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Date:      Sun, 12 Apr 2015 13:00:59 +0000 (UTC)
From:      Andrew Turner <andrew@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r281466 - in head/sys: arm/conf conf dev/psci
Message-ID:  <201504121300.t3CD0xk7083878@svn.freebsd.org>

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Author: andrew
Date: Sun Apr 12 13:00:58 2015
New Revision: 281466
URL: https://svnweb.freebsd.org/changeset/base/281466

Log:
  Add a driver for the ARM Power State Coordination Interface (PSCI). This
  handles versions 0.1 and 0.2 of the standard on 32-bit ARM.
  
  With this driver we can shutdown in QEMU. Further work is needed to
  turn secondary cores on on boot and to support later revisions of the
  specification.
  
  Submitted by:	Robin Randhawa <Robin.Randhawa at ARM.com>
  Sponsored by:	The FreeBSD Foundation

Added:
  head/sys/dev/psci/
  head/sys/dev/psci/psci.c   (contents, props changed)
  head/sys/dev/psci/psci.h   (contents, props changed)
  head/sys/dev/psci/psci_arm.S   (contents, props changed)
Modified:
  head/sys/arm/conf/VIRT
  head/sys/conf/files.arm

Modified: head/sys/arm/conf/VIRT
==============================================================================
--- head/sys/arm/conf/VIRT	Sun Apr 12 12:31:19 2015	(r281465)
+++ head/sys/arm/conf/VIRT	Sun Apr 12 13:00:58 2015	(r281466)
@@ -82,6 +82,7 @@ device		uart
 device		pty
 device		snp
 device		pl011
+device		psci
 
 device		virtio                                                                                                                                           
 device		virtio_mmio                                                                                                                                      

Modified: head/sys/conf/files.arm
==============================================================================
--- head/sys/conf/files.arm	Sun Apr 12 12:31:19 2015	(r281465)
+++ head/sys/conf/files.arm	Sun Apr 12 13:00:58 2015	(r281466)
@@ -85,6 +85,8 @@ dev/fdt/fdt_arm_platform.c	optional	plat
 dev/hwpmc/hwpmc_arm.c		optional	hwpmc
 dev/hwpmc/hwpmc_armv7.c		optional	hwpmc armv6
 dev/kbd/kbd.c			optional	sc | vt
+dev/psci/psci.c			optional	psci
+dev/psci/psci_arm.S		optional	psci
 dev/syscons/scgfbrndr.c		optional	sc
 dev/syscons/scterm-teken.c	optional	sc
 dev/syscons/scvtb.c		optional	sc

