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riscv-openocd/src/jtag/jlink.c

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/***************************************************************************
* Copyright (C) 2007 by Juergen Stuber <juergen@jstuber.net> *
* based on Dominic Rath's and Benedikt Sauter's usbprog.c *
* *
* Copyright (C) 2008 by Spencer Oliver *
* spen@spen-soft.co.uk *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#define INCLUDE_JTAG_INTERFACE_H
#include "jtag.h"
#include <usb.h>
#define VID 0x1366
#define PID 0x0101
#define JLINK_WRITE_ENDPOINT 0x02
#define JLINK_READ_ENDPOINT 0x81
static unsigned int jlink_write_ep = JLINK_WRITE_ENDPOINT;
static unsigned int jlink_read_ep = JLINK_READ_ENDPOINT;
static unsigned int jlink_hw_jtag_version = 2;
#define JLINK_USB_TIMEOUT 1000
// See Section 1.3.2 of the Segger JLink USB protocol manual
/* 2048 is the max value we can use here */
//#define JLINK_TAP_BUFFER_SIZE 2048
#define JLINK_TAP_BUFFER_SIZE 256
//#define JLINK_TAP_BUFFER_SIZE 384
#define JLINK_IN_BUFFER_SIZE 2048
#define JLINK_OUT_BUFFER_SIZE 2*2048+4
#define JLINK_EMU_RESULT_BUFFER_SIZE 64
/* Global USB buffers */
static u8 usb_in_buffer[JLINK_IN_BUFFER_SIZE];
static u8 usb_out_buffer[JLINK_OUT_BUFFER_SIZE];
static u8 usb_emu_result_buffer[JLINK_EMU_RESULT_BUFFER_SIZE];
/* Constants for JLink command */
#define EMU_CMD_VERSION 0x01
#define EMU_CMD_SET_SPEED 0x05
#define EMU_CMD_GET_STATE 0x07
#define EMU_CMD_HW_CLOCK 0xc8
#define EMU_CMD_HW_TMS0 0xc9
#define EMU_CMD_HW_TMS1 0xca
#define EMU_CMD_HW_JTAG2 0xce
#define EMU_CMD_HW_JTAG3 0xcf
#define EMU_CMD_GET_MAX_MEM_BLOCK 0xd4
#define EMU_CMD_HW_RESET0 0xdc
#define EMU_CMD_HW_RESET1 0xdd
#define EMU_CMD_HW_TRST0 0xde
#define EMU_CMD_HW_TRST1 0xdf
#define EMU_CMD_GET_CAPS 0xe8
#define EMU_CMD_GET_HW_VERSION 0xf0
/* bits return from EMU_CMD_GET_CAPS */
#define EMU_CAP_GET_HW_VERSION 1
#define EMU_CAP_GET_MAX_BLOCK_SIZE 11
/* max speed 12MHz v5.0 jlink */
#define JLINK_MAX_SPEED 12000
/* External interface functions */
static int jlink_execute_queue(void);
static int jlink_speed(int speed);
static int jlink_speed_div(int speed, int* khz);
static int jlink_khz(int khz, int *jtag_speed);
static int jlink_register_commands(struct command_context_s *cmd_ctx);
static int jlink_init(void);
static int jlink_quit(void);
/* CLI command handler functions */
static int jlink_handle_jlink_info_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
static int jlink_handle_jlink_hw_jtag_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
/* Queue command functions */
static void jlink_end_state(tap_state_t state);
static void jlink_state_move(void);
static void jlink_path_move(int num_states, tap_state_t *path);
static void jlink_runtest(int num_cycles);
static void jlink_scan(bool ir_scan, enum scan_type type, u8 *buffer, int scan_size, scan_command_t *command);
static void jlink_reset(int trst, int srst);
static void jlink_simple_command(u8 command);
static int jlink_get_status(void);
/* J-Link tap buffer functions */
static void jlink_tap_init(void);
static int jlink_tap_execute(void);
