fdt_slicer.c revision 261077 
1/*-
2 * Copyright (c) 2012 Semihalf.
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/cdefs.h>
28__FBSDID("$FreeBSD: stable/10/sys/dev/fdt/fdt_slicer.c 261077 2014-01-23 12:02:04Z loos $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/kernel.h>
33#include <sys/module.h>
34#include <sys/slicer.h>
35
36#include <dev/fdt/fdt_common.h>
37
38#ifdef DEBUG
39#define debugf(fmt, args...) do { printf("%s(): ", __func__);	\
40    printf(fmt,##args); } while (0)
41#else
42#define debugf(fmt, args...)
43#endif
44
45int
46flash_fill_slices(device_t dev, struct flash_slice *slices, int *slices_num)
47{
48	char *slice_name;
49	phandle_t dt_node, dt_child;
50	u_long base, size;
51	int i;
52	ssize_t name_len;
53
54	/*
55	 * We assume the caller provides buffer for FLASH_SLICES_MAX_NUM
56	 * flash_slice structures.
57	 */
58	if (slices == NULL) {
59		*slices_num = 0;
60		return (ENOMEM);
61	}
62
63	dt_node = ofw_bus_get_node(dev);
64	for (dt_child = OF_child(dt_node), i = 0; dt_child != 0;
65	    dt_child = OF_peer(dt_child)) {
66
67		if (i == FLASH_SLICES_MAX_NUM) {
68			debugf("not enough buffer for slice i=%d\n", i);
69			break;
70		}
71
72		/*
73		 * Retrieve start and size of the slice.
74		 */
75		if (fdt_regsize(dt_child, &base, &size) != 0) {
76			debugf("error during processing reg property, i=%d\n",
77			    i);
78			continue;
79		}
80
81		if (size == 0) {
82			debugf("slice i=%d with no size\n", i);
83			continue;
84		}
85
86		/*
87		 * Retrieve label.
88		 */
89		name_len = OF_getprop_alloc(dt_child, "label", sizeof(char),
90		    (void **)&slice_name);
91		if (name_len <= 0) {
92			/* Use node name if no label defined */
93			name_len = OF_getprop_alloc(dt_child, "name", sizeof(char),
94			    (void **)&slice_name);
95			if (name_len <= 0) {
96				debugf("slice i=%d with no name\n", i);
97				slice_name = NULL;
98			}
99		}
100
101		/*
102		 * Fill slice entry data.
103		 */
104		slices[i].base = base;
105		slices[i].size = size;
106		slices[i].label = slice_name;
107		i++;
108	}
109
110	*slices_num = i;
111	return (0);
112}
113