src/hardware/dreamsourcelab-dslogic/protocol.c

   1 /*
   2  * This file is part of the libsigrok project.
   3  *
   4  * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
   5  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation, either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <config.h>
  22 #include <assert.h>
  23 #include <math.h>
  24 #include <glib.h>
  25 #include <glib/gstdio.h>
  26 #include "protocol.h"
  27
  28 #define DS_CMD_GET_FW_VERSION           0xb0
  29 #define DS_CMD_GET_REVID_VERSION        0xb1
  30 #define DS_CMD_START                    0xb2
  31 #define DS_CMD_CONFIG                   0xb3
  32 #define DS_CMD_SETTING                  0xb4
  33 #define DS_CMD_CONTROL                  0xb5
  34 #define DS_CMD_STATUS                   0xb6
  35 #define DS_CMD_STATUS_INFO              0xb7
  36 #define DS_CMD_WR_REG                   0xb8
  37 #define DS_CMD_WR_NVM                   0xb9
  38 #define DS_CMD_RD_NVM                   0xba
  39 #define DS_CMD_RD_NVM_PRE               0xbb
  40 #define DS_CMD_GET_HW_INFO              0xbc
  41
  42 #define DS_START_FLAGS_STOP             (1 << 7)
  43 #define DS_START_FLAGS_CLK_48MHZ        (1 << 6)
  44 #define DS_START_FLAGS_SAMPLE_WIDE      (1 << 5)
  45 #define DS_START_FLAGS_MODE_LA          (1 << 4)
  46
  47 #define DS_ADDR_COMB                    0x68
  48 #define DS_ADDR_EEWP                    0x70
  49 #define DS_ADDR_VTH                     0x78
  50
  51 #define DS_MAX_LOGIC_DEPTH              SR_MHZ(16)
  52 #define DS_MAX_LOGIC_SAMPLERATE         SR_MHZ(100)
  53 #define DS_MAX_TRIG_PERCENT             90
  54
  55 #define DS_MODE_TRIG_EN                 (1 << 0)
  56 #define DS_MODE_CLK_TYPE                (1 << 1)
  57 #define DS_MODE_CLK_EDGE                (1 << 2)
  58 #define DS_MODE_RLE_MODE                (1 << 3)
  59 #define DS_MODE_DSO_MODE                (1 << 4)
  60 #define DS_MODE_HALF_MODE               (1 << 5)
  61 #define DS_MODE_QUAR_MODE               (1 << 6)
  62 #define DS_MODE_ANALOG_MODE             (1 << 7)
  63 #define DS_MODE_FILTER                  (1 << 8)
  64 #define DS_MODE_INSTANT                 (1 << 9)
  65 #define DS_MODE_STRIG_MODE              (1 << 11)
  66 #define DS_MODE_STREAM_MODE             (1 << 12)
  67 #define DS_MODE_LPB_TEST                (1 << 13)
  68 #define DS_MODE_EXT_TEST                (1 << 14)
  69 #define DS_MODE_INT_TEST                (1 << 15)
  70
  71 #define DSLOGIC_ATOMIC_SAMPLES          (sizeof(uint64_t) * 8)
  72 #define DSLOGIC_ATOMIC_BYTES            sizeof(uint64_t)
  73
  74 /*
  75  * The FPGA is configured with TLV tuples. Length is specified as the
  76  * number of 16-bit words.
  77  */
  78 #define _DS_CFG(variable, wordcnt) ((variable << 8) | wordcnt)
  79 #define DS_CFG_START                    0xf5a5f5a5
  80 #define DS_CFG_MODE                     _DS_CFG(0, 1)
  81 #define DS_CFG_DIVIDER                  _DS_CFG(1, 2)
  82 #define DS_CFG_COUNT                    _DS_CFG(3, 2)
  83 #define DS_CFG_TRIG_POS                 _DS_CFG(5, 2)
  84 #define DS_CFG_TRIG_GLB                 _DS_CFG(7, 1)
  85 #define DS_CFG_CH_EN                    _DS_CFG(8, 1)
  86 #define DS_CFG_TRIG                     _DS_CFG(64, 160)
  87 #define DS_CFG_END                      0xfa5afa5a
  88
  89 #pragma pack(push, 1)
  90
  91 struct version_info {
  92         uint8_t major;
  93         uint8_t minor;
  94 };
  95
  96 struct cmd_start_acquisition {
  97         uint8_t flags;
  98         uint8_t sample_delay_h;
  99         uint8_t sample_delay_l;
 100 };
 101
 102 struct dslogic_fpga_config {
 103         uint32_t sync;
 104
 105         uint16_t mode_header;
 106         uint16_t mode;
 107         uint16_t divider_header;
 108         uint32_t divider;
 109         uint16_t count_header;
 110         uint32_t count;
 111         uint16_t trig_pos_header;
 112         uint32_t trig_pos;
 113         uint16_t trig_glb_header;
 114         uint16_t trig_glb;
 115         uint16_t ch_en_header;
 116         uint16_t ch_en;
 117
 118         uint16_t trig_header;
 119         uint16_t trig_mask0[NUM_TRIGGER_STAGES];
 120         uint16_t trig_mask1[NUM_TRIGGER_STAGES];
 121         uint16_t trig_value0[NUM_TRIGGER_STAGES];
 122         uint16_t trig_value1[NUM_TRIGGER_STAGES];
 123         uint16_t trig_edge0[NUM_TRIGGER_STAGES];
 124         uint16_t trig_edge1[NUM_TRIGGER_STAGES];
 125         uint16_t trig_logic0[NUM_TRIGGER_STAGES];
 126         uint16_t trig_logic1[NUM_TRIGGER_STAGES];
 127         uint32_t trig_count[NUM_TRIGGER_STAGES];
 128
 129         uint32_t end_sync;
 130 };
 131
 132 #pragma pack(pop)
 133
 134 /*
 135  * This should be larger than the FPGA bitstream image so that it'll get
 136  * uploaded in one big operation. There seem to be issues when uploading
 137  * it in chunks.
