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of/fdt: use libfdt accessors for header data 

With libfdt support, we can take advantage of helper accessors in libfdt
for accessing the FDT header data. This makes the code more readable and
makes the FDT blob structure more opaque to the kernel. This also
prepares for removing struct boot_param_header completely.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Tested-by: Grant Likely <grant.likely@linaro.org>
Tested-by: Stephen Chivers <schivers@csc.com>
This commit is contained in:
Rob Herring 2014-04-01 22:48:01 -05:00
parent e6a6928c3e
commit c972de1497
2 changed files with 16 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/of/fdt.c
View File

@ -34,7 +34,7 @@
* 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,
int of_fdt_is_compatible(const void *blob,
unsigned long node, const char *compat)
{
const char *cp;
@ -59,7 +59,7 @@ int of_fdt_is_compatible(struct boot_param_header *blob,
/**
* 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,
int of_fdt_match(const void *blob, unsigned long node,
const char *const *compat)
{
unsigned int tmp, score = 0;
@ -98,7 +98,7 @@ static void *unflatten_dt_alloc(void **mem, unsigned long size,
* @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,
static void * unflatten_dt_node(void *blob,
void *mem,
int *poffset,
struct device_node *dad,
@ -295,7 +295,7 @@ static void * unflatten_dt_node(struct boot_param_header *blob,
* @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,
static void __unflatten_device_tree(void *blob,
struct device_node **mynodes,
void * (*dt_alloc)(u64 size, u64 align))
{
@ -312,11 +312,11 @@ static void __unflatten_device_tree(struct boot_param_header *blob,
}
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));
pr_debug("magic: %08x\n", fdt_magic(blob));
pr_debug("size: %08x\n", fdt_totalsize(blob));
pr_debug("version: %08x\n", fdt_version(blob));
if (be32_to_cpu(blob->magic) != OF_DT_HEADER) {
if (fdt_check_header(blob)) {
pr_err("Invalid device tree blob header\n");
return;
}
@ -363,9 +363,7 @@ static void *kernel_tree_alloc(u64 size, u64 align)
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);
__unflatten_device_tree(blob, mynodes, &kernel_tree_alloc);
}
EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
@ -852,7 +850,7 @@ bool __init early_init_dt_scan(void *params)
initial_boot_params = params;
/* check device tree validity */
if (be32_to_cpu(initial_boot_params->magic) != OF_DT_HEADER) {
if (fdt_check_header(params)) {
initial_boot_params = NULL;
return false;
}
@ -907,9 +905,9 @@ void __init unflatten_and_copy_device_tree(void)
return;
}
size = __be32_to_cpu(initial_boot_params->totalsize);
size = fdt_totalsize(initial_boot_params);
dt = early_init_dt_alloc_memory_arch(size,
__alignof__(struct boot_param_header));
roundup_pow_of_two(FDT_V17_SIZE));
if (dt) {
memcpy(dt, initial_boot_params, size);

8
include/linux/of_fdt.h
View File

@ -62,15 +62,15 @@ struct boot_param_header {
struct device_node;
/* For scanning an arbitrary device-tree at any time */
extern char *of_fdt_get_string(struct boot_param_header *blob, u32 offset);
extern void *of_fdt_get_property(struct boot_param_header *blob,
extern char *of_fdt_get_string(const void *blob, u32 offset);
extern void *of_fdt_get_property(const void *blob,
unsigned long node,
const char *name,
int *size);
extern int of_fdt_is_compatible(struct boot_param_header *blob,
extern int of_fdt_is_compatible(const void *blob,
unsigned long node,
const char *compat);
extern int of_fdt_match(struct boot_param_header *blob, unsigned long node,
extern int of_fdt_match(const void *blob, unsigned long node,
const char *const *compat);
extern void of_fdt_unflatten_tree(unsigned long *blob,
struct device_node **mynodes);