openrisc: add support for JTAG Serial Port

Change-Id: I623a8c74bcca2edb5f996b69c02d73a6f67b7d34
Signed-off-by: Franck Jullien <franck.jullien@gmail.com>
Reviewed-on: http://openocd.zylin.com/2162
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

5 files changed, 390 insertions, 5 deletions

diff --git a/src/target/openrisc/Makefile.am b/src/target/openrisc/Makefile.am
index f1e7eaa..b00a30d 100644
--- a/src/target/openrisc/Makefile.am
+++ b/src/target/openrisc/Makefile.am
@@ -8,9 +8,11 @@ OPENRISC_SRC = \
 	or1k_du_adv.c \
 	or1k_tap_mohor.c \
 	or1k_tap_vjtag.c \
-	or1k_tap_xilinx_bscan.c
+	or1k_tap_xilinx_bscan.c \
+	jsp_server.c
 
 noinst_HEADERS = \
 	or1k.h \
 	or1k_du.h \
-	or1k_tap.h
+	or1k_tap.h \
+	jsp_server.h
diff --git a/src/target/openrisc/jsp_server.c b/src/target/openrisc/jsp_server.c
new file mode 100644
index 0000000..597bfcb
--- /dev/null
+++ b/src/target/openrisc/jsp_server.c
@@ -0,0 +1,247 @@
+/***************************************************************************
+ *   Copyright (C) 2014 by Franck Jullien                                  *
+ *   franck.jullien@gmail.com                                              *
+ *                                                                         *
+ *   Based on ./src/server/telnet_server.c                                 *
+ *                                                                         *
+ *   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.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.           *
+ ***************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <server/telnet_server.h>
+
+#include "or1k_tap.h"
+#include "or1k_du.h"
+#include "jsp_server.h"
+
+static char *jsp_port;
+
+/**A skim of the relevant RFCs suggests that if my application simply sent the
+ * characters IAC DONT LINEMODE (\377\376\042) as soon as the client connects,
+ * the client should be forced into character mode. However it doesn't make any difference.
+ */
+
+static char *negotiate =
+	"\xFF\xFB\x03"			/* IAC WILL Suppress Go Ahead */
+	"\xFF\xFB\x01"			/* IAC WILL Echo */
+	"\xFF\xFD\x03"			/* IAC DO Suppress Go Ahead */
+	"\xFF\xFE\x01";			/* IAC DON'T Echo */
+
+/* The only way we can detect that the socket is closed is the first time
+ * we write to it, we will fail. Subsequent write operations will
+ * succeed. Shudder!
+ */
+static int telnet_write(struct connection *connection, const void *data, int len)
+{
+	struct telnet_connection *t_con = connection->priv;
+	if (t_con->closed)
+		return ERROR_SERVER_REMOTE_CLOSED;
+
+	if (connection_write(connection, data, len) == len)
+		return ERROR_OK;
+	t_con->closed = 1;
+	return ERROR_SERVER_REMOTE_CLOSED;
+}
+
+int jsp_poll_read(void *priv)
+{
+	struct jsp_service *jsp_service = (struct jsp_service *)priv;
+	unsigned char out_buffer[10];
+	unsigned char in_buffer[10];
+	int out_len = 0;
+	int in_len;
+
+	if (!jsp_service->connection)
+		return ERROR_FAIL;
+
+	memset(out_buffer, 0, 10);
+
+	or1k_adv_jtag_jsp_xfer(jsp_service->jtag_info, &out_len, out_buffer, &in_len, in_buffer);
+	if (in_len)
+		telnet_write(jsp_service->connection, in_buffer, in_len);
+
+	return ERROR_OK;
+}
+
+static int jsp_new_connection(struct connection *connection)
+{
+	struct telnet_connection *telnet_connection = malloc(sizeof(struct telnet_connection));
+	struct jsp_service *jsp_service = connection->service->priv;
+
+	connection->priv = telnet_connection;
+
+	/* initialize telnet connection information */
+	telnet_connection->closed = 0;
+	telnet_connection->line_size = 0;
+	telnet_connection->line_cursor = 0;
+	telnet_connection->option_size = 0;
+	telnet_connection->state = TELNET_STATE_DATA;
+
+	/* negotiate telnet options */
+	telnet_write(connection, negotiate, strlen(negotiate));
+
+	/* print connection banner */
+	if (jsp_service->banner) {
+		telnet_write(connection, jsp_service->banner, strlen(jsp_service->banner));
+		telnet_write(connection, "\r\n", 2);
+	}
+
+	jsp_service->connection = connection;
+
+	int retval = target_register_timer_callback(&jsp_poll_read, 1, 1, jsp_service);
+	if (ERROR_OK != retval)
