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openocd/src/jtag/ftdi2232.c

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/***************************************************************************
* Copyright (C) 2004 by Dominic Rath *
* Dominic.Rath@gmx.de *
* *
* 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. *
***************************************************************************/
/* project specific includes */
#include "log.h"
#include "types.h"
#include "jtag.h"
#include "configuration.h"
#include "command.h"
/* system includes */
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <usb.h>
#include <ftdi.h>
#include <sys/time.h>
#include <time.h>
/* enable this to debug io latency
*/
#if 0
#define _DEBUG_USB_IO_
#endif
int ftdi2232_execute_queue(void);
int ftdi2232_speed(int speed);
int ftdi2232_register_commands(struct command_context_s *cmd_ctx);
int ftdi2232_init(void);
int ftdi2232_quit(void);
enum { FTDI2232_TRST = 0x10, FTDI2232_SRST = 0x40 };
static u8 discrete_output = 0x0 | FTDI2232_TRST | FTDI2232_SRST;
static struct ftdi_context ftdic;
static u8 *ftdi2232_buffer = NULL;
static int ftdi2232_buffer_size = 0;
static int ftdi2232_read_pointer = 0;
static int ftdi2232_expect_read = 0;
#define FTDI2232_BUFFER_SIZE 131072
#define BUFFER_ADD ftdi2232_buffer[ftdi2232_buffer_size++]
#define BUFFER_READ ftdi2232_buffer[ftdi2232_read_pointer++]
#define FTDI2232_SAVE_SIZE 1024
int ftdi2232_handle_vid_pid_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
static u16 ftdi2232_vid = 0x0403;
static u16 ftdi2232_pid = 0x6010;
jtag_interface_t ftdi2232_interface =
{
.name = "ftdi2232",
.execute_queue = ftdi2232_execute_queue,
.support_statemove = 1,
.speed = ftdi2232_speed,
.register_commands = ftdi2232_register_commands,
.init = ftdi2232_init,
.quit = ftdi2232_quit,
};
int ftdi2232_speed(int speed)
{
u8 buf[3];
buf[0] = 0x86; /* command "set divisor" */
buf[1] = speed & 0xff; /* valueL (0=6MHz, 1=3MHz, 2=1.5MHz, ...*/
buf[2] = (speed >> 8) & 0xff; /* valueH */
DEBUG("%2.2x %2.2x %2.2x", buf[0], buf[1], buf[2]);
ftdi_write_data(&ftdic, buf, 3);
return ERROR_OK;
}
int ftdi2232_register_commands(struct command_context_s *cmd_ctx)
{
register_command(cmd_ctx, NULL, "ftdi2232_vid_pid", ftdi2232_handle_vid_pid_command,
COMMAND_CONFIG, NULL);
return ERROR_OK;
}
void ftdi2232_end_state(state)
{
if (tap_move_map[state] != -1)
end_state = state;
else
{
ERROR("BUG: %i is not a valid end state", state);
exit(-1);
}
}
void ftdi2232_read_scan(enum scan_type type, u8* buffer, int scan_size)
{
int num_bytes = ((scan_size + 7) / 8);
int bits_left = scan_size;
int cur_byte = 0;
while(num_bytes-- > 1)
{
buffer[cur_byte] = BUFFER_READ;
cur_byte++;
bits_left -= 8;
}
buffer[cur_byte] = 0x0;
if (bits_left > 1)
{
buffer[cur_byte] = BUFFER_READ >> 1;
}
buffer[cur_byte] = (buffer[cur_byte] | ((BUFFER_READ & 0x02) << 6)) >> (8 - bits_left);
