or1k_tap_mohor.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *   Copyright (C) 2013 by Franck Jullien                                  *
 *   elec4fun@gmail.com                                                    *
 ***************************************************************************/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "or1k_tap.h"
#include "or1k.h"
 
#include <jtag/jtag.h>
 
#define OR1K_TAP_INST_DEBUG 0x8
 
static int or1k_tap_mohor_init(struct or1k_jtag *jtag_info)
{
    LOG_DEBUG("Initialising OpenCores JTAG TAP");
 
    /* Put TAP into state where it can talk to the debug interface
     * by shifting in correct value to IR.
     */
 
    /* Ensure TAP is reset - maybe not necessary*/
    jtag_add_tlr();
 
    struct jtag_tap *tap = jtag_info->tap;
    struct scan_field field;
    uint8_t ir_value = OR1K_TAP_INST_DEBUG;
 
    field.num_bits = tap->ir_length;
    field.out_value = &ir_value;
    field.in_value = NULL;
 
    jtag_add_ir_scan(tap, &field, TAP_IDLE);
 
    return jtag_execute_queue();
}
 
static struct or1k_tap_ip mohor_tap = {
    .name = "mohor",
    .init = or1k_tap_mohor_init,
};
 
int or1k_tap_mohor_register(void)
{
    list_add_tail(&mohor_tap.list, &tap_list);
    return 0;
}