git.oblomov.eu Git - linux-2.6/blob - 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 <asm/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/moduleparam.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 int force_ac97;                  /* disabled as default */
  61 static int buffer_top;                  /* not specified */
  62 static int use_cache;                   /* disabled */
  63 static int vaio_hack;                   /* disabled */
  64 static int reset_workaround;
  65 static int 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 int 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 struct pci_device_id snd_nm256_ids[] = {
 266         {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 267         {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 268         {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 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                 snd_printk(KERN_ERR "write_buffer invalid offset = %d size = %d\n",
 322                            offset, size);
 323                 return;
 324         }
 325 #endif
 326         memcpy_toio(chip->buffer + offset, src, size);
 327 }
 328
 329 /*
 330  * coefficient handlers -- what a magic!
 331  */
 332
 333 static u16
 334 snd_nm256_get_start_offset(int which)
 335 {
 336         u16 offset = 0;
 337         while (which-- > 0)
 338                 offset += coefficient_sizes[which];
 339         return offset;
 340 }
 341
 342 static void
 343 snd_nm256_load_one_coefficient(struct nm256 *chip, int stream, u32 port, int which)
 344 {
 345         u32 coeff_buf = chip->coeff_buf[stream];
 346         u16 offset = snd_nm256_get_start_offset(which);
 347         u16 size = coefficient_sizes[which];
 348
 349         snd_nm256_write_buffer(chip, coefficients + offset, coeff_buf, size);
 350         snd_nm256_writel(chip, port, coeff_buf);
 351         /* ???  Record seems to behave differently than playback.  */
 352         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 353                 size--;
 354         snd_nm256_writel(chip, port + 4, coeff_buf + size);
 355 }
 356
 357 static void
 358 snd_nm256_load_coefficient(struct nm256 *chip, int stream, int number)
 359 {
 360         /* The enable register for the specified engine.  */
 361         u32 poffset = (stream == SNDRV_PCM_STREAM_CAPTURE ?
 362                        NM_RECORD_ENABLE_REG : NM_PLAYBACK_ENABLE_REG);
 363         u32 addr = NM_COEFF_START_OFFSET;
 364
 365         addr += (stream == SNDRV_PCM_STREAM_CAPTURE ?
 366                  NM_RECORD_REG_OFFSET : NM_PLAYBACK_REG_OFFSET);
 367
 368         if (snd_nm256_readb(chip, poffset) & 1) {
 369                 snd_printd("NM256: Engine was enabled while loading coefficients!\n");
 370                 return;
 371         }
 372
 373         /* The recording engine uses coefficient values 8-15.  */
 374         number &= 7;
 375         if (stream == SNDRV_PCM_STREAM_CAPTURE)
 376                 number += 8;
 377
 378         if (! chip->use_cache) {
 379                 snd_nm256_load_one_coefficient(chip, stream, addr, number);
 380                 return;
 381         }
 382         if (! chip->coeffs_current) {
 383                 snd_nm256_write_buffer(chip, coefficients, chip->all_coeff_buf,
 384                                        NM_TOTAL_COEFF_COUNT * 4);
 385                 chip->coeffs_current = 1;
 386         } else {
 387                 u32 base = chip->all_coeff_buf;
 388                 u32 offset = snd_nm256_get_start_offset(number);
 389                 u32 end_offset = offset + coefficient_sizes[number];
 390                 snd_nm256_writel(chip, addr, base + offset);
 391                 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 392                         end_offset--;
 393                 snd_nm256_writel(chip, addr + 4, base + end_offset);
 394         }
 395 }
 396
 397
 398 /* The actual rates supported by the card. */
 399 static unsigned int samplerates[8] = {
 400         8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000,
 401 };
 402 static struct snd_pcm_hw_constraint_list constraints_rates = {
 403         .count = ARRAY_SIZE(samplerates),
 404         .list = samplerates,
 405         .mask = 0,
 406 };
 407
 408 /*
 409  * return the index of the target rate
 410  */
 411 static int
 412 snd_nm256_fixed_rate(unsigned int rate)
 413 {
 414         unsigned int i;
 415         for (i = 0; i < ARRAY_SIZE(samplerates); i++) {
 416                 if (rate == samplerates[i])
 417                         return i;
 418         }
 419         snd_BUG();
 420         return 0;
 421 }
 422
 423 /*
 424  * set sample rate and format
 425  */
 426 static void
 427 snd_nm256_set_format(struct nm256 *chip, struct nm256_stream *s,
 428                      struct snd_pcm_substream *substream)
 429 {
 430         struct snd_pcm_runtime *runtime = substream->runtime;
 431         int rate_index = snd_nm256_fixed_rate(runtime->rate);
 432         unsigned char ratebits = (rate_index << 4) & NM_RATE_MASK;
 433
 434         s->shift = 0;
 435         if (snd_pcm_format_width(runtime->format) == 16) {
 436                 ratebits |= NM_RATE_BITS_16;
 437                 s->shift++;
 438         }
 439         if (runtime->channels > 1) {
 440                 ratebits |= NM_RATE_STEREO;
 441                 s->shift++;
 442         }
 443
 444         runtime->rate = samplerates[rate_index];
 445
 446         switch (substream->stream) {
 447         case SNDRV_PCM_STREAM_PLAYBACK:
 448                 snd_nm256_load_coefficient(chip, 0, rate_index); /* 0 = playback */
 449                 snd_nm256_writeb(chip,
 450                                  NM_PLAYBACK_REG_OFFSET + NM_RATE_REG_OFFSET,
 451                                  ratebits);
 452                 break;
 453         case SNDRV_PCM_STREAM_CAPTURE:
 454                 snd_nm256_load_coefficient(chip, 1, rate_index); /* 1 = record */
 455                 snd_nm256_writeb(chip,
 456                                  NM_RECORD_REG_OFFSET + NM_RATE_REG_OFFSET,
 457                                  ratebits);
 458                 break;
 459         }
 460 }
 461
 462 /* acquire interrupt */
 463 static int snd_nm256_acquire_irq(struct nm256 *chip)
 464 {
 465         mutex_lock(&chip->irq_mutex);
 466         if (chip->irq < 0) {
 467                 if (request_irq(chip->pci->irq, chip->interrupt, IRQF_SHARED,
 468                                 chip->card->driver, chip)) {
 469                         snd_printk(KERN_ERR "unable to grab IRQ %d\n", chip->pci->irq);
 470                         mutex_unlock(&chip->irq_mutex);
 471                         return -EBUSY;
 472                 }
 473                 chip->irq = chip->pci->irq;
 474         }
 475         chip->irq_acks++;
 476         mutex_unlock(&chip->irq_mutex);
 477         return 0;
 478 }
 479
 480 /* release interrupt */
 481 static void snd_nm256_release_irq(struct nm256 *chip)
 482 {
 483         mutex_lock(&chip->irq_mutex);
 484         if (chip->irq_acks > 0)
 485                 chip->irq_acks--;
 486         if (chip->irq_acks == 0 && chip->irq >= 0) {
 487                 free_irq(chip->irq, chip);
