1333 lines
33 KiB
C
Executable File
1333 lines
33 KiB
C
Executable File
/*
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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 <common/list.h>
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#include <rtthread.h>
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#include <typedef.h>
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#include <stdbool.h>
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#include <string.h>
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#include <init.h>
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#include <log.h>
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#include "libfdt/libfdt.h"
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#include <of/of.h>
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#include <kconfig.h>
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#include "of_private.h"
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#define PTR_ALIGN(p, a) ((typeof(p))RT_ALIGN((unsigned long)(p), (a)))
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#define CONFIG_OF_EARLY_FLATTREE
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const void *of_get_flat_dt_prop(unsigned long node, const char *name, int *size);
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u64 dt_mem_next_cell(int s, const unsigned int **cellp);
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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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static int of_fdt_is_compatible(const void *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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int cplen;
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unsigned long l, score = 0;
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cp = fdt_getprop(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_is_big_endian - Return true if given node needs BE MMIO accesses
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* @blob: A device tree blob
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* @node: node to test
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*
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* Returns true if the node has a "big-endian" property, or if the kernel
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* was compiled for BE *and* the node has a "native-endian" property.
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* Returns false otherwise.
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*/
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bool of_fdt_is_big_endian(const void *blob, unsigned long node)
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{
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if (fdt_getprop(blob, node, "big-endian", NULL))
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return true;
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return false;
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}
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static bool of_fdt_device_is_available(const void *blob, unsigned long node)
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{
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const char *status = fdt_getprop(blob, node, "status", NULL);
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if (!status)
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return true;
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if (!strcmp(status, "ok") || !strcmp(status, "okay"))
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return true;
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return false;
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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(const void *blob, unsigned long node,
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const char *const *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(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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static void populate_properties(const void *blob,
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int offset,
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void **mem,
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struct device_node *np,
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const char *nodename,
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bool dryrun)
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{
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struct property *pp, **pprev = NULL;
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int cur;
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bool has_name = false;
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pprev = &np->properties;
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for (cur = fdt_first_property_offset(blob, offset);
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cur >= 0;
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cur = fdt_next_property_offset(blob, cur)) {
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const unsigned int *val;
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const char *pname;
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int sz;
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val = fdt_getprop_by_offset(blob, cur, &pname, &sz);
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if (!val) {
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__wrn("Cannot locate property at 0x%x", cur);
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continue;
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}
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if (!pname) {
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__wrn("Cannot find property name at 0x%x", cur);
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continue;
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}
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if (!strcmp(pname, "name"))
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has_name = true;
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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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continue;
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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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*/
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if (!strcmp(pname, "phandle") ||
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!strcmp(pname, "linux,phandle")) {
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if (!np->phandle)
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np->phandle = be32_to_cpup(val);
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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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*/
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if (!strcmp(pname, "ibm,phandle"))
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np->phandle = be32_to_cpup(val);
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pp->name = (char *)pname;
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pp->length = sz;
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pp->value = (unsigned int *)val;
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*pprev = pp;
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pprev = &pp->next;
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}
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/* With version 0x10 we may not have the name property,
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* recreate 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 *p = nodename, *ps = p, *pa = NULL;
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int len;
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while (*p) {
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if ((*p) == '@')
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pa = p;
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else if ((*p) == '/')
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ps = p + 1;
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p++;
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}
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if (pa < ps)
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pa = p;
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len = (pa - ps) + 1;
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pp = unflatten_dt_alloc(mem, sizeof(struct property) + len,
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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 = len;
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pp->value = pp + 1;
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*pprev = pp;
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pprev = &pp->next;
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memcpy(pp->value, ps, len - 1);
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((char *)pp->value)[len - 1] = 0;
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__log("fixed up name for %s -> %s",
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nodename, (char *)pp->value);
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}
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}
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if (!dryrun)
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*pprev = NULL;
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}
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static bool populate_node(const void *blob,
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int offset,
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void **mem,
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struct device_node *dad,
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struct device_node **pnp,
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bool dryrun)
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{
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struct device_node *np;
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const char *pathp;
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unsigned int l, allocl;
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pathp = fdt_get_name(blob, offset, &l);
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if (!pathp) {
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*pnp = NULL;
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return false;
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}
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allocl = ++l;
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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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of_node_init(np);
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np->full_name = fn = ((char *)np) + sizeof(*np);
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memcpy(fn, pathp, l);
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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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populate_properties(blob, offset, mem, np, pathp, dryrun);
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if (!dryrun) {
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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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*pnp = np;
