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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2022 Ruslan Bukin <br@bsdpad.com>
* Copyright (c) 2023 Arm Ltd
*
* This work was supported by Innovate UK project 105694, "Digital Security
* by Design (DSbD) Technology Platform Prototype".
*
* 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>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/cpu.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <dev/fdt/simplebus.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/psci/smccc.h>
#include "scmi.h"
#include "scmi_protocols.h"
#include "scmi_shmem.h"
struct scmi_smc_softc {
struct scmi_softc base;
uint32_t smc_id;
device_t a2p_dev;
};
static int scmi_smc_transport_init(device_t);
static int scmi_smc_xfer_msg(device_t, struct scmi_msg *);
static int scmi_smc_poll_msg(device_t, struct scmi_msg *, unsigned int);
static int scmi_smc_collect_reply(device_t, struct scmi_msg *);
static void scmi_smc_tx_complete(device_t, void *);
static int scmi_smc_probe(device_t);
static int
scmi_smc_transport_init(device_t dev)
{
struct scmi_smc_softc *sc;
phandle_t node;
ssize_t len;
sc = device_get_softc(dev);
node = ofw_bus_get_node(dev);
len = OF_getencprop(node, "arm,smc-id", &sc->smc_id,
sizeof(sc->smc_id));
if (len <= 0) {
device_printf(dev, "No SMC ID found\n");
return (EINVAL);
}
device_printf(dev, "smc id %x\n", sc->smc_id);
sc->a2p_dev = scmi_shmem_get(dev, node, SCMI_CHAN_A2P);
if (sc->a2p_dev == NULL) {
device_printf(dev, "A2P shmem dev not found.\n");
return (ENXIO);
}
sc->base.trs_desc.no_completion_irq = true;
sc->base.trs_desc.reply_timo_ms = 30;
return (0);
}
static int
scmi_smc_xfer_msg(device_t dev, struct scmi_msg *msg)
{
struct scmi_smc_softc *sc;
int ret;
sc = device_get_softc(dev);
ret = scmi_shmem_prepare_msg(sc->a2p_dev, (uint8_t *)&msg->hdr,
msg->tx_len, msg->polling);
if (ret != 0)
return (ret);
arm_smccc_invoke_smc(sc->smc_id, NULL);
return (0);
}
static int
scmi_smc_poll_msg(device_t dev, struct scmi_msg *msg, unsigned int tmo)
{
struct scmi_smc_softc *sc;
sc = device_get_softc(dev);
/*
* Nothing to poll since commands are completed as soon as smc
* returns ... but did we get back what we were poling for ?
*/
scmi_shmem_read_msg_header(sc->a2p_dev, &msg->hdr, &msg->rx_len);
return (0);
}
static int
scmi_smc_collect_reply(device_t dev, struct scmi_msg *msg)
{
struct scmi_smc_softc *sc;
int ret;
sc = device_get_softc(dev);
ret = scmi_shmem_read_msg_payload(sc->a2p_dev,
msg->payld, msg->rx_len - SCMI_MSG_HDR_SIZE, msg->rx_len);
return (ret);
}
static void
scmi_smc_tx_complete(device_t dev, void *chan)
{
struct scmi_smc_softc *sc;
sc = device_get_softc(dev);
scmi_shmem_tx_complete(sc->a2p_dev);
}
static int
scmi_smc_probe(device_t dev)
{
if (!ofw_bus_is_compatible(dev, "arm,scmi-smc"))
return (ENXIO);
if (!ofw_bus_status_okay(dev))
return (ENXIO);
device_set_desc(dev, "ARM SCMI SMC Transport driver");
return (BUS_PROBE_DEFAULT);
}
static device_method_t scmi_smc_methods[] = {
DEVMETHOD(device_probe, scmi_smc_probe),
/* SCMI interface */
DEVMETHOD(scmi_transport_init, scmi_smc_transport_init),
DEVMETHOD(scmi_xfer_msg, scmi_smc_xfer_msg),
DEVMETHOD(scmi_poll_msg, scmi_smc_poll_msg),
DEVMETHOD(scmi_collect_reply, scmi_smc_collect_reply),
DEVMETHOD(scmi_tx_complete, scmi_smc_tx_complete),
DEVMETHOD_END
};
DEFINE_CLASS_1(scmi_smc, scmi_smc_driver, scmi_smc_methods,
sizeof(struct scmi_smc_softc), scmi_driver);
/* Needs to be after the mmio_sram driver */
EARLY_DRIVER_MODULE(scmi_smc, simplebus, scmi_smc_driver, 0, 0,
BUS_PASS_SUPPORTDEV + BUS_PASS_ORDER_LATE);
MODULE_VERSION(scmi_smc, 1);
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