sound/pci/nm256/nm256.c

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This source file includes following definitions.
snd_nm256_readb
snd_nm256_readw
snd_nm256_readl
snd_nm256_writeb
snd_nm256_writew
snd_nm256_writel
snd_nm256_write_buffer
snd_nm256_get_start_offset
snd_nm256_load_one_coefficient
snd_nm256_load_coefficient
snd_nm256_fixed_rate
snd_nm256_set_format
snd_nm256_acquire_irq
snd_nm256_release_irq
snd_nm256_pcm_mark
snd_nm256_playback_start
snd_nm256_capture_start
snd_nm256_playback_stop
snd_nm256_capture_stop
snd_nm256_playback_trigger
snd_nm256_capture_trigger
snd_nm256_pcm_prepare
snd_nm256_playback_pointer
snd_nm256_capture_pointer
snd_nm256_playback_silence
snd_nm256_playback_copy
snd_nm256_playback_copy_kernel
snd_nm256_capture_copy
snd_nm256_capture_copy_kernel
snd_nm256_playback_update
snd_nm256_capture_update
snd_nm256_pcm_hw_params
snd_nm256_setup_stream
snd_nm256_playback_open
snd_nm256_capture_open
snd_nm256_playback_close
snd_nm256_capture_close
snd_nm256_pcm
snd_nm256_init_chip
snd_nm256_intr_check
snd_nm256_interrupt
snd_nm256_interrupt_zx
snd_nm256_ac97_ready
nm256_ac97_idx
snd_nm256_ac97_read
snd_nm256_ac97_write
snd_nm256_ac97_reset
snd_nm256_mixer
snd_nm256_peek_for_sig
nm256_suspend
nm256_resume
snd_nm256_free
snd_nm256_dev_free
snd_nm256_create
snd_nm256_probe
snd_nm256_remove
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* 
   3  * Driver for NeoMagic 256AV and 256ZX chipsets.
   4  * Copyright (c) 2000 by Takashi Iwai <tiwai@suse.de>
   5  *
   6  * Based on nm256_audio.c OSS driver in linux kernel.
   7  * The original author of OSS nm256 driver wishes to remain anonymous,
   8  * so I just put my acknoledgment to him/her here.
   9  * The original author's web page is found at
  10  *      http://www.uglx.org/sony.html
  11  */
  12   
  13 #include <linux/io.h>
  14 #include <linux/delay.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/init.h>
  17 #include <linux/pci.h>
  18 #include <linux/slab.h>
  19 #include <linux/module.h>
  20 #include <linux/mutex.h>
  21 
  22 #include <sound/core.h>
  23 #include <sound/info.h>
  24 #include <sound/control.h>
  25 #include <sound/pcm.h>
  26 #include <sound/ac97_codec.h>
  27 #include <sound/initval.h>
  28 
  29 #define CARD_NAME "NeoMagic 256AV/ZX"
  30 #define DRIVER_NAME "NM256"
  31 
  32 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
  33 MODULE_DESCRIPTION("NeoMagic NM256AV/ZX");
  34 MODULE_LICENSE("GPL");
  35 MODULE_SUPPORTED_DEVICE("{{NeoMagic,NM256AV},"
  36                 "{NeoMagic,NM256ZX}}");
  37 
  38 /*
  39  * some compile conditions.
  40  */
  41 
  42 static int index = SNDRV_DEFAULT_IDX1;  /* Index */
  43 static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */
  44 static int playback_bufsize = 16;
  45 static int capture_bufsize = 16;
  46 static bool force_ac97;                 /* disabled as default */
  47 static int buffer_top;                  /* not specified */
  48 static bool use_cache;                  /* disabled */
  49 static bool vaio_hack;                  /* disabled */
  50 static bool reset_workaround;
  51 static bool reset_workaround_2;
  52 
  53 module_param(index, int, 0444);
  54 MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
  55 module_param(id, charp, 0444);
  56 MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
  57 module_param(playback_bufsize, int, 0444);
  58 MODULE_PARM_DESC(playback_bufsize, "DAC frame size in kB for " CARD_NAME " soundcard.");
  59 module_param(capture_bufsize, int, 0444);
  60 MODULE_PARM_DESC(capture_bufsize, "ADC frame size in kB for " CARD_NAME " soundcard.");
  61 module_param(force_ac97, bool, 0444);
  62 MODULE_PARM_DESC(force_ac97, "Force to use AC97 codec for " CARD_NAME " soundcard.");
  63 module_param(buffer_top, int, 0444);
  64 MODULE_PARM_DESC(buffer_top, "Set the top address of audio buffer for " CARD_NAME " soundcard.");
  65 module_param(use_cache, bool, 0444);
  66 MODULE_PARM_DESC(use_cache, "Enable the cache for coefficient table access.");
  67 module_param(vaio_hack, bool, 0444);
  68 MODULE_PARM_DESC(vaio_hack, "Enable workaround for Sony VAIO notebooks.");
  69 module_param(reset_workaround, bool, 0444);
  70 MODULE_PARM_DESC(reset_workaround, "Enable AC97 RESET workaround for some laptops.");
  71 module_param(reset_workaround_2, bool, 0444);
  72 MODULE_PARM_DESC(reset_workaround_2, "Enable extended AC97 RESET workaround for some other laptops.");
  73 
  74 /* just for backward compatibility */
  75 static bool enable;
  76 module_param(enable, bool, 0444);
  77 
  78 
  79 
  80 /*
  81  * hw definitions
  82  */
  83 
  84 /* The BIOS signature. */
  85 #define NM_SIGNATURE 0x4e4d0000
  86 /* Signature mask. */
  87 #define NM_SIG_MASK 0xffff0000
  88 
  89 /* Size of the second memory area. */
  90 #define NM_PORT2_SIZE 4096
  91 
  92 /* The base offset of the mixer in the second memory area. */
  93 #define NM_MIXER_OFFSET 0x600
  94 
  95 /* The maximum size of a coefficient entry. */
  96 #define NM_MAX_PLAYBACK_COEF_SIZE       0x5000
  97 #define NM_MAX_RECORD_COEF_SIZE         0x1260
  98 
  99 /* The interrupt register. */
 100 #define NM_INT_REG 0xa04
 101 /* And its bits. */
 102 #define NM_PLAYBACK_INT 0x40
 103 #define NM_RECORD_INT 0x100
 104 #define NM_MISC_INT_1 0x4000
 105 #define NM_MISC_INT_2 0x1
 106 #define NM_ACK_INT(chip, X) snd_nm256_writew(chip, NM_INT_REG, (X) << 1)
 107 
 108 /* The AV's "mixer ready" status bit and location. */
 109 #define NM_MIXER_STATUS_OFFSET 0xa04
 110 #define NM_MIXER_READY_MASK 0x0800
 111 #define NM_MIXER_PRESENCE 0xa06
 112 #define NM_PRESENCE_MASK 0x0050
 113 #define NM_PRESENCE_VALUE 0x0040
 114 
 115 /*
 116  * For the ZX.  It uses the same interrupt register, but it holds 32
 117  * bits instead of 16.
