ublast2_access_libusb.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/*
 *   Driver for USB-JTAG, Altera USB-Blaster II and compatibles
 *
 *   Copyright (C) 2013 Franck Jullien franck.jullien@gmail.com
 *
 */
 
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <jtag/interface.h>
#include <jtag/commands.h>
#include "helper/system.h"
#include <libusb_helper.h>
#include <target/image.h>
 
#include "ublast_access.h"
 
#define USBBLASTER_CTRL_READ_REV    0x94
#define USBBLASTER_CTRL_LOAD_FIRM   0xA0
#define USBBLASTER_EPOUT        4
#define USBBLASTER_EPIN         8
 
#define EZUSB_CPUCS         0xe600
#define CPU_RESET           1
 
#define SECTION_BUFFERSIZE      16384
 
static int ublast2_libusb_read(struct ublast_lowlevel *low, uint8_t *buf,
                  unsigned size, uint32_t *bytes_read)
{
    int ret, tmp = 0;
 
    ret = jtag_libusb_bulk_read(low->libusb_dev,
                        USBBLASTER_EPIN |
                        LIBUSB_ENDPOINT_IN,
                        (char *)buf,
                        size,
                        100, &tmp);
    *bytes_read = tmp;
 
    return ret;
}
 
static int ublast2_libusb_write(struct ublast_lowlevel *low, uint8_t *buf,
                   int size, uint32_t *bytes_written)
{
    int ret, tmp = 0;
 
    ret = jtag_libusb_bulk_write(low->libusb_dev,
                        USBBLASTER_EPOUT |
                        LIBUSB_ENDPOINT_OUT,
                        (char *)buf,
                        size,
                        100, &tmp);
    *bytes_written = tmp;
 
    return ret;
 
}
 
static int ublast2_write_firmware_section(struct libusb_device_handle *libusb_dev,
                   struct image *firmware_image, int section_index)
{
    uint16_t chunk_size;
    uint8_t data[SECTION_BUFFERSIZE];
    uint8_t *data_ptr = data;
    size_t size_read;
 
    uint16_t size = (uint16_t)firmware_image->sections[section_index].size;
    uint16_t addr = (uint16_t)firmware_image->sections[section_index].base_address;
 
    LOG_DEBUG("section %02i at addr 0x%04x (size 0x%04x)", section_index, addr,
        size);
 
    /* Copy section contents to local buffer */
    int ret = image_read_section(firmware_image, section_index, 0, size, data,
            &size_read);
 
    if ((ret != ERROR_OK) || (size_read != size)) {
        /* Propagating the return code would return '0' (misleadingly indicating
         * successful execution of the function) if only the size check fails. */
        return ERROR_FAIL;
    }
 
    uint16_t bytes_remaining = size;
 
    /* Send section data in chunks of up to 64 bytes to ULINK */
    while (bytes_remaining > 0) {
        if (bytes_remaining > 64)
            chunk_size = 64;
        else
            chunk_size = bytes_remaining;
 
        jtag_libusb_control_transfer(libusb_dev,
                         LIBUSB_REQUEST_TYPE_VENDOR |
                         LIBUSB_ENDPOINT_OUT,
                         USBBLASTER_CTRL_LOAD_FIRM,
                         addr,
                         0,
                         (char *)data_ptr,
                         chunk_size,
                         100);
 
        bytes_remaining -= chunk_size;
        addr += chunk_size;
        data_ptr += chunk_size;
    }
 
    return ERROR_OK;
}
 
static int load_usb_blaster_firmware(struct libusb_device_handle *libusb_dev,
                     struct ublast_lowlevel *low)
{
    struct image ublast2_firmware_image;
 
    if (!low->firmware_path) {
        LOG_ERROR("No firmware path specified");
        return ERROR_FAIL;
    }
 
    if (libusb_claim_interface(libusb_dev, 0)) {
        LOG_ERROR("unable to claim interface");
        return ERROR_JTAG_INIT_FAILED;
    }
 
    ublast2_firmware_image.base_address = 0;
    ublast2_firmware_image.base_address_set = false;
 
    int ret = image_open(&ublast2_firmware_image, low->firmware_path, "ihex");
    if (ret != ERROR_OK) {
        LOG_ERROR("Could not load firmware image");
        goto error_release_usb;
    }
 
    char value = CPU_RESET;
    jtag_libusb_control_transfer(libusb_dev,
                     LIBUSB_REQUEST_TYPE_VENDOR |
                     LIBUSB_ENDPOINT_OUT,
                     USBBLASTER_CTRL_LOAD_FIRM,
                     EZUSB_CPUCS,
                     0,
                     &value,
                     1,
                     100);
 