 488                 chip->irq = -1;
 489         }
 490         mutex_unlock(&chip->irq_mutex);
 491 }
 492
 493 /*
 494  * start / stop
 495  */
 496
 497 /* update the watermark (current period) */
 498 static void snd_nm256_pcm_mark(struct nm256 *chip, struct nm256_stream *s, int reg)
 499 {
 500         s->cur_period++;
 501         s->cur_period %= s->periods;
 502         snd_nm256_writel(chip, reg, s->buf + s->cur_period * s->period_size);
 503 }
 504
 505 #define snd_nm256_playback_mark(chip, s) snd_nm256_pcm_mark(chip, s, NM_PBUFFER_WMARK)
 506 #define snd_nm256_capture_mark(chip, s)  snd_nm256_pcm_mark(chip, s, NM_RBUFFER_WMARK)
 507
 508 static void
 509 snd_nm256_playback_start(struct nm256 *chip, struct nm256_stream *s,
 510                          struct snd_pcm_substream *substream)
 511 {
 512         /* program buffer pointers */
 513         snd_nm256_writel(chip, NM_PBUFFER_START, s->buf);
 514         snd_nm256_writel(chip, NM_PBUFFER_END, s->buf + s->dma_size - (1 << s->shift));
 515         snd_nm256_writel(chip, NM_PBUFFER_CURRP, s->buf);
 516         snd_nm256_playback_mark(chip, s);
 517
 518         /* Enable playback engine and interrupts. */
 519         snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG,
 520                          NM_PLAYBACK_ENABLE_FLAG | NM_PLAYBACK_FREERUN);
 521         /* Enable both channels. */
 522         snd_nm256_writew(chip, NM_AUDIO_MUTE_REG, 0x0);
 523 }
 524
 525 static void
 526 snd_nm256_capture_start(struct nm256 *chip, struct nm256_stream *s,
 527                         struct snd_pcm_substream *substream)
 528 {
 529         /* program buffer pointers */
 530         snd_nm256_writel(chip, NM_RBUFFER_START, s->buf);
 531         snd_nm256_writel(chip, NM_RBUFFER_END, s->buf + s->dma_size);
 532         snd_nm256_writel(chip, NM_RBUFFER_CURRP, s->buf);
 533         snd_nm256_capture_mark(chip, s);
 534
 535         /* Enable playback engine and interrupts. */
 536         snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG,
 537                          NM_RECORD_ENABLE_FLAG | NM_RECORD_FREERUN);
 538 }
 539
 540 /* Stop the play engine. */
 541 static void
 542 snd_nm256_playback_stop(struct nm256 *chip)
 543 {
 544         /* Shut off sound from both channels. */
 545         snd_nm256_writew(chip, NM_AUDIO_MUTE_REG,
 546                          NM_AUDIO_MUTE_LEFT | NM_AUDIO_MUTE_RIGHT);
 547         /* Disable play engine. */
 548         snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG, 0);
 549 }
 550
 551 static void
 552 snd_nm256_capture_stop(struct nm256 *chip)
 553 {
 554         /* Disable recording engine. */
 555         snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG, 0);
 556 }
 557
 558 static int
 559 snd_nm256_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 560 {
 561         struct nm256 *chip = snd_pcm_substream_chip(substream);
 562         struct nm256_stream *s = substream->runtime->private_data;
 563         int err = 0;
 564
 565         snd_assert(s != NULL, return -ENXIO);
 566
 567         spin_lock(&chip->reg_lock);
 568         switch (cmd) {
 569         case SNDRV_PCM_TRIGGER_RESUME:
 570                 s->suspended = 0;
 571                 /* fallthru */
 572         case SNDRV_PCM_TRIGGER_START:
 573                 if (! s->running) {
 574                         snd_nm256_playback_start(chip, s, substream);
 575                         s->running = 1;
 576                 }
 577                 break;
 578         case SNDRV_PCM_TRIGGER_SUSPEND:
 579                 s->suspended = 1;
 580                 /* fallthru */
 581         case SNDRV_PCM_TRIGGER_STOP:
 582                 if (s->running) {
 583                         snd_nm256_playback_stop(chip);
 584                         s->running = 0;
 585                 }
 586                 break;
 587         default:
 588                 err = -EINVAL;
 589                 break;
 590         }
 591         spin_unlock(&chip->reg_lock);
 592         return err;
 593 }
 594
 595 static int
 596 snd_nm256_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 597 {
 598         struct nm256 *chip = snd_pcm_substream_chip(substream);
 599         struct nm256_stream *s = substream->runtime->private_data;
 600         int err = 0;
 601
 602         snd_assert(s != NULL, return -ENXIO);
 603
 604         spin_lock(&chip->reg_lock);
 605         switch (cmd) {
 606         case SNDRV_PCM_TRIGGER_START:
 607         case SNDRV_PCM_TRIGGER_RESUME:
 608                 if (! s->running) {
 609                         snd_nm256_capture_start(chip, s, substream);
 610                         s->running = 1;
 611                 }
 612                 break;
 613         case SNDRV_PCM_TRIGGER_STOP:
 614         case SNDRV_PCM_TRIGGER_SUSPEND:
 615                 if (s->running) {
 616                         snd_nm256_capture_stop(chip);
 617                         s->running = 0;
 618                 }
 619                 break;
 620         default:
 621                 err = -EINVAL;
 622                 break;
 623         }
 624         spin_unlock(&chip->reg_lock);
 625         return err;
 626 }
 627
 628
 629 /*
 630  * prepare playback/capture channel
 631  */
 632 static int snd_nm256_pcm_prepare(struct snd_pcm_substream *substream)
 633 {
 634         struct nm256 *chip = snd_pcm_substream_chip(substream);
 635         struct snd_pcm_runtime *runtime = substream->runtime;
 636         struct nm256_stream *s = runtime->private_data;
 637
 638         snd_assert(s, return -ENXIO);
 639         s->dma_size = frames_to_bytes(runtime, substream->runtime->buffer_size);
 640         s->period_size = frames_to_bytes(runtime, substream->runtime->period_size);
 641         s->periods = substream->runtime->periods;
 642         s->cur_period = 0;
 643
 644         spin_lock_irq(&chip->reg_lock);
 645         s->running = 0;
 646         snd_nm256_set_format(chip, s, substream);
 647         spin_unlock_irq(&chip->reg_lock);
 648
 649         return 0;
 650 }
 651
 652
 653 /*
 654  * get the current pointer
 655  */
 656 static snd_pcm_uframes_t
 657 snd_nm256_playback_pointer(struct snd_pcm_substream *substream)
 658 {
 659         struct nm256 *chip = snd_pcm_substream_chip(substream);
 660         struct nm256_stream *s = substream->runtime->private_data;
 661         unsigned long curp;
 662
 663         snd_assert(s, return 0);
 664         curp = snd_nm256_readl(chip, NM_PBUFFER_CURRP) - (unsigned long)s->buf;
 665         curp %= s->dma_size;
 666         return bytes_to_frames(substream->runtime, curp);
 667 }
 668
 669 static snd_pcm_uframes_t
 670 snd_nm256_capture_pointer(struct snd_pcm_substream *substream)
 671 {
 672         struct nm256 *chip = snd_pcm_substream_chip(substream);
 673         struct nm256_stream *s = substream->runtime->private_data;
 674         unsigned long curp;
 675
 676         snd_assert(s != NULL, return 0);
 677         curp = snd_nm256_readl(chip, NM_RBUFFER_CURRP) - (unsigned long)s->buf;
 678         curp %= s->dma_size;
 679         return bytes_to_frames(substream->runtime, curp);
 680 }
 681
 682 /* Remapped I/O space can be accessible as pointer on i386 */
