sound/soc/sh/rcar/src.c

   1 /*
   2  * Renesas R-Car SRC support
   3  *
   4  * Copyright (C) 2013 Renesas Solutions Corp.
   5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   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 version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include "rsnd.h"
  12
  13 struct rsnd_src {
  14         struct rsnd_src_platform_info *info; /* rcar_snd.h */
  15         struct rsnd_mod mod;
  16         struct clk *clk;
  17 };
  18
  19 #define RSND_SRC_NAME_SIZE 16
  20
  21 #define rsnd_src_convert_rate(p) ((p)->info->convert_rate)
  22 #define rsnd_mod_to_src(_mod)                           \
  23         container_of((_mod), struct rsnd_src, mod)
  24 #define rsnd_src_dma_available(src) \
  25         rsnd_dma_available(rsnd_mod_to_dma(&(src)->mod))
  26
  27 #define for_each_rsnd_src(pos, priv, i)                         \
  28         for ((i) = 0;                                           \
  29              ((i) < rsnd_src_nr(priv)) &&                       \
  30              ((pos) = (struct rsnd_src *)(priv)->src + i);      \
  31              i++)
  32
  33
  34 /*
  35  *              image of SRC (Sampling Rate Converter)
  36  *
  37  * 96kHz   <-> +-----+  48kHz   +-----+  48kHz  +-------+
  38  * 48kHz   <-> | SRC | <------> | SSI | <-----> | codec |
  39  * 44.1kHz <-> +-----+          +-----+         +-------+
  40  * ...
  41  *
  42  */
  43
  44 /*
  45  * src.c is caring...
  46  *
  47  * Gen1
  48  *
  49  * [mem] -> [SRU] -> [SSI]
  50  *        |--------|
  51  *
  52  * Gen2
  53  *
  54  * [mem] -> [SRC] -> [SSIU] -> [SSI]
  55  *        |-----------------|
  56  */
  57
  58 /*
  59  *      How to use SRC bypass mode for debugging
  60  *
  61  * SRC has bypass mode, and it is useful for debugging.
  62  * In Gen2 case,
  63  * SRCm_MODE controls whether SRC is used or not
  64  * SSI_MODE0 controls whether SSIU which receives SRC data
  65  * is used or not.
  66  * Both SRCm_MODE/SSI_MODE0 settings are needed if you use SRC,
  67  * but SRC bypass mode needs SSI_MODE0 only.
  68  *
  69  * This driver request
  70  * struct rsnd_src_platform_info {
  71  *      u32 convert_rate;
  72  *      int dma_id;
  73  * }
  74  *
  75  * rsnd_src_convert_rate() indicates
  76  * above convert_rate, and it controls
  77  * whether SRC is used or not.
  78  *
  79  * ex) doesn't use SRC
  80  * static struct rsnd_dai_platform_info rsnd_dai = {
  81  *      .playback = { .ssi = &rsnd_ssi[0], },
  82  * };
  83  *
  84  * ex) uses SRC
  85  * static struct rsnd_src_platform_info rsnd_src[] = {
  86  *      RSND_SCU(48000, 0),
  87  *      ...
  88  * };
  89  * static struct rsnd_dai_platform_info rsnd_dai = {
  90  *      .playback = { .ssi = &rsnd_ssi[0], .src = &rsnd_src[0] },
  91  * };
  92  *
  93  * ex) uses SRC bypass mode
  94  * static struct rsnd_src_platform_info rsnd_src[] = {
  95  *      RSND_SCU(0, 0),
  96  *      ...
