jtag: linuxgpiod: drop extra parenthesis
[openocd.git] / src / jtag / drivers / vsllink.c
index 958067266e005712df849a3ba07821ff3ed3583b..34525d5468d695834c14d1e151c1194310ed804c 100644 (file)
@@ -1,20 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
 /***************************************************************************
  *   Copyright (C) 2009-2010 by Simon Qian <SimonQian@SimonQian.com>       *
- *                                                                         *
- *   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.           *
  ***************************************************************************/
 
 /* Versaloon is a programming tool for multiple MCUs.
 #include "config.h"
 #endif
 
+#include <jtag/adapter.h>
 #include <jtag/interface.h>
 #include <jtag/commands.h>
-#include "usb_common.h"
+#include <jtag/swd.h>
+#include <libusb.h>
 
 #include "versaloon/versaloon_include.h"
 #include "versaloon/versaloon.h"
@@ -60,7 +49,7 @@ static void vsllink_runtest(int num_cycles);
 static void vsllink_stableclocks(int num_cycles, int tms);
 static void vsllink_scan(bool ir_scan, enum scan_type type,
                uint8_t *buffer, int scan_size, struct scan_command *command);
-static void vsllink_reset(int trst, int srst);
+static int vsllink_reset(int trst, int srst);
 
 /* VSLLink tap buffer functions */
 static void vsllink_tap_append_step(int tms, int tdi);
@@ -70,17 +59,20 @@ static void vsllink_tap_ensure_pending(int scans);
 static void vsllink_tap_append_scan(int length, uint8_t *buffer,
                struct scan_command *command);
 
+/* VSLLink SWD functions */
+static int_least32_t vsllink_swd_frequency(int_least32_t hz);
+static int vsllink_swd_switch_seq(enum swd_special_seq seq);
+
 /* VSLLink lowlevel functions */
 struct vsllink {
-       struct usb_dev_handle *usb_handle;
+       struct libusb_context *libusb_ctx;
+       struct libusb_device_handle *usb_device_handle;
 };
 
-static struct vsllink *vsllink_usb_open(void);
+static int vsllink_usb_open(struct vsllink *vsllink);
 static void vsllink_usb_close(struct vsllink *vsllink);
 
-#if defined _DEBUG_JTAG_IO_
 static void vsllink_debug_buffer(uint8_t *buffer, int length);
-#endif
 
 static int tap_length;
 static int tap_buffer_size;
@@ -88,23 +80,25 @@ static uint8_t *tms_buffer;
 static uint8_t *tdi_buffer;
 static uint8_t *tdo_buffer;
 
-struct vsllink *vsllink_handle;
+static bool swd_mode;
 
-static int vsllink_execute_queue(void)
+static struct vsllink *vsllink_handle;
+
+static int vsllink_execute_queue(struct jtag_command *cmd_queue)
 {
-       struct jtag_command *cmd = jtag_command_queue;
+       struct jtag_command *cmd = cmd_queue;
        int scan_size;
        enum scan_type type;
        uint8_t *buffer;
 
-       DEBUG_JTAG_IO("-------------------------------------"
+       LOG_DEBUG_IO("-------------------------------------"
                " vsllink "
                "-------------------------------------");
 
-       while (cmd != NULL) {
+       while (cmd) {
                switch (cmd->type) {
                        case JTAG_RUNTEST:
-                               DEBUG_JTAG_IO("runtest %i cycles, end in %s",
+                               LOG_DEBUG_IO("runtest %i cycles, end in %s",
                                                cmd->cmd.runtest->num_cycles,
                                                tap_state_name(cmd->cmd.runtest->end_state));
 
@@ -113,7 +107,7 @@ static int vsllink_execute_queue(void)
                                break;
 
                        case JTAG_TLR_RESET:
-                               DEBUG_JTAG_IO("statemove end in %s",
+                               LOG_DEBUG_IO("statemove end in %s",
                                                tap_state_name(cmd->cmd.statemove->end_state));
 