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return true;
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}
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static void reverse_nodes(struct device_node *parent)
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{
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struct device_node *child, *next;
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/* In-depth first */
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child = parent->child;
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while (child) {
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reverse_nodes(child);
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child = child->sibling;
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}
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/* Reverse the nodes in the child list */
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child = parent->child;
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parent->child = NULL;
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while (child) {
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next = child->sibling;
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child->sibling = parent->child;
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parent->child = child;
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child = next;
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}
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}
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/**
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* unflatten_dt_nodes - 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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* @dad: Parent struct device_node
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* @nodepp: The device_node tree created by the call
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*
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* It returns the size of unflattened device tree or error code
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*/
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static int unflatten_dt_nodes(const void *blob,
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void *mem,
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struct device_node *dad,
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struct device_node **nodepp)
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{
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struct device_node *root;
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int offset = 0, depth = 0, initial_depth = 0;
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#define FDT_MAX_DEPTH 64
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struct device_node *nps[FDT_MAX_DEPTH];
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void *base = mem;
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bool dryrun = !base;
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if (nodepp)
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*nodepp = NULL;
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/*
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* We're unflattening device sub-tree if @dad is valid. There are
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* possibly multiple nodes in the first level of depth. We need
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* set @depth to 1 to make fdt_next_node() happy as it bails
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* immediately when negative @depth is found. Otherwise, the device
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* nodes except the first one won't be unflattened successfully.
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*/
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if (dad)
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depth = initial_depth = 1;
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root = dad;
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nps[depth] = dad;
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for (offset = 0;
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offset >= 0 && depth >= initial_depth;
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offset = fdt_next_node(blob, offset, &depth)) {
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if ((depth >= FDT_MAX_DEPTH))
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continue;
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if (!of_fdt_device_is_available(blob, offset))
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continue;
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if (!populate_node(blob, offset, &mem, nps[depth],
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&nps[depth+1], dryrun))
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return mem - base;
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if (!dryrun && nodepp && !*nodepp)
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*nodepp = nps[depth+1];
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if (!dryrun && !root)
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root = nps[depth+1];
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}
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if (offset < 0 && offset != -FDT_ERR_NOTFOUND) {
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__err("Error %d processing FDT", offset);
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return -1;
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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)
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reverse_nodes(root);
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return mem - base;
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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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* @dad: Parent device node
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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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* @detached: if true set OF_DETACHED on @mynodes
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*
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* Returns NULL on failure or the memory chunk containing the unflattened
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* device tree on success.
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*/
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static void *of_dt_alloc(u64 size, u64 align)
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{
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void *p;
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p = rt_calloc(size, 1);
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return p;
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}
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void *__unflatten_device_tree(const void *blob,
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struct device_node *dad,
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struct device_node **mynodes,
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void *(*dt_alloc)(u64 size, u64 align),
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bool detached)
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{
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int size;
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void *mem;
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__log(" -> unflatten_device_tree()");
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if (!blob) {
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__log("No device tree pointer");
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return NULL;
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}
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__log("Unflattening device tree:");
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__log("magic: %08x", fdt_magic(blob));
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__log("size: %08x", fdt_totalsize(blob));
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__log("version: %08x", fdt_version(blob));
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if (fdt_check_header(blob)) {
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__err("Invalid device tree blob header");
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return NULL;
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}
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/* First pass, scan for size */
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size = unflatten_dt_nodes(blob, NULL, dad, NULL);
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if (size < 0)
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return NULL;
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size = RT_ALIGN(size, 4);
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__log(" size is %d, allocating...", size);
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/* Allocate memory for the expanded device tree */
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mem = dt_alloc(size + 4, __alignof__(struct device_node));
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if (!mem)
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return NULL;
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memset(mem, 0, size);
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*(unsigned int *)(mem + size) = 0xdeadbeef;
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__log(" unflattening %p...", mem);
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/* Second pass, do actual unflattening */
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unflatten_dt_nodes(blob, mem, dad, mynodes);
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if (be32_to_cpup(mem + size) != 0xdeadbeef)
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__wrn("End of tree marker overwritten: %08x",
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be32_to_cpup(mem + size));
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if (detached && mynodes) {
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of_node_set_flag(*mynodes, OF_DETACHED);
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__log("unflattened tree is detached");
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}
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__log(" <- unflatten_device_tree()");
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return mem;
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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 rt_calloc(size, 1);
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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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* @blob: Flat device tree blob
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* @dad: Parent device node
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* @mynodes: The device tree created by the call
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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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* Returns NULL on failure or the memory chunk containing the unflattened
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* device tree on success.
