drivers/misc/altera-stapl/altera-jtag.c

   1 /*
   2  * altera-jtag.c
   3  *
   4  * altera FPGA driver
   5  *
   6  * Copyright (C) Altera Corporation 1998-2001
   7  * Copyright (C) 2010 NetUP Inc.
   8  * Copyright (C) 2010 Igor M. Liplianin <[email protected]>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  */
  25
  26 #include <linux/delay.h>
  27 #include <linux/firmware.h>
  28 #include <linux/slab.h>
  29 #include <misc/altera.h>
  30 #include "altera-exprt.h"
  31 #include "altera-jtag.h"
  32
  33 #define alt_jtag_io(a, b, c)\
  34                 astate->config->jtag_io(astate->config->dev, a, b, c);
  35
  36 #define alt_malloc(a)   kzalloc(a, GFP_KERNEL);
  37
  38 /*
  39  * This structure shows, for each JTAG state, which state is reached after
  40  * a single TCK clock cycle with TMS high or TMS low, respectively.  This
  41  * describes all possible state transitions in the JTAG state machine.
  42  */
  43 struct altera_jtag_machine {
  44         enum altera_jtag_state tms_high;
  45         enum altera_jtag_state tms_low;
  46 };
  47
  48 static const struct altera_jtag_machine altera_transitions[] = {
  49         /* RESET     */ { RESET,        IDLE },
  50         /* IDLE      */ { DRSELECT,     IDLE },
  51         /* DRSELECT  */ { IRSELECT,     DRCAPTURE },
  52         /* DRCAPTURE */ { DREXIT1,      DRSHIFT },
  53         /* DRSHIFT   */ { DREXIT1,      DRSHIFT },
  54         /* DREXIT1   */ { DRUPDATE,     DRPAUSE },
  55         /* DRPAUSE   */ { DREXIT2,      DRPAUSE },
  56         /* DREXIT2   */ { DRUPDATE,     DRSHIFT },
  57         /* DRUPDATE  */ { DRSELECT,     IDLE },
  58         /* IRSELECT  */ { RESET,        IRCAPTURE },
  59         /* IRCAPTURE */ { IREXIT1,      IRSHIFT },
  60         /* IRSHIFT   */ { IREXIT1,      IRSHIFT },
  61         /* IREXIT1   */ { IRUPDATE,     IRPAUSE },
  62         /* IRPAUSE   */ { IREXIT2,      IRPAUSE },
  63         /* IREXIT2   */ { IRUPDATE,     IRSHIFT },
  64         /* IRUPDATE  */ { DRSELECT,     IDLE }
  65 };
  66
  67 /*
  68  * This table contains the TMS value to be used to take the NEXT STEP on
  69  * the path to the desired state.  The array index is the current state,
  70  * and the bit position is the desired endstate.  To find out which state
  71  * is used as the intermediate state, look up the TMS value in the
  72  * altera_transitions[] table.
  73  */
  74 static const u16 altera_jtag_path_map[16] = {
  75         /* RST  RTI     SDRS    CDR     SDR     E1DR    PDR     E2DR */
  76         0x0001, 0xFFFD, 0xFE01, 0xFFE7, 0xFFEF, 0xFF0F, 0xFFBF, 0xFFFF,
  77         /* UDR  SIRS    CIR     SIR     E1IR    PIR     E2IR    UIR */
  78         0xFEFD, 0x0001, 0xF3FF, 0xF7FF, 0x87FF, 0xDFFF, 0xFFFF, 0x7FFD
  79 };
  80
  81 /* Flag bits for alt_jtag_io() function */
  82 #define TMS_HIGH   1
  83 #define TMS_LOW    0
  84 #define TDI_HIGH   1
  85 #define TDI_LOW    0
  86 #define READ_TDO   1
  87 #define IGNORE_TDO 0
  88
  89 int altera_jinit(struct altera_state *astate)
  90 {
  91         struct altera_jtag *js = &astate->js;
  92
  93         /* initial JTAG state is unknown */
  94         js->jtag_state = ILLEGAL_JTAG_STATE;
  95
  96         /* initialize to default state */
  97         js->drstop_state = IDLE;
  98         js->irstop_state = IDLE;
  99         js->dr_pre  = 0;
 100         js->dr_post = 0;
 101         js->ir_pre  = 0;
 102         js->ir_post = 0;
 103         js->dr_length    = 0;
 104         js->ir_length    = 0;
 105
 106         js->dr_pre_data  = NULL;
 107         js->dr_post_data = NULL;
 108         js->ir_pre_data  = NULL;
 109         js->ir_post_data = NULL;
 110         js->dr_buffer    = NULL;
 111         js->ir_buffer    = NULL;
 112
 113         return 0;
 114 }
 115
 116 int altera_set_drstop(struct altera_jtag *js, enum altera_jtag_state state)
 117 {
 118         js->drstop_state = state;
 119
 120         return 0;
 121 }
 122
 123 int altera_set_irstop(struct altera_jtag *js, enum altera_jtag_state state)
 124 {
 125         js->irstop_state = state;
 126
 127         return 0;
 128 }
 129
 130 int altera_set_dr_pre(struct altera_jtag *js,
 131                                 u32 count, u32 start_index,
 132                                 u8 *preamble_data)
 133 {
 134         int status = 0;
 135         u32 i;
 136         u32 j;
 137
 138         if (count > js->dr_pre) {
 139                 kfree(js->dr_pre_data);
 140                 js->dr_pre_data = (u8 *)alt_malloc((count + 7) >> 3);
 141                 if (js->dr_pre_data == NULL)
 142                         status = -ENOMEM;
 143                 else
 144                         js->dr_pre = count;
