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![Thierry Reding](/assets/img/avatar_default.png)
The new fdt_generate_phandle() function can be used to generate a new, unused phandle given a specific device tree blob. The implementation is somewhat naive in that it simply walks the entire device tree to find the highest phandle value and then returns a phandle value one higher than that. A more clever implementation might try to find holes in the current set of phandle values and fill them. But this implementation is relatively simple and works reliably. Also add a test that validates that phandles generated by this new API are indeed unique. Signed-off-by: Thierry Reding <treding@nvidia.com> Reviewed-by: Simon Glass <sjg@chromium.org>
714 lines
15 KiB
C
714 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0+ OR BSD-2-Clause
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/*
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* libfdt - Flat Device Tree manipulation
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* Copyright (C) 2006 David Gibson, IBM Corporation.
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*/
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#include <linux/libfdt_env.h>
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#ifndef USE_HOSTCC
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#include <fdt.h>
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#include <linux/libfdt.h>
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#else
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#include "fdt_host.h"
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#endif
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#include "libfdt_internal.h"
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static int _fdt_nodename_eq(const void *fdt, int offset,
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const char *s, int len)
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{
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const char *p = fdt_offset_ptr(fdt, offset + FDT_TAGSIZE, len+1);
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if (!p)
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/* short match */
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return 0;
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if (memcmp(p, s, len) != 0)
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return 0;
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if (p[len] == '\0')
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return 1;
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else if (!memchr(s, '@', len) && (p[len] == '@'))
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return 1;
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else
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return 0;
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}
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const char *fdt_string(const void *fdt, int stroffset)
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{
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return (const char *)fdt + fdt_off_dt_strings(fdt) + stroffset;
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}
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static int _fdt_string_eq(const void *fdt, int stroffset,
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const char *s, int len)
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{
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const char *p = fdt_string(fdt, stroffset);
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return (strnlen(p, len + 1) == len) && (memcmp(p, s, len) == 0);
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}
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uint32_t fdt_get_max_phandle(const void *fdt)
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{
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uint32_t max_phandle = 0;
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int offset;
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for (offset = fdt_next_node(fdt, -1, NULL);;
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offset = fdt_next_node(fdt, offset, NULL)) {
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uint32_t phandle;
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if (offset == -FDT_ERR_NOTFOUND)
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return max_phandle;
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if (offset < 0)
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return (uint32_t)-1;
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phandle = fdt_get_phandle(fdt, offset);
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if (phandle == (uint32_t)-1)
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continue;
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if (phandle > max_phandle)
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max_phandle = phandle;
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}
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return 0;
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}
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int fdt_generate_phandle(const void *fdt, uint32_t *phandle)
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{
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uint32_t max = 0;
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int offset = -1;
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while (true) {
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uint32_t value;
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offset = fdt_next_node(fdt, offset, NULL);
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if (offset < 0) {
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if (offset == -FDT_ERR_NOTFOUND)
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break;
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return offset;
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}
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value = fdt_get_phandle(fdt, offset);
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if (value > max)
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max = value;
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}
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if (max == FDT_MAX_PHANDLE)
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return -FDT_ERR_NOPHANDLES;
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if (phandle)
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*phandle = max + 1;
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return 0;
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}
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int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size)
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{
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FDT_CHECK_HEADER(fdt);
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*address = fdt64_to_cpu(fdt_mem_rsv_(fdt, n)->address);
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*size = fdt64_to_cpu(fdt_mem_rsv_(fdt, n)->size);
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return 0;
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}
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int fdt_num_mem_rsv(const void *fdt)
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{
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int i = 0;
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while (fdt64_to_cpu(fdt_mem_rsv_(fdt, i)->size) != 0)
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i++;
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return i;
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}
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static int _nextprop(const void *fdt, int offset)
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{
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uint32_t tag;
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int nextoffset;
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do {
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tag = fdt_next_tag(fdt, offset, &nextoffset);
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switch (tag) {
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case FDT_END:
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if (nextoffset >= 0)
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return -FDT_ERR_BADSTRUCTURE;
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else
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return nextoffset;
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case FDT_PROP:
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return offset;
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}
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offset = nextoffset;
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} while (tag == FDT_NOP);
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return -FDT_ERR_NOTFOUND;
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}
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int fdt_subnode_offset_namelen(const void *fdt, int offset,
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const char *name, int namelen)
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{
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int depth;
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FDT_CHECK_HEADER(fdt);
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for (depth = 0;
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(offset >= 0) && (depth >= 0);
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offset = fdt_next_node(fdt, offset, &depth))
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if ((depth == 1)
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&& _fdt_nodename_eq(fdt, offset, name, namelen))
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return offset;
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if (depth < 0)
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return -FDT_ERR_NOTFOUND;
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return offset; /* error */
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}
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int fdt_subnode_offset(const void *fdt, int parentoffset,
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const char *name)
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{
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return fdt_subnode_offset_namelen(fdt, parentoffset, name, strlen(name));
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}
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/*
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* Find the next of path separator, note we need to search for both '/' and ':'
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* and then take the first one so that we do the right thing for e.g.