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*/
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void *of_fdt_unflatten_tree(const unsigned long *blob,
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struct device_node *dad,
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struct device_node **mynodes)
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{
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void *mem;
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mem = __unflatten_device_tree(blob, dad, mynodes, &kernel_tree_alloc,
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true);
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return mem;
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}
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/* Everything below here references initial_boot_params directly. */
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int dt_root_addr_cells;
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int dt_root_size_cells;
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void *initial_boot_params;
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#ifdef CONFIG_OF_EARLY_FLATTREE
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static u32 of_fdt_crc32;
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/**
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* res_mem_reserve_reg() - reserve all memory described in 'reg' property
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*/
|
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static int __reserved_mem_reserve_reg(unsigned long node,
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const char *uname)
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{
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int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(unsigned int);
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uint32_t base, size;
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int len;
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const unsigned int *prop;
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int nomap, first = 1;
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prop = of_get_flat_dt_prop(node, "reg", &len);
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if (!prop)
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return -1;
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if (len && len % t_len != 0) {
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__err("Reserved memory: invalid reg property in '%s', skipping node.",
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uname);
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return -1;
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}
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nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
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while (len >= t_len) {
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base = dt_mem_next_cell(dt_root_addr_cells, &prop);
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size = dt_mem_next_cell(dt_root_size_cells, &prop);
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#if 0
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if (size &&
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early_init_dt_reserve_memory_arch(base, size, nomap) == 0)
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__log("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB",
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uname, &base, (unsigned long)size / SZ_1M);
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else
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__inf("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB",
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uname, &base, (unsigned long)size / SZ_1M);
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len -= t_len;
|
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if (first) {
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fdt_reserved_mem_save_node(node, uname, base, size);
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first = 0;
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}
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#endif
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}
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return 0;
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}
|
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|
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/**
|
|
* __reserved_mem_check_root() - check if #size-cells, #address-cells provided
|
|
* in /reserved-memory matches the values supported by the current implementation,
|
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* also check if ranges property has been provided
|
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*/
|
|
static int __reserved_mem_check_root(unsigned long node)
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{
|
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const unsigned int *prop;
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|
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prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
|
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if (!prop || be32_to_cpup(prop) != dt_root_size_cells)
|
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return -1;
|
|
|
|
prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
|
|
if (!prop || be32_to_cpup(prop) != dt_root_addr_cells)
|
|
return -1;
|
|
|
|
prop = of_get_flat_dt_prop(node, "ranges", NULL);
|
|
if (!prop)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fdt_scan_reserved_mem() - scan a single FDT node for reserved memory
|
|
*/
|
|
#if 0
|
|
static int __fdt_scan_reserved_mem(unsigned long node, const char *uname,
|
|
int depth, void *data)
|
|
{
|
|
static int found;
|
|
int err;
|
|
|
|
if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) {
|
|
if (__reserved_mem_check_root(node) != 0) {
|
|
__err("Reserved memory: unsupported node format, ignoring");
|
|
/* break scan */
|
|
return 1;
|
|
}
|
|
found = 1;
|
|
/* scan next node */
|
|
return 0;
|
|
} else if (!found) {
|
|
/* scan next node */
|
|
return 0;
|
|
} else if (found && depth < 2) {
|
|
/* scanning of /reserved-memory has been finished */
|
|
return 1;
|
|
}
|
|
|
|
if (!of_fdt_device_is_available(initial_boot_params, node))
|
|
return 0;
|
|
|
|
err = __reserved_mem_reserve_reg(node, uname);
|
|
if (err == -1 && of_get_flat_dt_prop(node, "size", NULL))
|
|
fdt_reserved_mem_save_node(node, uname, 0, 0);
|
|
|
|
/* scan next node */
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* early_init_fdt_scan_reserved_mem() - create reserved memory regions
|
|
*
|
|
* This function grabs memory from early allocator for device exclusive use
|
|
* defined in device tree structures. It should be called by arch specific code
|
|
* once the early allocator (i.e. memblock) has been fully activated.
