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