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/* $OpenBSD: plrtc.c,v 1.2 2021/10/24 17:52:26 mpi Exp $ */
/*
* Copyright (c) 2015 Jonathan Gray <jsg@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/device.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/clock_subr.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
#define RTCDR 0x00
#define RTCMR 0x04
#define RTCLR 0x08
#define RTCCR 0x0c
#define RTCIMSC 0x10
#define RTCRIS 0x14
#define RTCMIS 0x18
#define RTCICR 0x1c
#define RTCCR_START (1 << 0)
extern todr_chip_handle_t todr_handle;
struct plrtc_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
};
int plrtc_match(struct device *, void *, void *);
void plrtc_attach(struct device *, struct device *, void *);
int plrtc_gettime(struct todr_chip_handle *, struct timeval *);
int plrtc_settime(struct todr_chip_handle *, struct timeval *);
const struct cfattach plrtc_ca = {
sizeof(struct plrtc_softc), plrtc_match, plrtc_attach
};
struct cfdriver plrtc_cd = {
NULL, "plrtc", DV_DULL
};
int
plrtc_gettime(todr_chip_handle_t handle, struct timeval *tv)
{
struct plrtc_softc *sc = handle->cookie;
uint32_t tod;
tod = bus_space_read_4(sc->sc_iot, sc->sc_ioh, RTCDR);
tv->tv_sec = tod;
tv->tv_usec = 0;
return (0);
}
int
plrtc_settime(todr_chip_handle_t handle, struct timeval *tv)
{
struct plrtc_softc *sc = handle->cookie;
bus_space_write_4(sc->sc_iot, sc->sc_ioh, RTCLR, tv->tv_sec);
return (0);
}
int
plrtc_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return (OF_is_compatible(faa->fa_node, "arm,pl031"));
}
void
plrtc_attach(struct device *parent, struct device *self, void *aux)
{
struct fdt_attach_args *faa = aux;
struct plrtc_softc *sc = (struct plrtc_softc *) self;
todr_chip_handle_t handle;
if (faa->fa_nreg < 1) {
printf(": no register data\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(": failed to map mem space\n");
return;
}
handle = malloc(sizeof(struct todr_chip_handle), M_DEVBUF,
M_NOWAIT | M_ZERO);
if (handle == NULL)
panic("couldn't allocate todr_handle");
handle->cookie = sc;
handle->todr_gettime = plrtc_gettime;
handle->todr_settime = plrtc_settime;
todr_handle = handle;
/* enable the rtc */
bus_space_write_4(sc->sc_iot, sc->sc_ioh, RTCCR, RTCCR_START);
printf("\n");
}
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