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Linux/sound/pci/nm256/nm256.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /* 
  3  * Driver for NeoMagic 256AV and 256ZX chipsets.
  4  * Copyright (c) 2000 by Takashi Iwai <tiwai@suse.de>
  5  *
  6  * Based on nm256_audio.c OSS driver in linux kernel.
  7  * The original author of OSS nm256 driver wishes to remain anonymous,
  8  * so I just put my acknoledgment to him/her here.
  9  * The original author's web page is found at
 10  *      http://www.uglx.org/sony.html
 11  */
 12   
 13 #include <linux/io.h>
 14 #include <linux/delay.h>
 15 #include <linux/interrupt.h>
 16 #include <linux/init.h>
 17 #include <linux/pci.h>
 18 #include <linux/slab.h>
 19 #include <linux/module.h>
 20 #include <linux/mutex.h>
 21 
 22 #include <sound/core.h>
 23 #include <sound/info.h>
 24 #include <sound/control.h>
 25 #include <sound/pcm.h>
 26 #include <sound/ac97_codec.h>
 27 #include <sound/initval.h>
 28 
 29 #define CARD_NAME "NeoMagic 256AV/ZX"
 30 #define DRIVER_NAME "NM256"
 31 
 32 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
 33 MODULE_DESCRIPTION("NeoMagic NM256AV/ZX");
 34 MODULE_LICENSE("GPL");
 35 MODULE_SUPPORTED_DEVICE("{{NeoMagic,NM256AV},"
 36                 "{NeoMagic,NM256ZX}}");
 37 
 38 /*
 39  * some compile conditions.
 40  */
 41 
 42 static int index = SNDRV_DEFAULT_IDX1;  /* Index */
 43 static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */
 44 static int playback_bufsize = 16;
 45 static int capture_bufsize = 16;
 46 static bool force_ac97;                 /* disabled as default */
 47 static int buffer_top;                  /* not specified */
 48 static bool use_cache;                  /* disabled */
 49 static bool vaio_hack;                  /* disabled */
 50 static bool reset_workaround;
 51 static bool reset_workaround_2;
 52 
 53 module_param(index, int, 0444);
 54 MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
 55 module_param(id, charp, 0444);
 56 MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
 57 module_param(playback_bufsize, int, 0444);
 58 MODULE_PARM_DESC(playback_bufsize, "DAC frame size in kB for " CARD_NAME " soundcard.");
 59 module_param(capture_bufsize, int, 0444);
 60 MODULE_PARM_DESC(capture_bufsize, "ADC frame size in kB for " CARD_NAME " soundcard.");
 61 module_param(force_ac97, bool, 0444);
 62 MODULE_PARM_DESC(force_ac97, "Force to use AC97 codec for " CARD_NAME " soundcard.");
 63 module_param(buffer_top, int, 0444);
 64 MODULE_PARM_DESC(buffer_top, "Set the top address of audio buffer for " CARD_NAME " soundcard.");
 65 module_param(use_cache, bool, 0444);
 66 MODULE_PARM_DESC(use_cache, "Enable the cache for coefficient table access.");
 67 module_param(vaio_hack, bool, 0444);
 68 MODULE_PARM_DESC(vaio_hack, "Enable workaround for Sony VAIO notebooks.");
 69 module_param(reset_workaround, bool, 0444);
 70 MODULE_PARM_DESC(reset_workaround, "Enable AC97 RESET workaround for some laptops.");
 71 module_param(reset_workaround_2, bool, 0444);
 72 MODULE_PARM_DESC(reset_workaround_2, "Enable extended AC97 RESET workaround for some other laptops.");
 73 
 74 /* just for backward compatibility */
 75 static bool enable;
 76 module_param(enable, bool, 0444);
 77 
 78 
 79 
 80 /*
 81  * hw definitions
 82  */
 83 
 84 /* The BIOS signature. */
 85 #define NM_SIGNATURE 0x4e4d0000
 86 /* Signature mask. */
 87 #define NM_SIG_MASK 0xffff0000
 88 
 89 /* Size of the second memory area. */
 90 #define NM_PORT2_SIZE 4096
 91 
 92 /* The base offset of the mixer in the second memory area. */
 93 #define NM_MIXER_OFFSET 0x600
 94 
 95 /* The maximum size of a coefficient entry. */
 96 #define NM_MAX_PLAYBACK_COEF_SIZE       0x5000
 97 #define NM_MAX_RECORD_COEF_SIZE         0x1260
 98 
 99 /* The interrupt register. */
100 #define NM_INT_REG 0xa04
101 /* And its bits. */
102 #define NM_PLAYBACK_INT 0x40
103 #define NM_RECORD_INT 0x100
104 #define NM_MISC_INT_1 0x4000
105 #define NM_MISC_INT_2 0x1
106 #define NM_ACK_INT(chip, X) snd_nm256_writew(chip, NM_INT_REG, (X) << 1)
107 
108 /* The AV's "mixer ready" status bit and location. */
109 #define NM_MIXER_STATUS_OFFSET 0xa04
110 #define NM_MIXER_READY_MASK 0x0800
111 #define NM_MIXER_PRESENCE 0xa06
112 #define NM_PRESENCE_MASK 0x0050
113 #define NM_PRESENCE_VALUE 0x0040
114 
115 /*
116  * For the ZX.  It uses the same interrupt register, but it holds 32
117  * bits instead of 16.
