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// SPDX-License-Identifier: GPL-2.0-or-later
/***************************************************************************
* Copyright (C) 2006 by Magnus Lundin
* lundin@mlu.mine.nu
*
* Copyright (C) 2008 by Spencer Oliver
* spen@spen-soft.co.uk
*
* Copyright (C) 2009 by Oyvind Harboe
* oyvind.harboe@zylin.com
*
* Copyright (C) 2009-2010 by David Brownell
*
* Copyright (C) 2020-2021, Ampere Computing LLC *
***************************************************************************/
/**
* @file
* This file implements JTAG transport support for cores implementing
the ARM Debug Interface version 5 (ADIv5) and version 6 (ADIv6).
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "arm.h"
#include "arm_adi_v5.h"
#include <helper/time_support.h>
#include <helper/list.h>
#include <jtag/swd.h>
/*#define DEBUG_WAIT*/
/* JTAG instructions/registers for JTAG-DP and SWJ-DP */
#define JTAG_DP_ABORT 0xF8
#define JTAG_DP_DPACC 0xFA
#define JTAG_DP_APACC 0xFB
#define JTAG_DP_IDCODE 0xFE
/* three-bit ACK values for DPACC and APACC reads */
#define JTAG_ACK_WAIT 0x1 /* ADIv5 and ADIv6 */
#define JTAG_ACK_OK_FAULT 0x2 /* ADIv5 */
#define JTAG_ACK_FAULT 0x2 /* ADIv6 */
#define JTAG_ACK_OK 0x4 /* ADIV6 */
static int jtag_ap_q_abort(struct adiv5_dap *dap, uint8_t *ack);
#ifdef DEBUG_WAIT
static const char *dap_reg_name(struct adiv5_dap *dap, uint8_t instr, uint16_t reg_addr)
{
char *reg_name = "UNK";
if (instr == JTAG_DP_DPACC) {
switch (reg_addr) {
case DP_ABORT:
reg_name = "ABORT";
break;
case DP_CTRL_STAT:
reg_name = "CTRL/STAT";
break;
case DP_SELECT:
reg_name = "SELECT";
break;
case DP_RDBUFF:
reg_name = "RDBUFF";
break;
case DP_DLCR:
reg_name = "DLCR";
break;
default:
reg_name = "UNK";
break;
}
}
if (instr == JTAG_DP_APACC) {
if (reg_addr == MEM_AP_REG_CSW(dap))
reg_name = "CSW";
else if (reg_addr == MEM_AP_REG_TAR(dap))
reg_name = "TAR";
else if (reg_addr == MEM_AP_REG_TAR64(dap))
reg_name = "TAR64";
else if (reg_addr == MEM_AP_REG_DRW(dap))
reg_name = "DRW";
else if (reg_addr == MEM_AP_REG_BD0(dap))
reg_name = "BD0";
else if (reg_addr == MEM_AP_REG_BD1(dap))
reg_name = "BD1";
else if (reg_addr == MEM_AP_REG_BD2(dap))
reg_name = "BD2";
else if (reg_addr == MEM_AP_REG_BD3(dap))
reg_name = "BD3";
else if (reg_addr == MEM_AP_REG_CFG(dap))
reg_name = "CFG";
else if (reg_addr == MEM_AP_REG_BASE(dap))
reg_name = "BASE";
else if (reg_addr == MEM_AP_REG_BASE64(dap))
reg_name = "BASE64";
else if (reg_addr == AP_REG_IDR(dap))
reg_name = "IDR";
else
reg_name = "UNK";
}
return reg_name;
}
#endif
struct dap_cmd {
struct list_head lh;
uint8_t instr;
uint16_t reg_addr;
uint8_t rnw;
uint8_t *invalue;
uint8_t ack;
uint32_t memaccess_tck;
uint64_t dp_select;
struct scan_field fields[2];
uint8_t out_addr_buf;
uint8_t invalue_buf[4];
uint8_t outvalue_buf[4];
};
#define MAX_DAP_COMMAND_NUM 65536
struct dap_cmd_pool {