static void jlink_tap_ensure_space(int scans, int bits);
static void jlink_tap_append_step(int tms, int tdi);
static void jlink_tap_append_scan(int length, u8 *buffer, scan_command_t *command);
/* Jlink lowlevel functions */
typedef struct jlink_jtag
{
struct usb_dev_handle* usb_handle;
} jlink_jtag_t;
static jlink_jtag_t *jlink_usb_open(void);
static void jlink_usb_close(jlink_jtag_t *jlink_jtag);
static int jlink_usb_message(jlink_jtag_t *jlink_jtag, int out_length, int in_length);
static int jlink_usb_write(jlink_jtag_t *jlink_jtag, int out_length);
static int jlink_usb_read(jlink_jtag_t *jlink_jtag, int expected_size);
static int jlink_usb_read_emu_result(jlink_jtag_t *jlink_jtag);
/* helper functions */
static int jlink_get_version_info(void);
#ifdef _DEBUG_USB_COMMS_
static void jlink_debug_buffer(u8 *buffer, int length);
#endif
static enum tap_state jlink_last_state = TAP_RESET;
static jlink_jtag_t* jlink_jtag_handle;
/***************************************************************************/
/* External interface implementation */
jtag_interface_t jlink_interface =
{
.name = "jlink",
.execute_queue = jlink_execute_queue,
.speed = jlink_speed,
.speed_div = jlink_speed_div,
.khz = jlink_khz,
.register_commands = jlink_register_commands,
.init = jlink_init,
.quit = jlink_quit
};
static void jlink_execute_runtest(jtag_command_t *cmd)
{
DEBUG_JTAG_IO("runtest %i cycles, end in %i",
cmd->cmd.runtest->num_cycles,
cmd->cmd.runtest->end_state);
jlink_end_state(cmd->cmd.runtest->end_state);
jlink_runtest(cmd->cmd.runtest->num_cycles);
}
static void jlink_execute_statemove(jtag_command_t *cmd)
{
DEBUG_JTAG_IO("statemove end in %i", cmd->cmd.statemove->end_state);
jlink_end_state(cmd->cmd.statemove->end_state);
jlink_state_move();
}
static void jlink_execute_pathmove(jtag_command_t *cmd)
{
DEBUG_JTAG_IO("pathmove: %i states, end in %i",
cmd->cmd.pathmove->num_states,
cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]);
jlink_path_move(cmd->cmd.pathmove->num_states,
cmd->cmd.pathmove->path);
}
static void jlink_execute_scan(jtag_command_t *cmd)
{
int scan_size;
enum scan_type type;
u8 *buffer;
DEBUG_JTAG_IO("scan end in %s", tap_state_name(cmd->cmd.scan->end_state));
jlink_end_state(cmd->cmd.scan->end_state);
scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
DEBUG_JTAG_IO("scan input, length = %d", scan_size);
#ifdef _DEBUG_USB_COMMS_
jlink_debug_buffer(buffer, (scan_size + 7) / 8);
#endif
type = jtag_scan_type(cmd->cmd.scan);
jlink_scan(cmd->cmd.scan->ir_scan,
type, buffer, scan_size, cmd->cmd.scan);
}
static void jlink_execute_reset(jtag_command_t *cmd)
{
DEBUG_JTAG_IO("reset trst: %i srst %i",
cmd->cmd.reset->trst, cmd->cmd.reset->srst);
jlink_tap_execute();
jlink_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
jlink_tap_execute();
}
static void jlink_execute_sleep(jtag_command_t *cmd)
{
DEBUG_JTAG_IO("sleep %i", cmd->cmd.sleep->us);
jlink_tap_execute();
jtag_sleep(cmd->cmd.sleep->us);
}
static void jlink_execute_command(jtag_command_t *cmd)
{
switch (cmd->type)
{
case JTAG_RUNTEST: jlink_execute_runtest(cmd); break;
case JTAG_STATEMOVE: jlink_execute_statemove(cmd); break;
