[POWERPC] Use embedded libfdt in the bootwrapper

This incorporates libfdt (from the source embedded in an earlier
commit) into the wrapper.a library used by the bootwrapper.  This
includes adding a libfdt_env.h file, which the libfdt sources need in
order to integrate into the bootwrapper environment, and a
libfdt-wrapper.c which provides glue to connect the bootwrapper's
abstract device tree callbacks to the libfdt functions.

In addition, this changes the various wrapper and platform files to
use libfdt functions instead of the older flatdevtree.c library.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 182 insertions, 0 deletions

diff --git a/arch/powerpc/boot/libfdt-wrapper.c b/arch/powerpc/boot/libfdt-wrapper.c
new file mode 100644
index 000000000000..002da16c97c1
--- /dev/null
+++ b/arch/powerpc/boot/libfdt-wrapper.c
@@ -0,0 +1,182 @@
+/*
+ * This file does the necessary interface mapping between the bootwrapper
+ * device tree operations and the interface provided by shared source
+ * files flatdevicetree.[ch].
+ *
+ * Copyright 2007 David Gibson, IBM Corporation.
+ *
+ * This library 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 library 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 library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <stddef.h>
+#include <stdio.h>
+#include <page.h>
+#include <libfdt.h>
+#include "ops.h"
+
+#define DEBUG   0
+#define BAD_ERROR(err)  (((err) < 0) \
+                         && ((err) != -FDT_ERR_NOTFOUND) \
+                         && ((err) != -FDT_ERR_EXISTS))
+
+#define check_err(err) \
+        ({ \
+                if (BAD_ERROR(err) || ((err < 0) && DEBUG)) \
+                        printf("%s():%d  %s\n\r", __FUNCTION__, __LINE__, \
+                               fdt_strerror(err)); \
+                if (BAD_ERROR(err)) \
+                        exit(); \
+                (err < 0) ? -1 : 0; \
+        })
+
+#define offset_devp(off)        \
+        ({ \
+                int offset = (off); \
+                check_err(offset) ? NULL : (void *)(offset+1); \
+        })
+
+#define devp_offset(devp)       (((int)(devp))-1)
+
+static void *fdt;
+static void *buf; /* = NULL */
+
+#define EXPAND_GRANULARITY      1024
+
+static void expand_buf(int minexpand)
+{
+        int size = fdt_totalsize(fdt);
+        int rc;
+
+        size = _ALIGN(size + minexpand, EXPAND_GRANULARITY);
+        buf = platform_ops.realloc(buf, size);
+        if (!buf)
+                fatal("Couldn't find %d bytes to expand device tree\n\r", size);
+        rc = fdt_open_into(fdt, buf, size);
+        if (rc != 0)
+                fatal("Couldn't expand fdt into new buffer: %s\n\r",
+                      fdt_strerror(rc));
+
+        fdt = buf;
+}
+
+static void *fdt_wrapper_finddevice(const char *path)
+{
+        return offset_devp(fdt_path_offset(fdt, path));
+}
+
+static int fdt_wrapper_getprop(const void *devp, const char *name,
+                               void *buf, const int buflen)
+{
+        const void *p;
+        int len;
+
+        p = fdt_getprop(fdt, devp_offset(devp), name, &len);
+        if (!p)
+                return check_err(len);
+        memcpy(buf, p, min(len, buflen));
+        return len;
+}
+
+static int fdt_wrapper_setprop(const void *devp, const char *name,
+                               const void *buf, const int len)
+{
+        int rc;
+
+        rc = fdt_setprop(fdt, devp_offset(devp), name, buf, len);
+        if (rc == -FDT_ERR_NOSPACE) {
+                expand_buf(len + 16);
+                rc = fdt_setprop(fdt, devp_offset(devp), name, buf, len);
+        }
+
+        return check_err(rc);
+}
+
+static void *fdt_wrapper_get_parent(const void *devp)
+{
+        return offset_devp(fdt_parent_offset(fdt, devp_offset(devp)));
+}
+
+static void *fdt_wrapper_create_node(const void *devp, const char *name)
+{
+        int offset;
+
+        offset = fdt_add_subnode(fdt, devp_offset(devp), name);
+        if (offset == -FDT_ERR_NOSPACE) {
+                expand_buf(strlen(name) + 16);
+                offset = fdt_add_subnode(fdt, devp_offset(devp), name);
+        }
+
+        return offset_devp(offset);
+}
+
+static void *fdt_wrapper_find_node_by_prop_value(const void *prev,
+                                                 const char *name,
+                                                 const char *val,
+                                                 int len)
+{
+        return offset_devp(fdt_node_offset_by_prop_value(fdt, devp_offset(prev),
+                                                         name, val, len));
+}
+
+static char *fdt_wrapper_get_path(const void *devp, char *buf, int len)
+{
+        int rc;
+
+        rc = fdt_get_path(fdt, devp_offset(devp), buf, len);
+        if (check_err(rc))
+                return NULL;
+        return buf;
+}
+
+static unsigned long fdt_wrapper_finalize(void)
+{
+        int rc;
+
+        rc = fdt_pack(fdt);
+        if (rc != 0)
+                fatal("Couldn't pack flat tree: %s\n\r",
+                      fdt_strerror(rc));
+        return (unsigned long)fdt;
+}
+
+void fdt_init(void *blob)
+{
+        int err;
+
+        dt_ops.finddevice = fdt_wrapper_finddevice;
+        dt_ops.getprop = fdt_wrapper_getprop;
+        dt_ops.setprop = fdt_wrapper_setprop;
+        dt_ops.get_parent = fdt_wrapper_get_parent;
+        dt_ops.create_node = fdt_wrapper_create_node;
+        dt_ops.find_node_by_prop_value = fdt_wrapper_find_node_by_prop_value;
+        dt_ops.get_path = fdt_wrapper_get_path;
+        dt_ops.finalize = fdt_wrapper_finalize;
+
+        /* Make sure the dt blob is the right version and so forth */
+        fdt = blob;
+        err = fdt_open_into(fdt, fdt, fdt_totalsize(blob));
+        if (err == -FDT_ERR_NOSPACE) {
+                int bufsize = fdt_totalsize(fdt) + 4;
+                buf = malloc(bufsize);
+                err = fdt_open_into(fdt, buf, bufsize);
+        }
+
+        if (err != 0)
+                fatal("fdt_init(): %s\n\r", fdt_strerror(err));
+
+        if (buf)
+                fdt = buf;
+}