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/* $OpenBSD: imxrtc.c,v 1.3 2022/10/17 19:09:46 kettenis Exp $ */
/*
* Copyright (c) 2018 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 <machine/intr.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
#include <dev/ofw/ofw_misc.h>
#include <dev/clock_subr.h>
/* Registers. */
#define LPCR 0x38
#define LPCR_SRTC_ENV (1 << 0)
#define LPSR 0x4c
#define LPSRTCMR 0x50
#define LPSRTCLR 0x54
#define HREAD4(sc, reg) \
(regmap_read_4((sc)->sc_rm, (reg)))
#define HWRITE4(sc, reg, val) \
regmap_write_4((sc)->sc_rm, (reg), (val))
struct imxrtc_softc {
struct device sc_dev;
struct regmap *sc_rm;
struct todr_chip_handle sc_todr;
};
int imxrtc_match(struct device *, void *, void *);
void imxrtc_attach(struct device *, struct device *, void *);
const struct cfattach imxrtc_ca = {
sizeof (struct imxrtc_softc), imxrtc_match, imxrtc_attach
};
struct cfdriver imxrtc_cd = {
NULL, "imxrtc", DV_DULL
};
int imxrtc_gettime(struct todr_chip_handle *, struct timeval *);
int imxrtc_settime(struct todr_chip_handle *, struct timeval *);
int
imxrtc_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "fsl,sec-v4.0-mon-rtc-lp");
}
void
imxrtc_attach(struct device *parent, struct device *self, void *aux)
{
struct imxrtc_softc *sc = (struct imxrtc_softc *)self;
struct fdt_attach_args *faa = aux;
uint32_t regmap;
regmap = OF_getpropint(faa->fa_node, "regmap", 0);
sc->sc_rm = regmap_byphandle(regmap);
if (sc->sc_rm == NULL) {
printf(": no registers\n");
return;
}
printf("\n");
sc->sc_todr.cookie = sc;
sc->sc_todr.todr_gettime = imxrtc_gettime;
sc->sc_todr.todr_settime = imxrtc_settime;
sc->sc_todr.todr_quality = 0;
todr_attach(&sc->sc_todr);
}
int
imxrtc_gettime(struct todr_chip_handle *handle, struct timeval *tv)
{
struct imxrtc_softc *sc = handle->cookie;
uint64_t mr, lr, srtc, srtc2;
uint32_t cr;
int retries;
int s;
cr = HREAD4(sc, LPCR);
if ((cr & LPCR_SRTC_ENV) == 0)
return EINVAL;
/*
* Read counters until we read back the same values twice.
* This shouldn't take more than two attempts; throw in an
* extra round just in case.
*/
s = splhigh();
mr = HREAD4(sc, LPSRTCMR);
lr = HREAD4(sc, LPSRTCLR);
srtc = (mr << 32) | lr;
for (retries = 3; retries > 0; retries--) {
mr = HREAD4(sc, LPSRTCMR);
lr = HREAD4(sc, LPSRTCLR);
srtc2 = (mr << 32) | lr;
if (srtc == srtc2)
break;
srtc = srtc2;
}
splx(s);
if (retries == 0)
return EIO;
tv->tv_sec = srtc / 32768;
tv->tv_usec = ((srtc % 32768) * 1000000U) / 32768U;
return 0;
}
int
imxrtc_settime(struct todr_chip_handle *handle, struct timeval *tv)
{
struct imxrtc_softc *sc = handle->cookie;
uint64_t srtc;
uint32_t cr;
int timeout;
/* Disable RTC. */
cr = HREAD4(sc, LPCR);
cr &= ~LPCR_SRTC_ENV;
HWRITE4(sc, LPCR, cr);
for (timeout = 1000000; timeout > 0; timeout--) {
if ((HREAD4(sc, LPCR) & LPCR_SRTC_ENV) == 0)
break;
}
srtc = tv->tv_sec * 32768 + (tv->tv_usec * 32768U / 1000000U);
HWRITE4(sc, LPSRTCMR, srtc >> 32);
HWRITE4(sc, LPSRTCLR, srtc & 0xffffffff);
/* Enable RTC. */
cr |= LPCR_SRTC_ENV;
HWRITE4(sc, LPCR, cr);
for (timeout = 1000000; timeout > 0; timeout--) {
if (HREAD4(sc, LPCR) & LPCR_SRTC_ENV)
break;
}
return 0;
}
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