case JTAG_PATHMOVE: jlink_execute_pathmove(cmd); break;
case JTAG_SCAN: jlink_execute_scan(cmd); break;
case JTAG_RESET: jlink_execute_reset(cmd); break;
case JTAG_SLEEP: jlink_execute_sleep(cmd); break;
default:
LOG_ERROR("BUG: unknown JTAG command type encountered");
exit(-1);
}
}
static int jlink_execute_queue(void)
{
jtag_command_t *cmd = jtag_command_queue;
while (cmd != NULL)
{
jlink_execute_command(cmd);
cmd = cmd->next;
}
return jlink_tap_execute();
}
/* Sets speed in kHz. */
static int jlink_speed(int speed)
{
int result;
if (speed > JLINK_MAX_SPEED)
{
LOG_INFO("Ignoring speed request: %dkHz exceeds %dkHz maximum",
speed, JLINK_MAX_SPEED);
return ERROR_OK;
}
/* check for RTCK setting */
if (speed == 0)
speed = -1;
usb_out_buffer[0] = EMU_CMD_SET_SPEED;
usb_out_buffer[1] = (speed >> 0) & 0xff;
usb_out_buffer[2] = (speed >> 8) & 0xff;
result = jlink_usb_write(jlink_jtag_handle, 3);
if (result != 3)
{
LOG_ERROR("J-Link setting speed failed (%d)", result);
return ERROR_JTAG_DEVICE_ERROR;
}
return ERROR_OK;
}
static int jlink_speed_div(int speed, int* khz)
{
*khz = speed;
return ERROR_OK;
}
static int jlink_khz(int khz, int *jtag_speed)
{
*jtag_speed = khz;
return ERROR_OK;
}
static int jlink_register_commands(struct command_context_s *cmd_ctx)
{
register_command(cmd_ctx, NULL, "jlink_info",
&jlink_handle_jlink_info_command, COMMAND_EXEC,
"query jlink info");
register_command(cmd_ctx, NULL, "jlink_hw_jtag",
&jlink_handle_jlink_hw_jtag_command, COMMAND_EXEC,
"set/get jlink hw jtag command version [2|3]");
return ERROR_OK;
}
static int jlink_init(void)
{
int check_cnt;
jlink_jtag_handle = jlink_usb_open();
if (jlink_jtag_handle == 0)
{
LOG_ERROR("Cannot find jlink Interface! Please check connection and permissions.");
return ERROR_JTAG_INIT_FAILED;
}
jlink_hw_jtag_version = 2;
check_cnt = 0;
while (check_cnt < 3)
{
if (jlink_get_version_info() == ERROR_OK)
{
/* attempt to get status */
jlink_get_status();
break;
}
check_cnt++;
}
if (check_cnt == 3)
{
LOG_INFO("J-Link initial read failed, don't worry");
}
LOG_INFO("J-Link JTAG Interface ready");
jlink_reset(0, 0);
jtag_sleep(3000);
jlink_tap_init();
jlink_speed(jtag_speed);
return ERROR_OK;
}
static int jlink_quit(void)
{
jlink_usb_close(jlink_jtag_handle);
return ERROR_OK;
}
/***************************************************************************/
/* Queue command implementations */
static void jlink_end_state(tap_state_t state)
{
if (tap_is_state_stable(state))
{
tap_set_end_state(state);
}
else
{
LOG_ERROR("BUG: %i is not a valid end state", state);
exit(-1);
}
}
/* Goes to the end state. */
static void jlink_state_move(void)
{
int i;
int tms = 0;
u8 tms_scan = tap_get_tms_path(tap_get_state(), tap_get_end_state());
u8 tms_scan_bits = tap_get_tms_path_len(tap_get_state(), tap_get_end_state());
for (i = 0; i < tms_scan_bits; i++)
{
tms = (tms_scan >> i) & 1;
jlink_tap_append_step(tms, 0);
}
tap_set_state(tap_get_end_state());
}
static void jlink_path_move(int num_states, tap_state_t *path)
{
int i;
for (i = 0; i < num_states; i++)
{
if (path[i] == tap_state_transition(tap_get_state(), false))