 138  */
 139 #define FW_BUFSIZE (1024 * 1024)
 140
 141 #define FPGA_UPLOAD_DELAY (10 * 1000)
 142
 143 #define USB_TIMEOUT (3 * 1000)
 144
 145 static int command_get_fw_version(libusb_device_handle *devhdl,
 146                                   struct version_info *vi)
 147 {
 148         int ret;
 149
 150         ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
 151                 LIBUSB_ENDPOINT_IN, DS_CMD_GET_FW_VERSION, 0x0000, 0x0000,
 152                 (unsigned char *)vi, sizeof(struct version_info), USB_TIMEOUT);
 153
 154         if (ret < 0) {
 155                 sr_err("Unable to get version info: %s.",
 156                        libusb_error_name(ret));
 157                 return SR_ERR;
 158         }
 159
 160         return SR_OK;
 161 }
 162
 163 static int command_get_revid_version(struct sr_dev_inst *sdi, uint8_t *revid)
 164 {
 165         struct sr_usb_dev_inst *usb = sdi->conn;
 166         libusb_device_handle *devhdl = usb->devhdl;
 167         int ret;
 168
 169         ret = libusb_control_transfer(devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
 170                 LIBUSB_ENDPOINT_IN, DS_CMD_GET_REVID_VERSION, 0x0000, 0x0000,
 171                 revid, 1, USB_TIMEOUT);
 172
 173         if (ret < 0) {
 174                 sr_err("Unable to get REVID: %s.", libusb_error_name(ret));
 175                 return SR_ERR;
 176         }
 177
 178         return SR_OK;
 179 }
 180
 181 static int command_start_acquisition(const struct sr_dev_inst *sdi)
 182 {
 183         struct sr_usb_dev_inst *usb;
 184         struct dslogic_mode mode;
 185         int ret;
 186
 187         mode.flags = DS_START_FLAGS_MODE_LA | DS_START_FLAGS_SAMPLE_WIDE;
 188         mode.sample_delay_h = mode.sample_delay_l = 0;
 189
 190         usb = sdi->conn;
 191         ret = libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
 192                         LIBUSB_ENDPOINT_OUT, DS_CMD_START, 0x0000, 0x0000,
 193                         (unsigned char *)&mode, sizeof(mode), USB_TIMEOUT);
 194         if (ret < 0) {
 195                 sr_err("Failed to send start command: %s.", libusb_error_name(ret));
 196                 return SR_ERR;
 197         }
 198
 199         return SR_OK;
 200 }
 201
 202 static int command_stop_acquisition(const struct sr_dev_inst *sdi)
 203 {
 204         struct sr_usb_dev_inst *usb;
 205         struct dslogic_mode mode;
 206         int ret;
 207
 208         mode.flags = DS_START_FLAGS_STOP;
 209         mode.sample_delay_h = mode.sample_delay_l = 0;
 210
 211         usb = sdi->conn;
 212         ret = libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
 213                         LIBUSB_ENDPOINT_OUT, DS_CMD_START, 0x0000, 0x0000,
 214                         (unsigned char *)&mode, sizeof(struct dslogic_mode), USB_TIMEOUT);
 215         if (ret < 0) {
 216                 sr_err("Failed to send stop command: %s.", libusb_error_name(ret));
 217                 return SR_ERR;
 218         }
 219
 220         return SR_OK;
 221 }
 222
 223 SR_PRIV int dslogic_fpga_firmware_upload(const struct sr_dev_inst *sdi)
 224 {
 225         const char *name = NULL;
 226         uint64_t sum;
 227         struct sr_resource bitstream;
 228         struct drv_context *drvc;
 229         struct dev_context *devc;
 230         struct sr_usb_dev_inst *usb;
 231         unsigned char *buf;
 232         ssize_t chunksize;
 233         int transferred;
 234         int result, ret;
 235         const uint8_t cmd[3] = {0, 0, 0};
 236
 237         drvc = sdi->driver->context;
 238         devc = sdi->priv;
 239         usb = sdi->conn;
 240
 241         if (!strcmp(devc->profile->model, "DSLogic")) {
 242                 if (devc->cur_threshold < 1.40)
 243                         name = DSLOGIC_FPGA_FIRMWARE_3V3;
 244                 else
 245                         name = DSLOGIC_FPGA_FIRMWARE_5V;
 246         } else if (!strcmp(devc->profile->model, "DSLogic Pro")){
 247                 name = DSLOGIC_PRO_FPGA_FIRMWARE;
 248         } else if (!strcmp(devc->profile->model, "DSLogic Plus")){
 249                 name = DSLOGIC_PLUS_FPGA_FIRMWARE;
 250         } else if (!strcmp(devc->profile->model, "DSLogic Basic")){
 251                 name = DSLOGIC_BASIC_FPGA_FIRMWARE;
 252         } else if (!strcmp(devc->profile->model, "DSCope")) {
 253                 name = DSCOPE_FPGA_FIRMWARE;
 254         } else {
 255                 sr_err("Failed to select FPGA firmware.");
 256                 return SR_ERR;
 257         }
 258
 259         sr_dbg("Uploading FPGA firmware '%s'.", name);
 260
 261         result = sr_resource_open(drvc->sr_ctx, &bitstream,
 262                         SR_RESOURCE_FIRMWARE, name);
 263         if (result != SR_OK)
 264                 return result;
 265
 266         /* Tell the device firmware is coming. */
 267         if ((ret = libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
 268                         LIBUSB_ENDPOINT_OUT, DS_CMD_CONFIG, 0x0000, 0x0000,
 269                         (unsigned char *)&cmd, sizeof(cmd), USB_TIMEOUT)) < 0) {
