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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_CARDS] = SNDRV_DEFAULT_IDX;      /* Index 0-MAX */
  56 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  57 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
  58 static int playback_bufsize[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 16};
  59 static int capture_bufsize[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 16};
  60 static int force_ac97[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 0}; /* disabled as default */
  61 static int buffer_top[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 0}; /* not specified */
  62 static int use_cache[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 0}; /* disabled */
  63 static int vaio_hack[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 0}; /* disabled */
  64 static int reset_workaround[SNDRV_CARDS];
  65
  66 module_param_array(index, int, NULL, 0444);
  67 MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
  68 module_param_array(id, charp, NULL, 0444);
  69 MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
  70 module_param_array(enable, bool, NULL, 0444);
  71 MODULE_PARM_DESC(enable, "Enable this soundcard.");
  72 module_param_array(playback_bufsize, int, NULL, 0444);
  73 MODULE_PARM_DESC(playback_bufsize, "DAC frame size in kB for " CARD_NAME " soundcard.");
  74 module_param_array(capture_bufsize, int, NULL, 0444);
  75 MODULE_PARM_DESC(capture_bufsize, "ADC frame size in kB for " CARD_NAME " soundcard.");
  76 module_param_array(force_ac97, bool, NULL, 0444);
  77 MODULE_PARM_DESC(force_ac97, "Force to use AC97 codec for " CARD_NAME " soundcard.");
  78 module_param_array(buffer_top, int, NULL, 0444);
  79 MODULE_PARM_DESC(buffer_top, "Set the top address of audio buffer for " CARD_NAME " soundcard.");
  80 module_param_array(use_cache, bool, NULL, 0444);
  81 MODULE_PARM_DESC(use_cache, "Enable the cache for coefficient table access.");
  82 module_param_array(vaio_hack, bool, NULL, 0444);
  83 MODULE_PARM_DESC(vaio_hack, "Enable workaround for Sony VAIO notebooks.");
  84 module_param_array(reset_workaround, bool, NULL, 0444);
  85 MODULE_PARM_DESC(reset_workaround, "Enable AC97 RESET workaround for some laptops.");
  86
  87 /*
  88  * hw definitions
  89  */
  90
  91 /* The BIOS signature. */
  92 #define NM_SIGNATURE 0x4e4d0000
  93 /* Signature mask. */
  94 #define NM_SIG_MASK 0xffff0000
  95
  96 /* Size of the second memory area. */
  97 #define NM_PORT2_SIZE 4096
  98
  99 /* The base offset of the mixer in the second memory area. */
 100 #define NM_MIXER_OFFSET 0x600
 101
 102 /* The maximum size of a coefficient entry. */
 103 #define NM_MAX_PLAYBACK_COEF_SIZE       0x5000
 104 #define NM_MAX_RECORD_COEF_SIZE         0x1260
 105
 106 /* The interrupt register. */
 107 #define NM_INT_REG 0xa04
 108 /* And its bits. */
 109 #define NM_PLAYBACK_INT 0x40
 110 #define NM_RECORD_INT 0x100
 111 #define NM_MISC_INT_1 0x4000
 112 #define NM_MISC_INT_2 0x1
 113 #define NM_ACK_INT(chip, X) snd_nm256_writew(chip, NM_INT_REG, (X) << 1)
 114
 115 /* The AV's "mixer ready" status bit and location. */
 116 #define NM_MIXER_STATUS_OFFSET 0xa04
 117 #define NM_MIXER_READY_MASK 0x0800
 118 #define NM_MIXER_PRESENCE 0xa06
 119 #define NM_PRESENCE_MASK 0x0050
 120 #define NM_PRESENCE_VALUE 0x0040
 121
 122 /*
 123  * For the ZX.  It uses the same interrupt register, but it holds 32
 124  * bits instead of 16.
 125  */
 126 #define NM2_PLAYBACK_INT 0x10000
 127 #define NM2_RECORD_INT 0x80000
 128 #define NM2_MISC_INT_1 0x8
 129 #define NM2_MISC_INT_2 0x2
 130 #define NM2_ACK_INT(chip, X) snd_nm256_writel(chip, NM_INT_REG, (X))
 131
 132 /* The ZX's "mixer ready" status bit and location. */
 133 #define NM2_MIXER_STATUS_OFFSET 0xa06
 134 #define NM2_MIXER_READY_MASK 0x0800
 135
 136 /* The playback registers start from here. */
 137 #define NM_PLAYBACK_REG_OFFSET 0x0
 138 /* The record registers start from here. */
 139 #define NM_RECORD_REG_OFFSET 0x200
 140
 141 /* The rate register is located 2 bytes from the start of the register area. */
 142 #define NM_RATE_REG_OFFSET 2
 143
 144 /* Mono/stereo flag, number of bits on playback, and rate mask. */
 145 #define NM_RATE_STEREO 1
 146 #define NM_RATE_BITS_16 2
 147 #define NM_RATE_MASK 0xf0
 148
 149 /* Playback enable register. */
 150 #define NM_PLAYBACK_ENABLE_REG (NM_PLAYBACK_REG_OFFSET + 0x1)
 151 #define NM_PLAYBACK_ENABLE_FLAG 1
 152 #define NM_PLAYBACK_ONESHOT 2
 153 #define NM_PLAYBACK_FREERUN 4
 154
 155 /* Mutes the audio output. */
 156 #define NM_AUDIO_MUTE_REG (NM_PLAYBACK_REG_OFFSET + 0x18)
 157 #define NM_AUDIO_MUTE_LEFT 0x8000
 158 #define NM_AUDIO_MUTE_RIGHT 0x0080
 159
 160 /* Recording enable register. */
 161 #define NM_RECORD_ENABLE_REG (NM_RECORD_REG_OFFSET + 0)
 162 #define NM_RECORD_ENABLE_FLAG 1
 163 #define NM_RECORD_FREERUN 2
 164
 165 /* coefficient buffer pointer */
 166 #define NM_COEFF_START_OFFSET   0x1c
 167 #define NM_COEFF_END_OFFSET     0x20
 168
 169 /* DMA buffer offsets */
 170 #define NM_RBUFFER_START (NM_RECORD_REG_OFFSET + 0x4)
 171 #define NM_RBUFFER_END   (NM_RECORD_REG_OFFSET + 0x10)
 172 #define NM_RBUFFER_WMARK (NM_RECORD_REG_OFFSET + 0xc)
 173 #define NM_RBUFFER_CURRP (NM_RECORD_REG_OFFSET + 0x8)
 174
 175 #define NM_PBUFFER_START (NM_PLAYBACK_REG_OFFSET + 0x4)
 176 #define NM_PBUFFER_END   (NM_PLAYBACK_REG_OFFSET + 0x14)
 177 #define NM_PBUFFER_WMARK (NM_PLAYBACK_REG_OFFSET + 0xc)
 178 #define NM_PBUFFER_CURRP (NM_PLAYBACK_REG_OFFSET + 0x8)
 179
 180 /*
 181  * type definitions
 182  */
 183
 184 typedef struct snd_nm256 nm256_t;
 185 typedef struct snd_nm256_stream nm256_stream_t;
 186
 187 struct snd_nm256_stream {
 188
 189         nm256_t *chip;
 190         snd_pcm_substream_t *substream;
 191         int running;
 192         int suspended;
 193
 194         u32 buf;        /* offset from chip->buffer */
 195         int bufsize;    /* buffer size in bytes */
 196         void __iomem *bufptr;           /* mapped pointer */
 197         unsigned long bufptr_addr;      /* physical address of the mapped pointer */
 198
 199         int dma_size;           /* buffer size of the substream in bytes */
 200         int period_size;        /* period size in bytes */
 201         int periods;            /* # of periods */
 202         int shift;              /* bit shifts */
 203         int cur_period;         /* current period # */
 204
 205 };
 206
 207 struct snd_nm256 {
 208
 209         snd_card_t *card;
 210
 211         void __iomem *cport;            /* control port */
 212         struct resource *res_cport;     /* its resource */
 213         unsigned long cport_addr;       /* physical address */
 214
 215         void __iomem *buffer;           /* buffer */
 216         struct resource *res_buffer;    /* its resource */
 217         unsigned long buffer_addr;      /* buffer phyiscal address */
 218
 219         u32 buffer_start;               /* start offset from pci resource 0 */
 220         u32 buffer_end;                 /* end offset */
 221         u32 buffer_size;                /* total buffer size */
 222
 223         u32 all_coeff_buf;              /* coefficient buffer */
 224         u32 coeff_buf[2];               /* coefficient buffer for each stream */
 225
 226         unsigned int coeffs_current: 1; /* coeff. table is loaded? */
 227         unsigned int use_cache: 1;      /* use one big coef. table */
 228         unsigned int reset_workaround: 1; /* Workaround for some laptops to avoid freeze */
 229
 230         int mixer_base;                 /* register offset of ac97 mixer */
 231         int mixer_status_offset;        /* offset of mixer status reg. */
