sound/pci/nm256/nm256.c

   1 /*
   2  * Driver for NeoMagic 256AV and 256ZX chipsets.
   3  * Copyright (c) 2000 by Takashi Iwai <tiwai@suse.de>
   4  *
   5  * Based on nm256_audio.c OSS driver in linux kernel.
   6  * The original author of OSS nm256 driver wishes to remain anonymous,
   7  * so I just put my acknoledgment to him/her here.
   8  * The original author's web page is found at
   9  *      http://www.uglx.org/sony.html
  10  *
  11  *
  12  *   This program is free software; you can redistribute it and/or modify
  13  *   it under the terms of the GNU General Public License as published by
  14  *   the Free Software Foundation; either version 2 of the License, or
  15  *   (at your option) any later version.
  16  *
  17  *   This program is distributed in the hope that it will be useful,
  18  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *   GNU General Public License for more details.
  21  *
  22  *   You should have received a copy of the GNU General Public License
  23  *   along with this program; if not, write to the Free Software
  24  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  25  */
  26
  27 #include <linux/io.h>
  28 #include <linux/delay.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/init.h>
  31 #include <linux/pci.h>
  32 #include <linux/slab.h>
  33 #include <linux/module.h>
  34 #include <linux/mutex.h>
  35
  36 #include <sound/core.h>
  37 #include <sound/info.h>
  38 #include <sound/control.h>
  39 #include <sound/pcm.h>
  40 #include <sound/ac97_codec.h>
  41 #include <sound/initval.h>
  42
  43 #define CARD_NAME "NeoMagic 256AV/ZX"
  44 #define DRIVER_NAME "NM256"
  45
  46 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
  47 MODULE_DESCRIPTION("NeoMagic NM256AV/ZX");
  48 MODULE_LICENSE("GPL");
  49 MODULE_SUPPORTED_DEVICE("{{NeoMagic,NM256AV},"
  50                 "{NeoMagic,NM256ZX}}");
  51
  52 /*
  53  * some compile conditions.
  54  */
  55
  56 static int index = SNDRV_DEFAULT_IDX1;  /* Index */
  57 static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */
  58 static int playback_bufsize = 16;
  59 static int capture_bufsize = 16;
  60 static bool force_ac97;                 /* disabled as default */
  61 static int buffer_top;                  /* not specified */
  62 static bool use_cache;                  /* disabled */
  63 static bool vaio_hack;                  /* disabled */
  64 static bool reset_workaround;
  65 static bool reset_workaround_2;
  66
  67 module_param(index, int, 0444);
  68 MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
  69 module_param(id, charp, 0444);
  70 MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
  71 module_param(playback_bufsize, int, 0444);
  72 MODULE_PARM_DESC(playback_bufsize, "DAC frame size in kB for " CARD_NAME " soundcard.");
  73 module_param(capture_bufsize, int, 0444);
  74 MODULE_PARM_DESC(capture_bufsize, "ADC frame size in kB for " CARD_NAME " soundcard.");
  75 module_param(force_ac97, bool, 0444);
  76 MODULE_PARM_DESC(force_ac97, "Force to use AC97 codec for " CARD_NAME " soundcard.");
  77 module_param(buffer_top, int, 0444);
  78 MODULE_PARM_DESC(buffer_top, "Set the top address of audio buffer for " CARD_NAME " soundcard.");
  79 module_param(use_cache, bool, 0444);
  80 MODULE_PARM_DESC(use_cache, "Enable the cache for coefficient table access.");
  81 module_param(vaio_hack, bool, 0444);
  82 MODULE_PARM_DESC(vaio_hack, "Enable workaround for Sony VAIO notebooks.");
  83 module_param(reset_workaround, bool, 0444);
  84 MODULE_PARM_DESC(reset_workaround, "Enable AC97 RESET workaround for some laptops.");
  85 module_param(reset_workaround_2, bool, 0444);
  86 MODULE_PARM_DESC(reset_workaround_2, "Enable extended AC97 RESET workaround for some other laptops.");
  87
  88 /* just for backward compatibility */
  89 static bool enable;
  90 module_param(enable, bool, 0444);
  91
  92
  93
  94 /*
  95  * hw definitions
  96  */
  97
  98 /* The BIOS signature. */
  99 #define NM_SIGNATURE 0x4e4d0000
 100 /* Signature mask. */
 101 #define NM_SIG_MASK 0xffff0000
 102
 103 /* Size of the second memory area. */
 104 #define NM_PORT2_SIZE 4096
 105
 106 /* The base offset of the mixer in the second memory area. */
 107 #define NM_MIXER_OFFSET 0x600
 108
 109 /* The maximum size of a coefficient entry. */
 110 #define NM_MAX_PLAYBACK_COEF_SIZE       0x5000
 111 #define NM_MAX_RECORD_COEF_SIZE         0x1260
 112
 113 /* The interrupt register. */
 114 #define NM_INT_REG 0xa04
 115 /* And its bits. */
 116 #define NM_PLAYBACK_INT 0x40
 117 #define NM_RECORD_INT 0x100
 118 #define NM_MISC_INT_1 0x4000
 119 #define NM_MISC_INT_2 0x1
 120 #define NM_ACK_INT(chip, X) snd_nm256_writew(chip, NM_INT_REG, (X) << 1)
 121
 122 /* The AV's "mixer ready" status bit and location. */
 123 #define NM_MIXER_STATUS_OFFSET 0xa04
 124 #define NM_MIXER_READY_MASK 0x0800
 125 #define NM_MIXER_PRESENCE 0xa06
 126 #define NM_PRESENCE_MASK 0x0050
 127 #define NM_PRESENCE_VALUE 0x0040
 128
 129 /*
 130  * For the ZX.  It uses the same interrupt register, but it holds 32
 131  * bits instead of 16.
 132  */
 133 #define NM2_PLAYBACK_INT 0x10000
 134 #define NM2_RECORD_INT 0x80000
 135 #define NM2_MISC_INT_1 0x8
 136 #define NM2_MISC_INT_2 0x2
 137 #define NM2_ACK_INT(chip, X) snd_nm256_writel(chip, NM_INT_REG, (X))
 138
 139 /* The ZX's "mixer ready" status bit and location. */
 140 #define NM2_MIXER_STATUS_OFFSET 0xa06
 141 #define NM2_MIXER_READY_MASK 0x0800
 142
 143 /* The playback registers start from here. */
 144 #define NM_PLAYBACK_REG_OFFSET 0x0
 145 /* The record registers start from here. */
 146 #define NM_RECORD_REG_OFFSET 0x200
 147
 148 /* The rate register is located 2 bytes from the start of the register area. */
 149 #define NM_RATE_REG_OFFSET 2
 150
 151 /* Mono/stereo flag, number of bits on playback, and rate mask. */
 152 #define NM_RATE_STEREO 1
 153 #define NM_RATE_BITS_16 2
 154 #define NM_RATE_MASK 0xf0
 155
 156 /* Playback enable register. */
 157 #define NM_PLAYBACK_ENABLE_REG (NM_PLAYBACK_REG_OFFSET + 0x1)
 158 #define NM_PLAYBACK_ENABLE_FLAG 1
 159 #define NM_PLAYBACK_ONESHOT 2
 160 #define NM_PLAYBACK_FREERUN 4
 161
 162 /* Mutes the audio output. */
 163 #define NM_AUDIO_MUTE_REG (NM_PLAYBACK_REG_OFFSET + 0x18)
 164 #define NM_AUDIO_MUTE_LEFT 0x8000
 165 #define NM_AUDIO_MUTE_RIGHT 0x0080
 166
 167 /* Recording enable register. */
 168 #define NM_RECORD_ENABLE_REG (NM_RECORD_REG_OFFSET + 0)
 169 #define NM_RECORD_ENABLE_FLAG 1
 170 #define NM_RECORD_FREERUN 2
 171
 172 /* coefficient buffer pointer */
 173 #define NM_COEFF_START_OFFSET   0x1c
 174 #define NM_COEFF_END_OFFSET     0x20
 175
 176 /* DMA buffer offsets */