                                vsllink_end_state(cmd->cmd.statemove->end_state);
@@ -121,7 +115,7 @@ static int vsllink_execute_queue(void)
                                break;
 
                        case JTAG_PATHMOVE:
-                               DEBUG_JTAG_IO("pathmove: %i states, end in %s",
+                               LOG_DEBUG_IO("pathmove: %i states, end in %s",
                                                cmd->cmd.pathmove->num_states,
                                                tap_state_name(cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]));
 
@@ -129,7 +123,7 @@ static int vsllink_execute_queue(void)
                                break;
 
                        case JTAG_SCAN:
-                               DEBUG_JTAG_IO("JTAG Scan...");
+                               LOG_DEBUG_IO("JTAG Scan...");
 
                                vsllink_end_state(cmd->cmd.scan->end_state);
 
@@ -137,23 +131,21 @@ static int vsllink_execute_queue(void)
                                                cmd->cmd.scan, &buffer);
 
                                if (cmd->cmd.scan->ir_scan)
-                                       DEBUG_JTAG_IO(
+                                       LOG_DEBUG_IO(
                                                        "JTAG Scan write IR(%d bits), "
                                                        "end in %s:",
                                                        scan_size,
                                                        tap_state_name(cmd->cmd.scan->end_state));
 
                                else
-                                       DEBUG_JTAG_IO(
+                                       LOG_DEBUG_IO(
                                                        "JTAG Scan write DR(%d bits), "
                                                        "end in %s:",
                                                        scan_size,
                                                        tap_state_name(cmd->cmd.scan->end_state));
 
-#ifdef _DEBUG_JTAG_IO_
-                               vsllink_debug_buffer(buffer,
-                                               DIV_ROUND_UP(scan_size, 8));
-#endif
+                               if (LOG_LEVEL_IS(LOG_LVL_DEBUG_IO))
+                                       vsllink_debug_buffer(buffer, DIV_ROUND_UP(scan_size, 8));
 
                                type = jtag_scan_type(cmd->cmd.scan);
 
@@ -162,28 +154,14 @@ static int vsllink_execute_queue(void)
                                                cmd->cmd.scan);
                                break;
 
-                       case JTAG_RESET:
-                               DEBUG_JTAG_IO("reset trst: %i srst %i",
-                                               cmd->cmd.reset->trst,
-                                               cmd->cmd.reset->srst);
-
-                               vsllink_tap_execute();
-
-                               if (cmd->cmd.reset->trst == 1)
-                                       tap_set_state(TAP_RESET);
-
-                               vsllink_reset(cmd->cmd.reset->trst,
-                                               cmd->cmd.reset->srst);
-                               break;
-
                        case JTAG_SLEEP:
-                               DEBUG_JTAG_IO("sleep %i", cmd->cmd.sleep->us);
+                               LOG_DEBUG_IO("sleep %" PRIu32, cmd->cmd.sleep->us);
                                vsllink_tap_execute();
                                jtag_sleep(cmd->cmd.sleep->us);
                                break;
 
                        case JTAG_STABLECLOCKS:
-                               DEBUG_JTAG_IO("add %d clocks",
+                               LOG_DEBUG_IO("add %d clocks",
                                                cmd->cmd.stableclocks->num_cycles);
 
                                switch (tap_get_state()) {
@@ -213,7 +191,7 @@ static int vsllink_execute_queue(void)
                                break;
 
                                case JTAG_TMS:
-                                       DEBUG_JTAG_IO("add %d jtag tms",
+                                       LOG_DEBUG_IO("add %d jtag tms",
                                                        cmd->cmd.tms->num_bits);
 
