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Linux/sound/pci/nm256/nm256.c

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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 <linux/io.h>
 28 #include <linux/delay.h>
 29 #include <linux/interrupt.h>
 30 #include <linux/init.h>
 31 #include <linux/pci.h>
 32 #include <linux/slab.h>
 33 #include <linux/module.h>
 34 #include <linux/mutex.h>
 35 
 36 #include <sound/core.h>
 37 #include <sound/info.h>
 38 #include <sound/control.h>
 39 #include <sound/pcm.h>
 40 #include <sound/ac97_codec.h>
 41 #include <sound/initval.h>
 42 
 43 #define CARD_NAME "NeoMagic 256AV/ZX"
 44 #define DRIVER_NAME "NM256"
 45 
 46 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
 47 MODULE_DESCRIPTION("NeoMagic NM256AV/ZX");
 48 MODULE_LICENSE("GPL");
 49 MODULE_SUPPORTED_DEVICE("{{NeoMagic,NM256AV},"
 50                 "{NeoMagic,NM256ZX}}");
 51 
 52 /*
 53  * some compile conditions.
 54  */
 55 
 56 static int index = SNDRV_DEFAULT_IDX1;  /* Index */
 57 static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */
 58 static int playback_bufsize = 16;
 59 static int capture_bufsize = 16;
 60 static bool force_ac97;                 /* disabled as default */
 61 static int buffer_top;                  /* not specified */
 62 static bool use_cache;                  /* disabled */
 63 static bool vaio_hack;                  /* disabled */
 64 static bool reset_workaround;
 65 static bool reset_workaround_2;
 66 
 67 module_param(index, int, 0444);
 68 MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
 69 module_param(id, charp, 0444);
 70 MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
 71 module_param(playback_bufsize, int, 0444);
 72 MODULE_PARM_DESC(playback_bufsize, "DAC frame size in kB for " CARD_NAME " soundcard.");
 73 module_param(capture_bufsize, int, 0444);
 74 MODULE_PARM_DESC(capture_bufsize, "ADC frame size in kB for " CARD_NAME " soundcard.");
 75 module_param(force_ac97, bool, 0444);
 76 MODULE_PARM_DESC(force_ac97, "Force to use AC97 codec for " CARD_NAME " soundcard.");
 77 module_param(buffer_top, int, 0444);
 78 MODULE_PARM_DESC(buffer_top, "Set the top address of audio buffer for " CARD_NAME " soundcard.");
 79 module_param(use_cache, bool, 0444);
 80 MODULE_PARM_DESC(use_cache, "Enable the cache for coefficient table access.");
 81 module_param(vaio_hack, bool, 0444);
 82 MODULE_PARM_DESC(vaio_hack, "Enable workaround for Sony VAIO notebooks.");
 83 module_param(reset_workaround, bool, 0444);
 84 MODULE_PARM_DESC(reset_workaround, "Enable AC97 RESET workaround for some laptops.");
 85 module_param(reset_workaround_2, bool, 0444);
 86 MODULE_PARM_DESC(reset_workaround_2, "Enable extended AC97 RESET workaround for some other laptops.");
 87 
 88 /* just for backward compatibility */
 89 static bool enable;
 90 module_param(enable, bool, 0444);
 91 
 92 
 93 
 94 /*
 95  * hw definitions
 96  */
 97 
 98 /* The BIOS signature. */
 99 #define NM_SIGNATURE 0x4e4d0000
100 /* Signature mask. */
101 #define NM_SIG_MASK 0xffff0000
102 
103 /* Size of the second memory area. */
104 #define NM_PORT2_SIZE 4096
105 
106 /* The base offset of the mixer in the second memory area. */
107 #define NM_MIXER_OFFSET 0x600
108 
109 /* The maximum size of a coefficient entry. */
110 #define NM_MAX_PLAYBACK_COEF_SIZE       0x5000
111 #define NM_MAX_RECORD_COEF_SIZE         0x1260
112 
113 /* The interrupt register. */
114 #define NM_INT_REG 0xa04
115 /* And its bits. */
116 #define NM_PLAYBACK_INT 0x40
117 #define NM_RECORD_INT 0x100
118 #define NM_MISC_INT_1 0x4000
119 #define NM_MISC_INT_2 0x1
120 #define NM_ACK_INT(chip, X) snd_nm256_writew(chip, NM_INT_REG, (X) << 1)
121 
122 /* The AV's "mixer ready" status bit and location. */
123 #define NM_MIXER_STATUS_OFFSET 0xa04
124 #define NM_MIXER_READY_MASK 0x0800
125 #define NM_MIXER_PRESENCE 0xa06
126 #define NM_PRESENCE_MASK 0x0050
127 #define NM_PRESENCE_VALUE 0x0040
128 
129 /*
130  * For the ZX.  It uses the same interrupt register, but it holds 32
131  * bits instead of 16.
132  */
133 #define NM2_PLAYBACK_INT 0x10000
134 #define NM2_RECORD_INT 0x80000
135 #define NM2_MISC_INT_1 0x8
136 #define NM2_MISC_INT_2 0x2
137 #define NM2_ACK_INT(chip, X) snd_nm256_writel(chip, NM_INT_REG, (X))
138 
139 /* The ZX's "mixer ready" status bit and location. */
140 #define NM2_MIXER_STATUS_OFFSET 0xa06
141 #define NM2_MIXER_READY_MASK 0x0800
142 
143 /* The playback registers start from here. */
144 #define NM_PLAYBACK_REG_OFFSET 0x0
145 /* The record registers start from here. */
146 #define NM_RECORD_REG_OFFSET 0x200
147 
148 /* The rate register is located 2 bytes from the start of the register area. */
149 #define NM_RATE_REG_OFFSET 2
150 
151 /* Mono/stereo flag, number of bits on playback, and rate mask. */
152 #define NM_RATE_STEREO 1
153 #define NM_RATE_BITS_16 2
154 #define NM_RATE_MASK 0xf0
155 
156 /* Playback enable register. */
157 #define NM_PLAYBACK_ENABLE_REG (NM_PLAYBACK_REG_OFFSET + 0x1)
158 #define NM_PLAYBACK_ENABLE_FLAG 1
159 #define NM_PLAYBACK_ONESHOT 2
160 #define NM_PLAYBACK_FREERUN 4
161 
162 /* Mutes the audio output. */
163 #define NM_AUDIO_MUTE_REG (NM_PLAYBACK_REG_OFFSET + 0x18)
164 #define NM_AUDIO_MUTE_LEFT 0x8000
165 #define NM_AUDIO_MUTE_RIGHT 0x0080
166 
167 /* Recording enable register. */
168 #define NM_RECORD_ENABLE_REG (NM_RECORD_REG_OFFSET + 0)
169 #define NM_RECORD_ENABLE_FLAG 1
170 #define NM_RECORD_FREERUN 2
171 
172 /* coefficient buffer pointer */
173 #define NM_COEFF_START_OFFSET   0x1c
174 #define NM_COEFF_END_OFFSET     0x20
175 
176 /* DMA buffer offsets */
177 #define NM_RBUFFER_START (NM_RECORD_REG_OFFSET + 0x4)
178 #define NM_RBUFFER_END   (NM_RECORD_REG_OFFSET + 0x10)
179 #define NM_RBUFFER_WMARK (NM_RECORD_REG_OFFSET + 0xc)
180 #define NM_RBUFFER_CURRP (NM_RECORD_REG_OFFSET + 0x8)
181 
182 #define NM_PBUFFER_START (NM_PLAYBACK_REG_OFFSET + 0x4)
183 #define NM_PBUFFER_END   (NM_PLAYBACK_REG_OFFSET + 0x14)
184 #define NM_PBUFFER_WMARK (NM_PLAYBACK_REG_OFFSET + 0xc)
185 #define NM_PBUFFER_CURRP (NM_PLAYBACK_REG_OFFSET + 0x8)
186 
187 struct nm256_stream {
188 
189         struct nm256 *chip;
190         struct snd_pcm_substream *substream;
191         int running;
192         int suspended;
193         
194         u32 buf;        /* offset from chip->buffer */
195         int bufsize;    /* buffer size in bytes */
196         void __iomem *bufptr;           /* mapped pointer */
197         unsigned long bufptr_addr;      /* physical address of the mapped pointer */
198 
199         int dma_size;           /* buffer size of the substream in bytes */
200         int period_size;        /* period size in bytes */
201         int periods;            /* # of periods */
202         int shift;              /* bit shifts */
203         int cur_period;         /* current period # */
204 
205 };
206 
207 struct nm256 {
208         
209         struct snd_card *card;
210 
211         void __iomem *cport;            /* control port */
212         struct resource *res_cport;     /* its resource */
213         unsigned long cport_addr;       /* physical address */
214 
215         void __iomem *buffer;           /* buffer */
216         struct resource *res_buffer;    /* its resource */
217         unsigned long buffer_addr;      /* buffer phyiscal address */
218 
219         u32 buffer_start;               /* start offset from pci resource 0 */
220         u32 buffer_end;                 /* end offset */
221         u32 buffer_size;                /* total buffer size */
222 
223         u32 all_coeff_buf;              /* coefficient buffer */
