ft2232.c

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/***************************************************************************
*   Copyright (C) 2009 by Øyvind Harboe                                   *
*   Øyvind Harboe <oyvind.harboe@zylin.com>                               *
*                                                                         *
*   Copyright (C) 2009 by SoftPLC Corporation.  http://softplc.com        *
*   Dick Hollenbeck <dick@softplc.com>                                    *
*                                                                         *
*   Copyright (C) 2004, 2006 by Dominic Rath                              *
*   Dominic.Rath@gmx.de                                                   *
*                                                                         *
*   Copyright (C) 2008 by Spencer Oliver                                  *
*   spen@spen-soft.co.uk                                                  *
*                                                                         *
*   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

/* project specific includes */
#include <jtag/interface.h>
#include <transport/transport.h>
#include <helper/time_support.h>

#if IS_CYGWIN == 1
#include <windows.h>
#endif

#include <assert.h>

#if (BUILD_FT2232_FTD2XX == 1 && BUILD_FT2232_LIBFTDI == 1)
#error "BUILD_FT2232_FTD2XX && BUILD_FT2232_LIBFTDI are mutually exclusive"
#elif (BUILD_FT2232_FTD2XX != 1 && BUILD_FT2232_LIBFTDI != 1)
#error "BUILD_FT2232_FTD2XX || BUILD_FT2232_LIBFTDI must be chosen"
#endif

/* FT2232 access library includes */
#if BUILD_FT2232_FTD2XX == 1
#include <ftd2xx.h>
#include "ftd2xx_common.h"

enum ftdi_interface {
    INTERFACE_ANY = 0,
    INTERFACE_A   = 1,
    INTERFACE_B   = 2,
    INTERFACE_C   = 3,
    INTERFACE_D   = 4
};

#elif BUILD_FT2232_LIBFTDI == 1
#include <ftdi.h>
#endif

/* max TCK for the high speed devices 30000 kHz */
#define FTDI_x232H_MAX_TCK  30000
/* max TCK for the full speed devices 6000 kHz */
#define FTDI_2232C_MAX_TCK 6000
/* this speed value tells that RTCK is requested */
#define RTCK_SPEED -1

/*
 * On my Athlon XP 1900+ EHCI host with FT2232H JTAG dongle I get read timeout
 * errors with a retry count of 100. Increasing it solves the problem for me.
 *  - Dimitar
 *
 * FIXME There's likely an issue with the usb_read_timeout from libftdi.
 * Fix that (libusb? kernel? libftdi? here?) and restore the retry count
 * to something sane.
 */
#define LIBFTDI_READ_RETRY_COUNT        2000

#ifndef BUILD_FT2232_HIGHSPEED
 #if BUILD_FT2232_FTD2XX == 1
    enum { FT_DEVICE_2232H = 6, FT_DEVICE_4232H, FT_DEVICE_232H };
 #elif BUILD_FT2232_LIBFTDI == 1
    enum ftdi_chip_type { TYPE_2232H = 4, TYPE_4232H = 5, TYPE_232H = 6 };
 #endif
#endif

static int ft2232_stableclocks(int num_cycles, struct jtag_command *cmd);

static char *ft2232_device_desc_A;
static char *ft2232_device_desc;
static char *ft2232_serial;
static uint8_t ft2232_latency = 2;
static unsigned ft2232_max_tck = FTDI_2232C_MAX_TCK;
static int ft2232_channel = INTERFACE_ANY;

#define MAX_USB_IDS 8
/* vid = pid = 0 marks the end of the list */
static uint16_t ft2232_vid[MAX_USB_IDS + 1] = { 0x0403, 0 };
static uint16_t ft2232_pid[MAX_USB_IDS + 1] = { 0x6010, 0 };

struct ft2232_layout {
    const char *name;
    int (*init)(void);
    void (*reset)(int trst, int srst);
    void (*blink)(void);
    int channel;
};

/* init procedures for supported layouts */
static int usbjtag_init(void);
static int jtagkey_init(void);
static int lm3s811_jtag_init(void);
static int icdi_jtag_init(void);
static int olimex_jtag_init(void);
static int flyswatter1_init(void);
static int flyswatter2_init(void);
static int minimodule_init(void);
static int turtle_init(void);
static int comstick_init(void);
static int stm32stick_init(void);
static int axm0432_jtag_init(void);
static int sheevaplug_init(void);
static int icebear_jtag_init(void);
static int cortino_jtag_init(void);
static int signalyzer_init(void);
static int signalyzer_h_init(void);
static int ktlink_init(void);
static int redbee_init(void);
static int lisa_l_init(void);
static int flossjtag_init(void);
static int xds100v2_init(void);
static int digilent_hs1_init(void);

/* reset procedures for supported layouts */
static void ftx23_reset(int trst, int srst);
static void jtagkey_reset(int trst, int srst);
static void olimex_jtag_reset(int trst, int srst);
static void flyswatter1_reset(int trst, int srst);
static void flyswatter2_reset(int trst, int srst);
static void minimodule_reset(int trst, int srst);
static void turtle_reset(int trst, int srst);
static void comstick_reset(int trst, int srst);
static void stm32stick_reset(int trst, int srst);
static void axm0432_jtag_reset(int trst, int srst);
static void sheevaplug_reset(int trst, int srst);
static void icebear_jtag_reset(int trst, int srst);
static void signalyzer_h_reset(int trst, int srst);
static void ktlink_reset(int trst, int srst);
static void redbee_reset(int trst, int srst);
static void xds100v2_reset(int trst, int srst);
static void digilent_hs1_reset(int trst, int srst);

/* blink procedures for layouts that support a blinking led */
static void olimex_jtag_blink(void);
static void flyswatter1_jtag_blink(void);
static void flyswatter2_jtag_blink(void);
static void turtle_jtag_blink(void);
static void signalyzer_h_blink(void);
static void ktlink_blink(void);
static void lisa_l_blink(void);
static void flossjtag_blink(void);

/* common transport support options */

/* static const char *jtag_and_swd[] = { "jtag", "swd", NULL }; */

static const struct ft2232_layout  ft2232_layouts[] = {
    { .name = "usbjtag",
        .init = usbjtag_init,
        .reset = ftx23_reset,
    },
    { .name = "jtagkey",
        .init = jtagkey_init,
        .reset = jtagkey_reset,
    },
    { .name = "jtagkey_prototype_v1",
        .init = jtagkey_init,
        .reset = jtagkey_reset,
    },
    { .name = "oocdlink",
        .init = jtagkey_init,
        .reset = jtagkey_reset,
    },
    { .name = "signalyzer",
        .init = signalyzer_init,
        .reset = ftx23_reset,
    },
    { .name = "evb_lm3s811",
        .init = lm3s811_jtag_init,
        .reset = ftx23_reset,
    },
    { .name = "luminary_icdi",
        .init = icdi_jtag_init,
        .reset = ftx23_reset,
    },
    { .name = "olimex-jtag",
        .init = olimex_jtag_init,
        .reset = olimex_jtag_reset,
        .blink = olimex_jtag_blink
    },
    { .name = "flyswatter",
        .init = flyswatter1_init,
        .reset = flyswatter1_reset,
        .blink = flyswatter1_jtag_blink
    },
    { .name = "flyswatter2",
        .init = flyswatter2_init,
        .reset = flyswatter2_reset,
        .blink = flyswatter2_jtag_blink
    },
    { .name = "minimodule",
        .init = minimodule_init,
        .reset = minimodule_reset,
    },
    { .name = "turtelizer2",
        .init = turtle_init,
        .reset = turtle_reset,
        .blink = turtle_jtag_blink
    },
    { .name = "comstick",
        .init = comstick_init,
        .reset = comstick_reset,
    },
    { .name = "stm32stick",
        .init = stm32stick_init,
        .reset = stm32stick_reset,
    },
    { .name = "axm0432_jtag",
        .init = axm0432_jtag_init,
        .reset = axm0432_jtag_reset,
    },
    { .name = "sheevaplug",
        .init = sheevaplug_init,
        .reset = sheevaplug_reset,
    },
    { .name = "icebear",
        .init = icebear_jtag_init,
        .reset = icebear_jtag_reset,
    },
    { .name = "cortino",
        .init = cortino_jtag_init,
        .reset = comstick_reset,
    },
    { .name = "signalyzer-h",
        .init = signalyzer_h_init,
        .reset = signalyzer_h_reset,
        .blink = signalyzer_h_blink
    },
    { .name = "ktlink",
        .init = ktlink_init,
        .reset = ktlink_reset,
        .blink = ktlink_blink
    },
    { .name = "redbee-econotag",
        .init = redbee_init,
        .reset = redbee_reset,
    },
    { .name = "redbee-usb",
        .init = redbee_init,
        .reset = redbee_reset,
        .channel = INTERFACE_B,
    },
    { .name = "lisa-l",
        .init = lisa_l_init,
        .reset = ftx23_reset,
        .blink = lisa_l_blink,
        .channel = INTERFACE_B,
    },
    { .name = "flossjtag",
        .init = flossjtag_init,
        .reset = ftx23_reset,
        .blink = flossjtag_blink,
    },
    { .name = "xds100v2",
        .init = xds100v2_init,
        .reset = xds100v2_reset,
    },
    { .name = "digilent-hs1",
        .init = digilent_hs1_init,
        .reset = digilent_hs1_reset,
        .channel = INTERFACE_A,
    },
    { .name = NULL, /* END OF TABLE */ },
};

/* bitmask used to drive nTRST; usually a GPIOLx signal */
static uint8_t nTRST;
static uint8_t nTRSTnOE;
/* bitmask used to drive nSRST; usually a GPIOLx signal */
static uint8_t nSRST;
static uint8_t nSRSTnOE;

static const struct ft2232_layout *layout;

static uint8_t low_output;

/* note that direction bit == 1 means that signal is an output */

static uint8_t low_direction;
static uint8_t high_output;
static uint8_t high_direction;

#if BUILD_FT2232_FTD2XX == 1
static FT_HANDLE ftdih;
static FT_DEVICE ftdi_device;
#elif BUILD_FT2232_LIBFTDI == 1
static struct ftdi_context ftdic;
static enum ftdi_chip_type ftdi_device;
#endif

static struct jtag_command *first_unsent;   /* next command that has to be sent */
static int require_send;

/*  http://urjtag.wiki.sourceforge.net/Cable + FT2232 says:

    "There is a significant difference between libftdi and libftd2xx. The latter
    one allows to schedule up to 64*64 bytes of result data while libftdi fails
    with more than 4*64. As a consequence, the FT2232 driver is forced to
    perform around 16x more USB transactions for long command streams with TDO
    capture when running with libftdi."

    No idea how we get
    #define FT2232_BUFFER_SIZE 131072
    a comment would have been nice.
*/

#if BUILD_FT2232_FTD2XX == 1
#define FT2232_BUFFER_READ_QUEUE_SIZE (64*64)
#else
#define FT2232_BUFFER_READ_QUEUE_SIZE (64*4)
#endif

#define FT2232_BUFFER_SIZE 131072

static uint8_t *ft2232_buffer;
static int ft2232_buffer_size;
static int ft2232_read_pointer;
static int ft2232_expect_read;

static inline void buffer_write(uint8_t val)
{
    assert(ft2232_buffer);
    assert((unsigned) ft2232_buffer_size < (unsigned) FT2232_BUFFER_SIZE);
    ft2232_buffer[ft2232_buffer_size++] = val;
}

static inline uint8_t buffer_read(void)
{
    assert(ft2232_buffer);
    assert(ft2232_read_pointer < ft2232_buffer_size);
    return ft2232_buffer[ft2232_read_pointer++];
}

static void clock_tms(uint8_t mpsse_cmd, int tms_bits, int tms_count, bool tdi_bit)
{
    uint8_t tms_byte;
    int i;
    int tms_ndx;    /* bit index into tms_byte */

    assert(tms_count > 0);

    DEBUG_JTAG_IO("mpsse cmd=%02x, tms_bits = 0x%08x, bit_count=%d",
        mpsse_cmd, tms_bits, tms_count);

    for (tms_byte = tms_ndx = i = 0; i < tms_count; ++i, tms_bits >>= 1) {
        bool bit = tms_bits & 1;

        if (bit)
            tms_byte |= (1 << tms_ndx);

        /* always do state transitions in public view */
        tap_set_state(tap_state_transition(tap_get_state(), bit));

        /*  we wrote a bit to tms_byte just above, increment bit index.  if bit was zero
         * also increment.
        */
        ++tms_ndx;

        if (tms_ndx == 7 || i == tms_count-1) {
            buffer_write(mpsse_cmd);
            buffer_write(tms_ndx - 1);

            /*  Bit 7 of the byte is passed on to TDI/DO before the first TCK/SK of
             * TMS/CS and is held static for the duration of TMS/CS clocking.
            */
            buffer_write(tms_byte | (tdi_bit << 7));
        }
    }
}

static inline int get_tms_buffer_requirements(int bit_count)
{
    return ((bit_count + 6)/7) * 3;
}

static void move_to_state(tap_state_t goal_state)
{
    tap_state_t start_state = tap_get_state();

    /*  goal_state is 1/2 of a tuple/pair of states which allow convenient
     * lookup of the required TMS pattern to move to this state from the start state.
    */

    /* do the 2 lookups */
    int tms_bits  = tap_get_tms_path(start_state, goal_state);
    int tms_count = tap_get_tms_path_len(start_state, goal_state);

    DEBUG_JTAG_IO("start=%s goal=%s", tap_state_name(start_state), tap_state_name(goal_state));

    clock_tms(0x4b,  tms_bits, tms_count, 0);
}

static int ft2232_write(uint8_t *buf, int size, uint32_t *bytes_written)
{
#if BUILD_FT2232_FTD2XX == 1
    FT_STATUS status;
    DWORD dw_bytes_written = 0;
    status = FT_Write(ftdih, buf, size, &dw_bytes_written);
    if (status != FT_OK) {
        *bytes_written = dw_bytes_written;
        LOG_ERROR("FT_Write returned: %s", ftd2xx_status_string(status));
        return ERROR_JTAG_DEVICE_ERROR;
    } else
        *bytes_written = dw_bytes_written;

#elif BUILD_FT2232_LIBFTDI == 1
    int retval = ftdi_write_data(&ftdic, buf, size);
    if (retval < 0) {
        *bytes_written = 0;
        LOG_ERROR("ftdi_write_data: %s", ftdi_get_error_string(&ftdic));
        return ERROR_JTAG_DEVICE_ERROR;
    } else
        *bytes_written = retval;

#endif

    if (*bytes_written != (uint32_t)size)
        return ERROR_JTAG_DEVICE_ERROR;

    return ERROR_OK;
}

static int ft2232_read(uint8_t *buf, uint32_t size, uint32_t *bytes_read)
{
#if BUILD_FT2232_FTD2XX == 1
    DWORD dw_bytes_read;
    FT_STATUS status;
    int timeout = 5;
    *bytes_read = 0;

    while ((*bytes_read < size) && timeout--) {
        status = FT_Read(ftdih, buf + *bytes_read, size -
                *bytes_read, &dw_bytes_read);
        if (status != FT_OK) {
            *bytes_read = 0;
            LOG_ERROR("FT_Read returned: %s", ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }
        *bytes_read += dw_bytes_read;
    }

#elif BUILD_FT2232_LIBFTDI == 1
    int retval;
    int timeout = LIBFTDI_READ_RETRY_COUNT;
    *bytes_read = 0;

    while ((*bytes_read < size) && timeout--) {
        retval = ftdi_read_data(&ftdic, buf + *bytes_read, size - *bytes_read);
        if (retval < 0) {
            *bytes_read = 0;
            LOG_ERROR("ftdi_read_data: %s", ftdi_get_error_string(&ftdic));
            return ERROR_JTAG_DEVICE_ERROR;
        }
        *bytes_read += retval;
    }

#endif

    if (*bytes_read < size) {
        LOG_ERROR("couldn't read enough bytes from "
            "FT2232 device (%i < %i)",
            (unsigned)*bytes_read,
            (unsigned)size);
        return ERROR_JTAG_DEVICE_ERROR;
    }

    return ERROR_OK;
}

static bool ft2232_device_is_highspeed(void)
{
#if BUILD_FT2232_FTD2XX == 1
    return (ftdi_device == FT_DEVICE_2232H) || (ftdi_device == FT_DEVICE_4232H)
 #ifdef HAS_ENUM_FT232H
        || (ftdi_device == FT_DEVICE_232H)
 #endif
    ;
#elif BUILD_FT2232_LIBFTDI == 1
    return (ftdi_device == TYPE_2232H || ftdi_device == TYPE_4232H
 #ifdef HAS_ENUM_FT232H
        || ftdi_device == TYPE_232H
 #endif
    );
#endif
}