 683 /* This might be changed in the future */
 684 #ifndef __i386__
 685 /*
 686  * silence / copy for playback
 687  */
 688 static int
 689 snd_nm256_playback_silence(struct snd_pcm_substream *substream,
 690                            int channel, /* not used (interleaved data) */
 691                            snd_pcm_uframes_t pos,
 692                            snd_pcm_uframes_t count)
 693 {
 694         struct snd_pcm_runtime *runtime = substream->runtime;
 695         struct nm256_stream *s = runtime->private_data;
 696         count = frames_to_bytes(runtime, count);
 697         pos = frames_to_bytes(runtime, pos);
 698         memset_io(s->bufptr + pos, 0, count);
 699         return 0;
 700 }
 701
 702 static int
 703 snd_nm256_playback_copy(struct snd_pcm_substream *substream,
 704                         int channel, /* not used (interleaved data) */
 705                         snd_pcm_uframes_t pos,
 706                         void __user *src,
 707                         snd_pcm_uframes_t count)
 708 {
 709         struct snd_pcm_runtime *runtime = substream->runtime;
 710         struct nm256_stream *s = runtime->private_data;
 711         count = frames_to_bytes(runtime, count);
 712         pos = frames_to_bytes(runtime, pos);
 713         if (copy_from_user_toio(s->bufptr + pos, src, count))
 714                 return -EFAULT;
 715         return 0;
 716 }
 717
 718 /*
 719  * copy to user
 720  */
 721 static int
 722 snd_nm256_capture_copy(struct snd_pcm_substream *substream,
 723                        int channel, /* not used (interleaved data) */
 724                        snd_pcm_uframes_t pos,
 725                        void __user *dst,
 726                        snd_pcm_uframes_t count)
 727 {
 728         struct snd_pcm_runtime *runtime = substream->runtime;
 729         struct nm256_stream *s = runtime->private_data;
 730         count = frames_to_bytes(runtime, count);
 731         pos = frames_to_bytes(runtime, pos);
 732         if (copy_to_user_fromio(dst, s->bufptr + pos, count))
 733                 return -EFAULT;
 734         return 0;
 735 }
 736
 737 #endif /* !__i386__ */
 738
 739
 740 /*
 741  * update playback/capture watermarks
 742  */
 743
 744 /* spinlock held! */
 745 static void
 746 snd_nm256_playback_update(struct nm256 *chip)
 747 {
 748         struct nm256_stream *s;
 749
 750         s = &chip->streams[SNDRV_PCM_STREAM_PLAYBACK];
 751         if (s->running && s->substream) {
 752                 spin_unlock(&chip->reg_lock);
 753                 snd_pcm_period_elapsed(s->substream);
 754                 spin_lock(&chip->reg_lock);
 755                 snd_nm256_playback_mark(chip, s);
 756         }
 757 }
 758
 759 /* spinlock held! */
 760 static void
 761 snd_nm256_capture_update(struct nm256 *chip)
 762 {
 763         struct nm256_stream *s;
 764
 765         s = &chip->streams[SNDRV_PCM_STREAM_CAPTURE];
 766         if (s->running && s->substream) {
 767                 spin_unlock(&chip->reg_lock);
 768                 snd_pcm_period_elapsed(s->substream);
 769                 spin_lock(&chip->reg_lock);
 770                 snd_nm256_capture_mark(chip, s);
 771         }
 772 }
 773
 774 /*
 775  * hardware info
 776  */
 777 static struct snd_pcm_hardware snd_nm256_playback =
 778 {
 779         .info =                 SNDRV_PCM_INFO_MMAP_IOMEM |SNDRV_PCM_INFO_MMAP_VALID |
 780                                 SNDRV_PCM_INFO_INTERLEAVED |
 781                                 /*SNDRV_PCM_INFO_PAUSE |*/
 782                                 SNDRV_PCM_INFO_RESUME,
 783         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
 784         .rates =                SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
 785         .rate_min =             8000,
 786         .rate_max =             48000,
 787         .channels_min =         1,
 788         .channels_max =         2,
 789         .periods_min =          2,
 790         .periods_max =          1024,
 791         .buffer_bytes_max =     128 * 1024,
 792         .period_bytes_min =     256,
 793         .period_bytes_max =     128 * 1024,
 794 };
 795
 796 static struct snd_pcm_hardware snd_nm256_capture =
 797 {
 798         .info =                 SNDRV_PCM_INFO_MMAP_IOMEM | SNDRV_PCM_INFO_MMAP_VALID |
 799                                 SNDRV_PCM_INFO_INTERLEAVED |
 800                                 /*SNDRV_PCM_INFO_PAUSE |*/
 801                                 SNDRV_PCM_INFO_RESUME,
 802         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
 803         .rates =                SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
 804         .rate_min =             8000,
 805         .rate_max =             48000,
 806         .channels_min =         1,
 807         .channels_max =         2,
 808         .periods_min =          2,
 809         .periods_max =          1024,
 810         .buffer_bytes_max =     128 * 1024,
 811         .period_bytes_min =     256,
 812         .period_bytes_max =     128 * 1024,
 813 };
 814
 815
 816 /* set dma transfer size */
 817 static int snd_nm256_pcm_hw_params(struct snd_pcm_substream *substream,
 818                                    struct snd_pcm_hw_params *hw_params)
 819 {
 820         /* area and addr are already set and unchanged */
 821         substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
 822         return 0;
 823 }
 824
 825 /*
 826  * open
 827  */
 828 static void snd_nm256_setup_stream(struct nm256 *chip, struct nm256_stream *s,
 829                                    struct snd_pcm_substream *substream,
 830                                    struct snd_pcm_hardware *hw_ptr)
 831 {
 832         struct snd_pcm_runtime *runtime = substream->runtime;
 833
 834         s->running = 0;
 835         runtime->hw = *hw_ptr;
 836         runtime->hw.buffer_bytes_max = s->bufsize;
 837         runtime->hw.period_bytes_max = s->bufsize / 2;
 838         runtime->dma_area = (void __force *) s->bufptr;
 839         runtime->dma_addr = s->bufptr_addr;
 840         runtime->dma_bytes = s->bufsize;
 841         runtime->private_data = s;
 842         s->substream = substream;
 843
 844         snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 845                                    &constraints_rates);
 846 }
 847
 848 static int
 849 snd_nm256_playback_open(struct snd_pcm_substream *substream)
 850 {
 851         struct nm256 *chip = snd_pcm_substream_chip(substream);
 852
 853         if (snd_nm256_acquire_irq(chip) < 0)
 854                 return -EBUSY;
 855         snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_PLAYBACK],
 856                                substream, &snd_nm256_playback);
 857         return 0;
 858 }
 859
 860 static int
 861 snd_nm256_capture_open(struct snd_pcm_substream *substream)
 862 {
 863         struct nm256 *chip = snd_pcm_substream_chip(substream);
 864
 865         if (snd_nm256_acquire_irq(chip) < 0)
 866                 return -EBUSY;
 867         snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_CAPTURE],
 868                                substream, &snd_nm256_capture);
 869         return 0;
 870 }
 871
 872 /*
 873  * close - we don't have to do special..