                                        vsllink_tms(cmd->cmd.tms->num_bits, cmd->cmd.tms->bits);
@@ -232,6 +210,11 @@ static int vsllink_execute_queue(void)
 
 static int vsllink_speed(int speed)
 {
+       if (swd_mode) {
+               vsllink_swd_frequency(speed * 1000);
+               return ERROR_OK;
+       }
+
        versaloon_interface.adaptors.jtag_raw.config(0, (uint16_t)speed);
        return versaloon_interface.adaptors.peripheral_commit();
 }
@@ -252,18 +235,14 @@ static int vsllink_speed_div(int jtag_speed, int *khz)
 
 static void vsllink_free_buffer(void)
 {
-       if (tdi_buffer != NULL) {
-               free(tdi_buffer);
-               tdi_buffer = NULL;
-       }
-       if (tdo_buffer != NULL) {
-               free(tdo_buffer);
-               tdo_buffer = NULL;
-       }
-       if (tms_buffer != NULL) {
-               free(tms_buffer);
-               tms_buffer = NULL;
-       }
+       free(tdi_buffer);
+       tdi_buffer = NULL;
+
+       free(tdo_buffer);
+       tdo_buffer = NULL;
+
+       free(tms_buffer);
+       tms_buffer = NULL;
 }
 
 static int vsllink_quit(void)
@@ -271,53 +250,92 @@ static int vsllink_quit(void)
        versaloon_interface.adaptors.gpio.config(0, GPIO_SRST | GPIO_TRST,
                0, 0, GPIO_SRST | GPIO_TRST);
        versaloon_interface.adaptors.gpio.fini(0);
-       versaloon_interface.adaptors.jtag_raw.fini(0);
+
+       if (swd_mode)
+               versaloon_interface.adaptors.swd.fini(0);
+       else
+               versaloon_interface.adaptors.jtag_raw.fini(0);
+
        versaloon_interface.adaptors.peripheral_commit();
        versaloon_interface.fini();
 
        vsllink_free_buffer();
        vsllink_usb_close(vsllink_handle);
 
+       libusb_exit(vsllink_handle->libusb_ctx);
+       free(vsllink_handle);
+
        return ERROR_OK;
 }
 
-static int vsllink_init(void)
+static int vsllink_interface_init(void)
 {
-       vsllink_handle = vsllink_usb_open();
-       if (vsllink_handle == 0) {
-               LOG_ERROR("Can't find USB JTAG Interface!" \
+       vsllink_handle = malloc(sizeof(struct vsllink));
+       if (!vsllink_handle) {
+               LOG_ERROR("unable to allocate memory");
+               return ERROR_FAIL;
+       }
+
+       libusb_init(&vsllink_handle->libusb_ctx);
+
+       if (vsllink_usb_open(vsllink_handle) != ERROR_OK) {
+               LOG_ERROR("Can't find USB JTAG Interface!"
                        "Please check connection and permissions.");
                return ERROR_JTAG_INIT_FAILED;
        }
        LOG_DEBUG("vsllink found on %04X:%04X",
                versaloon_interface.usb_setting.vid,
                versaloon_interface.usb_setting.pid);
-       versaloon_usb_device_handle = vsllink_handle->usb_handle;
+       versaloon_usb_device_handle = vsllink_handle->usb_device_handle;
 
-       if (ERROR_OK != versaloon_interface.init())
+       if (versaloon_interface.init() != ERROR_OK)
                return ERROR_FAIL;
        if (versaloon_interface.usb_setting.buf_size < 32) {
                versaloon_interface.fini();
                return ERROR_FAIL;
        }
 
-       /* malloc buffer size for tap */
-       tap_buffer_size = versaloon_interface.usb_setting.buf_size / 2 - 32;
-       vsllink_free_buffer();
-       tdi_buffer = malloc(tap_buffer_size);
-       tdo_buffer = malloc(tap_buffer_size);
-       tms_buffer = malloc(tap_buffer_size);
-       if ((NULL == tdi_buffer) || (NULL == tdo_buffer) || (NULL == tms_buffer)) {
-               vsllink_quit();
-               return ERROR_FAIL;
-       }
+       return ERROR_OK;
+}
+
+static int vsllink_init(void)
+{
+       int retval = vsllink_interface_init();
+       if (retval != ERROR_OK)
+               return retval;
 