|
|
*/
|
|
void early_init_fdt_scan_reserved_mem(void)
|
|
{
|
|
int n;
|
|
u64 base, size;
|
|
|
|
if (!initial_boot_params)
|
|
return;
|
|
|
|
/* Process header /memreserve/ fields */
|
|
for (n = 0; ; n++) {
|
|
fdt_get_mem_rsv(initial_boot_params, n, &base, &size);
|
|
if (!size)
|
|
break;
|
|
early_init_dt_reserve_memory_arch(base, size, 0);
|
|
}
|
|
|
|
of_scan_flat_dt(__fdt_scan_reserved_mem, NULL);
|
|
fdt_init_reserved_mem();
|
|
}
|
|
|
|
/**
|
|
* early_init_fdt_reserve_self() - reserve the memory used by the FDT blob
|
|
*/
|
|
void early_init_fdt_reserve_self(void)
|
|
{
|
|
if (!initial_boot_params)
|
|
return;
|
|
|
|
/* Reserve the dtb region */
|
|
early_init_dt_reserve_memory_arch(__pa(initial_boot_params),
|
|
fdt_totalsize(initial_boot_params),
|
|
0);
|
|
}
|
|
|
|
#endif
|
|
/**
|
|
* of_scan_flat_dt - scan flattened tree blob and call callback on each.
|
|
* @it: callback function
|
|
* @data: context data pointer
|
|
*
|
|
* This function is used to scan the flattened device-tree, it is
|
|
* used to extract the memory information at boot before we can
|
|
* unflatten the tree
|
|
*/
|
|
int of_scan_flat_dt(int (*it)(unsigned long node,
|
|
const char *uname, int depth,
|
|
void *data),
|
|
void *data)
|
|
{
|
|
const void *blob = initial_boot_params;
|
|
const char *pathp;
|
|
int offset, rc = 0, depth = -1;
|
|
|
|
if (!blob)
|
|
return 0;
|
|
|
|
for (offset = fdt_next_node(blob, -1, &depth);
|
|
offset >= 0 && depth >= 0 && !rc;
|
|
offset = fdt_next_node(blob, offset, &depth)) {
|
|
|
|
pathp = fdt_get_name(blob, offset, NULL);
|
|
if (*pathp == '/')
|
|
pathp = kbasename(pathp);
|
|
rc = it(offset, pathp, depth, data);
|
|
}
|
|
return rc;
|
|
}
|
|
/**
|
|
* of_scan_flat_dt_subnodes - scan sub-nodes of a node call callback on each.
|
|
* @it: callback function
|
|
* @data: context data pointer
|
|
*
|
|
* This function is used to scan sub-nodes of a node.
|
|
*/
|
|
int of_scan_flat_dt_subnodes(unsigned long parent,
|
|
int (*it)(unsigned long node,
|
|
const char *uname,
|
|
void *data),
|
|
void *data)
|
|
{
|
|
const void *blob = initial_boot_params;
|
|
int node;
|
|
|
|
fdt_for_each_subnode(node, blob, parent) {
|
|
const char *pathp;
|
|
int rc;
|
|
|
|
pathp = fdt_get_name(blob, node, NULL);
|
|
if (*pathp == '/')
|
|
pathp = kbasename(pathp);
|
|
rc = it(node, pathp, data);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* of_get_flat_dt_subnode_by_name - get the subnode by given name
|
|
*
|
|
* @node: the parent node
|
|
* @uname: the name of subnode
|
|
* @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none
|
|
*/
|
|
|
|
int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname)
|
|
{
|
|
return fdt_subnode_offset(initial_boot_params, node, uname);
|
|
}
|
|
|
|
/**
|
|
* of_get_flat_dt_root - find the root node in the flat blob
|
|
*/
|
|
unsigned long of_get_flat_dt_root(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* of_get_flat_dt_size - Return the total size of the FDT
|
|
*/
|
|
int of_get_flat_dt_size(void)
|
|
{
|
|
return fdt_totalsize(initial_boot_params);
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
*/
|
|
const void *of_get_flat_dt_prop(unsigned long node, const char *name,
|
|
int *size)
|
|
{
|
|
return fdt_getprop(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 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 of_flat_dt_match(unsigned long node, const char *const *compat)
|
|
{
|
|
return of_fdt_match(initial_boot_params, node, compat);
|
|
}
|
|
|
|
/**
|
|
* of_get_flat_dt_prop - Given a node in the flat blob, return the phandle
|
|
*/
|
|
uint32_t of_get_flat_dt_phandle(unsigned long node)
|
|
{
|
|
return fdt_get_phandle(initial_boot_params, node);
|
|
}
|
|
|
|
struct fdt_scan_status {
|
|
const char *name;
|
|
int namelen;
|
|
int depth;
|
|
int found;
|
|
int (*iterator)(unsigned long node, const char *uname, int depth, void *data);
|
|
void *data;
|
|
};
|
|
|
|
const char * of_flat_dt_get_machine_name(void)
|
|
{
|
|
const char *name;
|
|
unsigned long dt_root = of_get_flat_dt_root();
|
|
|
|
name = of_get_flat_dt_prop(dt_root, "model", NULL);
|
|
if (!name)
|
|
name = of_get_flat_dt_prop(dt_root, "compatible", NULL);
|
|
return name;
|
|
}
|
|
|
|
/**
|
|
* of_flat_dt_match_machine - Iterate match tables to find matching machine.