/*
 * Commands that only apply to the highspeed FTx232H devices (FT2232H, FT4232H, FT232H).
 * See chapter 6 in http://www.ftdichip.com/Documents/AppNotes/
 * AN_108_Command_Processor_for_MPSSE_and_MCU_Host_Bus_Emulation_Modes.pdf
 */

static int ftx232h_adaptive_clocking(bool enable)
{
    uint8_t buf = enable ? 0x96 : 0x97;
    LOG_DEBUG("%2.2x", buf);

    uint32_t bytes_written;
    int retval;

    retval = ft2232_write(&buf, sizeof(buf), &bytes_written);
    if (retval != ERROR_OK) {
        LOG_ERROR("couldn't write command to %s adaptive clocking"
            , enable ? "enable" : "disable");
        return retval;
    }

    return ERROR_OK;
}

static int ftx232h_clk_divide_by_5(bool enable)
{
    uint32_t bytes_written;
    uint8_t buf = enable ?  0x8b : 0x8a;

    if (ft2232_write(&buf, sizeof(buf), &bytes_written) != ERROR_OK) {
        LOG_ERROR("couldn't write command to %s clk divide by 5"
            , enable ? "enable" : "disable");
        return ERROR_JTAG_INIT_FAILED;
    }
    ft2232_max_tck = enable ? FTDI_2232C_MAX_TCK : FTDI_x232H_MAX_TCK;
    LOG_INFO("max TCK change to: %u kHz", ft2232_max_tck);

    return ERROR_OK;
}

static int ft2232_speed(int speed)
{
    uint8_t buf[3];
    int retval;
    uint32_t bytes_written;

    retval = ERROR_OK;
    bool enable_adaptive_clocking = (RTCK_SPEED == speed);
    if (ft2232_device_is_highspeed())
        retval = ftx232h_adaptive_clocking(enable_adaptive_clocking);
    else if (enable_adaptive_clocking) {
        LOG_ERROR("ft2232 device %lu does not support RTCK"
            , (long unsigned int)ftdi_device);
        return ERROR_FAIL;
    }

    if ((enable_adaptive_clocking) || (ERROR_OK != retval))
        return retval;

    buf[0] = 0x86;                  /* command "set divisor" */
    buf[1] = speed & 0xff;          /* valueL (0 = 6MHz, 1 = 3MHz, 2 = 2.0MHz, ...*/
    buf[2] = (speed >> 8) & 0xff;   /* valueH */

    LOG_DEBUG("%2.2x %2.2x %2.2x", buf[0], buf[1], buf[2]);
    retval = ft2232_write(buf, sizeof(buf), &bytes_written);
    if (retval != ERROR_OK) {
        LOG_ERROR("couldn't set FT2232 TCK speed");
        return retval;
    }

    return ERROR_OK;
}

static int ft2232_speed_div(int speed, int *khz)
{
    /* Take a look in the FT2232 manual,
     * AN2232C-01 Command Processor for
     * MPSSE and MCU Host Bus. Chapter 3.8 */

    *khz = (RTCK_SPEED == speed) ? 0 : ft2232_max_tck / (1 + speed);

    return ERROR_OK;
}

static int ft2232_khz(int khz, int *jtag_speed)
{
    if (khz == 0) {
        if (ft2232_device_is_highspeed()) {
            *jtag_speed = RTCK_SPEED;
            return ERROR_OK;
        } else {
            LOG_DEBUG("RCLK not supported");
            return ERROR_FAIL;
        }
    }

    /* Take a look in the FT2232 manual,
     * AN2232C-01 Command Processor for
     * MPSSE and MCU Host Bus. Chapter 3.8
     *
     * We will calc here with a multiplier
     * of 10 for better rounding later. */

    /* Calc speed, (ft2232_max_tck / khz) - 1
     * Use 65000 for better rounding */
    *jtag_speed = ((ft2232_max_tck*10) / khz) - 10;

    /* Add 0.9 for rounding */
    *jtag_speed += 9;

    /* Calc real speed */
    *jtag_speed = *jtag_speed / 10;

    /* Check if speed is greater than 0 */
    if (*jtag_speed < 0)
        *jtag_speed = 0;

    /* Check max value */
    if (*jtag_speed > 0xFFFF)
        *jtag_speed = 0xFFFF;

    return ERROR_OK;
}

static void ft2232_end_state(tap_state_t state)
{
    if (tap_is_state_stable(state))
        tap_set_end_state(state);
    else {
        LOG_ERROR("BUG: %s is not a stable end state", tap_state_name(state));
        exit(-1);
    }
}

static void ft2232_read_scan(enum scan_type type, uint8_t *buffer, int scan_size)
{
    int num_bytes = (scan_size + 7) / 8;
    int bits_left = scan_size;
    int cur_byte  = 0;

    while (num_bytes-- > 1) {
        buffer[cur_byte++] = buffer_read();
        bits_left -= 8;
    }

    buffer[cur_byte] = 0x0;

    /* There is one more partial byte left from the clock data in/out instructions */
    if (bits_left > 1)
        buffer[cur_byte] = buffer_read() >> 1;
    /* This shift depends on the length of the
     *clock data to tms instruction, insterted
     *at end of the scan, now fixed to a two
     *step transition in ft2232_add_scan */
    buffer[cur_byte] = (buffer[cur_byte] | (((buffer_read()) << 1) & 0x80)) >> (8 - bits_left);
}

static void ft2232_debug_dump_buffer(void)
{
    int i;
    char line[256];
    char *line_p = line;

    for (i = 0; i < ft2232_buffer_size; i++) {
        line_p += snprintf(line_p,
                sizeof(line) - (line_p - line),
                "%2.2x ",
                ft2232_buffer[i]);
        if (i % 16 == 15) {
            LOG_DEBUG("%s", line);
            line_p = line;
        }
    }

    if (line_p != line)
        LOG_DEBUG("%s", line);
}

static int ft2232_send_and_recv(struct jtag_command *first, struct jtag_command *last)
{
    struct jtag_command *cmd;
    uint8_t *buffer;
    int scan_size;
    enum scan_type type;
    int retval;
    uint32_t bytes_written = 0;
    uint32_t bytes_read = 0;

#ifdef _DEBUG_USB_IO_
    struct timeval start, inter, inter2, end;
    struct timeval d_inter, d_inter2, d_end;
#endif

#ifdef _DEBUG_USB_COMMS_
    LOG_DEBUG("write buffer (size %i):", ft2232_buffer_size);
    ft2232_debug_dump_buffer();
#endif

#ifdef _DEBUG_USB_IO_
    gettimeofday(&start, NULL);
#endif

    retval = ft2232_write(ft2232_buffer, ft2232_buffer_size, &bytes_written);
    if (retval != ERROR_OK) {
        LOG_ERROR("couldn't write MPSSE commands to FT2232");
        return retval;
    }

#ifdef _DEBUG_USB_IO_
    gettimeofday(&inter, NULL);
#endif

    if (ft2232_expect_read) {
        /* FIXME this "timeout" is never changed ... */
        int timeout = LIBFTDI_READ_RETRY_COUNT;
        ft2232_buffer_size = 0;

#ifdef _DEBUG_USB_IO_
        gettimeofday(&inter2, NULL);
#endif

        retval = ft2232_read(ft2232_buffer, ft2232_expect_read, &bytes_read);
        if (retval != ERROR_OK) {
            LOG_ERROR("couldn't read from FT2232");
            return retval;
        }

#ifdef _DEBUG_USB_IO_
        gettimeofday(&end, NULL);

        timeval_subtract(&d_inter, &inter, &start);
        timeval_subtract(&d_inter2, &inter2, &start);
        timeval_subtract(&d_end, &end, &start);

        LOG_INFO("inter: %u.%06u, inter2: %u.%06u end: %u.%06u",
            (unsigned)d_inter.tv_sec, (unsigned)d_inter.tv_usec,
            (unsigned)d_inter2.tv_sec, (unsigned)d_inter2.tv_usec,
            (unsigned)d_end.tv_sec, (unsigned)d_end.tv_usec);
#endif

        ft2232_buffer_size = bytes_read;

        if (ft2232_expect_read != ft2232_buffer_size) {
            LOG_ERROR("ft2232_expect_read (%i) != "
                "ft2232_buffer_size (%i) "
                "(%i retries)",
                ft2232_expect_read,
                ft2232_buffer_size,
                LIBFTDI_READ_RETRY_COUNT - timeout);
            ft2232_debug_dump_buffer();

            exit(-1);
        }

#ifdef _DEBUG_USB_COMMS_
        LOG_DEBUG("read buffer (%i retries): %i bytes",
            LIBFTDI_READ_RETRY_COUNT - timeout,
            ft2232_buffer_size);
        ft2232_debug_dump_buffer();
#endif
    }

    ft2232_expect_read  = 0;
    ft2232_read_pointer = 0;

    /* return ERROR_OK, unless a jtag_read_buffer returns a failed check
     * that wasn't handled by a caller-provided error handler
     */
    retval = ERROR_OK;

    cmd = first;
    while (cmd != last) {
        switch (cmd->type) {
            case JTAG_SCAN:
                type = jtag_scan_type(cmd->cmd.scan);
                if (type != SCAN_OUT) {
                    scan_size = jtag_scan_size(cmd->cmd.scan);
                    buffer = calloc(DIV_ROUND_UP(scan_size, 8), 1);
                    ft2232_read_scan(type, buffer, scan_size);
                    if (jtag_read_buffer(buffer, cmd->cmd.scan) != ERROR_OK)
                        retval = ERROR_JTAG_QUEUE_FAILED;
                    free(buffer);
                }
                break;

            default:
                break;
        }

        cmd = cmd->next;
    }

    ft2232_buffer_size = 0;

    return retval;
}

static void ft2232_add_pathmove(tap_state_t *path, int num_states)
{
    int state_count = 0;

    assert((unsigned) num_states <= 32u);       /* tms_bits only holds 32 bits */

    DEBUG_JTAG_IO("-");

    /* this loop verifies that the path is legal and logs each state in the path */
    while (num_states) {
        unsigned char tms_byte = 0;     /* zero this on each MPSSE batch */
        int bit_count = 0;
        int num_states_batch = num_states > 7 ? 7 : num_states;

        /* command "Clock Data to TMS/CS Pin (no Read)" */
        buffer_write(0x4b);

        /* number of states remaining */
        buffer_write(num_states_batch - 1);

        while (num_states_batch--) {
            /* either TMS=0 or TMS=1 must work ... */
            if (tap_state_transition(tap_get_state(), false) == path[state_count])
                buf_set_u32(&tms_byte, bit_count++, 1, 0x0);
            else if (tap_state_transition(tap_get_state(), true) == path[state_count])
                buf_set_u32(&tms_byte, bit_count++, 1, 0x1);

            /* ... or else the caller goofed BADLY */
            else {
                LOG_ERROR("BUG: %s -> %s isn't a valid "
                    "TAP state transition",
                    tap_state_name(tap_get_state()),
                    tap_state_name(path[state_count]));
                exit(-1);
            }

            tap_set_state(path[state_count]);
            state_count++;
            num_states--;
        }

        buffer_write(tms_byte);
    }
    tap_set_end_state(tap_get_state());
}

static void ft2232_add_scan(bool ir_scan, enum scan_type type, uint8_t *buffer, int scan_size)
{
    int num_bytes = (scan_size + 7) / 8;
    int bits_left = scan_size;
    int cur_byte  = 0;
    int last_bit;

    if (!ir_scan) {
        if (tap_get_state() != TAP_DRSHIFT)
            move_to_state(TAP_DRSHIFT);
    } else {
        if (tap_get_state() != TAP_IRSHIFT)
            move_to_state(TAP_IRSHIFT);
    }

    /* add command for complete bytes */
    while (num_bytes > 1) {
        int thisrun_bytes;
        if (type == SCAN_IO) {
            /* Clock Data Bytes In and Out LSB First */
            buffer_write(0x39);
            /* LOG_DEBUG("added TDI bytes (io %i)", num_bytes); */
        } else if (type == SCAN_OUT) {
            /* Clock Data Bytes Out on -ve Clock Edge LSB First (no Read) */
            buffer_write(0x19);
            /* LOG_DEBUG("added TDI bytes (o)"); */
        } else if (type == SCAN_IN) {
            /* Clock Data Bytes In on +ve Clock Edge LSB First (no Write) */
            buffer_write(0x28);
            /* LOG_DEBUG("added TDI bytes (i %i)", num_bytes); */
        }

        thisrun_bytes = (num_bytes > 65537) ? 65536 : (num_bytes - 1);
        num_bytes -= thisrun_bytes;

        buffer_write((uint8_t) (thisrun_bytes - 1));
        buffer_write((uint8_t) ((thisrun_bytes - 1) >> 8));

        if (type != SCAN_IN) {
            /* add complete bytes */
            while (thisrun_bytes-- > 0) {
                buffer_write(buffer[cur_byte++]);
                bits_left -= 8;
            }
        } else /* (type == SCAN_IN) */
            bits_left -= 8 * (thisrun_bytes);
    }

    /* the most signifcant bit is scanned during TAP movement */
    if (type != SCAN_IN)
        last_bit = (buffer[cur_byte] >> (bits_left - 1)) & 0x1;
    else
        last_bit = 0;

    /* process remaining bits but the last one */
    if (bits_left > 1) {
        if (type == SCAN_IO) {
            /* Clock Data Bits In and Out LSB First */
            buffer_write(0x3b);
            /* LOG_DEBUG("added TDI bits (io) %i", bits_left - 1); */
        } else if (type == SCAN_OUT) {
            /* Clock Data Bits Out on -ve Clock Edge LSB First (no Read) */
            buffer_write(0x1b);
            /* LOG_DEBUG("added TDI bits (o)"); */
        } else if (type == SCAN_IN) {
            /* Clock Data Bits In on +ve Clock Edge LSB First (no Write) */
            buffer_write(0x2a);
            /* LOG_DEBUG("added TDI bits (i %i)", bits_left - 1); */
        }

        buffer_write(bits_left - 2);
        if (type != SCAN_IN)
            buffer_write(buffer[cur_byte]);
    }

    if ((ir_scan && (tap_get_end_state() == TAP_IRSHIFT))
            || (!ir_scan && (tap_get_end_state() == TAP_DRSHIFT))) {
        if (type == SCAN_IO) {
            /* Clock Data Bits In and Out LSB First */
            buffer_write(0x3b);
            /* LOG_DEBUG("added TDI bits (io) %i", bits_left - 1); */
        } else if (type == SCAN_OUT) {
            /* Clock Data Bits Out on -ve Clock Edge LSB First (no Read) */
            buffer_write(0x1b);
            /* LOG_DEBUG("added TDI bits (o)"); */
        } else if (type == SCAN_IN) {
            /* Clock Data Bits In on +ve Clock Edge LSB First (no Write) */
            buffer_write(0x2a);
            /* LOG_DEBUG("added TDI bits (i %i)", bits_left - 1); */
        }
        buffer_write(0x0);
        if (type != SCAN_IN)
            buffer_write(last_bit);
    } else {
        int tms_bits;
        int tms_count;
        uint8_t mpsse_cmd;

        /* move from Shift-IR/DR to end state */
        if (type != SCAN_OUT) {
            /* We always go to the PAUSE state in two step at the end of an IN or IO
             *scan
             * This must be coordinated with the bit shifts in ft2232_read_scan    */
            tms_bits  = 0x01;
            tms_count = 2;
            /* Clock Data to TMS/CS Pin with Read */
            mpsse_cmd = 0x6b;
        } else {
            tms_bits  = tap_get_tms_path(tap_get_state(), tap_get_end_state());
            tms_count = tap_get_tms_path_len(tap_get_state(), tap_get_end_state());
            /* Clock Data to TMS/CS Pin (no Read) */
            mpsse_cmd = 0x4b;
        }

