![Grant Likely](/assets/img/avatar_default.png)
This patch adds of_flat_dt_match() which tests a node for compatibility with a list of values and converts the relevant powerpc platform code to use it. This approach simplifies the board support code a bit. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Reviewed-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
721 lines
18 KiB
C
721 lines
18 KiB
C
/*
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* Functions for working with the Flattened Device Tree data format
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/initrd.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#ifdef CONFIG_PPC
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#include <asm/machdep.h>
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#endif /* CONFIG_PPC */
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#include <asm/page.h>
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char *of_fdt_get_string(struct boot_param_header *blob, u32 offset)
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{
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return ((char *)blob) +
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be32_to_cpu(blob->off_dt_strings) + offset;
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}
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/**
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* of_fdt_get_property - Given a node in the given flat blob, return
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* the property ptr
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*/
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void *of_fdt_get_property(struct boot_param_header *blob,
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unsigned long node, const char *name,
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unsigned long *size)
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{
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unsigned long p = node;
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do {
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u32 tag = be32_to_cpup((__be32 *)p);
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u32 sz, noff;
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const char *nstr;
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p += 4;
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if (tag == OF_DT_NOP)
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continue;
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if (tag != OF_DT_PROP)
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return NULL;
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sz = be32_to_cpup((__be32 *)p);
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noff = be32_to_cpup((__be32 *)(p + 4));
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p += 8;
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if (be32_to_cpu(blob->version) < 0x10)
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p = ALIGN(p, sz >= 8 ? 8 : 4);
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nstr = of_fdt_get_string(blob, noff);
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if (nstr == NULL) {
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pr_warning("Can't find property index name !\n");
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return NULL;
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}
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if (strcmp(name, nstr) == 0) {
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if (size)
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*size = sz;
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return (void *)p;
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}
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p += sz;
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p = ALIGN(p, 4);
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} while (1);
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}
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/**
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* of_fdt_is_compatible - Return true if given node from the given blob has
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* compat in its compatible list
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* @blob: A device tree blob
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* @node: node to test
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* @compat: compatible string to compare with compatible list.
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*
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* On match, returns a non-zero value with smaller values returned for more
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* specific compatible values.
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*/
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int of_fdt_is_compatible(struct boot_param_header *blob,
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unsigned long node, const char *compat)
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{
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const char *cp;
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unsigned long cplen, l, score = 0;
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cp = of_fdt_get_property(blob, node, "compatible", &cplen);
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if (cp == NULL)
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return 0;
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while (cplen > 0) {
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score++;
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if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
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return score;
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l = strlen(cp) + 1;
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cp += l;
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cplen -= l;
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}
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return 0;
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}
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/**
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* of_fdt_match - Return true if node matches a list of compatible values
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*/
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int of_fdt_match(struct boot_param_header *blob, unsigned long node,
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const char **compat)
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{
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unsigned int tmp, score = 0;
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if (!compat)
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return 0;
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while (*compat) {
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tmp = of_fdt_is_compatible(blob, node, *compat);
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if (tmp && (score == 0 || (tmp < score)))
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score = tmp;
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compat++;
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}
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return score;
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}
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static void *unflatten_dt_alloc(unsigned long *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 = ALIGN(*mem, align);
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res = (void *)*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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* @p: pointer to node in flat tree
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* @dad: Parent struct device_node
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* @allnextpp: pointer to ->allnext from last allocated device_node
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* @fpsize: Size of the node path up at the current depth.
