1 /*-
2 * Copyright 2016 Michal Meloun <mmel@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: stable/12/sys/dev/extres/hwreset/hwreset.c 302528 2016-07-10 18:28:15Z mmel $
27 */
28 #include "opt_platform.h"
29 #include <sys/cdefs.h>
30 #include <sys/param.h>
31 #include <sys/kernel.h>
32 #include <sys/kobj.h>
33 #include <sys/malloc.h>
34 #include <sys/systm.h>
35
36 #ifdef FDT
37 #include <dev/ofw/ofw_bus.h>
38 #include <dev/ofw/ofw_bus_subr.h>
39 #endif
40
41 #include <dev/extres/hwreset/hwreset.h>
42
43 #include "hwreset_if.h"
44
45 struct hwreset {
46 device_t consumer_dev; /* consumer device*/
47 device_t provider_dev; /* provider device*/
48 int rst_id; /* reset id */
49 };
50
51 MALLOC_DEFINE(M_HWRESET, "hwreset", "Reset framework");
52
53 int
hwreset_assert(hwreset_t rst)54 hwreset_assert(hwreset_t rst)
55 {
56
57 return (HWRESET_ASSERT(rst->provider_dev, rst->rst_id, true));
58 }
59
60 int
hwreset_deassert(hwreset_t rst)61 hwreset_deassert(hwreset_t rst)
62 {
63
64 return (HWRESET_ASSERT(rst->provider_dev, rst->rst_id, false));
65 }
66
67 int
hwreset_is_asserted(hwreset_t rst,bool * value)68 hwreset_is_asserted(hwreset_t rst, bool *value)
69 {
70
71 return (HWRESET_IS_ASSERTED(rst->provider_dev, rst->rst_id, value));
72 }
73
74 void
hwreset_release(hwreset_t rst)75 hwreset_release(hwreset_t rst)
76 {
77 free(rst, M_HWRESET);
78 }
79
80 int
hwreset_get_by_id(device_t consumer_dev,device_t provider_dev,intptr_t id,hwreset_t * rst_out)81 hwreset_get_by_id(device_t consumer_dev, device_t provider_dev, intptr_t id,
82 hwreset_t *rst_out)
83 {
84 hwreset_t rst;
85
86 /* Create handle */
87 rst = malloc(sizeof(struct hwreset), M_HWRESET,
88 M_WAITOK | M_ZERO);
89 rst->consumer_dev = consumer_dev;
90 rst->provider_dev = provider_dev;
91 rst->rst_id = id;
92 *rst_out = rst;
93 return (0);
94 }
95
96 #ifdef FDT
97 int
hwreset_default_ofw_map(device_t provider_dev,phandle_t xref,int ncells,pcell_t * cells,intptr_t * id)98 hwreset_default_ofw_map(device_t provider_dev, phandle_t xref, int ncells,
99 pcell_t *cells, intptr_t *id)
100 {
101 if (ncells == 0)
102 *id = 1;
103 else if (ncells == 1)
104 *id = cells[0];
105 else
106 return (ERANGE);
107
108 return (0);
109 }
110
111 int
hwreset_get_by_ofw_idx(device_t consumer_dev,phandle_t cnode,int idx,hwreset_t * rst)112 hwreset_get_by_ofw_idx(device_t consumer_dev, phandle_t cnode, int idx,
113 hwreset_t *rst)
114 {
115 phandle_t xnode;
116 pcell_t *cells;
117 device_t rstdev;
118 int ncells, rv;
119 intptr_t id;
120
121 if (cnode <= 0)
122 cnode = ofw_bus_get_node(consumer_dev);
123 if (cnode <= 0) {
124 device_printf(consumer_dev,
125 "%s called on not ofw based device\n", __func__);
126 return (ENXIO);
127 }
128
129 rv = ofw_bus_parse_xref_list_alloc(cnode, "resets", "#reset-cells",
130 idx, &xnode, &ncells, &cells);
131 if (rv != 0)
132 return (rv);
133
134 /* Tranlate provider to device */
135 rstdev = OF_device_from_xref(xnode);
136 if (rstdev == NULL) {
137 OF_prop_free(cells);
138 return (ENODEV);
139 }
140 /* Map reset to number */
141 rv = HWRESET_MAP(rstdev, xnode, ncells, cells, &id);
142 OF_prop_free(cells);
143 if (rv != 0)
144 return (rv);
145
146 return (hwreset_get_by_id(consumer_dev, rstdev, id, rst));
147 }
148
149 int
hwreset_get_by_ofw_name(device_t consumer_dev,phandle_t cnode,char * name,hwreset_t * rst)150 hwreset_get_by_ofw_name(device_t consumer_dev, phandle_t cnode, char *name,
151 hwreset_t *rst)
152 {
153 int rv, idx;
154
155 if (cnode <= 0)
156 cnode = ofw_bus_get_node(consumer_dev);
157 if (cnode <= 0) {
158 device_printf(consumer_dev,
159 "%s called on not ofw based device\n", __func__);
160 return (ENXIO);
161 }
162 rv = ofw_bus_find_string_index(cnode, "reset-names", name, &idx);
163 if (rv != 0)
164 return (rv);
165 return (hwreset_get_by_ofw_idx(consumer_dev, cnode, idx, rst));
166 }
167
168 void
hwreset_register_ofw_provider(device_t provider_dev)169 hwreset_register_ofw_provider(device_t provider_dev)
170 {
171 phandle_t xref, node;
172
173 node = ofw_bus_get_node(provider_dev);
174 if (node <= 0)
175 panic("%s called on not ofw based device.\n", __func__);
176
177 xref = OF_xref_from_node(node);
178 OF_device_register_xref(xref, provider_dev);
179 }
180
181 void
hwreset_unregister_ofw_provider(device_t provider_dev)182 hwreset_unregister_ofw_provider(device_t provider_dev)
183 {
184 phandle_t xref;
185
186 xref = OF_xref_from_device(provider_dev);
187 OF_device_register_xref(xref, NULL);
188 }
189 #endif
190