+		return retval;
+
+	return ERROR_OK;
+}
+
+static int jsp_input(struct connection *connection)
+{
+	int bytes_read;
+	unsigned char buffer[TELNET_BUFFER_SIZE];
+	unsigned char *buf_p;
+	struct telnet_connection *t_con = connection->priv;
+	struct jsp_service *jsp_service = connection->service->priv;
+
+	bytes_read = connection_read(connection, buffer, TELNET_BUFFER_SIZE);
+
+	if (bytes_read == 0)
+		return ERROR_SERVER_REMOTE_CLOSED;
+	else if (bytes_read == -1) {
+		LOG_ERROR("error during read: %s", strerror(errno));
+		return ERROR_SERVER_REMOTE_CLOSED;
+	}
+
+	buf_p = buffer;
+	while (bytes_read) {
+		switch (t_con->state) {
+			case TELNET_STATE_DATA:
+				if (*buf_p == 0xff)
+					t_con->state = TELNET_STATE_IAC;
+				else {
+					int out_len = 1;
+					int in_len;
+					unsigned char in_buffer[10];
+					or1k_adv_jtag_jsp_xfer(jsp_service->jtag_info,
+							       &out_len, buf_p, &in_len,
+							       in_buffer);
+					if (in_len)
+						telnet_write(connection,
+							     in_buffer, in_len);
+				}
+				break;
+			case TELNET_STATE_IAC:
+				switch (*buf_p) {
+				case 0xfe:
+					t_con->state = TELNET_STATE_DONT;
+					break;
+				case 0xfd:
+					t_con->state = TELNET_STATE_DO;
+					break;
+				case 0xfc:
+					t_con->state = TELNET_STATE_WONT;
+					break;
+				case 0xfb:
+					t_con->state = TELNET_STATE_WILL;
+					break;
+				}
+				break;
+			case TELNET_STATE_SB:
+				break;
+			case TELNET_STATE_SE:
+				break;
+			case TELNET_STATE_WILL:
+			case TELNET_STATE_WONT:
+			case TELNET_STATE_DO:
+			case TELNET_STATE_DONT:
+				t_con->state = TELNET_STATE_DATA;
+				break;
+			default:
+				LOG_ERROR("unknown telnet state");
+				exit(-1);
+		}
+
+		bytes_read--;
+		buf_p++;
+	}
+
+	return ERROR_OK;
+}
+
+static int jsp_connection_closed(struct connection *connection)
+{
+	struct telnet_connection *t_con = connection->priv;
+	struct jsp_service *jsp_service = connection->service->priv;
+
+	if (t_con->prompt) {
+		free(t_con->prompt);
+		t_con->prompt = NULL;
+	}
+
+	int retval = target_unregister_timer_callback(&jsp_poll_read, jsp_service);
+	if (ERROR_OK != retval)
+		return retval;
+
+	if (connection->priv) {
+		free(connection->priv);
+		connection->priv = NULL;
+	} else
+		LOG_ERROR("BUG: connection->priv == NULL");
+
+	return ERROR_OK;
+}
+
+int jsp_init(struct or1k_jtag *jtag_info, char *banner)
+{
+	struct jsp_service *jsp_service = malloc(sizeof(struct jsp_service));
+	jsp_service->banner = banner;
+	jsp_service->jtag_info = jtag_info;
+
+	return add_service("jsp",
+		jsp_port,
+		1,
+		jsp_new_connection,
+		jsp_input,
+		jsp_connection_closed,
+		jsp_service);
+}
+
+COMMAND_HANDLER(handle_jsp_port_command)
+{
+	return CALL_COMMAND_HANDLER(server_pipe_command, &jsp_port);
+}
+
+static const struct command_registration jsp_command_handlers[] = {
+	{
+		.name = "jsp_port",
+		.handler = handle_jsp_port_command,
+		.mode = COMMAND_ANY,
+		.help = "Specify port on which to listen "
+			"for incoming JSP telnet connections.",
+		.usage = "[port_num]",
+	},
+	COMMAND_REGISTRATION_DONE
+};
+
+int jsp_register_commands(struct command_context *cmd_ctx)
+{
+	jsp_port = strdup("7777");
+	return register_commands(cmd_ctx, NULL, jsp_command_handlers);
+}
+
diff --git a/src/target/openrisc/jsp_server.h b/src/target/openrisc/jsp_server.h
new file mode 100644
index 0000000..3e7c114
--- /dev/null
+++ b/src/target/openrisc/jsp_server.h
@@ -0,0 +1,17 @@
+#ifndef _JSP_SERVER_H_
+#define _JSP_SERVER_H_
+
+#include "or1k_tap.h"
+#include "or1k.h"
+#include "or1k_du.h"
+
+struct jsp_service {
+	char *banner;
+	struct or1k_jtag *jtag_info;
+	struct connection *connection;
+};
+
+int jsp_init(struct or1k_jtag *jtag_info, char *banner);
+int jsp_register_commands(struct command_context *cmd_ctx);
+
+#endif	/* _JSP_SERVER_H_ */
diff --git a/src/target/openrisc/or1k_du.h b/src/target/openrisc/or1k_du.h
index 564241d..f5ee364 100644
--- a/src/target/openrisc/or1k_du.h
+++ b/src/target/openrisc/or1k_du.h
@@ -73,5 +73,9 @@ static inline struct or1k_du *or1k_to_du(struct or1k_common *or1k)
 	return (struct or1k_du *)jtag->du_core;
 }
 
