104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*
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* This file is part of the Black Magic Debug project.
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*
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* Copyright (C) 2011 Black Sphere Technologies Ltd.
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* Written by Gareth McMullin <gareth@blacksphere.co.nz>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* This file implements the JTAG-DP specific functions of the
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* ARM Debug Interface v5 Architecure Specification, ARM doc IHI0031A.
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*/
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#include "general.h"
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#include "adiv5.h"
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#include "jtag_scan.h"
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#include "jtagtap.h"
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#include "morse.h"
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#define JTAGDP_ACK_OK 0x02
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#define JTAGDP_ACK_WAIT 0x01
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/* 35-bit registers that control the ADIv5 DP */
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#define IR_ABORT 0x8
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#define IR_DPACC 0xA
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#define IR_APACC 0xB
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static uint32_t adiv5_jtagdp_read(ADIv5_DP_t *dp, uint16_t addr);
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static uint32_t adiv5_jtagdp_error(ADIv5_DP_t *dp);
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static uint32_t adiv5_jtagdp_low_access(ADIv5_DP_t *dp, uint8_t RnW,
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uint16_t addr, uint32_t value);
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void adiv5_jtag_dp_handler(jtag_dev_t *dev)
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{
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ADIv5_DP_t *dp = (void*)calloc(1, sizeof(*dp));
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dp->dev = dev;
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dp->idcode = dev->idcode;
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dp->dp_read = adiv5_jtagdp_read;
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dp->error = adiv5_jtagdp_error;
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dp->low_access = adiv5_jtagdp_low_access;
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adiv5_dp_init(dp);
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}
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static uint32_t adiv5_jtagdp_read(ADIv5_DP_t *dp, uint16_t addr)
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{
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adiv5_jtagdp_low_access(dp, ADIV5_LOW_READ, addr, 0);
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return adiv5_jtagdp_low_access(dp, ADIV5_LOW_READ,
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ADIV5_DP_RDBUFF, 0);
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}
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static uint32_t adiv5_jtagdp_error(ADIv5_DP_t *dp)
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{
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adiv5_jtagdp_low_access(dp, ADIV5_LOW_READ, ADIV5_DP_CTRLSTAT, 0);
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return adiv5_jtagdp_low_access(dp, ADIV5_LOW_WRITE,
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ADIV5_DP_CTRLSTAT, 0xF0000032) & 0x32;
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}
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static uint32_t adiv5_jtagdp_low_access(ADIv5_DP_t *dp, uint8_t RnW,
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uint16_t addr, uint32_t value)
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{
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bool APnDP = addr & ADIV5_APnDP;
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addr &= 0xff;
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uint64_t request, response;
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uint8_t ack;
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request = ((uint64_t)value << 3) | ((addr >> 1) & 0x06) | (RnW?1:0);
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jtag_dev_write_ir(dp->dev, APnDP ? IR_APACC : IR_DPACC);
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int tries = 1000;
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do {
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jtag_dev_shift_dr(dp->dev, (uint8_t*)&response, (uint8_t*)&request, 35);
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ack = response & 0x07;
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} while(--tries && (ack == JTAGDP_ACK_WAIT));
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if (dp->allow_timeout && (ack == JTAGDP_ACK_WAIT))
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return 0;
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if((ack != JTAGDP_ACK_OK)) {
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/* Fatal error if invalid ACK response */
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PLATFORM_FATAL_ERROR(1);
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}
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return (uint32_t)(response >> 3);
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}
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