struct list_head lh;
struct dap_cmd cmd;
};
static void log_dap_cmd(struct adiv5_dap *dap, const char *header, struct dap_cmd *el)
{
#ifdef DEBUG_WAIT
const char *ack;
switch (el->ack) {
case JTAG_ACK_WAIT: /* ADIv5 and ADIv6 */
ack = "WAIT";
break;
case JTAG_ACK_OK_FAULT: /* ADIv5, same value as JTAG_ACK_FAULT */
/* case JTAG_ACK_FAULT: */ /* ADIv6 */
if (is_adiv6(dap))
ack = "FAULT";
else
ack = "OK";
break;
case JTAG_ACK_OK: /* ADIv6 */
if (is_adiv6(dap)) {
ack = "OK";
break;
}
/* fall-through */
default:
ack = "INVAL";
break;
}
LOG_DEBUG("%s: %2s %6s %5s 0x%08x 0x%08x %2s", header,
el->instr == JTAG_DP_APACC ? "AP" : "DP",
dap_reg_name(dap, el->instr, el->reg_addr),
el->rnw == DPAP_READ ? "READ" : "WRITE",
buf_get_u32(el->outvalue_buf, 0, 32),
buf_get_u32(el->invalue, 0, 32),
ack);
#endif
}
static int jtag_limit_queue_size(struct adiv5_dap *dap)
{
if (dap->cmd_pool_size < MAX_DAP_COMMAND_NUM)
return ERROR_OK;
return dap_run(dap);
}
static struct dap_cmd *dap_cmd_new(struct adiv5_dap *dap, uint8_t instr,
uint16_t reg_addr, uint8_t rnw,
uint8_t *outvalue, uint8_t *invalue,
uint32_t memaccess_tck)
{
struct dap_cmd_pool *pool = NULL;
if (list_empty(&dap->cmd_pool)) {
pool = calloc(1, sizeof(struct dap_cmd_pool));
if (!pool)
return NULL;
} else {
pool = list_first_entry(&dap->cmd_pool, struct dap_cmd_pool, lh);
list_del(&pool->lh);
}
INIT_LIST_HEAD(&pool->lh);
dap->cmd_pool_size++;
struct dap_cmd *cmd = &pool->cmd;
INIT_LIST_HEAD(&cmd->lh);
cmd->instr = instr;
cmd->reg_addr = reg_addr;
cmd->rnw = rnw;
if (outvalue)
memcpy(cmd->outvalue_buf, outvalue, 4);
cmd->invalue = (invalue) ? invalue : cmd->invalue_buf;
cmd->memaccess_tck = memaccess_tck;
return cmd;
}
static void dap_cmd_release(struct adiv5_dap *dap, struct dap_cmd *cmd)
{
struct dap_cmd_pool *pool = container_of(cmd, struct dap_cmd_pool, cmd);
if (dap->cmd_pool_size > MAX_DAP_COMMAND_NUM)
free(pool);
else
list_add(&pool->lh, &dap->cmd_pool);
dap->cmd_pool_size--;
}
static void flush_journal(struct adiv5_dap *dap, struct list_head *lh)
{
struct dap_cmd *el, *tmp;
list_for_each_entry_safe(el, tmp, lh, lh) {
list_del(&el->lh);
dap_cmd_release(dap, el);
}
}
static void jtag_quit(struct adiv5_dap *dap)
{
struct dap_cmd_pool *el, *tmp;
struct list_head *lh = &dap->cmd_pool;
list_for_each_entry_safe(el, tmp, lh, lh) {
list_del(&el->lh);
free(el);
}
}
/***************************************************************************
*
* DPACC and APACC scanchain access through JTAG-DP (or SWJ-DP)
*
***************************************************************************/
static int adi_jtag_dp_scan_cmd(struct adiv5_dap *dap, struct dap_cmd *cmd, uint8_t *ack)
{
struct jtag_tap *tap = dap->tap;
int retval;
retval = arm_jtag_set_instr(tap, cmd->instr, NULL, TAP_IDLE);
if (retval != ERROR_OK)
return retval;
/* Scan out a read or write operation using some DP or AP register.
