scmi_shmem.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause
    3  *
    4  * Copyright (c) 2022 Ruslan Bukin <br@bsdpad.com>
    5  *
    6  * This work was supported by Innovate UK project 105694, "Digital Security
    7  * by Design (DSbD) Technology Platform Prototype".
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/bus.h>
   37 #include <sys/cpu.h>
   38 #include <sys/kernel.h>
   39 #include <sys/module.h>
   40 
   41 #include <dev/fdt/simplebus.h>
   42 #include <dev/fdt/fdt_common.h>
   43 #include <dev/ofw/ofw_bus_subr.h>
   44 
   45 #include "mmio_sram_if.h"
   46 
   47 #include "scmi.h"
   48 
   49 struct shmem_softc {
   50         device_t                dev;
   51         device_t                parent;
   52         int                     reg;
   53 };
   54 
   55 static int
   56 shmem_probe(device_t dev)
   57 {
   58 
   59         if (!ofw_bus_is_compatible(dev, "arm,scmi-shmem"))
   60                 return (ENXIO);
   61 
   62         if (!ofw_bus_status_okay(dev))
   63                 return (ENXIO);
   64 
   65         device_set_desc(dev, "ARM SCMI Shared Memory driver");
   66 
   67         return (BUS_PROBE_DEFAULT);
   68 }
   69 
   70 static int
   71 shmem_attach(device_t dev)
   72 {
   73         struct shmem_softc *sc;
   74         phandle_t node;
   75         int reg;
   76 
   77         sc = device_get_softc(dev);
   78         sc->dev = dev;
   79         sc->parent = device_get_parent(dev);
   80 
   81         node = ofw_bus_get_node(dev);
   82         if (node == -1)
   83                 return (ENXIO);
   84 
   85         OF_getencprop(node, "reg", &reg, sizeof(reg));
   86 
   87         dprintf("%s: reg %x\n", __func__, reg);
   88 
   89         sc->reg = reg;
   90 
   91         OF_device_register_xref(OF_xref_from_node(node), dev);
   92 
   93         return (0);
   94 }
   95 
   96 static int
   97 shmem_detach(device_t dev)
   98 {
   99 
  100         return (0);
  101 }
  102 
  103 void
  104 scmi_shmem_read(device_t dev, bus_size_t offset, void *buf, bus_size_t len)
  105 {
  106         struct shmem_softc *sc;
  107         uint8_t *addr;
  108         int i;
  109 
  110         sc = device_get_softc(dev);
  111 
  112         addr = (uint8_t *)buf;
  113 
  114         for (i = 0; i < len; i++)
  115                 addr[i] = MMIO_SRAM_READ_1(sc->parent, sc->reg + offset + i);
  116 }
  117 
  118 void
  119 scmi_shmem_write(device_t dev, bus_size_t offset, const void *buf,
  120     bus_size_t len)
  121 {
  122         struct shmem_softc *sc;
  123         const uint8_t *addr;
  124         int i;
  125 
  126         sc = device_get_softc(dev);
  127 
  128         addr = (const uint8_t *)buf;
  129 
  130         for (i = 0; i < len; i++)
  131                 MMIO_SRAM_WRITE_1(sc->parent, sc->reg + offset + i, addr[i]);
  132 }
  133 
  134 static device_method_t shmem_methods[] = {
  135         DEVMETHOD(device_probe,         shmem_probe),
  136         DEVMETHOD(device_attach,        shmem_attach),
  137         DEVMETHOD(device_detach,        shmem_detach),
  138         DEVMETHOD_END
  139 };
  140 
  141 DEFINE_CLASS_1(shmem, shmem_driver, shmem_methods, sizeof(struct shmem_softc),
  142     simplebus_driver);
  143 
  144 EARLY_DRIVER_MODULE(shmem, mmio_sram, shmem_driver, 0, 0,
  145     BUS_PASS_INTERRUPT + BUS_PASS_ORDER_MIDDLE);
  146 MODULE_VERSION(scmi, 1);

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FreeBSD/Linux Kernel Cross Reference sys/dev/firmware/arm/scmi_shmem.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/firmware/arm/scmi_shmem.c