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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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.
*/
#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", __func__, __LINE__, \
fdt_strerror(err)); \
if (BAD_ERROR(err)) \
exit(); \
(err < 0) ? -1 : 0; \
})
#define offset_devp(off) \
({ \
unsigned long _offset = (off); \
check_err(_offset) ? NULL : (void *)(_offset+1); \
})
#define devp_offset_find(devp) (((unsigned long)(devp))-1)
#define devp_offset(devp) (devp ? ((unsigned long)(devp))-1 : 0)
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 int fdt_wrapper_del_node(const void *devp)
{
return fdt_del_node(fdt, devp_offset(devp));
}
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)
{
int offset = fdt_node_offset_by_prop_value(fdt, devp_offset_find(prev),
name, val, len);
return offset_devp(offset);
}
static void *fdt_wrapper_find_node_by_compatible(const void *prev,
const char *val)
{
int offset = fdt_node_offset_by_compatible(fdt, devp_offset_find(prev),
val);
return offset_devp(offset);
}
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;
int bufsize;
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.find_node_by_compatible = fdt_wrapper_find_node_by_compatible;
dt_ops.del_node = fdt_wrapper_del_node;
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;
bufsize = fdt_totalsize(fdt) + EXPAND_GRANULARITY;
buf = malloc(bufsize);
if(!buf)
fatal("malloc failed. can't relocate the device tree\n\r");
err = fdt_open_into(fdt, buf, bufsize);
if (err != 0)
fatal("fdt_init(): %s\n\r", fdt_strerror(err));
fdt = buf;
}
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