Added: head/sys/dev/psci/psci.c
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ head/sys/dev/psci/psci.c	Sun Apr 12 13:00:58 2015	(r281466)
@@ -0,0 +1,286 @@
+/*-
+ * Copyright (c) 2014 Robin Randhawa
+ * 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.
+ *
+ */
+
+/*
+ * This implements support for ARM's Power State Co-ordination Interface
+ * [PSCI]. The implementation adheres to version 0.2 of the PSCI specification
+ * but also supports v0.1. PSCI standardizes operations such as system reset, CPU
+ * on/off/suspend. PSCI requires a compliant firmware implementation.
+ *
+ * The PSCI specification used for this implementation is available at:
+ *
+ * <http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0022b/index.html>.
+ *
+ * TODO:
+ * - Add support for remaining PSCI calls [this implementation only
+ *   supports get_version, system_reset and cpu_on].
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/eventhandler.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/reboot.h>
+
+#include <machine/bus.h>
+
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <dev/psci/psci.h>
+
+struct psci_softc {
+	device_t        dev;
+
+	psci_callfn_t	psci_call;
+	uint32_t	psci_fnids[PSCI_FN_MAX];
+};
+
+static int psci_v0_1_init(device_t dev);
+static int psci_v0_2_init(device_t dev);
+
+struct psci_softc *psci_softc = NULL;
+
+static struct ofw_compat_data compat_data[] = {
+	{"arm,psci-0.2",        (uintptr_t)psci_v0_2_init},
+	{"arm,psci",            (uintptr_t)psci_v0_1_init},
+	{NULL,                  0}
+};
+
+static int psci_probe(device_t dev);
+static int psci_attach(device_t dev);
+static void psci_shutdown(void *, int);
+
+static device_method_t psci_methods[] = {
+	DEVMETHOD(device_probe,     psci_probe),
+	DEVMETHOD(device_attach,    psci_attach),
+
+	DEVMETHOD_END
+};
+
+static driver_t psci_driver = {
+	"psci",
+	psci_methods,
+	sizeof(struct psci_softc),
+};
+
+static devclass_t psci_devclass;
+
+EARLY_DRIVER_MODULE(psci, simplebus, psci_driver, psci_devclass, 0, 0,
+    BUS_PASS_CPU + BUS_PASS_ORDER_FIRST);
+EARLY_DRIVER_MODULE(psci, ofwbus, psci_driver, psci_devclass, 0, 0,
+    BUS_PASS_CPU + BUS_PASS_ORDER_FIRST);
+
+static int
+psci_probe(device_t dev)
+{
+	const struct ofw_compat_data *ocd;
+
+	if (!ofw_bus_status_okay(dev))
+		return (ENXIO);
+
+	ocd = ofw_bus_search_compatible(dev, compat_data);
+	if (ocd->ocd_str == NULL)
+		return (ENXIO);
+
+	device_set_desc(dev, "ARM Power State Co-ordination Interface Driver");
+
+	return (BUS_PROBE_SPECIFIC);
+}
+
+static int
+psci_attach(device_t dev)
+{
+	struct psci_softc *sc = device_get_softc(dev);
+	const struct ofw_compat_data *ocd;
+	psci_initfn_t psci_init;
+	phandle_t node;
+	char method[16];
+
+	if (psci_softc != NULL)
+		return (ENXIO);
+
+	ocd = ofw_bus_search_compatible(dev, compat_data);
+	psci_init = (psci_initfn_t)ocd->ocd_data;
+	KASSERT(psci_init != NULL, ("PSCI init function cannot be NULL"));
+
+	node = ofw_bus_get_node(dev);
+	if ((OF_getprop(node, "method", method, sizeof(method))) > 0) {
+		if (strcmp(method, "hvc") == 0)
+			sc->psci_call = psci_hvc_despatch;
+		else if (strcmp(method, "smc") == 0)
+			sc->psci_call = psci_smc_despatch;
+		else {
+			device_printf(dev,
+			   "psci_attach: PSCI conduit \"%s\" invalid\n",
+			    method);
+			return (ENXIO);
+		}
+	} else {
+		device_printf(dev,
+		    "psci_attach: PSCI conduit not supplied in the DT\n");
+		return (ENXIO);
+	}
+
+	if (psci_init(dev))
+		return (ENXIO);
+
+	psci_softc = sc;
+
