hwreset.c revision 308324 
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/11/sys/dev/extres/hwreset/hwreset.c 308324 2016-11-05 04:17:32Z 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
45struct hwreset {
46	device_t consumer_dev;		/* consumer device*/
47	device_t provider_dev;		/* provider device*/
48	int 	rst_id;			/* reset id */
49};
50
51MALLOC_DEFINE(M_HWRESET, "hwreset", "Reset framework");
52
53int
54hwreset_assert(hwreset_t rst)
55{
56
57	return (HWRESET_ASSERT(rst->provider_dev, rst->rst_id, true));
58}
59
60int
61hwreset_deassert(hwreset_t rst)
62{
63
64	return (HWRESET_ASSERT(rst->provider_dev, rst->rst_id, false));
65}
66
67int
68hwreset_is_asserted(hwreset_t rst, bool *value)
69{
70
71	return (HWRESET_IS_ASSERTED(rst->provider_dev, rst->rst_id, value));
72}
73
74void
75hwreset_release(hwreset_t rst)
76{
77	free(rst, M_HWRESET);
78}
79
80int
81hwreset_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
97int
98hwreset_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
111int
112hwreset_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
149int
150hwreset_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
168void
169hwreset_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
181void
182hwreset_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