 177 #define NM_RBUFFER_START (NM_RECORD_REG_OFFSET + 0x4)
 178 #define NM_RBUFFER_END   (NM_RECORD_REG_OFFSET + 0x10)
 179 #define NM_RBUFFER_WMARK (NM_RECORD_REG_OFFSET + 0xc)
 180 #define NM_RBUFFER_CURRP (NM_RECORD_REG_OFFSET + 0x8)
 181
 182 #define NM_PBUFFER_START (NM_PLAYBACK_REG_OFFSET + 0x4)
 183 #define NM_PBUFFER_END   (NM_PLAYBACK_REG_OFFSET + 0x14)
 184 #define NM_PBUFFER_WMARK (NM_PLAYBACK_REG_OFFSET + 0xc)
 185 #define NM_PBUFFER_CURRP (NM_PLAYBACK_REG_OFFSET + 0x8)
 186
 187 struct nm256_stream {
 188
 189         struct nm256 *chip;
 190         struct snd_pcm_substream *substream;
 191         int running;
 192         int suspended;
 193
 194         u32 buf;        /* offset from chip->buffer */
 195         int bufsize;    /* buffer size in bytes */
 196         void __iomem *bufptr;           /* mapped pointer */
 197         unsigned long bufptr_addr;      /* physical address of the mapped pointer */
 198
 199         int dma_size;           /* buffer size of the substream in bytes */
 200         int period_size;        /* period size in bytes */
 201         int periods;            /* # of periods */
 202         int shift;              /* bit shifts */
 203         int cur_period;         /* current period # */
 204
 205 };
 206
 207 struct nm256 {
 208
 209         struct snd_card *card;
 210
 211         void __iomem *cport;            /* control port */
 212         struct resource *res_cport;     /* its resource */
 213         unsigned long cport_addr;       /* physical address */
 214
 215         void __iomem *buffer;           /* buffer */
 216         struct resource *res_buffer;    /* its resource */
 217         unsigned long buffer_addr;      /* buffer phyiscal address */
 218
 219         u32 buffer_start;               /* start offset from pci resource 0 */
 220         u32 buffer_end;                 /* end offset */
 221         u32 buffer_size;                /* total buffer size */
 222
 223         u32 all_coeff_buf;              /* coefficient buffer */
 224         u32 coeff_buf[2];               /* coefficient buffer for each stream */
 225
 226         unsigned int coeffs_current: 1; /* coeff. table is loaded? */
 227         unsigned int use_cache: 1;      /* use one big coef. table */
 228         unsigned int reset_workaround: 1; /* Workaround for some laptops to avoid freeze */
 229         unsigned int reset_workaround_2: 1; /* Extended workaround for some other laptops to avoid freeze */
 230         unsigned int in_resume: 1;
 231
 232         int mixer_base;                 /* register offset of ac97 mixer */
 233         int mixer_status_offset;        /* offset of mixer status reg. */
 234         int mixer_status_mask;          /* bit mask to test the mixer status */
 235
 236         int irq;
 237         int irq_acks;
 238         irq_handler_t interrupt;
 239         int badintrcount;               /* counter to check bogus interrupts */
 240         struct mutex irq_mutex;
 241
 242         struct nm256_stream streams[2];
 243
 244         struct snd_ac97 *ac97;
 245         unsigned short *ac97_regs; /* register caches, only for valid regs */
 246
 247         struct snd_pcm *pcm;
 248
 249         struct pci_dev *pci;
 250
 251         spinlock_t reg_lock;
 252
 253 };
 254
 255
 256 /*
 257  * include coefficient table
 258  */
 259 #include "nm256_coef.c"
 260
 261
 262 /*
 263  * PCI ids
 264  */
 265 static const struct pci_device_id snd_nm256_ids[] = {
 266         {PCI_VDEVICE(NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO), 0},
 267         {PCI_VDEVICE(NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO), 0},
 268         {PCI_VDEVICE(NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO), 0},
 269         {0,},
 270 };
 271
 272 MODULE_DEVICE_TABLE(pci, snd_nm256_ids);
 273
 274
 275 /*
 276  * lowlvel stuffs
 277  */
 278
 279 static inline u8
 280 snd_nm256_readb(struct nm256 *chip, int offset)
 281 {
 282         return readb(chip->cport + offset);
 283 }
 284
 285 static inline u16
 286 snd_nm256_readw(struct nm256 *chip, int offset)
 287 {
 288         return readw(chip->cport + offset);
 289 }
 290
 291 static inline u32
 292 snd_nm256_readl(struct nm256 *chip, int offset)
 293 {
 294         return readl(chip->cport + offset);
 295 }
 296
 297 static inline void
 298 snd_nm256_writeb(struct nm256 *chip, int offset, u8 val)
 299 {
 300         writeb(val, chip->cport + offset);
 301 }
 302
 303 static inline void
 304 snd_nm256_writew(struct nm256 *chip, int offset, u16 val)
 305 {
 306         writew(val, chip->cport + offset);
 307 }
 308
 309 static inline void
 310 snd_nm256_writel(struct nm256 *chip, int offset, u32 val)
 311 {
 312         writel(val, chip->cport + offset);
 313 }
 314
 315 static inline void
 316 snd_nm256_write_buffer(struct nm256 *chip, void *src, int offset, int size)
 317 {
 318         offset -= chip->buffer_start;
 319 #ifdef CONFIG_SND_DEBUG
 320         if (offset < 0 || offset >= chip->buffer_size) {
 321                 dev_err(chip->card->dev,
 322                         "write_buffer invalid offset = %d size = %d\n",
 323                            offset, size);
 324                 return;
 325         }
 326 #endif
 327         memcpy_toio(chip->buffer + offset, src, size);
 328 }
 329
 330 /*
 331  * coefficient handlers -- what a magic!
 332  */
 333
 334 static u16
 335 snd_nm256_get_start_offset(int which)
 336 {
 337         u16 offset = 0;
 338         while (which-- > 0)
 339                 offset += coefficient_sizes[which];
 340         return offset;
 341 }
 342
 343 static void
 344 snd_nm256_load_one_coefficient(struct nm256 *chip, int stream, u32 port, int which)
 345 {
 346         u32 coeff_buf = chip->coeff_buf[stream];
 347         u16 offset = snd_nm256_get_start_offset(which);
 348         u16 size = coefficient_sizes[which];
 349
 350         snd_nm256_write_buffer(chip, coefficients + offset, coeff_buf, size);
 351         snd_nm256_writel(chip, port, coeff_buf);
 352         /* ???  Record seems to behave differently than playback.  */
 353         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 354                 size--;
 355         snd_nm256_writel(chip, port + 4, coeff_buf + size);
 356 }
 357
 358 static void
 359 snd_nm256_load_coefficient(struct nm256 *chip, int stream, int number)
 360 {
 361         /* The enable register for the specified engine.  */
 362         u32 poffset = (stream == SNDRV_PCM_STREAM_CAPTURE ?
 363                        NM_RECORD_ENABLE_REG : NM_PLAYBACK_ENABLE_REG);
 364         u32 addr = NM_COEFF_START_OFFSET;
 365
 366         addr += (stream == SNDRV_PCM_STREAM_CAPTURE ?
