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   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /*
   4  *   Driver for USB-JTAG, Altera USB-Blaster II and compatibles
   5  *
   6  *   Copyright (C) 2013 Franck Jullien franck.jullien@gmail.com
   7  *
   8  */
   9
  10 #ifdef HAVE_CONFIG_H
  11 #include <config.h>
  12 #endif
  13 #include <jtag/interface.h>
  14 #include <jtag/commands.h>
  15 #include "helper/system.h"
  16 #include <libusb_helper.h>
  17 #include <target/image.h>
  18
  19 #include "ublast_access.h"
  20
  21 #define USBBLASTER_CTRL_READ_REV        0x94
  22 #define USBBLASTER_CTRL_LOAD_FIRM       0xA0
  23 #define USBBLASTER_EPOUT                4
  24 #define USBBLASTER_EPIN                 8
  25
  26 #define EZUSB_CPUCS                     0xe600
  27 #define CPU_RESET                       1
  28
  29 /** Maximum size of a single firmware section. Entire EZ-USB code space = 16kB */
  30 #define SECTION_BUFFERSIZE              16384
  31
  32 static int ublast2_libusb_read(struct ublast_lowlevel *low, uint8_t *buf,
  33                               unsigned size, uint32_t *bytes_read)
  34 {
  35         int ret, tmp = 0;
  36
  37         ret = jtag_libusb_bulk_read(low->libusb_dev,
  38                                             USBBLASTER_EPIN |
  39                                             LIBUSB_ENDPOINT_IN,
  40                                             (char *)buf,
  41                                             size,
  42                                             100, &tmp);
  43         *bytes_read = tmp;
  44
  45         return ret;
  46 }
  47
  48 static int ublast2_libusb_write(struct ublast_lowlevel *low, uint8_t *buf,
  49                                int size, uint32_t *bytes_written)
  50 {
  51         int ret, tmp = 0;
  52
  53         ret = jtag_libusb_bulk_write(low->libusb_dev,
  54                                                 USBBLASTER_EPOUT |
  55                                                 LIBUSB_ENDPOINT_OUT,
  56                                                 (char *)buf,
  57                                                 size,
  58                                                 100, &tmp);
  59         *bytes_written = tmp;
  60
  61         return ret;
  62
  63 }
  64
  65 static int ublast2_write_firmware_section(struct libusb_device_handle *libusb_dev,
  66                                    struct image *firmware_image, int section_index)
  67 {
  68         uint16_t chunk_size;
  69         uint8_t data[SECTION_BUFFERSIZE];
  70         uint8_t *data_ptr = data;
  71         size_t size_read;
  72
  73         uint16_t size = (uint16_t)firmware_image->sections[section_index].size;
  74         uint16_t addr = (uint16_t)firmware_image->sections[section_index].base_address;
  75
  76         LOG_DEBUG("section %02i at addr 0x%04x (size 0x%04x)", section_index, addr,
  77                 size);
  78
  79         /* Copy section contents to local buffer */
  80         int ret = image_read_section(firmware_image, section_index, 0, size, data,
  81                         &size_read);
  82
  83         if ((ret != ERROR_OK) || (size_read != size)) {
  84                 /* Propagating the return code would return '0' (misleadingly indicating
  85                  * successful execution of the function) if only the size check fails. */
  86                 return ERROR_FAIL;
  87         }
  88
  89         uint16_t bytes_remaining = size;
  90
  91         /* Send section data in chunks of up to 64 bytes to ULINK */
  92         while (bytes_remaining > 0) {
  93                 if (bytes_remaining > 64)
  94                         chunk_size = 64;
  95                 else
  96                         chunk_size = bytes_remaining;
  97
  98                 jtag_libusb_control_transfer(libusb_dev,
  99                                              LIBUSB_REQUEST_TYPE_VENDOR |
 100                                              LIBUSB_ENDPOINT_OUT,
 101                                              USBBLASTER_CTRL_LOAD_FIRM,
 102                                              addr,
 103                                              0,
 104                                              (char *)data_ptr,
 105                                              chunk_size,
 106                                              100);
 107
 108                 bytes_remaining -= chunk_size;
 109                 addr += chunk_size;
 110                 data_ptr += chunk_size;
 111         }
 112
 113         return ERROR_OK;
 114 }
 115
 116 static int load_usb_blaster_firmware(struct libusb_device_handle *libusb_dev,
 117                                      struct ublast_lowlevel *low)
 118 {
 119         struct image ublast2_firmware_image;
 120
 121         if (!low->firmware_path) {
 122                 LOG_ERROR("No firmware path specified");
 123                 return ERROR_FAIL;
 124         }
 125
 126         if (libusb_claim_interface(libusb_dev, 0)) {
 127                 LOG_ERROR("unable to claim interface");
 128                 return ERROR_JTAG_INIT_FAILED;
 129         }
 130
 131         ublast2_firmware_image.base_address = 0;
 132         ublast2_firmware_image.base_address_set = false;
 133
 134         int ret = image_open(&ublast2_firmware_image, low->firmware_path, "ihex");
 135         if (ret != ERROR_OK) {
 136                 LOG_ERROR("Could not load firmware image");
 137                 goto error_release_usb;
 138         }
 139
 140         /** A host loader program must write 0x01 to the CPUCS register
 141          * to put the CPU into RESET, load all or part of the EZUSB
 142          * RAM with firmware, then reload the CPUCS register
 143          * with ‘0’ to take the CPU out of RESET. The CPUCS register
 144          * (at 0xE600) is the only EZ-USB register that can be written
 145          * using the Firmware Download command.