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*/
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unsigned long unflatten_dt_node(struct boot_param_header *blob,
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unsigned long mem,
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unsigned long *p,
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struct device_node *dad,
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struct device_node ***allnextpp,
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unsigned long fpsize)
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{
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struct device_node *np;
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struct property *pp, **prev_pp = NULL;
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char *pathp;
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u32 tag;
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unsigned int l, allocl;
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int has_name = 0;
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int new_format = 0;
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tag = be32_to_cpup((__be32 *)(*p));
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if (tag != OF_DT_BEGIN_NODE) {
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pr_err("Weird tag at start of node: %x\n", tag);
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return mem;
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}
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*p += 4;
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pathp = (char *)*p;
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l = allocl = strlen(pathp) + 1;
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*p = ALIGN(*p + l, 4);
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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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/* 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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} else {
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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 (allnextpp) {
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memset(np, 0, sizeof(*np));
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np->full_name = ((char *)np) + sizeof(struct device_node);
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if (new_format) {
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char *fn = np->full_name;
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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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pr_debug("%s: p: %d, l: %d, a: %d\n",
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pathp, (int)strlen(fn),
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l, 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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memcpy(fn, pathp, l);
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} else
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memcpy(np->full_name, pathp, l);
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prev_pp = &np->properties;
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**allnextpp = np;
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*allnextpp = &np->allnext;
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if (dad != NULL) {
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np->parent = dad;
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/* we temporarily use the next field as `last_child'*/
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if (dad->next == NULL)
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dad->child = np;
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else
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dad->next->sibling = np;
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dad->next = np;
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}
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kref_init(&np->kref);
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}
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while (1) {
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u32 sz, noff;
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char *pname;
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tag = be32_to_cpup((__be32 *)(*p));
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if (tag == OF_DT_NOP) {
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*p += 4;
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continue;
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}
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if (tag != OF_DT_PROP)
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break;
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*p += 4;
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sz = be32_to_cpup((__be32 *)(*p));
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noff = be32_to_cpup((__be32 *)((*p) + 4));
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*p += 8;
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if (be32_to_cpu(blob->version) < 0x10)
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*p = ALIGN(*p, sz >= 8 ? 8 : 4);
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pname = of_fdt_get_string(blob, noff);
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if (pname == NULL) {
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pr_info("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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l = strlen(pname) + 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 (allnextpp) {
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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((__be32*)*p);
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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((__be32 *)*p);
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pp->name = pname;
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pp->length = sz;
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pp->value = (void *)*p;
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*prev_pp = pp;
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prev_pp = &pp->next;
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}
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*p = ALIGN((*p) + sz, 4);
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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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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 (allnextpp) {
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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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pr_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 (allnextpp) {
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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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}
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while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) {
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if (tag == OF_DT_NOP)
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*p += 4;
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else
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mem = unflatten_dt_node(blob, mem, p, np, allnextpp,
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fpsize);
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tag = be32_to_cpup((__be32 *)(*p));
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}
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if (tag != OF_DT_END_NODE) {
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pr_err("Weird tag at end of node: %x\n", tag);
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return mem;
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}
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*p += 4;
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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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* @dt_alloc: An allocator that provides a virtual address to memory
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* for the resulting tree
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*/
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void __unflatten_device_tree(struct boot_param_header *blob,
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struct device_node **mynodes,
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void * (*dt_alloc)(u64 size, u64 align))
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{
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unsigned long start, mem, size;
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struct device_node **allnextp = mynodes;
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pr_debug(" -> unflatten_device_tree()\n");
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if (!blob) {
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pr_debug("No device tree pointer\n");
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return;
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}
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pr_debug("Unflattening device tree:\n");
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pr_debug("magic: %08x\n", be32_to_cpu(blob->magic));
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pr_debug("size: %08x\n", be32_to_cpu(blob->totalsize));
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pr_debug("version: %08x\n", be32_to_cpu(blob->version));
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if (be32_to_cpu(blob->magic) != OF_DT_HEADER) {
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pr_err("Invalid device tree blob header\n");
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return;
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}
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/* First pass, scan for size */
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start = ((unsigned long)blob) +
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be32_to_cpu(blob->off_dt_struct);
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size = unflatten_dt_node(blob, 0, &start, NULL, NULL, 0);
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size = (size | 3) + 1;
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pr_debug(" size is %lx, allocating...\n", size);
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/* Allocate memory for the expanded device tree */
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mem = (unsigned long)
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dt_alloc(size + 4, __alignof__(struct device_node));
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((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef);
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pr_debug(" unflattening %lx...\n", mem);
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/* Second pass, do actual unflattening */
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start = ((unsigned long)blob) +
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be32_to_cpu(blob->off_dt_struct);
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unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0);
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if (be32_to_cpup((__be32 *)start) != OF_DT_END)
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pr_warning("Weird tag at end of tree: %08x\n", *((u32 *)start));
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if (be32_to_cpu(((__be32 *)mem)[size / 4]) != 0xdeadbeef)
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pr_warning("End of tree marker overwritten: %08x\n",
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be32_to_cpu(((__be32 *)mem)[size / 4]));
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*allnextp = NULL;
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pr_debug(" <- unflatten_device_tree()\n");
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}
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static void *kernel_tree_alloc(u64 size, u64 align)
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{
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return kzalloc(size, GFP_KERNEL);
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}
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/**
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* of_fdt_unflatten_tree - create tree of device_nodes from flat blob
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*
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* unflattens the device-tree passed by the firmware, 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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*/
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void of_fdt_unflatten_tree(unsigned long *blob,
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struct device_node **mynodes)
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{
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struct boot_param_header *device_tree =
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(struct boot_param_header *)blob;
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__unflatten_device_tree(device_tree, mynodes, &kernel_tree_alloc);
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}
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EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
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/* Everything below here references initial_boot_params directly. */
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int __initdata dt_root_addr_cells;
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int __initdata dt_root_size_cells;
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struct boot_param_header *initial_boot_params;
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#ifdef CONFIG_OF_EARLY_FLATTREE
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/**
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* of_scan_flat_dt - scan flattened tree blob and call callback on each.
