mirror of https://gitee.com/openkylin/linux.git
1088 lines
28 KiB
C
1088 lines
28 KiB
C
/*
|
|
* Functions for working with the Flattened Device Tree data format
|
|
*
|
|
* Copyright 2009 Benjamin Herrenschmidt, IBM Corp
|
|
* benh@kernel.crashing.org
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* version 2 as published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/initrd.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <linux/of_reserved_mem.h>
|
|
#include <linux/sizes.h>
|
|
#include <linux/string.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <asm/setup.h> /* for COMMAND_LINE_SIZE */
|
|
#ifdef CONFIG_PPC
|
|
#include <asm/machdep.h>
|
|
#endif /* CONFIG_PPC */
|
|
|
|
#include <asm/page.h>
|
|
|
|
char *of_fdt_get_string(struct boot_param_header *blob, u32 offset)
|
|
{
|
|
return ((char *)blob) +
|
|
be32_to_cpu(blob->off_dt_strings) + offset;
|
|
}
|
|
|
|
/**
|
|
* of_fdt_get_property - Given a node in the given flat blob, return
|
|
* the property ptr
|
|
*/
|
|
void *of_fdt_get_property(struct boot_param_header *blob,
|
|
unsigned long node, const char *name,
|
|
unsigned long *size)
|
|
{
|
|
unsigned long p = node;
|
|
|
|
do {
|
|
u32 tag = be32_to_cpup((__be32 *)p);
|
|
u32 sz, noff;
|
|
const char *nstr;
|
|
|
|
p += 4;
|
|
if (tag == OF_DT_NOP)
|
|
continue;
|
|
if (tag != OF_DT_PROP)
|
|
return NULL;
|
|
|
|
sz = be32_to_cpup((__be32 *)p);
|
|
noff = be32_to_cpup((__be32 *)(p + 4));
|
|
p += 8;
|
|
if (be32_to_cpu(blob->version) < 0x10)
|
|
p = ALIGN(p, sz >= 8 ? 8 : 4);
|
|
|
|
nstr = of_fdt_get_string(blob, noff);
|
|
if (nstr == NULL) {
|
|
pr_warning("Can't find property index name !\n");
|
|
return NULL;
|
|
}
|
|
if (strcmp(name, nstr) == 0) {
|
|
if (size)
|
|
*size = sz;
|
|
return (void *)p;
|
|
}
|
|
p += sz;
|
|
p = ALIGN(p, 4);
|
|
} while (1);
|
|
}
|
|
|
|
/**
|
|
* of_fdt_is_compatible - Return true if given node from the given blob has
|
|
* compat in its compatible list
|
|
* @blob: A device tree blob
|
|
* @node: node to test
|
|
* @compat: compatible string to compare with compatible list.
|
|
*
|
|
* On match, returns a non-zero value with smaller values returned for more
|
|
* specific compatible values.
|
|
*/
|
|
int of_fdt_is_compatible(struct boot_param_header *blob,
|
|
unsigned long node, const char *compat)
|
|
{
|
|
const char *cp;
|
|
unsigned long cplen, l, score = 0;
|
|
|
|
cp = of_fdt_get_property(blob, node, "compatible", &cplen);
|
|
if (cp == NULL)
|
|
return 0;
|
|
while (cplen > 0) {
|
|
score++;
|
|
if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
|
|
return score;
|
|
l = strlen(cp) + 1;
|
|
cp += l;
|
|
cplen -= l;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* of_fdt_match - Return true if node matches a list of compatible values
|
|
*/
|
|
int of_fdt_match(struct boot_param_header *blob, unsigned long node,
|
|
const char *const *compat)
|
|
{
|
|
unsigned int tmp, score = 0;
|
|
|
|
if (!compat)
|
|
return 0;
|
|
|
|
while (*compat) {
|
|
tmp = of_fdt_is_compatible(blob, node, *compat);
|
|
if (tmp && (score == 0 || (tmp < score)))
|
|
score = tmp;
|
|
compat++;
|
|
}
|
|
|
|
return score;
|
|
}
|
|
|
|
static void *unflatten_dt_alloc(void **mem, unsigned long size,
|
|
unsigned long align)
|
|
{
|
|
void *res;
|
|
|
|
*mem = PTR_ALIGN(*mem, align);
|
|
res = *mem;
|
|
*mem += size;
|
|
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* unflatten_dt_node - Alloc and populate a device_node from the flat tree
|
|
* @blob: The parent device tree blob
|
|
* @mem: Memory chunk to use for allocating device nodes and properties
|
|
* @p: pointer to node in flat tree
|
|
* @dad: Parent struct device_node
|
|
* @allnextpp: pointer to ->allnext from last allocated device_node
|
|
* @fpsize: Size of the node path up at the current depth.