    /* Download all sections in the image to ULINK */
    for (unsigned int i = 0; i < ublast2_firmware_image.num_sections; i++) {
        ret = ublast2_write_firmware_section(libusb_dev,
                             &ublast2_firmware_image, i);
        if (ret != ERROR_OK) {
            LOG_ERROR("Error while downloading the firmware");
            goto error_close_firmware;
        }
    }
 
    value = !CPU_RESET;
    jtag_libusb_control_transfer(libusb_dev,
                     LIBUSB_REQUEST_TYPE_VENDOR |
                     LIBUSB_ENDPOINT_OUT,
                     USBBLASTER_CTRL_LOAD_FIRM,
                     EZUSB_CPUCS,
                     0,
                     &value,
                     1,
                     100);
 
error_close_firmware:
    image_close(&ublast2_firmware_image);
 
error_release_usb:
    /*
     * Release claimed interface. Most probably it is already disconnected
     * and re-enumerated as new devices after firmware upload, so we do
     * not need to care about errors.
     */
    libusb_release_interface(libusb_dev, 0);
 
    return ret;
}
 
static int ublast2_libusb_init(struct ublast_lowlevel *low)
{
    const uint16_t vids[] = { low->ublast_vid_uninit, 0 };
    const uint16_t pids[] = { low->ublast_pid_uninit, 0 };
    struct libusb_device_handle *temp;
    bool renumeration = false;
    int ret;
 
    if (jtag_libusb_open(vids, pids, &temp, NULL) == ERROR_OK) {
        LOG_INFO("Altera USB-Blaster II (uninitialized) found");
        LOG_INFO("Loading firmware...");
        ret = load_usb_blaster_firmware(temp, low);
        jtag_libusb_close(temp);
        if (ret != ERROR_OK)
            return ret;
        renumeration = true;
    }
 
    const uint16_t vids_renum[] = { low->ublast_vid, 0 };
    const uint16_t pids_renum[] = { low->ublast_pid, 0 };
 
    if (renumeration == false) {
        if (jtag_libusb_open(vids_renum, pids_renum, &low->libusb_dev, NULL) != ERROR_OK) {
            LOG_ERROR("Altera USB-Blaster II not found");
            return ERROR_FAIL;
        }
    } else {
        int retry = 10;
        while (jtag_libusb_open(vids_renum, pids_renum, &low->libusb_dev, NULL) != ERROR_OK && retry--) {
            usleep(1000000);
            LOG_INFO("Waiting for reenumerate...");
        }
 
        if (!retry) {
            LOG_ERROR("Altera USB-Blaster II not found");
            return ERROR_FAIL;
        }
    }
 
    if (libusb_claim_interface(low->libusb_dev, 0)) {
        LOG_ERROR("unable to claim interface");
        jtag_libusb_close(low->libusb_dev);
        return ERROR_JTAG_INIT_FAILED;
    }
 
    char buffer[5];
    jtag_libusb_control_transfer(low->libusb_dev,
                     LIBUSB_REQUEST_TYPE_VENDOR |
                     LIBUSB_ENDPOINT_IN,
                     USBBLASTER_CTRL_READ_REV,
                     0,
                     0,
                     buffer,
                     5,
                     100);
 
    LOG_INFO("Altera USB-Blaster II found (Firm. rev. = %s)", buffer);
 
    return ERROR_OK;
}
 
static int ublast2_libusb_quit(struct ublast_lowlevel *low)
{
    if (libusb_release_interface(low->libusb_dev, 0))
        LOG_ERROR("usb release interface failed");
 
    jtag_libusb_close(low->libusb_dev);
    return ERROR_OK;
};
 
static struct ublast_lowlevel low = {
    .open = ublast2_libusb_init,
    .close = ublast2_libusb_quit,
    .read = ublast2_libusb_read,
    .write = ublast2_libusb_write,
    .flags = COPY_TDO_BUFFER,
};
 
struct ublast_lowlevel *ublast2_register_libusb(void)
{
    return &low;
}