 118  */
 119 #define NM2_PLAYBACK_INT 0x10000
 120 #define NM2_RECORD_INT 0x80000
 121 #define NM2_MISC_INT_1 0x8
 122 #define NM2_MISC_INT_2 0x2
 123 #define NM2_ACK_INT(chip, X) snd_nm256_writel(chip, NM_INT_REG, (X))
 124 
 125 /* The ZX's "mixer ready" status bit and location. */
 126 #define NM2_MIXER_STATUS_OFFSET 0xa06
 127 #define NM2_MIXER_READY_MASK 0x0800
 128 
 129 /* The playback registers start from here. */
 130 #define NM_PLAYBACK_REG_OFFSET 0x0
 131 /* The record registers start from here. */
 132 #define NM_RECORD_REG_OFFSET 0x200
 133 
 134 /* The rate register is located 2 bytes from the start of the register area. */
 135 #define NM_RATE_REG_OFFSET 2
 136 
 137 /* Mono/stereo flag, number of bits on playback, and rate mask. */
 138 #define NM_RATE_STEREO 1
 139 #define NM_RATE_BITS_16 2
 140 #define NM_RATE_MASK 0xf0
 141 
 142 /* Playback enable register. */
 143 #define NM_PLAYBACK_ENABLE_REG (NM_PLAYBACK_REG_OFFSET + 0x1)
 144 #define NM_PLAYBACK_ENABLE_FLAG 1
 145 #define NM_PLAYBACK_ONESHOT 2
 146 #define NM_PLAYBACK_FREERUN 4
 147 
 148 /* Mutes the audio output. */
 149 #define NM_AUDIO_MUTE_REG (NM_PLAYBACK_REG_OFFSET + 0x18)
 150 #define NM_AUDIO_MUTE_LEFT 0x8000
 151 #define NM_AUDIO_MUTE_RIGHT 0x0080
 152 
 153 /* Recording enable register. */
 154 #define NM_RECORD_ENABLE_REG (NM_RECORD_REG_OFFSET + 0)
 155 #define NM_RECORD_ENABLE_FLAG 1
 156 #define NM_RECORD_FREERUN 2
 157 
 158 /* coefficient buffer pointer */
 159 #define NM_COEFF_START_OFFSET   0x1c
 160 #define NM_COEFF_END_OFFSET     0x20
 161 
 162 /* DMA buffer offsets */
 163 #define NM_RBUFFER_START (NM_RECORD_REG_OFFSET + 0x4)
 164 #define NM_RBUFFER_END   (NM_RECORD_REG_OFFSET + 0x10)
 165 #define NM_RBUFFER_WMARK (NM_RECORD_REG_OFFSET + 0xc)
 166 #define NM_RBUFFER_CURRP (NM_RECORD_REG_OFFSET + 0x8)
 167 
 168 #define NM_PBUFFER_START (NM_PLAYBACK_REG_OFFSET + 0x4)
 169 #define NM_PBUFFER_END   (NM_PLAYBACK_REG_OFFSET + 0x14)
 170 #define NM_PBUFFER_WMARK (NM_PLAYBACK_REG_OFFSET + 0xc)
 171 #define NM_PBUFFER_CURRP (NM_PLAYBACK_REG_OFFSET + 0x8)
 172 
 173 struct nm256_stream {
 174 
 175         struct nm256 *chip;
 176         struct snd_pcm_substream *substream;
 177         int running;
 178         int suspended;
 179         
 180         u32 buf;        /* offset from chip->buffer */
 181         int bufsize;    /* buffer size in bytes */
 182         void __iomem *bufptr;           /* mapped pointer */
 183         unsigned long bufptr_addr;      /* physical address of the mapped pointer */
 184 
 185         int dma_size;           /* buffer size of the substream in bytes */
 186         int period_size;        /* period size in bytes */
 187         int periods;            /* # of periods */
 188         int shift;              /* bit shifts */
 189         int cur_period;         /* current period # */
 190 
 191 };
 192 
 193 struct nm256 {
 194         
 195         struct snd_card *card;
 196 
 197         void __iomem *cport;            /* control port */
 198         struct resource *res_cport;     /* its resource */
 199         unsigned long cport_addr;       /* physical address */
 200 
 201         void __iomem *buffer;           /* buffer */
 202         struct resource *res_buffer;    /* its resource */
 203         unsigned long buffer_addr;      /* buffer phyiscal address */
 204 
 205         u32 buffer_start;               /* start offset from pci resource 0 */
 206         u32 buffer_end;                 /* end offset */
 207         u32 buffer_size;                /* total buffer size */
 208 
 209         u32 all_coeff_buf;              /* coefficient buffer */
 210         u32 coeff_buf[2];               /* coefficient buffer for each stream */
 211 
 212         unsigned int coeffs_current: 1; /* coeff. table is loaded? */
 213         unsigned int use_cache: 1;      /* use one big coef. table */
 214         unsigned int reset_workaround: 1; /* Workaround for some laptops to avoid freeze */
 215         unsigned int reset_workaround_2: 1; /* Extended workaround for some other laptops to avoid freeze */
 216         unsigned int in_resume: 1;
 217 
 218         int mixer_base;                 /* register offset of ac97 mixer */
 219         int mixer_status_offset;        /* offset of mixer status reg. */
 220         int mixer_status_mask;          /* bit mask to test the mixer status */
 221 
 222         int irq;
 223         int irq_acks;
 224         irq_handler_t interrupt;
 225         int badintrcount;               /* counter to check bogus interrupts */
 226         struct mutex irq_mutex;
 227 
 228         struct nm256_stream streams[2];
 229 
 230         struct snd_ac97 *ac97;
 231         unsigned short *ac97_regs; /* register caches, only for valid regs */
 232 
 233         struct snd_pcm *pcm;
 234 
 235         struct pci_dev *pci;
 236 
 237         spinlock_t reg_lock;
 238 
 239 };
 240 
 241 
 242 /*
 243  * include coefficient table
 244  */
 245 #include "nm256_coef.c"
 246 
 247 
 248 /*
 249  * PCI ids
 250  */
 251 static const struct pci_device_id snd_nm256_ids[] = {
 252         {PCI_VDEVICE(NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO), 0},
 253         {PCI_VDEVICE(NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO), 0},
 254         {PCI_VDEVICE(NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO), 0},
 255         {0,},
 256 };
 257 
 258 MODULE_DEVICE_TABLE(pci, snd_nm256_ids);
 259 
 260 
 261 /*
 262  * lowlvel stuffs
 263  */
 264 
 265 static inline u8
 266 snd_nm256_readb(struct nm256 *chip, int offset)
 267 {
 268         return readb(chip->cport + offset);
 269 }
 270 
 271 static inline u16
 272 snd_nm256_readw(struct nm256 *chip, int offset)
 273 {
 274         return readw(chip->cport + offset);
 275 }
 276 
 277 static inline u32
 278 snd_nm256_readl(struct nm256 *chip, int offset)
 279 {
 280         return readl(chip->cport + offset);
 281 }
 282 
 283 static inline void
 284 snd_nm256_writeb(struct nm256 *chip, int offset, u8 val)
 285 {
 286         writeb(val, chip->cport + offset);
 287 }
 288 
 289 static inline void
 290 snd_nm256_writew(struct nm256 *chip, int offset, u16 val)
 291 {
 292         writew(val, chip->cport + offset);
 293 }
 294 
 295 static inline void
 296 snd_nm256_writel(struct nm256 *chip, int offset, u32 val)
 297 {
 298         writel(val, chip->cport + offset);
 299 }
 300 
 301 static inline void
 302 snd_nm256_write_buffer(struct nm256 *chip, void *src, int offset, int size)
 303 {
 304         offset -= chip->buffer_start;
 305 #ifdef CONFIG_SND_DEBUG
 306         if (offset < 0 || offset >= chip->buffer_size) {
 307                 dev_err(chip->card->dev,
 308                         "write_buffer invalid offset = %d size = %d\n",
 309                            offset, size);
 310                 return;
 311         }
 312 #endif
 313         memcpy_toio(chip->buffer + offset, src, size);
 314 }
 315 
 316 /*
 317  * coefficient handlers -- what a magic!
 318  */
 319 
 320 static u16
 321 snd_nm256_get_start_offset(int which)
 322 {
 323         u16 offset = 0;
 324         while (which-- > 0)
 325                 offset += coefficient_sizes[which];
 326         return offset;
 327 }
 328 
 329 static void
 330 snd_nm256_load_one_coefficient(struct nm256 *chip, int stream, u32 port, int which)
 331 {
 332         u32 coeff_buf = chip->coeff_buf[stream];
 333         u16 offset = snd_nm256_get_start_offset(which);
 334         u16 size = coefficient_sizes[which];
 335 
 336         snd_nm256_write_buffer(chip, coefficients + offset, coeff_buf, size);
 337         snd_nm256_writel(chip, port, coeff_buf);
 338         /* ???  Record seems to behave differently than playback.  */
 339         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 340                 size--;
 341         snd_nm256_writel(chip, port + 4, coeff_buf + size);
 342 }
 343 
 344 static void
 345 snd_nm256_load_coefficient(struct nm256 *chip, int stream, int number)
 346 {
 347         /* The enable register for the specified engine.  */
 348         u32 poffset = (stream == SNDRV_PCM_STREAM_CAPTURE ?
 349                        NM_RECORD_ENABLE_REG : NM_PLAYBACK_ENABLE_REG);
 350         u32 addr = NM_COEFF_START_OFFSET;
 351 
 352         addr += (stream == SNDRV_PCM_STREAM_CAPTURE ?
