Introduce initial driver for PMSU on Armada38x

This is a stub for PMSU driver. Note that it cannot be used to set the
secondary core boot address during attach because drivers are attached
later than SI_SUB_CPU sysinit where cores are started.
Setting the boot address should be done manually in platform_mp_start_ap().

SMP is working fine with this commit and was enabled in Armada38x kernel
configuration file.

Obtained from:	Semihalf
Sponsored by:	Stormshield
Submitted by:	Michal Stanek <mst@semihalf.com>
Differential revision:  https://reviews.freebsd.org/D4427

sys/arm/conf/ARMADA38X

@@ -22,6 +22,8 @@ options 	ROOTDEVNAME=\"/dev/da0s1a\"
 options 	SCHED_ULE		# ULE scheduler
 #options 	SCHED_4BSD		# 4BSD scheduler
 
+options 	SMP
+
 # Debugging
 #options 	DEBUG
 #options 	VERBOSE_SYSINIT

sys/arm/mv/armada38x/armada38x_mp.c

@@ -41,6 +41,8 @@ __FBSDID("$FreeBSD$");
 
 #include <arm/mv/mvreg.h>
 
+#include "pmsu.h"
+
 int cpu_reset_deassert(void);
 
 int

sys/arm/mv/armada38x/files.armada38x

@@ -2,4 +2,5 @@
 
 arm/mv/armada38x/armada38x.c	standard
 arm/mv/armada38x/armada38x_mp.c	optional smp
+arm/mv/armada38x/pmsu.c		standard
 arm/mv/armada38x/rtc.c		standard

sys/arm/mv/armada38x/pmsu.c

@@ -0,0 +1,154 @@
+/*-
+ * Copyright (c) 2015 Semihalf.
+ * Copyright (c) 2015 Stormshield.
+ * 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 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/bus.h>
+#include <sys/conf.h>
+#include <sys/rman.h>
+#include <sys/types.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/resource.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+
+#include <machine/fdt.h>
+#include <machine/smp.h>
+
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <arm/mv/mvreg.h>
+
+#include "pmsu.h"
+
+static struct resource_spec pmsu_spec[] = {
+	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },
+	{ -1, 0 }
+};
+
+struct pmsu_softc {
+	device_t	dev;
+	struct resource	*res;
+};
+
+static int pmsu_probe(device_t dev);
+static int pmsu_attach(device_t dev);
+static int pmsu_detach(device_t dev);
+
+static device_method_t pmsu_methods[] = {
+	DEVMETHOD(device_probe,		pmsu_probe),
+	DEVMETHOD(device_attach,	pmsu_attach),
+	DEVMETHOD(device_detach,	pmsu_detach),
+
+	{ 0, 0 }
+};
+
+static driver_t pmsu_driver = {
+	"pmsu",
+	pmsu_methods,
+	sizeof(struct pmsu_softc)
+};
+
+static devclass_t pmsu_devclass;
+
+DRIVER_MODULE(pmsu, simplebus, pmsu_driver, pmsu_devclass, 0, 0);
+DRIVER_MODULE(pmsu, ofwbus, pmsu_driver, pmsu_devclass, 0, 0);
+
+static int
+pmsu_probe(device_t dev)
+{
+
+	if (!ofw_bus_status_okay(dev))
+		return (ENXIO);
+
+	if (!ofw_bus_is_compatible(dev, "marvell,armada-380-pmsu"))
+		return (ENXIO);
+
+	device_set_desc(dev, "Power Management Service Unit");
+
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+pmsu_attach(device_t dev)
+{
+	struct pmsu_softc *sc;
+	int err;
+
+	sc = device_get_softc(dev);
+	sc->dev = dev;
+
+	err = bus_alloc_resources(dev, pmsu_spec, &sc->res);
+	if (err != 0) {
+		device_printf(dev, "could not allocate resources\n");
+		return (ENXIO);
+	}
+
+	return (0);
+}
+
+static int
+pmsu_detach(device_t dev)
+{
+	struct pmsu_softc *sc;
+
+	sc = device_get_softc(dev);
+
+	bus_release_resources(dev, pmsu_spec, &sc->res);
+
+	return (0);
+}
+
+#ifdef SMP
+int
+pmsu_boot_secondary_cpu(void)
+{
+	bus_space_handle_t vaddr;
+	int rv;
+
+	rv = bus_space_map(fdtbus_bs_tag, (bus_addr_t)MV_PMSU_BASE, MV_PMSU_REGS_LEN,
+	    0, &vaddr);
+	if (rv != 0)
+		return (rv);
+
+	/* Boot cpu1 */
+	bus_space_write_4(fdtbus_bs_tag, vaddr, PMSU_BOOT_ADDR_REDIRECT_OFFSET(1),
+	    pmap_kextract((vm_offset_t)mpentry));
+
+	cpu_idcache_wbinv_all();
+	cpu_l2cache_wbinv_all();
+	armv7_sev();
+
+	bus_space_unmap(fdtbus_bs_tag, vaddr, MV_PMSU_REGS_LEN);
+
+	return (0);
+}
+#endif

sys/arm/mv/armada38x/pmsu.h

@@ -0,0 +1,35 @@
+/*-
+ * Copyright (c) 2015 Semihalf.
+ * Copyright (c) 2015 Stormshield.
+ * 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 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.
+ *
+ * $FreeBSD$
+ */
+
+#include "opt_global.h"
+
+#ifdef SMP
+/* Boot secondary core using PMSU */
+int pmsu_boot_secondary_cpu(void);
+#endif

sys/arm/mv/mvreg.h

@@ -468,6 +468,7 @@
 #define	MV_SCU_REG_CTRL		0x00
 #define	MV_SCU_REG_CONFIG	0x04
 #define	MV_SCU_ENABLE		1
+#define	SCU_CFG_REG_NCPU_MASK	0x3
 #endif
 
 /*