1 /*-
2 * Copyright (c) 2022 The FreeBSD Foundation
3 *
4 * This software was developed by Andrew Turner under sponsorship from
5 * the FreeBSD Foundation.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /*
30 * This manages all hwresets for a device and asserts/deasserts them in
31 * an undefined order.
32 */
33
34 #include "opt_platform.h"
35
36 #include <sys/param.h>
37 #include <sys/malloc.h>
38
39 #ifdef FDT
40 #include <dev/ofw/ofw_bus.h>
41 #include <dev/ofw/ofw_bus_subr.h>
42 #endif
43
44 #include <dev/hwreset/hwreset.h>
45
46 MALLOC_DECLARE(M_HWRESET);
47
48 struct hwreset_array {
49 hwreset_t *rst_array;
50 int count;
51 };
52
53 int
hwreset_array_assert(hwreset_array_t rsts)54 hwreset_array_assert(hwreset_array_t rsts)
55 {
56 int i, rv;
57
58 for (i = 0; i < rsts->count; i++) {
59 rv = hwreset_assert(rsts->rst_array[i]);
60 if (rv != 0)
61 return (rv);
62 }
63
64 return (0);
65 }
66
67 int
hwreset_array_deassert(hwreset_array_t rsts)68 hwreset_array_deassert(hwreset_array_t rsts)
69 {
70 int i, rv;
71
72 for (i = 0; i < rsts->count; i++) {
73 rv = hwreset_deassert(rsts->rst_array[i]);
74 if (rv != 0)
75 return (rv);
76 }
77
78 return (0);
79 }
80
81 void
hwreset_array_release(hwreset_array_t rsts)82 hwreset_array_release(hwreset_array_t rsts)
83 {
84 int i;
85
86 for (i = 0; i < rsts->count; i++) {
87 hwreset_release(rsts->rst_array[i]);
88 }
89 free(rsts->rst_array, M_HWRESET);
90 free(rsts, M_HWRESET);
91 }
92
93 #ifdef FDT
94 int
hwreset_array_get_ofw(device_t consumer_dev,phandle_t cnode,hwreset_array_t * rsts)95 hwreset_array_get_ofw(device_t consumer_dev, phandle_t cnode,
96 hwreset_array_t *rsts)
97 {
98 hwreset_array_t resets;
99 int count, i, rv;
100
101 if (cnode <= 0)
102 cnode = ofw_bus_get_node(consumer_dev);
103 if (cnode <= 0) {
104 device_printf(consumer_dev,
105 "%s called on not ofw based device\n", __func__);
106 return (ENXIO);
107 }
108
109 rv = ofw_bus_parse_xref_list_get_length(cnode, "resets", "#reset-cells",
110 &count);
111 if (rv != 0)
112 return (rv);
113
114 resets = malloc(sizeof(struct hwreset_array), M_HWRESET,
115 M_WAITOK | M_ZERO);
116 resets->rst_array = mallocarray(count, sizeof(hwreset_t), M_HWRESET,
117 M_WAITOK | M_ZERO);
118
119 for (i = 0; i < count; i++) {
120 rv = hwreset_get_by_ofw_idx(consumer_dev, cnode, i,
121 &resets->rst_array[i]);
122 if (rv != 0)
123 break;
124 }
125
126 if (rv != 0) {
127 count = i;
128 for (i = 0; i < count; i++) {
129 hwreset_release(resets->rst_array[i]);
130 }
131 free(resets->rst_array, M_HWRESET);
132 free(resets, M_HWRESET);
133 } else {
134 resets->count = count;
135 *rsts = resets;
136 }
137 return (rv);
138 }
139 #endif
140