 353                  NM_RECORD_REG_OFFSET : NM_PLAYBACK_REG_OFFSET);
 354 
 355         if (snd_nm256_readb(chip, poffset) & 1) {
 356                 dev_dbg(chip->card->dev,
 357                         "NM256: Engine was enabled while loading coefficients!\n");
 358                 return;
 359         }
 360 
 361         /* The recording engine uses coefficient values 8-15.  */
 362         number &= 7;
 363         if (stream == SNDRV_PCM_STREAM_CAPTURE)
 364                 number += 8;
 365 
 366         if (! chip->use_cache) {
 367                 snd_nm256_load_one_coefficient(chip, stream, addr, number);
 368                 return;
 369         }
 370         if (! chip->coeffs_current) {
 371                 snd_nm256_write_buffer(chip, coefficients, chip->all_coeff_buf,
 372                                        NM_TOTAL_COEFF_COUNT * 4);
 373                 chip->coeffs_current = 1;
 374         } else {
 375                 u32 base = chip->all_coeff_buf;
 376                 u32 offset = snd_nm256_get_start_offset(number);
 377                 u32 end_offset = offset + coefficient_sizes[number];
 378                 snd_nm256_writel(chip, addr, base + offset);
 379                 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 380                         end_offset--;
 381                 snd_nm256_writel(chip, addr + 4, base + end_offset);
 382         }
 383 }
 384 
 385 
 386 /* The actual rates supported by the card. */
 387 static const unsigned int samplerates[8] = {
 388         8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000,
 389 };
 390 static const struct snd_pcm_hw_constraint_list constraints_rates = {
 391         .count = ARRAY_SIZE(samplerates), 
 392         .list = samplerates,
 393         .mask = 0,
 394 };
 395 
 396 /*
 397  * return the index of the target rate
 398  */
 399 static int
 400 snd_nm256_fixed_rate(unsigned int rate)
 401 {
 402         unsigned int i;
 403         for (i = 0; i < ARRAY_SIZE(samplerates); i++) {
 404                 if (rate == samplerates[i])
 405                         return i;
 406         }
 407         snd_BUG();
 408         return 0;
 409 }
 410 
 411 /*
 412  * set sample rate and format
 413  */
 414 static void
 415 snd_nm256_set_format(struct nm256 *chip, struct nm256_stream *s,
 416                      struct snd_pcm_substream *substream)
 417 {
 418         struct snd_pcm_runtime *runtime = substream->runtime;
 419         int rate_index = snd_nm256_fixed_rate(runtime->rate);
 420         unsigned char ratebits = (rate_index << 4) & NM_RATE_MASK;
 421 
 422         s->shift = 0;
 423         if (snd_pcm_format_width(runtime->format) == 16) {
 424                 ratebits |= NM_RATE_BITS_16;
 425                 s->shift++;
 426         }
 427         if (runtime->channels > 1) {
 428                 ratebits |= NM_RATE_STEREO;
 429                 s->shift++;
 430         }
 431 
 432         runtime->rate = samplerates[rate_index];
 433 
 434         switch (substream->stream) {
 435         case SNDRV_PCM_STREAM_PLAYBACK:
 436                 snd_nm256_load_coefficient(chip, 0, rate_index); /* 0 = playback */
 437                 snd_nm256_writeb(chip,
 438                                  NM_PLAYBACK_REG_OFFSET + NM_RATE_REG_OFFSET,
 439                                  ratebits);
 440                 break;
 441         case SNDRV_PCM_STREAM_CAPTURE:
 442                 snd_nm256_load_coefficient(chip, 1, rate_index); /* 1 = record */
 443                 snd_nm256_writeb(chip,
 444                                  NM_RECORD_REG_OFFSET + NM_RATE_REG_OFFSET,
 445                                  ratebits);
 446                 break;
 447         }
 448 }
 449 
 450 /* acquire interrupt */
 451 static int snd_nm256_acquire_irq(struct nm256 *chip)
 452 {
 453         mutex_lock(&chip->irq_mutex);
 454         if (chip->irq < 0) {
 455                 if (request_irq(chip->pci->irq, chip->interrupt, IRQF_SHARED,
 456                                 KBUILD_MODNAME, chip)) {
 457                         dev_err(chip->card->dev,
 458                                 "unable to grab IRQ %d\n", chip->pci->irq);
 459                         mutex_unlock(&chip->irq_mutex);
 460                         return -EBUSY;
 461                 }
 462                 chip->irq = chip->pci->irq;
 463         }
 464         chip->irq_acks++;
 465         mutex_unlock(&chip->irq_mutex);
 466         return 0;
 467 }
 468 
 469 /* release interrupt */
 470 static void snd_nm256_release_irq(struct nm256 *chip)
 471 {
 472         mutex_lock(&chip->irq_mutex);
 473         if (chip->irq_acks > 0)
 474                 chip->irq_acks--;
 475         if (chip->irq_acks == 0 && chip->irq >= 0) {
 476                 free_irq(chip->irq, chip);
 477                 chip->irq = -1;
 478         }
 479         mutex_unlock(&chip->irq_mutex);
 480 }
 481 
 482 /*
 483  * start / stop
 484  */
 485 
 486 /* update the watermark (current period) */
 487 static void snd_nm256_pcm_mark(struct nm256 *chip, struct nm256_stream *s, int reg)
 488 {
 489         s->cur_period++;
 490         s->cur_period %= s->periods;
 491         snd_nm256_writel(chip, reg, s->buf + s->cur_period * s->period_size);
 492 }
 493 
 494 #define snd_nm256_playback_mark(chip, s) snd_nm256_pcm_mark(chip, s, NM_PBUFFER_WMARK)
 495 #define snd_nm256_capture_mark(chip, s)  snd_nm256_pcm_mark(chip, s, NM_RBUFFER_WMARK)
 496 
 497 static void
 498 snd_nm256_playback_start(struct nm256 *chip, struct nm256_stream *s,
 499                          struct snd_pcm_substream *substream)
 500 {
 501         /* program buffer pointers */
 502         snd_nm256_writel(chip, NM_PBUFFER_START, s->buf);
 503         snd_nm256_writel(chip, NM_PBUFFER_END, s->buf + s->dma_size - (1 << s->shift));
 504         snd_nm256_writel(chip, NM_PBUFFER_CURRP, s->buf);
 505         snd_nm256_playback_mark(chip, s);
 506 
 507         /* Enable playback engine and interrupts. */
 508         snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG,
 509                          NM_PLAYBACK_ENABLE_FLAG | NM_PLAYBACK_FREERUN);
 510         /* Enable both channels. */
 511         snd_nm256_writew(chip, NM_AUDIO_MUTE_REG, 0x0);
 512 }
 513 
 514 static void
 515 snd_nm256_capture_start(struct nm256 *chip, struct nm256_stream *s,
 516                         struct snd_pcm_substream *substream)
 517 {
 518         /* program buffer pointers */
 519         snd_nm256_writel(chip, NM_RBUFFER_START, s->buf);
 520         snd_nm256_writel(chip, NM_RBUFFER_END, s->buf + s->dma_size);
 521         snd_nm256_writel(chip, NM_RBUFFER_CURRP, s->buf);
 522         snd_nm256_capture_mark(chip, s);
 523 
 524         /* Enable playback engine and interrupts. */
 525         snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG,
 526                          NM_RECORD_ENABLE_FLAG | NM_RECORD_FREERUN);
 527 }
 528 
 529 /* Stop the play engine. */
 530 static void
 531 snd_nm256_playback_stop(struct nm256 *chip)
 532 {
 533         /* Shut off sound from both channels. */
 534         snd_nm256_writew(chip, NM_AUDIO_MUTE_REG,
 535                          NM_AUDIO_MUTE_LEFT | NM_AUDIO_MUTE_RIGHT);
 536         /* Disable play engine. */
 537         snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG, 0);
 538 }
 539 
 540 static void
 541 snd_nm256_capture_stop(struct nm256 *chip)
 542 {
 543         /* Disable recording engine. */
 544         snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG, 0);
 545 }
 546 
 547 static int
 548 snd_nm256_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 549 {
 550         struct nm256 *chip = snd_pcm_substream_chip(substream);
 551         struct nm256_stream *s = substream->runtime->private_data;
 552         int err = 0;
 553 
 554         if (snd_BUG_ON(!s))
 555                 return -ENXIO;
 556 
 557         spin_lock(&chip->reg_lock);
 558         switch (cmd) {
 559         case SNDRV_PCM_TRIGGER_RESUME:
 560                 s->suspended = 0;
 561                 /* fallthru */
 562         case SNDRV_PCM_TRIGGER_START:
 563                 if (! s->running) {
 564                         snd_nm256_playback_start(chip, s, substream);
 565                         s->running = 1;
 566                 }
 567                 break;
 568         case SNDRV_PCM_TRIGGER_SUSPEND:
 569                 s->suspended = 1;
 570                 /* fallthru */
 571         case SNDRV_PCM_TRIGGER_STOP:
 572                 if (s->running) {
 573                         snd_nm256_playback_stop(chip);
 574                         s->running = 0;
 575                 }
 576                 break;
 577         default:
 578                 err = -EINVAL;
 579                 break;
 580         }
 581         spin_unlock(&chip->reg_lock);
 582         return err;
 583 }
 584 
 585 static int
 586 snd_nm256_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 587 {
 588         struct nm256 *chip = snd_pcm_substream_chip(substream);
 589         struct nm256_stream *s = substream->runtime->private_data;
 590         int err = 0;
 591 
 592         if (snd_BUG_ON(!s))
 593                 return -ENXIO;
 594 
 595         spin_lock(&chip->reg_lock);
 596         switch (cmd) {
 597         case SNDRV_PCM_TRIGGER_START:
 598         case SNDRV_PCM_TRIGGER_RESUME:
 599                 if (! s->running) {
 600                         snd_nm256_capture_start(chip, s, substream);
 601                         s->running = 1;
 602                 }
 603                 break;
 604         case SNDRV_PCM_TRIGGER_STOP:
 605         case SNDRV_PCM_TRIGGER_SUSPEND:
 606                 if (s->running) {
 607                         snd_nm256_capture_stop(chip);
 608                         s->running = 0;
