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   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 <sound/core.h>
  36 #include <sound/info.h>
  37 #include <sound/control.h>
  38 #include <sound/pcm.h>
  39 #include <sound/ac97_codec.h>
  40 #include <sound/initval.h>
  41
  42 #define CARD_NAME "NeoMagic 256AV/ZX"
  43 #define DRIVER_NAME "NM256"
  44
  45 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
  46 MODULE_DESCRIPTION("NeoMagic NM256AV/ZX");
  47 MODULE_LICENSE("GPL");
  48 MODULE_SUPPORTED_DEVICE("{{NeoMagic,NM256AV},"
  49                 "{NeoMagic,NM256ZX}}");
  50
  51 /*
  52  * some compile conditions.
  53  */
  54
  55 static int index = SNDRV_DEFAULT_IDX1;  /* Index */
  56 static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */
  57 static int playback_bufsize = 16;
  58 static int capture_bufsize = 16;
  59 static int force_ac97;                  /* disabled as default */
  60 static int buffer_top;                  /* not specified */
  61 static int use_cache;                   /* disabled */
  62 static int vaio_hack;                   /* disabled */
  63 static int reset_workaround;
  64 static int reset_workaround_2;
  65
  66 module_param(index, int, 0444);
  67 MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
  68 module_param(id, charp, 0444);
  69 MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
  70 module_param(playback_bufsize, int, 0444);
  71 MODULE_PARM_DESC(playback_bufsize, "DAC frame size in kB for " CARD_NAME " soundcard.");
  72 module_param(capture_bufsize, int, 0444);
  73 MODULE_PARM_DESC(capture_bufsize, "ADC frame size in kB for " CARD_NAME " soundcard.");
  74 module_param(force_ac97, bool, 0444);
  75 MODULE_PARM_DESC(force_ac97, "Force to use AC97 codec for " CARD_NAME " soundcard.");
  76 module_param(buffer_top, int, 0444);
  77 MODULE_PARM_DESC(buffer_top, "Set the top address of audio buffer for " CARD_NAME " soundcard.");
  78 module_param(use_cache, bool, 0444);
  79 MODULE_PARM_DESC(use_cache, "Enable the cache for coefficient table access.");
  80 module_param(vaio_hack, bool, 0444);
  81 MODULE_PARM_DESC(vaio_hack, "Enable workaround for Sony VAIO notebooks.");
  82 module_param(reset_workaround, bool, 0444);
  83 MODULE_PARM_DESC(reset_workaround, "Enable AC97 RESET workaround for some laptops.");
  84 module_param(reset_workaround_2, bool, 0444);
  85 MODULE_PARM_DESC(reset_workaround_2, "Enable extended AC97 RESET workaround for some other laptops.");
  86
  87 /* just for backward compatibility */
  88 static int enable;
  89 module_param(enable, bool, 0444);
  90
  91
  92
  93 /*
  94  * hw definitions
  95  */
  96
  97 /* The BIOS signature. */
  98 #define NM_SIGNATURE 0x4e4d0000
  99 /* Signature mask. */
 100 #define NM_SIG_MASK 0xffff0000
 101
 102 /* Size of the second memory area. */
 103 #define NM_PORT2_SIZE 4096
 104
 105 /* The base offset of the mixer in the second memory area. */
 106 #define NM_MIXER_OFFSET 0x600
 107
 108 /* The maximum size of a coefficient entry. */
 109 #define NM_MAX_PLAYBACK_COEF_SIZE       0x5000
 110 #define NM_MAX_RECORD_COEF_SIZE         0x1260
 111
 112 /* The interrupt register. */
 113 #define NM_INT_REG 0xa04
 114 /* And its bits. */
 115 #define NM_PLAYBACK_INT 0x40
 116 #define NM_RECORD_INT 0x100
 117 #define NM_MISC_INT_1 0x4000
 118 #define NM_MISC_INT_2 0x1
 119 #define NM_ACK_INT(chip, X) snd_nm256_writew(chip, NM_INT_REG, (X) << 1)
 120
 121 /* The AV's "mixer ready" status bit and location. */
 122 #define NM_MIXER_STATUS_OFFSET 0xa04
 123 #define NM_MIXER_READY_MASK 0x0800
 124 #define NM_MIXER_PRESENCE 0xa06
 125 #define NM_PRESENCE_MASK 0x0050
 126 #define NM_PRESENCE_VALUE 0x0040
 127
 128 /*
 129  * For the ZX.  It uses the same interrupt register, but it holds 32
 130  * bits instead of 16.
 131  */
 132 #define NM2_PLAYBACK_INT 0x10000
 133 #define NM2_RECORD_INT 0x80000
 134 #define NM2_MISC_INT_1 0x8
 135 #define NM2_MISC_INT_2 0x2
 136 #define NM2_ACK_INT(chip, X) snd_nm256_writel(chip, NM_INT_REG, (X))
 137
 138 /* The ZX's "mixer ready" status bit and location. */
 139 #define NM2_MIXER_STATUS_OFFSET 0xa06
 140 #define NM2_MIXER_READY_MASK 0x0800
 141
 142 /* The playback registers start from here. */
 143 #define NM_PLAYBACK_REG_OFFSET 0x0
 144 /* The record registers start from here. */
 145 #define NM_RECORD_REG_OFFSET 0x200
 146
 147 /* The rate register is located 2 bytes from the start of the register area. */
 148 #define NM_RATE_REG_OFFSET 2
 149
 150 /* Mono/stereo flag, number of bits on playback, and rate mask. */
 151 #define NM_RATE_STEREO 1
 152 #define NM_RATE_BITS_16 2
 153 #define NM_RATE_MASK 0xf0
 154
 155 /* Playback enable register. */
 156 #define NM_PLAYBACK_ENABLE_REG (NM_PLAYBACK_REG_OFFSET + 0x1)
 157 #define NM_PLAYBACK_ENABLE_FLAG 1
 158 #define NM_PLAYBACK_ONESHOT 2
 159 #define NM_PLAYBACK_FREERUN 4
 160
 161 /* Mutes the audio output. */
 162 #define NM_AUDIO_MUTE_REG (NM_PLAYBACK_REG_OFFSET + 0x18)
 163 #define NM_AUDIO_MUTE_LEFT 0x8000
 164 #define NM_AUDIO_MUTE_RIGHT 0x0080
 165
 166 /* Recording enable register. */
 167 #define NM_RECORD_ENABLE_REG (NM_RECORD_REG_OFFSET + 0)
 168 #define NM_RECORD_ENABLE_FLAG 1
 169 #define NM_RECORD_FREERUN 2
 170
 171 /* coefficient buffer pointer */
 172 #define NM_COEFF_START_OFFSET   0x1c
 173 #define NM_COEFF_END_OFFSET     0x20
 174
 175 /* DMA buffer offsets */
 176 #define NM_RBUFFER_START (NM_RECORD_REG_OFFSET + 0x4)
 177 #define NM_RBUFFER_END   (NM_RECORD_REG_OFFSET + 0x10)
 178 #define NM_RBUFFER_WMARK (NM_RECORD_REG_OFFSET + 0xc)
 179 #define NM_RBUFFER_CURRP (NM_RECORD_REG_OFFSET + 0x8)
 180
 181 #define NM_PBUFFER_START (NM_PLAYBACK_REG_OFFSET + 0x4)
 182 #define NM_PBUFFER_END   (NM_PLAYBACK_REG_OFFSET + 0x14)
 183 #define NM_PBUFFER_WMARK (NM_PLAYBACK_REG_OFFSET + 0xc)
 184 #define NM_PBUFFER_CURRP (NM_PLAYBACK_REG_OFFSET + 0x8)
 185
 186 /*
 187  * type definitions
 188  */
 189
 190 typedef struct snd_nm256 nm256_t;
 191 typedef struct snd_nm256_stream nm256_stream_t;
 192
 193 struct snd_nm256_stream {
 194
 195         nm256_t *chip;
 196         snd_pcm_substream_t *substream;
 197         int running;
 198         int suspended;
 199
 200         u32 buf;        /* offset from chip->buffer */
 201         int bufsize;    /* buffer size in bytes */
 202         void __iomem *bufptr;           /* mapped pointer */
 203         unsigned long bufptr_addr;      /* physical address of the mapped pointer */
 204
 205         int dma_size;           /* buffer size of the substream in bytes */
 206         int period_size;        /* period size in bytes */
 207         int periods;            /* # of periods */
 208         int shift;              /* bit shifts */
