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 <sound/driver.h>
  28 #include <asm/io.h>
  29 #include <linux/delay.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/init.h>
  32 #include <linux/pci.h>
  33 #include <linux/slab.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/mutex.h>
  36
  37 #include <sound/core.h>
  38 #include <sound/info.h>
  39 #include <sound/control.h>
  40 #include <sound/pcm.h>
  41 #include <sound/ac97_codec.h>
  42 #include <sound/initval.h>
  43
  44 #define CARD_NAME "NeoMagic 256AV/ZX"
  45 #define DRIVER_NAME "NM256"
  46
  47 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
  48 MODULE_DESCRIPTION("NeoMagic NM256AV/ZX");
  49 MODULE_LICENSE("GPL");
  50 MODULE_SUPPORTED_DEVICE("{{NeoMagic,NM256AV},"
  51                 "{NeoMagic,NM256ZX}}");
  52
  53 /*
  54  * some compile conditions.
  55  */
  56
  57 static int index = SNDRV_DEFAULT_IDX1;  /* Index */
  58 static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */
  59 static int playback_bufsize = 16;
  60 static int capture_bufsize = 16;
  61 static int force_ac97;                  /* disabled as default */
  62 static int buffer_top;                  /* not specified */
  63 static int use_cache;                   /* disabled */
  64 static int vaio_hack;                   /* disabled */
  65 static int reset_workaround;
  66 static int reset_workaround_2;
  67
  68 module_param(index, int, 0444);
  69 MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
  70 module_param(id, charp, 0444);
  71 MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
  72 module_param(playback_bufsize, int, 0444);
  73 MODULE_PARM_DESC(playback_bufsize, "DAC frame size in kB for " CARD_NAME " soundcard.");
  74 module_param(capture_bufsize, int, 0444);
  75 MODULE_PARM_DESC(capture_bufsize, "ADC frame size in kB for " CARD_NAME " soundcard.");
  76 module_param(force_ac97, bool, 0444);
  77 MODULE_PARM_DESC(force_ac97, "Force to use AC97 codec for " CARD_NAME " soundcard.");
  78 module_param(buffer_top, int, 0444);
  79 MODULE_PARM_DESC(buffer_top, "Set the top address of audio buffer for " CARD_NAME " soundcard.");
  80 module_param(use_cache, bool, 0444);
  81 MODULE_PARM_DESC(use_cache, "Enable the cache for coefficient table access.");
  82 module_param(vaio_hack, bool, 0444);
  83 MODULE_PARM_DESC(vaio_hack, "Enable workaround for Sony VAIO notebooks.");
  84 module_param(reset_workaround, bool, 0444);
  85 MODULE_PARM_DESC(reset_workaround, "Enable AC97 RESET workaround for some laptops.");
  86 module_param(reset_workaround_2, bool, 0444);
  87 MODULE_PARM_DESC(reset_workaround_2, "Enable extended AC97 RESET workaround for some other laptops.");
  88
  89 /* just for backward compatibility */
  90 static int enable;
  91 module_param(enable, bool, 0444);
  92
  93
  94
  95 /*
  96  * hw definitions
  97  */
  98
  99 /* The BIOS signature. */
 100 #define NM_SIGNATURE 0x4e4d0000
 101 /* Signature mask. */
 102 #define NM_SIG_MASK 0xffff0000
 103
 104 /* Size of the second memory area. */
 105 #define NM_PORT2_SIZE 4096
 106
 107 /* The base offset of the mixer in the second memory area. */
 108 #define NM_MIXER_OFFSET 0x600
 109
 110 /* The maximum size of a coefficient entry. */
 111 #define NM_MAX_PLAYBACK_COEF_SIZE       0x5000
 112 #define NM_MAX_RECORD_COEF_SIZE         0x1260
 113
 114 /* The interrupt register. */
 115 #define NM_INT_REG 0xa04
 116 /* And its bits. */
 117 #define NM_PLAYBACK_INT 0x40
 118 #define NM_RECORD_INT 0x100
 119 #define NM_MISC_INT_1 0x4000
 120 #define NM_MISC_INT_2 0x1
 121 #define NM_ACK_INT(chip, X) snd_nm256_writew(chip, NM_INT_REG, (X) << 1)
 122
 123 /* The AV's "mixer ready" status bit and location. */
 124 #define NM_MIXER_STATUS_OFFSET 0xa04
 125 #define NM_MIXER_READY_MASK 0x0800
 126 #define NM_MIXER_PRESENCE 0xa06
 127 #define NM_PRESENCE_MASK 0x0050
 128 #define NM_PRESENCE_VALUE 0x0040
 129
 130 /*
 131  * For the ZX.  It uses the same interrupt register, but it holds 32
 132  * bits instead of 16.
 133  */
 134 #define NM2_PLAYBACK_INT 0x10000
 135 #define NM2_RECORD_INT 0x80000
 136 #define NM2_MISC_INT_1 0x8
 137 #define NM2_MISC_INT_2 0x2
 138 #define NM2_ACK_INT(chip, X) snd_nm256_writel(chip, NM_INT_REG, (X))
 139
 140 /* The ZX's "mixer ready" status bit and location. */
 141 #define NM2_MIXER_STATUS_OFFSET 0xa06
 142 #define NM2_MIXER_READY_MASK 0x0800
 143
 144 /* The playback registers start from here. */
 145 #define NM_PLAYBACK_REG_OFFSET 0x0
 146 /* The record registers start from here. */
 147 #define NM_RECORD_REG_OFFSET 0x200
 148
 149 /* The rate register is located 2 bytes from the start of the register area. */
 150 #define NM_RATE_REG_OFFSET 2
 151
 152 /* Mono/stereo flag, number of bits on playback, and rate mask. */
 153 #define NM_RATE_STEREO 1
 154 #define NM_RATE_BITS_16 2
 155 #define NM_RATE_MASK 0xf0
 156
 157 /* Playback enable register. */
 158 #define NM_PLAYBACK_ENABLE_REG (NM_PLAYBACK_REG_OFFSET + 0x1)
 159 #define NM_PLAYBACK_ENABLE_FLAG 1
 160 #define NM_PLAYBACK_ONESHOT 2
 161 #define NM_PLAYBACK_FREERUN 4
 162
 163 /* Mutes the audio output. */
 164 #define NM_AUDIO_MUTE_REG (NM_PLAYBACK_REG_OFFSET + 0x18)
 165 #define NM_AUDIO_MUTE_LEFT 0x8000
 166 #define NM_AUDIO_MUTE_RIGHT 0x0080
 167
 168 /* Recording enable register. */
 169 #define NM_RECORD_ENABLE_REG (NM_RECORD_REG_OFFSET + 0)
 170 #define NM_RECORD_ENABLE_FLAG 1
 171 #define NM_RECORD_FREERUN 2
 172
 173 /* coefficient buffer pointer */
 174 #define NM_COEFF_START_OFFSET   0x1c
 175 #define NM_COEFF_END_OFFSET     0x20
 176
 177 /* DMA buffer offsets */
 178 #define NM_RBUFFER_START (NM_RECORD_REG_OFFSET + 0x4)
 179 #define NM_RBUFFER_END   (NM_RECORD_REG_OFFSET + 0x10)
 180 #define NM_RBUFFER_WMARK (NM_RECORD_REG_OFFSET + 0xc)
 181 #define NM_RBUFFER_CURRP (NM_RECORD_REG_OFFSET + 0x8)
 182
 183 #define NM_PBUFFER_START (NM_PLAYBACK_REG_OFFSET + 0x4)
 184 #define NM_PBUFFER_END   (NM_PLAYBACK_REG_OFFSET + 0x14)
 185 #define NM_PBUFFER_WMARK (NM_PLAYBACK_REG_OFFSET + 0xc)
 186 #define NM_PBUFFER_CURRP (NM_PLAYBACK_REG_OFFSET + 0x8)
 187
 188 struct nm256_stream {
 189
 190         struct nm256 *chip;
 191         struct snd_pcm_substream *substream;
 192         int running;
 193         int suspended;
 194
 195         u32 buf;        /* offset from chip->buffer */
 196         int bufsize;    /* buffer size in bytes */
 197         void __iomem *bufptr;           /* mapped pointer */
 198         unsigned long bufptr_addr;      /* physical address of the mapped pointer */
 199
 200         int dma_size;           /* buffer size of the substream in bytes */
 201         int period_size;        /* period size in bytes */
 202         int periods;            /* # of periods */
 203         int shift;              /* bit shifts */
 204         int cur_period;         /* current period # */
 205
 206 };
 207
 208 struct nm256 {
 209
 210         struct snd_card *card;
 211
 212         void __iomem *cport;            /* control port */
 213         struct resource *res_cport;     /* its resource */
 214         unsigned long cport_addr;       /* physical address */
 215
 216         void __iomem *buffer;           /* buffer */
 217         struct resource *res_buffer;    /* its resource */
 218         unsigned long buffer_addr;      /* buffer phyiscal address */
 219
 220         u32 buffer_start;               /* start offset from pci resource 0 */
