--- /dev/null
+/*
+ * JTAG to VPI driver
+ *
+ * Copyright (C) 2013 Franck Jullien, <elec4fun@gmail.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <jtag/interface.h>
+#include <arpa/inet.h>
+
+#define NO_TAP_SHIFT 0
+#define TAP_SHIFT 1
+
+#define SERVER_ADDRESS "127.0.0.1"
+#define SERVER_PORT 5555
+
+#define XFERT_MAX_SIZE 512
+
+#define CMD_RESET 0
+#define CMD_TMS_SEQ 1
+#define CMD_SCAN_CHAIN 2
+#define CMD_SCAN_CHAIN_FLIP_TMS 3
+#define CMD_STOP_SIMU 4
+
+int server_port = SERVER_PORT;
+
+int sockfd;
+struct sockaddr_in serv_addr;
+
+struct vpi_cmd {
+ int cmd;
+ unsigned char buffer_out[XFERT_MAX_SIZE];
+ unsigned char buffer_in[XFERT_MAX_SIZE];
+ int length;
+ int nb_bits;
+};
+
+static int jtag_vpi_send_cmd(struct vpi_cmd *vpi)
+{
+ int retval = write(sockfd, vpi, sizeof(struct vpi_cmd));
+ if (retval <= 0)
+ return ERROR_FAIL;
+
+ return ERROR_OK;
+}
+
+static int jtag_vpi_receive_cmd(struct vpi_cmd *vpi)
+{
+ int retval = read(sockfd, vpi, sizeof(struct vpi_cmd));
+ if (retval < (int)sizeof(struct vpi_cmd))
+ return ERROR_FAIL;
+
+ return ERROR_OK;
+}
+
+/**
+ * jtag_vpi_reset - ask to reset the JTAG device
+ * @trst: 1 if TRST is to be asserted
+ * @srst: 1 if SRST is to be asserted
+ */
+static int jtag_vpi_reset(int trst, int srst)
+{
+ struct vpi_cmd vpi;
+
+ vpi.cmd = CMD_RESET;
+ vpi.length = 0;
+ return jtag_vpi_send_cmd(&vpi);
+}
+
+/**
+ * jtag_vpi_tms_seq - ask a TMS sequence transition to JTAG
+ * @bits: TMS bits to be written (bit0, bit1 .. bitN)
+ * @nb_bits: number of TMS bits (between 1 and 8)
+ *
+ * Write a serie of TMS transitions, where each transition consists in :
+ * - writing out TCK=0, TMS=<new_state>, TDI=<???>
+ * - writing out TCK=1, TMS=<new_state>, TDI=<???> which triggers the transition
+ * The function ensures that at the end of the sequence, the clock (TCK) is put
+ * low.
+ */
+static int jtag_vpi_tms_seq(const uint8_t *bits, int nb_bits)
+{
+ struct vpi_cmd vpi;
+ int nb_bytes;
+
+ nb_bytes = (nb_bits / 8) + !!(nb_bits % 8);
+
+ vpi.cmd = CMD_TMS_SEQ;
+ memcpy(vpi.buffer_out, bits, nb_bytes);
+ vpi.length = nb_bytes;
+ vpi.nb_bits = nb_bits;
+
+ return jtag_vpi_send_cmd(&vpi);
+}
+
+/**
+ * jtag_vpi_path_move - ask a TMS sequence transition to JTAG
+ * @cmd: path transition
+ *
+ * Write a serie of TMS transitions, where each transition consists in :
+ * - writing out TCK=0, TMS=<new_state>, TDI=<???>
+ * - writing out TCK=1, TMS=<new_state>, TDI=<???> which triggers the transition
+ * The function ensures that at the end of the sequence, the clock (TCK) is put
+ * low.
