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