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/* $OpenBSD: rkrng.c,v 1.3 2020/05/29 04:42:25 deraadt Exp $ */
/*
* Copyright (c) 2020 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/ofw_clock.h>
#include <dev/ofw/fdt.h>
/* Registers */
#define RNG_CTRL 0x0008
#define RNG_CTRL_START (1 << 8)
#define RNG_TRNG_CTRL 0x0200
#define RNG_TRNG_CTRL_OSC_ENABLE (1 << 16)
#define RNG_TRNG_CTRL_SAMPLE_PERIOD(x) (x)
#define RNG_DATA0 0x0204
#define HREAD4(sc, reg) \
(bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
#define HWRITE4(sc, reg, val) \
bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
struct rkrng_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
struct timeout sc_to;
int sc_started;
};
int rkrng_match(struct device *, void *, void *);
void rkrng_attach(struct device *, struct device *, void *);
struct cfattach rkrng_ca = {
sizeof (struct rkrng_softc), rkrng_match, rkrng_attach
};
struct cfdriver rkrng_cd = {
NULL, "rkrng", DV_DULL
};
void rkrng_rnd(void *);
int
rkrng_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "rockchip,cryptov1-rng");
}
void
rkrng_attach(struct device *parent, struct device *self, void *aux)
{
struct rkrng_softc *sc = (struct rkrng_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");
clock_set_assigned(faa->fa_node);
clock_enable_all(faa->fa_node);
timeout_set(&sc->sc_to, rkrng_rnd, sc);
rkrng_rnd(sc);
}
void
rkrng_rnd(void *arg)
{
struct rkrng_softc *sc = arg;
bus_size_t off;
if (!sc->sc_started) {
HWRITE4(sc, RNG_TRNG_CTRL, RNG_TRNG_CTRL_OSC_ENABLE |
RNG_TRNG_CTRL_SAMPLE_PERIOD(100));
HWRITE4(sc, RNG_CTRL, (RNG_CTRL_START << 16) | RNG_CTRL_START);
sc->sc_started = 1;
timeout_add_usec(&sc->sc_to, 100);
return;
}
if (HREAD4(sc, RNG_CTRL) & RNG_CTRL_START) {
timeout_add_usec(&sc->sc_to, 100);
return;
}
for (off = 0; off < 32; off += 4)
enqueue_randomness(HREAD4(sc, RNG_DATA0 + off));
HWRITE4(sc, RNG_CTRL, (RNG_CTRL_START << 16) | 0);
sc->sc_started = 0;
timeout_add_sec(&sc->sc_to, 1);
}
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