 221         u32 buffer_end;                 /* end offset */
 222         u32 buffer_size;                /* total buffer size */
 223
 224         u32 all_coeff_buf;              /* coefficient buffer */
 225         u32 coeff_buf[2];               /* coefficient buffer for each stream */
 226
 227         unsigned int coeffs_current: 1; /* coeff. table is loaded? */
 228         unsigned int use_cache: 1;      /* use one big coef. table */
 229         unsigned int reset_workaround: 1; /* Workaround for some laptops to avoid freeze */
 230         unsigned int reset_workaround_2: 1; /* Extended workaround for some other laptops to avoid freeze */
 231         unsigned int in_resume: 1;
 232
 233         int mixer_base;                 /* register offset of ac97 mixer */
 234         int mixer_status_offset;        /* offset of mixer status reg. */
 235         int mixer_status_mask;          /* bit mask to test the mixer status */
 236
 237         int irq;
 238         int irq_acks;
 239         irq_handler_t interrupt;
 240         int badintrcount;               /* counter to check bogus interrupts */
 241         struct mutex irq_mutex;
 242
 243         struct nm256_stream streams[2];
 244
 245         struct snd_ac97 *ac97;
 246         unsigned short *ac97_regs; /* register caches, only for valid regs */
 247
 248         struct snd_pcm *pcm;
 249
 250         struct pci_dev *pci;
 251
 252         spinlock_t reg_lock;
 253
 254 };
 255
 256
 257 /*
 258  * include coefficient table
 259  */
 260 #include "nm256_coef.c"
 261
 262
 263 /*
 264  * PCI ids
 265  */
 266 static struct pci_device_id snd_nm256_ids[] = {
 267         {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 268         {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 269         {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 270         {0,},
 271 };
 272
 273 MODULE_DEVICE_TABLE(pci, snd_nm256_ids);
 274
 275
 276 /*
 277  * lowlvel stuffs
 278  */
 279
 280 static inline u8
 281 snd_nm256_readb(struct nm256 *chip, int offset)
 282 {
 283         return readb(chip->cport + offset);
 284 }
 285
 286 static inline u16
 287 snd_nm256_readw(struct nm256 *chip, int offset)
 288 {
 289         return readw(chip->cport + offset);
 290 }
 291
 292 static inline u32
 293 snd_nm256_readl(struct nm256 *chip, int offset)
 294 {
 295         return readl(chip->cport + offset);
 296 }
 297
 298 static inline void
 299 snd_nm256_writeb(struct nm256 *chip, int offset, u8 val)
 300 {
 301         writeb(val, chip->cport + offset);
 302 }
 303
 304 static inline void
 305 snd_nm256_writew(struct nm256 *chip, int offset, u16 val)
 306 {
 307         writew(val, chip->cport + offset);
 308 }
 309
 310 static inline void
 311 snd_nm256_writel(struct nm256 *chip, int offset, u32 val)
 312 {
 313         writel(val, chip->cport + offset);
 314 }
 315
 316 static inline void
 317 snd_nm256_write_buffer(struct nm256 *chip, void *src, int offset, int size)
 318 {
 319         offset -= chip->buffer_start;
 320 #ifdef CONFIG_SND_DEBUG
 321         if (offset < 0 || offset >= chip->buffer_size) {
 322                 snd_printk(KERN_ERR "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                 snd_printd("NM256: Engine was enabled while loading coefficients!\n");
 371                 return;
 372         }
 373
 374         /* The recording engine uses coefficient values 8-15.  */
 375         number &= 7;
 376         if (stream == SNDRV_PCM_STREAM_CAPTURE)
 377                 number += 8;
 378
 379         if (! chip->use_cache) {
 380                 snd_nm256_load_one_coefficient(chip, stream, addr, number);
 381                 return;
 382         }
 383         if (! chip->coeffs_current) {
 384                 snd_nm256_write_buffer(chip, coefficients, chip->all_coeff_buf,
 385                                        NM_TOTAL_COEFF_COUNT * 4);
 386                 chip->coeffs_current = 1;
 387         } else {
 388                 u32 base = chip->all_coeff_buf;
 389                 u32 offset = snd_nm256_get_start_offset(number);
 390                 u32 end_offset = offset + coefficient_sizes[number];
 391                 snd_nm256_writel(chip, addr, base + offset);
 392                 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 393                         end_offset--;
 394                 snd_nm256_writel(chip, addr + 4, base + end_offset);
 395         }
 396 }
 397
 398
 399 /* The actual rates supported by the card. */
 400 static unsigned int samplerates[8] = {
 401         8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000,
 402 };
 403 static struct snd_pcm_hw_constraint_list constraints_rates = {
 404         .count = ARRAY_SIZE(samplerates),
 405         .list = samplerates,
 406         .mask = 0,
 407 };
 408
 409 /*
 410  * return the index of the target rate
 411  */
 412 static int
 413 snd_nm256_fixed_rate(unsigned int rate)
 414 {
 415         unsigned int i;
 416         for (i = 0; i < ARRAY_SIZE(samplerates); i++) {
 417                 if (rate == samplerates[i])
 418                         return i;
 419         }
 420         snd_BUG();
 421         return 0;
 422 }
 423
 424 /*
 425  * set sample rate and format
 426  */
 427 static void
 428 snd_nm256_set_format(struct nm256 *chip, struct nm256_stream *s,
 429                      struct snd_pcm_substream *substream)
 430 {
 431         struct snd_pcm_runtime *runtime = substream->runtime;
 432         int rate_index = snd_nm256_fixed_rate(runtime->rate);
 433         unsigned char ratebits = (rate_index << 4) & NM_RATE_MASK;
 434
 435         s->shift = 0;
 436         if (snd_pcm_format_width(runtime->format) == 16) {
 437                 ratebits |= NM_RATE_BITS_16;
 438                 s->shift++;
 439         }
 440         if (runtime->channels > 1) {
 441                 ratebits |= NM_RATE_STEREO;
 442                 s->shift++;
 443         }
 444
 445         runtime->rate = samplerates[rate_index];
 446
 447         switch (substream->stream) {
 448         case SNDRV_PCM_STREAM_PLAYBACK:
 449                 snd_nm256_load_coefficient(chip, 0, rate_index); /* 0 = playback */
 450                 snd_nm256_writeb(chip,
 451                                  NM_PLAYBACK_REG_OFFSET + NM_RATE_REG_OFFSET,
 452                                  ratebits);
 453                 break;
 454         case SNDRV_PCM_STREAM_CAPTURE:
 455                 snd_nm256_load_coefficient(chip, 1, rate_index); /* 1 = record */
 456                 snd_nm256_writeb(chip,
 457                                  NM_RECORD_REG_OFFSET + NM_RATE_REG_OFFSET,
 458                                  ratebits);
 459                 break;
 460         }
 461 }
 462
 463 /* acquire interrupt */
 464 static int snd_nm256_acquire_irq(struct nm256 *chip)
 465 {
 466         mutex_lock(&chip->irq_mutex);
 467         if (chip->irq < 0) {
 468                 if (request_irq(chip->pci->irq, chip->interrupt, IRQF_DISABLED|IRQF_SHARED,
 469                                 chip->card->driver, chip)) {
 470                         snd_printk(KERN_ERR "unable to grab IRQ %d\n", chip->pci->irq);
 471                         mutex_unlock(&chip->irq_mutex);
 472                         return -EBUSY;
 473                 }
 474                 chip->irq = chip->pci->irq;
 475         }
 476         chip->irq_acks++;
 477         mutex_unlock(&chip->irq_mutex);