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* @it: callback function
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* @data: context data pointer
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*
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* This function is used to scan the flattened device-tree, it is
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* used to extract the memory information at boot before we can
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* unflatten the tree
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*/
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int __init of_scan_flat_dt(int (*it)(unsigned long node,
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const char *uname, int depth,
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void *data),
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void *data)
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{
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unsigned long p = ((unsigned long)initial_boot_params) +
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be32_to_cpu(initial_boot_params->off_dt_struct);
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int rc = 0;
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int depth = -1;
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do {
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u32 tag = be32_to_cpup((__be32 *)p);
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char *pathp;
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p += 4;
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if (tag == OF_DT_END_NODE) {
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depth--;
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continue;
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}
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if (tag == OF_DT_NOP)
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continue;
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if (tag == OF_DT_END)
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break;
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if (tag == OF_DT_PROP) {
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u32 sz = be32_to_cpup((__be32 *)p);
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p += 8;
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if (be32_to_cpu(initial_boot_params->version) < 0x10)
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p = ALIGN(p, sz >= 8 ? 8 : 4);
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p += sz;
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p = ALIGN(p, 4);
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continue;
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}
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if (tag != OF_DT_BEGIN_NODE) {
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pr_err("Invalid tag %x in flat device tree!\n", tag);
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return -EINVAL;
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}
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depth++;
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pathp = (char *)p;
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p = ALIGN(p + strlen(pathp) + 1, 4);
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if ((*pathp) == '/') {
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char *lp, *np;
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for (lp = NULL, np = pathp; *np; np++)
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if ((*np) == '/')
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lp = np+1;
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if (lp != NULL)
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pathp = lp;
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}
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rc = it(p, pathp, depth, data);
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if (rc != 0)
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break;
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} while (1);
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return rc;
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}
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|
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/**
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* of_get_flat_dt_root - find the root node in the flat blob
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*/
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unsigned long __init of_get_flat_dt_root(void)
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{
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unsigned long p = ((unsigned long)initial_boot_params) +
|
|
be32_to_cpu(initial_boot_params->off_dt_struct);
|
|
|
|
while (be32_to_cpup((__be32 *)p) == OF_DT_NOP)
|
|
p += 4;
|
|
BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE);
|
|
p += 4;
|
|
return ALIGN(p + strlen((char *)p) + 1, 4);
|
|
}
|
|
|
|
/**
|
|
* of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr
|
|
*
|
|
* This function can be used within scan_flattened_dt callback to get
|
|
* access to properties
|
|
*/
|
|
void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
|
|
unsigned long *size)
|
|
{
|
|
return of_fdt_get_property(initial_boot_params, node, name, size);
|
|
}
|
|
|
|
/**
|