* For APACC access with any sticky error flag set, this is discarded.
*/
cmd->fields[0].num_bits = 3;
buf_set_u32(&cmd->out_addr_buf, 0, 3, ((cmd->reg_addr >> 1) & 0x6) | (cmd->rnw & 0x1));
cmd->fields[0].out_value = &cmd->out_addr_buf;
cmd->fields[0].in_value = (ack) ? ack : &cmd->ack;
/* NOTE: if we receive JTAG_ACK_WAIT, the previous operation did not
* complete; data we write is discarded, data we read is unpredictable.
* When overrun detect is active, STICKYORUN is set.
*/
cmd->fields[1].num_bits = 32;
cmd->fields[1].out_value = cmd->outvalue_buf;
cmd->fields[1].in_value = cmd->invalue;
jtag_add_dr_scan(tap, 2, cmd->fields, TAP_IDLE);
/* Add specified number of tck clocks after starting AP register
* access or memory bus access, giving the hardware time to complete
* the access.
* They provide more time for the (MEM) AP to complete the read ...
* See "Minimum Response Time" for JTAG-DP, in the ADIv5/ADIv6 spec.
*/
if (cmd->instr == JTAG_DP_APACC && cmd->memaccess_tck != 0)
jtag_add_runtest(cmd->memaccess_tck, TAP_IDLE);
return ERROR_OK;
}
static int adi_jtag_dp_scan_cmd_sync(struct adiv5_dap *dap, struct dap_cmd *cmd, uint8_t *ack)
{
int retval;
retval = adi_jtag_dp_scan_cmd(dap, cmd, ack);
if (retval != ERROR_OK)
return retval;
return jtag_execute_queue();
}
/**
* Scan DPACC or APACC using target ordered uint8_t buffers. No endianness
* conversions are performed. See section 4.4.3 of the ADIv5/ADIv6 spec, which
* discusses operations which access these registers.
*
* Note that only one scan is performed. If rnw is set, a separate scan
* will be needed to collect the data which was read; the "invalue" collects
* the posted result of a preceding operation, not the current one.
*
* @param dap the DAP
* @param instr JTAG_DP_APACC (AP access) or JTAG_DP_DPACC (DP access)
* @param reg_addr two significant bits; A[3:2]; for APACC access, the
* SELECT register has more addressing bits.
* @param rnw false iff outvalue will be written to the DP or AP
* @param outvalue points to a 32-bit (little-endian) integer
* @param invalue NULL, or points to a 32-bit (little-endian) integer
* @param ack points to where the three bit JTAG_ACK_* code will be stored
* @param memaccess_tck number of idle cycles to add after AP access
*/
static int adi_jtag_dp_scan(struct adiv5_dap *dap,
uint8_t instr, uint16_t reg_addr, uint8_t rnw,
uint8_t *outvalue, uint8_t *invalue,
uint32_t memaccess_tck, uint8_t *ack)
{
struct dap_cmd *cmd;
int retval;
cmd = dap_cmd_new(dap, instr, reg_addr, rnw, outvalue, invalue, memaccess_tck);
if (cmd)
cmd->dp_select = dap->select;
else
return ERROR_JTAG_DEVICE_ERROR;
retval = adi_jtag_dp_scan_cmd(dap, cmd, ack);
if (retval == ERROR_OK)
list_add_tail(&cmd->lh, &dap->cmd_journal);
return retval;
}
/**
* Scan DPACC or APACC out and in from host ordered uint32_t buffers.
* This is exactly like adi_jtag_dp_scan(), except that endianness
* conversions are performed (so the types of invalue and outvalue
* must be different).
