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
46MALLOC_DECLARE(M_HWRESET);
47
48struct hwreset_array {
49	hwreset_t *rst_array;
50	int	count;
51};
52
53int
54hwreset_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
67int
68hwreset_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
81void
82hwreset_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
94int
95hwreset_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