{
jlink_tap_append_step(0, 0);
}
else if (path[i] == tap_state_transition(tap_get_state(), true))
{
jlink_tap_append_step(1, 0);
}
else
{
LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(tap_get_state()), tap_state_name(path[i]));
exit(-1);
}
tap_set_state(path[i]);
}
tap_set_end_state(tap_get_state());
}
static void jlink_runtest(int num_cycles)
{
int i;
tap_state_t saved_end_state = tap_get_end_state();
jlink_tap_ensure_space(1,num_cycles + 16);
/* only do a state_move when we're not already in IDLE */
if (tap_get_state() != TAP_IDLE)
{
jlink_end_state(TAP_IDLE);
jlink_state_move();
// num_cycles--;
}
/* execute num_cycles */
for (i = 0; i < num_cycles; i++)
{
jlink_tap_append_step(0, 0);
}
/* finish in end_state */
jlink_end_state(saved_end_state);
if (tap_get_state() != tap_get_end_state())
{
jlink_state_move();
}
}
static void jlink_scan(bool ir_scan, enum scan_type type, u8 *buffer, int scan_size, scan_command_t *command)
{
tap_state_t saved_end_state;
jlink_tap_ensure_space(1, scan_size + 16);
saved_end_state = tap_get_end_state();
/* Move to appropriate scan state */
jlink_end_state(ir_scan ? TAP_IRSHIFT : TAP_DRSHIFT);
/* Only move if we're not already there */
if (tap_get_state() != tap_get_end_state())
jlink_state_move();
jlink_end_state(saved_end_state);
/* Scan */
jlink_tap_append_scan(scan_size, buffer, command);
/* We are in Exit1, go to Pause */
jlink_tap_append_step(0, 0);
tap_set_state(ir_scan ? TAP_IRPAUSE : TAP_DRPAUSE);
if (tap_get_state() != tap_get_end_state())
{
jlink_state_move();
}
}
static void jlink_reset(int trst, int srst)
{
LOG_DEBUG("trst: %i, srst: %i", trst, srst);
/* Signals are active low */
if (srst == 0)
{
jlink_simple_command(EMU_CMD_HW_RESET1);
}
if (srst == 1)
{
jlink_simple_command(EMU_CMD_HW_RESET0);
}
if (trst == 1)
{
jlink_simple_command(EMU_CMD_HW_TRST0);
}
if (trst == 0)
{
jlink_simple_command(EMU_CMD_HW_TRST1);
jtag_sleep(5000);
jlink_end_state(TAP_RESET);
jlink_state_move();
}
}
static void jlink_simple_command(u8 command)
{
int result;
DEBUG_JTAG_IO("0x%02x", command);
usb_out_buffer[0] = command;
result = jlink_usb_write(jlink_jtag_handle, 1);
if (result != 1)
{
LOG_ERROR("J-Link command 0x%02x failed (%d)", command, result);
}
}
static int jlink_get_status(void)
{
int result;
jlink_simple_command(EMU_CMD_GET_STATE);
result = jlink_usb_read(jlink_jtag_handle, 8);
if (result != 8)
{
LOG_ERROR("J-Link command EMU_CMD_GET_STATE failed (%d)\n", result);
return ERROR_JTAG_DEVICE_ERROR;
}
int vref = usb_in_buffer[0] + (usb_in_buffer[1] << 8);
LOG_INFO("Vref = %d.%d TCK = %d TDI = %d TDO = %d TMS = %d SRST = %d TRST = %d\n", \
vref / 1000, vref % 1000, \
usb_in_buffer[2], usb_in_buffer[3], usb_in_buffer[4], \
usb_in_buffer[5], usb_in_buffer[6], usb_in_buffer[7]);
if (vref < 1500)
LOG_ERROR("Vref too low. Check Target Power\n");
return ERROR_OK;
}
static int jlink_get_version_info(void)
{
int result;
int len;
u32 jlink_caps, jlink_max_size;
/* query hardware version */
jlink_simple_command(EMU_CMD_VERSION);
result = jlink_usb_read(jlink_jtag_handle, 2);
if (2 != result)
{
LOG_ERROR("J-Link command EMU_CMD_VERSION failed (%d)\n", result);
