diff --git a/ethosu/vela/tosa_mapping.py b/ethosu/vela/tosa_mapping.py
new file mode 100644
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+++ b/ethosu/vela/tosa_mapping.py
@@ -0,0 +1,325 @@
+# Copyright (C) 2021 Arm Limited or its affiliates. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the License); you may
+# not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an AS IS BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# Description:
+# TOSA mapping functions used by reader.
+# Contains a mapping from the various TOSA enums and options structs, generated by the FlatBuffer code
+# generator, to Vela's internal format.
+from .data_type import DataType
+from .operation import Op
+from .operation import TensorIndices
+from .tosa import ArithmeticRightShiftAttribute  # noqa: F401
+from .tosa import AxisAttribute  # noqa: F401
+from .tosa import ClampAttribute  # noqa: F401
+from .tosa import CondIfAttribute  # noqa: F401
+from .tosa import Conv2dAttribute  # noqa: F401
+from .tosa import ConvQuantInfo  # noqa: F401
+from .tosa import MatMulQuantInfo  # noqa: F401
+from .tosa import MulAttribute  # noqa: F401
+from .tosa import PadQuantInfo  # noqa: F401
+from .tosa import Pool2dAttribute  # noqa: F401
+from .tosa import ReluNAttribute  # noqa: F401
+from .tosa import RescaleAttribute  # noqa: F401
+from .tosa import ReshapeAttribute  # noqa: F401
+from .tosa import ResizeAttribute  # noqa: F401
+from .tosa import SliceAttribute  # noqa: F401
+from .tosa import TileAttribute  # noqa: F401
+from .tosa import TransposeConv2dAttribute  # noqa: F401
+from .tosa import UnaryQuantInfo  # noqa: F401
+from .tosa import WhileLoopAttribute  # noqa: F401
+from .tosa.DType import DType
+from .tosa.Op import Op as TosaOp
+
+
+datatype_map = {
+    DType.BOOL: DataType.bool,
+    DType.UINT8: DataType.uint8,
+    DType.INT4: DataType.int4,
+    DType.INT8: DataType.int8,
+    DType.INT16: DataType.int16,
+    DType.INT32: DataType.int32,
+    DType.INT48: DataType.int48,
+    DType.FLOAT: DataType.float32,
+}
+
+
+# TODO duplicate of tflite_mapping
+def underscore_to_camel_case(s):
+    return "".join(x.title() for x in s.split("_"))
+
+
+# TODO duplicate of tflite_mapping
+def identity(x):
+    return x
+
+
+class AttrSerializer:
+    def __init__(self, name, members=None):
+        self.name = name
+        self.module = globals()[self.name]
+        self.cls = getattr(self.module, self.name)
+        self.members = []
+        if members is not None:
+            for mem in members:
+                deserialize = identity
+                is_vector = False
+                if isinstance(mem, tuple):
+                    if len(mem) == 2:
+                        mem, is_vector = mem
+                        deserialize = tuple
+                    else:
+                        assert 0
+                underscore_mem = mem
+                camelcase_mem = underscore_to_camel_case(mem)
