From 46b99dcbf2a6d50337addecbcf72e949bf5a0c99 Mon Sep 17 00:00:00 2001
From: kettenis <kettenis@openbsd.org>
Date: Mon, 27 Aug 2018 14:12:59 +0000
Subject: [PATCH] Add hirest(4), a driver to support reset signal controller
 blocks on HiSilicon SoCs.

---
 sys/dev/fdt/files.fdt |  6 ++-
 sys/dev/fdt/hireset.c | 93 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 98 insertions(+), 1 deletion(-)
 create mode 100644 sys/dev/fdt/hireset.c

diff --git a/sys/dev/fdt/files.fdt b/sys/dev/fdt/files.fdt
index 66d67870b46..d2efbb9c507 100644
--- a/sys/dev/fdt/files.fdt
+++ b/sys/dev/fdt/files.fdt
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.fdt,v 1.71 2018/08/27 13:56:11 kettenis Exp $
+#	$OpenBSD: files.fdt,v 1.72 2018/08/27 14:12:59 kettenis Exp $
 #
 # Config file and device description for machine-independent FDT code.
 # Included by ports that need it.
@@ -123,6 +123,10 @@ device	hidwusb: fdt
 attach	hidwusb at fdt
 file	dev/fdt/hidwusb.c		hidwusb
 
+device	hireset
+attach	hireset at fdt
+file	dev/fdt/hireset.c		hireset
+
 device	rkclock
 attach	rkclock at fdt
 file	dev/fdt/rkclock.c		rkclock
diff --git a/sys/dev/fdt/hireset.c b/sys/dev/fdt/hireset.c
new file mode 100644
index 00000000000..1be7086415c
--- /dev/null
+++ b/sys/dev/fdt/hireset.c
@@ -0,0 +1,93 @@
+/*	$OpenBSD: hireset.c,v 1.1 2018/08/27 14:12:59 kettenis Exp $	*/
+/*
+ * Copyright (c) 2018 Mark Kettenis <kettenis@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/intr.h>
+#include <machine/bus.h>
+#include <machine/fdt.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_clock.h>
+#include <dev/ofw/ofw_misc.h>
+#include <dev/ofw/fdt.h>
+
+struct hireset_softc {
+	struct device		sc_dev;
+	uint32_t		sc_rst_syscon;
+
+	struct reset_device	sc_rd;
+};
+
+int hireset_match(struct device *, void *, void *);
+void hireset_attach(struct device *, struct device *, void *);
+
+struct cfattach	hireset_ca = {
+	sizeof (struct hireset_softc), hireset_match, hireset_attach
+};
+
+struct cfdriver hireset_cd = {
+	NULL, "hireset", DV_DULL
+};
+
+void	hireset_reset(void *, uint32_t *, int);
+
+int
+hireset_match(struct device *parent, void *match, void *aux)
+{
+	struct fdt_attach_args *faa = aux;
+
+	return OF_is_compatible(faa->fa_node, "hisilicon,hi3660-reset");
+}
+
+void
+hireset_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct hireset_softc *sc = (struct hireset_softc *)self;
+	struct fdt_attach_args *faa = aux;
+
+	sc->sc_rst_syscon = OF_getpropint(faa->fa_node, "hisi,rst-syscon", 0);
+
+	printf("\n");
+
+	sc->sc_rd.rd_node = faa->fa_node;
+	sc->sc_rd.rd_cookie = sc;
+	sc->sc_rd.rd_reset = hireset_reset;
+	reset_register(&sc->sc_rd);
+}
+
+void
+hireset_reset(void *cookie, uint32_t *cells, int on)
+{
+	struct hireset_softc *sc = cookie;
+	struct regmap *rm;
+	uint32_t offset = cells[0];
+	uint32_t bit = cells[1];
+
+	rm = regmap_byphandle(sc->sc_rst_syscon);
+	if (rm == NULL) {
+		printf("%s: can't find regmap\n", sc->sc_dev.dv_xname);
+		return;
+	}
+
+	if (on)
+		regmap_write_4(rm, offset + 0, (1 << bit));
+	else
+		regmap_write_4(rm, offset + 4, (1 << bit));
+}
-- 
2.20.1