 367                  NM_RECORD_REG_OFFSET : NM_PLAYBACK_REG_OFFSET);
 368
 369         if (snd_nm256_readb(chip, poffset) & 1) {
 370                 dev_dbg(chip->card->dev,
 371                         "NM256: Engine was enabled while loading coefficients!\n");
 372                 return;
 373         }
 374
 375         /* The recording engine uses coefficient values 8-15.  */
 376         number &= 7;
 377         if (stream == SNDRV_PCM_STREAM_CAPTURE)
 378                 number += 8;
 379
 380         if (! chip->use_cache) {
 381                 snd_nm256_load_one_coefficient(chip, stream, addr, number);
 382                 return;
 383         }
 384         if (! chip->coeffs_current) {
 385                 snd_nm256_write_buffer(chip, coefficients, chip->all_coeff_buf,
 386                                        NM_TOTAL_COEFF_COUNT * 4);
 387                 chip->coeffs_current = 1;
 388         } else {
 389                 u32 base = chip->all_coeff_buf;
 390                 u32 offset = snd_nm256_get_start_offset(number);
 391                 u32 end_offset = offset + coefficient_sizes[number];
 392                 snd_nm256_writel(chip, addr, base + offset);
 393                 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 394                         end_offset--;
 395                 snd_nm256_writel(chip, addr + 4, base + end_offset);
 396         }
 397 }
 398
 399
 400 /* The actual rates supported by the card. */
 401 static unsigned int samplerates[8] = {
 402         8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000,
 403 };
 404 static struct snd_pcm_hw_constraint_list constraints_rates = {
 405         .count = ARRAY_SIZE(samplerates),
 406         .list = samplerates,
 407         .mask = 0,
 408 };
 409
 410 /*
 411  * return the index of the target rate
 412  */
 413 static int
 414 snd_nm256_fixed_rate(unsigned int rate)
 415 {
 416         unsigned int i;
 417         for (i = 0; i < ARRAY_SIZE(samplerates); i++) {
 418                 if (rate == samplerates[i])
 419                         return i;
 420         }
 421         snd_BUG();
 422         return 0;
 423 }
 424
 425 /*
 426  * set sample rate and format
 427  */
 428 static void
 429 snd_nm256_set_format(struct nm256 *chip, struct nm256_stream *s,
 430                      struct snd_pcm_substream *substream)
 431 {
 432         struct snd_pcm_runtime *runtime = substream->runtime;
 433         int rate_index = snd_nm256_fixed_rate(runtime->rate);
 434         unsigned char ratebits = (rate_index << 4) & NM_RATE_MASK;
 435
 436         s->shift = 0;
 437         if (snd_pcm_format_width(runtime->format) == 16) {
 438                 ratebits |= NM_RATE_BITS_16;
 439                 s->shift++;
 440         }
 441         if (runtime->channels > 1) {
 442                 ratebits |= NM_RATE_STEREO;
 443                 s->shift++;
 444         }
 445
 446         runtime->rate = samplerates[rate_index];
 447
 448         switch (substream->stream) {
 449         case SNDRV_PCM_STREAM_PLAYBACK:
 450                 snd_nm256_load_coefficient(chip, 0, rate_index); /* 0 = playback */
 451                 snd_nm256_writeb(chip,
 452                                  NM_PLAYBACK_REG_OFFSET + NM_RATE_REG_OFFSET,
 453                                  ratebits);
 454                 break;
 455         case SNDRV_PCM_STREAM_CAPTURE:
 456                 snd_nm256_load_coefficient(chip, 1, rate_index); /* 1 = record */
 457                 snd_nm256_writeb(chip,
 458                                  NM_RECORD_REG_OFFSET + NM_RATE_REG_OFFSET,
 459                                  ratebits);
 460                 break;
 461         }
 462 }
 463
 464 /* acquire interrupt */
 465 static int snd_nm256_acquire_irq(struct nm256 *chip)
 466 {
 467         mutex_lock(&chip->irq_mutex);
 468         if (chip->irq < 0) {
 469                 if (request_irq(chip->pci->irq, chip->interrupt, IRQF_SHARED,
 470                                 KBUILD_MODNAME, chip)) {
 471                         dev_err(chip->card->dev,
 472                                 "unable to grab IRQ %d\n", chip->pci->irq);
 473                         mutex_unlock(&chip->irq_mutex);
 474                         return -EBUSY;
 475                 }
 476                 chip->irq = chip->pci->irq;
 477         }
 478         chip->irq_acks++;
 479         mutex_unlock(&chip->irq_mutex);
 480         return 0;
 481 }
 482
 483 /* release interrupt */
 484 static void snd_nm256_release_irq(struct nm256 *chip)
 485 {
 486         mutex_lock(&chip->irq_mutex);
 487         if (chip->irq_acks > 0)
 488                 chip->irq_acks--;
 489         if (chip->irq_acks == 0 && chip->irq >= 0) {
 490                 free_irq(chip->irq, chip);
 491                 chip->irq = -1;
 492         }
 493         mutex_unlock(&chip->irq_mutex);
 494 }
 495
 496 /*
 497  * start / stop
 498  */
 499
 500 /* update the watermark (current period) */
 501 static void snd_nm256_pcm_mark(struct nm256 *chip, struct nm256_stream *s, int reg)
 502 {
 503         s->cur_period++;
 504         s->cur_period %= s->periods;
 505         snd_nm256_writel(chip, reg, s->buf + s->cur_period * s->period_size);
 506 }
 507
 508 #define snd_nm256_playback_mark(chip, s) snd_nm256_pcm_mark(chip, s, NM_PBUFFER_WMARK)
 509 #define snd_nm256_capture_mark(chip, s)  snd_nm256_pcm_mark(chip, s, NM_RBUFFER_WMARK)
 510
 511 static void
 512 snd_nm256_playback_start(struct nm256 *chip, struct nm256_stream *s,
 513                          struct snd_pcm_substream *substream)
 514 {
 515         /* program buffer pointers */
 516         snd_nm256_writel(chip, NM_PBUFFER_START, s->buf);
 517         snd_nm256_writel(chip, NM_PBUFFER_END, s->buf + s->dma_size - (1 << s->shift));
 518         snd_nm256_writel(chip, NM_PBUFFER_CURRP, s->buf);
 519         snd_nm256_playback_mark(chip, s);
 520
 521         /* Enable playback engine and interrupts. */
 522         snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG,
 523                          NM_PLAYBACK_ENABLE_FLAG | NM_PLAYBACK_FREERUN);
 524         /* Enable both channels. */
 525         snd_nm256_writew(chip, NM_AUDIO_MUTE_REG, 0x0);
 526 }
 527
 528 static void
 529 snd_nm256_capture_start(struct nm256 *chip, struct nm256_stream *s,
 530                         struct snd_pcm_substream *substream)
 531 {
 532         /* program buffer pointers */
 533         snd_nm256_writel(chip, NM_RBUFFER_START, s->buf);
 534         snd_nm256_writel(chip, NM_RBUFFER_END, s->buf + s->dma_size);
 535         snd_nm256_writel(chip, NM_RBUFFER_CURRP, s->buf);
 536         snd_nm256_capture_mark(chip, s);
 537
 538         /* Enable playback engine and interrupts. */
 539         snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG,
 540                          NM_RECORD_ENABLE_FLAG | NM_RECORD_FREERUN);
 541 }
 542
 543 /* Stop the play engine. */
 544 static void
 545 snd_nm256_playback_stop(struct nm256 *chip)
 546 {
 547         /* Shut off sound from both channels. */
 548         snd_nm256_writew(chip, NM_AUDIO_MUTE_REG,
 549                          NM_AUDIO_MUTE_LEFT | NM_AUDIO_MUTE_RIGHT);
 550         /* Disable play engine. */
 551         snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG, 0);
 552 }
 553
 554 static void
 555 snd_nm256_capture_stop(struct nm256 *chip)
 556 {
 557         /* Disable recording engine. */
 558         snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG, 0);
 559 }
 560
 561 static int
 562 snd_nm256_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 563 {
 564         struct nm256 *chip = snd_pcm_substream_chip(substream);
 565         struct nm256_stream *s = substream->runtime->private_data;
 566         int err = 0;
 567
 568         if (snd_BUG_ON(!s))
 569                 return -ENXIO;
 570
 571         spin_lock(&chip->reg_lock);
 572         switch (cmd) {
 573         case SNDRV_PCM_TRIGGER_RESUME:
 574                 s->suspended = 0;
 575                 /* fallthru */
 576         case SNDRV_PCM_TRIGGER_START:
 577                 if (! s->running) {
 578                         snd_nm256_playback_start(chip, s, substream);
 579                         s->running = 1;
 580                 }
 581                 break;
 582         case SNDRV_PCM_TRIGGER_SUSPEND:
 583                 s->suspended = 1;
 584                 /* fallthru */
 585         case SNDRV_PCM_TRIGGER_STOP:
 586                 if (s->running) {
 587                         snd_nm256_playback_stop(chip);
 588                         s->running = 0;
 589                 }
 590                 break;
 591         default:
 592                 err = -EINVAL;
 593                 break;
 594         }
 595         spin_unlock(&chip->reg_lock);
 596         return err;
 597 }
 598
 599 static int
 600 snd_nm256_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 601 {
 602         struct nm256 *chip = snd_pcm_substream_chip(substream);
 603         struct nm256_stream *s = substream->runtime->private_data;
 604         int err = 0;
 605
 606         if (snd_BUG_ON(!s))
 607                 return -ENXIO;
 608
 609         spin_lock(&chip->reg_lock);
 610         switch (cmd) {
 611         case SNDRV_PCM_TRIGGER_START:
 612         case SNDRV_PCM_TRIGGER_RESUME:
 613                 if (! s->running) {
 614                         snd_nm256_capture_start(chip, s, substream);
 615                         s->running = 1;
 616                 }
 617                 break;
 618         case SNDRV_PCM_TRIGGER_STOP:
 619         case SNDRV_PCM_TRIGGER_SUSPEND:
 620                 if (s->running) {