224         u32 coeff_buf[2];               /* coefficient buffer for each stream */
225 
226         unsigned int coeffs_current: 1; /* coeff. table is loaded? */
227         unsigned int use_cache: 1;      /* use one big coef. table */
228         unsigned int reset_workaround: 1; /* Workaround for some laptops to avoid freeze */
229         unsigned int reset_workaround_2: 1; /* Extended workaround for some other laptops to avoid freeze */
230         unsigned int in_resume: 1;
231 
232         int mixer_base;                 /* register offset of ac97 mixer */
233         int mixer_status_offset;        /* offset of mixer status reg. */
234         int mixer_status_mask;          /* bit mask to test the mixer status */
235 
236         int irq;
237         int irq_acks;
238         irq_handler_t interrupt;
239         int badintrcount;               /* counter to check bogus interrupts */
240         struct mutex irq_mutex;
241 
242         struct nm256_stream streams[2];
243 
244         struct snd_ac97 *ac97;
245         unsigned short *ac97_regs; /* register caches, only for valid regs */
246 
247         struct snd_pcm *pcm;
248 
249         struct pci_dev *pci;
250 
251         spinlock_t reg_lock;
252 
253 };
254 
255 
256 /*
257  * include coefficient table
258  */
259 #include "nm256_coef.c"
260 
261 
262 /*
263  * PCI ids
264  */
265 static const struct pci_device_id snd_nm256_ids[] = {
266         {PCI_VDEVICE(NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO), 0},
267         {PCI_VDEVICE(NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO), 0},
268         {PCI_VDEVICE(NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO), 0},
269         {0,},
270 };
271 
272 MODULE_DEVICE_TABLE(pci, snd_nm256_ids);
273 
274 
275 /*
276  * lowlvel stuffs
277  */
278 
279 static inline u8
280 snd_nm256_readb(struct nm256 *chip, int offset)
281 {
282         return readb(chip->cport + offset);
283 }
284 
285 static inline u16
286 snd_nm256_readw(struct nm256 *chip, int offset)
287 {
288         return readw(chip->cport + offset);
289 }
290 
291 static inline u32
292 snd_nm256_readl(struct nm256 *chip, int offset)
293 {
294         return readl(chip->cport + offset);
295 }
296 
297 static inline void
298 snd_nm256_writeb(struct nm256 *chip, int offset, u8 val)
299 {
300         writeb(val, chip->cport + offset);
301 }
302 
303 static inline void
304 snd_nm256_writew(struct nm256 *chip, int offset, u16 val)
305 {
306         writew(val, chip->cport + offset);
307 }
308 
309 static inline void
310 snd_nm256_writel(struct nm256 *chip, int offset, u32 val)
311 {
312         writel(val, chip->cport + offset);
313 }
314 
315 static inline void
316 snd_nm256_write_buffer(struct nm256 *chip, void *src, int offset, int size)
317 {
318         offset -= chip->buffer_start;
319 #ifdef CONFIG_SND_DEBUG
320         if (offset < 0 || offset >= chip->buffer_size) {
321                 dev_err(chip->card->dev,
322                         "write_buffer invalid offset = %d size = %d\n",
323                            offset, size);
324                 return;
325         }
326 #endif
327         memcpy_toio(chip->buffer + offset, src, size);
328 }
329 
330 /*
331  * coefficient handlers -- what a magic!
332  */
333 
334 static u16
335 snd_nm256_get_start_offset(int which)
336 {
337         u16 offset = 0;
338         while (which-- > 0)
339                 offset += coefficient_sizes[which];
340         return offset;
341 }
342 
343 static void
344 snd_nm256_load_one_coefficient(struct nm256 *chip, int stream, u32 port, int which)
345 {
346         u32 coeff_buf = chip->coeff_buf[stream];
347         u16 offset = snd_nm256_get_start_offset(which);
348         u16 size = coefficient_sizes[which];
349 
350         snd_nm256_write_buffer(chip, coefficients + offset, coeff_buf, size);
351         snd_nm256_writel(chip, port, coeff_buf);
352         /* ???  Record seems to behave differently than playback.  */
353         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
354                 size--;
355         snd_nm256_writel(chip, port + 4, coeff_buf + size);
356 }
357 
358 static void
359 snd_nm256_load_coefficient(struct nm256 *chip, int stream, int number)
360 {
361         /* The enable register for the specified engine.  */
362         u32 poffset = (stream == SNDRV_PCM_STREAM_CAPTURE ?
363                        NM_RECORD_ENABLE_REG : NM_PLAYBACK_ENABLE_REG);
364         u32 addr = NM_COEFF_START_OFFSET;
365 
366         addr += (stream == SNDRV_PCM_STREAM_CAPTURE ?
367                  NM_RECORD_REG_OFFSET : NM_PLAYBACK_REG_OFFSET);
368 
369         if (snd_nm256_readb(chip, poffset) & 1) {
370                 dev_dbg(chip->card->dev,
371                         "NM256: Engine was enabled while loading coefficients!\n");
372                 return;
373         }
374 
375         /* The recording engine uses coefficient values 8-15.  */
376         number &= 7;
377         if (stream == SNDRV_PCM_STREAM_CAPTURE)
378                 number += 8;
379 
380         if (! chip->use_cache) {
381                 snd_nm256_load_one_coefficient(chip, stream, addr, number);
382                 return;
383         }
384         if (! chip->coeffs_current) {
385                 snd_nm256_write_buffer(chip, coefficients, chip->all_coeff_buf,
386                                        NM_TOTAL_COEFF_COUNT * 4);
387                 chip->coeffs_current = 1;
388         } else {
389                 u32 base = chip->all_coeff_buf;
390                 u32 offset = snd_nm256_get_start_offset(number);
391                 u32 end_offset = offset + coefficient_sizes[number];
392                 snd_nm256_writel(chip, addr, base + offset);
393                 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
394                         end_offset--;
395                 snd_nm256_writel(chip, addr + 4, base + end_offset);
396         }
397 }
398 
399 
400 /* The actual rates supported by the card. */
401 static const unsigned int samplerates[8] = {
402         8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000,
403 };
404 static const struct snd_pcm_hw_constraint_list constraints_rates = {
405         .count = ARRAY_SIZE(samplerates), 
406         .list = samplerates,
407         .mask = 0,
408 };
409 
410 /*
411  * return the index of the target rate
412  */
413 static int
414 snd_nm256_fixed_rate(unsigned int rate)
415 {
416         unsigned int i;
417         for (i = 0; i < ARRAY_SIZE(samplerates); i++) {
418                 if (rate == samplerates[i])
419                         return i;
420         }
421         snd_BUG();
422         return 0;
423 }
424 
425 /*
426  * set sample rate and format
427  */
428 static void
429 snd_nm256_set_format(struct nm256 *chip, struct nm256_stream *s,
430                      struct snd_pcm_substream *substream)
431 {
432         struct snd_pcm_runtime *runtime = substream->runtime;
433         int rate_index = snd_nm256_fixed_rate(runtime->rate);
434         unsigned char ratebits = (rate_index << 4) & NM_RATE_MASK;
435 
436         s->shift = 0;
437         if (snd_pcm_format_width(runtime->format) == 16) {
438                 ratebits |= NM_RATE_BITS_16;
439                 s->shift++;
440         }
441         if (runtime->channels > 1) {
442                 ratebits |= NM_RATE_STEREO;
443                 s->shift++;
444         }
445 
446         runtime->rate = samplerates[rate_index];
447 
448         switch (substream->stream) {
449         case SNDRV_PCM_STREAM_PLAYBACK:
450                 snd_nm256_load_coefficient(chip, 0, rate_index); /* 0 = playback */
451                 snd_nm256_writeb(chip,
