git.oblomov.eu Git - linux-2.6/blob - sound/drivers/ml403-ac97cr.c

   1 /*
   2  * ALSA driver for Xilinx ML403 AC97 Controller Reference
   3  *   IP: opb_ac97_controller_ref_v1_00_a (EDK 8.1i)
   4  *   IP: opb_ac97_controller_ref_v1_00_a (EDK 9.1i)
   5  *
   6  *  Copyright (c) by 2007  Joachim Foerster <JOFT@gmx.de>
   7  *
   8  *   This program is free software; you can redistribute it and/or modify
   9  *   it under the terms of the GNU General Public License as published by
  10  *   the Free Software Foundation; either version 2 of the License, or
  11  *   (at your option) any later version.
  12  *
  13  *   This program is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with this program; if not, write to the Free Software
  20  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  21  *
  22  */
  23
  24 /* Some notes / status of this driver:
  25  *
  26  * - Don't wonder about some strange implementations of things - especially the
  27  * (heavy) shadowing of codec registers, with which I tried to reduce read
  28  * accesses to a minimum, because after a variable amount of accesses, the AC97
  29  * controller doesn't raise the register access finished bit anymore ...
  30  *
  31  * - Playback support seems to be pretty stable - no issues here.
  32  * - Capture support "works" now, too. Overruns don't happen any longer so often.
  33  *   But there might still be some ...
  34  */
  35
  36 #include <linux/init.h>
  37 #include <linux/moduleparam.h>
  38
  39 #include <linux/platform_device.h>
  40
  41 #include <linux/ioport.h>
  42 #include <linux/io.h>
  43 #include <linux/interrupt.h>
  44
  45 /* HZ */
  46 #include <linux/param.h>
  47 /* jiffies, time_*() */
  48 #include <linux/jiffies.h>
  49 /* schedule_timeout*() */
  50 #include <linux/sched.h>
  51 /* spin_lock*() */
  52 #include <linux/spinlock.h>
  53 /* struct mutex, mutex_init(), mutex_*lock() */
  54 #include <linux/mutex.h>
  55
  56 /* snd_printk(), snd_printd() */
  57 #include <sound/core.h>
  58 #include <sound/pcm.h>
  59 #include <sound/pcm_params.h>
  60 #include <sound/initval.h>
  61 #include <sound/ac97_codec.h>
  62
  63 #include "pcm-indirect2.h"
  64
  65
  66 #define SND_ML403_AC97CR_DRIVER "ml403-ac97cr"
  67
  68 MODULE_AUTHOR("Joachim Foerster <JOFT@gmx.de>");
  69 MODULE_DESCRIPTION("Xilinx ML403 AC97 Controller Reference");
  70 MODULE_LICENSE("GPL");
  71 MODULE_SUPPORTED_DEVICE("{{Xilinx,ML403 AC97 Controller Reference}}");
  72
  73 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  74 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
  75 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE;
  76
  77 module_param_array(index, int, NULL, 0444);
  78 MODULE_PARM_DESC(index, "Index value for ML403 AC97 Controller Reference.");
  79 module_param_array(id, charp, NULL, 0444);
  80 MODULE_PARM_DESC(id, "ID string for ML403 AC97 Controller Reference.");
  81 module_param_array(enable, bool, NULL, 0444);
  82 MODULE_PARM_DESC(enable, "Enable this ML403 AC97 Controller Reference.");
  83
  84 /* Special feature options */
  85 /*#define CODEC_WRITE_CHECK_RAF*/ /* don't return after a write to a codec
  86                                    * register, while RAF bit is not set
  87                                    */
  88 /* Debug options for code which may be removed completely in a final version */
  89 #ifdef CONFIG_SND_DEBUG
  90 /*#define CODEC_STAT*/            /* turn on some minimal "statistics"
  91                                    * about codec register usage
  92                                    */
  93 #define SND_PCM_INDIRECT2_STAT    /* turn on some "statistics" about the
  94                                    * process of copying bytes from the
  95                                    * intermediate buffer to the hardware
  96                                    * fifo and the other way round
  97                                    */
  98 #endif
  99
 100 /* Definition of a "level/facility dependent" printk(); may be removed
 101  * completely in a final version
 102  */
 103 #undef PDEBUG
 104 #ifdef CONFIG_SND_DEBUG
 105 /* "facilities" for PDEBUG */
 106 #define UNKNOWN       (1<<0)
 107 #define CODEC_SUCCESS (1<<1)
 108 #define CODEC_FAKE    (1<<2)
 109 #define INIT_INFO     (1<<3)
 110 #define INIT_FAILURE  (1<<4)
 111 #define WORK_INFO     (1<<5)
 112 #define WORK_FAILURE  (1<<6)
 113
 114 #define PDEBUG_FACILITIES (UNKNOWN | INIT_FAILURE | WORK_FAILURE)
 115
 116 #define PDEBUG(fac, fmt, args...) do { \
 117                 if (fac & PDEBUG_FACILITIES) \
 118                         snd_printd(KERN_DEBUG SND_ML403_AC97CR_DRIVER ": " \
 119                                    fmt, ##args); \
 120         } while (0)
 121 #else
 122 #define PDEBUG(fac, fmt, args...) /* nothing */
 123 #endif
 124
 125
 126
 127 /* Defines for "waits"/timeouts (portions of HZ=250 on arch/ppc by default) */
 128 #define CODEC_TIMEOUT_ON_INIT       5   /* timeout for checking for codec
 129                                          * readiness (after insmod)
 130                                          */
 131 #ifndef CODEC_WRITE_CHECK_RAF
 132 #define CODEC_WAIT_AFTER_WRITE    100   /* general, static wait after a write
 133                                          * access to a codec register, may be
 134                                          * 0 to completely remove wait
 135                                          */
 136 #else
 137 #define CODEC_TIMEOUT_AFTER_WRITE   5   /* timeout after a write access to a
 138                                          * codec register, if RAF bit is used
 139                                          */
 140 #endif
 141 #define CODEC_TIMEOUT_AFTER_READ    5   /* timeout after a read access to a
 142                                          * codec register (checking RAF bit)
 143                                          */
 144
 145 /* Infrastructure for codec register shadowing */
 146 #define LM4550_REG_OK        (1<<0)   /* register exists */
 147 #define LM4550_REG_DONEREAD  (1<<1)   /* read register once, value should be
 148                                        * the same currently in the register
 149                                        */
 150 #define LM4550_REG_NOSAVE    (1<<2)   /* values written to this register will
 151                                        * not be saved in the register
 152                                        */
 153 #define LM4550_REG_NOSHADOW  (1<<3)   /* don't do register shadowing, use plain
 154                                        * hardware access
 155                                        */
 156 #define LM4550_REG_READONLY  (1<<4)   /* register is read only */
 157 #define LM4550_REG_FAKEPROBE (1<<5)   /* fake write _and_ read actions during
 158                                        * probe() correctly
 159                                        */
 160 #define LM4550_REG_FAKEREAD  (1<<6)   /* fake read access, always return
 161                                        * default value
 162                                        */
 163 #define LM4550_REG_ALLFAKE   (LM4550_REG_FAKEREAD | LM4550_REG_FAKEPROBE)
 164
 165 struct lm4550_reg {
 166         u16 value;
 167         u16 flag;
 168         u16 wmask;
 169         u16 def;
 170 };
 171
 172 struct lm4550_reg lm4550_regfile[64] = {
 173         [AC97_RESET / 2]              = {.flag = LM4550_REG_OK \