 621                         snd_nm256_capture_stop(chip);
 622                         s->running = 0;
 623                 }
 624                 break;
 625         default:
 626                 err = -EINVAL;
 627                 break;
 628         }
 629         spin_unlock(&chip->reg_lock);
 630         return err;
 631 }
 632
 633
 634 /*
 635  * prepare playback/capture channel
 636  */
 637 static int snd_nm256_pcm_prepare(struct snd_pcm_substream *substream)
 638 {
 639         struct nm256 *chip = snd_pcm_substream_chip(substream);
 640         struct snd_pcm_runtime *runtime = substream->runtime;
 641         struct nm256_stream *s = runtime->private_data;
 642
 643         if (snd_BUG_ON(!s))
 644                 return -ENXIO;
 645         s->dma_size = frames_to_bytes(runtime, substream->runtime->buffer_size);
 646         s->period_size = frames_to_bytes(runtime, substream->runtime->period_size);
 647         s->periods = substream->runtime->periods;
 648         s->cur_period = 0;
 649
 650         spin_lock_irq(&chip->reg_lock);
 651         s->running = 0;
 652         snd_nm256_set_format(chip, s, substream);
 653         spin_unlock_irq(&chip->reg_lock);
 654
 655         return 0;
 656 }
 657
 658
 659 /*
 660  * get the current pointer
 661  */
 662 static snd_pcm_uframes_t
 663 snd_nm256_playback_pointer(struct snd_pcm_substream *substream)
 664 {
 665         struct nm256 *chip = snd_pcm_substream_chip(substream);
 666         struct nm256_stream *s = substream->runtime->private_data;
 667         unsigned long curp;
 668
 669         if (snd_BUG_ON(!s))
 670                 return 0;
 671         curp = snd_nm256_readl(chip, NM_PBUFFER_CURRP) - (unsigned long)s->buf;
 672         curp %= s->dma_size;
 673         return bytes_to_frames(substream->runtime, curp);
 674 }
 675
 676 static snd_pcm_uframes_t
 677 snd_nm256_capture_pointer(struct snd_pcm_substream *substream)
 678 {
 679         struct nm256 *chip = snd_pcm_substream_chip(substream);
 680         struct nm256_stream *s = substream->runtime->private_data;
 681         unsigned long curp;
 682
 683         if (snd_BUG_ON(!s))
 684                 return 0;
 685         curp = snd_nm256_readl(chip, NM_RBUFFER_CURRP) - (unsigned long)s->buf;
 686         curp %= s->dma_size;
 687         return bytes_to_frames(substream->runtime, curp);
 688 }
 689
 690 /* Remapped I/O space can be accessible as pointer on i386 */
 691 /* This might be changed in the future */
 692 #ifndef __i386__
 693 /*
 694  * silence / copy for playback
 695  */
 696 static int
 697 snd_nm256_playback_silence(struct snd_pcm_substream *substream,
 698                            int channel, /* not used (interleaved data) */
 699                            snd_pcm_uframes_t pos,
 700                            snd_pcm_uframes_t count)
 701 {
 702         struct snd_pcm_runtime *runtime = substream->runtime;
 703         struct nm256_stream *s = runtime->private_data;
 704         count = frames_to_bytes(runtime, count);
 705         pos = frames_to_bytes(runtime, pos);
 706         memset_io(s->bufptr + pos, 0, count);
 707         return 0;
 708 }
 709
 710 static int
 711 snd_nm256_playback_copy(struct snd_pcm_substream *substream,
 712                         int channel, /* not used (interleaved data) */
 713                         snd_pcm_uframes_t pos,
 714                         void __user *src,
 715                         snd_pcm_uframes_t count)
 716 {
 717         struct snd_pcm_runtime *runtime = substream->runtime;
 718         struct nm256_stream *s = runtime->private_data;
 719         count = frames_to_bytes(runtime, count);
 720         pos = frames_to_bytes(runtime, pos);
 721         if (copy_from_user_toio(s->bufptr + pos, src, count))
 722                 return -EFAULT;
 723         return 0;
 724 }
 725
 726 /*
 727  * copy to user
 728  */
 729 static int
 730 snd_nm256_capture_copy(struct snd_pcm_substream *substream,
 731                        int channel, /* not used (interleaved data) */
 732                        snd_pcm_uframes_t pos,
 733                        void __user *dst,
 734                        snd_pcm_uframes_t count)
 735 {
 736         struct snd_pcm_runtime *runtime = substream->runtime;
 737         struct nm256_stream *s = runtime->private_data;
 738         count = frames_to_bytes(runtime, count);
 739         pos = frames_to_bytes(runtime, pos);
 740         if (copy_to_user_fromio(dst, s->bufptr + pos, count))
 741                 return -EFAULT;
 742         return 0;
 743 }
 744
 745 #endif /* !__i386__ */
 746
 747
 748 /*
 749  * update playback/capture watermarks
 750  */
 751
 752 /* spinlock held! */
 753 static void
 754 snd_nm256_playback_update(struct nm256 *chip)
 755 {
 756         struct nm256_stream *s;
 757
 758         s = &chip->streams[SNDRV_PCM_STREAM_PLAYBACK];
 759         if (s->running && s->substream) {
 760                 spin_unlock(&chip->reg_lock);
 761                 snd_pcm_period_elapsed(s->substream);
 762                 spin_lock(&chip->reg_lock);
 763                 snd_nm256_playback_mark(chip, s);
 764         }
 765 }
 766
 767 /* spinlock held! */
 768 static void
 769 snd_nm256_capture_update(struct nm256 *chip)
 770 {
 771         struct nm256_stream *s;
 772
 773         s = &chip->streams[SNDRV_PCM_STREAM_CAPTURE];
 774         if (s->running && s->substream) {
 775                 spin_unlock(&chip->reg_lock);
 776                 snd_pcm_period_elapsed(s->substream);
 777                 spin_lock(&chip->reg_lock);
 778                 snd_nm256_capture_mark(chip, s);
 779         }
 780 }
 781
 782 /*
 783  * hardware info
 784  */
 785 static struct snd_pcm_hardware snd_nm256_playback =
 786 {
 787         .info =                 SNDRV_PCM_INFO_MMAP_IOMEM |SNDRV_PCM_INFO_MMAP_VALID |
 788                                 SNDRV_PCM_INFO_INTERLEAVED |
 789                                 /*SNDRV_PCM_INFO_PAUSE |*/
 790                                 SNDRV_PCM_INFO_RESUME,
 791         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
 792         .rates =                SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
 793         .rate_min =             8000,
 794         .rate_max =             48000,
 795         .channels_min =         1,
 796         .channels_max =         2,
 797         .periods_min =          2,
 798         .periods_max =          1024,
 799         .buffer_bytes_max =     128 * 1024,
 800         .period_bytes_min =     256,
 801         .period_bytes_max =     128 * 1024,
 802 };
 803
 804 static struct snd_pcm_hardware snd_nm256_capture =
 805 {
 806         .info =                 SNDRV_PCM_INFO_MMAP_IOMEM | SNDRV_PCM_INFO_MMAP_VALID |
 807                                 SNDRV_PCM_INFO_INTERLEAVED |
 808                                 /*SNDRV_PCM_INFO_PAUSE |*/
 809                                 SNDRV_PCM_INFO_RESUME,
 810         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
 811         .rates =                SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
 812         .rate_min =             8000,
 813         .rate_max =             48000,
 814         .channels_min =         1,
 815         .channels_max =         2,
 816         .periods_min =          2,
 817         .periods_max =          1024,
 818         .buffer_bytes_max =     128 * 1024,
 819         .period_bytes_min =     256,
 820         .period_bytes_max =     128 * 1024,
 821 };
 822
 823
 824 /* set dma transfer size */
 825 static int snd_nm256_pcm_hw_params(struct snd_pcm_substream *substream,
 826                                    struct snd_pcm_hw_params *hw_params)
 827 {
 828         /* area and addr are already set and unchanged */
 829         substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
 830         return 0;
 831 }
 832
 833 /*
 834  * open
 835  */
 836 static void snd_nm256_setup_stream(struct nm256 *chip, struct nm256_stream *s,
 837                                    struct snd_pcm_substream *substream,
 838                                    struct snd_pcm_hardware *hw_ptr)
 839 {
 840         struct snd_pcm_runtime *runtime = substream->runtime;
 841
 842         s->running = 0;
 843         runtime->hw = *hw_ptr;
 844         runtime->hw.buffer_bytes_max = s->bufsize;
 845         runtime->hw.period_bytes_max = s->bufsize / 2;
 846         runtime->dma_area = (void __force *) s->bufptr;
 847         runtime->dma_addr = s->bufptr_addr;
 848         runtime->dma_bytes = s->bufsize;
 849         runtime->private_data = s;
 850         s->substream = substream;
 851
 852         snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 853                                    &constraints_rates);
 854 }
 855
 856 static int
 857 snd_nm256_playback_open(struct snd_pcm_substream *substream)
 858 {
 859         struct nm256 *chip = snd_pcm_substream_chip(substream);
 860
 861         if (snd_nm256_acquire_irq(chip) < 0)
 862                 return -EBUSY;
 863         snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_PLAYBACK],
 864                                substream, &snd_nm256_playback);
 865         return 0;
 866 }
 867
 868 static int
 869 snd_nm256_capture_open(struct snd_pcm_substream *substream)
 870 {
 871         struct nm256 *chip = snd_pcm_substream_chip(substream);
 872
 873         if (snd_nm256_acquire_irq(chip) < 0)
 874                 return -EBUSY;
 875         snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_CAPTURE],
 876                                substream, &snd_nm256_capture);
 877         return 0;
 878 }
 879
 880 /*
 881  * close - we don't have to do special..