452                                  NM_PLAYBACK_REG_OFFSET + NM_RATE_REG_OFFSET,
453                                  ratebits);
454                 break;
455         case SNDRV_PCM_STREAM_CAPTURE:
456                 snd_nm256_load_coefficient(chip, 1, rate_index); /* 1 = record */
457                 snd_nm256_writeb(chip,
458                                  NM_RECORD_REG_OFFSET + NM_RATE_REG_OFFSET,
459                                  ratebits);
460                 break;
461         }
462 }
463 
464 /* acquire interrupt */
465 static int snd_nm256_acquire_irq(struct nm256 *chip)
466 {
467         mutex_lock(&chip->irq_mutex);
468         if (chip->irq < 0) {
469                 if (request_irq(chip->pci->irq, chip->interrupt, IRQF_SHARED,
470                                 KBUILD_MODNAME, chip)) {
471                         dev_err(chip->card->dev,
472                                 "unable to grab IRQ %d\n", chip->pci->irq);
473                         mutex_unlock(&chip->irq_mutex);
474                         return -EBUSY;
475                 }
476                 chip->irq = chip->pci->irq;
477         }
478         chip->irq_acks++;
479         mutex_unlock(&chip->irq_mutex);
480         return 0;
481 }
482 
483 /* release interrupt */
484 static void snd_nm256_release_irq(struct nm256 *chip)
485 {
486         mutex_lock(&chip->irq_mutex);
487         if (chip->irq_acks > 0)
488                 chip->irq_acks--;
489         if (chip->irq_acks == 0 && chip->irq >= 0) {
490                 free_irq(chip->irq, chip);
491                 chip->irq = -1;
492         }
493         mutex_unlock(&chip->irq_mutex);
494 }
495 
496 /*
497  * start / stop
498  */
499 
500 /* update the watermark (current period) */
501 static void snd_nm256_pcm_mark(struct nm256 *chip, struct nm256_stream *s, int reg)
502 {
503         s->cur_period++;
504         s->cur_period %= s->periods;
505         snd_nm256_writel(chip, reg, s->buf + s->cur_period * s->period_size);
506 }
507 
508 #define snd_nm256_playback_mark(chip, s) snd_nm256_pcm_mark(chip, s, NM_PBUFFER_WMARK)
509 #define snd_nm256_capture_mark(chip, s)  snd_nm256_pcm_mark(chip, s, NM_RBUFFER_WMARK)
510 
511 static void
512 snd_nm256_playback_start(struct nm256 *chip, struct nm256_stream *s,
513                          struct snd_pcm_substream *substream)
514 {
515         /* program buffer pointers */
516         snd_nm256_writel(chip, NM_PBUFFER_START, s->buf);
517         snd_nm256_writel(chip, NM_PBUFFER_END, s->buf + s->dma_size - (1 << s->shift));
518         snd_nm256_writel(chip, NM_PBUFFER_CURRP, s->buf);
519         snd_nm256_playback_mark(chip, s);
520 
521         /* Enable playback engine and interrupts. */
522         snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG,
523                          NM_PLAYBACK_ENABLE_FLAG | NM_PLAYBACK_FREERUN);
524         /* Enable both channels. */
525         snd_nm256_writew(chip, NM_AUDIO_MUTE_REG, 0x0);
526 }
527 
528 static void
529 snd_nm256_capture_start(struct nm256 *chip, struct nm256_stream *s,
530                         struct snd_pcm_substream *substream)
531 {
532         /* program buffer pointers */
533         snd_nm256_writel(chip, NM_RBUFFER_START, s->buf);
534         snd_nm256_writel(chip, NM_RBUFFER_END, s->buf + s->dma_size);
535         snd_nm256_writel(chip, NM_RBUFFER_CURRP, s->buf);
536         snd_nm256_capture_mark(chip, s);
537 
538         /* Enable playback engine and interrupts. */
539         snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG,
540                          NM_RECORD_ENABLE_FLAG | NM_RECORD_FREERUN);
541 }
542 
543 /* Stop the play engine. */
544 static void
545 snd_nm256_playback_stop(struct nm256 *chip)
546 {
547         /* Shut off sound from both channels. */
548         snd_nm256_writew(chip, NM_AUDIO_MUTE_REG,
549                          NM_AUDIO_MUTE_LEFT | NM_AUDIO_MUTE_RIGHT);
550         /* Disable play engine. */
551         snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG, 0);
552 }
553 
554 static void
555 snd_nm256_capture_stop(struct nm256 *chip)
556 {
557         /* Disable recording engine. */
558         snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG, 0);
559 }
560 
561 static int
562 snd_nm256_playback_trigger(struct snd_pcm_substream *substream, int cmd)
563 {
564         struct nm256 *chip = snd_pcm_substream_chip(substream);
565         struct nm256_stream *s = substream->runtime->private_data;
566         int err = 0;
567 
568         if (snd_BUG_ON(!s))
569                 return -ENXIO;
570 
571         spin_lock(&chip->reg_lock);
572         switch (cmd) {
573         case SNDRV_PCM_TRIGGER_RESUME:
574                 s->suspended = 0;
575                 /* fallthru */
576         case SNDRV_PCM_TRIGGER_START:
577                 if (! s->running) {
578                         snd_nm256_playback_start(chip, s, substream);
579                         s->running = 1;
580                 }
581                 break;
582         case SNDRV_PCM_TRIGGER_SUSPEND:
583                 s->suspended = 1;
584                 /* fallthru */
585         case SNDRV_PCM_TRIGGER_STOP:
586                 if (s->running) {
587                         snd_nm256_playback_stop(chip);
588                         s->running = 0;
589                 }
590                 break;
591         default:
592                 err = -EINVAL;
593                 break;
594         }
595         spin_unlock(&chip->reg_lock);
596         return err;
597 }
598 
599 static int
600 snd_nm256_capture_trigger(struct snd_pcm_substream *substream, int cmd)
601 {
602         struct nm256 *chip = snd_pcm_substream_chip(substream);
603         struct nm256_stream *s = substream->runtime->private_data;
604         int err = 0;
605 
606         if (snd_BUG_ON(!s))
607                 return -ENXIO;
608 
609         spin_lock(&chip->reg_lock);
610         switch (cmd) {
611         case SNDRV_PCM_TRIGGER_START:
612         case SNDRV_PCM_TRIGGER_RESUME:
613                 if (! s->running) {
614                         snd_nm256_capture_start(chip, s, substream);
615                         s->running = 1;
616                 }
617                 break;
618         case SNDRV_PCM_TRIGGER_STOP:
619         case SNDRV_PCM_TRIGGER_SUSPEND:
620                 if (s->running) {
621                         snd_nm256_capture_stop(chip);
622                         s->running = 0;
623                 }
624                 break;
625         default:
626                 err = -EINVAL;
627                 break;
628         }
629         spin_unlock(&chip->reg_lock);
630         return err;
631 }
632 
633 
634 /*
635  * prepare playback/capture channel
636  */
637 static int snd_nm256_pcm_prepare(struct snd_pcm_substream *substream)
638 {
639         struct nm256 *chip = snd_pcm_substream_chip(substream);
640         struct snd_pcm_runtime *runtime = substream->runtime;
641         struct nm256_stream *s = runtime->private_data;
642 
643         if (snd_BUG_ON(!s))
644                 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(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_PBUFFER_CURRP) - (unsigned long)s->buf;
672         curp %= s->dma_size;
673         return bytes_to_frames(substream->runtime, curp);
674 }
675 
676 static snd_pcm_uframes_t
677 snd_nm256_capture_pointer(struct snd_pcm_substream *substream)
678 {
679         struct nm256 *chip = snd_pcm_substream_chip(substream);
680         struct nm256_stream *s = substream->runtime->private_data;
681         unsigned long curp;
682 
683         if (snd_BUG_ON(!s))
684                 return 0;