 209         int cur_period;         /* current period # */
 210
 211 };
 212
 213 struct snd_nm256 {
 214
 215         snd_card_t *card;
 216
 217         void __iomem *cport;            /* control port */
 218         struct resource *res_cport;     /* its resource */
 219         unsigned long cport_addr;       /* physical address */
 220
 221         void __iomem *buffer;           /* buffer */
 222         struct resource *res_buffer;    /* its resource */
 223         unsigned long buffer_addr;      /* buffer phyiscal address */
 224
 225         u32 buffer_start;               /* start offset from pci resource 0 */
 226         u32 buffer_end;                 /* end offset */
 227         u32 buffer_size;                /* total buffer size */
 228
 229         u32 all_coeff_buf;              /* coefficient buffer */
 230         u32 coeff_buf[2];               /* coefficient buffer for each stream */
 231
 232         unsigned int coeffs_current: 1; /* coeff. table is loaded? */
 233         unsigned int use_cache: 1;      /* use one big coef. table */
 234         unsigned int reset_workaround: 1; /* Workaround for some laptops to avoid freeze */
 235         unsigned int reset_workaround_2: 1; /* Extended workaround for some other laptops to avoid freeze */
 236
 237         int mixer_base;                 /* register offset of ac97 mixer */
 238         int mixer_status_offset;        /* offset of mixer status reg. */
 239         int mixer_status_mask;          /* bit mask to test the mixer status */
 240
 241         int irq;
 242         int irq_acks;
 243         irqreturn_t (*interrupt)(int, void *, struct pt_regs *);
 244         int badintrcount;               /* counter to check bogus interrupts */
 245         struct semaphore irq_mutex;
 246
 247         nm256_stream_t streams[2];
 248
 249         ac97_t *ac97;
 250
 251         snd_pcm_t *pcm;
 252
 253         struct pci_dev *pci;
 254
 255         spinlock_t reg_lock;
 256
 257 };
 258
 259
 260 /*
 261  * include coefficient table
 262  */
 263 #include "nm256_coef.c"
 264
 265
 266 /*
 267  * PCI ids
 268  */
 269 static struct pci_device_id snd_nm256_ids[] = {
 270         {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 271         {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 272         {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 273         {0,},
 274 };
 275
 276 MODULE_DEVICE_TABLE(pci, snd_nm256_ids);
 277
 278
 279 /*
 280  * lowlvel stuffs
 281  */
 282
 283 static inline u8
 284 snd_nm256_readb(nm256_t *chip, int offset)
 285 {
 286         return readb(chip->cport + offset);
 287 }
 288
 289 static inline u16
 290 snd_nm256_readw(nm256_t *chip, int offset)
 291 {
 292         return readw(chip->cport + offset);
 293 }
 294
 295 static inline u32
 296 snd_nm256_readl(nm256_t *chip, int offset)
 297 {
 298         return readl(chip->cport + offset);
 299 }
 300
 301 static inline void
 302 snd_nm256_writeb(nm256_t *chip, int offset, u8 val)
 303 {
 304         writeb(val, chip->cport + offset);
 305 }
 306
 307 static inline void
 308 snd_nm256_writew(nm256_t *chip, int offset, u16 val)
 309 {
 310         writew(val, chip->cport + offset);
 311 }
 312
 313 static inline void
 314 snd_nm256_writel(nm256_t *chip, int offset, u32 val)
 315 {
 316         writel(val, chip->cport + offset);
 317 }
 318
 319 static inline void
 320 snd_nm256_write_buffer(nm256_t *chip, void *src, int offset, int size)
 321 {
 322         offset -= chip->buffer_start;
 323 #ifdef CONFIG_SND_DEBUG
 324         if (offset < 0 || offset >= chip->buffer_size) {
 325                 snd_printk(KERN_ERR "write_buffer invalid offset = %d size = %d\n", offset, size);
 326                 return;
 327         }
 328 #endif
 329         memcpy_toio(chip->buffer + offset, src, size);
 330 }
 331
 332 /*
 333  * coefficient handlers -- what a magic!
 334  */
 335
 336 static u16
 337 snd_nm256_get_start_offset(int which)
 338 {
 339         u16 offset = 0;
 340         while (which-- > 0)
 341                 offset += coefficient_sizes[which];
 342         return offset;
 343 }
 344
 345 static void
 346 snd_nm256_load_one_coefficient(nm256_t *chip, int stream, u32 port, int which)
 347 {
 348         u32 coeff_buf = chip->coeff_buf[stream];
 349         u16 offset = snd_nm256_get_start_offset(which);
 350         u16 size = coefficient_sizes[which];
 351
 352         snd_nm256_write_buffer(chip, coefficients + offset, coeff_buf, size);
 353         snd_nm256_writel(chip, port, coeff_buf);
 354         /* ???  Record seems to behave differently than playback.  */
 355         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 356                 size--;
 357         snd_nm256_writel(chip, port + 4, coeff_buf + size);
 358 }
 359
 360 static void
 361 snd_nm256_load_coefficient(nm256_t *chip, int stream, int number)
 362 {
 363         /* The enable register for the specified engine.  */
 364         u32 poffset = (stream == SNDRV_PCM_STREAM_CAPTURE ? NM_RECORD_ENABLE_REG : NM_PLAYBACK_ENABLE_REG);
 365         u32 addr = NM_COEFF_START_OFFSET;
 366
 367         addr += (stream == SNDRV_PCM_STREAM_CAPTURE ? 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 snd_pcm_hw_constraint_list_t 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(nm256_t *chip, nm256_stream_t *s, snd_pcm_substream_t *substream)
 429 {
 430         snd_pcm_runtime_t *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(nm256_t *chip)
 464 {
 465         down(&chip->irq_mutex);
 466         if (chip->irq < 0) {
 467                 if (request_irq(chip->pci->irq, chip->interrupt, SA_INTERRUPT|SA_SHIRQ,
 468                                 chip->card->driver, (void*)chip)) {
 469                         snd_printk(KERN_ERR "unable to grab IRQ %d\n", chip->pci->irq);
 470                         up(&chip->irq_mutex);
 471                         return -EBUSY;
 472                 }
 473                 chip->irq = chip->pci->irq;
 474         }
 475         chip->irq_acks++;
 476         up(&chip->irq_mutex);
 477         return 0;
 478 }
 479
 480 /* release interrupt */
 481 static void snd_nm256_release_irq(nm256_t *chip)
 482 {
 483         down(&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, (void*)chip);
 488                 chip->irq = -1;
 489         }
 490         up(&chip->irq_mutex);
 491 }
 492
 493 /*
 494  * start / stop
 495  */
 496
 497 /* update the watermark (current period) */
 498 static void snd_nm256_pcm_mark(nm256_t *chip, nm256_stream_t *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(nm256_t *chip, nm256_stream_t *s, snd_pcm_substream_t *substream)
 510 {
 511         /* program buffer pointers */
