dsp5680xx.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *  Copyright (C) 2011 by Rodrigo L. Rosa                                 *
 *  rodrigorosa.LG@gmail.com                                              *
 *                                                                        *
 *  Based on dsp563xx_once.h written by Mathias Kuester                   *
 *  mkdorg@users.sourceforge.net                                          *
 ***************************************************************************/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "target.h"
#include "target_type.h"
#include "dsp5680xx.h"
 
static struct dsp5680xx_common dsp5680xx_context;
 
#define _E "DSP5680XX_ERROR:%d\nAt:%s:%d:%s"
#define err_log(c, m) LOG_ERROR(_E, c, __func__, __LINE__, m)
#define DEBUG_MSG "Debug mode be enabled to read mem."
#define HALT_MSG "Target must be halted."
 
static int dsp5680xx_execute_queue(void)
{
    return jtag_execute_queue();
}
 
static int reset_jtag(void)
{
    int retval = jtag_add_statemove(TAP_RESET);
    if (retval != ERROR_OK)
        return retval;
    return jtag_execute_queue();
}
 
static int dsp5680xx_drscan(struct target *target, uint8_t *d_in,
                uint8_t *d_out, int len)
{
    /* -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
     *
     *Inputs:
     *    - d_in: This is the data that will be shifted into the JTAG DR reg.
     *    - d_out: The data that will be shifted out of the JTAG DR reg will stored here
     *    - len: Length of the data to be shifted to JTAG DR.
     *
     *Note:  If  d_out   ==  NULL, discard incoming bits.
     *
     *-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
     */
    if (!target->tap) {
        err_log(DSP5680XX_ERROR_JTAG_INVALID_TAP, "Invalid tap");
        return ERROR_FAIL;
    }
    if (len > 32) {
        err_log(DSP5680XX_ERROR_JTAG_DR_LEN_OVERFLOW,
              "dr_len overflow, maximum is 32");
        return ERROR_FAIL;
    }
    /* TODO what values of len are valid for jtag_add_plain_dr_scan? */
    /* can i send as many bits as i want? */
    /* is the casting necessary? */
    jtag_add_plain_dr_scan(len, d_in, d_out, TAP_IDLE);
    if (dsp5680xx_context.flush) {
        int retval = dsp5680xx_execute_queue();
        if (retval != ERROR_OK) {
            err_log(DSP5680XX_ERROR_JTAG_DRSCAN, "drscan failed!");
            return retval;
        }
    }
    if (d_out)
        LOG_DEBUG("Data read (%d bits): 0x%04X", len, *d_out);
    else
        LOG_DEBUG("Data read was discarded.");
    return ERROR_OK;
}
 
static int dsp5680xx_irscan(struct target *target, uint32_t *d_in,
                uint32_t *d_out, uint8_t ir_len)
{
    uint16_t tap_ir_len = DSP5680XX_JTAG_MASTER_TAP_IRLEN;
 
    if (!target || !target->tap) {
        err_log(DSP5680XX_ERROR_JTAG_INVALID_TAP, "Invalid tap");
        return ERROR_FAIL;
    }
    if (ir_len != target->tap->ir_length) {
        if (target->tap->enabled) {
            err_log(DSP5680XX_ERROR_INVALID_IR_LEN, "Invalid irlen");
            return ERROR_FAIL;
        } else {
            struct jtag_tap *t =
                jtag_tap_by_string("dsp568013.chp");
            if ((!t)
                || ((t->enabled) && (ir_len != tap_ir_len))) {
                err_log(DSP5680XX_ERROR_INVALID_IR_LEN, "Invalid irlen");
                return ERROR_FAIL;
            }
        }
    }
    jtag_add_plain_ir_scan(ir_len, (uint8_t *) d_in, (uint8_t *) d_out,
                   TAP_IDLE);
    if (dsp5680xx_context.flush) {
        int retval = dsp5680xx_execute_queue();
        if (retval != ERROR_OK) {
            err_log(DSP5680XX_ERROR_JTAG_IRSCAN, "irscan failed!");
            return retval;
        }
    }
    return ERROR_OK;
}
 
static int dsp5680xx_jtag_status(struct target *target, uint8_t *status)
{
    uint32_t read_from_ir;
 
    uint32_t instr = JTAG_INSTR_ENABLE_ONCE;
 
    int retval =
        dsp5680xx_irscan(target, &instr, &read_from_ir,
                 DSP5680XX_JTAG_CORE_TAP_IRLEN);
    if (retval != ERROR_OK)
        return retval;
    if (status)
        *status = (uint8_t) read_from_ir;
    return ERROR_OK;
}
 
static int jtag_data_read(struct target *target, uint8_t *data_read,
              int num_bits)
{
    uint32_t bogus_instr = 0;
 
    int retval =
        dsp5680xx_drscan(target, (uint8_t *) &bogus_instr, data_read,
                 num_bits);
    LOG_DEBUG("Data read (%d bits): 0x%04X", num_bits, *data_read);
    return retval;
}
 
#define jtag_data_read8(target, data_read)  jtag_data_read(target, data_read, 8)
#define jtag_data_read16(target, data_read) jtag_data_read(target, data_read, 16)
#define jtag_data_read32(target, data_read) jtag_data_read(target, data_read, 32)
 
static uint32_t data_read_dummy;
 
static int jtag_data_write(struct target *target, uint32_t instr, int num_bits,
               uint32_t *data_read)
{
    int retval =
        dsp5680xx_drscan(target, (uint8_t *) &instr,
                 (uint8_t *) &data_read_dummy, num_bits);
    if (retval != ERROR_OK)
        return retval;
    if (data_read)
        *data_read = data_read_dummy;
    return ERROR_OK;
}
 
#define jtag_data_write8(target, instr, data_read)  jtag_data_write(target, instr, 8, data_read)
#define jtag_data_write16(target, instr, data_read) jtag_data_write(target, instr, 16, data_read)
#define jtag_data_write24(target, instr, data_read) jtag_data_write(target, instr, 24, data_read)
#define jtag_data_write32(target, instr, data_read) jtag_data_write(target, instr, 32, data_read)
 
static int eonce_instruction_exec_single(struct target *target, uint8_t instr,
                     uint8_t rw, uint8_t go, uint8_t ex,
                     uint8_t *eonce_status)
{
    uint32_t dr_out_tmp;
 
    uint8_t instr_with_flags = instr | (rw << 7) | (go << 6) | (ex << 5);
 
    int retval = jtag_data_write(target, instr_with_flags, 8, &dr_out_tmp);
    if (retval != ERROR_OK)
        return retval;
    if (eonce_status)
        *eonce_status = (uint8_t) dr_out_tmp;
    return ERROR_OK;
}
 
/* wrappers for multi opcode instructions */
#define dsp5680xx_exe_1(target, oc1, oc2, oc3)   dsp5680xx_exe1(target, oc1)
#define dsp5680xx_exe_2(target, oc1, oc2, oc3)   dsp5680xx_exe2(target, oc1, oc2)
#define dsp5680xx_exe_3(target, oc1, oc2, oc3)   dsp5680xx_exe3(target, oc1, oc2, oc3)
#define dsp5680xx_exe_generic(t, words, oc1, oc2, oc3) dsp5680xx_exe_##words(t, oc1, oc2, oc3)
 
/* Executes one word DSP instruction */
static int dsp5680xx_exe1(struct target *target, uint16_t opcode)
{
    int retval = eonce_instruction_exec_single(target, 0x04, 0, 1, 0, NULL);
    if (retval != ERROR_OK)
        return retval;
    return jtag_data_write16(target, opcode, NULL);
}
 
/* Executes two word DSP instruction */
static int dsp5680xx_exe2(struct target *target, uint16_t opcode1,
              uint16_t opcode2)
{
    int retval = eonce_instruction_exec_single(target, 0x04, 0, 0, 0, NULL);
    if (retval != ERROR_OK)
        return retval;
    retval = jtag_data_write16(target, opcode1, NULL);
    if (retval != ERROR_OK)
        return retval;
    retval = eonce_instruction_exec_single(target, 0x04, 0, 1, 0, NULL);
    if (retval != ERROR_OK)
        return retval;
    return jtag_data_write16(target, opcode2, NULL);
}
 
/* Executes three word DSP instruction */
static int dsp5680xx_exe3(struct target *target, uint16_t opcode1,
              uint16_t opcode2, uint16_t opcode3)
{
    int retval = eonce_instruction_exec_single(target, 0x04, 0, 0, 0, NULL);
    if (retval != ERROR_OK)
        return retval;
    retval = jtag_data_write16(target, opcode1, NULL);
    if (retval != ERROR_OK)
        return retval;
    retval = eonce_instruction_exec_single(target, 0x04, 0, 0, 0, NULL);
    if (retval != ERROR_OK)
        return retval;
    retval = jtag_data_write16(target, opcode2, NULL);
    if (retval != ERROR_OK)
        return retval;
    retval = eonce_instruction_exec_single(target, 0x04, 0, 1, 0, NULL);
    if (retval != ERROR_OK)
        return retval;
    return jtag_data_write16(target, opcode3, NULL);
}
 
/*
 *--------------- Real-time data exchange ---------------
 * The EOnCE Transmit (OTX) and Receive (ORX) registers are data memory mapped, each with an upper
 * and lower 16 bit word.
 * Transmit and receive directions are defined from the core’s perspective.
 * The core writes to the Transmit register and reads the Receive register, and the host through
 * JTAG writes to the Receive register and reads the Transmit register.
 * Both registers have a combined data memory mapped OTXRXSR which provides indication when
 * each may be accessed.
 * ref: eonce_rev.1.0_0208081.pdf@36
 */
 
