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ofw_spibus.c
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spi.h
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spibus.c
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spibus_if.m
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spibusvar.h
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spigen.c
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Editing: ofw_spibus.c
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * 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); resource_list_init(&dinfo->opd_dinfo.rl); ofw_bus_intr_to_rl(childdev, child, &dinfo->opd_dinfo.rl, NULL); 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 struct resource_list * ofw_spibus_get_resource_list(device_t bus __unused, device_t child) { struct spibus_ivar *devi; devi = SPIBUS_IVAR(child); return (&devi->rl); } 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), DEVMETHOD(bus_get_resource_list, ofw_spibus_get_resource_list), /* 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 }; devclass_t ofw_spibus_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, ofw_spibus_devclass, 0, 0); MODULE_VERSION(ofw_spibus, 1); MODULE_DEPEND(ofw_spibus, spibus, 1, 1, 1);
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