685         curp = snd_nm256_readl(chip, NM_RBUFFER_CURRP) - (unsigned long)s->buf;
686         curp %= s->dma_size;    
687         return bytes_to_frames(substream->runtime, curp);
688 }
689 
690 /* Remapped I/O space can be accessible as pointer on i386 */
691 /* This might be changed in the future */
692 #ifndef __i386__
693 /*
694  * silence / copy for playback
695  */
696 static int
697 snd_nm256_playback_silence(struct snd_pcm_substream *substream,
698                            int channel, unsigned long pos, unsigned long count)
699 {
700         struct snd_pcm_runtime *runtime = substream->runtime;
701         struct nm256_stream *s = runtime->private_data;
702 
703         memset_io(s->bufptr + pos, 0, count);
704         return 0;
705 }
706 
707 static int
708 snd_nm256_playback_copy(struct snd_pcm_substream *substream,
709                         int channel, unsigned long pos,
710                         void __user *src, unsigned long count)
711 {
712         struct snd_pcm_runtime *runtime = substream->runtime;
713         struct nm256_stream *s = runtime->private_data;
714 
715         if (copy_from_user_toio(s->bufptr + pos, src, count))
716                 return -EFAULT;
717         return 0;
718 }
719 
720 static int
721 snd_nm256_playback_copy_kernel(struct snd_pcm_substream *substream,
722                                int channel, unsigned long pos,
723                                void *src, unsigned long count)
724 {
725         struct snd_pcm_runtime *runtime = substream->runtime;
726         struct nm256_stream *s = runtime->private_data;
727 
728         memcpy_toio(s->bufptr + pos, src, count);
729         return 0;
730 }
731 
732 /*
733  * copy to user
734  */
735 static int
736 snd_nm256_capture_copy(struct snd_pcm_substream *substream,
737                        int channel, unsigned long pos,
738                        void __user *dst, unsigned long count)
739 {
740         struct snd_pcm_runtime *runtime = substream->runtime;
741         struct nm256_stream *s = runtime->private_data;
742 
743         if (copy_to_user_fromio(dst, s->bufptr + pos, count))
744                 return -EFAULT;
745         return 0;
746 }
747 
748 static int
749 snd_nm256_capture_copy_kernel(struct snd_pcm_substream *substream,
750                               int channel, unsigned long pos,
751                               void *dst, unsigned long count)
752 {
753         struct snd_pcm_runtime *runtime = substream->runtime;
754         struct nm256_stream *s = runtime->private_data;
755 
756         memcpy_fromio(dst, s->bufptr + pos, count);
757         return 0;
758 }
759 
760 #endif /* !__i386__ */
761 
762 
763 /*
764  * update playback/capture watermarks
765  */
766 
767 /* spinlock held! */
768 static void
769 snd_nm256_playback_update(struct nm256 *chip)
770 {
771         struct nm256_stream *s;
772 
773         s = &chip->streams[SNDRV_PCM_STREAM_PLAYBACK];
774         if (s->running && s->substream) {
775                 spin_unlock(&chip->reg_lock);
776                 snd_pcm_period_elapsed(s->substream);
777                 spin_lock(&chip->reg_lock);
778                 snd_nm256_playback_mark(chip, s);
779         }
780 }
781 
782 /* spinlock held! */
783 static void
784 snd_nm256_capture_update(struct nm256 *chip)
785 {
786         struct nm256_stream *s;
787 
788         s = &chip->streams[SNDRV_PCM_STREAM_CAPTURE];
789         if (s->running && s->substream) {
790                 spin_unlock(&chip->reg_lock);
791                 snd_pcm_period_elapsed(s->substream);
792                 spin_lock(&chip->reg_lock);
793                 snd_nm256_capture_mark(chip, s);
794         }
795 }
796 
797 /*
798  * hardware info
799  */
800 static struct snd_pcm_hardware snd_nm256_playback =
801 {
802         .info =                 SNDRV_PCM_INFO_MMAP_IOMEM |SNDRV_PCM_INFO_MMAP_VALID |
803                                 SNDRV_PCM_INFO_INTERLEAVED |
804                                 /*SNDRV_PCM_INFO_PAUSE |*/
805                                 SNDRV_PCM_INFO_RESUME,
806         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
807         .rates =                SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
808         .rate_min =             8000,
809         .rate_max =             48000,
810         .channels_min =         1,
811         .channels_max =         2,
812         .periods_min =          2,
813         .periods_max =          1024,
814         .buffer_bytes_max =     128 * 1024,
815         .period_bytes_min =     256,
816         .period_bytes_max =     128 * 1024,
817 };
818 
819 static struct snd_pcm_hardware snd_nm256_capture =
820 {
821         .info =                 SNDRV_PCM_INFO_MMAP_IOMEM | SNDRV_PCM_INFO_MMAP_VALID |
822                                 SNDRV_PCM_INFO_INTERLEAVED |
823                                 /*SNDRV_PCM_INFO_PAUSE |*/
824                                 SNDRV_PCM_INFO_RESUME,
825         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
826         .rates =                SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
827         .rate_min =             8000,
828         .rate_max =             48000,
829         .channels_min =         1,
830         .channels_max =         2,
831         .periods_min =          2,
832         .periods_max =          1024,
833         .buffer_bytes_max =     128 * 1024,
834         .period_bytes_min =     256,
835         .period_bytes_max =     128 * 1024,
836 };
837 
838 
839 /* set dma transfer size */
840 static int snd_nm256_pcm_hw_params(struct snd_pcm_substream *substream,
841                                    struct snd_pcm_hw_params *hw_params)
842 {
843         /* area and addr are already set and unchanged */
844         substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
845         return 0;
846 }
847 
848 /*
849  * open
850  */
851 static void snd_nm256_setup_stream(struct nm256 *chip, struct nm256_stream *s,
852                                    struct snd_pcm_substream *substream,
853                                    struct snd_pcm_hardware *hw_ptr)
854 {
855         struct snd_pcm_runtime *runtime = substream->runtime;
856 
857         s->running = 0;
858         runtime->hw = *hw_ptr;
859         runtime->hw.buffer_bytes_max = s->bufsize;
860         runtime->hw.period_bytes_max = s->bufsize / 2;
861         runtime->dma_area = (void __force *) s->bufptr;
862         runtime->dma_addr = s->bufptr_addr;
863         runtime->dma_bytes = s->bufsize;
864         runtime->private_data = s;
865         s->substream = substream;
866 
867         snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
868                                    &constraints_rates);
869 }
870 
871 static int
872 snd_nm256_playback_open(struct snd_pcm_substream *substream)
873 {
874         struct nm256 *chip = snd_pcm_substream_chip(substream);
875 
876         if (snd_nm256_acquire_irq(chip) < 0)
877                 return -EBUSY;
878         snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_PLAYBACK],
879                                substream, &snd_nm256_playback);
880         return 0;
881 }
882 
883 static int
884 snd_nm256_capture_open(struct snd_pcm_substream *substream)
885 {
886         struct nm256 *chip = snd_pcm_substream_chip(substream);
887 
888         if (snd_nm256_acquire_irq(chip) < 0)
889                 return -EBUSY;
890         snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_CAPTURE],
891                                substream, &snd_nm256_capture);
892         return 0;
893 }
894 
895 /*
896  * close - we don't have to do special..
