4 * Copyright (C) 2013 Franck Jullien, <elec4fun@gmail.com>
6 * See file CREDITS for list of people who contributed to this
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
25 #include <jtag/interface.h>
26 #ifdef HAVE_ARPA_INET_H
27 #include <arpa/inet.h>
30 #define NO_TAP_SHIFT 0
33 #define SERVER_ADDRESS "127.0.0.1"
34 #define SERVER_PORT 5555
36 #define XFERT_MAX_SIZE 512
40 #define CMD_SCAN_CHAIN 2
41 #define CMD_SCAN_CHAIN_FLIP_TMS 3
42 #define CMD_STOP_SIMU 4
44 int server_port = SERVER_PORT;
47 struct sockaddr_in serv_addr;
51 unsigned char buffer_out[XFERT_MAX_SIZE];
52 unsigned char buffer_in[XFERT_MAX_SIZE];
57 static int jtag_vpi_send_cmd(struct vpi_cmd *vpi)
59 int retval = write_socket(sockfd, vpi, sizeof(struct vpi_cmd));
66 static int jtag_vpi_receive_cmd(struct vpi_cmd *vpi)
68 int retval = read_socket(sockfd, vpi, sizeof(struct vpi_cmd));
69 if (retval < (int)sizeof(struct vpi_cmd))
76 * jtag_vpi_reset - ask to reset the JTAG device
77 * @trst: 1 if TRST is to be asserted
78 * @srst: 1 if SRST is to be asserted
80 static int jtag_vpi_reset(int trst, int srst)
86 return jtag_vpi_send_cmd(&vpi);
90 * jtag_vpi_tms_seq - ask a TMS sequence transition to JTAG
91 * @bits: TMS bits to be written (bit0, bit1 .. bitN)
92 * @nb_bits: number of TMS bits (between 1 and 8)
94 * Write a serie of TMS transitions, where each transition consists in :
95 * - writing out TCK=0, TMS=<new_state>, TDI=<???>
96 * - writing out TCK=1, TMS=<new_state>, TDI=<???> which triggers the transition
97 * The function ensures that at the end of the sequence, the clock (TCK) is put
100 static int jtag_vpi_tms_seq(const uint8_t *bits, int nb_bits)
105 nb_bytes = DIV_ROUND_UP(nb_bits, 8);
107 vpi.cmd = CMD_TMS_SEQ;
108 memcpy(vpi.buffer_out, bits, nb_bytes);
109 vpi.length = nb_bytes;
110 vpi.nb_bits = nb_bits;
112 return jtag_vpi_send_cmd(&vpi);
116 * jtag_vpi_path_move - ask a TMS sequence transition to JTAG
117 * @cmd: path transition
119 * Write a serie of TMS transitions, where each transition consists in :
120 * - writing out TCK=0, TMS=<new_state>, TDI=<???>
121 * - writing out TCK=1, TMS=<new_state>, TDI=<???> which triggers the transition
122 * The function ensures that at the end of the sequence, the clock (TCK) is put
126 static int jtag_vpi_path_move(struct pathmove_command *cmd)
128 uint8_t trans[DIV_ROUND_UP(cmd->num_states, 8)];
130 memset(trans, 0, DIV_ROUND_UP(cmd->num_states, 8));
132 for (int i = 0; i < cmd->num_states; i++) {
133 if (tap_state_transition(tap_get_state(), true) == cmd->path[i])
134 buf_set_u32(trans, i, 1, 1);
135 tap_set_state(cmd->path[i]);
138 return jtag_vpi_tms_seq(trans, cmd->num_states);
142 * jtag_vpi_tms - ask a tms command
145 static int jtag_vpi_tms(struct tms_command *cmd)
147 return jtag_vpi_tms_seq(cmd->bits, cmd->num_bits);
150 static int jtag_vpi_state_move(tap_state_t state)
152 if (tap_get_state() == state)
155 uint8_t tms_scan = tap_get_tms_path(tap_get_state(), state);
156 int tms_len = tap_get_tms_path_len(tap_get_state(), state);
158 int retval = jtag_vpi_tms_seq(&tms_scan, tms_len);
159 if (retval != ERROR_OK)
162 tap_set_state(state);
167 static int jtag_vpi_queue_tdi_xfer(uint8_t *bits, int nb_bits, int tap_shift)
170 int nb_bytes = DIV_ROUND_UP(nb_bits, 8);
172 vpi.cmd = tap_shift ? CMD_SCAN_CHAIN_FLIP_TMS : CMD_SCAN_CHAIN;
175 memcpy(vpi.buffer_out, bits, nb_bytes);
177 memset(vpi.buffer_out, 0xff, nb_bytes);
179 vpi.length = nb_bytes;
180 vpi.nb_bits = nb_bits;
182 int retval = jtag_vpi_send_cmd(&vpi);
183 if (retval != ERROR_OK)
186 retval = jtag_vpi_receive_cmd(&vpi);
187 if (retval != ERROR_OK)
191 memcpy(bits, vpi.buffer_in, nb_bytes);
197 * jtag_vpi_queue_tdi - short description
198 * @bits: bits to be queued on TDI (or NULL if 0 are to be queued)
199 * @nb_bits: number of bits
201 static int jtag_vpi_queue_tdi(uint8_t *bits, int nb_bits, int tap_shift)
203 int nb_xfer = DIV_ROUND_UP(nb_bits, XFERT_MAX_SIZE * 8);
204 uint8_t *xmit_buffer = bits;
205 int xmit_nb_bits = nb_bits;
212 retval = jtag_vpi_queue_tdi_xfer(&xmit_buffer[i], xmit_nb_bits, tap_shift);
213 if (retval != ERROR_OK)
216 retval = jtag_vpi_queue_tdi_xfer(&xmit_buffer[i], XFERT_MAX_SIZE * 8, NO_TAP_SHIFT);
217 if (retval != ERROR_OK)
219 xmit_nb_bits -= XFERT_MAX_SIZE * 8;
230 * jtag_vpi_clock_tms - clock a TMS transition
231 * @tms: the TMS to be sent
233 * Triggers a TMS transition (ie. one JTAG TAP state move).