}
void ftdi2232_debug_dump_buffer(void)
{
int i;
for (i = 0; i < ftdi2232_buffer_size; i++)
{
printf("%2.2x ", ftdi2232_buffer[i]);
if (i % 16 == 15)
printf("\n");
}
printf("\n");
fflush(stdout);
}
int ftdi2232_send_and_recv(jtag_command_t *first, jtag_command_t *last)
{
jtag_command_t *cmd;
u8 *buffer;
int scan_size;
enum scan_type type;
int retval;
BUFFER_ADD = 0x87; /* send immediate command */
if (ftdi2232_buffer_size > FTDI2232_SAVE_SIZE)
{
ERROR("BUG: ftdi2232_buffer grew beyond %i byte (%i) - this is going to fail", FTDI2232_SAVE_SIZE, ftdi2232_buffer_size);
}
#ifdef _DEBUG_USB_IO_
DEBUG("write buffer (size %i):", ftdi2232_buffer_size);
ftdi2232_debug_dump_buffer();
#endif
if ((retval = ftdi_write_data(&ftdic, ftdi2232_buffer, ftdi2232_buffer_size)) < 0)
{
ERROR("ftdi_write_data returned %i", retval);
exit(-1);
}
if (ftdi2232_expect_read)
{
int timeout = 100;
ftdi2232_buffer_size = 0;
while ((ftdi2232_buffer_size < ftdi2232_expect_read) && timeout)
{
ftdi2232_buffer_size += ftdi_read_data(&ftdic, ftdi2232_buffer + ftdi2232_buffer_size, FTDI2232_BUFFER_SIZE - ftdi2232_buffer_size);
timeout--;
}
if (ftdi2232_expect_read != ftdi2232_buffer_size)
{
ERROR("ftdi2232_expect_read (%i) != ftdi2232_buffer_size (%i) (%i retries)", ftdi2232_expect_read, ftdi2232_buffer_size, 100 - timeout);
ftdi2232_debug_dump_buffer();
exit(-1);
}
#ifdef _DEBUG_USB_IO_
DEBUG("read buffer (%i retries): %i bytes", 100 - timeout, ftdi2232_buffer_size);
ftdi2232_debug_dump_buffer();
#endif
}
ftdi2232_expect_read = 0;
ftdi2232_read_pointer = 0;
cmd = first;
while (cmd != last)
{
switch (cmd->type)
{
case JTAG_SCAN:
type = jtag_scan_type(cmd->cmd.scan);
if (type != SCAN_OUT)
{
scan_size = jtag_scan_size(cmd->cmd.scan);
buffer = calloc(CEIL(scan_size, 8), 1);
ftdi2232_read_scan(type, buffer, scan_size);
jtag_read_buffer(buffer, cmd->cmd.scan);
free(buffer);
}
break;
default:
break;
}
cmd = cmd->next;
}
ftdi2232_buffer_size = 0;
return ERROR_OK;
}
void ftdi2232_add_scan(int ir_scan, enum scan_type type, u8 *buffer, int scan_size)
{
int num_bytes = (scan_size + 7) / 8;
int bits_left = scan_size;
int cur_byte = 0;
int last_bit;
/* command "Clock Data to TMS/CS Pin (no Read)" */
BUFFER_ADD = 0x4b;
/* scan 7 bit */
BUFFER_ADD = 0x6;
/* TMS data bits */
if (ir_scan)
{
BUFFER_ADD = TAP_MOVE(cur_state, TAP_SI);
cur_state = TAP_SI;
}
else
{
BUFFER_ADD = TAP_MOVE(cur_state, TAP_SD);
cur_state = TAP_SD;
}
//DEBUG("added TMS scan (no read)");
/* add command for complete bytes */
if (num_bytes > 1)
{
if (type == SCAN_IO)
{
/* Clock Data Bytes In and Out LSB First */
BUFFER_ADD = 0x39;
//DEBUG("added TDI bytes (io %i)", num_bytes);
}
else if (type == SCAN_OUT)
{
/* Clock Data Bytes Out on -ve Clock Edge LSB First (no Read) */
BUFFER_ADD = 0x19;
//DEBUG("added TDI bytes (o)");
}
else if (type == SCAN_IN)
{
/* Clock Data Bytes In on +ve Clock Edge LSB First (no Write) */
