i3c_controller: arbitration da, bcr lookup

Better arbitration handling, check if the received DA is known, and if
the IBI requester will send the MDB after the request (BCR[2] == 1).

Signed-off-by: Jorge Marques <jorge.marques@analog.com>

Author: gastmaier

docs/regmap/adi_regmap_i3c_controller.txt

@@ -117,18 +117,21 @@ FIELD
 IBI_ALMOST_FULL
 RW
 If set to 0 the IBI_ALMOST_FULL interrupt is masked.
+ENDFIELD
 
 FIELD
 [5] 0x00
 CMDR_PENDING
 RW
 If set to 0 the CMDR_PENDING interrupt is masked.
+ENDFIELD
 
 FIELD
 [6] 0x00
 IBI_PENDING
 RW
 If set to 0 the IBI_PENDING interrupt is masked.
+ENDFIELD
 
 ############################################################################################
 ############################################################################################
@@ -276,6 +279,27 @@ RO
 ENDFIELD
 
 
+FIELD
+[27:24] 0x??
+CMDR_FIFO_ERROR
+RO
+If an error occurred during the transfer.
+ENDFIELD
+
+FIELD
+[19:8] 0x??
+CMDR_FIFO_BUFFER_LENGTH
+RO
+Unsigned 12-bits transferred payload length.
+ENDFIELD
+
+FIELD
+[7:0] 0x??
+CMDR_FIFO_SYNC
+RO
+Command synchronization.
+ENDFIELD
+
 ############################################################################################
 ############################################################################################
 
@@ -337,27 +361,24 @@ IBI_FIFO
 ENDREG
 
 FIELD
-[31:24] 0x??
-IBI_FIFO_BYTE_3
-RO
-ENDFIELD
-
-FIELD
-[23:16] 0x??
-IBI_FIFO_BYTE_2
+[23:17] 0x??
+IBI_FIFO_DA
 RO
+IBI Dynamic address.
 ENDFIELD
 
 FIELD
 [15:8] 0x??
-IBI_FIFO_BYTE_1
+IBI_FIFO_MDB
 RO
+IBI MDB, if the peripheral's BCR[2] is Low, the field is ignored.
 ENDFIELD
 
 FIELD
 [7:0] 0x??
-IBI_FIFO_BYTE_0
+IBI_FIFO_SYNC
 RO
+Synchronization number.
 ENDFIELD
 
 ############################################################################################
@@ -571,6 +592,9 @@ The Controller, index 0, is set to HIGH when a DA is written to DEV_CHAR_0_0,
 while the others peripherals are set HIGH when the peripherals actually
 receives the DA during the DAA.
 The state can also be overwritten to explicit attach device (e.g. has static addr).
+A slot cannot be recycled, when the device is detached, it still keeps its slot in
+case it is attached again, effectively, only its IBIs are rejectedin the detached
+state.
 ENDFIELD
 
 FIELD

library/i3c_controller/i3c_controller_core/i3c_controller_bit_mod.v

@@ -55,9 +55,9 @@ module i3c_controller_bit_mod (
   // 3:  1.56MHz
   input [1:0] scl_pp_sg, // SCL Push-pull speed grade
 
-  output reg rx,
+  output rx,
   output reg rx_raw,
-  output reg rx_valid,
+  output rx_valid,
 
 
   // Bus drive signals
@@ -131,14 +131,12 @@ module i3c_controller_bit_mod (
 
   always @(posedge clk) begin
     scl_high_reg <= scl_high;
-    rx_valid  <= 1'b0;
     sdo <= sdo_w;
-    rx_raw <= sdi;
-    if (~scl_high_reg & scl_high) begin
-      rx <= sdi; // Multi-cycle-path worst-case: 4 clks (12.5MHz, half-bit ack)
-      rx_valid <= 1'b1;
-    end
+    rx_raw <= sdi === 1'b0 ? 1'b0 : 1'b1;
   end
+  // Multi-cycle-path worst-case: 4 clks (12.5MHz, half-bit ack)
+  assign rx = rx_raw;
+  assign rx_valid = ~scl_high_reg & scl_high;
 
   assign sdo_w = sm == `MOD_BIT_CMD_START_   ? (scl_high ? ~count[pp_sg+1] : 1'b1) :
                  sm == `MOD_BIT_CMD_STOP_    ? (scl_high ?  count[pp_sg+1] : 1'b0) :

library/i3c_controller/i3c_controller_core/i3c_controller_core.v

@@ -119,11 +119,14 @@ module i3c_controller_core #(
   wire cmdw_rx_valid;
   wire [7:0] cmdw_rx;
 
+  wire arbitration_valid;
+  wire ibi_bcr_2;
   wire ibi_requested;
   wire ibi_requested_auto;
   wire ibi_tick;
   wire [6:0] ibi_da;
   wire [7:0] ibi_mdb;
+  wire ibi_da_attached;
 
   wire [31:0] pid_bcr_dcr;
   wire pid_bcr_dcr_tick;
@@ -164,8 +167,12 @@ module i3c_controller_core #(
     .cmdw_rx(cmdw_rx),
     .rx_raw(rx_raw),
     .cmd_nop(cmd_nop),
+    .arbitration_valid(arbitration_valid),
+    .ibi_bcr_2(ibi_bcr_2),
     .ibi_requested(ibi_requested),
     .ibi_requested_auto(ibi_requested_auto),
+    .ibi_da(ibi_da),
+    .ibi_da_attached(ibi_da_attached),
     .pid_bcr_dcr_tick(pid_bcr_dcr_tick),
     .pid_bcr_dcr(pid_bcr_dcr),
     .rmap_ibi_config(rmap_ibi_config),
@@ -193,10 +200,13 @@ module i3c_controller_core #(
     .cmd_ready(cmd_ready),
     .rx(rx),
     .rx_valid(rx_valid),
+    .arbitration_valid(arbitration_valid),
+    .ibi_bcr_2(ibi_bcr_2),
     .ibi_requested(ibi_requested),
     .ibi_requested_auto(ibi_requested_auto),
     .ibi_tick(ibi_tick),
     .ibi_da(ibi_da),
+    .ibi_da_attached(ibi_da_attached),
     .ibi_mdb(ibi_mdb),
     .pid_bcr_dcr_tick(pid_bcr_dcr_tick),
     .pid_bcr_dcr(pid_bcr_dcr),