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/* $OpenBSD: ccp.c,v 1.2 2018/04/28 15:44:59 jasper Exp $ */
/*
* Copyright (c) 2018 David Gwynne <dlg@openbsd.org>
*
* Permission to use, copy, modify, and 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/buf.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/timeout.h>
#include <machine/bus.h>
#include <dev/rndvar.h>
#include <dev/ic/ccpvar.h>
#define CCP_REG_TRNG 0xc
static void ccp_rng(void *);
struct cfdriver ccp_cd = {
NULL,
"ccp",
DV_DULL
};
void
ccp_attach(struct ccp_softc *sc)
{
timeout_set(&sc->sc_tick, ccp_rng, sc);
ccp_rng(sc);
printf("\n");
}
static void
ccp_rng(void *arg)
{
struct ccp_softc *sc = arg;
uint32_t trng;
trng = bus_space_read_4(sc->sc_iot, sc->sc_ioh, CCP_REG_TRNG);
if (trng != 0)
enqueue_randomness(trng);
timeout_add_msec(&sc->sc_tick, 100);
}
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