Add mvodog(4), a driver for the watchdog on the ARMADA 38x series.

ok kettenis@ patrick@

diff --git a/sys/arch/armv7/marvell/mvodog.c b/sys/arch/armv7/marvell/mvodog.c
new file mode 100644 (file)
index 0000000..89981a2
--- /dev/null
+++ b/sys/arch/armv7/marvell/mvodog.c
@@ -0,0 +1,105 @@
+/* $OpenBSD: mvodog.c,v 1.1 2023/03/02 09:56:52 jmatthew Exp $ */
+/*
+ * Copyright (c) 2022 Jonathan Matthew <jmatthew@openbsd.org>
+ *
+ * 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 WDT_ENABLE             (1 << 8)
+
+#define RSTOUT_ENABLE          (1 << 8)
+#define RSTOUT_MASK            (1 << 10)
+
+#define HREAD4(sc, ioh, reg)                                           \
+       (bus_space_read_4((sc)->sc_iot, (ioh), (reg)))
+#define HWRITE4(sc, ioh, reg, val)                                     \
+       bus_space_write_4((sc)->sc_iot, (ioh), (reg), (val))
+#define HSET4(sc, ioh, reg, bits)                                      \
+       HWRITE4((sc), (ioh), (reg), HREAD4((sc), (ioh), (reg)) | (bits))
+#define HCLR4(sc, ioh, reg, bits)                                      \
+       HWRITE4((sc), (ioh), (reg), HREAD4((sc), (ioh), (reg)) & ~(bits))
+
+struct mvodog_softc {
+       struct device            sc_dev;
+       bus_space_tag_t          sc_iot;
+       bus_space_handle_t       sc_reg_ioh;
+       bus_space_handle_t       sc_rstout_ioh;
+       bus_space_handle_t       sc_rstout_mask_ioh;
+};
+
+int     mvodog_match(struct device *, void *, void *);
+void    mvodog_attach(struct device *, struct device *, void *);
+
+const struct cfattach mvodog_ca = {
+       sizeof (struct mvodog_softc), mvodog_match, mvodog_attach
+};
+
+struct cfdriver mvodog_cd = {
+       NULL, "mvodog", DV_DULL
+};
+
+int
+mvodog_match(struct device *parent, void *cfdata, void *aux)
+{
+       struct fdt_attach_args *faa = aux;
+
+       return OF_is_compatible(faa->fa_node, "marvell,armada-380-wdt");
+}
+
+void
+mvodog_attach(struct device *parent, struct device *self, void *aux)
+{
+       struct mvodog_softc *sc = (struct mvodog_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_reg_ioh)) {
+               printf(": can't map registers\n");
+               return;
+       }
+
+       if (bus_space_map(sc->sc_iot, faa->fa_reg[1].addr,
+           faa->fa_reg[1].size, 0, &sc->sc_rstout_ioh)) {
+               printf(": can't map rstout\n");
+               return;
+       }
+
+       if (bus_space_map(sc->sc_iot, faa->fa_reg[2].addr,
+           faa->fa_reg[2].size, 0, &sc->sc_rstout_mask_ioh)) {
+               printf(": can't map rstout mask\n");
+               return;
+       }
+
+       printf("\n");
+
+       /* Disable watchdog timer. */
+       HSET4(sc, sc->sc_rstout_mask_ioh, 0, RSTOUT_MASK);
+       HCLR4(sc, sc->sc_rstout_ioh, 0, RSTOUT_ENABLE);
+       HCLR4(sc, sc->sc_reg_ioh, 0, WDT_ENABLE);
+}