 145         } else
 146                 js->dr_pre = count;
 147
 148         if (status == 0) {
 149                 for (i = 0; i < count; ++i) {
 150                         j = i + start_index;
 151
 152                         if (preamble_data == NULL)
 153                                 js->dr_pre_data[i >> 3] |= (1 << (i & 7));
 154                         else {
 155                                 if (preamble_data[j >> 3] & (1 << (j & 7)))
 156                                         js->dr_pre_data[i >> 3] |=
 157                                                         (1 << (i & 7));
 158                                 else
 159                                         js->dr_pre_data[i >> 3] &=
 160                                                         ~(u32)(1 << (i & 7));
 161
 162                         }
 163                 }
 164         }
 165
 166         return status;
 167 }
 168
 169 int altera_set_ir_pre(struct altera_jtag *js, u32 count, u32 start_index,
 170                                                         u8 *preamble_data)
 171 {
 172         int status = 0;
 173         u32 i;
 174         u32 j;
 175
 176         if (count > js->ir_pre) {
 177                 kfree(js->ir_pre_data);
 178                 js->ir_pre_data = (u8 *)alt_malloc((count + 7) >> 3);
 179                 if (js->ir_pre_data == NULL)
 180                         status = -ENOMEM;
 181                 else
 182                         js->ir_pre = count;
 183
 184         } else
 185                 js->ir_pre = count;
 186
 187         if (status == 0) {
 188                 for (i = 0; i < count; ++i) {
 189                         j = i + start_index;
 190                         if (preamble_data == NULL)
 191                                 js->ir_pre_data[i >> 3] |= (1 << (i & 7));
 192                         else {
 193                                 if (preamble_data[j >> 3] & (1 << (j & 7)))
 194                                         js->ir_pre_data[i >> 3] |=
 195                                                         (1 << (i & 7));
 196                                 else
 197                                         js->ir_pre_data[i >> 3] &=
 198                                                         ~(u32)(1 << (i & 7));
 199
 200                         }
 201                 }
 202         }
 203
 204         return status;
 205 }
 206
 207 int altera_set_dr_post(struct altera_jtag *js, u32 count, u32 start_index,
 208                                                 u8 *postamble_data)
 209 {
 210         int status = 0;
 211         u32 i;
 212         u32 j;
 213
 214         if (count > js->dr_post) {
 215                 kfree(js->dr_post_data);
 216                 js->dr_post_data = (u8 *)alt_malloc((count + 7) >> 3);
 217
 218                 if (js->dr_post_data == NULL)
 219                         status = -ENOMEM;
 220                 else
 221                         js->dr_post = count;
 222
 223         } else
 224                 js->dr_post = count;
 225
 226         if (status == 0) {
 227                 for (i = 0; i < count; ++i) {
 228                         j = i + start_index;
 229
 230                         if (postamble_data == NULL)
 231                                 js->dr_post_data[i >> 3] |= (1 << (i & 7));
 232                         else {
 233                                 if (postamble_data[j >> 3] & (1 << (j & 7)))
 234                                         js->dr_post_data[i >> 3] |=
 235                                                                 (1 << (i & 7));
 236                                 else
 237                                         js->dr_post_data[i >> 3] &=
 238                                             ~(u32)(1 << (i & 7));
 239
 240                         }
 241                 }
 242         }
 243
 244         return status;
 245 }
 246
 247 int altera_set_ir_post(struct altera_jtag *js, u32 count, u32 start_index,
 248                                                 u8 *postamble_data)
 249 {
 250         int status = 0;
 251         u32 i;
 252         u32 j;
 253
 254         if (count > js->ir_post) {
 255                 kfree(js->ir_post_data);
 256                 js->ir_post_data = (u8 *)alt_malloc((count + 7) >> 3);
 257                 if (js->ir_post_data == NULL)
 258                         status = -ENOMEM;
 259                 else
 260                         js->ir_post = count;
 261
 262         } else
 263                 js->ir_post = count;
 264
 265         if (status != 0)
 266                 return status;
 267
 268         for (i = 0; i < count; ++i) {
 269                 j = i + start_index;
