Author: jmcneill
Date: Sun Feb 28 17:42:27 2016
New Revision: 296161
URL: https://svnweb.freebsd.org/changeset/base/296161
Log:
Add Allwinner A10/A20 RTC driver.
Submitted by: Vladimir Belian <fate10 at gmail.com>
Reviewed by: andrew, imp, jmcneill
Approved by: gonzo (mentor)
Differential Revision: https://reviews.freebsd.org/D5414
Added:
head/sys/arm/allwinner/aw_rtc.c (contents, props changed)
Modified:
head/sys/arm/allwinner/files.allwinner
Added: head/sys/arm/allwinner/aw_rtc.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/arm/allwinner/aw_rtc.c Sun Feb 28 17:42:27 2016 (r296161)
@@ -0,0 +1,272 @@
+/*-
+ * Copyright (c) 2016 Vladimir Belian <fate10 at gmail.com>
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/time.h>
+#include <sys/rman.h>
+#include <sys/clock.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/resource.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <arm/allwinner/allwinner_machdep.h>
+
+#include "clock_if.h"
+
+#define LOSC_CTRL_REG 0x00
+#define RTC_DATE_REG 0x04
+#define RTC_TIME_REG 0x08
+
+#define TIME_MASK 0x001f3f3f
+
+#define LOSC_OSC_SRC 0x00000001
+#define LOSC_GSM 0x00000008
+#define LOSC_AUTO_SW_EN 0x00004000
+#define LOSC_MAGIC 0x16aa0000
+#define LOSC_BUSY_MASK 0x00000380
+
+#define IS_SUN7I (allwinner_soc_family() == ALLWINNERSOC_SUN7I)
+
+#define YEAR_MIN (IS_SUN7I ? 1970 : 2010)
+#define YEAR_MAX (IS_SUN7I ? 2100 : 2073)
+#define YEAR_OFFSET (IS_SUN7I ? 1900 : 2010)
+#define YEAR_MASK (IS_SUN7I ? 0xff : 0x3f)
+#define LEAP_BIT (IS_SUN7I ? 24 : 22)
+
+#define GET_SEC_VALUE(x) ((x) & 0x0000003f)
+#define GET_MIN_VALUE(x) (((x) & 0x00003f00) >> 8)
+#define GET_HOUR_VALUE(x) (((x) & 0x001f0000) >> 16)
+#define GET_DAY_VALUE(x) ((x) & 0x0000001f)
+#define GET_MON_VALUE(x) (((x) & 0x00000f00) >> 8)
+#define GET_YEAR_VALUE(x) (((x) >> 16) & YEAR_MASK)
+
+#define SET_DAY_VALUE(x) GET_DAY_VALUE(x)
+#define SET_MON_VALUE(x) (((x) & 0x0000000f) << 8)
+#define SET_YEAR_VALUE(x) (((x) & YEAR_MASK) << 16)
+#define SET_LEAP_VALUE(x) (((x) & 0x00000001) << LEAP_BIT)
+#define SET_SEC_VALUE(x) GET_SEC_VALUE(x)
+#define SET_MIN_VALUE(x) (((x) & 0x0000003f) << 8)
+#define SET_HOUR_VALUE(x) (((x) & 0x0000001f) << 16)
+
+#define HALF_OF_SEC_NS 500000000
+#define RTC_RES_US 1000000
+#define RTC_TIMEOUT 70
+
+#define RTC_READ(sc, reg) bus_read_4((sc)->res, (reg))
+#define RTC_WRITE(sc, reg, val) bus_write_4((sc)->res, (reg), (val))
+
+#define IS_LEAP_YEAR(y) \
+ (((y) % 400) == 0 || (((y) % 100) != 0 && ((y) % 4) == 0))
+
+
+static struct ofw_compat_data compat_data[] = {
+ { "allwinner,sun4i-a10-rtc", true },
+ { "allwinner,sun7i-a20-rtc", true },
+ { NULL, false }
+};
+
+struct aw_rtc_softc {
+ struct resource *res;
+};
+
+static int aw_rtc_probe(device_t dev);
+static int aw_rtc_attach(device_t dev);
+static int aw_rtc_detach(device_t dev);
+
+static int aw_rtc_gettime(device_t dev, struct timespec *ts);
+static int aw_rtc_settime(device_t dev, struct timespec *ts);
+
+static device_method_t aw_rtc_methods[] = {
+ DEVMETHOD(device_probe, aw_rtc_probe),
+ DEVMETHOD(device_attach, aw_rtc_attach),
+ DEVMETHOD(device_detach, aw_rtc_detach),
+
+ DEVMETHOD(clock_gettime, aw_rtc_gettime),
+ DEVMETHOD(clock_settime, aw_rtc_settime),
+
+ DEVMETHOD_END
+};
+
+static driver_t aw_rtc_driver = {
+ "rtc",
+ aw_rtc_methods,
+ sizeof(struct aw_rtc_softc),
+};
+
+static devclass_t aw_rtc_devclass;
+
+EARLY_DRIVER_MODULE(aw_rtc, simplebus, aw_rtc_driver, aw_rtc_devclass, 0, 0,
+ BUS_PASS_TIMER + BUS_PASS_ORDER_MIDDLE);
+
+
+static int
+aw_rtc_probe(device_t dev)
+{
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+
+ if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
