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https://github.com/AsahiLinux/u-boot
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dm: Add a function to create a 'live' device tree
This function converts the flat device tree into a hierarchical one with C structures and pointers. This is easier to access. Signed-off-by: Simon Glass <sjg@chromium.org>
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24
include/of_live.h
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24
include/of_live.h
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/*
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* Copyright (c) 2017 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* Support for a 'live' (as opposed to flat) device tree
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*/
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#ifndef _OF_LIVE_H
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#define _OF_LIVE_H
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struct device_node;
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/**
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* of_live_build() - build a live (hierarchical) tree from a flat DT
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*
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* @fdt_blob: Input tree to convert
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* @rootp: Returns live tree that was created
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* @return 0 if OK, -ve on error
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*/
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int of_live_build(const void *fdt_blob, struct device_node **rootp);
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#endif
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@ -15,6 +15,7 @@ obj-$(CONFIG_ZLIB) += zlib/
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obj-$(CONFIG_BZIP2) += bzip2/
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obj-$(CONFIG_TIZEN) += tizen/
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obj-$(CONFIG_FIT) += libfdt/
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obj-$(CONFIG_OF_LIVE) += of_live.o
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obj-$(CONFIG_CMD_DHRYSTONE) += dhry/
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obj-$(CONFIG_AES) += aes.o
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333
lib/of_live.c
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lib/of_live.c
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/*
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* Copyright 2009 Benjamin Herrenschmidt, IBM Corp
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* benh@kernel.crashing.org
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*
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* Based on parts of drivers/of/fdt.c from Linux v4.9
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* Modifications for U-Boot
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* Copyright (c) 2017 Google, Inc
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <libfdt.h>
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#include <of_live.h>
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#include <malloc.h>
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#include <dm/of_access.h>
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#include <linux/err.h>
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DECLARE_GLOBAL_DATA_PTR;
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static void *unflatten_dt_alloc(void **mem, unsigned long size,
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unsigned long align)
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{
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void *res;
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*mem = PTR_ALIGN(*mem, align);
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res = *mem;
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*mem += size;
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return res;
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}
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/**
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* unflatten_dt_node() - Alloc and populate a device_node from the flat tree
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* @blob: The parent device tree blob
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* @mem: Memory chunk to use for allocating device nodes and properties
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* @poffset: pointer to node in flat tree
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* @dad: Parent struct device_node
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* @nodepp: The device_node tree created by the call
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* @fpsize: Size of the node path up at t05he current depth.
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* @dryrun: If true, do not allocate device nodes but still calculate needed
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* memory size
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*/
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static void *unflatten_dt_node(const void *blob, void *mem, int *poffset,
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struct device_node *dad,
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struct device_node **nodepp,
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unsigned long fpsize, bool dryrun)
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{
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const __be32 *p;
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struct device_node *np;
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struct property *pp, **prev_pp = NULL;
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const char *pathp;
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int l;
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unsigned int allocl;
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static int depth;
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int old_depth;
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int offset;
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int has_name = 0;
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int new_format = 0;
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pathp = fdt_get_name(blob, *poffset, &l);
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if (!pathp)
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return mem;
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allocl = ++l;
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/*
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* version 0x10 has a more compact unit name here instead of the full
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* path. we accumulate the full path size using "fpsize", we'll rebuild
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* it later. We detect this because the first character of the name is
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* not '/'.
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*/
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if ((*pathp) != '/') {
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new_format = 1;
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if (fpsize == 0) {
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/*
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* root node: special case. fpsize accounts for path
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* plus terminating zero. root node only has '/', so
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* fpsize should be 2, but we want to avoid the first
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* level nodes to have two '/' so we use fpsize 1 here
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*/
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fpsize = 1;
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allocl = 2;
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l = 1;
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pathp = "";
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} else {
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/*
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* account for '/' and path size minus terminal 0
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* already in 'l'
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*/
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fpsize += l;
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allocl = fpsize;
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}
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}
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np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
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__alignof__(struct device_node));
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if (!dryrun) {
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char *fn;
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fn = (char *)np + sizeof(*np);
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np->full_name = fn;
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if (new_format) {
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/* rebuild full path for new format */
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if (dad && dad->parent) {
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strcpy(fn, dad->full_name);
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#ifdef DEBUG
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if ((strlen(fn) + l + 1) != allocl) {
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debug("%s: p: %d, l: %d, a: %d\n",
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pathp, (int)strlen(fn), l,
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allocl);
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}
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#endif
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fn += strlen(fn);
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}
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*(fn++) = '/';
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}
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memcpy(fn, pathp, l);
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prev_pp = &np->properties;
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if (dad != NULL) {
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np->parent = dad;
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np->sibling = dad->child;
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dad->child = np;
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}
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}
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/* process properties */
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for (offset = fdt_first_property_offset(blob, *poffset);
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(offset >= 0);
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(offset = fdt_next_property_offset(blob, offset))) {
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const char *pname;
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int sz;
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p = fdt_getprop_by_offset(blob, offset, &pname, &sz);
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if (!p) {
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offset = -FDT_ERR_INTERNAL;
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break;
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}
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if (pname == NULL) {
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debug("Can't find property name in list !\n");
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break;
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}
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if (strcmp(pname, "name") == 0)
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has_name = 1;
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pp = unflatten_dt_alloc(&mem, sizeof(struct property),
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__alignof__(struct property));
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if (!dryrun) {
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/*