  97  * };
  98  * static struct rsnd_dai_platform_info rsnd_dai = {
  99  *      .playback = { .ssi = &rsnd_ssi[0], .src = &rsnd_src[0] },
 100  * };
 101  *
 102  */
 103
 104 /*
 105  *              Gen1/Gen2 common functions
 106  */
 107 int rsnd_src_ssi_mode_init(struct rsnd_mod *ssi_mod,
 108                            struct rsnd_dai *rdai,
 109                            struct rsnd_dai_stream *io)
 110 {
 111         struct rsnd_mod *src_mod = rsnd_io_to_mod_src(io);
 112         int ssi_id = rsnd_mod_id(ssi_mod);
 113
 114         /*
 115          * SSI_MODE0
 116          */
 117         rsnd_mod_bset(ssi_mod, SSI_MODE0, (1 << ssi_id),
 118                       src_mod ? 0 : (1 << ssi_id));
 119
 120         /*
 121          * SSI_MODE1
 122          */
 123         if (rsnd_ssi_is_pin_sharing(ssi_mod)) {
 124                 int shift = -1;
 125                 switch (ssi_id) {
 126                 case 1:
 127                         shift = 0;
 128                         break;
 129                 case 2:
 130                         shift = 2;
 131                         break;
 132                 case 4:
 133                         shift = 16;
 134                         break;
 135                 }
 136
 137                 if (shift >= 0)
 138                         rsnd_mod_bset(ssi_mod, SSI_MODE1,
 139                                       0x3 << shift,
 140                                       rsnd_dai_is_clk_master(rdai) ?
 141                                       0x2 << shift : 0x1 << shift);
 142         }
 143
 144         return 0;
 145 }
 146
 147 int rsnd_src_enable_ssi_irq(struct rsnd_mod *ssi_mod,
 148                             struct rsnd_dai *rdai,
 149                             struct rsnd_dai_stream *io)
 150 {
 151         struct rsnd_priv *priv = rsnd_mod_to_priv(ssi_mod);
 152
 153         /* enable PIO interrupt if Gen2 */
 154         if (rsnd_is_gen2(priv))
 155                 rsnd_mod_write(ssi_mod, INT_ENABLE, 0x0f000000);
 156
 157         return 0;
 158 }
 159
 160 unsigned int rsnd_src_get_ssi_rate(struct rsnd_priv *priv,
 161                                    struct rsnd_dai_stream *io,
 162                                    struct snd_pcm_runtime *runtime)
 163 {
 164         struct rsnd_mod *src_mod = rsnd_io_to_mod_src(io);
 165         struct rsnd_src *src;
 166         unsigned int rate = 0;
 167
 168         if (src_mod) {
 169                 src = rsnd_mod_to_src(src_mod);
 170
 171                 /*
 172                  * return convert rate if SRC is used,
 173                  * otherwise, return runtime->rate as usual
 174                  */
 175                 rate = rsnd_src_convert_rate(src);
 176         }
 177
 178         if (!rate)
 179                 rate = runtime->rate;
 180
 181         return rate;
 182 }
 183
 184 static int rsnd_src_set_convert_rate(struct rsnd_mod *mod,
 185                                      struct rsnd_dai *rdai,
 186                                      struct rsnd_dai_stream *io)
 187 {
 188         struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 189         struct rsnd_src *src = rsnd_mod_to_src(mod);
 190         u32 convert_rate = rsnd_src_convert_rate(src);
 191         u32 fsrate = 0;
 192
 193         if (convert_rate)
 194                 fsrate = 0x0400000 / convert_rate * runtime->rate;
 195
 196         /* set/clear soft reset */
 197         rsnd_mod_write(mod, SRC_SWRSR, 0);
 198         rsnd_mod_write(mod, SRC_SWRSR, 1);
 199
 200         /*
 201          * Initialize the operation of the SRC internal circuits
 202          * see rsnd_src_start()
 203          */
 204         rsnd_mod_write(mod, SRC_SRCIR, 1);
 205
 206         /* Set channel number and output bit length */
 207         rsnd_mod_write(mod, SRC_ADINR, rsnd_get_adinr(mod));
 208
 209         /* Enable the initial value of IFS */
 210         if (fsrate) {
 211                 rsnd_mod_write(mod, SRC_IFSCR, 1);
 212
 213                 /* Set initial value of IFS */
 214                 rsnd_mod_write(mod, SRC_IFSVR, fsrate);