 174                                                 | LM4550_REG_NOSAVE \
 175                                                 | LM4550_REG_FAKEREAD,
 176                                          .def = 0x0D50},
 177         [AC97_MASTER / 2]             = {.flag = LM4550_REG_OK
 178                                                 | LM4550_REG_FAKEPROBE,
 179                                          .wmask = 0x9F1F,
 180                                          .def = 0x8000},
 181         [AC97_HEADPHONE / 2]          = {.flag = LM4550_REG_OK \
 182                                                 | LM4550_REG_FAKEPROBE,
 183                                          .wmask = 0x9F1F,
 184                                          .def = 0x8000},
 185         [AC97_MASTER_MONO / 2]        = {.flag = LM4550_REG_OK \
 186                                                 | LM4550_REG_FAKEPROBE,
 187                                          .wmask = 0x801F,
 188                                          .def = 0x8000},
 189         [AC97_PC_BEEP / 2]            = {.flag = LM4550_REG_OK \
 190                                                 | LM4550_REG_FAKEPROBE,
 191                                          .wmask = 0x801E,
 192                                          .def = 0x0},
 193         [AC97_PHONE / 2]              = {.flag = LM4550_REG_OK \
 194                                                 | LM4550_REG_FAKEPROBE,
 195                                          .wmask = 0x801F,
 196                                          .def = 0x8008},
 197         [AC97_MIC / 2]                = {.flag = LM4550_REG_OK \
 198                                                 | LM4550_REG_FAKEPROBE,
 199                                          .wmask = 0x805F,
 200                                          .def = 0x8008},
 201         [AC97_LINE / 2]               = {.flag = LM4550_REG_OK \
 202                                                 | LM4550_REG_FAKEPROBE,
 203                                          .wmask = 0x9F1F,
 204                                          .def = 0x8808},
 205         [AC97_CD / 2]                 = {.flag = LM4550_REG_OK \
 206                                                 | LM4550_REG_FAKEPROBE,
 207                                          .wmask = 0x9F1F,
 208                                          .def = 0x8808},
 209         [AC97_VIDEO / 2]              = {.flag = LM4550_REG_OK \
 210                                                 | LM4550_REG_FAKEPROBE,
 211                                          .wmask = 0x9F1F,
 212                                          .def = 0x8808},
 213         [AC97_AUX / 2]                = {.flag = LM4550_REG_OK \
 214                                                 | LM4550_REG_FAKEPROBE,
 215                                          .wmask = 0x9F1F,
 216                                          .def = 0x8808},
 217         [AC97_PCM / 2]                = {.flag = LM4550_REG_OK \
 218                                                 | LM4550_REG_FAKEPROBE,
 219                                          .wmask = 0x9F1F,
 220                                          .def = 0x8008},
 221         [AC97_REC_SEL / 2]            = {.flag = LM4550_REG_OK \
 222                                                 | LM4550_REG_FAKEPROBE,
 223                                          .wmask = 0x707,
 224                                          .def = 0x0},
 225         [AC97_REC_GAIN / 2]           = {.flag = LM4550_REG_OK \
 226                                                 | LM4550_REG_FAKEPROBE,
 227                                          .wmask = 0x8F0F,
 228                                          .def = 0x8000},
 229         [AC97_GENERAL_PURPOSE / 2]    = {.flag = LM4550_REG_OK \
 230                                                 | LM4550_REG_FAKEPROBE,
 231                                          .def = 0x0,
 232                                          .wmask = 0xA380},
 233         [AC97_3D_CONTROL / 2]         = {.flag = LM4550_REG_OK \
 234                                                 | LM4550_REG_FAKEREAD \
 235                                                 | LM4550_REG_READONLY,
 236                                          .def = 0x0101},
 237         [AC97_POWERDOWN / 2]          = {.flag = LM4550_REG_OK \
 238                                                 | LM4550_REG_NOSHADOW \
 239                                                 | LM4550_REG_NOSAVE,
 240                                          .wmask = 0xFF00},
 241                                         /* may not write ones to
 242                                          * REF/ANL/DAC/ADC bits
 243                                          * FIXME: Is this ok?
 244                                          */
 245         [AC97_EXTENDED_ID / 2]        = {.flag = LM4550_REG_OK \
 246                                                 | LM4550_REG_FAKEREAD \
 247                                                 | LM4550_REG_READONLY,
 248                                          .def = 0x0201}, /* primary codec */
 249         [AC97_EXTENDED_STATUS / 2]    = {.flag = LM4550_REG_OK \
 250                                                 | LM4550_REG_NOSHADOW \
 251                                                 | LM4550_REG_NOSAVE,
 252                                          .wmask = 0x1},
 253         [AC97_PCM_FRONT_DAC_RATE / 2] = {.flag = LM4550_REG_OK \
 254                                                 | LM4550_REG_FAKEPROBE,
 255                                          .def = 0xBB80,
 256                                          .wmask = 0xFFFF},
 257         [AC97_PCM_LR_ADC_RATE / 2]    = {.flag = LM4550_REG_OK \
 258                                                 | LM4550_REG_FAKEPROBE,
 259                                          .def = 0xBB80,
 260                                          .wmask = 0xFFFF},
 261         [AC97_VENDOR_ID1 / 2]         = {.flag = LM4550_REG_OK \
 262                                                 | LM4550_REG_READONLY \
 263                                                 | LM4550_REG_FAKEREAD,
 264                                          .def = 0x4E53},
 265         [AC97_VENDOR_ID2 / 2]         = {.flag = LM4550_REG_OK \
 266                                                 | LM4550_REG_READONLY \
 267                                                 | LM4550_REG_FAKEREAD,
 268                                          .def = 0x4350}
 269 };
 270
 271 #define LM4550_RF_OK(reg)    (lm4550_regfile[reg / 2].flag & LM4550_REG_OK)
 272
 273 static void lm4550_regfile_init(void)
 274 {
 275         int i;
 276         for (i = 0; i < 64; i++)
 277                 if (lm4550_regfile[i].flag & LM4550_REG_FAKEPROBE)
 278                         lm4550_regfile[i].value = lm4550_regfile[i].def;
 279 }
 280
 281 static void lm4550_regfile_write_values_after_init(struct snd_ac97 *ac97)
 282 {
 283         int i;
 284         for (i = 0; i < 64; i++)
 285                 if ((lm4550_regfile[i].flag & LM4550_REG_FAKEPROBE) &&
 286                     (lm4550_regfile[i].value != lm4550_regfile[i].def)) {
 287                         PDEBUG(CODEC_FAKE, "lm4550_regfile_write_values_after_"
 288                                "init(): reg=0x%x value=0x%x / %d is different "
 289                                "from def=0x%x / %d\n",