-       versaloon_interface.adaptors.jtag_raw.init(0);
-       versaloon_interface.adaptors.jtag_raw.config(0, jtag_get_speed_khz());
        versaloon_interface.adaptors.gpio.init(0);
-       versaloon_interface.adaptors.gpio.config(0, GPIO_SRST | GPIO_TRST,
-               GPIO_TRST, GPIO_SRST, GPIO_SRST);
-       if (ERROR_OK != versaloon_interface.adaptors.peripheral_commit())
+       versaloon_interface.adaptors.gpio.config(0, GPIO_SRST, 0, GPIO_SRST,
+               GPIO_SRST);
+       versaloon_interface.adaptors.delay.delayms(100);
+       versaloon_interface.adaptors.peripheral_commit();
+
+       if (swd_mode) {
+               versaloon_interface.adaptors.gpio.config(0, GPIO_TRST, 0,
+                       GPIO_TRST, GPIO_TRST);
+               versaloon_interface.adaptors.swd.init(0);
+               vsllink_swd_frequency(adapter_get_speed_khz() * 1000);
+               vsllink_swd_switch_seq(JTAG_TO_SWD);
+
+       } else {
+               /* malloc buffer size for tap */
+               tap_buffer_size = versaloon_interface.usb_setting.buf_size / 2 - 32;
+               vsllink_free_buffer();
+               tdi_buffer = malloc(tap_buffer_size);
+               tdo_buffer = malloc(tap_buffer_size);
+               tms_buffer = malloc(tap_buffer_size);
+               if ((!tdi_buffer) || (!tdo_buffer) || (!tms_buffer)) {
+                       vsllink_quit();
+                       return ERROR_FAIL;
+               }
+
+               versaloon_interface.adaptors.jtag_raw.init(0);
+               versaloon_interface.adaptors.jtag_raw.config(0, adapter_get_speed_khz());
+               versaloon_interface.adaptors.gpio.config(0, GPIO_SRST | GPIO_TRST,
+                       GPIO_TRST, GPIO_SRST, GPIO_SRST);
+       }
+
+       if (versaloon_interface.adaptors.peripheral_commit() != ERROR_OK)
                return ERROR_FAIL;
 
        vsllink_reset(0, 0);
@@ -433,7 +451,7 @@ static void vsllink_scan(bool ir_scan, enum scan_type type, uint8_t *buffer,
                vsllink_state_move();
 }
 
-static void vsllink_reset(int trst, int srst)
+static int vsllink_reset(int trst, int srst)
 {
        LOG_DEBUG("trst: %i, srst: %i", trst, srst);
 
@@ -442,11 +460,14 @@ static void vsllink_reset(int trst, int srst)
        else
                versaloon_interface.adaptors.gpio.config(0, GPIO_SRST, GPIO_SRST, 0, 0);
 
-       if (!trst)
-               versaloon_interface.adaptors.gpio.out(0, GPIO_TRST, GPIO_TRST);
-       else
-               versaloon_interface.adaptors.gpio.out(0, GPIO_TRST, 0);
-       versaloon_interface.adaptors.peripheral_commit();
+       if (!swd_mode) {
+               if (!trst)
+                       versaloon_interface.adaptors.gpio.out(0, GPIO_TRST, GPIO_TRST);
+               else
+                       versaloon_interface.adaptors.gpio.out(0, GPIO_TRST, 0);
+       }
+
+       return versaloon_interface.adaptors.peripheral_commit();
 }
 
 COMMAND_HANDLER(vsllink_handle_usb_vid_command)
@@ -468,21 +489,6 @@ COMMAND_HANDLER(vsllink_handle_usb_pid_command)
        return ERROR_OK;
 }
 
-COMMAND_HANDLER(vsllink_handle_usb_serial_command)
-{
-       if (CMD_ARGC > 1)
-               return ERROR_COMMAND_SYNTAX_ERROR;
-
-       free(versaloon_interface.usb_setting.serialstring);
-
-       if (CMD_ARGC == 1)
-               versaloon_interface.usb_setting.serialstring = strdup(CMD_ARGV[0]);
-       else
-               versaloon_interface.usb_setting.serialstring = NULL;
-
-       return ERROR_OK;
-}
-
 COMMAND_HANDLER(vsllink_handle_usb_bulkin_command)
 {
        if (CMD_ARGC != 1)
@@ -629,13 +635,11 @@ static int vsllink_jtag_execute(void)
                        command = pending_scan_result->command;
                        buf_set_buf(tdo_buffer, src_first, buffer, dest_first, length);
 