+                self.members.append((underscore_mem, camelcase_mem, deserialize, is_vector))
+
+    def deserialize(self, op_data):
+        attr_type = op_data.AttributeType()
+        attr = op_data.Attribute()
+        attrs = {}
+        if attr_type:
+            tosa_attrs = self.cls()
+            tosa_attrs.Init(attr.Bytes, attr.Pos)
+            for underscore_mem, camelcase_mem, deserialize, is_vector in self.members:
+                fun = camelcase_mem
+                if is_vector:
+                    fun += "AsNumpy"
+
+                attr = getattr(tosa_attrs, fun)()
+                try:
+                    attrs[underscore_mem] = deserialize(attr)
+                except TypeError:
+                    print("Warning: {0} could not read attribute '{1}'.".format(self.name, underscore_mem))
+
+        return attrs
+
+
+class QuantSerializer:
+    def __init__(self, name, members=None):
+        self.name = name
+        self.module = globals()[self.name]
+        self.cls = getattr(self.module, self.name)
+        self.members = []
+        if members is not None:
+            for mem in members:
+                deserialize = identity
+                underscore_mem = mem
+                camelcase_mem = underscore_to_camel_case(mem)
+                self.members.append((underscore_mem, camelcase_mem, deserialize))
+
+    def deserialize(self, op_data):
+        quant_info_type = op_data.QuantInfoType()
+        quant_info = op_data.QuantInfo()
+        quant = {}
+        if quant_info_type:
+            tosa_quant = self.cls()
+            tosa_quant.Init(quant_info.Bytes, quant_info.Pos)
+            for underscore_mem, camelcase_mem, deserialize in self.members:
+                attr = getattr(tosa_quant, camelcase_mem)()
+                try:
+                    quant[underscore_mem] = deserialize(attr)
+                except TypeError:
+                    print("Warning: {0} could not read quant info '{1}'.".format(self.name, underscore_mem))
+
+        return quant
+
+
+is_vec = True
+pool2d_attrs = AttrSerializer("Pool2dAttribute", (("padding", is_vec), ("kernel", is_vec), ("stride", is_vec)))
+conv2d_attrs = AttrSerializer("Conv2dAttribute", (("padding", is_vec), ("stride", is_vec), ("dilation", is_vec)))
+transpose_conv2d_attrs = AttrSerializer(
+    "TransposeConv2dAttribute", (("outpad", is_vec), ("stride", is_vec), ("dilation", is_vec), ("out_shape", is_vec))
+)
+relun_attrs = AttrSerializer("ReluNAttribute", ("max_int"))
+axis_attrs = AttrSerializer("AxisAttribute", ("axis"))
+reshape_attrs = AttrSerializer("ReshapeAttribute", (("shape", is_vec),))
+slice_attrs = AttrSerializer("SliceAttribute", (("begin", is_vec), ("size", is_vec)))
+tile_attrs = AttrSerializer("TileAttribute", (("multiplies", is_vec),))
+resize_attrs = AttrSerializer(
+    "ResizeAttribute", (("output_size", is_vec), ("stride", is_vec), ("offset", is_vec), ("shift"))
+)