 290                                i, lm4550_regfile[i].value,
 291                                lm4550_regfile[i].value, lm4550_regfile[i].def,
 292                                lm4550_regfile[i].def);
 293                         snd_ac97_write(ac97, i * 2, lm4550_regfile[i].value);
 294                         lm4550_regfile[i].flag |= LM4550_REG_DONEREAD;
 295                 }
 296 }
 297
 298
 299 /* direct registers */
 300 #define CR_REG(ml403_ac97cr, x) ((ml403_ac97cr)->port + CR_REG_##x)
 301
 302 #define CR_REG_PLAYFIFO         0x00
 303 #define   CR_PLAYDATA(a)        ((a) & 0xFFFF)
 304
 305 #define CR_REG_RECFIFO          0x04
 306 #define   CR_RECDATA(a)         ((a) & 0xFFFF)
 307
 308 #define CR_REG_STATUS           0x08
 309 #define   CR_RECOVER            (1<<7)
 310 #define   CR_PLAYUNDER          (1<<6)
 311 #define   CR_CODECREADY         (1<<5)
 312 #define   CR_RAF                (1<<4)
 313 #define   CR_RECEMPTY           (1<<3)
 314 #define   CR_RECFULL            (1<<2)
 315 #define   CR_PLAYHALF           (1<<1)
 316 #define   CR_PLAYFULL           (1<<0)
 317
 318 #define CR_REG_RESETFIFO        0x0C
 319 #define   CR_RECRESET           (1<<1)
 320 #define   CR_PLAYRESET          (1<<0)
 321
 322 #define CR_REG_CODEC_ADDR       0x10
 323 /* UG082 says:
 324  * #define   CR_CODEC_ADDR(a)  ((a) << 1)
 325  * #define   CR_CODEC_READ     (1<<0)
 326  * #define   CR_CODEC_WRITE    (0<<0)
 327  */
 328 /* RefDesign example says: */
 329 #define   CR_CODEC_ADDR(a)      ((a) << 0)
 330 #define   CR_CODEC_READ         (1<<7)
 331 #define   CR_CODEC_WRITE        (0<<7)
 332
 333 #define CR_REG_CODEC_DATAREAD   0x14
 334 #define   CR_CODEC_DATAREAD(v)  ((v) & 0xFFFF)
 335
 336 #define CR_REG_CODEC_DATAWRITE  0x18
 337 #define   CR_CODEC_DATAWRITE(v) ((v) & 0xFFFF)
 338
 339 #define CR_FIFO_SIZE            32
 340
 341 struct snd_ml403_ac97cr {
 342         /* lock for access to (controller) registers */
 343         spinlock_t reg_lock;
 344         /* mutex for the whole sequence of accesses to (controller) registers
 345          * which affect codec registers
 346          */
 347         struct mutex cdc_mutex;
 348
 349         int irq; /* for playback */
 350         int enable_irq; /* for playback */
 351
 352         int capture_irq;
 353         int enable_capture_irq;
 354
 355         struct resource *res_port;
 356         void *port;
 357
 358         struct snd_ac97 *ac97;
 359         int ac97_fake;
 360 #ifdef CODEC_STAT
 361         int ac97_read;
 362         int ac97_write;
 363 #endif
 364
 365         struct platform_device *pfdev;
 366         struct snd_card *card;
 367         struct snd_pcm *pcm;
 368         struct snd_pcm_substream *playback_substream;
 369         struct snd_pcm_substream *capture_substream;
 370
 371         struct snd_pcm_indirect2 ind_rec; /* for playback */
 372         struct snd_pcm_indirect2 capture_ind2_rec;
 373 };
 374
 375 static struct snd_pcm_hardware snd_ml403_ac97cr_playback = {
 376         .info =             (SNDRV_PCM_INFO_MMAP |
 377                              SNDRV_PCM_INFO_INTERLEAVED |
 378                              SNDRV_PCM_INFO_MMAP_VALID),
 379         .formats =          SNDRV_PCM_FMTBIT_S16_BE,
 380         .rates =            (SNDRV_PCM_RATE_CONTINUOUS |
 381                              SNDRV_PCM_RATE_8000_48000),
 382         .rate_min =         4000,
 383         .rate_max =         48000,
 384         .channels_min =     2,
 385         .channels_max =     2,
 386         .buffer_bytes_max = (128*1024),
 387         .period_bytes_min = CR_FIFO_SIZE/2,
 388         .period_bytes_max = (64*1024),
 389         .periods_min =      2,
 390         .periods_max =      (128*1024)/(CR_FIFO_SIZE/2),
 391         .fifo_size =        0,
 392 };
 393
 394 static struct snd_pcm_hardware snd_ml403_ac97cr_capture = {
 395         .info =             (SNDRV_PCM_INFO_MMAP |
 396                              SNDRV_PCM_INFO_INTERLEAVED |
 397                              SNDRV_PCM_INFO_MMAP_VALID),
 398         .formats =          SNDRV_PCM_FMTBIT_S16_BE,
 399         .rates =            (SNDRV_PCM_RATE_CONTINUOUS |
 400                              SNDRV_PCM_RATE_8000_48000),
 401         .rate_min =         4000,
 402         .rate_max =         48000,
 403         .channels_min =     2,
 404         .channels_max =     2,
 405         .buffer_bytes_max = (128*1024),
 406         .period_bytes_min = CR_FIFO_SIZE/2,
 407         .period_bytes_max = (64*1024),
 408         .periods_min =      2,
 409         .periods_max =      (128*1024)/(CR_FIFO_SIZE/2),
 410         .fifo_size =        0,
 411 };
 412
 413 static size_t
 414 snd_ml403_ac97cr_playback_ind2_zero(struct snd_pcm_substream *substream,
 415                                     struct snd_pcm_indirect2 *rec)
 416 {
 417         struct snd_ml403_ac97cr *ml403_ac97cr;
 418         int copied_words = 0;
 419         u32 full = 0;
 420
 421         ml403_ac97cr = snd_pcm_substream_chip(substream);
 422
 423         spin_lock(&ml403_ac97cr->reg_lock);
 424         while ((full = (in_be32(CR_REG(ml403_ac97cr, STATUS)) &
 425                         CR_PLAYFULL)) != CR_PLAYFULL) {
 426                 out_be32(CR_REG(ml403_ac97cr, PLAYFIFO), 0);
 427                 copied_words++;
 428         }
 429         rec->hw_ready = 0;
 430         spin_unlock(&ml403_ac97cr->reg_lock);
 431
 432         return (size_t) (copied_words * 2);
 433 }
 434
 435 static size_t
 436 snd_ml403_ac97cr_playback_ind2_copy(struct snd_pcm_substream *substream,
 437                                     struct snd_pcm_indirect2 *rec,
 438                                     size_t bytes)
 439 {
 440         struct snd_ml403_ac97cr *ml403_ac97cr;
 441         u16 *src;
 442         int copied_words = 0;
 443         u32 full = 0;
 444
 445         ml403_ac97cr = snd_pcm_substream_chip(substream);
 446         src = (u16 *)(substream->runtime->dma_area + rec->sw_data);
 447
 448         spin_lock(&ml403_ac97cr->reg_lock);
 449         while (((full = (in_be32(CR_REG(ml403_ac97cr, STATUS)) &
 450                          CR_PLAYFULL)) != CR_PLAYFULL) && (bytes > 1)) {
 451                 out_be32(CR_REG(ml403_ac97cr, PLAYFIFO),
 452                          CR_PLAYDATA(src[copied_words]));
 453                 copied_words++;
 454                 bytes = bytes - 2;
 455         }
 456         if (full != CR_PLAYFULL)
 457                 rec->hw_ready = 1;
 458         else
 459                 rec->hw_ready = 0;
 460         spin_unlock(&ml403_ac97cr->reg_lock);
 461
 462         return (size_t) (copied_words * 2);
 463 }
 464
 465 static size_t
 466 snd_ml403_ac97cr_capture_ind2_null(struct snd_pcm_substream *substream,
 467                                    struct snd_pcm_indirect2 *rec)
 468 {
 469         struct snd_ml403_ac97cr *ml403_ac97cr;
 470         int copied_words = 0;
 471         u32 empty = 0;
 472
 473         ml403_ac97cr = snd_pcm_substream_chip(substream);
 474
 475         spin_lock(&ml403_ac97cr->reg_lock);
 476         while ((empty = (in_be32(CR_REG(ml403_ac97cr, STATUS)) &
 477                          CR_RECEMPTY)) != CR_RECEMPTY) {
 478                 volatile u32 trash;
 479
 480                 trash = CR_RECDATA(in_be32(CR_REG(ml403_ac97cr, RECFIFO)));
 481                 /* Hmmmm, really necessary? Don't want call to in_be32()
 482                  * to be optimised away!
