%{
#define SWIG_FILE_WITH_INIT
#include "libfdt.h"
+
+/*
+ * We rename this function here to avoid problems with swig, since we also have
+ * a struct called fdt_property. That struct causes swig to create a class in
+ * libfdt.py called fdt_property(), which confuses things.
+ */
+static int _fdt_property(void *fdt, const char *name, const char *val, int len)
+{
+ return fdt_property(fdt, name, val, len);
+}
+
%}
%pythoncode %{
raise FdtException(val)
return val
+
class Fdt:
"""Device tree class, supporting all operations
self._fdt = bytearray(data)
check_err(fdt_check_header(self._fdt));
+ def as_bytearray(self):
+ """Get the device tree contents as a bytearray
+
+ This can be passed directly to libfdt functions that access a
+ const void * for the device tree.
+
+ Returns:
+ bytearray containing the device tree
+ """
+ return bytearray(self._fdt)
+
+ def next_node(self, nodeoffset, depth, quiet=()):
+ """Find the next subnode
+
+ Args:
+ nodeoffset: Node offset of previous node
+ depth: On input, the depth of the node at nodeoffset. On output, the
+ depth of the returned node
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Returns:
+ The offset of the next node, if any
+
+ Raises:
+ FdtException if no more nodes found or other error occurs
+ """
+ return check_err(fdt_next_node(self._fdt, nodeoffset, depth), quiet)
+
+ def first_subnode(self, nodeoffset, quiet=()):
+ """Find the first subnode of a parent node
+
+ Args:
+ nodeoffset: Node offset of parent node
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Returns:
+ The offset of the first subnode, if any
+
+ Raises:
+ FdtException if no subnodes found or other error occurs
+ """
+ return check_err(fdt_first_subnode(self._fdt, nodeoffset), quiet)
+
+ def next_subnode(self, nodeoffset, quiet=()):
+ """Find the next subnode
+
+ Args:
+ nodeoffset: Node offset of previous subnode
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Returns:
+ The offset of the next subnode, if any
+
+ Raises:
+ FdtException if no more subnodes found or other error occurs
+ """
+ return check_err(fdt_next_subnode(self._fdt, nodeoffset), quiet)
+
+ def magic(self):
+ """Return the magic word from the header
+
+ Returns:
+ Magic word
+ """
+ return fdt_magic(self._fdt) & 0xffffffff
+
+ def totalsize(self):
+ """Return the total size of the device tree
+
+ Returns:
+ Total tree size in bytes
+ """
+ return check_err(fdt_totalsize(self._fdt))
+
+ def off_dt_struct(self):
+ """Return the start of the device-tree struct area
+
+ Returns:
+ Start offset of struct area
+ """
+ return check_err(fdt_off_dt_struct(self._fdt))
+
+ def off_dt_strings(self):
+ """Return the start of the device-tree string area
+
+ Returns:
+ Start offset of string area
+ """
+ return check_err(fdt_off_dt_strings(self._fdt))
+
+ def off_mem_rsvmap(self):
+ """Return the start of the memory reserve map
+
+ Returns:
+ Start offset of memory reserve map
+ """
+ return check_err(fdt_off_mem_rsvmap(self._fdt))
+
+ def version(self):
+ """Return the version of the device tree
+
+ Returns:
+ Version number of the device tree
+ """
+ return check_err(fdt_version(self._fdt))
+
+ def last_comp_version(self):
+ """Return the last compatible version of the device tree
+
+ Returns:
+ Last compatible version number of the device tree
+ """
+ return check_err(fdt_last_comp_version(self._fdt))
+
+ def boot_cpuid_phys(self):
+ """Return the physical boot CPU ID
+
+ Returns:
+ Physical boot CPU ID
+ """
+ return check_err(fdt_boot_cpuid_phys(self._fdt))
+
+ def size_dt_strings(self):
+ """Return the start of the device-tree string area
+
+ Returns:
+ Start offset of string area
+ """
+ return check_err(fdt_size_dt_strings(self._fdt))
+
+ def size_dt_struct(self):
+ """Return the start of the device-tree struct area
+
+ Returns:
+ Start offset of struct area
+ """
+ return check_err(fdt_size_dt_struct(self._fdt))
+
+ def num_mem_rsv(self, quiet=()):
+ """Return the number of memory reserve-map records
+
+ Returns:
+ Number of memory reserve-map records
+ """
+ return check_err(fdt_num_mem_rsv(self._fdt), quiet)
+
+ def get_mem_rsv(self, index, quiet=()):
+ """Return the indexed memory reserve-map record
+
+ Args:
+ index: Record to return (0=first)
+
+ Returns:
+ Number of memory reserve-map records
+ """
+ return check_err(fdt_get_mem_rsv(self._fdt, index), quiet)
