Add amlreset(4), a driver to support reset signal controller blocks on

Amlogic SoCs.

ok patrick@

2 files changed, 115 insertions, 1 deletions

diff --git a/sys/dev/fdt/amlreset.c b/sys/dev/fdt/amlreset.c
new file mode 100644
index 00000000000..be0576e1676
--- /dev/null
+++ b/sys/dev/fdt/amlreset.c
@@ -0,0 +1,110 @@
+/*	$OpenBSD: amlreset.c,v 1.1 2019/08/26 09:42:31 kettenis Exp $	*/
+/*
+ * Copyright (c) 2019 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>
+
+#define RESET0_REGISTER		0x0000
+#define RESET0_MASK		0x003c
+#define RESET0_LEVEL		0x007c
+
+#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 amlreset_softc {
+	struct device		sc_dev;
+	bus_space_tag_t		sc_iot;
+	bus_space_handle_t	sc_ioh;
+
+	struct reset_device	sc_rd;
+};
+
+int amlreset_match(struct device *, void *, void *);
+void amlreset_attach(struct device *, struct device *, void *);
+
+struct cfattach	amlreset_ca = {
+	sizeof (struct amlreset_softc), amlreset_match, amlreset_attach
+};
+
+struct cfdriver amlreset_cd = {
+	NULL, "amlreset", DV_DULL
+};
+
+void	amlreset_reset(void *, uint32_t *, int);
+
+int
+amlreset_match(struct device *parent, void *match, void *aux)
+{
+	struct fdt_attach_args *faa = aux;
+
+	return OF_is_compatible(faa->fa_node, "amlogic,meson-axg-reset");
+}
+
+void
+amlreset_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct amlreset_softc *sc = (struct amlreset_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;
+	}
+
+	printf("\n");
+
+	sc->sc_rd.rd_node = faa->fa_node;
+	sc->sc_rd.rd_cookie = sc;
+	sc->sc_rd.rd_reset = amlreset_reset;
+	reset_register(&sc->sc_rd);
+}
+
+void
+amlreset_reset(void *cookie, uint32_t *cells, int assert)
+{
+	struct amlreset_softc *sc = cookie;
+	uint32_t bank = cells[0] / 32;
+	uint32_t bit = cells[0] % 32;
+
+	if (assert)
+		HCLR4(sc, RESET0_LEVEL + bank * 4, (1 << bit));
+	else
+		HSET4(sc, RESET0_LEVEL + bank * 4, (1 << bit));
+}
diff --git a/sys/dev/fdt/files.fdt b/sys/dev/fdt/files.fdt
index 4c917af706f..fcef486e89c 100644
--- a/sys/dev/fdt/files.fdt
+++ b/sys/dev/fdt/files.fdt
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.fdt,v 1.82 2019/08/26 09:10:22 kettenis Exp $
+#	$OpenBSD: files.fdt,v 1.83 2019/08/26 09:42:31 kettenis Exp $
 #
 # Config file and device description for machine-independent FDT code.
 # Included by ports that need it.
@@ -126,6 +126,10 @@ device	syscon: fdt
 attach	syscon at fdt
 file	dev/fdt/syscon.c		syscon
 
+device	amlreset
+attach	amlreset at fdt
+file	dev/fdt/amlreset.c		amlreset
+
 device	amluart
 attach	amluart at fdt
 file	dev/fdt/amluart.c		amluart