/* writes data into upper ORx register of the target */
static int core_tx_upper_data(struct target *target, uint16_t data,
                  uint32_t *eonce_status_low)
{
    int retval =
        eonce_instruction_exec_single(target, DSP5680XX_ONCE_ORX1, 0, 0, 0,
                          NULL);
    if (retval != ERROR_OK)
        return retval;
    return jtag_data_write16(target, data, eonce_status_low);
}
 
/* writes data into lower ORx register of the target */
#define CMD1 eonce_instruction_exec_single(target, DSP5680XX_ONCE_ORX, 0, 0, 0, NULL);
#define CMD2 jtag_data_write16((t, data)
#define core_tx_lower_data(t, data) PT1\ PT2
 
static int core_rx_upper_data(struct target *target, uint8_t *data_read)
{
    int retval =
        eonce_instruction_exec_single(target, DSP5680XX_ONCE_OTX1, 1, 0, 0,
                          NULL);
    if (retval != ERROR_OK)
        return retval;
    return jtag_data_read16(target, data_read);
}
 
static int core_rx_lower_data(struct target *target, uint8_t *data_read)
{
    int retval =
        eonce_instruction_exec_single(target, DSP5680XX_ONCE_OTX, 1, 0, 0,
                          NULL);
    if (retval != ERROR_OK)
        return retval;
    return jtag_data_read16(target, data_read);
}
 
/*
 *-- -- -- -- --- -- -- -- --- -- -- -- --- -- -- -- --- -- -- -- --- --
 *-- -- -- -- --- -- -- -Core Instructions- -- -- -- --- -- -- -- --- --
 *-- -- -- -- --- -- -- -- --- -- -- -- --- -- -- -- --- -- -- -- --- --
 */
 
#define exe(a, b, c, d, e) dsp5680xx_exe_generic(a, b, c, d, e)
 
/* move.l #value, r0 */
#define core_move_long_to_r0(target, value) exe(target, 3, 0xe418, value&0xffff, value>>16)
 
/* move.l #value, n */
#define core_move_long_to_n(target, value)  exe(target, 3, 0xe41e, value&0xffff, value>>16)
 
/* move x:(r0), y0 */
#define core_move_at_r0_to_y0(target)   exe(target, 1, 0xF514, 0, 0)
 
/* move x:(r0), y1 */
#define core_move_at_r0_to_y1(target)   exe(target, 1, 0xF714, 0, 0)
 
/* move.l x:(r0), y */
#define core_move_long_at_r0_y(target) exe(target, 1, 0xF734, 0, 0)
 
/* move y0, x:(r0) */
#define core_move_y0_at_r0(target)  exe(target, 1, 0xd514, 0, 0)
 
/* bfclr #value, x:(r0) */
#define eonce_bfclr_at_r0(target, value)    exe(target, 2, 0x8040, value, 0)
 
/* move #value, y0 */
#define core_move_value_to_y0(target, value)    exe(target, 2, 0x8745, value, 0)
 
/* move.w y0, x:(r0)+ */
#define core_move_y0_at_r0_inc(target)  exe(target, 1, 0xd500, 0, 0)
 
/* move.w y0, p:(r0)+ */
#define core_move_y0_at_pr0_inc(target) exe(target, 1, 0x8560, 0, 0)
 
/* move.w p:(r0)+, y0 */
#define core_move_at_pr0_inc_to_y0(target)  exe(target, 1, 0x8568, 0, 0)
 
/* move.w p:(r0)+, y1 */
#define core_move_at_pr0_inc_to_y1(target)  exe(target, 1, 0x8768, 0, 0)
 
/* move.l #value, r2 */
#define core_move_long_to_r2(target, value) exe(target, 3, 0xe41A, value&0xffff, value>>16)
 
/* move y0, x:(r2) */
#define core_move_y0_at_r2(target)       exe(target, 1, 0xd516, 0, 0)
 
/* move.w #<value>, x:(r2) */
#define core_move_value_at_r2(target, value)    exe(target, 2, 0x8642, value, 0)
 
/* move.w #<value>, x:(r0) */
#define core_move_value_at_r0(target, value)    exe(target, 2, 0x8640, value, 0)
 
/* move.w #<value>, x:(R2+<disp>) */
#define core_move_value_at_r2_disp(target, value, disp) exe(target, 3, 0x8646, value, disp)
 
/* move.w x:(r2), Y0 */
#define core_move_at_r2_to_y0(target)   exe(target, 1, 0xF516, 0, 0)
 
/* move.w p:(r2)+, y0 */
#define core_move_at_pr2_inc_to_y0(target)  exe(target, 1, 0x856A, 0, 0)
 
/* move.l #value, r3 */
#define core_move_long_to_r1(target, value) exe(target, 3, 0xE419, value&0xffff, value>>16)
 
/* move.l #value, r3 */
#define core_move_long_to_r3(target, value) exe(target, 3, 0xE41B, value&0xffff, value>>16)
 
/* move.w y0, p:(r3)+ */
#define core_move_y0_at_pr3_inc(target) exe(target, 1, 0x8563, 0, 0)
 
/* move.w y0, x:(r3) */
#define core_move_y0_at_r3(target)  exe(target, 1, 0xD503, 0, 0)
 
/* move.l #value, r4 */
#define core_move_long_to_r4(target, value) exe(target, 3, 0xE41C, value&0xffff, value>>16)
 
/* move pc, r4 */
#define core_move_pc_to_r4(target)  exe(target, 1, 0xE716, 0, 0)
 
/* move.l r4, y */
#define core_move_r4_to_y(target)   exe(target, 1, 0xe764, 0, 0)
 
/* move.w p:(r0)+, y0 */
#define core_move_at_pr0_inc_to_y0(target)  exe(target, 1, 0x8568, 0, 0)
 
/* move.w x:(r0)+, y0 */
#define core_move_at_r0_inc_to_y0(target)   exe(target, 1, 0xf500, 0, 0)
 
/* move x:(r0), y0 */
#define core_move_at_r0_y0(target)  exe(target, 1, 0xF514, 0, 0)
 
/* nop */
#define eonce_nop(target)   exe(target, 1, 0xe700, 0, 0)
 
/* move.w x:(R2+<disp>), Y0 */
#define core_move_at_r2_disp_to_y0(target, disp) exe(target, 2, 0xF542, disp, 0)
 
/* move.w y1, x:(r2) */
#define core_move_y1_at_r2(target) exe(target, 1, 0xd716, 0, 0)
 
/* move.w y1, x:(r0) */
#define core_move_y1_at_r0(target) exe(target, 1, 0xd714, 0, 0)
 
/* move.bp y0, x:(r0)+ */
#define core_move_byte_y0_at_r0(target) exe(target, 1, 0xd5a0, 0, 0)
 
/* move.w y1, p:(r0)+ */
#define core_move_y1_at_pr0_inc(target) exe(target, 1, 0x8760, 0, 0)
 
/* move.w y1, x:(r0)+ */
#define core_move_y1_at_r0_inc(target) exe(target, 1, 0xD700, 0, 0)
 
/* move.l #value, y */
#define core_move_long_to_y(target, value) exe(target, 3, 0xe417, value&0xffff, value>>16)
 
static int core_move_value_to_pc(struct target *target, uint32_t value)
{
    if (target->state != TARGET_HALTED) {
        err_log(DSP5680XX_ERROR_TARGET_RUNNING, HALT_MSG);
        return ERROR_FAIL;
    }
    if (!dsp5680xx_context.debug_mode_enabled) {
        err_log(DSP5680XX_ERROR_NOT_IN_DEBUG, DEBUG_MSG);
        return ERROR_FAIL;
    }
 
    return dsp5680xx_exe_generic(target, 3, 0xE71E, value & 0xffff,
                      value >> 16);
}
 
static int eonce_load_tx_rx_to_r0(struct target *target)
{
    return core_move_long_to_r0(target,
                     ((MC568013_EONCE_TX_RX_ADDR) +
                      (MC568013_EONCE_OBASE_ADDR << 16)));
}
 
static int core_load_tx_rx_high_addr_to_r0(struct target *target)
{
    return core_move_long_to_r0(target,
                     ((MC568013_EONCE_TX1_RX1_HIGH_ADDR) +
                      (MC568013_EONCE_OBASE_ADDR << 16)));
}
 
static int dsp5680xx_read_core_reg(struct target *target, uint8_t reg_addr,
                   uint16_t *data_read)
{
    /* TODO implement a general version of this which matches what openocd uses. */
    uint32_t dummy_data_to_shift_into_dr;
 
    int retval = eonce_instruction_exec_single(target, reg_addr, 1, 0, 0, NULL);
    if (retval != ERROR_OK)
        return retval;
    retval =
        dsp5680xx_drscan(target, (uint8_t *) &dummy_data_to_shift_into_dr,
                 (uint8_t *) data_read, 8);
    if (retval != ERROR_OK)
        return retval;
    LOG_DEBUG("Reg. data: 0x%02X.", *data_read);
    return ERROR_OK;
}
 
static int eonce_read_status_reg(struct target *target, uint16_t *data)
{
    return dsp5680xx_read_core_reg(target, DSP5680XX_ONCE_OSR, data);
}
 
static int eonce_exit_debug_mode(struct target *target, uint8_t *eonce_status)
{
    return eonce_instruction_exec_single(target, 0x1F, 0, 0, 1, eonce_status);
}
 
static int switch_tap(struct target *target, struct jtag_tap *master_tap,
              struct jtag_tap *core_tap)
{
    int retval = ERROR_OK;
 
    uint32_t instr;
 
