X-Git-Url: https://review.openocd.org/gitweb?p=openocd.git;a=blobdiff_plain;f=src%2Fjtag%2Fdrivers%2Fjtag_vpi.c;h=1033cedb28c95a18a38483afee01b2ebd9100a46;hp=7c42220d62ef4c9e357db54a7bd0faad23d28d4e;hb=b3d4c97b9f441b1dfe36f26d64bb80974ee06ee3;hpb=bc256b17d5e659dff56b33217a2aca94d38cc010

diff --git a/src/jtag/drivers/jtag_vpi.c b/src/jtag/drivers/jtag_vpi.c
index 7c42220d62..1033cedb28 100644
--- a/src/jtag/drivers/jtag_vpi.c
+++ b/src/jtag/drivers/jtag_vpi.c
@@ -16,6 +16,8 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #ifdef HAVE_CONFIG_H
@@ -27,6 +29,10 @@
 #include <arpa/inet.h>
 #endif
 
+#ifndef _WIN32
+#include <netinet/tcp.h>
+#endif
+
 #define NO_TAP_SHIFT	0
 #define TAP_SHIFT	1
 
@@ -202,23 +208,20 @@ static int jtag_vpi_queue_tdi_xfer(uint8_t *bits, int nb_bits, int tap_shift)
 static int jtag_vpi_queue_tdi(uint8_t *bits, int nb_bits, int tap_shift)
 {
 	int nb_xfer = DIV_ROUND_UP(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);
+			retval = jtag_vpi_queue_tdi_xfer(bits, 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);
+			retval = jtag_vpi_queue_tdi_xfer(bits, 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_bits -= XFERT_MAX_SIZE * 8;
+			if (bits)
+				bits += XFERT_MAX_SIZE;
 		}
 
 		nb_xfer--;
@@ -316,7 +319,7 @@ static int jtag_vpi_runtest(int cycles, tap_state_t state)
 	if (retval != ERROR_OK)
 		return retval;
 
-	retval = jtag_vpi_queue_tdi(NULL, cycles, TAP_SHIFT);
+	retval = jtag_vpi_queue_tdi(NULL, cycles, NO_TAP_SHIFT);
 	if (retval != ERROR_OK)
 		return retval;
 
@@ -325,7 +328,27 @@ static int jtag_vpi_runtest(int cycles, tap_state_t state)
 
 static int jtag_vpi_stableclocks(int cycles)
 {
-	return jtag_vpi_queue_tdi(NULL, cycles, TAP_SHIFT);
+	uint8_t tms_bits[4];
+	int cycles_remain = cycles;
+	int nb_bits;
+	int retval;
+	const int CYCLES_ONE_BATCH = sizeof(tms_bits) * 8;
+
+	assert(cycles >= 0);
+
+	/* use TMS=1 in TAP RESET state, TMS=0 in all other stable states */
+	memset(&tms_bits, (tap_get_state() == TAP_RESET) ? 0xff : 0x00, sizeof(tms_bits));
+
+	/* send the TMS bits */
+	while (cycles_remain > 0) {
+		nb_bits = (cycles_remain < CYCLES_ONE_BATCH) ? cycles_remain : CYCLES_ONE_BATCH;
+		retval = jtag_vpi_tms_seq(tms_bits, nb_bits);
+		if (retval != ERROR_OK)
+			return retval;
+		cycles_remain -= nb_bits;
+	}
+
+	return ERROR_OK;
 }
 
 static int jtag_vpi_execute_queue(void)
@@ -369,6 +392,8 @@ static int jtag_vpi_execute_queue(void)
 
 static int jtag_vpi_init(void)
 {
+	int flag = 1;
+
 	sockfd = socket(AF_INET, SOCK_STREAM, 0);
 	if (sockfd < 0) {
 		LOG_ERROR("Could not create socket");
@@ -396,6 +421,13 @@ static int jtag_vpi_init(void)
 		return ERROR_COMMAND_CLOSE_CONNECTION;
 	}
 
+	if (serv_addr.sin_addr.s_addr == htonl(INADDR_LOOPBACK)) {
+		/* This increases performance drematically for local
+		 * connections, which is the most likely arrangement
+		 * for a VPI connection. */
+		setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, (char *)&flag, sizeof(int));
+	}
+
 	LOG_INFO("Connection to %s : %u succeed", server_address, server_port);
 
 	return ERROR_OK;