 512         snd_nm256_writel(chip, NM_PBUFFER_START, s->buf);
 513         snd_nm256_writel(chip, NM_PBUFFER_END, s->buf + s->dma_size - (1 << s->shift));
 514         snd_nm256_writel(chip, NM_PBUFFER_CURRP, s->buf);
 515         snd_nm256_playback_mark(chip, s);
 516
 517         /* Enable playback engine and interrupts. */
 518         snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG,
 519                          NM_PLAYBACK_ENABLE_FLAG | NM_PLAYBACK_FREERUN);
 520         /* Enable both channels. */
 521         snd_nm256_writew(chip, NM_AUDIO_MUTE_REG, 0x0);
 522 }
 523
 524 static void
 525 snd_nm256_capture_start(nm256_t *chip, nm256_stream_t *s, snd_pcm_substream_t *substream)
 526 {
 527         /* program buffer pointers */
 528         snd_nm256_writel(chip, NM_RBUFFER_START, s->buf);
 529         snd_nm256_writel(chip, NM_RBUFFER_END, s->buf + s->dma_size);
 530         snd_nm256_writel(chip, NM_RBUFFER_CURRP, s->buf);
 531         snd_nm256_capture_mark(chip, s);
 532
 533         /* Enable playback engine and interrupts. */
 534         snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG,
 535                          NM_RECORD_ENABLE_FLAG | NM_RECORD_FREERUN);
 536 }
 537
 538 /* Stop the play engine. */
 539 static void
 540 snd_nm256_playback_stop(nm256_t *chip)
 541 {
 542         /* Shut off sound from both channels. */
 543         snd_nm256_writew(chip, NM_AUDIO_MUTE_REG,
 544                          NM_AUDIO_MUTE_LEFT | NM_AUDIO_MUTE_RIGHT);
 545         /* Disable play engine. */
 546         snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG, 0);
 547 }
 548
 549 static void
 550 snd_nm256_capture_stop(nm256_t *chip)
 551 {
 552         /* Disable recording engine. */
 553         snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG, 0);
 554 }
 555
 556 static int
 557 snd_nm256_playback_trigger(snd_pcm_substream_t *substream, int cmd)
 558 {
 559         nm256_t *chip = snd_pcm_substream_chip(substream);
 560         nm256_stream_t *s = (nm256_stream_t*)substream->runtime->private_data;
 561         int err = 0;
 562
 563         snd_assert(s != NULL, return -ENXIO);
 564
 565         spin_lock(&chip->reg_lock);
 566         switch (cmd) {
 567         case SNDRV_PCM_TRIGGER_RESUME:
 568                 s->suspended = 0;
 569                 /* fallthru */
 570         case SNDRV_PCM_TRIGGER_START:
 571                 if (! s->running) {
 572                         snd_nm256_playback_start(chip, s, substream);
 573                         s->running = 1;
 574                 }
 575                 break;
 576         case SNDRV_PCM_TRIGGER_SUSPEND:
 577                 s->suspended = 1;
 578                 /* fallthru */
 579         case SNDRV_PCM_TRIGGER_STOP:
 580                 if (s->running) {
 581                         snd_nm256_playback_stop(chip);
 582                         s->running = 0;
 583                 }
 584                 break;
 585         default:
 586                 err = -EINVAL;
 587                 break;
 588         }
 589         spin_unlock(&chip->reg_lock);
 590         return err;
 591 }
 592
 593 static int
 594 snd_nm256_capture_trigger(snd_pcm_substream_t *substream, int cmd)
 595 {
 596         nm256_t *chip = snd_pcm_substream_chip(substream);
 597         nm256_stream_t *s = (nm256_stream_t*)substream->runtime->private_data;
 598         int err = 0;
 599
 600         snd_assert(s != NULL, return -ENXIO);
 601
 602         spin_lock(&chip->reg_lock);
 603         switch (cmd) {
 604         case SNDRV_PCM_TRIGGER_START:
 605         case SNDRV_PCM_TRIGGER_RESUME:
 606                 if (! s->running) {
 607                         snd_nm256_capture_start(chip, s, substream);
 608                         s->running = 1;
 609                 }
 610                 break;
 611         case SNDRV_PCM_TRIGGER_STOP:
 612         case SNDRV_PCM_TRIGGER_SUSPEND:
 613                 if (s->running) {
 614                         snd_nm256_capture_stop(chip);
 615                         s->running = 0;
 616                 }
 617                 break;
 618         default:
 619                 err = -EINVAL;
 620                 break;
 621         }
 622         spin_unlock(&chip->reg_lock);
 623         return err;
 624 }
 625
 626
 627 /*
 628  * prepare playback/capture channel
 629  */
 630 static int snd_nm256_pcm_prepare(snd_pcm_substream_t *substream)
 631 {
 632         nm256_t *chip = snd_pcm_substream_chip(substream);
 633         snd_pcm_runtime_t *runtime = substream->runtime;
 634         nm256_stream_t *s = (nm256_stream_t*)runtime->private_data;
 635
 636         snd_assert(s, return -ENXIO);
 637         s->dma_size = frames_to_bytes(runtime, substream->runtime->buffer_size);
 638         s->period_size = frames_to_bytes(runtime, substream->runtime->period_size);
 639         s->periods = substream->runtime->periods;
 640         s->cur_period = 0;
 641
 642         spin_lock_irq(&chip->reg_lock);
 643         s->running = 0;
 644         snd_nm256_set_format(chip, s, substream);
 645         spin_unlock_irq(&chip->reg_lock);
 646
 647         return 0;
 648 }
 649
 650
 651 /*
 652  * get the current pointer
 653  */
 654 static snd_pcm_uframes_t
 655 snd_nm256_playback_pointer(snd_pcm_substream_t * substream)
 656 {
 657         nm256_t *chip = snd_pcm_substream_chip(substream);
 658         nm256_stream_t *s = (nm256_stream_t*)substream->runtime->private_data;
 659         unsigned long curp;
 660
 661         snd_assert(s, return 0);
 662         curp = snd_nm256_readl(chip, NM_PBUFFER_CURRP) - (unsigned long)s->buf;
 663         curp %= s->dma_size;
 664         return bytes_to_frames(substream->runtime, curp);
 665 }
 666
 667 static snd_pcm_uframes_t
 668 snd_nm256_capture_pointer(snd_pcm_substream_t * substream)
 669 {
 670         nm256_t *chip = snd_pcm_substream_chip(substream);
 671         nm256_stream_t *s = (nm256_stream_t*)substream->runtime->private_data;
 672         unsigned long curp;
 673
 674         snd_assert(s != NULL, return 0);
 675         curp = snd_nm256_readl(chip, NM_RBUFFER_CURRP) - (unsigned long)s->buf;
 676         curp %= s->dma_size;
 677         return bytes_to_frames(substream->runtime, curp);
 678 }
 679
 680 /* Remapped I/O space can be accessible as pointer on i386 */
 681 /* This might be changed in the future */
 682 #ifndef __i386__
 683 /*
 684  * silence / copy for playback
 685  */
 686 static int
 687 snd_nm256_playback_silence(snd_pcm_substream_t *substream,
 688                            int channel, /* not used (interleaved data) */
 689                            snd_pcm_uframes_t pos,
 690                            snd_pcm_uframes_t count)
 691 {
 692         snd_pcm_runtime_t *runtime = substream->runtime;