    uint32_t ir_out;    /* not used, just to make jtag happy. */
 
    if (!master_tap) {
        master_tap = jtag_tap_by_string("dsp568013.chp");
        if (!master_tap) {
            const char *msg = "Failed to get master tap.";
 
            err_log(DSP5680XX_ERROR_JTAG_TAP_FIND_MASTER, msg);
            return ERROR_FAIL;
        }
    }
    if (!core_tap) {
        core_tap = jtag_tap_by_string("dsp568013.cpu");
        if (!core_tap) {
            err_log(DSP5680XX_ERROR_JTAG_TAP_FIND_CORE,
                  "Failed to get core tap.");
            return ERROR_FAIL;
        }
    }
 
    if (!(((int)master_tap->enabled) ^ ((int)core_tap->enabled))) {
        LOG_WARNING
            ("Master:%d\nCore:%d\nOnly 1 should be enabled.\n",
             (int)master_tap->enabled, (int)core_tap->enabled);
    }
 
    if (master_tap->enabled) {
        instr = 0x5;
        retval =
            dsp5680xx_irscan(target, &instr, &ir_out,
                     DSP5680XX_JTAG_MASTER_TAP_IRLEN);
        if (retval != ERROR_OK)
            return retval;
        instr = 0x2;
        retval =
            dsp5680xx_drscan(target, (uint8_t *) &instr,
                     (uint8_t *) &ir_out, 4);
        if (retval != ERROR_OK)
            return retval;
        core_tap->enabled = true;
        master_tap->enabled = false;
    } else {
        instr = 0x08;
        retval =
            dsp5680xx_irscan(target, &instr, &ir_out,
                     DSP5680XX_JTAG_CORE_TAP_IRLEN);
        if (retval != ERROR_OK)
            return retval;
        instr = 0x1;
        retval =
            dsp5680xx_drscan(target, (uint8_t *) &instr,
                     (uint8_t *) &ir_out, 4);
        if (retval != ERROR_OK)
            return retval;
        core_tap->enabled = false;
        master_tap->enabled = true;
    }
    return ERROR_OK;
}
 
static int eonce_enter_debug_mode_without_reset(struct target *target,
                        uint16_t *eonce_status)
{
    uint32_t instr = JTAG_INSTR_DEBUG_REQUEST;
 
    uint32_t ir_out;    /* not used, just to make jtag happy.*/
 
    /* Debug request #1 */
    int retval =
        dsp5680xx_irscan(target, &instr, &ir_out,
                 DSP5680XX_JTAG_CORE_TAP_IRLEN);
    if (retval != ERROR_OK)
        return retval;
 
    /* Enable EOnCE module */
    instr = JTAG_INSTR_ENABLE_ONCE;
    /* Two rounds of jtag 0x6  (enable eonce) to enable EOnCE. */
    retval =
        dsp5680xx_irscan(target, &instr, &ir_out,
                 DSP5680XX_JTAG_CORE_TAP_IRLEN);
    if (retval != ERROR_OK)
        return retval;
    retval =
        dsp5680xx_irscan(target, &instr, &ir_out,
                 DSP5680XX_JTAG_CORE_TAP_IRLEN);
    if (retval != ERROR_OK)
        return retval;
    if ((ir_out & JTAG_STATUS_MASK) == JTAG_STATUS_DEBUG)
        target->state = TARGET_HALTED;
    else {
        return ERROR_FAIL;
    }
    /* Verify that debug mode is enabled */
    uint16_t data_read_from_dr;
 
    retval = eonce_read_status_reg(target, &data_read_from_dr);
    if (retval != ERROR_OK)
        return retval;
    if ((data_read_from_dr & 0x30) == 0x30) {
        LOG_DEBUG("EOnCE successfully entered debug mode.");
        dsp5680xx_context.debug_mode_enabled = true;
    } else {
        dsp5680xx_context.debug_mode_enabled = false;
        return ERROR_TARGET_FAILURE;
    }
    if (eonce_status)
        *eonce_status = data_read_from_dr;
    return ERROR_OK;
}
 
static int eonce_enter_debug_mode(struct target *target,
                  uint16_t *eonce_status)
{
    uint32_t instr = JTAG_INSTR_DEBUG_REQUEST;
 
    uint32_t ir_out;    /* not used, just to make jtag happy. */
 
    uint16_t instr_16;
 
    uint16_t read_16;
 
    /* First try the easy way */
    int retval = eonce_enter_debug_mode_without_reset(target, eonce_status);
    if (retval == ERROR_OK)
        return retval;
 
    struct jtag_tap *tap_chp = jtag_tap_by_string("dsp568013.chp");
    if (!tap_chp) {
        err_log(DSP5680XX_ERROR_JTAG_TAP_FIND_MASTER,
              "Failed to get master tap.");
        return ERROR_FAIL;
    }
    struct jtag_tap *tap_cpu = jtag_tap_by_string("dsp568013.cpu");
    if (!tap_cpu) {
        err_log(DSP5680XX_ERROR_JTAG_TAP_FIND_CORE,
              "Failed to get master tap.");
        return ERROR_FAIL;
    }
    /* Enable master tap */
    tap_chp->enabled = true;
    tap_cpu->enabled = false;
 
    instr = MASTER_TAP_CMD_IDCODE;
    retval =
        dsp5680xx_irscan(target, &instr, &ir_out,
                 DSP5680XX_JTAG_MASTER_TAP_IRLEN);
    if (retval != ERROR_OK)
        return retval;
    jtag_add_sleep(TIME_DIV_FREESCALE * 100 * 1000);
 
    /* Enable EOnCE module */
    jtag_add_reset(0, 1);
    jtag_add_sleep(TIME_DIV_FREESCALE * 200 * 1000);
    instr = 0x0606ffff;     /* This was selected experimentally. */
    retval =
        dsp5680xx_drscan(target, (uint8_t *) &instr, (uint8_t *) &ir_out,
                 32);
    if (retval != ERROR_OK)
        return retval;
    /* ir_out now hold tap idcode */
 
    /* Enable core tap */
    tap_chp->enabled = true;
    retval = switch_tap(target, tap_chp, tap_cpu);
    if (retval != ERROR_OK)
        return retval;
 
    instr = JTAG_INSTR_ENABLE_ONCE;
    /* Two rounds of jtag 0x6  (enable eonce) to enable EOnCE. */
    retval =
        dsp5680xx_irscan(target, &instr, &ir_out,
                 DSP5680XX_JTAG_CORE_TAP_IRLEN);
    if (retval != ERROR_OK)
        return retval;
    instr = JTAG_INSTR_DEBUG_REQUEST;
    retval =
        dsp5680xx_irscan(target, &instr, &ir_out,
                 DSP5680XX_JTAG_CORE_TAP_IRLEN);
    if (retval != ERROR_OK)
        return retval;
    instr_16 = 0x1;
    retval =
        dsp5680xx_drscan(target, (uint8_t *) &instr_16,
                 (uint8_t *) &read_16, 8);
    if (retval != ERROR_OK)
        return retval;
    instr_16 = 0x20;
    retval =
        dsp5680xx_drscan(target, (uint8_t *) &instr_16,
                 (uint8_t *) &read_16, 8);
    if (retval != ERROR_OK)
        return retval;
    jtag_add_sleep(TIME_DIV_FREESCALE * 100 * 1000);
    jtag_add_reset(0, 0);
    jtag_add_sleep(TIME_DIV_FREESCALE * 300 * 1000);
 
    instr = JTAG_INSTR_ENABLE_ONCE;
    /* Two rounds of jtag 0x6  (enable eonce) to enable EOnCE. */
    for (int i = 0; i < 3; i++) {
        retval =
            dsp5680xx_irscan(target, &instr, &ir_out,
                     DSP5680XX_JTAG_CORE_TAP_IRLEN);
        if (retval != ERROR_OK)
            return retval;
    }
    if ((ir_out & JTAG_STATUS_MASK) == JTAG_STATUS_DEBUG)
        target->state = TARGET_HALTED;
    else {
        err_log(DSP5680XX_ERROR_HALT, "Failed to halt target.");
        return ERROR_FAIL;
    }
 
    for (int i = 0; i < 3; i++) {
        instr_16 = 0x86;
        dsp5680xx_drscan(target, (uint8_t *) &instr_16,
                 (uint8_t *) &read_16, 16);
        instr_16 = 0xff;
        dsp5680xx_drscan(target, (uint8_t *) &instr_16,
                 (uint8_t *) &read_16, 16);
    }
 
