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scmi: Add an SCMI SMC transport driver
Using the SCMI transport interface add a new SMC transport to the SCMI stack. Sponsored by: Arm Ltd Differential Revision: https://reviews.freebsd.org/D43040
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@ -274,6 +274,7 @@ dev/firmware/arm/scmi.c optional fdt scmi
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dev/firmware/arm/scmi_clk.c optional fdt scmi
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dev/firmware/arm/scmi_if.m optional fdt scmi
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dev/firmware/arm/scmi_mailbox.c optional fdt scmi
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dev/firmware/arm/scmi_smc.c optional fdt scmi
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dev/firmware/arm/scmi_shmem.c optional fdt scmi
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dev/gpio/pl061.c optional pl061 gpio
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131
sys/dev/firmware/arm/scmi_smc.c
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131
sys/dev/firmware/arm/scmi_smc.c
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@ -0,0 +1,131 @@
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/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2022 Ruslan Bukin <br@bsdpad.com>
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* Copyright (c) 2023 Arm Ltd
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*
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* This work was supported by Innovate UK project 105694, "Digital Security
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* by Design (DSbD) Technology Platform Prototype".
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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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#include <sys/cdefs.h>
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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/cpu.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <dev/fdt/simplebus.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/psci/smccc.h>
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#include "scmi.h"
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#include "scmi_protocols.h"
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struct scmi_smc_softc {
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struct scmi_softc base;
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uint32_t smc_id;
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};
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static int
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scmi_smc_xfer_msg(device_t dev)
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{
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struct scmi_smc_softc *sc;
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sc = device_get_softc(dev);
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SCMI_ASSERT_LOCKED(&sc->base);
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arm_smccc_smc(sc->smc_id, 0, 0, 0, 0, 0, 0, 0, NULL);
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return (0);
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}
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static int
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scmi_smc_probe(device_t dev)
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{
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if (!ofw_bus_is_compatible(dev, "arm,scmi-smc"))
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return (ENXIO);
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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device_set_desc(dev, "ARM SCMI SCM interface driver");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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scmi_smc_attach(device_t dev)
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{
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struct scmi_smc_softc *sc;
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phandle_t node;
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ssize_t len;
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sc = device_get_softc(dev);
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node = ofw_bus_get_node(dev);
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len = OF_getencprop(node, "arm,smc-id", &sc->smc_id,
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sizeof(sc->smc_id));
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if (len <= 0) {
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device_printf(dev, "No SMC ID found\n");
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return (EINVAL);
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}
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device_printf(dev, "smc id %x\n", sc->smc_id);
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return (scmi_attach(dev));
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}
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static int
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scmi_smc_detach(device_t dev)
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{
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return (0);
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}
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static device_method_t scmi_smc_methods[] = {
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DEVMETHOD(device_probe, scmi_smc_probe),
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DEVMETHOD(device_attach, scmi_smc_attach),
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DEVMETHOD(device_detach, scmi_smc_detach),
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/* SCMI interface */
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DEVMETHOD(scmi_xfer_msg, scmi_smc_xfer_msg),
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DEVMETHOD_END
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};
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DEFINE_CLASS_1(scmi_smc, scmi_smc_driver, scmi_smc_methods,
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sizeof(struct scmi_smc_softc), scmi_driver);
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/* Needs to be after the mmio_sram driver */
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EARLY_DRIVER_MODULE(scmi_smc, simplebus, scmi_smc_driver, 0, 0,
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BUS_PASS_SUPPORTDEV + BUS_PASS_ORDER_LATE);
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MODULE_VERSION(scmi_smc, 1);
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