*/
static int adi_jtag_dp_scan_u32(struct adiv5_dap *dap,
uint8_t instr, uint16_t reg_addr, uint8_t rnw,
uint32_t outvalue, uint32_t *invalue,
uint32_t memaccess_tck, uint8_t *ack)
{
uint8_t out_value_buf[4];
int retval;
uint64_t sel = (reg_addr >> 4) & DP_SELECT_DPBANK;
/* No need to change SELECT or RDBUFF as they are not banked */
if (instr == JTAG_DP_DPACC && reg_addr != DP_SELECT && reg_addr != DP_RDBUFF
&& (!dap->select_valid || sel != (dap->select & DP_SELECT_DPBANK))) {
/* Use the AP part of dap->select regardless of dap->select_valid:
* if !dap->select_valid
* dap->select contains a speculative value likely going to be used
* in the following swd_queue_ap_bankselect() */
sel |= dap->select & SELECT_AP_MASK;
LOG_DEBUG_IO("DP BANK SELECT: %" PRIx32, (uint32_t)sel);
buf_set_u32(out_value_buf, 0, 32, (uint32_t)sel);
retval = adi_jtag_dp_scan(dap, JTAG_DP_DPACC,
DP_SELECT, DPAP_WRITE, out_value_buf, NULL, 0, NULL);
if (retval != ERROR_OK)
return retval;
dap->select = sel;
dap->select_valid = true;
}
buf_set_u32(out_value_buf, 0, 32, outvalue);
retval = adi_jtag_dp_scan(dap, instr, reg_addr, rnw,
out_value_buf, (uint8_t *)invalue, memaccess_tck, ack);
if (retval != ERROR_OK)
return retval;
if (invalue)
jtag_add_callback(arm_le_to_h_u32,
(jtag_callback_data_t) invalue);
return retval;
}
static int adi_jtag_finish_read(struct adiv5_dap *dap)
{
int retval = ERROR_OK;
if (dap->last_read) {
retval = adi_jtag_dp_scan_u32(dap, JTAG_DP_DPACC,
DP_RDBUFF, DPAP_READ, 0, dap->last_read, 0, NULL);
dap->last_read = NULL;
}
return retval;
}
static int adi_jtag_scan_inout_check_u32(struct adiv5_dap *dap,
uint8_t instr, uint16_t reg_addr, uint8_t rnw,
uint32_t outvalue, uint32_t *invalue, uint32_t memaccess_tck)
{
int retval;
/* Issue the read or write */
retval = adi_jtag_dp_scan_u32(dap, instr, reg_addr,
rnw, outvalue, NULL, memaccess_tck, NULL);
if (retval != ERROR_OK)
return retval;
/* For reads, collect posted value; RDBUFF has no other effect.
* Assumes read gets acked with OK/FAULT, and CTRL_STAT says "OK".
*/
if ((rnw == DPAP_READ) && (invalue)) {
retval = adi_jtag_dp_scan_u32(dap, JTAG_DP_DPACC,
DP_RDBUFF, DPAP_READ, 0, invalue, 0, NULL);
if (retval != ERROR_OK)
return retval;
}
return jtag_execute_queue();
}
static int jtagdp_overrun_check(struct adiv5_dap *dap)
{
int retval;
struct dap_cmd *el, *tmp, *prev = NULL;
int found_wait = 0;
int64_t time_now;
LIST_HEAD(replay_list);
/* make sure all queued transactions are complete */
retval = jtag_execute_queue();
if (retval != ERROR_OK)
goto done;
/* skip all completed transactions up to the first WAIT */
list_for_each_entry(el, &dap->cmd_journal, lh) {
/*
* JTAG_ACK_OK_FAULT (ADIv5) and JTAG_ACK_FAULT (ADIv6) are equal so
* the following statement is checking to see if an acknowledgment of
* OK or FAULT is generated for ADIv5 or ADIv6
*/
if (el->ack == JTAG_ACK_OK_FAULT || (is_adiv6(dap) && el->ack == JTAG_ACK_OK)) {
log_dap_cmd(dap, "LOG", el);
} else if (el->ack == JTAG_ACK_WAIT) {
found_wait = 1;
break;
} else {
LOG_ERROR("Invalid ACK (%1x) in DAP response", el->ack);
log_dap_cmd(dap, "ERR", el);
retval = ERROR_JTAG_DEVICE_ERROR;
goto done;
}
}
/*
* If we found a stalled transaction and a previous transaction
* exists, check if it's a READ access.