|
|
*
|
|
* @default_match: A machine specific ptr to return in case of no match.
|
|
* @get_next_compat: callback function to return next compatible match table.
|
|
*
|
|
* Iterate through machine match tables to find the best match for the machine
|
|
* compatible string in the FDT.
|
|
*/
|
|
const void * of_flat_dt_match_machine(const void *default_match,
|
|
const void * (*get_next_compat)(const char * const**))
|
|
{
|
|
const void *data = NULL;
|
|
const void *best_data = default_match;
|
|
const char *const *compat;
|
|
unsigned long dt_root;
|
|
unsigned int best_score = ~1, score = 0;
|
|
|
|
dt_root = of_get_flat_dt_root();
|
|
while ((data = get_next_compat(&compat))) {
|
|
score = of_flat_dt_match(dt_root, compat);
|
|
if (score > 0 && score < best_score) {
|
|
best_data = data;
|
|
best_score = score;
|
|
}
|
|
}
|
|
if (!best_data) {
|
|
const char *prop;
|
|
int size;
|
|
|
|
__err(" unrecognized device tree list:[ ");
|
|
|
|
prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
|
|
if (prop) {
|
|
while (size > 0) {
|
|
printk("'%s' ", prop);
|
|
size -= strlen(prop) + 1;
|
|
prop += strlen(prop) + 1;
|
|
}
|
|
}
|
|
printk("]");
|
|
return NULL;
|
|
}
|
|
|
|
__inf("Machine model: %s", of_flat_dt_get_machine_name());
|
|
|
|
return best_data;
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
#ifndef __early_init_dt_declare_initrd
|
|
static void __early_init_dt_declare_initrd(unsigned long start,
|
|
unsigned long end)
|
|
{
|
|
initrd_start = (unsigned long)__va(start);
|
|
initrd_end = (unsigned long)__va(end);
|
|
initrd_below_start_ok = 1;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* early_init_dt_check_for_initrd - Decode initrd location from flat tree
|
|
* @node: reference to node containing initrd location ('chosen')
|
|
*/
|
|
static void early_init_dt_check_for_initrd(unsigned long node)
|
|
{
|
|
u64 start, end;
|
|
int len;
|
|
const unsigned int *prop;
|
|
|
|
__log("Looking for initrd properties... ");
|
|
|
|
prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
|
|
if (!prop)
|
|
return;
|
|
start = of_read_number(prop, len/4);
|
|
|
|
prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
|
|
if (!prop)
|
|
return;
|
|
end = of_read_number(prop, len/4);
|
|
|
|
__early_init_dt_declare_initrd(start, end);
|
|
|
|
__log("initrd_start=0x%llx initrd_end=0x%llx",
|
|
(unsigned long long)start, (unsigned long long)end);
|
|
}
|
|
#else
|
|
static inline void early_init_dt_check_for_initrd(unsigned long node)
|
|
{
|
|
}
|
|
#endif /* CONFIG_BLK_DEV_INITRD */
|
|
|
|
#ifdef CONFIG_SERIAL_EARLYCON
|
|
|
|
int early_init_dt_scan_chosen_stdout(void)
|
|
{
|
|
int offset;
|
|
const char *p, *q, *options = NULL;
|
|
int l;
|
|
const struct earlycon_id *match;
|
|
const void *fdt = initial_boot_params;
|
|
|
|
offset = fdt_path_offset(fdt, "/chosen");
|
|
if (offset < 0)
|
|
offset = fdt_path_offset(fdt, "/chosen@0");
|
|
if (offset < 0)
|
|
return -1;
|
|
|
|
p = fdt_getprop(fdt, offset, "stdout-path", &l);
|
|
if (!p)
|
|
p = fdt_getprop(fdt, offset, "linux,stdout-path", &l);
|