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* "foo/bar:option" and "bar:option/otheroption", both of which happen, so
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* first searching for either ':' or '/' does not work.
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*/
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static const char *fdt_path_next_separator(const char *path, int len)
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{
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const void *sep1 = memchr(path, '/', len);
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const void *sep2 = memchr(path, ':', len);
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if (sep1 && sep2)
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return (sep1 < sep2) ? sep1 : sep2;
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else if (sep1)
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return sep1;
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else
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return sep2;
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}
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int fdt_path_offset_namelen(const void *fdt, const char *path, int namelen)
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{
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const char *end = path + namelen;
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const char *p = path;
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int offset = 0;
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FDT_CHECK_HEADER(fdt);
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/* see if we have an alias */
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if (*path != '/') {
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const char *q = fdt_path_next_separator(path, namelen);
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if (!q)
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q = end;
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p = fdt_get_alias_namelen(fdt, p, q - p);
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if (!p)
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return -FDT_ERR_BADPATH;
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offset = fdt_path_offset(fdt, p);
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p = q;
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}
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while (*p && (p < end)) {
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const char *q;
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while (*p == '/')
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p++;
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if (*p == '\0' || *p == ':')
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return offset;
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q = fdt_path_next_separator(p, end - p);
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if (!q)
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q = end;
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offset = fdt_subnode_offset_namelen(fdt, offset, p, q-p);
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if (offset < 0)
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return offset;
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p = q;
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}
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return offset;
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}
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int fdt_path_offset(const void *fdt, const char *path)
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{
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return fdt_path_offset_namelen(fdt, path, strlen(path));
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}
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const char *fdt_get_name(const void *fdt, int nodeoffset, int *len)
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{
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const struct fdt_node_header *nh = fdt_offset_ptr_(fdt, nodeoffset);
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int err;
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if (((err = fdt_check_header(fdt)) != 0)
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|| ((err = fdt_check_node_offset_(fdt, nodeoffset)) < 0))
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goto fail;
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if (len)
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*len = strlen(nh->name);
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return nh->name;
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fail:
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if (len)
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*len = err;
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return NULL;
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}
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int fdt_first_property_offset(const void *fdt, int nodeoffset)
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{
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int offset;
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if ((offset = fdt_check_node_offset_(fdt, nodeoffset)) < 0)
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return offset;
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return _nextprop(fdt, offset);
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}
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int fdt_next_property_offset(const void *fdt, int offset)
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{
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if ((offset = fdt_check_prop_offset_(fdt, offset)) < 0)
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return offset;
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return _nextprop(fdt, offset);
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}
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const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
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int offset,
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int *lenp)
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{
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int err;
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const struct fdt_property *prop;
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if ((err = fdt_check_prop_offset_(fdt, offset)) < 0) {
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if (lenp)
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*lenp = err;