 270                 sr_err("Failed to upload FPGA firmware: %s.", libusb_error_name(ret));
 271                 sr_resource_close(drvc->sr_ctx, &bitstream);
 272                 return SR_ERR;
 273         }
 274
 275         /* Give the FX2 time to get ready for FPGA firmware upload. */
 276         g_usleep(FPGA_UPLOAD_DELAY);
 277
 278         buf = g_malloc(FW_BUFSIZE);
 279         sum = 0;
 280         result = SR_OK;
 281         while (1) {
 282                 chunksize = sr_resource_read(drvc->sr_ctx, &bitstream,
 283                                 buf, FW_BUFSIZE);
 284                 if (chunksize < 0)
 285                         result = SR_ERR;
 286                 if (chunksize <= 0)
 287                         break;
 288
 289                 if ((ret = libusb_bulk_transfer(usb->devhdl, 2 | LIBUSB_ENDPOINT_OUT,
 290                                 buf, chunksize, &transferred, USB_TIMEOUT)) < 0) {
 291                         sr_err("Unable to configure FPGA firmware: %s.",
 292                                         libusb_error_name(ret));
 293                         result = SR_ERR;
 294                         break;
 295                 }
 296                 sum += transferred;
 297                 sr_spew("Uploaded %" PRIu64 "/%" PRIu64 " bytes.",
 298                         sum, bitstream.size);
 299
 300                 if (transferred != chunksize) {
 301                         sr_err("Short transfer while uploading FPGA firmware.");
 302                         result = SR_ERR;
 303                         break;
 304                 }
 305         }
 306         g_free(buf);
 307         sr_resource_close(drvc->sr_ctx, &bitstream);
 308
 309         if (result == SR_OK)
 310                 sr_dbg("FPGA firmware upload done.");
 311
 312         return result;
 313 }
 314
 315 static unsigned int enabled_channel_count(const struct sr_dev_inst *sdi)
 316 {
 317         unsigned int count = 0;
 318         for (const GSList *l = sdi->channels; l; l = l->next) {
 319                 const struct sr_channel *const probe = (struct sr_channel *)l->data;
 320                 if (probe->enabled)
 321                         count++;
 322         }
 323         return count;
 324 }
 325
 326 static uint16_t enabled_channel_mask(const struct sr_dev_inst *sdi)
 327 {
 328         unsigned int mask = 0;
 329         for (const GSList *l = sdi->channels; l; l = l->next) {
 330                 const struct sr_channel *const probe = (struct sr_channel *)l->data;
 331                 if (probe->enabled)
 332                         mask |= 1 << probe->index;
 333         }
 334         return mask;
 335 }
 336
 337 /*
 338  * Get the session trigger and configure the FPGA structure
 339  * accordingly.
 340  */
 341 static void set_trigger(const struct sr_dev_inst *sdi,
 342         struct dslogic_fpga_config *cfg)
 343 {
 344         struct sr_trigger *trigger;
 345         struct sr_trigger_stage *stage;
 346         struct sr_trigger_match *match;
 347         struct dev_context *devc;
 348         const GSList *l, *m;
 349         const unsigned int num_enabled_channels = enabled_channel_count(sdi);
 350         int num_trigger_stages = 0;
 351
 352         int channelbit, i = 0;
 353         uint32_t trigger_point;
 354
 355         devc = sdi->priv;
 356
 357         cfg->ch_en = enabled_channel_mask(sdi);
 358
 359         cfg->trig_mask0[0] = 0xffff;
 360         cfg->trig_mask1[0] = 0xffff;
 361
 362         cfg->trig_value0[0] = 0;
 363         cfg->trig_value1[0] = 0;
 364
 365         cfg->trig_edge0[0] = 0;
 366         cfg->trig_edge1[0] = 0;
 367
 368         cfg->trig_logic0[0] = 2;
 369         cfg->trig_logic1[0] = 2;
 370
 371         cfg->trig_count[0] = 0;
 372
 373         cfg->trig_glb = num_enabled_channels << 4;
 374
 375         for (i = 1; i < NUM_TRIGGER_STAGES; i++) {
 376                 cfg->trig_mask0[i] = 0xffff;
 377                 cfg->trig_mask1[i] = 0xffff;
 378                 cfg->trig_value0[i] = 0;
 379                 cfg->trig_value1[i] = 0;
 380                 cfg->trig_edge0[i] = 0;
 381                 cfg->trig_edge1[i] = 0;
 382                 cfg->trig_logic0[i] = 2;
 383                 cfg->trig_logic1[i] = 2;
 384                 cfg->trig_count[i] = 0;
 385         }
 386
 387         trigger_point = (devc->capture_ratio * devc->limit_samples) / 100;
 388         if (trigger_point < DSLOGIC_ATOMIC_SAMPLES)
 389                 trigger_point = DSLOGIC_ATOMIC_SAMPLES;
 390         const uint32_t mem_depth = devc->profile->mem_depth;
 391         const uint32_t max_trigger_point = devc->continuous_mode ? ((mem_depth * 10) / 100) :
 392                 ((mem_depth * DS_MAX_TRIG_PERCENT) / 100);
 393         if (trigger_point > max_trigger_point)
 394                 trigger_point = max_trigger_point;
 395         cfg->trig_pos = trigger_point & ~(DSLOGIC_ATOMIC_SAMPLES - 1);
 396
 397         if (!(trigger = sr_session_trigger_get(sdi->session))) {
 398                 sr_dbg("No session trigger found");
 399                 return;
 400         }
 401
