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/* $OpenBSD: sxisid.c,v 1.1 2019/10/23 20:32:20 kettenis Exp $ */
/*
* Copyright (c) 2019 Krystian Lewandowski
* 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/malloc.h>
#include <sys/mutex.h>
#include <machine/fdt.h>
#include <machine/bus.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
#include <dev/rndvar.h>
/* Registers */
#define SID_PRCTL 0x40
#define SID_PRCTL_OFFSET(n) (((n) & 0x1ff) << 16)
#define SID_PRCTL_OP_LOCK (0xac << 8)
#define SID_PRCTL_READ (1 << 1)
#define SID_RDKEY 0x60
#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 sxisid_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
bus_size_t sc_size;
};
int sxisid_match(struct device *, void *, void *);
void sxisid_attach(struct device *, struct device *, void *);
struct cfattach sxisid_ca = {
sizeof(struct sxisid_softc), sxisid_match, sxisid_attach
};
struct cfdriver sxisid_cd = {
NULL, "sxisid", DV_DULL
};
size_t sxisid_read(void *, size_t, uint8_t *, size_t);
int
sxisid_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return (OF_is_compatible(faa->fa_node, "allwinner,sun4i-a10-sid") ||
OF_is_compatible(faa->fa_node, "allwinner,sun7i-a20-sid") ||
OF_is_compatible(faa->fa_node, "allwinner,sun8i-a83t-sid") ||
OF_is_compatible(faa->fa_node, "allwinner,sun8i-h3-sid") ||
OF_is_compatible(faa->fa_node, "allwinner,sun50i-a64-sid") ||
OF_is_compatible(faa->fa_node, "allwinner,sun50i-h5-sid") ||
OF_is_compatible(faa->fa_node, "allwinner,sun50i-h6-sid"));
}
void
sxisid_attach(struct device *parent, struct device *self, void *aux)
{
struct sxisid_softc *sc = (struct sxisid_softc *) self;
struct fdt_attach_args *faa = aux;
uint32_t sid[4];
int i;
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");
if (OF_is_compatible(faa->fa_node, "allwinner,sun4i-a10-sid"))
sc->sc_size = 0x10;
else if (OF_is_compatible(faa->fa_node, "allwinner,sun8i-a83t-sid") ||
OF_is_compatible(faa->fa_node, "allwinner,sun8i-h3-sid") ||
OF_is_compatible(faa->fa_node, "allwinner,sun50i-a64-sid") ||
OF_is_compatible(faa->fa_node, "allwinner,sun50i-h5-sid"))
sc->sc_size = 0x100;
else
sc->sc_size = 0x200;
if (sxisid_read(sc, 0, (uint8_t *)&sid, sizeof(sid)) != sizeof(sid))
return;
for (i = 0; i < nitems(sid); i++)
enqueue_randomness(sid[i]);
}
size_t
sxisid_read(void *cookie, size_t offset, uint8_t *datap, size_t count)
{
struct sxisid_softc *sc = cookie;
uint32_t val;
int pos, len;
int timo, i;
if (offset >= sc->sc_size)
return 0;
if (offset + count > sc->sc_size)
count = sc->sc_size - offset;
len = 0;
pos = offset;
while (len < count) {
HWRITE4(sc, SID_PRCTL, SID_PRCTL_OFFSET(pos) |
SID_PRCTL_OP_LOCK | SID_PRCTL_READ);
for (timo = 2500; timo > 0; timo--) {
if ((HREAD4(sc, SID_PRCTL) & SID_PRCTL_READ) == 0)
break;
delay(100);
}
if (timo == 0)
return len;
val = HREAD4(sc, SID_RDKEY);
for (i = 0; i < 4 && len < count; i++) {
datap[len++] = val & 0xff;
val >>= 8;
pos++;
}
}
return len;
}
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