199 lines
12 KiB
Systemverilog
199 lines
12 KiB
Systemverilog
// SPDX-License-Identifier: Apache-2.0
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// Copyright 2019 Western Digital Corporation or its affiliates.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//********************************************************************************
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// $Id$
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//
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//
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// Owner:
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// Function: DCCM for LSU pipe
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// Comments: Single ported memory
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//
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//
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// DC1 -> DC2 -> DC3 -> DC4 (Commit)
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//
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// //********************************************************************************
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module lsu_dccm_ctl
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import swerv_types::*;
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(
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input logic lsu_freeze_c2_dc2_clk, // clocks
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input logic lsu_freeze_c2_dc3_clk,
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input logic lsu_dccm_c1_dc3_clk,
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input logic lsu_pic_c1_dc3_clken,
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input logic rst_l,
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input logic clk,
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input logic lsu_freeze_dc3, // freze
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input lsu_pkt_t lsu_pkt_dc3, // lsu packets
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input lsu_pkt_t lsu_pkt_dc1,
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input logic addr_in_dccm_dc1, // address maps to dccm
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input logic addr_in_pic_dc1, // address maps to pic
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input logic addr_in_pic_dc3, // address maps to pic
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input logic [31:0] lsu_addr_dc1, // starting byte address for loads
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input logic [`RV_DCCM_BITS-1:0] end_addr_dc1, // last address used to calculate unaligned
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input logic [`RV_DCCM_BITS-1:0] lsu_addr_dc3, // starting byte address for loads
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input logic stbuf_reqvld_any, // write enable
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input logic stbuf_addr_in_pic_any, // stbuf is going to pic
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input logic [`RV_LSU_SB_BITS-1:0] stbuf_addr_any, // stbuf address (aligned)
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input logic [`RV_DCCM_DATA_WIDTH-1:0] stbuf_data_any, // the read out from stbuf
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input logic [`RV_DCCM_ECC_WIDTH-1:0] stbuf_ecc_any, // the encoded data with ECC bits
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input logic [`RV_DCCM_DATA_WIDTH-1:0] stbuf_fwddata_hi_dc3, // stbuf fowarding to load
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input logic [`RV_DCCM_DATA_WIDTH-1:0] stbuf_fwddata_lo_dc3, // stbuf fowarding to load
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input logic [`RV_DCCM_BYTE_WIDTH-1:0] stbuf_fwdbyteen_hi_dc3, // stbuf fowarding to load
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input logic [`RV_DCCM_BYTE_WIDTH-1:0] stbuf_fwdbyteen_lo_dc3, // stbuf fowarding to load
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input logic lsu_double_ecc_error_dc3, // lsu has a DED
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input logic [`RV_DCCM_DATA_WIDTH-1:0] store_ecc_datafn_hi_dc3, // store data
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input logic [`RV_DCCM_DATA_WIDTH-1:0] store_ecc_datafn_lo_dc3, // store data
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output logic [`RV_DCCM_DATA_WIDTH-1:0] dccm_data_hi_dc3, // data from the dccm