 693         nm256_stream_t *s = (nm256_stream_t*)runtime->private_data;
 694         count = frames_to_bytes(runtime, count);
 695         pos = frames_to_bytes(runtime, pos);
 696         memset_io(s->bufptr + pos, 0, count);
 697         return 0;
 698 }
 699
 700 static int
 701 snd_nm256_playback_copy(snd_pcm_substream_t *substream,
 702                         int channel, /* not used (interleaved data) */
 703                         snd_pcm_uframes_t pos,
 704                         void __user *src,
 705                         snd_pcm_uframes_t count)
 706 {
 707         snd_pcm_runtime_t *runtime = substream->runtime;
 708         nm256_stream_t *s = (nm256_stream_t*)runtime->private_data;
 709         count = frames_to_bytes(runtime, count);
 710         pos = frames_to_bytes(runtime, pos);
 711         if (copy_from_user_toio(s->bufptr + pos, src, count))
 712                 return -EFAULT;
 713         return 0;
 714 }
 715
 716 /*
 717  * copy to user
 718  */
 719 static int
 720 snd_nm256_capture_copy(snd_pcm_substream_t *substream,
 721                        int channel, /* not used (interleaved data) */
 722                        snd_pcm_uframes_t pos,
 723                        void __user *dst,
 724                        snd_pcm_uframes_t count)
 725 {
 726         snd_pcm_runtime_t *runtime = substream->runtime;
 727         nm256_stream_t *s = (nm256_stream_t*)runtime->private_data;
 728         count = frames_to_bytes(runtime, count);
 729         pos = frames_to_bytes(runtime, pos);
 730         if (copy_to_user_fromio(dst, s->bufptr + pos, count))
 731                 return -EFAULT;
 732         return 0;
 733 }
 734
 735 #endif /* !__i386__ */
 736
 737
 738 /*
 739  * update playback/capture watermarks
 740  */
 741
 742 /* spinlock held! */
 743 static void
 744 snd_nm256_playback_update(nm256_t *chip)
 745 {
 746         nm256_stream_t *s;
 747
 748         s = &chip->streams[SNDRV_PCM_STREAM_PLAYBACK];
 749         if (s->running && s->substream) {
 750                 spin_unlock(&chip->reg_lock);
 751                 snd_pcm_period_elapsed(s->substream);
 752                 spin_lock(&chip->reg_lock);
 753                 snd_nm256_playback_mark(chip, s);
 754         }
 755 }
 756
 757 /* spinlock held! */
 758 static void
 759 snd_nm256_capture_update(nm256_t *chip)
 760 {
 761         nm256_stream_t *s;
 762
 763         s = &chip->streams[SNDRV_PCM_STREAM_CAPTURE];
 764         if (s->running && s->substream) {
 765                 spin_unlock(&chip->reg_lock);
 766                 snd_pcm_period_elapsed(s->substream);
 767                 spin_lock(&chip->reg_lock);
 768                 snd_nm256_capture_mark(chip, s);
 769         }
 770 }
 771
 772 /*
 773  * hardware info
 774  */
 775 static snd_pcm_hardware_t snd_nm256_playback =
 776 {
 777         .info =                 SNDRV_PCM_INFO_MMAP_IOMEM |SNDRV_PCM_INFO_MMAP_VALID |
 778                                 SNDRV_PCM_INFO_INTERLEAVED |
 779                                 /*SNDRV_PCM_INFO_PAUSE |*/
 780                                 SNDRV_PCM_INFO_RESUME,
 781         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
 782         .rates =                SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
 783         .rate_min =             8000,
 784         .rate_max =             48000,
 785         .channels_min =         1,
 786         .channels_max =         2,
 787         .periods_min =          2,
 788         .periods_max =          1024,
 789         .buffer_bytes_max =     128 * 1024,
 790         .period_bytes_min =     256,
 791         .period_bytes_max =     128 * 1024,
 792 };
 793
 794 static snd_pcm_hardware_t snd_nm256_capture =
 795 {
 796         .info =                 SNDRV_PCM_INFO_MMAP_IOMEM | SNDRV_PCM_INFO_MMAP_VALID |
 797                                 SNDRV_PCM_INFO_INTERLEAVED |
 798                                 /*SNDRV_PCM_INFO_PAUSE |*/
 799                                 SNDRV_PCM_INFO_RESUME,
 800         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
 801         .rates =                SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
 802         .rate_min =             8000,
 803         .rate_max =             48000,
 804         .channels_min =         1,
 805         .channels_max =         2,
 806         .periods_min =          2,
 807         .periods_max =          1024,
 808         .buffer_bytes_max =     128 * 1024,
 809         .period_bytes_min =     256,
 810         .period_bytes_max =     128 * 1024,
 811 };
 812
 813
 814 /* set dma transfer size */
 815 static int snd_nm256_pcm_hw_params(snd_pcm_substream_t *substream, snd_pcm_hw_params_t *hw_params)
 816 {
 817         /* area and addr are already set and unchanged */
 818         substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
 819         return 0;
 820 }
 821
 822 /*
 823  * open
 824  */
 825 static void snd_nm256_setup_stream(nm256_t *chip, nm256_stream_t *s,
 826                                    snd_pcm_substream_t *substream,
 827                                    snd_pcm_hardware_t *hw_ptr)
 828 {
 829         snd_pcm_runtime_t *runtime = substream->runtime;
 830
 831         s->running = 0;
 832         runtime->hw = *hw_ptr;
 833         runtime->hw.buffer_bytes_max = s->bufsize;
 834         runtime->hw.period_bytes_max = s->bufsize / 2;
 835         runtime->dma_area = (void __force *) s->bufptr;
 836         runtime->dma_addr = s->bufptr_addr;
 837         runtime->dma_bytes = s->bufsize;
 838         runtime->private_data = s;
 839         s->substream = substream;
 840
 841         snd_pcm_set_sync(substream);
 842         snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 843                                    &constraints_rates);
 844 }
 845
 846 static int
 847 snd_nm256_playback_open(snd_pcm_substream_t *substream)
 848 {
 849         nm256_t *chip = snd_pcm_substream_chip(substream);
 850
 851         if (snd_nm256_acquire_irq(chip) < 0)
 852                 return -EBUSY;
 853         snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_PLAYBACK],
 854                                substream, &snd_nm256_playback);
 855         return 0;
 856 }
 857
 858 static int
 859 snd_nm256_capture_open(snd_pcm_substream_t *substream)
 860 {
 861         nm256_t *chip = snd_pcm_substream_chip(substream);
 862
 863         if (snd_nm256_acquire_irq(chip) < 0)
 864                 return -EBUSY;
 865         snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_CAPTURE],
 866                                substream, &snd_nm256_capture);
 867         return 0;
 868 }
 869
 870 /*
 871  * close - we don't have to do special..