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* We accept flattened tree phandles either in
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* ePAPR-style "phandle" properties, or the
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* legacy "linux,phandle" properties. If both
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* appear and have different values, things
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* will get weird. Don't do that. */
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if ((strcmp(pname, "phandle") == 0) ||
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(strcmp(pname, "linux,phandle") == 0)) {
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if (np->phandle == 0)
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np->phandle = be32_to_cpup(p);
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}
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/*
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* And we process the "ibm,phandle" property
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* used in pSeries dynamic device tree
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* stuff */
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if (strcmp(pname, "ibm,phandle") == 0)
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np->phandle = be32_to_cpup(p);
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pp->name = (char *)pname;
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pp->length = sz;
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pp->value = (__be32 *)p;
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*prev_pp = pp;
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prev_pp = &pp->next;
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}
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}
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/*
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* with version 0x10 we may not have the name property, recreate
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* it here from the unit name if absent
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*/
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if (!has_name) {
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const char *p1 = pathp, *ps = pathp, *pa = NULL;
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int sz;
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while (*p1) {
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if ((*p1) == '@')
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pa = p1;
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if ((*p1) == '/')
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ps = p1 + 1;
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p1++;
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}
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if (pa < ps)
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pa = p1;
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sz = (pa - ps) + 1;
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pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
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__alignof__(struct property));
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if (!dryrun) {
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pp->name = "name";
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pp->length = sz;
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pp->value = pp + 1;
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*prev_pp = pp;
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prev_pp = &pp->next;
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memcpy(pp->value, ps, sz - 1);
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((char *)pp->value)[sz - 1] = 0;
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debug("fixed up name for %s -> %s\n", pathp,
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(char *)pp->value);
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}
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}
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if (!dryrun) {
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*prev_pp = NULL;
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np->name = of_get_property(np, "name", NULL);
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np->type = of_get_property(np, "device_type", NULL);
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if (!np->name)
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np->name = "<NULL>";
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if (!np->type)
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np->type = "<NULL>"; }
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old_depth = depth;
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*poffset = fdt_next_node(blob, *poffset, &depth);
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if (depth < 0)
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depth = 0;
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while (*poffset > 0 && depth > old_depth)
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mem = unflatten_dt_node(blob, mem, poffset, np, NULL,
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fpsize, dryrun);
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if (*poffset < 0 && *poffset != -FDT_ERR_NOTFOUND) {
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debug("unflatten: error %d processing FDT\n", *poffset);
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return NULL;
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}
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/*
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* Reverse the child list. Some drivers assumes node order matches .dts
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* node order
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*/
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if (!dryrun && np->child) {
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struct device_node *child = np->child;
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np->child = NULL;
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while (child) {
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struct device_node *next = child->sibling;
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child->sibling = np->child;
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np->child = child;
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child = next;
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}
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}
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if (nodepp)
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*nodepp = np;
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return mem;
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}
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/**
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* unflatten_device_tree() - create tree of device_nodes from flat blob
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*
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* unflattens a device-tree, creating the
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* tree of struct device_node. It also fills the "name" and "type"
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* pointers of the nodes so the normal device-tree walking functions
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* can be used.
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* @blob: The blob to expand
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* @mynodes: The device_node tree created by the call
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* @return 0 if OK, -ve on error
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*/
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static int unflatten_device_tree(const void *blob,
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struct device_node **mynodes)
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{
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unsigned long size;
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int start;
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void *mem;
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debug(" -> unflatten_device_tree()\n");
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if (!blob) {
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debug("No device tree pointer\n");
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return -EINVAL;
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}
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debug("Unflattening device tree:\n");
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debug("magic: %08x\n", fdt_magic(blob));
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debug("size: %08x\n", fdt_totalsize(blob));
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debug("version: %08x\n", fdt_version(blob));
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if (fdt_check_header(blob)) {
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debug("Invalid device tree blob header\n");
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return -EINVAL;
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}
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/* First pass, scan for size */
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start = 0;
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size = (unsigned long)unflatten_dt_node(blob, NULL, &start, NULL, NULL,
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0, true);
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size = ALIGN(size, 4);
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debug(" size is %lx, allocating...\n", size);
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/* Allocate memory for the expanded device tree */
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mem = malloc(size + 4);
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memset(mem, '\0', size);
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*(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef);
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debug(" unflattening %p...\n", mem);
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/* Second pass, do actual unflattening */
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start = 0;
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unflatten_dt_node(blob, mem, &start, NULL, mynodes, 0, false);
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if (be32_to_cpup(mem + size) != 0xdeadbeef) {
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debug("End of tree marker overwritten: %08x\n",
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be32_to_cpup(mem + size));
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return -ENOSPC;
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}
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debug(" <- unflatten_device_tree()\n");
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return 0;
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}
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int of_live_build(const void *fdt_blob, struct device_node **rootp)
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{
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int ret;
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debug("%s: start\n", __func__);
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ret = unflatten_device_tree(fdt_blob, rootp);
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if (ret) {
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debug("Failed to create live tree: err=%d\n", ret);
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return ret;
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}
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ret = of_alias_scan();
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if (ret) {
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debug("Failed to scan live tree aliases: err=%d\n", ret);
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return ret;
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}
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debug("%s: stop\n", __func__);
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return ret;
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}
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