        DEBUG_JTAG_IO("finish %s", (type == SCAN_OUT) ? "without read" : "via PAUSE");
        clock_tms(mpsse_cmd, tms_bits, tms_count, last_bit);
    }

    if (tap_get_state() != tap_get_end_state())
        move_to_state(tap_get_end_state());
}

static int ft2232_large_scan(struct scan_command *cmd,
    enum scan_type type,
    uint8_t *buffer,
    int scan_size)
{
    int num_bytes = (scan_size + 7) / 8;
    int bits_left = scan_size;
    int cur_byte  = 0;
    int last_bit;
    uint8_t *receive_buffer  = malloc(DIV_ROUND_UP(scan_size, 8));
    uint8_t *receive_pointer = receive_buffer;
    uint32_t bytes_written;
    uint32_t bytes_read;
    int retval;
    int thisrun_read = 0;

    if (!receive_buffer) {
        LOG_ERROR("failed to allocate memory");
        exit(-1);
    }

    if (cmd->ir_scan) {
        LOG_ERROR("BUG: large IR scans are not supported");
        exit(-1);
    }

    if (tap_get_state() != TAP_DRSHIFT)
        move_to_state(TAP_DRSHIFT);

    retval = ft2232_write(ft2232_buffer, ft2232_buffer_size, &bytes_written);
    if (retval != ERROR_OK) {
        LOG_ERROR("couldn't write MPSSE commands to FT2232");
        exit(-1);
    }
    LOG_DEBUG("ft2232_buffer_size: %i, bytes_written: %i",
        ft2232_buffer_size, (int)bytes_written);
    ft2232_buffer_size = 0;

    /* add command for complete bytes */
    while (num_bytes > 1) {
        int thisrun_bytes;

        if (type == SCAN_IO) {
            /* Clock Data Bytes In and Out LSB First */
            buffer_write(0x39);
            /* LOG_DEBUG("added TDI bytes (io %i)", num_bytes); */
        } else if (type == SCAN_OUT) {
            /* Clock Data Bytes Out on -ve Clock Edge LSB First (no Read) */
            buffer_write(0x19);
            /* LOG_DEBUG("added TDI bytes (o)"); */
        } else if (type == SCAN_IN) {
            /* Clock Data Bytes In on +ve Clock Edge LSB First (no Write) */
            buffer_write(0x28);
            /* LOG_DEBUG("added TDI bytes (i %i)", num_bytes); */
        }

        thisrun_bytes = (num_bytes > 65537) ? 65536 : (num_bytes - 1);
        thisrun_read  = thisrun_bytes;
        num_bytes    -= thisrun_bytes;
        buffer_write((uint8_t) (thisrun_bytes - 1));
        buffer_write((uint8_t) ((thisrun_bytes - 1) >> 8));

        if (type != SCAN_IN) {
            /* add complete bytes */
            while (thisrun_bytes-- > 0) {
                buffer_write(buffer[cur_byte]);
                cur_byte++;
                bits_left -= 8;
            }
        } else /* (type == SCAN_IN) */
            bits_left -= 8 * (thisrun_bytes);

        retval = ft2232_write(ft2232_buffer, ft2232_buffer_size, &bytes_written);
        if (retval != ERROR_OK) {
            LOG_ERROR("couldn't write MPSSE commands to FT2232");
            exit(-1);
        }
        LOG_DEBUG("ft2232_buffer_size: %i, bytes_written: %i",
            ft2232_buffer_size,
            (int)bytes_written);
        ft2232_buffer_size = 0;

        if (type != SCAN_OUT) {
            retval = ft2232_read(receive_pointer, thisrun_read, &bytes_read);
            if (retval != ERROR_OK) {
                LOG_ERROR("couldn't read from FT2232");
                exit(-1);
            }
            LOG_DEBUG("thisrun_read: %i, bytes_read: %i",
                thisrun_read,
                (int)bytes_read);
            receive_pointer += bytes_read;
        }
    }

    thisrun_read = 0;

    /* the most signifcant bit is scanned during TAP movement */
    if (type != SCAN_IN)
        last_bit = (buffer[cur_byte] >> (bits_left - 1)) & 0x1;
    else
        last_bit = 0;

    /* process remaining bits but the last one */
    if (bits_left > 1) {
        if (type == SCAN_IO) {
            /* Clock Data Bits In and Out LSB First */
            buffer_write(0x3b);
            /* LOG_DEBUG("added TDI bits (io) %i", bits_left - 1); */
        } else if (type == SCAN_OUT) {
            /* Clock Data Bits Out on -ve Clock Edge LSB First (no Read) */
            buffer_write(0x1b);
            /* LOG_DEBUG("added TDI bits (o)"); */
        } else if (type == SCAN_IN) {
            /* Clock Data Bits In on +ve Clock Edge LSB First (no Write) */
            buffer_write(0x2a);
            /* LOG_DEBUG("added TDI bits (i %i)", bits_left - 1); */
        }
        buffer_write(bits_left - 2);
        if (type != SCAN_IN)
            buffer_write(buffer[cur_byte]);

        if (type != SCAN_OUT)
            thisrun_read += 2;
    }

    if (tap_get_end_state() == TAP_DRSHIFT) {
        if (type == SCAN_IO) {
            /* Clock Data Bits In and Out LSB First */
            buffer_write(0x3b);
            /* LOG_DEBUG("added TDI bits (io) %i", bits_left - 1); */
        } else if (type == SCAN_OUT) {
            /* Clock Data Bits Out on -ve Clock Edge LSB First (no Read) */
            buffer_write(0x1b);
            /* LOG_DEBUG("added TDI bits (o)"); */
        } else if (type == SCAN_IN) {
            /* Clock Data Bits In on +ve Clock Edge LSB First (no Write) */
            buffer_write(0x2a);
            /* LOG_DEBUG("added TDI bits (i %i)", bits_left - 1); */
        }
        buffer_write(0x0);
        buffer_write(last_bit);
    } else {
        int tms_bits  = tap_get_tms_path(tap_get_state(), tap_get_end_state());
        int tms_count = tap_get_tms_path_len(tap_get_state(), tap_get_end_state());
        uint8_t mpsse_cmd;

        /* move from Shift-IR/DR to end state */
        if (type != SCAN_OUT) {
            /* Clock Data to TMS/CS Pin with Read */
            mpsse_cmd = 0x6b;
            /* LOG_DEBUG("added TMS scan (read)"); */
        } else {
            /* Clock Data to TMS/CS Pin (no Read) */
            mpsse_cmd = 0x4b;
            /* LOG_DEBUG("added TMS scan (no read)"); */
        }

        DEBUG_JTAG_IO("finish, %s", (type == SCAN_OUT) ? "no read" : "read");
        clock_tms(mpsse_cmd, tms_bits, tms_count, last_bit);
    }

    if (type != SCAN_OUT)
        thisrun_read += 1;

    retval = ft2232_write(ft2232_buffer, ft2232_buffer_size, &bytes_written);
    if (retval != ERROR_OK) {
        LOG_ERROR("couldn't write MPSSE commands to FT2232");
        exit(-1);
    }
    LOG_DEBUG("ft2232_buffer_size: %i, bytes_written: %i",
        ft2232_buffer_size,
        (int)bytes_written);
    ft2232_buffer_size = 0;

    if (type != SCAN_OUT) {
        retval = ft2232_read(receive_pointer, thisrun_read, &bytes_read);
        if (retval != ERROR_OK) {
            LOG_ERROR("couldn't read from FT2232");
            exit(-1);
        }
        LOG_DEBUG("thisrun_read: %i, bytes_read: %i",
            thisrun_read,
            (int)bytes_read);
    }

    free(receive_buffer);

    return ERROR_OK;
}

static int ft2232_predict_scan_out(int scan_size, enum scan_type type)
{
    int predicted_size = 3;
    int num_bytes = (scan_size - 1) / 8;

    if (tap_get_state() != TAP_DRSHIFT)
        predicted_size += get_tms_buffer_requirements(
                tap_get_tms_path_len(tap_get_state(), TAP_DRSHIFT));

    if (type == SCAN_IN) {  /* only from device to host */
        /* complete bytes */
        predicted_size += DIV_ROUND_UP(num_bytes, 65536) * 3;

        /* remaining bits - 1 (up to 7) */
        predicted_size += ((scan_size - 1) % 8) ? 2 : 0;
    } else {/* host to device, or bidirectional
         * complete bytes */
        predicted_size += num_bytes + DIV_ROUND_UP(num_bytes, 65536) * 3;

        /* remaining bits -1 (up to 7) */
        predicted_size += ((scan_size - 1) % 8) ? 3 : 0;
    }

    return predicted_size;
}

static int ft2232_predict_scan_in(int scan_size, enum scan_type type)
{
    int predicted_size = 0;

    if (type != SCAN_OUT) {
        /* complete bytes */
        predicted_size +=
            (DIV_ROUND_UP(scan_size, 8) > 1) ? (DIV_ROUND_UP(scan_size, 8) - 1) : 0;

        /* remaining bits - 1 */
        predicted_size += ((scan_size - 1) % 8) ? 1 : 0;

        /* last bit (from TMS scan) */
        predicted_size += 1;
    }

    /* LOG_DEBUG("scan_size: %i, predicted_size: %i", scan_size, predicted_size); */

    return predicted_size;
}

/* semi-generic FT2232/FT4232 reset code */
static void ftx23_reset(int trst, int srst)
{
    enum reset_types jtag_reset_config = jtag_get_reset_config();
    if (trst == 1) {
        if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
            low_direction |= nTRSTnOE;  /* switch to output pin (output is low) */
        else
            low_output &= ~nTRST;       /* switch output low */
    } else if (trst == 0) {
        if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
            low_direction &= ~nTRSTnOE; /* switch to input pin (high-Z + internal
                             *and external pullup) */
        else
            low_output |= nTRST;        /* switch output high */
    }

    if (srst == 1) {
        if (jtag_reset_config & RESET_SRST_PUSH_PULL)
            low_output &= ~nSRST;       /* switch output low */
        else
            low_direction |= nSRSTnOE;  /* switch to output pin (output is low) */
    } else if (srst == 0) {
        if (jtag_reset_config & RESET_SRST_PUSH_PULL)
            low_output |= nSRST;        /* switch output high */
        else
            low_direction &= ~nSRSTnOE; /* switch to input pin (high-Z) */
    }

    /* command "set data bits low byte" */
    buffer_write(0x80);
    buffer_write(low_output);
    buffer_write(low_direction);
}

static void jtagkey_reset(int trst, int srst)
{
    enum reset_types jtag_reset_config = jtag_get_reset_config();
    if (trst == 1) {
        if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
            high_output &= ~nTRSTnOE;
        else
            high_output &= ~nTRST;
    } else if (trst == 0) {
        if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
            high_output |= nTRSTnOE;
        else
            high_output |= nTRST;
    }

    if (srst == 1) {
        if (jtag_reset_config & RESET_SRST_PUSH_PULL)
            high_output &= ~nSRST;
        else
            high_output &= ~nSRSTnOE;
    } else if (srst == 0) {
        if (jtag_reset_config & RESET_SRST_PUSH_PULL)
            high_output |= nSRST;
        else
            high_output |= nSRSTnOE;
    }

    /* command "set data bits high byte" */
    buffer_write(0x82);
    buffer_write(high_output);
    buffer_write(high_direction);
    LOG_DEBUG("trst: %i, srst: %i, high_output: 0x%2.2x, high_direction: 0x%2.2x",
        trst,
        srst,
        high_output,
        high_direction);
}

static void olimex_jtag_reset(int trst, int srst)
{
    enum reset_types jtag_reset_config = jtag_get_reset_config();
    if (trst == 1) {
        if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
            high_output &= ~nTRSTnOE;
        else
            high_output &= ~nTRST;
    } else if (trst == 0) {
        if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
            high_output |= nTRSTnOE;
        else
            high_output |= nTRST;
    }

    if (srst == 1)
        high_output |= nSRST;
    else if (srst == 0)
        high_output &= ~nSRST;

    /* command "set data bits high byte" */
    buffer_write(0x82);
    buffer_write(high_output);
    buffer_write(high_direction);
    LOG_DEBUG("trst: %i, srst: %i, high_output: 0x%2.2x, high_direction: 0x%2.2x",
        trst,
        srst,
        high_output,
        high_direction);
}

static void axm0432_jtag_reset(int trst, int srst)
{
    if (trst == 1) {
        tap_set_state(TAP_RESET);
        high_output &= ~nTRST;
    } else if (trst == 0)
        high_output |= nTRST;

    if (srst == 1)
        high_output &= ~nSRST;
    else if (srst == 0)
        high_output |= nSRST;

    /* command "set data bits low byte" */
    buffer_write(0x82);
    buffer_write(high_output);
    buffer_write(high_direction);
    LOG_DEBUG("trst: %i, srst: %i, high_output: 0x%2.2x, high_direction: 0x%2.2x",
        trst,
        srst,
        high_output,
        high_direction);
}

static void flyswatter_reset(int trst, int srst)
{
    if (trst == 1)
        low_output &= ~nTRST;
    else if (trst == 0)
        low_output |= nTRST;

    if (srst == 1)
        low_output |= nSRST;
    else if (srst == 0)
        low_output &= ~nSRST;

    /* command "set data bits low byte" */
    buffer_write(0x80);
    buffer_write(low_output);
    buffer_write(low_direction);
    LOG_DEBUG("trst: %i, srst: %i, low_output: 0x%2.2x, low_direction: 0x%2.2x",
        trst,
        srst,
        low_output,
        low_direction);
}

static void flyswatter1_reset(int trst, int srst)
{
    flyswatter_reset(trst, srst);
}

static void flyswatter2_reset(int trst, int srst)
{
    flyswatter_reset(trst, !srst);
}

static void minimodule_reset(int trst, int srst)
{
    if (srst == 1)
        low_output &= ~nSRST;
    else if (srst == 0)
        low_output |= nSRST;

    /* command "set data bits low byte" */
    buffer_write(0x80);
    buffer_write(low_output);
    buffer_write(low_direction);
    LOG_DEBUG("trst: %i, srst: %i, low_output: 0x%2.2x, low_direction: 0x%2.2x",
        trst,
        srst,
        low_output,
        low_direction);
}

static void turtle_reset(int trst, int srst)
{
    if (trst == 1)
        LOG_ERROR("Can't assert TRST: the adapter lacks this signal");

    if (srst == 1)
        low_output |= nSRST;
    else if (srst == 0)
        low_output &= ~nSRST;

    /* command "set data bits low byte" */
    buffer_write(0x80);
    buffer_write(low_output);
    buffer_write(low_direction);
    LOG_DEBUG("srst: %i, low_output: 0x%2.2x, low_direction: 0x%2.2x",
        srst,
        low_output,
        low_direction);
}

static void comstick_reset(int trst, int srst)
{
    if (trst == 1)
        high_output &= ~nTRST;
    else if (trst == 0)
        high_output |= nTRST;

    if (srst == 1)
        high_output &= ~nSRST;
    else if (srst == 0)
        high_output |= nSRST;

    /* command "set data bits high byte" */
    buffer_write(0x82);
    buffer_write(high_output);
    buffer_write(high_direction);
    LOG_DEBUG("trst: %i, srst: %i, high_output: 0x%2.2x, high_direction: 0x%2.2x",
        trst,
        srst,
        high_output,
        high_direction);
}

static void stm32stick_reset(int trst, int srst)
{
    if (trst == 1)
        high_output &= ~nTRST;
    else if (trst == 0)
        high_output |= nTRST;

    if (srst == 1)
        low_output &= ~nSRST;
    else if (srst == 0)
        low_output |= nSRST;

    /* command "set data bits low byte" */
    buffer_write(0x80);
    buffer_write(low_output);
    buffer_write(low_direction);

    /* command "set data bits high byte" */
    buffer_write(0x82);
    buffer_write(high_output);
    buffer_write(high_direction);
    LOG_DEBUG("trst: %i, srst: %i, high_output: 0x%2.2x, high_direction: 0x%2.2x",
        trst,
        srst,
        high_output,
        high_direction);
}

static void sheevaplug_reset(int trst, int srst)
{
    if (trst == 1)
        high_output &= ~nTRST;
    else if (trst == 0)
        high_output |= nTRST;

    if (srst == 1)
        high_output &= ~nSRSTnOE;
    else if (srst == 0)
        high_output |= nSRSTnOE;

