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/* $OpenBSD: octrng.c,v 1.9 2020/05/29 04:42:24 deraadt Exp $ */
/*
* Copyright (c) 2013 Paul Irofti <paul@irofti.net>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/timeout.h>
#include <machine/octeonvar.h>
#include <machine/octeonreg.h>
#include <octeon/dev/iobusvar.h>
int octrng_match(struct device *, void *, void *);
void octrng_attach(struct device *, struct device *, void *);
void octrng_rnd(void *arg);
#ifdef OCTRNG_DEBUG
#define DPRINTF(x) printf x
#else
#define DPRINTF(x)
#endif
#define OCTRNG_MAP_SIZE 8ULL
/* OCTRNG_ENTROPY_ADDR 0x8001400000000000ULL */
#define OCTRNG_MAJORDID 8ULL
#define OCTRNG_ENTROPY_ADDR (((uint64_t)1 << 48) | \
((uint64_t)(OCTRNG_MAJORDID & 0x1f) << 43))
#define OCTRNG_ENTROPY_REG 0
#define OCTRNG_CONTROL_ADDR 0x0001180040000000ULL
#define OCTRNG_RESET (1ULL << 3)
#define OCTRNG_ENABLE_OUTPUT (1ULL << 1)
#define OCTRNG_ENABLE_ENTROPY (1ULL << 0)
struct octrng_softc {
struct device sc_dev;
struct timeout sc_to;
struct iobus_attach_args *sc_io;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
};
struct cfattach octrng_ca = {
sizeof(struct octrng_softc), octrng_match, octrng_attach
};
struct cfdriver octrng_cd = {
NULL, "octrng", DV_DULL
};
int
octrng_match(struct device *parent, void *match, void *aux)
{
struct iobus_attach_args *aa = aux;
struct cfdata *cf = match;
/* XXX: check for board type */
if (strcmp(aa->aa_name, cf->cf_driver->cd_name) != 0)
return (0);
return (1);
}
void
octrng_attach(struct device *parent, struct device *self, void *aux)
{
struct octrng_softc *sc = (void *)self;
sc->sc_io = aux;
uint64_t control_reg;
sc->sc_iot = sc->sc_io->aa_bust;
if (bus_space_map(sc->sc_iot, OCTEON_RNG_BASE, OCTRNG_MAP_SIZE, 0,
&sc->sc_ioh)) {
printf(": can't map registers");
}
control_reg = octeon_xkphys_read_8(OCTRNG_CONTROL_ADDR);
control_reg |= (OCTRNG_ENABLE_OUTPUT | OCTRNG_ENABLE_ENTROPY);
octeon_xkphys_write_8(OCTRNG_CONTROL_ADDR, control_reg);
timeout_set(&sc->sc_to, octrng_rnd, sc);
timeout_add_sec(&sc->sc_to, 5);
printf("\n");
}
void
octrng_rnd(void *arg)
{
struct octrng_softc *sc = arg;
uint64_t value;
value = bus_space_read_8(sc->sc_iot, sc->sc_ioh, OCTRNG_ENTROPY_REG);
DPRINTF(("%#llX ", value)); /* WARNING: very verbose */
enqueue_randomness(value);
timeout_add_msec(&sc->sc_to, 10);
}
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