+
def subnode_offset(self, parentoffset, name, quiet=()):
"""Get the offset of a named subnode
"""
return check_err(fdt_path_offset(self._fdt, path), quiet)
+ def get_name(self, nodeoffset):
+ """Get the name of a node
+
+ Args:
+ nodeoffset: Offset of node to check
+
+ Returns:
+ Node name
+
+ Raises:
+ FdtException on error (e.g. nodeoffset is invalid)
+ """
+ return check_err_null(fdt_get_name(self._fdt, nodeoffset))[0]
+
def first_property_offset(self, nodeoffset, quiet=()):
"""Get the offset of the first property in a node offset
return check_err(fdt_next_property_offset(self._fdt, prop_offset),
quiet)
- def get_name(self, nodeoffset):
- """Get the name of a node
-
- Args:
- nodeoffset: Offset of node to check
-
- Returns:
- Node name
-
- Raises:
- FdtException on error (e.g. nodeoffset is invalid)
- """
- return check_err_null(fdt_get_name(self._fdt, nodeoffset))[0]
-
def get_property_by_offset(self, prop_offset, quiet=()):
"""Obtains a property that can be examined
return pdata
return Property(pdata[0], pdata[1])
- def first_subnode(self, nodeoffset, quiet=()):
- """Find the first subnode of a parent node
+ @staticmethod
+ def create_empty_tree(size, quiet=()):
+ """Create an empty device tree ready for use
Args:
- nodeoffset: Node offset of parent node
- quiet: Errors to ignore (empty to raise on all errors)
+ size: Size of device tree in bytes
Returns:
- The offset of the first subnode, if any
-
- Raises:
- FdtException if no subnode found or other error occurs
+ Fdt object containing the device tree
"""
- return check_err(fdt_first_subnode(self._fdt, nodeoffset), quiet)
-
- def next_subnode(self, nodeoffset, quiet=()):
- """Find the next subnode
+ data = bytearray(size)
+ err = check_err(fdt_create_empty_tree(data, size), quiet)
+ if err:
+ return err
+ return Fdt(data)
- Args:
- nodeoffset: Node offset of previous subnode
- quiet: Errors to ignore (empty to raise on all errors)
+ def open_into(self, size, quiet=()):
+ """Move the device tree into a larger or smaller space
- Returns:
- The offset of the next subnode, if any
+ This creates a new device tree of size @size and moves the existing
+ device tree contents over to that. It can be used to create more space
+ in a device tree.
- Raises:
- FdtException if no more subnode found or other error occurs
- """
- return check_err(fdt_next_subnode(self._fdt, nodeoffset), quiet)
-
- def totalsize(self):
- """Return the total size of the device tree
-
- Returns:
- Total tree size in bytes
- """
- return check_err(fdt_totalsize(self._fdt))
-
- def off_dt_struct(self):
- """Return the start of the device tree struct area
-
- Returns:
- Start offset of struct area
+ Args:
+ size: Required new size of device tree in bytes
"""
- return check_err(fdt_off_dt_struct(self._fdt))
+ fdt = bytearray(size)
+ fdt[:len(self._fdt)] = self._fdt
+ err = check_err(fdt_open_into(self._fdt, fdt, size), quiet)
+ if err:
+ return err
+ self._fdt = fdt
def pack(self, quiet=()):
"""Pack the device tree to remove unused space
"""
return check_err(fdt_pack(self._fdt), quiet)
- def delprop(self, nodeoffset, prop_name):
- """Delete a property from a node
+ def getprop(self, nodeoffset, prop_name, quiet=()):
+ """Get a property from a node
Args:
- nodeoffset: Node offset containing property to delete
- prop_name: Name of property to delete
+ nodeoffset: Node offset containing property to get
+ prop_name: Name of property to get
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Returns:
+ Value of property as a string, or -ve error number
Raises:
- FdtError if the property does not exist, or another error occurs
+ FdtError if any error occurs (e.g. the property is not found)
"""
- return check_err(fdt_delprop(self._fdt, nodeoffset, prop_name))
+ pdata = check_err_null(fdt_getprop(self._fdt, nodeoffset, prop_name),
+ quiet)
+ if isinstance(pdata, (int)):
+ return pdata
+ return str(pdata[0])
- def getprop(self, nodeoffset, prop_name, quiet=()):
- """Get a property from a node
+ def getprop_obj(self, nodeoffset, prop_name, quiet=()):
+ """Get a property from a node as a Property object
Args:
nodeoffset: Node offset containing property to get
quiet: Errors to ignore (empty to raise on all errors)
Returns:
- Value of property as a bytearray, or -ve error number
+ Property object, or None if not found
Raises:
FdtError if any error occurs (e.g. the property is not found)
pdata = check_err_null(fdt_getprop(self._fdt, nodeoffset, prop_name),
quiet)
if isinstance(pdata, (int)):
- return pdata
- return bytearray(pdata[0])
+ return None
+ return Property(prop_name, bytearray(pdata[0]))
def get_phandle(self, nodeoffset):
"""Get the phandle of a node
"""
return check_err(fdt_parent_offset(self._fdt, nodeoffset), quiet)
+ def set_name(self, nodeoffset, name, quiet=()):
+ """Set the name of a node
+
+ Args:
+ nodeoffset: Node offset of node to update
+ name: New node name
+
+ Returns:
+ Error code, or 0 if OK
+
+ Raises:
+ FdtException if no parent found or other error occurs
+ """
+ return check_err(fdt_set_name(self._fdt, nodeoffset, name), quiet)
+
+ def setprop(self, nodeoffset, prop_name, val, quiet=()):
+ """Set the value of a property
+
+ Args:
+ nodeoffset: Node offset containing the property to create/update
+ prop_name: Name of property
+ val: Value to write (string or bytearray)
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Returns:
+ Error code, or 0 if OK
+
+ Raises:
+ FdtException if no parent found or other error occurs
+ """
+ return check_err(fdt_setprop(self._fdt, nodeoffset, prop_name, val,
+ len(val)), quiet)
+
+ def setprop_u32(self, nodeoffset, prop_name, val, quiet=()):
+ """Set the value of a property
+
+ Args:
+ nodeoffset: Node offset containing the property to create/update
+ prop_name: Name of property
+ val: Value to write (integer)
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Returns:
+ Error code, or 0 if OK
+
+ Raises:
+ FdtException if no parent found or other error occurs
+ """
+ return check_err(fdt_setprop_u32(self._fdt, nodeoffset, prop_name, val),
+ quiet)
+
+ def setprop_u64(self, nodeoffset, prop_name, val, quiet=()):
+ """Set the value of a property
+
+ Args:
+ nodeoffset: Node offset containing the property to create/update
+ prop_name: Name of property
+ val: Value to write (integer)
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Returns:
+ Error code, or 0 if OK
+
+ Raises:
+ FdtException if no parent found or other error occurs
+ """
+ return check_err(fdt_setprop_u64(self._fdt, nodeoffset, prop_name, val),
+ quiet)
+
+ def setprop_str(self, nodeoffset, prop_name, val, quiet=()):
+ """Set the string value of a property
+
+ The property is set to the string, with a nul terminator added
+
+ Args:
+ nodeoffset: Node offset containing the property to create/update
+ prop_name: Name of property
+ val: Value to write (string without nul terminator)
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Returns:
+ Error code, or 0 if OK
+
+ Raises:
+ FdtException if no parent found or other error occurs
+ """
+ val += '\0'
+ return check_err(fdt_setprop(self._fdt, nodeoffset, prop_name,
+ val, len(val)), quiet)
+
+ def delprop(self, nodeoffset, prop_name):
+ """Delete a property from a node
+
+ Args:
+ nodeoffset: Node offset containing property to delete
+ prop_name: Name of property to delete
+
+ Raises:
+ FdtError if the property does not exist, or another error occurs
+ """
+ return check_err(fdt_delprop(self._fdt, nodeoffset, prop_name))
+
def node_offset_by_phandle(self, phandle, quiet=()):
"""Get the offset of a node with the given phandle
"""
return check_err(fdt_node_offset_by_phandle(self._fdt, phandle), quiet)
-class Property:
+
+class Property(bytearray):
"""Holds a device tree property name and value.
This holds a copy of a property taken from the device tree. It does not
Properties:
name: Property name
- value: Proper value as a bytearray
+ value: Property value as a bytearray
"""
def __init__(self, name, value):
+ bytearray.__init__(self, value)
self.name = name
- self.value = value
+
+ def as_cell(self, fmt):
+ return struct.unpack('>' + fmt, self)[0]
+
+ def as_uint32(self):
+ return self.as_cell('L')
+
+ def as_int32(self):
+ return self.as_cell('l')
+
+ def as_uint64(self):
+ return self.as_cell('Q')
+
+ def as_int64(self):
+ return self.as_cell('q')
+
+ def as_str(self):
+ return self[:-1]
+
+
+class FdtSw(object):
+ """Software interface to create a device tree from scratch
+
+ The methods in this class work by adding to an existing 'partial' device
+ tree buffer of a fixed size created by instantiating this class. When the
+ tree is complete, call finish() to complete the device tree so that it can
+ be used.