 478         return 0;
 479 }
 480
 481 /* release interrupt */
 482 static void snd_nm256_release_irq(struct nm256 *chip)
 483 {
 484         mutex_lock(&chip->irq_mutex);
 485         if (chip->irq_acks > 0)
 486                 chip->irq_acks--;
 487         if (chip->irq_acks == 0 && chip->irq >= 0) {
 488                 free_irq(chip->irq, chip);
 489                 chip->irq = -1;
 490         }
 491         mutex_unlock(&chip->irq_mutex);
 492 }
 493
 494 /*
 495  * start / stop
 496  */
 497
 498 /* update the watermark (current period) */
 499 static void snd_nm256_pcm_mark(struct nm256 *chip, struct nm256_stream *s, int reg)
 500 {
 501         s->cur_period++;
 502         s->cur_period %= s->periods;
 503         snd_nm256_writel(chip, reg, s->buf + s->cur_period * s->period_size);
 504 }
 505
 506 #define snd_nm256_playback_mark(chip, s) snd_nm256_pcm_mark(chip, s, NM_PBUFFER_WMARK)
 507 #define snd_nm256_capture_mark(chip, s)  snd_nm256_pcm_mark(chip, s, NM_RBUFFER_WMARK)
 508
 509 static void
 510 snd_nm256_playback_start(struct nm256 *chip, struct nm256_stream *s,
 511                          struct snd_pcm_substream *substream)
 512 {
 513         /* program buffer pointers */
 514         snd_nm256_writel(chip, NM_PBUFFER_START, s->buf);
 515         snd_nm256_writel(chip, NM_PBUFFER_END, s->buf + s->dma_size - (1 << s->shift));
 516         snd_nm256_writel(chip, NM_PBUFFER_CURRP, s->buf);
 517         snd_nm256_playback_mark(chip, s);
 518
 519         /* Enable playback engine and interrupts. */
 520         snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG,
 521                          NM_PLAYBACK_ENABLE_FLAG | NM_PLAYBACK_FREERUN);
 522         /* Enable both channels. */
 523         snd_nm256_writew(chip, NM_AUDIO_MUTE_REG, 0x0);
 524 }
 525
 526 static void
 527 snd_nm256_capture_start(struct nm256 *chip, struct nm256_stream *s,
 528                         struct snd_pcm_substream *substream)
 529 {
 530         /* program buffer pointers */
 531         snd_nm256_writel(chip, NM_RBUFFER_START, s->buf);
 532         snd_nm256_writel(chip, NM_RBUFFER_END, s->buf + s->dma_size);
 533         snd_nm256_writel(chip, NM_RBUFFER_CURRP, s->buf);
 534         snd_nm256_capture_mark(chip, s);
 535
 536         /* Enable playback engine and interrupts. */
 537         snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG,
 538                          NM_RECORD_ENABLE_FLAG | NM_RECORD_FREERUN);
 539 }
 540
 541 /* Stop the play engine. */
 542 static void
 543 snd_nm256_playback_stop(struct nm256 *chip)
 544 {
 545         /* Shut off sound from both channels. */
 546         snd_nm256_writew(chip, NM_AUDIO_MUTE_REG,
 547                          NM_AUDIO_MUTE_LEFT | NM_AUDIO_MUTE_RIGHT);
 548         /* Disable play engine. */
 549         snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG, 0);
 550 }
 551
 552 static void
 553 snd_nm256_capture_stop(struct nm256 *chip)
 554 {
 555         /* Disable recording engine. */
 556         snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG, 0);
 557 }
 558
 559 static int
 560 snd_nm256_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 561 {
 562         struct nm256 *chip = snd_pcm_substream_chip(substream);
 563         struct nm256_stream *s = substream->runtime->private_data;
 564         int err = 0;
 565
 566         snd_assert(s != NULL, return -ENXIO);
 567
 568         spin_lock(&chip->reg_lock);
 569         switch (cmd) {
 570         case SNDRV_PCM_TRIGGER_RESUME:
 571                 s->suspended = 0;
 572                 /* fallthru */
 573         case SNDRV_PCM_TRIGGER_START:
 574                 if (! s->running) {
 575                         snd_nm256_playback_start(chip, s, substream);
 576                         s->running = 1;
 577                 }
 578                 break;
 579         case SNDRV_PCM_TRIGGER_SUSPEND:
 580                 s->suspended = 1;
 581                 /* fallthru */
 582         case SNDRV_PCM_TRIGGER_STOP:
 583                 if (s->running) {
 584                         snd_nm256_playback_stop(chip);
 585                         s->running = 0;
 586                 }
 587                 break;
 588         default:
 589                 err = -EINVAL;
 590                 break;
 591         }
 592         spin_unlock(&chip->reg_lock);
 593         return err;
 594 }
 595
 596 static int
 597 snd_nm256_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 598 {
 599         struct nm256 *chip = snd_pcm_substream_chip(substream);
 600         struct nm256_stream *s = substream->runtime->private_data;
 601         int err = 0;
 602
 603         snd_assert(s != NULL, return -ENXIO);
 604
 605         spin_lock(&chip->reg_lock);
 606         switch (cmd) {
 607         case SNDRV_PCM_TRIGGER_START:
 608         case SNDRV_PCM_TRIGGER_RESUME:
 609                 if (! s->running) {
 610                         snd_nm256_capture_start(chip, s, substream);
 611                         s->running = 1;
 612                 }
 613                 break;
 614         case SNDRV_PCM_TRIGGER_STOP:
 615         case SNDRV_PCM_TRIGGER_SUSPEND:
 616                 if (s->running) {
 617                         snd_nm256_capture_stop(chip);
 618                         s->running = 0;
 619                 }
 620                 break;
 621         default:
 622                 err = -EINVAL;
 623                 break;
 624         }
 625         spin_unlock(&chip->reg_lock);
 626         return err;
 627 }
 628
 629
 630 /*
 631  * prepare playback/capture channel
 632  */
 633 static int snd_nm256_pcm_prepare(struct snd_pcm_substream *substream)
 634 {
 635         struct nm256 *chip = snd_pcm_substream_chip(substream);
 636         struct snd_pcm_runtime *runtime = substream->runtime;
 637         struct nm256_stream *s = runtime->private_data;
 638
 639         snd_assert(s, return -ENXIO);
 640         s->dma_size = frames_to_bytes(runtime, substream->runtime->buffer_size);
 641         s->period_size = frames_to_bytes(runtime, substream->runtime->period_size);
 642         s->periods = substream->runtime->periods;
 643         s->cur_period = 0;
 644
 645         spin_lock_irq(&chip->reg_lock);
 646         s->running = 0;
 647         snd_nm256_set_format(chip, s, substream);
 648         spin_unlock_irq(&chip->reg_lock);
 649
 650         return 0;
 651 }
 652
 653
 654 /*
 655  * get the current pointer
 656  */
 657 static snd_pcm_uframes_t
 658 snd_nm256_playback_pointer(struct snd_pcm_substream *substream)
 659 {
 660         struct nm256 *chip = snd_pcm_substream_chip(substream);
 661         struct nm256_stream *s = substream->runtime->private_data;
 662         unsigned long curp;
 663
 664         snd_assert(s, return 0);
 665         curp = snd_nm256_readl(chip, NM_PBUFFER_CURRP) - (unsigned long)s->buf;
 666         curp %= s->dma_size;
 667         return bytes_to_frames(substream->runtime, curp);
 668 }
 669
 670 static snd_pcm_uframes_t
 671 snd_nm256_capture_pointer(struct snd_pcm_substream *substream)
 672 {
 673         struct nm256 *chip = snd_pcm_substream_chip(substream);
 674         struct nm256_stream *s = substream->runtime->private_data;
 675         unsigned long curp;
 676
 677         snd_assert(s != NULL, return 0);
 678         curp = snd_nm256_readl(chip, NM_RBUFFER_CURRP) - (unsigned long)s->buf;
 679         curp %= s->dma_size;