 872  */
 873 static int
 874 snd_nm256_playback_close(snd_pcm_substream_t *substream)
 875 {
 876         nm256_t *chip = snd_pcm_substream_chip(substream);
 877
 878         snd_nm256_release_irq(chip);
 879         return 0;
 880 }
 881
 882
 883 static int
 884 snd_nm256_capture_close(snd_pcm_substream_t *substream)
 885 {
 886         nm256_t *chip = snd_pcm_substream_chip(substream);
 887
 888         snd_nm256_release_irq(chip);
 889         return 0;
 890 }
 891
 892 /*
 893  * create a pcm instance
 894  */
 895 static snd_pcm_ops_t snd_nm256_playback_ops = {
 896         .open =         snd_nm256_playback_open,
 897         .close =        snd_nm256_playback_close,
 898         .ioctl =        snd_pcm_lib_ioctl,
 899         .hw_params =    snd_nm256_pcm_hw_params,
 900         .prepare =      snd_nm256_pcm_prepare,
 901         .trigger =      snd_nm256_playback_trigger,
 902         .pointer =      snd_nm256_playback_pointer,
 903 #ifndef __i386__
 904         .copy =         snd_nm256_playback_copy,
 905         .silence =      snd_nm256_playback_silence,
 906 #endif
 907         .mmap =         snd_pcm_lib_mmap_iomem,
 908 };
 909
 910 static snd_pcm_ops_t snd_nm256_capture_ops = {
 911         .open =         snd_nm256_capture_open,
 912         .close =        snd_nm256_capture_close,
 913         .ioctl =        snd_pcm_lib_ioctl,
 914         .hw_params =    snd_nm256_pcm_hw_params,
 915         .prepare =      snd_nm256_pcm_prepare,
 916         .trigger =      snd_nm256_capture_trigger,
 917         .pointer =      snd_nm256_capture_pointer,
 918 #ifndef __i386__
 919         .copy =         snd_nm256_capture_copy,
 920 #endif
 921         .mmap =         snd_pcm_lib_mmap_iomem,
 922 };
 923
 924 static int __devinit
 925 snd_nm256_pcm(nm256_t *chip, int device)
 926 {
 927         snd_pcm_t *pcm;
 928         int i, err;
 929
 930         for (i = 0; i < 2; i++) {
 931                 nm256_stream_t *s = &chip->streams[i];
 932                 s->bufptr = chip->buffer + (s->buf - chip->buffer_start);
 933                 s->bufptr_addr = chip->buffer_addr + (s->buf - chip->buffer_start);
 934         }
 935
 936         err = snd_pcm_new(chip->card, chip->card->driver, device,
 937                           1, 1, &pcm);
 938         if (err < 0)
 939                 return err;
 940
 941         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_nm256_playback_ops);
 942         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_nm256_capture_ops);
 943
 944         pcm->private_data = chip;
 945         pcm->info_flags = 0;
 946         chip->pcm = pcm;
 947
 948         return 0;
 949 }
 950
 951
 952 /*
 953  * Initialize the hardware.
 954  */
 955 static void
 956 snd_nm256_init_chip(nm256_t *chip)
 957 {
 958         /* Reset everything. */
 959         snd_nm256_writeb(chip, 0x0, 0x11);
 960         snd_nm256_writew(chip, 0x214, 0);
 961         /* stop sounds.. */
 962         //snd_nm256_playback_stop(chip);
 963         //snd_nm256_capture_stop(chip);
 964 }
 965
 966
 967 static irqreturn_t
 968 snd_nm256_intr_check(nm256_t *chip)
 969 {
 970         if (chip->badintrcount++ > 1000) {
 971                 /*
 972                  * I'm not sure if the best thing is to stop the card from
 973                  * playing or just release the interrupt (after all, we're in
 974                  * a bad situation, so doing fancy stuff may not be such a good
 975                  * idea).
 976                  *
 977                  * I worry about the card engine continuing to play noise
 978                  * over and over, however--that could become a very
 979                  * obnoxious problem.  And we know that when this usually
 980                  * happens things are fairly safe, it just means the user's
 981                  * inserted a PCMCIA card and someone's spamming us with IRQ 9s.
 982                  */
 983                 if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
 984                         snd_nm256_playback_stop(chip);
 985                 if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
 986                         snd_nm256_capture_stop(chip);
 987                 chip->badintrcount = 0;
 988                 return IRQ_HANDLED;
 989         }
 990         return IRQ_NONE;
 991 }
 992
 993 /*
 994  * Handle a potential interrupt for the device referred to by DEV_ID.
 995  *
 996  * I don't like the cut-n-paste job here either between the two routines,
 997  * but there are sufficient differences between the two interrupt handlers
 998  * that parameterizing it isn't all that great either.  (Could use a macro,
 999  * I suppose...yucky bleah.)
1000  */
1001
1002 static irqreturn_t
1003 snd_nm256_interrupt(int irq, void *dev_id, struct pt_regs *dummy)
1004 {
1005         nm256_t *chip = dev_id;
1006         u16 status;
1007         u8 cbyte;
1008
1009         status = snd_nm256_readw(chip, NM_INT_REG);
1010
1011         /* Not ours. */
1012         if (status == 0)
1013                 return snd_nm256_intr_check(chip);
1014
1015         chip->badintrcount = 0;
1016
1017         /* Rather boring; check for individual interrupts and process them. */
1018
1019         spin_lock(&chip->reg_lock);
1020         if (status & NM_PLAYBACK_INT) {
1021                 status &= ~NM_PLAYBACK_INT;
1022                 NM_ACK_INT(chip, NM_PLAYBACK_INT);
1023                 snd_nm256_playback_update(chip);
1024         }
1025
1026         if (status & NM_RECORD_INT) {
1027                 status &= ~NM_RECORD_INT;
1028                 NM_ACK_INT(chip, NM_RECORD_INT);
1029                 snd_nm256_capture_update(chip);
1030         }
1031
1032         if (status & NM_MISC_INT_1) {
1033                 status &= ~NM_MISC_INT_1;
1034                 NM_ACK_INT(chip, NM_MISC_INT_1);
1035                 snd_printd("NM256: Got misc interrupt #1\n");
1036                 snd_nm256_writew(chip, NM_INT_REG, 0x8000);
1037                 cbyte = snd_nm256_readb(chip, 0x400);
1038                 snd_nm256_writeb(chip, 0x400, cbyte | 2);
1039         }
1040
1041         if (status & NM_MISC_INT_2) {
1042                 status &= ~NM_MISC_INT_2;
1043                 NM_ACK_INT(chip, NM_MISC_INT_2);
1044                 snd_printd("NM256: Got misc interrupt #2\n");
1045                 cbyte = snd_nm256_readb(chip, 0x400);
1046                 snd_nm256_writeb(chip, 0x400, cbyte & ~2);
1047         }
1048
1049         /* Unknown interrupt. */
1050         if (status) {
1051                 snd_printd("NM256: Fire in the hole! Unknown status 0x%x\n",
1052                            status);
1053                 /* Pray. */
1054                 NM_ACK_INT(chip, status);
1055         }
1056
1057         spin_unlock(&chip->reg_lock);
1058         return IRQ_HANDLED;
1059 }
1060
1061 /*
1062  * Handle a potential interrupt for the device referred to by DEV_ID.
1063  * This handler is for the 256ZX, and is very similar to the non-ZX
1064  * routine.
1065  */
1066
1067 static irqreturn_t
1068 snd_nm256_interrupt_zx(int irq, void *dev_id, struct pt_regs *dummy)
1069 {
1070         nm256_t *chip = dev_id;
1071         u32 status;
1072         u8 cbyte;
1073
1074         status = snd_nm256_readl(chip, NM_INT_REG);
1075
1076         /* Not ours. */
1077         if (status == 0)
1078                 return snd_nm256_intr_check(chip);
1079
1080         chip->badintrcount = 0;
1081
1082         /* Rather boring; check for individual interrupts and process them. */
1083
1084         spin_lock(&chip->reg_lock);
1085         if (status & NM2_PLAYBACK_INT) {
1086                 status &= ~NM2_PLAYBACK_INT;
1087                 NM2_ACK_INT(chip, NM2_PLAYBACK_INT);
1088                 snd_nm256_playback_update(chip);
1089         }
1090
1091         if (status & NM2_RECORD_INT) {
1092                 status &= ~NM2_RECORD_INT;
1093                 NM2_ACK_INT(chip, NM2_RECORD_INT);
1094                 snd_nm256_capture_update(chip);
1095         }
1096
1097         if (status & NM2_MISC_INT_1) {
1098                 status &= ~NM2_MISC_INT_1;
1099                 NM2_ACK_INT(chip, NM2_MISC_INT_1);
1100                 snd_printd("NM256: Got misc interrupt #1\n");
1101                 cbyte = snd_nm256_readb(chip, 0x400);
1102                 snd_nm256_writeb(chip, 0x400, cbyte | 2);
1103         }
1104
1105         if (status & NM2_MISC_INT_2) {
1106                 status &= ~NM2_MISC_INT_2;
1107                 NM2_ACK_INT(chip, NM2_MISC_INT_2);
1108                 snd_printd("NM256: Got misc interrupt #2\n");
1109                 cbyte = snd_nm256_readb(chip, 0x400);
1110                 snd_nm256_writeb(chip, 0x400, cbyte & ~2);
1111         }
1112
1113         /* Unknown interrupt. */
1114         if (status) {
1115                 snd_printd("NM256: Fire in the hole! Unknown status 0x%x\n",
1116                            status);
1117                 /* Pray. */
1118                 NM2_ACK_INT(chip, status);
1119         }
1120
1121         spin_unlock(&chip->reg_lock);
1122         return IRQ_HANDLED;
1123 }
1124
1125 /*
1126  * AC97 interface
1127  */
1128
1129 /*
1130  * Waits for the mixer to become ready to be written; returns a zero value
1131  * if it timed out.