118  */
119 #define NM2_PLAYBACK_INT 0x10000
120 #define NM2_RECORD_INT 0x80000
121 #define NM2_MISC_INT_1 0x8
122 #define NM2_MISC_INT_2 0x2
123 #define NM2_ACK_INT(chip, X) snd_nm256_writel(chip, NM_INT_REG, (X))
124 
125 /* The ZX's "mixer ready" status bit and location. */
126 #define NM2_MIXER_STATUS_OFFSET 0xa06
127 #define NM2_MIXER_READY_MASK 0x0800
128 
129 /* The playback registers start from here. */
130 #define NM_PLAYBACK_REG_OFFSET 0x0
131 /* The record registers start from here. */
132 #define NM_RECORD_REG_OFFSET 0x200
133 
134 /* The rate register is located 2 bytes from the start of the register area. */
135 #define NM_RATE_REG_OFFSET 2
136 
137 /* Mono/stereo flag, number of bits on playback, and rate mask. */
138 #define NM_RATE_STEREO 1
139 #define NM_RATE_BITS_16 2
140 #define NM_RATE_MASK 0xf0
141 
142 /* Playback enable register. */
143 #define NM_PLAYBACK_ENABLE_REG (NM_PLAYBACK_REG_OFFSET + 0x1)
144 #define NM_PLAYBACK_ENABLE_FLAG 1
145 #define NM_PLAYBACK_ONESHOT 2
146 #define NM_PLAYBACK_FREERUN 4
147 
148 /* Mutes the audio output. */
149 #define NM_AUDIO_MUTE_REG (NM_PLAYBACK_REG_OFFSET + 0x18)
150 #define NM_AUDIO_MUTE_LEFT 0x8000
151 #define NM_AUDIO_MUTE_RIGHT 0x0080
152 
153 /* Recording enable register. */
154 #define NM_RECORD_ENABLE_REG (NM_RECORD_REG_OFFSET + 0)
155 #define NM_RECORD_ENABLE_FLAG 1
156 #define NM_RECORD_FREERUN 2
157 
158 /* coefficient buffer pointer */
159 #define NM_COEFF_START_OFFSET   0x1c
160 #define NM_COEFF_END_OFFSET     0x20
161 
162 /* DMA buffer offsets */
163 #define NM_RBUFFER_START (NM_RECORD_REG_OFFSET + 0x4)
164 #define NM_RBUFFER_END   (NM_RECORD_REG_OFFSET + 0x10)
165 #define NM_RBUFFER_WMARK (NM_RECORD_REG_OFFSET + 0xc)
166 #define NM_RBUFFER_CURRP (NM_RECORD_REG_OFFSET + 0x8)
167 
168 #define NM_PBUFFER_START (NM_PLAYBACK_REG_OFFSET + 0x4)
169 #define NM_PBUFFER_END   (NM_PLAYBACK_REG_OFFSET + 0x14)
170 #define NM_PBUFFER_WMARK (NM_PLAYBACK_REG_OFFSET + 0xc)
171 #define NM_PBUFFER_CURRP (NM_PLAYBACK_REG_OFFSET + 0x8)
172 
173 struct nm256_stream {
174 
175         struct nm256 *chip;
176         struct snd_pcm_substream *substream;
177         int running;
178         int suspended;
179         
180         u32 buf;        /* offset from chip->buffer */
181         int bufsize;    /* buffer size in bytes */
182         void __iomem *bufptr;           /* mapped pointer */
183         unsigned long bufptr_addr;      /* physical address of the mapped pointer */
184 
185         int dma_size;           /* buffer size of the substream in bytes */
186         int period_size;        /* period size in bytes */
187         int periods;            /* # of periods */
188         int shift;              /* bit shifts */
189         int cur_period;         /* current period # */
190 
191 };
192 
193 struct nm256 {
194         
195         struct snd_card *card;
196 
197         void __iomem *cport;            /* control port */
198         struct resource *res_cport;     /* its resource */
199         unsigned long cport_addr;       /* physical address */
200 
201         void __iomem *buffer;           /* buffer */
202         struct resource *res_buffer;    /* its resource */
203         unsigned long buffer_addr;      /* buffer phyiscal address */
204 
205         u32 buffer_start;               /* start offset from pci resource 0 */
206         u32 buffer_end;                 /* end offset */