    /* command "set data bits high byte" */
    buffer_write(0x82);
    buffer_write(high_output);
    buffer_write(high_direction);
    LOG_DEBUG("trst: %i, srst: %i, high_output: 0x%2.2x, high_direction: 0x%2.2x",
        trst,
        srst,
        high_output,
        high_direction);
}

static void redbee_reset(int trst, int srst)
{
    if (trst == 1) {
        tap_set_state(TAP_RESET);
        high_output &= ~nTRST;
    } else if (trst == 0)
        high_output |= nTRST;

    if (srst == 1)
        high_output &= ~nSRST;
    else if (srst == 0)
        high_output |= nSRST;

    /* command "set data bits low byte" */
    buffer_write(0x82);
    buffer_write(high_output);
    buffer_write(high_direction);
    LOG_DEBUG("trst: %i, srst: %i, high_output: 0x%2.2x, "
        "high_direction: 0x%2.2x", trst, srst, high_output,
        high_direction);
}

static void xds100v2_reset(int trst, int srst)
{
    if (trst == 1) {
        tap_set_state(TAP_RESET);
        high_output &= ~nTRST;
    } else if (trst == 0)
        high_output |= nTRST;

    if (srst == 1)
        high_output |= nSRST;
    else if (srst == 0)
        high_output &= ~nSRST;

    /* command "set data bits low byte" */
    buffer_write(0x82);
    buffer_write(high_output);
    buffer_write(high_direction);
    LOG_DEBUG("trst: %i, srst: %i, high_output: 0x%2.2x, "
        "high_direction: 0x%2.2x", trst, srst, high_output,
        high_direction);
}

static int ft2232_execute_runtest(struct jtag_command *cmd)
{
    int retval;
    int i;
    int predicted_size = 0;
    retval = ERROR_OK;

    DEBUG_JTAG_IO("runtest %i cycles, end in %s",
        cmd->cmd.runtest->num_cycles,
        tap_state_name(cmd->cmd.runtest->end_state));

    /* only send the maximum buffer size that FT2232C can handle */
    predicted_size = 0;
    if (tap_get_state() != TAP_IDLE)
        predicted_size += 3;
    predicted_size += 3 * DIV_ROUND_UP(cmd->cmd.runtest->num_cycles, 7);
    if (cmd->cmd.runtest->end_state != TAP_IDLE)
        predicted_size += 3;
    if (tap_get_end_state() != TAP_IDLE)
        predicted_size += 3;
    if (ft2232_buffer_size + predicted_size + 1 > FT2232_BUFFER_SIZE) {
        if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
            retval = ERROR_JTAG_QUEUE_FAILED;
        require_send = 0;
        first_unsent = cmd;
    }
    if (tap_get_state() != TAP_IDLE) {
        move_to_state(TAP_IDLE);
        require_send = 1;
    }
    i = cmd->cmd.runtest->num_cycles;
    while (i > 0) {
        /* there are no state transitions in this code, so omit state tracking */

        /* command "Clock Data to TMS/CS Pin (no Read)" */
        buffer_write(0x4b);

        /* scan 7 bits */
        buffer_write((i > 7) ? 6 : (i - 1));

        /* TMS data bits */
        buffer_write(0x0);

        i -= (i > 7) ? 7 : i;
        /* LOG_DEBUG("added TMS scan (no read)"); */
    }

    ft2232_end_state(cmd->cmd.runtest->end_state);

    if (tap_get_state() != tap_get_end_state())
        move_to_state(tap_get_end_state());

    require_send = 1;
    DEBUG_JTAG_IO("runtest: %i, end in %s",
        cmd->cmd.runtest->num_cycles,
        tap_state_name(tap_get_end_state()));
    return retval;
}

static int ft2232_execute_statemove(struct jtag_command *cmd)
{
    int predicted_size = 0;
    int retval = ERROR_OK;

    DEBUG_JTAG_IO("statemove end in %s",
        tap_state_name(cmd->cmd.statemove->end_state));

    /* only send the maximum buffer size that FT2232C can handle */
    predicted_size = 3;
    if (ft2232_buffer_size + predicted_size + 1 > FT2232_BUFFER_SIZE) {
        if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
            retval = ERROR_JTAG_QUEUE_FAILED;
        require_send = 0;
        first_unsent = cmd;
    }
    ft2232_end_state(cmd->cmd.statemove->end_state);

    /* For TAP_RESET, ignore the current recorded state.  It's often
     * wrong at server startup, and this transation is critical whenever
     * it's requested.
     */
    if (tap_get_end_state() == TAP_RESET) {
        clock_tms(0x4b,  0xff, 5, 0);
        require_send = 1;

        /* shortest-path move to desired end state */
    } else if (tap_get_state() != tap_get_end_state()) {
        move_to_state(tap_get_end_state());
        require_send = 1;
    }

    return retval;
}

static int ft2232_execute_tms(struct jtag_command *cmd)
{
    int retval = ERROR_OK;
    unsigned num_bits = cmd->cmd.tms->num_bits;
    const uint8_t *bits = cmd->cmd.tms->bits;
    unsigned count;

    DEBUG_JTAG_IO("TMS: %d bits", num_bits);

    /* only send the maximum buffer size that FT2232C can handle */
    count = 3 * DIV_ROUND_UP(num_bits, 4);
    if (ft2232_buffer_size + 3*count + 1 > FT2232_BUFFER_SIZE) {
        if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
            retval = ERROR_JTAG_QUEUE_FAILED;

        require_send = 0;
        first_unsent = cmd;
    }

    /* Shift out in batches of at most 6 bits; there's a report of an
     * FT2232 bug in this area, where shifting exactly 7 bits can make
     * problems with TMS signaling for the last clock cycle:
     *
     *    http://developer.intra2net.com/mailarchive/html/
     *      libftdi/2009/msg00292.html
     *
     * Command 0x4b is: "Clock Data to TMS/CS Pin (no Read)"
     *
     * Note that pathmoves in JTAG are not often seven bits, so that
     * isn't a particularly likely situation outside of "special"
     * signaling such as switching between JTAG and SWD modes.
     */
    while (num_bits) {
        if (num_bits <= 6) {
            buffer_write(0x4b);
            buffer_write(num_bits - 1);
            buffer_write(*bits & 0x3f);
            break;
        }

        /* Yes, this is lazy ... we COULD shift out more data
         * bits per operation, but doing it in nybbles is easy
         */
        buffer_write(0x4b);
        buffer_write(3);
        buffer_write(*bits & 0xf);
        num_bits -= 4;

        count  = (num_bits > 4) ? 4 : num_bits;

        buffer_write(0x4b);
        buffer_write(count - 1);
        buffer_write((*bits >> 4) & 0xf);
        num_bits -= count;

        bits++;
    }

    require_send = 1;
    return retval;
}

static int ft2232_execute_pathmove(struct jtag_command *cmd)
{
    int predicted_size = 0;
    int retval = ERROR_OK;

    tap_state_t *path = cmd->cmd.pathmove->path;
    int num_states    = cmd->cmd.pathmove->num_states;

    DEBUG_JTAG_IO("pathmove: %i states, current: %s  end: %s", num_states,
        tap_state_name(tap_get_state()),
        tap_state_name(path[num_states-1]));

    /* only send the maximum buffer size that FT2232C can handle */
    predicted_size = 3 * DIV_ROUND_UP(num_states, 7);
    if (ft2232_buffer_size + predicted_size + 1 > FT2232_BUFFER_SIZE) {
        if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
            retval = ERROR_JTAG_QUEUE_FAILED;

        require_send = 0;
        first_unsent = cmd;
    }

    ft2232_add_pathmove(path, num_states);
    require_send = 1;

    return retval;
}

static int ft2232_execute_scan(struct jtag_command *cmd)
{
    uint8_t *buffer;
    int scan_size;              /* size of IR or DR scan */
    int predicted_size = 0;
    int retval = ERROR_OK;

    enum scan_type type = jtag_scan_type(cmd->cmd.scan);

    DEBUG_JTAG_IO("%s type:%d", cmd->cmd.scan->ir_scan ? "IRSCAN" : "DRSCAN", type);

    scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);

    predicted_size = ft2232_predict_scan_out(scan_size, type);
    if ((predicted_size + 1) > FT2232_BUFFER_SIZE) {
        LOG_DEBUG("oversized ft2232 scan (predicted_size > FT2232_BUFFER_SIZE)");
        /* unsent commands before this */
        if (first_unsent != cmd)
            if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
                retval = ERROR_JTAG_QUEUE_FAILED;

        /* current command */
        ft2232_end_state(cmd->cmd.scan->end_state);
        ft2232_large_scan(cmd->cmd.scan, type, buffer, scan_size);
        require_send = 0;
        first_unsent = cmd->next;
        if (buffer)
            free(buffer);
        return retval;
    } else if (ft2232_buffer_size + predicted_size + 1 > FT2232_BUFFER_SIZE) {
        LOG_DEBUG(
            "ft2232 buffer size reached, sending queued commands (first_unsent: %p, cmd: %p)",
            first_unsent,
            cmd);
        if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
            retval = ERROR_JTAG_QUEUE_FAILED;
        require_send = 0;
        first_unsent = cmd;
    }
    ft2232_expect_read += ft2232_predict_scan_in(scan_size, type);
    /* LOG_DEBUG("new read size: %i", ft2232_expect_read); */
    ft2232_end_state(cmd->cmd.scan->end_state);
    ft2232_add_scan(cmd->cmd.scan->ir_scan, type, buffer, scan_size);
    require_send = 1;
    if (buffer)
        free(buffer);
    DEBUG_JTAG_IO("%s scan, %i bits, end in %s",
        (cmd->cmd.scan->ir_scan) ? "IR" : "DR", scan_size,
        tap_state_name(tap_get_end_state()));
    return retval;

}

static int ft2232_execute_reset(struct jtag_command *cmd)
{
    int retval;
    int predicted_size = 0;
    retval = ERROR_OK;

    DEBUG_JTAG_IO("reset trst: %i srst %i",
        cmd->cmd.reset->trst, cmd->cmd.reset->srst);

    /* only send the maximum buffer size that FT2232C can handle */
    predicted_size = 3;
    if (ft2232_buffer_size + predicted_size + 1 > FT2232_BUFFER_SIZE) {
        if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
            retval = ERROR_JTAG_QUEUE_FAILED;
        require_send = 0;
        first_unsent = cmd;
    }

    if ((cmd->cmd.reset->trst == 1) ||
        (cmd->cmd.reset->srst && (jtag_get_reset_config() & RESET_SRST_PULLS_TRST)))
        tap_set_state(TAP_RESET);

    layout->reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
    require_send = 1;

    DEBUG_JTAG_IO("trst: %i, srst: %i",
        cmd->cmd.reset->trst, cmd->cmd.reset->srst);
    return retval;
}

static int ft2232_execute_sleep(struct jtag_command *cmd)
{
    int retval;
    retval = ERROR_OK;

    DEBUG_JTAG_IO("sleep %" PRIi32, cmd->cmd.sleep->us);

    if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
        retval = ERROR_JTAG_QUEUE_FAILED;
    first_unsent = cmd->next;
    jtag_sleep(cmd->cmd.sleep->us);
    DEBUG_JTAG_IO("sleep %" PRIi32 " usec while in %s",
        cmd->cmd.sleep->us,
        tap_state_name(tap_get_state()));
    return retval;
}

static int ft2232_execute_stableclocks(struct jtag_command *cmd)
{
    int retval;
    retval = ERROR_OK;

    /* this is only allowed while in a stable state.  A check for a stable
     * state was done in jtag_add_clocks()
     */
    if (ft2232_stableclocks(cmd->cmd.stableclocks->num_cycles, cmd) != ERROR_OK)
        retval = ERROR_JTAG_QUEUE_FAILED;
    DEBUG_JTAG_IO("clocks %i while in %s",
        cmd->cmd.stableclocks->num_cycles,
        tap_state_name(tap_get_state()));
    return retval;
}

static int ft2232_execute_command(struct jtag_command *cmd)
{
    int retval;

    switch (cmd->type) {
        case JTAG_RESET:
            retval = ft2232_execute_reset(cmd);
            break;
        case JTAG_RUNTEST:
            retval = ft2232_execute_runtest(cmd);
            break;
        case JTAG_TLR_RESET:
            retval = ft2232_execute_statemove(cmd);
            break;
        case JTAG_PATHMOVE:
            retval = ft2232_execute_pathmove(cmd);
            break;
        case JTAG_SCAN:
            retval = ft2232_execute_scan(cmd);
            break;
        case JTAG_SLEEP:
            retval = ft2232_execute_sleep(cmd);
            break;
        case JTAG_STABLECLOCKS:
            retval = ft2232_execute_stableclocks(cmd);
            break;
        case JTAG_TMS:
            retval = ft2232_execute_tms(cmd);
            break;
        default:
            LOG_ERROR("BUG: unknown JTAG command type encountered");
            retval = ERROR_JTAG_QUEUE_FAILED;
            break;
    }
    return retval;
}

static int ft2232_execute_queue(void)
{
    struct jtag_command *cmd = jtag_command_queue;  /* currently processed command */
    int retval;

    first_unsent = cmd;     /* next command that has to be sent */
    require_send = 0;

    /* return ERROR_OK, unless ft2232_send_and_recv reports a failed check
     * that wasn't handled by a caller-provided error handler
     */
    retval = ERROR_OK;

    ft2232_buffer_size = 0;
    ft2232_expect_read = 0;

    /* blink, if the current layout has that feature */
    if (layout->blink)
        layout->blink();

    while (cmd) {
        /* fill the write buffer with the desired command */
        if (ft2232_execute_command(cmd) != ERROR_OK)
            retval = ERROR_JTAG_QUEUE_FAILED;
        /* Start reading input before FT2232 TX buffer fills up.
         * Sometimes this happens because we don't know the
         * length of the last command before we execute it. So
         * we simple inform the user.
         */
        cmd = cmd->next;

        if (ft2232_expect_read >= FT2232_BUFFER_READ_QUEUE_SIZE) {
            if (ft2232_expect_read > (FT2232_BUFFER_READ_QUEUE_SIZE+1))
                LOG_DEBUG("read buffer size looks too high %d/%d",
                    ft2232_expect_read,
                    (FT2232_BUFFER_READ_QUEUE_SIZE+1));
            if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
                retval = ERROR_JTAG_QUEUE_FAILED;
            first_unsent = cmd;
        }
    }

    if (require_send > 0)
        if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
            retval = ERROR_JTAG_QUEUE_FAILED;

    return retval;
}

#if BUILD_FT2232_FTD2XX == 1
static int ft2232_init_ftd2xx(uint16_t vid, uint16_t pid, int more, int *try_more)
{
    FT_STATUS status;
    DWORD deviceID;
    char SerialNumber[16];
    char Description[64];
    DWORD openex_flags  = 0;
    char *openex_string = NULL;
    uint8_t latency_timer;

    if (layout == NULL) {
        LOG_WARNING("No ft2232 layout specified'");
        return ERROR_JTAG_INIT_FAILED;
    }

    LOG_DEBUG("'ft2232' interface using FTD2XX with '%s' layout (%4.4x:%4.4x)",
            layout->name, vid, pid);

#if IS_WIN32 == 0
    /* Add non-standard Vid/Pid to the linux driver */
    status = FT_SetVIDPID(vid, pid);
    if (status != FT_OK)
        LOG_WARNING("couldn't add %4.4x:%4.4x", vid, pid);