*/
if (found_wait && el != list_first_entry(&dap->cmd_journal, struct dap_cmd, lh)) {
prev = list_entry(el->lh.prev, struct dap_cmd, lh);
if (prev->rnw == DPAP_READ) {
log_dap_cmd(dap, "PND", prev);
/* search for the next OK transaction, it contains
* the result of the previous READ */
tmp = el;
list_for_each_entry_from(tmp, &dap->cmd_journal, lh) {
/* The following check covers OK and FAULT ACKs for both ADIv5 and ADIv6 */
if (tmp->ack == JTAG_ACK_OK_FAULT || (is_adiv6(dap) && tmp->ack == JTAG_ACK_OK)) {
/* recover the read value */
log_dap_cmd(dap, "FND", tmp);
if (el->invalue != el->invalue_buf) {
uint32_t invalue = le_to_h_u32(tmp->invalue);
memcpy(el->invalue, &invalue, sizeof(uint32_t));
}
prev = NULL;
break;
}
}
if (prev) {
log_dap_cmd(dap, "LST", el);
/*
* At this point we're sure that no previous
* transaction completed and the DAP/AP is still
* in busy state. We know that the next "OK" scan
* will return the READ result we need to recover.
* To complete the READ, we just keep polling RDBUFF
* until the WAIT condition clears
*/
tmp = dap_cmd_new(dap, JTAG_DP_DPACC,
DP_RDBUFF, DPAP_READ, NULL, NULL, 0);
if (!tmp) {
retval = ERROR_JTAG_DEVICE_ERROR;
goto done;
}
/* synchronously retry the command until it succeeds */
time_now = timeval_ms();
do {
retval = adi_jtag_dp_scan_cmd_sync(dap, tmp, NULL);
if (retval != ERROR_OK)
break;
/* The following check covers OK and FAULT ACKs for both ADIv5 and ADIv6 */
if (tmp->ack == JTAG_ACK_OK_FAULT || (is_adiv6(dap) && tmp->ack == JTAG_ACK_OK)) {
log_dap_cmd(dap, "FND", tmp);
if (el->invalue != el->invalue_buf) {
uint32_t invalue = le_to_h_u32(tmp->invalue);
memcpy(el->invalue, &invalue, sizeof(uint32_t));
}
break;
}
if (tmp->ack != JTAG_ACK_WAIT) {
LOG_ERROR("Invalid ACK (%1x) in DAP response", tmp->ack);
log_dap_cmd(dap, "ERR", tmp);
retval = ERROR_JTAG_DEVICE_ERROR;
break;
}
} while (timeval_ms() - time_now < 1000);
if (retval == ERROR_OK) {
/* timeout happened */
if (tmp->ack == JTAG_ACK_WAIT) {
LOG_ERROR("Timeout during WAIT recovery");
dap->select_valid = false;
dap->select1_valid = false;
/* Keep dap->select unchanged, the same AP and AP bank
* is likely going to be used further */
jtag_ap_q_abort(dap, NULL);
/* clear the sticky overrun condition */
adi_jtag_scan_inout_check_u32(dap, JTAG_DP_DPACC,
DP_CTRL_STAT, DPAP_WRITE,
dap->dp_ctrl_stat | SSTICKYORUN, NULL, 0);
retval = ERROR_JTAG_DEVICE_ERROR;
}
}
/* we're done with this command, release it */
dap_cmd_release(dap, tmp);
if (retval != ERROR_OK)
goto done;
}
/* make el->invalue point to the default invalue
* so that we can safely retry it without clobbering
* the result we just recovered */
el->invalue = el->invalue_buf;
}
}
/* move all remaining transactions over to the replay list */