BUFFER_ADD = 0x28;
//DEBUG("added TDI bytes (i %i)", num_bytes);
}
BUFFER_ADD = (num_bytes-2) & 0xff;
BUFFER_ADD = ((num_bytes-2) >> 8) & 0xff;
}
if (type != SCAN_IN)
{
/* add complete bytes */
while(num_bytes-- > 1)
{
BUFFER_ADD = buffer[cur_byte];
cur_byte++;
bits_left -= 8;
}
}
if (type == SCAN_IN)
{
bits_left -= 8 * (num_bytes - 1);
}
/* the most signifcant bit is scanned during TAP movement */
if (type != SCAN_IN)
last_bit = (buffer[cur_byte] >> (bits_left - 1)) & 0x1;
else
last_bit = 0;
/* process remaining bits but the last one */
if (bits_left > 1)
{
if (type == SCAN_IO)
{
/* Clock Data Bits In and Out LSB First */
BUFFER_ADD = 0x3b;
//DEBUG("added TDI bits (io) %i", bits_left - 1);
}
else if (type == SCAN_OUT)
{
/* Clock Data Bits Out on -ve Clock Edge LSB First (no Read) */
BUFFER_ADD = 0x1b;
//DEBUG("added TDI bits (o)");
}
else if (type == SCAN_IN)
{
/* Clock Data Bits In on +ve Clock Edge LSB First (no Write) */
BUFFER_ADD = 0x2a;
//DEBUG("added TDI bits (i %i)", bits_left - 1);
}
BUFFER_ADD = bits_left - 2;
if (type != SCAN_IN)
BUFFER_ADD = buffer[cur_byte];
}
/* move from Shift-IR/DR to end state */
if (type != SCAN_OUT)
{
/* Clock Data to TMS/CS Pin with Read */
BUFFER_ADD = 0x6b;
//DEBUG("added TMS scan (read)");
}
else
{
/* Clock Data to TMS/CS Pin (no Read) */
BUFFER_ADD = 0x4b;
//DEBUG("added TMS scan (no read)");
}
BUFFER_ADD = 0x6;
BUFFER_ADD = TAP_MOVE(cur_state, end_state) | (last_bit << 7);
cur_state = end_state;
}
int ftdi2232_predict_scan_out(int scan_size, enum scan_type type)
{
int predicted_size = 6;
if (type == SCAN_IN) /* only from device to host */
{
predicted_size += (CEIL(scan_size, 8) > 1) ? 3 : 0;
predicted_size += ((scan_size - 1) % 8) ? 2 : 0;
}
else /* host to device, or bidirectional */
{
predicted_size += (CEIL(scan_size, 8) > 1) ? (CEIL(scan_size, 8) + 3 - 1) : 0;
predicted_size += ((scan_size - 1) % 8) ? 3 : 0;
}
return predicted_size;
}
int ftdi2232_predict_scan_in(int scan_size, enum scan_type type)
{
int predicted_size = 0;
if (type != SCAN_OUT)
{
/* complete bytes */
predicted_size += (CEIL(scan_size, 8) > 1) ? (CEIL(scan_size, 8) - 1) : 0;
/* remaining bits - 1 */
predicted_size += ((scan_size - 1) % 8) ? 1 : 0;
/* last bit (from TMS scan) */
predicted_size += 1;
}
//DEBUG("scan_size: %i, predicted_size: %i", scan_size, predicted_size);
return predicted_size;
}
int ftdi2232_execute_queue()
{
jtag_command_t *cmd = jtag_command_queue; /* currently processed command */
jtag_command_t *first_unsent = cmd; /* next command that has to be sent */
u8 *buffer;
int scan_size; /* size of IR or DR scan */
enum scan_type type;
int i;
int predicted_size = 0;
int require_send = 0;
ftdi2232_buffer_size = 0;
ftdi2232_expect_read = 0;
while (cmd)
{
switch(cmd->type)
{
case JTAG_END_STATE:
if (cmd->cmd.end_state->end_state != -1)
ftdi2232_end_state(cmd->cmd.end_state->end_state);
break;