 232         int mixer_status_mask;          /* bit mask to test the mixer status */
 233
 234         int irq;
 235         int irq_acks;
 236         irqreturn_t (*interrupt)(int, void *, struct pt_regs *);
 237         int badintrcount;               /* counter to check bogus interrupts */
 238         struct semaphore irq_mutex;
 239
 240         nm256_stream_t streams[2];
 241
 242         ac97_t *ac97;
 243
 244         snd_pcm_t *pcm;
 245
 246         struct pci_dev *pci;
 247
 248         spinlock_t reg_lock;
 249
 250 };
 251
 252
 253 /*
 254  * include coefficient table
 255  */
 256 #include "nm256_coef.c"
 257
 258
 259 /*
 260  * PCI ids
 261  */
 262
 263 #ifndef PCI_VENDOR_ID_NEOMAGIC
 264 #define PCI_VENDOR_ID_NEOMEGIC 0x10c8
 265 #endif
 266 #ifndef PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO
 267 #define PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO 0x8005
 268 #endif
 269 #ifndef PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO
 270 #define PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO 0x8006
 271 #endif
 272 #ifndef PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO
 273 #define PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO 0x8016
 274 #endif
 275
 276
 277 static struct pci_device_id snd_nm256_ids[] = {
 278         {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 279         {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 280         {PCI_VENDOR_ID_NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 281         {0,},
 282 };
 283
 284 MODULE_DEVICE_TABLE(pci, snd_nm256_ids);
 285
 286
 287 /*
 288  * lowlvel stuffs
 289  */
 290
 291 static inline u8
 292 snd_nm256_readb(nm256_t *chip, int offset)
 293 {
 294         return readb(chip->cport + offset);
 295 }
 296
 297 static inline u16
 298 snd_nm256_readw(nm256_t *chip, int offset)
 299 {
 300         return readw(chip->cport + offset);
 301 }
 302
 303 static inline u32
 304 snd_nm256_readl(nm256_t *chip, int offset)
 305 {
 306         return readl(chip->cport + offset);
 307 }
 308
 309 static inline void
 310 snd_nm256_writeb(nm256_t *chip, int offset, u8 val)
 311 {
 312         writeb(val, chip->cport + offset);
 313 }
 314
 315 static inline void
 316 snd_nm256_writew(nm256_t *chip, int offset, u16 val)
 317 {
 318         writew(val, chip->cport + offset);
 319 }
 320
 321 static inline void
 322 snd_nm256_writel(nm256_t *chip, int offset, u32 val)
 323 {
 324         writel(val, chip->cport + offset);
 325 }
 326
 327 static inline void
 328 snd_nm256_write_buffer(nm256_t *chip, void *src, int offset, int size)
 329 {
 330         offset -= chip->buffer_start;
 331 #ifdef SNDRV_CONFIG_DEBUG
 332         if (offset < 0 || offset >= chip->buffer_size) {
 333                 snd_printk("write_buffer invalid offset = %d size = %d\n", offset, size);
 334                 return;
 335         }
 336 #endif
 337         memcpy_toio(chip->buffer + offset, src, size);
 338 }
 339
 340 /*
 341  * coefficient handlers -- what a magic!
 342  */
 343
 344 static u16
 345 snd_nm256_get_start_offset(int which)
 346 {
 347         u16 offset = 0;
 348         while (which-- > 0)
 349                 offset += coefficient_sizes[which];
 350         return offset;
 351 }
 352
 353 static void
 354 snd_nm256_load_one_coefficient(nm256_t *chip, int stream, u32 port, int which)
 355 {
 356         u32 coeff_buf = chip->coeff_buf[stream];
 357         u16 offset = snd_nm256_get_start_offset(which);
 358         u16 size = coefficient_sizes[which];
 359
 360         snd_nm256_write_buffer(chip, coefficients + offset, coeff_buf, size);
 361         snd_nm256_writel(chip, port, coeff_buf);
 362         /* ???  Record seems to behave differently than playback.  */
 363         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 364                 size--;
 365         snd_nm256_writel(chip, port + 4, coeff_buf + size);
 366 }
 367
 368 static void
 369 snd_nm256_load_coefficient(nm256_t *chip, int stream, int number)
 370 {
 371         /* The enable register for the specified engine.  */
 372         u32 poffset = (stream == SNDRV_PCM_STREAM_CAPTURE ? NM_RECORD_ENABLE_REG : NM_PLAYBACK_ENABLE_REG);
 373         u32 addr = NM_COEFF_START_OFFSET;
 374
 375         addr += (stream == SNDRV_PCM_STREAM_CAPTURE ? NM_RECORD_REG_OFFSET : NM_PLAYBACK_REG_OFFSET);
 376
 377         if (snd_nm256_readb(chip, poffset) & 1) {
 378                 snd_printd("NM256: Engine was enabled while loading coefficients!\n");
 379                 return;
 380         }
 381
 382         /* The recording engine uses coefficient values 8-15.  */
 383         number &= 7;
 384         if (stream == SNDRV_PCM_STREAM_CAPTURE)
 385                 number += 8;
 386
 387         if (! chip->use_cache) {
 388                 snd_nm256_load_one_coefficient(chip, stream, addr, number);
 389                 return;
 390         }
 391         if (! chip->coeffs_current) {
 392                 snd_nm256_write_buffer(chip, coefficients, chip->all_coeff_buf,
 393                                        NM_TOTAL_COEFF_COUNT * 4);
 394                 chip->coeffs_current = 1;
 395         } else {
 396                 u32 base = chip->all_coeff_buf;
 397                 u32 offset = snd_nm256_get_start_offset(number);
 398                 u32 end_offset = offset + coefficient_sizes[number];
 399                 snd_nm256_writel(chip, addr, base + offset);
 400                 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 401                         end_offset--;
 402                 snd_nm256_writel(chip, addr + 4, base + end_offset);
 403         }
 404 }
 405
 406
 407 /* The actual rates supported by the card. */
 408 static unsigned int samplerates[8] = {
 409         8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000,
 410 };
 411 static snd_pcm_hw_constraint_list_t constraints_rates = {
 412         .count = ARRAY_SIZE(samplerates),
 413         .list = samplerates,
 414         .mask = 0,
 415 };
 416
 417 /*
 418  * return the index of the target rate
 419  */
 420 static int
 421 snd_nm256_fixed_rate(unsigned int rate)
 422 {
 423         unsigned int i;
 424         for (i = 0; i < ARRAY_SIZE(samplerates); i++) {
 425                 if (rate == samplerates[i])
 426                         return i;
 427         }
 428         snd_BUG();
 429         return 0;
 430 }
 431
 432 /*
 433  * set sample rate and format
 434  */
 435 static void
 436 snd_nm256_set_format(nm256_t *chip, nm256_stream_t *s, snd_pcm_substream_t *substream)
 437 {
 438         snd_pcm_runtime_t *runtime = substream->runtime;
 439         int rate_index = snd_nm256_fixed_rate(runtime->rate);
 440         unsigned char ratebits = (rate_index << 4) & NM_RATE_MASK;
 441
 442         s->shift = 0;
 443         if (snd_pcm_format_width(runtime->format) == 16) {
 444                 ratebits |= NM_RATE_BITS_16;
 445                 s->shift++;
 446         }
 447         if (runtime->channels > 1) {
 448                 ratebits |= NM_RATE_STEREO;
 449                 s->shift++;
 450         }
 451
 452         runtime->rate = samplerates[rate_index];
 453
 454         switch (substream->stream) {
 455         case SNDRV_PCM_STREAM_PLAYBACK:
 456                 snd_nm256_load_coefficient(chip, 0, rate_index); /* 0 = playback */
 457                 snd_nm256_writeb(chip,
 458                                  NM_PLAYBACK_REG_OFFSET + NM_RATE_REG_OFFSET,
 459                                  ratebits);
 460                 break;
 461         case SNDRV_PCM_STREAM_CAPTURE:
 462                 snd_nm256_load_coefficient(chip, 1, rate_index); /* 1 = record */
 463                 snd_nm256_writeb(chip,