list_for_each_entry_safe_from(el, tmp, &dap->cmd_journal, lh) {
log_dap_cmd(dap, "REP", el);
list_move_tail(&el->lh, &replay_list);
}
/* we're done with the journal, flush it */
flush_journal(dap, &dap->cmd_journal);
/* check for overrun condition in the last batch of transactions */
if (found_wait) {
LOG_INFO("DAP transaction stalled (WAIT) - slowing down and resending");
/* clear the sticky overrun condition */
retval = adi_jtag_scan_inout_check_u32(dap, JTAG_DP_DPACC,
DP_CTRL_STAT, DPAP_WRITE,
dap->dp_ctrl_stat | SSTICKYORUN, NULL, 0);
if (retval != ERROR_OK)
goto done;
/* restore SELECT register first */
if (!list_empty(&replay_list)) {
el = list_first_entry(&replay_list, struct dap_cmd, lh);
uint8_t out_value_buf[4];
buf_set_u32(out_value_buf, 0, 32, (uint32_t)(el->dp_select));
tmp = dap_cmd_new(dap, JTAG_DP_DPACC,
DP_SELECT, DPAP_WRITE, out_value_buf, NULL, 0);
if (!tmp) {
retval = ERROR_JTAG_DEVICE_ERROR;
goto done;
}
list_add(&tmp->lh, &replay_list);
/* TODO: ADIv6 DP SELECT1 handling */
dap->select_valid = false;
}
list_for_each_entry_safe(el, tmp, &replay_list, lh) {
time_now = timeval_ms();
do {
retval = adi_jtag_dp_scan_cmd_sync(dap, el, NULL);
if (retval != ERROR_OK)
break;
log_dap_cmd(dap, "REC", el);
if (el->ack == JTAG_ACK_OK_FAULT || (is_adiv6(dap) && el->ack == JTAG_ACK_OK)) {
if (el->invalue != el->invalue_buf) {
uint32_t invalue = le_to_h_u32(el->invalue);
memcpy(el->invalue, &invalue, sizeof(uint32_t));
}
break;
}
if (el->ack != JTAG_ACK_WAIT) {
LOG_ERROR("Invalid ACK (%1x) in DAP response", el->ack);
log_dap_cmd(dap, "ERR", el);
retval = ERROR_JTAG_DEVICE_ERROR;
break;
}
LOG_DEBUG("DAP transaction stalled during replay (WAIT) - resending");
/* clear the sticky overrun condition */
retval = adi_jtag_scan_inout_check_u32(dap, JTAG_DP_DPACC,
DP_CTRL_STAT, DPAP_WRITE,
dap->dp_ctrl_stat | SSTICKYORUN, NULL, 0);
if (retval != ERROR_OK)
break;
} while (timeval_ms() - time_now < 1000);
if (retval == ERROR_OK) {
if (el->ack == JTAG_ACK_WAIT) {
LOG_ERROR("Timeout during WAIT recovery");
dap->select_valid = false;
dap->select1_valid = false;
/* Keep dap->select unchanged, the same AP and AP bank
* is likely going to be used further */
jtag_ap_q_abort(dap, NULL);
/* clear the sticky overrun condition */
adi_jtag_scan_inout_check_u32(dap, JTAG_DP_DPACC,
DP_CTRL_STAT, DPAP_WRITE,
dap->dp_ctrl_stat | SSTICKYORUN, NULL, 0);
retval = ERROR_JTAG_DEVICE_ERROR;
break;
}
} else
break;
}
}
done:
flush_journal(dap, &replay_list);
flush_journal(dap, &dap->cmd_journal);
return retval;
}
static int jtagdp_transaction_endcheck(struct adiv5_dap *dap)
{
int retval;
uint32_t ctrlstat, pwrmask;
/* too expensive to call keep_alive() here */
/* Post CTRL/STAT read; discard any previous posted read value
* but collect its ACK status.