 680         return bytes_to_frames(substream->runtime, curp);
 681 }
 682
 683 /* Remapped I/O space can be accessible as pointer on i386 */
 684 /* This might be changed in the future */
 685 #ifndef __i386__
 686 /*
 687  * silence / copy for playback
 688  */
 689 static int
 690 snd_nm256_playback_silence(struct snd_pcm_substream *substream,
 691                            int channel, /* not used (interleaved data) */
 692                            snd_pcm_uframes_t pos,
 693                            snd_pcm_uframes_t count)
 694 {
 695         struct snd_pcm_runtime *runtime = substream->runtime;
 696         struct nm256_stream *s = runtime->private_data;
 697         count = frames_to_bytes(runtime, count);
 698         pos = frames_to_bytes(runtime, pos);
 699         memset_io(s->bufptr + pos, 0, count);
 700         return 0;
 701 }
 702
 703 static int
 704 snd_nm256_playback_copy(struct snd_pcm_substream *substream,
 705                         int channel, /* not used (interleaved data) */
 706                         snd_pcm_uframes_t pos,
 707                         void __user *src,
 708                         snd_pcm_uframes_t count)
 709 {
 710         struct snd_pcm_runtime *runtime = substream->runtime;
 711         struct nm256_stream *s = runtime->private_data;
 712         count = frames_to_bytes(runtime, count);
 713         pos = frames_to_bytes(runtime, pos);
 714         if (copy_from_user_toio(s->bufptr + pos, src, count))
 715                 return -EFAULT;
 716         return 0;
 717 }
 718
 719 /*
 720  * copy to user
 721  */
 722 static int
 723 snd_nm256_capture_copy(struct snd_pcm_substream *substream,
 724                        int channel, /* not used (interleaved data) */
 725                        snd_pcm_uframes_t pos,
 726                        void __user *dst,
 727                        snd_pcm_uframes_t count)
 728 {
 729         struct snd_pcm_runtime *runtime = substream->runtime;
 730         struct nm256_stream *s = runtime->private_data;
 731         count = frames_to_bytes(runtime, count);
 732         pos = frames_to_bytes(runtime, pos);
 733         if (copy_to_user_fromio(dst, s->bufptr + pos, count))
 734                 return -EFAULT;
 735         return 0;
 736 }
 737
 738 #endif /* !__i386__ */
 739
 740
 741 /*
 742  * update playback/capture watermarks
 743  */
 744
 745 /* spinlock held! */
 746 static void
 747 snd_nm256_playback_update(struct nm256 *chip)
 748 {
 749         struct nm256_stream *s;
 750
 751         s = &chip->streams[SNDRV_PCM_STREAM_PLAYBACK];
 752         if (s->running && s->substream) {
 753                 spin_unlock(&chip->reg_lock);
 754                 snd_pcm_period_elapsed(s->substream);
 755                 spin_lock(&chip->reg_lock);
 756                 snd_nm256_playback_mark(chip, s);
 757         }
 758 }
 759
 760 /* spinlock held! */
 761 static void
 762 snd_nm256_capture_update(struct nm256 *chip)
 763 {
 764         struct nm256_stream *s;
 765
 766         s = &chip->streams[SNDRV_PCM_STREAM_CAPTURE];
 767         if (s->running && s->substream) {
 768                 spin_unlock(&chip->reg_lock);
 769                 snd_pcm_period_elapsed(s->substream);
 770                 spin_lock(&chip->reg_lock);
 771                 snd_nm256_capture_mark(chip, s);
 772         }
 773 }
 774
 775 /*
 776  * hardware info
 777  */
 778 static struct snd_pcm_hardware snd_nm256_playback =
 779 {
 780         .info =                 SNDRV_PCM_INFO_MMAP_IOMEM |SNDRV_PCM_INFO_MMAP_VALID |
 781                                 SNDRV_PCM_INFO_INTERLEAVED |
 782                                 /*SNDRV_PCM_INFO_PAUSE |*/
 783                                 SNDRV_PCM_INFO_RESUME,
 784         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
 785         .rates =                SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
 786         .rate_min =             8000,
 787         .rate_max =             48000,
 788         .channels_min =         1,
 789         .channels_max =         2,
 790         .periods_min =          2,
 791         .periods_max =          1024,
 792         .buffer_bytes_max =     128 * 1024,
 793         .period_bytes_min =     256,
 794         .period_bytes_max =     128 * 1024,
 795 };
 796
 797 static struct snd_pcm_hardware snd_nm256_capture =
 798 {
 799         .info =                 SNDRV_PCM_INFO_MMAP_IOMEM | SNDRV_PCM_INFO_MMAP_VALID |
 800                                 SNDRV_PCM_INFO_INTERLEAVED |
 801                                 /*SNDRV_PCM_INFO_PAUSE |*/
 802                                 SNDRV_PCM_INFO_RESUME,
 803         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
 804         .rates =                SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
 805         .rate_min =             8000,
 806         .rate_max =             48000,
 807         .channels_min =         1,
 808         .channels_max =         2,
 809         .periods_min =          2,
 810         .periods_max =          1024,
 811         .buffer_bytes_max =     128 * 1024,
 812         .period_bytes_min =     256,
 813         .period_bytes_max =     128 * 1024,
 814 };
 815
 816
 817 /* set dma transfer size */
 818 static int snd_nm256_pcm_hw_params(struct snd_pcm_substream *substream,
 819                                    struct snd_pcm_hw_params *hw_params)
 820 {
 821         /* area and addr are already set and unchanged */
 822         substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
 823         return 0;
 824 }
 825
 826 /*
 827  * open
 828  */
 829 static void snd_nm256_setup_stream(struct nm256 *chip, struct nm256_stream *s,
 830                                    struct snd_pcm_substream *substream,
 831                                    struct snd_pcm_hardware *hw_ptr)
 832 {
 833         struct snd_pcm_runtime *runtime = substream->runtime;
 834
 835         s->running = 0;
 836         runtime->hw = *hw_ptr;
 837         runtime->hw.buffer_bytes_max = s->bufsize;
 838         runtime->hw.period_bytes_max = s->bufsize / 2;
 839         runtime->dma_area = (void __force *) s->bufptr;
 840         runtime->dma_addr = s->bufptr_addr;
 841         runtime->dma_bytes = s->bufsize;
 842         runtime->private_data = s;
 843         s->substream = substream;
 844
 845         snd_pcm_set_sync(substream);
 846         snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 847                                    &constraints_rates);
 848 }
 849
 850 static int
 851 snd_nm256_playback_open(struct snd_pcm_substream *substream)
 852 {
 853         struct nm256 *chip = snd_pcm_substream_chip(substream);
 854
 855         if (snd_nm256_acquire_irq(chip) < 0)
 856                 return -EBUSY;
 857         snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_PLAYBACK],
 858                                substream, &snd_nm256_playback);
 859         return 0;
 860 }
 861
 862 static int
 863 snd_nm256_capture_open(struct snd_pcm_substream *substream)
 864 {
 865         struct nm256 *chip = snd_pcm_substream_chip(substream);
 866
 867         if (snd_nm256_acquire_irq(chip) < 0)
 868                 return -EBUSY;
 869         snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_CAPTURE],
 870                                substream, &snd_nm256_capture);
 871         return 0;
 872 }
 873
 874 /*
 875  * close - we don't have to do special..
