Add generic USB PHY driver

sys/dev/fdt/files.fdt

@@ -1,4 +1,4 @@
-# $NetBSD: files.fdt,v 1.46 2019/10/27 15:31:15 jmcneill Exp $
+# $NetBSD: files.fdt,v 1.47 2019/10/30 21:37:56 jmcneill Exp $
 
 include	"external/bsd/libfdt/conf/files.libfdt"
 
@@ -153,3 +153,8 @@ file	dev/fdt/amdccp_fdt.c			amdccp_fdt
 # Arasan SDHCI controller
 attach	sdhc at fdt with arasan_sdhc_fdt
 file	dev/fdt/arasan_sdhc_fdt.c		arasan_sdhc_fdt
+
+# Generic USB PHY
+device	usbnopphy
+attach	usbnopphy at fdt
+file	dev/fdt/usbnopphy.c			usbnopphy

sys/dev/fdt/usbnopphy.c

@@ -0,0 +1,140 @@
+/* $NetBSD: usbnopphy.c,v 1.1 2019/10/30 21:37:56 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2019 Jared McNeill <jmcneill@invisible.ca>
+ * All rights reserved.
+ *
+ * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#include <sys/cdefs.h>
+
+__KERNEL_RCSID(0, "$NetBSD: usbnopphy.c,v 1.1 2019/10/30 21:37:56 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/device.h>
+#include <sys/intr.h>
+#include <sys/systm.h>
+#include <sys/time.h>
+
+#include <dev/fdt/fdtvar.h>
+
+static int usbnopphy_match(device_t, cfdata_t, void *);
+static void usbnopphy_attach(device_t, device_t, void *);
+
+static const char * const compatible[] = {
+	"usb-nop-xceiv",
+	NULL
+};
+
+struct usbnopphy_softc {
+	device_t		sc_dev;
+
+	struct clk		*sc_clk;
+	struct fdtbus_regulator *sc_reg;
+	struct fdtbus_gpio_pin	*sc_pin_reset;
+	struct fdtbus_gpio_pin	*sc_pin_vbus_det;
+};
+
+CFATTACH_DECL_NEW(usbnopphy, sizeof(struct usbnopphy_softc),
+	usbnopphy_match, usbnopphy_attach, NULL, NULL);
+
+static void *
+usbnopphy_acquire(device_t dev, const void *data, size_t len)
+{
+	struct usbnopphy_softc * const sc = device_private(dev);
+
+	return sc;
+}
+
+static void
+usbnopphy_release(device_t dev, void *priv)
+{
+}
+
+static int
+usbnopphy_enable(device_t dev, void *priv, bool enable)
+{
+	struct usbnopphy_softc * const sc = device_private(dev);
+	int error;
+
+	if (enable) {
+		if (sc->sc_reg != NULL) {
+			error = fdtbus_regulator_enable(sc->sc_reg);
+			if (error != 0)
+				return error;
+		}
+		if (sc->sc_clk != NULL) {
+			error = clk_enable(sc->sc_clk);
+			if (error != 0)
+				return error;
+		}
+		if (sc->sc_pin_reset != NULL) {
+			fdtbus_gpio_write(sc->sc_pin_reset, 1);
+			delay(20000);
+			fdtbus_gpio_write(sc->sc_pin_reset, 0);
+		}
+	} else {
+		if (sc->sc_pin_reset != NULL)
+			fdtbus_gpio_write(sc->sc_pin_reset, 1);
+		if (sc->sc_reg != NULL)
+			fdtbus_regulator_disable(sc->sc_reg);
+		if (sc->sc_clk != NULL)
+			clk_disable(sc->sc_clk);
+	}
+
+	return 0;
+}
+
+const struct fdtbus_phy_controller_func usbnopphy_funcs = {
+	.acquire = usbnopphy_acquire,
+	.release = usbnopphy_release,
+	.enable = usbnopphy_enable,
+};
+
+static int
+usbnopphy_match(device_t parent, cfdata_t cf, void *aux)
+{
+	struct fdt_attach_args * const faa = aux;
+
+	return of_match_compatible(faa->faa_phandle, compatible);
+}
+
+static void
+usbnopphy_attach(device_t parent, device_t self, void *aux)
+{
+	struct usbnopphy_softc * const sc = device_private(self);
+	struct fdt_attach_args * const faa = aux;
+	const int phandle = faa->faa_phandle;
+
+	sc->sc_dev = self;
+
+	sc->sc_reg = fdtbus_regulator_acquire(phandle, "vbus-regulator");
+	sc->sc_clk = fdtbus_clock_get(phandle, "main_clk");
+	sc->sc_pin_reset = fdtbus_gpio_acquire(phandle, "reset-gpios", GPIO_PIN_OUTPUT);
+
+	aprint_naive("\n");
+	aprint_normal(": USB PHY\n");
+
+	fdtbus_register_phy_controller(self, phandle, &usbnopphy_funcs);
+}