 215         }
 216
 217         /* use DMA transfer */
 218         rsnd_mod_write(mod, SRC_BUSIF_MODE, 1);
 219
 220         return 0;
 221 }
 222
 223 static int rsnd_src_init(struct rsnd_mod *mod,
 224                          struct rsnd_dai *rdai,
 225                          struct rsnd_dai_stream *io)
 226 {
 227         struct rsnd_src *src = rsnd_mod_to_src(mod);
 228
 229         clk_enable(src->clk);
 230
 231         return 0;
 232 }
 233
 234 static int rsnd_src_quit(struct rsnd_mod *mod,
 235                          struct rsnd_dai *rdai,
 236                          struct rsnd_dai_stream *io)
 237 {
 238         struct rsnd_src *src = rsnd_mod_to_src(mod);
 239
 240         clk_disable(src->clk);
 241
 242         return 0;
 243 }
 244
 245 static int rsnd_src_start(struct rsnd_mod *mod,
 246                           struct rsnd_dai *rdai,
 247                           struct rsnd_dai_stream *io)
 248 {
 249         struct rsnd_src *src = rsnd_mod_to_src(mod);
 250
 251         /*
 252          * Cancel the initialization and operate the SRC function
 253          * see rsnd_src_set_convert_rate()
 254          */
 255         rsnd_mod_write(mod, SRC_SRCIR, 0);
 256
 257         if (rsnd_src_convert_rate(src))
 258                 rsnd_mod_write(mod, SRC_ROUTE_MODE0, 1);
 259
 260         return 0;
 261 }
 262
 263
 264 static int rsnd_src_stop(struct rsnd_mod *mod,
 265                          struct rsnd_dai *rdai,
 266                          struct rsnd_dai_stream *io)
 267 {
 268         struct rsnd_src *src = rsnd_mod_to_src(mod);
 269
 270         if (rsnd_src_convert_rate(src))
 271                 rsnd_mod_write(mod, SRC_ROUTE_MODE0, 0);
 272
 273         return 0;
 274 }
 275
 276 static struct rsnd_mod_ops rsnd_src_non_ops = {
 277         .name   = "src (non)",
 278 };
 279
 280 /*
 281  *              Gen1 functions
 282  */
 283 static int rsnd_src_set_route_gen1(struct rsnd_mod *mod,
 284                                    struct rsnd_dai *rdai,
 285                                    struct rsnd_dai_stream *io)
 286 {
 287         struct src_route_config {
 288                 u32 mask;
 289                 int shift;
 290         } routes[] = {
 291                 { 0xF,  0, }, /* 0 */
 292                 { 0xF,  4, }, /* 1 */
 293                 { 0xF,  8, }, /* 2 */
 294                 { 0x7, 12, }, /* 3 */
 295                 { 0x7, 16, }, /* 4 */
 296                 { 0x7, 20, }, /* 5 */
 297                 { 0x7, 24, }, /* 6 */
 298                 { 0x3, 28, }, /* 7 */
 299                 { 0x3, 30, }, /* 8 */
 300         };
 301         u32 mask;
 302         u32 val;
 303         int id;
 304
 305         id = rsnd_mod_id(mod);
 306         if (id < 0 || id >= ARRAY_SIZE(routes))
 307                 return -EIO;
 308
 309         /*
 310          * SRC_ROUTE_SELECT
 311          */
 312         val = rsnd_dai_is_play(rdai, io) ? 0x1 : 0x2;
 313         val = val               << routes[id].shift;
 314         mask = routes[id].mask  << routes[id].shift;
 315
 316         rsnd_mod_bset(mod, SRC_ROUTE_SEL, mask, val);
 317
 318         return 0;
 319 }
 320
 321 static int rsnd_src_set_convert_timing_gen1(struct rsnd_mod *mod,
 322                                             struct rsnd_dai *rdai,
 323                                             struct rsnd_dai_stream *io)
 324 {
 325         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 326         struct rsnd_src *src = rsnd_mod_to_src(mod);
 327         struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 328         u32 convert_rate = rsnd_src_convert_rate(src);
 329         u32 mask;
 330         u32 val;
 331         int shift;
 332         int id = rsnd_mod_id(mod);
 333         int ret;
 334
 335         /*
 336          * SRC_TIMING_SELECT
 337          */
 338         shift   = (id % 4) * 8;
 339         mask    = 0x1F << shift;
 340
 341         /*
 342          * ADG is used as source clock if SRC was used,
 343          * then, SSI WS is used as destination clock.