 464                                  NM_RECORD_REG_OFFSET + NM_RATE_REG_OFFSET,
 465                                  ratebits);
 466                 break;
 467         }
 468 }
 469
 470 /* acquire interrupt */
 471 static int snd_nm256_acquire_irq(nm256_t *chip)
 472 {
 473         down(&chip->irq_mutex);
 474         if (chip->irq < 0) {
 475                 if (request_irq(chip->pci->irq, chip->interrupt, SA_INTERRUPT|SA_SHIRQ,
 476                                 chip->card->driver, (void*)chip)) {
 477                         snd_printk("unable to grab IRQ %d\n", chip->pci->irq);
 478                         up(&chip->irq_mutex);
 479                         return -EBUSY;
 480                 }
 481                 chip->irq = chip->pci->irq;
 482         }
 483         chip->irq_acks++;
 484         up(&chip->irq_mutex);
 485         return 0;
 486 }
 487
 488 /* release interrupt */
 489 static void snd_nm256_release_irq(nm256_t *chip)
 490 {
 491         down(&chip->irq_mutex);
 492         if (chip->irq_acks > 0)
 493                 chip->irq_acks--;
 494         if (chip->irq_acks == 0 && chip->irq >= 0) {
 495                 free_irq(chip->irq, (void*)chip);
 496                 chip->irq = -1;
 497         }
 498         up(&chip->irq_mutex);
 499 }
 500
 501 /*
 502  * start / stop
 503  */
 504
 505 /* update the watermark (current period) */
 506 static void snd_nm256_pcm_mark(nm256_t *chip, nm256_stream_t *s, int reg)
 507 {
 508         s->cur_period++;
 509         s->cur_period %= s->periods;
 510         snd_nm256_writel(chip, reg, s->buf + s->cur_period * s->period_size);
 511 }
 512
 513 #define snd_nm256_playback_mark(chip, s) snd_nm256_pcm_mark(chip, s, NM_PBUFFER_WMARK)
 514 #define snd_nm256_capture_mark(chip, s)  snd_nm256_pcm_mark(chip, s, NM_RBUFFER_WMARK)
 515
 516 static void
 517 snd_nm256_playback_start(nm256_t *chip, nm256_stream_t *s, snd_pcm_substream_t *substream)
 518 {
 519         /* program buffer pointers */
 520         snd_nm256_writel(chip, NM_PBUFFER_START, s->buf);
 521         snd_nm256_writel(chip, NM_PBUFFER_END, s->buf + s->dma_size - (1 << s->shift));
 522         snd_nm256_writel(chip, NM_PBUFFER_CURRP, s->buf);
 523         snd_nm256_playback_mark(chip, s);
 524
 525         /* Enable playback engine and interrupts. */
 526         snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG,
 527                          NM_PLAYBACK_ENABLE_FLAG | NM_PLAYBACK_FREERUN);
 528         /* Enable both channels. */
 529         snd_nm256_writew(chip, NM_AUDIO_MUTE_REG, 0x0);
 530 }
 531
 532 static void
 533 snd_nm256_capture_start(nm256_t *chip, nm256_stream_t *s, snd_pcm_substream_t *substream)
 534 {
 535         /* program buffer pointers */
 536         snd_nm256_writel(chip, NM_RBUFFER_START, s->buf);
 537         snd_nm256_writel(chip, NM_RBUFFER_END, s->buf + s->dma_size);
 538         snd_nm256_writel(chip, NM_RBUFFER_CURRP, s->buf);
 539         snd_nm256_capture_mark(chip, s);
 540
 541         /* Enable playback engine and interrupts. */
 542         snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG,
 543                          NM_RECORD_ENABLE_FLAG | NM_RECORD_FREERUN);
 544 }
 545
 546 /* Stop the play engine. */
 547 static void
 548 snd_nm256_playback_stop(nm256_t *chip)
 549 {
 550         /* Shut off sound from both channels. */
 551         snd_nm256_writew(chip, NM_AUDIO_MUTE_REG,
 552                          NM_AUDIO_MUTE_LEFT | NM_AUDIO_MUTE_RIGHT);
 553         /* Disable play engine. */
 554         snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG, 0);
 555 }
 556
 557 static void
 558 snd_nm256_capture_stop(nm256_t *chip)
 559 {
 560         /* Disable recording engine. */
 561         snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG, 0);
 562 }
 563
 564 static int
 565 snd_nm256_playback_trigger(snd_pcm_substream_t *substream, int cmd)
 566 {
 567         nm256_t *chip = snd_pcm_substream_chip(substream);
 568         nm256_stream_t *s = (nm256_stream_t*)substream->runtime->private_data;
 569         int err = 0;
 570
 571         snd_assert(s != NULL, return -ENXIO);
 572
 573         spin_lock(&chip->reg_lock);
 574         switch (cmd) {
 575         case SNDRV_PCM_TRIGGER_RESUME:
 576                 s->suspended = 0;
 577                 /* fallthru */
 578         case SNDRV_PCM_TRIGGER_START:
 579                 if (! s->running) {
 580                         snd_nm256_playback_start(chip, s, substream);
 581                         s->running = 1;
 582                 }
 583                 break;
 584         case SNDRV_PCM_TRIGGER_SUSPEND:
 585                 s->suspended = 1;
 586                 /* fallthru */
 587         case SNDRV_PCM_TRIGGER_STOP:
 588                 if (s->running) {
 589                         snd_nm256_playback_stop(chip);
 590                         s->running = 0;
 591                 }
 592                 break;
 593         default:
 594                 err = -EINVAL;
 595                 break;
 596         }
 597         spin_unlock(&chip->reg_lock);
 598         return err;
 599 }
 600
 601 static int
 602 snd_nm256_capture_trigger(snd_pcm_substream_t *substream, int cmd)
 603 {
 604         nm256_t *chip = snd_pcm_substream_chip(substream);
 605         nm256_stream_t *s = (nm256_stream_t*)substream->runtime->private_data;
 606         int err = 0;
 607
 608         snd_assert(s != NULL, return -ENXIO);
 609
 610         spin_lock(&chip->reg_lock);
 611         switch (cmd) {
 612         case SNDRV_PCM_TRIGGER_START:
 613         case SNDRV_PCM_TRIGGER_RESUME:
 614                 if (! s->running) {
 615                         snd_nm256_capture_start(chip, s, substream);
 616                         s->running = 1;
 617                 }
 618                 break;
 619         case SNDRV_PCM_TRIGGER_STOP:
 620         case SNDRV_PCM_TRIGGER_SUSPEND:
 621                 if (s->running) {
 622                         snd_nm256_capture_stop(chip);
 623                         s->running = 0;
 624                 }
 625                 break;
 626         default:
 627                 err = -EINVAL;
 628                 break;
 629         }
 630         spin_unlock(&chip->reg_lock);
 631         return err;
 632 }
 633
 634
 635 /*
 636  * prepare playback/capture channel
 637  */
 638 static int snd_nm256_pcm_prepare(snd_pcm_substream_t *substream)
 639 {
 640         nm256_t *chip = snd_pcm_substream_chip(substream);
 641         snd_pcm_runtime_t *runtime = substream->runtime;
 642         nm256_stream_t *s = (nm256_stream_t*)runtime->private_data;
 643
 644         snd_assert(s, return -ENXIO);
 645         s->dma_size = frames_to_bytes(runtime, substream->runtime->buffer_size);
 646         s->period_size = frames_to_bytes(runtime, substream->runtime->period_size);
 647         s->periods = substream->runtime->periods;
 648         s->cur_period = 0;
 649
 650         spin_lock_irq(&chip->reg_lock);
 651         s->running = 0;
 652         snd_nm256_set_format(chip, s, substream);
 653         spin_unlock_irq(&chip->reg_lock);
 654
 655         return 0;
 656 }
 657
 658
 659 /*
 660  * get the current pointer
 661  */
 662 static snd_pcm_uframes_t
 663 snd_nm256_playback_pointer(snd_pcm_substream_t * substream)
 664 {
 665         nm256_t *chip = snd_pcm_substream_chip(substream);
 666         nm256_stream_t *s = (nm256_stream_t*)substream->runtime->private_data;
 667         unsigned long curp;
 668
 669         snd_assert(s, return 0);
 670         curp = snd_nm256_readl(chip, NM_PBUFFER_CURRP) - (unsigned long)s->buf;
 671         curp %= s->dma_size;
 672         return bytes_to_frames(substream->runtime, curp);
 673 }
 674
 675 static snd_pcm_uframes_t