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return NULL;
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}
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prop = fdt_offset_ptr_(fdt, offset);
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if (lenp)
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*lenp = fdt32_to_cpu(prop->len);
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return prop;
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}
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const struct fdt_property *fdt_get_property_namelen(const void *fdt,
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int offset,
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const char *name,
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int namelen, int *lenp)
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{
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for (offset = fdt_first_property_offset(fdt, offset);
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(offset >= 0);
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(offset = fdt_next_property_offset(fdt, offset))) {
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const struct fdt_property *prop;
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if (!(prop = fdt_get_property_by_offset(fdt, offset, lenp))) {
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offset = -FDT_ERR_INTERNAL;
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break;
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}
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if (_fdt_string_eq(fdt, fdt32_to_cpu(prop->nameoff),
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name, namelen))
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return prop;
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}
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if (lenp)
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*lenp = offset;
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return NULL;
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}
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const struct fdt_property *fdt_get_property(const void *fdt,
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int nodeoffset,
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const char *name, int *lenp)
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{
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return fdt_get_property_namelen(fdt, nodeoffset, name,
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strlen(name), lenp);
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}
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const void *fdt_getprop_namelen(const void *fdt, int nodeoffset,
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const char *name, int namelen, int *lenp)
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{
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const struct fdt_property *prop;
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prop = fdt_get_property_namelen(fdt, nodeoffset, name, namelen, lenp);
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if (!prop)
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return NULL;
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return prop->data;
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}
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const void *fdt_getprop_by_offset(const void *fdt, int offset,
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const char **namep, int *lenp)
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{
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const struct fdt_property *prop;
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prop = fdt_get_property_by_offset(fdt, offset, lenp);
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if (!prop)
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return NULL;
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if (namep)
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*namep = fdt_string(fdt, fdt32_to_cpu(prop->nameoff));
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return prop->data;
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}
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const void *fdt_getprop(const void *fdt, int nodeoffset,
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const char *name, int *lenp)
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{
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return fdt_getprop_namelen(fdt, nodeoffset, name, strlen(name), lenp);
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}
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uint32_t fdt_get_phandle(const void *fdt, int nodeoffset)
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{
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const fdt32_t *php;
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int len;
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/* FIXME: This is a bit sub-optimal, since we potentially scan
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* over all the properties twice. */
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php = fdt_getprop(fdt, nodeoffset, "phandle", &len);
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if (!php || (len != sizeof(*php))) {
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php = fdt_getprop(fdt, nodeoffset, "linux,phandle", &len);
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if (!php || (len != sizeof(*php)))
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return 0;
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}
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return fdt32_to_cpu(*php);
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}
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const char *fdt_get_alias_namelen(const void *fdt,
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const char *name, int namelen)
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{
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int aliasoffset;
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aliasoffset = fdt_path_offset(fdt, "/aliases");
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if (aliasoffset < 0)
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return NULL;
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return fdt_getprop_namelen(fdt, aliasoffset, name, namelen, NULL);
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}
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const char *fdt_get_alias(const void *fdt, const char *name)
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{
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return fdt_get_alias_namelen(fdt, name, strlen(name));
