2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2009, Nathan Whitehorn <nwhitehorn@FreeBSD.org>
5 * Copyright (c) 2013 The FreeBSD Foundation
8 * Portions of this software were developed by Oleksandr Rybalko
9 * under sponsorship from the FreeBSD Foundation.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice unmodified, this list of conditions, and the following
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/libkern.h>
38 #include <sys/module.h>
39 #include <sys/mutex.h>
41 #include <dev/fdt/fdt_common.h>
42 #include <dev/spibus/spi.h>
43 #include <dev/spibus/spibusvar.h>
44 #include <dev/ofw/ofw_bus.h>
45 #include <dev/ofw/ofw_bus_subr.h>
46 #include <dev/ofw/openfirm.h>
48 #include "spibus_if.h"
50 struct ofw_spibus_devinfo {
51 struct spibus_ivar opd_dinfo;
52 struct ofw_bus_devinfo opd_obdinfo;
56 static device_probe_t ofw_spibus_probe;
57 static device_attach_t ofw_spibus_attach;
58 static device_t ofw_spibus_add_child(device_t dev, u_int order,
59 const char *name, int unit);
60 static const struct ofw_bus_devinfo *ofw_spibus_get_devinfo(device_t bus,
64 ofw_spibus_probe(device_t dev)
67 if (ofw_bus_get_node(dev) == -1)
69 device_set_desc(dev, "OFW SPI bus");
71 return (BUS_PROBE_DEFAULT + 1);
75 ofw_spibus_attach(device_t dev)
77 struct spibus_softc *sc = device_get_softc(dev);
78 struct ofw_spibus_devinfo *dinfo;
82 uint32_t mode = SPIBUS_MODE_NONE;
86 bus_generic_probe(dev);
87 bus_enumerate_hinted_children(dev);
90 * Attach those children represented in the device tree.
92 for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
93 child = OF_peer(child)) {
95 * Try to get the CS number first from the spi-chipselect
96 * property, then try the reg property.
98 if (OF_getencprop(child, "spi-chipselect", &paddr,
99 sizeof(paddr)) == -1) {
100 if (OF_getencprop(child, "reg", &paddr,
101 sizeof(paddr)) == -1)
106 * Try to get the cpol/cpha mode
108 if (OF_hasprop(child, "spi-cpol"))
109 mode = SPIBUS_MODE_CPOL;
110 if (OF_hasprop(child, "spi-cpha")) {
111 if (mode == SPIBUS_MODE_CPOL)
112 mode = SPIBUS_MODE_CPOL_CPHA;
114 mode = SPIBUS_MODE_CPHA;
118 * Try to get the CS polarity
120 if (OF_hasprop(child, "spi-cs-high"))
121 paddr |= SPIBUS_CS_HIGH;
124 * Get the maximum clock frequency for device, zero means
125 * use the default bus speed.
127 * XXX Note that the current (2018-04-07) dts bindings say that
128 * spi-max-frequency is a required property (but says nothing of
129 * how to interpret a value of zero).
131 if (OF_getencprop(child, "spi-max-frequency", &clock,
132 sizeof(clock)) == -1)
136 * Now set up the SPI and OFW bus layer devinfo and add it
139 dinfo = malloc(sizeof(struct ofw_spibus_devinfo), M_DEVBUF,
143 dinfo->opd_dinfo.cs = paddr;
144 dinfo->opd_dinfo.clock = clock;
145 dinfo->opd_dinfo.mode = mode;
146 if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) !=
148 free(dinfo, M_DEVBUF);
151 childdev = device_add_child(dev, NULL, -1);
153 resource_list_init(&dinfo->opd_dinfo.rl);
154 ofw_bus_intr_to_rl(childdev, child,
155 &dinfo->opd_dinfo.rl, NULL);
156 device_set_ivars(childdev, dinfo);
159 return (bus_generic_attach(dev));
163 ofw_spibus_add_child(device_t dev, u_int order, const char *name, int unit)
166 struct ofw_spibus_devinfo *devi;
168 child = device_add_child_ordered(dev, order, name, unit);
171 devi = malloc(sizeof(struct ofw_spibus_devinfo), M_DEVBUF,
174 device_delete_child(dev, child);
179 * NULL all the OFW-related parts of the ivars for non-OFW
182 devi->opd_obdinfo.obd_node = -1;
183 devi->opd_obdinfo.obd_name = NULL;
184 devi->opd_obdinfo.obd_compat = NULL;
185 devi->opd_obdinfo.obd_type = NULL;
186 devi->opd_obdinfo.obd_model = NULL;
188 device_set_ivars(child, devi);
193 static const struct ofw_bus_devinfo *
194 ofw_spibus_get_devinfo(device_t bus, device_t dev)
196 struct ofw_spibus_devinfo *dinfo;
198 dinfo = device_get_ivars(dev);
199 return (&dinfo->opd_obdinfo);
202 static struct resource_list *
203 ofw_spibus_get_resource_list(device_t bus __unused, device_t child)
205 struct spibus_ivar *devi;
207 devi = SPIBUS_IVAR(child);
211 static device_method_t ofw_spibus_methods[] = {
212 /* Device interface */
213 DEVMETHOD(device_probe, ofw_spibus_probe),
214 DEVMETHOD(device_attach, ofw_spibus_attach),
217 DEVMETHOD(bus_child_pnpinfo, ofw_bus_gen_child_pnpinfo),
218 DEVMETHOD(bus_add_child, ofw_spibus_add_child),
219 DEVMETHOD(bus_get_resource_list, ofw_spibus_get_resource_list),
221 /* ofw_bus interface */
222 DEVMETHOD(ofw_bus_get_devinfo, ofw_spibus_get_devinfo),
223 DEVMETHOD(ofw_bus_get_compat, ofw_bus_gen_get_compat),
224 DEVMETHOD(ofw_bus_get_model, ofw_bus_gen_get_model),
225 DEVMETHOD(ofw_bus_get_name, ofw_bus_gen_get_name),
226 DEVMETHOD(ofw_bus_get_node, ofw_bus_gen_get_node),
227 DEVMETHOD(ofw_bus_get_type, ofw_bus_gen_get_type),
232 DEFINE_CLASS_1(spibus, ofw_spibus_driver, ofw_spibus_methods,
233 sizeof(struct spibus_softc), spibus_driver);
234 DRIVER_MODULE(ofw_spibus, spi, ofw_spibus_driver, 0, 0);
235 MODULE_VERSION(ofw_spibus, 1);
236 MODULE_DEPEND(ofw_spibus, spibus, 1, 1, 1);