 676 snd_nm256_capture_pointer(snd_pcm_substream_t * substream)
 677 {
 678         nm256_t *chip = snd_pcm_substream_chip(substream);
 679         nm256_stream_t *s = (nm256_stream_t*)substream->runtime->private_data;
 680         unsigned long curp;
 681
 682         snd_assert(s != NULL, return 0);
 683         curp = snd_nm256_readl(chip, NM_RBUFFER_CURRP) - (unsigned long)s->buf;
 684         curp %= s->dma_size;
 685         return bytes_to_frames(substream->runtime, curp);
 686 }
 687
 688 /* Remapped I/O space can be accessible as pointer on i386 */
 689 /* This might be changed in the future */
 690 #ifndef __i386__
 691 /*
 692  * silence / copy for playback
 693  */
 694 static int
 695 snd_nm256_playback_silence(snd_pcm_substream_t *substream,
 696                            int channel, /* not used (interleaved data) */
 697                            snd_pcm_uframes_t pos,
 698                            snd_pcm_uframes_t count)
 699 {
 700         snd_pcm_runtime_t *runtime = substream->runtime;
 701         nm256_stream_t *s = (nm256_stream_t*)runtime->private_data;
 702         count = frames_to_bytes(runtime, count);
 703         pos = frames_to_bytes(runtime, pos);
 704         memset_io(s->bufptr + pos, 0, count);
 705         return 0;
 706 }
 707
 708 static int
 709 snd_nm256_playback_copy(snd_pcm_substream_t *substream,
 710                         int channel, /* not used (interleaved data) */
 711                         snd_pcm_uframes_t pos,
 712                         void __user *src,
 713                         snd_pcm_uframes_t count)
 714 {
 715         snd_pcm_runtime_t *runtime = substream->runtime;
 716         nm256_stream_t *s = (nm256_stream_t*)runtime->private_data;
 717         count = frames_to_bytes(runtime, count);
 718         pos = frames_to_bytes(runtime, pos);
 719         if (copy_from_user_toio(s->bufptr + pos, src, count))
 720                 return -EFAULT;
 721         return 0;
 722 }
 723
 724 /*
 725  * copy to user
 726  */
 727 static int
 728 snd_nm256_capture_copy(snd_pcm_substream_t *substream,
 729                        int channel, /* not used (interleaved data) */
 730                        snd_pcm_uframes_t pos,
 731                        void __user *dst,
 732                        snd_pcm_uframes_t count)
 733 {
 734         snd_pcm_runtime_t *runtime = substream->runtime;
 735         nm256_stream_t *s = (nm256_stream_t*)runtime->private_data;
 736         count = frames_to_bytes(runtime, count);
 737         pos = frames_to_bytes(runtime, pos);
 738         if (copy_to_user_fromio(dst, s->bufptr + pos, count))
 739                 return -EFAULT;
 740         return 0;
 741 }
 742
 743 #endif /* !__i386__ */
 744
 745
 746 /*
 747  * update playback/capture watermarks
 748  */
 749
 750 /* spinlock held! */
 751 static void
 752 snd_nm256_playback_update(nm256_t *chip)
 753 {
 754         nm256_stream_t *s;
 755
 756         s = &chip->streams[SNDRV_PCM_STREAM_PLAYBACK];
 757         if (s->running && s->substream) {
 758                 spin_unlock(&chip->reg_lock);
 759                 snd_pcm_period_elapsed(s->substream);
 760                 spin_lock(&chip->reg_lock);
 761                 snd_nm256_playback_mark(chip, s);
 762         }
 763 }
 764
 765 /* spinlock held! */
 766 static void
 767 snd_nm256_capture_update(nm256_t *chip)
 768 {
 769         nm256_stream_t *s;
 770
 771         s = &chip->streams[SNDRV_PCM_STREAM_CAPTURE];
 772         if (s->running && s->substream) {
 773                 spin_unlock(&chip->reg_lock);
 774                 snd_pcm_period_elapsed(s->substream);
 775                 spin_lock(&chip->reg_lock);
 776                 snd_nm256_capture_mark(chip, s);
 777         }
 778 }
 779
 780 /*
 781  * hardware info
 782  */
 783 static snd_pcm_hardware_t snd_nm256_playback =
 784 {
 785         .info =                 SNDRV_PCM_INFO_MMAP_IOMEM |SNDRV_PCM_INFO_MMAP_VALID |
 786                                 SNDRV_PCM_INFO_INTERLEAVED |
 787                                 /*SNDRV_PCM_INFO_PAUSE |*/
 788                                 SNDRV_PCM_INFO_RESUME,
 789         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
 790         .rates =                SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
 791         .rate_min =             8000,
 792         .rate_max =             48000,
 793         .channels_min =         1,
 794         .channels_max =         2,
 795         .periods_min =          2,
 796         .periods_max =          1024,
 797         .buffer_bytes_max =     128 * 1024,
 798         .period_bytes_min =     256,
 799         .period_bytes_max =     128 * 1024,
 800 };
 801
 802 static snd_pcm_hardware_t snd_nm256_capture =
 803 {
 804         .info =                 SNDRV_PCM_INFO_MMAP_IOMEM | SNDRV_PCM_INFO_MMAP_VALID |
 805                                 SNDRV_PCM_INFO_INTERLEAVED |
 806                                 /*SNDRV_PCM_INFO_PAUSE |*/
 807                                 SNDRV_PCM_INFO_RESUME,
 808         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
 809         .rates =                SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
 810         .rate_min =             8000,
 811         .rate_max =             48000,
 812         .channels_min =         1,
 813         .channels_max =         2,
 814         .periods_min =          2,
 815         .periods_max =          1024,
 816         .buffer_bytes_max =     128 * 1024,
 817         .period_bytes_min =     256,
 818         .period_bytes_max =     128 * 1024,
 819 };
 820
 821
 822 /* set dma transfer size */
 823 static int snd_nm256_pcm_hw_params(snd_pcm_substream_t *substream, snd_pcm_hw_params_t *hw_params)
 824 {
 825         /* area and addr are already set and unchanged */
 826         substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
 827         return 0;
 828 }
 829
 830 /*
 831  * open
 832  */
 833 static void snd_nm256_setup_stream(nm256_t *chip, nm256_stream_t *s,
 834                                    snd_pcm_substream_t *substream,
 835                                    snd_pcm_hardware_t *hw_ptr)
 836 {
 837         snd_pcm_runtime_t *runtime = substream->runtime;
 838
 839         s->running = 0;
 840         runtime->hw = *hw_ptr;
 841         runtime->hw.buffer_bytes_max = s->bufsize;
 842         runtime->hw.period_bytes_max = s->bufsize / 2;
 843         runtime->dma_area = (void __force *) s->bufptr;
 844         runtime->dma_addr = s->bufptr_addr;
 845         runtime->dma_bytes = s->bufsize;
 846         runtime->private_data = s;
 847         s->substream = substream;
 848
 849         snd_pcm_set_sync(substream);
 850         snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
 851                                    &constraints_rates);
 852 }
 853
 854 static int
 855 snd_nm256_playback_open(snd_pcm_substream_t *substream)
 856 {
 857         nm256_t *chip = snd_pcm_substream_chip(substream);
 858
 859         if (snd_nm256_acquire_irq(chip) < 0)
 860                 return -EBUSY;
 861         snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_PLAYBACK],
 862                                substream, &snd_nm256_playback);
 863         return 0;
 864 }
 865
 866 static int
 867 snd_nm256_capture_open(snd_pcm_substream_t *substream)
 868 {
 869         nm256_t *chip = snd_pcm_substream_chip(substream);
 870
 871         if (snd_nm256_acquire_irq(chip) < 0)
 872                 return -EBUSY;
 873         snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_CAPTURE],
 874                                substream, &snd_nm256_capture);
 875         return 0;
 876 }
 877
 878 /*
 879  * close - we don't have to do special..