207         u32 buffer_size;                /* total buffer size */
208 
209         u32 all_coeff_buf;              /* coefficient buffer */
210         u32 coeff_buf[2];               /* coefficient buffer for each stream */
211 
212         unsigned int coeffs_current: 1; /* coeff. table is loaded? */
213         unsigned int use_cache: 1;      /* use one big coef. table */
214         unsigned int reset_workaround: 1; /* Workaround for some laptops to avoid freeze */
215         unsigned int reset_workaround_2: 1; /* Extended workaround for some other laptops to avoid freeze */
216         unsigned int in_resume: 1;
217 
218         int mixer_base;                 /* register offset of ac97 mixer */
219         int mixer_status_offset;        /* offset of mixer status reg. */
220         int mixer_status_mask;          /* bit mask to test the mixer status */
221 
222         int irq;
223         int irq_acks;
224         irq_handler_t interrupt;
225         int badintrcount;               /* counter to check bogus interrupts */
226         struct mutex irq_mutex;
227 
228         struct nm256_stream streams[2];
229 
230         struct snd_ac97 *ac97;
231         unsigned short *ac97_regs; /* register caches, only for valid regs */
232 
233         struct snd_pcm *pcm;
234 
235         struct pci_dev *pci;
236 
237         spinlock_t reg_lock;
238 
239 };
240 
241 
242 /*
243  * include coefficient table
244  */
245 #include "nm256_coef.c"
246 
247 
248 /*
249  * PCI ids
250  */
251 static const struct pci_device_id snd_nm256_ids[] = {
252         {PCI_VDEVICE(NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO), 0},
253         {PCI_VDEVICE(NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO), 0},
254         {PCI_VDEVICE(NEOMAGIC, PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO), 0},
255         {0,},
256 };
257 
258 MODULE_DEVICE_TABLE(pci, snd_nm256_ids);
259 
260 
261 /*
262  * lowlvel stuffs
263  */
264 
265 static inline u8
266 snd_nm256_readb(struct nm256 *chip, int offset)
267 {
268         return readb(chip->cport + offset);
269 }
270 
271 static inline u16
272 snd_nm256_readw(struct nm256 *chip, int offset)
273 {
274         return readw(chip->cport + offset);
275 }
276 
277 static inline u32
278 snd_nm256_readl(struct nm256 *chip, int offset)
279 {
280         return readl(chip->cport + offset);
281 }
282 
283 static inline void
284 snd_nm256_writeb(struct nm256 *chip, int offset, u8 val)
285 {
286         writeb(val, chip->cport + offset);
287 }
288 
289 static inline void
290 snd_nm256_writew(struct nm256 *chip, int offset, u16 val)
291 {
292         writew(val, chip->cport + offset);
293 }
294 
295 static inline void
296 snd_nm256_writel(struct nm256 *chip, int offset, u32 val)
297 {
298         writel(val, chip->cport + offset);
299 }
300 
301 static inline void
302 snd_nm256_write_buffer(struct nm256 *chip, void *src, int offset, int size)
303 {
304         offset -= chip->buffer_start;
305 #ifdef CONFIG_SND_DEBUG
306         if (offset < 0 || offset >= chip->buffer_size) {
307                 dev_err(chip->card->dev,
308                         "write_buffer invalid offset = %d size = %d\n",
309                            offset, size);
310                 return;
311         }
312 #endif
313         memcpy_toio(chip->buffer + offset, src, size);
314 }
315 
316 /*
317  * coefficient handlers -- what a magic!