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output logic [`RV_DCCM_DATA_WIDTH-1:0] dccm_data_lo_dc3, // data from the dccm
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output logic [`RV_DCCM_ECC_WIDTH-1:0] dccm_data_ecc_hi_dc3, // data from the dccm + ecc
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output logic [`RV_DCCM_ECC_WIDTH-1:0] dccm_data_ecc_lo_dc3,
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output logic [`RV_DCCM_DATA_WIDTH-1:0] lsu_ld_data_dc3, // right justified, ie load byte will have data at 7:0
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output logic [`RV_DCCM_DATA_WIDTH-1:0] lsu_ld_data_corr_dc3, // right justified, ie load byte will have data at 7:0
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output logic [31:0] picm_mask_data_dc3, // pic data to stbuf
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output logic lsu_stbuf_commit_any, // stbuf wins the dccm port or is to pic
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output logic lsu_dccm_rden_dc3, // dccm read
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output logic dccm_dma_rvalid, // dccm serviving the dma load
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output logic dccm_dma_ecc_error, // DMA load had ecc error
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output logic [63:0] dccm_dma_rdata, // dccm data to dma request
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// DCCM ports
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output logic dccm_wren, // dccm interface -- write
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output logic dccm_rden, // dccm interface -- write
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output logic [`RV_DCCM_BITS-1:0] dccm_wr_addr, // dccm interface -- wr addr
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output logic [`RV_DCCM_BITS-1:0] dccm_rd_addr_lo, // dccm interface -- read address for lo bank
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output logic [`RV_DCCM_BITS-1:0] dccm_rd_addr_hi, // dccm interface -- read address for hi bank
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output logic [`RV_DCCM_FDATA_WIDTH-1:0] dccm_wr_data, // dccm write data
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input logic [`RV_DCCM_FDATA_WIDTH-1:0] dccm_rd_data_lo, // dccm read data back from the dccm
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input logic [`RV_DCCM_FDATA_WIDTH-1:0] dccm_rd_data_hi, // dccm read data back from the dccm
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// PIC ports
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output logic picm_wren, // write to pic
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output logic picm_rden, // read to pick
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output logic picm_mken, // write to pic need a mask
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output logic [31:0] picm_addr, // address for pic access - shared between reads and write
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output logic [31:0] picm_wr_data, // write data
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input logic [31:0] picm_rd_data, // read data
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input logic scan_mode // scan mode
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);
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`include "global.h"
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`ifdef RV_DCCM_ENABLE
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localparam DCCM_ENABLE = 1'b1;
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`else
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localparam DCCM_ENABLE = 1'b0;
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`endif
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localparam DCCM_WIDTH_BITS = $clog2(DCCM_BYTE_WIDTH);
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localparam PIC_BITS =`RV_PIC_BITS;
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logic lsu_dccm_rden_dc1, lsu_dccm_rden_dc2;
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logic [DCCM_DATA_WIDTH-1:0] dccm_data_hi_dc2, dccm_data_lo_dc2;
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logic [DCCM_ECC_WIDTH-1:0] dccm_data_ecc_hi_dc2, dccm_data_ecc_lo_dc2;
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logic [63:0] dccm_dout_dc3, dccm_corr_dout_dc3;
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logic [63:0] stbuf_fwddata_dc3;
