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/* $OpenBSD: dapmic.c,v 1.1 2021/06/16 12:37:24 kettenis Exp $ */
/*
* Copyright (c) 2021 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/ofw/openfirm.h>
#include <dev/ofw/ofw_regulator.h>
#include <dev/ofw/fdt.h>
#include <dev/i2c/i2cvar.h>
#include <dev/clock_subr.h>
extern void (*cpuresetfn)(void);
extern void (*powerdownfn)(void);
/* Registers */
#define EVENT_A 0x06
#define CONTROL_F 0x13
#define CONTROL_F_WAKE_UP (1 << 2)
#define CONTROL_F_SHUTDOWN (1 << 1)
#define COUNT_S 0x40
#define COUNT_S_COUNT_SEC 0x3f
#define COUNT_MI 0x41
#define COUNT_MI_COUNT_MIN 0x3f
#define COUNT_H 0x42
#define COUNT_H_COUNT_HOUR 0x1f
#define COUNT_D 0x43
#define COUNT_D_COUNT_DAY 0x1f
#define COUNT_MO 0x44
#define COUNT_MO_COUNT_MONTH 0x0f
#define COUNT_Y 0x45
#define COUNT_Y_MONITOR (1 << 6)
#define COUNT_Y_COUNT_YEAR 0x3f
#define ALARM_MO 0x4a
#define ALARM_MO_TICK_WAKE (1 << 5)
#define ALARM_MO_TICK_TYPE (1 << 4)
#define ALARM_Y 0x4b
#define ALARM_Y_TICK_ON (1 << 7)
struct dapmic_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
struct todr_chip_handle sc_todr;
};
int dapmic_match(struct device *, void *, void *);
void dapmic_attach(struct device *, struct device *, void *);
struct cfattach dapmic_ca = {
sizeof(struct dapmic_softc), dapmic_match, dapmic_attach
};
struct cfdriver dapmic_cd = {
NULL, "dapmic", DV_DULL
};
uint8_t dapmic_reg_read(struct dapmic_softc *, int);
void dapmic_reg_write(struct dapmic_softc *, int, uint8_t);
int dapmic_clock_read(struct dapmic_softc *, struct clock_ymdhms *);
int dapmic_clock_write(struct dapmic_softc *, struct clock_ymdhms *);
int dapmic_gettime(struct todr_chip_handle *, struct timeval *);
int dapmic_settime(struct todr_chip_handle *, struct timeval *);
void dapmic_reset(void);
void dapmic_powerdown(void);
int
dapmic_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
return (strcmp(ia->ia_name, "dlg,da9063") == 0);
}
void
dapmic_attach(struct device *parent, struct device *self, void *aux)
{
struct dapmic_softc *sc = (struct dapmic_softc *)self;
struct i2c_attach_args *ia = aux;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
sc->sc_todr.cookie = sc;
sc->sc_todr.todr_gettime = dapmic_gettime;
sc->sc_todr.todr_settime = dapmic_settime;
todr_attach(&sc->sc_todr);
printf("\n");
if (cpuresetfn == NULL)
cpuresetfn = dapmic_reset;
if (powerdownfn == NULL)
powerdownfn = dapmic_powerdown;
}
uint8_t
dapmic_reg_read(struct dapmic_softc *sc, int reg)
{
uint8_t cmd = reg;
uint8_t val;
int error;
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
&cmd, sizeof cmd, &val, sizeof val, I2C_F_POLL);
iic_release_bus(sc->sc_tag, I2C_F_POLL);
if (error) {
printf("%s: can't read register 0x%02x\n",
sc->sc_dev.dv_xname, reg);
val = 0xff;
}
return val;
}
void
dapmic_reg_write(struct dapmic_softc *sc, int reg, uint8_t val)
{
uint8_t cmd = reg;
int error;
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
error = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
&cmd, sizeof cmd, &val, sizeof val, I2C_F_POLL);
iic_release_bus(sc->sc_tag, I2C_F_POLL);
if (error) {
printf("%s: can't write register 0x%02x\n",
sc->sc_dev.dv_xname, reg);
}
}
int
dapmic_clock_read(struct dapmic_softc *sc, struct clock_ymdhms *dt)
{
uint8_t regs[6];
uint8_t cmd = COUNT_S;
int error;
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
&cmd, sizeof(cmd), regs, sizeof(regs), I2C_F_POLL);
iic_release_bus(sc->sc_tag, I2C_F_POLL);
if (error)
return error;
dt->dt_sec = (regs[0] & COUNT_S_COUNT_SEC);
dt->dt_min = (regs[1] & COUNT_MI_COUNT_MIN);
dt->dt_hour = (regs[2] & COUNT_H_COUNT_HOUR);
dt->dt_day = (regs[3] & COUNT_D_COUNT_DAY);
dt->dt_mon = (regs[4] & COUNT_MO_COUNT_MONTH);
dt->dt_year = (regs[5] & COUNT_Y_COUNT_YEAR) + 2000;
/* Consider the time to be invalid if the MONITOR bit isn't set. */
if ((regs[5] & COUNT_Y_MONITOR) == 0)
return EINVAL;
return 0;
}
int
dapmic_clock_write(struct dapmic_softc *sc, struct clock_ymdhms *dt)
{
uint8_t regs[6];
uint8_t cmd = COUNT_S;
int error;
regs[0] = dt->dt_sec;
regs[1] = dt->dt_min;
regs[2] = dt->dt_hour;
regs[3] = dt->dt_day;
regs[4] = dt->dt_mon;
regs[5] = (dt->dt_year - 2000) | COUNT_Y_MONITOR;
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
error = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
&cmd, sizeof(cmd), regs, sizeof(regs), I2C_F_POLL);
iic_release_bus(sc->sc_tag, I2C_F_POLL);
if (error)
return error;
return 0;
}
int
dapmic_gettime(struct todr_chip_handle *handle, struct timeval *tv)
{
struct dapmic_softc *sc = handle->cookie;
struct clock_ymdhms dt;
int error;
error = dapmic_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
dapmic_settime(struct todr_chip_handle *handle, struct timeval *tv)
{
struct dapmic_softc *sc = handle->cookie;
struct clock_ymdhms dt;
clock_secs_to_ymdhms(tv->tv_sec, &dt);
return dapmic_clock_write(sc, &dt);
}
void
dapmic_reset(void)
{
struct dapmic_softc *sc = dapmic_cd.cd_devs[0];
uint8_t reg;
/* Enable tick alarm wakeup with a one second interval. */
reg = dapmic_reg_read(sc, ALARM_MO);
reg &= ~ALARM_MO_TICK_TYPE;
reg |= ALARM_MO_TICK_WAKE;
dapmic_reg_write(sc, ALARM_MO, reg);
/* Enable tick function. */
reg = dapmic_reg_read(sc, ALARM_Y);
reg |= ALARM_Y_TICK_ON;
dapmic_reg_write(sc, ALARM_Y, reg);
/* Clear events such that we wake up again. */
dapmic_reg_write(sc, EVENT_A, dapmic_reg_read(sc, EVENT_A));
dapmic_reg_write(sc, CONTROL_F, CONTROL_F_SHUTDOWN);
}
void
dapmic_powerdown(void)
{
struct dapmic_softc *sc = dapmic_cd.cd_devs[0];
uint8_t reg;
/* Disable tick function such that it doesn't wake us up. */
reg = dapmic_reg_read(sc, ALARM_Y);
reg &= ~ALARM_Y_TICK_ON;
dapmic_reg_write(sc, ALARM_Y, reg);
dapmic_reg_write(sc, CONTROL_F, CONTROL_F_SHUTDOWN);
}
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