 876  */
 877 static int
 878 snd_nm256_playback_close(struct snd_pcm_substream *substream)
 879 {
 880         struct nm256 *chip = snd_pcm_substream_chip(substream);
 881
 882         snd_nm256_release_irq(chip);
 883         return 0;
 884 }
 885
 886
 887 static int
 888 snd_nm256_capture_close(struct snd_pcm_substream *substream)
 889 {
 890         struct nm256 *chip = snd_pcm_substream_chip(substream);
 891
 892         snd_nm256_release_irq(chip);
 893         return 0;
 894 }
 895
 896 /*
 897  * create a pcm instance
 898  */
 899 static struct snd_pcm_ops snd_nm256_playback_ops = {
 900         .open =         snd_nm256_playback_open,
 901         .close =        snd_nm256_playback_close,
 902         .ioctl =        snd_pcm_lib_ioctl,
 903         .hw_params =    snd_nm256_pcm_hw_params,
 904         .prepare =      snd_nm256_pcm_prepare,
 905         .trigger =      snd_nm256_playback_trigger,
 906         .pointer =      snd_nm256_playback_pointer,
 907 #ifndef __i386__
 908         .copy =         snd_nm256_playback_copy,
 909         .silence =      snd_nm256_playback_silence,
 910 #endif
 911         .mmap =         snd_pcm_lib_mmap_iomem,
 912 };
 913
 914 static struct snd_pcm_ops snd_nm256_capture_ops = {
 915         .open =         snd_nm256_capture_open,
 916         .close =        snd_nm256_capture_close,
 917         .ioctl =        snd_pcm_lib_ioctl,
 918         .hw_params =    snd_nm256_pcm_hw_params,
 919         .prepare =      snd_nm256_pcm_prepare,
 920         .trigger =      snd_nm256_capture_trigger,
 921         .pointer =      snd_nm256_capture_pointer,
 922 #ifndef __i386__
 923         .copy =         snd_nm256_capture_copy,
 924 #endif
 925         .mmap =         snd_pcm_lib_mmap_iomem,
 926 };
 927
 928 static int __devinit
 929 snd_nm256_pcm(struct nm256 *chip, int device)
 930 {
 931         struct snd_pcm *pcm;
 932         int i, err;
 933
 934         for (i = 0; i < 2; i++) {
 935                 struct nm256_stream *s = &chip->streams[i];
 936                 s->bufptr = chip->buffer + (s->buf - chip->buffer_start);
 937                 s->bufptr_addr = chip->buffer_addr + (s->buf - chip->buffer_start);
 938         }
 939
 940         err = snd_pcm_new(chip->card, chip->card->driver, device,
 941                           1, 1, &pcm);
 942         if (err < 0)
 943                 return err;
 944
 945         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_nm256_playback_ops);
 946         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_nm256_capture_ops);
 947
 948         pcm->private_data = chip;
 949         pcm->info_flags = 0;
 950         chip->pcm = pcm;
 951
 952         return 0;
 953 }
 954
 955
 956 /*
 957  * Initialize the hardware.
 958  */
 959 static void
 960 snd_nm256_init_chip(struct nm256 *chip)
 961 {
 962         /* Reset everything. */
 963         snd_nm256_writeb(chip, 0x0, 0x11);
 964         snd_nm256_writew(chip, 0x214, 0);
 965         /* stop sounds.. */
 966         //snd_nm256_playback_stop(chip);
 967         //snd_nm256_capture_stop(chip);
 968 }
 969
 970
 971 static irqreturn_t
 972 snd_nm256_intr_check(struct nm256 *chip)
 973 {
 974         if (chip->badintrcount++ > 1000) {
 975                 /*
 976                  * I'm not sure if the best thing is to stop the card from
 977                  * playing or just release the interrupt (after all, we're in
 978                  * a bad situation, so doing fancy stuff may not be such a good
 979                  * idea).
 980                  *
 981                  * I worry about the card engine continuing to play noise
 982                  * over and over, however--that could become a very
 983                  * obnoxious problem.  And we know that when this usually
 984                  * happens things are fairly safe, it just means the user's
 985                  * inserted a PCMCIA card and someone's spamming us with IRQ 9s.
 986                  */
 987                 if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
 988                         snd_nm256_playback_stop(chip);
 989                 if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
 990                         snd_nm256_capture_stop(chip);
 991                 chip->badintrcount = 0;
 992                 return IRQ_HANDLED;
 993         }
 994         return IRQ_NONE;
 995 }
 996
 997 /*
 998  * Handle a potential interrupt for the device referred to by DEV_ID.
 999  *
1000  * I don't like the cut-n-paste job here either between the two routines,
1001  * but there are sufficient differences between the two interrupt handlers
1002  * that parameterizing it isn't all that great either.  (Could use a macro,
1003  * I suppose...yucky bleah.)
1004  */
1005
1006 static irqreturn_t
1007 snd_nm256_interrupt(int irq, void *dev_id)
1008 {
1009         struct nm256 *chip = dev_id;
1010         u16 status;
1011         u8 cbyte;
1012
1013         status = snd_nm256_readw(chip, NM_INT_REG);
1014
1015         /* Not ours. */
1016         if (status == 0)
1017                 return snd_nm256_intr_check(chip);
1018
1019         chip->badintrcount = 0;
1020
1021         /* Rather boring; check for individual interrupts and process them. */
1022
1023         spin_lock(&chip->reg_lock);
1024         if (status & NM_PLAYBACK_INT) {
1025                 status &= ~NM_PLAYBACK_INT;
1026                 NM_ACK_INT(chip, NM_PLAYBACK_INT);
1027                 snd_nm256_playback_update(chip);
1028         }
1029
1030         if (status & NM_RECORD_INT) {
1031                 status &= ~NM_RECORD_INT;
1032                 NM_ACK_INT(chip, NM_RECORD_INT);
1033                 snd_nm256_capture_update(chip);
1034         }
1035
1036         if (status & NM_MISC_INT_1) {
1037                 status &= ~NM_MISC_INT_1;
1038                 NM_ACK_INT(chip, NM_MISC_INT_1);
1039                 snd_printd("NM256: Got misc interrupt #1\n");
1040                 snd_nm256_writew(chip, NM_INT_REG, 0x8000);
1041                 cbyte = snd_nm256_readb(chip, 0x400);
1042                 snd_nm256_writeb(chip, 0x400, cbyte | 2);
1043         }
1044
1045         if (status & NM_MISC_INT_2) {
1046                 status &= ~NM_MISC_INT_2;
1047                 NM_ACK_INT(chip, NM_MISC_INT_2);
1048                 snd_printd("NM256: Got misc interrupt #2\n");
1049                 cbyte = snd_nm256_readb(chip, 0x400);
1050                 snd_nm256_writeb(chip, 0x400, cbyte & ~2);
1051         }
1052
1053         /* Unknown interrupt. */
1054         if (status) {
1055                 snd_printd("NM256: Fire in the hole! Unknown status 0x%x\n",
1056                            status);
1057                 /* Pray. */
1058                 NM_ACK_INT(chip, status);
1059         }
1060
1061         spin_unlock(&chip->reg_lock);
1062         return IRQ_HANDLED;
1063 }
1064
1065 /*
1066  * Handle a potential interrupt for the device referred to by DEV_ID.
1067  * This handler is for the 256ZX, and is very similar to the non-ZX
1068  * routine.
1069  */
1070
1071 static irqreturn_t
1072 snd_nm256_interrupt_zx(int irq, void *dev_id)
1073 {
1074         struct nm256 *chip = dev_id;
1075         u32 status;
1076         u8 cbyte;
1077
1078         status = snd_nm256_readl(chip, NM_INT_REG);
1079
1080         /* Not ours. */
1081         if (status == 0)
1082                 return snd_nm256_intr_check(chip);
1083
1084         chip->badintrcount = 0;
1085
1086         /* Rather boring; check for individual interrupts and process them. */
1087
1088         spin_lock(&chip->reg_lock);
1089         if (status & NM2_PLAYBACK_INT) {
1090                 status &= ~NM2_PLAYBACK_INT;
1091                 NM2_ACK_INT(chip, NM2_PLAYBACK_INT);
1092                 snd_nm256_playback_update(chip);
1093         }
1094
1095         if (status & NM2_RECORD_INT) {
1096                 status &= ~NM2_RECORD_INT;
1097                 NM2_ACK_INT(chip, NM2_RECORD_INT);
1098                 snd_nm256_capture_update(chip);
1099         }
1100
1101         if (status & NM2_MISC_INT_1) {
1102                 status &= ~NM2_MISC_INT_1;
1103                 NM2_ACK_INT(chip, NM2_MISC_INT_1);
1104                 snd_printd("NM256: Got misc interrupt #1\n");
1105                 cbyte = snd_nm256_readb(chip, 0x400);
1106                 snd_nm256_writeb(chip, 0x400, cbyte | 2);
1107         }
1108
1109         if (status & NM2_MISC_INT_2) {
1110                 status &= ~NM2_MISC_INT_2;
1111                 NM2_ACK_INT(chip, NM2_MISC_INT_2);
1112                 snd_printd("NM256: Got misc interrupt #2\n");
1113                 cbyte = snd_nm256_readb(chip, 0x400);
1114                 snd_nm256_writeb(chip, 0x400, cbyte & ~2);
1115         }
1116
1117         /* Unknown interrupt. */
1118         if (status) {
1119                 snd_printd("NM256: Fire in the hole! Unknown status 0x%x\n",
1120                            status);
1121                 /* Pray. */
1122                 NM2_ACK_INT(chip, status);
1123         }
1124
1125         spin_unlock(&chip->reg_lock);
1126         return IRQ_HANDLED;
1127 }
1128
1129 /*
1130  * AC97 interface
1131  */
1132
1133 /*
1134  * Waits for the mixer to become ready to be written; returns a zero value
1135  * if it timed out.
