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/*-
* Copyright (c) 2009, Nathan Whitehorn <nwhitehorn@FreeBSD.org>
* Copyright (c) 2013 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by Oleksandr Rybalko
* under sponsorship from the FreeBSD Foundation.
*
* 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 unmodified, 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 ``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 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/bus.h>
#include <sys/kernel.h>
#include <sys/libkern.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <dev/fdt/fdt_common.h>
#include <dev/spibus/spi.h>
#include <dev/spibus/spibusvar.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/ofw/openfirm.h>
#include "spibus_if.h"
struct ofw_spibus_devinfo {
struct spibus_ivar opd_dinfo;
struct ofw_bus_devinfo opd_obdinfo;
};
/* Methods */
static device_probe_t ofw_spibus_probe;
static device_attach_t ofw_spibus_attach;
static device_t ofw_spibus_add_child(device_t dev, u_int order,
const char *name, int unit);
static const struct ofw_bus_devinfo *ofw_spibus_get_devinfo(device_t bus,
device_t dev);
static int
ofw_spibus_probe(device_t dev)
{
if (ofw_bus_get_node(dev) == -1)
return (ENXIO);
device_set_desc(dev, "OFW SPI bus");
return (BUS_PROBE_DEFAULT);
}
static int
ofw_spibus_attach(device_t dev)
{
struct spibus_softc *sc = device_get_softc(dev);
struct ofw_spibus_devinfo *dinfo;
phandle_t child;
pcell_t clock, paddr;
device_t childdev;
uint32_t mode = SPIBUS_MODE_NONE;
sc->dev = dev;
bus_generic_probe(dev);
bus_enumerate_hinted_children(dev);
/*
* Attach those children represented in the device tree.
*/
for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
child = OF_peer(child)) {
/*
* Try to get the CS number first from the spi-chipselect
* property, then try the reg property.
*/
if (OF_getencprop(child, "spi-chipselect", &paddr,
sizeof(paddr)) == -1) {
if (OF_getencprop(child, "reg", &paddr,
sizeof(paddr)) == -1)
continue;
}
/*
* Try to get the cpol/cpha mode
*/
if (OF_hasprop(child, "spi-cpol"))
mode = SPIBUS_MODE_CPOL;
if (OF_hasprop(child, "spi-cpha")) {
if (mode == SPIBUS_MODE_CPOL)
mode = SPIBUS_MODE_CPOL_CPHA;
else
mode = SPIBUS_MODE_CPHA;
}
/*
* Try to get the CS polarity
*/
if (OF_hasprop(child, "spi-cs-high"))
paddr |= SPIBUS_CS_HIGH;
/*
* Get the maximum clock frequency for device, zero means
* use the default bus speed.
*
* XXX Note that the current (2018-04-07) dts bindings say that
* spi-max-frequency is a required property (but says nothing of
* how to interpret a value of zero).
*/
if (OF_getencprop(child, "spi-max-frequency", &clock,
sizeof(clock)) == -1)
clock = 0;
/*
* Now set up the SPI and OFW bus layer devinfo and add it
* to the bus.
*/
dinfo = malloc(sizeof(struct ofw_spibus_devinfo), M_DEVBUF,
M_NOWAIT | M_ZERO);
if (dinfo == NULL)
continue;
dinfo->opd_dinfo.cs = paddr;
dinfo->opd_dinfo.clock = clock;
dinfo->opd_dinfo.mode = mode;
if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) !=
0) {
free(dinfo, M_DEVBUF);
continue;
}
childdev = device_add_child(dev, NULL, -1);
device_set_ivars(childdev, dinfo);
}
return (bus_generic_attach(dev));
}
static device_t
ofw_spibus_add_child(device_t dev, u_int order, const char *name, int unit)
{
device_t child;
struct ofw_spibus_devinfo *devi;
child = device_add_child_ordered(dev, order, name, unit);
if (child == NULL)
return (child);
devi = malloc(sizeof(struct ofw_spibus_devinfo), M_DEVBUF,
M_NOWAIT | M_ZERO);
if (devi == NULL) {
device_delete_child(dev, child);
return (0);
}
/*
* NULL all the OFW-related parts of the ivars for non-OFW
* children.
*/
devi->opd_obdinfo.obd_node = -1;
devi->opd_obdinfo.obd_name = NULL;
devi->opd_obdinfo.obd_compat = NULL;
devi->opd_obdinfo.obd_type = NULL;
devi->opd_obdinfo.obd_model = NULL;
device_set_ivars(child, devi);
return (child);
}
static const struct ofw_bus_devinfo *
ofw_spibus_get_devinfo(device_t bus, device_t dev)
{
struct ofw_spibus_devinfo *dinfo;
dinfo = device_get_ivars(dev);
return (&dinfo->opd_obdinfo);
}
static device_method_t ofw_spibus_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, ofw_spibus_probe),
DEVMETHOD(device_attach, ofw_spibus_attach),
/* Bus interface */
DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
DEVMETHOD(bus_add_child, ofw_spibus_add_child),
/* ofw_bus interface */
DEVMETHOD(ofw_bus_get_devinfo, ofw_spibus_get_devinfo),
DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat),
DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model),
DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name),
DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node),
DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type),
DEVMETHOD_END
};
static devclass_t ofwspibus_devclass;
DEFINE_CLASS_1(spibus, ofw_spibus_driver, ofw_spibus_methods,
sizeof(struct spibus_softc), spibus_driver);
DRIVER_MODULE(ofw_spibus, spi, ofw_spibus_driver, ofwspibus_devclass, 0, 0);
MODULE_VERSION(ofw_spibus, 1);
MODULE_DEPEND(ofw_spibus, spibus, 1, 1, 1);
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