|
* of_flat_dt_is_compatible - Return true if given node has compat in compatible list
|
|
* @node: node to test
|
|
* @compat: compatible string to compare with compatible list.
|
|
*/
|
|
int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
|
|
{
|
|
return of_fdt_is_compatible(initial_boot_params, node, compat);
|
|
}
|
|
|
|
/**
|
|
* of_flat_dt_match - Return true if node matches a list of compatible values
|
|
*/
|
|
int __init of_flat_dt_match(unsigned long node, const char **compat)
|
|
{
|
|
return of_fdt_match(initial_boot_params, node, compat);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
/**
|
|
* early_init_dt_check_for_initrd - Decode initrd location from flat tree
|
|
* @node: reference to node containing initrd location ('chosen')
|
|
*/
|
|
void __init early_init_dt_check_for_initrd(unsigned long node)
|
|
{
|
|
unsigned long start, end, len;
|
|
__be32 *prop;
|
|
|
|
pr_debug("Looking for initrd properties... ");
|
|
|
|
prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
|
|
if (!prop)
|
|
return;
|
|
start = of_read_ulong(prop, len/4);
|
|
|
|
prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
|
|
if (!prop)
|
|
return;
|
|
end = of_read_ulong(prop, len/4);
|
|
|
|
early_init_dt_setup_initrd_arch(start, end);
|
|
pr_debug("initrd_start=0x%lx initrd_end=0x%lx\n", start, end);
|
|
}
|
|
#else
|
|
inline void early_init_dt_check_for_initrd(unsigned long node)
|
|
{
|
|
}
|
|
#endif /* CONFIG_BLK_DEV_INITRD */
|
|
|
|
/**
|
|
* early_init_dt_scan_root - fetch the top level address and size cells
|
|
*/
|
|
int __init early_init_dt_scan_root(unsigned long node, const char *uname,
|
|
int depth, void *data)
|
|
{
|
|
__be32 *prop;
|
|
|
|
if (depth != 0)
|
|
return 0;
|
|
|
|
dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
|
|
dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
|
|
|
|
prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
|
|
if (prop)
|
|
dt_root_size_cells = be32_to_cpup(prop);
|
|
pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
|
|
|
|
prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
|
|
if (prop)
|
|
dt_root_addr_cells = be32_to_cpup(prop);
|
|
pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
|
|
|
|
/* break now */
|
|
return 1;
|
|
}
|
|
|
|
u64 __init dt_mem_next_cell(int s, __be32 **cellp)
|
|
{
|
|
__be32 *p = *cellp;
|
|
|
|
*cellp = p + s;
|
|
return of_read_number(p, s);
|
|
}
|
|
|
|
/**
|
|
* early_init_dt_scan_memory - Look for an parse memory nodes
|
|
*/
|
|
int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
|
|
int depth, void *data)
|
|
{
|
|
char *type = of_get_flat_dt_prop(node, "device_type", NULL);
|
|
__be32 *reg, *endp;
|
|
unsigned long l;
|
|
|
|
/* We are scanning "memory" nodes only */
|
|
if (type == NULL) {
|
|
/*
|
|
* The longtrail doesn't have a device_type on the
|
|
* /memory node, so look for the node called /memory@0.
|
|
*/
|
|
if (depth != 1 || strcmp(uname, "memory@0") != 0)
|
|
return 0;
|
|
} else if (strcmp(type, "memory") != 0)
|
|
return 0;
|
|
|
|
reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
|
|
if (reg == NULL)
|
|
reg = of_get_flat_dt_prop(node, "reg", &l);
|
|
if (reg == NULL)
|
|
return 0;
|
|
|
|
endp = reg + (l / sizeof(__be32));
|
|
|
|
pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
|
|
uname, l, reg[0], reg[1], reg[2], reg[3]);
|
|
|
|
while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
|
|
u64 base, size;
|
|
|
|
base = dt_mem_next_cell(dt_root_addr_cells, ®);
|
|
size = dt_mem_next_cell(dt_root_size_cells, ®);
|
|
|
|
if (size == 0)
|
|
continue;
|
|
pr_debug(" - %llx , %llx\n", (unsigned long long)base,
|
|
(unsigned long long)size);
|
|
|
|
early_init_dt_add_memory_arch(base, size);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
|
|
int depth, void *data)
|
|
{
|
|
unsigned long l;
|
|
char *p;
|
|
|
|
pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
|
|
|
|
if (depth != 1 ||
|
|
(strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
|
|
return 0;
|
|
|
|
early_init_dt_check_for_initrd(node);
|
|
|
|
/* Retreive command line */
|
|
p = of_get_flat_dt_prop(node, "bootargs", &l);
|
|
if (p != NULL && l > 0)
|
|
strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE));
|
|
|
|
#ifdef CONFIG_CMDLINE
|
|
#ifndef CONFIG_CMDLINE_FORCE
|
|
if (p == NULL || l == 0 || (l == 1 && (*p) == 0))
|
|
#endif
|
|
strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
|
|
#endif /* CONFIG_CMDLINE */
|
|
|
|
pr_debug("Command line is: %s\n", cmd_line);
|
|
|
|
/* break now */
|
|
return 1;
|
|
}
|
|
|
|
static void *__init early_device_tree_alloc(u64 size, u64 align)
|
|
{
|
|
unsigned long mem = early_init_dt_alloc_memory_arch(size, align);
|
|
return __va(mem);
|
|
}
|
|
|
|
/**
|
|
* unflatten_device_tree - create tree of device_nodes from flat blob
|
|
*
|
|
* unflattens the device-tree passed by the firmware, creating the
|
|
* tree of struct device_node. It also fills the "name" and "type"
|
|
* pointers of the nodes so the normal device-tree walking functions
|
|
* can be used.
|
|
*/
|
|
void __init unflatten_device_tree(void)
|
|
{
|
|
__unflatten_device_tree(initial_boot_params, &allnodes,
|
|
early_device_tree_alloc);
|
|
|
|
/* Get pointer to OF "/chosen" node for use everywhere */
|
|
of_chosen = of_find_node_by_path("/chosen");
|
|
if (of_chosen == NULL)
|
|
of_chosen = of_find_node_by_path("/chosen@0");
|
|
}
|
|
|
|
#endif /* CONFIG_OF_EARLY_FLATTREE */
|