+	return (0);
+}
+
+static int
+psci_get_version(struct psci_softc *sc)
+{
+	uint32_t fnid;
+
+	/* PSCI version wasn't supported in v0.1. */
+	fnid = sc->psci_fnids[PSCI_FN_VERSION];
+	if (fnid)
+		return (sc->psci_call(fnid, 0, 0, 0));
+
+	return (PSCI_RETVAL_NOT_SUPPORTED);
+}
+
+int
+psci_cpu_on(unsigned long cpu, unsigned long entry, unsigned long context_id)
+{
+
+	/* PSCI v0.1 and v0.2 both support cpu_on. */
+	return(psci_softc->psci_call(psci_softc->psci_fnids[PSCI_FN_CPU_ON], cpu,
+	    entry, context_id));
+}
+
+static void
+psci_shutdown(void *xsc, int howto)
+{
+	uint32_t fn = 0;
+
+	/* PSCI system_off and system_reset werent't supported in v0.1. */
+	if ((howto & RB_POWEROFF) != 0)
+		fn = psci_softc->psci_fnids[PSCI_FN_SYSTEM_OFF];
+	else if ((howto & RB_HALT) == 0)
+		fn = psci_softc->psci_fnids[PSCI_FN_SYSTEM_RESET];
+
+	if (fn)
+		psci_softc->psci_call(fn, 0, 0, 0);
+
+	/* System reset and off do not return. */
+}
+
+static int
+psci_v0_1_init(device_t dev)
+{
+	struct psci_softc *sc = device_get_softc(dev);
+	int psci_fn;
+	uint32_t psci_fnid;
+	phandle_t node;
+	int len;
+
+
+	/* Zero out the function ID table - Is this needed ? */
+	for (psci_fn = PSCI_FN_VERSION, psci_fnid = PSCI_FNID_VERSION;
+	    psci_fn < PSCI_FN_MAX; psci_fn++, psci_fnid++)
+		sc->psci_fnids[psci_fn] = 0;
+
+	/* PSCI v0.1 doesn't specify function IDs. Get them from DT */
+	node = ofw_bus_get_node(dev);
+
+	if ((len = OF_getproplen(node, "cpu_suspend")) > 0) {
+		OF_getencprop(node, "cpu_suspend", &psci_fnid, len);
+		sc->psci_fnids[PSCI_FN_CPU_SUSPEND] = psci_fnid;
+	}
+
+	if ((len = OF_getproplen(node, "cpu_on")) > 0) {
+		OF_getencprop(node, "cpu_on", &psci_fnid, len);
+		sc->psci_fnids[PSCI_FN_CPU_ON] = psci_fnid;
+	}
+
+	if ((len = OF_getproplen(node, "cpu_off")) > 0) {
+		OF_getencprop(node, "cpu_off", &psci_fnid, len);
+		sc->psci_fnids[PSCI_FN_CPU_OFF] = psci_fnid;
+	}
+
+	if ((len = OF_getproplen(node, "migrate")) > 0) {
+		OF_getencprop(node, "migrate", &psci_fnid, len);
+		sc->psci_fnids[PSCI_FN_MIGRATE] = psci_fnid;
+	}
+
+	if (bootverbose)
+		device_printf(dev, "PSCI version 0.1 available\n");
+
+	return(0);
+}
+
+static int
+psci_v0_2_init(device_t dev)
+{
+	struct psci_softc *sc = device_get_softc(dev);
+	int version;
+
+	/* PSCI v0.2 specifies explicit function IDs. */
+	sc->psci_fnids[PSCI_FN_VERSION]		    = PSCI_FNID_VERSION;
+	sc->psci_fnids[PSCI_FN_CPU_SUSPEND]	    = PSCI_FNID_CPU_SUSPEND;
+	sc->psci_fnids[PSCI_FN_CPU_OFF]		    = PSCI_FNID_CPU_OFF;
+	sc->psci_fnids[PSCI_FN_CPU_ON]		    = PSCI_FNID_CPU_ON;
+	sc->psci_fnids[PSCI_FN_AFFINITY_INFO]	    = PSCI_FNID_AFFINITY_INFO;
+	sc->psci_fnids[PSCI_FN_MIGRATE]		    = PSCI_FNID_MIGRATE;
+	sc->psci_fnids[PSCI_FN_MIGRATE_INFO_TYPE]   = PSCI_FNID_MIGRATE_INFO_TYPE;
+	sc->psci_fnids[PSCI_FN_MIGRATE_INFO_UP_CPU] = PSCI_FNID_MIGRATE_INFO_UP_CPU;
+	sc->psci_fnids[PSCI_FN_SYSTEM_OFF]	    = PSCI_FNID_SYSTEM_OFF;
+	sc->psci_fnids[PSCI_FN_SYSTEM_RESET]	    = PSCI_FNID_SYSTEM_RESET;
+
+	version = psci_get_version(sc);
+
+	if (version == PSCI_RETVAL_NOT_SUPPORTED)
+		return (1);
+
+	if ((PSCI_VER_MAJOR(version) != 0) && (PSCI_VER_MINOR(version) != 2)) {
+		device_printf(dev, "PSCI version number mismatched with DT\n");
+		return (1);
+	}
+
+	if (bootverbose)
+		device_printf(dev, "PSCI version 0.2 available\n");
+
+	/*
+	 * We only register this for v0.2 since v0.1 doesn't support
+	 * system_reset.
+	 */
+	EVENTHANDLER_REGISTER(shutdown_final, psci_shutdown, sc,
+	    SHUTDOWN_PRI_LAST);
+
+	return (0);
+}

