src/soc/fu/div/pipeline.py

   1 from nmutil.singlepipe import ControlBase
   2 from nmutil.pipemodbase import PipeModBaseChain
   3 from soc.fu.alu.input_stage import ALUInputStage
   4 from soc.fu.alu.output_stage import ALUOutputStage
   5 from soc.fu.div.setup_stage import DivSetupStage
   6 from soc.fu.div.core_stages import DivCoreSetupStage, DivCoreCalculateStage, DivCoreFinalStage
   7 from soc.fu.div.output_stage import DivOutputStage
   8
   9
  10 class DivStagesStart(PipeModBaseChain):
  11     def get_chain(self):
  12         alu_input = ALUInputStage(self.pspec)
  13         div_setup = DivSetupStage(self.pspec)
  14         core_setup = DivCoreSetupStage(self.pspec)
  15         return [alu_input, div_setup, core_setup]
  16
  17
  18 class DivStagesMiddle(PipeModBaseChain):
  19     def __init__(self, pspec, stage_start_index, stage_end_index):
  20         self.stage_start_index = stage_start_index
  21         self.stage_end_index = stage_end_index
  22         super().__init__(pspec)
  23
  24     def get_chain(self):
  25         stages = []
  26         for index in range(self.stage_start_index, self.stage_end_index):
  27             stages.append(DivCoreCalculateStage(self.pspec, index))
  28         return stages
  29
  30
  31 class DivStagesEnd(PipeModBaseChain):
  32     def get_chain(self):
  33         core_final = DivCoreFinalStage(self.pspec)
  34         div_out = DivOutputStage(self.pspec)
  35         alu_out = ALUOutputStage(self.pspec)
  36         return [core_final, div_out, alu_out]
  37
  38
  39 class DivPipe(ControlBase):
  40     def __init__(self, pspec, compute_steps_per_stage=2):
  41         ControlBase.__init__(self)
  42         self.pipe_start = DivStagesStart(pspec)
  43         compute_steps = pspec.core_config.n_stages
  44         self.pipe_middles = []
  45         for start in range(0, compute_steps, compute_steps_per_stage):
  46             end = min(start + compute_steps_per_stage, compute_steps)
  47             self.pipe_middles.append(DivStagesMiddle(pspec, start, end))
  48         self.pipe_end = DivStagesEnd(pspec)
  49         self._eqs = self.connect([self.pipe_start,
  50                                   *self.pipe_middles,
  51                                   self.pipe_end])
  52
  53     def elaborate(self, platform):
  54         m = ControlBase.elaborate(self, platform)
  55         m.submodules.pipe_start = self.pipe_start
  56         for i in self.pipe_middles:
  57             name = f"pipe_{i.stage_start_index}_to_{i.stage_end_index}"
  58             setattr(m.submodules, name, i)
  59         m.submodules.pipe_end = self.pipe_end
  60         m.d.comb += self._eqs
  61         return m