 609                 }
 610                 break;
 611         default:
 612                 err = -EINVAL;
 613                 break;
 614         }
 615         spin_unlock(&chip->reg_lock);
 616         return err;
 617 }
 618 
 619 
 620 /*
 621  * prepare playback/capture channel
 622  */
 623 static int snd_nm256_pcm_prepare(struct snd_pcm_substream *substream)
 624 {
 625         struct nm256 *chip = snd_pcm_substream_chip(substream);
 626         struct snd_pcm_runtime *runtime = substream->runtime;
 627         struct nm256_stream *s = runtime->private_data;
 628 
 629         if (snd_BUG_ON(!s))
 630                 return -ENXIO;
 631         s->dma_size = frames_to_bytes(runtime, substream->runtime->buffer_size);
 632         s->period_size = frames_to_bytes(runtime, substream->runtime->period_size);
 633         s->periods = substream->runtime->periods;
 634         s->cur_period = 0;
 635 
 636         spin_lock_irq(&chip->reg_lock);
 637         s->running = 0;
 638         snd_nm256_set_format(chip, s, substream);
 639         spin_unlock_irq(&chip->reg_lock);
 640 
 641         return 0;
 642 }
 643 
 644 
 645 /*
 646  * get the current pointer
 647  */
 648 static snd_pcm_uframes_t
 649 snd_nm256_playback_pointer(struct snd_pcm_substream *substream)
 650 {
 651         struct nm256 *chip = snd_pcm_substream_chip(substream);
 652         struct nm256_stream *s = substream->runtime->private_data;
 653         unsigned long curp;
 654 
 655         if (snd_BUG_ON(!s))
 656                 return 0;
 657         curp = snd_nm256_readl(chip, NM_PBUFFER_CURRP) - (unsigned long)s->buf;
 658         curp %= s->dma_size;
 659         return bytes_to_frames(substream->runtime, curp);
 660 }
 661 
 662 static snd_pcm_uframes_t
 663 snd_nm256_capture_pointer(struct snd_pcm_substream *substream)
 664 {
 665         struct nm256 *chip = snd_pcm_substream_chip(substream);
 666         struct nm256_stream *s = substream->runtime->private_data;
 667         unsigned long curp;
 668 
 669         if (snd_BUG_ON(!s))
 670                 return 0;
 671         curp = snd_nm256_readl(chip, NM_RBUFFER_CURRP) - (unsigned long)s->buf;
 672         curp %= s->dma_size;    
 673         return bytes_to_frames(substream->runtime, curp);
 674 }
 675 
 676 /* Remapped I/O space can be accessible as pointer on i386 */
 677 /* This might be changed in the future */
 678 #ifndef __i386__
 679 /*
 680  * silence / copy for playback
 681  */
 682 static int
 683 snd_nm256_playback_silence(struct snd_pcm_substream *substream,
 684                            int channel, unsigned long pos, unsigned long count)
 685 {
 686         struct snd_pcm_runtime *runtime = substream->runtime;
 687         struct nm256_stream *s = runtime->private_data;
 688 
 689         memset_io(s->bufptr + pos, 0, count);
 690         return 0;
 691 }
 692 
 693 static int
 694 snd_nm256_playback_copy(struct snd_pcm_substream *substream,
 695                         int channel, unsigned long pos,
 696                         void __user *src, unsigned long count)
 697 {
 698         struct snd_pcm_runtime *runtime = substream->runtime;
 699         struct nm256_stream *s = runtime->private_data;
 700 
 701         if (copy_from_user_toio(s->bufptr + pos, src, count))
 702                 return -EFAULT;
 703         return 0;
 704 }
 705 
 706 static int
 707 snd_nm256_playback_copy_kernel(struct snd_pcm_substream *substream,
 708                                int channel, unsigned long pos,
 709                                void *src, unsigned long count)
 710 {
 711         struct snd_pcm_runtime *runtime = substream->runtime;
 712         struct nm256_stream *s = runtime->private_data;
 713 
 714         memcpy_toio(s->bufptr + pos, src, count);
 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, unsigned long pos,
 724                        void __user *dst, unsigned long count)
 725 {
 726         struct snd_pcm_runtime *runtime = substream->runtime;
 727         struct nm256_stream *s = runtime->private_data;
 728 
 729         if (copy_to_user_fromio(dst, s->bufptr + pos, count))
 730                 return -EFAULT;
 731         return 0;
 732 }
 733 
 734 static int
 735 snd_nm256_capture_copy_kernel(struct snd_pcm_substream *substream,
 736                               int channel, unsigned long pos,
 737                               void *dst, unsigned long count)
 738 {
 739         struct snd_pcm_runtime *runtime = substream->runtime;
 740         struct nm256_stream *s = runtime->private_data;
 741 
 742         memcpy_fromio(dst, s->bufptr + pos, count);
 743         return 0;
 744 }
 745 
 746 #endif /* !__i386__ */
 747 
 748 
 749 /*
 750  * update playback/capture watermarks
 751  */
 752 
 753 /* spinlock held! */
 754 static void
 755 snd_nm256_playback_update(struct nm256 *chip)
 756 {
 757         struct nm256_stream *s;
 758 
 759         s = &chip->streams[SNDRV_PCM_STREAM_PLAYBACK];
 760         if (s->running && s->substream) {
 761                 spin_unlock(&chip->reg_lock);
 762                 snd_pcm_period_elapsed(s->substream);
 763                 spin_lock(&chip->reg_lock);
 764                 snd_nm256_playback_mark(chip, s);
 765         }
 766 }
 767 
 768 /* spinlock held! */
 769 static void
 770 snd_nm256_capture_update(struct nm256 *chip)
 771 {
 772         struct nm256_stream *s;
 773 
 774         s = &chip->streams[SNDRV_PCM_STREAM_CAPTURE];
 775         if (s->running && s->substream) {
 776                 spin_unlock(&chip->reg_lock);
 777                 snd_pcm_period_elapsed(s->substream);
 778                 spin_lock(&chip->reg_lock);
 779                 snd_nm256_capture_mark(chip, s);
 780         }
 781 }
 782 
 783 /*
 784  * hardware info
 785  */
 786 static struct snd_pcm_hardware snd_nm256_playback =
 787 {
 788         .info =                 SNDRV_PCM_INFO_MMAP_IOMEM |SNDRV_PCM_INFO_MMAP_VALID |
 789                                 SNDRV_PCM_INFO_INTERLEAVED |
 790                                 /*SNDRV_PCM_INFO_PAUSE |*/
 791                                 SNDRV_PCM_INFO_RESUME,
 792         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
 793         .rates =                SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
 794         .rate_min =             8000,
 795         .rate_max =             48000,
 796         .channels_min =         1,
 797         .channels_max =         2,
 798         .periods_min =          2,
 799         .periods_max =          1024,
 800         .buffer_bytes_max =     128 * 1024,
 801         .period_bytes_min =     256,
 802         .period_bytes_max =     128 * 1024,
 803 };
 804 
 805 static struct snd_pcm_hardware snd_nm256_capture =
 806 {
 807         .info =                 SNDRV_PCM_INFO_MMAP_IOMEM | SNDRV_PCM_INFO_MMAP_VALID |
 808                                 SNDRV_PCM_INFO_INTERLEAVED |
 809                                 /*SNDRV_PCM_INFO_PAUSE |*/
 810                                 SNDRV_PCM_INFO_RESUME,
 811         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
 812         .rates =                SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
 813         .rate_min =             8000,
 814         .rate_max =             48000,
 815         .channels_min =         1,
 816         .channels_max =         2,
 817         .periods_min =          2,
 818         .periods_max =          1024,
 819         .buffer_bytes_max =     128 * 1024,
 820         .period_bytes_min =     256,
 821         .period_bytes_max =     128 * 1024,
 822 };
 823 
 824 
 825 /* set dma transfer size */
 826 static int snd_nm256_pcm_hw_params(struct snd_pcm_substream *substream,
 827                                    struct snd_pcm_hw_params *hw_params)
 828 {
 829         /* area and addr are already set and unchanged */
 830         substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
 831         return 0;
 832 }
 833 
 834 /*
 835  * open
 836  */
 837 static void snd_nm256_setup_stream(struct nm256 *chip, struct nm256_stream *s,
 838                                    struct snd_pcm_substream *substream,
 839                                    struct snd_pcm_hardware *hw_ptr)
 840 {
 841         struct snd_pcm_runtime *runtime = substream->runtime;
 842 
 843         s->running = 0;
 844         runtime->hw = *hw_ptr;
 845         runtime->hw.buffer_bytes_max = s->bufsize;
 846         runtime->hw.period_bytes_max = s->bufsize / 2;
 847         runtime->dma_area = (void __force *) s->bufptr;
 848         runtime->dma_addr = s->bufptr_addr;
 849         runtime->dma_bytes = s->bufsize;
 850         runtime->private_data = s;
 851         s->substream = substream;
 852 
 853         snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 854                                    &constraints_rates);
 855 }
 856 
 857 static int
 858 snd_nm256_playback_open(struct snd_pcm_substream *substream)
 859 {
 860         struct nm256 *chip = snd_pcm_substream_chip(substream);
 861 
 862         if (snd_nm256_acquire_irq(chip) < 0)
 863                 return -EBUSY;
 864         snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_PLAYBACK],
 865                                substream, &snd_nm256_playback);
 866         return 0;
 867 }
 868 
 869 static int
 870 snd_nm256_capture_open(struct snd_pcm_substream *substream)
 871 {
 872         struct nm256 *chip = snd_pcm_substream_chip(substream);
 873 
 874         if (snd_nm256_acquire_irq(chip) < 0)
 875                 return -EBUSY;
 876         snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_CAPTURE],
 877                                substream, &snd_nm256_capture);
 878         return 0;
 879 }
 880 
 881 /*
 882  * close - we don't have to do special..
