1 files changed, 208 insertions, 0 deletions
diff --git a/core/fdt.c b/core/fdt.c
new file mode 100644
index 00000000..62e60fcc
--- /dev/null
+++ b/core/fdt.c
@@ -0,0 +1,208 @@
+/* Copyright 2013-2014 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * 	http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <skiboot.h>
+#include <stdarg.h>
+#include <libfdt.h>
+#include <device.h>
+#include <cpu.h>
+#include <memory.h>
+#include <opal.h>
+#include <interrupts.h>
+#include <fsp.h>
+#include <cec.h>
+#include <vpd.h>
+#include <ccan/str/str.h>
+
+static int fdt_error;
+static void *fdt;
+
+#undef DEBUG_FDT
+
+static void __save_err(int err, const char *str)
+{
+#ifdef DEBUG_FDT
+	printf("FDT: rc: %d from \"%s\"\n", err, str);
+#endif
+	if (err && !fdt_error) {
+		prerror("FDT: Error %d from \"%s\"\n", err, str);
+		fdt_error = err;
+	}
+}
+
+#define save_err(...) __save_err(__VA_ARGS__, #__VA_ARGS__)
+
+static void dt_property_cell(const char *name, u32 cell)
+{
+	save_err(fdt_property_cell(fdt, name, cell));
+}
+
+static void dt_begin_node(const char *name, uint32_t phandle)
+{
+	save_err(fdt_begin_node(fdt, name));
+
+	/*
+	 * We add both the new style "phandle" and the legacy
+	 * "linux,phandle" properties
+	 */
+	dt_property_cell("linux,phandle", phandle);
+	dt_property_cell("phandle", phandle);
+}
+
+static void dt_property(const char *name, const void *val, size_t size)
+{
+	save_err(fdt_property(fdt, name, val, size));
+}
+
+static void dt_end_node(void)
+{
+	save_err(fdt_end_node(fdt));
+}
+
+static void dump_fdt(void)
+{
+#ifdef DEBUG_FDT
+	int i, off, depth, err;
+
+	printf("Device tree %u@%p\n", fdt_totalsize(fdt), fdt);
+
+	err = fdt_check_header(fdt);
+	if (err) {
+		prerror("fdt_check_header: %s\n", fdt_strerror(err));
+		return;
+	}
+	printf("fdt_check_header passed\n");
+
+	printf("fdt_num_mem_rsv = %u\n", fdt_num_mem_rsv(fdt));
+	for (i = 0; i < fdt_num_mem_rsv(fdt); i++) {
+		u64 addr, size;
+
+		err = fdt_get_mem_rsv(fdt, i, &addr, &size);
+		if (err) {
+			printf(" ERR %s\n", fdt_strerror(err));
+			return;
+		}
+		printf("  mem_rsv[%i] = %lu@%#lx\n", i, (long)addr, (long)size);
+	}
+
+	for (off = fdt_next_node(fdt, 0, &depth);
+	     off > 0;
+	     off = fdt_next_node(fdt, off, &depth)) {
+		int len;
+		const char *name;
+
+		name = fdt_get_name(fdt, off, &len);
+		if (!name) {
+			prerror("fdt: offset %i no name!\n", off);
+			return;
+		}
+		printf("name: %s [%u]\n", name, off);
+	}
+#endif
+}
+
+static void flatten_dt_node(const struct dt_node *root)
+{
+	const struct dt_node *i;
+	const struct dt_property *p;
+
+#ifdef DEBUG_FDT
+	printf("FDT: node: %s\n", root->name);
+#endif
+
+	list_for_each(&root->properties, p, list) {
+		if (strstarts(p->name, DT_PRIVATE))
+			continue;
+#ifdef DEBUG_FDT
+		printf("FDT:   prop: %s size: %ld\n", p->name, p->len);
+#endif
+		dt_property(p->name, p->prop, p->len);
+	}
+
+	list_for_each(&root->children, i, list) {
+		dt_begin_node(i->name, i->phandle);
+		flatten_dt_node(i);
+		dt_end_node();
+	}
+}
+
+static void create_dtb_reservemap(const struct dt_node *root)
+{
+	uint64_t base, size;
+	const uint64_t *ranges;
+	const struct dt_property *prop;
+	int i;
+
+	/* Duplicate the reserved-ranges property into the fdt reservemap */
+	prop = dt_find_property(root, "reserved-ranges");
+	if (prop) {
+		ranges = (const void *)prop->prop;
+
+		for (i = 0; i < prop->len / (sizeof(uint64_t) * 2); i++) {
+			base = *(ranges++);
+			size = *(ranges++);
+			save_err(fdt_add_reservemap_entry(fdt, base, size));
+		}
+	}
+
+	save_err(fdt_finish_reservemap(fdt));
+}
+
+void *create_dtb(const struct dt_node *root)
+{
+	size_t len = DEVICE_TREE_MAX_SIZE;
+	uint32_t old_last_phandle = last_phandle;
+
+	do {
+		if (fdt)
+			free(fdt);
+		last_phandle = old_last_phandle;
+		fdt_error = 0;
+		fdt = malloc(len);
+		if (!fdt) {
+			prerror("dtb: could not malloc %lu\n", (long)len);
+			return NULL;
+		}
+
+		fdt_create(fdt, len);
+
+		create_dtb_reservemap(root);
+
+		/* Open root node */
+		dt_begin_node(root->name, root->phandle);
+
+		/* Unflatten our live tree */
+		flatten_dt_node(root);
+
+		/* Close root node */
+		dt_end_node();
+
+		save_err(fdt_finish(fdt));
+
+		if (!fdt_error)
+			break;
+
+		len *= 2;
+	} while (fdt_error == -FDT_ERR_NOSPACE);
+
+	dump_fdt();
+
+	if (fdt_error) {
+		prerror("dtb: error %s\n", fdt_strerror(fdt_error));
+		return NULL;
+	}
+	return fdt;
+}