diff options
Diffstat (limited to 'rtl/gfx/gfx_sp_fetch.sv')
| -rw-r--r-- | rtl/gfx/gfx_sp_fetch.sv | 224 |
1 files changed, 0 insertions, 224 deletions
diff --git a/rtl/gfx/gfx_sp_fetch.sv b/rtl/gfx/gfx_sp_fetch.sv deleted file mode 100644 index 23fb20e..0000000 --- a/rtl/gfx/gfx_sp_fetch.sv +++ /dev/null @@ -1,224 +0,0 @@ -`include "gfx/gfx_defs.sv" - -module gfx_sp_fetch -( - input logic clk, - rst_n, - - input logic fetch_waitrequest, - fetch_readdatavalid, - input vram_word fetch_readdata, - output vram_addr fetch_address, - output logic fetch_read, - - input logic program_start, - input cmd_insn_ptr program_header_base, - input cmd_word program_header_size, - output logic running, - - input logic batch_end, - output vram_insn_addr batch_base, - output logic batch_start, - output cmd_word batch_length, - - input logic ready, - output logic valid, - output insn_word insn, - output logic clear_lanes -); - - localparam ENTRY_SIZE = 4; - - logic break_loop, entry_end, fifo_down_safe, fifo_empty, fifo_put, - header_continue, insn_read, insn_readdatavalid, insn_waitrequest; - - cmd_word header_count; - insn_word code_length, code_read_ptr, code_fetch_ptr, insn_readdata, entry_data[ENTRY_SIZE]; - vram_insn_addr code_base, insn_address, header_ptr; - logic[$clog2(ENTRY_SIZE - 1):0] entry_fetch_count, entry_read_count; - - enum int unsigned - { - IDLE, - HEADER, - LOOP, - FLUSH - } state; - - struct packed - { - insn_word insn; - logic clear_lanes; - } fifo_in, fifo_out; - - assign insn = fifo_out.insn; - assign clear_lanes = fifo_out.clear_lanes; - - assign entry_end = entry_read_count == ENTRY_SIZE - 1; - assign header_continue = header_count != 0; - assign break_loop = batch_end && (!insn_read || !insn_waitrequest); - - function vram_insn_addr base_from_word(insn_word in); - base_from_word = in[`GFX_INSN_SUBWORD_BITS +: $bits(vram_insn_addr)]; - endfunction - - assign code_base = base_from_word(entry_data[0]); - assign batch_base = base_from_word(entry_data[2]); - assign code_length = entry_data[1]; - assign batch_length = entry_data[3]; - - gfx_sp_widener #(.WIDTH($bits(vram_insn_addr))) insn_bus - ( - .wide_read(insn_read), - .wide_address(insn_address), - .wide_readdata(insn_readdata), - .wide_waitrequest(insn_waitrequest), - .wide_readdatavalid(insn_readdatavalid), - .word_read(fetch_read), - .word_address(fetch_address), - .word_readdata(fetch_readdata), - .word_waitrequest(fetch_waitrequest), - .word_readdatavalid(fetch_readdatavalid), - .* - ); - - gfx_fifo #(.WIDTH($bits(fifo_in)), .DEPTH(`GFX_FETCH_FIFO_DEPTH)) insn_fifo - ( - .in(fifo_in), - .out(fifo_out), - .in_ready(), - .in_valid(fifo_put), - .out_ready(ready), - .out_valid(valid), - .* - ); - - gfx_fifo_overflow #(.DEPTH(`GFX_FETCH_FIFO_DEPTH)) overflow - ( - .down(insn_read && !insn_waitrequest), - .empty(fifo_empty), - .down_safe(fifo_down_safe), - .out_ready(ready), - .out_valid(valid), - .* - ); - - always_ff @(posedge clk or negedge rst_n) - if (!rst_n) begin - state <= IDLE; - running <= 0; - fifo_put <= 0; - insn_read <= 0; - batch_start <= 0; - end else unique case (state) - IDLE: - if (program_start) begin - state <= HEADER; - running <= 1; - insn_read <= 1; - end - - HEADER: begin - if (insn_read && !insn_waitrequest) - insn_read <= entry_fetch_count != ENTRY_SIZE - 1; - - if (insn_readdatavalid && entry_end) begin - state <= LOOP; - insn_read <= 1; - batch_start <= 1; - end - end - - LOOP: begin - fifo_put <= 0; - batch_start <= 0; - - if (!insn_read || !insn_waitrequest) - insn_read <= fifo_down_safe; - - if (break_loop) begin - state <= FLUSH; - insn_read <= 0; - end - - if (insn_readdatavalid) - fifo_put <= 1; - end - - FLUSH: begin - fifo_put <= 0; - - if (fifo_empty) begin - state <= header_continue ? HEADER : IDLE; - running <= header_continue; - insn_read <= header_continue; - end - end - endcase - - always_ff @(posedge clk) - unique case (state) - IDLE: - if (program_start) begin - header_ptr <= program_header_base.addr; - header_count <= program_header_size; - insn_address <= program_header_base.addr; - - entry_read_count <= 0; - entry_fetch_count <= 0; - end - - HEADER: begin - code_read_ptr <= 0; - code_fetch_ptr <= 0; - - if (!insn_waitrequest) begin - insn_address <= insn_address + 1; - entry_fetch_count <= entry_fetch_count + 1; - end - - if (insn_read && !insn_waitrequest) - header_ptr <= header_ptr + 1; - - if (insn_readdatavalid) begin - entry_read_count <= entry_read_count + 1; - - for (integer i = 0; i < ENTRY_SIZE - 1; ++i) - entry_data[i] <= entry_data[i + 1]; - - entry_data[ENTRY_SIZE - 1] <= insn_readdata; - - if (entry_end) - insn_address <= base_from_word(entry_data[1]); - end - end - - LOOP: begin - if (insn_read && !insn_waitrequest) begin - insn_address <= insn_address + 1; - code_fetch_ptr <= code_fetch_ptr + 1; - - if (code_fetch_ptr == code_length) begin - insn_address <= code_base; - code_fetch_ptr <= 0; - end - end - - if (insn_readdatavalid) begin - fifo_in.insn <= insn_readdata; - fifo_in.clear_lanes <= code_read_ptr == 0; - - code_read_ptr <= code_read_ptr + 1; - if (code_read_ptr == code_length) - code_read_ptr <= 0; - end - end - - FLUSH: - if (fifo_empty) begin - header_count <= header_count - 1; - insn_address <= header_ptr; - end - endcase - -endmodule |