 483                  */
 484                 trash++;
 485                 copied_words++;
 486         }
 487         rec->hw_ready = 0;
 488         spin_unlock(&ml403_ac97cr->reg_lock);
 489
 490         return (size_t) (copied_words * 2);
 491 }
 492
 493 static size_t
 494 snd_ml403_ac97cr_capture_ind2_copy(struct snd_pcm_substream *substream,
 495                                    struct snd_pcm_indirect2 *rec, size_t bytes)
 496 {
 497         struct snd_ml403_ac97cr *ml403_ac97cr;
 498         u16 *dst;
 499         int copied_words = 0;
 500         u32 empty = 0;
 501
 502         ml403_ac97cr = snd_pcm_substream_chip(substream);
 503         dst = (u16 *)(substream->runtime->dma_area + rec->sw_data);
 504
 505         spin_lock(&ml403_ac97cr->reg_lock);
 506         while (((empty = (in_be32(CR_REG(ml403_ac97cr, STATUS)) &
 507                           CR_RECEMPTY)) != CR_RECEMPTY) && (bytes > 1)) {
 508                 dst[copied_words] = CR_RECDATA(in_be32(CR_REG(ml403_ac97cr,
 509                                                               RECFIFO)));
 510                 copied_words++;
 511                 bytes = bytes - 2;
 512         }
 513         if (empty != CR_RECEMPTY)
 514                 rec->hw_ready = 1;
 515         else
 516                 rec->hw_ready = 0;
 517         spin_unlock(&ml403_ac97cr->reg_lock);
 518
 519         return (size_t) (copied_words * 2);
 520 }
 521
 522 static snd_pcm_uframes_t
 523 snd_ml403_ac97cr_pcm_pointer(struct snd_pcm_substream *substream)
 524 {
 525         struct snd_ml403_ac97cr *ml403_ac97cr;
 526         struct snd_pcm_indirect2 *ind2_rec = NULL;
 527
 528         ml403_ac97cr = snd_pcm_substream_chip(substream);
 529
 530         if (substream == ml403_ac97cr->playback_substream)
 531                 ind2_rec = &ml403_ac97cr->ind_rec;
 532         if (substream == ml403_ac97cr->capture_substream)
 533                 ind2_rec = &ml403_ac97cr->capture_ind2_rec;
 534
 535         if (ind2_rec != NULL)
 536                 return snd_pcm_indirect2_pointer(substream, ind2_rec);
 537         return (snd_pcm_uframes_t) 0;
 538 }
 539
 540 static int
 541 snd_ml403_ac97cr_pcm_playback_trigger(struct snd_pcm_substream *substream,
 542                                       int cmd)
 543 {
 544         struct snd_ml403_ac97cr *ml403_ac97cr;
 545         int err = 0;
 546
 547         ml403_ac97cr = snd_pcm_substream_chip(substream);
 548
 549         switch (cmd) {
 550         case SNDRV_PCM_TRIGGER_START:
 551                 PDEBUG(WORK_INFO, "trigger(playback): START\n");
 552                 ml403_ac97cr->ind_rec.hw_ready = 1;
 553
 554                 /* clear play FIFO */
 555                 out_be32(CR_REG(ml403_ac97cr, RESETFIFO), CR_PLAYRESET);
 556
 557                 /* enable play irq */
 558                 ml403_ac97cr->enable_irq = 1;
 559                 enable_irq(ml403_ac97cr->irq);
 560                 break;
 561         case SNDRV_PCM_TRIGGER_STOP:
 562                 PDEBUG(WORK_INFO, "trigger(playback): STOP\n");
 563                 ml403_ac97cr->ind_rec.hw_ready = 0;
 564 #ifdef SND_PCM_INDIRECT2_STAT
 565                 snd_pcm_indirect2_stat(substream, &ml403_ac97cr->ind_rec);
 566 #endif
 567                 /* disable play irq */
 568                 disable_irq_nosync(ml403_ac97cr->irq);
 569                 ml403_ac97cr->enable_irq = 0;
 570                 break;
 571         default:
 572                 err = -EINVAL;
 573                 break;
 574         }
 575         PDEBUG(WORK_INFO, "trigger(playback): (done)\n");
 576         return err;
 577 }
 578
 579 static int
 580 snd_ml403_ac97cr_pcm_capture_trigger(struct snd_pcm_substream *substream,
 581                                       int cmd)
 582 {
 583         struct snd_ml403_ac97cr *ml403_ac97cr;
 584         int err = 0;
 585
 586         ml403_ac97cr = snd_pcm_substream_chip(substream);
 587
 588         switch (cmd) {
 589         case SNDRV_PCM_TRIGGER_START:
 590                 PDEBUG(WORK_INFO, "trigger(capture): START\n");
 591                 ml403_ac97cr->capture_ind2_rec.hw_ready = 0;
 592
 593                 /* clear record FIFO */
 594                 out_be32(CR_REG(ml403_ac97cr, RESETFIFO), CR_RECRESET);
 595
 596                 /* enable record irq */
 597                 ml403_ac97cr->enable_capture_irq = 1;
 598                 enable_irq(ml403_ac97cr->capture_irq);
 599                 break;
 600         case SNDRV_PCM_TRIGGER_STOP:
 601                 PDEBUG(WORK_INFO, "trigger(capture): STOP\n");
 602                 ml403_ac97cr->capture_ind2_rec.hw_ready = 0;
 603 #ifdef SND_PCM_INDIRECT2_STAT
 604                 snd_pcm_indirect2_stat(substream,
 605                                        &ml403_ac97cr->capture_ind2_rec);
 606 #endif
 607                 /* disable capture irq */
 608                 disable_irq_nosync(ml403_ac97cr->capture_irq);
 609                 ml403_ac97cr->enable_capture_irq = 0;
 610                 break;
 611         default:
 612                 err = -EINVAL;
 613                 break;
 614         }
 615         PDEBUG(WORK_INFO, "trigger(capture): (done)\n");
 616         return err;
 617 }
 618
 619 static int
 620 snd_ml403_ac97cr_pcm_playback_prepare(struct snd_pcm_substream *substream)
 621 {
 622         struct snd_ml403_ac97cr *ml403_ac97cr;
 623         struct snd_pcm_runtime *runtime;
 624
 625         ml403_ac97cr = snd_pcm_substream_chip(substream);
 626         runtime = substream->runtime;
 627
 628         PDEBUG(WORK_INFO,
 629                "prepare(): period_bytes=%d, minperiod_bytes=%d\n",
 630                snd_pcm_lib_period_bytes(substream), CR_FIFO_SIZE / 2);
 631
 632         /* set sampling rate */
 633         snd_ac97_set_rate(ml403_ac97cr->ac97, AC97_PCM_FRONT_DAC_RATE,
 634                           runtime->rate);
 635         PDEBUG(WORK_INFO, "prepare(): rate=%d\n", runtime->rate);
 636
 637         /* init struct for intermediate buffer */
 638         memset(&ml403_ac97cr->ind_rec, 0,
 639                sizeof(struct snd_pcm_indirect2));
 640         ml403_ac97cr->ind_rec.hw_buffer_size = CR_FIFO_SIZE;
 641         ml403_ac97cr->ind_rec.sw_buffer_size =
 642                 snd_pcm_lib_buffer_bytes(substream);
 643         ml403_ac97cr->ind_rec.min_periods = -1;
 644         ml403_ac97cr->ind_rec.min_multiple =
 645                 snd_pcm_lib_period_bytes(substream) / (CR_FIFO_SIZE / 2);
 646         PDEBUG(WORK_INFO, "prepare(): hw_buffer_size=%d, "
 647                "sw_buffer_size=%d, min_multiple=%d\n",
 648                CR_FIFO_SIZE, ml403_ac97cr->ind_rec.sw_buffer_size,
 649                ml403_ac97cr->ind_rec.min_multiple);
 650         return 0;
 651 }
 652
 653 static int
 654 snd_ml403_ac97cr_pcm_capture_prepare(struct snd_pcm_substream *substream)
 655 {
 656         struct snd_ml403_ac97cr *ml403_ac97cr;
 657         struct snd_pcm_runtime *runtime;
 658
 659         ml403_ac97cr = snd_pcm_substream_chip(substream);
 660         runtime = substream->runtime;
 661
 662         PDEBUG(WORK_INFO,
 663                "prepare(capture): period_bytes=%d, minperiod_bytes=%d\n",
 664                snd_pcm_lib_period_bytes(substream), CR_FIFO_SIZE / 2);
 665
 666         /* set sampling rate */
 667         snd_ac97_set_rate(ml403_ac97cr->ac97, AC97_PCM_LR_ADC_RATE,
 668                           runtime->rate);
 669         PDEBUG(WORK_INFO, "prepare(capture): rate=%d\n", runtime->rate);
 670
 671         /* init struct for intermediate buffer */
 672         memset(&ml403_ac97cr->capture_ind2_rec, 0,
 673                sizeof(struct snd_pcm_indirect2));
 674         ml403_ac97cr->capture_ind2_rec.hw_buffer_size = CR_FIFO_SIZE;
 675         ml403_ac97cr->capture_ind2_rec.sw_buffer_size =
 676                 snd_pcm_lib_buffer_bytes(substream);
 677         ml403_ac97cr->capture_ind2_rec.min_multiple =
 678                 snd_pcm_lib_period_bytes(substream) / (CR_FIFO_SIZE / 2);
 679         PDEBUG(WORK_INFO, "prepare(capture): hw_buffer_size=%d, "
 680                "sw_buffer_size=%d, min_multiple=%d\n", CR_FIFO_SIZE,
 681                ml403_ac97cr->capture_ind2_rec.sw_buffer_size,
 682                ml403_ac97cr->capture_ind2_rec.min_multiple);
 683         return 0;
 684 }
 685
 686 static int snd_ml403_ac97cr_hw_free(struct snd_pcm_substream *substream)
 687 {
 688         PDEBUG(WORK_INFO, "hw_free()\n");
 689         return snd_pcm_lib_free_pages(substream);
 690 }
 691
