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Commit 4336698a authored by Andrey Filippov's avatar Andrey Filippov
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finished initial code for ahci_fis_transmit module

parent 892ec17c
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ahci/ahci_fis_transmit.v
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......@@ -21,32 +21,32 @@
`timescale 1ns/1ps
module ahci_fis_transmit #(
parameter PREFETCH_ALWAYS = 0,
parameter READ_REG_LATENCY = 2, // 0 if reg_rdata is available with reg_re/reg_addr
parameter READ_CT_LATENCY = 2, // 0 if reg_rdata is available with reg_re/reg_addr
parameter ADDRESS_BITS = 10 // number of memory address bits - now fixed. Low half - RO/RW/RWC,RW1 (2-cycle write), 2-nd just RW (single-cycle)
)(
input hba_rst, // @posedge mclk - sync reset
input hba_rst, // @posedge mclk - when port is reset (even COMINIT)?
input mclk, // for command/status
// Command pulses to execute states
input fetch_cmd, // Enter p:FetchCmd, fetch command header (from the register memory, prefetch command FIS)
// wait for either fetch_cmd_busy == 0 or pCmdToIssue ==1 after fetch_cmd
output pCmdToIssue, // AHCI port variable
output dmaCntrZero, // DmA counter is zero (first command)
output reg fetch_cmd_busy, // does not include prefetching CT
// input fetch_ct, // fetch command table (ch_ctba[31:7] should be valid by now)
input cfis_xmit, // transmit command (wait for dma_ct_busy == 0)
input dx_transmit, // send FIS header DWORD, (just 0x46), then forward DMA data
// transmit until error, 2048DWords or pDmaXferCnt
input atapi_xmit, // tarsmit ATAPI command FIS
output reg done,
output reg busy,
input clearCmdToIssue, // From CFIS:SUCCESS
output pCmdToIssue, // AHCI port variable
// output dmaCntrZero, // DMA counter is zero - would be a duplicate to the one in receive module and dwords_sent output
output reg fetch_cmd_busy, // does not include prefetching CT
input syncesc_recv, // These two inputs interrupt transmit
input xmit_err, //
output dx_busy,
output dx_done, // single-clock dx_transmit is finished, check dx_err
output [ 1:0] dx_err, // bit 0 - syncesc_recv, 1 - xmit_err (valid @ xmit_err and later, reset by new command)
input atapi_xmit, // tarsmit ATAPI command FIS
output [15:0] ch_prdtl, // Physical region descriptor table length (in entries, 0 is 0)
output ch_c, // Clear busy upon R_OK for this FIS
output ch_b, // Built-in self test command
......@@ -56,39 +56,30 @@ module ahci_fis_transmit #(
output ch_a, // ATAPI: 1 means device should send PIO setup FIS for ATAPI command
output [4:0] ch_cfl, // length of the command FIS in DW, 0 means none. 0 and 1 - illegal,
// maximal is 16 (0x10)
// output [31:7] ch_ctba, // command table base address - use reg_rdata[31:7] - outside
output reg [11:2] dwords_sent, // number of DWORDs transmitted (up to 2048)
// register memory interface
output reg [ADDRESS_BITS-1:0] reg_addr,
output reg_re,
input [31:0] reg_rdata,
// ahci_fis_receive interface
input [31:2] xfer_cntr, // transfer counter in words for both DMA (31 bit) and PIO (lower 15 bits), updated after decr_dwc
output dma_ctba_ld, // load command table base address
output dma_ctba_ld, // load command table address from