 344          * SSI WS is used as source clock if SRC is not used
 345          * (when playback, source/destination become reverse when capture)
 346          */
 347         ret = 0;
 348         if (convert_rate) {
 349                 /* use ADG */
 350                 val = 0;
 351                 ret = rsnd_adg_set_convert_clk_gen1(priv, mod,
 352                                                     runtime->rate,
 353                                                     convert_rate);
 354         } else if (8 == id) {
 355                 /* use SSI WS, but SRU8 is special */
 356                 val = id << shift;
 357         } else {
 358                 /* use SSI WS */
 359                 val = (id + 1) << shift;
 360         }
 361
 362         if (ret < 0)
 363                 return ret;
 364
 365         switch (id / 4) {
 366         case 0:
 367                 rsnd_mod_bset(mod, SRC_TMG_SEL0, mask, val);
 368                 break;
 369         case 1:
 370                 rsnd_mod_bset(mod, SRC_TMG_SEL1, mask, val);
 371                 break;
 372         case 2:
 373                 rsnd_mod_bset(mod, SRC_TMG_SEL2, mask, val);
 374                 break;
 375         }
 376
 377         return 0;
 378 }
 379
 380 static int rsnd_src_set_convert_rate_gen1(struct rsnd_mod *mod,
 381                                           struct rsnd_dai *rdai,
 382                                           struct rsnd_dai_stream *io)
 383 {
 384         int ret;
 385
 386         ret = rsnd_src_set_convert_rate(mod, rdai, io);
 387         if (ret < 0)
 388                 return ret;
 389
 390         /* Select SRC mode (fixed value) */
 391         rsnd_mod_write(mod, SRC_SRCCR, 0x00010110);
 392
 393         /* Set the restriction value of the FS ratio (98%) */
 394         rsnd_mod_write(mod, SRC_MNFSR,
 395                        rsnd_mod_read(mod, SRC_IFSVR) / 100 * 98);
 396
 397         /* no SRC_BFSSR settings, since SRC_SRCCR::BUFMD is 0 */
 398
 399         return 0;
 400 }
 401
 402 static int rsnd_src_init_gen1(struct rsnd_mod *mod,
 403                               struct rsnd_dai *rdai,
 404                               struct rsnd_dai_stream *io)
 405 {
 406         int ret;
 407
 408         ret = rsnd_src_init(mod, rdai, io);
 409         if (ret < 0)
 410                 return ret;
 411
 412         ret = rsnd_src_set_route_gen1(mod, rdai, io);
 413         if (ret < 0)
 414                 return ret;
 415
 416         ret = rsnd_src_set_convert_rate_gen1(mod, rdai, io);
 417         if (ret < 0)
 418                 return ret;
 419
 420         ret = rsnd_src_set_convert_timing_gen1(mod, rdai, io);
 421         if (ret < 0)
 422                 return ret;
 423
 424         return 0;
 425 }
 426
 427 static int rsnd_src_start_gen1(struct rsnd_mod *mod,
 428                                struct rsnd_dai *rdai,
 429                                struct rsnd_dai_stream *io)
 430 {
 431         int id = rsnd_mod_id(mod);
 432
 433         rsnd_mod_bset(mod, SRC_ROUTE_CTRL, (1 << id), (1 << id));
 434
 435         return rsnd_src_start(mod, rdai, io);
 436 }
 437
 438 static int rsnd_src_stop_gen1(struct rsnd_mod *mod,
 439                               struct rsnd_dai *rdai,
 440                               struct rsnd_dai_stream *io)
 441 {
 442         int id = rsnd_mod_id(mod);
 443
 444         rsnd_mod_bset(mod, SRC_ROUTE_CTRL, (1 << id), 0);
 445
 446         return rsnd_src_stop(mod, rdai, io);
 447 }
 448
 449 static struct rsnd_mod_ops rsnd_src_gen1_ops = {
 450         .name   = "sru (gen1)",
 451         .init   = rsnd_src_init_gen1,
 452         .quit   = rsnd_src_quit,
 453         .start  = rsnd_src_start_gen1,
 454         .stop   = rsnd_src_stop_gen1,
 455 };
 456
 457 /*
 458  *              Gen2 functions
 459  */