    /* Verify that debug mode is enabled */
    uint16_t data_read_from_dr;
 
    retval = eonce_read_status_reg(target, &data_read_from_dr);
    if (retval != ERROR_OK)
        return retval;
    if ((data_read_from_dr & 0x30) == 0x30) {
        LOG_DEBUG("EOnCE successfully entered debug mode.");
        dsp5680xx_context.debug_mode_enabled = true;
    } else {
        const char *msg = "Failed to set EOnCE module to debug mode";
 
        err_log(DSP5680XX_ERROR_ENTER_DEBUG_MODE, msg);
        return ERROR_TARGET_FAILURE;
    }
    if (eonce_status)
        *eonce_status = data_read_from_dr;
    return ERROR_OK;
}
 
static int eonce_pc_store(struct target *target)
{
    uint8_t tmp[2];
 
    int retval = core_move_pc_to_r4(target);
    if (retval != ERROR_OK)
        return retval;
    retval = core_move_r4_to_y(target);
    if (retval != ERROR_OK)
        return retval;
    retval = eonce_load_tx_rx_to_r0(target);
    if (retval != ERROR_OK)
        return retval;
    retval = core_move_y0_at_r0(target);
    if (retval != ERROR_OK)
        return retval;
    retval = core_rx_lower_data(target, tmp);
    if (retval != ERROR_OK)
        return retval;
    LOG_USER("PC value: 0x%X%X\n", tmp[1], tmp[0]);
    dsp5680xx_context.stored_pc = (tmp[0] | (tmp[1] << 8));
    return ERROR_OK;
}
 
static int dsp5680xx_target_create(struct target *target)
{
    struct dsp5680xx_common *dsp5680xx =
        calloc(1, sizeof(struct dsp5680xx_common));
    target->arch_info = dsp5680xx;
    return ERROR_OK;
}
 
static int dsp5680xx_init_target(struct command_context *cmd_ctx,
                 struct target *target)
{
    dsp5680xx_context.stored_pc = 0;
    dsp5680xx_context.flush = 1;
    dsp5680xx_context.debug_mode_enabled = false;
    LOG_DEBUG("target initiated!");
    /* TODO core tap must be enabled before running these commands, currently
     * this is done in the .cfg tcl script. */
    return ERROR_OK;
}
 
static int dsp5680xx_arch_state(struct target *target)
{
    LOG_USER("%s not implemented yet.", __func__);
    return ERROR_OK;
}
 
static int dsp5680xx_assert_reset(struct target *target)
{
    target->state = TARGET_RESET;
    return ERROR_OK;
}
 
static int dsp5680xx_deassert_reset(struct target *target)
{
    target->state = TARGET_RUNNING;
    return ERROR_OK;
}
 
static int dsp5680xx_halt(struct target *target)
{
    uint16_t eonce_status = 0xbeef;
 
    if ((target->state == TARGET_HALTED)
        && (dsp5680xx_context.debug_mode_enabled)) {
        LOG_USER("Target already halted and in debug mode.");
        return ERROR_OK;
    } else {
        if (target->state == TARGET_HALTED)
            LOG_USER
                ("Target already halted, re attempting to enter debug mode.");
    }
    int retval = eonce_enter_debug_mode(target, &eonce_status);
    if (retval != ERROR_OK)
        return retval;
    retval = eonce_pc_store(target);
    if (retval != ERROR_OK)
        return retval;
    if (dsp5680xx_context.debug_mode_enabled) {
        retval = eonce_pc_store(target);
    }
    return retval;
}
 
static int dsp5680xx_poll(struct target *target)
{
    uint8_t jtag_status;
 
    uint8_t eonce_status;
 
    uint16_t read_tmp;
 
    int retval = dsp5680xx_jtag_status(target, &jtag_status);
    if (retval != ERROR_OK)
        return retval;
    if (jtag_status == JTAG_STATUS_DEBUG)
        if (target->state != TARGET_HALTED) {
            retval = eonce_enter_debug_mode(target, &read_tmp);
            if (retval != ERROR_OK)
                return retval;
            eonce_status = (uint8_t) read_tmp;
            if ((eonce_status & EONCE_STAT_MASK) !=
                DSP5680XX_ONCE_OSCR_DEBUG_M) {
                const char *msg =
                    "%s: Failed to put EOnCE in debug mode.Flash locked?...";
                LOG_WARNING(msg, __func__);
                return ERROR_TARGET_FAILURE;
            } else {
                target->state = TARGET_HALTED;
                return ERROR_OK;
            }
        }
    if (jtag_status == JTAG_STATUS_NORMAL) {
        if (target->state == TARGET_RESET) {
            retval = dsp5680xx_halt(target);
            if (retval != ERROR_OK)
                return retval;
            retval = eonce_exit_debug_mode(target, &eonce_status);
            if (retval != ERROR_OK)
                return retval;
            if ((eonce_status & EONCE_STAT_MASK) !=
                DSP5680XX_ONCE_OSCR_NORMAL_M) {
                const char *msg =
                    "%s: JTAG running, but EOnCE run failed.Try resetting..";
                LOG_WARNING(msg, __func__);
                return ERROR_TARGET_FAILURE;
            } else {
                target->state = TARGET_RUNNING;
                return ERROR_OK;
            }
        }
        if (target->state != TARGET_RUNNING) {
            retval = eonce_read_status_reg(target, &read_tmp);
            if (retval != ERROR_OK)
                return retval;
            eonce_status = (uint8_t) read_tmp;
            if ((eonce_status & EONCE_STAT_MASK) !=
                DSP5680XX_ONCE_OSCR_NORMAL_M) {
                LOG_WARNING
                    ("Inconsistent target status. Restart!");
                return ERROR_TARGET_FAILURE;
            }
        }
        target->state = TARGET_RUNNING;
        return ERROR_OK;
    }
    if (jtag_status == JTAG_STATUS_DEAD) {
        LOG_ERROR
            ("%s: Cannot communicate with JTAG. Check connection...",
             __func__);
        target->state = TARGET_UNKNOWN;
        return ERROR_TARGET_FAILURE;
    }
    if (target->state == TARGET_UNKNOWN) {
        LOG_ERROR("%s: Target status invalid - communication failure",
              __func__);
        return ERROR_TARGET_FAILURE;
    }
    return ERROR_OK;
}
 
static int dsp5680xx_resume(struct target *target, bool current,
        target_addr_t address, bool handle_breakpoints, bool debug_execution)
{
    if (target->state == TARGET_RUNNING) {
        LOG_USER("Target already running.");
        return ERROR_OK;
    }
    int retval;
 
    uint8_t eonce_status;
 
    uint8_t jtag_status;
 
    if (dsp5680xx_context.debug_mode_enabled) {
        if (!current) {
            retval = core_move_value_to_pc(target, address);
            if (retval != ERROR_OK)
                return retval;
        }
 
        int retry = 20;
 
        while (retry-- > 1) {
            retval = eonce_exit_debug_mode(target, &eonce_status);
            if (retval != ERROR_OK)
                return retval;
            if (eonce_status == DSP5680XX_ONCE_OSCR_NORMAL_M)
                break;
        }
        if (retry == 0) {
            err_log(DSP5680XX_ERROR_EXIT_DEBUG_MODE,
                  "Failed to exit debug mode...");
            return ERROR_TARGET_FAILURE;
        } else {
            target->state = TARGET_RUNNING;
            dsp5680xx_context.debug_mode_enabled = false;
        }
        LOG_DEBUG("EOnCE status: 0x%02X.", eonce_status);
    } else {
        /*
         * If debug mode was not enabled but target was halted, then it is most likely that
         * access to eonce registers is locked.
         * Reset target to make it run again.
         */
        jtag_add_reset(0, 1);
        jtag_add_sleep(TIME_DIV_FREESCALE * 200 * 1000);
 
        retval = reset_jtag();
        if (retval != ERROR_OK) {
            err_log(DSP5680XX_ERROR_JTAG_RESET,
                  "Failed to reset JTAG state machine");
            return retval;
        }
        jtag_add_sleep(TIME_DIV_FREESCALE * 100 * 1000);
        jtag_add_reset(0, 0);
        jtag_add_sleep(TIME_DIV_FREESCALE * 300 * 1000);
        retval = dsp5680xx_jtag_status(target, &jtag_status);
        if (retval != ERROR_OK)
            return retval;
        if ((jtag_status & JTAG_STATUS_MASK) == JTAG_STATUS_NORMAL) {
            target->state = TARGET_RUNNING;
            dsp5680xx_context.debug_mode_enabled = false;
        } else {
            err_log(DSP5680XX_ERROR_RESUME, "Failed to resume target");
            return ERROR_TARGET_FAILURE;
        }
    }
    return ERROR_OK;
}
 
static int dsp5680xx_convert_address(uint32_t *address, int *pmem)
{
    /*
     * Distinguish data memory (x) from program memory (p) by the address.
     * Addresses over S_FILE_DATA_OFFSET are considered (x) memory.
     */
    if (*address >= S_FILE_DATA_OFFSET) {
        *pmem = 0;
        if (((*address) & 0xff0000) != 0xff0000)
            *address -= S_FILE_DATA_OFFSET;
    }
    return ERROR_OK;
}
 
static int dsp5680xx_read_16_single(struct target *t, uint32_t a,
                    uint8_t *data_read, int r_pmem)
{
    struct target *target = t;
 
    uint32_t address = a;
 
    int retval = core_move_long_to_r0(target, address);
    if (retval != ERROR_OK)
        return retval;
    if (r_pmem)
        retval = core_move_at_pr0_inc_to_y0(target);
    else
        retval = core_move_at_r0_to_y0(target);
    if (retval != ERROR_OK)
        return retval;
    retval = eonce_load_tx_rx_to_r0(target);
    if (retval != ERROR_OK)
        return retval;
    retval = core_move_y0_at_r0(target);
    if (retval != ERROR_OK)
        return retval;
    /* at this point the data i want is at the reg eonce can read */
    retval = core_rx_lower_data(target, data_read);
    if (retval != ERROR_OK)
        return retval;
    LOG_DEBUG("%s:Data read from 0x%06" PRIX32 ": 0x%02X%02X", __func__, address,
          data_read[1], data_read[0]);
    return ERROR_OK;
}
 
static int dsp5680xx_read_32_single(struct target *t, uint32_t a,
                    uint8_t *data_read, int r_pmem)
{
    struct target *target = t;
 
    uint32_t address = a;
 
