Basic Lego Mindstorms EV3 support

sys/arch/arm/dts/da850-lego-ev3.dts

@@ -0,0 +1,42 @@
+/* $NetBSD $ */
+
+/*-
+ * Copyright (c) 2026 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Yuri Honegger.
+ *
+ * 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 "../../../external/gpl2/dts/dist/arch/arm/boot/dts/ti/davinci/da850-lego-ev3.dts"
+
+/ {
+	chosen {
+		stdout-path = &serial1;
+	};
+
+	arm {
+		compatible = "simple-bus";
+	};
+};

sys/arch/arm/imx/imx23_timrot.c

@@ -78,7 +78,7 @@ static const struct device_compatible_entry compat_data[] = {
 	DEVICE_COMPAT_EOL
 };
 
-static struct imx23_timrot_softc *timer_sc;
+static struct imx23_timrot_softc *timer_sc = NULL;
 
 #define TIMROT_SOFT_RST_LOOP 455 /* At least 1 us ... */
 #define TIMROT_READ(sc, reg)						\
@@ -197,9 +197,11 @@ setstatclockrate(int newhz)
 {
 	struct imx23_timrot_softc *sc = timer_sc;
 
-	TIMER_WRITE_2(sc, HW_TIMROT_TIMCOUNT1,
-		      __SHIFTIN(SOURCE_32KHZ_HZ / newhz - 1,
-				HW_TIMROT_TIMCOUNT1_FIXED_COUNT));
+	if(sc != NULL) {
+		TIMER_WRITE_2(sc, HW_TIMROT_TIMCOUNT1,
+			      __SHIFTIN(SOURCE_32KHZ_HZ / newhz - 1,
+					HW_TIMROT_TIMCOUNT1_FIXED_COUNT));
+	}
 }
 
