[fdt] Add ability to locate node by phandle

Signed-off-by: Michael Brown <mcb30@ipxe.org>

diff --git a/src/core/fdt.c b/src/core/fdt.c
index 149348199fbd8c9e49873b26020dc3aee02bddfa..6989690bf3130112fa9cf1c9fd48dc88592236bd 100644 (file)
--- a/src/core/fdt.c
+++ b/src/core/fdt.c
@@ -482,6 +482,57 @@ int fdt_alias ( struct fdt *fdt, const char *name, unsigned int *offset ) {
        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
  *

diff --git a/src/include/ipxe/fdt.h b/src/include/ipxe/fdt.h
index d5a0d21795611e7024f787c90859070bdb5bdb26..c73389ad78807c469b7580375b2a88f17bf9c15f 100644 (file)
--- a/src/include/ipxe/fdt.h
+++ b/src/include/ipxe/fdt.h
@@ -176,6 +176,8 @@ extern int fdt_path ( struct fdt *fdt, const char *path,
                      unsigned int *offset );
 extern int fdt_alias ( struct fdt *fdt, const char *name,
                       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,
                                  const char *name, unsigned int *count );
 extern const char * fdt_string ( struct fdt *fdt, unsigned int offset,

diff --git a/src/tests/fdt_test.c b/src/tests/fdt_test.c
index 0be0acdbc0afeff2fe9c664e3fb7123837a3822c..099a093b426260242401f9fda03cbf1a8377ef2a 100644 (file)
--- a/src/tests/fdt_test.c
+++ b/src/tests/fdt_test.c
@@ -39,10 +39,10 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
 
 /** Simplified QEMU sifive_u device tree blob */
 static const uint8_t sifive_u[] = {
-       0xd0, 0x0d, 0xfe, 0xed, 0x00, 0x00, 0x05, 0x61, 0x00, 0x00, 0x00, 0x38,
-       0x00, 0x00, 0x04, 0x7c, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x11,
-       0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xe5,
-       0x00, 0x00, 0x04, 0x44, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+       0xd0, 0x0d, 0xfe, 0xed, 0x00, 0x00, 0x05, 0x8f, 0x00, 0x00, 0x00, 0x38,
+       0x00, 0x00, 0x04, 0x9c, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x11,
+       0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf3,
+       0x00, 0x00, 0x04, 0x64, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x04,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x03,
@@ -90,70 +90,74 @@ static const uint8_t sifive_u[] = {
        0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00,
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+       0x6e, 0x74, 0x65, 0x72, 0x72, 0x75, 0x70, 0x74, 0x2d, 0x63, 0x65, 0x6c,
+       0x6c, 0x73, 0x00, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x72, 0x75, 0x70, 0x74,
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+       0x6c, 0x69, 0x6e, 0x75, 0x78, 0x2c, 0x70, 0x68, 0x61, 0x6e, 0x64, 0x6c,
+       0x65, 0x00, 0x72, 0x61, 0x6e, 0x67, 0x65, 0x73, 0x00, 0x6c, 0x6f, 0x63,
+       0x61, 0x6c, 0x2d, 0x6d, 0x61, 0x63, 0x2d, 0x61, 0x64, 0x64, 0x72, 0x65,
+       0x73, 0x73, 0x00, 0x70, 0x68, 0x79, 0x2d, 0x68, 0x61, 0x6e, 0x64, 0x6c,
+       0x65, 0x00, 0x70, 0x68, 0x79, 0x2d, 0x6d, 0x6f, 0x64, 0x65, 0x00, 0x72,
+       0x65, 0x67, 0x2d, 0x6e, 0x61, 0x6d, 0x65, 0x73, 0x00, 0x6d, 0x61, 0x78,
+       0x2d, 0x73, 0x70, 0x65, 0x65, 0x64, 0x00
 };
 
 /**
@@ -257,6 +261,15 @@ static void fdt_test_exec ( void ) {
        ok ( ( string = fdt_string ( &fdt, offset, "phy-mode" ) ) != NULL );
        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 */
        ok ( fdt_path ( &fdt, "/memory@80000000", &offset ) == 0 );
        ok ( fdt_describe ( &fdt, offset, &desc ) == 0 );