118 lines
2.7 KiB
Python
118 lines
2.7 KiB
Python
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from migen.fhdl.std import *
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from migen.genlib.record import *
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from migen.flow.actor import EndpointDescription, Sink, Source
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from misoclib.com.litepcie.common import *
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# constants
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fmt_type_dict = {
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"mem_rd32": 0b0000000,
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"mem_wr32": 0b1000000,
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"mem_rd64": 0b0100000,
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"mem_wr64": 0b1100000,
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"cpld": 0b1001010,
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"cpl": 0b0001010
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}
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cpl_dict = {
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"sc": 0b000,
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"ur": 0b001,
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"crs": 0b010,
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"ca": 0b011
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}
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max_request_size = 512
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# headers
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class HField():
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def __init__(self, word, offset, width):
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self.word = word
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self.offset = offset
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self.width = width
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tlp_header_w = 128
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tlp_common_header = {
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"fmt": HField(0, 29, 2),
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"type": HField(0, 24, 5),
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}
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tlp_request_header = {
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"fmt": HField(0, 29, 2),
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"type": HField(0, 24, 5),
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"tc": HField(0, 20, 3),
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"td": HField(0, 15, 1),
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"ep": HField(0, 14, 1),
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"attr": HField(0, 12, 2),
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"length": HField(0, 0, 10),
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"requester_id": HField(1, 16, 16),
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"tag": HField(1, 8, 8),
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"last_be": HField(1, 4, 4),
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"first_be": HField(1, 0, 4),
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"address": HField(2, 2, 30),
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}
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tlp_completion_header = {
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"fmt": HField(0, 29, 2),
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"type": HField(0, 24, 5),
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"tc": HField(0, 20, 3),
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"td": HField(0, 15, 1),
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"ep": HField(0, 14, 1),
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"attr": HField(0, 12, 2),
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"length": HField(0, 0, 10),
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"completer_id": HField(1, 16, 16),
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"status": HField(1, 13, 3),
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"bcm": HField(1, 12, 1),
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"byte_count": HField(1, 0, 12),
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"requester_id": HField(2, 16, 16),
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"tag": HField(2, 8, 8),
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"lower_address": HField(2, 0, 7),
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}
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# layouts
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def _layout_from_header(header):
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_layout = []
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for k, v in sorted(header.items()):
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_layout.append((k, v.width))
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return _layout
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def tlp_raw_layout(dw):
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layout = [
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("header", tlp_header_w),
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("dat", dw),
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("be", dw//8)
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]
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return EndpointDescription(layout, packetized=True)
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def tlp_common_layout(dw):
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layout = _layout_from_header(tlp_common_header) + [
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("dat", dw),
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("be", dw//8)
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]
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return EndpointDescription(layout, packetized=True)
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def tlp_request_layout(dw):
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layout = _layout_from_header(tlp_request_header) + [
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("dat", dw),
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("be", dw//8)
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]
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return EndpointDescription(layout, packetized=True)
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def tlp_completion_layout(dw):
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layout = _layout_from_header(tlp_completion_header) + [
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("dat", dw),
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("be", dw//8)
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]
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return EndpointDescription(layout, packetized=True)
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