1136  */
1137 static int
1138 snd_nm256_ac97_ready(struct nm256 *chip)
1139 {
1140         int timeout = 10;
1141         u32 testaddr;
1142         u16 testb;
1143
1144         testaddr = chip->mixer_status_offset;
1145         testb = chip->mixer_status_mask;
1146
1147         /*
1148          * Loop around waiting for the mixer to become ready.
1149          */
1150         while (timeout-- > 0) {
1151                 if ((snd_nm256_readw(chip, testaddr) & testb) == 0)
1152                         return 1;
1153                 udelay(100);
1154         }
1155         return 0;
1156 }
1157
1158 /*
1159  * Initial register values to be written to the AC97 mixer.
1160  * While most of these are identical to the reset values, we do this
1161  * so that we have most of the register contents cached--this avoids
1162  * reading from the mixer directly (which seems to be problematic,
1163  * probably due to ignorance).
1164  */
1165
1166 struct initialValues {
1167         unsigned short reg;
1168         unsigned short value;
1169 };
1170
1171 static struct initialValues nm256_ac97_init_val[] =
1172 {
1173         { AC97_MASTER,          0x8000 },
1174         { AC97_HEADPHONE,       0x8000 },
1175         { AC97_MASTER_MONO,     0x8000 },
1176         { AC97_PC_BEEP,         0x8000 },
1177         { AC97_PHONE,           0x8008 },
1178         { AC97_MIC,             0x8000 },
1179         { AC97_LINE,            0x8808 },
1180         { AC97_CD,              0x8808 },
1181         { AC97_VIDEO,           0x8808 },
1182         { AC97_AUX,             0x8808 },
1183         { AC97_PCM,             0x8808 },
1184         { AC97_REC_SEL,         0x0000 },
1185         { AC97_REC_GAIN,        0x0B0B },
1186         { AC97_GENERAL_PURPOSE, 0x0000 },
1187         { AC97_3D_CONTROL,      0x8000 },
1188         { AC97_VENDOR_ID1,      0x8384 },
1189         { AC97_VENDOR_ID2,      0x7609 },
1190 };
1191
1192 static int nm256_ac97_idx(unsigned short reg)
1193 {
1194         int i;
1195         for (i = 0; i < ARRAY_SIZE(nm256_ac97_init_val); i++)
1196                 if (nm256_ac97_init_val[i].reg == reg)
1197                         return i;
1198         return -1;
1199 }
1200
1201 /*
1202  * some nm256 easily crash when reading from mixer registers
1203  * thus we're treating it as a write-only mixer and cache the
1204  * written values
1205  */
1206 static unsigned short
1207 snd_nm256_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
1208 {
1209         struct nm256 *chip = ac97->private_data;
1210         int idx = nm256_ac97_idx(reg);
1211
1212         if (idx < 0)
1213                 return 0;
1214         return chip->ac97_regs[idx];
1215 }
1216
1217 /*
1218  */
1219 static void
1220 snd_nm256_ac97_write(struct snd_ac97 *ac97,
1221                      unsigned short reg, unsigned short val)
1222 {
1223         struct nm256 *chip = ac97->private_data;
1224         int tries = 2;
1225         int idx = nm256_ac97_idx(reg);
1226         u32 base;
1227
1228         if (idx < 0)
1229                 return;
1230
1231         base = chip->mixer_base;
1232
1233         snd_nm256_ac97_ready(chip);
1234
1235         /* Wait for the write to take, too. */
1236         while (tries-- > 0) {
1237                 snd_nm256_writew(chip, base + reg, val);
1238                 msleep(1);  /* a little delay here seems better.. */
1239                 if (snd_nm256_ac97_ready(chip)) {
1240                         /* successful write: set cache */
1241                         chip->ac97_regs[idx] = val;
1242                         return;
1243                 }
1244         }
1245         snd_printd("nm256: ac97 codec not ready..\n");
1246 }
1247
1248 /* static resolution table */
1249 static struct snd_ac97_res_table nm256_res_table[] = {
1250         { AC97_MASTER, 0x1f1f },
1251         { AC97_HEADPHONE, 0x1f1f },
1252         { AC97_MASTER_MONO, 0x001f },
1253         { AC97_PC_BEEP, 0x001f },
1254         { AC97_PHONE, 0x001f },
1255         { AC97_MIC, 0x001f },
1256         { AC97_LINE, 0x1f1f },
1257         { AC97_CD, 0x1f1f },
1258         { AC97_VIDEO, 0x1f1f },
1259         { AC97_AUX, 0x1f1f },
1260         { AC97_PCM, 0x1f1f },
1261         { AC97_REC_GAIN, 0x0f0f },
1262         { } /* terminator */
1263 };
1264
1265 /* initialize the ac97 into a known state */
1266 static void
1267 snd_nm256_ac97_reset(struct snd_ac97 *ac97)
1268 {
1269         struct nm256 *chip = ac97->private_data;
1270
1271         /* Reset the mixer.  'Tis magic!  */
1272         snd_nm256_writeb(chip, 0x6c0, 1);
1273         if (! chip->reset_workaround) {
1274                 /* Dell latitude LS will lock up by this */
1275                 snd_nm256_writeb(chip, 0x6cc, 0x87);
1276         }
1277         if (! chip->reset_workaround_2) {
1278                 /* Dell latitude CSx will lock up by this */
1279                 snd_nm256_writeb(chip, 0x6cc, 0x80);
1280                 snd_nm256_writeb(chip, 0x6cc, 0x0);
1281         }
1282         if (! chip->in_resume) {
1283                 int i;
1284                 for (i = 0; i < ARRAY_SIZE(nm256_ac97_init_val); i++) {
1285                         /* preload the cache, so as to avoid even a single
1286                          * read of the mixer regs
1287                          */
1288                         snd_nm256_ac97_write(ac97, nm256_ac97_init_val[i].reg,
1289                                              nm256_ac97_init_val[i].value);
1290                 }
1291         }
1292 }
1293
1294 /* create an ac97 mixer interface */
1295 static int __devinit
1296 snd_nm256_mixer(struct nm256 *chip)
1297 {
1298         struct snd_ac97_bus *pbus;
1299         struct snd_ac97_template ac97;
1300         int err;
1301         static struct snd_ac97_bus_ops ops = {
1302                 .reset = snd_nm256_ac97_reset,
1303                 .write = snd_nm256_ac97_write,
1304                 .read = snd_nm256_ac97_read,
1305         };
1306
1307         chip->ac97_regs = kcalloc(sizeof(short),
1308                                   ARRAY_SIZE(nm256_ac97_init_val), GFP_KERNEL);
1309         if (! chip->ac97_regs)
1310                 return -ENOMEM;
1311
1312         if ((err = snd_ac97_bus(chip->card, 0, &ops, NULL, &pbus)) < 0)
1313                 return err;
1314
1315         memset(&ac97, 0, sizeof(ac97));
1316         ac97.scaps = AC97_SCAP_AUDIO; /* we support audio! */
1317         ac97.private_data = chip;
1318         ac97.res_table = nm256_res_table;
1319         pbus->no_vra = 1;
1320         err = snd_ac97_mixer(pbus, &ac97, &chip->ac97);
1321         if (err < 0)
1322                 return err;
1323         if (! (chip->ac97->id & (0xf0000000))) {
1324                 /* looks like an invalid id */
1325                 sprintf(chip->card->mixername, "%s AC97", chip->card->driver);
1326         }
1327         return 0;
1328 }
1329
1330 /*
1331  * See if the signature left by the NM256 BIOS is intact; if so, we use
1332  * the associated address as the end of our audio buffer in the video
1333  * RAM.