+clamp_attrs = AttrSerializer("ClampAttribute", (("min_int"), ("max_int")))
+rescale_attrs = AttrSerializer(
+    "RescaleAttribute",
+    ("input_zp", "output_zp", ("multiplier", is_vec), ("shift", is_vec), "scale32", "double_round", "per_channel"),
+)
+mul_attrs = AttrSerializer("MulAttribute", ("shift"))
+ars_attrs = AttrSerializer("ArithmeticRightShiftAttribute", ("round",))
+condif_attrs = AttrSerializer("CondIfAttribute", (("then_branch"), ("else_branch")))  # TODO these are references
+while_attrs = AttrSerializer("WhileLoopAttribute", (("cond_branch"), ("body_branch")))  # TODO these are references
+
+unary_quant_info = QuantSerializer("UnaryQuantInfo", ("input_zp", "output_zp"))
+conv_quant_info = QuantSerializer("ConvQuantInfo", ("input_zp", "weight_zp"))
+matmul_quant_info = QuantSerializer("MatMulQuantInfo", ("a_zp", "b_zp"))
+pad_quant_info = QuantSerializer("PadQuantInfo", ("input_zp"))
+
+unsupported_tosa_operators = {
+    TosaOp.UNKNOWN,
+    TosaOp.ARGMAX,
+    TosaOp.CONV3D,
+    TosaOp.MATMUL,
+    TosaOp.TRANSPOSE_CONV2D,
+    TosaOp.SIGMOID,
+    TosaOp.TANH,
+    TosaOp.BITWISE_AND,
+    TosaOp.BITWISE_OR,
+    TosaOp.BITWISE_XOR,
+    TosaOp.DIV,
+    TosaOp.LOGICAL_AND,
+    TosaOp.LOGICAL_LEFT_SHIFT,
+    TosaOp.LOGICAL_RIGHT_SHIFT,
+    TosaOp.LOGICAL_OR,
+    TosaOp.LOGICAL_XOR,
+    TosaOp.MAXIMUM,
+    TosaOp.MINIMUM,
+    TosaOp.MUL,
+    TosaOp.POW,
+    TosaOp.TABLE,
+    TosaOp.ABS,
+    TosaOp.BITWISE_NOT,
+    TosaOp.CEIL,
+    TosaOp.CLZ,
+    TosaOp.EXP,
+    TosaOp.FLOOR,
+    TosaOp.LOG,
+    TosaOp.LOGICAL_NOT,
+    TosaOp.NEGATE,
+    TosaOp.RECIPROCAL,
+    TosaOp.RSQRT,
+    TosaOp.SELECT,
+    TosaOp.EQUAL,
+    TosaOp.GREATER,
+    TosaOp.GREATER_EQUAL,
+    TosaOp.REDUCE_ANY,
+    TosaOp.REDUCE_ALL,
+    TosaOp.REDUCE_MAX,
+    TosaOp.REDUCE_MIN,
+    TosaOp.REDUCE_PRODUCT,
+    TosaOp.REDUCE_SUM,
+    TosaOp.CONCAT,
+    TosaOp.PAD,
+    TosaOp.RESHAPE,
+    TosaOp.REVERSE,
+    TosaOp.SLICE,
+    TosaOp.TILE,
+    TosaOp.TRANSPOSE,
+    TosaOp.GATHER,
+    TosaOp.SCATTER,
+    TosaOp.RESIZE,
+    TosaOp.CAST,
+    TosaOp.IDENTITY,
+    TosaOp.CUSTOM,
+    TosaOp.COND_IF,
+    TosaOp.WHILE_LOOP,
+}
+
+
+TOSA_NO_INDICES = TensorIndices([], [], [])
+TOSA_IFM_INDICES = TensorIndices([0], [], [])
+# TOSA_IFM_WEIGHTS_INDICES = TensorIndices([0], [1], [])
+TOSA_IFM_WEIGHTS_BIAS_INDICES = TensorIndices([0], [1], [2])
+TOSA_IFM_IFM2_INDICES = TensorIndices([0, 1], [], [])
+# TOSA_CONV2D_BACKPROP_INDICES = TensorIndices([2], [1], [3])
+# TOSA_TRANSPOSE_CONV_INDICES = TensorIndices([0], [1], [3])
+# TOSA_CONCAT_INDICES = TensorIndices([1, 2], [], [])
+# TOSA_SPLIT_IFM_INDICES = TensorIndices([1], [], [])
+# TOSA_BLOCK_LSTM_INDICES = TensorIndices([3], [4], [])
+
+
+tosa_operator_map = {
+    # TosaOp.UNKNOWN: (),
+    # TODO TosaOp.ARGMAX: (Op.ArgMax, axis_attrs, None),
+    TosaOp.AVG_POOL2D: (Op.AvgPool, pool2d_attrs, unary_quant_info, TOSA_IFM_INDICES),