case JTAG_RESET:
/* only send the maximum buffer size that FT2232C can handle */
predicted_size = 3;
if (ftdi2232_buffer_size + predicted_size + 1 > FTDI2232_SAVE_SIZE)
{
ftdi2232_send_and_recv(first_unsent, cmd);
require_send = 0;
first_unsent = cmd;
}
if (cmd->cmd.reset->trst == 1)
{
cur_state = TAP_TLR;
discrete_output &= ~FTDI2232_TRST;
}
else if (cmd->cmd.reset->trst == 0)
{
discrete_output |= FTDI2232_TRST;
}
if (cmd->cmd.reset->srst == 1)
discrete_output &= ~FTDI2232_SRST;
else if (cmd->cmd.reset->srst == 0)
discrete_output |= FTDI2232_SRST;
/* command "set data bits low byte" */
BUFFER_ADD = 0x80;
/* value (TMS=1,TCK=0, TDI=0, TRST/SRST */
BUFFER_ADD = 0x08 | discrete_output;
/* dir (output=1), TCK/TDI/TMS=out, TDO=in, TRST/SRST=out */
BUFFER_ADD = 0x0b | FTDI2232_SRST | FTDI2232_TRST;
require_send = 1;
break;
case JTAG_RUNTEST:
/* only send the maximum buffer size that FT2232C can handle */
predicted_size = 0;
if (cur_state != TAP_RTI)
predicted_size += 3;
predicted_size += 3 * CEIL(cmd->cmd.runtest->num_cycles, 7);
if ((cmd->cmd.runtest->end_state != -1) && (cmd->cmd.runtest->end_state != TAP_RTI))
predicted_size += 3;
if ((cmd->cmd.runtest->end_state == -1) && (end_state != TAP_RTI))
predicted_size += 3;
if (ftdi2232_buffer_size + predicted_size + 1 > FTDI2232_SAVE_SIZE)
{
ftdi2232_send_and_recv(first_unsent, cmd);
require_send = 0;
first_unsent = cmd;
}
if (cur_state != TAP_RTI)
{
/* command "Clock Data to TMS/CS Pin (no Read)" */
BUFFER_ADD = 0x4b;
/* scan 7 bit */
BUFFER_ADD = 0x6;
/* TMS data bits */
BUFFER_ADD = TAP_MOVE(cur_state, TAP_RTI);
cur_state = TAP_RTI;
require_send = 1;
}
i = cmd->cmd.runtest->num_cycles;
while (i > 0)
{
/* command "Clock Data to TMS/CS Pin (no Read)" */
BUFFER_ADD = 0x4b;
/* scan 7 bit */
BUFFER_ADD = (i > 7) ? 6 : (i - 1);
/* TMS data bits */
BUFFER_ADD = 0x0;
cur_state = TAP_RTI;
i -= (i > 7) ? 7 : i;
//DEBUG("added TMS scan (no read)");
}
if (cmd->cmd.runtest->end_state != -1)
ftdi2232_end_state(cmd->cmd.runtest->end_state);
if (cur_state != end_state)
{
/* command "Clock Data to TMS/CS Pin (no Read)" */
BUFFER_ADD = 0x4b;
/* scan 7 bit */
BUFFER_ADD = 0x6;
/* TMS data bits */
BUFFER_ADD = TAP_MOVE(cur_state, end_state);
cur_state = end_state;
//DEBUG("added TMS scan (no read)");
}
require_send = 1;
break;
case JTAG_STATEMOVE:
/* only send the maximum buffer size that FT2232C can handle */
predicted_size = 3;
if (ftdi2232_buffer_size + predicted_size + 1 > FTDI2232_SAVE_SIZE)
{
ftdi2232_send_and_recv(first_unsent, cmd);
require_send = 0;
first_unsent = cmd;
}
if (cmd->cmd.statemove->end_state != -1)
ftdi2232_end_state(cmd->cmd.statemove->end_state);
/* command "Clock Data to TMS/CS Pin (no Read)" */
BUFFER_ADD = 0x4b;
/* scan 7 bit */
BUFFER_ADD = 0x6;
/* TMS data bits */
BUFFER_ADD = TAP_MOVE(cur_state, end_state);
//DEBUG("added TMS scan (no read)");
cur_state = end_state;
require_send = 1;