897  */
898 static int
899 snd_nm256_playback_close(struct snd_pcm_substream *substream)
900 {
901         struct nm256 *chip = snd_pcm_substream_chip(substream);
902 
903         snd_nm256_release_irq(chip);
904         return 0;
905 }
906 
907 
908 static int
909 snd_nm256_capture_close(struct snd_pcm_substream *substream)
910 {
911         struct nm256 *chip = snd_pcm_substream_chip(substream);
912 
913         snd_nm256_release_irq(chip);
914         return 0;
915 }
916 
917 /*
918  * create a pcm instance
919  */
920 static const struct snd_pcm_ops snd_nm256_playback_ops = {
921         .open =         snd_nm256_playback_open,
922         .close =        snd_nm256_playback_close,
923         .ioctl =        snd_pcm_lib_ioctl,
924         .hw_params =    snd_nm256_pcm_hw_params,
925         .prepare =      snd_nm256_pcm_prepare,
926         .trigger =      snd_nm256_playback_trigger,
927         .pointer =      snd_nm256_playback_pointer,
928 #ifndef __i386__
929         .copy_user =    snd_nm256_playback_copy,
930         .copy_kernel =  snd_nm256_playback_copy_kernel,
931         .fill_silence = snd_nm256_playback_silence,
932 #endif
933         .mmap =         snd_pcm_lib_mmap_iomem,
934 };
935 
936 static const struct snd_pcm_ops snd_nm256_capture_ops = {
937         .open =         snd_nm256_capture_open,
938         .close =        snd_nm256_capture_close,
939         .ioctl =        snd_pcm_lib_ioctl,
940         .hw_params =    snd_nm256_pcm_hw_params,
941         .prepare =      snd_nm256_pcm_prepare,
942         .trigger =      snd_nm256_capture_trigger,
943         .pointer =      snd_nm256_capture_pointer,
944 #ifndef __i386__
945         .copy_user =    snd_nm256_capture_copy,
946         .copy_kernel =  snd_nm256_capture_copy_kernel,
947 #endif
948         .mmap =         snd_pcm_lib_mmap_iomem,
949 };
950 
951 static int
952 snd_nm256_pcm(struct nm256 *chip, int device)
953 {
954         struct snd_pcm *pcm;
955         int i, err;
956 
957         for (i = 0; i < 2; i++) {
958                 struct nm256_stream *s = &chip->streams[i];
959                 s->bufptr = chip->buffer + (s->buf - chip->buffer_start);
960                 s->bufptr_addr = chip->buffer_addr + (s->buf - chip->buffer_start);
961         }
962 
963         err = snd_pcm_new(chip->card, chip->card->driver, device,
964                           1, 1, &pcm);
965         if (err < 0)
966                 return err;
967 
968         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_nm256_playback_ops);
969         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_nm256_capture_ops);
970 
971         pcm->private_data = chip;
972         pcm->info_flags = 0;
973         chip->pcm = pcm;
974 
975         return 0;
976 }
977 
978 
979 /* 
980  * Initialize the hardware. 
981  */
982 static void
983 snd_nm256_init_chip(struct nm256 *chip)
984 {
985         /* Reset everything. */
986         snd_nm256_writeb(chip, 0x0, 0x11);
987         snd_nm256_writew(chip, 0x214, 0);
988         /* stop sounds.. */
989         //snd_nm256_playback_stop(chip);
990         //snd_nm256_capture_stop(chip);
991 }
992 
993 
994 static irqreturn_t
995 snd_nm256_intr_check(struct nm256 *chip)
996 {
997         if (chip->badintrcount++ > 1000) {
998                 /*
999                  * I'm not sure if the best thing is to stop the card from
1000                  * playing or just release the interrupt (after all, we're in
1001                  * a bad situation, so doing fancy stuff may not be such a good
1002                  * idea).
1003                  *
1004                  * I worry about the card engine continuing to play noise
1005                  * over and over, however--that could become a very
1006                  * obnoxious problem.  And we know that when this usually
1007                  * happens things are fairly safe, it just means the user's
1008                  * inserted a PCMCIA card and someone's spamming us with IRQ 9s.
1009                  */
1010                 if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
1011                         snd_nm256_playback_stop(chip);
1012                 if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
1013                         snd_nm256_capture_stop(chip);
1014                 chip->badintrcount = 0;
1015                 return IRQ_HANDLED;
1016         }
1017         return IRQ_NONE;
1018 }
1019 
1020 /* 
1021  * Handle a potential interrupt for the device referred to by DEV_ID. 
1022  *
1023  * I don't like the cut-n-paste job here either between the two routines,
1024  * but there are sufficient differences between the two interrupt handlers
1025  * that parameterizing it isn't all that great either.  (Could use a macro,
1026  * I suppose...yucky bleah.)
1027  */
1028 
1029 static irqreturn_t
1030 snd_nm256_interrupt(int irq, void *dev_id)
1031 {
1032         struct nm256 *chip = dev_id;
1033         u16 status;
1034         u8 cbyte;
1035 
1036         status = snd_nm256_readw(chip, NM_INT_REG);
1037 
1038         /* Not ours. */
1039         if (status == 0)
1040                 return snd_nm256_intr_check(chip);
1041 
1042         chip->badintrcount = 0;
1043 
1044         /* Rather boring; check for individual interrupts and process them. */
1045 
1046         spin_lock(&chip->reg_lock);
1047         if (status & NM_PLAYBACK_INT) {
1048                 status &= ~NM_PLAYBACK_INT;
1049                 NM_ACK_INT(chip, NM_PLAYBACK_INT);
1050                 snd_nm256_playback_update(chip);
1051         }
1052 
1053         if (status & NM_RECORD_INT) {
1054                 status &= ~NM_RECORD_INT;
1055                 NM_ACK_INT(chip, NM_RECORD_INT);
1056                 snd_nm256_capture_update(chip);
1057         }
1058 
1059         if (status & NM_MISC_INT_1) {
1060                 status &= ~NM_MISC_INT_1;
1061                 NM_ACK_INT(chip, NM_MISC_INT_1);
1062                 dev_dbg(chip->card->dev, "NM256: Got misc interrupt #1\n");
1063                 snd_nm256_writew(chip, NM_INT_REG, 0x8000);
1064                 cbyte = snd_nm256_readb(chip, 0x400);
1065                 snd_nm256_writeb(chip, 0x400, cbyte | 2);
1066         }
1067 
1068         if (status & NM_MISC_INT_2) {
1069                 status &= ~NM_MISC_INT_2;
1070                 NM_ACK_INT(chip, NM_MISC_INT_2);
1071                 dev_dbg(chip->card->dev, "NM256: Got misc interrupt #2\n");
1072                 cbyte = snd_nm256_readb(chip, 0x400);
1073                 snd_nm256_writeb(chip, 0x400, cbyte & ~2);
1074         }
1075 
1076         /* Unknown interrupt. */
1077         if (status) {
1078                 dev_dbg(chip->card->dev,
1079                         "NM256: Fire in the hole! Unknown status 0x%x\n",
1080                            status);
1081                 /* Pray. */
1082                 NM_ACK_INT(chip, status);
1083         }
1084 
1085         spin_unlock(&chip->reg_lock);
1086         return IRQ_HANDLED;
1087 }
1088 
1089 /*
1090  * Handle a potential interrupt for the device referred to by DEV_ID.
1091  * This handler is for the 256ZX, and is very similar to the non-ZX
1092  * routine.
1093  */
1094 
1095 static irqreturn_t
1096 snd_nm256_interrupt_zx(int irq, void *dev_id)
1097 {
1098         struct nm256 *chip = dev_id;
1099         u32 status;
1100         u8 cbyte;
1101 
1102         status = snd_nm256_readl(chip, NM_INT_REG);
1103 
1104         /* Not ours. */
1105         if (status == 0)
1106                 return snd_nm256_intr_check(chip);
1107 
1108         chip->badintrcount = 0;
1109 
1110         /* Rather boring; check for individual interrupts and process them. */
1111 
1112         spin_lock(&chip->reg_lock);
1113         if (status & NM2_PLAYBACK_INT) {
1114                 status &= ~NM2_PLAYBACK_INT;
1115                 NM2_ACK_INT(chip, NM2_PLAYBACK_INT);
1116                 snd_nm256_playback_update(chip);
1117         }
1118 
1119         if (status & NM2_RECORD_INT) {
1120                 status &= ~NM2_RECORD_INT;
1121                 NM2_ACK_INT(chip, NM2_RECORD_INT);
1122                 snd_nm256_capture_update(chip);
1123         }
1124 
1125         if (status & NM2_MISC_INT_1) {
1126                 status &= ~NM2_MISC_INT_1;
1127                 NM2_ACK_INT(chip, NM2_MISC_INT_1);
1128                 dev_dbg(chip->card->dev, "NM256: Got misc interrupt #1\n");
1129                 cbyte = snd_nm256_readb(chip, 0x400);
1130                 snd_nm256_writeb(chip, 0x400, cbyte | 2);
1131         }
1132 
1133         if (status & NM2_MISC_INT_2) {
1134                 status &= ~NM2_MISC_INT_2;
1135                 NM2_ACK_INT(chip, NM2_MISC_INT_2);
1136                 dev_dbg(chip->card->dev, "NM256: Got misc interrupt #2\n");
1137                 cbyte = snd_nm256_readb(chip, 0x400);
1138                 snd_nm256_writeb(chip, 0x400, cbyte & ~2);
1139         }
1140 
1141         /* Unknown interrupt. */
1142         if (status) {
1143                 dev_dbg(chip->card->dev,
1144                         "NM256: Fire in the hole! Unknown status 0x%x\n",
1145                            status);
1146                 /* Pray. */
1147                 NM2_ACK_INT(chip, status);
1148         }
1149 
1150         spin_unlock(&chip->reg_lock);
1151         return IRQ_HANDLED;
1152 }
1153 
1154 /*
1155  * AC97 interface
1156  */
1157 
1158 /*
1159  * Waits for the mixer to become ready to be written; returns a zero value
1160  * if it timed out.
