anlogic: support BRAM mapping

Anlogic FPGAs all have two kinds of BRAMs, one is 9bit*1K when being
true dual port (or 18bit*512 when simple dual port), the other is
16bit*2K.

Supports mapping of these two kinds of BRAMs. 9Kbit BRAM in SDP mode and
32Kbit BRAM with 8bit width are not support yet.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>

6 files changed, 269 insertions, 1 deletions

diff --git a/techlibs/anlogic/.gitignore b/techlibs/anlogic/.gitignore
new file mode 100644
index 000000000..d127107db
--- /dev/null
+++ b/techlibs/anlogic/.gitignore
@@ -0,0 +1,2 @@
+brams_init.mk
+brams_init_*.vh
diff --git a/techlibs/anlogic/Makefile.inc b/techlibs/anlogic/Makefile.inc
index 2d8d65e2e..79519c645 100644
--- a/techlibs/anlogic/Makefile.inc
+++ b/techlibs/anlogic/Makefile.inc
@@ -3,6 +3,22 @@ OBJS += techlibs/anlogic/synth_anlogic.o
 OBJS += techlibs/anlogic/anlogic_eqn.o
 OBJS += techlibs/anlogic/anlogic_fixcarry.o
 
+GENFILES += techlibs/anlogic/brams_init_16.vh
+GENFILES += techlibs/anlogic/brams_init_9.vh
+GENFILES += techlibs/anlogic/brams_init_8.vh
+
+EXTRA_OBJS += techlibs/anlogic/brams_init.mk
+.SECONDARY: techlibs/anlogic/brams_init.mk
+
+techlibs/anlogic/brams_init.mk: techlibs/anlogic/brams_init.py
+	$(Q) mkdir -p techlibs/anlogic
+	$(P) $(PYTHON_EXECUTABLE) $<
+	$(Q) touch $@
+
+techlibs/anlogic/brams_init_16.vh: techlibs/anlogic/brams_init.mk
+techlibs/anlogic/brams_init_9.vh: techlibs/anlogic/brams_init.mk
+techlibs/anlogic/brams_init_8.vh: techlibs/anlogic/brams_init.mk
+
 $(eval $(call add_share_file,share/anlogic,techlibs/anlogic/cells_map.v))
 $(eval $(call add_share_file,share/anlogic,techlibs/anlogic/arith_map.v))
 $(eval $(call add_share_file,share/anlogic,techlibs/anlogic/cells_sim.v))
@@ -10,3 +26,9 @@ $(eval $(call add_share_file,share/anlogic,techlibs/anlogic/eagle_bb.v))
 $(eval $(call add_share_file,share/anlogic,techlibs/anlogic/lutrams.txt))
 $(eval $(call add_share_file,share/anlogic,techlibs/anlogic/lutrams_map.v))
 $(eval $(call add_share_file,share/anlogic,techlibs/anlogic/lutram_init_16x4.vh))
+$(eval $(call add_share_file,share/anlogic,techlibs/anlogic/brams.txt))
+$(eval $(call add_share_file,share/anlogic,techlibs/anlogic/brams_map.v))
+
+$(eval $(call add_gen_share_file,share/anlogic,techlibs/anlogic/brams_init_16.vh))
+$(eval $(call add_gen_share_file,share/anlogic,techlibs/anlogic/brams_init_9.vh))
+$(eval $(call add_gen_share_file,share/anlogic,techlibs/anlogic/brams_init_8.vh))
diff --git a/techlibs/anlogic/brams.txt b/techlibs/anlogic/brams.txt
new file mode 100644
index 000000000..817d7d6f4
--- /dev/null
+++ b/techlibs/anlogic/brams.txt
@@ -0,0 +1,45 @@
+bram $__ANLOGIC_BRAM9K_TDP
+  init 1
+  abits  13 @a13d1
+  dbits  1  @a13d1
+  abits  12 @a12d2
+  dbits  2  @a12d2
+  abits  11 @a11d4
+  dbits  4  @a11d4
+  abits  10 @a10d8
+  dbits  8  @a10d8
+  abits  10 @a10d9
+  dbits  9  @a10d9
+  groups 2
+  ports  1 1
+  wrmode 0 1
+  enable 1 1
+  transp 2 0
+  clocks 2 3
+  clkpol 2 3
+endbram
+
+bram $__ANLOGIC_BRAM32K
+  init 1
+  abits  11
+  dbits  16
+  groups 2
+  ports  1 1
+  wrmode 0 1
+  enable 1 2
+  transp 0 0
+  clocks 2 3
+  clkpol 2 3
+endbram
+