 /*

sys/arch/arm/ti/am18_aclk.c

@@ -0,0 +1,193 @@
+/* $NetBSD $ */
+
+/*-
+* Copyright (c) 2026 The NetBSD Foundation, Inc.
+* All rights reserved.
+*
+* This code is derived from software contributed to The NetBSD Foundation
+* by Yuri Honegger.
+*
+* 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.
+ */
+
+/*
+ * Drivers for the async clock gates in the syscfg block of the TI AM1808.
+ */
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/cdefs.h>
+#include <sys/device.h>
+
+#include <dev/clk/clk_backend.h>
+#include <dev/fdt/fdtvar.h>
+#include <dev/fdt/syscon.h>
+
+#include <arm/fdt/arm_fdtvar.h>
+
+struct am18_aclk_config {
+	struct clk *clk; /* double wrap clk because the config must be const */
+	uint32_t mask;
+};
+
+struct am18_aclk_softc {
+	struct clk_domain sc_clkdom;
+	const struct am18_aclk_config *sc_config;
+	struct clk *sc_parent_clk;
+};
+
+static int	am18_aclk_match(device_t, cfdata_t, void *);
+static void	am18_aclk_attach(device_t, device_t, void *);
+static struct clk * am18_aclk_decode(device_t, int, const void *, size_t);
+static struct clk * am18_aclk_clk_get(void *, const char *);
+static u_int am18_aclk_clk_get_rate(void *, struct clk *);
+static struct clk * am18_aclk_clk_get_parent(void *, struct clk *);
+
+CFATTACH_DECL_NEW(am18aclk, sizeof(struct am18_aclk_softc),
+		  am18_aclk_match, am18_aclk_attach, NULL, NULL);
+
+#define AM18_ACLK_CFGCHIP3 0xC
+#define AM18_ACLK_CFGCHIP3_ASYNC3_CLKSRC __BIT(4)
+#define AM18_ACLK_CFGCHIP3_ASYNC1_CLKSRC __BIT(2)
+
+static struct clk am18_aclk_async1_clk = {
+	.name = "async1",
+	.flags = 0
+};
+static struct clk am18_aclk_async3_clk = {
+	.name = "async3",
+	.flags = 0
+};
+
+static const struct am18_aclk_config am18_aclk_async1_config = {
+	.clk = &am18_aclk_async1_clk,
+	.mask = AM18_ACLK_CFGCHIP3_ASYNC1_CLKSRC,
+};
+static const struct am18_aclk_config am18_aclk_async3_config = {
+	.clk = &am18_aclk_async3_clk,
+	.mask = AM18_ACLK_CFGCHIP3_ASYNC3_CLKSRC,
+};
+
+static const struct fdtbus_clock_controller_func am18_aclk_clk_fdt_funcs = {
+	.decode = am18_aclk_decode,
+};
+
+static const struct clk_funcs am18_aclk_clk_funcs = {
+	.get = am18_aclk_clk_get,
+	.get_rate = am18_aclk_clk_get_rate,
+	.get_parent = am18_aclk_clk_get_parent,
+};
+
+static const struct device_compatible_entry compat_data[] = {
+	{ .compat = "ti,da850-async1-clksrc",
+	  .data = &am18_aclk_async1_config },
+	{ .compat = "ti,da850-async3-clksrc",
+	  .data = &am18_aclk_async3_config },
+	DEVICE_COMPAT_EOL
+};
+
+static struct clk *
+am18_aclk_clk_get(void *priv, const char *name)
+{
+	struct am18_aclk_softc * const sc = priv;
+
+	if (strcmp(sc->sc_config->clk->name, name) == 0) {
+		return sc->sc_config->clk;
+	}
+
+	return NULL;
+}
+
+static u_int
+am18_aclk_clk_get_rate(void *priv, struct clk *clkp)
+{
+	struct am18_aclk_softc * const sc = priv;
+
+	return clk_get_rate(sc->sc_parent_clk);
+}
+
+static struct clk *
+am18_aclk_clk_get_parent(void *priv, struct clk *clkp)
+{
+	struct am18_aclk_softc * const sc = priv;
+
+	return sc->sc_parent_clk;
+}
+
+static struct clk *
+am18_aclk_decode(device_t dev, int cc_phandle, const void *data, size_t len)
+{
+	struct am18_aclk_softc * const sc = device_private(dev);
+
+	return sc->sc_config->clk;
+}
+
+int
+am18_aclk_match(device_t parent, cfdata_t cf, void *aux)
+{
+	struct fdt_attach_args * const faa = aux;
+
+	return of_compatible_match(faa->faa_phandle, compat_data);
+}
+
+void
+am18_aclk_attach(device_t parent, device_t self, void *aux)
+{
+	struct am18_aclk_softc * const sc = device_private(self);
+	struct fdt_attach_args * const faa = aux;
+	const int phandle = faa->faa_phandle;
+
+	sc->sc_config = of_compatible_lookup(phandle, compat_data)->data;
+
+	/* ensure we have a clock parent */
+	sc->sc_parent_clk = fdtbus_clock_get_index(phandle, 0);
+	if (sc->sc_parent_clk == NULL) {
+		aprint_error(": couldn't get parent clock");
+		return;
+	}
+
+	/* ensure clock gate bits are as expected */
+	struct syscon *syscon = fdtbus_syscon_lookup(OF_parent(phandle));
+	if (syscon == NULL) {
+		aprint_error(": couldn't get syscon registers\n");
+		return;
+	}
+	syscon_lock(syscon);
+	uint32_t cfgchip_reg3 = syscon_read_4(syscon, AM18_ACLK_CFGCHIP3);
+	syscon_unlock(syscon);
+	if ((cfgchip_reg3 & sc->sc_config->mask) != 0) {
+		aprint_error(": unexpected clock gate bits\n");
+		return;
+	}
+
+	/* attach a clock controller */
+	sc->sc_clkdom.name = device_xname(self);
+	sc->sc_clkdom.funcs = &am18_aclk_clk_funcs;
+	sc->sc_clkdom.priv = sc;
+
+	sc->sc_config->clk->domain = &sc->sc_clkdom;
+	clk_attach(sc->sc_config->clk);
+
+	fdtbus_register_clock_controller(self, phandle, &am18_aclk_clk_fdt_funcs);
+
+	aprint_normal("\n");
+}