src/uncore/debug/RBB_Shakti.c

   1 /*
   2 Copyright (c) 2013, IIT Madras
   3 All rights reserved.
   4
   5 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
   6
   7 *  Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
   8 *  Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
   9 *  Neither the name of IIT Madras  nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
  10
  11 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  12 ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  13 */
  14 #include <stdio.h>
  15 #include <arpa/inet.h>
  16 #include <errno.h>
  17 #include <fcntl.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <unistd.h>
  21 #include <stdbool.h>
  22 #include "RBB_Shakti.h"
  23
  24 int socket_fd;
  25 int client_fd;
  26 int port = 10000;
  27 char frame = 0; // frame = {NA,NA,NA,reset,request_tdo,tck,tms,tdi}
  28
  29 char accept_cxn()
  30 {
  31   client_fd = accept(socket_fd, NULL, NULL);
  32   if (client_fd == -1) {
  33     if (errno == EAGAIN) {
  34       return -1;
  35       // No client waiting to connect right now.
  36     } else {
  37       fprintf(stderr, "failed to accept on socket: %s (%d)\n", strerror(errno),
  38           errno);
  39     }
  40   } else {
  41     fcntl(client_fd, F_SETFL, O_NONBLOCK);
  42     return 1;
  43   }
  44   return -1;
  45 }
  46
  47
  48 char init1(){
  49   socket_fd = socket(AF_INET, SOCK_STREAM, 0);
  50   if (socket_fd == -1) {
  51     fprintf(stderr, "remote_bitbang failed to make socket: %s (%d)\n",
  52         strerror(errno), errno);
  53     return -1;
  54   }
  55
  56   fcntl(socket_fd, F_SETFL, O_NONBLOCK);
  57   int reuseaddr = 1;
  58   if (setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, &reuseaddr,
  59         sizeof(int)) == -1) {
  60     fprintf(stderr, "remote_bitbang failed setsockopt: %s (%d)\n",
  61         strerror(errno), errno);
  62     return -1;
  63   }
  64
  65   struct sockaddr_in addr;
  66   memset(&addr, 0, sizeof(addr));
  67   addr.sin_family = AF_INET;
  68   addr.sin_addr.s_addr = INADDR_ANY;
  69   addr.sin_port = htons(port);
  70
  71   if (bind(socket_fd, (struct sockaddr *) &addr, sizeof(addr)) == -1) {
  72     fprintf(stderr, "remote_bitbang failed to bind socket: %s (%d)\n",
  73         strerror(errno), errno);
  74     return -1;
  75   }
  76
  77   if (listen(socket_fd, 1) == -1) {
  78     fprintf(stderr, "remote_bitbang failed to listen on socket: %s (%d)\n",
  79         strerror(errno), errno);
  80     return -1;
  81   }
  82
  83   socklen_t addrlen = sizeof(addr);
  84   if (getsockname(socket_fd, (struct sockaddr *) &addr, &addrlen) == -1) {
  85     fprintf(stderr, "remote_bitbang getsockname failed: %s (%d)\n",
  86         strerror(errno), errno);
  87     return -1;
  88   }
  89
  90   printf("Listening for remote bitbang connection on port %d.\n",
  91       ntohs(addr.sin_port));
  92   fflush(stdout);
  93   printf("Waiting for OpenOCD .... \n");
  94   while (accept_cxn() != 1);
  95   return 0;
  96 }
  97
  98
  99 char decode_frame(char command){
 100 // frame = {NA,NA,NA,reset,request_tdo,tck,tms,tdi}
 101   switch (command) {
 102     case 'B': /* fprintf(stderr, "*BLINK*\n"); */ break; // not supported in spike
 103     case 'b': /* fprintf(stderr, "_______\n"); */ break; // not supported in spike
 104     case 'r': frame &= ~((char)24); frame |= 16 ; break;
 105     case '0': frame = 0; break;
 106     case '1': frame = 1; break;
 107     case '2': frame = 2; break;
 108     case '3': frame = 3; break;
 109     case '4': frame = 4; break;
 110     case '5': frame = 5; break;
 111     case '6': frame = 6; break;
 112     case '7': frame = 7; break;
 113     case 'R': frame &= ~((char)24); frame |= 8 ; break;  // push out a word with the previous state held with the read bit enabled maintain previous state and just push enable the read bit
 114     case 'Q': break; //  Not Supporting Q right now
 115     default:
 116             frame &= ~((char)24);   //fprintf(stderr, "remote_bitbang got unsupported command '%d'\n",
 117 //                  command); // essentially de assert the read bit if it was ever up;
 118   }
 119   return frame;
 120 }
 121
 122 // frame = {NA,NA,NA,reset,request_tdo,tck,tms,tdi}
 123 char get_frame(){
 124   char packet;
 125   read(client_fd,&packet, 1);
 126   //printf("%d\n",decode_frame(packet));
 127   return decode_frame(packet);
 128 }
 129
 130 void send_tdo(bool tdo){
 131   char a = (tdo)? '1' :'0' ;
 132   write(client_fd,&a,1);
 133 };
 134
 135
 136 void main(){ // Test Bench of sorts
 137   init1();
 138 /*  while(1){
 139     char fr = get_frame();
 140     if((fr & 8) == 8)send_tdo(1);
 141     if((fr & 16) == 16) printf("Reset Requested \n");
 142   }
 143 */
 144 }