    address = (address & 0xFFFFF);
    /* Get data to an intermediate register */
    int retval = core_move_long_to_r0(target, address);
    if (retval != ERROR_OK)
        return retval;
    if (r_pmem) {
        retval = core_move_at_pr0_inc_to_y0(target);
        if (retval != ERROR_OK)
            return retval;
        retval = core_move_at_pr0_inc_to_y1(target);
        if (retval != ERROR_OK)
            return retval;
    } else {
        retval = core_move_at_r0_inc_to_y0(target);
        if (retval != ERROR_OK)
            return retval;
        retval = core_move_at_r0_to_y1(target);
        if (retval != ERROR_OK)
            return retval;
    }
    /* Get lower part of data to TX/RX */
    retval = eonce_load_tx_rx_to_r0(target);
    if (retval != ERROR_OK)
        return retval;
    retval = core_move_y0_at_r0_inc(target);    /* This also load TX/RX high to r0 */
    if (retval != ERROR_OK)
        return retval;
    /* Get upper part of data to TX/RX */
    retval = core_move_y1_at_r0(target);
    if (retval != ERROR_OK)
        return retval;
    /* at this point the data i want is at the reg eonce can read */
    retval = core_rx_lower_data(target, data_read);
    if (retval != ERROR_OK)
        return retval;
    return core_rx_upper_data(target, data_read + 2);
}
 
static int dsp5680xx_read(struct target *t, target_addr_t a, uint32_t size,
              uint32_t count, uint8_t *buf)
{
    struct target *target = t;
 
    uint32_t address = a;
 
    uint8_t *buffer = buf;
 
    if (target->state != TARGET_HALTED) {
        err_log(DSP5680XX_ERROR_TARGET_RUNNING, HALT_MSG);
        return ERROR_FAIL;
    }
    if (!dsp5680xx_context.debug_mode_enabled) {
        err_log(DSP5680XX_ERROR_NOT_IN_DEBUG, DEBUG_MSG);
        return ERROR_FAIL;
    }
 
    int pmem = 1;
 
    int retval = dsp5680xx_convert_address(&address, &pmem);
    if (retval != ERROR_OK)
        return retval;
 
    dsp5680xx_context.flush = 0;
    int counter = FLUSH_COUNT_READ_WRITE;
 
    for (unsigned int i = 0; i < count; i++) {
        if (--counter == 0) {
            dsp5680xx_context.flush = 1;
            counter = FLUSH_COUNT_READ_WRITE;
        }
        switch (size) {
        case 1:
            if (!(i % 2))
                retval =
                    dsp5680xx_read_16_single(target,
                                 address + i / 2,
                                 buffer + i, pmem);
            break;
        case 2:
            retval =
                dsp5680xx_read_16_single(target, address + i,
                             buffer + 2 * i, pmem);
            break;
        case 4:
            retval =
                dsp5680xx_read_32_single(target, address + 2 * i,
                             buffer + 4 * i, pmem);
            break;
        default:
            LOG_USER("%s: Invalid read size.", __func__);
            break;
        }
        if (retval != ERROR_OK)
            return retval;
        dsp5680xx_context.flush = 0;
    }
 
    dsp5680xx_context.flush = 1;
    return dsp5680xx_execute_queue();
}
 
static int dsp5680xx_write_16_single(struct target *t, uint32_t a,
                     uint16_t data, uint8_t w_pmem)
{
    struct target *target = t;
 
    uint32_t address = a;
 
    int retval = core_move_long_to_r0(target, address);
    if (retval != ERROR_OK)
        return retval;
    if (w_pmem) {
        retval = core_move_value_to_y0(target, data);
        if (retval != ERROR_OK)
            return retval;
        retval = core_move_y0_at_pr0_inc(target);
    } else {
        retval = core_move_value_at_r0(target, data);
    }
    return retval;
}
 
static int dsp5680xx_write_32_single(struct target *t, uint32_t a,
                     uint32_t data, int w_pmem)
{
    struct target *target = t;
 
    uint32_t address = a;
 
    int retval = core_move_long_to_r0(target, address);
    if (retval != ERROR_OK)
        return retval;
    retval = core_move_long_to_y(target, data);
    if (retval != ERROR_OK)
        return retval;
    if (w_pmem)
        retval = core_move_y0_at_pr0_inc(target);
    else
        retval = core_move_y0_at_r0_inc(target);
    if (retval != ERROR_OK)
        return retval;
    if (w_pmem)
        retval = core_move_y1_at_pr0_inc(target);
    else
        retval = core_move_y1_at_r0_inc(target);
    return retval;
}
 
static int dsp5680xx_write_8(struct target *t, uint32_t a, uint32_t c,
                 const uint8_t *d, int pmem)
{
    struct target *target = t;
 
    uint32_t address = a;
 
    uint32_t count = c;
 
    const uint8_t *data = d;
 
    int retval = 0;
 
    uint16_t data_16;
 
    uint32_t iter;
 
    int counter = FLUSH_COUNT_READ_WRITE;
 
    for (iter = 0; iter < count / 2; iter++) {
        if (--counter == 0) {
            dsp5680xx_context.flush = 1;
            counter = FLUSH_COUNT_READ_WRITE;
        }
        data_16 = (data[2 * iter] | (data[2 * iter + 1] << 8));
        retval =
            dsp5680xx_write_16_single(target, address + iter, data_16,
                          pmem);
        if (retval != ERROR_OK) {
            LOG_ERROR("%s: Could not write to p:0x%04" PRIX32, __func__,
                  address);
            dsp5680xx_context.flush = 1;
            return retval;
        }
        dsp5680xx_context.flush = 0;
    }
    dsp5680xx_context.flush = 1;
 
    /* Only one byte left, let's not overwrite the other byte (mem is 16bit) */
    /* Need to retrieve the part we do not want to overwrite. */
    uint16_t data_old;
 
    if ((count == 1) || (count % 2)) {
        retval =
            dsp5680xx_read(target, address + iter, 1, 1,
                       (uint8_t *) &data_old);
        if (retval != ERROR_OK)
            return retval;
        if (count == 1)
            data_old = (((data_old & 0xff) << 8) | data[0]); /* preserve upper byte */
        else
            data_old =
                (((data_old & 0xff) << 8) | data[2 * iter + 1]);
        retval =
            dsp5680xx_write_16_single(target, address + iter, data_old,
                          pmem);
    }
    return retval;
}
 
static int dsp5680xx_write_16(struct target *t, uint32_t a, uint32_t c,
                  const uint8_t *d, int pmem)
{
    struct target *target = t;
 
    uint32_t address = a;
 
    uint32_t count = c;
 
    const uint8_t *data = d;
 
    uint32_t iter;
 
    int counter = FLUSH_COUNT_READ_WRITE;
 
    for (iter = 0; iter < count; iter++) {
        if (--counter == 0) {
            dsp5680xx_context.flush = 1;
            counter = FLUSH_COUNT_READ_WRITE;
        }
        int retval =
            dsp5680xx_write_16_single(target, address + iter,
                          data[iter], pmem);
        if (retval != ERROR_OK) {
            LOG_ERROR("%s: Could not write to p:0x%04" PRIX32, __func__,
                  address);
            dsp5680xx_context.flush = 1;
            return retval;
        }
        dsp5680xx_context.flush = 0;
    }
    dsp5680xx_context.flush = 1;
    return ERROR_OK;
}
 
static int dsp5680xx_write_32(struct target *t, uint32_t a, uint32_t c,
                  const uint8_t *d, int pmem)
{
    struct target *target = t;
 
    uint32_t address = a;
 
    uint32_t count = c;
 
    const uint8_t *data = d;
 
    uint32_t iter;
 
    int counter = FLUSH_COUNT_READ_WRITE;
 
    for (iter = 0; iter < count; iter++) {
        if (--counter == 0) {
            dsp5680xx_context.flush = 1;
            counter = FLUSH_COUNT_READ_WRITE;
        }
        int retval =
            dsp5680xx_write_32_single(target, address + (iter << 1),
                          data[iter], pmem);
        if (retval != ERROR_OK) {
            LOG_ERROR("%s: Could not write to p:0x%04" PRIX32, __func__,
                  address);
            dsp5680xx_context.flush = 1;
            return retval;
        }
        dsp5680xx_context.flush = 0;
    }
    dsp5680xx_context.flush = 1;
    return ERROR_OK;
}
 
static int dsp5680xx_write(struct target *target, target_addr_t a, uint32_t size, uint32_t count,
               const uint8_t *b)
{
    /* TODO Cannot write 32bit to odd address, will write 0x12345678  as 0x5678 0x0012 */
    uint32_t address = a;
 
    uint8_t const *buffer = b;
 
    if (target->state != TARGET_HALTED) {
        err_log(DSP5680XX_ERROR_TARGET_RUNNING, HALT_MSG);
        return ERROR_FAIL;
    }
    if (!dsp5680xx_context.debug_mode_enabled) {
        err_log(DSP5680XX_ERROR_NOT_IN_DEBUG, DEBUG_MSG);
        return ERROR_FAIL;
    }
 
    int p_mem = 1;
 
    int retval = dsp5680xx_convert_address(&address, &p_mem);
    if (retval != ERROR_OK)
        return retval;
 
    switch (size) {
    case 1:
        retval =
            dsp5680xx_write_8(target, address, count, buffer, p_mem);
        break;
    case 2:
        retval =
            dsp5680xx_write_16(target, address, count, buffer, p_mem);
        break;
    case 4:
        retval =
            dsp5680xx_write_32(target, address, count, buffer, p_mem);
        break;
    default:
        err_log(DSP5680XX_ERROR_INVALID_DATA_SIZE_UNIT, "Invalid data size.");
        return ERROR_TARGET_DATA_ABORT;
    }
    return retval;
}
 
static int dsp5680xx_write_buffer(struct target *t, target_addr_t a, uint32_t size,
                  const uint8_t *b)
{
    if (t->state != TARGET_HALTED) {
        err_log(DSP5680XX_ERROR_TARGET_RUNNING, HALT_MSG);
        return ERROR_FAIL;
    }
    if (!dsp5680xx_context.debug_mode_enabled) {
        err_log(DSP5680XX_ERROR_NOT_IN_DEBUG, DEBUG_MSG);
        return ERROR_FAIL;
    }
    return dsp5680xx_write(t, a, 1, size, b);
}
 
static int dsp5680xx_read_buffer(struct target *target, target_addr_t address, uint32_t size,
                 uint8_t *buffer)
{
    if (target->state != TARGET_HALTED) {
        err_log(DSP5680XX_ERROR_TARGET_RUNNING, HALT_MSG);
        return ERROR_FAIL;
    }
    if (!dsp5680xx_context.debug_mode_enabled) {
        err_log(DSP5680XX_ERROR_NOT_IN_DEBUG, DEBUG_MSG);
        return ERROR_FAIL;
    }
 