+match $__ANLOGIC_BRAM32K
+  min efficiency 30
+  shuffle_enable B
+  make_transp
+  or_next_if_better
+endmatch
+
+match $__ANLOGIC_BRAM9K_TDP
+  min efficiency 5
+  make_transp
+endmatch
diff --git a/techlibs/anlogic/brams_init.py b/techlibs/anlogic/brams_init.py
new file mode 100644
index 000000000..8dda0d33e
--- /dev/null
+++ b/techlibs/anlogic/brams_init.py
@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+
+with open("techlibs/anlogic/brams_init_9.vh", "w") as f:
+    for i in range(4):
+        init_snippets = [" INIT[%3d*9+8]" % (k+256*i,) for k in range(255, -1, -1)]
+        for k in range(4, 256, 4):
+            init_snippets[k] = "\n           " + init_snippets[k]
+        print(".INITP_%02X({%s})," % (i, ",".join(init_snippets)), file=f)
+    for i in range(32):
+        init_snippets = [" INIT[%3d*9 +: 8]" % (k+32*i,) for k in range(31, -1, -1)]
+        for k in range(4, 32, 4):
+            init_snippets[k] = "\n          " + init_snippets[k]
+        print(".INIT_%02X({%s})," % (i, ",".join(init_snippets)), file=f)
+
+with open("techlibs/anlogic/brams_init_8.vh", "w") as f:
+    for i in range(32):
+        print(".INIT_%02X(INIT[%3d*256 +: 256])," % (i, i), file=f)
+
+with open("techlibs/anlogic/brams_init_16.vh", "w") as f:
+    for i in range(128):
+        print(".INIT_%02X(INIT[%3d*256 +: 256])," % (i, i), file=f)
diff --git a/techlibs/anlogic/brams_map.v b/techlibs/anlogic/brams_map.v
new file mode 100644
index 000000000..ee02b6d7c
--- /dev/null
+++ b/techlibs/anlogic/brams_map.v
@@ -0,0 +1,162 @@
+module \$__ANLOGIC_BRAM9K_TDP (CLK2, CLK3, A1ADDR, A1DATA, A1EN, B1ADDR, B1DATA, B1EN);
+	parameter CFG_ABITS = 10;
+	parameter CFG_DBITS = 9;
+
+	parameter CLKPOL2 = 1;
+	parameter CLKPOL3 = 1;
+	parameter [9215:0] INIT = 9216'bx;
+	parameter TRANSP2 = 0;
+
+	input CLK2;
+	input CLK3;
+
+	input [CFG_ABITS-1:0] A1ADDR;
+	output [CFG_DBITS-1:0] A1DATA;
+	input A1EN;
+
+	input [CFG_ABITS-1:0] B1ADDR;
+	input [CFG_DBITS-1:0] B1DATA;
+	input B1EN;
+
+	localparam CLKAMUX = CLKPOL2 ? "SIG" : "INV";
+	localparam CLKBMUX = CLKPOL3 ? "SIG" : "INV";
+
+	localparam WRITEMODE_B = TRANSP2 ? "WRITETHROUGH" : "READBEFOREWRITE";
+
+	localparam DATA_WIDTH = CFG_DBITS == 1 ? "1" :
+				(CFG_DBITS == 2 ? "2" :
+				 (CFG_DBITS <= 4 ? "4" : "9"));
+
+	localparam APADBITS = $clog2(CFG_DBITS == 9 ? 8 : CFG_DBITS);
+
+	wire [12:0] addra;
+	wire [12:0] addrb;
+
+	assign addra[12:APADBITS] = A1ADDR;
+	assign addrb[12:APADBITS] = B1ADDR;
+
+	wire [8:0] doa;
+	wire [8:0] dib;
+
+	assign A1DATA[CFG_DBITS-1:0] = doa;
+	assign dib[CFG_DBITS-1:0] = B1DATA;
+
+	generate if (CFG_DBITS == 9) begin
+		EG_PHY_BRAM #(
+			.MODE("DP8K"),
+			.DATA_WIDTH_A(DATA_WIDTH),
+			.DATA_WIDTH_B(DATA_WIDTH),
+			.READBACK("OFF"),
+			.REGMODE_A("NOREG"),
+			.REGMODE_B("NOREG"),
+			.WRITEMODE_A("READBEFOREWRITE"),
+			.WRITEMODE_B(WRITEMODE_B),
+			.RESETMODE("ASYNC"),
+			.CEAMUX("SIG"), .CEBMUX("SIG"),
+			.OCEAMUX("1"), .OCEBMUX("1"),
+			.RSTAMUX("0"), .RSTBMUX("0"),
+			.CLKAMUX(CLKAMUX),
+			.CLKBMUX(CLKBMUX),
+			.WEAMUX("0"), .WEBMUX("SIG"),
+			.CSA0("1"), .CSA1("1"),
+			.CSA2("1"), .CSB0("1"),
+			.CSB1("1"), .CSB2("1"),
+			`include "brams_init_9.vh"