#endif

    if (ft2232_device_desc && ft2232_serial) {
        LOG_WARNING(
            "can't open by device description and serial number, giving precedence to serial");
        ft2232_device_desc = NULL;
    }

    if (ft2232_device_desc) {
        openex_string = ft2232_device_desc;
        openex_flags  = FT_OPEN_BY_DESCRIPTION;
    } else if (ft2232_serial) {
        openex_string = ft2232_serial;
        openex_flags  = FT_OPEN_BY_SERIAL_NUMBER;
    } else {
        LOG_ERROR("neither device description nor serial number specified");
        LOG_ERROR(
            "please add \"ft2232_device_desc <string>\" or \"ft2232_serial <string>\" to your .cfg file");

        return ERROR_JTAG_INIT_FAILED;
    }

    status = FT_OpenEx(openex_string, openex_flags, &ftdih);
    if (status != FT_OK) {
        /* under Win32, the FTD2XX driver appends an "A" to the end
         * of the description, if we tried by the desc, then
         * try by the alternate "A" description. */
        if (openex_string == ft2232_device_desc) {
            /* Try the alternate method. */
            openex_string = ft2232_device_desc_A;
            status = FT_OpenEx(openex_string, openex_flags, &ftdih);
            if (status == FT_OK) {
                /* yea, the "alternate" method worked! */
            } else {
                /* drat, give the user a meaningfull message.
                 * telling the use we tried *BOTH* methods. */
                LOG_WARNING("Unable to open FTDI Device tried: '%s' and '%s'",
                    ft2232_device_desc,
                    ft2232_device_desc_A);
            }
        }
    }

    if (status != FT_OK) {
        DWORD num_devices;

        if (more) {
            LOG_WARNING("unable to open ftdi device (trying more): %s",
                ftd2xx_status_string(status));
            *try_more = 1;
            return ERROR_JTAG_INIT_FAILED;
        }
        LOG_ERROR("unable to open ftdi device: %s",
            ftd2xx_status_string(status));
        status = FT_ListDevices(&num_devices, NULL, FT_LIST_NUMBER_ONLY);
        if (status == FT_OK) {
            char **desc_array = malloc(sizeof(char *) * (num_devices + 1));
            uint32_t i;

            for (i = 0; i < num_devices; i++)
                desc_array[i] = malloc(64);

            desc_array[num_devices] = NULL;

            status = FT_ListDevices(desc_array, &num_devices, FT_LIST_ALL | openex_flags);

            if (status == FT_OK) {
                LOG_ERROR("ListDevices: %" PRIu32, (uint32_t)num_devices);
                for (i = 0; i < num_devices; i++)
                    LOG_ERROR("%" PRIu32 ": \"%s\"", i, desc_array[i]);
            }

            for (i = 0; i < num_devices; i++)
                free(desc_array[i]);

            free(desc_array);
        } else
            LOG_ERROR("ListDevices: NONE");
        return ERROR_JTAG_INIT_FAILED;
    }

    status = FT_SetLatencyTimer(ftdih, ft2232_latency);
    if (status != FT_OK) {
        LOG_ERROR("unable to set latency timer: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_INIT_FAILED;
    }

    status = FT_GetLatencyTimer(ftdih, &latency_timer);
    if (status != FT_OK) {
        /* ftd2xx 1.04 (linux) has a bug when calling FT_GetLatencyTimer
         * so ignore errors if using this driver version */
        DWORD dw_version;

        status = FT_GetDriverVersion(ftdih, &dw_version);
        LOG_ERROR("unable to get latency timer: %s",
            ftd2xx_status_string(status));

        if ((status == FT_OK) && (dw_version == 0x10004)) {
            LOG_ERROR("ftd2xx 1.04 detected - this has known issues " \
                "with FT_GetLatencyTimer, upgrade to a newer version");
        } else
            return ERROR_JTAG_INIT_FAILED;
    } else
        LOG_DEBUG("current latency timer: %i", latency_timer);

    status = FT_SetTimeouts(ftdih, 5000, 5000);
    if (status != FT_OK) {
        LOG_ERROR("unable to set timeouts: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_INIT_FAILED;
    }

    status = FT_SetBitMode(ftdih, 0x0b, 2);
    if (status != FT_OK) {
        LOG_ERROR("unable to enable bit i/o mode: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_INIT_FAILED;
    }

    status = FT_GetDeviceInfo(ftdih, &ftdi_device, &deviceID,
            SerialNumber, Description, NULL);
    if (status != FT_OK) {
        LOG_ERROR("unable to get FT_GetDeviceInfo: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_INIT_FAILED;
    } else {
        static const char *type_str[] = {
            "BM", "AM", "100AX", "UNKNOWN", "2232C", "232R", "2232H", "4232H", "232H"
        };
        unsigned no_of_known_types = ARRAY_SIZE(type_str) - 1;
        unsigned type_index = ((unsigned)ftdi_device <= no_of_known_types)
            ? ftdi_device : FT_DEVICE_UNKNOWN;
        LOG_INFO("device: %" PRIu32 " \"%s\"", (uint32_t)ftdi_device, type_str[type_index]);
        LOG_INFO("deviceID: %" PRIu32, (uint32_t)deviceID);
        LOG_INFO("SerialNumber: %s", SerialNumber);
        LOG_INFO("Description: %s", Description);
    }

    return ERROR_OK;
}

static int ft2232_purge_ftd2xx(void)
{
    FT_STATUS status;

    status = FT_Purge(ftdih, FT_PURGE_RX | FT_PURGE_TX);
    if (status != FT_OK) {
        LOG_ERROR("error purging ftd2xx device: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

#endif  /* BUILD_FT2232_FTD2XX == 1 */

#if BUILD_FT2232_LIBFTDI == 1
static int ft2232_init_libftdi(uint16_t vid, uint16_t pid, int more, int *try_more, int channel)
{
    uint8_t latency_timer;

    if (layout == NULL) {
        LOG_WARNING("No ft2232 layout specified'");
        return ERROR_JTAG_INIT_FAILED;
    }

    LOG_DEBUG("'ft2232' interface using libftdi with '%s' layout (%4.4x:%4.4x)",
        layout->name, vid, pid);

    if (ftdi_init(&ftdic) < 0)
        return ERROR_JTAG_INIT_FAILED;

    /* default to INTERFACE_A */
    if (channel == INTERFACE_ANY)
        channel = INTERFACE_A;
    if (ftdi_set_interface(&ftdic, channel) < 0) {
        LOG_ERROR("unable to select FT2232 channel A: %s", ftdic.error_str);
        return ERROR_JTAG_INIT_FAILED;
    }

    /* context, vendor id, product id */
    if (ftdi_usb_open_desc(&ftdic, vid, pid, ft2232_device_desc, ft2232_serial) < 0) {
        if (more)
            LOG_WARNING("unable to open ftdi device (trying more): %s",
                ftdic.error_str);
        else
            LOG_ERROR("unable to open ftdi device: %s", ftdic.error_str);
        *try_more = 1;
        return ERROR_JTAG_INIT_FAILED;
    }

    /* There is already a reset in ftdi_usb_open_desc, this should be redundant */
    if (ftdi_usb_reset(&ftdic) < 0) {
        LOG_ERROR("unable to reset ftdi device");
        return ERROR_JTAG_INIT_FAILED;
    }

    if (ftdi_set_latency_timer(&ftdic, ft2232_latency) < 0) {
        LOG_ERROR("unable to set latency timer");
        return ERROR_JTAG_INIT_FAILED;
    }

    if (ftdi_get_latency_timer(&ftdic, &latency_timer) < 0) {
        LOG_ERROR("unable to get latency timer");
        return ERROR_JTAG_INIT_FAILED;
    } else
        LOG_DEBUG("current latency timer: %i", latency_timer);

    ftdi_set_bitmode(&ftdic, 0x0b, 2);  /* ctx, JTAG I/O mask */

    ftdi_device = ftdic.type;
    static const char *type_str[] = {
        "AM", "BM", "2232C", "R", "2232H", "4232H", "232H", "Unknown"
    };
    unsigned no_of_known_types = ARRAY_SIZE(type_str) - 1;
    unsigned type_index = ((unsigned)ftdi_device < no_of_known_types)
        ? ftdi_device : no_of_known_types;
    LOG_DEBUG("FTDI chip type: %i \"%s\"", (int)ftdi_device, type_str[type_index]);
    return ERROR_OK;
}

static int ft2232_purge_libftdi(void)
{
    if (ftdi_usb_purge_buffers(&ftdic) < 0) {
        LOG_ERROR("ftdi_purge_buffers: %s", ftdic.error_str);
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

#endif  /* BUILD_FT2232_LIBFTDI == 1 */

static int ft2232_set_data_bits_low_byte(uint8_t value, uint8_t direction)
{
    uint8_t buf[3];
    uint32_t bytes_written;

    buf[0] = 0x80;      /* command "set data bits low byte" */
    buf[1] = value;     /* value */
    buf[2] = direction; /* direction */

    LOG_DEBUG("%2.2x %2.2x %2.2x", buf[0], buf[1], buf[2]);

    if (ft2232_write(buf, sizeof(buf), &bytes_written) != ERROR_OK) {
        LOG_ERROR("couldn't initialize data bits low byte");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static int ft2232_set_data_bits_high_byte(uint8_t value, uint8_t direction)
{
    uint8_t buf[3];
    uint32_t bytes_written;

    buf[0] = 0x82;      /* command "set data bits high byte" */
    buf[1] = value;     /* value */
    buf[2] = direction; /* direction */

    LOG_DEBUG("%2.2x %2.2x %2.2x", buf[0], buf[1], buf[2]);

    if (ft2232_write(buf, sizeof(buf), &bytes_written) != ERROR_OK) {
        LOG_ERROR("couldn't initialize data bits high byte");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static int ft2232_init(void)
{
    uint8_t buf[1];
    int retval;
    uint32_t bytes_written;

    LOG_WARNING("Using DEPRECATED interface driver 'ft2232'");
#if BUILD_FTDI
    LOG_INFO("Consider using the 'ftdi' interface driver, with configuration files in interface/ftdi/...");
#endif

    if (tap_get_tms_path_len(TAP_IRPAUSE, TAP_IRPAUSE) == 7)
        LOG_DEBUG("ft2232 interface using 7 step jtag state transitions");
    else
        LOG_DEBUG("ft2232 interface using shortest path jtag state transitions");
    if (layout == NULL) {
        LOG_WARNING("No ft2232 layout specified'");
        return ERROR_JTAG_INIT_FAILED;
    }

    for (int i = 0; 1; i++) {
        /*
         * "more indicates that there are more IDs to try, so we should
         * not print an error for an ID mismatch (but for anything
         * else, we should).
         *
         * try_more indicates that the error code returned indicates an
         * ID mismatch (and nothing else) and that we should proceeed
         * with the next ID pair.
         */
        int more = ft2232_vid[i + 1] || ft2232_pid[i + 1];
        int try_more = 0;

#if BUILD_FT2232_FTD2XX == 1
        retval = ft2232_init_ftd2xx(ft2232_vid[i], ft2232_pid[i],
                more, &try_more);
#elif BUILD_FT2232_LIBFTDI == 1
        retval = ft2232_init_libftdi(ft2232_vid[i], ft2232_pid[i],
                more, &try_more, ft2232_channel);
#endif
        if (retval >= 0)
            break;
        if (!more || !try_more)
            return retval;
    }

    ft2232_buffer_size = 0;
    ft2232_buffer = malloc(FT2232_BUFFER_SIZE);

    if (layout->init() != ERROR_OK)
        return ERROR_JTAG_INIT_FAILED;

    if (ft2232_device_is_highspeed()) {
#ifndef BUILD_FT2232_HIGHSPEED
 #if BUILD_FT2232_FTD2XX == 1
        LOG_WARNING(
            "High Speed device found - You need a newer FTD2XX driver (version 2.04.16 or later)");
 #elif BUILD_FT2232_LIBFTDI == 1
        LOG_WARNING(
            "High Speed device found - You need a newer libftdi version (0.16 or later)");
 #endif
#endif
        /* make sure the legacy mode is disabled */
        if (ftx232h_clk_divide_by_5(false) != ERROR_OK)
            return ERROR_JTAG_INIT_FAILED;
    }

    buf[0] = 0x85;  /* Disconnect TDI/DO to TDO/DI for Loopback */
    retval = ft2232_write(buf, 1, &bytes_written);
    if (retval != ERROR_OK) {
        LOG_ERROR("couldn't write to FT2232 to disable loopback");
        return ERROR_JTAG_INIT_FAILED;
    }

#if BUILD_FT2232_FTD2XX == 1
    return ft2232_purge_ftd2xx();
#elif BUILD_FT2232_LIBFTDI == 1
    return ft2232_purge_libftdi();
#endif

    return ERROR_OK;
}

static inline void ftx232_dbus_init(void)
{
    low_output    = 0x08;
    low_direction = 0x0b;
}

static int ftx232_dbus_write(void)
{
    enum reset_types jtag_reset_config = jtag_get_reset_config();
    if (jtag_reset_config & RESET_TRST_OPEN_DRAIN) {
        low_direction &= ~nTRSTnOE; /* nTRST input */
        low_output &= ~nTRST;   /* nTRST = 0 */
    } else {
        low_direction |= nTRSTnOE;  /* nTRST output */
        low_output |= nTRST;        /* nTRST = 1 */
    }

    if (jtag_reset_config & RESET_SRST_PUSH_PULL) {
        low_direction |= nSRSTnOE;  /* nSRST output */
        low_output |= nSRST;        /* nSRST = 1 */
    } else {
        low_direction &= ~nSRSTnOE; /* nSRST input */
        low_output &= ~nSRST;   /* nSRST = 0 */
    }

    /* initialize low byte for jtag */
    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 DBUS");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static int usbjtag_init(void)
{
    /*
     * NOTE:  This is now _specific_ to the "usbjtag" layout.
     * Don't try cram any more layouts into this.
     */
    ftx232_dbus_init();

    nTRST    = 0x10;
    nTRSTnOE = 0x10;
    nSRST    = 0x40;
    nSRSTnOE = 0x40;

    return ftx232_dbus_write();
}

static int lm3s811_jtag_init(void)
{
    ftx232_dbus_init();

    /* There are multiple revisions of LM3S811 eval boards:
     * - Rev B (and older?) boards have no SWO trace support.
     * - Rev C boards add ADBUS_6 DBG_ENn and BDBUS_4 SWO_EN;
     *   they should use the "luminary_icdi" layout instead.
     */
    nTRST = 0x0;
    nTRSTnOE = 0x00;
    nSRST = 0x20;
    nSRSTnOE = 0x20;
    low_output    = 0x88;
    low_direction = 0x8b;

    return ftx232_dbus_write();
}

static int icdi_jtag_init(void)
{
    ftx232_dbus_init();

    /* Most Luminary eval boards support SWO trace output,
     * and should use this "luminary_icdi" layout.
     *
     * ADBUS 0..3 are used for JTAG as usual.  GPIOs are used
     * to switch between JTAG and SWD, or switch the ft2232 UART
     * on the second MPSSE channel/interface (BDBUS)
     * between (i) the stellaris UART (on Luminary boards)
     * or (ii) SWO trace data (generic).
     *
     * We come up in JTAG mode and may switch to SWD later (with
     * SWO/trace option if SWD is active).
     *
     * DBUS == GPIO-Lx
     * CBUS == GPIO-Hx
     */


#define ICDI_JTAG_EN (1 << 7)       /* ADBUS 7 (a.k.a. DBGMOD) */
#define ICDI_DBG_ENn (1 << 6)       /* ADBUS 6 */
#define ICDI_SRST (1 << 5)      /* ADBUS 5 */


    /* GPIOs on second channel/interface (UART) ... */
#define ICDI_SWO_EN (1 << 4)        /* BDBUS 4 */
#define ICDI_TX_SWO (1 << 1)        /* BDBUS 1 */
#define ICDI_VCP_RX (1 << 0)        /* BDBUS 0 (to stellaris UART) */

    nTRST = 0x0;
    nTRSTnOE = 0x00;
    nSRST = ICDI_SRST;
    nSRSTnOE = ICDI_SRST;

    low_direction |= ICDI_JTAG_EN | ICDI_DBG_ENn;
    low_output    |= ICDI_JTAG_EN;
    low_output    &= ~ICDI_DBG_ENn;

    return ftx232_dbus_write();
}

static int signalyzer_init(void)
{
    ftx232_dbus_init();

    nTRST    = 0x10;
    nTRSTnOE = 0x10;
    nSRST    = 0x20;
    nSRSTnOE = 0x20;
    return ftx232_dbus_write();
}

static int axm0432_jtag_init(void)
{
    low_output    = 0x08;
    low_direction = 0x2b;

    /* initialize low byte for jtag */
    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'JTAGkey' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    if (strcmp(layout->name, "axm0432_jtag") == 0) {
        nTRST    = 0x08;
        nTRSTnOE = 0x0;     /* No output enable for TRST*/
        nSRST    = 0x04;
        nSRSTnOE = 0x0;     /* No output enable for SRST*/
    } else {
        LOG_ERROR("BUG: axm0432_jtag_init called for non axm0432 layout");
        exit(-1);
    }

    high_output    = 0x0;
    high_direction = 0x0c;

    enum reset_types jtag_reset_config = jtag_get_reset_config();
    if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
        LOG_ERROR("can't set nTRSTOE to push-pull on the Dicarlo jtag");
    else
        high_output |= nTRST;

    if (jtag_reset_config & RESET_SRST_PUSH_PULL)
        LOG_ERROR("can't set nSRST to push-pull on the Dicarlo jtag");
    else
        high_output |= nSRST;