-#ifdef _DEBUG_JTAG_IO_
-                       DEBUG_JTAG_IO(
+                       LOG_DEBUG_IO(
                                "JTAG scan read(%d bits, from src %d bits to dest %d bits):",
                                length, src_first, dest_first);
-                       vsllink_debug_buffer(buffer + dest_first / 8,
-                               DIV_ROUND_UP(length, 7));
-#endif
+                       if (LOG_LEVEL_IS(LOG_LVL_DEBUG_IO))
+                               vsllink_debug_buffer(buffer + dest_first / 8, DIV_ROUND_UP(length, 7));
 
                        if (last) {
                                if (jtag_read_buffer(buffer, command)
@@ -644,8 +648,7 @@ static int vsllink_jtag_execute(void)
                                        return ERROR_JTAG_QUEUE_FAILED;
                                }
 
-                               if (pending_scan_result->buffer != NULL)
-                                       free(pending_scan_result->buffer);
+                               free(pending_scan_result->buffer);
                        }
                }
        } else {
@@ -660,143 +663,189 @@ static int vsllink_jtag_execute(void)
 
 static int vsllink_tap_execute(void)
 {
+       if (swd_mode)
+               return ERROR_OK;
+
        return vsllink_jtag_execute();
 }
 
-/****************************************************************************
- * VSLLink USB low-level functions */
+static int vsllink_swd_init(void)
+{
+       LOG_INFO("VSLLink SWD mode enabled");
+       swd_mode = true;
+
+       return ERROR_OK;
+}
 
-static uint8_t usb_check_string(usb_dev_handle *usb, uint8_t stringidx,
-       char *string, char *buff, uint16_t buf_size)
+static int_least32_t vsllink_swd_frequency(int_least32_t hz)
 {
-       int len;
-       uint8_t alloced = 0;
-       uint8_t ret = 1;
+       const int_least32_t delay2hz[] = {
+               1850000, 235000, 130000, 102000, 85000, 72000
+       };
 
-       if (NULL == buff) {
-               buf_size = 256;
-               buff = malloc(buf_size);
-               if (NULL == buff) {
-                       ret = 0;
-                       goto free_and_return;
+       if (hz > 0) {
+               uint16_t delay = UINT16_MAX;
+
+               for (uint16_t i = 0; i < ARRAY_SIZE(delay2hz); i++) {
+                       if (hz >= delay2hz[i]) {
+                               hz = delay2hz[i];
+                               delay = i;
+                               break;
+                       }
                }
-               alloced = 1;
-       }
 
-       strcpy(buff, "");
-       len = usb_get_string_simple(usb, stringidx, buff, buf_size);
-       if ((len < 0) || ((size_t)len != strlen(buff))) {
-               ret = 0;
-               goto free_and_return;
-       }
+               if (delay == UINT16_MAX)
+                       delay = (500000 / hz) - 1;
+
+               /* Calculate retry count after a WAIT response. This will give
+                * a retry timeout at about ~250 ms. 54 is the number of bits
+                * found in a transaction. */
+               uint16_t retry_count = 250 * hz / 1000 / 54;
+
+               LOG_DEBUG("SWD delay: %d, retry count: %d", delay, retry_count);
 
-       buff[len] = '\0';
-       if ((string != NULL) && strcmp(buff, string)) {
-               ret = 0;
-               goto free_and_return;
+               versaloon_interface.adaptors.swd.config(0, 2, retry_count, delay);
        }
 
