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/* 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;
}
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