1161  */
1162 static int
1163 snd_nm256_ac97_ready(struct nm256 *chip)
1164 {
1165         int timeout = 10;
1166         u32 testaddr;
1167         u16 testb;
1168 
1169         testaddr = chip->mixer_status_offset;
1170         testb = chip->mixer_status_mask;
1171 
1172         /* 
1173          * Loop around waiting for the mixer to become ready. 
1174          */
1175         while (timeout-- > 0) {
1176                 if ((snd_nm256_readw(chip, testaddr) & testb) == 0)
1177                         return 1;
1178                 udelay(100);
1179         }
1180         return 0;
1181 }
1182 
1183 /* 
1184  * Initial register values to be written to the AC97 mixer.
1185  * While most of these are identical to the reset values, we do this
1186  * so that we have most of the register contents cached--this avoids
1187  * reading from the mixer directly (which seems to be problematic,
1188  * probably due to ignorance).
1189  */
1190 
1191 struct initialValues {
1192         unsigned short reg;
1193         unsigned short value;
1194 };
1195 
1196 static struct initialValues nm256_ac97_init_val[] =
1197 {
1198         { AC97_MASTER,          0x8000 },
1199         { AC97_HEADPHONE,       0x8000 },
1200         { AC97_MASTER_MONO,     0x8000 },
1201         { AC97_PC_BEEP,         0x8000 },
1202         { AC97_PHONE,           0x8008 },
1203         { AC97_MIC,             0x8000 },
1204         { AC97_LINE,            0x8808 },
1205         { AC97_CD,              0x8808 },
1206         { AC97_VIDEO,           0x8808 },
1207         { AC97_AUX,             0x8808 },
1208         { AC97_PCM,             0x8808 },
1209         { AC97_REC_SEL,         0x0000 },
1210         { AC97_REC_GAIN,        0x0B0B },
1211         { AC97_GENERAL_PURPOSE, 0x0000 },
1212         { AC97_3D_CONTROL,      0x8000 }, 
1213         { AC97_VENDOR_ID1,      0x8384 },
1214         { AC97_VENDOR_ID2,      0x7609 },
1215 };
1216 
1217 static int nm256_ac97_idx(unsigned short reg)
1218 {
1219         int i;
1220         for (i = 0; i < ARRAY_SIZE(nm256_ac97_init_val); i++)
1221                 if (nm256_ac97_init_val[i].reg == reg)
1222                         return i;
1223         return -1;
1224 }
1225 
1226 /*
1227  * some nm256 easily crash when reading from mixer registers
1228  * thus we're treating it as a write-only mixer and cache the
1229  * written values
1230  */
1231 static unsigned short
1232 snd_nm256_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
1233 {
1234         struct nm256 *chip = ac97->private_data;
1235         int idx = nm256_ac97_idx(reg);
1236 
1237         if (idx < 0)
1238                 return 0;
1239         return chip->ac97_regs[idx];
1240 }
1241 
1242 /* 
1243  */
1244 static void
1245 snd_nm256_ac97_write(struct snd_ac97 *ac97,
1246                      unsigned short reg, unsigned short val)
1247 {
1248         struct nm256 *chip = ac97->private_data;
1249         int tries = 2;
1250         int idx = nm256_ac97_idx(reg);
1251         u32 base;
1252 
1253         if (idx < 0)
1254                 return;
1255 
1256         base = chip->mixer_base;
1257 
1258         snd_nm256_ac97_ready(chip);
1259 
1260         /* Wait for the write to take, too. */
1261         while (tries-- > 0) {
1262                 snd_nm256_writew(chip, base + reg, val);
1263                 msleep(1);  /* a little delay here seems better.. */
1264                 if (snd_nm256_ac97_ready(chip)) {
1265                         /* successful write: set cache */
1266                         chip->ac97_regs[idx] = val;
1267                         return;
1268                 }
1269         }
1270         dev_dbg(chip->card->dev, "nm256: ac97 codec not ready..\n");
1271 }
1272 
1273 /* static resolution table */
1274 static const struct snd_ac97_res_table nm256_res_table[] = {
1275         { AC97_MASTER, 0x1f1f },
1276         { AC97_HEADPHONE, 0x1f1f },
1277         { AC97_MASTER_MONO, 0x001f },
1278         { AC97_PC_BEEP, 0x001f },
1279         { AC97_PHONE, 0x001f },
1280         { AC97_MIC, 0x001f },
1281         { AC97_LINE, 0x1f1f },
1282         { AC97_CD, 0x1f1f },
1283         { AC97_VIDEO, 0x1f1f },
1284         { AC97_AUX, 0x1f1f },
1285         { AC97_PCM, 0x1f1f },
1286         { AC97_REC_GAIN, 0x0f0f },
1287         { } /* terminator */
1288 };
1289 
1290 /* initialize the ac97 into a known state */
1291 static void
1292 snd_nm256_ac97_reset(struct snd_ac97 *ac97)
1293 {
1294         struct nm256 *chip = ac97->private_data;
1295 
1296         /* Reset the mixer.  'Tis magic!  */
1297         snd_nm256_writeb(chip, 0x6c0, 1);
1298         if (! chip->reset_workaround) {
1299                 /* Dell latitude LS will lock up by this */
1300                 snd_nm256_writeb(chip, 0x6cc, 0x87);
1301         }
1302         if (! chip->reset_workaround_2) {
1303                 /* Dell latitude CSx will lock up by this */
1304                 snd_nm256_writeb(chip, 0x6cc, 0x80);
1305                 snd_nm256_writeb(chip, 0x6cc, 0x0);
1306         }
1307         if (! chip->in_resume) {
1308                 int i;
1309                 for (i = 0; i < ARRAY_SIZE(nm256_ac97_init_val); i++) {
1310                         /* preload the cache, so as to avoid even a single
1311                          * read of the mixer regs
1312                          */
1313                         snd_nm256_ac97_write(ac97, nm256_ac97_init_val[i].reg,
1314                                              nm256_ac97_init_val[i].value);
1315                 }
1316         }
1317 }
1318 
1319 /* create an ac97 mixer interface */
1320 static int
1321 snd_nm256_mixer(struct nm256 *chip)
1322 {
1323         struct snd_ac97_bus *pbus;
1324         struct snd_ac97_template ac97;
1325         int err;
1326         static struct snd_ac97_bus_ops ops = {
1327                 .reset = snd_nm256_ac97_reset,
1328                 .write = snd_nm256_ac97_write,
1329                 .read = snd_nm256_ac97_read,
1330         };
1331 
1332         chip->ac97_regs = kcalloc(ARRAY_SIZE(nm256_ac97_init_val),
1333                                   sizeof(short), GFP_KERNEL);
1334         if (! chip->ac97_regs)
1335                 return -ENOMEM;
1336 
1337         if ((err = snd_ac97_bus(chip->card, 0, &ops, NULL, &pbus)) < 0)
1338                 return err;
1339 
1340         memset(&ac97, 0, sizeof(ac97));
1341         ac97.scaps = AC97_SCAP_AUDIO; /* we support audio! */
1342         ac97.private_data = chip;
1343         ac97.res_table = nm256_res_table;
1344         pbus->no_vra = 1;
1345         err = snd_ac97_mixer(pbus, &ac97, &chip->ac97);
1346         if (err < 0)
1347                 return err;
1348         if (! (chip->ac97->id & (0xf0000000))) {
1349                 /* looks like an invalid id */
1350                 sprintf(chip->card->mixername, "%s AC97", chip->card->driver);
1351         }
1352         return 0;
1353 }
1354 
1355 /* 
1356  * See if the signature left by the NM256 BIOS is intact; if so, we use
1357  * the associated address as the end of our audio buffer in the video
1358  * RAM.