 883  */
 884 static int
 885 snd_nm256_playback_close(struct snd_pcm_substream *substream)
 886 {
 887         struct nm256 *chip = snd_pcm_substream_chip(substream);
 888 
 889         snd_nm256_release_irq(chip);
 890         return 0;
 891 }
 892 
 893 
 894 static int
 895 snd_nm256_capture_close(struct snd_pcm_substream *substream)
 896 {
 897         struct nm256 *chip = snd_pcm_substream_chip(substream);
 898 
 899         snd_nm256_release_irq(chip);
 900         return 0;
 901 }
 902 
 903 /*
 904  * create a pcm instance
 905  */
 906 static const struct snd_pcm_ops snd_nm256_playback_ops = {
 907         .open =         snd_nm256_playback_open,
 908         .close =        snd_nm256_playback_close,
 909         .ioctl =        snd_pcm_lib_ioctl,
 910         .hw_params =    snd_nm256_pcm_hw_params,
 911         .prepare =      snd_nm256_pcm_prepare,
 912         .trigger =      snd_nm256_playback_trigger,
 913         .pointer =      snd_nm256_playback_pointer,
 914 #ifndef __i386__
 915         .copy_user =    snd_nm256_playback_copy,
 916         .copy_kernel =  snd_nm256_playback_copy_kernel,
 917         .fill_silence = snd_nm256_playback_silence,
 918 #endif
 919         .mmap =         snd_pcm_lib_mmap_iomem,
 920 };
 921 
 922 static const struct snd_pcm_ops snd_nm256_capture_ops = {
 923         .open =         snd_nm256_capture_open,
 924         .close =        snd_nm256_capture_close,
 925         .ioctl =        snd_pcm_lib_ioctl,
 926         .hw_params =    snd_nm256_pcm_hw_params,
 927         .prepare =      snd_nm256_pcm_prepare,
 928         .trigger =      snd_nm256_capture_trigger,
 929         .pointer =      snd_nm256_capture_pointer,
 930 #ifndef __i386__
 931         .copy_user =    snd_nm256_capture_copy,
 932         .copy_kernel =  snd_nm256_capture_copy_kernel,
 933 #endif
 934         .mmap =         snd_pcm_lib_mmap_iomem,
 935 };
 936 
 937 static int
 938 snd_nm256_pcm(struct nm256 *chip, int device)
 939 {
 940         struct snd_pcm *pcm;
 941         int i, err;
 942 
 943         for (i = 0; i < 2; i++) {
 944                 struct nm256_stream *s = &chip->streams[i];
 945                 s->bufptr = chip->buffer + (s->buf - chip->buffer_start);
 946                 s->bufptr_addr = chip->buffer_addr + (s->buf - chip->buffer_start);
 947         }
 948 
 949         err = snd_pcm_new(chip->card, chip->card->driver, device,
 950                           1, 1, &pcm);
 951         if (err < 0)
 952                 return err;
 953 
 954         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_nm256_playback_ops);
 955         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_nm256_capture_ops);
 956 
 957         pcm->private_data = chip;
 958         pcm->info_flags = 0;
 959         chip->pcm = pcm;
 960 
 961         return 0;
 962 }
 963 
 964 
 965 /* 
 966  * Initialize the hardware. 
 967  */
 968 static void
 969 snd_nm256_init_chip(struct nm256 *chip)
 970 {
 971         /* Reset everything. */
 972         snd_nm256_writeb(chip, 0x0, 0x11);
 973         snd_nm256_writew(chip, 0x214, 0);
 974         /* stop sounds.. */
 975         //snd_nm256_playback_stop(chip);
 976         //snd_nm256_capture_stop(chip);
 977 }
 978 
 979 
 980 static irqreturn_t
 981 snd_nm256_intr_check(struct nm256 *chip)
 982 {
 983         if (chip->badintrcount++ > 1000) {
 984                 /*
 985                  * I'm not sure if the best thing is to stop the card from
 986                  * playing or just release the interrupt (after all, we're in
 987                  * a bad situation, so doing fancy stuff may not be such a good
 988                  * idea).
 989                  *
 990                  * I worry about the card engine continuing to play noise
 991                  * over and over, however--that could become a very
 992                  * obnoxious problem.  And we know that when this usually
 993                  * happens things are fairly safe, it just means the user's
 994                  * inserted a PCMCIA card and someone's spamming us with IRQ 9s.
 995                  */
 996                 if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
 997                         snd_nm256_playback_stop(chip);
 998                 if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
 999                         snd_nm256_capture_stop(chip);
1000                 chip->badintrcount = 0;
1001                 return IRQ_HANDLED;
1002         }
1003         return IRQ_NONE;
1004 }
1005 
1006 /* 
1007  * Handle a potential interrupt for the device referred to by DEV_ID. 
1008  *
1009  * I don't like the cut-n-paste job here either between the two routines,
1010  * but there are sufficient differences between the two interrupt handlers
1011  * that parameterizing it isn't all that great either.  (Could use a macro,
1012  * I suppose...yucky bleah.)
1013  */
1014 
1015 static irqreturn_t
1016 snd_nm256_interrupt(int irq, void *dev_id)
1017 {
1018         struct nm256 *chip = dev_id;
1019         u16 status;
1020         u8 cbyte;
1021 
1022         status = snd_nm256_readw(chip, NM_INT_REG);
1023 
1024         /* Not ours. */
1025         if (status == 0)
1026                 return snd_nm256_intr_check(chip);
1027 
1028         chip->badintrcount = 0;
1029 
1030         /* Rather boring; check for individual interrupts and process them. */
1031 
1032         spin_lock(&chip->reg_lock);
1033         if (status & NM_PLAYBACK_INT) {
1034                 status &= ~NM_PLAYBACK_INT;
1035                 NM_ACK_INT(chip, NM_PLAYBACK_INT);
1036                 snd_nm256_playback_update(chip);
1037         }
1038 
1039         if (status & NM_RECORD_INT) {
1040                 status &= ~NM_RECORD_INT;
1041                 NM_ACK_INT(chip, NM_RECORD_INT);
1042                 snd_nm256_capture_update(chip);
1043         }
1044 
1045         if (status & NM_MISC_INT_1) {
1046                 status &= ~NM_MISC_INT_1;
1047                 NM_ACK_INT(chip, NM_MISC_INT_1);
1048                 dev_dbg(chip->card->dev, "NM256: Got misc interrupt #1\n");
1049                 snd_nm256_writew(chip, NM_INT_REG, 0x8000);
1050                 cbyte = snd_nm256_readb(chip, 0x400);
1051                 snd_nm256_writeb(chip, 0x400, cbyte | 2);
1052         }
1053 
1054         if (status & NM_MISC_INT_2) {
1055                 status &= ~NM_MISC_INT_2;
1056                 NM_ACK_INT(chip, NM_MISC_INT_2);
1057                 dev_dbg(chip->card->dev, "NM256: Got misc interrupt #2\n");
1058                 cbyte = snd_nm256_readb(chip, 0x400);
1059                 snd_nm256_writeb(chip, 0x400, cbyte & ~2);
1060         }
1061 
1062         /* Unknown interrupt. */
1063         if (status) {
1064                 dev_dbg(chip->card->dev,
1065                         "NM256: Fire in the hole! Unknown status 0x%x\n",
1066                            status);
1067                 /* Pray. */
1068                 NM_ACK_INT(chip, status);
1069         }
1070 
1071         spin_unlock(&chip->reg_lock);
1072         return IRQ_HANDLED;
1073 }
1074 
1075 /*
1076  * Handle a potential interrupt for the device referred to by DEV_ID.
1077  * This handler is for the 256ZX, and is very similar to the non-ZX
1078  * routine.