 874  */
 875 static int
 876 snd_nm256_playback_close(struct snd_pcm_substream *substream)
 877 {
 878         struct nm256 *chip = snd_pcm_substream_chip(substream);
 879
 880         snd_nm256_release_irq(chip);
 881         return 0;
 882 }
 883
 884
 885 static int
 886 snd_nm256_capture_close(struct snd_pcm_substream *substream)
 887 {
 888         struct nm256 *chip = snd_pcm_substream_chip(substream);
 889
 890         snd_nm256_release_irq(chip);
 891         return 0;
 892 }
 893
 894 /*
 895  * create a pcm instance
 896  */
 897 static struct snd_pcm_ops snd_nm256_playback_ops = {
 898         .open =         snd_nm256_playback_open,
 899         .close =        snd_nm256_playback_close,
 900         .ioctl =        snd_pcm_lib_ioctl,
 901         .hw_params =    snd_nm256_pcm_hw_params,
 902         .prepare =      snd_nm256_pcm_prepare,
 903         .trigger =      snd_nm256_playback_trigger,
 904         .pointer =      snd_nm256_playback_pointer,
 905 #ifndef __i386__
 906         .copy =         snd_nm256_playback_copy,
 907         .silence =      snd_nm256_playback_silence,
 908 #endif
 909         .mmap =         snd_pcm_lib_mmap_iomem,
 910 };
 911
 912 static struct snd_pcm_ops snd_nm256_capture_ops = {
 913         .open =         snd_nm256_capture_open,
 914         .close =        snd_nm256_capture_close,
 915         .ioctl =        snd_pcm_lib_ioctl,
 916         .hw_params =    snd_nm256_pcm_hw_params,
 917         .prepare =      snd_nm256_pcm_prepare,
 918         .trigger =      snd_nm256_capture_trigger,
 919         .pointer =      snd_nm256_capture_pointer,
 920 #ifndef __i386__
 921         .copy =         snd_nm256_capture_copy,
 922 #endif
 923         .mmap =         snd_pcm_lib_mmap_iomem,
 924 };
 925
 926 static int __devinit
 927 snd_nm256_pcm(struct nm256 *chip, int device)
 928 {
 929         struct snd_pcm *pcm;
 930         int i, err;
 931
 932         for (i = 0; i < 2; i++) {
 933                 struct nm256_stream *s = &chip->streams[i];
 934                 s->bufptr = chip->buffer + (s->buf - chip->buffer_start);
 935                 s->bufptr_addr = chip->buffer_addr + (s->buf - chip->buffer_start);
 936         }
 937
 938         err = snd_pcm_new(chip->card, chip->card->driver, device,
 939                           1, 1, &pcm);
 940         if (err < 0)
 941                 return err;
 942
 943         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_nm256_playback_ops);
 944         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_nm256_capture_ops);
 945
 946         pcm->private_data = chip;
 947         pcm->info_flags = 0;
 948         chip->pcm = pcm;
 949
 950         return 0;
 951 }
 952
 953
 954 /*
 955  * Initialize the hardware.
 956  */
 957 static void
 958 snd_nm256_init_chip(struct nm256 *chip)
 959 {
 960         /* Reset everything. */
 961         snd_nm256_writeb(chip, 0x0, 0x11);
 962         snd_nm256_writew(chip, 0x214, 0);
 963         /* stop sounds.. */
 964         //snd_nm256_playback_stop(chip);
 965         //snd_nm256_capture_stop(chip);
 966 }
 967
 968
 969 static irqreturn_t
 970 snd_nm256_intr_check(struct nm256 *chip)
 971 {
 972         if (chip->badintrcount++ > 1000) {
 973                 /*
 974                  * I'm not sure if the best thing is to stop the card from
 975                  * playing or just release the interrupt (after all, we're in
 976                  * a bad situation, so doing fancy stuff may not be such a good
 977                  * idea).
 978                  *
 979                  * I worry about the card engine continuing to play noise
 980                  * over and over, however--that could become a very
 981                  * obnoxious problem.  And we know that when this usually
 982                  * happens things are fairly safe, it just means the user's
 983                  * inserted a PCMCIA card and someone's spamming us with IRQ 9s.
 984                  */
 985                 if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
 986                         snd_nm256_playback_stop(chip);
 987                 if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
 988                         snd_nm256_capture_stop(chip);
 989                 chip->badintrcount = 0;
 990                 return IRQ_HANDLED;
 991         }
 992         return IRQ_NONE;
 993 }
 994
 995 /*
 996  * Handle a potential interrupt for the device referred to by DEV_ID.
 997  *
 998  * I don't like the cut-n-paste job here either between the two routines,
 999  * but there are sufficient differences between the two interrupt handlers
1000  * that parameterizing it isn't all that great either.  (Could use a macro,
1001  * I suppose...yucky bleah.)