Added: head/sys/dev/psci/psci.h
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ head/sys/dev/psci/psci.h	Sun Apr 12 13:00:58 2015	(r281466)
@@ -0,0 +1,102 @@
+/*-
+ * Copyright (c) 2013, 2014 Robin Randhawa
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	_MACHINE_PSCI_H_
+#define	_MACHINE_PSCI_H_
+
+#include <sys/types.h>
+
+typedef int (*psci_initfn_t)(device_t dev);
+typedef int (*psci_callfn_t)(register_t, register_t, register_t, register_t);
+
+extern int psci_present;
+
+void	psci_system_reset(void);
+int	psci_cpu_on(unsigned long, unsigned long, unsigned long);
+int	psci_hvc_despatch(register_t, register_t, register_t, register_t);
+int	psci_smc_despatch(register_t, register_t, register_t, register_t);
+
+
+/*
+ * PSCI return codes.
+ */
+#define	PSCI_RETVAL_SUCCESS		0
+#define	PSCI_RETVAL_NOT_SUPPORTED	-1
+#define	PSCI_RETVAL_INVALID_PARAMS	-2
+#define	PSCI_RETVAL_DENIED		-3
+#define	PSCI_RETVAL_ALREADY_ON		-4
+#define	PSCI_RETVAL_ON_PENDING		-5
+#define	PSCI_RETVAL_INTERNAL_FAILURE	-6
+#define	PSCI_RETVAL_NOT_PRESENT		-7
+#define	PSCI_RETVAL_DISABLED		-8
+
+/*
+ * PSCI function codes (as per PSCI v0.2).
+ */
+#ifdef __aarch64__
+#define	PSCI_FNID_VERSION		0x84000000
+#define	PSCI_FNID_CPU_SUSPEND		0xc4000001
+#define	PSCI_FNID_CPU_OFF		0x84000002
+#define	PSCI_FNID_CPU_ON		0xc4000003
+#define	PSCI_FNID_AFFINITY_INFO		0xc4000004
+#define	PSCI_FNID_MIGRATE		0xc4000005
+#define	PSCI_FNID_MIGRATE_INFO_TYPE	0x84000006
+#define	PSCI_FNID_MIGRATE_INFO_UP_CPU	0xc4000007
+#define	PSCI_FNID_SYSTEM_OFF		0x84000008
+#define	PSCI_FNID_SYSTEM_RESET		0x84000009
+#else
+#define	PSCI_FNID_VERSION		0x84000000
+#define	PSCI_FNID_CPU_SUSPEND		0x84000001
+#define	PSCI_FNID_CPU_OFF		0x84000002
+#define	PSCI_FNID_CPU_ON		0x84000003
+#define	PSCI_FNID_AFFINITY_INFO		0x84000004
+#define	PSCI_FNID_MIGRATE		0x84000005
+#define	PSCI_FNID_MIGRATE_INFO_TYPE	0x84000006
+#define	PSCI_FNID_MIGRATE_INFO_UP_CPU	0x84000007
+#define	PSCI_FNID_SYSTEM_OFF		0x84000008
+#define	PSCI_FNID_SYSTEM_RESET		0x84000009
+#endif
+
+#define	PSCI_VER_MAJOR(v)		(((v) >> 16) & 0xFF)
+#define	PSCI_VER_MINOR(v)		((v) & 0xFF)
+
+enum psci_fn {
+	PSCI_FN_VERSION,
+	PSCI_FN_CPU_SUSPEND,
+	PSCI_FN_CPU_OFF,
+	PSCI_FN_CPU_ON,
+	PSCI_FN_AFFINITY_INFO,
+	PSCI_FN_MIGRATE,
+	PSCI_FN_MIGRATE_INFO_TYPE,
+	PSCI_FN_MIGRATE_INFO_UP_CPU,
+	PSCI_FN_SYSTEM_OFF,
+	PSCI_FN_SYSTEM_RESET,
+	PSCI_FN_MAX
+};
+
+#endif /* _MACHINE_PSCI_H_ */

Added: head/sys/dev/psci/psci_arm.S
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ head/sys/dev/psci/psci_arm.S	Sun Apr 12 13:00:58 2015	(r281466)
@@ -0,0 +1,47 @@
+/*-
+ * Copyright (c) 2015 Andrew Turner
+ * 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 <machine/asm.h>
+__FBSDID("$FreeBSD$");
+
+.arch_extension virt /* For hvc */
+
+/*
+ * int psci_hvc_despatch(register_t psci_fnid, register_t...)
+ */
+ENTRY(psci_hvc_despatch)
+	hvc	#0
+	RET
+END(psci_hvc_despatch)
+
+/*
+ * int psci_smc_despatch(register_t psci_fnid, register_t...)
+ */
+ENTRY(psci_smc_despatch)
+	smc	#0
+	RET
+END(psci_hvc_despatch)



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