 460 static int rsnd_src_set_convert_rate_gen2(struct rsnd_mod *mod,
 461                                           struct rsnd_dai *rdai,
 462                                           struct rsnd_dai_stream *io)
 463 {
 464         int ret;
 465
 466         ret = rsnd_src_set_convert_rate(mod, rdai, io);
 467         if (ret < 0)
 468                 return ret;
 469
 470         rsnd_mod_write(mod, SSI_BUSIF_ADINR, rsnd_get_adinr(mod));
 471         rsnd_mod_write(mod, SSI_BUSIF_MODE,  1);
 472
 473         rsnd_mod_write(mod, SRC_SRCCR, 0x00011110);
 474
 475         rsnd_mod_write(mod, SRC_BSDSR, 0x01800000);
 476         rsnd_mod_write(mod, SRC_BSISR, 0x00100060);
 477
 478         return 0;
 479 }
 480
 481 static int rsnd_src_set_convert_timing_gen2(struct rsnd_mod *mod,
 482                                             struct rsnd_dai *rdai,
 483                                             struct rsnd_dai_stream *io)
 484 {
 485         struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 486         struct rsnd_src *src = rsnd_mod_to_src(mod);
 487         u32 convert_rate = rsnd_src_convert_rate(src);
 488         int ret;
 489
 490         if (convert_rate)
 491                 ret = rsnd_adg_set_convert_clk_gen2(mod, rdai, io,
 492                                                     runtime->rate,
 493                                                     convert_rate);
 494         else
 495                 ret = rsnd_adg_set_convert_timing_gen2(mod, rdai, io);
 496
 497         return ret;
 498 }
 499
 500 static int rsnd_src_probe_gen2(struct rsnd_mod *mod,
 501                                struct rsnd_dai *rdai,
 502                                struct rsnd_dai_stream *io)
 503 {
 504         struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 505         struct rsnd_src *src = rsnd_mod_to_src(mod);
 506         struct device *dev = rsnd_priv_to_dev(priv);
 507         int ret;
 508
 509         ret = rsnd_dma_init(priv,
 510                             rsnd_mod_to_dma(mod),
 511                             rsnd_info_is_playback(priv, src),
 512                             src->info->dma_id);
 513         if (ret < 0)
 514                 dev_err(dev, "SRC DMA failed\n");
 515
 516         return ret;
 517 }
 518
 519 static int rsnd_src_remove_gen2(struct rsnd_mod *mod,
 520                                 struct rsnd_dai *rdai,
 521                                 struct rsnd_dai_stream *io)
 522 {
 523         rsnd_dma_quit(rsnd_mod_to_priv(mod), rsnd_mod_to_dma(mod));
 524
 525         return 0;
 526 }
 527
 528 static int rsnd_src_init_gen2(struct rsnd_mod *mod,
 529                               struct rsnd_dai *rdai,
 530                               struct rsnd_dai_stream *io)
 531 {
 532         int ret;
 533
 534         ret = rsnd_src_init(mod, rdai, io);
 535         if (ret < 0)
 536                 return ret;
 537
 538         ret = rsnd_src_set_convert_rate_gen2(mod, rdai, io);
 539         if (ret < 0)
 540                 return ret;
 541
 542         ret = rsnd_src_set_convert_timing_gen2(mod, rdai, io);
 543         if (ret < 0)
 544                 return ret;
 545
 546         return 0;
 547 }
 548
 549 static int rsnd_src_start_gen2(struct rsnd_mod *mod,
 550                                struct rsnd_dai *rdai,
 551                                struct rsnd_dai_stream *io)
 552 {
 553         struct rsnd_src *src = rsnd_mod_to_src(mod);
 554
 555         rsnd_dma_start(rsnd_mod_to_dma(&src->mod));
 556
 557         rsnd_mod_write(mod, SSI_CTRL, 0x1);
 558         rsnd_mod_write(mod, SRC_CTRL, 0x11);
 559
 560         return rsnd_src_start(mod, rdai, io);
 561 }
 562
 563 static int rsnd_src_stop_gen2(struct rsnd_mod *mod,
 564                               struct rsnd_dai *rdai,
 565                               struct rsnd_dai_stream *io)