 270
 271                 if (postamble_data == NULL)
 272                         js->ir_post_data[i >> 3] |= (1 << (i & 7));
 273                 else {
 274                         if (postamble_data[j >> 3] & (1 << (j & 7)))
 275                                 js->ir_post_data[i >> 3] |= (1 << (i & 7));
 276                         else
 277                                 js->ir_post_data[i >> 3] &=
 278                                     ~(u32)(1 << (i & 7));
 279
 280                 }
 281         }
 282
 283         return status;
 284 }
 285
 286 static void altera_jreset_idle(struct altera_state *astate)
 287 {
 288         struct altera_jtag *js = &astate->js;
 289         int i;
 290         /* Go to Test Logic Reset (no matter what the starting state may be) */
 291         for (i = 0; i < 5; ++i)
 292                 alt_jtag_io(TMS_HIGH, TDI_LOW, IGNORE_TDO);
 293
 294         /* Now step to Run Test / Idle */
 295         alt_jtag_io(TMS_LOW, TDI_LOW, IGNORE_TDO);
 296         js->jtag_state = IDLE;
 297 }
 298
 299 int altera_goto_jstate(struct altera_state *astate,
 300                                         enum altera_jtag_state state)
 301 {
 302         struct altera_jtag *js = &astate->js;
 303         int tms;
 304         int count = 0;
 305         int status = 0;
 306
 307         if (js->jtag_state == ILLEGAL_JTAG_STATE)
 308                 /* initialize JTAG chain to known state */
 309                 altera_jreset_idle(astate);
 310
 311         if (js->jtag_state == state) {
 312                 /*
 313                  * We are already in the desired state.
 314                  * If it is a stable state, loop here.
 315                  * Otherwise do nothing (no clock cycles).
 316                  */
 317                 if ((state == IDLE) || (state == DRSHIFT) ||
 318                         (state == DRPAUSE) || (state == IRSHIFT) ||
 319                                 (state == IRPAUSE)) {
 320                         alt_jtag_io(TMS_LOW, TDI_LOW, IGNORE_TDO);
 321                 } else if (state == RESET)
 322                         alt_jtag_io(TMS_HIGH, TDI_LOW, IGNORE_TDO);
 323
 324         } else {
 325                 while ((js->jtag_state != state) && (count < 9)) {
 326                         /* Get TMS value to take a step toward desired state */
 327                         tms = (altera_jtag_path_map[js->jtag_state] &
 328                                                         (1 << state))
 329                                                         ? TMS_HIGH : TMS_LOW;
 330
 331                         /* Take a step */
 332                         alt_jtag_io(tms, TDI_LOW, IGNORE_TDO);
 333
 334                         if (tms)
 335                                 js->jtag_state =
 336                                         altera_transitions[js->jtag_state].tms_high;
 337                         else
 338                                 js->jtag_state =
 339                                         altera_transitions[js->jtag_state].tms_low;
 340
 341                         ++count;
 342                 }
 343         }
 344
 345         if (js->jtag_state != state)
 346                 status = -EREMOTEIO;
 347
 348         return status;
 349 }
 350
 351 int altera_wait_cycles(struct altera_state *astate,
 352                                         s32 cycles,
 353                                         enum altera_jtag_state wait_state)
 354 {
 355         struct altera_jtag *js = &astate->js;
 356         int tms;
 357         s32 count;
 358         int status = 0;
 359
 360         if (js->jtag_state != wait_state)
 361                 status = altera_goto_jstate(astate, wait_state);
 362
 363         if (status == 0) {
 364                 /*
 365                  * Set TMS high to loop in RESET state
 366                  * Set TMS low to loop in any other stable state
 367                  */
 368                 tms = (wait_state == RESET) ? TMS_HIGH : TMS_LOW;
 369
 370                 for (count = 0L; count < cycles; count++)
 371                         alt_jtag_io(tms, TDI_LOW, IGNORE_TDO);
 372
 373         }
 374
 375         return status;
 376 }
 377
 378 int altera_wait_msecs(struct altera_state *astate,
 379                         s32 microseconds, enum altera_jtag_state wait_state)
 380 /*
 381  * Causes JTAG hardware to sit in the specified stable
 382  * state for the specified duration of real time.  If
 383  * no JTAG operations have been performed yet, then only
 384  * a delay is performed.  This permits the WAIT USECS
 385  * statement to be used in VECTOR programs without causing
 386  * any JTAG operations.
