162 lines
4.2 KiB
Python
162 lines
4.2 KiB
Python
from functools import partial
|
|
|
|
from migen.fhdl.structure import *
|
|
from migen.fhdl.convtools import *
|
|
|
|
def _printsig(ns, s):
|
|
if s.bv.signed:
|
|
n = "signed "
|
|
else:
|
|
n = ""
|
|
if s.bv.width > 1:
|
|
n += "[" + str(s.bv.width-1) + ":0] "
|
|
n += ns.get_name(s)
|
|
return n
|
|
|
|
def _printexpr(ns, node):
|
|
if isinstance(node, Constant):
|
|
if node.n >= 0:
|
|
return str(node.bv) + str(node.n)
|
|
else:
|
|
return "-" + str(node.bv) + str(-self.n)
|
|
elif isinstance(node, Signal):
|
|
return ns.get_name(node)
|
|
elif isinstance(node, Operator):
|
|
arity = len(node.operands)
|
|
if arity == 1:
|
|
r = node.op + _printexpr(ns, node.operands[0])
|
|
elif arity == 2:
|
|
r = _printexpr(ns, node.operands[0]) + " " + node.op + " " + _printexpr(ns, node.operands[1])
|
|
else:
|
|
raise TypeError
|
|
return "(" + r + ")"
|
|
elif isinstance(node, Slice):
|
|
if node.start + 1 == node.stop:
|
|
sr = "[" + str(node.start) + "]"
|
|
else:
|
|
sr = "[" + str(node.stop-1) + ":" + str(node.start) + "]"
|
|
return _printexpr(ns, node.value) + sr
|
|
elif isinstance(node, Cat):
|
|
l = list(map(partial(_printexpr, ns), node.l))
|
|
l.reverse()
|
|
return "{" + ", ".join(l) + "}"
|
|
elif isinstance(node, Replicate):
|
|
return "{" + str(node.n) + "{" + _printexpr(ns, node.v) + "}}"
|
|
else:
|
|
raise TypeError
|
|
|
|
def _printnode(ns, level, node):
|
|
if isinstance(node, Assign):
|
|
if is_variable(node.l):
|
|
assignment = " = "
|
|
else:
|
|
assignment = " <= "
|
|
return "\t"*level + _printexpr(ns, node.l) + assignment + _printexpr(ns, node.r) + ";\n"
|
|
elif isinstance(node, StatementList):
|
|
return "".join(list(map(partial(_printnode, ns, level), node.l)))
|
|
elif isinstance(node, If):
|
|
r = "\t"*level + "if (" + _printexpr(ns, node.cond) + ") begin\n"
|
|
r += _printnode(ns, level + 1, node.t)
|
|
if node.f.l:
|
|
r += "\t"*level + "end else begin\n"
|
|
r += _printnode(ns, level + 1, node.f)
|
|
r += "\t"*level + "end\n"
|
|
return r
|
|
elif isinstance(node, Case):
|
|
r = "\t"*level + "case (" + _printexpr(ns, node.test) + ")\n"
|
|
for case in node.cases:
|
|
r += "\t"*(level + 1) + _printexpr(ns, case[0]) + ": begin\n"
|
|
r += _printnode(ns, level + 2, case[1])
|
|
r += "\t"*(level + 1) + "end\n"
|
|
if node.default.l:
|
|
r += "\t"*(level + 1) + "default: begin\n"
|
|
r += _printnode(ns, level + 2, node.default)
|
|
r += "\t"*(level + 1) + "end\n"
|
|
r += "\t"*level + "endcase\n"
|
|
return r
|
|
else:
|
|
raise TypeError
|
|
|
|
def _printinstances(ns, i, clk, rst):
|
|
r = ""
|
|
for x in i:
|
|
r += x.of + " "
|
|
if x.parameters:
|
|
r += "#(\n"
|
|
firstp = True
|
|
for p in x.parameters:
|
|
if not firstp:
|
|
r += ",\n"
|
|
firstp = False
|
|
r += "\t." + p[0] + "("
|
|
if isinstance(p[1], int) or isinstance(p[1], Constant):
|
|
r += str(p[1])
|
|
elif isinstance(p[1], str):
|
|
r += "\"" + p[1] + "\""
|
|
else:
|
|
raise TypeError
|
|
r += ")"
|
|
r += "\n) "
|
|
r += ns.get_name(x)
|
|
if x.parameters: r += " "
|
|
r += "(\n"
|
|
ports = list(x.ins.items()) + list(x.outs.items())
|
|
if x.clkport:
|
|
ports.append((x.clkport, clk))
|
|
if x.rstport:
|
|
ports.append((x.rstport, rst))
|
|
firstp = True
|
|
for p in ports:
|
|
if not firstp:
|
|
r += ",\n"
|
|
firstp = False
|
|
r += "\t." + p[0] + "(" + ns.get_name(p[1]) + ")"
|
|
if not firstp:
|
|
r += "\n"
|
|
r += ");\n\n"
|
|
return r
|
|
|
|
def Convert(f, ios=set(), name="top", clkname="sys_clk", rstname="sys_rst", ns=None):
|
|
if ns is None: ns = Namespace()
|
|
|
|
clks = Signal(name=clkname)
|
|
rsts = Signal(name=rstname)
|
|
|
|
ios |= f.pads
|
|
|
|
sigs = list_signals(f)
|
|
targets = list_targets(f)
|
|
instouts = list_inst_outs(f)
|
|
|
|
r = "/* Machine-generated using Migen */\n"
|
|
r += "module " + name + "(\n"
|
|
r += "\tinput " + ns.get_name(clks) + ",\n"
|
|
r += "\tinput " + ns.get_name(rsts)
|
|
for sig in ios:
|
|
if sig in targets:
|
|
r += ",\n\toutput reg " + _printsig(ns, sig)
|
|
elif sig in instouts:
|
|
r += ",\n\toutput " + _printsig(ns, sig)
|
|
else:
|
|
r += ",\n\tinput " + _printsig(ns, sig)
|
|
r += "\n);\n\n"
|
|
for sig in sigs - ios:
|
|
if sig in instouts:
|
|
r += "wire " + _printsig(ns, sig) + ";\n"
|
|
else:
|
|
r += "reg " + _printsig(ns, sig) + ";\n"
|
|
r += "\n"
|
|
|
|
if f.comb.l:
|
|
r += "always @(*) begin\n"
|
|
r += _printnode(ns, 1, f.comb)
|
|
r += "end\n\n"
|
|
if f.sync.l:
|
|
r += "always @(posedge " + ns.get_name(clks) + ") begin\n"
|
|
r += _printnode(ns, 1, insert_reset(rsts, f.sync))
|
|
r += "end\n\n"
|
|
r += _printinstances(ns, f.instances, clks, rsts)
|
|
|
|
r += "endmodule\n"
|
|
|
|
return r |