 402         for (l = trigger->stages; l; l = l->next) {
 403                 stage = l->data;
 404                 num_trigger_stages++;
 405                 for (m = stage->matches; m; m = m->next) {
 406                         match = m->data;
 407                         if (!match->channel->enabled)
 408                                 /* Ignore disabled channels with a trigger. */
 409                                 continue;
 410                         channelbit = 1 << (match->channel->index);
 411                         /* Simple trigger support (event). */
 412                         if (match->match == SR_TRIGGER_ONE) {
 413                                 cfg->trig_mask0[0] &= ~channelbit;
 414                                 cfg->trig_mask1[0] &= ~channelbit;
 415                                 cfg->trig_value0[0] |= channelbit;
 416                                 cfg->trig_value1[0] |= channelbit;
 417                         } else if (match->match == SR_TRIGGER_ZERO) {
 418                                 cfg->trig_mask0[0] &= ~channelbit;
 419                                 cfg->trig_mask1[0] &= ~channelbit;
 420                         } else if (match->match == SR_TRIGGER_FALLING) {
 421                                 cfg->trig_mask0[0] &= ~channelbit;
 422                                 cfg->trig_mask1[0] &= ~channelbit;
 423                                 cfg->trig_edge0[0] |= channelbit;
 424                                 cfg->trig_edge1[0] |= channelbit;
 425                         } else if (match->match == SR_TRIGGER_RISING) {
 426                                 cfg->trig_mask0[0] &= ~channelbit;
 427                                 cfg->trig_mask1[0] &= ~channelbit;
 428                                 cfg->trig_value0[0] |= channelbit;
 429                                 cfg->trig_value1[0] |= channelbit;
 430                                 cfg->trig_edge0[0] |= channelbit;
 431                                 cfg->trig_edge1[0] |= channelbit;
 432                         } else if (match->match == SR_TRIGGER_EDGE) {
 433                                 cfg->trig_edge0[0] |= channelbit;
 434                                 cfg->trig_edge1[0] |= channelbit;
 435                         }
 436                 }
 437         }
 438
 439         cfg->trig_glb |= num_trigger_stages;
 440 }
 441
 442 static int fpga_configure(const struct sr_dev_inst *sdi)
 443 {
 444         struct dev_context *devc;
 445         struct sr_usb_dev_inst *usb;
 446         uint8_t c[3];
 447         struct dslogic_fpga_config cfg;
 448         uint16_t v16;
 449         uint32_t v32;
 450         int transferred, len, ret;
 451
 452         sr_dbg("Configuring FPGA.");
 453
 454         usb = sdi->conn;
 455         devc = sdi->priv;
 456
 457         WL32(&cfg.sync, DS_CFG_START);
 458         WL16(&cfg.mode_header, DS_CFG_MODE);
 459         WL16(&cfg.divider_header, DS_CFG_DIVIDER);
 460         WL16(&cfg.count_header, DS_CFG_COUNT);
 461         WL16(&cfg.trig_pos_header, DS_CFG_TRIG_POS);
 462         WL16(&cfg.trig_glb_header, DS_CFG_TRIG_GLB);
 463         WL16(&cfg.ch_en_header, DS_CFG_CH_EN);
 464         WL16(&cfg.trig_header, DS_CFG_TRIG);
 465         WL32(&cfg.end_sync, DS_CFG_END);
 466
 467         /* Pass in the length of a fixed-size struct. Really. */
 468         len = sizeof(struct dslogic_fpga_config) / 2;
 469         c[0] = len & 0xff;
 470         c[1] = (len >> 8) & 0xff;
 471         c[2] = (len >> 16) & 0xff;
 472
 473         ret = libusb_control_transfer(usb->devhdl, LIBUSB_REQUEST_TYPE_VENDOR |
 474                         LIBUSB_ENDPOINT_OUT, DS_CMD_SETTING, 0x0000, 0x0000,
 475                         c, sizeof(c), USB_TIMEOUT);
 476         if (ret < 0) {
 477                 sr_err("Failed to send FPGA configure command: %s.",
 478                         libusb_error_name(ret));
 479                 return SR_ERR;
 480         }
 481
 482         v16 = 0x0000;
 483
 484         if (devc->mode == DS_OP_INTERNAL_TEST)
 485                 v16 = DS_MODE_INT_TEST;
 486         else if (devc->mode == DS_OP_EXTERNAL_TEST)
 487                 v16 = DS_MODE_EXT_TEST;
 488         else if (devc->mode == DS_OP_LOOPBACK_TEST)
 489                 v16 = DS_MODE_LPB_TEST;
 490
 491         if (devc->cur_samplerate == DS_MAX_LOGIC_SAMPLERATE * 2)
 492                 v16 |= DS_MODE_HALF_MODE;
 493         else if (devc->cur_samplerate == DS_MAX_LOGIC_SAMPLERATE * 4)
 494                 v16 |= DS_MODE_QUAR_MODE;
 495
 496         if (devc->continuous_mode)
 497                 v16 |= DS_MODE_STREAM_MODE;
 498         if (devc->external_clock) {
 499                 v16 |= DS_MODE_CLK_TYPE;
 500                 if (devc->clock_edge == DS_EDGE_FALLING)
 501                         v16 |= DS_MODE_CLK_EDGE;
 502         }
 503         if (devc->limit_samples > DS_MAX_LOGIC_DEPTH *
 504                 ceil(devc->cur_samplerate * 1.0 / DS_MAX_LOGIC_SAMPLERATE)
 505                 && !devc->continuous_mode) {
 506                 /* Enable RLE for long captures.
 507                  * Without this, captured data present errors.
