,
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};
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#define ROOT_KEY_OFF 0x0
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#define ROOT_KEY_SIZE 4
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#define RD4(sc, reg) bus_read_4((sc)->res, (reg))
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#define WR4(sc, reg, val) bus_write_4((sc)->res, (reg), (val))
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static int aw_sid_sysctl(SYSCTL_HANDLER_ARGS);
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static int
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aw_sid_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
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return (ENXIO);
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device_set_desc(dev, "Allwinner Secure ID Controller");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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aw_sid_attach(device_t dev)
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{
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struct aw_sid_softc *sc;
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sc = device_get_softc(dev);
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if (bus_alloc_resources(dev, aw_sid_spec, &sc->res) != 0) {
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device_printf(dev, "cannot allocate resources for device\n");
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return (ENXIO);
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}
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aw_sid_sc = sc;
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sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
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switch (sc->type) {
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case A10_SID:
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case A20_SID:
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SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
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SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
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OID_AUTO, "rootkey",
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CTLTYPE_STRING | CTLFLAG_RD,
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dev, AW_SID_ROOT_KEY, aw_sid_sysctl, "A", "Root Key");
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break;
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default:
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break;
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}
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return (0);
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}
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int
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aw_sid_read_tscalib(uint32_t *calib0, uint32_t *calib1)
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{
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struct aw_sid_softc *sc;
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sc = aw_sid_sc;
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if (sc == NULL)
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return (ENXIO);
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if (sc->type != A83T_SID)
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return (ENXIO);
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*calib0 = RD4(sc, SID_THERMAL_CALIB0);
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*calib1 = RD4(sc, SID_THERMAL_CALIB1);
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return (0);
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}
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int
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aw_sid_get_rootkey(u_char *out)
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{
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struct aw_sid_softc *sc;
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int i;
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u_int tmp;
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sc = aw_sid_sc;
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if (sc == NULL)
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return (ENXIO);
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if (sc->type != A10_SID && sc->type != A20_SID)
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return (ENXIO);
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for (i = 0; i < ROOT_KEY_SIZE ; i++) {
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tmp = RD4(aw_sid_sc, ROOT_KEY_OFF + (i * 4));
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be32enc(&out[i * 4], tmp);
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}
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return (0);
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}
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static int
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aw_sid_sysctl(SYSCTL_HANDLER_ARGS)
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{
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enum sid_keys key = arg2;
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u_char rootkey[16];
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char out[33];
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if (key != AW_SID_ROOT_KEY)
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return (ENOENT);
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if (aw_sid_get_rootkey(rootkey) != 0)
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return (ENOENT);
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snprintf(out, sizeof(out),
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"%16D", rootkey, "");
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return sysctl_handle_string(oidp, out, sizeof(out), req);
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}
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static device_method_t aw_sid_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, aw_sid_probe),
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DEVMETHOD(device_attach, aw_sid_attach),
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DEVMETHOD_END
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};
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static driver_t aw_sid_driver = {
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"aw_sid",
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aw_sid_methods,
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sizeof(struct aw_sid_softc),
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};
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static devclass_t aw_sid_devclass;
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EARLY_DRIVER_MODULE(aw_sid, simplebus, aw_sid_driver, aw_sid_devclass, 0, 0,
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BUS_PASS_RESOURCE + BUS_PASS_ORDER_FIRST);
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MODULE_VERSION(aw_sid, 1);
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