1079  */
1080 
1081 static irqreturn_t
1082 snd_nm256_interrupt_zx(int irq, void *dev_id)
1083 {
1084         struct nm256 *chip = dev_id;
1085         u32 status;
1086         u8 cbyte;
1087 
1088         status = snd_nm256_readl(chip, NM_INT_REG);
1089 
1090         /* Not ours. */
1091         if (status == 0)
1092                 return snd_nm256_intr_check(chip);
1093 
1094         chip->badintrcount = 0;
1095 
1096         /* Rather boring; check for individual interrupts and process them. */
1097 
1098         spin_lock(&chip->reg_lock);
1099         if (status & NM2_PLAYBACK_INT) {
1100                 status &= ~NM2_PLAYBACK_INT;
1101                 NM2_ACK_INT(chip, NM2_PLAYBACK_INT);
1102                 snd_nm256_playback_update(chip);
1103         }
1104 
1105         if (status & NM2_RECORD_INT) {
1106                 status &= ~NM2_RECORD_INT;
1107                 NM2_ACK_INT(chip, NM2_RECORD_INT);
1108                 snd_nm256_capture_update(chip);
1109         }
1110 
1111         if (status & NM2_MISC_INT_1) {
1112                 status &= ~NM2_MISC_INT_1;
1113                 NM2_ACK_INT(chip, NM2_MISC_INT_1);
1114                 dev_dbg(chip->card->dev, "NM256: Got misc interrupt #1\n");
1115                 cbyte = snd_nm256_readb(chip, 0x400);
1116                 snd_nm256_writeb(chip, 0x400, cbyte | 2);
1117         }
1118 
1119         if (status & NM2_MISC_INT_2) {
1120                 status &= ~NM2_MISC_INT_2;
1121                 NM2_ACK_INT(chip, NM2_MISC_INT_2);
1122                 dev_dbg(chip->card->dev, "NM256: Got misc interrupt #2\n");
1123                 cbyte = snd_nm256_readb(chip, 0x400);
1124                 snd_nm256_writeb(chip, 0x400, cbyte & ~2);
1125         }
1126 
1127         /* Unknown interrupt. */
1128         if (status) {
1129                 dev_dbg(chip->card->dev,
1130                         "NM256: Fire in the hole! Unknown status 0x%x\n",
1131                            status);
1132                 /* Pray. */
1133                 NM2_ACK_INT(chip, status);
1134         }
1135 
1136         spin_unlock(&chip->reg_lock);
1137         return IRQ_HANDLED;
1138 }
1139 
1140 /*
1141  * AC97 interface
1142  */
1143 
1144 /*
1145  * Waits for the mixer to become ready to be written; returns a zero value
1146  * if it timed out.
1147  */
1148 static int
1149 snd_nm256_ac97_ready(struct nm256 *chip)
1150 {
1151         int timeout = 10;
1152         u32 testaddr;
1153         u16 testb;
1154 
1155         testaddr = chip->mixer_status_offset;
1156         testb = chip->mixer_status_mask;
1157 
1158         /* 
1159          * Loop around waiting for the mixer to become ready. 
1160          */
1161         while (timeout-- > 0) {
1162                 if ((snd_nm256_readw(chip, testaddr) & testb) == 0)
1163                         return 1;
1164                 udelay(100);
1165         }
1166         return 0;
1167 }
1168 
1169 /* 
1170  * Initial register values to be written to the AC97 mixer.
1171  * While most of these are identical to the reset values, we do this
1172  * so that we have most of the register contents cached--this avoids
1173  * reading from the mixer directly (which seems to be problematic,
1174  * probably due to ignorance).
1175  */
1176 
1177 struct initialValues {
1178         unsigned short reg;
1179         unsigned short value;
1180 };
1181 
1182 static struct initialValues nm256_ac97_init_val[] =
1183 {
1184         { AC97_MASTER,          0x8000 },
1185         { AC97_HEADPHONE,       0x8000 },
1186         { AC97_MASTER_MONO,     0x8000 },
1187         { AC97_PC_BEEP,         0x8000 },
1188         { AC97_PHONE,           0x8008 },
1189         { AC97_MIC,             0x8000 },
1190         { AC97_LINE,            0x8808 },
1191         { AC97_CD,              0x8808 },
1192         { AC97_VIDEO,           0x8808 },
1193         { AC97_AUX,             0x8808 },
1194         { AC97_PCM,             0x8808 },
1195         { AC97_REC_SEL,         0x0000 },
1196         { AC97_REC_GAIN,        0x0B0B },
1197         { AC97_GENERAL_PURPOSE, 0x0000 },
1198         { AC97_3D_CONTROL,      0x8000 }, 
1199         { AC97_VENDOR_ID1,      0x8384 },
1200         { AC97_VENDOR_ID2,      0x7609 },
1201 };
1202 
1203 static int nm256_ac97_idx(unsigned short reg)
1204 {
1205         int i;
1206         for (i = 0; i < ARRAY_SIZE(nm256_ac97_init_val); i++)
1207                 if (nm256_ac97_init_val[i].reg == reg)
1208                         return i;
1209         return -1;
1210 }
1211 
1212 /*
1213  * some nm256 easily crash when reading from mixer registers
1214  * thus we're treating it as a write-only mixer and cache the
1215  * written values
1216  */
1217 static unsigned short
1218 snd_nm256_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
1219 {
1220         struct nm256 *chip = ac97->private_data;
1221         int idx = nm256_ac97_idx(reg);
1222 
1223         if (idx < 0)
1224                 return 0;
1225         return chip->ac97_regs[idx];
1226 }
1227 
1228 /* 
1229  */
1230 static void
1231 snd_nm256_ac97_write(struct snd_ac97 *ac97,
1232                      unsigned short reg, unsigned short val)
1233 {
1234         struct nm256 *chip = ac97->private_data;
1235         int tries = 2;
1236         int idx = nm256_ac97_idx(reg);
1237         u32 base;
1238 
1239         if (idx < 0)
1240                 return;
1241 
1242         base = chip->mixer_base;
1243 
1244         snd_nm256_ac97_ready(chip);
1245 
1246         /* Wait for the write to take, too. */
1247         while (tries-- > 0) {
1248                 snd_nm256_writew(chip, base + reg, val);
1249                 msleep(1);  /* a little delay here seems better.. */
1250                 if (snd_nm256_ac97_ready(chip)) {
1251                         /* successful write: set cache */
1252                         chip->ac97_regs[idx] = val;
1253                         return;
1254                 }
1255         }
1256         dev_dbg(chip->card->dev, "nm256: ac97 codec not ready..\n");
1257 }
1258 
1259 /* static resolution table */
1260 static const struct snd_ac97_res_table nm256_res_table[] = {
1261         { AC97_MASTER, 0x1f1f },
1262         { AC97_HEADPHONE, 0x1f1f },
1263         { AC97_MASTER_MONO, 0x001f },
1264         { AC97_PC_BEEP, 0x001f },
1265         { AC97_PHONE, 0x001f },
1266         { AC97_MIC, 0x001f },
1267         { AC97_LINE, 0x1f1f },
1268         { AC97_CD, 0x1f1f },
1269         { AC97_VIDEO, 0x1f1f },
1270         { AC97_AUX, 0x1f1f },
1271         { AC97_PCM, 0x1f1f },
1272         { AC97_REC_GAIN, 0x0f0f },
1273         { } /* terminator */
1274 };
1275 
1276 /* initialize the ac97 into a known state */
1277 static void
1278 snd_nm256_ac97_reset(struct snd_ac97 *ac97)
1279 {
1280         struct nm256 *chip = ac97->private_data;
1281 
1282         /* Reset the mixer.  'Tis magic!  */
1283         snd_nm256_writeb(chip, 0x6c0, 1);
1284         if (! chip->reset_workaround) {
1285                 /* Dell latitude LS will lock up by this */
1286                 snd_nm256_writeb(chip, 0x6cc, 0x87);
1287         }
1288         if (! chip->reset_workaround_2) {
1289                 /* Dell latitude CSx will lock up by this */
1290                 snd_nm256_writeb(chip, 0x6cc, 0x80);
1291                 snd_nm256_writeb(chip, 0x6cc, 0x0);
1292         }
1293         if (! chip->in_resume) {
1294                 int i;
1295                 for (i = 0; i < ARRAY_SIZE(nm256_ac97_init_val); i++) {
1296                         /* preload the cache, so as to avoid even a single
1297                          * read of the mixer regs
1298                          */
1299                         snd_nm256_ac97_write(ac97, nm256_ac97_init_val[i].reg,
1300                                              nm256_ac97_init_val[i].value);
1301                 }
1302         }
1303 }
1304 
1305 /* create an ac97 mixer interface */
1306 static int
1307 snd_nm256_mixer(struct nm256 *chip)
1308 {
1309         struct snd_ac97_bus *pbus;
1310         struct snd_ac97_template ac97;
1311         int err;
1312         static struct snd_ac97_bus_ops ops = {
1313                 .reset = snd_nm256_ac97_reset,
1314                 .write = snd_nm256_ac97_write,
1315                 .read = snd_nm256_ac97_read,
1316         };
1317 
1318         chip->ac97_regs = kcalloc(ARRAY_SIZE(nm256_ac97_init_val),
1319                                   sizeof(short), GFP_KERNEL);
1320         if (! chip->ac97_regs)
1321                 return -ENOMEM;
1322 
1323         if ((err = snd_ac97_bus(chip->card, 0, &ops, NULL, &pbus)) < 0)
1324                 return err;
1325 
1326         memset(&ac97, 0, sizeof(ac97));
1327         ac97.scaps = AC97_SCAP_AUDIO; /* we support audio! */
1328         ac97.private_data = chip;
1329         ac97.res_table = nm256_res_table;
1330         pbus->no_vra = 1;
1331         err = snd_ac97_mixer(pbus, &ac97, &chip->ac97);
1332         if (err < 0)
1333                 return err;
1334         if (! (chip->ac97->id & (0xf0000000))) {
1335                 /* looks like an invalid id */
1336                 sprintf(chip->card->mixername, "%s AC97", chip->card->driver);
1337         }
1338         return 0;
1339 }
1340 
1341 /* 
1342  * See if the signature left by the NM256 BIOS is intact; if so, we use
1343  * the associated address as the end of our audio buffer in the video
1344  * RAM.
