6e3244f594
can be seen as the same as 0.2. There are changes with the data passed to CPU_SUSPEND, however we don't yet use this call. Sponsored by: ABT Systems Ltd
309 lines
8.4 KiB
C
309 lines
8.4 KiB
C
/*-
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* Copyright (c) 2014 Robin Randhawa
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/*
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* This implements support for ARM's Power State Co-ordination Interface
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* [PSCI]. The implementation adheres to version 0.2 of the PSCI specification
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* but also supports v0.1. PSCI standardizes operations such as system reset, CPU
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* on/off/suspend. PSCI requires a compliant firmware implementation.
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*
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* The PSCI specification used for this implementation is available at:
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*
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* <http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0022b/index.html>.
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*
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* TODO:
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* - Add support for remaining PSCI calls [this implementation only
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* supports get_version, system_reset and cpu_on].
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/eventhandler.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/reboot.h>
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#include <machine/bus.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/psci/psci.h>
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struct psci_softc {
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device_t dev;
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psci_callfn_t psci_call;
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uint32_t psci_fnids[PSCI_FN_MAX];
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};
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static int psci_v0_1_init(device_t dev);
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static int psci_v0_2_init(device_t dev);
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struct psci_softc *psci_softc = NULL;
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static struct ofw_compat_data compat_data[] = {
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{"arm,psci-0.2", (uintptr_t)psci_v0_2_init},
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{"arm,psci", (uintptr_t)psci_v0_1_init},
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{NULL, 0}
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};
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static int psci_probe(device_t dev);
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static int psci_attach(device_t dev);
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static void psci_shutdown(void *, int);
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static device_method_t psci_methods[] = {
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DEVMETHOD(device_probe, psci_probe),
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DEVMETHOD(device_attach, psci_attach),
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DEVMETHOD_END
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};
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static driver_t psci_driver = {
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"psci",
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psci_methods,
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sizeof(struct psci_softc),
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};
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static devclass_t psci_devclass;
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EARLY_DRIVER_MODULE(psci, simplebus, psci_driver, psci_devclass, 0, 0,
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BUS_PASS_CPU + BUS_PASS_ORDER_FIRST);
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EARLY_DRIVER_MODULE(psci, ofwbus, psci_driver, psci_devclass, 0, 0,
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BUS_PASS_CPU + BUS_PASS_ORDER_FIRST);
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static psci_callfn_t
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psci_get_callfn(phandle_t node)
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{
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char method[16];
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if ((OF_getprop(node, "method", method, sizeof(method))) > 0) {
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if (strcmp(method, "hvc") == 0)
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return (psci_hvc_despatch);
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else if (strcmp(method, "smc") == 0)
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return (psci_smc_despatch);
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else
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printf("psci: PSCI conduit \"%s\" invalid\n", method);
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} else
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printf("psci: PSCI conduit not supplied in the device tree\n");
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return (NULL);
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}
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static int
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psci_probe(device_t dev)
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{
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const struct ofw_compat_data *ocd;
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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ocd = ofw_bus_search_compatible(dev, compat_data);
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if (ocd->ocd_str == NULL)
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return (ENXIO);
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device_set_desc(dev, "ARM Power State Co-ordination Interface Driver");
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return (BUS_PROBE_SPECIFIC);
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}
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static int
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psci_attach(device_t dev)
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{
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struct psci_softc *sc = device_get_softc(dev);
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const struct ofw_compat_data *ocd;
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psci_initfn_t psci_init;
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phandle_t node;
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if (psci_softc != NULL)
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return (ENXIO);
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ocd = ofw_bus_search_compatible(dev, compat_data);
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psci_init = (psci_initfn_t)ocd->ocd_data;
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KASSERT(psci_init != NULL, ("PSCI init function cannot be NULL"));
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node = ofw_bus_get_node(dev);
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sc->psci_call = psci_get_callfn(node);
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if (sc->psci_call == NULL)
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return (ENXIO);
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if (psci_init(dev))
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return (ENXIO);
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psci_softc = sc;
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return (0);
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}
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static int
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psci_get_version(struct psci_softc *sc)
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{
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uint32_t fnid;
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/* PSCI version wasn't supported in v0.1. */
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fnid = sc->psci_fnids[PSCI_FN_VERSION];
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if (fnid)
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return (sc->psci_call(fnid, 0, 0, 0));
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return (PSCI_RETVAL_NOT_SUPPORTED);
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}