1002  */
1003
1004 static irqreturn_t
1005 snd_nm256_interrupt(int irq, void *dev_id)
1006 {
1007         struct nm256 *chip = dev_id;
1008         u16 status;
1009         u8 cbyte;
1010
1011         status = snd_nm256_readw(chip, NM_INT_REG);
1012
1013         /* Not ours. */
1014         if (status == 0)
1015                 return snd_nm256_intr_check(chip);
1016
1017         chip->badintrcount = 0;
1018
1019         /* Rather boring; check for individual interrupts and process them. */
1020
1021         spin_lock(&chip->reg_lock);
1022         if (status & NM_PLAYBACK_INT) {
1023                 status &= ~NM_PLAYBACK_INT;
1024                 NM_ACK_INT(chip, NM_PLAYBACK_INT);
1025                 snd_nm256_playback_update(chip);
1026         }
1027
1028         if (status & NM_RECORD_INT) {
1029                 status &= ~NM_RECORD_INT;
1030                 NM_ACK_INT(chip, NM_RECORD_INT);
1031                 snd_nm256_capture_update(chip);
1032         }
1033
1034         if (status & NM_MISC_INT_1) {
1035                 status &= ~NM_MISC_INT_1;
1036                 NM_ACK_INT(chip, NM_MISC_INT_1);
1037                 snd_printd("NM256: Got misc interrupt #1\n");
1038                 snd_nm256_writew(chip, NM_INT_REG, 0x8000);
1039                 cbyte = snd_nm256_readb(chip, 0x400);
1040                 snd_nm256_writeb(chip, 0x400, cbyte | 2);
1041         }
1042
1043         if (status & NM_MISC_INT_2) {
1044                 status &= ~NM_MISC_INT_2;
1045                 NM_ACK_INT(chip, NM_MISC_INT_2);
1046                 snd_printd("NM256: Got misc interrupt #2\n");
1047                 cbyte = snd_nm256_readb(chip, 0x400);
1048                 snd_nm256_writeb(chip, 0x400, cbyte & ~2);
1049         }
1050
1051         /* Unknown interrupt. */
1052         if (status) {
1053                 snd_printd("NM256: Fire in the hole! Unknown status 0x%x\n",
1054                            status);
1055                 /* Pray. */
1056                 NM_ACK_INT(chip, status);
1057         }
1058
1059         spin_unlock(&chip->reg_lock);
1060         return IRQ_HANDLED;
1061 }
1062
1063 /*
1064  * Handle a potential interrupt for the device referred to by DEV_ID.
1065  * This handler is for the 256ZX, and is very similar to the non-ZX
1066  * routine.
1067  */
1068
1069 static irqreturn_t
1070 snd_nm256_interrupt_zx(int irq, void *dev_id)
1071 {
1072         struct nm256 *chip = dev_id;
1073         u32 status;
1074         u8 cbyte;
1075
1076         status = snd_nm256_readl(chip, NM_INT_REG);
1077
1078         /* Not ours. */
1079         if (status == 0)
1080                 return snd_nm256_intr_check(chip);
1081
1082         chip->badintrcount = 0;
1083
1084         /* Rather boring; check for individual interrupts and process them. */
1085
1086         spin_lock(&chip->reg_lock);
1087         if (status & NM2_PLAYBACK_INT) {
1088                 status &= ~NM2_PLAYBACK_INT;
1089                 NM2_ACK_INT(chip, NM2_PLAYBACK_INT);
1090                 snd_nm256_playback_update(chip);
1091         }
1092
1093         if (status & NM2_RECORD_INT) {
1094                 status &= ~NM2_RECORD_INT;
1095                 NM2_ACK_INT(chip, NM2_RECORD_INT);
1096                 snd_nm256_capture_update(chip);
1097         }
1098
1099         if (status & NM2_MISC_INT_1) {
1100                 status &= ~NM2_MISC_INT_1;
1101                 NM2_ACK_INT(chip, NM2_MISC_INT_1);
1102                 snd_printd("NM256: Got misc interrupt #1\n");
1103                 cbyte = snd_nm256_readb(chip, 0x400);
1104                 snd_nm256_writeb(chip, 0x400, cbyte | 2);
1105         }
1106
1107         if (status & NM2_MISC_INT_2) {
1108                 status &= ~NM2_MISC_INT_2;
1109                 NM2_ACK_INT(chip, NM2_MISC_INT_2);
1110                 snd_printd("NM256: Got misc interrupt #2\n");
1111                 cbyte = snd_nm256_readb(chip, 0x400);
1112                 snd_nm256_writeb(chip, 0x400, cbyte & ~2);
1113         }
1114
1115         /* Unknown interrupt. */
1116         if (status) {
1117                 snd_printd("NM256: Fire in the hole! Unknown status 0x%x\n",
1118                            status);
1119                 /* Pray. */
1120                 NM2_ACK_INT(chip, status);
1121         }
1122
1123         spin_unlock(&chip->reg_lock);
1124         return IRQ_HANDLED;
1125 }
1126
1127 /*
1128  * AC97 interface
1129  */
1130
1131 /*
1132  * Waits for the mixer to become ready to be written; returns a zero value
1133  * if it timed out.
1134  */
1135 static int
1136 snd_nm256_ac97_ready(struct nm256 *chip)
1137 {
1138         int timeout = 10;
1139         u32 testaddr;
1140         u16 testb;
1141
1142         testaddr = chip->mixer_status_offset;
1143         testb = chip->mixer_status_mask;
1144
1145         /*
1146          * Loop around waiting for the mixer to become ready.
1147          */
1148         while (timeout-- > 0) {
1149                 if ((snd_nm256_readw(chip, testaddr) & testb) == 0)
1150                         return 1;
1151                 udelay(100);
1152         }
1153         return 0;
1154 }
1155
1156 /*
1157  * Initial register values to be written to the AC97 mixer.
1158  * While most of these are identical to the reset values, we do this
1159  * so that we have most of the register contents cached--this avoids
1160  * reading from the mixer directly (which seems to be problematic,
1161  * probably due to ignorance).
1162  */
1163
1164 struct initialValues {
1165         unsigned short reg;
1166         unsigned short value;
1167 };
1168
1169 static struct initialValues nm256_ac97_init_val[] =
1170 {
1171         { AC97_MASTER,          0x8000 },
1172         { AC97_HEADPHONE,       0x8000 },
1173         { AC97_MASTER_MONO,     0x8000 },
1174         { AC97_PC_BEEP,         0x8000 },
1175         { AC97_PHONE,           0x8008 },
1176         { AC97_MIC,             0x8000 },
1177         { AC97_LINE,            0x8808 },
1178         { AC97_CD,              0x8808 },
1179         { AC97_VIDEO,           0x8808 },
1180         { AC97_AUX,             0x8808 },
1181         { AC97_PCM,             0x8808 },
1182         { AC97_REC_SEL,         0x0000 },
1183         { AC97_REC_GAIN,        0x0B0B },
1184         { AC97_GENERAL_PURPOSE, 0x0000 },
1185         { AC97_3D_CONTROL,      0x8000 },
1186         { AC97_VENDOR_ID1,      0x8384 },
1187         { AC97_VENDOR_ID2,      0x7609 },
1188 };
1189
1190 static int nm256_ac97_idx(unsigned short reg)
1191 {
1192         int i;
1193         for (i = 0; i < ARRAY_SIZE(nm256_ac97_init_val); i++)
1194                 if (nm256_ac97_init_val[i].reg == reg)