output dma_start, // start processing command table, reset prdbc (next cycle after dma_ctba_ld, bits prdtl valid)
output dma_dev_wr, // write to device (valid at start)
input dma_ct_busy, // dma module is busy reading command table from the system memory
// issue dma_prd_start same time as dma_start if prefetch enabled, otherwise with cfis_xmit
output dma_prd_start, // at or after cmd_start - enable reading PRD/data (if any) ch_prdtl should be valid
// output cmd_abort, // try to abort a command TODO: Implement
output reg dma_prd_start, // at or after cmd_start - enable reading PRD/data (if any) ch_prdtl should be valid, twice - OK
output reg cmd_abort, // try to abort a command TODO: Implement
// reading out command table data from DMA module
output reg [ 4:0] ct_addr, // DWORD address
output ct_re, //
input [31:0] ct_data, //
// DMA (memory -> device) interface
input [31:0] dma_out, // 32-bit data from the DMA module, HBA -> device port
input dma_dav, // at least one dword is ready to be read from DMA module
......@@ -122,8 +113,12 @@ module ahci_fis_transmit #(
reg ch_p_r;
reg ch_w_r;
reg ch_a_r;
reg [4:0] ch_cfl_r;
reg [4:0] ch_cfl_out_r;
reg [4:0] ch_cmd_len_r;
reg [4:0] cfis_acmd_left_r; // number of DWORDS in CFIS or ACMD area of the command table left to be fetched from ahci_dma module BRAM
// For CFIS this register is set from ch_cmd_len_r, for ACMD - from the xfer_cntr input
// (stored in the ahci_fis_receive module)
reg [4:0] cfis_acmd_left_out_r; // Same, just with latency of the data available from the ahci_dma module
// reg [31:7] ch_ctba_r;
reg [READ_REG_LATENCY:0] reg_re_r;
wire reg_re_w; // combined conditions to read register memory
......@@ -135,17 +130,14 @@ module ahci_fis_transmit #(
reg chead_bsy; // busy reading command header
reg chead_bsy_re; // busy sending read command header
reg pCmdToIssue_r;
wire clearCmdToIssue; // TODO: assign - clear pCmdToIssue
// reg fetch_ct_r;
reg cfis_xmit_pend_r; //
reg cfis_xmit_start_r;
reg cfis_xmit_busy_r; //
reg dmaCntrZero_r; // first command
// wire start_sync_escape_w = cfis_xmit && ch_r_r; - no, it should be instead of a ct_fetch
// TODO: Start FIS transmit when all FIS is in FIFO or data and >half(too slow, need minimum to be able to send wait primitive) or less?
reg acfis_xmit_pend_r; //
reg acfis_xmit_start_r;
reg acfis_xmit_busy_r; //
// reg anc_fis_r; // This is ATAPI FIS, not Command FIS
wire cfis_xmit_start_w = (dx_transmit || cfis_xmit_pend_r) && !dma_ct_busy && !fetch_cmd_busy; // dma_ct_busy no gaps with fetch_cmd_busy
wire cfis_xmit_end;
wire acfis_xmit_start_w = (cfis_xmit || atapi_xmit || acfis_xmit_pend_r) && !dma_ct_busy && !fetch_cmd_busy; // dma_ct_busy no gaps with fetch_cmd_busy
wire acfis_xmit_end = ct_stb && fis_dw_last;
wire ct_re_w; // next cycle will be ct_re;
reg [READ_CT_LATENCY:0] ct_re_r;
......@@ -159,8 +151,9 @@ module ahci_fis_transmit #(
wire dx_dma_last_w; // sending last adat word
reg dx_busy_r;
reg [ 1:0] dx_err_r;
reg dx_done_r;
wire any_cmd_start = fetch_cmd || cfis_xmit || dx_transmit || atapi_xmit;
wire done_w = dx_dma_last_w || ((|dx_err_r) && dx_busy_r) || chead_done_w || acfis_xmit_end; // done on last transmit or error
assign todev_valid = todev_full_r;
assign dma_re = dma_re_w;