+ return (ENXIO);
+
+ device_set_desc(dev, "Allwinner RTC");
+
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+aw_rtc_attach(device_t dev)
+{
+ struct aw_rtc_softc *sc = device_get_softc(dev);
+ uint32_t val;
+ int rid = 0;
+
+ sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
+ if (!sc->res) {
+ device_printf(dev, "could not allocate resources\n");
+ return (ENXIO);
+ }
+
+ val = RTC_READ(sc, LOSC_CTRL_REG);
+ val &= ~LOSC_AUTO_SW_EN;
+ val |= LOSC_MAGIC | LOSC_GSM | LOSC_OSC_SRC;
+ RTC_WRITE(sc, LOSC_CTRL_REG, val);
+
+ DELAY(100);
+
+ val = RTC_READ(sc, LOSC_CTRL_REG);
+ if ((val & LOSC_OSC_SRC) == 0) {
+ bus_release_resource(dev, SYS_RES_MEMORY, rid, sc->res);
+ device_printf(dev, "set LOSC to external failed\n");
+ return (ENXIO);
+ }
+
+ clock_register(dev, RTC_RES_US);
+
+ return (0);
+}
+
+static int
+aw_rtc_detach(device_t dev)
+{
+ /* can't support detach, since there's no clock_unregister function */
+ return (EBUSY);
+}
+
+static int
+aw_rtc_gettime(device_t dev, struct timespec *ts)
+{
+ struct aw_rtc_softc *sc = device_get_softc(dev);
+ struct clocktime ct;
+ uint32_t rdate, rtime;
+
+ rdate = RTC_READ(sc, RTC_DATE_REG);
+ rtime = RTC_READ(sc, RTC_TIME_REG);
+
+ if ((rtime & TIME_MASK) == 0)
+ rdate = RTC_READ(sc, RTC_DATE_REG);
+
+ ct.sec = GET_SEC_VALUE(rtime);
+ ct.min = GET_MIN_VALUE(rtime);
+ ct.hour = GET_HOUR_VALUE(rtime);
+ ct.day = GET_DAY_VALUE(rdate);
+ ct.mon = GET_MON_VALUE(rdate);
+ ct.year = GET_YEAR_VALUE(rdate) + YEAR_OFFSET;
+ ct.dow = -1;
+ /* RTC resolution is 1 sec */
+ ct.nsec = 0;
+
+ return (clock_ct_to_ts(&ct, ts));
+}
+
+static int
+aw_rtc_settime(device_t dev, struct timespec *ts)
+{
+ struct aw_rtc_softc *sc = device_get_softc(dev);
+ struct clocktime ct;
+ uint32_t clk, rdate, rtime;
+
+ /* RTC resolution is 1 sec */
+ if (ts->tv_nsec >= HALF_OF_SEC_NS)
+ ts->tv_sec++;
+ ts->tv_nsec = 0;
+
+ clock_ts_to_ct(ts, &ct);
+
+ if ((ct.year < YEAR_MIN) || (ct.year > YEAR_MAX)) {
+ device_printf(dev, "could not set time, year out of range\n");
+ return (EINVAL);
+ }
+
+ for (clk = 0; RTC_READ(sc, LOSC_CTRL_REG) & LOSC_BUSY_MASK; clk++) {
+ if (clk > RTC_TIMEOUT) {
+ device_printf(dev, "could not set time, RTC busy\n");
+ return (EINVAL);
+ }
+ DELAY(1);
+ }
+ /* reset time register to avoid unexpected date increment */
+ RTC_WRITE(sc, RTC_TIME_REG, 0);
+
+ rdate = SET_DAY_VALUE(ct.day) | SET_MON_VALUE(ct.mon) |
+ SET_YEAR_VALUE(ct.year - YEAR_OFFSET) |
+ SET_LEAP_VALUE(IS_LEAP_YEAR(ct.year));
+
+ rtime = SET_SEC_VALUE(ct.sec) | SET_MIN_VALUE(ct.min) |
+ SET_HOUR_VALUE(ct.hour);
+
+ for (clk = 0; RTC_READ(sc, LOSC_CTRL_REG) & LOSC_BUSY_MASK; clk++) {
+ if (clk > RTC_TIMEOUT) {
+ device_printf(dev, "could not set date, RTC busy\n");
+ return (EINVAL);
+ }
+ DELAY(1);
+ }
+ RTC_WRITE(sc, RTC_DATE_REG, rdate);
+
+ for (clk = 0; RTC_READ(sc, LOSC_CTRL_REG) & LOSC_BUSY_MASK; clk++) {
+ if (clk > RTC_TIMEOUT) {
+ device_printf(dev, "could not set time, RTC busy\n");
+ return (EINVAL);
+ }
+ DELAY(1);
+ }
+ RTC_WRITE(sc, RTC_TIME_REG, rtime);
+
+ DELAY(RTC_TIMEOUT);
+
+ return (0);
+}
Modified: head/sys/arm/allwinner/files.allwinner
==============================================================================
--- head/sys/arm/allwinner/files.allwinner Sun Feb 28 16:21:53 2016 (r296160)
+++ head/sys/arm/allwinner/files.allwinner Sun Feb 28 17:42:27 2016 (r296161)
@@ -10,6 +10,7 @@ arm/allwinner/a10_ehci.c optional ehci
arm/allwinner/a10_gpio.c optional gpio
arm/allwinner/a10_mmc.c optional mmc
arm/allwinner/a10_sramc.c standard
+arm/allwinner/aw_rtc.c standard
arm/allwinner/aw_wdog.c standard
arm/allwinner/a20/a20_cpu_cfg.c standard
arm/allwinner/allwinner_machdep.c standard