1132  */
1133 static int
1134 snd_nm256_ac97_ready(nm256_t *chip)
1135 {
1136         int timeout = 10;
1137         u32 testaddr;
1138         u16 testb;
1139
1140         testaddr = chip->mixer_status_offset;
1141         testb = chip->mixer_status_mask;
1142
1143         /*
1144          * Loop around waiting for the mixer to become ready.
1145          */
1146         while (timeout-- > 0) {
1147                 if ((snd_nm256_readw(chip, testaddr) & testb) == 0)
1148                         return 1;
1149                 udelay(100);
1150         }
1151         return 0;
1152 }
1153
1154 /*
1155  */
1156 static unsigned short
1157 snd_nm256_ac97_read(ac97_t *ac97, unsigned short reg)
1158 {
1159         nm256_t *chip = ac97->private_data;
1160         int res;
1161
1162         if (reg >= 128)
1163                 return 0;
1164
1165         if (! snd_nm256_ac97_ready(chip))
1166                 return 0;
1167         res = snd_nm256_readw(chip, chip->mixer_base + reg);
1168         /* Magic delay.  Bleah yucky.  */
1169         msleep(1);
1170         return res;
1171 }
1172
1173 /*
1174  */
1175 static void
1176 snd_nm256_ac97_write(ac97_t *ac97,
1177                      unsigned short reg, unsigned short val)
1178 {
1179         nm256_t *chip = ac97->private_data;
1180         int tries = 2;
1181         u32 base;
1182
1183         base = chip->mixer_base;
1184
1185         snd_nm256_ac97_ready(chip);
1186
1187         /* Wait for the write to take, too. */
1188         while (tries-- > 0) {
1189                 snd_nm256_writew(chip, base + reg, val);
1190                 msleep(1);  /* a little delay here seems better.. */
1191                 if (snd_nm256_ac97_ready(chip))
1192                         return;
1193         }
1194         snd_printd("nm256: ac97 codec not ready..\n");
1195 }
1196
1197 /* initialize the ac97 into a known state */
1198 static void
1199 snd_nm256_ac97_reset(ac97_t *ac97)
1200 {
1201         nm256_t *chip = ac97->private_data;
1202
1203         /* Reset the mixer.  'Tis magic!  */
1204         snd_nm256_writeb(chip, 0x6c0, 1);
1205         if (! chip->reset_workaround) {
1206                 /* Dell latitude LS will lock up by this */
1207                 snd_nm256_writeb(chip, 0x6cc, 0x87);
1208         }
1209         if (! chip->reset_workaround_2) {
1210                 /* Dell latitude CSx will lock up by this */
1211                 snd_nm256_writeb(chip, 0x6cc, 0x80);
1212                 snd_nm256_writeb(chip, 0x6cc, 0x0);
1213         }
1214 }
1215
1216 /* create an ac97 mixer interface */
1217 static int __devinit
1218 snd_nm256_mixer(nm256_t *chip)
1219 {
1220         ac97_bus_t *pbus;
1221         ac97_template_t ac97;
1222         int i, err;
1223         static ac97_bus_ops_t ops = {
1224                 .reset = snd_nm256_ac97_reset,
1225                 .write = snd_nm256_ac97_write,
1226                 .read = snd_nm256_ac97_read,
1227         };
1228         /* looks like nm256 hangs up when unexpected registers are touched... */
1229         static int mixer_regs[] = {
1230                 AC97_MASTER, AC97_HEADPHONE, AC97_MASTER_MONO,
1231                 AC97_PC_BEEP, AC97_PHONE, AC97_MIC, AC97_LINE, AC97_CD,
1232                 AC97_VIDEO, AC97_AUX, AC97_PCM, AC97_REC_SEL,
1233                 AC97_REC_GAIN, AC97_GENERAL_PURPOSE, AC97_3D_CONTROL,
1234                 /*AC97_EXTENDED_ID,*/
1235                 AC97_VENDOR_ID1, AC97_VENDOR_ID2,
1236                 -1
1237         };
1238
1239         if ((err = snd_ac97_bus(chip->card, 0, &ops, NULL, &pbus)) < 0)
1240                 return err;
1241
1242         memset(&ac97, 0, sizeof(ac97));
1243         ac97.scaps = AC97_SCAP_AUDIO; /* we support audio! */
1244         ac97.limited_regs = 1;
1245         for (i = 0; mixer_regs[i] >= 0; i++)
1246                 set_bit(mixer_regs[i], ac97.reg_accessed);
1247         ac97.private_data = chip;
1248         pbus->no_vra = 1;
1249         err = snd_ac97_mixer(pbus, &ac97, &chip->ac97);
1250         if (err < 0)
1251                 return err;
1252         if (! (chip->ac97->id & (0xf0000000))) {
1253                 /* looks like an invalid id */
1254                 sprintf(chip->card->mixername, "%s AC97", chip->card->driver);
1255         }
1256         return 0;
1257 }
1258
1259 /*
1260  * See if the signature left by the NM256 BIOS is intact; if so, we use
1261  * the associated address as the end of our audio buffer in the video
1262  * RAM.
1263  */
1264
1265 static int __devinit
1266 snd_nm256_peek_for_sig(nm256_t *chip)
1267 {
1268         /* The signature is located 1K below the end of video RAM.  */
1269         void __iomem *temp;
1270         /* Default buffer end is 5120 bytes below the top of RAM.  */
1271         unsigned long pointer_found = chip->buffer_end - 0x1400;
1272         u32 sig;
1273
1274         temp = ioremap_nocache(chip->buffer_addr + chip->buffer_end - 0x400, 16);
1275         if (temp == NULL) {
1276                 snd_printk(KERN_ERR "Unable to scan for card signature in video RAM\n");
1277                 return -EBUSY;
1278         }
1279
1280         sig = readl(temp);
1281         if ((sig & NM_SIG_MASK) == NM_SIGNATURE) {
1282                 u32 pointer = readl(temp + 4);
1283
1284                 /*
1285                  * If it's obviously invalid, don't use it
1286                  */
1287                 if (pointer == 0xffffffff ||
1288                     pointer < chip->buffer_size ||
1289                     pointer > chip->buffer_end) {
1290                         snd_printk(KERN_ERR "invalid signature found: 0x%x\n", pointer);
1291                         iounmap(temp);
1292                         return -ENODEV;
1293                 } else {
1294                         pointer_found = pointer;
1295                         printk(KERN_INFO "nm256: found card signature in video RAM: 0x%x\n", pointer);
1296                 }
1297         }
1298
1299         iounmap(temp);
1300         chip->buffer_end = pointer_found;
1301
1302         return 0;
1303 }
1304
1305 #ifdef CONFIG_PM
1306 /*
1307  * APM event handler, so the card is properly reinitialized after a power
1308  * event.