|
if (!p || !l)
|
|
return -1;
|
|
|
|
q = strchrnul(p, ':');
|
|
if (*q != '\0')
|
|
options = q + 1;
|
|
l = q - p;
|
|
|
|
/* Get the node specified by stdout-path */
|
|
offset = fdt_path_offset_namelen(fdt, p, l);
|
|
if (offset < 0) {
|
|
__wrn("earlycon: stdout-path %.*s not found", l, p);
|
|
return 0;
|
|
}
|
|
|
|
for (match = __earlycon_table; match < __earlycon_table_end; match++) {
|
|
if (!match->compatible[0])
|
|
continue;
|
|
|
|
if (fdt_node_check_compatible(fdt, offset, match->compatible))
|
|
continue;
|
|
|
|
of_setup_earlycon(match, offset, options);
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* early_init_dt_scan_root - fetch the top level address and size cells
|
|
*/
|
|
int early_init_dt_scan_root(unsigned long node, const char *uname,
|
|
int depth, void *data)
|
|
{
|
|
const unsigned int *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);
|
|
__log("dt_root_size_cells = %x", dt_root_size_cells);
|
|
|
|
prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
|
|
if (prop)
|
|
dt_root_addr_cells = be32_to_cpup(prop);
|
|
__log("dt_root_addr_cells = %x", dt_root_addr_cells);
|
|
|
|
/* break now */
|
|
return 1;
|
|
}
|
|
|
|
u64 dt_mem_next_cell(int s, const unsigned int **cellp)
|
|
{
|
|
const unsigned int *p = *cellp;
|
|
|
|
*cellp = p + s;
|
|
return of_read_number(p, s);
|
|
}
|
|
|
|
#if 0
|
|
/**
|
|
* early_init_dt_scan_memory - Look for and parse memory nodes
|
|
*/
|
|
int early_init_dt_scan_memory(unsigned long node, const char *uname,
|
|
int depth, void *data)
|
|
{
|
|
const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
|
|
const unsigned int *reg, *endp;
|
|
int l;
|
|
bool hotpluggable;
|
|
|
|
/* 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(unsigned int));
|
|
hotpluggable = of_get_flat_dt_prop(node, "hotpluggable", NULL);
|
|
|
|
__log("memory scan node %s, reg size %d", uname, l);
|
|
|
|
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;
|
|
__log(" - %llx , %llx", (unsigned long long)base,
|
|
(unsigned long long)size);
|
|
|
|
early_init_dt_add_memory_arch(base, size);
|
|
|
|
if (!hotpluggable)
|
|
continue;
|
|
|
|
if (early_init_dt_mark_hotplug_memory_arch(base, size))
|
|
__wrn("failed to mark hotplug range 0x%llx - 0x%llx",
|
|
base, base + size);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int early_init_dt_scan_chosen(unsigned long node, const char *uname,
|
|
int depth, void *data)
|
|
{
|
|
int l;
|
|
const char *p;
|
|
|
|
__log("search \"chosen\", depth: %d, uname: %s", depth, uname);
|
|
|
|
if (depth != 1 || !data ||
|
|
(strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
|
|
return 0;
|
|
|
|
early_init_dt_check_for_initrd(node);
|
|
|
|
/* Retrieve command line */
|
|
p = of_get_flat_dt_prop(node, "bootargs", &l);
|
|
if (p != NULL && l > 0)
|
|
strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
|
|
|
|
/*
|
|
* CONFIG_CMDLINE is meant to be a default in case nothing else
|
|
* managed to set the command line, unless CONFIG_CMDLINE_FORCE
|
|
* is set in which case we override whatever was found earlier.