 387  * Returns 0 for success, else appropriate error code.
 388  */
 389 {
 390         struct altera_jtag *js = &astate->js;
 391         int status = 0;
 392
 393         if ((js->jtag_state != ILLEGAL_JTAG_STATE) &&
 394             (js->jtag_state != wait_state))
 395                 status = altera_goto_jstate(astate, wait_state);
 396
 397         if (status == 0)
 398                 /* Wait for specified time interval */
 399                 udelay(microseconds);
 400
 401         return status;
 402 }
 403
 404 static void altera_concatenate_data(u8 *buffer,
 405                                 u8 *preamble_data,
 406                                 u32 preamble_count,
 407                                 u8 *target_data,
 408                                 u32 start_index,
 409                                 u32 target_count,
 410                                 u8 *postamble_data,
 411                                 u32 postamble_count)
 412 /*
 413  * Copies preamble data, target data, and postamble data
 414  * into one buffer for IR or DR scans.
 415  */
 416 {
 417         u32 i, j, k;
 418
 419         for (i = 0L; i < preamble_count; ++i) {
 420                 if (preamble_data[i >> 3L] & (1L << (i & 7L)))
 421                         buffer[i >> 3L] |= (1L << (i & 7L));
 422                 else
 423                         buffer[i >> 3L] &= ~(u32)(1L << (i & 7L));
 424
 425         }
 426
 427         j = start_index;
 428         k = preamble_count + target_count;
 429         for (; i < k; ++i, ++j) {
 430                 if (target_data[j >> 3L] & (1L << (j & 7L)))
 431                         buffer[i >> 3L] |= (1L << (i & 7L));
 432                 else
 433                         buffer[i >> 3L] &= ~(u32)(1L << (i & 7L));
 434
 435         }
 436
 437         j = 0L;
 438         k = preamble_count + target_count + postamble_count;
 439         for (; i < k; ++i, ++j) {
 440                 if (postamble_data[j >> 3L] & (1L << (j & 7L)))
 441                         buffer[i >> 3L] |= (1L << (i & 7L));
 442                 else
 443                         buffer[i >> 3L] &= ~(u32)(1L << (i & 7L));
 444
 445         }
 446 }
 447
 448 static int alt_jtag_drscan(struct altera_state *astate,
 449                         int start_state,
 450                         int count,
 451                         u8 *tdi,
 452                         u8 *tdo)
 453 {
 454         int i = 0;
 455         int tdo_bit = 0;
 456         int status = 1;
 457
 458         /* First go to DRSHIFT state */
 459         switch (start_state) {
 460         case 0:                                         /* IDLE */
 461                 alt_jtag_io(1, 0, 0);   /* DRSELECT */
 462                 alt_jtag_io(0, 0, 0);   /* DRCAPTURE */
 463                 alt_jtag_io(0, 0, 0);   /* DRSHIFT */
 464                 break;
 465
 466         case 1:                                         /* DRPAUSE */
 467                 alt_jtag_io(1, 0, 0);   /* DREXIT2 */
 468                 alt_jtag_io(1, 0, 0);   /* DRUPDATE */
 469                 alt_jtag_io(1, 0, 0);   /* DRSELECT */
 470                 alt_jtag_io(0, 0, 0);   /* DRCAPTURE */
 471                 alt_jtag_io(0, 0, 0);   /* DRSHIFT */
 472                 break;
 473
 474         case 2:                                         /* IRPAUSE */
 475                 alt_jtag_io(1, 0, 0);   /* IREXIT2 */
 476                 alt_jtag_io(1, 0, 0);   /* IRUPDATE */
 477                 alt_jtag_io(1, 0, 0);   /* DRSELECT */
 478                 alt_jtag_io(0, 0, 0);   /* DRCAPTURE */
 479                 alt_jtag_io(0, 0, 0);   /* DRSHIFT */
 480                 break;
 481
 482         default:
 483                 status = 0;
 484         }
 485
 486         if (status) {
