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[src/trunk]: src/sys/arch Add driver for Meson GX EE-domain watchdog timer.
details: https://anonhg.NetBSD.org/src/rev/f669444164d1
branches: trunk
changeset: 456065:f669444164d1
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Sun Apr 21 13:51:04 2019 +0000
description:
Add driver for Meson GX EE-domain watchdog timer.
diffstat:
sys/arch/arm/amlogic/files.meson | 9 +-
sys/arch/arm/amlogic/mesongx_wdt.c | 172 +++++++++++++++++++++++++++++++++++++
sys/arch/evbarm/conf/GENERIC64 | 3 +-
3 files changed, 181 insertions(+), 3 deletions(-)
diffs (221 lines):
diff -r c04adb154d5c -r f669444164d1 sys/arch/arm/amlogic/files.meson
--- a/sys/arch/arm/amlogic/files.meson Sun Apr 21 13:49:47 2019 +0000
+++ b/sys/arch/arm/amlogic/files.meson Sun Apr 21 13:51:04 2019 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: files.meson,v 1.8 2019/04/21 11:02:32 jmcneill Exp $
+# $NetBSD: files.meson,v 1.9 2019/04/21 13:51:04 jmcneill Exp $
#
# Configuration info for Amlogic Meson family SoCs
#
@@ -104,11 +104,16 @@
attach gxlphy at mii
file arch/arm/amlogic/gxlphy.c gxlphy
-# Watchdog
+# Meson8b Watchdog
device mesonwdt: sysmon_wdog
attach mesonwdt at fdt with meson_wdt
file arch/arm/amlogic/meson_wdt.c meson_wdt
+# Meson GX Watchdog
+device mesongxwdt: sysmon_wdog
+attach mesongxwdt at fdt with mesongx_wdt
+file arch/arm/amlogic/mesongx_wdt.c mesongx_wdt
+
# SOC parameters
defflag opt_soc.h SOC_MESON
defflag opt_soc.h SOC_MESON8B: SOC_MESON
diff -r c04adb154d5c -r f669444164d1 sys/arch/arm/amlogic/mesongx_wdt.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/amlogic/mesongx_wdt.c Sun Apr 21 13:51:04 2019 +0000
@@ -0,0 +1,172 @@
+/* $NetBSD: mesongx_wdt.c,v 1.1 2019/04/21 13:51:04 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2019 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: mesongx_wdt.c,v 1.1 2019/04/21 13:51:04 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/cpu.h>
+#include <sys/device.h>
+#include <sys/wdog.h>
+
+#include <dev/sysmon/sysmonvar.h>
+
+#include <dev/fdt/fdtvar.h>
+
+#define CBUS_REG(x) ((x) << 2)
+
+#define WATCHDOG_CNTL CBUS_REG(0)
+#define CNTL_CLK_DIV_EN __BIT(25)
+#define CNTL_CLK_EN __BIT(24)
+#define CNTL_SYS_RESET_N_EN __BIT(21)
+#define CNTL_WATCHDOG_EN __BIT(18)
+#define CNTL_CLK_DIV_TCNT __BITS(17,0)
+#define WATCHDOG_CNTL1 CBUS_REG(1)
+#define WATCHDOG_TCNT CBUS_REG(2)
+#define WATCHDOG_RESET CBUS_REG(3)
+
+#define WATCHDOG_PERIOD_DEFAULT 8
+#define WATCHDOG_PERIOD_MAX 8
+
+static const char * compatible[] = {
+ "amlogic,meson-gx-wdt",
+ NULL
+};
+
+struct mesongx_wdt_softc {
+ device_t sc_dev;
+ bus_space_tag_t sc_bst;
+ bus_space_handle_t sc_bsh;
+
+ struct sysmon_wdog sc_wdog;
+ u_int sc_rate;
+};
+
+#define WDT_READ(sc, reg) \
+ bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