|
|
*/
|
|
static void * unflatten_dt_node(struct boot_param_header *blob,
|
|
void *mem,
|
|
void **p,
|
|
struct device_node *dad,
|
|
struct device_node ***allnextpp,
|
|
unsigned long fpsize)
|
|
{
|
|
struct device_node *np;
|
|
struct property *pp, **prev_pp = NULL;
|
|
char *pathp;
|
|
u32 tag;
|
|
unsigned int l, allocl;
|
|
int has_name = 0;
|
|
int new_format = 0;
|
|
|
|
tag = be32_to_cpup(*p);
|
|
if (tag != OF_DT_BEGIN_NODE) {
|
|
pr_err("Weird tag at start of node: %x\n", tag);
|
|
return mem;
|
|
}
|
|
*p += 4;
|
|
pathp = *p;
|
|
l = allocl = strlen(pathp) + 1;
|
|
*p = PTR_ALIGN(*p + l, 4);
|
|
|
|
/* version 0x10 has a more compact unit name here instead of the full
|
|
* path. we accumulate the full path size using "fpsize", we'll rebuild
|
|
* it later. We detect this because the first character of the name is
|
|
* not '/'.
|
|
*/
|
|
if ((*pathp) != '/') {
|
|
new_format = 1;
|
|
if (fpsize == 0) {
|
|
/* root node: special case. fpsize accounts for path
|
|
* plus terminating zero. root node only has '/', so
|
|
* fpsize should be 2, but we want to avoid the first
|
|
* level nodes to have two '/' so we use fpsize 1 here
|
|
*/
|
|
fpsize = 1;
|
|
allocl = 2;
|
|
l = 1;
|
|
*pathp = '\0';
|
|
} else {
|
|
/* account for '/' and path size minus terminal 0
|
|
* already in 'l'
|
|
*/
|
|
fpsize += l;
|
|
allocl = fpsize;
|
|
}
|
|
}
|
|
|
|
np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
|
|
__alignof__(struct device_node));
|
|
if (allnextpp) {
|
|
char *fn;
|
|
of_node_init(np);
|
|
np->full_name = fn = ((char *)np) + sizeof(*np);
|
|
if (new_format) {
|
|
/* rebuild full path for new format */
|
|
if (dad && dad->parent) {
|
|
strcpy(fn, dad->full_name);
|
|
#ifdef DEBUG
|
|
if ((strlen(fn) + l + 1) != allocl) {
|
|
pr_debug("%s: p: %d, l: %d, a: %d\n",
|
|
pathp, (int)strlen(fn),
|
|
l, allocl);
|
|
}
|
|
#endif
|
|
fn += strlen(fn);
|
|
}
|
|
*(fn++) = '/';
|
|
}
|
|
memcpy(fn, pathp, l);
|
|
|
|
prev_pp = &np->properties;
|
|
**allnextpp = np;
|
|
*allnextpp = &np->allnext;
|
|
if (dad != NULL) {
|
|
np->parent = dad;
|
|
/* we temporarily use the next field as `last_child'*/
|
|
if (dad->next == NULL)
|
|
dad->child = np;
|
|
else
|
|
dad->next->sibling = np;
|
|
dad->next = np;
|
|
}
|
|
}
|
|
/* process properties */
|
|
while (1) {
|
|
u32 sz, noff;
|
|
char *pname;
|
|
|
|
tag = be32_to_cpup(*p);
|
|
if (tag == OF_DT_NOP) {
|
|
*p += 4;
|
|
continue;
|
|
}
|
|
if (tag != OF_DT_PROP)
|
|
break;
|
|
*p += 4;
|
|
sz = be32_to_cpup(*p);
|
|
noff = be32_to_cpup(*p + 4);
|
|
*p += 8;
|
|
if (be32_to_cpu(blob->version) < 0x10)
|
|
*p = PTR_ALIGN(*p, sz >= 8 ? 8 : 4);