1334  */
1335
1336 static int __devinit
1337 snd_nm256_peek_for_sig(struct nm256 *chip)
1338 {
1339         /* The signature is located 1K below the end of video RAM.  */
1340         void __iomem *temp;
1341         /* Default buffer end is 5120 bytes below the top of RAM.  */
1342         unsigned long pointer_found = chip->buffer_end - 0x1400;
1343         u32 sig;
1344
1345         temp = ioremap_nocache(chip->buffer_addr + chip->buffer_end - 0x400, 16);
1346         if (temp == NULL) {
1347                 snd_printk(KERN_ERR "Unable to scan for card signature in video RAM\n");
1348                 return -EBUSY;
1349         }
1350
1351         sig = readl(temp);
1352         if ((sig & NM_SIG_MASK) == NM_SIGNATURE) {
1353                 u32 pointer = readl(temp + 4);
1354
1355                 /*
1356                  * If it's obviously invalid, don't use it
1357                  */
1358                 if (pointer == 0xffffffff ||
1359                     pointer < chip->buffer_size ||
1360                     pointer > chip->buffer_end) {
1361                         snd_printk(KERN_ERR "invalid signature found: 0x%x\n", pointer);
1362                         iounmap(temp);
1363                         return -ENODEV;
1364                 } else {
1365                         pointer_found = pointer;
1366                         printk(KERN_INFO "nm256: found card signature in video RAM: 0x%x\n",
1367                                pointer);
1368                 }
1369         }
1370
1371         iounmap(temp);
1372         chip->buffer_end = pointer_found;
1373
1374         return 0;
1375 }
1376
1377 #ifdef CONFIG_PM
1378 /*
1379  * APM event handler, so the card is properly reinitialized after a power
1380  * event.
1381  */
1382 static int nm256_suspend(struct pci_dev *pci, pm_message_t state)
1383 {
1384         struct snd_card *card = pci_get_drvdata(pci);
1385         struct nm256 *chip = card->private_data;
1386
1387         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1388         snd_pcm_suspend_all(chip->pcm);
1389         snd_ac97_suspend(chip->ac97);
1390         chip->coeffs_current = 0;
1391         pci_disable_device(pci);
1392         pci_save_state(pci);
1393         return 0;
1394 }
1395
1396 static int nm256_resume(struct pci_dev *pci)
1397 {
1398         struct snd_card *card = pci_get_drvdata(pci);
1399         struct nm256 *chip = card->private_data;
1400         int i;
1401
1402         /* Perform a full reset on the hardware */
1403         chip->in_resume = 1;
1404         pci_restore_state(pci);
1405         pci_enable_device(pci);
1406         snd_nm256_init_chip(chip);
1407
1408         /* restore ac97 */
1409         snd_ac97_resume(chip->ac97);
1410
1411         for (i = 0; i < 2; i++) {
1412                 struct nm256_stream *s = &chip->streams[i];
1413                 if (s->substream && s->suspended) {
1414                         spin_lock_irq(&chip->reg_lock);
1415                         snd_nm256_set_format(chip, s, s->substream);
1416                         spin_unlock_irq(&chip->reg_lock);
1417                 }
1418         }
1419
1420         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1421         chip->in_resume = 0;
1422         return 0;
1423 }
1424 #endif /* CONFIG_PM */
1425
1426 static int snd_nm256_free(struct nm256 *chip)
1427 {
1428         if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
1429                 snd_nm256_playback_stop(chip);
1430         if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
1431                 snd_nm256_capture_stop(chip);
1432
1433         if (chip->irq >= 0)
1434                 synchronize_irq(chip->irq);
1435
1436         if (chip->cport)
1437                 iounmap(chip->cport);
1438         if (chip->buffer)
1439                 iounmap(chip->buffer);
1440         release_and_free_resource(chip->res_cport);
1441         release_and_free_resource(chip->res_buffer);
1442         if (chip->irq >= 0)
1443                 free_irq(chip->irq, chip);
1444
1445         pci_disable_device(chip->pci);
1446         kfree(chip->ac97_regs);
1447         kfree(chip);
1448         return 0;
1449 }
1450
1451 static int snd_nm256_dev_free(struct snd_device *device)
1452 {
1453         struct nm256 *chip = device->device_data;
1454         return snd_nm256_free(chip);
1455 }
1456
1457 static int __devinit
1458 snd_nm256_create(struct snd_card *card, struct pci_dev *pci,
1459                  struct nm256 **chip_ret)
1460 {
1461         struct nm256 *chip;
1462         int err, pval;
1463         static struct snd_device_ops ops = {
1464                 .dev_free =     snd_nm256_dev_free,
1465         };
1466         u32 addr;
1467
1468         *chip_ret = NULL;
1469
1470         if ((err = pci_enable_device(pci)) < 0)
1471                 return err;
1472
1473         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1474         if (chip == NULL) {
1475                 pci_disable_device(pci);
1476                 return -ENOMEM;
1477         }
1478
1479         chip->card = card;
1480         chip->pci = pci;
1481         chip->use_cache = use_cache;
1482         spin_lock_init(&chip->reg_lock);
1483         chip->irq = -1;
1484         mutex_init(&chip->irq_mutex);
1485
1486         /* store buffer sizes in bytes */
1487         chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize = playback_bufsize * 1024;
1488         chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize = capture_bufsize * 1024;
1489
1490         /*
1491          * The NM256 has two memory ports.  The first port is nothing
1492          * more than a chunk of video RAM, which is used as the I/O ring
1493          * buffer.  The second port has the actual juicy stuff (like the
1494          * mixer and the playback engine control registers).
1495          */
1496
1497         chip->buffer_addr = pci_resource_start(pci, 0);
1498         chip->cport_addr = pci_resource_start(pci, 1);
1499
1500         /* Init the memory port info.  */
1501         /* remap control port (#2) */
1502         chip->res_cport = request_mem_region(chip->cport_addr, NM_PORT2_SIZE,
1503                                              card->driver);
1504         if (chip->res_cport == NULL) {
1505                 snd_printk(KERN_ERR "memory region 0x%lx (size 0x%x) busy\n",
1506                            chip->cport_addr, NM_PORT2_SIZE);
1507                 err = -EBUSY;
1508                 goto __error;
1509         }
1510         chip->cport = ioremap_nocache(chip->cport_addr, NM_PORT2_SIZE);
1511         if (chip->cport == NULL) {
1512                 snd_printk(KERN_ERR "unable to map control port %lx\n", chip->cport_addr);
1513                 err = -ENOMEM;
1514                 goto __error;
1515         }
1516
1517         if (!strcmp(card->driver, "NM256AV")) {
1518                 /* Ok, try to see if this is a non-AC97 version of the hardware. */
1519                 pval = snd_nm256_readw(chip, NM_MIXER_PRESENCE);
1520                 if ((pval & NM_PRESENCE_MASK) != NM_PRESENCE_VALUE) {
1521                         if (! force_ac97) {
1522                                 printk(KERN_ERR "nm256: no ac97 is found!\n");
1523                                 printk(KERN_ERR "  force the driver to load by "
1524                                        "passing in the module parameter\n");
1525                                 printk(KERN_ERR "    force_ac97=1\n");
1526                                 printk(KERN_ERR "  or try sb16 or cs423x drivers instead.\n");
1527                                 err = -ENXIO;
1528                                 goto __error;
1529                         }
1530                 }
1531                 chip->buffer_end = 2560 * 1024;
1532                 chip->interrupt = snd_nm256_interrupt;
1533                 chip->mixer_status_offset = NM_MIXER_STATUS_OFFSET;
1534                 chip->mixer_status_mask = NM_MIXER_READY_MASK;
1535         } else {
1536                 /* Not sure if there is any relevant detect for the ZX or not.  */
1537                 if (snd_nm256_readb(chip, 0xa0b) != 0)
1538                         chip->buffer_end = 6144 * 1024;
1539                 else
1540                         chip->buffer_end = 4096 * 1024;
1541
1542                 chip->interrupt = snd_nm256_interrupt_zx;
1543                 chip->mixer_status_offset = NM2_MIXER_STATUS_OFFSET;
1544                 chip->mixer_status_mask = NM2_MIXER_READY_MASK;
1545         }
1546
