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authorSimon Glass <sjg@chromium.org>2013-06-13 15:10:08 -0700
committerTom Rini <trini@ti.com>2013-06-26 10:18:56 -0400
commit3e06cd1f97792b4bc3882de1ac99f031fb0eaa80 (patch)
tree0e446d007942ebcbc96e0a4f2c63c5be8a24c786 /lib
parent399c744b22459585dc2dda2cb7353b3026e28e18 (diff)
libfdt: Add fdt_find_regions()
Add a function to find regions in device tree given a list of nodes to include and properties to exclude. See the header file for full documentation. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/libfdt/fdt_wip.c129
1 files changed, 129 insertions, 0 deletions
diff --git a/lib/libfdt/fdt_wip.c b/lib/libfdt/fdt_wip.c
index 63e67b78c88..b9e3c4a7421 100644
--- a/lib/libfdt/fdt_wip.c
+++ b/lib/libfdt/fdt_wip.c
@@ -120,3 +120,132 @@ int fdt_nop_node(void *fdt, int nodeoffset)
endoffset - nodeoffset);
return 0;
}
+
+#define FDT_MAX_DEPTH 32
+
+static int str_in_list(const char *str, char * const list[], int count)
+{
+ int i;
+
+ for (i = 0; i < count; i++)
+ if (!strcmp(list[i], str))
+ return 1;
+
+ return 0;
+}
+
+int fdt_find_regions(const void *fdt, char * const inc[], int inc_count,
+ char * const exc_prop[], int exc_prop_count,
+ struct fdt_region region[], int max_regions,
+ char *path, int path_len, int add_string_tab)
+{
+ int stack[FDT_MAX_DEPTH];
+ char *end;
+ int nextoffset = 0;
+ uint32_t tag;
+ int count = 0;
+ int start = -1;
+ int depth = -1;
+ int want = 0;
+ int base = fdt_off_dt_struct(fdt);
+
+ end = path;
+ *end = '\0';
+ do {
+ const struct fdt_property *prop;
+ const char *name;
+ const char *str;
+ int include = 0;
+ int stop_at = 0;
+ int offset;
+ int len;
+
+ offset = nextoffset;
+ tag = fdt_next_tag(fdt, offset, &nextoffset);
+ stop_at = nextoffset;
+
+ switch (tag) {
+ case FDT_PROP:
+ include = want >= 2;
+ stop_at = offset;
+ prop = fdt_get_property_by_offset(fdt, offset, NULL);
+ str = fdt_string(fdt, fdt32_to_cpu(prop->nameoff));
+ if (str_in_list(str, exc_prop, exc_prop_count))
+ include = 0;
+ break;
+
+ case FDT_NOP:
+ include = want >= 2;
+ stop_at = offset;
+ break;
+
+ case FDT_BEGIN_NODE:
+ depth++;
+ if (depth == FDT_MAX_DEPTH)
+ return -FDT_ERR_BADSTRUCTURE;
+ name = fdt_get_name(fdt, offset, &len);
+ if (end - path + 2 + len >= path_len)
+ return -FDT_ERR_NOSPACE;
+ if (end != path + 1)
+ *end++ = '/';
+ strcpy(end, name);
+ end += len;
+ stack[depth] = want;
+ if (want == 1)
+ stop_at = offset;
+ if (str_in_list(path, inc, inc_count))
+ want = 2;
+ else if (want)
+ want--;
+ else
+ stop_at = offset;
+ include = want;
+ break;
+
+ case FDT_END_NODE:
+ include = want;
+ want = stack[depth--];
+ while (end > path && *--end != '/')
+ ;
+ *end = '\0';
+ break;
+
+ case FDT_END:
+ include = 1;
+ break;
+ }
+
+ if (include && start == -1) {
+ /* Should we merge with previous? */
+ if (count && count <= max_regions &&
+ offset == region[count - 1].offset +
+ region[count - 1].size - base)
+ start = region[--count].offset - base;
+ else
+ start = offset;
+ }
+
+ if (!include && start != -1) {
+ if (count < max_regions) {
+ region[count].offset = base + start;
+ region[count].size = stop_at - start;
+ }
+ count++;
+ start = -1;
+ }
+ } while (tag != FDT_END);
+
+ if (nextoffset != fdt_size_dt_struct(fdt))
+ return -FDT_ERR_BADLAYOUT;
+
+ /* Add a region for the END tag and the string table */
+ if (count < max_regions) {
+ region[count].offset = base + start;
+ region[count].size = nextoffset - start;
+ if (add_string_tab)
+ region[count].size += fdt_size_dt_strings(fdt);
+ }
+ count++;
+
+ return count;
+}