 882  */
 883 static int
 884 snd_nm256_playback_close(struct snd_pcm_substream *substream)
 885 {
 886         struct nm256 *chip = snd_pcm_substream_chip(substream);
 887
 888         snd_nm256_release_irq(chip);
 889         return 0;
 890 }
 891
 892
 893 static int
 894 snd_nm256_capture_close(struct snd_pcm_substream *substream)
 895 {
 896         struct nm256 *chip = snd_pcm_substream_chip(substream);
 897
 898         snd_nm256_release_irq(chip);
 899         return 0;
 900 }
 901
 902 /*
 903  * create a pcm instance
 904  */
 905 static struct snd_pcm_ops snd_nm256_playback_ops = {
 906         .open =         snd_nm256_playback_open,
 907         .close =        snd_nm256_playback_close,
 908         .ioctl =        snd_pcm_lib_ioctl,
 909         .hw_params =    snd_nm256_pcm_hw_params,
 910         .prepare =      snd_nm256_pcm_prepare,
 911         .trigger =      snd_nm256_playback_trigger,
 912         .pointer =      snd_nm256_playback_pointer,
 913 #ifndef __i386__
 914         .copy =         snd_nm256_playback_copy,
 915         .silence =      snd_nm256_playback_silence,
 916 #endif
 917         .mmap =         snd_pcm_lib_mmap_iomem,
 918 };
 919
 920 static struct snd_pcm_ops snd_nm256_capture_ops = {
 921         .open =         snd_nm256_capture_open,
 922         .close =        snd_nm256_capture_close,
 923         .ioctl =        snd_pcm_lib_ioctl,
 924         .hw_params =    snd_nm256_pcm_hw_params,
 925         .prepare =      snd_nm256_pcm_prepare,
 926         .trigger =      snd_nm256_capture_trigger,
 927         .pointer =      snd_nm256_capture_pointer,
 928 #ifndef __i386__
 929         .copy =         snd_nm256_capture_copy,
 930 #endif
 931         .mmap =         snd_pcm_lib_mmap_iomem,
 932 };
 933
 934 static int
 935 snd_nm256_pcm(struct nm256 *chip, int device)
 936 {
 937         struct snd_pcm *pcm;
 938         int i, err;
 939
 940         for (i = 0; i < 2; i++) {
 941                 struct nm256_stream *s = &chip->streams[i];
 942                 s->bufptr = chip->buffer + (s->buf - chip->buffer_start);
 943                 s->bufptr_addr = chip->buffer_addr + (s->buf - chip->buffer_start);
 944         }
 945
 946         err = snd_pcm_new(chip->card, chip->card->driver, device,
 947                           1, 1, &pcm);
 948         if (err < 0)
 949                 return err;
 950
 951         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_nm256_playback_ops);
 952         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_nm256_capture_ops);
 953
 954         pcm->private_data = chip;
 955         pcm->info_flags = 0;
 956         chip->pcm = pcm;
 957
 958         return 0;
 959 }
 960
 961
 962 /*
 963  * Initialize the hardware.
 964  */
 965 static void
 966 snd_nm256_init_chip(struct nm256 *chip)
 967 {
 968         /* Reset everything. */
 969         snd_nm256_writeb(chip, 0x0, 0x11);
 970         snd_nm256_writew(chip, 0x214, 0);
 971         /* stop sounds.. */
 972         //snd_nm256_playback_stop(chip);
 973         //snd_nm256_capture_stop(chip);
 974 }
 975
 976
 977 static irqreturn_t
 978 snd_nm256_intr_check(struct nm256 *chip)
 979 {
 980         if (chip->badintrcount++ > 1000) {
 981                 /*
 982                  * I'm not sure if the best thing is to stop the card from
 983                  * playing or just release the interrupt (after all, we're in
 984                  * a bad situation, so doing fancy stuff may not be such a good
 985                  * idea).
 986                  *
 987                  * I worry about the card engine continuing to play noise
 988                  * over and over, however--that could become a very
 989                  * obnoxious problem.  And we know that when this usually
 990                  * happens things are fairly safe, it just means the user's
 991                  * inserted a PCMCIA card and someone's spamming us with IRQ 9s.
 992                  */
 993                 if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
 994                         snd_nm256_playback_stop(chip);
 995                 if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
 996                         snd_nm256_capture_stop(chip);
 997                 chip->badintrcount = 0;
 998                 return IRQ_HANDLED;
 999         }
1000         return IRQ_NONE;
1001 }
1002
1003 /*
1004  * Handle a potential interrupt for the device referred to by DEV_ID.
1005  *
1006  * I don't like the cut-n-paste job here either between the two routines,
1007  * but there are sufficient differences between the two interrupt handlers
1008  * that parameterizing it isn't all that great either.  (Could use a macro,
1009  * I suppose...yucky bleah.)
1010  */
1011
1012 static irqreturn_t
1013 snd_nm256_interrupt(int irq, void *dev_id)
1014 {
1015         struct nm256 *chip = dev_id;
1016         u16 status;
1017         u8 cbyte;
1018
1019         status = snd_nm256_readw(chip, NM_INT_REG);
1020
1021         /* Not ours. */
1022         if (status == 0)
1023                 return snd_nm256_intr_check(chip);
1024
1025         chip->badintrcount = 0;
1026
1027         /* Rather boring; check for individual interrupts and process them. */
1028
1029         spin_lock(&chip->reg_lock);
1030         if (status & NM_PLAYBACK_INT) {
1031                 status &= ~NM_PLAYBACK_INT;
1032                 NM_ACK_INT(chip, NM_PLAYBACK_INT);
1033                 snd_nm256_playback_update(chip);
1034         }
1035
1036         if (status & NM_RECORD_INT) {
1037                 status &= ~NM_RECORD_INT;
1038                 NM_ACK_INT(chip, NM_RECORD_INT);
1039                 snd_nm256_capture_update(chip);
1040         }
1041
1042         if (status & NM_MISC_INT_1) {
1043                 status &= ~NM_MISC_INT_1;
1044                 NM_ACK_INT(chip, NM_MISC_INT_1);
1045                 dev_dbg(chip->card->dev, "NM256: Got misc interrupt #1\n");
1046                 snd_nm256_writew(chip, NM_INT_REG, 0x8000);
1047                 cbyte = snd_nm256_readb(chip, 0x400);
1048                 snd_nm256_writeb(chip, 0x400, cbyte | 2);
1049         }
1050
1051         if (status & NM_MISC_INT_2) {
1052                 status &= ~NM_MISC_INT_2;
1053                 NM_ACK_INT(chip, NM_MISC_INT_2);
1054                 dev_dbg(chip->card->dev, "NM256: Got misc interrupt #2\n");
1055                 cbyte = snd_nm256_readb(chip, 0x400);
1056                 snd_nm256_writeb(chip, 0x400, cbyte & ~2);
1057         }
1058
1059         /* Unknown interrupt. */
1060         if (status) {
1061                 dev_dbg(chip->card->dev,
1062                         "NM256: Fire in the hole! Unknown status 0x%x\n",
1063                            status);
1064                 /* Pray. */
1065                 NM_ACK_INT(chip, status);
1066         }
1067
1068         spin_unlock(&chip->reg_lock);
1069         return IRQ_HANDLED;
1070 }
1071
1072 /*
1073  * Handle a potential interrupt for the device referred to by DEV_ID.
1074  * This handler is for the 256ZX, and is very similar to the non-ZX
1075  * routine.