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}
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int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen)
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{
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int pdepth = 0, p = 0;
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int offset, depth, namelen;
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const char *name;
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FDT_CHECK_HEADER(fdt);
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if (buflen < 2)
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return -FDT_ERR_NOSPACE;
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for (offset = 0, depth = 0;
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(offset >= 0) && (offset <= nodeoffset);
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offset = fdt_next_node(fdt, offset, &depth)) {
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while (pdepth > depth) {
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do {
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p--;
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} while (buf[p-1] != '/');
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pdepth--;
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}
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if (pdepth >= depth) {
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name = fdt_get_name(fdt, offset, &namelen);
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if (!name)
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return namelen;
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if ((p + namelen + 1) <= buflen) {
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memcpy(buf + p, name, namelen);
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p += namelen;
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buf[p++] = '/';
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pdepth++;
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}
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}
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if (offset == nodeoffset) {
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if (pdepth < (depth + 1))
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return -FDT_ERR_NOSPACE;
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if (p > 1) /* special case so that root path is "/", not "" */
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p--;
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buf[p] = '\0';
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return 0;
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}
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}
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if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
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return -FDT_ERR_BADOFFSET;
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else if (offset == -FDT_ERR_BADOFFSET)
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return -FDT_ERR_BADSTRUCTURE;
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return offset; /* error from fdt_next_node() */
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}
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int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
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int supernodedepth, int *nodedepth)
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{
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int offset, depth;
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int supernodeoffset = -FDT_ERR_INTERNAL;
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FDT_CHECK_HEADER(fdt);
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if (supernodedepth < 0)
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return -FDT_ERR_NOTFOUND;
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for (offset = 0, depth = 0;
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(offset >= 0) && (offset <= nodeoffset);
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offset = fdt_next_node(fdt, offset, &depth)) {
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if (depth == supernodedepth)
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supernodeoffset = offset;
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if (offset == nodeoffset) {
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if (nodedepth)
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*nodedepth = depth;
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if (supernodedepth > depth)
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return -FDT_ERR_NOTFOUND;
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else
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return supernodeoffset;
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}
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}
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if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
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return -FDT_ERR_BADOFFSET;
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else if (offset == -FDT_ERR_BADOFFSET)
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return -FDT_ERR_BADSTRUCTURE;
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return offset; /* error from fdt_next_node() */
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}
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int fdt_node_depth(const void *fdt, int nodeoffset)
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{
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int nodedepth;
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int err;
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err = fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, &nodedepth);
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if (err)
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return (err < 0) ? err : -FDT_ERR_INTERNAL;
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return nodedepth;
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}
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int fdt_parent_offset(const void *fdt, int nodeoffset)
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{
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int nodedepth = fdt_node_depth(fdt, nodeoffset);
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if (nodedepth < 0)
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return nodedepth;
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return fdt_supernode_atdepth_offset(fdt, nodeoffset,