*/
retval = adi_jtag_scan_inout_check_u32(dap, JTAG_DP_DPACC,
DP_CTRL_STAT, DPAP_READ, 0, &ctrlstat, 0);
if (retval != ERROR_OK)
goto done;
/* REVISIT also STICKYCMP, for pushed comparisons (nyet used) */
/* Check for STICKYERR */
if (ctrlstat & SSTICKYERR) {
LOG_DEBUG("jtag-dp: CTRL/STAT 0x%" PRIx32, ctrlstat);
/* Check power to debug regions */
pwrmask = CDBGPWRUPREQ | CDBGPWRUPACK | CSYSPWRUPREQ;
if (!dap->ignore_syspwrupack)
pwrmask |= CSYSPWRUPACK;
if ((ctrlstat & pwrmask) != pwrmask) {
LOG_ERROR("Debug regions are unpowered, an unexpected reset might have happened");
dap->do_reconnect = true;
}
if (ctrlstat & SSTICKYERR)
LOG_ERROR("JTAG-DP STICKY ERROR");
if (ctrlstat & SSTICKYORUN)
LOG_DEBUG("JTAG-DP STICKY OVERRUN");
/* Clear Sticky Error and Sticky Overrun Bits */
retval = adi_jtag_scan_inout_check_u32(dap, JTAG_DP_DPACC,
DP_CTRL_STAT, DPAP_WRITE,
dap->dp_ctrl_stat | SSTICKYERR | SSTICKYORUN, NULL, 0);
if (retval != ERROR_OK)
goto done;
retval = ERROR_JTAG_DEVICE_ERROR;
}
done:
flush_journal(dap, &dap->cmd_journal);
return retval;
}
/*--------------------------------------------------------------------------*/
static int jtag_connect(struct adiv5_dap *dap)
{
dap->do_reconnect = false;
return dap_dp_init(dap);
}
static int jtag_check_reconnect(struct adiv5_dap *dap)
{
if (dap->do_reconnect)
return jtag_connect(dap);
return ERROR_OK;
}
static int jtag_send_sequence(struct adiv5_dap *dap, enum swd_special_seq seq)
{
int retval;
switch (seq) {
case JTAG_TO_SWD:
retval = jtag_add_tms_seq(swd_seq_jtag_to_swd_len,
swd_seq_jtag_to_swd, TAP_INVALID);
break;
case SWD_TO_JTAG:
retval = jtag_add_tms_seq(swd_seq_swd_to_jtag_len,
swd_seq_swd_to_jtag, TAP_RESET);
break;
default:
LOG_ERROR("Sequence %d not supported", seq);
return ERROR_FAIL;
}
if (retval == ERROR_OK)
retval = jtag_execute_queue();
return retval;
}
static int jtag_dp_q_read(struct adiv5_dap *dap, unsigned reg,
uint32_t *data)
{
int retval = jtag_limit_queue_size(dap);
if (retval != ERROR_OK)
return retval;
retval = adi_jtag_dp_scan_u32(dap, JTAG_DP_DPACC, reg,
DPAP_READ, 0, dap->last_read, 0, NULL);
dap->last_read = data;
return retval;
}
static int jtag_dp_q_write(struct adiv5_dap *dap, unsigned reg,
uint32_t data)
{
int retval = jtag_limit_queue_size(dap);
if (retval != ERROR_OK)
return retval;
retval = adi_jtag_dp_scan_u32(dap, JTAG_DP_DPACC,
reg, DPAP_WRITE, data, dap->last_read, 0, NULL);
dap->last_read = NULL;
return retval;
}
/** Select the AP register bank */
static int jtag_ap_q_bankselect(struct adiv5_ap *ap, unsigned reg)
{
int retval;
struct adiv5_dap *dap = ap->dap;
uint64_t sel;
if (is_adiv6(dap))
sel = ap->ap_num | (reg & 0x00000FF0);
else
sel = (ap->ap_num << 24) | (reg & ADIV5_DP_SELECT_APBANK);
uint64_t sel_diff = (sel ^ dap->select) & SELECT_AP_MASK;
bool set_select = !dap->select_valid || (sel_diff & 0xffffffffull);
bool set_select1 = is_adiv6(dap) && dap->asize > 32
&& (!dap->select1_valid
|| sel_diff & (0xffffffffull << 32));
if (set_select && set_select1) {
/* Prepare DP bank for DP_SELECT1 now to save one write */
sel |= (DP_SELECT1 >> 4) & DP_SELECT_DPBANK;
} else {
/* Use the DP part of dap->select regardless of dap->select_valid:
* if !dap->select_valid
* dap->select contains a speculative value likely going to be used
* in the following swd_queue_dp_bankselect().
