1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2018 Emmanuel Vadot <manu@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/bus.h>
31 #include <sys/kernel.h>
32 #include <sys/resource.h>
33
34 #include <dev/ofw/ofw_bus.h>
35 #include <dev/ofw/ofw_bus_subr.h>
36
37 #include <dev/pwm/ofw_pwm.h>
38
39 int
pwm_get_by_ofw_propidx(device_t consumer,phandle_t node,const char * prop_name,int idx,pwm_channel_t * out_channel)40 pwm_get_by_ofw_propidx(device_t consumer, phandle_t node,
41 const char *prop_name, int idx, pwm_channel_t *out_channel)
42 {
43 phandle_t xref;
44 pcell_t *cells;
45 struct pwm_channel channel;
46 int ncells, rv;
47
48 rv = ofw_bus_parse_xref_list_alloc(node, prop_name, "#pwm-cells",
49 idx, &xref, &ncells, &cells);
50 if (rv != 0)
51 return (rv);
52
53 channel.dev = OF_device_from_xref(xref);
54 if (channel.dev == NULL) {
55 OF_prop_free(cells);
56 return (ENODEV);
57 }
58
59 channel.channel = cells[0];
60 channel.period = cells[1];
61
62 if (ncells >= 3)
63 channel.flags = cells[2];
64
65 *out_channel = malloc(sizeof(struct pwm_channel), M_DEVBUF, M_WAITOK | M_ZERO);
66 **out_channel = channel;
67 return (0);
68 }
69
70 int
pwm_get_by_ofw_idx(device_t consumer,phandle_t node,int idx,pwm_channel_t * out_channel)71 pwm_get_by_ofw_idx(device_t consumer, phandle_t node, int idx,
72 pwm_channel_t *out_channel)
73 {
74
75 return (pwm_get_by_ofw_propidx(consumer, node, "pwms", idx, out_channel));
76 }
77
78 int
pwm_get_by_ofw_property(device_t consumer,phandle_t node,const char * prop_name,pwm_channel_t * out_channel)79 pwm_get_by_ofw_property(device_t consumer, phandle_t node,
80 const char *prop_name, pwm_channel_t *out_channel)
81 {
82
83 return (pwm_get_by_ofw_propidx(consumer, node, prop_name, 0, out_channel));
84 }
85
86 int
pwm_get_by_ofw_name(device_t consumer,phandle_t node,const char * name,pwm_channel_t * out_channel)87 pwm_get_by_ofw_name(device_t consumer, phandle_t node, const char *name,
88 pwm_channel_t *out_channel)
89 {
90 int rv, idx;
91
92 rv = ofw_bus_find_string_index(node, "pwm-names", name, &idx);
93 if (rv != 0)
94 return (rv);
95
96 return (pwm_get_by_ofw_idx(consumer, node, idx, out_channel));
97 }
98