1195                         return i;
1196         return -1;
1197 }
1198
1199 /*
1200  * some nm256 easily crash when reading from mixer registers
1201  * thus we're treating it as a write-only mixer and cache the
1202  * written values
1203  */
1204 static unsigned short
1205 snd_nm256_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
1206 {
1207         struct nm256 *chip = ac97->private_data;
1208         int idx = nm256_ac97_idx(reg);
1209
1210         if (idx < 0)
1211                 return 0;
1212         return chip->ac97_regs[idx];
1213 }
1214
1215 /*
1216  */
1217 static void
1218 snd_nm256_ac97_write(struct snd_ac97 *ac97,
1219                      unsigned short reg, unsigned short val)
1220 {
1221         struct nm256 *chip = ac97->private_data;
1222         int tries = 2;
1223         int idx = nm256_ac97_idx(reg);
1224         u32 base;
1225
1226         if (idx < 0)
1227                 return;
1228
1229         base = chip->mixer_base;
1230
1231         snd_nm256_ac97_ready(chip);
1232
1233         /* Wait for the write to take, too. */
1234         while (tries-- > 0) {
1235                 snd_nm256_writew(chip, base + reg, val);
1236                 msleep(1);  /* a little delay here seems better.. */
1237                 if (snd_nm256_ac97_ready(chip)) {
1238                         /* successful write: set cache */
1239                         chip->ac97_regs[idx] = val;
1240                         return;
1241                 }
1242         }
1243         snd_printd("nm256: ac97 codec not ready..\n");
1244 }
1245
1246 /* static resolution table */
1247 static struct snd_ac97_res_table nm256_res_table[] = {
1248         { AC97_MASTER, 0x1f1f },
1249         { AC97_HEADPHONE, 0x1f1f },
1250         { AC97_MASTER_MONO, 0x001f },
1251         { AC97_PC_BEEP, 0x001f },
1252         { AC97_PHONE, 0x001f },
1253         { AC97_MIC, 0x001f },
1254         { AC97_LINE, 0x1f1f },
1255         { AC97_CD, 0x1f1f },
1256         { AC97_VIDEO, 0x1f1f },
1257         { AC97_AUX, 0x1f1f },
1258         { AC97_PCM, 0x1f1f },
1259         { AC97_REC_GAIN, 0x0f0f },
1260         { } /* terminator */
1261 };
1262
1263 /* initialize the ac97 into a known state */
1264 static void
1265 snd_nm256_ac97_reset(struct snd_ac97 *ac97)
1266 {
1267         struct nm256 *chip = ac97->private_data;
1268
1269         /* Reset the mixer.  'Tis magic!  */
1270         snd_nm256_writeb(chip, 0x6c0, 1);
1271         if (! chip->reset_workaround) {
1272                 /* Dell latitude LS will lock up by this */
1273                 snd_nm256_writeb(chip, 0x6cc, 0x87);
1274         }
1275         if (! chip->reset_workaround_2) {
1276                 /* Dell latitude CSx will lock up by this */
1277                 snd_nm256_writeb(chip, 0x6cc, 0x80);
1278                 snd_nm256_writeb(chip, 0x6cc, 0x0);
1279         }
1280         if (! chip->in_resume) {
1281                 int i;
1282                 for (i = 0; i < ARRAY_SIZE(nm256_ac97_init_val); i++) {
1283                         /* preload the cache, so as to avoid even a single
1284                          * read of the mixer regs
1285                          */
1286                         snd_nm256_ac97_write(ac97, nm256_ac97_init_val[i].reg,
1287                                              nm256_ac97_init_val[i].value);
1288                 }
1289         }
1290 }
1291
1292 /* create an ac97 mixer interface */
1293 static int __devinit
1294 snd_nm256_mixer(struct nm256 *chip)
1295 {
1296         struct snd_ac97_bus *pbus;
1297         struct snd_ac97_template ac97;
1298         int err;
1299         static struct snd_ac97_bus_ops ops = {
1300                 .reset = snd_nm256_ac97_reset,
1301                 .write = snd_nm256_ac97_write,
1302                 .read = snd_nm256_ac97_read,
1303         };
1304
1305         chip->ac97_regs = kcalloc(sizeof(short),
1306                                   ARRAY_SIZE(nm256_ac97_init_val), GFP_KERNEL);
1307         if (! chip->ac97_regs)
1308                 return -ENOMEM;
1309
1310         if ((err = snd_ac97_bus(chip->card, 0, &ops, NULL, &pbus)) < 0)
1311                 return err;
1312
1313         memset(&ac97, 0, sizeof(ac97));
1314         ac97.scaps = AC97_SCAP_AUDIO; /* we support audio! */
1315         ac97.private_data = chip;
1316         ac97.res_table = nm256_res_table;
1317         pbus->no_vra = 1;
1318         err = snd_ac97_mixer(pbus, &ac97, &chip->ac97);
1319         if (err < 0)
1320                 return err;
1321         if (! (chip->ac97->id & (0xf0000000))) {
1322                 /* looks like an invalid id */
1323                 sprintf(chip->card->mixername, "%s AC97", chip->card->driver);
1324         }
1325         return 0;
1326 }
1327
1328 /*
1329  * See if the signature left by the NM256 BIOS is intact; if so, we use
1330  * the associated address as the end of our audio buffer in the video
1331  * RAM.
1332  */
1333
1334 static int __devinit
1335 snd_nm256_peek_for_sig(struct nm256 *chip)
1336 {
1337         /* The signature is located 1K below the end of video RAM.  */
1338         void __iomem *temp;
1339         /* Default buffer end is 5120 bytes below the top of RAM.  */
1340         unsigned long pointer_found = chip->buffer_end - 0x1400;
1341         u32 sig;
1342
1343         temp = ioremap_nocache(chip->buffer_addr + chip->buffer_end - 0x400, 16);
1344         if (temp == NULL) {
1345                 snd_printk(KERN_ERR "Unable to scan for card signature in video RAM\n");
1346                 return -EBUSY;
1347         }
1348
1349         sig = readl(temp);
1350         if ((sig & NM_SIG_MASK) == NM_SIGNATURE) {
1351                 u32 pointer = readl(temp + 4);
1352
1353                 /*
1354                  * If it's obviously invalid, don't use it
1355                  */
1356                 if (pointer == 0xffffffff ||
1357                     pointer < chip->buffer_size ||
1358                     pointer > chip->buffer_end) {
1359                         snd_printk(KERN_ERR "invalid signature found: 0x%x\n", pointer);
1360                         iounmap(temp);
1361                         return -ENODEV;
1362                 } else {
1363                         pointer_found = pointer;
1364                         printk(KERN_INFO "nm256: found card signature in video RAM: 0x%x\n",
1365                                pointer);
1366                 }
1367         }
1368
1369         iounmap(temp);
1370         chip->buffer_end = pointer_found;
1371
1372         return 0;
1373 }
1374
1375 #ifdef CONFIG_PM
1376 /*
1377  * APM event handler, so the card is properly reinitialized after a power
1378  * event.