    /* The "/2" solves the byte/word addressing issue.*/
    return dsp5680xx_read(target, address, 2, size / 2, buffer);
}
 
static int dsp5680xx_checksum_memory(struct target *target, target_addr_t address, uint32_t size,
                     uint32_t *checksum)
{
    return ERROR_FAIL;
}
 
static int perl_crc(const uint8_t *buff8, uint32_t word_count)
{
    uint16_t checksum = 0xffff;
 
    uint16_t data, fbmisr;
 
    uint32_t i;
 
    for (i = 0; i < word_count; i++) {
        data = (buff8[2 * i] | (buff8[2 * i + 1] << 8));
        fbmisr =
            (checksum & 2) >> 1 ^ (checksum & 4) >> 2 ^ (checksum & 16)
                >> 4 ^ (checksum & 0x8000) >> 15;
        checksum = (data ^ ((checksum << 1) | fbmisr));
    }
    i--;
    for (; !(i & 0x80000000); i--) {
        data = (buff8[2 * i] | (buff8[2 * i + 1] << 8));
        fbmisr =
            (checksum & 2) >> 1 ^ (checksum & 4) >> 2 ^ (checksum & 16)
                       >> 4 ^ (checksum & 0x8000) >> 15;
        checksum = (data ^ ((checksum << 1) | fbmisr));
    }
    return checksum;
}
 
static int dsp5680xx_f_sim_reset(struct target *target)
{
    uint16_t sim_cmd = SIM_CMD_RESET;
 
    if (strcmp(target->tap->chip, "dsp568013") == 0) {
        uint32_t sim_addr = MC568013_SIM_BASE_ADDR + S_FILE_DATA_OFFSET;
        return dsp5680xx_write(target, sim_addr, 1, 2,
                    (const uint8_t *)&sim_cmd);
    }
    return ERROR_OK;
}
 
static int dsp5680xx_soft_reset_halt(struct target *target)
{
    /* TODO is this what this function is expected to do...? */
    int retval = dsp5680xx_halt(target);
    if (retval != ERROR_OK)
        return retval;
    return dsp5680xx_f_sim_reset(target);
}
 
int dsp5680xx_f_protect_check(struct target *target, uint16_t *protected)
{
    if (target->state != TARGET_HALTED) {
        err_log(DSP5680XX_ERROR_TARGET_RUNNING, HALT_MSG);
        return ERROR_FAIL;
    }
    if (!dsp5680xx_context.debug_mode_enabled) {
        err_log(DSP5680XX_ERROR_NOT_IN_DEBUG, DEBUG_MSG);
        return ERROR_FAIL;
    }
    if (!protected) {
        const char *msg = "NULL pointer not valid.";
 
        err_log(DSP5680XX_ERROR_PROTECT_CHECK_INVALID_ARGS, msg);
        return ERROR_FAIL;
    }
    return dsp5680xx_read_16_single(target, HFM_BASE_ADDR | HFM_PROT,
                     (uint8_t *) protected, 0);
}
 
static int dsp5680xx_f_ex(struct target *target, uint16_t c, uint32_t address, uint32_t data,
              uint16_t *hfm_ustat, int pmem)
{
    uint32_t command = c;
 
    int retval = core_load_tx_rx_high_addr_to_r0(target);
    if (retval != ERROR_OK)
        return retval;
    retval = core_move_long_to_r2(target, HFM_BASE_ADDR);
    if (retval != ERROR_OK)
        return retval;
    uint8_t i[2];
 
    int watchdog = 100;
 
    do {
        retval = core_move_at_r2_disp_to_y0(target, HFM_USTAT); /* read HMF_USTAT */
        if (retval != ERROR_OK)
            return retval;
        retval = core_move_y0_at_r0(target);
        if (retval != ERROR_OK)
            return retval;
        retval = core_rx_upper_data(target, i);
        if (retval != ERROR_OK)
            return retval;
        if ((watchdog--) == 1) {
            const char *msg =
                "Timed out waiting for FM to finish old command.";
            err_log(DSP5680XX_ERROR_FM_BUSY, msg);
            return ERROR_TARGET_FAILURE;
        }
    } while (!(i[0] & 0x40)); /* wait until current command is complete */
 
    dsp5680xx_context.flush = 0;
 
    /* write to HFM_CNFG (lock=0,select bank) - flash_desc.bank&0x03, 0x01 == 0x00, 0x01 ??? */
    retval = core_move_value_at_r2_disp(target, 0x00, HFM_CNFG);
    if (retval != ERROR_OK)
        return retval;
    /* write to HMF_USTAT, clear PVIOL, ACCERR &BLANK bits */
    retval = core_move_value_at_r2_disp(target, 0x04, HFM_USTAT);
    if (retval != ERROR_OK)
        return retval;
    /* clear only one bit at a time */
    retval = core_move_value_at_r2_disp(target, 0x10, HFM_USTAT);
    if (retval != ERROR_OK)
        return retval;
    retval = core_move_value_at_r2_disp(target, 0x20, HFM_USTAT);
    if (retval != ERROR_OK)
        return retval;
    /* write to HMF_PROT, clear protection */
    retval = core_move_value_at_r2_disp(target, 0x00, HFM_PROT);
    if (retval != ERROR_OK)
        return retval;
    /* write to HMF_PROTB, clear protection */
    retval = core_move_value_at_r2_disp(target, 0x00, HFM_PROTB);
    if (retval != ERROR_OK)
        return retval;
    retval = core_move_value_to_y0(target, data);
    if (retval != ERROR_OK)
        return retval;
    /* write to the flash block */
    retval = core_move_long_to_r3(target, address);
    if (retval != ERROR_OK)
        return retval;
    if (pmem) {
        retval = core_move_y0_at_pr3_inc(target);
    } else {
        retval = core_move_y0_at_r3(target);
    }
    if (retval != ERROR_OK)
        return retval;
    /* write command to the HFM_CMD reg */
    retval = core_move_value_at_r2_disp(target, command, HFM_CMD);
    if (retval != ERROR_OK)
        return retval;
    /* start the command */
    retval = core_move_value_at_r2_disp(target, 0x80, HFM_USTAT);
    if (retval != ERROR_OK)
        return retval;
 
    dsp5680xx_context.flush = 1;
    retval = dsp5680xx_execute_queue();
    if (retval != ERROR_OK)
        return retval;
 
    watchdog = 100;
    do {
        /* read HMF_USTAT */
        retval = core_move_at_r2_disp_to_y0(target, HFM_USTAT);
        if (retval != ERROR_OK)
            return retval;
        retval = core_move_y0_at_r0(target);
        if (retval != ERROR_OK)
            return retval;
        retval = core_rx_upper_data(target, i);
        if (retval != ERROR_OK)
            return retval;
        if ((watchdog--) == 1) {
            err_log(DSP5680XX_ERROR_FM_CMD_TIMED_OUT,
                  "FM execution did not finish.");
            return ERROR_TARGET_FAILURE;
        }
    } while (!(i[0] & 0x40)); /* wait until the command is complete */
    *hfm_ustat = ((i[0] << 8) | (i[1]));
    if (i[0] & HFM_USTAT_MASK_PVIOL_ACCER) {
        const char *msg =
            "pviol and/or accer bits set. HFM command execution error";
        err_log(DSP5680XX_ERROR_FM_EXEC, msg);
        return ERROR_TARGET_FAILURE;
    }
    return ERROR_OK;
}
 
static int set_fm_ck_div(struct target *target)
{
    uint8_t i[2];
 
    int retval = core_move_long_to_r2(target, HFM_BASE_ADDR);
    if (retval != ERROR_OK)
        return retval;
    retval = core_load_tx_rx_high_addr_to_r0(target);
    if (retval != ERROR_OK)
        return retval;
    /* read HFM_CLKD */
    retval = core_move_at_r2_to_y0(target);
    if (retval != ERROR_OK)
        return retval;
    retval = core_move_y0_at_r0(target);
    if (retval != ERROR_OK)
        return retval;
    retval = core_rx_upper_data(target, i);
    if (retval != ERROR_OK)
        return retval;
    unsigned int hfm_at_wrong_value = 0;
 
