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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020 Andrew Turner
*
* 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>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <dev/fdt/simplebus.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <arm/broadcom/bcm2835/bcm2835_firmware.h>
#include <arm/broadcom/bcm2835/bcm2835_mbox.h>
#include <arm/broadcom/bcm2835/bcm2835_mbox_prop.h>
#include <arm/broadcom/bcm2835/bcm2835_vcbus.h>
struct bcm2835_firmware_softc {
struct simplebus_softc sc;
phandle_t sc_mbox;
};
static struct ofw_compat_data compat_data[] = {
{"raspberrypi,bcm2835-firmware", 1},
{NULL, 0}
};
static int sysctl_bcm2835_firmware_get_revision(SYSCTL_HANDLER_ARGS);
static int
bcm2835_firmware_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
return (ENXIO);
device_set_desc(dev, "BCM2835 Firmware");
return (BUS_PROBE_DEFAULT);
}
static int
bcm2835_firmware_attach(device_t dev)
{
struct bcm2835_firmware_softc *sc;
struct sysctl_ctx_list *ctx;
struct sysctl_oid *tree_node;
struct sysctl_oid_list *tree;
phandle_t node, mbox;
int rv;
sc = device_get_softc(dev);
node = ofw_bus_get_node(dev);
rv = OF_getencprop(node, "mboxes", &mbox, sizeof(mbox));
if (rv <= 0) {
device_printf(dev, "can't read mboxes property\n");
return (ENXIO);
}
sc->sc_mbox = mbox;
OF_device_register_xref(OF_xref_from_node(node), dev);
ctx = device_get_sysctl_ctx(dev);
tree_node = device_get_sysctl_tree(dev);
tree = SYSCTL_CHILDREN(tree_node);
SYSCTL_ADD_PROC(ctx, tree, OID_AUTO, "revision",
CTLTYPE_UINT | CTLFLAG_RD, sc, sizeof(*sc),
sysctl_bcm2835_firmware_get_revision, "IU",
"Firmware revision");
/* The firmwaare doesn't have a ranges property */
sc->sc.flags |= SB_FLAG_NO_RANGES;
return (simplebus_attach(dev));
}
int
bcm2835_firmware_property(device_t dev, uint32_t prop, void *data, size_t len)
{
struct {
struct bcm2835_mbox_hdr hdr;
struct bcm2835_mbox_tag_hdr tag_hdr;
uint32_t data[];
} *msg_hdr;
size_t msg_len;
int err;
/*
* The message is processed in 32-bit chunks so must be a multiple
* of 32-bits.
*/
if ((len & (sizeof(uint32_t) - 1)) != 0)
return (EINVAL);
msg_len = sizeof(*msg_hdr) + len + sizeof(uint32_t);
msg_hdr = malloc(sizeof(*msg_hdr) + msg_len + sizeof(uint32_t),
M_DEVBUF, M_WAITOK | M_ZERO);
msg_hdr->hdr.buf_size = msg_len;
msg_hdr->hdr.code = BCM2835_MBOX_CODE_REQ;
msg_hdr->tag_hdr.tag = prop;
msg_hdr->tag_hdr.val_buf_size = len;
memcpy(msg_hdr->data, data, len);
msg_hdr->data[len / sizeof(uint32_t)] = 0;
err = bcm2835_mbox_property(msg_hdr, msg_len);
if (err == 0) {
memcpy(data, msg_hdr->data, len);
}
free(msg_hdr, M_DEVBUF);
return (err);
}
static int
sysctl_bcm2835_firmware_get_revision(SYSCTL_HANDLER_ARGS)
{
struct bcm2835_firmware_softc *sc = arg1;
uint32_t rev;
int err;
if (bcm2835_firmware_property(sc->sc.dev,
BCM2835_MBOX_TAG_FIRMWARE_REVISION, &rev, sizeof(rev)) != 0)
return (ENXIO);
err = sysctl_handle_int(oidp, &rev, sizeof(rev), req);
if (err || !req->newptr) /* error || read request */
return (err);
/* write request */
return (EINVAL);
}
static device_method_t bcm2835_firmware_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, bcm2835_firmware_probe),
DEVMETHOD(device_attach, bcm2835_firmware_attach),
DEVMETHOD_END
};
static devclass_t bcm2835_firmware_devclass;
DEFINE_CLASS_1(bcm2835_firmware, bcm2835_firmware_driver,
bcm2835_firmware_methods, sizeof(struct bcm2835_firmware_softc),
simplebus_driver);
EARLY_DRIVER_MODULE(bcm2835_firmware, simplebus, bcm2835_firmware_driver,
bcm2835_firmware_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_LATE);
MODULE_DEPEND(bcm2835_firmware, mbox, 1, 1, 1);
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