|
|
|
|
pname = of_fdt_get_string(blob, noff);
|
|
if (pname == NULL) {
|
|
pr_info("Can't find property name in list !\n");
|
|
break;
|
|
}
|
|
if (strcmp(pname, "name") == 0)
|
|
has_name = 1;
|
|
l = strlen(pname) + 1;
|
|
pp = unflatten_dt_alloc(&mem, sizeof(struct property),
|
|
__alignof__(struct property));
|
|
if (allnextpp) {
|
|
/* We accept flattened tree phandles either in
|
|
* ePAPR-style "phandle" properties, or the
|
|
* legacy "linux,phandle" properties. If both
|
|
* appear and have different values, things
|
|
* will get weird. Don't do that. */
|
|
if ((strcmp(pname, "phandle") == 0) ||
|
|
(strcmp(pname, "linux,phandle") == 0)) {
|
|
if (np->phandle == 0)
|
|
np->phandle = be32_to_cpup((__be32*)*p);
|
|
}
|
|
/* And we process the "ibm,phandle" property
|
|
* used in pSeries dynamic device tree
|
|
* stuff */
|
|
if (strcmp(pname, "ibm,phandle") == 0)
|
|
np->phandle = be32_to_cpup((__be32 *)*p);
|
|
pp->name = pname;
|
|
pp->length = sz;
|
|
pp->value = *p;
|
|
*prev_pp = pp;
|
|
prev_pp = &pp->next;
|
|
}
|
|
*p = PTR_ALIGN((*p) + sz, 4);
|
|
}
|
|
/* with version 0x10 we may not have the name property, recreate
|
|
* it here from the unit name if absent
|
|
*/
|
|
if (!has_name) {
|
|
char *p1 = pathp, *ps = pathp, *pa = NULL;
|
|
int sz;
|
|
|
|
while (*p1) {
|
|
if ((*p1) == '@')
|
|
pa = p1;
|
|
if ((*p1) == '/')
|
|
ps = p1 + 1;
|
|
p1++;
|
|
}
|
|
if (pa < ps)
|
|
pa = p1;
|
|
sz = (pa - ps) + 1;
|
|
pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
|
|
__alignof__(struct property));
|
|
if (allnextpp) {
|
|
pp->name = "name";
|
|
pp->length = sz;
|
|
pp->value = pp + 1;
|
|
*prev_pp = pp;
|
|
prev_pp = &pp->next;
|
|
memcpy(pp->value, ps, sz - 1);
|
|
((char *)pp->value)[sz - 1] = 0;
|
|
pr_debug("fixed up name for %s -> %s\n", pathp,
|
|
(char *)pp->value);
|
|
}
|
|
}
|
|
if (allnextpp) {
|
|
*prev_pp = NULL;
|
|
np->name = of_get_property(np, "name", NULL);
|
|
np->type = of_get_property(np, "device_type", NULL);
|
|
|
|
if (!np->name)
|
|
np->name = "<NULL>";
|
|
if (!np->type)
|
|
np->type = "<NULL>";
|
|
}
|
|
while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) {
|
|
if (tag == OF_DT_NOP)
|
|
*p += 4;
|
|
else
|
|
mem = unflatten_dt_node(blob, mem, p, np, allnextpp,
|
|
fpsize);
|
|
tag = be32_to_cpup(*p);
|
|
}
|
|
if (tag != OF_DT_END_NODE) {
|
|
pr_err("Weird tag at end of node: %x\n", tag);
|
|
return mem;
|
|
}
|
|
*p += 4;
|
|
return mem;
|
|
}
|
|
|
|
/**
|
|
* __unflatten_device_tree - create tree of device_nodes from flat blob
|
|
*
|
|
* unflattens a device-tree, 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.