return ERROR_JTAG_DEVICE_ERROR;
}
len = buf_get_u32(usb_in_buffer, 0, 16);
if (len > JLINK_IN_BUFFER_SIZE)
{
LOG_ERROR("J-Link command EMU_CMD_VERSION impossible return length 0x%0x", len);
len = JLINK_IN_BUFFER_SIZE;
}
result = jlink_usb_read(jlink_jtag_handle, len);
if (result != len)
{
LOG_ERROR("J-Link command EMU_CMD_VERSION failed (%d)\n", result);
return ERROR_JTAG_DEVICE_ERROR;
}
usb_in_buffer[result] = 0;
LOG_INFO("%s", (char *)usb_in_buffer);
/* query hardware capabilities */
jlink_simple_command(EMU_CMD_GET_CAPS);
result = jlink_usb_read(jlink_jtag_handle, 4);
if (4 != result)
{
LOG_ERROR("J-Link command EMU_CMD_GET_CAPS failed (%d)\n", result);
return ERROR_JTAG_DEVICE_ERROR;
}
jlink_caps = buf_get_u32(usb_in_buffer, 0, 32);
LOG_INFO("JLink caps 0x%x", jlink_caps);
if (jlink_caps & (1 << EMU_CAP_GET_HW_VERSION))
{
/* query hardware version */
jlink_simple_command(EMU_CMD_GET_HW_VERSION);
result = jlink_usb_read(jlink_jtag_handle, 4);
if (4 != result)
{
LOG_ERROR("J-Link command EMU_CMD_GET_HW_VERSION failed (%d)\n", result);
return ERROR_JTAG_DEVICE_ERROR;
}
u32 jlink_hw_version = buf_get_u32(usb_in_buffer, 0, 32);
u32 major_revision = (jlink_hw_version / 10000) % 100;
if (major_revision >= 5)
jlink_hw_jtag_version = 3;
LOG_INFO("JLink hw version %i", jlink_hw_version);
}
if (jlink_caps & (1 << EMU_CAP_GET_MAX_BLOCK_SIZE))
{
/* query hardware maximum memory block */
jlink_simple_command(EMU_CMD_GET_MAX_MEM_BLOCK);
result = jlink_usb_read(jlink_jtag_handle, 4);
if (4 != result)
{
LOG_ERROR("J-Link command EMU_CMD_GET_MAX_MEM_BLOCK failed (%d)\n", result);
return ERROR_JTAG_DEVICE_ERROR;
}
jlink_max_size = buf_get_u32(usb_in_buffer, 0, 32);
LOG_INFO("JLink max mem block %i", jlink_max_size);
}
return ERROR_OK;
}
static int jlink_handle_jlink_info_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
{
if (jlink_get_version_info() == ERROR_OK)
{
/* attempt to get status */
jlink_get_status();
}
return ERROR_OK;
}
static int jlink_handle_jlink_hw_jtag_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
{
switch (argc) {
case 0:
command_print(cmd_ctx, "jlink hw jtag %i", jlink_hw_jtag_version);
break;
case 1: {
int request_version = atoi(args[0]);
switch (request_version) {
case 2: case 3:
jlink_hw_jtag_version = request_version;
break;
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
break;
}
default:
return ERROR_COMMAND_SYNTAX_ERROR;
}
return ERROR_OK;
}
/***************************************************************************/
/* J-Link tap functions */
static unsigned tap_length=0;
static u8 tms_buffer[JLINK_TAP_BUFFER_SIZE];
static u8 tdi_buffer[JLINK_TAP_BUFFER_SIZE];
static u8 tdo_buffer[JLINK_TAP_BUFFER_SIZE];
typedef struct
{
int first; /* First bit position in tdo_buffer to read */
int length; /* Number of bits to read */
scan_command_t *command; /* Corresponding scan command */
u8 *buffer;
} pending_scan_result_t;
#define MAX_PENDING_SCAN_RESULTS 256
static int pending_scan_results_length;
static pending_scan_result_t pending_scan_results_buffer[MAX_PENDING_SCAN_RESULTS];
static void jlink_tap_init(void)
{