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'Dicarlo' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static int redbee_init(void)
{
    low_output    = 0x08;
    low_direction = 0x2b;

    /* initialize low byte for jtag */
    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'redbee' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    nTRST    = 0x08;
    nTRSTnOE = 0x0;     /* No output enable for TRST*/
    nSRST    = 0x04;
    nSRSTnOE = 0x0;     /* No output enable for SRST*/

    high_output    = 0x0;
    high_direction = 0x0c;

    enum reset_types jtag_reset_config = jtag_get_reset_config();
    if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
        LOG_ERROR("can't set nTRSTOE to push-pull on redbee");
    else
        high_output |= nTRST;

    if (jtag_reset_config & RESET_SRST_PUSH_PULL)
        LOG_ERROR("can't set nSRST to push-pull on redbee");
    else
        high_output |= nSRST;

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'redbee' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static int jtagkey_init(void)
{
    low_output    = 0x08;
    low_direction = 0x1b;

    /* initialize low byte for jtag */
    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'JTAGkey' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    if (strcmp(layout->name, "jtagkey") == 0) {
        nTRST    = 0x01;
        nTRSTnOE = 0x4;
        nSRST    = 0x02;
        nSRSTnOE = 0x08;
    } else if ((strcmp(layout->name, "jtagkey_prototype_v1") == 0)
           || (strcmp(layout->name, "oocdlink") == 0)) {
        nTRST    = 0x02;
        nTRSTnOE = 0x1;
        nSRST    = 0x08;
        nSRSTnOE = 0x04;
    } else {
        LOG_ERROR("BUG: jtagkey_init called for non jtagkey layout");
        exit(-1);
    }

    high_output    = 0x0;
    high_direction = 0x0f;

    enum reset_types jtag_reset_config = jtag_get_reset_config();
    if (jtag_reset_config & RESET_TRST_OPEN_DRAIN) {
        high_output |= nTRSTnOE;
        high_output &= ~nTRST;
    } else {
        high_output &= ~nTRSTnOE;
        high_output |= nTRST;
    }

    if (jtag_reset_config & RESET_SRST_PUSH_PULL) {
        high_output &= ~nSRSTnOE;
        high_output |= nSRST;
    } else {
        high_output |= nSRSTnOE;
        high_output &= ~nSRST;
    }

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'JTAGkey' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static int olimex_jtag_init(void)
{
    low_output    = 0x08;
    low_direction = 0x1b;

    /* initialize low byte for jtag */
    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'Olimex' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    nTRST    = 0x01;
    nTRSTnOE = 0x4;
    nSRST    = 0x02;
    nSRSTnOE = 0x00;/* no output enable for nSRST */

    high_output    = 0x0;
    high_direction = 0x0f;

    enum reset_types jtag_reset_config = jtag_get_reset_config();
    if (jtag_reset_config & RESET_TRST_OPEN_DRAIN) {
        high_output |= nTRSTnOE;
        high_output &= ~nTRST;
    } else {
        high_output &= ~nTRSTnOE;
        high_output |= nTRST;
    }

    if (jtag_reset_config & RESET_SRST_PUSH_PULL)
        LOG_ERROR("can't set nSRST to push-pull on the Olimex ARM-USB-OCD");
    else
        high_output &= ~nSRST;

    /* turn red LED on */
    high_output |= 0x08;

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'Olimex' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static int flyswatter_init(int rev)
{
    low_output    = 0x18;
    low_direction = 0x7b;

    if ((rev < 0) || (rev > 3)) {
        LOG_ERROR("bogus 'flyswatter' revision supplied (%i)", rev);
        return ERROR_JTAG_INIT_FAILED;
    }

    if (rev == 1)
        low_direction |= 1 << 7;

    /* initialize low byte for jtag */
    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'flyswatter' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    nTRST    = 0x10;
    nTRSTnOE = 0x0;     /* not output enable for nTRST */
    nSRST    = 0x20;
    nSRSTnOE = 0x00;    /* no output enable for nSRST */

    high_output    = 0x00;

    if (rev == 1)
        high_direction = 0x0c;
    else
        high_direction = 0x01;

    /* turn red LED3 on, LED2 off */
    high_output |= 0x08;

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'flyswatter' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static int flyswatter1_init(void)
{
    return flyswatter_init(1);
}

static int flyswatter2_init(void)
{
    return flyswatter_init(2);
}

static int minimodule_init(void)
{
    low_output    = 0x18;   /* check if srst should be 1 or 0 initially. (0x08) (flyswatter was
                 * 0x18) */
    low_direction = 0xfb;   /* 0xfb; */

    /* initialize low byte for jtag */
    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'minimodule' layout");
        return ERROR_JTAG_INIT_FAILED;
    }


    nSRST    = 0x20;

    high_output    = 0x00;
    high_direction = 0x05;

    /* turn red LED3 on, LED2 off */
    /* high_output |= 0x08; */

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'minimodule' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static int turtle_init(void)
{
    low_output    = 0x08;
    low_direction = 0x5b;

    /* initialize low byte for jtag */
    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'turtelizer2' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    nSRST = 0x40;

    high_output    = 0x00;
    high_direction = 0x0C;

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'turtelizer2' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static int comstick_init(void)
{
    low_output    = 0x08;
    low_direction = 0x0b;

    /* initialize low byte for jtag */
    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'comstick' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    nTRST    = 0x01;
    nTRSTnOE = 0x00;    /* no output enable for nTRST */
    nSRST    = 0x02;
    nSRSTnOE = 0x00;    /* no output enable for nSRST */

    high_output    = 0x03;
    high_direction = 0x03;

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'comstick' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static int stm32stick_init(void)
{
    low_output    = 0x88;
    low_direction = 0x8b;

    /* initialize low byte for jtag */
    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'stm32stick' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    nTRST    = 0x01;
    nTRSTnOE = 0x00;    /* no output enable for nTRST */
    nSRST    = 0x80;
    nSRSTnOE = 0x00;    /* no output enable for nSRST */

    high_output    = 0x01;
    high_direction = 0x03;

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'stm32stick' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static int sheevaplug_init(void)
{
    low_output = 0x08;
    low_direction = 0x1b;

    /* initialize low byte for jtag */
    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'sheevaplug' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    nTRSTnOE = 0x1;
    nTRST = 0x02;
    nSRSTnOE = 0x4;
    nSRST = 0x08;

    high_output = 0x0;
    high_direction = 0x0f;

    /* nTRST is always push-pull */
    high_output &= ~nTRSTnOE;
    high_output |= nTRST;

    /* nSRST is always open-drain */
    high_output |= nSRSTnOE;
    high_output &= ~nSRST;

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'sheevaplug' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static int cortino_jtag_init(void)
{
    low_output    = 0x08;
    low_direction = 0x1b;

    /* initialize low byte for jtag */
    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'cortino' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    nTRST    = 0x01;
    nTRSTnOE = 0x00;    /* no output enable for nTRST */
    nSRST    = 0x02;
    nSRSTnOE = 0x00;    /* no output enable for nSRST */

    high_output    = 0x03;
    high_direction = 0x03;

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'cortino' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static int lisa_l_init(void)
{
    ftx232_dbus_init();

    nTRST    = 0x10;
    nTRSTnOE = 0x10;
    nSRST    = 0x40;
    nSRSTnOE = 0x40;

    high_output = 0x00;
    high_direction = 0x18;

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'lisa_l' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ftx232_dbus_write();
}

static int flossjtag_init(void)
{
    ftx232_dbus_init();

    nTRST    = 0x10;
    nTRSTnOE = 0x10;
    nSRST    = 0x40;
    nSRSTnOE = 0x40;

    high_output = 0x00;
    high_direction = 0x18;

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'Floss-JTAG' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ftx232_dbus_write();
}

/*
 * The reference schematic from TI for the XDS100v2 has a CPLD on which opens
 * the door for a number of different configurations
 *
 * Known Implementations:
 * http://processors.wiki.ti.com/images/9/93/TMS570LS20216_USB_STICK_Schematic.pdf
 *
 * http://processors.wiki.ti.com/index.php/XDS100 (rev2)
 *  * CLPD logic: Rising edge to enable outputs (XDS100_PWR_RST)
 *      * ACBUS3 to transition 0->1 (OE rising edge)
 *  * CPLD logic: Put the EMU0/1 pins in Hi-Z:
 *      * ADBUS5/GPIOL1 = EMU_EN = 1
 *      * ADBUS6/GPIOL2 = EMU0 = 0
 *      * ACBUS4/SPARE0 = EMU1 = 0
 *  * CPLD logic: Disable loopback
 *      * ACBUS6/SPARE2 = LOOPBACK = 0
 */
#define XDS100_nEMU_EN  (1<<5)
#define XDS100_nEMU0    (1<<6)

#define XDS100_PWR_RST  (1<<3)
#define XDS100_nEMU1    (1<<4)
#define XDS100_LOOPBACK (1<<6)
static int xds100v2_init(void)
{
    /* These are in the lower byte */
    nTRST    = 0x10;
    nTRSTnOE = 0x10;

    /* These aren't actually used on 14 pin connectors
     * These are in the upper byte */
    nSRST    = 0x01;
    nSRSTnOE = 0x01;

    low_output    = 0x08 | nTRST | XDS100_nEMU_EN;
    low_direction = 0x0b | nTRSTnOE | XDS100_nEMU_EN | XDS100_nEMU0;

    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'xds100v2' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    high_output = 0;
    high_direction = nSRSTnOE | XDS100_LOOPBACK | XDS100_PWR_RST | XDS100_nEMU1;

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't put CPLD in to reset with 'xds100v2' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    high_output |= XDS100_PWR_RST;

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't bring CPLD out of reset with 'xds100v2' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static void olimex_jtag_blink(void)
{
    /* Olimex ARM-USB-OCD has a LED connected to ACBUS3
     * ACBUS3 is bit 3 of the GPIOH port
     */
    high_output ^= 0x08;

    buffer_write(0x82);
    buffer_write(high_output);
    buffer_write(high_direction);
}

static void flyswatter_jtag_blink(unsigned char led)
{
    buffer_write(0x82);
    buffer_write(high_output ^ led);
    buffer_write(high_direction);
}

static void flyswatter1_jtag_blink(void)
{
    /*
     * Flyswatter has two LEDs connected to ACBUS2 and ACBUS3
     */
    flyswatter_jtag_blink(0xc);
}

static void flyswatter2_jtag_blink(void)
{
    /*
     * Flyswatter2 only has one LED connected to ACBUS2
     */
    flyswatter_jtag_blink(0x4);
}

static void turtle_jtag_blink(void)
{
    /*
     * Turtelizer2 has two LEDs connected to ACBUS2 and ACBUS3
     */
    if (high_output & 0x08)
        high_output = 0x04;
    else
        high_output = 0x08;

    buffer_write(0x82);
    buffer_write(high_output);
    buffer_write(high_direction);
}

static void lisa_l_blink(void)
{
    /*
     * Lisa/L has two LEDs connected to BCBUS3 and BCBUS4
     */
    if (high_output & 0x10)
        high_output = 0x08;
    else
        high_output = 0x10;

    buffer_write(0x82);
    buffer_write(high_output);
    buffer_write(high_direction);
}

static void flossjtag_blink(void)
{
    /*
     * Floss-JTAG has two LEDs connected to ACBUS3 and ACBUS4
     */
    if (high_output & 0x10)
        high_output = 0x08;
    else
        high_output = 0x10;

    buffer_write(0x82);
    buffer_write(high_output);
    buffer_write(high_direction);
}

static int ft2232_quit(void)
{
#if BUILD_FT2232_FTD2XX == 1

    FT_Close(ftdih);
#elif BUILD_FT2232_LIBFTDI == 1
    ftdi_usb_close(&ftdic);

    ftdi_deinit(&ftdic);
#endif

    free(ft2232_buffer);
    ft2232_buffer = NULL;

    return ERROR_OK;
}

COMMAND_HANDLER(ft2232_handle_device_desc_command)
{
    char *cp;
    char buf[200];
    if (CMD_ARGC == 1) {
        ft2232_device_desc = strdup(CMD_ARGV[0]);
        cp = strchr(ft2232_device_desc, 0);
        /* under Win32, the FTD2XX driver appends an "A" to the end
         * of the description, this examines the given desc
         * and creates the 'missing' _A or non_A variable. */
        if ((cp[-1] == 'A') && (cp[-2] == ' ')) {
            /* it was, so make this the "A" version. */
            ft2232_device_desc_A = ft2232_device_desc;
            /* and *CREATE* the non-A version. */
            strcpy(buf, ft2232_device_desc);
            cp = strchr(buf, 0);
            cp[-2] = 0;
            ft2232_device_desc = strdup(buf);
        } else {
            /* <space > A not defined
             * so create it */
            sprintf(buf, "%s A", ft2232_device_desc);
            ft2232_device_desc_A = strdup(buf);
        }
    } else
        LOG_ERROR("expected exactly one argument to ft2232_device_desc <description>");

    return ERROR_OK;
}

COMMAND_HANDLER(ft2232_handle_serial_command)
{
    if (CMD_ARGC == 1)
        ft2232_serial = strdup(CMD_ARGV[0]);
    else
        return ERROR_COMMAND_SYNTAX_ERROR;

    return ERROR_OK;
}

COMMAND_HANDLER(ft2232_handle_layout_command)
{
    if (CMD_ARGC != 1)
        return ERROR_COMMAND_SYNTAX_ERROR;

    if (layout) {
        LOG_ERROR("already specified ft2232_layout %s",
            layout->name);
        return (strcmp(layout->name, CMD_ARGV[0]) != 0)
               ? ERROR_FAIL
               : ERROR_OK;
    }

    for (const struct ft2232_layout *l = ft2232_layouts; l->name; l++) {
        if (strcmp(l->name, CMD_ARGV[0]) == 0) {
            layout = l;
            ft2232_channel = l->channel;
            return ERROR_OK;
        }
    }

    LOG_ERROR("No FT2232 layout '%s' found", CMD_ARGV[0]);
    return ERROR_FAIL;
}

COMMAND_HANDLER(ft2232_handle_vid_pid_command)
{
    if (CMD_ARGC > MAX_USB_IDS * 2) {
        LOG_WARNING("ignoring extra IDs in ft2232_vid_pid "
            "(maximum is %d pairs)", MAX_USB_IDS);
        CMD_ARGC = MAX_USB_IDS * 2;
    }
    if (CMD_ARGC < 2 || (CMD_ARGC & 1)) {
        LOG_WARNING("incomplete ft2232_vid_pid configuration directive");
        if (CMD_ARGC < 2)
            return ERROR_COMMAND_SYNTAX_ERROR;
        /* remove the incomplete trailing id */
        CMD_ARGC -= 1;
    }

    unsigned i;
    for (i = 0; i < CMD_ARGC; i += 2) {
        COMMAND_PARSE_NUMBER(u16, CMD_ARGV[i], ft2232_vid[i >> 1]);
        COMMAND_PARSE_NUMBER(u16, CMD_ARGV[i + 1], ft2232_pid[i >> 1]);
    }

    /*
     * Explicitly terminate, in case there are multiples instances of
     * ft2232_vid_pid.
     */
    ft2232_vid[i >> 1] = ft2232_pid[i >> 1] = 0;

    return ERROR_OK;
}

COMMAND_HANDLER(ft2232_handle_latency_command)
{
    if (CMD_ARGC == 1)
        ft2232_latency = atoi(CMD_ARGV[0]);
    else
        return ERROR_COMMAND_SYNTAX_ERROR;

    return ERROR_OK;
}

COMMAND_HANDLER(ft2232_handle_channel_command)
{
    if (CMD_ARGC == 1) {
        ft2232_channel = atoi(CMD_ARGV[0]);
        if (ft2232_channel < 0 || ft2232_channel > 4)
            LOG_ERROR("ft2232_channel must be in the 0 to 4 range");
    } else
        LOG_ERROR("expected exactly one argument to ft2232_channel <ch>");

    return ERROR_OK;
}

static int ft2232_stableclocks(int num_cycles, struct jtag_command *cmd)
{
    int retval = 0;