|
|
* @blob: The blob to expand
|
|
* @mynodes: The device_node tree created by the call
|
|
* @dt_alloc: An allocator that provides a virtual address to memory
|
|
* for the resulting tree
|
|
*/
|
|
static void __unflatten_device_tree(struct boot_param_header *blob,
|
|
struct device_node **mynodes,
|
|
void * (*dt_alloc)(u64 size, u64 align))
|
|
{
|
|
unsigned long size;
|
|
void *start, *mem;
|
|
struct device_node **allnextp = mynodes;
|
|
|
|
pr_debug(" -> unflatten_device_tree()\n");
|
|
|
|
if (!blob) {
|
|
pr_debug("No device tree pointer\n");
|
|
return;
|
|
}
|
|
|
|
pr_debug("Unflattening device tree:\n");
|
|
pr_debug("magic: %08x\n", be32_to_cpu(blob->magic));
|
|
pr_debug("size: %08x\n", be32_to_cpu(blob->totalsize));
|
|
pr_debug("version: %08x\n", be32_to_cpu(blob->version));
|
|
|
|
if (be32_to_cpu(blob->magic) != OF_DT_HEADER) {
|
|
pr_err("Invalid device tree blob header\n");
|
|
return;
|
|
}
|
|
|
|
/* First pass, scan for size */
|
|
start = ((void *)blob) + be32_to_cpu(blob->off_dt_struct);
|
|
size = (unsigned long)unflatten_dt_node(blob, 0, &start, NULL, NULL, 0);
|
|
size = ALIGN(size, 4);
|
|
|
|
pr_debug(" size is %lx, allocating...\n", size);
|
|
|
|
/* Allocate memory for the expanded device tree */
|
|
mem = dt_alloc(size + 4, __alignof__(struct device_node));
|
|
memset(mem, 0, size);
|
|
|
|
*(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef);
|
|
|
|
pr_debug(" unflattening %p...\n", mem);
|
|
|
|
/* Second pass, do actual unflattening */
|
|
start = ((void *)blob) + be32_to_cpu(blob->off_dt_struct);
|
|
unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0);
|
|
if (be32_to_cpup(start) != OF_DT_END)
|
|
pr_warning("Weird tag at end of tree: %08x\n", be32_to_cpup(start));
|
|
if (be32_to_cpup(mem + size) != 0xdeadbeef)
|
|
pr_warning("End of tree marker overwritten: %08x\n",
|
|
be32_to_cpup(mem + size));
|
|
*allnextp = NULL;
|
|
|
|
pr_debug(" <- unflatten_device_tree()\n");
|
|
}
|
|
|
|
static void *kernel_tree_alloc(u64 size, u64 align)
|
|
{
|
|
return kzalloc(size, GFP_KERNEL);
|
|
}
|
|
|
|
/**
|
|
* of_fdt_unflatten_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 of_fdt_unflatten_tree(unsigned long *blob,
|
|
struct device_node **mynodes)
|
|
{
|
|
struct boot_param_header *device_tree =
|
|
(struct boot_param_header *)blob;
|
|
__unflatten_device_tree(device_tree, mynodes, &kernel_tree_alloc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
|
|
|
|
/* Everything below here references initial_boot_params directly. */
|
|
int __initdata dt_root_addr_cells;
|
|
int __initdata dt_root_size_cells;
|
|
|
|
struct boot_param_header *initial_boot_params;
|
|
|
|
#ifdef CONFIG_OF_EARLY_FLATTREE
|
|
|
|
/**
|
|
* res_mem_reserve_reg() - reserve all memory described in 'reg' property
|
|
*/
|
|
static int __init __reserved_mem_reserve_reg(unsigned long node,
|
|
const char *uname)
|
|
{
|
|