-free_and_return:
-       if (alloced && (buff != NULL)) {
-               free(buff);
-               buff = NULL;
+       return hz;
+}
+
+static int vsllink_swd_switch_seq(enum swd_special_seq seq)
+{
+       switch (seq) {
+       case LINE_RESET:
+               LOG_DEBUG("SWD line reset");
+               versaloon_interface.adaptors.swd.seqout(0, swd_seq_line_reset,
+                               swd_seq_line_reset_len);
+               break;
+       case JTAG_TO_SWD:
+               LOG_DEBUG("JTAG-to-SWD");
+               versaloon_interface.adaptors.swd.seqout(0, swd_seq_jtag_to_swd,
+                               swd_seq_jtag_to_swd_len);
+               break;
+       case SWD_TO_JTAG:
+               LOG_DEBUG("SWD-to-JTAG");
+               versaloon_interface.adaptors.swd.seqout(0, swd_seq_swd_to_jtag,
+                               swd_seq_swd_to_jtag_len);
+               break;
+       default:
+               LOG_ERROR("Sequence %d not supported", seq);
+               return ERROR_FAIL;
        }
-       return ret;
-}
-
-static usb_dev_handle *find_usb_device(uint16_t VID, uint16_t PID, uint8_t interface,
-               char *serialstring, char *productstring)
-{
-       usb_dev_handle *dev_handle = NULL;
-       struct usb_bus *busses;
-       struct usb_bus *bus;
-       struct usb_device *dev;
-
-       usb_init();
-       usb_find_busses();
-       usb_find_devices();
-       busses = usb_get_busses();
-
-       for (bus = busses; bus; bus = bus->next) {
-               for (dev = bus->devices; dev; dev = dev->next) {
-                       if ((dev->descriptor.idVendor == VID)
-                           && (dev->descriptor.idProduct == PID)) {
-                               dev_handle = usb_open(dev);
-                               if (NULL == dev_handle) {
-                                       LOG_ERROR("failed to open %04X:%04X, %s", VID, PID,
-                                               usb_strerror());
-                                       continue;
-                               }
 
-                               /* check description string */
-                               if ((productstring != NULL && !usb_check_string(dev_handle,
-                                               dev->descriptor.iProduct, productstring, NULL, 0))
-                                       || (serialstring != NULL && !usb_check_string(dev_handle,
-                                                               dev->descriptor.iSerialNumber, serialstring, NULL, 0))) {
-                                       usb_close(dev_handle);
-                                       dev_handle = NULL;
-                                       continue;
-                               }
+       return ERROR_OK;
+}
 
-                               if (usb_claim_interface(dev_handle, interface) != 0) {
-                                       LOG_ERROR(ERRMSG_FAILURE_OPERATION_MESSAGE,
-                                               "claim interface", usb_strerror());
-                                       usb_close(dev_handle);
-                                       dev_handle = NULL;
-                                       continue;
-                               }
+static void vsllink_swd_read_reg(uint8_t cmd, uint32_t *value, uint32_t ap_delay_clk)
+{
+       versaloon_interface.adaptors.swd.transact(0, cmd, value, NULL);
+}
 
-                               if (dev_handle != NULL)
-                                       return dev_handle;
-                       }
-               }
-       }
+static void vsllink_swd_write_reg(uint8_t cmd, uint32_t value, uint32_t ap_delay_clk)
+{
+       versaloon_interface.adaptors.swd.transact(0, cmd, &value, NULL);
+}
 
-       return dev_handle;
+static int vsllink_swd_run_queue(void)
+{
+       return versaloon_interface.adaptors.peripheral_commit();
 }
 
-static struct vsllink *vsllink_usb_open(void)
+/****************************************************************************
+ * VSLLink USB low-level functions */
+
+static int vsllink_check_usb_strings(
+       struct libusb_device_handle *usb_device_handle,
+       struct libusb_device_descriptor *usb_desc)
 {
-       usb_init();
+       char desc_string[256];
+       int retval;
 
-       struct usb_dev_handle *dev;
+       if (adapter_get_required_serial()) {
+               retval = libusb_get_string_descriptor_ascii(usb_device_handle,
+                       usb_desc->iSerialNumber, (unsigned char *)desc_string,
+                       sizeof(desc_string));
+               if (retval < 0)
+                       return ERROR_FAIL;
 