 880  */
 881 static int
 882 snd_nm256_playback_close(snd_pcm_substream_t *substream)
 883 {
 884         nm256_t *chip = snd_pcm_substream_chip(substream);
 885
 886         snd_nm256_release_irq(chip);
 887         return 0;
 888 }
 889
 890
 891 static int
 892 snd_nm256_capture_close(snd_pcm_substream_t *substream)
 893 {
 894         nm256_t *chip = snd_pcm_substream_chip(substream);
 895
 896         snd_nm256_release_irq(chip);
 897         return 0;
 898 }
 899
 900 /*
 901  * create a pcm instance
 902  */
 903 static snd_pcm_ops_t snd_nm256_playback_ops = {
 904         .open =         snd_nm256_playback_open,
 905         .close =        snd_nm256_playback_close,
 906         .ioctl =        snd_pcm_lib_ioctl,
 907         .hw_params =    snd_nm256_pcm_hw_params,
 908         .prepare =      snd_nm256_pcm_prepare,
 909         .trigger =      snd_nm256_playback_trigger,
 910         .pointer =      snd_nm256_playback_pointer,
 911 #ifndef __i386__
 912         .copy =         snd_nm256_playback_copy,
 913         .silence =      snd_nm256_playback_silence,
 914 #endif
 915         .mmap =         snd_pcm_lib_mmap_iomem,
 916 };
 917
 918 static snd_pcm_ops_t snd_nm256_capture_ops = {
 919         .open =         snd_nm256_capture_open,
 920         .close =        snd_nm256_capture_close,
 921         .ioctl =        snd_pcm_lib_ioctl,
 922         .hw_params =    snd_nm256_pcm_hw_params,
 923         .prepare =      snd_nm256_pcm_prepare,
 924         .trigger =      snd_nm256_capture_trigger,
 925         .pointer =      snd_nm256_capture_pointer,
 926 #ifndef __i386__
 927         .copy =         snd_nm256_capture_copy,
 928 #endif
 929         .mmap =         snd_pcm_lib_mmap_iomem,
 930 };
 931
 932 static int __devinit
 933 snd_nm256_pcm(nm256_t *chip, int device)
 934 {
 935         snd_pcm_t *pcm;
 936         int i, err;
 937
 938         for (i = 0; i < 2; i++) {
 939                 nm256_stream_t *s = &chip->streams[i];
 940                 s->bufptr = chip->buffer + (s->buf - chip->buffer_start);
 941                 s->bufptr_addr = chip->buffer_addr + (s->buf - chip->buffer_start);
 942         }
 943
 944         err = snd_pcm_new(chip->card, chip->card->driver, device,
 945                           1, 1, &pcm);
 946         if (err < 0)
 947                 return err;
 948
 949         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_nm256_playback_ops);
 950         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_nm256_capture_ops);
 951
 952         pcm->private_data = chip;
 953         pcm->info_flags = 0;
 954         chip->pcm = pcm;
 955
 956         return 0;
 957 }
 958
 959
 960 /*
 961  * Initialize the hardware.
 962  */
 963 static void
 964 snd_nm256_init_chip(nm256_t *chip)
 965 {
 966         /* Reset everything. */
 967         snd_nm256_writeb(chip, 0x0, 0x11);
 968         snd_nm256_writew(chip, 0x214, 0);
 969         /* stop sounds.. */
 970         //snd_nm256_playback_stop(chip);
 971         //snd_nm256_capture_stop(chip);
 972 }
 973
 974
 975 static irqreturn_t
 976 snd_nm256_intr_check(nm256_t *chip)
 977 {
 978         if (chip->badintrcount++ > 1000) {
 979                 /*
 980                  * I'm not sure if the best thing is to stop the card from
 981                  * playing or just release the interrupt (after all, we're in
 982                  * a bad situation, so doing fancy stuff may not be such a good
 983                  * idea).
 984                  *
 985                  * I worry about the card engine continuing to play noise
 986                  * over and over, however--that could become a very
 987                  * obnoxious problem.  And we know that when this usually
 988                  * happens things are fairly safe, it just means the user's
 989                  * inserted a PCMCIA card and someone's spamming us with IRQ 9s.
 990                  */
 991                 if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
 992                         snd_nm256_playback_stop(chip);
 993                 if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
 994                         snd_nm256_capture_stop(chip);
 995                 chip->badintrcount = 0;
 996                 return IRQ_HANDLED;
 997         }
 998         return IRQ_NONE;
 999 }
1000
1001 /*
1002  * Handle a potential interrupt for the device referred to by DEV_ID.
1003  *
1004  * I don't like the cut-n-paste job here either between the two routines,
1005  * but there are sufficient differences between the two interrupt handlers
1006  * that parameterizing it isn't all that great either.  (Could use a macro,
1007  * I suppose...yucky bleah.)
1008  */
1009
1010 static irqreturn_t
1011 snd_nm256_interrupt(int irq, void *dev_id, struct pt_regs *dummy)
1012 {
1013         nm256_t *chip = dev_id;
1014         u16 status;
1015         u8 cbyte;
1016
1017         status = snd_nm256_readw(chip, NM_INT_REG);
1018
1019         /* Not ours. */
1020         if (status == 0)
1021                 return snd_nm256_intr_check(chip);
1022
1023         chip->badintrcount = 0;
1024
1025         /* Rather boring; check for individual interrupts and process them. */
1026
1027         spin_lock(&chip->reg_lock);
1028         if (status & NM_PLAYBACK_INT) {
1029                 status &= ~NM_PLAYBACK_INT;
1030                 NM_ACK_INT(chip, NM_PLAYBACK_INT);
1031                 snd_nm256_playback_update(chip);
1032         }
1033
1034         if (status & NM_RECORD_INT) {
1035                 status &= ~NM_RECORD_INT;
1036                 NM_ACK_INT(chip, NM_RECORD_INT);
1037                 snd_nm256_capture_update(chip);
1038         }
1039
1040         if (status & NM_MISC_INT_1) {
1041                 status &= ~NM_MISC_INT_1;
1042                 NM_ACK_INT(chip, NM_MISC_INT_1);
1043                 snd_printd("NM256: Got misc interrupt #1\n");
1044                 snd_nm256_writew(chip, NM_INT_REG, 0x8000);
1045                 cbyte = snd_nm256_readb(chip, 0x400);
1046                 snd_nm256_writeb(chip, 0x400, cbyte | 2);
1047         }
1048
1049         if (status & NM_MISC_INT_2) {
1050                 status &= ~NM_MISC_INT_2;
1051                 NM_ACK_INT(chip, NM_MISC_INT_2);
1052                 snd_printd("NM256: Got misc interrupt #2\n");
1053                 cbyte = snd_nm256_readb(chip, 0x400);
1054                 snd_nm256_writeb(chip, 0x400, cbyte & ~2);
1055         }
1056
1057         /* Unknown interrupt. */
1058         if (status) {
1059                 snd_printd("NM256: Fire in the hole! Unknown status 0x%x\n",
1060                            status);
1061                 /* Pray. */
1062                 NM_ACK_INT(chip, status);
1063         }
1064
1065         spin_unlock(&chip->reg_lock);
1066         return IRQ_HANDLED;
1067 }
1068
1069 /*
1070  * Handle a potential interrupt for the device referred to by DEV_ID.
