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/* $OpenBSD: qcrng.c,v 1.1 2023/04/28 05:13:37 phessler Exp $ */
/*
* Copyright (c) 2019 Mark Kettenis <kettenis@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/device.h>
#include <sys/timeout.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
/* Registers */
#define RNG_DATA 0x0000
#define RNG_STATUS 0x0004
#define HREAD4(sc, reg) \
(bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
struct qcrng_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
struct timeout sc_to;
};
int qcrng_match(struct device *, void *, void *);
void qcrng_attach(struct device *, struct device *, void *);
const struct cfattach qcrng_ca = {
sizeof (struct qcrng_softc), qcrng_match, qcrng_attach
};
struct cfdriver qcrng_cd = {
NULL, "qcrng", DV_DULL
};
void qcrng_rnd(void *);
int
qcrng_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "qcom,prng-ee");
}
void
qcrng_attach(struct device *parent, struct device *self, void *aux)
{
struct qcrng_softc *sc = (struct qcrng_softc *)self;
struct fdt_attach_args *faa = aux;
if (faa->fa_nreg < 1) {
printf(": no registers\n");
return;
}
sc->sc_iot = faa->fa_iot;
if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
printf(": can't map registers\n");
return;
}
printf("\n");
timeout_set(&sc->sc_to, qcrng_rnd, sc);
qcrng_rnd(sc);
}
void
qcrng_rnd(void *arg)
{
struct qcrng_softc *sc = arg;
if (HREAD4(sc, RNG_STATUS) & 0x1)
enqueue_randomness(HREAD4(sc, RNG_DATA));
timeout_add_sec(&sc->sc_to, 1);
}
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