+#define WDT_WRITE(sc, reg, val) \
+ bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
+
+static int
+mesongx_wdt_setmode(struct sysmon_wdog *smw)
+{
+ struct mesongx_wdt_softc * const sc = smw->smw_cookie;
+
+ if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
+ WDT_WRITE(sc, WATCHDOG_CNTL, 0);
+ return 0;
+ }
+
+ if (smw->smw_period == WDOG_PERIOD_DEFAULT) {
+ sc->sc_wdog.smw_period = WATCHDOG_PERIOD_DEFAULT;
+ } else if (smw->smw_period == 0 ||
+ smw->smw_period > WATCHDOG_PERIOD_MAX) {
+ return EINVAL;
+ } else {
+ sc->sc_wdog.smw_period = smw->smw_period;
+ }
+
+ const u_int tcnt = sc->sc_rate / 1000;
+
+ WDT_WRITE(sc, WATCHDOG_CNTL, 0);
+ WDT_WRITE(sc, WATCHDOG_RESET, 0);
+ WDT_WRITE(sc, WATCHDOG_TCNT, sc->sc_wdog.smw_period * 1000);
+ WDT_WRITE(sc, WATCHDOG_CNTL,
+ __SHIFTIN(tcnt, CNTL_CLK_DIV_TCNT) |
+ CNTL_CLK_DIV_EN | CNTL_CLK_EN |
+ CNTL_SYS_RESET_N_EN | CNTL_WATCHDOG_EN);
+
+ return 0;
+}
+
+static int
+mesongx_wdt_tickle(struct sysmon_wdog *smw)
+{
+ struct mesongx_wdt_softc * const sc = smw->smw_cookie;
+
+ WDT_WRITE(sc, WATCHDOG_RESET, 0);
+
+ return 0;
+}
+
+static int
+mesongx_wdt_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
+mesongx_wdt_attach(device_t parent, device_t self, void *aux)
+{
+ struct mesongx_wdt_softc * const sc = device_private(self);
+ struct fdt_attach_args * const faa = aux;
+ const int phandle = faa->faa_phandle;
+ struct clk *clk;
+ 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(": EE-watchdog\n");
+
+ clk = fdtbus_clock_get_index(phandle, 0);
+ if (clk != NULL)
+ sc->sc_rate = clk_get_rate(clk);
+ else {
+ aprint_error_dev(self, "WARNING: couldn't get xtal clock, assuming 24 MHz\n");
+ sc->sc_rate = 24000000;
+ }
+
+ /* Disable watchdog */
+ WDT_WRITE(sc, WATCHDOG_CNTL, 0);
+
+ /* Register watchdog */
+ sc->sc_wdog.smw_name = "EE-watchdog";
+ sc->sc_wdog.smw_setmode = mesongx_wdt_setmode;
+ sc->sc_wdog.smw_tickle = mesongx_wdt_tickle;
+ sc->sc_wdog.smw_period = WATCHDOG_PERIOD_DEFAULT;
+ sc->sc_wdog.smw_cookie = sc;
+ sysmon_wdog_register(&sc->sc_wdog);
+}
+
+CFATTACH_DECL_NEW(mesongx_wdt, sizeof(struct mesongx_wdt_softc),
+ mesongx_wdt_match, mesongx_wdt_attach, NULL, NULL);
diff -r c04adb154d5c -r f669444164d1 sys/arch/evbarm/conf/GENERIC64
--- a/sys/arch/evbarm/conf/GENERIC64 Sun Apr 21 13:49:47 2019 +0000
+++ b/sys/arch/evbarm/conf/GENERIC64 Sun Apr 21 13:51:04 2019 +0000
@@ -1,5 +1,5 @@
#
-# $NetBSD: GENERIC64,v 1.88 2019/04/21 11:02:33 jmcneill Exp $
+# $NetBSD: GENERIC64,v 1.89 2019/04/21 13:51:04 jmcneill Exp $
#
# GENERIC ARM (aarch64) kernel
#
@@ -179,6 +179,7 @@
tegratimer* at fdt? # Timers
# Watchdog
+mesongxwdt* at fdt? # Amlogic Meson GX watchdog
sbsawdt* at acpi? # ARM SBSA-compliant watchdog
sunxiwdt* at fdt? # Allwinner watchdog
watchdog* at fdt? # Broadcom BCM283x watchdog
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