ade70a1ad1
implementation that must be used, it's just the base system default driver. Also add a comment noting that we're being more liberal about the bus frequency property than the dts binding documents require.
228 lines
6.3 KiB
C
228 lines
6.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2009, Nathan Whitehorn <nwhitehorn@FreeBSD.org>
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* Copyright (c) 2013 The FreeBSD Foundation
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* All rights reserved.
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*
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* Portions of this software were developed by Oleksandr Rybalko
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* under sponsorship from the FreeBSD Foundation.
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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 unmodified, this list of conditions, and the following
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* 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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/libkern.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/spibus/spi.h>
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#include <dev/spibus/spibusvar.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/ofw/openfirm.h>
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#include "spibus_if.h"
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struct ofw_spibus_devinfo {
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struct spibus_ivar opd_dinfo;
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struct ofw_bus_devinfo opd_obdinfo;
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};
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/* Methods */
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static device_probe_t ofw_spibus_probe;
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static device_attach_t ofw_spibus_attach;
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static device_t ofw_spibus_add_child(device_t dev, u_int order,
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const char *name, int unit);
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static const struct ofw_bus_devinfo *ofw_spibus_get_devinfo(device_t bus,
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device_t dev);
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static int
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ofw_spibus_probe(device_t dev)
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{
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if (ofw_bus_get_node(dev) == -1)
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return (ENXIO);
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device_set_desc(dev, "OFW SPI bus");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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ofw_spibus_attach(device_t dev)
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{
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struct spibus_softc *sc = device_get_softc(dev);
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struct ofw_spibus_devinfo *dinfo;
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phandle_t child;
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pcell_t clock, paddr;
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device_t childdev;
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uint32_t mode = SPIBUS_MODE_NONE;
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sc->dev = dev;
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bus_generic_probe(dev);
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bus_enumerate_hinted_children(dev);
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/*
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* Attach those children represented in the device tree.
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*/
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for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
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child = OF_peer(child)) {
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/*
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* Try to get the CS number first from the spi-chipselect
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* property, then try the reg property.
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*/
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if (OF_getencprop(child, "spi-chipselect", &paddr,
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sizeof(paddr)) == -1) {
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if (OF_getencprop(child, "reg", &paddr,
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sizeof(paddr)) == -1)
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continue;
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}
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/*
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* Try to get the cpol/cpha mode
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*/
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if (OF_hasprop(child, "spi-cpol"))
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mode = SPIBUS_MODE_CPOL;
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if (OF_hasprop(child, "spi-cpha")) {
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if (mode == SPIBUS_MODE_CPOL)
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mode = SPIBUS_MODE_CPOL_CPHA;
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else
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mode = SPIBUS_MODE_CPHA;
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}
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/*
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* Try to get the CS polarity
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*/
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if (OF_hasprop(child, "spi-cs-high"))
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paddr |= SPIBUS_CS_HIGH;
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/*
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* Get the maximum clock frequency for device, zero means
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* use the default bus speed.
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*
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* XXX Note that the current (2018-04-07) dts bindings say that
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* spi-max-frequency is a required property (but says nothing of
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* how to interpret a value of zero).
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*/
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if (OF_getencprop(child, "spi-max-frequency", &clock,
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sizeof(clock)) == -1)
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clock = 0;
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/*
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* Now set up the SPI and OFW bus layer devinfo and add it
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* to the bus.
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*/
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dinfo = malloc(sizeof(struct ofw_spibus_devinfo), M_DEVBUF,
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M_NOWAIT | M_ZERO);
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if (dinfo == NULL)
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continue;
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dinfo->opd_dinfo.cs = paddr;
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dinfo->opd_dinfo.clock = clock;
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dinfo->opd_dinfo.mode = mode;
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if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) !=
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0) {
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free(dinfo, M_DEVBUF);
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continue;
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}
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childdev = device_add_child(dev, NULL, -1);
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device_set_ivars(childdev, dinfo);
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}
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return (bus_generic_attach(dev));
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}
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static device_t
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ofw_spibus_add_child(device_t dev, u_int order, const char *name, int unit)
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{
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device_t child;
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struct ofw_spibus_devinfo *devi;
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child = device_add_child_ordered(dev, order, name, unit);
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if (child == NULL)
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return (child);
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devi = malloc(sizeof(struct ofw_spibus_devinfo), M_DEVBUF,
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M_NOWAIT | M_ZERO);
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if (devi == NULL) {
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device_delete_child(dev, child);
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return (0);
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}
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/*
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* NULL all the OFW-related parts of the ivars for non-OFW
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* children.
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*/
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devi->opd_obdinfo.obd_node = -1;
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devi->opd_obdinfo.obd_name = NULL;
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devi->opd_obdinfo.obd_compat = NULL;
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devi->opd_obdinfo.obd_type = NULL;
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devi->opd_obdinfo.obd_model = NULL;
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device_set_ivars(child, devi);
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return (child);
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}
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static const struct ofw_bus_devinfo *
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ofw_spibus_get_devinfo(device_t bus, device_t dev)
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{
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struct ofw_spibus_devinfo *dinfo;
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dinfo = device_get_ivars(dev);
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return (&dinfo->opd_obdinfo);
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}
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static device_method_t ofw_spibus_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, ofw_spibus_probe),
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DEVMETHOD(device_attach, ofw_spibus_attach),
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/* Bus interface */
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DEVMETHOD(bus_child_pnpinfo_str, ofw_bus_gen_child_pnpinfo_str),
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DEVMETHOD(bus_add_child, ofw_spibus_add_child),
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/* ofw_bus interface */
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DEVMETHOD(ofw_bus_get_devinfo, ofw_spibus_get_devinfo),
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DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat),
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DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model),
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DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name),
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DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node),
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DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type),
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DEVMETHOD_END
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};
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devclass_t ofw_spibus_devclass;
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DEFINE_CLASS_1(spibus, ofw_spibus_driver, ofw_spibus_methods,
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sizeof(struct spibus_softc), spibus_driver);
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DRIVER_MODULE(ofw_spibus, spi, ofw_spibus_driver, ofw_spibus_devclass, 0, 0);
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MODULE_VERSION(ofw_spibus, 1);
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MODULE_DEPEND(ofw_spibus, spibus, 1, 1, 1);
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