* Moreover dap->select_valid should never be false here as a DP bank
* is always selected before selecting an AP bank */
sel |= dap->select & DP_SELECT_DPBANK;
}
if (set_select) {
LOG_DEBUG_IO("AP BANK SELECT: %" PRIx32, (uint32_t)sel);
retval = jtag_dp_q_write(dap, DP_SELECT, (uint32_t)sel);
if (retval != ERROR_OK) {
dap->select_valid = false;
return retval;
}
}
if (set_select1) {
LOG_DEBUG_IO("AP BANK SELECT1: %" PRIx32, (uint32_t)(sel >> 32));
retval = jtag_dp_q_write(dap, DP_SELECT1, (uint32_t)(sel >> 32));
if (retval != ERROR_OK) {
dap->select1_valid = false;
return retval;
}
}
dap->select = sel;
return ERROR_OK;
}
static int jtag_ap_q_read(struct adiv5_ap *ap, unsigned reg,
uint32_t *data)
{
int retval = jtag_limit_queue_size(ap->dap);
if (retval != ERROR_OK)
return retval;
retval = jtag_check_reconnect(ap->dap);
if (retval != ERROR_OK)
return retval;
retval = jtag_ap_q_bankselect(ap, reg);
if (retval != ERROR_OK)
return retval;
retval = adi_jtag_dp_scan_u32(ap->dap, JTAG_DP_APACC, reg,
DPAP_READ, 0, ap->dap->last_read, ap->memaccess_tck, NULL);
ap->dap->last_read = data;
return retval;
}
static int jtag_ap_q_write(struct adiv5_ap *ap, unsigned reg,
uint32_t data)
{
int retval = jtag_limit_queue_size(ap->dap);
if (retval != ERROR_OK)
return retval;
retval = jtag_check_reconnect(ap->dap);
if (retval != ERROR_OK)
return retval;
retval = jtag_ap_q_bankselect(ap, reg);
if (retval != ERROR_OK)
return retval;
retval = adi_jtag_dp_scan_u32(ap->dap, JTAG_DP_APACC, reg,
DPAP_WRITE, data, ap->dap->last_read, ap->memaccess_tck, NULL);
ap->dap->last_read = NULL;
return retval;
}
static int jtag_ap_q_abort(struct adiv5_dap *dap, uint8_t *ack)
{
/* for JTAG, this is the only valid ABORT register operation */
int retval = adi_jtag_dp_scan_u32(dap, JTAG_DP_ABORT,
0, DPAP_WRITE, 1, NULL, 0, NULL);
if (retval != ERROR_OK)
return retval;
return jtag_execute_queue();
}
static int jtag_dp_run(struct adiv5_dap *dap)
{
int retval;
int retval2 = ERROR_OK;
retval = adi_jtag_finish_read(dap);
if (retval != ERROR_OK)
goto done;
retval2 = jtagdp_overrun_check(dap);
retval = jtagdp_transaction_endcheck(dap);
done:
return (retval2 != ERROR_OK) ? retval2 : retval;
}
static int jtag_dp_sync(struct adiv5_dap *dap)
{
return jtagdp_overrun_check(dap);
}
/* FIXME don't export ... just initialize as
* part of DAP setup
*/
const struct dap_ops jtag_dp_ops = {
.connect = jtag_connect,
.send_sequence = jtag_send_sequence,
.queue_dp_read = jtag_dp_q_read,
.queue_dp_write = jtag_dp_q_write,
.queue_ap_read = jtag_ap_q_read,
.queue_ap_write = jtag_ap_q_write,
.queue_ap_abort = jtag_ap_q_abort,
.run = jtag_dp_run,
.sync = jtag_dp_sync,
.quit = jtag_quit,
};
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