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/* $OpenBSD: psci.c,v 1.2 2017/02/27 08:39:25 patrick Exp $ */
/*
* Copyright (c) 2016 Jonathan Gray <jsg@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/device.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/fdt.h>
extern void (*cpuresetfn)(void);
extern void (*powerdownfn)(void);
#define SYSTEM_OFF 0x84000008
#define SYSTEM_RESET 0x84000009
struct psci_softc {
struct device sc_dev;
void (*callfn)(uint32_t, uint32_t, uint32_t, uint32_t);
int sc_system_off;
int sc_system_reset;
};
struct psci_softc *psci_sc;
int psci_match(struct device *, void *, void *);
void psci_attach(struct device *, struct device *, void *);
void psci_reset(void);
void psci_powerdown(void);
extern void hvc_call(uint32_t, uint32_t, uint32_t, uint32_t);
extern void smc_call(uint32_t, uint32_t, uint32_t, uint32_t);
struct cfattach psci_ca = {
sizeof(struct psci_softc), psci_match, psci_attach
};
struct cfdriver psci_cd = {
NULL, "psci", DV_DULL
};
int
psci_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "arm,psci") ||
OF_is_compatible(faa->fa_node, "arm,psci-0.2") ||
OF_is_compatible(faa->fa_node, "arm,psci-1.0");
}
void
psci_attach(struct device *parent, struct device *self, void *aux)
{
struct psci_softc *sc = (struct psci_softc *) self;
struct fdt_attach_args *faa = aux;
char method[128];
if (OF_getprop(faa->fa_node, "method", method, sizeof(method))) {
if (strcmp(method, "hvc") == 0)
sc->callfn = hvc_call;
else if (strcmp(method, "smc") == 0)
sc->callfn = smc_call;
}
/*
* The function IDs are only to be parsed for the old specification
* (as in version 0.1). All newer implementations are supposed to
* use the specified values.
*/
if (OF_is_compatible(faa->fa_node, "arm,psci-0.2") ||
OF_is_compatible(faa->fa_node, "arm,psci-1.0")) {
sc->sc_system_off = SYSTEM_OFF;
sc->sc_system_reset = SYSTEM_RESET;
} else if (OF_is_compatible(faa->fa_node, "arm,psci")) {
sc->sc_system_off = OF_getpropint(faa->fa_node,
"system_off", 0);
sc->sc_system_reset = OF_getpropint(faa->fa_node,
"system_reset", 0);
}
printf("\n");
psci_sc = sc;
if (sc->sc_system_off != 0)
powerdownfn = psci_powerdown;
if (sc->sc_system_reset != 0)
cpuresetfn = psci_reset;
}
void
psci_reset(void)
{
struct psci_softc *sc = psci_sc;
if (sc->callfn)
(*sc->callfn)(sc->sc_system_reset, 0, 0, 0);
}
void
psci_powerdown(void)
{
struct psci_softc *sc = psci_sc;
if (sc->callfn)
(*sc->callfn)(sc->sc_system_off, 0, 0, 0);
}
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