 508                  */
 509                 v16 |= DS_MODE_RLE_MODE;
 510         }
 511
 512         WL16(&cfg.mode, v16);
 513         v32 = ceil(DS_MAX_LOGIC_SAMPLERATE * 1.0 / devc->cur_samplerate);
 514         WL32(&cfg.divider, v32);
 515
 516         /* Number of 16-sample units. */
 517         WL32(&cfg.count, devc->limit_samples / 16);
 518
 519         set_trigger(sdi, &cfg);
 520
 521         len = sizeof(struct dslogic_fpga_config);
 522         ret = libusb_bulk_transfer(usb->devhdl, 2 | LIBUSB_ENDPOINT_OUT,
 523                         (unsigned char *)&cfg, len, &transferred, USB_TIMEOUT);
 524         if (ret < 0 || transferred != len) {
 525                 sr_err("Failed to send FPGA configuration: %s.", libusb_error_name(ret));
 526                 return SR_ERR;
 527         }
 528
 529         return SR_OK;
 530 }
 531
 532 SR_PRIV int dslogic_set_voltage_threshold(const struct sr_dev_inst *sdi, double threshold)
 533 {
 534         int ret;
 535         struct dev_context *const devc = sdi->priv;
 536         const struct sr_usb_dev_inst *const usb = sdi->conn;
 537         const uint8_t value = (threshold / 5.0) * 255;
 538         const uint16_t cmd = value | (DS_ADDR_VTH << 8);
 539
 540         /* Send the control command. */
 541         ret = libusb_control_transfer(usb->devhdl,
 542                         LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_ENDPOINT_OUT,
 543                         DS_CMD_WR_REG, 0x0000, 0x0000,
 544                         (unsigned char *)&cmd, sizeof(cmd), 3000);
 545         if (ret < 0) {
 546                 sr_err("Unable to set voltage-threshold register: %s.",
 547                 libusb_error_name(ret));
 548                 return SR_ERR;
 549         }
 550
 551         devc->cur_threshold = threshold;
 552
 553         return SR_OK;
 554 }
 555
 556 SR_PRIV int dslogic_dev_open(struct sr_dev_inst *sdi, struct sr_dev_driver *di)
 557 {
 558         libusb_device **devlist;
 559         struct sr_usb_dev_inst *usb;
 560         struct libusb_device_descriptor des;
 561         struct dev_context *devc;
 562         struct drv_context *drvc;
 563         struct version_info vi;
 564         int ret, i, device_count;
 565         uint8_t revid;
 566         char connection_id[64];
 567
 568         drvc = di->context;
 569         devc = sdi->priv;
 570         usb = sdi->conn;
 571
 572         if (sdi->status == SR_ST_ACTIVE)
 573                 /* Device is already in use. */
 574                 return SR_ERR;
 575
 576         device_count = libusb_get_device_list(drvc->sr_ctx->libusb_ctx, &devlist);
 577         if (device_count < 0) {
 578                 sr_err("Failed to get device list: %s.",
 579                        libusb_error_name(device_count));
 580                 return SR_ERR;
 581         }
 582
 583         for (i = 0; i < device_count; i++) {
 584                 libusb_get_device_descriptor(devlist[i], &des);
 585
 586                 if (des.idVendor != devc->profile->vid
 587                     || des.idProduct != devc->profile->pid)
 588                         continue;
 589
 590                 if ((sdi->status == SR_ST_INITIALIZING) ||
 591                                 (sdi->status == SR_ST_INACTIVE)) {
 592                         /*
 593                          * Check device by its physical USB bus/port address.
 594                          */
 595                         usb_get_port_path(devlist[i], connection_id, sizeof(connection_id));
 596                         if (strcmp(sdi->connection_id, connection_id))
 597                                 /* This is not the one. */
 598                                 continue;
 599                 }
 600
 601                 if (!(ret = libusb_open(devlist[i], &usb->devhdl))) {
 602                         if (usb->address == 0xff)
 603                                 /*
 604                                  * First time we touch this device after FW
 605                                  * upload, so we don't know the address yet.
 606                                  */
 607                                 usb->address = libusb_get_device_address(devlist[i]);
 608                 } else {
 609                         sr_err("Failed to open device: %s.",
 610                                libusb_error_name(ret));
 611                         break;
 612                 }
 613
 614                 if (libusb_has_capability(LIBUSB_CAP_SUPPORTS_DETACH_KERNEL_DRIVER)) {
 615                         if (libusb_kernel_driver_active(usb->devhdl, USB_INTERFACE) == 1) {
 616                                 if ((ret = libusb_detach_kernel_driver(usb->devhdl, USB_INTERFACE)) < 0) {
 617                                         sr_err("Failed to detach kernel driver: %s.",
 618                                                 libusb_error_name(ret));
 619                                         return SR_ERR;
 620                                 }
 621                         }
 622                 }
 623
 624                 ret = command_get_fw_version(usb->devhdl, &vi);
 625                 if (ret != SR_OK) {
 626                         sr_err("Failed to get firmware version.");
 627                         break;
 628                 }
 629
 630                 ret = command_get_revid_version(sdi, &revid);
 631                 if (ret != SR_OK) {
 632                         sr_err("Failed to get REVID.");
 633                         break;
 634                 }
 635
 636                 /*
 637                  * Changes in major version mean incompatible/API changes, so
 638                  * bail out if we encounter an incompatible version.
 639                  * Different minor versions are OK, they should be compatible.