1076  */
1077
1078 static irqreturn_t
1079 snd_nm256_interrupt_zx(int irq, void *dev_id)
1080 {
1081         struct nm256 *chip = dev_id;
1082         u32 status;
1083         u8 cbyte;
1084
1085         status = snd_nm256_readl(chip, NM_INT_REG);
1086
1087         /* Not ours. */
1088         if (status == 0)
1089                 return snd_nm256_intr_check(chip);
1090
1091         chip->badintrcount = 0;
1092
1093         /* Rather boring; check for individual interrupts and process them. */
1094
1095         spin_lock(&chip->reg_lock);
1096         if (status & NM2_PLAYBACK_INT) {
1097                 status &= ~NM2_PLAYBACK_INT;
1098                 NM2_ACK_INT(chip, NM2_PLAYBACK_INT);
1099                 snd_nm256_playback_update(chip);
1100         }
1101
1102         if (status & NM2_RECORD_INT) {
1103                 status &= ~NM2_RECORD_INT;
1104                 NM2_ACK_INT(chip, NM2_RECORD_INT);
1105                 snd_nm256_capture_update(chip);
1106         }
1107
1108         if (status & NM2_MISC_INT_1) {
1109                 status &= ~NM2_MISC_INT_1;
1110                 NM2_ACK_INT(chip, NM2_MISC_INT_1);
1111                 dev_dbg(chip->card->dev, "NM256: Got misc interrupt #1\n");
1112                 cbyte = snd_nm256_readb(chip, 0x400);
1113                 snd_nm256_writeb(chip, 0x400, cbyte | 2);
1114         }
1115
1116         if (status & NM2_MISC_INT_2) {
1117                 status &= ~NM2_MISC_INT_2;
1118                 NM2_ACK_INT(chip, NM2_MISC_INT_2);
1119                 dev_dbg(chip->card->dev, "NM256: Got misc interrupt #2\n");
1120                 cbyte = snd_nm256_readb(chip, 0x400);
1121                 snd_nm256_writeb(chip, 0x400, cbyte & ~2);
1122         }
1123
1124         /* Unknown interrupt. */
1125         if (status) {
1126                 dev_dbg(chip->card->dev,
1127                         "NM256: Fire in the hole! Unknown status 0x%x\n",
1128                            status);
1129                 /* Pray. */
1130                 NM2_ACK_INT(chip, status);
1131         }
1132
1133         spin_unlock(&chip->reg_lock);
1134         return IRQ_HANDLED;
1135 }
1136
1137 /*
1138  * AC97 interface
1139  */
1140
1141 /*
1142  * Waits for the mixer to become ready to be written; returns a zero value
1143  * if it timed out.
1144  */
1145 static int
1146 snd_nm256_ac97_ready(struct nm256 *chip)
1147 {
1148         int timeout = 10;
1149         u32 testaddr;
1150         u16 testb;
1151
1152         testaddr = chip->mixer_status_offset;
1153         testb = chip->mixer_status_mask;
1154
1155         /*
1156          * Loop around waiting for the mixer to become ready.
1157          */
1158         while (timeout-- > 0) {
1159                 if ((snd_nm256_readw(chip, testaddr) & testb) == 0)
1160                         return 1;
1161                 udelay(100);
1162         }
1163         return 0;
1164 }
1165
1166 /*
1167  * Initial register values to be written to the AC97 mixer.
1168  * While most of these are identical to the reset values, we do this
1169  * so that we have most of the register contents cached--this avoids
1170  * reading from the mixer directly (which seems to be problematic,
1171  * probably due to ignorance).
1172  */
1173
1174 struct initialValues {
1175         unsigned short reg;
1176         unsigned short value;
1177 };
1178
1179 static struct initialValues nm256_ac97_init_val[] =
1180 {
1181         { AC97_MASTER,          0x8000 },
1182         { AC97_HEADPHONE,       0x8000 },
1183         { AC97_MASTER_MONO,     0x8000 },
1184         { AC97_PC_BEEP,         0x8000 },
1185         { AC97_PHONE,           0x8008 },
1186         { AC97_MIC,             0x8000 },
1187         { AC97_LINE,            0x8808 },
1188         { AC97_CD,              0x8808 },
1189         { AC97_VIDEO,           0x8808 },
1190         { AC97_AUX,             0x8808 },
1191         { AC97_PCM,             0x8808 },
1192         { AC97_REC_SEL,         0x0000 },
1193         { AC97_REC_GAIN,        0x0B0B },
1194         { AC97_GENERAL_PURPOSE, 0x0000 },
1195         { AC97_3D_CONTROL,      0x8000 },
1196         { AC97_VENDOR_ID1,      0x8384 },
1197         { AC97_VENDOR_ID2,      0x7609 },
1198 };
1199
1200 static int nm256_ac97_idx(unsigned short reg)
1201 {
1202         int i;
1203         for (i = 0; i < ARRAY_SIZE(nm256_ac97_init_val); i++)
1204                 if (nm256_ac97_init_val[i].reg == reg)
1205                         return i;
1206         return -1;
1207 }
1208
1209 /*
1210  * some nm256 easily crash when reading from mixer registers
1211  * thus we're treating it as a write-only mixer and cache the
1212  * written values
1213  */
1214 static unsigned short
1215 snd_nm256_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
1216 {
1217         struct nm256 *chip = ac97->private_data;
1218         int idx = nm256_ac97_idx(reg);
1219
1220         if (idx < 0)
1221                 return 0;
1222         return chip->ac97_regs[idx];
1223 }
1224
1225 /*
1226  */
1227 static void
1228 snd_nm256_ac97_write(struct snd_ac97 *ac97,
1229                      unsigned short reg, unsigned short val)
1230 {
1231         struct nm256 *chip = ac97->private_data;
1232         int tries = 2;
1233         int idx = nm256_ac97_idx(reg);
1234         u32 base;
1235
1236         if (idx < 0)
1237                 return;
1238
1239         base = chip->mixer_base;
1240
1241         snd_nm256_ac97_ready(chip);
1242
1243         /* Wait for the write to take, too. */
1244         while (tries-- > 0) {
1245                 snd_nm256_writew(chip, base + reg, val);
1246                 msleep(1);  /* a little delay here seems better.. */
1247                 if (snd_nm256_ac97_ready(chip)) {
1248                         /* successful write: set cache */
1249                         chip->ac97_regs[idx] = val;
1250                         return;
1251                 }
1252         }
1253         dev_dbg(chip->card->dev, "nm256: ac97 codec not ready..\n");
1254 }
1255
1256 /* static resolution table */
1257 static struct snd_ac97_res_table nm256_res_table[] = {
1258         { AC97_MASTER, 0x1f1f },
1259         { AC97_HEADPHONE, 0x1f1f },
1260         { AC97_MASTER_MONO, 0x001f },
1261         { AC97_PC_BEEP, 0x001f },
1262         { AC97_PHONE, 0x001f },
1263         { AC97_MIC, 0x001f },
1264         { AC97_LINE, 0x1f1f },
1265         { AC97_CD, 0x1f1f },
1266         { AC97_VIDEO, 0x1f1f },
1267         { AC97_AUX, 0x1f1f },
1268         { AC97_PCM, 0x1f1f },
1269         { AC97_REC_GAIN, 0x0f0f },
1270         { } /* terminator */
1271 };
1272
1273 /* initialize the ac97 into a known state */
1274 static void
1275 snd_nm256_ac97_reset(struct snd_ac97 *ac97)
1276 {
1277         struct nm256 *chip = ac97->private_data;
1278
1279         /* Reset the mixer.  'Tis magic!  */
1280         snd_nm256_writeb(chip, 0x6c0, 1);
1281         if (! chip->reset_workaround) {
1282                 /* Dell latitude LS will lock up by this */
1283                 snd_nm256_writeb(chip, 0x6cc, 0x87);
1284         }
1285         if (! chip->reset_workaround_2) {
1286                 /* Dell latitude CSx will lock up by this */
1287                 snd_nm256_writeb(chip, 0x6cc, 0x80);
1288                 snd_nm256_writeb(chip, 0x6cc, 0x0);
1289         }
1290         if (! chip->in_resume) {
1291                 int i;
1292                 for (i = 0; i < ARRAY_SIZE(nm256_ac97_init_val); i++) {
1293                         /* preload the cache, so as to avoid even a single
1294                          * read of the mixer regs
1295                          */
1296                         snd_nm256_ac97_write(ac97, nm256_ac97_init_val[i].reg,
1297                                              nm256_ac97_init_val[i].value);
1298                 }
1299         }
1300 }
1301
1302 /* create an ac97 mixer interface */
1303 static int
1304 snd_nm256_mixer(struct nm256 *chip)
1305 {
1306         struct snd_ac97_bus *pbus;
1307         struct snd_ac97_template ac97;
1308         int err;
1309         static struct snd_ac97_bus_ops ops = {
1310                 .reset = snd_nm256_ac97_reset,
1311                 .write = snd_nm256_ac97_write,
1312                 .read = snd_nm256_ac97_read,
1313         };
1314
1315         chip->ac97_regs = kcalloc(ARRAY_SIZE(nm256_ac97_init_val),
1316                                   sizeof(short), GFP_KERNEL);
1317         if (! chip->ac97_regs)
1318                 return -ENOMEM;
1319
1320         if ((err = snd_ac97_bus(chip->card, 0, &ops, NULL, &pbus)) < 0)
1321                 return err;
1322
1323         memset(&ac97, 0, sizeof(ac97));
1324         ac97.scaps = AC97_SCAP_AUDIO; /* we support audio! */
1325         ac97.private_data = chip;
1326         ac97.res_table = nm256_res_table;
1327         pbus->no_vra = 1;
1328         err = snd_ac97_mixer(pbus, &ac97, &chip->ac97);
1329         if (err < 0)
1330                 return err;
1331         if (! (chip->ac97->id & (0xf0000000))) {
1332                 /* looks like an invalid id */
1333                 sprintf(chip->card->mixername, "%s AC97", chip->card->driver);
1334         }
1335         return 0;
1336 }
1337
1338 /*
1339  * See if the signature left by the NM256 BIOS is intact; if so, we use
1340  * the associated address as the end of our audio buffer in the video
1341  * RAM.
