Add driver for JZ4780 RTC device.
Only support basic timekeeping for now.
This commit is contained in:
parent
32d7412741
commit
72565e644e
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=310493
@ -21,6 +21,7 @@ mips/ingenic/jz4780_machdep.c standard
|
||||
mips/ingenic/jz4780_nemc.c standard
|
||||
mips/ingenic/jz4780_pdma.c standard
|
||||
mips/ingenic/jz4780_pinctrl.c standard
|
||||
mips/ingenic/jz4780_rtc.c standard
|
||||
mips/ingenic/jz4780_timer.c standard
|
||||
|
||||
# Sound
|
||||
|
234
sys/mips/ingenic/jz4780_rtc.c
Normal file
234
sys/mips/ingenic/jz4780_rtc.c
Normal file
@ -0,0 +1,234 @@
|
||||
/*-
|
||||
* Copyright 2016 Alexander Kabaev <kan@FreeBSD.org>
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Ingenic JZ4780 RTC driver
|
||||
*
|
||||
*/
|
||||
|
||||
#include <sys/cdefs.h>
|
||||
__FBSDID("$FreeBSD$");
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/conf.h>
|
||||
#include <sys/clock.h>
|
||||
#include <sys/bus.h>
|
||||
#include <sys/kernel.h>
|
||||
#include <sys/module.h>
|
||||
#include <sys/resource.h>
|
||||
|
||||
#include <machine/bus.h>
|
||||
|
||||
#include <dev/ofw/ofw_bus.h>
|
||||
#include <dev/ofw/ofw_bus_subr.h>
|
||||
|
||||
#include "clock_if.h"
|
||||
|
||||
#define JZ_RTC_TIMEOUT 5000
|
||||
|
||||
#define JZ_RTCCR 0x00
|
||||
# define JZ_RTCCR_WRDY (1u << 7)
|
||||
#define JZ_RTSR 0x04
|
||||
#define JZ_HSPR 0x34
|
||||
#define JZ_WENR 0x3C
|
||||
# define JZ_WENR_PAT 0xa55a
|
||||
# define JZ_WENR_WEN (1u <<31)
|
||||
|
||||
struct jz4780_rtc_softc {
|
||||
device_t dev;
|
||||
struct resource *res[2];
|
||||
};
|
||||
|
||||
static struct resource_spec jz4780_rtc_spec[] = {
|
||||
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
|
||||
{ SYS_RES_IRQ, 0, RF_ACTIVE },
|
||||
{ -1, 0 }
|
||||
};
|
||||
|
||||
#define CSR_READ(sc, reg) bus_read_4((sc)->res[0], (reg))
|
||||
#define CSR_WRITE(sc, reg, val) bus_write_4((sc)->res[0], (reg), (val))
|
||||
|
||||
static int jz4780_rtc_probe(device_t dev);
|
||||
static int jz4780_rtc_attach(device_t dev);
|
||||
static int jz4780_rtc_detach(device_t dev);
|
||||
|
||||
static int
|
||||
jz4780_rtc_probe(device_t dev)
|
||||
{
|
||||
|
||||
if (!ofw_bus_status_okay(dev))
|
||||
return (ENXIO);
|
||||
|
||||
if (!ofw_bus_is_compatible(dev, "ingenic,jz4780-rtc"))
|
||||
return (ENXIO);
|
||||
|
||||
device_set_desc(dev, "JZ4780 RTC");
|
||||
|
||||
return (BUS_PROBE_DEFAULT);
|
||||
}
|
||||
|
||||
/* Poll control register until RTC is ready to accept register writes */
|
||||
static int
|
||||
jz4780_rtc_wait(struct jz4780_rtc_softc *sc)
|
||||
{
|
||||
int timeout;
|
||||
|
||||
timeout = JZ_RTC_TIMEOUT;
|
||||
while (timeout-- > 0) {
|
||||
if (CSR_READ(sc, JZ_RTCCR) & JZ_RTCCR_WRDY)
|
||||
return (0);
|
||||
}
|
||||
return (EIO);
|
||||
}
|
||||
|
||||
/*
|
||||
* Write RTC register. It appears that RTC goes into read-only mode at random,
|
||||
* which suggests something is up with how it is powered up, so do the pattern
|
||||
* writing dance every time just in case.