 640                  */
 641                 if (vi.major != DSLOGIC_REQUIRED_VERSION_MAJOR) {
 642                         sr_err("Expected firmware version %d.x, "
 643                                "got %d.%d.", DSLOGIC_REQUIRED_VERSION_MAJOR,
 644                                vi.major, vi.minor);
 645                         break;
 646                 }
 647
 648                 sdi->status = SR_ST_ACTIVE;
 649                 sr_info("Opened device on %d.%d (logical) / %s (physical), "
 650                         "interface %d, firmware %d.%d.",
 651                         usb->bus, usb->address, connection_id,
 652                         USB_INTERFACE, vi.major, vi.minor);
 653
 654                 sr_info("Detected REVID=%d, it's a Cypress CY7C68013%s.",
 655                         revid, (revid != 1) ? " (FX2)" : "A (FX2LP)");
 656
 657                 break;
 658         }
 659         libusb_free_device_list(devlist, 1);
 660
 661         if (sdi->status != SR_ST_ACTIVE)
 662                 return SR_ERR;
 663
 664         return SR_OK;
 665 }
 666
 667 SR_PRIV struct dev_context *dslogic_dev_new(void)
 668 {
 669         struct dev_context *devc;
 670
 671         devc = g_malloc0(sizeof(struct dev_context));
 672         devc->profile = NULL;
 673         devc->fw_updated = 0;
 674         devc->cur_samplerate = 0;
 675         devc->limit_samples = 0;
 676         devc->capture_ratio = 0;
 677         devc->continuous_mode = FALSE;
 678         devc->clock_edge = DS_EDGE_RISING;
 679
 680         return devc;
 681 }
 682
 683 static void abort_acquisition(struct dev_context *devc)
 684 {
 685         int i;
 686
 687         devc->acq_aborted = TRUE;
 688
 689         for (i = devc->num_transfers - 1; i >= 0; i--) {
 690                 if (devc->transfers[i])
 691                         libusb_cancel_transfer(devc->transfers[i]);
 692         }
 693 }
 694
 695 static void finish_acquisition(struct sr_dev_inst *sdi)
 696 {
 697         struct dev_context *devc;
 698
 699         devc = sdi->priv;
 700
 701         std_session_send_df_end(sdi);
 702
 703         usb_source_remove(sdi->session, devc->ctx);
 704
 705         devc->num_transfers = 0;
 706         g_free(devc->transfers);
 707         g_free(devc->deinterleave_buffer);
 708 }
 709
 710 static void free_transfer(struct libusb_transfer *transfer)
 711 {
 712         struct sr_dev_inst *sdi;
 713         struct dev_context *devc;
 714         unsigned int i;
 715
 716         sdi = transfer->user_data;
 717         devc = sdi->priv;
 718
 719         g_free(transfer->buffer);
 720         transfer->buffer = NULL;
 721         libusb_free_transfer(transfer);
 722
 723         for (i = 0; i < devc->num_transfers; i++) {
 724                 if (devc->transfers[i] == transfer) {
 725                         devc->transfers[i] = NULL;
 726                         break;
 727                 }
 728         }
 729
 730         devc->submitted_transfers--;
 731         if (devc->submitted_transfers == 0)
 732                 finish_acquisition(sdi);
 733 }
 734
 735 static void resubmit_transfer(struct libusb_transfer *transfer)
 736 {
 737         int ret;
 738
 739         if ((ret = libusb_submit_transfer(transfer)) == LIBUSB_SUCCESS)
 740                 return;
 741
 742         sr_err("%s: %s", __func__, libusb_error_name(ret));
 743         free_transfer(transfer);
 744
 745 }
 746
 747 static void deinterleave_buffer(const uint8_t *src, size_t length,
 748         uint16_t *dst_ptr, size_t channel_count, uint16_t channel_mask)
 749 {
 750         uint16_t sample;
 751
 752         for (const uint64_t *src_ptr = (uint64_t*)src;
 753                 src_ptr < (uint64_t*)(src + length);
 754                 src_ptr += channel_count) {
 755                 for (int bit = 0; bit != 64; bit++) {
 756                         const uint64_t *word_ptr = src_ptr;
 757                         sample = 0;
 758                         for (size_t channel = 0; channel != channel_count;
 759                                 channel++) {
 760                                 if ((channel_mask & (1 << channel)) &&
 761                                         (*word_ptr++ & (1ULL << bit)))
 762                                         sample |= 1 << channel;
 763                         }
 764                         *dst_ptr++ = sample;
 765                 }
 766         }
 767 }
 768
 769 static void send_data(struct sr_dev_inst *sdi,
 770         uint16_t *data, size_t sample_count)
 771 {
 772         const struct sr_datafeed_logic logic = {
 773                 .length = sample_count * sizeof(uint16_t),
 774                 .unitsize = sizeof(uint16_t),
 775                 .data = data
 776         };
 777
 778         const struct sr_datafeed_packet packet = {
 779                 .type = SR_DF_LOGIC,
 780                 .payload = &logic
 781         };
 782
 783         sr_session_send(sdi, &packet);
 784 }
 785
 786 static void LIBUSB_CALL receive_transfer(struct libusb_transfer *transfer)
 787 {
 788         struct sr_dev_inst *const sdi = transfer->user_data;
 789         struct dev_context *const devc = sdi->priv;
 790         const size_t channel_count = enabled_channel_count(sdi);
 791         const uint16_t channel_mask = enabled_channel_mask(sdi);
 792         const unsigned int cur_sample_count = DSLOGIC_ATOMIC_SAMPLES *
 793                 transfer->actual_length /
 794                 (DSLOGIC_ATOMIC_BYTES * channel_count);
 795
 796         gboolean packet_has_error = FALSE;
 797         struct sr_datafeed_packet packet;
 798         unsigned int num_samples;
 799         int trigger_offset;
 800
 801         /*
 802          * If acquisition has already ended, just free any queued up
 803          * transfer that come in.
 804          */
 805         if (devc->acq_aborted) {
 806                 free_transfer(transfer);
 807                 return;
 808         }
 809
 810         sr_dbg("receive_transfer(): status %s received %d bytes.",
 811                 libusb_error_name(transfer->status), transfer->actual_length);
 812
 813         /* Save incoming transfer before reusing the transfer struct. */
 814
 815         switch (transfer->status) {
 816         case LIBUSB_TRANSFER_NO_DEVICE:
 817                 abort_acquisition(devc);
 818                 free_transfer(transfer);
 819                 return;
 820         case LIBUSB_TRANSFER_COMPLETED:
 821         case LIBUSB_TRANSFER_TIMED_OUT: /* We may have received some data though. */
 822                 break;
 823         default:
 824                 packet_has_error = TRUE;
 825                 break;
 826         }
 827
 828         if (transfer->actual_length == 0 || packet_has_error) {
 829                 devc->empty_transfer_count++;
 830                 if (devc->empty_transfer_count > MAX_EMPTY_TRANSFERS) {
 831                         /*
 832                          * The FX2 gave up. End the acquisition, the frontend
 833                          * will work out that the samplecount is short.