1342  */
1343
1344 static int
1345 snd_nm256_peek_for_sig(struct nm256 *chip)
1346 {
1347         /* The signature is located 1K below the end of video RAM.  */
1348         void __iomem *temp;
1349         /* Default buffer end is 5120 bytes below the top of RAM.  */
1350         unsigned long pointer_found = chip->buffer_end - 0x1400;
1351         u32 sig;
1352
1353         temp = ioremap_nocache(chip->buffer_addr + chip->buffer_end - 0x400, 16);
1354         if (temp == NULL) {
1355                 dev_err(chip->card->dev,
1356                         "Unable to scan for card signature in video RAM\n");
1357                 return -EBUSY;
1358         }
1359
1360         sig = readl(temp);
1361         if ((sig & NM_SIG_MASK) == NM_SIGNATURE) {
1362                 u32 pointer = readl(temp + 4);
1363
1364                 /*
1365                  * If it's obviously invalid, don't use it
1366                  */
1367                 if (pointer == 0xffffffff ||
1368                     pointer < chip->buffer_size ||
1369                     pointer > chip->buffer_end) {
1370                         dev_err(chip->card->dev,
1371                                 "invalid signature found: 0x%x\n", pointer);
1372                         iounmap(temp);
1373                         return -ENODEV;
1374                 } else {
1375                         pointer_found = pointer;
1376                         dev_info(chip->card->dev,
1377                                  "found card signature in video RAM: 0x%x\n",
1378                                pointer);
1379                 }
1380         }
1381
1382         iounmap(temp);
1383         chip->buffer_end = pointer_found;
1384
1385         return 0;
1386 }
1387
1388 #ifdef CONFIG_PM_SLEEP
1389 /*
1390  * APM event handler, so the card is properly reinitialized after a power
1391  * event.
1392  */
1393 static int nm256_suspend(struct device *dev)
1394 {
1395         struct snd_card *card = dev_get_drvdata(dev);
1396         struct nm256 *chip = card->private_data;
1397
1398         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1399         snd_pcm_suspend_all(chip->pcm);
1400         snd_ac97_suspend(chip->ac97);
1401         chip->coeffs_current = 0;
1402         return 0;
1403 }
1404
1405 static int nm256_resume(struct device *dev)
1406 {
1407         struct snd_card *card = dev_get_drvdata(dev);
1408         struct nm256 *chip = card->private_data;
1409         int i;
1410
1411         /* Perform a full reset on the hardware */
1412         chip->in_resume = 1;
1413
1414         snd_nm256_init_chip(chip);
1415
1416         /* restore ac97 */
1417         snd_ac97_resume(chip->ac97);
1418
1419         for (i = 0; i < 2; i++) {
1420                 struct nm256_stream *s = &chip->streams[i];
1421                 if (s->substream && s->suspended) {
1422                         spin_lock_irq(&chip->reg_lock);
1423                         snd_nm256_set_format(chip, s, s->substream);
1424                         spin_unlock_irq(&chip->reg_lock);
1425                 }
1426         }
1427
1428         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1429         chip->in_resume = 0;
1430         return 0;
1431 }
1432
1433 static SIMPLE_DEV_PM_OPS(nm256_pm, nm256_suspend, nm256_resume);
1434 #define NM256_PM_OPS    &nm256_pm
1435 #else
1436 #define NM256_PM_OPS    NULL
1437 #endif /* CONFIG_PM_SLEEP */
1438
1439 static int snd_nm256_free(struct nm256 *chip)
1440 {
1441         if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
1442                 snd_nm256_playback_stop(chip);
1443         if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
1444                 snd_nm256_capture_stop(chip);
1445
1446         if (chip->irq >= 0)
1447                 free_irq(chip->irq, chip);
1448
1449         iounmap(chip->cport);
1450         iounmap(chip->buffer);
1451         release_and_free_resource(chip->res_cport);
1452         release_and_free_resource(chip->res_buffer);
1453
1454         pci_disable_device(chip->pci);
1455         kfree(chip->ac97_regs);
1456         kfree(chip);
1457         return 0;
1458 }
1459
1460 static int snd_nm256_dev_free(struct snd_device *device)
1461 {
1462         struct nm256 *chip = device->device_data;
1463         return snd_nm256_free(chip);
1464 }
1465
1466 static int
1467 snd_nm256_create(struct snd_card *card, struct pci_dev *pci,
1468                  struct nm256 **chip_ret)
1469 {
1470         struct nm256 *chip;
1471         int err, pval;
1472         static struct snd_device_ops ops = {
1473                 .dev_free =     snd_nm256_dev_free,
1474         };
1475         u32 addr;
1476
1477         *chip_ret = NULL;
1478
1479         if ((err = pci_enable_device(pci)) < 0)
1480                 return err;
1481
1482         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1483         if (chip == NULL) {
1484                 pci_disable_device(pci);
1485                 return -ENOMEM;
1486         }
1487
1488         chip->card = card;
1489         chip->pci = pci;
1490         chip->use_cache = use_cache;
1491         spin_lock_init(&chip->reg_lock);
1492         chip->irq = -1;
1493         mutex_init(&chip->irq_mutex);
1494
1495         /* store buffer sizes in bytes */
1496         chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize = playback_bufsize * 1024;
1497         chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize = capture_bufsize * 1024;
1498
1499         /*
1500          * The NM256 has two memory ports.  The first port is nothing
1501          * more than a chunk of video RAM, which is used as the I/O ring
1502          * buffer.  The second port has the actual juicy stuff (like the
1503          * mixer and the playback engine control registers).
