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/* $OpenBSD: acrtc.c,v 1.6 2022/10/17 19:09:46 kettenis Exp $ */
/*
* Copyright (c) 2017 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 <dev/fdt/rsbvar.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_clock.h>
#include <dev/ofw/fdt.h>
#include <dev/clock_subr.h>
#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
#define CK32K_OUT_CTRL1 0xc1
#define CK32K_OUT_CTRL_PRE_DIV_MASK (0x7 << 5)
#define CK32K_OUT_CTRL_PRE_DIV_32K (0x7 << 5)
#define CK32K_OUT_CTRL_MUX_SEL_MASK (1 << 4)
#define CK32K_OUT_CTRL_MUX_SEL_32K (0 << 4)
#define CK32K_OUT_CTRL_POST_DIV_MASK (0x7 << 1)
#define CK32K_OUT_CTRL_POST_DIV_32K (0x0 << 1)
#define CK32K_OUT_CTRL_ENA (1 << 0)
#define RTC_CTRL 0xc7
#define RTC_CTRL_12H_24H_MODE (1 << 0)
#define RTC_SEC 0xc8
#define RTC_SEC_MASK (0x7f << 0)
#define RTC_MIN 0xc9
#define RTC_MIN_MASK (0x7f << 0)
#define RTC_HOU 0xca
#define RTC_HOU_MASK (0x3f << 0)
#define RTC_WEE 0xcb
#define RTC_WEE_MASK (0x07 << 0)
#define RTC_DAY 0xcc
#define RTC_DAY_MASK (0x3f << 0)
#define RTC_MON 0xcd
#define RTC_MON_MASK (0x1f << 0)
#define RTC_YEA 0xce
#define RTC_YEA_LEAP_YEAR (1 << 15)
#define RTC_YEA_MASK (0xff << 0)
#define RTC_UPD_TRIG 0xcf
#define RTC_UPD_TRIG_UPDATE (1 << 15)
struct acrtc_softc {
struct device sc_dev;
void *sc_cookie;
uint16_t sc_rta;
struct todr_chip_handle sc_todr;
struct clock_device sc_cd;
};
int acrtc_match(struct device *, void *, void *);
void acrtc_attach(struct device *, struct device *, void *);
const struct cfattach acrtc_ca = {
sizeof(struct acrtc_softc), acrtc_match, acrtc_attach
};
struct cfdriver acrtc_cd = {
NULL, "acrtc", DV_DULL
};
int acrtc_clock_read(struct acrtc_softc *, struct clock_ymdhms *);
int acrtc_clock_write(struct acrtc_softc *, struct clock_ymdhms *);
int acrtc_gettime(struct todr_chip_handle *, struct timeval *);
int acrtc_settime(struct todr_chip_handle *, struct timeval *);
void acrtc_ck32k_enable(void *, uint32_t *, int);
int
acrtc_match(struct device *parent, void *match, void *aux)
{
struct rsb_attach_args *ra = aux;
if (strcmp(ra->ra_name, "x-powers,ac100") == 0)
return 1;
return 0;
}
void
acrtc_attach(struct device *parent, struct device *self, void *aux)
{
struct acrtc_softc *sc = (struct acrtc_softc *)self;
struct rsb_attach_args *ra = aux;
int node;
sc->sc_cookie = ra->ra_cookie;
sc->sc_rta = ra->ra_rta;
printf("\n");
sc->sc_todr.cookie = sc;
sc->sc_todr.todr_gettime = acrtc_gettime;
sc->sc_todr.todr_settime = acrtc_settime;
sc->sc_todr.todr_quality = 1000;
todr_attach(&sc->sc_todr);
node = OF_getnodebyname(ra->ra_node, "rtc");
if (node == 0)
return;
sc->sc_cd.cd_node = node;
sc->sc_cd.cd_cookie = sc;
sc->sc_cd.cd_enable = acrtc_ck32k_enable;
clock_register(&sc->sc_cd);
}
static inline uint16_t
acrtc_read_reg(struct acrtc_softc *sc, uint8_t reg)
{
return rsb_read_2(sc->sc_cookie, sc->sc_rta, reg);
}