 692 static int
 693 snd_ml403_ac97cr_hw_params(struct snd_pcm_substream *substream,
 694                            struct snd_pcm_hw_params *hw_params)
 695 {
 696         PDEBUG(WORK_INFO, "hw_params(): desired buffer bytes=%d, desired "
 697                "period bytes=%d\n",
 698                params_buffer_bytes(hw_params), params_period_bytes(hw_params));
 699         return snd_pcm_lib_malloc_pages(substream,
 700                                         params_buffer_bytes(hw_params));
 701 }
 702
 703 static int snd_ml403_ac97cr_playback_open(struct snd_pcm_substream *substream)
 704 {
 705         struct snd_ml403_ac97cr *ml403_ac97cr;
 706         struct snd_pcm_runtime *runtime;
 707
 708         ml403_ac97cr = snd_pcm_substream_chip(substream);
 709         runtime = substream->runtime;
 710
 711         PDEBUG(WORK_INFO, "open(playback)\n");
 712         ml403_ac97cr->playback_substream = substream;
 713         runtime->hw = snd_ml403_ac97cr_playback;
 714
 715         snd_pcm_hw_constraint_step(runtime, 0,
 716                                    SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 717                                    CR_FIFO_SIZE / 2);
 718         return 0;
 719 }
 720
 721 static int snd_ml403_ac97cr_capture_open(struct snd_pcm_substream *substream)
 722 {
 723         struct snd_ml403_ac97cr *ml403_ac97cr;
 724         struct snd_pcm_runtime *runtime;
 725
 726         ml403_ac97cr = snd_pcm_substream_chip(substream);
 727         runtime = substream->runtime;
 728
 729         PDEBUG(WORK_INFO, "open(capture)\n");
 730         ml403_ac97cr->capture_substream = substream;
 731         runtime->hw = snd_ml403_ac97cr_capture;
 732
 733         snd_pcm_hw_constraint_step(runtime, 0,
 734                                    SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 735                                    CR_FIFO_SIZE / 2);
 736         return 0;
 737 }
 738
 739 static int snd_ml403_ac97cr_playback_close(struct snd_pcm_substream *substream)
 740 {
 741         struct snd_ml403_ac97cr *ml403_ac97cr;
 742
 743         ml403_ac97cr = snd_pcm_substream_chip(substream);
 744
 745         PDEBUG(WORK_INFO, "close(playback)\n");
 746         ml403_ac97cr->playback_substream = NULL;
 747         return 0;
 748 }
 749
 750 static int snd_ml403_ac97cr_capture_close(struct snd_pcm_substream *substream)
 751 {
 752         struct snd_ml403_ac97cr *ml403_ac97cr;
 753
 754         ml403_ac97cr = snd_pcm_substream_chip(substream);
 755
 756         PDEBUG(WORK_INFO, "close(capture)\n");
 757         ml403_ac97cr->capture_substream = NULL;
 758         return 0;
 759 }
 760
 761 static struct snd_pcm_ops snd_ml403_ac97cr_playback_ops = {
 762         .open = snd_ml403_ac97cr_playback_open,
 763         .close = snd_ml403_ac97cr_playback_close,
 764         .ioctl = snd_pcm_lib_ioctl,
 765         .hw_params = snd_ml403_ac97cr_hw_params,
 766         .hw_free = snd_ml403_ac97cr_hw_free,
 767         .prepare = snd_ml403_ac97cr_pcm_playback_prepare,
 768         .trigger = snd_ml403_ac97cr_pcm_playback_trigger,
 769         .pointer = snd_ml403_ac97cr_pcm_pointer,
 770 };
 771
 772 static struct snd_pcm_ops snd_ml403_ac97cr_capture_ops = {
 773         .open = snd_ml403_ac97cr_capture_open,
 774         .close = snd_ml403_ac97cr_capture_close,
 775         .ioctl = snd_pcm_lib_ioctl,
 776         .hw_params = snd_ml403_ac97cr_hw_params,
 777         .hw_free = snd_ml403_ac97cr_hw_free,
 778         .prepare = snd_ml403_ac97cr_pcm_capture_prepare,
 779         .trigger = snd_ml403_ac97cr_pcm_capture_trigger,
 780         .pointer = snd_ml403_ac97cr_pcm_pointer,
 781 };
 782
 783 static irqreturn_t snd_ml403_ac97cr_irq(int irq, void *dev_id)
 784 {
 785         struct snd_ml403_ac97cr *ml403_ac97cr;
 786         struct platform_device *pfdev;
 787         int cmp_irq;
 788
 789         ml403_ac97cr = (struct snd_ml403_ac97cr *)dev_id;
 790         if (ml403_ac97cr == NULL)
 791                 return IRQ_NONE;
 792
 793         pfdev = ml403_ac97cr->pfdev;
 794
 795         /* playback interrupt */
 796         cmp_irq = platform_get_irq(pfdev, 0);
 797         if (irq == cmp_irq) {
 798                 if (ml403_ac97cr->enable_irq)
 799                         snd_pcm_indirect2_playback_interrupt(
 800                                 ml403_ac97cr->playback_substream,
 801                                 &ml403_ac97cr->ind_rec,
 802                                 snd_ml403_ac97cr_playback_ind2_copy,
 803                                 snd_ml403_ac97cr_playback_ind2_zero);
 804                 else
 805                         goto __disable_irq;
 806         } else {
 807                 /* record interrupt */
 808                 cmp_irq = platform_get_irq(pfdev, 1);
 809                 if (irq == cmp_irq) {
 810                         if (ml403_ac97cr->enable_capture_irq)
 811                                 snd_pcm_indirect2_capture_interrupt(
 812                                         ml403_ac97cr->capture_substream,
 813                                         &ml403_ac97cr->capture_ind2_rec,
 814                                         snd_ml403_ac97cr_capture_ind2_copy,
 815                                         snd_ml403_ac97cr_capture_ind2_null);
 816                         else
 817                                 goto __disable_irq;
 818                 } else
 819                         return IRQ_NONE;
 820         }
 821         return IRQ_HANDLED;
 822
 823 __disable_irq:
 824         PDEBUG(INIT_INFO, "irq(): irq %d is meant to be disabled! So, now try "
 825                "to disable it _really_!\n", irq);
 826         disable_irq_nosync(irq);
 827         return IRQ_HANDLED;
 828 }
 829
 830 static unsigned short
 831 snd_ml403_ac97cr_codec_read(struct snd_ac97 *ac97, unsigned short reg)
 832 {
 833         struct snd_ml403_ac97cr *ml403_ac97cr = ac97->private_data;
 834 #ifdef CODEC_STAT
 835         u32 stat;
 836         u32 rafaccess = 0;
 837 #endif
 838         unsigned long end_time;
 839         u16 value = 0;
 840
 841         if (!LM4550_RF_OK(reg)) {
 842                 snd_printk(KERN_WARNING SND_ML403_AC97CR_DRIVER ": "
 843                            "access to unknown/unused codec register 0x%x "
 844                            "ignored!\n", reg);
 845                 return 0;
 846         }
 847         /* check if we can fake/answer this access from our shadow register */
 848         if ((lm4550_regfile[reg / 2].flag &
 849              (LM4550_REG_DONEREAD | LM4550_REG_ALLFAKE)) &&
 850             !(lm4550_regfile[reg / 2].flag & LM4550_REG_NOSHADOW)) {
 851                 if (lm4550_regfile[reg / 2].flag & LM4550_REG_FAKEREAD) {
 852                         PDEBUG(CODEC_FAKE, "codec_read(): faking read from "
 853                                "reg=0x%x, val=0x%x / %d\n",
 854                                reg, lm4550_regfile[reg / 2].def,
 855                                lm4550_regfile[reg / 2].def);
 856                         return lm4550_regfile[reg / 2].def;
 857                 } else if ((lm4550_regfile[reg / 2].flag &
 858                             LM4550_REG_FAKEPROBE) &&
 859                            ml403_ac97cr->ac97_fake) {
 860                         PDEBUG(CODEC_FAKE, "codec_read(): faking read from "
 861                                "reg=0x%x, val=0x%x / %d (probe)\n",
 862                                reg, lm4550_regfile[reg / 2].value,
 863                                lm4550_regfile[reg / 2].value);
 864                         return lm4550_regfile[reg / 2].value;
 865                 } else {
 866 #ifdef CODEC_STAT
 867                         PDEBUG(CODEC_FAKE, "codec_read(): read access "
 868                                "answered by shadow register 0x%x (value=0x%x "
 869                                "/ %d) (cw=%d cr=%d)\n",
 870                                reg, lm4550_regfile[reg / 2].value,
 871                                lm4550_regfile[reg / 2].value,
 872                                ml403_ac97cr->ac97_write,
 873                                ml403_ac97cr->ac97_read);
 874 #else
 875                         PDEBUG(CODEC_FAKE, "codec_read(): read access "
 876                                "answered by shadow register 0x%x (value=0x%x "
 877                                "/ %d)\n",
 878                                reg, lm4550_regfile[reg / 2].value,
 879                                lm4550_regfile[reg / 2].value);