1309  */
1310 static int nm256_suspend(snd_card_t *card, pm_message_t state)
1311 {
1312         nm256_t *chip = card->pm_private_data;
1313
1314         snd_pcm_suspend_all(chip->pcm);
1315         snd_ac97_suspend(chip->ac97);
1316         chip->coeffs_current = 0;
1317         pci_disable_device(chip->pci);
1318         return 0;
1319 }
1320
1321 static int nm256_resume(snd_card_t *card)
1322 {
1323         nm256_t *chip = card->pm_private_data;
1324         int i;
1325
1326         /* Perform a full reset on the hardware */
1327         pci_enable_device(chip->pci);
1328         snd_nm256_init_chip(chip);
1329
1330         /* restore ac97 */
1331         snd_ac97_resume(chip->ac97);
1332
1333         for (i = 0; i < 2; i++) {
1334                 nm256_stream_t *s = &chip->streams[i];
1335                 if (s->substream && s->suspended) {
1336                         spin_lock_irq(&chip->reg_lock);
1337                         snd_nm256_set_format(chip, s, s->substream);
1338                         spin_unlock_irq(&chip->reg_lock);
1339                 }
1340         }
1341
1342         return 0;
1343 }
1344 #endif /* CONFIG_PM */
1345
1346 static int snd_nm256_free(nm256_t *chip)
1347 {
1348         if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
1349                 snd_nm256_playback_stop(chip);
1350         if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
1351                 snd_nm256_capture_stop(chip);
1352
1353         if (chip->irq >= 0)
1354                 synchronize_irq(chip->irq);
1355
1356         if (chip->cport)
1357                 iounmap(chip->cport);
1358         if (chip->buffer)
1359                 iounmap(chip->buffer);
1360         release_and_free_resource(chip->res_cport);
1361         release_and_free_resource(chip->res_buffer);
1362         if (chip->irq >= 0)
1363                 free_irq(chip->irq, (void*)chip);
1364
1365         pci_disable_device(chip->pci);
1366         kfree(chip);
1367         return 0;
1368 }
1369
1370 static int snd_nm256_dev_free(snd_device_t *device)
1371 {
1372         nm256_t *chip = device->device_data;
1373         return snd_nm256_free(chip);
1374 }
1375
1376 static int __devinit
1377 snd_nm256_create(snd_card_t *card, struct pci_dev *pci,
1378                  int play_bufsize, int capt_bufsize,
1379                  int force_load,
1380                  u32 buffertop,
1381                  int usecache,
1382                  nm256_t **chip_ret)
1383 {
1384         nm256_t *chip;
1385         int err, pval;
1386         static snd_device_ops_t ops = {
1387                 .dev_free =     snd_nm256_dev_free,
1388         };
1389         u32 addr;
1390
1391         *chip_ret = NULL;
1392
1393         if ((err = pci_enable_device(pci)) < 0)
1394                 return err;
1395
1396         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1397         if (chip == NULL) {
1398                 pci_disable_device(pci);
1399                 return -ENOMEM;
1400         }
1401
1402         chip->card = card;
1403         chip->pci = pci;
1404         chip->use_cache = usecache;
1405         spin_lock_init(&chip->reg_lock);
1406         chip->irq = -1;
1407         init_MUTEX(&chip->irq_mutex);
1408
1409         chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize = play_bufsize;
1410         chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize = capt_bufsize;
1411
1412         /*
1413          * The NM256 has two memory ports.  The first port is nothing
1414          * more than a chunk of video RAM, which is used as the I/O ring
1415          * buffer.  The second port has the actual juicy stuff (like the
1416          * mixer and the playback engine control registers).
1417          */
1418
1419         chip->buffer_addr = pci_resource_start(pci, 0);
1420         chip->cport_addr = pci_resource_start(pci, 1);
1421
1422         /* Init the memory port info.  */
1423         /* remap control port (#2) */
1424         chip->res_cport = request_mem_region(chip->cport_addr, NM_PORT2_SIZE,
1425                                              card->driver);
1426         if (chip->res_cport == NULL) {
1427                 snd_printk(KERN_ERR "memory region 0x%lx (size 0x%x) busy\n",
1428                            chip->cport_addr, NM_PORT2_SIZE);
1429                 err = -EBUSY;
1430                 goto __error;
1431         }
1432         chip->cport = ioremap_nocache(chip->cport_addr, NM_PORT2_SIZE);
1433         if (chip->cport == NULL) {
1434                 snd_printk(KERN_ERR "unable to map control port %lx\n", chip->cport_addr);
1435                 err = -ENOMEM;
1436                 goto __error;
1437         }
1438
1439         if (!strcmp(card->driver, "NM256AV")) {
1440                 /* Ok, try to see if this is a non-AC97 version of the hardware. */
1441                 pval = snd_nm256_readw(chip, NM_MIXER_PRESENCE);
1442                 if ((pval & NM_PRESENCE_MASK) != NM_PRESENCE_VALUE) {
1443                         if (! force_load) {
1444                                 printk(KERN_ERR "nm256: no ac97 is found!\n");
1445                                 printk(KERN_ERR "  force the driver to load by passing in the module parameter\n");
1446                                 printk(KERN_ERR "    force_ac97=1\n");
1447                                 printk(KERN_ERR "  or try sb16 or cs423x drivers instead.\n");
1448                                 err = -ENXIO;
1449                                 goto __error;
1450                         }
1451                 }
1452                 chip->buffer_end = 2560 * 1024;
1453                 chip->interrupt = snd_nm256_interrupt;
1454                 chip->mixer_status_offset = NM_MIXER_STATUS_OFFSET;
1455                 chip->mixer_status_mask = NM_MIXER_READY_MASK;
1456         } else {
1457                 /* Not sure if there is any relevant detect for the ZX or not.  */
1458                 if (snd_nm256_readb(chip, 0xa0b) != 0)
1459                         chip->buffer_end = 6144 * 1024;
1460                 else
1461                         chip->buffer_end = 4096 * 1024;
1462
1463                 chip->interrupt = snd_nm256_interrupt_zx;
1464                 chip->mixer_status_offset = NM2_MIXER_STATUS_OFFSET;
1465                 chip->mixer_status_mask = NM2_MIXER_READY_MASK;
1466         }
1467
1468         chip->buffer_size = chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize + chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
1469         if (chip->use_cache)
1470                 chip->buffer_size += NM_TOTAL_COEFF_COUNT * 4;
1471         else
1472                 chip->buffer_size += NM_MAX_PLAYBACK_COEF_SIZE + NM_MAX_RECORD_COEF_SIZE;
1473
1474         if (buffertop >= chip->buffer_size && buffertop < chip->buffer_end)
1475                 chip->buffer_end = buffertop;
1476         else {
1477                 /* get buffer end pointer from signature */
1478                 if ((err = snd_nm256_peek_for_sig(chip)) < 0)
1479                         goto __error;
1480         }
1481
1482         chip->buffer_start = chip->buffer_end - chip->buffer_size;
1483         chip->buffer_addr += chip->buffer_start;
1484
1485         printk(KERN_INFO "nm256: Mapping port 1 from 0x%x - 0x%x\n",
1486                chip->buffer_start, chip->buffer_end);
1487
1488         chip->res_buffer = request_mem_region(chip->buffer_addr,
1489                                               chip->buffer_size,
1490                                               card->driver);
1491         if (chip->res_buffer == NULL) {
1492                 snd_printk(KERN_ERR "nm256: buffer 0x%lx (size 0x%x) busy\n",
