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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
336 lines
7.8 KiB
C
336 lines
7.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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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#include <common.h>
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#include <linux/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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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 (!mem)
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return NULL;
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}
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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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if (!size)
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return -EFAULT;
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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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