1379  */
1380 static int nm256_suspend(struct pci_dev *pci, pm_message_t state)
1381 {
1382         struct snd_card *card = pci_get_drvdata(pci);
1383         struct nm256 *chip = card->private_data;
1384
1385         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1386         snd_pcm_suspend_all(chip->pcm);
1387         snd_ac97_suspend(chip->ac97);
1388         chip->coeffs_current = 0;
1389         pci_disable_device(pci);
1390         pci_save_state(pci);
1391         pci_set_power_state(pci, pci_choose_state(pci, state));
1392         return 0;
1393 }
1394
1395 static int nm256_resume(struct pci_dev *pci)
1396 {
1397         struct snd_card *card = pci_get_drvdata(pci);
1398         struct nm256 *chip = card->private_data;
1399         int i;
1400
1401         /* Perform a full reset on the hardware */
1402         chip->in_resume = 1;
1403
1404         pci_set_power_state(pci, PCI_D0);
1405         pci_restore_state(pci);
1406         if (pci_enable_device(pci) < 0) {
1407                 printk(KERN_ERR "nm256: pci_enable_device failed, "
1408                        "disabling device\n");
1409                 snd_card_disconnect(card);
1410                 return -EIO;
1411         }
1412         pci_set_master(pci);
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 #endif /* CONFIG_PM */
1433
1434 static int snd_nm256_free(struct nm256 *chip)
1435 {
1436         if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
1437                 snd_nm256_playback_stop(chip);
1438         if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
1439                 snd_nm256_capture_stop(chip);
1440
1441         if (chip->irq >= 0)
1442                 free_irq(chip->irq, chip);
1443
1444         if (chip->cport)
1445                 iounmap(chip->cport);
1446         if (chip->buffer)
1447                 iounmap(chip->buffer);
1448         release_and_free_resource(chip->res_cport);
1449         release_and_free_resource(chip->res_buffer);
1450
1451         pci_disable_device(chip->pci);
1452         kfree(chip->ac97_regs);
1453         kfree(chip);
1454         return 0;
1455 }
1456
1457 static int snd_nm256_dev_free(struct snd_device *device)
1458 {
1459         struct nm256 *chip = device->device_data;
1460         return snd_nm256_free(chip);
1461 }
1462
1463 static int __devinit
1464 snd_nm256_create(struct snd_card *card, struct pci_dev *pci,
1465                  struct nm256 **chip_ret)
1466 {
1467         struct nm256 *chip;
1468         int err, pval;
1469         static struct snd_device_ops ops = {
1470                 .dev_free =     snd_nm256_dev_free,
1471         };
1472         u32 addr;
1473
1474         *chip_ret = NULL;
1475
1476         if ((err = pci_enable_device(pci)) < 0)
1477                 return err;
1478
1479         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1480         if (chip == NULL) {
1481                 pci_disable_device(pci);
1482                 return -ENOMEM;
1483         }
1484
1485         chip->card = card;
1486         chip->pci = pci;
1487         chip->use_cache = use_cache;
1488         spin_lock_init(&chip->reg_lock);
1489         chip->irq = -1;
1490         mutex_init(&chip->irq_mutex);
1491
1492         /* store buffer sizes in bytes */
1493         chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize = playback_bufsize * 1024;
1494         chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize = capture_bufsize * 1024;
1495
1496         /*
1497          * The NM256 has two memory ports.  The first port is nothing
1498          * more than a chunk of video RAM, which is used as the I/O ring
1499          * buffer.  The second port has the actual juicy stuff (like the
1500          * mixer and the playback engine control registers).
1501          */
1502
1503         chip->buffer_addr = pci_resource_start(pci, 0);
1504         chip->cport_addr = pci_resource_start(pci, 1);
1505
1506         /* Init the memory port info.  */
1507         /* remap control port (#2) */
1508         chip->res_cport = request_mem_region(chip->cport_addr, NM_PORT2_SIZE,
1509                                              card->driver);
1510         if (chip->res_cport == NULL) {
1511                 snd_printk(KERN_ERR "memory region 0x%lx (size 0x%x) busy\n",
1512                            chip->cport_addr, NM_PORT2_SIZE);
1513                 err = -EBUSY;
1514                 goto __error;
1515         }
1516         chip->cport = ioremap_nocache(chip->cport_addr, NM_PORT2_SIZE);
1517         if (chip->cport == NULL) {
1518                 snd_printk(KERN_ERR "unable to map control port %lx\n", chip->cport_addr);
1519                 err = -ENOMEM;
1520                 goto __error;
1521         }
1522
1523         if (!strcmp(card->driver, "NM256AV")) {
1524                 /* Ok, try to see if this is a non-AC97 version of the hardware. */
1525                 pval = snd_nm256_readw(chip, NM_MIXER_PRESENCE);
1526                 if ((pval & NM_PRESENCE_MASK) != NM_PRESENCE_VALUE) {
1527                         if (! force_ac97) {
1528                                 printk(KERN_ERR "nm256: no ac97 is found!\n");
1529                                 printk(KERN_ERR "  force the driver to load by "
1530                                        "passing in the module parameter\n");
1531                                 printk(KERN_ERR "    force_ac97=1\n");
1532                                 printk(KERN_ERR "  or try sb16, opl3sa2, or "
1533                                        "cs423x drivers instead.\n");
1534                                 err = -ENXIO;
1535                                 goto __error;
1536                         }
1537                 }
1538                 chip->buffer_end = 2560 * 1024;
1539                 chip->interrupt = snd_nm256_interrupt;
1540                 chip->mixer_status_offset = NM_MIXER_STATUS_OFFSET;
1541                 chip->mixer_status_mask = NM_MIXER_READY_MASK;
1542         } else {
1543                 /* Not sure if there is any relevant detect for the ZX or not.  */
1544                 if (snd_nm256_readb(chip, 0xa0b) != 0)
1545                         chip->buffer_end = 6144 * 1024;
1546                 else
1547                         chip->buffer_end = 4096 * 1024;
1548
1549                 chip->interrupt = snd_nm256_interrupt_zx;
1550                 chip->mixer_status_offset = NM2_MIXER_STATUS_OFFSET;
1551                 chip->mixer_status_mask = NM2_MIXER_READY_MASK;
1552         }
1553
1554         chip->buffer_size = chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize +
1555                 chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
1556         if (chip->use_cache)
1557                 chip->buffer_size += NM_TOTAL_COEFF_COUNT * 4;
1558         else
1559                 chip->buffer_size += NM_MAX_PLAYBACK_COEF_SIZE + NM_MAX_RECORD_COEF_SIZE;
1560
1561         if (buffer_top >= chip->buffer_size && buffer_top < chip->buffer_end)
1562                 chip->buffer_end = buffer_top;
1563         else {
1564                 /* get buffer end pointer from signature */
1565                 if ((err = snd_nm256_peek_for_sig(chip)) < 0)
1566                         goto __error;
1567         }
1568
1569         chip->buffer_start = chip->buffer_end - chip->buffer_size;
