arm64: allwinner: Add aw_dwc3 driver

This is a simplebus like driver that just deal with clocks and resets
and attach the dwc3 child node.

MFC after:	1 month

3 files changed, 149 insertions, 0 deletions

diff --git a/sys/arm/allwinner/aw_dwc3.c b/sys/arm/allwinner/aw_dwc3.c
new file mode 100644
index 000000000000..97ec2cbe21b7
--- /dev/null
+++ b/sys/arm/allwinner/aw_dwc3.c
@@ -0,0 +1,147 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2019 Emmanuel Vadot <manu@FreeBSD.Org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Rockchip DWC3 glue
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/rman.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/gpio.h>
+#include <machine/bus.h>
+
+
+#include <dev/fdt/simplebus.h>
+
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include <dev/ofw/ofw_subr.h>
+
+#include <dev/extres/clk/clk.h>
+#include <dev/extres/hwreset/hwreset.h>
+#include <dev/extres/phy/phy_usb.h>
+
+static struct ofw_compat_data compat_data[] = {
+	{ "allwinner,sun50i-h6-dwc3",	1 },
+	{ NULL,				0 }
+};
+
+struct aw_dwc3_softc {
+	struct simplebus_softc	sc;
+	device_t		dev;
+	clk_t			clk_bus;
+	hwreset_t		rst_bus;
+};
+
+static int
+aw_dwc3_probe(device_t dev)
+{
+	phandle_t node;
+
+	if (!ofw_bus_status_okay(dev))
+		return (ENXIO);
+
+	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
+		return (ENXIO);
+
+	/* Binding says that we need a child node for the actual dwc3 controller */
+	node = ofw_bus_get_node(dev);
+	if (OF_child(node) <= 0)
+		return (ENXIO);
+
+	device_set_desc(dev, "Allwinner H6 DWC3");
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+aw_dwc3_attach(device_t dev)
+{
+	struct aw_dwc3_softc *sc;
+	device_t cdev;
+	phandle_t node, child;
+	int err;
+
+	sc = device_get_softc(dev);
+	sc->dev = dev;
+	node = ofw_bus_get_node(dev);
+
+	/* Enable the clocks */
+	if (clk_get_by_ofw_name(dev, 0, "bus", &sc->clk_bus) != 0) {
+		device_printf(dev, "Cannot get bus clock\n");
+		return (ENXIO);
+	}
+	err = clk_enable(sc->clk_bus);
+	if (err != 0) {
+		device_printf(dev, "Could not enable clock %s\n",
+		    clk_get_name(sc->clk_bus));
+		return (ENXIO);
+	}
+
+	/* Put module out of reset */
+	if (hwreset_get_by_ofw_name(dev, node, "bus", &sc->rst_bus) == 0) {
+		if (hwreset_deassert(sc->rst_bus) != 0) {
+			device_printf(dev, "Cannot deassert reset\n");
+			return (ENXIO);
+		}
+	}
+
+	simplebus_init(dev, node);
+	if (simplebus_fill_ranges(node, &sc->sc) < 0) {
+		device_printf(dev, "could not get ranges\n");
+		return (ENXIO);
+	}
+
+	for (child = OF_child(node); child > 0; child = OF_peer(child)) {
+		cdev = simplebus_add_device(dev, child, 0, NULL, -1, NULL);
+		if (cdev != NULL)
+			device_probe_and_attach(cdev);
+	}
+
+	return (bus_generic_attach(dev));
+}
+
+static device_method_t aw_dwc3_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		aw_dwc3_probe),
+	DEVMETHOD(device_attach,	aw_dwc3_attach),
+
+	DEVMETHOD_END
+};
+
+static devclass_t aw_dwc3_devclass;
+
+DEFINE_CLASS_1(aw_dwc3, aw_dwc3_driver, aw_dwc3_methods,
+    sizeof(struct aw_dwc3_softc), simplebus_driver);
+DRIVER_MODULE(aw_dwc3, simplebus, aw_dwc3_driver, aw_dwc3_devclass, 0, 0);
diff --git a/sys/arm64/conf/GENERIC b/sys/arm64/conf/GENERIC
index fac919565b88..fb9355d2c29f 100644
--- a/sys/arm64/conf/GENERIC
+++ b/sys/arm64/conf/GENERIC
@@ -211,6 +211,7 @@ device		ohci			# OHCI USB interface
 device		ehci			# EHCI USB interface (USB 2.0)
 device		ehci_mv			# Marvell EHCI USB interface
 device		xhci			# XHCI USB interface (USB 3.0)
+device		aw_dwc3			# Allwinner DWC3 controller
 device		usb			# USB Bus (required)
 device		ukbd			# Keyboard
 device		umass			# Disks/Mass storage - Requires scbus and da
diff --git a/sys/conf/files.arm64 b/sys/conf/files.arm64
index f970f6b95f9b..68f0f6c537b4 100644
--- a/sys/conf/files.arm64
+++ b/sys/conf/files.arm64
@@ -30,6 +30,7 @@ arm/allwinner/a10_codec.c	optional	sound a10_codec
 arm/allwinner/a31_dmac.c	optional	a31_dmac
 arm/allwinner/sunxi_dma_if.m	optional	a31_dmac
 arm/allwinner/aw_cir.c		optional	evdev aw_cir fdt
+arm/allwinner/aw_dwc3.c		optional	aw_dwc3 fdt
 arm/allwinner/aw_gpio.c		optional	gpio aw_gpio fdt
 arm/allwinner/aw_mmc.c		optional	mmc aw_mmc fdt | mmccam aw_mmc fdt
 arm/allwinner/aw_nmi.c		optional	aw_nmi fdt \