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[src/trunk]: src/sys/arch Add RTC driver.
details: https://anonhg.NetBSD.org/src/rev/9acfaae1c317
branches: trunk
changeset: 825083:9acfaae1c317
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Thu Jun 29 19:38:24 2017 +0000
description:
Add RTC driver.
diffstat:
sys/arch/arm/sunxi/files.sunxi | 7 +-
sys/arch/arm/sunxi/sunxi_rtc.c | 174 +++++++++++++++++++++++++++++++++++++++++
sys/arch/evbarm/conf/SUNXI | 3 +-
3 files changed, 182 insertions(+), 2 deletions(-)
diffs (217 lines):
diff -r c17d4bc928ca -r 9acfaae1c317 sys/arch/arm/sunxi/files.sunxi
--- a/sys/arch/arm/sunxi/files.sunxi Thu Jun 29 19:16:08 2017 +0000
+++ b/sys/arch/arm/sunxi/files.sunxi Thu Jun 29 19:38:24 2017 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.sunxi,v 1.4 2017/06/29 19:16:08 jmcneill Exp $
+# $NetBSD: files.sunxi,v 1.5 2017/06/29 19:38:24 jmcneill Exp $
#
# Configuration info for Allwinner sunxi family SoCs
#
@@ -57,6 +57,11 @@
attach sunxitwi at fdt with sunxi_twi
file arch/arm/sunxi/sunxi_twi.c sunxi_twi
+# RTC
+device sunxirtc
+attach sunxirtc at fdt with sunxi_rtc
+file arch/arm/sunxi/sunxi_rtc.c sunxi_rtc
+
# SOC parameters
defflag opt_soc.h SOC_SUNXI
defflag opt_soc.h SOC_SUN8I: SOC_SUNXI
diff -r c17d4bc928ca -r 9acfaae1c317 sys/arch/arm/sunxi/sunxi_rtc.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/sunxi/sunxi_rtc.c Thu Jun 29 19:38:24 2017 +0000
@@ -0,0 +1,174 @@
+/* $NetBSD: sunxi_rtc.c,v 1.1 2017/06/29 19:38:24 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2014-2017 Jared McNeill <jmcneill%invisible.ca@localhost>
+ * 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 ``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 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>
+__KERNEL_RCSID(0, "$NetBSD: sunxi_rtc.c,v 1.1 2017/06/29 19:38:24 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/device.h>
+#include <sys/intr.h>
+#include <sys/systm.h>
+#include <sys/mutex.h>
+
+#include <dev/clock_subr.h>
+
+#include <dev/fdt/fdtvar.h>
+
+#define RTC_YY_MM_DD_REG 0x10
+#define SUNXI_RTC_LEAP __BIT(22)
+#define SUNXI_RTC_YEAR __BITS(21,16)
+#define SUNXI_RTC_MONTH __BITS(11,8)
+#define SUNXI_RTC_DAY __BITS(4,0)
+#define RTC_HH_MM_SS_REG 0x14
+#define SUNXI_RTC_WK_NO __BITS(31,29)
+#define SUNXI_RTC_HOUR __BITS(20,16)
+#define SUNXI_RTC_MINUTE __BITS(13,8)
+#define SUNXI_RTC_SECOND __BITS(5,0)
+
+#define SUNXI_RTC_BASE_YEAR 2000
+
+static const char * const compatible[] = {
+ "allwinner,sun6i-a31-rtc",
+ NULL
+};
+
+struct sunxi_rtc_softc {
+ device_t sc_dev;
+ bus_space_tag_t sc_bst;
+ bus_space_handle_t sc_bsh;
+ struct todr_chip_handle sc_todr;
+};
+
+#define RTC_READ(sc, reg) \
+ bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
+#define RTC_WRITE(sc, reg, val) \
+ bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
+
+static int sunxi_rtc_match(device_t, cfdata_t, void *);
+static void sunxi_rtc_attach(device_t, device_t, void *);
+
+static int sunxi_rtc_gettime(todr_chip_handle_t, struct clock_ymdhms *);
+static int sunxi_rtc_settime(todr_chip_handle_t, struct clock_ymdhms *);
+
+CFATTACH_DECL_NEW(sunxi_rtc, sizeof(struct sunxi_rtc_softc),
+ sunxi_rtc_match, sunxi_rtc_attach, NULL, NULL);
+
+static int