static inline void
acrtc_write_reg(struct acrtc_softc *sc, uint8_t reg, uint16_t value)
{
rsb_write_2(sc->sc_cookie, sc->sc_rta, reg, value);
}
int
acrtc_gettime(struct todr_chip_handle *handle, struct timeval *tv)
{
struct acrtc_softc *sc = handle->cookie;
struct clock_ymdhms dt;
int error;
error = acrtc_clock_read(sc, &dt);
if (error)
return error;
if (dt.dt_sec > 59 || dt.dt_min > 59 || dt.dt_hour > 23 ||
dt.dt_day > 31 || dt.dt_day == 0 ||
dt.dt_mon > 12 || dt.dt_mon == 0 ||
dt.dt_year < POSIX_BASE_YEAR)
return EINVAL;
tv->tv_sec = clock_ymdhms_to_secs(&dt);
tv->tv_usec = 0;
return 0;
}
int
acrtc_settime(struct todr_chip_handle *handle, struct timeval *tv)
{
struct acrtc_softc *sc = handle->cookie;
struct clock_ymdhms dt;
clock_secs_to_ymdhms(tv->tv_sec, &dt);
return acrtc_clock_write(sc, &dt);
}
int
acrtc_clock_read(struct acrtc_softc *sc, struct clock_ymdhms *dt)
{
uint16_t ctrl;
dt->dt_sec = FROMBCD(acrtc_read_reg(sc, RTC_SEC) & RTC_SEC_MASK);
dt->dt_min = FROMBCD(acrtc_read_reg(sc, RTC_MIN) & RTC_MIN_MASK);
dt->dt_hour = FROMBCD(acrtc_read_reg(sc, RTC_HOU) & RTC_HOU_MASK);
dt->dt_day = FROMBCD(acrtc_read_reg(sc, RTC_DAY) & RTC_DAY_MASK);
dt->dt_mon = FROMBCD(acrtc_read_reg(sc, RTC_MON) & RTC_MON_MASK);
dt->dt_year = FROMBCD(acrtc_read_reg(sc, RTC_YEA) & RTC_YEA_MASK);
dt->dt_year += 2000;
#ifdef DEBUG
printf("%02d/%02d/%04d %02d:%02d:%0d\n", dt->dt_day, dt->dt_mon,
dt->dt_year, dt->dt_hour, dt->dt_min, dt->dt_sec);
#endif
/* Consider the time to be invalid if the clock is in 12H mode. */
ctrl = acrtc_read_reg(sc, RTC_CTRL);
if ((ctrl & RTC_CTRL_12H_24H_MODE) == 0)
return EINVAL;
return 0;
}
int
acrtc_clock_write(struct acrtc_softc *sc, struct clock_ymdhms *dt)
{
uint16_t leap = isleap(dt->dt_year) ? RTC_YEA_LEAP_YEAR : 0;
acrtc_write_reg(sc, RTC_SEC, TOBCD(dt->dt_sec));
acrtc_write_reg(sc, RTC_MIN, TOBCD(dt->dt_min));
acrtc_write_reg(sc, RTC_HOU, TOBCD(dt->dt_hour));
acrtc_write_reg(sc, RTC_WEE, TOBCD(dt->dt_wday));
acrtc_write_reg(sc, RTC_DAY, TOBCD(dt->dt_day));
acrtc_write_reg(sc, RTC_MON, TOBCD(dt->dt_mon));
acrtc_write_reg(sc, RTC_YEA, TOBCD(dt->dt_year - 2000) | leap);
acrtc_write_reg(sc, RTC_UPD_TRIG, RTC_UPD_TRIG_UPDATE);
/* Switch to 24H mode to indicate the time is now valid. */
acrtc_write_reg(sc, RTC_CTRL, RTC_CTRL_12H_24H_MODE);
return 0;
}
void
acrtc_ck32k_enable(void *cookie, uint32_t *cells, int on)
{
struct acrtc_softc *sc = cookie;
uint32_t idx = cells[0];
uint16_t reg;
reg = acrtc_read_reg(sc, CK32K_OUT_CTRL1 + idx);
reg &= ~CK32K_OUT_CTRL_PRE_DIV_MASK;
reg &= ~CK32K_OUT_CTRL_MUX_SEL_MASK;
reg &= ~CK32K_OUT_CTRL_POST_DIV_MASK;
reg |= CK32K_OUT_CTRL_PRE_DIV_32K;
reg |= CK32K_OUT_CTRL_MUX_SEL_32K;
reg |= CK32K_OUT_CTRL_POST_DIV_32K;
if (on)
reg |= CK32K_OUT_CTRL_ENA;
else
reg &= ~CK32K_OUT_CTRL_ENA;
acrtc_write_reg(sc, CK32K_OUT_CTRL1 + idx, reg);
}
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