-       dev = find_usb_device(versaloon_interface.usb_setting.vid,
-                       versaloon_interface.usb_setting.pid,
-                       versaloon_interface.usb_setting.interface,
-                       versaloon_interface.usb_setting.serialstring, "Versaloon");
-       if (NULL == dev)
-               return NULL;
+               if (strncmp(desc_string, adapter_get_required_serial(),
+                               sizeof(desc_string)))
+                       return ERROR_FAIL;
+       }
 
-       struct vsllink *result = malloc(sizeof(struct vsllink));
-       result->usb_handle = dev;
-       return result;
+       retval = libusb_get_string_descriptor_ascii(usb_device_handle,
+               usb_desc->iProduct, (unsigned char *)desc_string,
+               sizeof(desc_string));
+       if (retval < 0)
+               return ERROR_FAIL;
+
+       if (!strstr(desc_string, "Versaloon"))
+               return ERROR_FAIL;
+
+       return ERROR_OK;
 }
 
-static void vsllink_usb_close(struct vsllink *vsllink)
+static int vsllink_usb_open(struct vsllink *vsllink)
 {
-       int ret;
+       ssize_t num_devices, i;
+       struct libusb_device **usb_devices;
+       struct libusb_device_descriptor usb_desc;
+       struct libusb_device_handle *usb_device_handle;
+       int retval;
 
-       ret = usb_release_interface(vsllink->usb_handle,
-                       versaloon_interface.usb_setting.interface);
-       if (ret != 0) {
-               LOG_ERROR("fail to release interface %d, %d returned",
-                       versaloon_interface.usb_setting.interface, ret);
-               exit(-1);
+       num_devices = libusb_get_device_list(vsllink->libusb_ctx, &usb_devices);
+
+       if (num_devices <= 0)
+               return ERROR_FAIL;
+
+       for (i = 0; i < num_devices; i++) {
+               struct libusb_device *device = usb_devices[i];
+
+               retval = libusb_get_device_descriptor(device, &usb_desc);
+               if (retval != 0)
+                       continue;
+
+               if (usb_desc.idVendor != versaloon_interface.usb_setting.vid ||
+                       usb_desc.idProduct != versaloon_interface.usb_setting.pid)
+                       continue;
+
+               retval = libusb_open(device, &usb_device_handle);
+               if (retval != 0)
+                       continue;
+
+               retval = vsllink_check_usb_strings(usb_device_handle, &usb_desc);
+               if (retval == ERROR_OK)
+                       break;
+
+               libusb_close(usb_device_handle);
        }
 
-       ret = usb_close(vsllink->usb_handle);
-       if (ret != 0) {
-               LOG_ERROR("fail to close usb, %d returned", ret);
-               exit(-1);
+       libusb_free_device_list(usb_devices, 1);
+
+       if (i == num_devices)
+               return ERROR_FAIL;
+
+       retval = libusb_claim_interface(usb_device_handle,
+               versaloon_interface.usb_setting.interface);
+       if (retval != 0) {
+               LOG_ERROR("unable to claim interface");
+               libusb_close(usb_device_handle);
+               return ERROR_FAIL;
        }
 
-       free(vsllink);
+       vsllink->usb_device_handle = usb_device_handle;
+       return ERROR_OK;
+}
+
+static void vsllink_usb_close(struct vsllink *vsllink)
+{
+       libusb_release_interface(vsllink->usb_device_handle,
+               versaloon_interface.usb_setting.interface);
+       libusb_close(vsllink->usb_device_handle);
 }
 