+sunxi_rtc_match(device_t parent, cfdata_t cf, void *aux)
+{
+ struct fdt_attach_args * const faa = aux;
+
+ return of_match_compatible(faa->faa_phandle, compatible);
+}
+
+static void
+sunxi_rtc_attach(device_t parent, device_t self, void *aux)
+{
+ struct sunxi_rtc_softc * const sc = device_private(self);
+ struct fdt_attach_args * const faa = aux;
+ const int phandle = faa->faa_phandle;
+ bus_addr_t addr;
+ bus_size_t size;
+
+ if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
+ aprint_error(": couldn't get registers\n");
+ return;
+ }
+
+ sc->sc_dev = self;
+ sc->sc_bst = faa->faa_bst;
+ if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) {
+ aprint_error(": couldn't map registers\n");
+ return;
+ }
+
+ aprint_naive("\n");
+ aprint_normal(": RTC\n");
+
+ sc->sc_todr.todr_gettime_ymdhms = sunxi_rtc_gettime;
+ sc->sc_todr.todr_settime_ymdhms = sunxi_rtc_settime;
+ sc->sc_todr.cookie = sc;
+
+ fdtbus_todr_attach(self, phandle, &sc->sc_todr);
+}
+
+static int
+sunxi_rtc_gettime(todr_chip_handle_t tch, struct clock_ymdhms *dt)
+{
+ struct sunxi_rtc_softc *sc = tch->cookie;
+
+ const uint32_t yymmdd = RTC_READ(sc, RTC_YY_MM_DD_REG);
+ const uint32_t hhmmss = RTC_READ(sc, RTC_HH_MM_SS_REG);
+
+ dt->dt_year = __SHIFTOUT(yymmdd, SUNXI_RTC_YEAR) + SUNXI_RTC_BASE_YEAR;
+ dt->dt_mon = __SHIFTOUT(yymmdd, SUNXI_RTC_MONTH);
+ dt->dt_day = __SHIFTOUT(yymmdd, SUNXI_RTC_DAY);
+ dt->dt_wday = __SHIFTOUT(hhmmss, SUNXI_RTC_WK_NO);
+ dt->dt_hour = __SHIFTOUT(hhmmss, SUNXI_RTC_HOUR);
+ dt->dt_min = __SHIFTOUT(hhmmss, SUNXI_RTC_MINUTE);
+ dt->dt_sec = __SHIFTOUT(hhmmss, SUNXI_RTC_SECOND);
+
+ return 0;
+}
+
+static int
+sunxi_rtc_settime(todr_chip_handle_t tch, struct clock_ymdhms *dt)
+{
+ struct sunxi_rtc_softc *sc = tch->cookie;
+ uint32_t yymmdd, hhmmss, maxyear;
+
+ /*
+ * Sanity check the date before writing it back
+ */
+ if (dt->dt_year < SUNXI_RTC_BASE_YEAR) {
+ aprint_normal_dev(sc->sc_dev, "year pre the epoch: %llu, "
+ "not writing back time\n", dt->dt_year);
+ return EIO;
+ }
+ maxyear = __SHIFTOUT(0xffffffff, SUNXI_RTC_YEAR) + SUNXI_RTC_BASE_YEAR;
+ if (dt->dt_year > maxyear) {
+ aprint_normal_dev(sc->sc_dev, "year exceeds available field:"
+ " %llu, not writing back time\n", dt->dt_year);
+ return EIO;
+ }
+
+ yymmdd = __SHIFTIN(dt->dt_year - SUNXI_RTC_BASE_YEAR, SUNXI_RTC_YEAR);
+ yymmdd |= __SHIFTIN(dt->dt_mon, SUNXI_RTC_MONTH);
+ yymmdd |= __SHIFTIN(dt->dt_day, SUNXI_RTC_DAY);
+
+ hhmmss = __SHIFTIN(dt->dt_wday, SUNXI_RTC_WK_NO);
+ hhmmss |= __SHIFTIN(dt->dt_hour, SUNXI_RTC_HOUR);
+ hhmmss |= __SHIFTIN(dt->dt_min, SUNXI_RTC_MINUTE);
+ hhmmss |= __SHIFTIN(dt->dt_sec, SUNXI_RTC_SECOND);
+
+ RTC_WRITE(sc, RTC_YY_MM_DD_REG, yymmdd);
+ RTC_WRITE(sc, RTC_HH_MM_SS_REG, hhmmss);
+
+ return 0;
+}
diff -r c17d4bc928ca -r 9acfaae1c317 sys/arch/evbarm/conf/SUNXI
--- a/sys/arch/evbarm/conf/SUNXI Thu Jun 29 19:16:08 2017 +0000
+++ b/sys/arch/evbarm/conf/SUNXI Thu Jun 29 19:38:24 2017 +0000
@@ -1,5 +1,5 @@
#
-# $NetBSD: SUNXI,v 1.5 2017/06/29 19:16:08 jmcneill Exp $
+# $NetBSD: SUNXI,v 1.6 2017/06/29 19:38:24 jmcneill Exp $
#
# Allwinner sunxi family
#
@@ -90,6 +90,7 @@
iic* at sunxitwi?
# RTC
+sunxirtc* at fdt? # RTC
# SDMMC
sunximmc* at fdt? # SDMMC
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