1493                            chip->buffer_addr, chip->buffer_size);
1494                 err = -EBUSY;
1495                 goto __error;
1496         }
1497         chip->buffer = ioremap_nocache(chip->buffer_addr, chip->buffer_size);
1498         if (chip->buffer == NULL) {
1499                 err = -ENOMEM;
1500                 snd_printk(KERN_ERR "unable to map ring buffer at %lx\n", chip->buffer_addr);
1501                 goto __error;
1502         }
1503
1504         /* set offsets */
1505         addr = chip->buffer_start;
1506         chip->streams[SNDRV_PCM_STREAM_PLAYBACK].buf = addr;
1507         addr += chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize;
1508         chip->streams[SNDRV_PCM_STREAM_CAPTURE].buf = addr;
1509         addr += chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
1510         if (chip->use_cache) {
1511                 chip->all_coeff_buf = addr;
1512         } else {
1513                 chip->coeff_buf[SNDRV_PCM_STREAM_PLAYBACK] = addr;
1514                 addr += NM_MAX_PLAYBACK_COEF_SIZE;
1515                 chip->coeff_buf[SNDRV_PCM_STREAM_CAPTURE] = addr;
1516         }
1517
1518         /* Fixed setting. */
1519         chip->mixer_base = NM_MIXER_OFFSET;
1520
1521         chip->coeffs_current = 0;
1522
1523         snd_nm256_init_chip(chip);
1524
1525         // pci_set_master(pci); /* needed? */
1526
1527         snd_card_set_pm_callback(card, nm256_suspend, nm256_resume, chip);
1528
1529         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0)
1530                 goto __error;
1531
1532         snd_card_set_dev(card, &pci->dev);
1533
1534         *chip_ret = chip;
1535         return 0;
1536
1537 __error:
1538         snd_nm256_free(chip);
1539         return err;
1540 }
1541
1542
1543 struct nm256_quirk {
1544         unsigned short vendor;
1545         unsigned short device;
1546         int type;
1547 };
1548
1549 enum { NM_BLACKLISTED, NM_RESET_WORKAROUND, NM_RESET_WORKAROUND_2 };
1550
1551 static struct nm256_quirk nm256_quirks[] __devinitdata = {
1552         /* HP omnibook 4150 has cs4232 codec internally */
1553         { .vendor = 0x103c, .device = 0x0007, .type = NM_BLACKLISTED },
1554         /* Sony PCG-F305 */
1555         { .vendor = 0x104d, .device = 0x8041, .type = NM_RESET_WORKAROUND },
1556         /* Dell Latitude LS */
1557         { .vendor = 0x1028, .device = 0x0080, .type = NM_RESET_WORKAROUND },
1558         /* Dell Latitude CSx */
1559         { .vendor = 0x1028, .device = 0x0091, .type = NM_RESET_WORKAROUND_2 },
1560         { } /* terminator */
1561 };
1562
1563
1564 static int __devinit snd_nm256_probe(struct pci_dev *pci,
1565                                      const struct pci_device_id *pci_id)
1566 {
1567         snd_card_t *card;
1568         nm256_t *chip;
1569         int err;
1570         unsigned int xbuffer_top;
1571         struct nm256_quirk *q;
1572         u16 subsystem_vendor, subsystem_device;
1573
1574         pci_read_config_word(pci, PCI_SUBSYSTEM_VENDOR_ID, &subsystem_vendor);
1575         pci_read_config_word(pci, PCI_SUBSYSTEM_ID, &subsystem_device);
1576
1577         for (q = nm256_quirks; q->vendor; q++) {
1578                 if (q->vendor == subsystem_vendor && q->device == subsystem_device) {
1579                         switch (q->type) {
1580                         case NM_BLACKLISTED:
1581                                 printk(KERN_INFO "nm256: The device is blacklisted.  Loading stopped\n");
1582                                 return -ENODEV;
1583                         case NM_RESET_WORKAROUND_2:
1584                                 reset_workaround_2 = 1;
1585                                 /* Fall-through */
1586                         case NM_RESET_WORKAROUND:
1587                                 reset_workaround = 1;
1588                                 break;
1589                         }
1590                 }
1591         }
1592
1593         card = snd_card_new(index, id, THIS_MODULE, 0);
1594         if (card == NULL)
1595                 return -ENOMEM;
1596
1597         switch (pci->device) {
1598         case PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO:
1599                 strcpy(card->driver, "NM256AV");
1600                 break;
1601         case PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO:
1602                 strcpy(card->driver, "NM256ZX");
1603                 break;
1604         case PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO:
1605                 strcpy(card->driver, "NM256XL+");
1606                 break;
1607         default:
1608                 snd_printk(KERN_ERR "invalid device id 0x%x\n", pci->device);
1609                 snd_card_free(card);
1610                 return -EINVAL;
1611         }
1612
1613         if (vaio_hack)
1614                 xbuffer_top = 0x25a800; /* this avoids conflicts with XFree86 server */
1615         else
1616                 xbuffer_top = buffer_top;
1617
1618         if (playback_bufsize < 4)
1619                 playback_bufsize = 4;
1620         if (playback_bufsize > 128)
1621                 playback_bufsize = 128;
1622         if (capture_bufsize < 4)
1623                 capture_bufsize = 4;
1624         if (capture_bufsize > 128)
1625                 capture_bufsize = 128;
1626         if ((err = snd_nm256_create(card, pci,
1627                                     playback_bufsize * 1024, /* in bytes */
1628                                     capture_bufsize * 1024,  /* in bytes */
1629                                     force_ac97,
1630                                     xbuffer_top,
1631                                     use_cache,
1632                                     &chip)) < 0) {
1633                 snd_card_free(card);
1634                 return err;
1635         }
1636
1637         if (reset_workaround) {
1638                 snd_printdd(KERN_INFO "nm256: reset_workaround activated\n");
1639                 chip->reset_workaround = 1;
1640         }
1641
1642         if (reset_workaround_2) {
1643                 snd_printdd(KERN_INFO "nm256: reset_workaround_2 activated\n");
1644                 chip->reset_workaround_2 = 1;
1645         }
1646
1647         if ((err = snd_nm256_pcm(chip, 0)) < 0 ||
1648             (err = snd_nm256_mixer(chip)) < 0) {
1649                 snd_card_free(card);
1650                 return err;
1651         }
1652
1653         sprintf(card->shortname, "NeoMagic %s", card->driver);
1654         sprintf(card->longname, "%s at 0x%lx & 0x%lx, irq %d",
1655                 card->shortname,
1656                 chip->buffer_addr, chip->cport_addr, chip->irq);
1657
1658         if ((err = snd_card_register(card)) < 0) {
1659                 snd_card_free(card);
1660                 return err;
1661         }
1662
1663         pci_set_drvdata(pci, card);
1664         return 0;
1665 }
1666
1667 static void __devexit snd_nm256_remove(struct pci_dev *pci)
1668 {
1669         snd_card_free(pci_get_drvdata(pci));
1670         pci_set_drvdata(pci, NULL);
1671 }
1672
1673
1674 static struct pci_driver driver = {
1675         .name = "NeoMagic 256",
1676         .id_table = snd_nm256_ids,
1677         .probe = snd_nm256_probe,
1678         .remove = __devexit_p(snd_nm256_remove),
1679         SND_PCI_PM_CALLBACKS
1680 };
1681
1682
1683 static int __init alsa_card_nm256_init(void)
1684 {
1685         return pci_register_driver(&driver);
1686 }
1687
1688 static void __exit alsa_card_nm256_exit(void)
1689 {
1690         pci_unregister_driver(&driver);
1691 }
1692
1693 module_init(alsa_card_nm256_init)
1694 module_exit(alsa_card_nm256_exit)