128 lines
3.0 KiB
C
128 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Driver for USB-JTAG, Altera USB-Blaster and compatibles
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*
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* Inspired from original code from Kolja Waschk's USB-JTAG project
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* (http://www.ixo.de/info/usb_jtag/), and from openocd project.
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*
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* Copyright (C) 2012 Robert Jarzmik robert.jarzmik@free.fr
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* Copyright (C) 2011 Ali Lown ali@lown.me.uk
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* Copyright (C) 2009 Catalin Patulea cat@vv.carleton.ca
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* Copyright (C) 2006 Kolja Waschk usbjtag@ixo.de
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <jtag/interface.h>
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#include <jtag/commands.h>
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#include "ublast_access.h"
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#include <ftdi.h>
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static struct ftdi_context *ublast_getftdic(struct ublast_lowlevel *low)
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{
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return low->priv;
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}
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static int ublast_ftdi_read(struct ublast_lowlevel *low, uint8_t *buf,
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unsigned size, uint32_t *bytes_read)
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{
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int retval;
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int timeout = 100;
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struct ftdi_context *ftdic = ublast_getftdic(low);
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*bytes_read = 0;
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while ((*bytes_read < size) && timeout--) {
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retval = ftdi_read_data(ftdic, buf + *bytes_read,
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size - *bytes_read);
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if (retval < 0) {
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*bytes_read = 0;
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LOG_ERROR("ftdi_read_data: %s",
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ftdi_get_error_string(ftdic));
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return ERROR_JTAG_DEVICE_ERROR;
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}
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*bytes_read += retval;
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}
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return ERROR_OK;
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}
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static int ublast_ftdi_write(struct ublast_lowlevel *low, uint8_t *buf, int size,
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uint32_t *bytes_written)
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{
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int retval;
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struct ftdi_context *ftdic = ublast_getftdic(low);
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retval = ftdi_write_data(ftdic, buf, size);
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if (retval < 0) {
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*bytes_written = 0;
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LOG_ERROR("ftdi_write_data: %s",
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ftdi_get_error_string(ftdic));
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return ERROR_JTAG_DEVICE_ERROR;
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}
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*bytes_written = retval;
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return ERROR_OK;
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}
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static int ublast_ftdi_init(struct ublast_lowlevel *low)
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{
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uint8_t latency_timer;
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struct ftdi_context *ftdic = ublast_getftdic(low);
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LOG_INFO("usb blaster interface using libftdi");
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if (ftdi_init(ftdic) < 0)
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return ERROR_JTAG_INIT_FAILED;
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/* context, vendor id, product id */
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if (ftdi_usb_open(ftdic, low->ublast_vid, low->ublast_pid) < 0) {
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LOG_ERROR("unable to open ftdi device: %s", ftdic->error_str);
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return ERROR_JTAG_INIT_FAILED;
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}
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if (ftdi_usb_reset(ftdic) < 0) {
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LOG_ERROR("unable to reset ftdi device");
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return ERROR_JTAG_INIT_FAILED;
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}
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if (ftdi_set_latency_timer(ftdic, 2) < 0) {
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LOG_ERROR("unable to set latency timer");
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return ERROR_JTAG_INIT_FAILED;
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}
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if (ftdi_get_latency_timer(ftdic, &latency_timer) < 0)
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LOG_ERROR("unable to get latency timer");
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else
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LOG_DEBUG("current latency timer: %u", latency_timer);
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ftdi_disable_bitbang(ftdic);
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return ERROR_OK;
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}
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static int ublast_ftdi_quit(struct ublast_lowlevel *low)
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{
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struct ftdi_context *ftdic = ublast_getftdic(low);
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ftdi_usb_close(ftdic);
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ftdi_deinit(ftdic);
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return ERROR_OK;
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};
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static struct ublast_lowlevel_priv {
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struct ftdi_context ftdic;
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} info;
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static struct ublast_lowlevel low = {
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.open = ublast_ftdi_init,
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.close = ublast_ftdi_quit,
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.read = ublast_ftdi_read,
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.write = ublast_ftdi_write,
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.priv = &info,
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};
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struct ublast_lowlevel *ublast_register_ftdi(void)
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{
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return &low;
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}
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