int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
|
|
phys_addr_t base, size;
|
|
unsigned long len;
|
|
__be32 *prop;
|
|
int nomap, first = 1;
|
|
|
|
prop = of_get_flat_dt_prop(node, "reg", &len);
|
|
if (!prop)
|
|
return -ENOENT;
|
|
|
|
if (len && len % t_len != 0) {
|
|
pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n",
|
|
uname);
|
|
return -EINVAL;
|
|
}
|
|
|
|
nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
|
|
|
|
while (len >= t_len) {
|
|
base = dt_mem_next_cell(dt_root_addr_cells, &prop);
|
|
size = dt_mem_next_cell(dt_root_size_cells, &prop);
|
|
|
|
if (base && size &&
|
|
early_init_dt_reserve_memory_arch(base, size, nomap) == 0)
|
|
pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n",
|
|
uname, &base, (unsigned long)size / SZ_1M);
|
|
else
|
|
pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n",
|
|
uname, &base, (unsigned long)size / SZ_1M);
|
|
|
|
len -= t_len;
|
|
if (first) {
|
|
fdt_reserved_mem_save_node(node, uname, base, size);
|
|
first = 0;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __reserved_mem_check_root() - check if #size-cells, #address-cells provided
|
|
* in /reserved-memory matches the values supported by the current implementation,
|
|
* also check if ranges property has been provided
|
|
*/
|
|
static int __reserved_mem_check_root(unsigned long node)
|
|
{
|
|
__be32 *prop;
|
|
|
|
prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
|
|
if (!prop || be32_to_cpup(prop) != dt_root_size_cells)
|
|
return -EINVAL;
|
|
|
|
prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
|
|
if (!prop || be32_to_cpup(prop) != dt_root_addr_cells)
|
|
return -EINVAL;
|
|
|
|
prop = of_get_flat_dt_prop(node, "ranges", NULL);
|
|
if (!prop)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* fdt_scan_reserved_mem() - scan a single FDT node for reserved memory
|
|
*/
|
|
static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname,
|
|
int depth, void *data)
|
|
{
|
|
static int found;
|
|
const char *status;
|
|
int err;
|
|
|
|
if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) {
|
|
if (__reserved_mem_check_root(node) != 0) {
|
|
pr_err("Reserved memory: unsupported node format, ignoring\n");
|
|
/* 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;
|
|
}
|
|
|
|
status = of_get_flat_dt_prop(node, "status", NULL);
|
|
if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0)
|
|
return 0;
|
|
|
|
err = __reserved_mem_reserve_reg(node, uname);
|
|
if (err == -ENOENT && 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 __init early_init_fdt_scan_reserved_mem(void)
|
|
{
|
|
if (!initial_boot_params)
|
|
return;
|
|
|
|
of_scan_flat_dt(__fdt_scan_reserved_mem, NULL);
|
|
fdt_init_reserved_mem();
|
|
}
|
|
|
|
/**
|
|
* 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 __init of_scan_flat_dt(int (*it)(unsigned long node,
|
|
const char *uname, int depth,
|
|
void *data),
|
|