 834                          */
 835                         abort_acquisition(devc);
 836                         free_transfer(transfer);
 837                 } else {
 838                         resubmit_transfer(transfer);
 839                 }
 840                 return;
 841         } else {
 842                 devc->empty_transfer_count = 0;
 843         }
 844
 845         if (!devc->limit_samples || devc->sent_samples < devc->limit_samples) {
 846                 if (devc->limit_samples && devc->sent_samples + cur_sample_count > devc->limit_samples)
 847                         num_samples = devc->limit_samples - devc->sent_samples;
 848                 else
 849                         num_samples = cur_sample_count;
 850
 851                 /**
 852                  * The DSLogic emits sample data as sequences of 64-bit sample words
 853                  * in a round-robin i.e. 64-bits from channel 0, 64-bits from channel 1
 854                  * etc. for each of the enabled channels, then looping back to the
 855                  * channel.
 856                  *
 857                  * Because sigrok's internal representation is bit-interleaved channels
 858                  * we must recast the data.
 859                  *
 860                  * Hopefully in future it will be possible to pass the data on as-is.
 861                  */
 862                 assert(transfer->actual_length % (DSLOGIC_ATOMIC_BYTES * channel_count) == 0);
 863                 deinterleave_buffer(transfer->buffer, transfer->actual_length,
 864                         devc->deinterleave_buffer, channel_count, channel_mask);
 865
 866                 /* Send the incoming transfer to the session bus. */
 867                 if (devc->trigger_pos > devc->sent_samples
 868                         && devc->trigger_pos <= devc->sent_samples + num_samples) {
 869                         /* DSLogic trigger in this block. Send trigger position. */
 870                         trigger_offset = devc->trigger_pos - devc->sent_samples;
 871                         /* Pre-trigger samples. */
 872                         send_data(sdi, devc->deinterleave_buffer, trigger_offset);
 873                         devc->sent_samples += trigger_offset;
 874                         /* Trigger position. */
 875                         devc->trigger_pos = 0;
 876                         packet.type = SR_DF_TRIGGER;
 877                         packet.payload = NULL;
 878                         sr_session_send(sdi, &packet);
 879                         /* Post trigger samples. */
 880                         num_samples -= trigger_offset;
 881                         send_data(sdi, devc->deinterleave_buffer
 882                                 + trigger_offset, num_samples);
 883                         devc->sent_samples += num_samples;
 884                 } else {
 885                         send_data(sdi, devc->deinterleave_buffer, num_samples);
 886                         devc->sent_samples += num_samples;
 887                 }
 888         }
 889
 890         if (devc->limit_samples && devc->sent_samples >= devc->limit_samples) {
 891                 abort_acquisition(devc);
 892                 free_transfer(transfer);
 893         } else
 894                 resubmit_transfer(transfer);
 895 }
 896
 897 static int receive_data(int fd, int revents, void *cb_data)
 898 {
 899         struct timeval tv;
 900         struct drv_context *drvc;
 901
 902         (void)fd;
 903         (void)revents;
 904
 905         drvc = (struct drv_context *)cb_data;
 906
 907         tv.tv_sec = tv.tv_usec = 0;
 908         libusb_handle_events_timeout(drvc->sr_ctx->libusb_ctx, &tv);
 909
 910         return TRUE;
 911 }
 912
 913 static size_t to_bytes_per_ms(const struct sr_dev_inst *sdi)
 914 {
 915         const struct dev_context *const devc = sdi->priv;
 916         const size_t ch_count = enabled_channel_count(sdi);
 917
 918         if (devc->continuous_mode)
 919                 return (devc->cur_samplerate * ch_count) / (1000 * 8);
 920
 921
 922         /* If we're in buffered mode, the transfer rate is not so important,
 923          * but we expect to get at least 10% of the high-speed USB bandwidth.
 924          */
 925         return 35000000 / (1000 * 10);
 926 }
 927
 928 static size_t get_buffer_size(const struct sr_dev_inst *sdi)
 929 {
 930         /*
 931          * The buffer should be large enough to hold 10ms of data and
 932          * a multiple of the size of a data atom.
 933          */
 934         const size_t block_size = enabled_channel_count(sdi) * 512;
 935         const size_t s = 10 * to_bytes_per_ms(sdi);
 936         return ((s + block_size - 1) / block_size) * block_size;
 937 }
 938
 939 static unsigned int get_number_of_transfers(const struct sr_dev_inst *sdi)
 940 {
 941         /* Total buffer size should be able to hold about 100ms of data. */
 942         const unsigned int s = get_buffer_size(sdi);
 943         const unsigned int n = (100 * to_bytes_per_ms(sdi) + s - 1) / s;
 944         return (n > NUM_SIMUL_TRANSFERS) ? NUM_SIMUL_TRANSFERS : n;
 945 }
 946
 947 static unsigned int get_timeout(const struct sr_dev_inst *sdi)
 948 {
 949         const size_t total_size = get_buffer_size(sdi) *
 950                 get_number_of_transfers(sdi);
 951         const unsigned int timeout = total_size / to_bytes_per_ms(sdi);
 952         return timeout + timeout / 4; /* Leave a headroom of 25% percent. */
 953 }
 954
 955 static int start_transfers(const struct sr_dev_inst *sdi)
 956 {
 957         const size_t channel_count = enabled_channel_count(sdi);
 958         const size_t size = get_buffer_size(sdi);
 959         const unsigned int num_transfers = get_number_of_transfers(sdi);
 960         const unsigned int timeout = get_timeout(sdi);
 961
 962         struct dev_context *devc;
 963         struct sr_usb_dev_inst *usb;
 964         struct libusb_transfer *transfer;
 965         unsigned int i;
