1 /*-
2 * Copyright (c) 2014 Ian Lepore <ian@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
27 #include <sys/param.h>
28
29 #include <dev/ofw/ofw_bus.h>
30 #include <dev/ofw/ofw_bus_subr.h>
31
32 #include "fdt_pinctrl_if.h"
33
34 #include <dev/fdt/fdt_common.h>
35 #include <dev/fdt/fdt_pinctrl.h>
36
37 int
fdt_pinctrl_configure(device_t client,u_int index)38 fdt_pinctrl_configure(device_t client, u_int index)
39 {
40 device_t pinctrl;
41 phandle_t *configs;
42 int i, nconfigs;
43 char name[16];
44
45 snprintf(name, sizeof(name), "pinctrl-%u", index);
46 nconfigs = OF_getencprop_alloc_multi(ofw_bus_get_node(client), name,
47 sizeof(*configs), (void **)&configs);
48 if (nconfigs < 0)
49 return (ENOENT);
50 if (nconfigs == 0)
51 return (0); /* Empty property is documented as valid. */
52 for (i = 0; i < nconfigs; i++) {
53 if ((pinctrl = OF_device_from_xref(configs[i])) != NULL)
54 FDT_PINCTRL_CONFIGURE(pinctrl, configs[i]);
55 }
56 OF_prop_free(configs);
57 return (0);
58 }
59
60 int
fdt_pinctrl_configure_by_name(device_t client,const char * name)61 fdt_pinctrl_configure_by_name(device_t client, const char * name)
62 {
63 char * names;
64 int i, offset, nameslen;
65
66 nameslen = OF_getprop_alloc(ofw_bus_get_node(client), "pinctrl-names",
67 (void **)&names);
68 if (nameslen <= 0)
69 return (ENOENT);
70 for (i = 0, offset = 0; offset < nameslen; i++) {
71 if (strcmp(name, &names[offset]) == 0)
72 break;
73 offset += strlen(&names[offset]) + 1;
74 }
75 OF_prop_free(names);
76 if (offset < nameslen)
77 return (fdt_pinctrl_configure(client, i));
78 else
79 return (ENOENT);
80 }
81
82 static int
pinctrl_register_children(device_t pinctrl,phandle_t parent,const char * pinprop)83 pinctrl_register_children(device_t pinctrl, phandle_t parent,
84 const char *pinprop)
85 {
86 phandle_t node;
87
88 /*
89 * Recursively descend from parent, looking for nodes that have the
90 * given property, and associate the pinctrl device_t with each one.
91 */
92 for (node = OF_child(parent); node != 0; node = OF_peer(node)) {
93 pinctrl_register_children(pinctrl, node, pinprop);
94 if (pinprop == NULL || OF_hasprop(node, pinprop)) {
95 OF_device_register_xref(OF_xref_from_node(node),
96 pinctrl);
97 }
98 }
99 return (0);
100 }
101
102 int
fdt_pinctrl_register(device_t pinctrl,const char * pinprop)103 fdt_pinctrl_register(device_t pinctrl, const char *pinprop)
104 {
105 phandle_t node;
106 int ret;
107
108 TSENTER();
109 node = ofw_bus_get_node(pinctrl);
110 OF_device_register_xref(OF_xref_from_node(node), pinctrl);
111 ret = pinctrl_register_children(pinctrl, node, pinprop);
112 TSEXIT();
113
114 return (ret);
115 }
116
117 static int
pinctrl_configure_children(device_t pinctrl,phandle_t parent)118 pinctrl_configure_children(device_t pinctrl, phandle_t parent)
119 {
120 phandle_t node, *configs;
121 int i, nconfigs;
122
123 TSENTER();
124
125 for (node = OF_child(parent); node != 0; node = OF_peer(node)) {
126 if (!ofw_bus_node_status_okay(node))
127 continue;
128 pinctrl_configure_children(pinctrl, node);
129 nconfigs = OF_getencprop_alloc_multi(node, "pinctrl-0",
130 sizeof(*configs), (void **)&configs);
131 if (nconfigs <= 0)
132 continue;
133 if (bootverbose) {
134 char name[32];
135 OF_getprop(node, "name", &name, sizeof(name));
136 printf("Processing %d pin-config node(s) in pinctrl-0 for %s\n",
137 nconfigs, name);
138 }
139 for (i = 0; i < nconfigs; i++) {
140 if (OF_device_from_xref(configs[i]) == pinctrl)
141 FDT_PINCTRL_CONFIGURE(pinctrl, configs[i]);
142 }
143 OF_prop_free(configs);
144 }
145 TSEXIT();
146 return (0);
147 }
148
149 int
fdt_pinctrl_configure_tree(device_t pinctrl)150 fdt_pinctrl_configure_tree(device_t pinctrl)
151 {
152
153 return (pinctrl_configure_children(pinctrl, OF_peer(0)));
154 }
155
156