arm_jtag.c

Go to the documentation of this file.

// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *   Copyright (C) 2005 by Dominic Rath                                    *
 *   Dominic.Rath@gmx.de                                                   *
 *                                                                         *
 *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
 *   oyvind.harboe@zylin.com                                               *
 ***************************************************************************/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "arm_jtag.h"
 
#if 0
#define _ARM_JTAG_SCAN_N_CHECK_
#endif
 
int arm_jtag_set_instr_inner(struct jtag_tap *tap,
        uint32_t new_instr, void *no_verify_capture, tap_state_t end_state)
{
    struct scan_field field;
    uint8_t t[4] = { 0 };
 
    field.num_bits = tap->ir_length;
    field.out_value = t;
    buf_set_u32(t, 0, field.num_bits, new_instr);
    field.in_value = NULL;
 
    if (!no_verify_capture)
        jtag_add_ir_scan(tap, &field, end_state);
    else {
        /* FIX!!!! this is a kludge!!! arm926ejs.c should reimplement this arm_jtag_set_instr to
         * have special verification code.
         */
        jtag_add_ir_scan_noverify(tap, &field, end_state);
    }
 
    return ERROR_OK;
}
 
int arm_jtag_scann_inner(struct arm_jtag *jtag_info, uint32_t new_scan_chain, tap_state_t end_state)
{
    int retval = ERROR_OK;
 
    uint8_t out_value[4] = { 0 };
    buf_set_u32(out_value, 0, jtag_info->scann_size, new_scan_chain);
    struct scan_field field = { .num_bits = jtag_info->scann_size, .out_value = out_value, };
 
    retval = arm_jtag_set_instr(jtag_info->tap, jtag_info->scann_instr, NULL, end_state);
    if (retval != ERROR_OK)
        return retval;
 
    jtag_add_dr_scan(jtag_info->tap,
            1,
            &field,
            end_state);
 
    jtag_info->cur_scan_chain = new_scan_chain;
 
    return retval;
}
 
static int arm_jtag_reset_callback(enum jtag_event event, void *priv)
{
    struct arm_jtag *jtag_info = priv;
 
    if (event == JTAG_TRST_ASSERTED)
        jtag_info->cur_scan_chain = 0;
 
    return ERROR_OK;
}
 
int arm_jtag_setup_connection(struct arm_jtag *jtag_info)
{
    jtag_info->scann_instr = 0x2;
    jtag_info->cur_scan_chain = 0;
    jtag_info->intest_instr = 0xc;
 
    return jtag_register_event_callback(arm_jtag_reset_callback, jtag_info);
}
 
int arm_jtag_close_connection(struct arm_jtag *jtag_info)
{
    return jtag_unregister_event_callback(arm_jtag_reset_callback, jtag_info);
}