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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  * $FreeBSD$
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
54 hwreset_assert(hwreset_t rst)
55 {
56
57         return (HWRESET_ASSERT(rst->provider_dev, rst->rst_id, true));
58 }
59
60 int
61 hwreset_deassert(hwreset_t rst)
62 {
63
64         return (HWRESET_ASSERT(rst->provider_dev, rst->rst_id, false));
65 }
66
67 int
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
75 hwreset_release(hwreset_t rst)
76 {
77         free(rst, M_HWRESET);
78 }
79
80 int
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
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
112 hwreset_get_by_ofw_idx(device_t consumer_dev, int idx, hwreset_t *rst)
113 {
114         phandle_t cnode, xnode;
115         pcell_t *cells;
116         device_t rstdev;
117         int ncells, rv;
118         intptr_t id;
119
120         cnode = ofw_bus_get_node(consumer_dev);
121         if (cnode <= 0) {
122                 device_printf(consumer_dev,
123                     "%s called on not ofw based device\n", __func__);
124                 return (ENXIO);
125         }
126
127         rv = ofw_bus_parse_xref_list_alloc(cnode, "resets", "#reset-cells",
128             idx, &xnode, &ncells, &cells);
129         if (rv != 0)
130                 return (rv);
131
132         /* Tranlate provider to device */
133         rstdev = OF_device_from_xref(xnode);
134         if (rstdev == NULL) {
135                 OF_prop_free(cells);
136                 return (ENODEV);
137         }
138         /* Map reset to number */
139         rv = HWRESET_MAP(rstdev, xnode, ncells, cells, &id);
140         OF_prop_free(cells);
141         if (rv != 0)
142                 return (rv);
143
144         return (hwreset_get_by_id(consumer_dev, rstdev, id, rst));
145 }
146
147 int
148 hwreset_get_by_ofw_name(device_t consumer_dev, char *name, hwreset_t *rst)
149 {
150         int rv, idx;
151         phandle_t cnode;
152
153         cnode = ofw_bus_get_node(consumer_dev);
154         if (cnode <= 0) {
155                 device_printf(consumer_dev,
156                     "%s called on not ofw based device\n",  __func__);
157                 return (ENXIO);
158         }
159         rv = ofw_bus_find_string_index(cnode, "reset-names", name, &idx);
160         if (rv != 0)
161                 return (rv);
162         return (hwreset_get_by_ofw_idx(consumer_dev, idx, rst));
163 }
164
165 void
166 hwreset_register_ofw_provider(device_t provider_dev)
167 {
168         phandle_t xref, node;
169
170         node = ofw_bus_get_node(provider_dev);
171         if (node <= 0)
172                 panic("%s called on not ofw based device.\n", __func__);
173
174         xref = OF_xref_from_node(node);
175         OF_device_register_xref(xref, provider_dev);
176 }
177
178 void
179 hwreset_unregister_ofw_provider(device_t provider_dev)
180 {
181         phandle_t xref;
182
183         xref = OF_xref_from_device(provider_dev);
184         OF_device_register_xref(xref, NULL);
185 }
186 #endif