1 /* $NetBSD: fdt_spi.c,v 1.3 2021/08/07 16:19:10 thorpej Exp $ */
2
3 /*
4 * Copyright (c) 2019 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Tobias Nygren.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: fdt_spi.c,v 1.3 2021/08/07 16:19:10 thorpej Exp $");
34
35 #include <sys/param.h>
36 #include <sys/device.h>
37 #include <sys/bus.h>
38 #include <sys/kmem.h>
39 #include <sys/queue.h>
40 #include <dev/spi/spivar.h>
41 #include <libfdt.h>
42 #include <dev/fdt/fdtvar.h>
43
44 struct fdtbus_spi_controller {
45 device_t spi_dev;
46 int spi_phandle;
47 const struct fdtbus_spi_controller_func *spi_funcs;
48 LIST_ENTRY(fdtbus_spi_controller) spi_next;
49 };
50
51 static LIST_HEAD(, fdtbus_spi_controller) fdtbus_spi_controllers =
52 LIST_HEAD_INITIALIZER(fdtbus_spi_controllers);
53
54 int
fdtbus_register_spi_controller(device_t dev,int phandle,const struct fdtbus_spi_controller_func * funcs)55 fdtbus_register_spi_controller(device_t dev, int phandle,
56 const struct fdtbus_spi_controller_func *funcs)
57 {
58 struct fdtbus_spi_controller *spi;
59
60 spi = kmem_alloc(sizeof(*spi), KM_SLEEP);
61 spi->spi_dev = dev;
62 spi->spi_phandle = phandle;
63 spi->spi_funcs = funcs;
64
65 LIST_INSERT_HEAD(&fdtbus_spi_controllers, spi, spi_next);
66
67 return 0;
68 }
69
70 static struct spi_controller *
fdtbus_get_spi_controller(int phandle)71 fdtbus_get_spi_controller(int phandle)
72 {
73 struct fdtbus_spi_controller *spi;
74
75 LIST_FOREACH(spi, &fdtbus_spi_controllers, spi_next) {
76 if (spi->spi_phandle == phandle) {
77 return spi->spi_funcs->get_controller(spi->spi_dev);
78 }
79 }
80 return NULL;
81 }
82
83 device_t
fdtbus_attach_spibus(device_t dev,int phandle,cfprint_t print)84 fdtbus_attach_spibus(device_t dev, int phandle, cfprint_t print)
85 {
86 struct spi_controller *spi;
87 struct spibus_attach_args sba;
88 prop_dictionary_t devs;
89 device_t ret;
90 u_int address_cells;
91
92 devs = prop_dictionary_create();
93 if (of_getprop_uint32(phandle, "#address-cells", &address_cells))
94 address_cells = 1;
95 of_enter_spi_devs(devs, phandle, address_cells * 4);
96
97 spi = fdtbus_get_spi_controller(phandle);
98 KASSERT(spi != NULL);
99 memset(&sba, 0, sizeof(sba));
100 sba.sba_controller = spi;
101
102 sba.sba_child_devices = prop_dictionary_get(devs, "spi-child-devices");
103 if (sba.sba_child_devices)
104 prop_object_retain(sba.sba_child_devices);
105 prop_object_release(devs);
106
107 ret = config_found(dev, &sba, print,
108 CFARGS(.iattr = "spibus"));
109 if (sba.sba_child_devices)
110 prop_object_release(sba.sba_child_devices);
111
112 return ret;
113 }
114
115
116