+    TosaOp.CONV2D: (Op.Conv2DBias, conv2d_attrs, conv_quant_info, TOSA_IFM_WEIGHTS_BIAS_INDICES),
+    # TODO TosaOp.CONV3D:
+    TosaOp.DEPTHWISE_CONV2D: (Op.DepthwiseConv2DBias, conv2d_attrs, conv_quant_info, TOSA_IFM_WEIGHTS_BIAS_INDICES),
+    TosaOp.FULLY_CONNECTED: (Op.FullyConnected, None, conv_quant_info, TOSA_IFM_WEIGHTS_BIAS_INDICES),
+    # TODO TosaOp.MATMUL:
+    TosaOp.MAX_POOL2D: (Op.MaxPool, pool2d_attrs, None, TOSA_IFM_INDICES),
+    # TODO TosaOp.TRANSPOSE_CONV2D: (Op.Conv2DBackpropInput, transpose_conv2d_attrs, conv_quant_info)
+    TosaOp.CLAMP: (Op.Clip, clamp_attrs, None, TOSA_IFM_INDICES),
+    TosaOp.RELUN: (Op.ReluN, relun_attrs, None, TOSA_IFM_INDICES),
+    # TODO TosaOp.SIGMOID
+    # TODO TosaOp.TANH
+    TosaOp.ADD: (Op.Add, None, None, TOSA_IFM_IFM2_INDICES),
+    TosaOp.ARITHMETIC_RIGHT_SHIFT: (Op.SHR, ars_attrs, None, TOSA_IFM_IFM2_INDICES),
+    # TODO TosaOp.BITWISE_AND
+    # TODO TosaOp.BITWISE_OR
+    # TODO TosaOp.BITWISE_XOR
+    # TODO TosaOp.DIV
+    # TODO TosaOp.LOGICAL_AND
+    # TODO TosaOp.LOGICAL_LEFT_SHIFT
+    # TODO TosaOp.LOGICAL_RIGHT_SHIFT
+    # TODO TosaOp.LOGICAL_OR
+    # TODO TosaOp.LOGICAL_XOR
+    # TODO TosaOp.MAXIMUM
+    # TODO TosaOp.MINIMUM
+    # TODO TosaOp.MUL
+    # TODO TosaOp.POW
+    TosaOp.SUB: (Op.Sub, None, None, TOSA_IFM_IFM2_INDICES),
+    # TODO TosaOp.TABLE
+    # TODO TosaOp.ABS
+    # TODO TosaOp.BITWISE_NOT
+    # TODO TosaOp.CEIL
+    # TODO TosaOp.CLZ
+    # TODO TosaOp.EXP
+    # TODO TosaOp.FLOOR
+    # TODO TosaOp.LOG
+    # TODO TosaOp.LOGICAL_NOT
+    # TODO TosaOp.NEGATE
+    # TODO TosaOp.RECIPROCAL
+    # TODO TosaOp.RSQRT
+    # TODO TosaOp.SELECT
+    # TODO TosaOp.EQUAL
+    # TODO TosaOp.GREATER
+    # TODO TosaOp.GREATER_EQUAL
+    # TODO TosaOp.REDUCE_ANY
+    # TODO TosaOp.REDUCE_ALL
+    # TODO TosaOp.REDUCE_MAX
+    # TODO TosaOp.REDUCE_MIN
+    # TODO TosaOp.REDUCE_PRODUCT
+    # TODO TosaOp.REDUCE_SUM
+    # TODO TosaOp.CONCAT
+    # TODO TosaOp.PAD
+    # TODO TosaOp.RESHAPE
+    # TODO TosaOp.REVERSE
+    # TODO TosaOp.SLICE
+    # TODO TosaOp.TILE
+    # TODO TosaOp.TRANSPOSE
+    # TODO TosaOp.GATHER
+    # TODO TosaOp.SCATTER
+    # TODO TosaOp.RESIZE
+    # TODO TosaOp.CAST
+    TosaOp.RESCALE: (Op.Rescale, rescale_attrs, None, TOSA_IFM_INDICES),
+    TosaOp.CONST: (Op.Const, None, None, TOSA_NO_INDICES),
+    # TODO TosaOp.IDENTITY
+    # TODO TosaOp.CUSTOM
+    # TODO TosaOp.COND_IF
+    # TODO TosaOp.WHILE_LOOP
+}
+
+tosa_operator_inv_map = {v[0]: (k, v[1]) for k, v in tosa_operator_map.items()}
+
+
+def tosa_type_name(builtin):
+    return next(k for k, v in vars(TosaOp).items() if v == builtin)
+
+
+# TODO will return UNKNOWN for the once that have not yet been defined in tosa_operator_map
+def optype_to_tosa_op_type(op_type):
+    if op_type in tosa_operator_inv_map:
+        return tosa_type_name(tosa_operator_inv_map[op_type][0])
+    else:
+        return TosaOp.UNKNOWN