 566 {
 567         struct rsnd_src *src = rsnd_mod_to_src(mod);
 568
 569         rsnd_mod_write(mod, SSI_CTRL, 0);
 570         rsnd_mod_write(mod, SRC_CTRL, 0);
 571
 572         rsnd_dma_stop(rsnd_mod_to_dma(&src->mod));
 573
 574         return rsnd_src_stop(mod, rdai, io);
 575 }
 576
 577 static struct rsnd_mod_ops rsnd_src_gen2_ops = {
 578         .name   = "src (gen2)",
 579         .probe  = rsnd_src_probe_gen2,
 580         .remove = rsnd_src_remove_gen2,
 581         .init   = rsnd_src_init_gen2,
 582         .quit   = rsnd_src_quit,
 583         .start  = rsnd_src_start_gen2,
 584         .stop   = rsnd_src_stop_gen2,
 585 };
 586
 587 struct rsnd_mod *rsnd_src_mod_get(struct rsnd_priv *priv, int id)
 588 {
 589         if (WARN_ON(id < 0 || id >= rsnd_src_nr(priv)))
 590                 id = 0;
 591
 592         return &((struct rsnd_src *)(priv->src) + id)->mod;
 593 }
 594
 595 static void rsnd_of_parse_src(struct platform_device *pdev,
 596                               const struct rsnd_of_data *of_data,
 597                               struct rsnd_priv *priv)
 598 {
 599         struct device_node *src_node;
 600         struct rcar_snd_info *info = rsnd_priv_to_info(priv);
 601         struct rsnd_src_platform_info *src_info;
 602         struct device *dev = &pdev->dev;
 603         int nr;
 604
 605         if (!of_data)
 606                 return;
 607
 608         src_node = of_get_child_by_name(dev->of_node, "rcar_sound,src");
 609         if (!src_node)
 610                 return;
 611
 612         nr = of_get_child_count(src_node);
 613         if (!nr)
 614                 return;
 615
 616         src_info = devm_kzalloc(dev,
 617                                 sizeof(struct rsnd_src_platform_info) * nr,
 618                                 GFP_KERNEL);
 619         if (!src_info) {
 620                 dev_err(dev, "src info allocation error\n");
 621                 return;
 622         }
 623
 624         info->src_info          = src_info;
 625         info->src_info_nr       = nr;
 626 }
 627
 628 int rsnd_src_probe(struct platform_device *pdev,
 629                    const struct rsnd_of_data *of_data,
 630                    struct rsnd_priv *priv)
 631 {
 632         struct rcar_snd_info *info = rsnd_priv_to_info(priv);
 633         struct device *dev = rsnd_priv_to_dev(priv);
 634         struct rsnd_src *src;
 635         struct rsnd_mod_ops *ops;
 636         struct clk *clk;
 637         char name[RSND_SRC_NAME_SIZE];
 638         int i, nr;
 639
 640         rsnd_of_parse_src(pdev, of_data, priv);
 641
 642         /*
 643          * init SRC
 644          */
 645         nr      = info->src_info_nr;
 646         if (!nr)
 647                 return 0;
 648
 649         src     = devm_kzalloc(dev, sizeof(*src) * nr, GFP_KERNEL);
 650         if (!src) {
 651                 dev_err(dev, "SRC allocate failed\n");
 652                 return -ENOMEM;
 653         }
 654
 655         priv->src_nr    = nr;
 656         priv->src       = src;
 657
 658         for_each_rsnd_src(src, priv, i) {
 659                 snprintf(name, RSND_SRC_NAME_SIZE, "src.%d", i);
 660
 661                 clk = devm_clk_get(dev, name);
 662                 if (IS_ERR(clk))
 663                         return PTR_ERR(clk);
 664
 665                 src->info = &info->src_info[i];
 666                 src->clk = clk;
 667
 668                 ops = &rsnd_src_non_ops;
 669                 if (rsnd_is_gen1(priv))
 670                         ops = &rsnd_src_gen1_ops;
 671                 if (rsnd_is_gen2(priv))
 672                         ops = &rsnd_src_gen2_ops;
 673
 674                 rsnd_mod_init(priv, &src->mod, ops, RSND_MOD_SRC, i);
 675
 676                 dev_dbg(dev, "SRC%d probed\n", i);
 677         }
 678
 679         return 0;
 680 }