1547         chip->buffer_size = chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize +
1548                 chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
1549         if (chip->use_cache)
1550                 chip->buffer_size += NM_TOTAL_COEFF_COUNT * 4;
1551         else
1552                 chip->buffer_size += NM_MAX_PLAYBACK_COEF_SIZE + NM_MAX_RECORD_COEF_SIZE;
1553
1554         if (buffer_top >= chip->buffer_size && buffer_top < chip->buffer_end)
1555                 chip->buffer_end = buffer_top;
1556         else {
1557                 /* get buffer end pointer from signature */
1558                 if ((err = snd_nm256_peek_for_sig(chip)) < 0)
1559                         goto __error;
1560         }
1561
1562         chip->buffer_start = chip->buffer_end - chip->buffer_size;
1563         chip->buffer_addr += chip->buffer_start;
1564
1565         printk(KERN_INFO "nm256: Mapping port 1 from 0x%x - 0x%x\n",
1566                chip->buffer_start, chip->buffer_end);
1567
1568         chip->res_buffer = request_mem_region(chip->buffer_addr,
1569                                               chip->buffer_size,
1570                                               card->driver);
1571         if (chip->res_buffer == NULL) {
1572                 snd_printk(KERN_ERR "nm256: buffer 0x%lx (size 0x%x) busy\n",
1573                            chip->buffer_addr, chip->buffer_size);
1574                 err = -EBUSY;
1575                 goto __error;
1576         }
1577         chip->buffer = ioremap_nocache(chip->buffer_addr, chip->buffer_size);
1578         if (chip->buffer == NULL) {
1579                 err = -ENOMEM;
1580                 snd_printk(KERN_ERR "unable to map ring buffer at %lx\n", chip->buffer_addr);
1581                 goto __error;
1582         }
1583
1584         /* set offsets */
1585         addr = chip->buffer_start;
1586         chip->streams[SNDRV_PCM_STREAM_PLAYBACK].buf = addr;
1587         addr += chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize;
1588         chip->streams[SNDRV_PCM_STREAM_CAPTURE].buf = addr;
1589         addr += chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
1590         if (chip->use_cache) {
1591                 chip->all_coeff_buf = addr;
1592         } else {
1593                 chip->coeff_buf[SNDRV_PCM_STREAM_PLAYBACK] = addr;
1594                 addr += NM_MAX_PLAYBACK_COEF_SIZE;
1595                 chip->coeff_buf[SNDRV_PCM_STREAM_CAPTURE] = addr;
1596         }
1597
1598         /* Fixed setting. */
1599         chip->mixer_base = NM_MIXER_OFFSET;
1600
1601         chip->coeffs_current = 0;
1602
1603         snd_nm256_init_chip(chip);
1604
1605         // pci_set_master(pci); /* needed? */
1606
1607         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0)
1608                 goto __error;
1609
1610         snd_card_set_dev(card, &pci->dev);
1611
1612         *chip_ret = chip;
1613         return 0;
1614
1615 __error:
1616         snd_nm256_free(chip);
1617         return err;
1618 }
1619
1620
1621 struct nm256_quirk {
1622         unsigned short vendor;
1623         unsigned short device;
1624         int type;
1625 };
1626
1627 enum { NM_BLACKLISTED, NM_RESET_WORKAROUND, NM_RESET_WORKAROUND_2 };
1628
1629 static struct nm256_quirk nm256_quirks[] __devinitdata = {
1630         /* HP omnibook 4150 has cs4232 codec internally */
1631         { .vendor = 0x103c, .device = 0x0007, .type = NM_BLACKLISTED },
1632         /* Sony PCG-F305 */
1633         { .vendor = 0x104d, .device = 0x8041, .type = NM_RESET_WORKAROUND },
1634         /* Dell Latitude LS */
1635         { .vendor = 0x1028, .device = 0x0080, .type = NM_RESET_WORKAROUND },
1636         /* Dell Latitude CSx */
1637         { .vendor = 0x1028, .device = 0x0091, .type = NM_RESET_WORKAROUND_2 },
1638         { } /* terminator */
1639 };
1640
1641
1642 static int __devinit snd_nm256_probe(struct pci_dev *pci,
1643                                      const struct pci_device_id *pci_id)
1644 {
1645         struct snd_card *card;
1646         struct nm256 *chip;
1647         int err;
1648         struct nm256_quirk *q;
1649         u16 subsystem_vendor, subsystem_device;
1650
1651         pci_read_config_word(pci, PCI_SUBSYSTEM_VENDOR_ID, &subsystem_vendor);
1652         pci_read_config_word(pci, PCI_SUBSYSTEM_ID, &subsystem_device);
1653
1654         for (q = nm256_quirks; q->vendor; q++) {
1655                 if (q->vendor == subsystem_vendor && q->device == subsystem_device) {
1656                         switch (q->type) {
1657                         case NM_BLACKLISTED:
1658                                 printk(KERN_INFO "nm256: The device is blacklisted. "
1659                                        "Loading stopped\n");
1660                                 return -ENODEV;
1661                         case NM_RESET_WORKAROUND_2:
1662                                 reset_workaround_2 = 1;
1663                                 /* Fall-through */
1664                         case NM_RESET_WORKAROUND:
1665                                 reset_workaround = 1;
1666                                 break;
1667                         }
1668                 }
1669         }
1670
1671         card = snd_card_new(index, id, THIS_MODULE, 0);
1672         if (card == NULL)
1673                 return -ENOMEM;
1674
1675         switch (pci->device) {
1676         case PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO:
1677                 strcpy(card->driver, "NM256AV");
1678                 break;
1679         case PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO:
1680                 strcpy(card->driver, "NM256ZX");
1681                 break;
1682         case PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO:
1683                 strcpy(card->driver, "NM256XL+");
1684                 break;
1685         default:
1686                 snd_printk(KERN_ERR "invalid device id 0x%x\n", pci->device);
1687                 snd_card_free(card);
1688                 return -EINVAL;
1689         }
1690
1691         if (vaio_hack)
1692                 buffer_top = 0x25a800;  /* this avoids conflicts with XFree86 server */
1693
1694         if (playback_bufsize < 4)
1695                 playback_bufsize = 4;
1696         if (playback_bufsize > 128)
1697                 playback_bufsize = 128;
1698         if (capture_bufsize < 4)
1699                 capture_bufsize = 4;
1700         if (capture_bufsize > 128)
1701                 capture_bufsize = 128;
1702         if ((err = snd_nm256_create(card, pci, &chip)) < 0) {
1703                 snd_card_free(card);
1704                 return err;
1705         }
1706         card->private_data = chip;
1707
1708         if (reset_workaround) {
1709                 snd_printdd(KERN_INFO "nm256: reset_workaround activated\n");
1710                 chip->reset_workaround = 1;
1711         }
1712
1713         if (reset_workaround_2) {
1714                 snd_printdd(KERN_INFO "nm256: reset_workaround_2 activated\n");
1715                 chip->reset_workaround_2 = 1;
1716         }
1717
1718         if ((err = snd_nm256_pcm(chip, 0)) < 0 ||
1719             (err = snd_nm256_mixer(chip)) < 0) {
1720                 snd_card_free(card);
1721                 return err;
1722         }
1723
1724         sprintf(card->shortname, "NeoMagic %s", card->driver);
1725         sprintf(card->longname, "%s at 0x%lx & 0x%lx, irq %d",
1726                 card->shortname,
1727                 chip->buffer_addr, chip->cport_addr, chip->irq);
1728
1729         if ((err = snd_card_register(card)) < 0) {
1730                 snd_card_free(card);
1731                 return err;
1732         }
1733
1734         pci_set_drvdata(pci, card);
1735         return 0;
1736 }
1737
1738 static void __devexit snd_nm256_remove(struct pci_dev *pci)
1739 {
1740         snd_card_free(pci_get_drvdata(pci));
1741         pci_set_drvdata(pci, NULL);
1742 }
1743
1744
1745 static struct pci_driver driver = {
1746         .name = "NeoMagic 256",
1747         .id_table = snd_nm256_ids,
1748         .probe = snd_nm256_probe,
1749         .remove = __devexit_p(snd_nm256_remove),
1750 #ifdef CONFIG_PM
1751         .suspend = nm256_suspend,
1752         .resume = nm256_resume,
1753 #endif
1754 };
1755
1756
1757 static int __init alsa_card_nm256_init(void)
1758 {
1759         return pci_register_driver(&driver);
1760 }
1761
1762 static void __exit alsa_card_nm256_exit(void)
1763 {
1764         pci_unregister_driver(&driver);
1765 }
1766
1767 module_init(alsa_card_nm256_init)
1768 module_exit(alsa_card_nm256_exit)