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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright © 2023 Dmitry Salychev
*
* 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.
*/
/*
* Small Form Factor (SFF) Committee Pluggable (SFP) Transceiver (FDT-based).
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/module.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/fdt/simplebus.h>
#include "sff_if.h"
struct sfp_fdt_softc {
phandle_t ofw_node;
phandle_t i2c_bus;
phandle_t mod_def;
phandle_t los;
phandle_t tx_fault;
phandle_t tx_disable;
phandle_t rx_rate;
phandle_t tx_rate;
uint32_t max_power; /* in mW */
};
static int
sfp_fdt_probe(device_t dev)
{
phandle_t node;
ssize_t s;
node = ofw_bus_get_node(dev);
if (!ofw_bus_node_is_compatible(node, "sff,sfp"))
return (ENXIO);
s = device_get_property(dev, "i2c-bus", &node, sizeof(node),
DEVICE_PROP_HANDLE);
if (s == -1) {
device_printf(dev, "%s: '%s' has no 'i2c-bus' property, s %zd\n",
__func__, ofw_bus_get_name(dev), s);
return (ENXIO);
}
device_set_desc(dev, "Small Form-factor Pluggable Transceiver");
return (BUS_PROBE_DEFAULT);
}
static int
sfp_fdt_attach(device_t dev)
{
struct sfp_fdt_softc *sc;
ssize_t s;
int error;
sc = device_get_softc(dev);
sc->ofw_node = ofw_bus_get_node(dev);
s = device_get_property(dev, "i2c-bus", &sc->i2c_bus,
sizeof(sc->i2c_bus), DEVICE_PROP_HANDLE);
if (s == -1) {
device_printf(dev, "%s: cannot find 'i2c-bus' property: %zd\n",
__func__, s);
return (ENXIO);
}
/* Optional properties */
(void)device_get_property(dev, "mod-def0-gpios", &sc->mod_def,
sizeof(sc->mod_def), DEVICE_PROP_HANDLE);
(void)device_get_property(dev, "los-gpios", &sc->los, sizeof(sc->los),
DEVICE_PROP_HANDLE);
(void)device_get_property(dev, "tx-fault-gpios", &sc->tx_fault,
sizeof(sc->tx_fault), DEVICE_PROP_HANDLE);
(void)device_get_property(dev, "tx-disable-gpios", &sc->tx_disable,
sizeof(sc->tx_disable), DEVICE_PROP_HANDLE);
(void)device_get_property(dev, "rate-select0-gpios", &sc->rx_rate,
sizeof(sc->rx_rate), DEVICE_PROP_HANDLE);
(void)device_get_property(dev, "rate-select1-gpios", &sc->tx_rate,
sizeof(sc->tx_rate), DEVICE_PROP_HANDLE);
(void)device_get_property(dev, "maximum-power-milliwatt", &sc->max_power,
sizeof(sc->max_power), DEVICE_PROP_UINT32);
error = OF_device_register_xref(OF_xref_from_node(sc->ofw_node), dev);
if (error != 0)
device_printf(dev, "%s: failed to register xref %#x\n",
__func__, OF_xref_from_node(sc->ofw_node));
return (error);
}
static int
sfp_fdt_get_i2c_bus(device_t dev, device_t *i2c_bus)
{
struct sfp_fdt_softc *sc;
device_t xdev;
KASSERT(i2c_bus != NULL, ("%s: i2c_bus is NULL", __func__));
sc = device_get_softc(dev);
xdev = OF_device_from_xref(OF_xref_from_node(sc->i2c_bus));
if (xdev == NULL)
return (ENXIO);
*i2c_bus = xdev;
return (0);
}
static device_method_t sfp_fdt_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, sfp_fdt_probe),
DEVMETHOD(device_attach, sfp_fdt_attach),
/* SFF */
DEVMETHOD(sff_get_i2c_bus, sfp_fdt_get_i2c_bus),
DEVMETHOD_END
};
DEFINE_CLASS_0(sfp_fdt, sfp_fdt_driver, sfp_fdt_methods,
sizeof(struct sfp_fdt_softc));
EARLY_DRIVER_MODULE(sfp_fdt, simplebus, sfp_fdt_driver, 0, 0,
BUS_PASS_SUPPORTDEV);
EARLY_DRIVER_MODULE(sfp_fdt, ofwbus, sfp_fdt_driver, 0, 0,
BUS_PASS_SUPPORTDEV);
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