 880 #endif
 881                         return lm4550_regfile[reg / 2].value;
 882                 }
 883         }
 884         /* if we are here, we _have_ to access the codec really, no faking */
 885         if (mutex_lock_interruptible(&ml403_ac97cr->cdc_mutex) != 0)
 886                 return 0;
 887 #ifdef CODEC_STAT
 888         ml403_ac97cr->ac97_read++;
 889 #endif
 890         spin_lock(&ml403_ac97cr->reg_lock);
 891         out_be32(CR_REG(ml403_ac97cr, CODEC_ADDR),
 892                  CR_CODEC_ADDR(reg) | CR_CODEC_READ);
 893         spin_unlock(&ml403_ac97cr->reg_lock);
 894         end_time = jiffies + (HZ / CODEC_TIMEOUT_AFTER_READ);
 895         do {
 896                 spin_lock(&ml403_ac97cr->reg_lock);
 897 #ifdef CODEC_STAT
 898                 rafaccess++;
 899                 stat = in_be32(CR_REG(ml403_ac97cr, STATUS));
 900                 if ((stat & CR_RAF) == CR_RAF) {
 901                         value = CR_CODEC_DATAREAD(
 902                                 in_be32(CR_REG(ml403_ac97cr, CODEC_DATAREAD)));
 903                         PDEBUG(CODEC_SUCCESS, "codec_read(): (done) reg=0x%x, "
 904                                "value=0x%x / %d (STATUS=0x%x)\n",
 905                                reg, value, value, stat);
 906 #else
 907                 if ((in_be32(CR_REG(ml403_ac97cr, STATUS)) &
 908                      CR_RAF) == CR_RAF) {
 909                         value = CR_CODEC_DATAREAD(
 910                                 in_be32(CR_REG(ml403_ac97cr, CODEC_DATAREAD)));
 911                         PDEBUG(CODEC_SUCCESS, "codec_read(): (done) "
 912                                "reg=0x%x, value=0x%x / %d\n",
 913                                reg, value, value);
 914 #endif
 915                         lm4550_regfile[reg / 2].value = value;
 916                         lm4550_regfile[reg / 2].flag |= LM4550_REG_DONEREAD;
 917                         spin_unlock(&ml403_ac97cr->reg_lock);
 918                         mutex_unlock(&ml403_ac97cr->cdc_mutex);
 919                         return value;
 920                 }
 921                 spin_unlock(&ml403_ac97cr->reg_lock);
 922                 schedule_timeout_uninterruptible(1);
 923         } while (time_after(end_time, jiffies));
 924         /* read the DATAREAD register anyway, see comment below */
 925         spin_lock(&ml403_ac97cr->reg_lock);
 926         value =
 927             CR_CODEC_DATAREAD(in_be32(CR_REG(ml403_ac97cr, CODEC_DATAREAD)));
 928         spin_unlock(&ml403_ac97cr->reg_lock);
 929 #ifdef CODEC_STAT
 930         snd_printk(KERN_WARNING SND_ML403_AC97CR_DRIVER ": "
 931                    "timeout while codec read! "
 932                    "(reg=0x%x, last STATUS=0x%x, DATAREAD=0x%x / %d, %d) "
 933                    "(cw=%d, cr=%d)\n",
 934                    reg, stat, value, value, rafaccess,
 935                    ml403_ac97cr->ac97_write, ml403_ac97cr->ac97_read);
 936 #else
 937         snd_printk(KERN_WARNING SND_ML403_AC97CR_DRIVER ": "
 938                    "timeout while codec read! "
 939                    "(reg=0x%x, DATAREAD=0x%x / %d)\n",
 940                    reg, value, value);
 941 #endif
 942         /* BUG: This is PURE speculation! But after _most_ read timeouts the
 943          * value in the register is ok!
 944          */
 945         lm4550_regfile[reg / 2].value = value;
 946         lm4550_regfile[reg / 2].flag |= LM4550_REG_DONEREAD;
 947         mutex_unlock(&ml403_ac97cr->cdc_mutex);
 948         return value;
 949 }
 950
 951 static void
 952 snd_ml403_ac97cr_codec_write(struct snd_ac97 *ac97, unsigned short reg,
 953                              unsigned short val)
 954 {
 955         struct snd_ml403_ac97cr *ml403_ac97cr = ac97->private_data;
 956
 957 #ifdef CODEC_STAT
 958         u32 stat;
 959         u32 rafaccess = 0;
 960 #endif
 961 #ifdef CODEC_WRITE_CHECK_RAF
 962         unsigned long end_time;
 963 #endif
 964
 965         if (!LM4550_RF_OK(reg)) {
 966                 snd_printk(KERN_WARNING SND_ML403_AC97CR_DRIVER ": "
 967                            "access to unknown/unused codec register 0x%x "
 968                            "ignored!\n", reg);
 969                 return;
 970         }
 971         if (lm4550_regfile[reg / 2].flag & LM4550_REG_READONLY) {
 972                 snd_printk(KERN_WARNING SND_ML403_AC97CR_DRIVER ": "
 973                            "write access to read only codec register 0x%x "
 974                            "ignored!\n", reg);
 975                 return;
 976         }
 977         if ((val & lm4550_regfile[reg / 2].wmask) != val) {
 978                 snd_printk(KERN_WARNING SND_ML403_AC97CR_DRIVER ": "
 979                            "write access to codec register 0x%x "
 980                            "with bad value 0x%x / %d!\n",
 981                            reg, val, val);
 982                 val = val & lm4550_regfile[reg / 2].wmask;
 983         }
 984         if (((lm4550_regfile[reg / 2].flag & LM4550_REG_FAKEPROBE) &&
 985              ml403_ac97cr->ac97_fake) &&
 986             !(lm4550_regfile[reg / 2].flag & LM4550_REG_NOSHADOW)) {
 987                 PDEBUG(CODEC_FAKE, "codec_write(): faking write to reg=0x%x, "
 988                        "val=0x%x / %d\n", reg, val, val);
 989                 lm4550_regfile[reg / 2].value = (val &
 990                                                 lm4550_regfile[reg / 2].wmask);
 991                 return;
 992         }
 993         if (mutex_lock_interruptible(&ml403_ac97cr->cdc_mutex) != 0)
 994                 return;
 995 #ifdef CODEC_STAT
 996         ml403_ac97cr->ac97_write++;
 997 #endif
 998         spin_lock(&ml403_ac97cr->reg_lock);
 999         out_be32(CR_REG(ml403_ac97cr, CODEC_DATAWRITE),
1000                  CR_CODEC_DATAWRITE(val));
1001         out_be32(CR_REG(ml403_ac97cr, CODEC_ADDR),
1002                  CR_CODEC_ADDR(reg) | CR_CODEC_WRITE);
1003         spin_unlock(&ml403_ac97cr->reg_lock);
1004 #ifdef CODEC_WRITE_CHECK_RAF
1005         /* check CR_CODEC_RAF bit to see if write access to register is done;
1006          * loop until bit is set or timeout happens
1007          */
1008         end_time = jiffies + HZ / CODEC_TIMEOUT_AFTER_WRITE;
1009         do {
1010                 spin_lock(&ml403_ac97cr->reg_lock);
1011 #ifdef CODEC_STAT
1012                 rafaccess++;
1013                 stat = in_be32(CR_REG(ml403_ac97cr, STATUS))
1014                 if ((stat & CR_RAF) == CR_RAF) {
1015 #else
1016                 if ((in_be32(CR_REG(ml403_ac97cr, STATUS)) &
1017                      CR_RAF) == CR_RAF) {
1018 #endif
1019                         PDEBUG(CODEC_SUCCESS, "codec_write(): (done) "
1020                                "reg=0x%x, value=%d / 0x%x\n",
1021                                reg, val, val);
1022                         if (!(lm4550_regfile[reg / 2].flag &
1023                               LM4550_REG_NOSHADOW) &&
1024                             !(lm4550_regfile[reg / 2].flag &
1025                               LM4550_REG_NOSAVE))
1026                                 lm4550_regfile[reg / 2].value = val;
1027                         lm4550_regfile[reg / 2].flag |= LM4550_REG_DONEREAD;
1028                         spin_unlock(&ml403_ac97cr->reg_lock);
1029                         mutex_unlock(&ml403_ac97cr->cdc_mutex);
1030                         return;
1031                 }
1032                 spin_unlock(&ml403_ac97cr->reg_lock);
1033                 schedule_timeout_uninterruptible(1);
1034         } while (time_after(end_time, jiffies));
1035 #ifdef CODEC_STAT
1036         snd_printk(KERN_WARNING SND_ML403_AC97CR_DRIVER ": "
1037                    "timeout while codec write "
1038                    "(reg=0x%x, val=0x%x / %d, last STATUS=0x%x, %d) "
1039                    "(cw=%d, cr=%d)\n",
1040                    reg, val, val, stat, rafaccess, ml403_ac97cr->ac97_write,
1041                    ml403_ac97cr->ac97_read);
1042 #else
1043         snd_printk(KERN_WARNING SND_ML403_AC97CR_DRIVER ": "
1044                    "timeout while codec write (reg=0x%x, val=0x%x / %d)\n",
1045                    reg, val, val);
1046 #endif
1047 #else /* CODEC_WRITE_CHECK_RAF */
1048 #if CODEC_WAIT_AFTER_WRITE > 0
1049         /* officially, in AC97 spec there is no possibility for a AC97
1050          * controller to determine, if write access is done or not - so: How
1051          * is Xilinx able to provide a RAF bit for write access?