break;
case JTAG_SCAN:
scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
type = jtag_scan_type(cmd->cmd.scan);
predicted_size = ftdi2232_predict_scan_out(scan_size, type);
if (ftdi2232_buffer_size + predicted_size + 1 > FTDI2232_SAVE_SIZE)
{
ftdi2232_send_and_recv(first_unsent, cmd);
require_send = 0;
first_unsent = cmd;
}
ftdi2232_expect_read += ftdi2232_predict_scan_in(scan_size, type);
//DEBUG("new read size: %i", ftdi2232_expect_read);
if (cmd->cmd.scan->end_state != -1)
ftdi2232_end_state(cmd->cmd.scan->end_state);
ftdi2232_add_scan(cmd->cmd.scan->ir_scan, type, buffer, scan_size);
require_send = 1;
if (buffer)
free(buffer);
break;
case JTAG_SLEEP:
jtag_sleep(cmd->cmd.sleep->us);
break;
default:
ERROR("BUG: unknown JTAG command type encountered");
exit(-1);
}
cmd = cmd->next;
}
if (require_send > 0)
ftdi2232_send_and_recv(first_unsent, cmd);
return ERROR_OK;
}
int ftdi2232_init(void)
{
if (ftdi_init(&ftdic) < 0)
return ERROR_JTAG_INIT_FAILED;
/* context, vendor id, product id */
if (ftdi_usb_open(&ftdic, ftdi2232_vid, ftdi2232_pid) < 0)
{
ERROR("unable to open ftdi device: %s", ftdic.error_str);
return ERROR_JTAG_INIT_FAILED;
}
if (ftdi_usb_reset(&ftdic) < 0)
{
ERROR("unable to reset ftdi device");
return ERROR_JTAG_INIT_FAILED;
}
if (ftdi_set_latency_timer(&ftdic, 1) < 0)
{
ERROR("unable to set latency timer");
return ERROR_JTAG_INIT_FAILED;
}
ftdi2232_buffer_size = 0;
ftdi2232_buffer = malloc(FTDI2232_BUFFER_SIZE);
ftdic.bitbang_mode = 0; /* Reset controller */
ftdi_enable_bitbang(&ftdic, 0x0b | FTDI2232_SRST | FTDI2232_TRST); /* ctx, i/o mask (out=1, in=0) */
ftdic.bitbang_mode = 2; /* MPSSE mode */
ftdi_enable_bitbang(&ftdic, 0x0b | FTDI2232_SRST | FTDI2232_TRST); /* ctx, i/o mask (out=1, in=0) */
if (ftdi_usb_purge_buffers(&ftdic) < 0)
{
ERROR("ftdi_purge_buffers: %s", ftdic.error_str);
return ERROR_JTAG_INIT_FAILED;
}
/* initialize low byte for jtag */
BUFFER_ADD = 0x80; /* command "set data bits low byte" */
BUFFER_ADD = 0x08 | FTDI2232_SRST | FTDI2232_TRST; /* value (TMS=1,TCK=0, TDI=0, xRST high) */
BUFFER_ADD = 0x0b | FTDI2232_SRST | FTDI2232_TRST; /* dir (output=1), TCK/TDI/TMS=out, TDO=in */
BUFFER_ADD = 0x85; /* command "Disconnect TDI/DO to TDO/DI for Loopback" */
ftdi2232_debug_dump_buffer();
if (ftdi_write_data(&ftdic, ftdi2232_buffer, ftdi2232_buffer_size) != 4)
return ERROR_JTAG_INIT_FAILED;
ftdi2232_speed(jtag_speed);
return ERROR_OK;
}
int ftdi2232_quit(void)
{
ftdi_disable_bitbang(&ftdic);
ftdi_usb_close(&ftdic);
ftdi_deinit(&ftdic);
free(ftdi2232_buffer);
return ERROR_OK;
}
int ftdi2232_handle_vid_pid_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
{
if (argc >= 2)
{
ftdi2232_vid = strtol(args[0], NULL, 0);
ftdi2232_pid = strtol(args[1], NULL, 0);
}
else
{
WARNING("incomplete ftdi2232_vid_pid configuration directive");
}
return ERROR_OK;
}
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