Add mvdog(4), a driver to support the watchdog on the Armada 3700 SoC.

At the moment it only supports disabling the watchdog, which lets me
continue to work on the Turris Mox.

ok kettenis@

2 files changed, 107 insertions, 1 deletions

diff --git a/sys/dev/fdt/files.fdt b/sys/dev/fdt/files.fdt
index 94be22725fd..fcd8f77b4df 100644
--- a/sys/dev/fdt/files.fdt
+++ b/sys/dev/fdt/files.fdt
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.fdt,v 1.89 2019/09/01 16:01:43 kettenis Exp $
+#	$OpenBSD: files.fdt,v 1.90 2019/09/05 18:38:30 patrick Exp $
 #
 # Config file and device description for machine-independent FDT code.
 # Included by ports that need it.
@@ -230,6 +230,10 @@ device	mvclock
 attach	mvclock at fdt
 file	dev/fdt/mvclock.c		mvclock
 
+device	mvdog
+attach	mvdog at fdt
+file	dev/fdt/mvdog.c			mvdog
+
 device	mvgicp
 attach	mvgicp at fdt
 file	dev/fdt/mvgicp.c		mvgicp
diff --git a/sys/dev/fdt/mvdog.c b/sys/dev/fdt/mvdog.c
new file mode 100644
index 00000000000..cef0bfe1159
--- /dev/null
+++ b/sys/dev/fdt/mvdog.c
@@ -0,0 +1,102 @@
+/* $OpenBSD: mvdog.c,v 1.1 2019/09/05 18:38:30 patrick Exp $ */
+/*
+ * Copyright (c) 2019 Patrick Wildt <patrick@blueri.se>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <machine/bus.h>
+#include <machine/fdt.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_misc.h>
+#include <dev/ofw/fdt.h>
+
+#define CNTR_RETRIGGER		0
+#define CNTR_WDOG		1
+
+#define CNTR_CTRL(x)		((x) * 0x10)
+#define  CNTR_CTRL_ENABLE		(1 << 0)
+
+#define WDT_TIMER_SELECT	0x64
+
+#define HREAD4(sc, reg)							\
+	(bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
+#define HWRITE4(sc, reg, val)						\
+	bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
+#define HSET4(sc, reg, bits)						\
+	HWRITE4((sc), (reg), HREAD4((sc), (reg)) | (bits))
+#define HCLR4(sc, reg, bits)						\
+	HWRITE4((sc), (reg), HREAD4((sc), (reg)) & ~(bits))
+
+struct mvdog_softc {
+	struct device		 sc_dev;
+	bus_space_tag_t		 sc_iot;
+	bus_space_handle_t	 sc_ioh;
+	struct regmap		*sc_rm;
+};
+
+int	 mvdog_match(struct device *, void *, void *);
+void	 mvdog_attach(struct device *, struct device *, void *);
+
+struct cfattach mvdog_ca = {
+	sizeof (struct mvdog_softc), mvdog_match, mvdog_attach
+};
+
+struct cfdriver mvdog_cd = {
+	NULL, "mvdog", DV_DULL
+};
+
+int
+mvdog_match(struct device *parent, void *cfdata, void *aux)
+{
+	struct fdt_attach_args *faa = aux;
+
+	return OF_is_compatible(faa->fa_node, "marvell,armada-3700-wdt");
+}
+
+void
+mvdog_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct mvdog_softc *sc = (struct mvdog_softc *)self;
+	struct fdt_attach_args *faa = aux;
+
+	if (faa->fa_nreg < 1) {
+		printf(": no registers\n");
+		return;
+	}
+
+	sc->sc_iot = faa->fa_iot;
+	if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
+	    faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
+		printf(": can't map registers\n");
+		return;
+	}
+
+	sc->sc_rm = regmap_byphandle(OF_getpropint(faa->fa_node,
+	    "marvell,system-controller", 0));
+	if (sc->sc_rm == NULL) {
+		printf(": can't get regmap\n");
+		return;
+	}
+
+	printf("\n");
+
+	/* Disable watchdog timer. */
+	HCLR4(sc, CNTR_CTRL(CNTR_WDOG), CNTR_CTRL_ENABLE);
+	HCLR4(sc, CNTR_CTRL(CNTR_RETRIGGER), CNTR_CTRL_ENABLE);
+	regmap_write_4(sc->sc_rm, WDT_TIMER_SELECT, 0);
+}