235 static int jtag_vpi_clock_tms(int tms)
237 const uint8_t tms_0 = 0;
238 const uint8_t tms_1 = 1;
240 return jtag_vpi_tms_seq(tms ? &tms_1 : &tms_0, 1);
244 * jtag_vpi_scan - launches a DR-scan or IR-scan
245 * @cmd: the command to launch
247 * Launch a JTAG IR-scan or DR-scan
249 * Returns ERROR_OK if OK, ERROR_xxx if a read/write error occured.
251 static int jtag_vpi_scan(struct scan_command *cmd)
255 int retval = ERROR_OK;
257 scan_bits = jtag_build_buffer(cmd, &buf);
260 retval = jtag_vpi_state_move(TAP_IRSHIFT);
261 if (retval != ERROR_OK)
264 retval = jtag_vpi_state_move(TAP_DRSHIFT);
265 if (retval != ERROR_OK)
269 if (cmd->end_state == TAP_DRSHIFT) {
270 retval = jtag_vpi_queue_tdi(buf, scan_bits, NO_TAP_SHIFT);
271 if (retval != ERROR_OK)
274 retval = jtag_vpi_queue_tdi(buf, scan_bits, TAP_SHIFT);
275 if (retval != ERROR_OK)
279 if (cmd->end_state != TAP_DRSHIFT) {
281 * As our JTAG is in an unstable state (IREXIT1 or DREXIT1), move it
282 * forward to a stable IRPAUSE or DRPAUSE.
284 retval = jtag_vpi_clock_tms(0);
285 if (retval != ERROR_OK)
289 tap_set_state(TAP_IRPAUSE);
291 tap_set_state(TAP_DRPAUSE);
294 retval = jtag_read_buffer(buf, cmd);
295 if (retval != ERROR_OK)
301 if (cmd->end_state != TAP_DRSHIFT) {
302 retval = jtag_vpi_state_move(cmd->end_state);
303 if (retval != ERROR_OK)
310 static int jtag_vpi_runtest(int cycles, tap_state_t state)
314 retval = jtag_vpi_state_move(TAP_IDLE);
315 if (retval != ERROR_OK)
318 retval = jtag_vpi_queue_tdi(NULL, cycles, TAP_SHIFT);
319 if (retval != ERROR_OK)
322 return jtag_vpi_state_move(state);
325 static int jtag_vpi_stableclocks(int cycles)
327 return jtag_vpi_queue_tdi(NULL, cycles, TAP_SHIFT);
330 static int jtag_vpi_execute_queue(void)
332 struct jtag_command *cmd;
333 int retval = ERROR_OK;
335 for (cmd = jtag_command_queue; retval == ERROR_OK && cmd != NULL;
339 retval = jtag_vpi_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
342 retval = jtag_vpi_runtest(cmd->cmd.runtest->num_cycles,
343 cmd->cmd.runtest->end_state);
345 case JTAG_STABLECLOCKS:
346 retval = jtag_vpi_stableclocks(cmd->cmd.stableclocks->num_cycles);
349 retval = jtag_vpi_state_move(cmd->cmd.statemove->end_state);
352 retval = jtag_vpi_path_move(cmd->cmd.pathmove);
355 retval = jtag_vpi_tms(cmd->cmd.tms);
358 jtag_sleep(cmd->cmd.sleep->us);
361 retval = jtag_vpi_scan(cmd->cmd.scan);
369 static int jtag_vpi_init(void)
371 sockfd = socket(AF_INET, SOCK_STREAM, 0);
373 LOG_ERROR("Could not create socket");
377 memset(&serv_addr, 0, sizeof(serv_addr));
379 serv_addr.sin_family = AF_INET;
380 serv_addr.sin_port = htons(server_port);
382 serv_addr.sin_addr.s_addr = inet_addr(SERVER_ADDRESS);
384 if (serv_addr.sin_addr.s_addr == INADDR_NONE) {
385 LOG_ERROR("inet_addr error occured");
389 if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
391 LOG_ERROR("Can't connect to %s : %u", SERVER_ADDRESS, server_port);
392 return ERROR_COMMAND_CLOSE_CONNECTION;
395 LOG_INFO("Connection to %s : %u succeed", SERVER_ADDRESS, server_port);
400 static int jtag_vpi_quit(void)
402 return close(sockfd);
405 COMMAND_HANDLER(jtag_vpi_set_port)
408 LOG_WARNING("You need to set a port number");
410 COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], server_port);
412 LOG_INFO("Set server port to %u", server_port);
418 static const struct command_registration jtag_vpi_command_handlers[] = {
420 .name = "jtag_vpi_set_port",
421 .handler = &jtag_vpi_set_port,
422 .mode = COMMAND_CONFIG,
423 .help = "set the port of the VPI server",
424 .usage = "description_string",
426 COMMAND_REGISTRATION_DONE
429 struct jtag_interface jtag_vpi_interface = {
431 .supported = DEBUG_CAP_TMS_SEQ,
432 .commands = jtag_vpi_command_handlers,
433 .transports = jtag_only,
435 .init = jtag_vpi_init,
436 .quit = jtag_vpi_quit,
437 .execute_queue = jtag_vpi_execute_queue,