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nodedepth - 1, NULL);
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}
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int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
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const char *propname,
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const void *propval, int proplen)
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{
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int offset;
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const void *val;
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int len;
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FDT_CHECK_HEADER(fdt);
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/* FIXME: The algorithm here is pretty horrible: we scan each
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* property of a node in fdt_getprop(), then if that didn't
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* find what we want, we scan over them again making our way
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* to the next node. Still it's the easiest to implement
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* approach; performance can come later. */
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for (offset = fdt_next_node(fdt, startoffset, NULL);
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offset >= 0;
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offset = fdt_next_node(fdt, offset, NULL)) {
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val = fdt_getprop(fdt, offset, propname, &len);
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if (val && (len == proplen)
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&& (memcmp(val, propval, len) == 0))
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return offset;
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}
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return offset; /* error from fdt_next_node() */
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}
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int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle)
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{
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int offset;
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if ((phandle == 0) || (phandle == -1))
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return -FDT_ERR_BADPHANDLE;
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FDT_CHECK_HEADER(fdt);
|
|
|
|
/* FIXME: The algorithm here is pretty horrible: we
|
|
* potentially scan each property of a node in
|
|
* fdt_get_phandle(), then if that didn't find what
|
|
* we want, we scan over them again making our way to the next
|
|
* node. Still it's the easiest to implement approach;
|
|
* performance can come later. */
|
|
for (offset = fdt_next_node(fdt, -1, NULL);
|
|
offset >= 0;
|
|
offset = fdt_next_node(fdt, offset, NULL)) {
|
|
if (fdt_get_phandle(fdt, offset) == phandle)
|
|
return offset;
|
|
}
|
|
|
|
return offset; /* error from fdt_next_node() */
|
|
}
|
|
|
|
int fdt_stringlist_contains(const char *strlist, int listlen, const char *str)
|
|
{
|
|
int len = strlen(str);
|
|
const char *p;
|
|
|
|
while (listlen >= len) {
|
|
if (memcmp(str, strlist, len+1) == 0)
|
|
return 1;
|
|
p = memchr(strlist, '\0', listlen);
|
|
if (!p)
|
|
return 0; /* malformed strlist.. */
|
|
listlen -= (p-strlist) + 1;
|
|
strlist = p + 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int fdt_stringlist_count(const void *fdt, int nodeoffset, const char *property)
|
|
{
|
|
const char *list, *end;
|
|
int length, count = 0;
|
|
|
|
list = fdt_getprop(fdt, nodeoffset, property, &length);
|
|
if (!list)
|
|
return length;
|
|
|
|
end = list + length;
|
|
|
|
while (list < end) {
|
|
length = strnlen(list, end - list) + 1;
|
|
|
|
/* Abort if the last string isn't properly NUL-terminated. */
|
|
if (list + length > end)
|
|
return -FDT_ERR_BADVALUE;
|
|
|
|
list += length;
|
|
count++;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
int fdt_stringlist_search(const void *fdt, int nodeoffset, const char *property,
|
|
const char *string)
|
|
{
|
|
int length, len, idx = 0;
|
|
const char *list, *end;
|
|
|
|
list = fdt_getprop(fdt, nodeoffset, property, &length);
|
|
if (!list)
|
|
return length;
|
|
|
|
len = strlen(string) + 1;
|
|
end = list + length;
|
|
|
|
while (list < end) {
|
|
length = strnlen(list, end - list) + 1;
|
|
|
|
/* Abort if the last string isn't properly NUL-terminated. */
|
|
if (list + length > end)
|
|
return -FDT_ERR_BADVALUE;
|
|
|
|
if (length == len && memcmp(list, string, length) == 0)
|
|
return idx;
|
|
|
|
list += length;
|
|
idx++;
|
|
}
|
|
|
|
return -FDT_ERR_NOTFOUND;
|
|
}
|
|
|
|
const char *fdt_stringlist_get(const void *fdt, int nodeoffset,
|
|
const char *property, int idx,
|
|
int *lenp)
|
|
{
|
|
const char *list, *end;
|
|
int length;
|
|
|
|
list = fdt_getprop(fdt, nodeoffset, property, &length);
|
|
if (!list) {
|
|
if (lenp)
|
|
*lenp = length;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
end = list + length;
|
|
|
|
while (list < end) {
|
|
length = strnlen(list, end - list) + 1;
|
|
|
|
/* Abort if the last string isn't properly NUL-terminated. */
|
|
if (list + length > end) {
|
|
if (lenp)
|
|
*lenp = -FDT_ERR_BADVALUE;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
if (idx == 0) {
|
|
if (lenp)
|
|
*lenp = length - 1;
|
|
|
|
return list;
|
|
}
|
|
|
|
list += length;
|
|
idx--;
|
|
}
|
|
|
|
if (lenp)
|
|
*lenp = -FDT_ERR_NOTFOUND;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int fdt_node_check_compatible(const void *fdt, int nodeoffset,
|
|
const char *compatible)
|
|
{
|
|
const void *prop;
|
|
int len;
|
|
|
|
prop = fdt_getprop(fdt, nodeoffset, "compatible", &len);
|
|
if (!prop)
|
|
return len;
|
|
|
|
return !fdt_stringlist_contains(prop, len, compatible);
|
|
}
|
|
|
|
int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
|
|
const char *compatible)
|
|
{
|
|
int offset, err;
|
|
|
|
FDT_CHECK_HEADER(fdt);
|
|
|
|
/* FIXME: The algorithm here is pretty horrible: we scan each
|
|
* property of a node in fdt_node_check_compatible(), then if
|
|
* that didn't find what we want, we scan over them again
|
|
* making our way to the next node. Still it's the easiest to
|
|
* implement approach; performance can come later. */
|
|
for (offset = fdt_next_node(fdt, startoffset, NULL);
|
|
offset >= 0;
|
|
offset = fdt_next_node(fdt, offset, NULL)) {
|
|
err = fdt_node_check_compatible(fdt, offset, compatible);
|
|
if ((err < 0) && (err != -FDT_ERR_NOTFOUND))
|
|
return err;
|
|
else if (err == 0)
|
|
return offset;
|
|
}
|
|
|
|
return offset; /* error from fdt_next_node() */
|
|
}
|