+
+ Similarly with nodes, a new node is started with begin_node() and finished
+ with end_node().
+
+ The context manager functions can be used to make this a bit easier:
+
+ # First create the device tree with a node and property:
+ with FdtSw(small_size) as sw:
+ with sw.AddNode('node'):
+ sw.property_u32('reg', 2)
+ fdt = sw.AsFdt()
+
+ # Now we can use it as a real device tree
+ fdt.setprop_u32(0, 'reg', 3)
+ """
+ def __init__(self, size, quiet=()):
+ fdtrw = bytearray(size)
+ err = check_err(fdt_create(fdtrw, size))
+ if err:
+ return err
+ self._fdtrw = fdtrw
+
+ def __enter__(self):
+ """Contact manager to use to create a device tree via software"""
+ return self
+
+ def __exit__(self, type, value, traceback):
+ check_err(fdt_finish(self._fdtrw))
+
+ def AsFdt(self):
+ """Convert a FdtSw into an Fdt so it can be accessed as normal
+
+ Note that finish() must be called before this function will work. If
+ you are using the context manager (see 'with' code in the FdtSw class
+ comment) then this will happen automatically.
+
+ Returns:
+ Fdt object allowing access to the newly created device tree
+ """
+ return Fdt(self._fdtrw)
+
+ def resize(self, size, quiet=()):
+ """Resize the buffer to accommodate a larger tree
+
+ Args:
+ size: New size of tree
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Raises:
+ FdtException if no node found or other error occurs
+ """
+ fdt = bytearray(size)
+ fdt[:len(self._fdtrw)] = self._fdtrw
+ err = check_err(fdt_resize(self._fdtrw, fdt, size), quiet)
+ if err:
+ return err
+ self._fdtrw = fdt
+
+ def add_reservemap_entry(self, addr, size, quiet=()):
+ """Add a new memory reserve map entry
+
+ Once finished adding, you must call finish_reservemap().
+
+ Args:
+ addr: 64-bit start address
+ size: 64-bit size
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Raises:
+ FdtException if no node found or other error occurs
+ """
+ return check_err(fdt_add_reservemap_entry(self._fdtrw, addr, size),
+ quiet)
+
+ def finish_reservemap(self, quiet=()):
+ """Indicate that there are no more reserve map entries to add
+
+ Args:
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Raises:
+ FdtException if no node found or other error occurs
+ """
+ return check_err(fdt_finish_reservemap(self._fdtrw), quiet)
+
+ def begin_node(self, name, quiet=()):
+ """Begin a new node
+
+ Use this before adding properties to the node. Then call end_node() to
+ finish it. You can also use the context manager as shown in the FdtSw
+ class comment.
+
+ Args:
+ name: Name of node to begin
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Raises:
+ FdtException if no node found or other error occurs
+ """
+ return check_err(fdt_begin_node(self._fdtrw, name), quiet)
+
+ def property_string(self, name, string, quiet=()):
+ """Add a property with a string value
+
+ The string will be nul-terminated when written to the device tree
+
+ Args:
+ name: Name of property to add
+ string: String value of property
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Raises:
+ FdtException if no node found or other error occurs
+ """
+ return check_err(fdt_property_string(self._fdtrw, name, string), quiet)
+
+ def property_u32(self, name, val, quiet=()):
+ """Add a property with a 32-bit value
+
+ Write a single-cell value to the device tree
+
+ Args:
+ name: Name of property to add
+ val: Value of property
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Raises:
+ FdtException if no node found or other error occurs
+ """
+ return check_err(fdt_property_u32(self._fdtrw, name, val), quiet)
+
+ def property_u64(self, name, val, quiet=()):
+ """Add a property with a 64-bit value
+
+ Write a double-cell value to the device tree in big-endian format
+
+ Args:
+ name: Name of property to add
+ val: Value of property
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Raises:
+ FdtException if no node found or other error occurs
+ """
+ return check_err(fdt_property_u64(self._fdtrw, name, val), quiet)
+
+ def property_cell(self, name, val, quiet=()):
+ """Add a property with a single-cell value
+
+ Write a single-cell value to the device tree
+
+ Args:
+ name: Name of property to add
+ val: Value of property
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Raises:
+ FdtException if no node found or other error occurs
+ """
+ return check_err(fdt_property_cell(self._fdtrw, name, val), quiet)
+
+ def property(self, name, val, quiet=()):
+ """Add a property
+
+ Write a new property with the given value to the device tree. The value
+ is taken as is and is not nul-terminated
+
+ Args:
+ name: Name of property to add
+ val: Value of property
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Raises:
+ FdtException if no node found or other error occurs
+ """
+ return check_err(_fdt_property(self._fdtrw, name, val, len(val)), quiet)
+
+ def end_node(self, quiet=()):
+ """End a node
+
+ Use this after adding properties to a node to close it off. You can also
+ use the context manager as shown in the FdtSw class comment.