1570         chip->buffer_addr += chip->buffer_start;
1571
1572         printk(KERN_INFO "nm256: Mapping port 1 from 0x%x - 0x%x\n",
1573                chip->buffer_start, chip->buffer_end);
1574
1575         chip->res_buffer = request_mem_region(chip->buffer_addr,
1576                                               chip->buffer_size,
1577                                               card->driver);
1578         if (chip->res_buffer == NULL) {
1579                 snd_printk(KERN_ERR "nm256: buffer 0x%lx (size 0x%x) busy\n",
1580                            chip->buffer_addr, chip->buffer_size);
1581                 err = -EBUSY;
1582                 goto __error;
1583         }
1584         chip->buffer = ioremap_nocache(chip->buffer_addr, chip->buffer_size);
1585         if (chip->buffer == NULL) {
1586                 err = -ENOMEM;
1587                 snd_printk(KERN_ERR "unable to map ring buffer at %lx\n", chip->buffer_addr);
1588                 goto __error;
1589         }
1590
1591         /* set offsets */
1592         addr = chip->buffer_start;
1593         chip->streams[SNDRV_PCM_STREAM_PLAYBACK].buf = addr;
1594         addr += chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize;
1595         chip->streams[SNDRV_PCM_STREAM_CAPTURE].buf = addr;
1596         addr += chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
1597         if (chip->use_cache) {
1598                 chip->all_coeff_buf = addr;
1599         } else {
1600                 chip->coeff_buf[SNDRV_PCM_STREAM_PLAYBACK] = addr;
1601                 addr += NM_MAX_PLAYBACK_COEF_SIZE;
1602                 chip->coeff_buf[SNDRV_PCM_STREAM_CAPTURE] = addr;
1603         }
1604
1605         /* Fixed setting. */
1606         chip->mixer_base = NM_MIXER_OFFSET;
1607
1608         chip->coeffs_current = 0;
1609
1610         snd_nm256_init_chip(chip);
1611
1612         // pci_set_master(pci); /* needed? */
1613
1614         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0)
1615                 goto __error;
1616
1617         snd_card_set_dev(card, &pci->dev);
1618
1619         *chip_ret = chip;
1620         return 0;
1621
1622 __error:
1623         snd_nm256_free(chip);
1624         return err;
1625 }
1626
1627
1628 enum { NM_BLACKLISTED, NM_RESET_WORKAROUND, NM_RESET_WORKAROUND_2 };
1629
1630 static struct snd_pci_quirk nm256_quirks[] __devinitdata = {
1631         /* HP omnibook 4150 has cs4232 codec internally */
1632         SND_PCI_QUIRK(0x103c, 0x0007, "HP omnibook 4150", NM_BLACKLISTED),
1633         /* Reset workarounds to avoid lock-ups */
1634         SND_PCI_QUIRK(0x104d, 0x8041, "Sony PCG-F305", NM_RESET_WORKAROUND),
1635         SND_PCI_QUIRK(0x1028, 0x0080, "Dell Latitude LS", NM_RESET_WORKAROUND),
1636         SND_PCI_QUIRK(0x1028, 0x0091, "Dell Latitude CSx", NM_RESET_WORKAROUND_2),
1637         { } /* terminator */
1638 };
1639
1640
1641 static int __devinit snd_nm256_probe(struct pci_dev *pci,
1642                                      const struct pci_device_id *pci_id)
1643 {
1644         struct snd_card *card;
1645         struct nm256 *chip;
1646         int err;
1647         const struct snd_pci_quirk *q;
1648
1649         q = snd_pci_quirk_lookup(pci, nm256_quirks);
1650         if (q) {
1651                 snd_printdd(KERN_INFO "nm256: Enabled quirk for %s.\n", q->name);
1652                 switch (q->value) {
1653                 case NM_BLACKLISTED:
1654                         printk(KERN_INFO "nm256: The device is blacklisted. "
1655                                "Loading stopped\n");
1656                         return -ENODEV;
1657                 case NM_RESET_WORKAROUND_2:
1658                         reset_workaround_2 = 1;
1659                         /* Fall-through */
1660                 case NM_RESET_WORKAROUND:
1661                         reset_workaround = 1;
1662                         break;
1663                 }
1664         }
1665
1666         card = snd_card_new(index, id, THIS_MODULE, 0);
1667         if (card == NULL)
1668                 return -ENOMEM;
1669
1670         switch (pci->device) {
1671         case PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO:
1672                 strcpy(card->driver, "NM256AV");
1673                 break;
1674         case PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO:
1675                 strcpy(card->driver, "NM256ZX");
1676                 break;
1677         case PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO:
1678                 strcpy(card->driver, "NM256XL+");
1679                 break;
1680         default:
1681                 snd_printk(KERN_ERR "invalid device id 0x%x\n", pci->device);
1682                 snd_card_free(card);
1683                 return -EINVAL;
1684         }
1685
1686         if (vaio_hack)
1687                 buffer_top = 0x25a800;  /* this avoids conflicts with XFree86 server */
1688
1689         if (playback_bufsize < 4)
1690                 playback_bufsize = 4;
1691         if (playback_bufsize > 128)
1692                 playback_bufsize = 128;
1693         if (capture_bufsize < 4)
1694                 capture_bufsize = 4;
1695         if (capture_bufsize > 128)
1696                 capture_bufsize = 128;
1697         if ((err = snd_nm256_create(card, pci, &chip)) < 0) {
1698                 snd_card_free(card);
1699                 return err;
1700         }
1701         card->private_data = chip;
1702
1703         if (reset_workaround) {
1704                 snd_printdd(KERN_INFO "nm256: reset_workaround activated\n");
1705                 chip->reset_workaround = 1;
1706         }
1707
1708         if (reset_workaround_2) {
1709                 snd_printdd(KERN_INFO "nm256: reset_workaround_2 activated\n");
1710                 chip->reset_workaround_2 = 1;
1711         }
1712
1713         if ((err = snd_nm256_pcm(chip, 0)) < 0 ||
1714             (err = snd_nm256_mixer(chip)) < 0) {
1715                 snd_card_free(card);
1716                 return err;
1717         }
1718
1719         sprintf(card->shortname, "NeoMagic %s", card->driver);
1720         sprintf(card->longname, "%s at 0x%lx & 0x%lx, irq %d",
1721                 card->shortname,
1722                 chip->buffer_addr, chip->cport_addr, chip->irq);
1723
1724         if ((err = snd_card_register(card)) < 0) {
1725                 snd_card_free(card);
1726                 return err;
1727         }
1728
1729         pci_set_drvdata(pci, card);
1730         return 0;
1731 }
1732
1733 static void __devexit snd_nm256_remove(struct pci_dev *pci)
1734 {
1735         snd_card_free(pci_get_drvdata(pci));
1736         pci_set_drvdata(pci, NULL);
1737 }
1738
1739
1740 static struct pci_driver driver = {
1741         .name = "NeoMagic 256",
1742         .id_table = snd_nm256_ids,
1743         .probe = snd_nm256_probe,
1744         .remove = __devexit_p(snd_nm256_remove),
1745 #ifdef CONFIG_PM
1746         .suspend = nm256_suspend,
1747         .resume = nm256_resume,
1748 #endif
1749 };
1750
1751
1752 static int __init alsa_card_nm256_init(void)
1753 {
1754         return pci_register_driver(&driver);
1755 }
1756
1757 static void __exit alsa_card_nm256_exit(void)
1758 {
1759         pci_unregister_driver(&driver);
1760 }
1761
1762 module_init(alsa_card_nm256_init)
1763 module_exit(alsa_card_nm256_exit)