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int
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psci_cpu_on(unsigned long cpu, unsigned long entry, unsigned long context_id)
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{
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psci_callfn_t callfn;
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phandle_t node;
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uint32_t fnid;
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if (psci_softc == NULL) {
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node = ofw_bus_find_compatible(OF_peer(0), "arm,psci-0.2");
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if (node == 0)
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/* TODO: Handle psci 0.1 */
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return (PSCI_RETVAL_INTERNAL_FAILURE);
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fnid = PSCI_FNID_CPU_ON;
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callfn = psci_get_callfn(node);
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if (callfn == NULL)
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return (PSCI_RETVAL_INTERNAL_FAILURE);
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} else {
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callfn = psci_softc->psci_call;
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fnid = psci_softc->psci_fnids[PSCI_FN_CPU_ON];
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}
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/* PSCI v0.1 and v0.2 both support cpu_on. */
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return (callfn(fnid, cpu, entry, context_id));
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}
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static void
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psci_shutdown(void *xsc, int howto)
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{
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uint32_t fn = 0;
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/* PSCI system_off and system_reset werent't supported in v0.1. */
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if ((howto & RB_POWEROFF) != 0)
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fn = psci_softc->psci_fnids[PSCI_FN_SYSTEM_OFF];
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else if ((howto & RB_HALT) == 0)
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fn = psci_softc->psci_fnids[PSCI_FN_SYSTEM_RESET];
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if (fn)
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psci_softc->psci_call(fn, 0, 0, 0);
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/* System reset and off do not return. */
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}
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static int
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psci_v0_1_init(device_t dev)
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{
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struct psci_softc *sc = device_get_softc(dev);
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int psci_fn;
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uint32_t psci_fnid;
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phandle_t node;
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int len;
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/* Zero out the function ID table - Is this needed ? */
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for (psci_fn = PSCI_FN_VERSION, psci_fnid = PSCI_FNID_VERSION;
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psci_fn < PSCI_FN_MAX; psci_fn++, psci_fnid++)
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sc->psci_fnids[psci_fn] = 0;
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/* PSCI v0.1 doesn't specify function IDs. Get them from DT */
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node = ofw_bus_get_node(dev);
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if ((len = OF_getproplen(node, "cpu_suspend")) > 0) {
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OF_getencprop(node, "cpu_suspend", &psci_fnid, len);
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sc->psci_fnids[PSCI_FN_CPU_SUSPEND] = psci_fnid;
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}
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if ((len = OF_getproplen(node, "cpu_on")) > 0) {
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OF_getencprop(node, "cpu_on", &psci_fnid, len);
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sc->psci_fnids[PSCI_FN_CPU_ON] = psci_fnid;
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}
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if ((len = OF_getproplen(node, "cpu_off")) > 0) {
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OF_getencprop(node, "cpu_off", &psci_fnid, len);
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sc->psci_fnids[PSCI_FN_CPU_OFF] = psci_fnid;
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}
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if ((len = OF_getproplen(node, "migrate")) > 0) {
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OF_getencprop(node, "migrate", &psci_fnid, len);
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sc->psci_fnids[PSCI_FN_MIGRATE] = psci_fnid;
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}
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if (bootverbose)
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device_printf(dev, "PSCI version 0.1 available\n");
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return(0);
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}
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static int
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psci_v0_2_init(device_t dev)
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{
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struct psci_softc *sc = device_get_softc(dev);
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int version;
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/* PSCI v0.2 specifies explicit function IDs. */
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sc->psci_fnids[PSCI_FN_VERSION] = PSCI_FNID_VERSION;
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sc->psci_fnids[PSCI_FN_CPU_SUSPEND] = PSCI_FNID_CPU_SUSPEND;
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sc->psci_fnids[PSCI_FN_CPU_OFF] = PSCI_FNID_CPU_OFF;
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sc->psci_fnids[PSCI_FN_CPU_ON] = PSCI_FNID_CPU_ON;
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sc->psci_fnids[PSCI_FN_AFFINITY_INFO] = PSCI_FNID_AFFINITY_INFO;
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sc->psci_fnids[PSCI_FN_MIGRATE] = PSCI_FNID_MIGRATE;
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sc->psci_fnids[PSCI_FN_MIGRATE_INFO_TYPE] = PSCI_FNID_MIGRATE_INFO_TYPE;
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sc->psci_fnids[PSCI_FN_MIGRATE_INFO_UP_CPU] = PSCI_FNID_MIGRATE_INFO_UP_CPU;
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sc->psci_fnids[PSCI_FN_SYSTEM_OFF] = PSCI_FNID_SYSTEM_OFF;
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sc->psci_fnids[PSCI_FN_SYSTEM_RESET] = PSCI_FNID_SYSTEM_RESET;
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version = psci_get_version(sc);
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if (version == PSCI_RETVAL_NOT_SUPPORTED)
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return (1);
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if ((PSCI_VER_MAJOR(version) == 0 && PSCI_VER_MINOR(version) == 2) ||
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(PSCI_VER_MAJOR(version) == 1 && PSCI_VER_MINOR(version) == 0)) {
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if (bootverbose)
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device_printf(dev, "PSCI version 0.2 available\n");
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/*
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* We only register this for v0.2 since v0.1 doesn't support
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* system_reset.
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*/
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EVENTHANDLER_REGISTER(shutdown_final, psci_shutdown, sc,
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SHUTDOWN_PRI_LAST);
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return (0);
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}
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device_printf(dev, "PSCI version number mismatched with DT\n");
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return (1);
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}
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