+
+ Args:
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Raises:
+ FdtException if no node found or other error occurs
+ """
+ return check_err(fdt_end_node(self._fdtrw), quiet)
+
+ def finish(self, quiet=()):
+ """Finish writing the device tree
+
+ This closes off the device tree ready for use
+
+ Args:
+ quiet: Errors to ignore (empty to raise on all errors)
+
+ Raises:
+ FdtException if no node found or other error occurs
+ """
+ return check_err(fdt_finish(self._fdtrw), quiet)
+
+ def AddNode(self, name):
+ """Create a new context for adding a node
+
+ When used in a 'with' clause this starts a new node and finishes it
+ afterward.
+
+ Args:
+ name: Name of node to add
+ """
+ return NodeAdder(self._fdtrw, name)
+
+
+class NodeAdder():
+ """Class to provide a node context
+
+ This allows you to add nodes in a more natural way:
+
+ with fdtsw.AddNode('name'):
+ fdtsw.property_string('test', 'value')
+
+ The node is automatically completed with a call to end_node() when the
+ context exits.
+ """
+ def __init__(self, fdt, name):
+ self._fdt = fdt
+ self._name = name
+
+ def __enter__(self):
+ check_err(fdt_begin_node(self._fdt, self._name))
+
+ def __exit__(self, type, value, traceback):
+ check_err(fdt_end_node(self._fdt))
%}
%rename(fdt_property) fdt_property_func;
fdt = fdt; /* avoid unused variable warning */
}
+/* typemap used for fdt_get_property_by_offset() */
%typemap(out) (struct fdt_property *) {
PyObject *buff;
$result = Py_BuildValue("s#", $1, *arg4);
}
+/* typemap used for fdt_setprop() */
+%typemap(in) (const void *val) {
+ $1 = PyString_AsString($input); /* char *str */
+}
+
+/* typemap used for fdt_add_reservemap_entry() */
+%typemap(in) uint64_t {
+ $1 = PyLong_AsUnsignedLong($input);
+}
+
+/* typemaps used for fdt_next_node() */
+%typemap(in, numinputs=1) int *depth (int depth) {
+ depth = (int) PyInt_AsLong($input);
+ $1 = &depth;
+}
+
+%typemap(argout) int *depth {
+ PyObject *val = Py_BuildValue("i", *arg$argnum);
+ resultobj = SWIG_Python_AppendOutput(resultobj, val);
+}
+
+%apply int *depth { int *depth };
+
+/* typemaps for fdt_get_mem_rsv */
+%typemap(in, numinputs=0) uint64_t * (uint64_t temp) {
+ $1 = &temp;
+}
+
+%typemap(argout) uint64_t * {
+ PyObject *val = PyLong_FromUnsignedLong(*arg$argnum);
+ if (!result) {
+ if (PyTuple_GET_SIZE(resultobj) == 0)
+ resultobj = val;
+ else
+ resultobj = SWIG_Python_AppendOutput(resultobj, val);
+ }
+}
+
/* We have both struct fdt_property and a function fdt_property() */
%warnfilter(302) fdt_property;
int fdt_boot_cpuid_phys(const void *fdt);
int fdt_size_dt_strings(const void *fdt);
int fdt_size_dt_struct(const void *fdt);
+int fdt_property_string(void *fdt, const char *name, const char *val);
+int fdt_property_cell(void *fdt, const char *name, uint32_t val);
+
+/*
+ * This function has a stub since the name fdt_property is used for both a
+ * function and a struct, which confuses SWIG.
+ */
+int _fdt_property(void *fdt, const char *name, const char *val, int len);
%include <../libfdt/libfdt.h>
projects / u-boot / commitdiff