1052          * => very strange, thus just don't check RAF bit (compare with
1053          * Xilinx's example app in EDK 8.1i) and wait
1054          */
1055         schedule_timeout_uninterruptible(HZ / CODEC_WAIT_AFTER_WRITE);
1056 #endif
1057         PDEBUG(CODEC_SUCCESS, "codec_write(): (done) "
1058                "reg=0x%x, value=%d / 0x%x (no RAF check)\n",
1059                reg, val, val);
1060 #endif
1061         mutex_unlock(&ml403_ac97cr->cdc_mutex);
1062         return;
1063 }
1064
1065 static int __devinit
1066 snd_ml403_ac97cr_chip_init(struct snd_ml403_ac97cr *ml403_ac97cr)
1067 {
1068         unsigned long end_time;
1069         PDEBUG(INIT_INFO, "chip_init():\n");
1070         end_time = jiffies + HZ / CODEC_TIMEOUT_ON_INIT;
1071         do {
1072                 if (in_be32(CR_REG(ml403_ac97cr, STATUS)) & CR_CODECREADY) {
1073                         /* clear both hardware FIFOs */
1074                         out_be32(CR_REG(ml403_ac97cr, RESETFIFO),
1075                                  CR_RECRESET | CR_PLAYRESET);
1076                         PDEBUG(INIT_INFO, "chip_init(): (done)\n");
1077                         return 0;
1078                 }
1079                 schedule_timeout_uninterruptible(1);
1080         } while (time_after(end_time, jiffies));
1081         snd_printk(KERN_ERR SND_ML403_AC97CR_DRIVER ": "
1082                    "timeout while waiting for codec, "
1083                    "not ready!\n");
1084         return -EBUSY;
1085 }
1086
1087 static int snd_ml403_ac97cr_free(struct snd_ml403_ac97cr *ml403_ac97cr)
1088 {
1089         PDEBUG(INIT_INFO, "free():\n");
1090         /* irq release */
1091         if (ml403_ac97cr->irq >= 0)
1092                 free_irq(ml403_ac97cr->irq, ml403_ac97cr);
1093         if (ml403_ac97cr->capture_irq >= 0)
1094                 free_irq(ml403_ac97cr->capture_irq, ml403_ac97cr);
1095         /* give back "port" */
1096         if (ml403_ac97cr->port != NULL)
1097                 iounmap(ml403_ac97cr->port);
1098         kfree(ml403_ac97cr);
1099         PDEBUG(INIT_INFO, "free(): (done)\n");
1100         return 0;
1101 }
1102
1103 static int snd_ml403_ac97cr_dev_free(struct snd_device *snddev)
1104 {
1105         struct snd_ml403_ac97cr *ml403_ac97cr = snddev->device_data;
1106         PDEBUG(INIT_INFO, "dev_free():\n");
1107         return snd_ml403_ac97cr_free(ml403_ac97cr);
1108 }
1109
1110 static int __devinit
1111 snd_ml403_ac97cr_create(struct snd_card *card, struct platform_device *pfdev,
1112                         struct snd_ml403_ac97cr **rml403_ac97cr)
1113 {
1114         struct snd_ml403_ac97cr *ml403_ac97cr;
1115         int err;
1116         static struct snd_device_ops ops = {
1117                 .dev_free = snd_ml403_ac97cr_dev_free,
1118         };
1119         struct resource *resource;
1120         int irq;
1121
1122         *rml403_ac97cr = NULL;
1123         ml403_ac97cr = kzalloc(sizeof(*ml403_ac97cr), GFP_KERNEL);
1124         if (ml403_ac97cr == NULL)
1125                 return -ENOMEM;
1126         spin_lock_init(&ml403_ac97cr->reg_lock);
1127         mutex_init(&ml403_ac97cr->cdc_mutex);
1128         ml403_ac97cr->card = card;
1129         ml403_ac97cr->pfdev = pfdev;
1130         ml403_ac97cr->irq = -1;
1131         ml403_ac97cr->enable_irq = 0;
1132         ml403_ac97cr->capture_irq = -1;
1133         ml403_ac97cr->enable_capture_irq = 0;
1134         ml403_ac97cr->port = NULL;
1135         ml403_ac97cr->res_port = NULL;
1136
1137         PDEBUG(INIT_INFO, "Trying to reserve resources now ...\n");
1138         resource = platform_get_resource(pfdev, IORESOURCE_MEM, 0);
1139         /* get "port" */
1140         ml403_ac97cr->port = ioremap_nocache(resource->start,
1141                                              (resource->end) -
1142                                              (resource->start) + 1);
1143         if (ml403_ac97cr->port == NULL) {
1144                 snd_printk(KERN_ERR SND_ML403_AC97CR_DRIVER ": "
1145                            "unable to remap memory region (%x to %x)\n",
1146                            resource->start, resource->end);
1147                 snd_ml403_ac97cr_free(ml403_ac97cr);
1148                 return -EBUSY;
1149         }
1150         snd_printk(KERN_INFO SND_ML403_AC97CR_DRIVER ": "
1151                    "remap controller memory region to "
1152                    "0x%x done\n", (unsigned int)ml403_ac97cr->port);
1153         /* get irq */
1154         irq = platform_get_irq(pfdev, 0);
1155         if (request_irq(irq, snd_ml403_ac97cr_irq, IRQF_DISABLED,
1156                         dev_name(&pfdev->dev), (void *)ml403_ac97cr)) {
1157                 snd_printk(KERN_ERR SND_ML403_AC97CR_DRIVER ": "
1158                            "unable to grab IRQ %d\n",
1159                            irq);
1160                 snd_ml403_ac97cr_free(ml403_ac97cr);
1161                 return -EBUSY;
1162         }
1163         ml403_ac97cr->irq = irq;
1164         snd_printk(KERN_INFO SND_ML403_AC97CR_DRIVER ": "
1165                    "request (playback) irq %d done\n",
1166                    ml403_ac97cr->irq);
1167         irq = platform_get_irq(pfdev, 1);
1168         if (request_irq(irq, snd_ml403_ac97cr_irq, IRQF_DISABLED,
1169                         dev_name(&pfdev->dev), (void *)ml403_ac97cr)) {
1170                 snd_printk(KERN_ERR SND_ML403_AC97CR_DRIVER ": "
1171                            "unable to grab IRQ %d\n",
1172                            irq);
1173                 snd_ml403_ac97cr_free(ml403_ac97cr);
1174                 return -EBUSY;
1175         }
1176         ml403_ac97cr->capture_irq = irq;
1177         snd_printk(KERN_INFO SND_ML403_AC97CR_DRIVER ": "
1178                    "request (capture) irq %d done\n",
1179                    ml403_ac97cr->capture_irq);
1180
1181         err = snd_ml403_ac97cr_chip_init(ml403_ac97cr);
1182         if (err < 0) {
1183                 snd_ml403_ac97cr_free(ml403_ac97cr);
1184                 return err;
1185         }
1186
1187         err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, ml403_ac97cr, &ops);
1188         if (err < 0) {
1189                 PDEBUG(INIT_FAILURE, "probe(): snd_device_new() failed!\n");