 487                 /* loop in the SHIFT-DR state */
 488                 for (i = 0; i < count; i++) {
 489                         tdo_bit = alt_jtag_io(
 490                                         (i == count - 1),
 491                                         tdi[i >> 3] & (1 << (i & 7)),
 492                                         (tdo != NULL));
 493
 494                         if (tdo != NULL) {
 495                                 if (tdo_bit)
 496                                         tdo[i >> 3] |= (1 << (i & 7));
 497                                 else
 498                                         tdo[i >> 3] &= ~(u32)(1 << (i & 7));
 499
 500                         }
 501                 }
 502
 503                 alt_jtag_io(0, 0, 0);   /* DRPAUSE */
 504         }
 505
 506         return status;
 507 }
 508
 509 static int alt_jtag_irscan(struct altera_state *astate,
 510                     int start_state,
 511                     int count,
 512                     u8 *tdi,
 513                     u8 *tdo)
 514 {
 515         int i = 0;
 516         int tdo_bit = 0;
 517         int status = 1;
 518
 519         /* First go to IRSHIFT state */
 520         switch (start_state) {
 521         case 0:                                         /* IDLE */
 522                 alt_jtag_io(1, 0, 0);   /* DRSELECT */
 523                 alt_jtag_io(1, 0, 0);   /* IRSELECT */
 524                 alt_jtag_io(0, 0, 0);   /* IRCAPTURE */
 525                 alt_jtag_io(0, 0, 0);   /* IRSHIFT */
 526                 break;
 527
 528         case 1:                                         /* DRPAUSE */
 529                 alt_jtag_io(1, 0, 0);   /* DREXIT2 */
 530                 alt_jtag_io(1, 0, 0);   /* DRUPDATE */
 531                 alt_jtag_io(1, 0, 0);   /* DRSELECT */
 532                 alt_jtag_io(1, 0, 0);   /* IRSELECT */
 533                 alt_jtag_io(0, 0, 0);   /* IRCAPTURE */
 534                 alt_jtag_io(0, 0, 0);   /* IRSHIFT */
 535                 break;
 536
 537         case 2:                                         /* IRPAUSE */
 538                 alt_jtag_io(1, 0, 0);   /* IREXIT2 */
 539                 alt_jtag_io(1, 0, 0);   /* IRUPDATE */
 540                 alt_jtag_io(1, 0, 0);   /* DRSELECT */
 541                 alt_jtag_io(1, 0, 0);   /* IRSELECT */
 542                 alt_jtag_io(0, 0, 0);   /* IRCAPTURE */
 543                 alt_jtag_io(0, 0, 0);   /* IRSHIFT */
 544                 break;
 545
 546         default:
 547                 status = 0;
 548         }
 549
 550         if (status) {
 551                 /* loop in the SHIFT-IR state */
 552                 for (i = 0; i < count; i++) {
 553                         tdo_bit = alt_jtag_io(
 554                                       (i == count - 1),
 555                                       tdi[i >> 3] & (1 << (i & 7)),
 556                                       (tdo != NULL));
 557                         if (tdo != NULL) {
 558                                 if (tdo_bit)
 559                                         tdo[i >> 3] |= (1 << (i & 7));
 560                                 else
 561                                         tdo[i >> 3] &= ~(u32)(1 << (i & 7));
 562
 563                         }
 564                 }
 565
 566                 alt_jtag_io(0, 0, 0);   /* IRPAUSE */
 567         }
 568
 569         return status;
 570 }
 571
 572 static void altera_extract_target_data(u8 *buffer,
 573                                 u8 *target_data,
 574                                 u32 start_index,
 575                                 u32 preamble_count,
 576                                 u32 target_count)
 577 /*
 578  * Copies target data from scan buffer, filtering out
 579  * preamble and postamble data.