    if ((i[0] & 0x7f) != HFM_CLK_DEFAULT) {
        LOG_DEBUG("HFM CLK divisor contained incorrect value (0x%02X).",
              i[0] & 0x7f);
        hfm_at_wrong_value = 1;
    } else {
        LOG_DEBUG
            ("HFM CLK divisor was already set to correct value (0x%02X).",
             i[0] & 0x7f);
        return ERROR_OK;
    }
    /* write HFM_CLKD */
    retval = core_move_value_at_r2(target, HFM_CLK_DEFAULT);
    if (retval != ERROR_OK)
        return retval;
    /* verify HFM_CLKD */
    retval = core_move_at_r2_to_y0(target);
    if (retval != ERROR_OK)
        return retval;
    retval = core_move_y0_at_r0(target);
    if (retval != ERROR_OK)
        return retval;
    retval = core_rx_upper_data(target, i);
    if (retval != ERROR_OK)
        return retval;
    if (i[0] != (0x80 | (HFM_CLK_DEFAULT & 0x7f))) {
        err_log(DSP5680XX_ERROR_FM_SET_CLK, "Unable to set HFM CLK divisor.");
        return ERROR_TARGET_FAILURE;
    }
    if (hfm_at_wrong_value)
        LOG_DEBUG("HFM CLK divisor set to 0x%02x.", i[0] & 0x7f);
    return ERROR_OK;
}
 
static int dsp5680xx_f_signature(struct target *target, uint32_t address, uint32_t words,
                 uint16_t *signature)
{
    int retval;
 
    uint16_t hfm_ustat;
 
    if (!dsp5680xx_context.debug_mode_enabled) {
        retval = eonce_enter_debug_mode_without_reset(target, NULL);
        /*
         * Generate error here, since it is not done in eonce_enter_debug_mode_without_reset
         */
        if (retval != ERROR_OK) {
            err_log(DSP5680XX_ERROR_HALT, "Failed to halt target.");
            return retval;
        }
    }
    retval =
        dsp5680xx_f_ex(target, HFM_CALCULATE_DATA_SIGNATURE, address, words,
                   &hfm_ustat, 1);
    if (retval != ERROR_OK)
        return retval;
    return dsp5680xx_read_16_single(target, HFM_BASE_ADDR | HFM_DATA,
                     (uint8_t *) signature, 0);
}
 
int dsp5680xx_f_erase_check(struct target *target, uint8_t *erased,
                uint32_t sector)
{
    int retval;
 
    uint16_t hfm_ustat;
 
    uint32_t tmp;
 
    if (!dsp5680xx_context.debug_mode_enabled) {
        retval = dsp5680xx_halt(target);
        if (retval != ERROR_OK)
            return retval;
    }
    retval = set_fm_ck_div(target);
    if (retval != ERROR_OK)
        return retval;
    /*
     * Check if chip is already erased.
     */
    tmp = HFM_FLASH_BASE_ADDR + sector * HFM_SECTOR_SIZE / 2;
    retval =
        dsp5680xx_f_ex(target, HFM_ERASE_VERIFY, tmp, 0, &hfm_ustat, 1);
    if (retval != ERROR_OK)
        return retval;
    if (erased)
        *erased = (uint8_t) (hfm_ustat & HFM_USTAT_MASK_BLANK);
    return ERROR_OK;
}
 
static int erase_sector(struct target *target, int sector, uint16_t *hfm_ustat)
{
    uint32_t tmp = HFM_FLASH_BASE_ADDR + sector * HFM_SECTOR_SIZE / 2;
 
    return dsp5680xx_f_ex(target, HFM_PAGE_ERASE, tmp, 0, hfm_ustat, 1);
}
 
static int mass_erase(struct target *target, uint16_t *hfm_ustat)
{
    return dsp5680xx_f_ex(target, HFM_MASS_ERASE, 0, 0, hfm_ustat, 1);
}
 
int dsp5680xx_f_erase(struct target *target, int first, int last)
{
    int retval;
 
    if (!dsp5680xx_context.debug_mode_enabled) {
        retval = dsp5680xx_halt(target);
        if (retval != ERROR_OK)
            return retval;
    }
    /*
     * Reset SIM
     *
     */
    retval = dsp5680xx_f_sim_reset(target);
    if (retval != ERROR_OK)
        return retval;
    /*
     * Set hfmdiv
     *
     */
    retval = set_fm_ck_div(target);
    if (retval != ERROR_OK)
        return retval;
 
    uint16_t hfm_ustat;
 
    int do_mass_erase = ((!(first | last))
                 || ((first == 0)
                 && (last == (HFM_SECTOR_COUNT - 1))));
    if (do_mass_erase) {
        /* Mass erase */
        retval = mass_erase(target, &hfm_ustat);
        if (retval != ERROR_OK)
            return retval;
    } else {
        for (int i = first; i <= last; i++) {
            retval = erase_sector(target, i, &hfm_ustat);
            if (retval != ERROR_OK)
                return retval;
        }
    }
    return ERROR_OK;
}
 
/*
 * Algorithm for programming normal p: flash
 * Follow state machine from "56F801x Peripheral Reference Manual"@163.
 * Registers to set up before calling:
 * r0: TX/RX high address.
 * r2: FM module base address.
 * r3: Destination address in flash.
 *
 *      hfm_wait:                      // wait for buffer empty
 *          brclr   #0x80, x:(r2+0x13), hfm_wait
 *      rx_check:                       // wait for input buffer full
 *          brclr   #0x01, x:(r0-2), rx_check
 *          move.w  x:(r0), y0              // read from Rx buffer
 *          move.w  y0, p:(r3)+
 *          move.w  #0x20, x:(r2+0x14)          // write PGM command
 *          move.w  #0x80, x:(r2+0x13)          // start the command
 *          move.w  X:(R2+0x13), A              // Read USTAT register
 *            brclr       #0x20, A, accerr_check         // protection violation check
 *            bfset       #0x20, X:(R2+0x13)        // clear pviol
 *            bra    hfm_wait
 *        accerr_check:
 *            brclr       #0x10, A, hfm_wait         // access error check
 *            bfset       #0x10, X:(R2+0x13)        // clear accerr
 *          bra     hfm_wait                // loop
 * 0x00000000  0x8A460013807D    brclr       #0x80, X:(R2+0x13),*+0
 * 0x00000003  0xE700        nop
 * 0x00000004  0xE700        nop
 * 0x00000005  0x8A44FFFE017B    brclr       #1, X:(R0-2),*-2
 * 0x00000008  0xE700        nop
 * 0x00000009  0xF514        move.w      X:(R0), Y0
 * 0x0000000A  0x8563        move.w      Y0, P:(R3)+
 * 0x0000000B  0x864600200014    move.w      #32, X:(R2+0x14)
 * 0x0000000E  0x864600800013    move.w      #128, X:(R2+0x13)
 * 0x00000011  0xF0420013        move.w      X:(R2+0x13), A
 * 0x00000013  0x8B402004        brclr       #0x20, A,*+6
 * 0x00000015  0x824600130020    bfset       #0x20, X:(R2+0x13)
 * 0x00000018  0xA967        bra     *-24
 * 0x00000019  0x8B401065        brclr       #0x10, A,*-25
 * 0x0000001B  0x824600130010    bfset       #0x10, X:(R2+0x13)
 * 0x0000001E  0xA961        bra     *-30
 */
 
static const uint16_t pgm_write_pflash[] = {
        0x8A46, 0x0013, 0x807D, 0xE700,
        0xE700, 0x8A44, 0xFFFE, 0x017B,
        0xE700, 0xF514, 0x8563, 0x8646,
        0x0020, 0x0014, 0x8646, 0x0080,
        0x0013, 0xF042, 0x0013, 0x8B40,
        0x2004, 0x8246, 0x0013, 0x0020,
        0xA967, 0x8B40, 0x1065, 0x8246,
        0x0013, 0x0010, 0xA961
};
 
static const uint32_t pgm_write_pflash_length = 31;
 
int dsp5680xx_f_wr(struct target *t, const uint8_t *b, uint32_t a, uint32_t count,
           int is_flash_lock)
{
    struct target *target = t;
 
    uint32_t address = a;
 
    const uint8_t *buffer = b;
 
    int retval = ERROR_OK;
 
    if (!dsp5680xx_context.debug_mode_enabled) {
        retval = eonce_enter_debug_mode(target, NULL);
        if (retval != ERROR_OK)
            return retval;
    }
    /*
     * Download the pgm that flashes.
     *
     */
    const uint32_t len = pgm_write_pflash_length;
 
    uint32_t ram_addr = 0x8700;
 
    /*
     * This seems to be a safe address.
     * This one is the one used by codewarrior in 56801x_flash.cfg
     */
    if (!is_flash_lock) {
        retval =
            dsp5680xx_write(target, ram_addr, 1, len * 2,
                    (uint8_t *) pgm_write_pflash);
        if (retval != ERROR_OK)
            return retval;
        retval = dsp5680xx_execute_queue();
        if (retval != ERROR_OK)
            return retval;
    }
    /*
     * Set hfmdiv
     *
     */
    retval = set_fm_ck_div(target);
    if (retval != ERROR_OK)
        return retval;
    /*
     * Setup registers needed by pgm_write_pflash
     *
     */
 
    dsp5680xx_context.flush = 0;
 
    retval = core_move_long_to_r3(target, address); /* Destination address to r3 */
    if (retval != ERROR_OK)
        return retval;
    retval = core_load_tx_rx_high_addr_to_r0(target); /* TX/RX reg address to r0 */
    if (retval != ERROR_OK)
        return retval;
    retval = core_move_long_to_r2(target, HFM_BASE_ADDR); /* FM base address to r2 */
    if (retval != ERROR_OK)
        return retval;
    /*
     * Run flashing program.
     *
     */
    /* write to HFM_CNFG (lock=0, select bank) */
    retval = core_move_value_at_r2_disp(target, 0x00, HFM_CNFG);
    if (retval != ERROR_OK)
        return retval;
    /* write to HMF_USTAT, clear PVIOL, ACCERR &BLANK bits */
    retval = core_move_value_at_r2_disp(target, 0x04, HFM_USTAT);
    if (retval != ERROR_OK)
        return retval;
    /* clear only one bit at a time */
    retval = core_move_value_at_r2_disp(target, 0x10, HFM_USTAT);
    if (retval != ERROR_OK)
        return retval;
    retval = core_move_value_at_r2_disp(target, 0x20, HFM_USTAT);
    if (retval != ERROR_OK)
        return retval;
    /* write to HMF_PROT, clear protection */
    retval = core_move_value_at_r2_disp(target, 0x00, HFM_PROT);
    if (retval != ERROR_OK)
        return retval;
    /* write to HMF_PROTB, clear protection */
    retval = core_move_value_at_r2_disp(target, 0x00, HFM_PROTB);
    if (retval != ERROR_OK)
        return retval;
    if (count % 2) {
        /* TODO implement handling of odd number of words. */
        const char *msg = "Cannot handle odd number of words.";
 