+int or1k_adv_jtag_jsp_xfer(struct or1k_jtag *jtag_info,
+				  int *out_len, unsigned char *out_buffer,
+				  int *in_len, unsigned char *in_buffer);
+
 #endif
 
diff --git a/src/target/openrisc/or1k_du_adv.c b/src/target/openrisc/or1k_du_adv.c
index 8a5562f..e25a711 100644
--- a/src/target/openrisc/or1k_du_adv.c
+++ b/src/target/openrisc/or1k_du_adv.c
@@ -1,8 +1,8 @@
 /***************************************************************************
- *   Copyright (C) 2013 by Franck Jullien                                  *
+ *   Copyright (C) 2013-2014 by Franck Jullien                             *
  *   elec4fun@gmail.com                                                    *
  *                                                                         *
- *   Inspired from adv_jtag_bridge which is:                                *
+ *   Inspired from adv_jtag_bridge which is:                               *
  *   Copyright (C) 2008-2010 Nathan Yawn                                   *
  *   nyawn@opencores.net                                                   *
  *                                                                         *
@@ -33,10 +33,19 @@
 #include "or1k_tap.h"
 #include "or1k.h"
 #include "or1k_du.h"
+#include "jsp_server.h"
 
 #include <target/target.h>
 #include <jtag/jtag.h>
 
+#define JSP_BANNER "\n\r" \
+		   "******************************\n\r" \
+		   "**     JTAG Serial Port     **\n\r" \
+		   "******************************\n\r" \
+		   "\n\r"
+
+#define NO_OPTION			0
+
 /* This an option to the adv debug unit.
  * If this is defined, status bits will be skipped on burst
  * reads and writes to improve download speeds.
@@ -44,6 +53,17 @@
  */
 #define ADBG_USE_HISPEED		1
 
+/* This an option to the adv debug unit.
+ * If this is defined, the JTAG Serial Port Server is started.
+ * This option must match the RTL configured option.
+ */
+#define ENABLE_JSP_SERVER		2
+
+/* Define this if you intend to use the JSP in a system with multiple
+ * devices on the JTAG chain
+ */
+#define ENABLE_JSP_MULTI		4
+
 /* Definitions for the top-level debug unit.  This really just consists
  * of a single register, used to select the active debug module ("chain").
  */
@@ -182,6 +202,17 @@ static int or1k_adv_jtag_init(struct or1k_jtag *jtag_info)
 	if (or1k_du_adv.options & ADBG_USE_HISPEED)
 		LOG_INFO("adv debug unit is configured with option ADBG_USE_HISPEED");
 