tap_length = 0;
pending_scan_results_length = 0;
}
static void jlink_tap_ensure_space(int scans, int bits)
{
int available_scans = MAX_PENDING_SCAN_RESULTS - pending_scan_results_length;
int available_bits = JLINK_TAP_BUFFER_SIZE * 8 - tap_length - 32;
if (scans > available_scans || bits > available_bits)
{
jlink_tap_execute();
}
}
static void jlink_tap_append_step(int tms, int tdi)
{
int index = tap_length / 8;
if (index >= JLINK_TAP_BUFFER_SIZE)
{
LOG_ERROR("jlink_tap_append_step: overflow");
*(u32 *)0xFFFFFFFF = 0;
exit(-1);
}
int bit_index = tap_length % 8;
u8 bit = 1 << bit_index;
// we do not pad TMS, so be sure to initialize all bits
if (0 == bit_index)
{
tms_buffer[index] = tdi_buffer[index] = 0;
}
if (tms)
tms_buffer[index] |= bit;
else
tms_buffer[index] &= ~bit;
if (tdi)
tdi_buffer[index] |= bit;
else
tdi_buffer[index] &= ~bit;
tap_length++;
}
static void jlink_tap_append_scan(int length, u8 *buffer, scan_command_t *command)
{
pending_scan_result_t *pending_scan_result =
&pending_scan_results_buffer[pending_scan_results_length];
int i;
pending_scan_result->first = tap_length;
pending_scan_result->length = length;
pending_scan_result->command = command;
pending_scan_result->buffer = buffer;
for (i = 0; i < length; i++)
{
int tms = (i < (length - 1)) ? 0 : 1;
int tdi = (buffer[i / 8] & (1 << (i % 8)))!=0;
jlink_tap_append_step(tms, tdi);
}
pending_scan_results_length++;
}
/* Pad and send a tap sequence to the device, and receive the answer.
* For the purpose of padding we assume that we are in idle or pause state. */
static int jlink_tap_execute(void)
{
int byte_length;
int i;
int result;
if (!tap_length)
return ERROR_OK;
/* JLink returns an extra NULL in packet when size of in message is a multiple of 64, creates problems with usb comms */
/* WARNING This will interfere with tap state counting */
while ((TAP_SCAN_BYTES(tap_length)%64)==0)
{
jlink_tap_append_step((tap_get_state() == TAP_RESET)?1:0, 0);
}
// number of full bytes (plus one if some would be left over)
byte_length = TAP_SCAN_BYTES(tap_length);
bool use_jtag3 = jlink_hw_jtag_version >= 3;
usb_out_buffer[0] = use_jtag3 ? EMU_CMD_HW_JTAG3 : EMU_CMD_HW_JTAG2;
usb_out_buffer[1] = 0;
usb_out_buffer[2] = (tap_length >> 0) & 0xff;
usb_out_buffer[3] = (tap_length >> 8) & 0xff;
memcpy(usb_out_buffer + 4, tms_buffer, byte_length);
memcpy(usb_out_buffer + 4 + byte_length, tdi_buffer, byte_length);
jlink_last_state = jtag_debug_state_machine(tms_buffer, tdi_buffer,
tap_length, jlink_last_state);
result = jlink_usb_message(jlink_jtag_handle, 4 + 2 * byte_length, byte_length);
if (result != byte_length)
{
LOG_ERROR("jlink_tap_execute, wrong result %d (expected %d)", result, byte_length);
jlink_tap_init();
return ERROR_JTAG_QUEUE_FAILED;
}
memcpy(tdo_buffer, usb_in_buffer, byte_length);
for (i = 0; i < pending_scan_results_length; i++)
{
pending_scan_result_t *pending_scan_result = &pending_scan_results_buffer[i];
u8 *buffer = pending_scan_result->buffer;
int length = pending_scan_result->length;
int first = pending_scan_result->first;
scan_command_t *command = pending_scan_result->command;
/* Copy to buffer */