 580  */
 581 {
 582         u32 i;
 583         u32 j;
 584         u32 k;
 585
 586         j = preamble_count;
 587         k = start_index + target_count;
 588         for (i = start_index; i < k; ++i, ++j) {
 589                 if (buffer[j >> 3] & (1 << (j & 7)))
 590                         target_data[i >> 3] |= (1 << (i & 7));
 591                 else
 592                         target_data[i >> 3] &= ~(u32)(1 << (i & 7));
 593
 594         }
 595 }
 596
 597 int altera_irscan(struct altera_state *astate,
 598                                 u32 count,
 599                                 u8 *tdi_data,
 600                                 u32 start_index)
 601 /* Shifts data into instruction register */
 602 {
 603         struct altera_jtag *js = &astate->js;
 604         int start_code = 0;
 605         u32 alloc_chars = 0;
 606         u32 shift_count = js->ir_pre + count + js->ir_post;
 607         int status = 0;
 608         enum altera_jtag_state start_state = ILLEGAL_JTAG_STATE;
 609
 610         switch (js->jtag_state) {
 611         case ILLEGAL_JTAG_STATE:
 612         case RESET:
 613         case IDLE:
 614                 start_code = 0;
 615                 start_state = IDLE;
 616                 break;
 617
 618         case DRSELECT:
 619         case DRCAPTURE:
 620         case DRSHIFT:
 621         case DREXIT1:
 622         case DRPAUSE:
 623         case DREXIT2:
 624         case DRUPDATE:
 625                 start_code = 1;
 626                 start_state = DRPAUSE;
 627                 break;
 628
 629         case IRSELECT:
 630         case IRCAPTURE:
 631         case IRSHIFT:
 632         case IREXIT1:
 633         case IRPAUSE:
 634         case IREXIT2:
 635         case IRUPDATE:
 636                 start_code = 2;
 637                 start_state = IRPAUSE;
 638                 break;
 639
 640         default:
 641                 status = -EREMOTEIO;
 642                 break;
 643         }
 644
 645         if (status == 0)
 646                 if (js->jtag_state != start_state)
 647                         status = altera_goto_jstate(astate, start_state);
 648
 649         if (status == 0) {
 650                 if (shift_count > js->ir_length) {
 651                         alloc_chars = (shift_count + 7) >> 3;
 652                         kfree(js->ir_buffer);
 653                         js->ir_buffer = (u8 *)alt_malloc(alloc_chars);
 654                         if (js->ir_buffer == NULL)
 655                                 status = -ENOMEM;
 656                         else
 657                                 js->ir_length = alloc_chars * 8;
 658
 659                 }
 660         }
 661
 662         if (status == 0) {
 663                 /*
 664                  * Copy preamble data, IR data,
 665                  * and postamble data into a buffer
 666                  */
 667                 altera_concatenate_data(js->ir_buffer,
 668                                         js->ir_pre_data,
 669                                         js->ir_pre,
 670                                         tdi_data,
 671                                         start_index,
 672                                         count,
 673                                         js->ir_post_data,
 674                                         js->ir_post);
 675                 /* Do the IRSCAN */
 676                 alt_jtag_irscan(astate,
 677                                 start_code,
 678                                 shift_count,
 679                                 js->ir_buffer,
 680                                 NULL);
 681
 682                 /* alt_jtag_irscan() always ends in IRPAUSE state */
 683                 js->jtag_state = IRPAUSE;
 684         }
 685
 686         if (status == 0)
 687                 if (js->irstop_state != IRPAUSE)
 688                         status = altera_goto_jstate(astate, js->irstop_state);
 689
 690
 691         return status;
 692 }
 693
 694 int altera_swap_ir(struct altera_state *astate,
 695                             u32 count,
 696                             u8 *in_data,
 697                             u32 in_index,
 698                             u8 *out_data,
 699                             u32 out_index)
 700 /* Shifts data into instruction register, capturing output data */
 701 {
 702         struct altera_jtag *js = &astate->js;
 703         int start_code = 0;
 704         u32 alloc_chars = 0;
 705         u32 shift_count = js->ir_pre + count + js->ir_post;
 706         int status = 0;
 707         enum altera_jtag_state start_state = ILLEGAL_JTAG_STATE;
 708
 709         switch (js->jtag_state) {
 710         case ILLEGAL_JTAG_STATE:
 711         case RESET:
 712         case IDLE:
 713                 start_code = 0;
 714                 start_state = IDLE;
 715                 break;
 716
 717         case DRSELECT:
 718         case DRCAPTURE:
 719         case DRSHIFT:
 720         case DREXIT1:
 721         case DRPAUSE:
 722         case DREXIT2:
 723         case DRUPDATE:
 724                 start_code = 1;
 725                 start_state = DRPAUSE;
 726                 break;
 727
 728         case IRSELECT:
 729         case IRCAPTURE:
 730         case IRSHIFT:
 731         case IREXIT1:
 732         case IRPAUSE:
 733         case IREXIT2:
 734         case IRUPDATE:
 735                 start_code = 2;
 736                 start_state = IRPAUSE;
 737                 break;
 738
 739         default:
 740                 status = -EREMOTEIO;
 741                 break;
 742         }
 743
 744         if (status == 0)
 745                 if (js->jtag_state != start_state)
 746                         status = altera_goto_jstate(astate, start_state);
 747
 748         if (status == 0) {
 749                 if (shift_count > js->ir_length) {
 750                         alloc_chars = (shift_count + 7) >> 3;
 751                         kfree(js->ir_buffer);
 752                         js->ir_buffer = (u8 *)alt_malloc(alloc_chars);
 753                         if (js->ir_buffer == NULL)
 754                                 status = -ENOMEM;
 755                         else
 756                                 js->ir_length = alloc_chars * 8;
 757
 758                 }
 759         }
 760
 761         if (status == 0) {
 762                 /*
 763                  * Copy preamble data, IR data,
 764                  * and postamble data into a buffer
 765                  */
 766                 altera_concatenate_data(js->ir_buffer,
 767                                         js->ir_pre_data,
 768                                         js->ir_pre,
 769                                         in_data,
 770                                         in_index,
 771                                         count,
 772                                         js->ir_post_data,
 773                                         js->ir_post);
 774
 775                 /* Do the IRSCAN */
 776                 alt_jtag_irscan(astate,
 777                                 start_code,
 778                                 shift_count,
 779                                 js->ir_buffer,
 780                                 js->ir_buffer);
 781
 782                 /* alt_jtag_irscan() always ends in IRPAUSE state */
 783                 js->jtag_state = IRPAUSE;
 784         }
 785
 786         if (status == 0)
 787                 if (js->irstop_state != IRPAUSE)
 788                         status = altera_goto_jstate(astate, js->irstop_state);
 789
 790
 791         if (status == 0)
 792                 /* Now extract the returned data from the buffer */
 793                 altera_extract_target_data(js->ir_buffer,
 794                                         out_data, out_index,
 795                                         js->ir_pre, count);
 796
 797         return status;
 798 }
 799
 800 int altera_drscan(struct altera_state *astate,
 801                                 u32 count,
 802                                 u8 *tdi_data,
 803                                 u32 start_index)
 804 /* Shifts data into data register (ignoring output data) */
 805 {
 806         struct altera_jtag *js = &astate->js;
 807         int start_code = 0;
 808         u32 alloc_chars = 0;
 809         u32 shift_count = js->dr_pre + count + js->dr_post;
 810         int status = 0;
 811         enum altera_jtag_state start_state = ILLEGAL_JTAG_STATE;
 812
 813         switch (js->jtag_state) {
 814         case ILLEGAL_JTAG_STATE:
 815         case RESET:
 816         case IDLE:
 817                 start_code = 0;
 818                 start_state = IDLE;
 819                 break;
 820
 821         case DRSELECT:
 822         case DRCAPTURE:
 823         case DRSHIFT:
 824         case DREXIT1:
 825         case DRPAUSE:
 826         case DREXIT2:
 827         case DRUPDATE:
 828                 start_code = 1;
 829                 start_state = DRPAUSE;
 830                 break;
 831
 832         case IRSELECT:
 833         case IRCAPTURE:
 834         case IRSHIFT:
 835         case IREXIT1:
 836         case IRPAUSE:
 837         case IREXIT2:
 838         case IRUPDATE:
 839                 start_code = 2;
 840                 start_state = IRPAUSE;
 841                 break;
 842
 843         default:
 844                 status = -EREMOTEIO;
 845                 break;
 846         }
 847
 848         if (status == 0)
 849                 if (js->jtag_state != start_state)
 850                         status = altera_goto_jstate(astate, start_state);
 851
 852         if (status == 0) {
 853                 if (shift_count > js->dr_length) {
 854                         alloc_chars = (shift_count + 7) >> 3;
 855                         kfree(js->dr_buffer);
 856                         js->dr_buffer = (u8 *)alt_malloc(alloc_chars);
 857                         if (js->dr_buffer == NULL)
 858                                 status = -ENOMEM;
 859                         else
 860                                 js->dr_length = alloc_chars * 8;
 861
 862                 }
 863         }
 864
 865         if (status == 0) {
 866                 /*
 867                  * Copy preamble data, DR data,
 868                  * and postamble data into a buffer
 869                  */
 870                 altera_concatenate_data(js->dr_buffer,
 871                                         js->dr_pre_data,
 872                                         js->dr_pre,
 873                                         tdi_data,
 874                                         start_index,