    /* 7 bits of either ones or zeros. */
    uint8_t tms = (tap_get_state() == TAP_RESET ? 0x7F : 0x00);

    while (num_cycles > 0) {
        /* the command 0x4b, "Clock Data to TMS/CS Pin (no Read)" handles
         * at most 7 bits per invocation.  Here we invoke it potentially
         * several times.
         */
        int bitcount_per_command = (num_cycles > 7) ? 7 : num_cycles;

        if (ft2232_buffer_size + 3 >= FT2232_BUFFER_SIZE) {
            if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
                retval = ERROR_JTAG_QUEUE_FAILED;

            first_unsent = cmd;
        }

        /* there are no state transitions in this code, so omit state tracking */

        /* command "Clock Data to TMS/CS Pin (no Read)" */
        buffer_write(0x4b);

        /* scan 7 bit */
        buffer_write(bitcount_per_command - 1);

        /* TMS data bits are either all zeros or ones to stay in the current stable state */
        buffer_write(tms);

        require_send = 1;

        num_cycles -= bitcount_per_command;
    }

    return retval;
}

/* ---------------------------------------------------------------------
 * Support for IceBear JTAG adapter from Section5:
 *  http://section5.ch/icebear
 *
 * Author: Sten, debian@sansys-electronic.com
 */

/* Icebear pin layout
 *
 * ADBUS5 (nEMU) nSRST  | 2   1|    GND (10k->VCC)
 * GND GND      | 4   3|    n.c.
 * ADBUS3 TMS       | 6   5|    ADBUS6 VCC
 * ADBUS0 TCK       | 8   7|    ADBUS7 (GND)
 * ADBUS4 nTRST     |10   9|    ACBUS0 (GND)
 * ADBUS1 TDI       |12  11|    ACBUS1 (GND)
 * ADBUS2 TDO       |14  13|    GND GND
 *
 * ADBUS0 O L TCK       ACBUS0 GND
 * ADBUS1 O L TDI       ACBUS1 GND
 * ADBUS2 I   TDO       ACBUS2 n.c.
 * ADBUS3 O H TMS       ACBUS3 n.c.
 * ADBUS4 O H nTRST
 * ADBUS5 O H nSRST
 * ADBUS6 -   VCC
 * ADBUS7 -   GND
 */
static int icebear_jtag_init(void)
{
    low_direction   = 0x0b; /* output: TCK TDI TMS; input: TDO */
    low_output      = 0x08; /* high: TMS; low: TCK TDI */
    nTRST           = 0x10;
    nSRST           = 0x20;

    enum reset_types jtag_reset_config = jtag_get_reset_config();
    if ((jtag_reset_config & RESET_TRST_OPEN_DRAIN) != 0)
        low_direction   &= ~nTRST;  /* nTRST high impedance */
    else {
        low_direction   |= nTRST;
        low_output      |= nTRST;
    }

    low_direction   |= nSRST;
    low_output      |= nSRST;

    /* initialize low byte for jtag */
    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'IceBear' layout (low)");
        return ERROR_JTAG_INIT_FAILED;
    }

    high_output    = 0x0;
    high_direction = 0x00;

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'IceBear' layout (high)");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static void icebear_jtag_reset(int trst, int srst)
{
    if (trst == 1) {
        low_direction   |= nTRST;
        low_output      &= ~nTRST;
    } else if (trst == 0) {
        enum reset_types jtag_reset_config = jtag_get_reset_config();
        if ((jtag_reset_config & RESET_TRST_OPEN_DRAIN) != 0)
            low_direction   &= ~nTRST;
        else
            low_output      |= nTRST;
    }

    if (srst == 1)
        low_output &= ~nSRST;
    else if (srst == 0)
        low_output |= nSRST;

    /* command "set data bits low byte" */
    buffer_write(0x80);
    buffer_write(low_output);
    buffer_write(low_direction);

    LOG_DEBUG("trst: %i, srst: %i, low_output: 0x%2.2x, low_direction: 0x%2.2x",
        trst,
        srst,
        low_output,
        low_direction);
}

/* ---------------------------------------------------------------------
 * Support for Signalyzer H2 and Signalyzer H4
 * JTAG adapter from Xverve Technologies Inc.
 * http://www.signalyzer.com or http://www.xverve.com
 *
 * Author: Oleg Seiljus, oleg@signalyzer.com
 */
static unsigned char signalyzer_h_side;
static unsigned int signalyzer_h_adapter_type;

static int signalyzer_h_ctrl_write(int address, unsigned short value);

#if BUILD_FT2232_FTD2XX == 1
static int signalyzer_h_ctrl_read(int address, unsigned short *value);
#endif

#define SIGNALYZER_COMMAND_ADDR                 128
#define SIGNALYZER_DATA_BUFFER_ADDR             129

#define SIGNALYZER_COMMAND_VERSION              0x41
#define SIGNALYZER_COMMAND_RESET                0x42
#define SIGNALYZER_COMMAND_POWERCONTROL_GET     0x50
#define SIGNALYZER_COMMAND_POWERCONTROL_SET     0x51
#define SIGNALYZER_COMMAND_PWM_SET              0x52
#define SIGNALYZER_COMMAND_LED_SET              0x53
#define SIGNALYZER_COMMAND_ADC                  0x54
#define SIGNALYZER_COMMAND_GPIO_STATE           0x55
#define SIGNALYZER_COMMAND_GPIO_MODE            0x56
#define SIGNALYZER_COMMAND_GPIO_PORT            0x57
#define SIGNALYZER_COMMAND_I2C                  0x58

#define SIGNALYZER_CHAN_A                       1
#define SIGNALYZER_CHAN_B                       2
/* LEDS use channel C */
#define SIGNALYZER_CHAN_C                       4

#define SIGNALYZER_LED_GREEN                    1
#define SIGNALYZER_LED_RED                      2

#define SIGNALYZER_MODULE_TYPE_EM_LT16_A        0x0301
#define SIGNALYZER_MODULE_TYPE_EM_ARM_JTAG      0x0302
#define SIGNALYZER_MODULE_TYPE_EM_JTAG          0x0303
#define SIGNALYZER_MODULE_TYPE_EM_ARM_JTAG_P    0x0304
#define SIGNALYZER_MODULE_TYPE_EM_JTAG_P        0x0305


static int signalyzer_h_ctrl_write(int address, unsigned short value)
{
#if BUILD_FT2232_FTD2XX == 1
    return FT_WriteEE(ftdih, address, value);
#elif BUILD_FT2232_LIBFTDI == 1
    return 0;
#endif
}

#if BUILD_FT2232_FTD2XX == 1
static int signalyzer_h_ctrl_read(int address, unsigned short *value)
{
    return FT_ReadEE(ftdih, address, value);
}
#endif

static int signalyzer_h_led_set(unsigned char channel, unsigned char led,
    int on_time_ms, int off_time_ms, unsigned char cycles)
{
    unsigned char on_time;
    unsigned char off_time;

    if (on_time_ms < 0xFFFF)
        on_time = (unsigned char)(on_time_ms / 62);
    else
        on_time = 0xFF;

    off_time = (unsigned char)(off_time_ms / 62);

#if BUILD_FT2232_FTD2XX == 1
    FT_STATUS status;

    status = signalyzer_h_ctrl_write(SIGNALYZER_DATA_BUFFER_ADDR,
            ((uint32_t)(channel << 8) | led));
    if (status != FT_OK) {
        LOG_ERROR("signalyzer_h_ctrl_write  returned: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    status = signalyzer_h_ctrl_write((SIGNALYZER_DATA_BUFFER_ADDR + 1),
            ((uint32_t)(on_time << 8) | off_time));
    if (status != FT_OK) {
        LOG_ERROR("signalyzer_h_ctrl_write  returned: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    status = signalyzer_h_ctrl_write((SIGNALYZER_DATA_BUFFER_ADDR + 2),
            ((uint32_t)cycles));
    if (status != FT_OK) {
        LOG_ERROR("signalyzer_h_ctrl_write  returned: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    status = signalyzer_h_ctrl_write(SIGNALYZER_COMMAND_ADDR,
                SIGNALYZER_COMMAND_LED_SET);
    if (status != FT_OK) {
        LOG_ERROR("signalyzer_h_ctrl_write  returned: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    return ERROR_OK;
#elif BUILD_FT2232_LIBFTDI == 1
    int retval;

    retval = signalyzer_h_ctrl_write(SIGNALYZER_DATA_BUFFER_ADDR,
                ((uint32_t)(channel << 8) | led));
    if (retval < 0) {
        LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
            ftdi_get_error_string(&ftdic));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    retval = signalyzer_h_ctrl_write((SIGNALYZER_DATA_BUFFER_ADDR + 1),
            ((uint32_t)(on_time << 8) | off_time));
    if (retval < 0) {
        LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
            ftdi_get_error_string(&ftdic));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    retval = signalyzer_h_ctrl_write((SIGNALYZER_DATA_BUFFER_ADDR + 2),
            (uint32_t)cycles);
    if (retval < 0) {
        LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
            ftdi_get_error_string(&ftdic));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    retval = signalyzer_h_ctrl_write(SIGNALYZER_COMMAND_ADDR,
            SIGNALYZER_COMMAND_LED_SET);
    if (retval < 0) {
        LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
            ftdi_get_error_string(&ftdic));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    return ERROR_OK;
#endif
}

static int signalyzer_h_init(void)
{
#if BUILD_FT2232_FTD2XX == 1
    FT_STATUS status;
    int i;
#endif

    char *end_of_desc;

    uint16_t read_buf[12] = { 0 };

    /* turn on center green led */
    signalyzer_h_led_set(SIGNALYZER_CHAN_C, SIGNALYZER_LED_GREEN,
        0xFFFF, 0x00, 0x00);

    /* determine what channel config wants to open
     * TODO: change me... current implementation is made to work
     * with openocd description parsing.
     */
    end_of_desc = strrchr(ft2232_device_desc, 0x00);

    if (end_of_desc) {
        signalyzer_h_side = *(end_of_desc - 1);
        if (signalyzer_h_side == 'B')
            signalyzer_h_side = SIGNALYZER_CHAN_B;
        else
            signalyzer_h_side = SIGNALYZER_CHAN_A;
    } else {
        LOG_ERROR("No Channel was specified");
        return ERROR_FAIL;
    }

    signalyzer_h_led_set(signalyzer_h_side, SIGNALYZER_LED_GREEN,
        1000, 1000, 0xFF);

#if BUILD_FT2232_FTD2XX == 1
    /* read signalyzer versionining information */
    status = signalyzer_h_ctrl_write(SIGNALYZER_COMMAND_ADDR,
            SIGNALYZER_COMMAND_VERSION);
    if (status != FT_OK) {
        LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    for (i = 0; i < 10; i++) {
        status = signalyzer_h_ctrl_read((SIGNALYZER_DATA_BUFFER_ADDR + i),
                &read_buf[i]);
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_read returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }
    }

    LOG_INFO("Signalyzer: ID info: { %.4x %.4x %.4x %.4x %.4x %.4x %.4x }",
        read_buf[0], read_buf[1], read_buf[2], read_buf[3],
        read_buf[4], read_buf[5], read_buf[6]);

    /* set gpio register */
    status = signalyzer_h_ctrl_write(SIGNALYZER_DATA_BUFFER_ADDR,
            (uint32_t)(signalyzer_h_side << 8));
    if (status != FT_OK) {
        LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    status = signalyzer_h_ctrl_write(SIGNALYZER_DATA_BUFFER_ADDR + 1, 0x0404);
    if (status != FT_OK) {
        LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    status = signalyzer_h_ctrl_write(SIGNALYZER_COMMAND_ADDR,
            SIGNALYZER_COMMAND_GPIO_STATE);
    if (status != FT_OK) {
        LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    /* read adapter type information */
    status = signalyzer_h_ctrl_write(SIGNALYZER_DATA_BUFFER_ADDR,
            ((uint32_t)(signalyzer_h_side << 8) | 0x01));
    if (status != FT_OK) {
        LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    status = signalyzer_h_ctrl_write(
            (SIGNALYZER_DATA_BUFFER_ADDR + 1), 0xA000);
    if (status != FT_OK) {
        LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    status = signalyzer_h_ctrl_write(
            (SIGNALYZER_DATA_BUFFER_ADDR + 2), 0x0008);
    if (status != FT_OK) {
        LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    status = signalyzer_h_ctrl_write(SIGNALYZER_COMMAND_ADDR,
            SIGNALYZER_COMMAND_I2C);
    if (status != FT_OK) {
        LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    usleep(100000);

    status = signalyzer_h_ctrl_read(SIGNALYZER_COMMAND_ADDR, &read_buf[0]);
    if (status != FT_OK) {
        LOG_ERROR("signalyzer_h_ctrl_read returned: %s",
            ftd2xx_status_string(status));
        return ERROR_JTAG_DEVICE_ERROR;
    }

    if (read_buf[0] != 0x0498)
        signalyzer_h_adapter_type = 0x0000;
    else {
        for (i = 0; i < 4; i++) {
            status = signalyzer_h_ctrl_read((SIGNALYZER_DATA_BUFFER_ADDR + i), &read_buf[i]);
            if (status != FT_OK) {
                LOG_ERROR("signalyzer_h_ctrl_read returned: %s",
                    ftd2xx_status_string(status));
                return ERROR_JTAG_DEVICE_ERROR;
            }
        }

        signalyzer_h_adapter_type = read_buf[0];
    }

#elif BUILD_FT2232_LIBFTDI == 1
    /* currently libftdi does not allow reading individual eeprom
     * locations, therefore adapter type cannot be detected.
     * override with most common type
     */
    signalyzer_h_adapter_type = SIGNALYZER_MODULE_TYPE_EM_ARM_JTAG;
#endif

    enum reset_types jtag_reset_config = jtag_get_reset_config();

    /* ADAPTOR: EM_LT16_A */
    if (signalyzer_h_adapter_type == SIGNALYZER_MODULE_TYPE_EM_LT16_A) {
        LOG_INFO("Signalyzer: EM-LT (16-channel level translator) "
            "detected. (HW: %2x).", (read_buf[1] >> 8));

        nTRST    = 0x10;
        nTRSTnOE = 0x10;
        nSRST    = 0x20;
        nSRSTnOE = 0x20;

        low_output     = 0x08;
        low_direction  = 0x1b;

        high_output    = 0x0;
        high_direction = 0x0;

        if (jtag_reset_config & RESET_TRST_OPEN_DRAIN) {
            low_direction &= ~nTRSTnOE; /* nTRST input */
            low_output    &= ~nTRST;    /* nTRST = 0 */
        } else {
            low_direction |= nTRSTnOE;  /* nTRST output */
            low_output    |= nTRST;     /* nTRST = 1 */
        }

        if (jtag_reset_config & RESET_SRST_PUSH_PULL) {
            low_direction |= nSRSTnOE;  /* nSRST output */
            low_output    |= nSRST;     /* nSRST = 1 */
        } else {
            low_direction &= ~nSRSTnOE; /* nSRST input */
            low_output    &= ~nSRST;    /* nSRST = 0 */
        }

#if BUILD_FT2232_FTD2XX == 1
        /* enable power to the module */
        status = signalyzer_h_ctrl_write(SIGNALYZER_DATA_BUFFER_ADDR,
                ((uint32_t)(signalyzer_h_side << 8) | 0x01));
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }

        status = signalyzer_h_ctrl_write(SIGNALYZER_COMMAND_ADDR,
                SIGNALYZER_COMMAND_POWERCONTROL_SET);
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }

        /* set gpio mode register */
        status = signalyzer_h_ctrl_write(SIGNALYZER_DATA_BUFFER_ADDR,
                (uint32_t)(signalyzer_h_side << 8));
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }

        status = signalyzer_h_ctrl_write(SIGNALYZER_DATA_BUFFER_ADDR + 1, 0x0000);
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }

        status = signalyzer_h_ctrl_write(SIGNALYZER_COMMAND_ADDR, SIGNALYZER_COMMAND_GPIO_MODE);
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }

        /* set gpio register */
        status = signalyzer_h_ctrl_write(SIGNALYZER_DATA_BUFFER_ADDR,
                (uint32_t)(signalyzer_h_side << 8));
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }

        status = signalyzer_h_ctrl_write(SIGNALYZER_DATA_BUFFER_ADDR + 1, 0x4040);
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }

        status = signalyzer_h_ctrl_write(SIGNALYZER_COMMAND_ADDR,
                SIGNALYZER_COMMAND_GPIO_STATE);
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }
#endif
    }
    /* ADAPTOR: EM_ARM_JTAG, EM_ARM_JTAG_P, EM_JTAG, EM_JTAG_P */
    else if ((signalyzer_h_adapter_type == SIGNALYZER_MODULE_TYPE_EM_ARM_JTAG) ||
         (signalyzer_h_adapter_type == SIGNALYZER_MODULE_TYPE_EM_ARM_JTAG_P) ||
         (signalyzer_h_adapter_type == SIGNALYZER_MODULE_TYPE_EM_JTAG)  ||
         (signalyzer_h_adapter_type == SIGNALYZER_MODULE_TYPE_EM_JTAG_P)) {
        if (signalyzer_h_adapter_type
            == SIGNALYZER_MODULE_TYPE_EM_ARM_JTAG)
            LOG_INFO("Signalyzer: EM-ARM-JTAG (ARM JTAG) "
                "detected. (HW: %2x).", (read_buf[1] >> 8));
        else if (signalyzer_h_adapter_type
             == SIGNALYZER_MODULE_TYPE_EM_ARM_JTAG_P)
            LOG_INFO("Signalyzer: EM-ARM-JTAG_P "
                "(ARM JTAG with PSU) detected. (HW: %2x).",
                (read_buf[1] >> 8));
        else if (signalyzer_h_adapter_type
             == SIGNALYZER_MODULE_TYPE_EM_JTAG)
            LOG_INFO("Signalyzer: EM-JTAG (Generic JTAG) "
                "detected. (HW: %2x).", (read_buf[1] >> 8));
        else if (signalyzer_h_adapter_type
             == SIGNALYZER_MODULE_TYPE_EM_JTAG_P)
            LOG_INFO("Signalyzer: EM-JTAG-P "
                "(Generic JTAG with PSU) detected. (HW: %2x).",
                (read_buf[1] >> 8));

        nTRST          = 0x02;
        nTRSTnOE       = 0x04;
        nSRST          = 0x08;
        nSRSTnOE       = 0x10;

        low_output     = 0x08;
        low_direction  = 0x1b;

        high_output    = 0x0;
        high_direction = 0x1f;

        if (jtag_reset_config & RESET_TRST_OPEN_DRAIN) {
            high_output |= nTRSTnOE;
            high_output &= ~nTRST;
        } else {
            high_output &= ~nTRSTnOE;
            high_output |= nTRST;
        }

        if (jtag_reset_config & RESET_SRST_PUSH_PULL) {
            high_output &= ~nSRSTnOE;
            high_output |= nSRST;
        } else {
            high_output |= nSRSTnOE;
            high_output &= ~nSRST;
        }

#if BUILD_FT2232_FTD2XX == 1
        /* enable power to the module */
        status = signalyzer_h_ctrl_write(SIGNALYZER_DATA_BUFFER_ADDR,
                ((uint32_t)(signalyzer_h_side << 8) | 0x01));
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }

        status = signalyzer_h_ctrl_write(SIGNALYZER_COMMAND_ADDR,
                SIGNALYZER_COMMAND_POWERCONTROL_SET);
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }

        /* set gpio mode register (IO_16 and IO_17 set as analog
         * inputs, other is gpio)
         */
        status = signalyzer_h_ctrl_write(SIGNALYZER_DATA_BUFFER_ADDR,
                (uint32_t)(signalyzer_h_side << 8));
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }

        status = signalyzer_h_ctrl_write(SIGNALYZER_DATA_BUFFER_ADDR + 1, 0x0060);
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }

        status = signalyzer_h_ctrl_write(SIGNALYZER_COMMAND_ADDR, SIGNALYZER_COMMAND_GPIO_MODE);
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }

        /* set gpio register (all inputs, for -P modules,
         * PSU will be turned off)
         */
        status = signalyzer_h_ctrl_write(SIGNALYZER_DATA_BUFFER_ADDR,
                (uint32_t)(signalyzer_h_side << 8));
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }

        status = signalyzer_h_ctrl_write(SIGNALYZER_DATA_BUFFER_ADDR + 1, 0x0000);
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }

        status = signalyzer_h_ctrl_write(SIGNALYZER_COMMAND_ADDR, SIGNALYZER_COMMAND_GPIO_STATE);
        if (status != FT_OK) {
            LOG_ERROR("signalyzer_h_ctrl_write returned: %s",
                ftd2xx_status_string(status));
            return ERROR_JTAG_DEVICE_ERROR;
        }
#endif
    } else if (signalyzer_h_adapter_type == 0x0000) {
        LOG_INFO("Signalyzer: No external modules were detected.");

        nTRST    = 0x10;
        nTRSTnOE = 0x10;
        nSRST    = 0x20;
        nSRSTnOE = 0x20;

        low_output     = 0x08;
        low_direction  = 0x1b;

        high_output    = 0x0;
        high_direction = 0x0;

        if (jtag_reset_config & RESET_TRST_OPEN_DRAIN) {
            low_direction &= ~nTRSTnOE; /* nTRST input */
            low_output    &= ~nTRST;    /* nTRST = 0 */
        } else {
            low_direction |= nTRSTnOE;  /* nTRST output */
            low_output    |= nTRST;     /* nTRST = 1 */
        }

        if (jtag_reset_config & RESET_SRST_PUSH_PULL) {
            low_direction |= nSRSTnOE;  /* nSRST output */
            low_output    |= nSRST;     /* nSRST = 1 */
        } else {
            low_direction &= ~nSRSTnOE; /* nSRST input */
            low_output    &= ~nSRST;    /* nSRST = 0 */
        }
    } else {
        LOG_ERROR("Unknown module type is detected: %.4x",
            signalyzer_h_adapter_type);
        return ERROR_JTAG_DEVICE_ERROR;
    }

    /* initialize low byte of controller for jtag operation */
    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize Signalyzer-H layout");
        return ERROR_JTAG_INIT_FAILED;
    }

#if BUILD_FT2232_FTD2XX == 1
    if (ftdi_device == FT_DEVICE_2232H) {
        /* initialize high byte of controller for jtag operation */
        if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
            LOG_ERROR("couldn't initialize Signalyzer-H layout");
            return ERROR_JTAG_INIT_FAILED;
        }
    }
#elif BUILD_FT2232_LIBFTDI == 1
    if (ftdi_device == TYPE_2232H) {
        /* initialize high byte of controller for jtag operation */
        if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
            LOG_ERROR("couldn't initialize Signalyzer-H layout");
            return ERROR_JTAG_INIT_FAILED;
        }
    }
#endif
    return ERROR_OK;
}

static void signalyzer_h_reset(int trst, int srst)
{
    enum reset_types jtag_reset_config = jtag_get_reset_config();

    /* ADAPTOR: EM_LT16_A */
    if (signalyzer_h_adapter_type == SIGNALYZER_MODULE_TYPE_EM_LT16_A) {
        if (trst == 1) {
            if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
                /* switch to output pin (output is low) */
                low_direction |= nTRSTnOE;
            else
                /* switch output low */
                low_output &= ~nTRST;
        } else if (trst == 0) {
            if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
                /* switch to input pin (high-Z + internal
                 * and external pullup) */
                low_direction &= ~nTRSTnOE;
            else
                /* switch output high */
                low_output |= nTRST;
        }

        if (srst == 1) {
            if (jtag_reset_config & RESET_SRST_PUSH_PULL)
                /* switch output low */
                low_output &= ~nSRST;
            else
                /* switch to output pin (output is low) */
                low_direction |= nSRSTnOE;
        } else if (srst == 0) {
            if (jtag_reset_config & RESET_SRST_PUSH_PULL)
                /* switch output high */
                low_output |= nSRST;
            else
                /* switch to input pin (high-Z) */
                low_direction &= ~nSRSTnOE;
        }

        /* command "set data bits low byte" */
        buffer_write(0x80);
        buffer_write(low_output);
        buffer_write(low_direction);
        LOG_DEBUG("trst: %i, srst: %i, low_output: 0x%2.2x, "
            "low_direction: 0x%2.2x",
            trst, srst, low_output, low_direction);
    }
    /* ADAPTOR: EM_ARM_JTAG,  EM_ARM_JTAG_P, EM_JTAG, EM_JTAG_P */
    else if ((signalyzer_h_adapter_type == SIGNALYZER_MODULE_TYPE_EM_ARM_JTAG) ||
         (signalyzer_h_adapter_type == SIGNALYZER_MODULE_TYPE_EM_ARM_JTAG_P) ||
         (signalyzer_h_adapter_type == SIGNALYZER_MODULE_TYPE_EM_JTAG)  ||
         (signalyzer_h_adapter_type == SIGNALYZER_MODULE_TYPE_EM_JTAG_P)) {
        if (trst == 1) {
            if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
                high_output &= ~nTRSTnOE;
            else
                high_output &= ~nTRST;
        } else if (trst == 0) {
            if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
                high_output |= nTRSTnOE;
            else
                high_output |= nTRST;
        }

        if (srst == 1) {
            if (jtag_reset_config & RESET_SRST_PUSH_PULL)
                high_output &= ~nSRST;
            else
                high_output &= ~nSRSTnOE;
        } else if (srst == 0) {
            if (jtag_reset_config & RESET_SRST_PUSH_PULL)
                high_output |= nSRST;
            else
                high_output |= nSRSTnOE;
        }

        /* command "set data bits high byte" */
        buffer_write(0x82);
        buffer_write(high_output);
        buffer_write(high_direction);
        LOG_INFO("trst: %i, srst: %i, high_output: 0x%2.2x, "
            "high_direction: 0x%2.2x",
            trst, srst, high_output, high_direction);
    } else if (signalyzer_h_adapter_type == 0x0000) {
        if (trst == 1) {
            if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
                /* switch to output pin (output is low) */
                low_direction |= nTRSTnOE;
            else
                /* switch output low */
                low_output &= ~nTRST;
        } else if (trst == 0) {
            if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
                /* switch to input pin (high-Z + internal
                 * and external pullup) */
                low_direction &= ~nTRSTnOE;
            else
                /* switch output high */
                low_output |= nTRST;
        }

        if (srst == 1) {
            if (jtag_reset_config & RESET_SRST_PUSH_PULL)
                /* switch output low */
                low_output &= ~nSRST;
            else
                /* switch to output pin (output is low) */
                low_direction |= nSRSTnOE;
        } else if (srst == 0) {
            if (jtag_reset_config & RESET_SRST_PUSH_PULL)
                /* switch output high */
                low_output |= nSRST;
            else
                /* switch to input pin (high-Z) */
                low_direction &= ~nSRSTnOE;
        }

        /* command "set data bits low byte" */
        buffer_write(0x80);
        buffer_write(low_output);
        buffer_write(low_direction);
        LOG_DEBUG("trst: %i, srst: %i, low_output: 0x%2.2x, "
            "low_direction: 0x%2.2x",
            trst, srst, low_output, low_direction);
    }
}

static void signalyzer_h_blink(void)
{
    signalyzer_h_led_set(signalyzer_h_side, SIGNALYZER_LED_RED, 100, 0, 1);
}

/********************************************************************
 * Support for KT-LINK
 * JTAG adapter from KRISTECH
 * http://www.kristech.eu
 *******************************************************************/
static int ktlink_init(void)
{
    uint8_t swd_en = 0x20;  /* 0x20 SWD disable, 0x00 SWD enable (ADBUS5) */

    low_output    = 0x08 | swd_en;  /* value; TMS=1,TCK=0,TDI=0,SWD=swd_en */
    low_direction = 0x3B;       /* out=1; TCK/TDI/TMS=out,TDO=in,SWD=out,RTCK=in,SRSTIN=in */

    /* initialize low byte for jtag */
    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'ktlink' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    nTRST    = 0x01;
    nSRST    = 0x02;
    nTRSTnOE = 0x04;
    nSRSTnOE = 0x08;

    high_output    = 0x80;  /* turn LED on */
    high_direction = 0xFF;  /* all outputs */

    enum reset_types jtag_reset_config = jtag_get_reset_config();

    if (jtag_reset_config & RESET_TRST_OPEN_DRAIN) {
        high_output |= nTRSTnOE;
        high_output &= ~nTRST;
    } else {
        high_output &= ~nTRSTnOE;
        high_output |= nTRST;
    }

    if (jtag_reset_config & RESET_SRST_PUSH_PULL) {
        high_output &= ~nSRSTnOE;
        high_output |= nSRST;
    } else {
        high_output |= nSRSTnOE;
        high_output &= ~nSRST;
    }

    /* initialize high byte for jtag */
    if (ft2232_set_data_bits_high_byte(high_output, high_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'ktlink' layout");
        return ERROR_JTAG_INIT_FAILED;
    }

    return ERROR_OK;
}

static void ktlink_reset(int trst, int srst)
{
    enum reset_types jtag_reset_config = jtag_get_reset_config();

    if (trst == 1) {
        if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
            high_output &= ~nTRSTnOE;
        else
            high_output &= ~nTRST;
    } else if (trst == 0) {
        if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
            high_output |= nTRSTnOE;
        else
            high_output |= nTRST;
    }

    if (srst == 1) {
        if (jtag_reset_config & RESET_SRST_PUSH_PULL)
            high_output &= ~nSRST;
        else
            high_output &= ~nSRSTnOE;
    } else if (srst == 0) {
        if (jtag_reset_config & RESET_SRST_PUSH_PULL)
            high_output |= nSRST;
        else
            high_output |= nSRSTnOE;
    }

    buffer_write(0x82); /* command "set data bits high byte" */
    buffer_write(high_output);
    buffer_write(high_direction);
    LOG_DEBUG("trst: %i, srst: %i, high_output: 0x%2.2x, high_direction: 0x%2.2x",
        trst,
        srst,
        high_output,
        high_direction);
}

static void ktlink_blink(void)
{
    /* LED connected to ACBUS7 */
    high_output ^= 0x80;

    buffer_write(0x82); /* command "set data bits high byte" */
    buffer_write(high_output);
    buffer_write(high_direction);
}

/********************************************************************
 * Support for Digilent HS-1
 * JTAG adapter from Digilent
 * http://www.digilent.com
 * Author: Stephane Bonnet bonnetst@hds.utc.fr
 *******************************************************************/

static int digilent_hs1_init(void)
{
    /* the adapter only supports the base JTAG signals, no nTRST
       nor nSRST */
    low_output  = 0x88;
    low_direction   = 0x8b;

    /* initialize low byte for jtag */
    if (ft2232_set_data_bits_low_byte(low_output, low_direction) != ERROR_OK) {
        LOG_ERROR("couldn't initialize FT2232 with 'digilent_hs1' layout");
        return ERROR_JTAG_INIT_FAILED;
    }
    return ERROR_OK;
}

static void digilent_hs1_reset(int trst, int srst)
{
    /* Dummy function, no reset signals supported. */
}

static const struct command_registration ft2232_command_handlers[] = {
    {
        .name = "ft2232_device_desc",
        .handler = &ft2232_handle_device_desc_command,
        .mode = COMMAND_CONFIG,
        .help = "set the USB device description of the FTDI FT2232 device",
        .usage = "description_string",
    },
    {
        .name = "ft2232_serial",
        .handler = &ft2232_handle_serial_command,
        .mode = COMMAND_CONFIG,
        .help = "set the serial number of the FTDI FT2232 device",
        .usage = "serial_string",
    },
    {
        .name = "ft2232_layout",
        .handler = &ft2232_handle_layout_command,
        .mode = COMMAND_CONFIG,
        .help = "set the layout of the FT2232 GPIO signals used "
            "to control output-enables and reset signals",
        .usage = "layout_name",
    },
    {
        .name = "ft2232_vid_pid",
        .handler = &ft2232_handle_vid_pid_command,
        .mode = COMMAND_CONFIG,
        .help = "the vendor ID and product ID of the FTDI FT2232 device",
        .usage = "(vid pid)* ",
    },
    {
        .name = "ft2232_latency",
        .handler = &ft2232_handle_latency_command,
        .mode = COMMAND_CONFIG,
        .help = "set the FT2232 latency timer to a new value",
        .usage = "value",
    },
    {
        .name = "ft2232_channel",
        .handler = &ft2232_handle_channel_command,
        .mode = COMMAND_CONFIG,
        .help = "set the FT2232 channel to a new value",
        .usage = "value",
    },
    COMMAND_REGISTRATION_DONE
};

struct jtag_interface ft2232_interface = {
    .name = "ft2232",
    .supported = DEBUG_CAP_TMS_SEQ,
    .commands = ft2232_command_handlers,
    .transports = jtag_only,

    .init = ft2232_init,
    .quit = ft2232_quit,
    .speed = ft2232_speed,
    .speed_div = ft2232_speed_div,
    .khz = ft2232_khz,
    .execute_queue = ft2232_execute_queue,
};