|
||||
*/
|
||||
static int
|
||||
jz4780_rtc_write(struct jz4780_rtc_softc *sc, uint32_t reg, uint32_t val)
|
||||
{
|
||||
int ret, timeout;
|
||||
|
||||
ret = jz4780_rtc_wait(sc);
|
||||
if (ret != 0)
|
||||
return (ret);
|
||||
|
||||
CSR_WRITE(sc, JZ_WENR, JZ_WENR_PAT);
|
||||
|
||||
ret = jz4780_rtc_wait(sc);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
timeout = JZ_RTC_TIMEOUT;
|
||||
while (timeout-- > 0) {
|
||||
if (CSR_READ(sc, JZ_WENR) & JZ_WENR_WEN)
|
||||
break;
|
||||
}
|
||||
if (timeout < 0)
|
||||
return (EIO);
|
||||
|
||||
CSR_WRITE(sc, reg, val);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
jz4780_rtc_attach(device_t dev)
|
||||
{
|
||||
struct jz4780_rtc_softc *sc = device_get_softc(dev);
|
||||
uint32_t scratch;
|
||||
int ret;
|
||||
|
||||
sc->dev = dev;
|
||||
|
||||
if (bus_alloc_resources(dev, jz4780_rtc_spec, sc->res)) {
|
||||
device_printf(dev, "could not allocate resources for device\n");
|
||||
return (ENXIO);
|
||||
}
|
||||
|
||||
scratch = CSR_READ(sc, JZ_HSPR);
|
||||
if (scratch != 0x12345678) {
|
||||
ret = jz4780_rtc_write(sc, JZ_HSPR, 0x12345678);
|
||||
if (ret == 0)
|
||||
ret = jz4780_rtc_write(sc, JZ_RTSR, 0);
|
||||
if (ret) {
|
||||
device_printf(dev, "Unable to write RTC registers\n");
|
||||
jz4780_rtc_detach(dev);
|
||||
return (ret);
|
||||
}
|
||||
}
|
||||
clock_register(dev, 1000000); /* Register 1 HZ clock */
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
jz4780_rtc_detach(device_t dev)
|
||||
{
|
||||
struct jz4780_rtc_softc *sc;
|
||||
|
||||
sc = device_get_softc(dev);
|
||||
bus_release_resources(dev, jz4780_rtc_spec, sc->res);
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
jz4780_rtc_gettime(device_t dev, struct timespec *ts)
|
||||
{
|
||||
struct jz4780_rtc_softc *sc;
|
||||
uint32_t val1, val2;
|
||||
int timeout;
|
||||
|
||||
sc = device_get_softc(dev);
|
||||
|
||||
timeout = JZ_RTC_TIMEOUT;
|
||||
val2 = CSR_READ(sc, JZ_RTSR);
|
||||
do {
|
||||
val1 = val2;
|
||||
val2 = CSR_READ(sc, JZ_RTSR);
|
||||
} while (val1 != val2 && timeout-- >= 0);
|
||||
|
||||
if (timeout < 0)
|
||||
return (EIO);
|
||||
|
||||
/* Convert secs to timespec directly */
|
||||
ts->tv_sec = val1;
|
||||
ts->tv_nsec = 0;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
jz4780_rtc_settime(device_t dev, struct timespec *ts)
|
||||
{
|
||||
struct jz4780_rtc_softc *sc;
|
||||
|
||||
sc = device_get_softc(dev);
|
||||
return jz4780_rtc_write(sc, JZ_RTSR, ts->tv_sec);
|
||||
}
|
||||
|
||||
static device_method_t jz4780_rtc_methods[] = {
|
||||
/* Device interface */
|
||||
DEVMETHOD(device_probe, jz4780_rtc_probe),
|
||||
DEVMETHOD(device_attach, jz4780_rtc_attach),
|
||||
DEVMETHOD(device_detach, jz4780_rtc_detach),
|
||||
|
||||
DEVMETHOD(clock_gettime, jz4780_rtc_gettime),
|
||||
DEVMETHOD(clock_settime, jz4780_rtc_settime),
|
||||
|
||||
DEVMETHOD_END
|
||||
};
|
||||
|
||||
static driver_t jz4780_rtc_driver = {
|
||||
"jz4780_rtc",
|
||||
jz4780_rtc_methods,
|
||||
sizeof(struct jz4780_rtc_softc),
|
||||
};
|
||||
|
||||
static devclass_t jz4780_rtc_devclass;
|
||||
|
||||
EARLY_DRIVER_MODULE(jz4780_rtc, simplebus, jz4780_rtc_driver,
|
||||
jz4780_rtc_devclass, 0, 0, BUS_PASS_TIMER + BUS_PASS_ORDER_MIDDLE);
|
Loading…
Reference in New Issue
Block a user