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-rw-r--r--lib/Makefile1
-rw-r--r--lib/fdtdec.c147
2 files changed, 148 insertions, 0 deletions
diff --git a/lib/Makefile b/lib/Makefile
index 075bb8c..54708c2 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -38,6 +38,7 @@ COBJS-y += crc16.o
COBJS-y += crc32.o
COBJS-y += display_options.o
COBJS-y += errno.o
+COBJS-$(CONFIG_OF_CONTROL) += fdtdec.o
COBJS-$(CONFIG_GZIP) += gunzip.o
COBJS-y += hashtable.o
COBJS-$(CONFIG_LMB) += lmb.o
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
new file mode 100644
index 0000000..0f87163
--- /dev/null
+++ b/lib/fdtdec.c
@@ -0,0 +1,147 @@
+/*
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <serial.h>
+#include <libfdt.h>
+#include <fdtdec.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Here are the type we know about. One day we might allow drivers to
+ * register. For now we just put them here. The COMPAT macro allows us to
+ * turn this into a sparse list later, and keeps the ID with the name.
+ */
+#define COMPAT(id, name) name
+static const char * const compat_names[COMPAT_COUNT] = {
+};
+
+/**
+ * Look in the FDT for an alias with the given name and return its node.
+ *
+ * @param blob FDT blob
+ * @param name alias name to look up
+ * @return node offset if found, or an error code < 0 otherwise
+ */
+static int find_alias_node(const void *blob, const char *name)
+{
+ const char *path;
+ int alias_node;
+
+ debug("find_alias_node: %s\n", name);
+ alias_node = fdt_path_offset(blob, "/aliases");
+ if (alias_node < 0)
+ return alias_node;
+ path = fdt_getprop(blob, alias_node, name, NULL);
+ if (!path)
+ return -FDT_ERR_NOTFOUND;
+ return fdt_path_offset(blob, path);
+}
+
+fdt_addr_t fdtdec_get_addr(const void *blob, int node,
+ const char *prop_name)
+{
+ const fdt_addr_t *cell;
+ int len;
+
+ debug("get_addr: %s\n", prop_name);
+ cell = fdt_getprop(blob, node, prop_name, &len);
+ if (cell && (len == sizeof(fdt_addr_t) ||
+ len == sizeof(fdt_addr_t) * 2))
+ return fdt_addr_to_cpu(*cell);
+ return FDT_ADDR_T_NONE;
+}
+
+s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
+ s32 default_val)
+{
+ const s32 *cell;
+ int len;
+
+ debug("get_size: %s\n", prop_name);
+ cell = fdt_getprop(blob, node, prop_name, &len);
+ if (cell && len >= sizeof(s32))
+ return fdt32_to_cpu(cell[0]);
+ return default_val;
+}
+
+int fdtdec_get_is_enabled(const void *blob, int node, int default_val)
+{
+ const char *cell;
+
+ cell = fdt_getprop(blob, node, "status", NULL);
+ if (cell)
+ return 0 == strcmp(cell, "ok");
+ return default_val;
+}
+
+enum fdt_compat_id fd_dec_lookup(const void *blob, int node)
+{
+ enum fdt_compat_id id;
+
+ /* Search our drivers */
+ for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
+ if (0 == fdt_node_check_compatible(blob, node,
+ compat_names[id]))
+ return id;
+ return COMPAT_UNKNOWN;
+}
+
+int fdtdec_next_compatible(const void *blob, int node,
+ enum fdt_compat_id id)
+{
+ return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
+}
+
+int fdtdec_next_alias(const void *blob, const char *name,
+ enum fdt_compat_id id, int *upto)
+{
+#define MAX_STR_LEN 20
+ char str[MAX_STR_LEN + 20];
+ int node, err;
+
+ /* snprintf() is not available */
+ assert(strlen(name) < MAX_STR_LEN);
+ sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
+ (*upto)++;
+ node = find_alias_node(blob, str);
+ if (node < 0)
+ return node;
+ err = fdt_node_check_compatible(blob, node, compat_names[id]);
+ if (err < 0)
+ return err;
+ return err ? -FDT_ERR_NOTFOUND : node;
+}
+
+/*
+ * This function is a little odd in that it accesses global data. At some
+ * point if the architecture board.c files merge this will make more sense.
+ * Even now, it is common code.
+ */
+int fdtdec_check_fdt(void)
+{
+ /* We must have an fdt */
+ if (fdt_check_header(gd->fdt_blob))
+ panic("No valid fdt found - please append one to U-Boot\n"
+ "binary or define CONFIG_OF_EMBED\n");
+ return 0;
+}