powerpc: Add AmigaOne platform, a subclass of MPC85xx

Summary:
The AmigaOne platform, encompassing the X5000 and A1222 at this time, is
based on the mpc85xx platform, but includes some things not listed in
the device tree.  Some custom devices, like CPLD, could be added to the
device tree with an overlay, or other means.  However, some cannot
easily be done, such as the power button interrupt.

The directory will also become a location to add AmigaOne platform drivers,
such as the aforementioned CPLD, and its children.

Reviewed by:	bdragon
Differential Revision:	https://reviews.freebsd.org/D21829

sys/conf/files.powerpc

@@ -107,6 +107,7 @@ powerpc/aim/moea64_if.m		optional	aim
 powerpc/aim/moea64_native.c	optional	aim
 powerpc/aim/mp_cpudep.c		optional	aim
 powerpc/aim/slb.c		optional	aim powerpc64
+powerpc/amigaone/platform_amigaone.c	optional	amigaone
 powerpc/booke/locore.S		optional	booke no-obj
 powerpc/booke/booke_machdep.c	optional	booke
 powerpc/booke/machdep_e500.c	optional	booke_e500

sys/conf/options.powerpc

@@ -20,6 +20,8 @@ GFB_NO_FONT_LOADING	opt_gfb.h
 GFB_NO_MODE_CHANGE	opt_gfb.h
 
 MOEA64_STATS		opt_pmap.h
+AMIGAONE		opt_platform.h
+MIKROTIK		opt_platform.h
 MPC85XX			opt_platform.h
 POWERMAC		opt_platform.h
 PS3			opt_platform.h
@@ -35,4 +37,3 @@ OFWCONS_POLL_HZ		opt_ofw.h
 # AGP debugging support
 AGP_DEBUG		opt_agp.h
 
-MIKROTIK

sys/powerpc/amigaone/platform_amigaone.c

@@ -0,0 +1,123 @@
+/*-
+ * Copyright (c) 2019 Justin Hibbits
+ *
+ * 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 ``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 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>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+#include <sys/malloc.h>
+#include <sys/smp.h>
+
+#include <machine/intr_machdep.h>
+#include <machine/platform.h>
+#include <machine/platformvar.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+
+#include <powerpc/mpc85xx/mpc85xx.h>
+
+#include "platform_if.h"
+
+static void aeon_pbutton_intr(void *_unused);
+static void aeon_setup_intr(void *unused);
+
+static int aeon_probe(platform_t);
+static int aeon_attach(platform_t);
+
+static platform_method_t aeon_methods[] = {
+	PLATFORMMETHOD(platform_probe,		aeon_probe),
+	PLATFORMMETHOD(platform_attach,		aeon_attach),
+	PLATFORMMETHOD_END
+};
+
+DEFINE_CLASS_1(aeon, aeon_platform, aeon_methods, 0, mpc85xx_platform);
+
+PLATFORM_DEF(aeon_platform);
+
+static bool is_aeon;
+
+static int
+aeon_probe(platform_t plat)
+{
+	phandle_t rootnode;
+	char model[32];
+
+	rootnode = OF_finddevice("/");
+
+	if (OF_getprop(rootnode, "model", model, sizeof(model)) > 0) {
+		if (strncmp(model, "varisys,", strlen("varisys,")) == 0)
+			return (BUS_PROBE_SPECIFIC);
+	}
+
+	return (ENXIO);
+}
+
+static int
+aeon_attach(platform_t plat)
+{
+	int error;
+
+	error = mpc85xx_attach(plat);
+	if (error)
+		return (error);
+
+	is_aeon = true;
+
+	return (0);
+}
+
+/* Notify devd(8) that the power button was pressed (IRQ#4 on A-Eon machines). */
+static void
+aeon_pbutton_intr(void *_unused)
+{
+	devctl_notify("AEON", "power", "press", NULL);
+}
+
+/* Manually configure the power button IRQ handler. */
+static void
+aeon_setup_intr(void *unused)
+{
+	int irq;
+
+	if (!is_aeon)
+		return;
+
+	if (bootverbose)
+		printf("Configuring AmigaOne power button.\n");
+
+	irq = 4; /* From TRM, IRQ4 is raised when power button is pressed. */
+
+	/* Get us the root PIC. */
+	irq = MAP_IRQ(0, irq);
+	powerpc_config_intr(irq, INTR_TRIGGER_EDGE, INTR_POLARITY_LOW);
+	powerpc_setup_intr("power_button", irq, NULL, aeon_pbutton_intr, NULL,
+	    INTR_TYPE_MISC, NULL, 0);
+}
+
+SYSINIT(aeon_setup_intr, SI_SUB_CONFIGURE, SI_ORDER_ANY, aeon_setup_intr, NULL);