        err_log(DSP5680XX_ERROR_FLASHING_INVALID_WORD_COUNT, msg);
        return ERROR_FAIL;
    }
 
    dsp5680xx_context.flush = 1;
    retval = dsp5680xx_execute_queue();
    if (retval != ERROR_OK)
        return retval;
 
    uint32_t drscan_data;
 
    uint16_t tmp = (buffer[0] | (buffer[1] << 8));
 
    retval = core_tx_upper_data(target, tmp, &drscan_data);
    if (retval != ERROR_OK)
        return retval;
 
    retval = dsp5680xx_resume(target, false, ram_addr, false, false);
    if (retval != ERROR_OK)
        return retval;
 
    int counter = FLUSH_COUNT_FLASH;
 
    dsp5680xx_context.flush = 0;
    uint32_t i;
 
    for (i = 1; (i < count / 2) && (i < HFM_SIZE_WORDS); i++) {
        if (--counter == 0) {
            dsp5680xx_context.flush = 1;
            counter = FLUSH_COUNT_FLASH;
        }
        tmp = (buffer[2 * i] | (buffer[2 * i + 1] << 8));
        retval = core_tx_upper_data(target, tmp, &drscan_data);
        if (retval != ERROR_OK) {
            dsp5680xx_context.flush = 1;
            return retval;
        }
        dsp5680xx_context.flush = 0;
    }
    dsp5680xx_context.flush = 1;
    if (!is_flash_lock) {
        /*
         *Verify flash (skip when exec lock sequence)
         *
         */
        uint16_t signature;
 
        uint16_t pc_crc;
 
        retval = dsp5680xx_f_signature(target, address, i, &signature);
        if (retval != ERROR_OK)
            return retval;
        pc_crc = perl_crc(buffer, i);
        if (pc_crc != signature) {
            const char *msg =
                "Flashed data failed CRC check, flash again!";
            err_log(DSP5680XX_ERROR_FLASHING_CRC, msg);
            return ERROR_FAIL;
        }
    }
    return retval;
}
 
int dsp5680xx_f_unlock(struct target *target)
{
    uint16_t eonce_status;
 
    uint32_t ir_out;
 
    struct jtag_tap *tap_chp = jtag_tap_by_string("dsp568013.chp");
    if (!tap_chp) {
        err_log(DSP5680XX_ERROR_JTAG_TAP_ENABLE_MASTER,
              "Failed to get master tap.");
        return ERROR_FAIL;
    }
    struct jtag_tap *tap_cpu = jtag_tap_by_string("dsp568013.cpu");
    if (!tap_cpu) {
        err_log(DSP5680XX_ERROR_JTAG_TAP_ENABLE_CORE,
              "Failed to get master tap.");
        return ERROR_FAIL;
    }
 
    int retval = eonce_enter_debug_mode_without_reset(target, &eonce_status);
    if (retval == ERROR_OK)
        LOG_WARNING("Memory was not locked.");
 
    jtag_add_reset(0, 1);
    jtag_add_sleep(TIME_DIV_FREESCALE * 200 * 1000);
 
    retval = reset_jtag();
    if (retval != ERROR_OK) {
        err_log(DSP5680XX_ERROR_JTAG_RESET,
              "Failed to reset JTAG state machine");
        return retval;
    }
    jtag_add_sleep(150);
 
    /* Enable core tap */
    tap_chp->enabled = true;
    retval = switch_tap(target, tap_chp, tap_cpu);
    if (retval != ERROR_OK)
        return retval;
 
    uint32_t instr = JTAG_INSTR_DEBUG_REQUEST;
    retval =
        dsp5680xx_irscan(target, &instr, &ir_out,
                 DSP5680XX_JTAG_CORE_TAP_IRLEN);
    if (retval != ERROR_OK)
        return retval;
    jtag_add_sleep(TIME_DIV_FREESCALE * 100 * 1000);
    jtag_add_reset(0, 0);
    jtag_add_sleep(TIME_DIV_FREESCALE * 300 * 1000);
 
    /* Enable master tap */
    tap_chp->enabled = false;
    retval = switch_tap(target, tap_chp, tap_cpu);
    if (retval != ERROR_OK)
        return retval;
 
    /* Execute mass erase to unlock */
    instr = MASTER_TAP_CMD_FLASH_ERASE;
    retval =
        dsp5680xx_irscan(target, &instr, &ir_out,
                 DSP5680XX_JTAG_MASTER_TAP_IRLEN);
    if (retval != ERROR_OK)
        return retval;
 
    instr = HFM_CLK_DEFAULT;
    retval = dsp5680xx_drscan(target, (uint8_t *) &instr, (uint8_t *) &ir_out, 16);
    if (retval != ERROR_OK)
        return retval;
 
    jtag_add_sleep(TIME_DIV_FREESCALE * 150 * 1000);
    jtag_add_reset(0, 1);
    jtag_add_sleep(TIME_DIV_FREESCALE * 200 * 1000);
 
    retval = reset_jtag();
    if (retval != ERROR_OK) {
        err_log(DSP5680XX_ERROR_JTAG_RESET,
              "Failed to reset JTAG state machine");
        return retval;
    }
    jtag_add_sleep(150);
 
    instr = 0x0606ffff;
    retval = dsp5680xx_drscan(target, (uint8_t *) &instr, (uint8_t *) &ir_out,
                 32);
    if (retval != ERROR_OK)
        return retval;
 
    /* enable core tap */
    instr = 0x5;
    retval =
        dsp5680xx_irscan(target, &instr, &ir_out,
                 DSP5680XX_JTAG_MASTER_TAP_IRLEN);
    if (retval != ERROR_OK)
        return retval;
    instr = 0x2;
    retval = dsp5680xx_drscan(target, (uint8_t *) &instr, (uint8_t *) &ir_out,
                 4);
    if (retval != ERROR_OK)
        return retval;
 
    tap_cpu->enabled = true;
    tap_chp->enabled = false;
    target->state = TARGET_RUNNING;
    dsp5680xx_context.debug_mode_enabled = false;
    return ERROR_OK;
}
 
int dsp5680xx_f_lock(struct target *target)
{
    uint16_t lock_word = HFM_LOCK_FLASH;
    int retval = dsp5680xx_f_wr(target, (uint8_t *)&lock_word, HFM_LOCK_ADDR_L, 2, 1);
    if (retval != ERROR_OK)
        return retval;
 
    jtag_add_reset(0, 1);
    jtag_add_sleep(TIME_DIV_FREESCALE * 200 * 1000);
 
    retval = reset_jtag();
    if (retval != ERROR_OK) {
        err_log(DSP5680XX_ERROR_JTAG_RESET,
              "Failed to reset JTAG state machine");
        return retval;
    }
    jtag_add_sleep(TIME_DIV_FREESCALE * 100 * 1000);
    jtag_add_reset(0, 0);
    jtag_add_sleep(TIME_DIV_FREESCALE * 300 * 1000);
 
    struct jtag_tap *tap_chp = jtag_tap_by_string("dsp568013.chp");
    if (!tap_chp) {
        err_log(DSP5680XX_ERROR_JTAG_TAP_ENABLE_MASTER,
              "Failed to get master tap.");
        return ERROR_FAIL;
    }
    struct jtag_tap *tap_cpu = jtag_tap_by_string("dsp568013.cpu");
    if (!tap_cpu) {
        err_log(DSP5680XX_ERROR_JTAG_TAP_ENABLE_CORE,
              "Failed to get master tap.");
        return ERROR_FAIL;
    }
    target->state = TARGET_RUNNING;
    dsp5680xx_context.debug_mode_enabled = false;
    tap_cpu->enabled = false;
    tap_chp->enabled = true;
    return switch_tap(target, tap_chp, tap_cpu);
}
 
static int dsp5680xx_step(struct target *target, bool current, target_addr_t address,
        bool handle_breakpoints)
{
    err_log(DSP5680XX_ERROR_NOT_IMPLEMENTED_STEP,
          "Not implemented yet.");
    return ERROR_FAIL;
}
 
struct target_type dsp5680xx_target = {
    .name = "dsp5680xx",
 
    .poll = dsp5680xx_poll,
    .arch_state = dsp5680xx_arch_state,
 
    .halt = dsp5680xx_halt,
    .resume = dsp5680xx_resume,
    .step = dsp5680xx_step,
 
    .write_buffer = dsp5680xx_write_buffer,
    .read_buffer = dsp5680xx_read_buffer,
 
    .assert_reset = dsp5680xx_assert_reset,
    .deassert_reset = dsp5680xx_deassert_reset,
    .soft_reset_halt = dsp5680xx_soft_reset_halt,
 
    .read_memory = dsp5680xx_read,
    .write_memory = dsp5680xx_write,
 
    .checksum_memory = dsp5680xx_checksum_memory,
 
    .target_create = dsp5680xx_target_create,
    .init_target = dsp5680xx_init_target,
};