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rocket-chip/csrc/remote_bitbang.cc
Megan Wachs e82328336e Add in a SimJTAG to connect to OpenOCD's remote-bitbang interface.
This is simpler than JTAGVPI and is supported better by Verilor.
It is also the same thing Spike uses.
2018-01-05 16:02:52 -08:00

197 lines
4.8 KiB
C++

// See LICENSE.Berkeley for license details.
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <algorithm>
#include <cassert>
#include <cstdio>
#include <cstdlib>
#include "remote_bitbang.h"
/////////// remote_bitbang_t
remote_bitbang_t::remote_bitbang_t(uint16_t port) :
socket_fd(0),
client_fd(0),
recv_start(0),
recv_end(0)
{
socket_fd = socket(AF_INET, SOCK_STREAM, 0);
if (socket_fd == -1) {
fprintf(stderr, "remote_bitbang failed to make socket: %s (%d)\n",
strerror(errno), errno);
abort();
}
fcntl(socket_fd, F_SETFL, O_NONBLOCK);
int reuseaddr = 1;
if (setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, &reuseaddr,
sizeof(int)) == -1) {
fprintf(stderr, "remote_bitbang failed setsockopt: %s (%d)\n",
strerror(errno), errno);
abort();
}
struct sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = INADDR_ANY;
addr.sin_port = htons(port);
if (bind(socket_fd, (struct sockaddr *) &addr, sizeof(addr)) == -1) {
fprintf(stderr, "remote_bitbang failed to bind socket: %s (%d)\n",
strerror(errno), errno);
abort();
}
if (listen(socket_fd, 1) == -1) {
fprintf(stderr, "remote_bitbang failed to listen on socket: %s (%d)\n",
strerror(errno), errno);
abort();
}
socklen_t addrlen = sizeof(addr);
if (getsockname(socket_fd, (struct sockaddr *) &addr, &addrlen) == -1) {
fprintf(stderr, "remote_bitbang getsockname failed: %s (%d)\n",
strerror(errno), errno);
abort();
}
tck = 1;
tms = 1;
tdi = 1;
trstn = 1;
quit = 0;
printf("Listening on port %d\n",
ntohs(addr.sin_port));
fflush(stdout);
}
void remote_bitbang_t::accept()
{
fprintf(stderr,"Attempting to accept client socket\n");
client_fd = ::accept(socket_fd, NULL, NULL);
if (client_fd == -1) {
if (errno == EAGAIN) {
// No client waiting to connect right now.
fprintf(stderr, "Not Accepted: Received EAGAIN error\n");
} else {
fprintf(stderr, "failed to accept on socket: %s (%d)\n", strerror(errno),
errno);
abort();
}
} else {
fcntl(client_fd, F_SETFL, O_NONBLOCK);
fprintf(stderr, "Accepted successfully.");
}
}
void remote_bitbang_t::tick(
unsigned char * jtag_tck,
unsigned char * jtag_tms,
unsigned char * jtag_tdi,
unsigned char * jtag_trstn,
unsigned char jtag_tdo
)
{
if (client_fd > 0) {
tdo = jtag_tdo;
execute_command();
} else {
this->accept();
}
* jtag_tck = tck;
* jtag_tms = tms;
* jtag_tdi = tdi;
* jtag_trstn = trstn;
}
void remote_bitbang_t::reset(){
//trstn = 0;
}
void remote_bitbang_t::set_pins(char _tck, char _tms, char _tdi){
tck = _tck;
tms = _tms;
tdi = _tdi;
}
void remote_bitbang_t::execute_command()
{
char command;
ssize_t num_read = read(client_fd, &command, sizeof(command));
if (num_read == -1) {
if (errno == EAGAIN) {
// We'll try again the next call.
fprintf(stderr, "Received no command. Will try again on the next call\n");
return;
} else {
fprintf(stderr, "remote_bitbang failed to read on socket: %s (%d)\n",
strerror(errno), errno);
abort();
}
}
if (num_read == 0) {
fprintf(stderr, "No Command Received.\n");
return;
}
fprintf(stderr, "Received a command %c\n", command);
int dosend = 0;
char tosend = '?';
switch (command) {
case 'B': /* fprintf(stderr, "*BLINK*\n"); */ break;
case 'b': /* fprintf(stderr, "_______\n"); */ break;
case 'r': reset(); break; // This is wrong. 'r' has other bits that indicated TRST and SRST.
case '0': set_pins(0, 0, 0); break;
case '1': set_pins(0, 0, 1); break;
case '2': set_pins(0, 1, 0); break;
case '3': set_pins(0, 1, 1); break;
case '4': set_pins(1, 0, 0); break;
case '5': set_pins(1, 0, 1); break;
case '6': set_pins(1, 1, 0); break;
case '7': set_pins(1, 1, 1); break;
case 'R': dosend = 1; tosend = tdo ? '1' : '0'; break;
case 'Q': quit = 1; break;
default:
fprintf(stderr, "remote_bitbang got unsupported command '%c'\n",
command);
}
if (dosend){
while (1) {
ssize_t bytes = write(client_fd, &tosend, sizeof(tosend));
if (bytes == -1) {
fprintf(stderr, "failed to write to socket: %s (%d)\n", strerror(errno), errno);
abort();
}
if (bytes > 0) {
break;
}
}
}
if (quit) {
// The remote disconnected.
fprintf(stderr, "Remote end disconnected\n");
close(client_fd);
client_fd = 0;
}
}