1345  */
1346 
1347 static int
1348 snd_nm256_peek_for_sig(struct nm256 *chip)
1349 {
1350         /* The signature is located 1K below the end of video RAM.  */
1351         void __iomem *temp;
1352         /* Default buffer end is 5120 bytes below the top of RAM.  */
1353         unsigned long pointer_found = chip->buffer_end - 0x1400;
1354         u32 sig;
1355 
1356         temp = ioremap_nocache(chip->buffer_addr + chip->buffer_end - 0x400, 16);
1357         if (temp == NULL) {
1358                 dev_err(chip->card->dev,
1359                         "Unable to scan for card signature in video RAM\n");
1360                 return -EBUSY;
1361         }
1362 
1363         sig = readl(temp);
1364         if ((sig & NM_SIG_MASK) == NM_SIGNATURE) {
1365                 u32 pointer = readl(temp + 4);
1366 
1367                 /*
1368                  * If it's obviously invalid, don't use it
1369                  */
1370                 if (pointer == 0xffffffff ||
1371                     pointer < chip->buffer_size ||
1372                     pointer > chip->buffer_end) {
1373                         dev_err(chip->card->dev,
1374                                 "invalid signature found: 0x%x\n", pointer);
1375                         iounmap(temp);
1376                         return -ENODEV;
1377                 } else {
1378                         pointer_found = pointer;
1379                         dev_info(chip->card->dev,
1380                                  "found card signature in video RAM: 0x%x\n",
1381                                pointer);
1382                 }
1383         }
1384 
1385         iounmap(temp);
1386         chip->buffer_end = pointer_found;
1387 
1388         return 0;
1389 }
1390 
1391 #ifdef CONFIG_PM_SLEEP
1392 /*
1393  * APM event handler, so the card is properly reinitialized after a power
1394  * event.
1395  */
1396 static int nm256_suspend(struct device *dev)
1397 {
1398         struct snd_card *card = dev_get_drvdata(dev);
1399         struct nm256 *chip = card->private_data;
1400 
1401         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1402         snd_ac97_suspend(chip->ac97);
1403         chip->coeffs_current = 0;
1404         return 0;
1405 }
1406 
1407 static int nm256_resume(struct device *dev)
1408 {
1409         struct snd_card *card = dev_get_drvdata(dev);
1410         struct nm256 *chip = card->private_data;
1411         int i;
1412 
1413         /* Perform a full reset on the hardware */
1414         chip->in_resume = 1;
1415 
1416         snd_nm256_init_chip(chip);
1417 
1418         /* restore ac97 */
1419         snd_ac97_resume(chip->ac97);
1420 
1421         for (i = 0; i < 2; i++) {
1422                 struct nm256_stream *s = &chip->streams[i];
1423                 if (s->substream && s->suspended) {
1424                         spin_lock_irq(&chip->reg_lock);
1425                         snd_nm256_set_format(chip, s, s->substream);
1426                         spin_unlock_irq(&chip->reg_lock);
1427                 }
1428         }
1429 
1430         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1431         chip->in_resume = 0;
1432         return 0;
1433 }
1434 
1435 static SIMPLE_DEV_PM_OPS(nm256_pm, nm256_suspend, nm256_resume);
1436 #define NM256_PM_OPS    &nm256_pm
1437 #else
1438 #define NM256_PM_OPS    NULL
1439 #endif /* CONFIG_PM_SLEEP */
1440 
1441 static int snd_nm256_free(struct nm256 *chip)
1442 {
1443         if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
1444                 snd_nm256_playback_stop(chip);
1445         if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
1446                 snd_nm256_capture_stop(chip);
1447 
1448         if (chip->irq >= 0)
1449                 free_irq(chip->irq, chip);
1450 
1451         iounmap(chip->cport);
1452         iounmap(chip->buffer);
1453         release_and_free_resource(chip->res_cport);
1454         release_and_free_resource(chip->res_buffer);
1455 
1456         pci_disable_device(chip->pci);
1457         kfree(chip->ac97_regs);
1458         kfree(chip);
1459         return 0;
1460 }
1461 
1462 static int snd_nm256_dev_free(struct snd_device *device)
1463 {
1464         struct nm256 *chip = device->device_data;
1465         return snd_nm256_free(chip);
1466 }
1467 
1468 static int
1469 snd_nm256_create(struct snd_card *card, struct pci_dev *pci,
1470                  struct nm256 **chip_ret)
1471 {
1472         struct nm256 *chip;
1473         int err, pval;
1474         static struct snd_device_ops ops = {
1475                 .dev_free =     snd_nm256_dev_free,
1476         };
1477         u32 addr;
1478 
1479         *chip_ret = NULL;
1480 
1481         if ((err = pci_enable_device(pci)) < 0)
1482                 return err;
1483 
1484         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1485         if (chip == NULL) {
1486                 pci_disable_device(pci);
1487                 return -ENOMEM;
1488         }
1489 
1490         chip->card = card;
1491         chip->pci = pci;
1492         chip->use_cache = use_cache;
1493         spin_lock_init(&chip->reg_lock);
1494         chip->irq = -1;
1495         mutex_init(&chip->irq_mutex);
1496 
1497         /* store buffer sizes in bytes */
1498         chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize = playback_bufsize * 1024;
1499         chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize = capture_bufsize * 1024;
1500 
1501         /* 
1502          * The NM256 has two memory ports.  The first port is nothing
1503          * more than a chunk of video RAM, which is used as the I/O ring
1504          * buffer.  The second port has the actual juicy stuff (like the
1505          * mixer and the playback engine control registers).