1359  */
1360 
1361 static int
1362 snd_nm256_peek_for_sig(struct nm256 *chip)
1363 {
1364         /* The signature is located 1K below the end of video RAM.  */
1365         void __iomem *temp;
1366         /* Default buffer end is 5120 bytes below the top of RAM.  */
1367         unsigned long pointer_found = chip->buffer_end - 0x1400;
1368         u32 sig;
1369 
1370         temp = ioremap_nocache(chip->buffer_addr + chip->buffer_end - 0x400, 16);
1371         if (temp == NULL) {
1372                 dev_err(chip->card->dev,
1373                         "Unable to scan for card signature in video RAM\n");
1374                 return -EBUSY;
1375         }
1376 
1377         sig = readl(temp);
1378         if ((sig & NM_SIG_MASK) == NM_SIGNATURE) {
1379                 u32 pointer = readl(temp + 4);
1380 
1381                 /*
1382                  * If it's obviously invalid, don't use it
1383                  */
1384                 if (pointer == 0xffffffff ||
1385                     pointer < chip->buffer_size ||
1386                     pointer > chip->buffer_end) {
1387                         dev_err(chip->card->dev,
1388                                 "invalid signature found: 0x%x\n", pointer);
1389                         iounmap(temp);
1390                         return -ENODEV;
1391                 } else {
1392                         pointer_found = pointer;
1393                         dev_info(chip->card->dev,
1394                                  "found card signature in video RAM: 0x%x\n",
1395                                pointer);
1396                 }
1397         }
1398 
1399         iounmap(temp);
1400         chip->buffer_end = pointer_found;
1401 
1402         return 0;
1403 }
1404 
1405 #ifdef CONFIG_PM_SLEEP
1406 /*
1407  * APM event handler, so the card is properly reinitialized after a power
1408  * event.
1409  */
1410 static int nm256_suspend(struct device *dev)
1411 {
1412         struct snd_card *card = dev_get_drvdata(dev);
1413         struct nm256 *chip = card->private_data;
1414 
1415         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1416         snd_pcm_suspend_all(chip->pcm);
1417         snd_ac97_suspend(chip->ac97);
1418         chip->coeffs_current = 0;
1419         return 0;
1420 }
1421 
1422 static int nm256_resume(struct device *dev)
1423 {
1424         struct snd_card *card = dev_get_drvdata(dev);
1425         struct nm256 *chip = card->private_data;
1426         int i;
1427 
1428         /* Perform a full reset on the hardware */
1429         chip->in_resume = 1;
1430 
1431         snd_nm256_init_chip(chip);
1432 
1433         /* restore ac97 */
1434         snd_ac97_resume(chip->ac97);
1435 
1436         for (i = 0; i < 2; i++) {
1437                 struct nm256_stream *s = &chip->streams[i];
1438                 if (s->substream && s->suspended) {
1439                         spin_lock_irq(&chip->reg_lock);
1440                         snd_nm256_set_format(chip, s, s->substream);
1441                         spin_unlock_irq(&chip->reg_lock);
1442                 }
1443         }
1444 
1445         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1446         chip->in_resume = 0;
1447         return 0;
1448 }
1449 
1450 static SIMPLE_DEV_PM_OPS(nm256_pm, nm256_suspend, nm256_resume);
1451 #define NM256_PM_OPS    &nm256_pm
1452 #else
1453 #define NM256_PM_OPS    NULL
1454 #endif /* CONFIG_PM_SLEEP */
1455 
1456 static int snd_nm256_free(struct nm256 *chip)
1457 {
1458         if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
1459                 snd_nm256_playback_stop(chip);
1460         if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
1461                 snd_nm256_capture_stop(chip);
1462 
1463         if (chip->irq >= 0)
1464                 free_irq(chip->irq, chip);
1465 
1466         iounmap(chip->cport);
1467         iounmap(chip->buffer);
1468         release_and_free_resource(chip->res_cport);
1469         release_and_free_resource(chip->res_buffer);
1470 
1471         pci_disable_device(chip->pci);
1472         kfree(chip->ac97_regs);
1473         kfree(chip);
1474         return 0;
1475 }
1476 
1477 static int snd_nm256_dev_free(struct snd_device *device)
1478 {
1479         struct nm256 *chip = device->device_data;
1480         return snd_nm256_free(chip);
1481 }
1482 
1483 static int
1484 snd_nm256_create(struct snd_card *card, struct pci_dev *pci,
1485                  struct nm256 **chip_ret)
1486 {
1487         struct nm256 *chip;
1488         int err, pval;
1489         static struct snd_device_ops ops = {
1490                 .dev_free =     snd_nm256_dev_free,
1491         };
1492         u32 addr;
1493 
1494         *chip_ret = NULL;
1495 
1496         if ((err = pci_enable_device(pci)) < 0)
1497                 return err;
1498 
1499         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1500         if (chip == NULL) {
1501                 pci_disable_device(pci);
1502                 return -ENOMEM;
1503         }
1504 
1505         chip->card = card;
1506         chip->pci = pci;
1507         chip->use_cache = use_cache;
1508         spin_lock_init(&chip->reg_lock);
1509         chip->irq = -1;
1510         mutex_init(&chip->irq_mutex);
1511 
1512         /* store buffer sizes in bytes */
1513         chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize = playback_bufsize * 1024;
1514         chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize = capture_bufsize * 1024;
1515 
1516         /* 
1517          * The NM256 has two memory ports.  The first port is nothing
1518          * more than a chunk of video RAM, which is used as the I/O ring
1519          * buffer.  The second port has the actual juicy stuff (like the
1520          * mixer and the playback engine control registers).