|
|
*/
|
|
#ifdef CONFIG_CMDLINE
|
|
#if defined(CONFIG_CMDLINE_EXTEND)
|
|
strlcat(data, " ", COMMAND_LINE_SIZE);
|
|
strlcat(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
|
|
#elif defined(CONFIG_CMDLINE_FORCE)
|
|
strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
|
|
#else
|
|
/* No arguments from boot loader, use kernel's cmdl*/
|
|
if (!((char *)data)[0])
|
|
strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
|
|
#endif
|
|
#endif /* CONFIG_CMDLINE */
|
|
|
|
__log("Command line is: %s", (char*)data);
|
|
|
|
/* break now */
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_HAVE_MEMBLOCK
|
|
#ifndef MIN_MEMBLOCK_ADDR
|
|
#define MIN_MEMBLOCK_ADDR __pa(PAGE_OFFSET)
|
|
#endif
|
|
#ifndef MAX_MEMBLOCK_ADDR
|
|
#define MAX_MEMBLOCK_ADDR ((uint32_t)~0)
|
|
#endif
|
|
|
|
void early_init_dt_add_memory_arch(u64 base, u64 size)
|
|
{
|
|
const u64 phys_offset = MIN_MEMBLOCK_ADDR;
|
|
|
|
if (!PAGE_ALIGNED(base)) {
|
|
if (size < PAGE_SIZE - (base & ~PAGE_MASK)) {
|
|
__wrn("Ignoring memory block 0x%llx - 0x%llx",
|
|
base, base + size);
|
|
return;
|
|
}
|
|
size -= PAGE_SIZE - (base & ~PAGE_MASK);
|
|
base = PAGE_ALIGN(base);
|
|
}
|
|
size &= PAGE_MASK;
|
|
|
|
if (base > MAX_MEMBLOCK_ADDR) {
|
|
__wrn("Ignoring memory block 0x%llx - 0x%llx",
|
|
base, base + size);
|
|
return;
|
|
}
|
|
|
|
if (base + size - 1 > MAX_MEMBLOCK_ADDR) {
|
|
__wrn("Ignoring memory range 0x%llx - 0x%llx",
|
|
((u64)MAX_MEMBLOCK_ADDR) + 1, base + size);
|
|
size = MAX_MEMBLOCK_ADDR - base + 1;
|
|
}
|
|
|
|
if (base + size < phys_offset) {
|
|
__wrn("Ignoring memory block 0x%llx - 0x%llx",
|
|
base, base + size);
|
|
return;
|
|
}
|
|
if (base < phys_offset) {
|
|
__wrn("Ignoring memory range 0x%llx - 0x%llx",
|
|
base, phys_offset);
|
|
size -= phys_offset - base;
|
|
base = phys_offset;
|
|
}
|
|
memblock_add(base, size);
|
|
}
|
|
|
|
int early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size)
|
|
{
|
|
return memblock_mark_hotplug(base, size);
|
|
}
|
|
|
|
int early_init_dt_reserve_memory_arch(uint32_t base,
|
|
uint32_t size, bool nomap)
|
|
{
|
|
if (nomap)
|
|
return memblock_remove(base, size);
|
|
return memblock_reserve(base, size);
|
|
}
|
|
|
|
/*
|
|
* called from unflatten_device_tree() to bootstrap devicetree itself
|
|
* Architectures can override this definition if memblock isn't used
|
|
*/
|
|
void * early_init_dt_alloc_memory_arch(u64 size, u64 align)
|
|
{
|
|
return __va(memblock_alloc(size, align));
|
|
}
|
|
#else
|
|
void early_init_dt_add_memory_arch(u64 base, u64 size)
|
|
{
|
|
}
|
|
|
|
int early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
int early_init_dt_reserve_memory_arch(uint32_t base,
|
|
uint32_t size, bool nomap)
|
|
{
|
|
__err("Reserved memory not supported, ignoring range %pa - %pa%s",
|
|
&base, &size, nomap ? " (nomap)" : "");
|
|
return -1;
|
|
}
|
|
|
|
void *early_init_dt_alloc_memory_arch(u64 size, u64 align)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
bool early_init_dt_verify(void *params)
|
|
{
|
|
if (!params)
|
|
return false;
|
|
|
|
/* check device tree validity */
|
|
if (fdt_check_header(params))
|
|
return false;
|
|
|
|
/* Setup flat device-tree pointer */
|
|
initial_boot_params = params;
|
|
/*of_fdt_crc32 = crc32_be(~0, initial_boot_params,*/
|
|
/*fdt_totalsize(initial_boot_params));*/
|
|
return true;
|
|
}
|
|
|
|
|
|
void early_init_dt_scan_nodes(void)
|
|
{
|
|
/* Retrieve various information from the /chosen node */
|
|
of_scan_flat_dt(NULL, NULL);
|
|
|
|
/* Initialize {size,address}-cells info */
|
|
of_scan_flat_dt(NULL, NULL);
|
|
|
|
/* Setup memory, calling early_init_dt_add_memory_arch */
|
|
of_scan_flat_dt(NULL, NULL);
|
|
}
|
|
|
|
bool early_init_dt_scan(void *params)
|
|
{
|
|
bool status;
|
|
|
|
status = early_init_dt_verify(params);
|
|
if (!status)
|
|
return false;
|
|
|
|
early_init_dt_scan_nodes();
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
extern unsigned char blob_input_dtb_start[];
|
|
extern unsigned char blob_input_dtb_end[];
|
|
void unflatten_device_tree(void)
|
|
{
|
|
__unflatten_device_tree(blob_input_dtb_start, NULL, &of_root,
|
|
of_dt_alloc, false);
|
|
|
|
/* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */
|
|
of_alias_scan(early_init_dt_alloc_memory_arch);
|
|
|
|
unittest_unflatten_overlay_base();
|
|
}
|
|
|
|
/**
|
|
* of_irq_find_parent - Given a device node, find its interrupt parent node
|
|
* @child: pointer to device node
|
|
*
|
|
* Returns a pointer to the interrupt parent node, or NULL if the interrupt
|
|
* parent could not be determined.