 966         int ret;
 967         unsigned char *buf;
 968
 969         devc = sdi->priv;
 970         usb = sdi->conn;
 971
 972         devc->sent_samples = 0;
 973         devc->acq_aborted = FALSE;
 974         devc->empty_transfer_count = 0;
 975         devc->submitted_transfers = 0;
 976
 977         g_free(devc->transfers);
 978         devc->transfers = g_try_malloc0(sizeof(*devc->transfers) * num_transfers);
 979         if (!devc->transfers) {
 980                 sr_err("USB transfers malloc failed.");
 981                 return SR_ERR_MALLOC;
 982         }
 983
 984         devc->deinterleave_buffer = g_try_malloc(DSLOGIC_ATOMIC_SAMPLES *
 985                 (size / (channel_count * DSLOGIC_ATOMIC_BYTES)) * sizeof(uint16_t));
 986         if (!devc->deinterleave_buffer) {
 987                 sr_err("Deinterleave buffer malloc failed.");
 988                 g_free(devc->deinterleave_buffer);
 989                 return SR_ERR_MALLOC;
 990         }
 991
 992         devc->num_transfers = num_transfers;
 993         for (i = 0; i < num_transfers; i++) {
 994                 if (!(buf = g_try_malloc(size))) {
 995                         sr_err("USB transfer buffer malloc failed.");
 996                         return SR_ERR_MALLOC;
 997                 }
 998                 transfer = libusb_alloc_transfer(0);
 999                 libusb_fill_bulk_transfer(transfer, usb->devhdl,
1000                                 6 | LIBUSB_ENDPOINT_IN, buf, size,
1001                                 receive_transfer, (void *)sdi, timeout);
1002                 sr_info("submitting transfer: %d", i);
1003                 if ((ret = libusb_submit_transfer(transfer)) != 0) {
1004                         sr_err("Failed to submit transfer: %s.",
1005                                libusb_error_name(ret));
1006                         libusb_free_transfer(transfer);
1007                         g_free(buf);
1008                         abort_acquisition(devc);
1009                         return SR_ERR;
1010                 }
1011                 devc->transfers[i] = transfer;
1012                 devc->submitted_transfers++;
1013         }
1014
1015         std_session_send_df_header(sdi);
1016
1017         return SR_OK;
1018 }
1019
1020 static void LIBUSB_CALL trigger_receive(struct libusb_transfer *transfer)
1021 {
1022         const struct sr_dev_inst *sdi;
1023         struct dslogic_trigger_pos *tpos;
1024         struct dev_context *devc;
1025
1026         sdi = transfer->user_data;
1027         devc = sdi->priv;
1028         if (transfer->status == LIBUSB_TRANSFER_CANCELLED) {
1029                 sr_dbg("Trigger transfer canceled.");
1030                 /* Terminate session. */
1031                 std_session_send_df_end(sdi);
1032                 usb_source_remove(sdi->session, devc->ctx);
1033                 devc->num_transfers = 0;
1034                 g_free(devc->transfers);
1035         } else if (transfer->status == LIBUSB_TRANSFER_COMPLETED
1036                         && transfer->actual_length == sizeof(struct dslogic_trigger_pos)) {
1037                 tpos = (struct dslogic_trigger_pos *)transfer->buffer;
1038                 sr_info("tpos real_pos %d ram_saddr %d cnt %d", tpos->real_pos,
1039                         tpos->ram_saddr, tpos->remain_cnt);
1040                 devc->trigger_pos = tpos->real_pos;
1041                 g_free(tpos);
1042                 start_transfers(sdi);
1043         }
1044         libusb_free_transfer(transfer);
1045 }
1046
1047 SR_PRIV int dslogic_acquisition_start(const struct sr_dev_inst *sdi)
1048 {
1049         const unsigned int timeout = get_timeout(sdi);
1050
1051         struct sr_dev_driver *di;
1052         struct drv_context *drvc;
1053         struct dev_context *devc;
1054         struct sr_usb_dev_inst *usb;
1055         struct dslogic_trigger_pos *tpos;
1056         struct libusb_transfer *transfer;
1057         int ret;
1058
1059         if (sdi->status != SR_ST_ACTIVE)
1060                 return SR_ERR_DEV_CLOSED;
1061
1062         di = sdi->driver;
1063         drvc = di->context;
1064         devc = sdi->priv;
1065         usb = sdi->conn;
1066
1067         devc->ctx = drvc->sr_ctx;
1068         devc->sent_samples = 0;
1069         devc->empty_transfer_count = 0;
1070         devc->acq_aborted = FALSE;
1071
1072         usb_source_add(sdi->session, devc->ctx, timeout, receive_data, drvc);
1073
1074         if ((ret = command_stop_acquisition(sdi)) != SR_OK)
1075                 return ret;
1076
1077         if ((ret = fpga_configure(sdi)) != SR_OK)
1078                 return ret;
1079
1080         if ((ret = command_start_acquisition(sdi)) != SR_OK)
1081                 return ret;
1082
1083         sr_dbg("Getting trigger.");
1084         tpos = g_malloc(sizeof(struct dslogic_trigger_pos));
1085         transfer = libusb_alloc_transfer(0);
1086         libusb_fill_bulk_transfer(transfer, usb->devhdl, 6 | LIBUSB_ENDPOINT_IN,
1087                         (unsigned char *)tpos, sizeof(struct dslogic_trigger_pos),
1088                         trigger_receive, (void *)sdi, 0);
1089         if ((ret = libusb_submit_transfer(transfer)) < 0) {
1090                 sr_err("Failed to request trigger: %s.", libusb_error_name(ret));
1091                 libusb_free_transfer(transfer);
1092                 g_free(tpos);
1093                 return SR_ERR;
1094         }
1095
1096         devc->transfers = g_try_malloc0(sizeof(*devc->transfers));
1097         if (!devc->transfers) {
1098                 sr_err("USB trigger_pos transfer malloc failed.");
1099                 return SR_ERR_MALLOC;
1100         }
1101         devc->num_transfers = 1;
1102         devc->submitted_transfers++;
1103         devc->transfers[0] = transfer;
1104
1105         return ret;
1106 }
1107
1108 SR_PRIV int dslogic_acquisition_stop(struct sr_dev_inst *sdi)
1109 {
1110         command_stop_acquisition(sdi);
1111         abort_acquisition(sdi->priv);
1112         return SR_OK;
1113 }