1071  * This handler is for the 256ZX, and is very similar to the non-ZX
1072  * routine.
1073  */
1074
1075 static irqreturn_t
1076 snd_nm256_interrupt_zx(int irq, void *dev_id, struct pt_regs *dummy)
1077 {
1078         nm256_t *chip = dev_id;
1079         u32 status;
1080         u8 cbyte;
1081
1082         status = snd_nm256_readl(chip, NM_INT_REG);
1083
1084         /* Not ours. */
1085         if (status == 0)
1086                 return snd_nm256_intr_check(chip);
1087
1088         chip->badintrcount = 0;
1089
1090         /* Rather boring; check for individual interrupts and process them. */
1091
1092         spin_lock(&chip->reg_lock);
1093         if (status & NM2_PLAYBACK_INT) {
1094                 status &= ~NM2_PLAYBACK_INT;
1095                 NM2_ACK_INT(chip, NM2_PLAYBACK_INT);
1096                 snd_nm256_playback_update(chip);
1097         }
1098
1099         if (status & NM2_RECORD_INT) {
1100                 status &= ~NM2_RECORD_INT;
1101                 NM2_ACK_INT(chip, NM2_RECORD_INT);
1102                 snd_nm256_capture_update(chip);
1103         }
1104
1105         if (status & NM2_MISC_INT_1) {
1106                 status &= ~NM2_MISC_INT_1;
1107                 NM2_ACK_INT(chip, NM2_MISC_INT_1);
1108                 snd_printd("NM256: Got misc interrupt #1\n");
1109                 cbyte = snd_nm256_readb(chip, 0x400);
1110                 snd_nm256_writeb(chip, 0x400, cbyte | 2);
1111         }
1112
1113         if (status & NM2_MISC_INT_2) {
1114                 status &= ~NM2_MISC_INT_2;
1115                 NM2_ACK_INT(chip, NM2_MISC_INT_2);
1116                 snd_printd("NM256: Got misc interrupt #2\n");
1117                 cbyte = snd_nm256_readb(chip, 0x400);
1118                 snd_nm256_writeb(chip, 0x400, cbyte & ~2);
1119         }
1120
1121         /* Unknown interrupt. */
1122         if (status) {
1123                 snd_printd("NM256: Fire in the hole! Unknown status 0x%x\n",
1124                            status);
1125                 /* Pray. */
1126                 NM2_ACK_INT(chip, status);
1127         }
1128
1129         spin_unlock(&chip->reg_lock);
1130         return IRQ_HANDLED;
1131 }
1132
1133 /*
1134  * AC97 interface
1135  */
1136
1137 /*
1138  * Waits for the mixer to become ready to be written; returns a zero value
1139  * if it timed out.
1140  */
1141 static int
1142 snd_nm256_ac97_ready(nm256_t *chip)
1143 {
1144         int timeout = 10;
1145         u32 testaddr;
1146         u16 testb;
1147
1148         testaddr = chip->mixer_status_offset;
1149         testb = chip->mixer_status_mask;
1150
1151         /*
1152          * Loop around waiting for the mixer to become ready.
1153          */
1154         while (timeout-- > 0) {
1155                 if ((snd_nm256_readw(chip, testaddr) & testb) == 0)
1156                         return 1;
1157                 udelay(100);
1158         }
1159         return 0;
1160 }
1161
1162 /*
1163  */
1164 static unsigned short
1165 snd_nm256_ac97_read(ac97_t *ac97, unsigned short reg)
1166 {
1167         nm256_t *chip = ac97->private_data;
1168         int res;
1169
1170         if (reg >= 128)
1171                 return 0;
1172
1173         if (! snd_nm256_ac97_ready(chip))
1174                 return 0;
1175         res = snd_nm256_readw(chip, chip->mixer_base + reg);
1176         /* Magic delay.  Bleah yucky.  */
1177         msleep(1);
1178         return res;
1179 }
1180
1181 /*
1182  */
1183 static void
1184 snd_nm256_ac97_write(ac97_t *ac97,
1185                      unsigned short reg, unsigned short val)
1186 {
1187         nm256_t *chip = ac97->private_data;
1188         int tries = 2;
1189         u32 base;
1190
1191         base = chip->mixer_base;
1192
1193         snd_nm256_ac97_ready(chip);
1194
1195         /* Wait for the write to take, too. */
1196         while (tries-- > 0) {
1197                 snd_nm256_writew(chip, base + reg, val);
1198                 msleep(1);  /* a little delay here seems better.. */
1199                 if (snd_nm256_ac97_ready(chip))
1200                         return;
1201         }
1202         snd_printd("nm256: ac97 codec not ready..\n");
1203 }
1204
1205 /* initialize the ac97 into a known state */
1206 static void
1207 snd_nm256_ac97_reset(ac97_t *ac97)
1208 {
1209         nm256_t *chip = ac97->private_data;
1210
1211         /* Reset the mixer.  'Tis magic!  */
1212         snd_nm256_writeb(chip, 0x6c0, 1);
1213         if (! chip->reset_workaround) {
1214                 /* Dell latitude LS will lock up by this */
1215                 snd_nm256_writeb(chip, 0x6cc, 0x87);
1216         }
1217         snd_nm256_writeb(chip, 0x6cc, 0x80);
1218         snd_nm256_writeb(chip, 0x6cc, 0x0);
1219 }
1220
1221 /* create an ac97 mixer interface */
1222 static int __devinit
1223 snd_nm256_mixer(nm256_t *chip)
1224 {
1225         ac97_bus_t *pbus;
1226         ac97_template_t ac97;
1227         int i, err;
1228         static ac97_bus_ops_t ops = {
1229                 .reset = snd_nm256_ac97_reset,
1230                 .write = snd_nm256_ac97_write,
1231                 .read = snd_nm256_ac97_read,
1232         };
1233         /* looks like nm256 hangs up when unexpected registers are touched... */
1234         static int mixer_regs[] = {
1235                 AC97_MASTER, AC97_HEADPHONE, AC97_MASTER_MONO,
1236                 AC97_PC_BEEP, AC97_PHONE, AC97_MIC, AC97_LINE, AC97_CD,
1237                 AC97_VIDEO, AC97_AUX, AC97_PCM, AC97_REC_SEL,
1238                 AC97_REC_GAIN, AC97_GENERAL_PURPOSE, AC97_3D_CONTROL,
1239                 /*AC97_EXTENDED_ID,*/
1240                 AC97_VENDOR_ID1, AC97_VENDOR_ID2,
1241                 -1
1242         };
1243
1244         if ((err = snd_ac97_bus(chip->card, 0, &ops, NULL, &pbus)) < 0)
1245                 return err;
1246
1247         memset(&ac97, 0, sizeof(ac97));
1248         ac97.scaps = AC97_SCAP_AUDIO; /* we support audio! */
1249         ac97.limited_regs = 1;
1250         for (i = 0; mixer_regs[i] >= 0; i++)
1251                 set_bit(mixer_regs[i], ac97.reg_accessed);
1252         ac97.private_data = chip;
1253         pbus->no_vra = 1;
1254         err = snd_ac97_mixer(pbus, &ac97, &chip->ac97);
1255         if (err < 0)
1256                 return err;
1257         if (! (chip->ac97->id & (0xf0000000))) {
1258                 /* looks like an invalid id */
1259                 sprintf(chip->card->mixername, "%s AC97", chip->card->driver);
1260         }
1261         return 0;
1262 }
1263
1264 /*
1265  * See if the signature left by the NM256 BIOS is intact; if so, we use
1266  * the associated address as the end of our audio buffer in the video
1267  * RAM.