 146          */
 147
 148         char value = CPU_RESET;
 149         jtag_libusb_control_transfer(libusb_dev,
 150                                      LIBUSB_REQUEST_TYPE_VENDOR |
 151                                      LIBUSB_ENDPOINT_OUT,
 152                                      USBBLASTER_CTRL_LOAD_FIRM,
 153                                      EZUSB_CPUCS,
 154                                      0,
 155                                      &value,
 156                                      1,
 157                                      100);
 158
 159         /* Download all sections in the image to ULINK */
 160         for (unsigned int i = 0; i < ublast2_firmware_image.num_sections; i++) {
 161                 ret = ublast2_write_firmware_section(libusb_dev,
 162                                                      &ublast2_firmware_image, i);
 163                 if (ret != ERROR_OK) {
 164                         LOG_ERROR("Error while downloading the firmware");
 165                         goto error_close_firmware;
 166                 }
 167         }
 168
 169         value = !CPU_RESET;
 170         jtag_libusb_control_transfer(libusb_dev,
 171                                      LIBUSB_REQUEST_TYPE_VENDOR |
 172                                      LIBUSB_ENDPOINT_OUT,
 173                                      USBBLASTER_CTRL_LOAD_FIRM,
 174                                      EZUSB_CPUCS,
 175                                      0,
 176                                      &value,
 177                                      1,
 178                                      100);
 179
 180 error_close_firmware:
 181         image_close(&ublast2_firmware_image);
 182
 183 error_release_usb:
 184         /*
 185          * Release claimed interface. Most probably it is already disconnected
 186          * and re-enumerated as new devices after firmware upload, so we do
 187          * not need to care about errors.
 188          */
 189         libusb_release_interface(libusb_dev, 0);
 190
 191         return ret;
 192 }
 193
 194 static int ublast2_libusb_init(struct ublast_lowlevel *low)
 195 {
 196         const uint16_t vids[] = { low->ublast_vid_uninit, 0 };
 197         const uint16_t pids[] = { low->ublast_pid_uninit, 0 };
 198         struct libusb_device_handle *temp;
 199         bool renumeration = false;
 200         int ret;
 201
 202         if (jtag_libusb_open(vids, pids, &temp, NULL) == ERROR_OK) {
 203                 LOG_INFO("Altera USB-Blaster II (uninitialized) found");
 204                 LOG_INFO("Loading firmware...");
 205                 ret = load_usb_blaster_firmware(temp, low);
 206                 jtag_libusb_close(temp);
 207                 if (ret != ERROR_OK)
 208                         return ret;
 209                 renumeration = true;
 210         }
 211
 212         const uint16_t vids_renum[] = { low->ublast_vid, 0 };
 213         const uint16_t pids_renum[] = { low->ublast_pid, 0 };
 214
 215         if (renumeration == false) {
 216                 if (jtag_libusb_open(vids_renum, pids_renum, &low->libusb_dev, NULL) != ERROR_OK) {
 217                         LOG_ERROR("Altera USB-Blaster II not found");
 218                         return ERROR_FAIL;
 219                 }
 220         } else {
 221                 int retry = 10;
 222                 while (jtag_libusb_open(vids_renum, pids_renum, &low->libusb_dev, NULL) != ERROR_OK && retry--) {
 223                         usleep(1000000);
 224                         LOG_INFO("Waiting for reenumerate...");
 225                 }
 226
 227                 if (!retry) {
 228                         LOG_ERROR("Altera USB-Blaster II not found");
 229                         return ERROR_FAIL;
 230                 }
 231         }
 232
 233         if (libusb_claim_interface(low->libusb_dev, 0)) {
 234                 LOG_ERROR("unable to claim interface");
 235                 jtag_libusb_close(low->libusb_dev);
 236                 return ERROR_JTAG_INIT_FAILED;
 237         }
 238
 239         char buffer[5];
 240         jtag_libusb_control_transfer(low->libusb_dev,
 241                                      LIBUSB_REQUEST_TYPE_VENDOR |
 242                                      LIBUSB_ENDPOINT_IN,
 243                                      USBBLASTER_CTRL_READ_REV,
 244                                      0,
 245                                      0,
 246                                      buffer,
 247                                      5,
 248                                      100);
 249
 250         LOG_INFO("Altera USB-Blaster II found (Firm. rev. = %s)", buffer);
 251
 252         return ERROR_OK;
 253 }
 254
 255 static int ublast2_libusb_quit(struct ublast_lowlevel *low)
 256 {
 257         if (libusb_release_interface(low->libusb_dev, 0))
 258                 LOG_ERROR("usb release interface failed");
 259
 260         jtag_libusb_close(low->libusb_dev);
 261         return ERROR_OK;
 262 };
 263
 264 static struct ublast_lowlevel low = {
 265         .open = ublast2_libusb_init,
 266         .close = ublast2_libusb_quit,
 267         .read = ublast2_libusb_read,
 268         .write = ublast2_libusb_write,
 269         .flags = COPY_TDO_BUFFER,
 270 };
 271
 272 struct ublast_lowlevel *ublast2_register_libusb(void)
 273 {
 274         return &low;
 275 }