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[fdt] Add ability to locate node by phandle

Browse Source 
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2025-07-22 13:37:05 +01:00
parent e01e5ff7c6
commit fb082bd4cd
3 changed files with 133 additions and 67 deletions
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51
src/core/fdt.c
View File

@@ -482,6 +482,57 @@ int fdt_alias ( struct fdt *fdt, const char *name, unsigned int *offset ) {
return 0; return 0;
} }
/**
* Find node by package handle (phandle)
*
* @v fdt Device tree
* @v phandle Package handle
* @v offset Offset to fill in
* @ret rc Return status code
*/
int fdt_phandle ( struct fdt *fdt, uint32_t phandle, unsigned int *offset ) {
struct fdt_descriptor desc;
uint32_t value;
int depth;
int rc;
/* Initialise offset */
*offset = 0;
/* Find node with matching phandle */
for ( depth = -1 ; ; depth += desc.depth, *offset = desc.next ) {
/* Describe token */
if ( ( rc = fdt_describe ( fdt, *offset, &desc ) ) != 0 ) {
DBGC ( fdt, "FDT +%#04x has malformed node: %s\n",
*offset, strerror ( rc ) );
return rc;
}
/* Terminate when we exit the root node */
if ( ( depth == 0 ) && ( desc.depth < 0 ) )
break;
/* Ignore non-nodes */
if ( ( ! desc.name ) || desc.data )
continue;
/* Check for matching "phandle" or "linux-phandle" property */
if ( ( ( ( rc = fdt_u32 ( fdt, *offset, "phandle",
&value ) ) == 0 ) ||
( ( rc = fdt_u32 ( fdt, *offset, "linux,phandle",
&value ) ) == 0 ) ) &&
( value == phandle ) ) {
DBGC2 ( fdt, "FDT +%#04x has phandle %#02x\n",
*offset, phandle );
return 0;
}
}
DBGC ( fdt, "FDT has no phandle %#02x\n", phandle );
return -ENOENT;
}
/** /**
* Find property * Find property
* *

2
src/include/ipxe/fdt.h
View File

@@ -176,6 +176,8 @@ extern int fdt_path ( struct fdt *fdt, const char *path,
unsigned int *offset ); unsigned int *offset );
extern int fdt_alias ( struct fdt *fdt, const char *name, extern int fdt_alias ( struct fdt *fdt, const char *name,
unsigned int *offset ); unsigned int *offset );
extern int fdt_phandle ( struct fdt *fdt, uint32_t phandle,
unsigned int *offset );
extern const char * fdt_strings ( struct fdt *fdt, unsigned int offset, extern const char * fdt_strings ( struct fdt *fdt, unsigned int offset,
const char *name, unsigned int *count ); const char *name, unsigned int *count );
extern const char * fdt_string ( struct fdt *fdt, unsigned int offset, extern const char * fdt_string ( struct fdt *fdt, unsigned int offset,

147
src/tests/fdt_test.c
View File

@@ -39,10 +39,10 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/** Simplified QEMU sifive_u device tree blob */ /** Simplified QEMU sifive_u device tree blob */
static const uint8_t sifive_u[] = { static const uint8_t sifive_u[] = {
0xd0, 0x0d, 0xfe, 0xed, 0x00, 0x00, 0x05, 0x61, 0x00, 0x00, 0x00, 0x38, 0xd0, 0x0d, 0xfe, 0xed, 0x00, 0x00, 0x05, 0x8f, 0x00, 0x00, 0x00, 0x38,
0x00, 0x00, 0x04, 0x7c, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x11, 0x00, 0x00, 0x04, 0x9c, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x11,
0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe5, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf3,
0x00, 0x00, 0x04, 0x44, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x64, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x04,
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@@ -90,70 +90,74 @@ static const uint8_t sifive_u[] = {
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/** /**
@@ -257,6 +261,15 @@ static void fdt_test_exec ( void ) {
ok ( ( string = fdt_string ( &fdt, offset, "phy-mode" ) ) != NULL ); ok ( ( string = fdt_string ( &fdt, offset, "phy-mode" ) ) != NULL );
ok ( strcmp ( string, "gmii" ) == 0 ); ok ( strcmp ( string, "gmii" ) == 0 );
/* Verify phandle lookup */
ok ( fdt_phandle ( &fdt, 0x03, &offset ) == 0 );
ok ( fdt_describe ( &fdt, offset, &desc ) == 0 );
ok ( strcmp ( desc.name, "interrupt-controller" ) == 0 );
ok ( fdt_phandle ( &fdt, 0x08, &offset ) == 0 );
ok ( fdt_describe ( &fdt, offset, &desc ) == 0 );
ok ( strcmp ( desc.name, "ethernet-phy@0" ) == 0 );
ok ( fdt_phandle ( &fdt, 0x2a, &offset ) != 0 );
/* Verify node description */ /* Verify node description */
ok ( fdt_path ( &fdt, "/memory@80000000", &offset ) == 0 ); ok ( fdt_path ( &fdt, "/memory@80000000", &offset ) == 0 );
ok ( fdt_describe ( &fdt, offset, &desc ) == 0 ); ok ( fdt_describe ( &fdt, offset, &desc ) == 0 );