buf_set_buf(tdo_buffer, first, buffer, 0, length);
DEBUG_JTAG_IO("pending scan result, length = %d", length);
#ifdef _DEBUG_USB_COMMS_
jlink_debug_buffer(buffer, TAP_SCAN_BYTES(length));
#endif
if (jtag_read_buffer(buffer, command) != ERROR_OK)
{
jlink_tap_init();
return ERROR_JTAG_QUEUE_FAILED;
}
if (pending_scan_result->buffer != NULL)
{
free(pending_scan_result->buffer);
}
}
jlink_tap_init();
return ERROR_OK;
}
/*****************************************************************************/
/* JLink USB low-level functions */
static jlink_jtag_t* jlink_usb_open()
{
struct usb_bus *busses;
struct usb_bus *bus;
struct usb_device *dev;
jlink_jtag_t *result;
result = (jlink_jtag_t*) malloc(sizeof(jlink_jtag_t));
usb_init();
usb_find_busses();
usb_find_devices();
busses = usb_get_busses();
/* find jlink_jtag device in usb bus */
for (bus = busses; bus; bus = bus->next)
{
for (dev = bus->devices; dev; dev = dev->next)
{
if ((dev->descriptor.idVendor == VID) && (dev->descriptor.idProduct == PID))
{
result->usb_handle = usb_open(dev);
/* usb_set_configuration required under win32 */
usb_set_configuration(result->usb_handle, dev->config[0].bConfigurationValue);
usb_claim_interface(result->usb_handle, 0);
#if 0
/*
* This makes problems under Mac OS X. And is not needed
* under Windows. Hopefully this will not break a linux build
*/
usb_set_altinterface(result->usb_handle, 0);
#endif
struct usb_interface *iface = dev->config->interface;
struct usb_interface_descriptor *desc = iface->altsetting;
for (int i = 0; i < desc->bNumEndpoints; i++)
{
u8 epnum = desc->endpoint[i].bEndpointAddress;
bool is_input = epnum & 0x80;
LOG_DEBUG("usb ep %s %02x", is_input ? "in" : "out", epnum);
if (is_input)
jlink_read_ep = epnum;
else
jlink_write_ep = epnum;
}
return result;
}
}
}
free(result);
return NULL;
}
static void jlink_usb_close(jlink_jtag_t *jlink_jtag)
{
usb_close(jlink_jtag->usb_handle);
free(jlink_jtag);
}
/* Send a message and receive the reply. */
static int jlink_usb_message(jlink_jtag_t *jlink_jtag, int out_length, int in_length)
{
int result;
result = jlink_usb_write(jlink_jtag, out_length);
if (result != out_length)
{
LOG_ERROR("usb_bulk_write failed (requested=%d, result=%d)",
out_length, result);
return ERROR_JTAG_DEVICE_ERROR;
}
result = jlink_usb_read(jlink_jtag, in_length);
if ((result != in_length) && (result != (in_length + 1)))
{
LOG_ERROR("usb_bulk_read failed (requested=%d, result=%d)",
in_length, result);
return ERROR_JTAG_DEVICE_ERROR;
}
if (jlink_hw_jtag_version < 3)
return result;
int result2 = ERROR_OK;
if (result == in_length)
{
/* Must read the result from the EMU too */
result2 = jlink_usb_read_emu_result(jlink_jtag);
if (1 != result2)
{
LOG_ERROR("jlink_usb_read_emu_result retried requested=1, result=%d, in_length=%i", result2,in_length);
/* Try again once, should only happen if (in_length%64==0) */
result2 = jlink_usb_read_emu_result(jlink_jtag);
if (1 != result2)
{
LOG_ERROR("jlink_usb_read_emu_result failed "
"(requested=1, result=%d)", result2);
return ERROR_JTAG_DEVICE_ERROR;
}
}
/* Check the result itself */
result2 = usb_emu_result_buffer[0];
}