+	if (or1k_du_adv.options & ENABLE_JSP_SERVER) {
+		if (or1k_du_adv.options & ENABLE_JSP_MULTI)
+			LOG_INFO("adv debug unit is configured with option ENABLE_JSP_MULTI");
+		LOG_INFO("adv debug unit is configured with option ENABLE_JSP_SERVER");
+		retval = jsp_init(jtag_info, JSP_BANNER);
+		if (retval != ERROR_OK) {
+			LOG_ERROR("Couldn't start the JSP server");
+			return retval;
+		}
+	}
+
 	LOG_DEBUG("Init done");
 
 	return ERROR_OK;
@@ -962,9 +993,93 @@ static int or1k_adv_jtag_write_memory(struct or1k_jtag *jtag_info,
 	return ERROR_OK;
 }
 
+int or1k_adv_jtag_jsp_xfer(struct or1k_jtag *jtag_info,
+				  int *out_len, unsigned char *out_buffer,
+				  int *in_len, unsigned char *in_buffer)
+{
+	LOG_DEBUG("JSP transfert");
+
+	int retval;
+	if (!jtag_info->or1k_jtag_inited)
+		return ERROR_OK;
+
+	retval = adbg_select_module(jtag_info, DC_JSP);
+	if (retval != ERROR_OK)
+		return retval;
+
+	/* return nb char xmit */
+	int xmitsize;
+	if (*out_len > 8)
+		xmitsize = 8;
+	else
+		xmitsize = *out_len;
+
+	uint8_t out_data[10];
+	uint8_t in_data[10];
+	struct scan_field field;
+	int startbit, stopbit, wrapbit;
+
+	memset(out_data, 0, 10);
+
+	if (or1k_du_adv.options & ENABLE_JSP_MULTI) {
+
+		startbit = 1;
+		wrapbit = (xmitsize >> 3) & 0x1;
+		out_data[0] = (xmitsize << 5) | 0x1;  /* set the start bit */
+
+		int i;
+		/* don't copy off the end of the input array */
+		for (i = 0; i < xmitsize; i++) {
+			out_data[i + 1] = (out_buffer[i] << 1) | wrapbit;
+			wrapbit = (out_buffer[i] >> 7) & 0x1;
+		}
+
+		if (i < 8)
+			out_data[i + 1] = wrapbit;
+		else
+			out_data[9] = wrapbit;
+
+		/* If the last data bit is a '1', then we need to append a '0' so the top-level module
+		 * won't treat the burst as a 'module select' command.
+		 */
+		stopbit = !!(out_data[9] & 0x01);
+
+	} else {
+		startbit = 0;
+		/* First byte out has write count in upper nibble */
+		out_data[0] = 0x0 | (xmitsize << 4);
+		if (xmitsize > 0)
+			memcpy(&out_data[1], out_buffer, xmitsize);
+
+		/* If the last data bit is a '1', then we need to append a '0' so the top-level module
+		 * won't treat the burst as a 'module select' command.
+		 */
+		stopbit = !!(out_data[8] & 0x80);
+	}
+
+	field.num_bits = 72 + startbit + stopbit;
+	field.out_value = out_data;
+	field.in_value = in_data;
+
+	jtag_add_dr_scan(jtag_info->tap, 1, &field, TAP_IDLE);
+
+	retval = jtag_execute_queue();
+	if (retval != ERROR_OK)
+		return retval;
+
+	/* bytes available is in the upper nibble */
+	*in_len = (in_data[0] >> 4) & 0xF;
+	memcpy(in_buffer, &in_data[1], *in_len);
+
+	int bytes_free = in_data[0] & 0x0F;
+	*out_len = (bytes_free < xmitsize) ? bytes_free : xmitsize;
+
+	return ERROR_OK;
+}
+
 static struct or1k_du or1k_du_adv = {
 	.name                     = "adv",
-	.options                  = ADBG_USE_HISPEED,
+	.options                  = NO_OPTION,
 	.or1k_jtag_init           = or1k_adv_jtag_init,
 
 	.or1k_is_cpu_running      = or1k_adv_is_cpu_running,