1504          */
1505
1506         chip->buffer_addr = pci_resource_start(pci, 0);
1507         chip->cport_addr = pci_resource_start(pci, 1);
1508
1509         /* Init the memory port info.  */
1510         /* remap control port (#2) */
1511         chip->res_cport = request_mem_region(chip->cport_addr, NM_PORT2_SIZE,
1512                                              card->driver);
1513         if (chip->res_cport == NULL) {
1514                 dev_err(card->dev, "memory region 0x%lx (size 0x%x) busy\n",
1515                            chip->cport_addr, NM_PORT2_SIZE);
1516                 err = -EBUSY;
1517                 goto __error;
1518         }
1519         chip->cport = ioremap_nocache(chip->cport_addr, NM_PORT2_SIZE);
1520         if (chip->cport == NULL) {
1521                 dev_err(card->dev, "unable to map control port %lx\n",
1522                         chip->cport_addr);
1523                 err = -ENOMEM;
1524                 goto __error;
1525         }
1526
1527         if (!strcmp(card->driver, "NM256AV")) {
1528                 /* Ok, try to see if this is a non-AC97 version of the hardware. */
1529                 pval = snd_nm256_readw(chip, NM_MIXER_PRESENCE);
1530                 if ((pval & NM_PRESENCE_MASK) != NM_PRESENCE_VALUE) {
1531                         if (! force_ac97) {
1532                                 dev_err(card->dev,
1533                                         "no ac97 is found!\n");
1534                                 dev_err(card->dev,
1535                                         "force the driver to load by passing in the module parameter\n");
1536                                 dev_err(card->dev,
1537                                         " force_ac97=1\n");
1538                                 dev_err(card->dev,
1539                                         "or try sb16, opl3sa2, or cs423x drivers instead.\n");
1540                                 err = -ENXIO;
1541                                 goto __error;
1542                         }
1543                 }
1544                 chip->buffer_end = 2560 * 1024;
1545                 chip->interrupt = snd_nm256_interrupt;
1546                 chip->mixer_status_offset = NM_MIXER_STATUS_OFFSET;
1547                 chip->mixer_status_mask = NM_MIXER_READY_MASK;
1548         } else {
1549                 /* Not sure if there is any relevant detect for the ZX or not.  */
1550                 if (snd_nm256_readb(chip, 0xa0b) != 0)
1551                         chip->buffer_end = 6144 * 1024;
1552                 else
1553                         chip->buffer_end = 4096 * 1024;
1554
1555                 chip->interrupt = snd_nm256_interrupt_zx;
1556                 chip->mixer_status_offset = NM2_MIXER_STATUS_OFFSET;
1557                 chip->mixer_status_mask = NM2_MIXER_READY_MASK;
1558         }
1559
1560         chip->buffer_size = chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize +
1561                 chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
1562         if (chip->use_cache)
1563                 chip->buffer_size += NM_TOTAL_COEFF_COUNT * 4;
1564         else
1565                 chip->buffer_size += NM_MAX_PLAYBACK_COEF_SIZE + NM_MAX_RECORD_COEF_SIZE;
1566
1567         if (buffer_top >= chip->buffer_size && buffer_top < chip->buffer_end)
1568                 chip->buffer_end = buffer_top;
1569         else {
1570                 /* get buffer end pointer from signature */
1571                 if ((err = snd_nm256_peek_for_sig(chip)) < 0)
1572                         goto __error;
1573         }
1574
1575         chip->buffer_start = chip->buffer_end - chip->buffer_size;
1576         chip->buffer_addr += chip->buffer_start;
1577
1578         dev_info(card->dev, "Mapping port 1 from 0x%x - 0x%x\n",
1579                chip->buffer_start, chip->buffer_end);
1580
1581         chip->res_buffer = request_mem_region(chip->buffer_addr,
1582                                               chip->buffer_size,
1583                                               card->driver);
1584         if (chip->res_buffer == NULL) {
1585                 dev_err(card->dev, "buffer 0x%lx (size 0x%x) busy\n",
1586                            chip->buffer_addr, chip->buffer_size);
1587                 err = -EBUSY;
1588                 goto __error;
1589         }
1590         chip->buffer = ioremap_nocache(chip->buffer_addr, chip->buffer_size);
1591         if (chip->buffer == NULL) {
1592                 err = -ENOMEM;
1593                 dev_err(card->dev, "unable to map ring buffer at %lx\n",
1594                         chip->buffer_addr);
1595                 goto __error;
1596         }
1597
1598         /* set offsets */
1599         addr = chip->buffer_start;
1600         chip->streams[SNDRV_PCM_STREAM_PLAYBACK].buf = addr;
1601         addr += chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize;
1602         chip->streams[SNDRV_PCM_STREAM_CAPTURE].buf = addr;
1603         addr += chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
1604         if (chip->use_cache) {
1605                 chip->all_coeff_buf = addr;
1606         } else {
1607                 chip->coeff_buf[SNDRV_PCM_STREAM_PLAYBACK] = addr;
1608                 addr += NM_MAX_PLAYBACK_COEF_SIZE;
1609                 chip->coeff_buf[SNDRV_PCM_STREAM_CAPTURE] = addr;
1610         }
1611
1612         /* Fixed setting. */
1613         chip->mixer_base = NM_MIXER_OFFSET;
1614
1615         chip->coeffs_current = 0;
1616
1617         snd_nm256_init_chip(chip);
1618
1619         // pci_set_master(pci); /* needed? */
1620
1621         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0)
1622                 goto __error;
1623
1624         *chip_ret = chip;
1625         return 0;
1626
1627 __error:
1628         snd_nm256_free(chip);
1629         return err;
1630 }
1631
1632
1633 enum { NM_BLACKLISTED, NM_RESET_WORKAROUND, NM_RESET_WORKAROUND_2 };
1634
1635 static struct snd_pci_quirk nm256_quirks[] = {
1636         /* HP omnibook 4150 has cs4232 codec internally */
1637         SND_PCI_QUIRK(0x103c, 0x0007, "HP omnibook 4150", NM_BLACKLISTED),
1638         /* Reset workarounds to avoid lock-ups */
1639         SND_PCI_QUIRK(0x104d, 0x8041, "Sony PCG-F305", NM_RESET_WORKAROUND),
1640         SND_PCI_QUIRK(0x1028, 0x0080, "Dell Latitude LS", NM_RESET_WORKAROUND),
1641         SND_PCI_QUIRK(0x1028, 0x0091, "Dell Latitude CSx", NM_RESET_WORKAROUND_2),
1642         { } /* terminator */
1643 };
1644
1645
1646 static int snd_nm256_probe(struct pci_dev *pci,
1647                            const struct pci_device_id *pci_id)
1648 {
1649         struct snd_card *card;
1650         struct nm256 *chip;
1651         int err;
1652         const struct snd_pci_quirk *q;
1653
1654         q = snd_pci_quirk_lookup(pci, nm256_quirks);
1655         if (q) {
1656                 dev_dbg(&pci->dev, "Enabled quirk for %s.\n",
1657                             snd_pci_quirk_name(q));
1658                 switch (q->value) {
1659                 case NM_BLACKLISTED:
1660                         dev_info(&pci->dev,
1661                                  "The device is blacklisted. Loading stopped\n");
1662                         return -ENODEV;
1663                 case NM_RESET_WORKAROUND_2:
1664                         reset_workaround_2 = 1;
1665                         /* Fall-through */
1666                 case NM_RESET_WORKAROUND:
1667                         reset_workaround = 1;
1668                         break;
1669                 }
1670         }
1671
1672         err = snd_card_new(&pci->dev, index, id, THIS_MODULE, 0, &card);
1673         if (err < 0)
1674                 return err;
1675
1676         switch (pci->device) {
1677         case PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO:
1678                 strcpy(card->driver, "NM256AV");
1679                 break;
1680         case PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO:
1681                 strcpy(card->driver, "NM256ZX");
1682                 break;
1683         case PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO:
1684                 strcpy(card->driver, "NM256XL+");
1685                 break;
1686         default:
1687                 dev_err(&pci->dev, "invalid device id 0x%x\n", pci->device);
1688                 snd_card_free(card);
1689                 return -EINVAL;
1690         }
1691
1692         if (vaio_hack)
1693                 buffer_top = 0x25a800;  /* this avoids conflicts with XFree86 server */
1694
1695         if (playback_bufsize < 4)
1696                 playback_bufsize = 4;
1697         if (playback_bufsize > 128)
1698                 playback_bufsize = 128;
1699         if (capture_bufsize < 4)
1700                 capture_bufsize = 4;
1701         if (capture_bufsize > 128)
1702                 capture_bufsize = 128;
1703         if ((err = snd_nm256_create(card, pci, &chip)) < 0) {
1704                 snd_card_free(card);
1705                 return err;
1706         }
1707         card->private_data = chip;
1708
1709         if (reset_workaround) {
1710                 dev_dbg(&pci->dev, "reset_workaround activated\n");
1711                 chip->reset_workaround = 1;
1712         }
1713
1714         if (reset_workaround_2) {
1715                 dev_dbg(&pci->dev, "reset_workaround_2 activated\n");
1716                 chip->reset_workaround_2 = 1;
1717         }
1718
1719         if ((err = snd_nm256_pcm(chip, 0)) < 0 ||
1720             (err = snd_nm256_mixer(chip)) < 0) {
1721                 snd_card_free(card);
1722                 return err;
1723         }
1724
1725         sprintf(card->shortname, "NeoMagic %s", card->driver);
1726         sprintf(card->longname, "%s at 0x%lx & 0x%lx, irq %d",
1727                 card->shortname,
1728                 chip->buffer_addr, chip->cport_addr, chip->irq);
1729
1730         if ((err = snd_card_register(card)) < 0) {
1731                 snd_card_free(card);
1732                 return err;
1733         }
1734
1735         pci_set_drvdata(pci, card);
1736         return 0;
1737 }
1738
1739 static void snd_nm256_remove(struct pci_dev *pci)
1740 {
1741         snd_card_free(pci_get_drvdata(pci));
1742 }
1743
1744
1745 static struct pci_driver nm256_driver = {
1746         .name = KBUILD_MODNAME,
1747         .id_table = snd_nm256_ids,
1748         .probe = snd_nm256_probe,
1749         .remove = snd_nm256_remove,
1750         .driver = {
1751                 .pm = NM256_PM_OPS,
1752         },
1753 };
1754
1755 module_pci_driver(nm256_driver);