else
{
/* Save the result, then remove it from return value */
result2 = usb_in_buffer[result--];
}
if (result2)
{
LOG_ERROR("jlink_usb_message failed with result=%d)", result2);
return ERROR_JTAG_DEVICE_ERROR;
}
return result;
}
/* calls the given usb_bulk_* function, allowing for the data to trickle in with some timeouts */
static int usb_bulk_with_retries(
int (*f)(usb_dev_handle *, int, char *, int, int),
usb_dev_handle *dev, int ep,
char *bytes, int size, int timeout)
{
int tries = 3, count = 0;
while (tries && (count < size))
{
int result = f(dev, ep, bytes + count, size - count, timeout);
if (result > 0)
count += result;
else if ((-ETIMEDOUT != result) || !--tries)
return result;
}
return count;
}
static int wrap_usb_bulk_write(usb_dev_handle *dev, int ep,
char *buff, int size, int timeout)
{
/* usb_bulk_write() takes const char *buff */
return usb_bulk_write(dev, ep, buff, size, timeout);
}
static inline int usb_bulk_write_ex(usb_dev_handle *dev, int ep,
char *bytes, int size, int timeout)
{
return usb_bulk_with_retries(&wrap_usb_bulk_write,
dev, ep, bytes, size, timeout);
}
static inline int usb_bulk_read_ex(usb_dev_handle *dev, int ep,
char *bytes, int size, int timeout)
{
return usb_bulk_with_retries(&usb_bulk_read,
dev, ep, bytes, size, timeout);
}
/* Write data from out_buffer to USB. */
static int jlink_usb_write(jlink_jtag_t *jlink_jtag, int out_length)
{
int result;
if (out_length > JLINK_OUT_BUFFER_SIZE)
{
LOG_ERROR("jlink_jtag_write illegal out_length=%d (max=%d)", out_length, JLINK_OUT_BUFFER_SIZE);
return -1;
}
result = usb_bulk_write_ex(jlink_jtag->usb_handle, jlink_write_ep,
(char *)usb_out_buffer, out_length, JLINK_USB_TIMEOUT);
DEBUG_JTAG_IO("jlink_usb_write, out_length = %d, result = %d", out_length, result);
#ifdef _DEBUG_USB_COMMS_
jlink_debug_buffer(usb_out_buffer, out_length);
#endif
return result;
}
/* Read data from USB into in_buffer. */
static int jlink_usb_read(jlink_jtag_t *jlink_jtag, int expected_size)
{
int result = usb_bulk_read_ex(jlink_jtag->usb_handle, jlink_read_ep,
(char *)usb_in_buffer, expected_size, JLINK_USB_TIMEOUT);
DEBUG_JTAG_IO("jlink_usb_read, result = %d", result);
#ifdef _DEBUG_USB_COMMS_
jlink_debug_buffer(usb_in_buffer, result);
#endif
return result;
}
/* Read the result from the previous EMU cmd into result_buffer. */
static int jlink_usb_read_emu_result(jlink_jtag_t *jlink_jtag)
{
int result = usb_bulk_read_ex(jlink_jtag->usb_handle, jlink_read_ep,
(char *)usb_emu_result_buffer, 1 /* JLINK_EMU_RESULT_BUFFER_SIZE */,
JLINK_USB_TIMEOUT);
DEBUG_JTAG_IO("jlink_usb_read_result, result = %d", result);
#ifdef _DEBUG_USB_COMMS_
jlink_debug_buffer(usb_emu_result_buffer, result);
#endif
return result;
}
#ifdef _DEBUG_USB_COMMS_
#define BYTES_PER_LINE 16
static void jlink_debug_buffer(u8 *buffer, int length)
{
char line[81];
char s[4];
int i;
int j;
for (i = 0; i < length; i += BYTES_PER_LINE)
{
snprintf(line, 5, "%04x", i);
for (j = i; j < i + BYTES_PER_LINE && j < length; j++)
{
snprintf(s, 4, " %02x", buffer[j]);
strcat(line, s);
}
LOG_DEBUG("%s", line);
}
}
#endif
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