void *data)
|
|
{
|
|
unsigned long p = ((unsigned long)initial_boot_params) +
|
|
be32_to_cpu(initial_boot_params->off_dt_struct);
|
|
int rc = 0;
|
|
int depth = -1;
|
|
|
|
do {
|
|
u32 tag = be32_to_cpup((__be32 *)p);
|
|
const char *pathp;
|
|
|
|
p += 4;
|
|
if (tag == OF_DT_END_NODE) {
|
|
depth--;
|
|
continue;
|
|
}
|
|
if (tag == OF_DT_NOP)
|
|
continue;
|
|
if (tag == OF_DT_END)
|
|
break;
|
|
if (tag == OF_DT_PROP) {
|
|
u32 sz = be32_to_cpup((__be32 *)p);
|
|
p += 8;
|
|
if (be32_to_cpu(initial_boot_params->version) < 0x10)
|
|
p = ALIGN(p, sz >= 8 ? 8 : 4);
|
|
p += sz;
|
|
p = ALIGN(p, 4);
|
|
continue;
|
|
}
|
|
if (tag != OF_DT_BEGIN_NODE) {
|
|
pr_err("Invalid tag %x in flat device tree!\n", tag);
|
|
return -EINVAL;
|
|
}
|
|
depth++;
|
|
pathp = (char *)p;
|
|
p = ALIGN(p + strlen(pathp) + 1, 4);
|
|
if (*pathp == '/')
|
|
pathp = kbasename(pathp);
|
|
rc = it(p, pathp, depth, data);
|
|
if (rc != 0)
|
|
break;
|
|
} while (1);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* of_get_flat_dt_root - find the root node in the flat blob
|
|
*/
|
|
unsigned long __init of_get_flat_dt_root(void)
|
|
{
|
|
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 *const *compat)
|
|
{
|
|
return of_fdt_match(initial_boot_params, node, compat);
|
|
}
|
|
|
|
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;
|
|
};
|
|
|
|
/**
|
|
* fdt_scan_node_by_path - iterator for of_scan_flat_dt_by_path function
|
|
*/
|
|
static int __init fdt_scan_node_by_path(unsigned long node, const char *uname,
|
|
int depth, void *data)
|
|
{
|
|
struct fdt_scan_status *st = data;
|
|
|
|
/*
|
|
* if scan at the requested fdt node has been completed,
|
|
* return -ENXIO to abort further scanning
|
|
*/
|
|
if (depth <= st->depth)
|
|
return -ENXIO;
|
|
|
|
/* requested fdt node has been found, so call iterator function */
|
|
if (st->found)
|
|
return st->iterator(node, uname, depth, st->data);
|
|
|
|
/* check if scanning automata is entering next level of fdt nodes */
|
|
if (depth == st->depth + 1 &&
|
|
strncmp(st->name, uname, st->namelen) == 0 &&
|
|
uname[st->namelen] == 0) {
|
|
st->depth += 1;
|
|
if (st->name[st->namelen] == 0) {
|
|
st->found = 1;
|
|
} else {
|
|
const char *next = st->name + st->namelen + 1;
|
|
st->name = next;
|
|
st->namelen = strcspn(next, "/");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* scan next fdt node */
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* of_scan_flat_dt_by_path - scan flattened tree blob and call callback on each
|
|
* child of the given path.
|
|
* @path: path to start searching for children
|
|
* @it: callback function
|
|
* @data: context data pointer
|
|
*
|
|
* This function is used to scan the flattened device-tree starting from the
|
|
* node given by path. It is used to extract information (like reserved
|
|
* memory), which is required on ealy boot before we can unflatten the tree.