+		) _TECHMAP_REPLACE_ (
+			.doa(doa), .dib(dib),
+			.addra(addra), .addrb(addrb),
+			.clka(CLK2), .clkb(CLK3),
+			.cea(A1EN), .ceb(B1EN),
+			.ocea(1'b1), .oceb(1'b1),
+			.rsta(1'b0), .rstb(1'b0),
+			.wea(1'b0), .web(B1EN),
+			.csa(3'b111), .csb(3'b111)
+		);
+	end else begin
+		EG_PHY_BRAM #(
+			.MODE("DP8K"),
+			.DATA_WIDTH_A(DATA_WIDTH),
+			.DATA_WIDTH_B(DATA_WIDTH),
+			.READBACK("OFF"),
+			.REGMODE_A("NOREG"),
+			.REGMODE_B("NOREG"),
+			.WRITEMODE_A("READBEFOREWRITE"),
+			.WRITEMODE_B(WRITEMODE_B),
+			.RESETMODE("ASYNC"),
+			.CEAMUX("SIG"), .CEBMUX("SIG"),
+			.OCEAMUX("1"), .OCEBMUX("1"),
+			.RSTAMUX("0"), .RSTBMUX("0"),
+			.CLKAMUX(CLKAMUX),
+			.CLKBMUX(CLKBMUX),
+			.WEAMUX("0"), .WEBMUX("SIG"),
+			.CSA0("1"), .CSA1("1"),
+			.CSA2("1"), .CSB0("1"),
+			.CSB1("1"), .CSB2("1"),
+			`include "brams_init_8.vh"
+		) _TECHMAP_REPLACE_ (
+			.doa(doa), .dib(dib),
+			.addra(addra), .addrb(addrb),
+			.clka(CLK2), .clkb(CLK3),
+			.cea(A1EN), .ceb(B1EN),
+			.ocea(1'b1), .oceb(1'b1),
+			.rsta(1'b0), .rstb(1'b0),
+			.wea(1'b0), .web(B1EN),
+			.csa(3'b111), .csb(3'b111)
+		);
+	end endgenerate
+endmodule
+
+module \$__ANLOGIC_BRAM32K (CLK2, CLK3, A1ADDR, A1DATA, A1EN, B1ADDR, B1DATA, B1EN);
+	parameter CFG_ABITS = 11;
+	parameter CFG_DBITS = 16;
+
+	parameter CLKPOL2 = 1;
+	parameter CLKPOL3 = 1;
+	parameter [32767:0] INIT = 32768'bx;
+
+	input CLK2;
+	input CLK3;
+
+	input [CFG_ABITS-1:0] A1ADDR;
+	output [CFG_DBITS-1:0] A1DATA;
+	input A1EN;
+
+	input [CFG_ABITS-1:0] B1ADDR;
+	input [CFG_DBITS-1:0] B1DATA;
+	input [1:0] B1EN;
+
+	localparam CLKAMUX = CLKPOL2 ? "SIG" : "INV";
+	localparam CLKBMUX = CLKPOL3 ? "SIG" : "INV";
+
+	wire byteweb = B1EN[1] ^ B1EN[0];
+	wire byteb = B1EN[1];
+
+	EG_PHY_BRAM32K #(
+		.MODE("DP16K"),
+		.DATA_WIDTH_A("16"),
+		.DATA_WIDTH_B("16"),
+		.REGMODE_A("NOREG"),
+		.REGMODE_B("NOREG"),
+		.WRITEMODE_A("NORMAL"),
+		.WRITEMODE_B("NORMAL"),
+		.SRMODE("ASYNC"),
+		.CSAMUX("SIG"), .CSBMUX("SIG"),
+		.OCEAMUX("1"), .OCEBMUX("1"),
+		.RSTAMUX("0"), .RSTBMUX("0"),
+		.CLKAMUX(CLKAMUX),
+		.CLKBMUX(CLKBMUX),
+		.WEAMUX("0"), .WEBMUX("SIG"),
+		.READBACK("OFF"),
+		`include "brams_init_16.vh"
+	) _TECHMAP_REPLACE_ (
+		.doa(A1DATA), .dib(B1DATA),
+		.addra(A1ADDR), .addrb(B1ADDR),
+		.bytea(1'b0), .byteb(byteb),
+		.bytewea(1'b0), .byteweb(byteweb),
+		.csa(A1EN), .csb(|B1EN),
+		.wea(1'b0), .web(|B1EN),
+		.clka(CLK2), .clkb(CLK3),
+		.rsta(1'b0), .rstb(1'b0),
+		.ocea(1'b1), .oceb(1'b1)
+	);
+endmodule
diff --git a/techlibs/anlogic/synth_anlogic.cc b/techlibs/anlogic/synth_anlogic.cc
index 039cae00e..5da14c26b 100644
--- a/techlibs/anlogic/synth_anlogic.cc
+++ b/techlibs/anlogic/synth_anlogic.cc
@@ -63,6 +63,9 @@ struct SynthAnlogicPass : public ScriptPass
 		log("    -nolutram\n");
 		log("        do not use EG_LOGIC_DRAM16X4 cells in output netlist\n");
 		log("\n");
+		log("    -nobram\n");
+		log("        do not use EG_PHY_BRAM or EG_PHY_BRAM32K cells in output netlist\n");
+		log("\n");
 		log("\n");
 		log("The following commands are executed by this synthesis command:\n");
 		help_script();
@@ -70,7 +73,7 @@ struct SynthAnlogicPass : public ScriptPass
 	}
 
