Move imxdog(4) to sys/dev/fdt.

ok kettenis@

2 files changed, 109 insertions, 1 deletions

diff --git a/sys/dev/fdt/files.fdt b/sys/dev/fdt/files.fdt
index 9e0c3a87322..f93b48c7939 100644
--- a/sys/dev/fdt/files.fdt
+++ b/sys/dev/fdt/files.fdt
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.fdt,v 1.151 2021/05/18 11:39:37 kettenis Exp $
+#	$OpenBSD: files.fdt,v 1.152 2021/05/28 11:50:18 patrick Exp $
 #
 # Config file and device description for machine-independent FDT code.
 # Included by ports that need it.
@@ -469,6 +469,10 @@ device	imxccm
 attach	imxccm at fdt
 file	dev/fdt/imxccm.c		imxccm
 
+device	imxdog
+attach	imxdog at fdt
+file	dev/fdt/imxdog.c		imxdog
+
 device	imxdwusb: fdt
 attach	imxdwusb at fdt
 file	dev/fdt/imxdwusb.c		imxdwusb
diff --git a/sys/dev/fdt/imxdog.c b/sys/dev/fdt/imxdog.c
new file mode 100644
index 00000000000..69663afe217
--- /dev/null
+++ b/sys/dev/fdt/imxdog.c
@@ -0,0 +1,104 @@
+/* $OpenBSD: imxdog.c,v 1.1 2021/05/28 11:50:18 patrick Exp $ */
+/*
+ * Copyright (c) 2012-2013 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 <armv7/armv7/armv7_machdep.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/fdt.h>
+
+/* registers */
+#define WCR		0x00
+#define WSR		0x02
+#define WRSR		0x04
+#define WICR		0x06
+#define WMCR		0x08
+
+struct imxdog_softc {
+	struct device		sc_dev;
+	bus_space_tag_t		sc_iot;
+	bus_space_handle_t	sc_ioh;
+};
+
+struct imxdog_softc *imxdog_sc;
+
+int	imxdog_match(struct device *, void *, void *);
+void	imxdog_attach(struct device *, struct device *, void *);
+void	imxdog_reset(void);
+
+struct cfattach	imxdog_ca = {
+	sizeof (struct imxdog_softc), imxdog_match, imxdog_attach
+};
+
+struct cfdriver imxdog_cd = {
+	NULL, "imxdog", DV_DULL
+};
+
+int
+imxdog_match(struct device *parent, void *match, void *aux)
+{
+	struct fdt_attach_args *faa = aux;
+
+	return OF_is_compatible(faa->fa_node, "fsl,imx21-wdt");
+}
+
+void
+imxdog_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct fdt_attach_args *faa = aux;
+	struct imxdog_softc *sc = (struct imxdog_softc *) self;
+
+	if (faa->fa_nreg < 1)
+		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))
+		panic("imxdog_attach: bus_space_map failed!");
+
+	printf("\n");
+
+	imxdog_sc = sc;
+	cpuresetfn = imxdog_reset;
+}
+
+void
+imxdog_reset(void)
+{
+	if (imxdog_sc == NULL)
+		return;
+
+	/* disable watchdog and set timeout to 0 */
+	bus_space_write_2(imxdog_sc->sc_iot, imxdog_sc->sc_ioh, WCR, 0);
+
+	/* sequence to reset timeout counter */
+	bus_space_write_2(imxdog_sc->sc_iot, imxdog_sc->sc_ioh, WSR, 0x5555);
+	bus_space_write_2(imxdog_sc->sc_iot, imxdog_sc->sc_ioh, WSR, 0xaaaa);
+
+	/* enable watchdog */
+	bus_space_write_2(imxdog_sc->sc_iot, imxdog_sc->sc_ioh, WCR, 1);
+	/* errata TKT039676 */
+	bus_space_write_2(imxdog_sc->sc_iot, imxdog_sc->sc_ioh, WCR, 1);
+
+	delay(100000);
+}