1506          */
1507 
1508         chip->buffer_addr = pci_resource_start(pci, 0);
1509         chip->cport_addr = pci_resource_start(pci, 1);
1510 
1511         /* Init the memory port info.  */
1512         /* remap control port (#2) */
1513         chip->res_cport = request_mem_region(chip->cport_addr, NM_PORT2_SIZE,
1514                                              card->driver);
1515         if (chip->res_cport == NULL) {
1516                 dev_err(card->dev, "memory region 0x%lx (size 0x%x) busy\n",
1517                            chip->cport_addr, NM_PORT2_SIZE);
1518                 err = -EBUSY;
1519                 goto __error;
1520         }
1521         chip->cport = ioremap_nocache(chip->cport_addr, NM_PORT2_SIZE);
1522         if (chip->cport == NULL) {
1523                 dev_err(card->dev, "unable to map control port %lx\n",
1524                         chip->cport_addr);
1525                 err = -ENOMEM;
1526                 goto __error;
1527         }
1528 
1529         if (!strcmp(card->driver, "NM256AV")) {
1530                 /* Ok, try to see if this is a non-AC97 version of the hardware. */
1531                 pval = snd_nm256_readw(chip, NM_MIXER_PRESENCE);
1532                 if ((pval & NM_PRESENCE_MASK) != NM_PRESENCE_VALUE) {
1533                         if (! force_ac97) {
1534                                 dev_err(card->dev,
1535                                         "no ac97 is found!\n");
1536                                 dev_err(card->dev,
1537                                         "force the driver to load by passing in the module parameter\n");
1538                                 dev_err(card->dev,
1539                                         " force_ac97=1\n");
1540                                 dev_err(card->dev,
1541                                         "or try sb16, opl3sa2, or cs423x drivers instead.\n");
1542                                 err = -ENXIO;
1543                                 goto __error;
1544                         }
1545                 }
1546                 chip->buffer_end = 2560 * 1024;
1547                 chip->interrupt = snd_nm256_interrupt;
1548                 chip->mixer_status_offset = NM_MIXER_STATUS_OFFSET;
1549                 chip->mixer_status_mask = NM_MIXER_READY_MASK;
1550         } else {
1551                 /* Not sure if there is any relevant detect for the ZX or not.  */
1552                 if (snd_nm256_readb(chip, 0xa0b) != 0)
1553                         chip->buffer_end = 6144 * 1024;
1554                 else
1555                         chip->buffer_end = 4096 * 1024;
1556 
1557                 chip->interrupt = snd_nm256_interrupt_zx;
1558                 chip->mixer_status_offset = NM2_MIXER_STATUS_OFFSET;
1559                 chip->mixer_status_mask = NM2_MIXER_READY_MASK;
1560         }
1561         
1562         chip->buffer_size = chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize +
1563                 chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
1564         if (chip->use_cache)
1565                 chip->buffer_size += NM_TOTAL_COEFF_COUNT * 4;
1566         else
1567                 chip->buffer_size += NM_MAX_PLAYBACK_COEF_SIZE + NM_MAX_RECORD_COEF_SIZE;
1568 
1569         if (buffer_top >= chip->buffer_size && buffer_top < chip->buffer_end)
1570                 chip->buffer_end = buffer_top;
1571         else {
1572                 /* get buffer end pointer from signature */
1573                 if ((err = snd_nm256_peek_for_sig(chip)) < 0)
1574                         goto __error;
1575         }
1576 
1577         chip->buffer_start = chip->buffer_end - chip->buffer_size;
1578         chip->buffer_addr += chip->buffer_start;
1579 
1580         dev_info(card->dev, "Mapping port 1 from 0x%x - 0x%x\n",
1581                chip->buffer_start, chip->buffer_end);
1582 
1583         chip->res_buffer = request_mem_region(chip->buffer_addr,
1584                                               chip->buffer_size,
1585                                               card->driver);
1586         if (chip->res_buffer == NULL) {
1587                 dev_err(card->dev, "buffer 0x%lx (size 0x%x) busy\n",
1588                            chip->buffer_addr, chip->buffer_size);
1589                 err = -EBUSY;
1590                 goto __error;
1591         }
1592         chip->buffer = ioremap_nocache(chip->buffer_addr, chip->buffer_size);
1593         if (chip->buffer == NULL) {
1594                 err = -ENOMEM;
1595                 dev_err(card->dev, "unable to map ring buffer at %lx\n",
1596                         chip->buffer_addr);
1597                 goto __error;
1598         }
1599 
1600         /* set offsets */
1601         addr = chip->buffer_start;
1602         chip->streams[SNDRV_PCM_STREAM_PLAYBACK].buf = addr;
1603         addr += chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize;
1604         chip->streams[SNDRV_PCM_STREAM_CAPTURE].buf = addr;
1605         addr += chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
1606         if (chip->use_cache) {
1607                 chip->all_coeff_buf = addr;
1608         } else {
1609                 chip->coeff_buf[SNDRV_PCM_STREAM_PLAYBACK] = addr;
1610                 addr += NM_MAX_PLAYBACK_COEF_SIZE;
1611                 chip->coeff_buf[SNDRV_PCM_STREAM_CAPTURE] = addr;
1612         }
1613 
1614         /* Fixed setting. */
1615         chip->mixer_base = NM_MIXER_OFFSET;
1616 
1617         chip->coeffs_current = 0;
1618 
1619         snd_nm256_init_chip(chip);
1620 
1621         // pci_set_master(pci); /* needed? */
1622         
1623         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0)
1624                 goto __error;
1625 
1626         *chip_ret = chip;
1627         return 0;
1628 
1629 __error:
1630         snd_nm256_free(chip);
1631         return err;
1632 }
1633 
1634 
1635 enum { NM_BLACKLISTED, NM_RESET_WORKAROUND, NM_RESET_WORKAROUND_2 };
1636 
1637 static struct snd_pci_quirk nm256_quirks[] = {
1638         /* HP omnibook 4150 has cs4232 codec internally */
1639         SND_PCI_QUIRK(0x103c, 0x0007, "HP omnibook 4150", NM_BLACKLISTED),
1640         /* Reset workarounds to avoid lock-ups */
1641         SND_PCI_QUIRK(0x104d, 0x8041, "Sony PCG-F305", NM_RESET_WORKAROUND),
1642         SND_PCI_QUIRK(0x1028, 0x0080, "Dell Latitude LS", NM_RESET_WORKAROUND),
1643         SND_PCI_QUIRK(0x1028, 0x0091, "Dell Latitude CSx", NM_RESET_WORKAROUND_2),
1644         { } /* terminator */
1645 };
1646 
1647 
1648 static int snd_nm256_probe(struct pci_dev *pci,
1649                            const struct pci_device_id *pci_id)
1650 {
1651         struct snd_card *card;
1652         struct nm256 *chip;
1653         int err;
1654         const struct snd_pci_quirk *q;
1655 
1656         q = snd_pci_quirk_lookup(pci, nm256_quirks);
1657         if (q) {
1658                 dev_dbg(&pci->dev, "Enabled quirk for %s.\n",
1659                             snd_pci_quirk_name(q));
1660                 switch (q->value) {
1661                 case NM_BLACKLISTED:
1662                         dev_info(&pci->dev,
1663                                  "The device is blacklisted. Loading stopped\n");
1664                         return -ENODEV;
1665                 case NM_RESET_WORKAROUND_2:
1666                         reset_workaround_2 = 1;
1667                         /* Fall-through */
1668                 case NM_RESET_WORKAROUND:
1669                         reset_workaround = 1;
1670                         break;
1671                 }
1672         }
1673 
1674         err = snd_card_new(&pci->dev, index, id, THIS_MODULE, 0, &card);
1675         if (err < 0)
1676                 return err;
1677 
1678         switch (pci->device) {
1679         case PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO:
1680                 strcpy(card->driver, "NM256AV");
1681                 break;
1682         case PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO:
1683                 strcpy(card->driver, "NM256ZX");
1684                 break;
1685         case PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO:
1686                 strcpy(card->driver, "NM256XL+");
1687                 break;
1688         default:
1689                 dev_err(&pci->dev, "invalid device id 0x%x\n", pci->device);
1690                 snd_card_free(card);
1691                 return -EINVAL;
1692         }
1693 
1694         if (vaio_hack)
1695                 buffer_top = 0x25a800;  /* this avoids conflicts with XFree86 server */
1696 
1697         if (playback_bufsize < 4)
1698                 playback_bufsize = 4;
1699         if (playback_bufsize > 128)
1700                 playback_bufsize = 128;
1701         if (capture_bufsize < 4)
1702                 capture_bufsize = 4;
1703         if (capture_bufsize > 128)
1704                 capture_bufsize = 128;
1705         if ((err = snd_nm256_create(card, pci, &chip)) < 0) {
1706                 snd_card_free(card);
1707                 return err;
1708         }
1709         card->private_data = chip;
1710 
1711         if (reset_workaround) {
1712                 dev_dbg(&pci->dev, "reset_workaround activated\n");
1713                 chip->reset_workaround = 1;
1714         }
1715 
1716         if (reset_workaround_2) {
1717                 dev_dbg(&pci->dev, "reset_workaround_2 activated\n");
1718                 chip->reset_workaround_2 = 1;
1719         }
1720 
1721         if ((err = snd_nm256_pcm(chip, 0)) < 0 ||
1722             (err = snd_nm256_mixer(chip)) < 0) {
1723                 snd_card_free(card);
1724                 return err;
1725         }
1726 
1727         sprintf(card->shortname, "NeoMagic %s", card->driver);
1728         sprintf(card->longname, "%s at 0x%lx & 0x%lx, irq %d",
1729                 card->shortname,
1730                 chip->buffer_addr, chip->cport_addr, chip->irq);
1731 
1732         if ((err = snd_card_register(card)) < 0) {
1733                 snd_card_free(card);
1734                 return err;
1735         }
1736 
1737         pci_set_drvdata(pci, card);
1738         return 0;
1739 }
1740 
1741 static void snd_nm256_remove(struct pci_dev *pci)
1742 {
1743         snd_card_free(pci_get_drvdata(pci));
1744 }
1745 
1746 
1747 static struct pci_driver nm256_driver = {
1748         .name = KBUILD_MODNAME,
1749         .id_table = snd_nm256_ids,
1750         .probe = snd_nm256_probe,
1751         .remove = snd_nm256_remove,
1752         .driver = {
1753                 .pm = NM256_PM_OPS,
1754         },
1755 };
1756 
1757 module_pci_driver(nm256_driver);
/* [<][>][^][v][top][bottom][index][help] */
root/sound/pci/nm256/nm256.c

DEFINITIONS