|
|
*/
|
|
int __init of_scan_flat_dt_by_path(const char *path,
|
|
int (*it)(unsigned long node, const char *name, int depth, void *data),
|
|
void *data)
|
|
{
|
|
struct fdt_scan_status st = {path, 0, -1, 0, it, data};
|
|
int ret = 0;
|
|
|
|
if (initial_boot_params)
|
|
ret = of_scan_flat_dt(fdt_scan_node_by_path, &st);
|
|
|
|
if (!st.found)
|
|
return -ENOENT;
|
|
else if (ret == -ENXIO) /* scan has been completed */
|
|
return 0;
|
|
else
|
|
return ret;
|
|
}
|
|
|
|
const char * __init 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 * __init 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;
|
|
long size;
|
|
|
|
pr_err("\n unrecognized device tree list:\n[ ");
|
|
|
|
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("]\n\n");
|
|
return NULL;
|
|
}
|
|
|
|
pr_info("Machine model: %s\n", of_flat_dt_get_machine_name());
|
|
|
|
return best_data;
|
|
}
|
|
|
|
#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')
|
|
*/
|
|
static void __init early_init_dt_check_for_initrd(unsigned long node)
|
|
{
|
|
u64 start, end;
|
|
unsigned long 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_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);
|
|
|
|
initrd_start = (unsigned long)__va(start);
|
|
initrd_end = (unsigned long)__va(end);
|
|
initrd_below_start_ok = 1;
|
|
|
|
pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n",
|
|
(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 */
|
|
|
|
/**
|
|
* 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 || !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
|
|
#ifndef CONFIG_CMDLINE_FORCE
|
|
if (!((char *)data)[0])
|
|
#endif
|
|
strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
|
|
#endif /* CONFIG_CMDLINE */
|
|
|
|
pr_debug("Command line is: %s\n", (char*)data);
|
|
|
|
/* break now */
|
|
return 1;
|
|
}
|
|
|
|
#ifdef CONFIG_HAVE_MEMBLOCK
|
|
void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
|
|
{
|
|
const u64 phys_offset = __pa(PAGE_OFFSET);
|
|
base &= PAGE_MASK;
|
|
size &= PAGE_MASK;
|
|
if (base + size < phys_offset) {
|
|
pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
|
|
base, base + size);
|
|
return;
|
|
}
|
|
if (base < phys_offset) {
|
|
pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
|
|
base, phys_offset);
|
|
size -= phys_offset - base;
|
|
base = phys_offset;
|
|
}
|
|
memblock_add(base, size);
|
|
}
|
|
|
|
int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
|
|
phys_addr_t size, bool nomap)
|
|
{
|
|
if (memblock_is_region_reserved(base, size))
|
|
return -EBUSY;
|
|
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 * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align)
|
|
{
|
|
return __va(memblock_alloc(size, align));
|
|
}
|
|
#else
|
|
int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
|
|
phys_addr_t size, bool nomap)
|
|
{
|
|
pr_err("Reserved memory not supported, ignoring range 0x%llx - 0x%llx%s\n",
|
|
base, size, nomap ? " (nomap)" : "");
|
|
return -ENOSYS;
|
|
}
|
|
#endif
|
|
|
|
bool __init early_init_dt_scan(void *params)
|
|
{
|
|
if (!params)
|
|
return false;
|
|
|
|
/* Setup flat device-tree pointer */
|
|
initial_boot_params = params;
|
|
|
|
/* check device tree validity */
|
|
if (be32_to_cpu(initial_boot_params->magic) != OF_DT_HEADER) {
|
|
initial_boot_params = NULL;
|
|
return false;
|
|
}
|
|
|
|
/* Retrieve various information from the /chosen node */
|
|
of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
|
|
|
|
/* Initialize {size,address}-cells info */
|
|
of_scan_flat_dt(early_init_dt_scan_root, NULL);
|
|
|
|
/* Setup memory, calling early_init_dt_add_memory_arch */
|
|
of_scan_flat_dt(early_init_dt_scan_memory, NULL);
|
|
|
|
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.
|
|
*/
|
|
void __init unflatten_device_tree(void)
|
|
{
|
|
__unflatten_device_tree(initial_boot_params, &of_allnodes,
|
|
early_init_dt_alloc_memory_arch);
|
|
|
|
/* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */
|
|
of_alias_scan(early_init_dt_alloc_memory_arch);
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
void __init unflatten_and_copy_device_tree(void)
|
|
{
|
|
int size;
|
|
void *dt;
|
|
|
|
if (!initial_boot_params) {
|
|
pr_warn("No valid device tree found, continuing without\n");
|
|
return;
|
|
}
|
|
|
|
size = __be32_to_cpu(initial_boot_params->totalsize);
|
|
dt = early_init_dt_alloc_memory_arch(size,
|
|
__alignof__(struct boot_param_header));
|
|
|
|
if (dt) {
|
|
memcpy(dt, initial_boot_params, size);
|
|
initial_boot_params = dt;
|
|
}
|
|
unflatten_device_tree();
|
|
}
|
|
|
|
#endif /* CONFIG_OF_EARLY_FLATTREE */
|