 #define BYTES_PER_LINE  16
 
-#if defined _DEBUG_JTAG_IO_
 static void vsllink_debug_buffer(uint8_t *buffer, int length)
 {
        char line[81];
@@ -805,62 +854,92 @@ static void vsllink_debug_buffer(uint8_t *buffer, int length)
        int j;
 
        for (i = 0; i < length; i += BYTES_PER_LINE) {
-               snprintf(line, 5, "%04x", i);
+               snprintf(line, 5, "%04x", i & 0xffff);
                for (j = i; j < i + BYTES_PER_LINE && j < length; j++) {
                        snprintf(s, 4, " %02x", buffer[j]);
                        strcat(line, s);
                }
-               LOG_DEBUG("%s", line);
+               LOG_DEBUG_IO("%s", line);
        }
 }
-#endif /* _DEBUG_JTAG_IO_ */
 
-static const struct command_registration vsllink_command_handlers[] = {
+static const struct command_registration vsllink_subcommand_handlers[] = {
        {
-               .name = "vsllink_usb_vid",
+               .name = "usb_vid",
                .handler = &vsllink_handle_usb_vid_command,
                .mode = COMMAND_CONFIG,
+               .help = "Set USB VID",
+               .usage = "<vid>",
        },
        {
-               .name = "vsllink_usb_pid",
+               .name = "usb_pid",
                .handler = &vsllink_handle_usb_pid_command,
                .mode = COMMAND_CONFIG,
+               .help = "Set USB PID",
+               .usage = "<pid>",
        },
        {
-               .name = "vsllink_usb_serial",
-               .handler = &vsllink_handle_usb_serial_command,
-               .mode = COMMAND_CONFIG,
-       },
-       {
-               .name = "vsllink_usb_bulkin",
+               .name = "usb_bulkin",
                .handler = &vsllink_handle_usb_bulkin_command,
                .mode = COMMAND_CONFIG,
+               .help = "Set USB input endpoint",
+               .usage = "<ep_in>",
        },
        {
-               .name = "vsllink_usb_bulkout",
+               .name = "usb_bulkout",
                .handler = &vsllink_handle_usb_bulkout_command,
                .mode = COMMAND_CONFIG,
+               .help = "Set USB output endpoint",
+               .usage = "<ep_out>",
        },
        {
-               .name = "vsllink_usb_interface",
+               .name = "usb_interface",
                .handler = &vsllink_handle_usb_interface_command,
                .mode = COMMAND_CONFIG,
+               .help = "Set USB output interface",
+               .usage = "<interface>",
+       },
+       COMMAND_REGISTRATION_DONE
+};
+
+static const struct command_registration vsllink_command_handlers[] = {
+       {
+               .name = "vsllink",
+               .mode = COMMAND_ANY,
+               .help = "perform vsllink management",
+               .chain = vsllink_subcommand_handlers,
+               .usage = "",
        },
        COMMAND_REGISTRATION_DONE
 };
 
-static const char *vsllink_transports[] = {"jtag", "swd", NULL};
+static const char * const vsllink_transports[] = {"jtag", "swd", NULL};
 
-struct jtag_interface vsllink_interface = {
-       .name = "vsllink",
+static const struct swd_driver vsllink_swd_driver = {
+       .init = vsllink_swd_init,
+       .switch_seq = vsllink_swd_switch_seq,
+       .read_reg = vsllink_swd_read_reg,
+       .write_reg = vsllink_swd_write_reg,
+       .run = vsllink_swd_run_queue,
+};
+
+static struct jtag_interface vsllink_interface = {
        .supported = DEBUG_CAP_TMS_SEQ,
-       .commands = vsllink_command_handlers,
+       .execute_queue = vsllink_execute_queue,
+};
+
+struct adapter_driver vsllink_adapter_driver = {
+       .name = "vsllink",
        .transports = vsllink_transports,
+       .commands = vsllink_command_handlers,
 
        .init = vsllink_init,
        .quit = vsllink_quit,
-       .khz = vsllink_khz,
+       .reset = vsllink_reset,
        .speed = vsllink_speed,
+       .khz = vsllink_khz,
        .speed_div = vsllink_speed_div,
-       .execute_queue = vsllink_execute_queue,
+
+       .jtag_ops = &vsllink_interface,
+       .swd_ops = &vsllink_swd_driver,
 };

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