1521          */
1522 
1523         chip->buffer_addr = pci_resource_start(pci, 0);
1524         chip->cport_addr = pci_resource_start(pci, 1);
1525 
1526         /* Init the memory port info.  */
1527         /* remap control port (#2) */
1528         chip->res_cport = request_mem_region(chip->cport_addr, NM_PORT2_SIZE,
1529                                              card->driver);
1530         if (chip->res_cport == NULL) {
1531                 dev_err(card->dev, "memory region 0x%lx (size 0x%x) busy\n",
1532                            chip->cport_addr, NM_PORT2_SIZE);
1533                 err = -EBUSY;
1534                 goto __error;
1535         }
1536         chip->cport = ioremap_nocache(chip->cport_addr, NM_PORT2_SIZE);
1537         if (chip->cport == NULL) {
1538                 dev_err(card->dev, "unable to map control port %lx\n",
1539                         chip->cport_addr);
1540                 err = -ENOMEM;
1541                 goto __error;
1542         }
1543 
1544         if (!strcmp(card->driver, "NM256AV")) {
1545                 /* Ok, try to see if this is a non-AC97 version of the hardware. */
1546                 pval = snd_nm256_readw(chip, NM_MIXER_PRESENCE);
1547                 if ((pval & NM_PRESENCE_MASK) != NM_PRESENCE_VALUE) {
1548                         if (! force_ac97) {
1549                                 dev_err(card->dev,
1550                                         "no ac97 is found!\n");
1551                                 dev_err(card->dev,
1552                                         "force the driver to load by passing in the module parameter\n");
1553                                 dev_err(card->dev,
1554                                         " force_ac97=1\n");
1555                                 dev_err(card->dev,
1556                                         "or try sb16, opl3sa2, or cs423x drivers instead.\n");
1557                                 err = -ENXIO;
1558                                 goto __error;
1559                         }
1560                 }
1561                 chip->buffer_end = 2560 * 1024;
1562                 chip->interrupt = snd_nm256_interrupt;
1563                 chip->mixer_status_offset = NM_MIXER_STATUS_OFFSET;
1564                 chip->mixer_status_mask = NM_MIXER_READY_MASK;
1565         } else {
1566                 /* Not sure if there is any relevant detect for the ZX or not.  */
1567                 if (snd_nm256_readb(chip, 0xa0b) != 0)
1568                         chip->buffer_end = 6144 * 1024;
1569                 else
1570                         chip->buffer_end = 4096 * 1024;
1571 
1572                 chip->interrupt = snd_nm256_interrupt_zx;
1573                 chip->mixer_status_offset = NM2_MIXER_STATUS_OFFSET;
1574                 chip->mixer_status_mask = NM2_MIXER_READY_MASK;
1575         }
1576         
1577         chip->buffer_size = chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize +
1578                 chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
1579         if (chip->use_cache)
1580                 chip->buffer_size += NM_TOTAL_COEFF_COUNT * 4;
1581         else
1582                 chip->buffer_size += NM_MAX_PLAYBACK_COEF_SIZE + NM_MAX_RECORD_COEF_SIZE;
1583 
1584         if (buffer_top >= chip->buffer_size && buffer_top < chip->buffer_end)
1585                 chip->buffer_end = buffer_top;
1586         else {
1587                 /* get buffer end pointer from signature */
1588                 if ((err = snd_nm256_peek_for_sig(chip)) < 0)
1589                         goto __error;
1590         }
1591 
1592         chip->buffer_start = chip->buffer_end - chip->buffer_size;
1593         chip->buffer_addr += chip->buffer_start;
1594 
1595         dev_info(card->dev, "Mapping port 1 from 0x%x - 0x%x\n",
1596                chip->buffer_start, chip->buffer_end);
1597 
1598         chip->res_buffer = request_mem_region(chip->buffer_addr,
1599                                               chip->buffer_size,
1600                                               card->driver);
1601         if (chip->res_buffer == NULL) {
1602                 dev_err(card->dev, "buffer 0x%lx (size 0x%x) busy\n",
1603                            chip->buffer_addr, chip->buffer_size);
1604                 err = -EBUSY;
1605                 goto __error;
1606         }
1607         chip->buffer = ioremap_nocache(chip->buffer_addr, chip->buffer_size);
1608         if (chip->buffer == NULL) {
1609                 err = -ENOMEM;
1610                 dev_err(card->dev, "unable to map ring buffer at %lx\n",
1611                         chip->buffer_addr);
1612                 goto __error;
1613         }
1614 
1615         /* set offsets */
1616         addr = chip->buffer_start;
1617         chip->streams[SNDRV_PCM_STREAM_PLAYBACK].buf = addr;
1618         addr += chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize;
1619         chip->streams[SNDRV_PCM_STREAM_CAPTURE].buf = addr;
1620         addr += chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
1621         if (chip->use_cache) {
1622                 chip->all_coeff_buf = addr;
1623         } else {
1624                 chip->coeff_buf[SNDRV_PCM_STREAM_PLAYBACK] = addr;
1625                 addr += NM_MAX_PLAYBACK_COEF_SIZE;
1626                 chip->coeff_buf[SNDRV_PCM_STREAM_CAPTURE] = addr;
1627         }
1628 
1629         /* Fixed setting. */
1630         chip->mixer_base = NM_MIXER_OFFSET;
1631 
1632         chip->coeffs_current = 0;
1633 
1634         snd_nm256_init_chip(chip);
1635 
1636         // pci_set_master(pci); /* needed? */
1637         
1638         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0)
1639                 goto __error;
1640 
1641         *chip_ret = chip;
1642         return 0;
1643 
1644 __error:
1645         snd_nm256_free(chip);
1646         return err;
1647 }
1648 
1649 
1650 enum { NM_BLACKLISTED, NM_RESET_WORKAROUND, NM_RESET_WORKAROUND_2 };
1651 
1652 static struct snd_pci_quirk nm256_quirks[] = {
1653         /* HP omnibook 4150 has cs4232 codec internally */
1654         SND_PCI_QUIRK(0x103c, 0x0007, "HP omnibook 4150", NM_BLACKLISTED),
1655         /* Reset workarounds to avoid lock-ups */
1656         SND_PCI_QUIRK(0x104d, 0x8041, "Sony PCG-F305", NM_RESET_WORKAROUND),
1657         SND_PCI_QUIRK(0x1028, 0x0080, "Dell Latitude LS", NM_RESET_WORKAROUND),
1658         SND_PCI_QUIRK(0x1028, 0x0091, "Dell Latitude CSx", NM_RESET_WORKAROUND_2),
1659         { } /* terminator */
1660 };
1661 
1662 
1663 static int snd_nm256_probe(struct pci_dev *pci,
1664                            const struct pci_device_id *pci_id)
1665 {
1666         struct snd_card *card;
1667         struct nm256 *chip;
1668         int err;
1669         const struct snd_pci_quirk *q;
1670 
1671         q = snd_pci_quirk_lookup(pci, nm256_quirks);
1672         if (q) {
1673                 dev_dbg(&pci->dev, "Enabled quirk for %s.\n",
1674                             snd_pci_quirk_name(q));
1675                 switch (q->value) {
1676                 case NM_BLACKLISTED:
1677                         dev_info(&pci->dev,
1678                                  "The device is blacklisted. Loading stopped\n");
1679                         return -ENODEV;
1680                 case NM_RESET_WORKAROUND_2:
1681                         reset_workaround_2 = 1;
1682                         /* Fall-through */
1683                 case NM_RESET_WORKAROUND:
1684                         reset_workaround = 1;
1685                         break;
1686                 }
1687         }
1688 
1689         err = snd_card_new(&pci->dev, index, id, THIS_MODULE, 0, &card);
1690         if (err < 0)
1691                 return err;
1692 
1693         switch (pci->device) {
1694         case PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO:
1695                 strcpy(card->driver, "NM256AV");
1696                 break;
1697         case PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO:
1698                 strcpy(card->driver, "NM256ZX");
1699                 break;
1700         case PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO:
1701                 strcpy(card->driver, "NM256XL+");
1702                 break;
1703         default:
1704                 dev_err(&pci->dev, "invalid device id 0x%x\n", pci->device);
1705                 snd_card_free(card);
1706                 return -EINVAL;
1707         }
1708 
1709         if (vaio_hack)
1710                 buffer_top = 0x25a800;  /* this avoids conflicts with XFree86 server */
1711 
1712         if (playback_bufsize < 4)
1713                 playback_bufsize = 4;
1714         if (playback_bufsize > 128)
1715                 playback_bufsize = 128;
1716         if (capture_bufsize < 4)
1717                 capture_bufsize = 4;
1718         if (capture_bufsize > 128)
1719                 capture_bufsize = 128;
1720         if ((err = snd_nm256_create(card, pci, &chip)) < 0) {
1721                 snd_card_free(card);
1722                 return err;
1723         }
1724         card->private_data = chip;
1725 
1726         if (reset_workaround) {
1727                 dev_dbg(&pci->dev, "reset_workaround activated\n");
1728                 chip->reset_workaround = 1;
1729         }
1730 
1731         if (reset_workaround_2) {
1732                 dev_dbg(&pci->dev, "reset_workaround_2 activated\n");
1733                 chip->reset_workaround_2 = 1;
1734         }
1735 
1736         if ((err = snd_nm256_pcm(chip, 0)) < 0 ||
1737             (err = snd_nm256_mixer(chip)) < 0) {
1738                 snd_card_free(card);
1739                 return err;
1740         }
1741 
1742         sprintf(card->shortname, "NeoMagic %s", card->driver);
1743         sprintf(card->longname, "%s at 0x%lx & 0x%lx, irq %d",
1744                 card->shortname,
1745                 chip->buffer_addr, chip->cport_addr, chip->irq);
1746 
1747         if ((err = snd_card_register(card)) < 0) {
1748                 snd_card_free(card);
1749                 return err;
1750         }
1751 
1752         pci_set_drvdata(pci, card);
1753         return 0;
1754 }
1755 
1756 static void snd_nm256_remove(struct pci_dev *pci)
1757 {
1758         snd_card_free(pci_get_drvdata(pci));
1759 }
1760 
1761 
1762 static struct pci_driver nm256_driver = {
1763         .name = KBUILD_MODNAME,
1764         .id_table = snd_nm256_ids,
1765         .probe = snd_nm256_probe,
1766         .remove = snd_nm256_remove,
1767         .driver = {
1768                 .pm = NM256_PM_OPS,
1769         },
1770 };
1771 
1772 module_pci_driver(nm256_driver);
1773 

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