|
|
*/
|
|
struct device_node *of_irq_find_parent(struct device_node *child)
|
|
{
|
|
struct device_node *p;
|
|
phandle parent;
|
|
|
|
if (!of_node_get(child))
|
|
return NULL;
|
|
|
|
do {
|
|
if (of_property_read_u32(child, "interrupt-parent", &parent)) {
|
|
p = of_get_parent(child);
|
|
} else {
|
|
p = of_find_node_by_phandle(parent);
|
|
}
|
|
of_node_put(child);
|
|
child = p;
|
|
} while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL);
|
|
|
|
return p;
|
|
}
|
|
|
|
void dt_list_all_nodes(void)
|
|
{
|
|
struct device_node *dn = of_find_all_nodes(NULL);
|
|
const void *compatable = NULL;
|
|
|
|
while (dn) {
|
|
compatable = of_get_property(dn, "compatible", NULL);
|
|
__log("name %s, type %s, full_name %s, cmpat:%s, secodary %p, ops %p", \
|
|
dn->name, dn->type, dn->full_name, compatable, dn->fwnode.secondary, dn->fwnode.ops);
|
|
dn = of_find_all_nodes(dn);
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob
|
|
*
|
|
* Copies and 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. This should only be used when the FDT memory has not been
|
|
* reserved such is the case when the FDT is built-in to the kernel init
|
|
* section. If the FDT memory is reserved already then unflatten_device_tree
|
|
* should be used instead.
|
|
*/
|
|
#if 0
|
|
void unflatten_and_copy_device_tree(void)
|
|
{
|
|
int size;
|
|
void *dt;
|
|
|
|
if (!initial_boot_params) {
|
|
__wrn("No valid device tree found, continuing without");
|
|
return;
|
|
}
|
|
|
|
size = fdt_totalsize(initial_boot_params);
|
|
dt = early_init_dt_alloc_memory_arch(size,
|
|
roundup_pow_of_two(FDT_V17_SIZE));
|
|
|
|
if (dt) {
|
|
memcpy(dt, initial_boot_params, size);
|
|
initial_boot_params = dt;
|
|
}
|
|
unflatten_device_tree();
|
|
}
|
|
#endif
|
|
#ifdef CONFIG_SYSFS
|
|
static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *bin_attr,
|
|
char *buf, loff_t off, size_t count)
|
|
{
|
|
memcpy(buf, initial_boot_params + off, count);
|
|
return count;
|
|
}
|
|
|
|
static int of_fdt_raw_init(void)
|
|
{
|
|
static struct bin_attribute of_fdt_raw_attr =
|
|
__BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0);
|
|
|
|
if (!initial_boot_params)
|
|
return 0;
|
|
|
|
if (of_fdt_crc32 != crc32_be(~0, initial_boot_params,
|
|
fdt_totalsize(initial_boot_params))) {
|
|
__wrn("not creating '/sys/firmware/fdt': CRC check failed");
|
|
return 0;
|
|
}
|
|
of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params);
|
|
return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr);
|
|
}
|
|
late_initcall(of_fdt_raw_init);
|
|
#endif
|
|
|
|
#endif /* CONFIG_OF_EARLY_FLATTREE */
|