145 lines
3.6 KiB
C
145 lines
3.6 KiB
C
/*-
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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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*
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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/module.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 "mmio_sram_if.h"
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#include "scmi.h"
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struct shmem_softc {
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device_t dev;
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device_t parent;
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int reg;
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};
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static int
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shmem_probe(device_t dev)
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{
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if (!ofw_bus_is_compatible(dev, "arm,scmi-shmem"))
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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 Shared Memory driver");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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shmem_attach(device_t dev)
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{
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struct shmem_softc *sc;
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phandle_t node;
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int reg;
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sc = device_get_softc(dev);
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sc->dev = dev;
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sc->parent = device_get_parent(dev);
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node = ofw_bus_get_node(dev);
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if (node == -1)
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return (ENXIO);
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OF_getencprop(node, "reg", ®, sizeof(reg));
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dprintf("%s: reg %x\n", __func__, reg);
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sc->reg = reg;
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OF_device_register_xref(OF_xref_from_node(node), dev);
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return (0);
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}
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static int
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shmem_detach(device_t dev)
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{
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return (0);
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}
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void
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scmi_shmem_read(device_t dev, bus_size_t offset, void *buf, bus_size_t len)
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{
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struct shmem_softc *sc;
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uint8_t *addr;
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int i;
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sc = device_get_softc(dev);
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addr = (uint8_t *)buf;
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for (i = 0; i < len; i++)
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addr[i] = MMIO_SRAM_READ_1(sc->parent, sc->reg + offset + i);
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}
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void
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scmi_shmem_write(device_t dev, bus_size_t offset, const void *buf,
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bus_size_t len)
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{
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struct shmem_softc *sc;
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const uint8_t *addr;
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int i;
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sc = device_get_softc(dev);
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addr = (const uint8_t *)buf;
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for (i = 0; i < len; i++)
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MMIO_SRAM_WRITE_1(sc->parent, sc->reg + offset + i, addr[i]);
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}
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static device_method_t shmem_methods[] = {
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DEVMETHOD(device_probe, shmem_probe),
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DEVMETHOD(device_attach, shmem_attach),
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DEVMETHOD(device_detach, shmem_detach),
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DEVMETHOD_END
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};
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DEFINE_CLASS_1(shmem, shmem_driver, shmem_methods, sizeof(struct shmem_softc),
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simplebus_driver);
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EARLY_DRIVER_MODULE(shmem, mmio_sram, shmem_driver, 0, 0,
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BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
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MODULE_VERSION(scmi, 1);
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