 	string top_opt, edif_file, json_file;
-	bool flatten, retime, nolutram;
+	bool flatten, retime, nolutram, nobram;
 
 	void clear_flags() override
 	{
@@ -80,6 +83,7 @@ struct SynthAnlogicPass : public ScriptPass
 		flatten = true;
 		retime = false;
 		nolutram = false;
+		nobram = false;
 	}
 
 	void execute(std::vector<std::string> args, RTLIL::Design *design) override
@@ -118,6 +122,10 @@ struct SynthAnlogicPass : public ScriptPass
 				nolutram = true;
 				continue;
 			}
+			if (args[argidx] == "-nobram") {
+				nobram = true;
+				continue;
+			}
 			if (args[argidx] == "-retime") {
 				retime = true;
 				continue;
@@ -158,6 +166,14 @@ struct SynthAnlogicPass : public ScriptPass
 			run("synth -run coarse");
 		}
 
+		if (!nobram && check_label("map_bram", "(skip if -nobram)"))
+		{
+			run("memory_bram -rules +/anlogic/brams.txt");
+			run("techmap -map +/anlogic/brams_map.v");
+			run("setundef -zero -params t:EG_PHY_BRAM");
+			run("setundef -zero -params t:EG_PHY_BRAM32K");
+		}
+
 		if (!nolutram && check_label("map_lutram", "(skip if -nolutram)"))
 		{
 			run("memory_bram -rules +/anlogic/lutrams.txt");