1190                 snd_ml403_ac97cr_free(ml403_ac97cr);
1191                 return err;
1192         }
1193
1194         *rml403_ac97cr = ml403_ac97cr;
1195         return 0;
1196 }
1197
1198 static void snd_ml403_ac97cr_mixer_free(struct snd_ac97 *ac97)
1199 {
1200         struct snd_ml403_ac97cr *ml403_ac97cr = ac97->private_data;
1201         PDEBUG(INIT_INFO, "mixer_free():\n");
1202         ml403_ac97cr->ac97 = NULL;
1203         PDEBUG(INIT_INFO, "mixer_free(): (done)\n");
1204 }
1205
1206 static int __devinit
1207 snd_ml403_ac97cr_mixer(struct snd_ml403_ac97cr *ml403_ac97cr)
1208 {
1209         struct snd_ac97_bus *bus;
1210         struct snd_ac97_template ac97;
1211         int err;
1212         static struct snd_ac97_bus_ops ops = {
1213                 .write = snd_ml403_ac97cr_codec_write,
1214                 .read = snd_ml403_ac97cr_codec_read,
1215         };
1216         PDEBUG(INIT_INFO, "mixer():\n");
1217         err = snd_ac97_bus(ml403_ac97cr->card, 0, &ops, NULL, &bus);
1218         if (err < 0)
1219                 return err;
1220
1221         memset(&ac97, 0, sizeof(ac97));
1222         ml403_ac97cr->ac97_fake = 1;
1223         lm4550_regfile_init();
1224 #ifdef CODEC_STAT
1225         ml403_ac97cr->ac97_read = 0;
1226         ml403_ac97cr->ac97_write = 0;
1227 #endif
1228         ac97.private_data = ml403_ac97cr;
1229         ac97.private_free = snd_ml403_ac97cr_mixer_free;
1230         ac97.scaps = AC97_SCAP_AUDIO | AC97_SCAP_SKIP_MODEM |
1231             AC97_SCAP_NO_SPDIF;
1232         err = snd_ac97_mixer(bus, &ac97, &ml403_ac97cr->ac97);
1233         ml403_ac97cr->ac97_fake = 0;
1234         lm4550_regfile_write_values_after_init(ml403_ac97cr->ac97);
1235         PDEBUG(INIT_INFO, "mixer(): (done) snd_ac97_mixer()=%d\n", err);
1236         return err;
1237 }
1238
1239 static int __devinit
1240 snd_ml403_ac97cr_pcm(struct snd_ml403_ac97cr *ml403_ac97cr, int device,
1241                      struct snd_pcm **rpcm)
1242 {
1243         struct snd_pcm *pcm;
1244         int err;
1245
1246         if (rpcm)
1247                 *rpcm = NULL;
1248         err = snd_pcm_new(ml403_ac97cr->card, "ML403AC97CR/1", device, 1, 1,
1249                           &pcm);
1250         if (err < 0)
1251                 return err;
1252         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
1253                         &snd_ml403_ac97cr_playback_ops);
1254         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
1255                         &snd_ml403_ac97cr_capture_ops);
1256         pcm->private_data = ml403_ac97cr;
1257         pcm->info_flags = 0;
1258         strcpy(pcm->name, "ML403AC97CR DAC/ADC");
1259         ml403_ac97cr->pcm = pcm;
1260
1261         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
1262                                           snd_dma_continuous_data(GFP_KERNEL),
1263                                           64 * 1024,
1264                                           128 * 1024);
1265         if (rpcm)
1266                 *rpcm = pcm;
1267         return 0;
1268 }
1269
1270 static int __devinit snd_ml403_ac97cr_probe(struct platform_device *pfdev)
1271 {
1272         struct snd_card *card;
1273         struct snd_ml403_ac97cr *ml403_ac97cr = NULL;
1274         int err;
1275         int dev = pfdev->id;
1276
1277         if (dev >= SNDRV_CARDS)
1278                 return -ENODEV;
1279         if (!enable[dev])
1280                 return -ENOENT;
1281
1282         card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
1283         if (card == NULL)
1284                 return -ENOMEM;
1285         err = snd_ml403_ac97cr_create(card, pfdev, &ml403_ac97cr);
1286         if (err < 0) {
1287                 PDEBUG(INIT_FAILURE, "probe(): create failed!\n");
1288                 snd_card_free(card);
1289                 return err;
1290         }
1291         PDEBUG(INIT_INFO, "probe(): create done\n");
1292         card->private_data = ml403_ac97cr;
1293         err = snd_ml403_ac97cr_mixer(ml403_ac97cr);
1294         if (err < 0) {
1295                 snd_card_free(card);
1296                 return err;
1297         }
1298         PDEBUG(INIT_INFO, "probe(): mixer done\n");
1299         err = snd_ml403_ac97cr_pcm(ml403_ac97cr, 0, NULL);
1300         if (err < 0) {
1301                 snd_card_free(card);
1302                 return err;
1303         }
1304         PDEBUG(INIT_INFO, "probe(): PCM done\n");
1305         strcpy(card->driver, SND_ML403_AC97CR_DRIVER);
1306         strcpy(card->shortname, "ML403 AC97 Controller Reference");
1307         sprintf(card->longname, "%s %s at 0x%lx, irq %i & %i, device %i",
1308                 card->shortname, card->driver,
1309                 (unsigned long)ml403_ac97cr->port, ml403_ac97cr->irq,
1310                 ml403_ac97cr->capture_irq, dev + 1);
1311
1312         snd_card_set_dev(card, &pfdev->dev);
1313
1314         err = snd_card_register(card);
1315         if (err < 0) {
1316                 snd_card_free(card);
1317                 return err;
1318         }
1319         platform_set_drvdata(pfdev, card);
1320         PDEBUG(INIT_INFO, "probe(): (done)\n");
1321         return 0;
1322 }
1323
1324 static int snd_ml403_ac97cr_remove(struct platform_device *pfdev)
1325 {
1326         snd_card_free(platform_get_drvdata(pfdev));
1327         platform_set_drvdata(pfdev, NULL);
1328         return 0;
1329 }
1330
1331 /* work with hotplug and coldplug */
1332 MODULE_ALIAS("platform:" SND_ML403_AC97CR_DRIVER);
1333
1334 static struct platform_driver snd_ml403_ac97cr_driver = {
1335         .probe = snd_ml403_ac97cr_probe,
1336         .remove = snd_ml403_ac97cr_remove,
1337         .driver = {
1338                 .name = SND_ML403_AC97CR_DRIVER,
1339                 .owner = THIS_MODULE,
1340         },
1341 };
1342
1343 static int __init alsa_card_ml403_ac97cr_init(void)
1344 {
1345         return platform_driver_register(&snd_ml403_ac97cr_driver);
1346 }
1347
1348 static void __exit alsa_card_ml403_ac97cr_exit(void)
1349 {
1350         platform_driver_unregister(&snd_ml403_ac97cr_driver);
1351 }
1352
1353 module_init(alsa_card_ml403_ac97cr_init)
1354 module_exit(alsa_card_ml403_ac97cr_exit)