1268  */
1269
1270 static int __devinit
1271 snd_nm256_peek_for_sig(nm256_t *chip)
1272 {
1273         /* The signature is located 1K below the end of video RAM.  */
1274         void __iomem *temp;
1275         /* Default buffer end is 5120 bytes below the top of RAM.  */
1276         unsigned long pointer_found = chip->buffer_end - 0x1400;
1277         u32 sig;
1278
1279         temp = ioremap_nocache(chip->buffer_addr + chip->buffer_end - 0x400, 16);
1280         if (temp == NULL) {
1281                 snd_printk("Unable to scan for card signature in video RAM\n");
1282                 return -EBUSY;
1283         }
1284
1285         sig = readl(temp);
1286         if ((sig & NM_SIG_MASK) == NM_SIGNATURE) {
1287                 u32 pointer = readl(temp + 4);
1288
1289                 /*
1290                  * If it's obviously invalid, don't use it
1291                  */
1292                 if (pointer == 0xffffffff ||
1293                     pointer < chip->buffer_size ||
1294                     pointer > chip->buffer_end) {
1295                         snd_printk("invalid signature found: 0x%x\n", pointer);
1296                         iounmap(temp);
1297                         return -ENODEV;
1298                 } else {
1299                         pointer_found = pointer;
1300                         printk(KERN_INFO "nm256: found card signature in video RAM: 0x%x\n", pointer);
1301                 }
1302         }
1303
1304         iounmap(temp);
1305         chip->buffer_end = pointer_found;
1306
1307         return 0;
1308 }
1309
1310 #ifdef CONFIG_PM
1311 /*
1312  * APM event handler, so the card is properly reinitialized after a power
1313  * event.
1314  */
1315 static int nm256_suspend(snd_card_t *card, pm_message_t state)
1316 {
1317         nm256_t *chip = card->pm_private_data;
1318
1319         snd_pcm_suspend_all(chip->pcm);
1320         snd_ac97_suspend(chip->ac97);
1321         chip->coeffs_current = 0;
1322         pci_disable_device(chip->pci);
1323         return 0;
1324 }
1325
1326 static int nm256_resume(snd_card_t *card)
1327 {
1328         nm256_t *chip = card->pm_private_data;
1329         int i;
1330
1331         /* Perform a full reset on the hardware */
1332         pci_enable_device(chip->pci);
1333         snd_nm256_init_chip(chip);
1334
1335         /* restore ac97 */
1336         snd_ac97_resume(chip->ac97);
1337
1338         for (i = 0; i < 2; i++) {
1339                 nm256_stream_t *s = &chip->streams[i];
1340                 if (s->substream && s->suspended) {
1341                         spin_lock_irq(&chip->reg_lock);
1342                         snd_nm256_set_format(chip, s, s->substream);
1343                         spin_unlock_irq(&chip->reg_lock);
1344                 }
1345         }
1346
1347         return 0;
1348 }
1349 #endif /* CONFIG_PM */
1350
1351 static int snd_nm256_free(nm256_t *chip)
1352 {
1353         if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
1354                 snd_nm256_playback_stop(chip);
1355         if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
1356                 snd_nm256_capture_stop(chip);
1357
1358         if (chip->irq >= 0)
1359                 synchronize_irq(chip->irq);
1360
1361         if (chip->cport)
1362                 iounmap(chip->cport);
1363         if (chip->buffer)
1364                 iounmap(chip->buffer);
1365         if (chip->res_cport) {
1366                 release_resource(chip->res_cport);
1367                 kfree_nocheck(chip->res_cport);
1368         }
1369         if (chip->res_buffer) {
1370                 release_resource(chip->res_buffer);
1371                 kfree_nocheck(chip->res_buffer);
1372         }
1373         if (chip->irq >= 0)
1374                 free_irq(chip->irq, (void*)chip);
1375
1376         pci_disable_device(chip->pci);
1377         kfree(chip);
1378         return 0;
1379 }
1380
1381 static int snd_nm256_dev_free(snd_device_t *device)
1382 {
1383         nm256_t *chip = device->device_data;
1384         return snd_nm256_free(chip);
1385 }
1386
1387 static int __devinit
1388 snd_nm256_create(snd_card_t *card, struct pci_dev *pci,
1389                  int play_bufsize, int capt_bufsize,
1390                  int force_load,
1391                  u32 buffertop,
1392                  int usecache,
1393                  nm256_t **chip_ret)
1394 {
1395         nm256_t *chip;
1396         int err, pval;
1397         static snd_device_ops_t ops = {
1398                 .dev_free =     snd_nm256_dev_free,
1399         };
1400         u32 addr;
1401
1402         *chip_ret = NULL;
1403
1404         if ((err = pci_enable_device(pci)) < 0)
1405                 return err;
1406
1407         chip = kcalloc(1, sizeof(*chip), GFP_KERNEL);
1408         if (chip == NULL) {
1409                 pci_disable_device(pci);
1410                 return -ENOMEM;
1411         }
1412
1413         chip->card = card;
1414         chip->pci = pci;
1415         chip->use_cache = usecache;
1416         spin_lock_init(&chip->reg_lock);
1417         chip->irq = -1;
1418         init_MUTEX(&chip->irq_mutex);
1419
1420         chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize = play_bufsize;
1421         chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize = capt_bufsize;
1422
1423         /*
1424          * The NM256 has two memory ports.  The first port is nothing
1425          * more than a chunk of video RAM, which is used as the I/O ring
1426          * buffer.  The second port has the actual juicy stuff (like the
1427          * mixer and the playback engine control registers).
1428          */
1429
1430         chip->buffer_addr = pci_resource_start(pci, 0);
1431         chip->cport_addr = pci_resource_start(pci, 1);
1432
1433         /* Init the memory port info.  */
1434         /* remap control port (#2) */
1435         chip->res_cport = request_mem_region(chip->cport_addr, NM_PORT2_SIZE,
1436                                              card->driver);
1437         if (chip->res_cport == NULL) {
1438                 snd_printk("memory region 0x%lx (size 0x%x) busy\n",
1439                            chip->cport_addr, NM_PORT2_SIZE);
1440                 err = -EBUSY;
1441                 goto __error;
1442         }
1443         chip->cport = ioremap_nocache(chip->cport_addr, NM_PORT2_SIZE);
1444         if (chip->cport == NULL) {
1445                 snd_printk("unable to map control port %lx\n", chip->cport_addr);
1446                 err = -ENOMEM;
1447                 goto __error;
1448         }
1449
1450         if (!strcmp(card->driver, "NM256AV")) {
1451                 /* Ok, try to see if this is a non-AC97 version of the hardware. */
1452                 pval = snd_nm256_readw(chip, NM_MIXER_PRESENCE);
1453                 if ((pval & NM_PRESENCE_MASK) != NM_PRESENCE_VALUE) {
1454                         if (! force_load) {
1455                                 printk(KERN_ERR "nm256: no ac97 is found!\n");
1456                                 printk(KERN_ERR "  force the driver to load by passing in the module parameter\n");
1457                                 printk(KERN_ERR "    force_ac97=1\n");
1458                                 printk(KERN_ERR "  or try sb16 or cs423x drivers instead.\n");
1459                                 err = -ENXIO;
1460                                 goto __error;
1461                         }
1462                 }
1463                 chip->buffer_end = 2560 * 1024;
1464                 chip->interrupt = snd_nm256_interrupt;
1465                 chip->mixer_status_offset = NM_MIXER_STATUS_OFFSET;
1466                 chip->mixer_status_mask = NM_MIXER_READY_MASK;
1467         } else {
1468                 /* Not sure if there is any relevant detect for the ZX or not.  */
1469                 if (snd_nm256_readb(chip, 0xa0b) != 0)
1470                         chip->buffer_end = 6144 * 1024;
1471                 else
1472                         chip->buffer_end = 4096 * 1024;
1473
1474                 chip->interrupt = snd_nm256_interrupt_zx;
1475                 chip->mixer_status_offset = NM2_MIXER_STATUS_OFFSET;
1476                 chip->mixer_status_mask = NM2_MIXER_READY_MASK;
1477         }
1478
1479         chip->buffer_size = chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize + chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
1480         if (chip->use_cache)
1481                 chip->buffer_size += NM_TOTAL_COEFF_COUNT * 4;