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logic [7:0] stbuf_fwdbyteen_dc3;
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logic [63:0] lsu_rdata_dc3, lsu_rdata_corr_dc3;
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logic [63:0] picm_rd_data_dc3;
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logic [31:0] picm_rd_data_lo_dc3;
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logic [63:32] lsu_ld_data_dc3_nc, lsu_ld_data_corr_dc3_nc;
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assign dccm_dma_rvalid = lsu_pkt_dc3.valid & lsu_pkt_dc3.load & lsu_pkt_dc3.dma;
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assign dccm_dma_ecc_error = lsu_double_ecc_error_dc3;
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assign dccm_dma_rdata[63:0] = lsu_pkt_dc3.dword ? lsu_rdata_corr_dc3[63:0] : {2{lsu_rdata_corr_dc3[31:0]}}; // Need to replicate the data for non-dw access since ecc correction is done only in lower word
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assign {lsu_ld_data_dc3_nc[63:32], lsu_ld_data_dc3[31:0]} = lsu_rdata_dc3[63:0] >> 8*lsu_addr_dc3[1:0];
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assign {lsu_ld_data_corr_dc3_nc[63:32], lsu_ld_data_corr_dc3[31:0]} = lsu_rdata_corr_dc3[63:0] >> 8*lsu_addr_dc3[1:0];
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assign dccm_dout_dc3[63:0] = {dccm_data_hi_dc3[DCCM_DATA_WIDTH-1:0], dccm_data_lo_dc3[DCCM_DATA_WIDTH-1:0]};
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assign dccm_corr_dout_dc3[63:0] = {store_ecc_datafn_hi_dc3[DCCM_DATA_WIDTH-1:0], store_ecc_datafn_lo_dc3[DCCM_DATA_WIDTH-1:0]};
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assign stbuf_fwddata_dc3[63:0] = {stbuf_fwddata_hi_dc3[DCCM_DATA_WIDTH-1:0], stbuf_fwddata_lo_dc3[DCCM_DATA_WIDTH-1:0]};
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assign stbuf_fwdbyteen_dc3[7:0] = {stbuf_fwdbyteen_hi_dc3[DCCM_BYTE_WIDTH-1:0], stbuf_fwdbyteen_lo_dc3[DCCM_BYTE_WIDTH-1:0]};
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for (genvar i=0; i<8; i++) begin: GenLoop
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assign lsu_rdata_dc3[(8*i)+7:8*i] = stbuf_fwdbyteen_dc3[i] ? stbuf_fwddata_dc3[(8*i)+7:8*i] :
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(addr_in_pic_dc3 ? picm_rd_data_dc3[(8*i)+7:8*i] : dccm_dout_dc3[(8*i)+7:8*i]);
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assign lsu_rdata_corr_dc3[(8*i)+7:8*i] = stbuf_fwdbyteen_dc3[i] ? stbuf_fwddata_dc3[(8*i)+7:8*i] :
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(addr_in_pic_dc3 ? picm_rd_data_dc3[(8*i)+7:8*i] : dccm_corr_dout_dc3[(8*i)+7:8*i]);
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end
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assign lsu_stbuf_commit_any = stbuf_reqvld_any & ~lsu_freeze_dc3 & (
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(~(lsu_dccm_rden_dc1 | picm_rden | picm_mken)) |
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((picm_rden | picm_mken) & ~stbuf_addr_in_pic_any) |
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(lsu_dccm_rden_dc1 & (stbuf_addr_in_pic_any | (~((stbuf_addr_any[DCCM_WIDTH_BITS+:DCCM_BANK_BITS] == lsu_addr_dc1[DCCM_WIDTH_BITS+:DCCM_BANK_BITS]) |
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(stbuf_addr_any[DCCM_WIDTH_BITS+:DCCM_BANK_BITS] == end_addr_dc1[DCCM_WIDTH_BITS+:DCCM_BANK_BITS]))))));
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// No need to read for aligned word/dword stores since ECC will come by new data completely
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assign lsu_dccm_rden_dc1 = lsu_pkt_dc1.valid & (lsu_pkt_dc1.load | (lsu_pkt_dc1.store & (~(lsu_pkt_dc1.word | lsu_pkt_dc1.dword) | (lsu_addr_dc1[1:0] != 2'b0)))) & addr_in_dccm_dc1;
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// DCCM inputs
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assign dccm_wren = lsu_stbuf_commit_any & ~stbuf_addr_in_pic_any;
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assign dccm_rden = lsu_dccm_rden_dc1 & addr_in_dccm_dc1;
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assign dccm_wr_addr[DCCM_BITS-1:0] = stbuf_addr_any[DCCM_BITS-1:0];
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assign dccm_rd_addr_lo[DCCM_BITS-1:0] = lsu_addr_dc1[DCCM_BITS-1:0];
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assign dccm_rd_addr_hi[DCCM_BITS-1:0] = end_addr_dc1[DCCM_BITS-1:0];
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assign dccm_wr_data[DCCM_FDATA_WIDTH-1:0] = {stbuf_ecc_any[DCCM_ECC_WIDTH-1:0],stbuf_data_any[DCCM_DATA_WIDTH-1:0]};