 875                                         count,
 876                                         js->dr_post_data,
 877                                         js->dr_post);
 878                 /* Do the DRSCAN */
 879                 alt_jtag_drscan(astate, start_code, shift_count,
 880                                 js->dr_buffer, NULL);
 881                 /* alt_jtag_drscan() always ends in DRPAUSE state */
 882                 js->jtag_state = DRPAUSE;
 883         }
 884
 885         if (status == 0)
 886                 if (js->drstop_state != DRPAUSE)
 887                         status = altera_goto_jstate(astate, js->drstop_state);
 888
 889         return status;
 890 }
 891
 892 int altera_swap_dr(struct altera_state *astate, u32 count,
 893                                 u8 *in_data, u32 in_index,
 894                                 u8 *out_data, u32 out_index)
 895 /* Shifts data into data register, capturing output data */
 896 {
 897         struct altera_jtag *js = &astate->js;
 898         int start_code = 0;
 899         u32 alloc_chars = 0;
 900         u32 shift_count = js->dr_pre + count + js->dr_post;
 901         int status = 0;
 902         enum altera_jtag_state start_state = ILLEGAL_JTAG_STATE;
 903
 904         switch (js->jtag_state) {
 905         case ILLEGAL_JTAG_STATE:
 906         case RESET:
 907         case IDLE:
 908                 start_code = 0;
 909                 start_state = IDLE;
 910                 break;
 911
 912         case DRSELECT:
 913         case DRCAPTURE:
 914         case DRSHIFT:
 915         case DREXIT1:
 916         case DRPAUSE:
 917         case DREXIT2:
 918         case DRUPDATE:
 919                 start_code = 1;
 920                 start_state = DRPAUSE;
 921                 break;
 922
 923         case IRSELECT:
 924         case IRCAPTURE:
 925         case IRSHIFT:
 926         case IREXIT1:
 927         case IRPAUSE:
 928         case IREXIT2:
 929         case IRUPDATE:
 930                 start_code = 2;
 931                 start_state = IRPAUSE;
 932                 break;
 933
 934         default:
 935                 status = -EREMOTEIO;
 936                 break;
 937         }
 938
 939         if (status == 0)
 940                 if (js->jtag_state != start_state)
 941                         status = altera_goto_jstate(astate, start_state);
 942
 943         if (status == 0) {
 944                 if (shift_count > js->dr_length) {
 945                         alloc_chars = (shift_count + 7) >> 3;
 946                         kfree(js->dr_buffer);
 947                         js->dr_buffer = (u8 *)alt_malloc(alloc_chars);
 948
 949                         if (js->dr_buffer == NULL)
 950                                 status = -ENOMEM;
 951                         else
 952                                 js->dr_length = alloc_chars * 8;
 953
 954                 }
 955         }
 956
 957         if (status == 0) {
 958                 /*
 959                  * Copy preamble data, DR data,
 960                  * and postamble data into a buffer
 961                  */
 962                 altera_concatenate_data(js->dr_buffer,
 963                                 js->dr_pre_data,
 964                                 js->dr_pre,
 965                                 in_data,
 966                                 in_index,
 967                                 count,
 968                                 js->dr_post_data,
 969                                 js->dr_post);
 970
 971                 /* Do the DRSCAN */
 972                 alt_jtag_drscan(astate,
 973                                 start_code,
 974                                 shift_count,
 975                                 js->dr_buffer,
 976                                 js->dr_buffer);
 977
 978                 /* alt_jtag_drscan() always ends in DRPAUSE state */
 979                 js->jtag_state = DRPAUSE;
 980         }
 981
 982         if (status == 0)
 983                 if (js->drstop_state != DRPAUSE)
 984                         status = altera_goto_jstate(astate, js->drstop_state);
 985
 986         if (status == 0)
 987                 /* Now extract the returned data from the buffer */
 988                 altera_extract_target_data(js->dr_buffer,
 989                                         out_data,
 990                                         out_index,
 991                                         js->dr_pre,
 992                                         count);
 993
 994         return status;
 995 }
 996
 997 void altera_free_buffers(struct altera_state *astate)
 998 {
 999         struct altera_jtag *js = &astate->js;
1000         /* If the JTAG interface was used, reset it to TLR */
1001         if (js->jtag_state != ILLEGAL_JTAG_STATE)
1002                 altera_jreset_idle(astate);
1003
1004         kfree(js->dr_pre_data);
1005         js->dr_pre_data = NULL;
1006
1007         kfree(js->dr_post_data);
1008         js->dr_post_data = NULL;
1009
1010         kfree(js->dr_buffer);
1011         js->dr_buffer = NULL;
1012
1013         kfree(js->ir_pre_data);
1014         js->ir_pre_data = NULL;
1015
1016         kfree(js->ir_post_data);
1017         js->ir_post_data = NULL;
1018
1019         kfree(js->ir_buffer);
1020         js->ir_buffer = NULL;
1021 }