......@@ -173,27 +166,23 @@ module ahci_fis_transmit #(
assign ch_p = ch_p_r;
assign ch_w = ch_w_r;
assign ch_a = ch_a_r;
assign ch_cfl = ch_cfl_r;
// assign ch_ctba = ch_ctba_r[31:7];
assign ch_cfl = cfis_acmd_left_r;
assign reg_re_w = fetch_cmd || chead_bsy_re;
assign dma_ctba_ld = fetch_chead_stb_r[2];
assign dma_start = fetch_chead_stb_r[3]; // next cycle after dma_ctba_ld
assign pCmdToIssue = pCmdToIssue_r;
assign dmaCntrZero = dmaCntrZero_r;
// assign dmaCntrZero = dmaCntrZero_r;
assign ct_re = ct_re_r[0];
assign fis_data_valid = ct_stb; // no wait write to output register 'todev_data', ct_re_r[0] is throttled according to FIFO room availability
assign ct_re_w = todev_ready && ((ch_cfl_r[4:1] != 0) || (ch_cfl_r[0] && !ct_re_r[0])); // Later add more sources
assign fis_dw_last = (ch_cfl_out_r == 1);
assign ct_re_w = todev_ready && ((cfis_acmd_left_r[4:1] != 0) || (cfis_acmd_left_r[0] && !ct_re_r[0])); // Later add more sources
assign fis_dw_last = (cfis_acmd_left_out_r == 1);
assign fis_data_type = {fis_dw_last, (write_or_w && dx_fis_pend_r) | (fis_dw_first && ct_stb)};
assign fis_data_out = ({32{dx_fis_pend_r}} & DATA_FIS) | ({32{ct_stb}} & ct_data) ;
assign dx_dma_last_w = dma_en_r && dma_re_w && (dx_dwords_left[11:2] == 1);
assign dx_busy = dx_busy_r;
assign dx_done = dx_done_r;
assign dx_err = dx_err_r;
assign dma_dev_wr = ch_w_r;
always @ (posedge mclk) begin
// Mutliplex between DMA and FIS output to the output routed to transmit FIFO
......@@ -207,7 +196,9 @@ module ahci_fis_transmit #(
if (hba_rst) todev_type <= 3; // invalid? - no, now first and last word in command FIS (impossible?)
else if (write_or_w) todev_type <= dma_en_r? {dx_dma_last_w, 1'b0} : fis_data_type;
if (hba_rst) fetch_chead_r <= 0;
// Read 3 DWORDs from the command header
if (hba_rst) fetch_chead_r <= 0; // running 1
else if (fetch_cmd) fetch_chead_r <= 1;
else fetch_chead_r <= fetch_chead_r << 1;
......@@ -223,7 +214,7 @@ module ahci_fis_transmit #(
else if (fetch_cmd) chead_bsy_re <= 1;
else if (fetch_chead_r[1]) chead_bsy_re <= 0; // read 3 dwords
if (hba_rst) reg_re_r <= 0;
if (hba_rst) reg_re_r <= 0; // [0] -> reg_re output
else if (reg_re_w) reg_re_r <= 1;
else reg_re_r <= reg_re_r << 1;
......@@ -239,7 +230,7 @@ module ahci_fis_transmit #(
ch_p_r <= reg_rdata[ 7];
ch_w_r <= reg_rdata[ 6];
ch_a_r <= reg_rdata[ 5];
ch_cfl_r <= reg_rdata[ 4: 0];
ch_cmd_len_r<= reg_rdata[ 4: 0];
end
if (hba_rst) pCmdToIssue_r <= 0;
......@@ -250,39 +241,41 @@ module ahci_fis_transmit #(
else if (fetch_cmd) fetch_cmd_busy <= 1;
else if (dma_start) fetch_cmd_busy <= 0;
// fetch and send command fis
if (hba_rst || cfis_xmit_start_w) cfis_xmit_pend_r <= 0;
else if (cfis_xmit) cfis_xmit_pend_r <= 1;
//CFIS/ATAPI common
cfis_xmit_start_r <= !hba_rst && cfis_xmit_start_w;
// if (hba_rst || cfis_xmit) anc_fis_r <= 0;
// else if (atapi_xmit) anc_fis_r <= 1;
if (hba_rst) cfis_xmit_busy_r <= 0;
else if (cfis_xmit_start_r) cfis_xmit_busy_r <= 1;
else if (cfis_xmit_end) cfis_xmit_busy_r <= 0;
// fetch and send command/atapi FIS
if (hba_rst || acfis_xmit_start_w) acfis_xmit_pend_r <= 0;
else if (cfis_xmit || atapi_xmit) acfis_xmit_pend_r <= 1;
if (fetch_chead_stb_r[0]) ch_cfl_r <= reg_rdata[ 4: 0]; // Will assume that there is room for ...