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// DCCM outputs
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assign dccm_data_lo_dc2[DCCM_DATA_WIDTH-1:0] = dccm_rd_data_lo[DCCM_DATA_WIDTH-1:0];
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assign dccm_data_hi_dc2[DCCM_DATA_WIDTH-1:0] = dccm_rd_data_hi[DCCM_DATA_WIDTH-1:0];
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assign dccm_data_ecc_lo_dc2[DCCM_ECC_WIDTH-1:0] = dccm_rd_data_lo[DCCM_FDATA_WIDTH-1:DCCM_DATA_WIDTH];
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assign dccm_data_ecc_hi_dc2[DCCM_ECC_WIDTH-1:0] = dccm_rd_data_hi[DCCM_FDATA_WIDTH-1:DCCM_DATA_WIDTH];
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// PIC signals. PIC ignores the lower 2 bits of address since PIC memory registers are 32-bits
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assign picm_wren = lsu_stbuf_commit_any & stbuf_addr_in_pic_any;
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assign picm_rden = lsu_pkt_dc1.valid & lsu_pkt_dc1.load & addr_in_pic_dc1;
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assign picm_mken = lsu_pkt_dc1.valid & lsu_pkt_dc1.store & addr_in_pic_dc1; // Get the mask for stores
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assign picm_addr[31:0] = (picm_rden | picm_mken) ? (`RV_PIC_BASE_ADDR | {17'b0,lsu_addr_dc1[14:0]}) : (`RV_PIC_BASE_ADDR | {{32-PIC_BITS{1'b0}},stbuf_addr_any[`RV_PIC_BITS-1:0]});
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//assign picm_addr[31:0] = (picm_rden | picm_mken) ? {`RV_PIC_REGION,`RV_PIC_OFFSET,3'b0,lsu_addr_dc1[14:0]} : {`RV_PIC_REGION,`RV_PIC_OFFSET,{18-PIC_BITS{1'b0}},stbuf_addr_any[`RV_PIC_BITS-1:0]};
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assign picm_wr_data[31:0] = stbuf_data_any[31:0];
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// Flops
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assign picm_mask_data_dc3[31:0] = picm_rd_data_lo_dc3[31:0];
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assign picm_rd_data_dc3[63:0] = {picm_rd_data_lo_dc3[31:0], picm_rd_data_lo_dc3[31:0]} ;
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rvdffe #(32) picm_data_ff (.*, .din(picm_rd_data[31:0]), .dout(picm_rd_data_lo_dc3[31:0]), .en(lsu_pic_c1_dc3_clken));
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if (DCCM_ENABLE == 1) begin: Gen_dccm_enable
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rvdff #(1) dccm_rden_dc2ff (.*, .din(lsu_dccm_rden_dc1), .dout(lsu_dccm_rden_dc2), .clk(lsu_freeze_c2_dc2_clk));
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rvdff #(1) dccm_rden_dc3ff (.*, .din(lsu_dccm_rden_dc2), .dout(lsu_dccm_rden_dc3), .clk(lsu_freeze_c2_dc3_clk));
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rvdff #(DCCM_DATA_WIDTH) dccm_data_hi_ff (.*, .din(dccm_data_hi_dc2[DCCM_DATA_WIDTH-1:0]), .dout(dccm_data_hi_dc3[DCCM_DATA_WIDTH-1:0]), .clk(lsu_dccm_c1_dc3_clk));
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rvdff #(DCCM_DATA_WIDTH) dccm_data_lo_ff (.*, .din(dccm_data_lo_dc2[DCCM_DATA_WIDTH-1:0]), .dout(dccm_data_lo_dc3[DCCM_DATA_WIDTH-1:0]), .clk(lsu_dccm_c1_dc3_clk));
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rvdff #(DCCM_ECC_WIDTH) dccm_data_ecc_hi_ff (.*, .din(dccm_data_ecc_hi_dc2[DCCM_ECC_WIDTH-1:0]), .dout(dccm_data_ecc_hi_dc3[DCCM_ECC_WIDTH-1:0]), .clk(lsu_dccm_c1_dc3_clk));
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rvdff #(DCCM_ECC_WIDTH) dccm_data_ecc_lo_ff (.*, .din(dccm_data_ecc_lo_dc2[DCCM_ECC_WIDTH-1:0]), .dout(dccm_data_ecc_lo_dc3[DCCM_ECC_WIDTH-1:0]), .clk(lsu_dccm_c1_dc3_clk));
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end else begin: Gen_dccm_disable
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assign lsu_dccm_rden_dc2 = '0;
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assign lsu_dccm_rden_dc3 = '0;
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assign dccm_data_hi_dc3[DCCM_DATA_WIDTH-1:0] = '0;
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assign dccm_data_lo_dc3[DCCM_DATA_WIDTH-1:0] = '0;
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assign dccm_data_ecc_hi_dc3[DCCM_ECC_WIDTH-1:0] = '0;
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assign dccm_data_ecc_lo_dc3[DCCM_ECC_WIDTH-1:0] = '0;
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end
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endmodule
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