+ */
+
+static int jtag_vpi_path_move(struct pathmove_command *cmd)
+{
+ uint16_t trans = 0;
+ int retval;
+ int i;
+
+ for (i = 0; i < cmd->num_states; i++) {
+ if (tap_state_transition(tap_get_state(), true) == cmd->path[i])
+ trans = trans | 1;
+ trans = trans << 1;
+ }
+
+ retval = jtag_vpi_tms_seq((uint8_t *)&trans, 1);
+ if (retval != ERROR_OK)
+ return retval;
+
+ tap_set_state(cmd->path[i]);
+
+ return ERROR_OK;
+}
+
+/**
+ * jtag_vpi_tms - ask a tms command
+ * @cmd: tms command
+ */
+static int jtag_vpi_tms(struct tms_command *cmd)
+{
+ return jtag_vpi_tms_seq(cmd->bits, cmd->num_bits);
+}
+
+static int jtag_vpi_state_move(tap_state_t state)
+{
+ if (tap_get_state() == state)
+ return ERROR_OK;
+
+ uint8_t tms_scan = tap_get_tms_path(tap_get_state(), state);
+ int tms_len = tap_get_tms_path_len(tap_get_state(), state);
+
+ int retval = jtag_vpi_tms_seq(&tms_scan, tms_len);
+ if (retval != ERROR_OK)
+ return retval;
+
+ tap_set_state(state);
+
+ return ERROR_OK;
+}
+
+static int jtag_vpi_queue_tdi_xfer(uint8_t *bits, int nb_bits, int tap_shift)
+{
+ struct vpi_cmd vpi;
+ int nb_bytes = (nb_bits / 8) + !!(nb_bits % 8);
+
+ vpi.cmd = tap_shift ? CMD_SCAN_CHAIN_FLIP_TMS : CMD_SCAN_CHAIN;
+
+ if (bits)
+ memcpy(vpi.buffer_out, bits, nb_bytes);
+ else
+ memset(vpi.buffer_out, 0xff, nb_bytes);
+
+ vpi.length = nb_bytes;
+ vpi.nb_bits = nb_bits;
+
+ int retval = jtag_vpi_send_cmd(&vpi);
+ if (retval != ERROR_OK)
+ return retval;
+
+ retval = jtag_vpi_receive_cmd(&vpi);
+ if (retval != ERROR_OK)
+ return retval;
+
+ if (bits)
+ memcpy(bits, vpi.buffer_in, nb_bytes);
+
+ return ERROR_OK;
+}
+
+/**
+ * jtag_vpi_queue_tdi - short description
+ * @bits: bits to be queued on TDI (or NULL if 0 are to be queued)
+ * @nb_bits: number of bits
+ */
+static int jtag_vpi_queue_tdi(uint8_t *bits, int nb_bits, int tap_shift)
+{
+ int nb_xfer = (nb_bits / (XFERT_MAX_SIZE * 8)) + !!(nb_bits % (XFERT_MAX_SIZE * 8));
+ uint8_t *xmit_buffer = bits;
+ int xmit_nb_bits = nb_bits;
+ int i = 0;
+ int retval;
+
+ while (nb_xfer) {
+
+ if (nb_xfer == 1) {
+ retval = jtag_vpi_queue_tdi_xfer(&xmit_buffer[i], xmit_nb_bits, tap_shift);
+ if (retval != ERROR_OK)
+ return retval;
+ } else {
+ retval = jtag_vpi_queue_tdi_xfer(&xmit_buffer[i], XFERT_MAX_SIZE * 8, NO_TAP_SHIFT);
+ if (retval != ERROR_OK)
+ return retval;
+ xmit_nb_bits -= XFERT_MAX_SIZE * 8;
+ i += XFERT_MAX_SIZE;
+ }
+
+ nb_xfer--;
+ }
+
+ return ERROR_OK;
+}
+
+/**
+ * jtag_vpi_clock_tms - clock a TMS transition
+ * @tms: the TMS to be sent
+ *
+ * Triggers a TMS transition (ie. one JTAG TAP state move).
+ */
+static int jtag_vpi_clock_tms(int tms)
+{
+ const uint8_t tms_0 = 0;
+ const uint8_t tms_1 = 1;
+
+ return jtag_vpi_tms_seq(tms ? &tms_1 : &tms_0, 1);
+}
+
+/**
+ * jtag_vpi_scan - launches a DR-scan or IR-scan
+ * @cmd: the command to launch
+ *
+ * Launch a JTAG IR-scan or DR-scan
+ *
+ * Returns ERROR_OK if OK, ERROR_xxx if a read/write error occured.
+ */
+static int jtag_vpi_scan(struct scan_command *cmd)
+{
+ int scan_bits;
+ uint8_t *buf = NULL;
+ int retval = ERROR_OK;
+
+ scan_bits = jtag_build_buffer(cmd, &buf);
+
+ if (cmd->ir_scan) {
+ retval = jtag_vpi_state_move(TAP_IRSHIFT);
+ if (retval != ERROR_OK)
+ return retval;
+ } else {
+ retval = jtag_vpi_state_move(TAP_DRSHIFT);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+
+ if (cmd->end_state == TAP_DRSHIFT) {
+ retval = jtag_vpi_queue_tdi(buf, scan_bits, NO_TAP_SHIFT);
+ if (retval != ERROR_OK)
+ return retval;
+ } else {
+ retval = jtag_vpi_queue_tdi(buf, scan_bits, TAP_SHIFT);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+
+ if (cmd->end_state != TAP_DRSHIFT) {
+ /*
+ * As our JTAG is in an unstable state (IREXIT1 or DREXIT1), move it
+ * forward to a stable IRPAUSE or DRPAUSE.