else if (cfis_xmit_busy_r && ct_re_r[0]) ch_cfl_r <= ch_cfl_r - 1;
acfis_xmit_start_r <= !hba_rst && acfis_xmit_start_w;
// Counting CFIS dwords sent to TL
if (cfis_xmit_start_w) ch_cfl_out_r <= ch_cfl_r;
else if (ct_stb) ch_cfl_out_r <= ch_cfl_out_r - 1;
if (hba_rst) acfis_xmit_busy_r <= 0;
else if (acfis_xmit_start_r) acfis_xmit_busy_r <= 1;
else if (acfis_xmit_end) acfis_xmit_busy_r <= 0;
if (cfis_xmit) cfis_acmd_left_r <= ch_cmd_len_r[ 4: 0]; // Will assume that there is room for ...
else if (atapi_xmit) cfis_acmd_left_r <= (|xfer_cntr[31:4]) ? 5'h4 : {3'b0,xfer_cntr[3:2]};
else if (acfis_xmit_busy_r && ct_re_r[0]) cfis_acmd_left_r <= cfis_acmd_left_r - 1;
// Counting CFIS/ATAPI FIS dwords sent to TL
if (acfis_xmit_start_r) cfis_acmd_left_out_r <= cfis_acmd_left_r;
else if (ct_stb) cfis_acmd_left_out_r <= cfis_acmd_left_out_r - 1;
ct_re_r <= {ct_re_r[READ_CT_LATENCY-1:0],ct_re_w};
if (cfis_xmit) ct_addr <= 0;
else if (ch_cfl_r[0]) ct_addr <= ct_addr + 1;
else if (atapi_xmit) ct_addr <= 'h10; // start of ATAPI area
else if (cfis_acmd_left_r[0]) ct_addr <= ct_addr + 1;
// first/last dword in FIS
if (!cfis_xmit_busy_r) fis_dw_first <= 1;
if (!acfis_xmit_busy_r) fis_dw_first <= 1;
else if (ct_stb) fis_dw_first <= 0;
// TODO: Implement ATAPI command, other FIS to send?
//TODO: update xfer length, prdtl (only after R_OK) - yes, do it outside
// Send Data FIS TODO: abort on errors, and busy (or done) output
// input syncesc_recv, // These two inputs interrupt transmit
// input xmit_err, //
//TODO: update xfer length, prdtl (only after R_OK)?
if (dx_transmit) dx_dwords_left[11:2] <= (|xfer_cntr[31:11])?10'h200:{1'b0,xfer_cntr[10:2]};
else if (dma_re_w) dx_dwords_left[11:2] <= dx_dwords_left[11:2] - 1;
......@@ -306,15 +299,21 @@ module ahci_fis_transmit #(
if (hba_rst) dx_busy_r <= 0;
else if (dx_transmit) dx_busy_r <= 1;
else if (dx_dma_last_w || (|dx_err_r)) dx_busy_r <= 0;
// done on last transmit or error
if (hba_rst) dx_done_r <= 0;
else dx_done_r <= dx_dma_last_w || ((|dx_err_r) && dx_busy_r);
// TODO: Make commmon done for all commands?
dma_prd_start <= (dma_start && (PREFETCH_ALWAYS || ch_p_r || !ch_w_r)) || // device read may prefetch just prd addresses
(dx_fis_pend_r && write_or_w); // enable PRD read now (if it was not already done)
end
if (hba_rst) done <= 0;
else done <= done_w;
if (hba_rst) busy <= 0;
else if (any_cmd_start) busy <= 1;
else if (done_w) busy <= 0;
cmd_abort <= done_w && (|dx_err_r);
end
endmodule
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