1482         else
1483                 chip->buffer_size += NM_MAX_PLAYBACK_COEF_SIZE + NM_MAX_RECORD_COEF_SIZE;
1484
1485         if (buffertop >= chip->buffer_size && buffertop < chip->buffer_end)
1486                 chip->buffer_end = buffertop;
1487         else {
1488                 /* get buffer end pointer from signature */
1489                 if ((err = snd_nm256_peek_for_sig(chip)) < 0)
1490                         goto __error;
1491         }
1492
1493         chip->buffer_start = chip->buffer_end - chip->buffer_size;
1494         chip->buffer_addr += chip->buffer_start;
1495
1496         printk(KERN_INFO "nm256: Mapping port 1 from 0x%x - 0x%x\n",
1497                chip->buffer_start, chip->buffer_end);
1498
1499         chip->res_buffer = request_mem_region(chip->buffer_addr,
1500                                               chip->buffer_size,
1501                                               card->driver);
1502         if (chip->res_buffer == NULL) {
1503                 snd_printk("nm256: buffer 0x%lx (size 0x%x) busy\n",
1504                            chip->buffer_addr, chip->buffer_size);
1505                 err = -EBUSY;
1506                 goto __error;
1507         }
1508         chip->buffer = ioremap_nocache(chip->buffer_addr, chip->buffer_size);
1509         if (chip->buffer == NULL) {
1510                 err = -ENOMEM;
1511                 snd_printk("unable to map ring buffer at %lx\n", chip->buffer_addr);
1512                 goto __error;
1513         }
1514
1515         /* set offsets */
1516         addr = chip->buffer_start;
1517         chip->streams[SNDRV_PCM_STREAM_PLAYBACK].buf = addr;
1518         addr += chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize;
1519         chip->streams[SNDRV_PCM_STREAM_CAPTURE].buf = addr;
1520         addr += chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
1521         if (chip->use_cache) {
1522                 chip->all_coeff_buf = addr;
1523         } else {
1524                 chip->coeff_buf[SNDRV_PCM_STREAM_PLAYBACK] = addr;
1525                 addr += NM_MAX_PLAYBACK_COEF_SIZE;
1526                 chip->coeff_buf[SNDRV_PCM_STREAM_CAPTURE] = addr;
1527         }
1528
1529         /* Fixed setting. */
1530         chip->mixer_base = NM_MIXER_OFFSET;
1531
1532         chip->coeffs_current = 0;
1533
1534         snd_nm256_init_chip(chip);
1535
1536         // pci_set_master(pci); /* needed? */
1537
1538         snd_card_set_pm_callback(card, nm256_suspend, nm256_resume, chip);
1539
1540         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0)
1541                 goto __error;
1542
1543         snd_card_set_dev(card, &pci->dev);
1544
1545         *chip_ret = chip;
1546         return 0;
1547
1548 __error:
1549         snd_nm256_free(chip);
1550         return err;
1551 }
1552
1553
1554 struct nm256_quirk {
1555         unsigned short vendor;
1556         unsigned short device;
1557         int type;
1558 };
1559
1560 enum { NM_BLACKLISTED, NM_RESET_WORKAROUND };
1561
1562 static struct nm256_quirk nm256_quirks[] __devinitdata = {
1563         /* HP omnibook 4150 has cs4232 codec internally */
1564         { .vendor = 0x103c, .device = 0x0007, .type = NM_BLACKLISTED },
1565         /* Sony PCG-F305 */
1566         { .vendor = 0x104d, .device = 0x8041, .type = NM_RESET_WORKAROUND },
1567         /* Dell Latitude LS */
1568         { .vendor = 0x1028, .device = 0x0080, .type = NM_RESET_WORKAROUND },
1569         { } /* terminator */
1570 };
1571
1572
1573 static int __devinit snd_nm256_probe(struct pci_dev *pci,
1574                                      const struct pci_device_id *pci_id)
1575 {
1576         static int dev;
1577         snd_card_t *card;
1578         nm256_t *chip;
1579         int err;
1580         unsigned int xbuffer_top;
1581         struct nm256_quirk *q;
1582         u16 subsystem_vendor, subsystem_device;
1583
1584         if (dev >= SNDRV_CARDS)
1585                 return -ENODEV;
1586         if (!enable[dev]) {
1587                 dev++;
1588                 return -ENOENT;
1589         }
1590
1591         pci_read_config_word(pci, PCI_SUBSYSTEM_VENDOR_ID, &subsystem_vendor);
1592         pci_read_config_word(pci, PCI_SUBSYSTEM_ID, &subsystem_device);
1593
1594         for (q = nm256_quirks; q->vendor; q++) {
1595                 if (q->vendor == subsystem_vendor && q->device == subsystem_device) {
1596                         switch (q->type) {
1597                         case NM_BLACKLISTED:
1598                                 printk(KERN_INFO "nm256: The device is blacklisted.  Loading stopped\n");
1599                                 return -ENODEV;
1600                         case NM_RESET_WORKAROUND:
1601                                 reset_workaround[dev] = 1;
1602                                 break;
1603                         }
1604                 }
1605         }
1606
1607         card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
1608         if (card == NULL)
1609                 return -ENOMEM;
1610
1611         switch (pci->device) {
1612         case PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO:
1613                 strcpy(card->driver, "NM256AV");
1614                 break;
1615         case PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO:
1616                 strcpy(card->driver, "NM256ZX");
1617                 break;
1618         case PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO:
1619                 strcpy(card->driver, "NM256XL+");
1620                 break;
1621         default:
1622                 snd_printk("invalid device id 0x%x\n", pci->device);
1623                 snd_card_free(card);
1624                 return -EINVAL;
1625         }
1626
1627         if (vaio_hack[dev])
1628                 xbuffer_top = 0x25a800; /* this avoids conflicts with XFree86 server */
1629         else
1630                 xbuffer_top = buffer_top[dev];
1631
1632         if (playback_bufsize[dev] < 4)
1633                 playback_bufsize[dev] = 4;
1634         if (playback_bufsize[dev] > 128)
1635                 playback_bufsize[dev] = 128;
1636         if (capture_bufsize[dev] < 4)
1637                 capture_bufsize[dev] = 4;
1638         if (capture_bufsize[dev] > 128)
1639                 capture_bufsize[dev] = 128;
1640         if ((err = snd_nm256_create(card, pci,
1641                                     playback_bufsize[dev] * 1024, /* in bytes */
1642                                     capture_bufsize[dev] * 1024,  /* in bytes */
1643                                     force_ac97[dev],
1644                                     xbuffer_top,
1645                                     use_cache[dev],
1646                                     &chip)) < 0) {
1647                 snd_card_free(card);
1648                 return err;
1649         }
1650
1651         if (reset_workaround[dev]) {
1652                 snd_printdd(KERN_INFO "nm256: reset_workaround activated\n");
1653                 chip->reset_workaround = 1;
1654         }
1655
1656         if ((err = snd_nm256_pcm(chip, 0)) < 0 ||
1657             (err = snd_nm256_mixer(chip)) < 0) {
1658                 snd_card_free(card);
1659                 return err;
1660         }
1661
1662         sprintf(card->shortname, "NeoMagic %s", card->driver);
1663         sprintf(card->longname, "%s at 0x%lx & 0x%lx, irq %d",
1664                 card->shortname,
1665                 chip->buffer_addr, chip->cport_addr, chip->irq);
1666
1667         if ((err = snd_card_register(card)) < 0) {
1668                 snd_card_free(card);
1669                 return err;
1670         }
1671
1672         pci_set_drvdata(pci, card);
1673         dev++;
1674         return 0;
1675 }
1676
1677 static void __devexit snd_nm256_remove(struct pci_dev *pci)
1678 {
1679         snd_card_free(pci_get_drvdata(pci));
1680         pci_set_drvdata(pci, NULL);
1681 }
1682
1683
1684 static struct pci_driver driver = {
1685         .name = "NeoMagic 256",
1686         .id_table = snd_nm256_ids,
1687         .probe = snd_nm256_probe,
1688         .remove = __devexit_p(snd_nm256_remove),
1689         SND_PCI_PM_CALLBACKS
1690 };
1691
1692
1693 static int __init alsa_card_nm256_init(void)
1694 {
1695         return pci_register_driver(&driver);
1696 }
1697
1698 static void __exit alsa_card_nm256_exit(void)
1699 {
1700         pci_unregister_driver(&driver);
1701 }
1702
1703 module_init(alsa_card_nm256_init)
1704 module_exit(alsa_card_nm256_exit)