+ */
+ retval = jtag_vpi_clock_tms(0);
+ if (retval != ERROR_OK)
+ return retval;
+
+ if (cmd->ir_scan)
+ tap_set_state(TAP_IRPAUSE);
+ else
+ tap_set_state(TAP_DRPAUSE);
+ }
+
+ retval = jtag_read_buffer(buf, cmd);
+ if (retval != ERROR_OK)
+ return retval;
+
+ if (buf)
+ free(buf);
+
+ if (cmd->end_state != TAP_DRSHIFT) {
+ retval = jtag_vpi_state_move(cmd->end_state);
+ if (retval != ERROR_OK)
+ return retval;
+ }
+
+ return ERROR_OK;
+}
+
+static int jtag_vpi_runtest(int cycles, tap_state_t state)
+{
+ int retval;
+
+ retval = jtag_vpi_state_move(TAP_IDLE);
+ if (retval != ERROR_OK)
+ return retval;
+
+ retval = jtag_vpi_queue_tdi(NULL, cycles, TAP_SHIFT);
+ if (retval != ERROR_OK)
+ return retval;
+
+ return jtag_vpi_state_move(state);
+}
+
+static int jtag_vpi_stableclocks(int cycles)
+{
+ return jtag_vpi_queue_tdi(NULL, cycles, TAP_SHIFT);
+}
+
+static int jtag_vpi_execute_queue(void)
+{
+ struct jtag_command *cmd;
+ int retval = ERROR_OK;
+
+ for (cmd = jtag_command_queue; retval == ERROR_OK && cmd != NULL;
+ cmd = cmd->next) {
+ switch (cmd->type) {
+ case JTAG_RESET:
+ retval = jtag_vpi_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
+ break;
+ case JTAG_RUNTEST:
+ retval = jtag_vpi_runtest(cmd->cmd.runtest->num_cycles,
+ cmd->cmd.runtest->end_state);
+ break;
+ case JTAG_STABLECLOCKS:
+ retval = jtag_vpi_stableclocks(cmd->cmd.stableclocks->num_cycles);
+ break;
+ case JTAG_TLR_RESET:
+ retval = jtag_vpi_state_move(cmd->cmd.statemove->end_state);
+ break;
+ case JTAG_PATHMOVE:
+ retval = jtag_vpi_path_move(cmd->cmd.pathmove);
+ break;
+ case JTAG_TMS:
+ retval = jtag_vpi_tms(cmd->cmd.tms);
+ break;
+ case JTAG_SLEEP:
+ jtag_sleep(cmd->cmd.sleep->us);
+ break;
+ case JTAG_SCAN:
+ retval = jtag_vpi_scan(cmd->cmd.scan);
+ break;
+ }
+ }
+
+ return retval;
+}
+
+static int jtag_vpi_init(void)
+{
+ sockfd = socket(AF_INET, SOCK_STREAM, 0);
+ if (sockfd < 0) {
+ LOG_ERROR("Could not create socket");
+ return ERROR_FAIL;
+ }
+
+ memset(&serv_addr, 0, sizeof(serv_addr));
+
+ serv_addr.sin_family = AF_INET;
+ serv_addr.sin_port = htons(server_port);
+
+ if (inet_pton(AF_INET, SERVER_ADDRESS, &serv_addr.sin_addr) <= 0) {
+ LOG_ERROR("inet_pton error occured");
+ return ERROR_FAIL;
+ }
+
+ if (connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
+ close(sockfd);
+ LOG_ERROR("Can't connect to %s : %u", SERVER_ADDRESS, server_port);
+ return ERROR_COMMAND_CLOSE_CONNECTION;
+ }
+
+ LOG_INFO("Connection to %s : %u succeed", SERVER_ADDRESS, server_port);
+
+ return ERROR_OK;
+}
+
+static int jtag_vpi_quit(void)
+{
+ return close(sockfd);
+}
+
+COMMAND_HANDLER(jtag_vpi_set_port)
+{
+ if (CMD_ARGC == 0)
+ LOG_WARNING("You need to set a port number");
+ else
+ COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], server_port);
+
+ LOG_INFO("Set server port to %u", server_port);
+
+ return ERROR_OK;
+}
+
+
+static const struct command_registration jtag_vpi_command_handlers[] = {
+ {
+ .name = "jtag_vpi_set_port",
+ .handler = &jtag_vpi_set_port,
+ .mode = COMMAND_CONFIG,
+ .help = "set the port of the VPI server",
+ .usage = "description_string",
+ },
+ COMMAND_REGISTRATION_DONE
+};
+
+struct jtag_interface jtag_vpi_interface = {
+ .name = "jtag_vpi",
+ .supported = DEBUG_CAP_TMS_SEQ,
+ .commands = jtag_vpi_command_handlers,
+ .transports = jtag_only,
+
+ .init = jtag_vpi_init,
+ .quit = jtag_vpi_quit,
+ .execute_queue = jtag_vpi_execute_queue,
+};
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