318  */
319 
320 static u16
321 snd_nm256_get_start_offset(int which)
322 {
323         u16 offset = 0;
324         while (which-- > 0)
325                 offset += coefficient_sizes[which];
326         return offset;
327 }
328 
329 static void
330 snd_nm256_load_one_coefficient(struct nm256 *chip, int stream, u32 port, int which)
331 {
332         u32 coeff_buf = chip->coeff_buf[stream];
333         u16 offset = snd_nm256_get_start_offset(which);
334         u16 size = coefficient_sizes[which];
335 
336         snd_nm256_write_buffer(chip, coefficients + offset, coeff_buf, size);
337         snd_nm256_writel(chip, port, coeff_buf);
338         /* ???  Record seems to behave differently than playback.  */
339         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
340                 size--;
341         snd_nm256_writel(chip, port + 4, coeff_buf + size);
342 }
343 
344 static void
345 snd_nm256_load_coefficient(struct nm256 *chip, int stream, int number)
346 {
347         /* The enable register for the specified engine.  */
348         u32 poffset = (stream == SNDRV_PCM_STREAM_CAPTURE ?
349                        NM_RECORD_ENABLE_REG : NM_PLAYBACK_ENABLE_REG);
350         u32 addr = NM_COEFF_START_OFFSET;
351 
352         addr += (stream == SNDRV_PCM_STREAM_CAPTURE ?
353                  NM_RECORD_REG_OFFSET : NM_PLAYBACK_REG_OFFSET);
354 
355         if (snd_nm256_readb(chip, poffset) & 1) {
356                 dev_dbg(chip->card->dev,
357                         "NM256: Engine was enabled while loading coefficients!\n");
358                 return;
359         }
360 
361         /* The recording engine uses coefficient values 8-15.  */
362         number &= 7;
363         if (stream == SNDRV_PCM_STREAM_CAPTURE)
364                 number += 8;
365 
366         if (! chip->use_cache) {
367                 snd_nm256_load_one_coefficient(chip, stream, addr, number);
368                 return;
369         }
370         if (! chip->coeffs_current) {
371                 snd_nm256_write_buffer(chip, coefficients, chip->all_coeff_buf,
372                                        NM_TOTAL_COEFF_COUNT * 4);
373                 chip->coeffs_current = 1;
374         } else {
375                 u32 base = chip->all_coeff_buf;
376                 u32 offset = snd_nm256_get_start_offset(number);
377                 u32 end_offset = offset + coefficient_sizes[number];
378                 snd_nm256_writel(chip, addr, base + offset);
379                 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
380                         end_offset--;
381                 snd_nm256_writel(chip, addr + 4, base + end_offset);
382         }
383 }
384 
385 
386 /* The actual rates supported by the card. */
387 static const unsigned int samplerates[8] = {
388         8000, 11025, 16000, 22050, 24000, 32000, 44100, 48000,
389 };
390 static const struct snd_pcm_hw_constraint_list constraints_rates = {
391         .count = ARRAY_SIZE(samplerates), 
392         .list = samplerates,
393         .mask = 0,
394 };
395 
396 /*
397  * return the index of the target rate
398  */
399 static int
400 snd_nm256_fixed_rate(unsigned int rate)
401 {
402         unsigned int i;
403         for (i = 0; i < ARRAY_SIZE(samplerates); i++) {
404                 if (rate == samplerates[i])
405                         return i;
406         }
407         snd_BUG();
408         return 0;
409 }
410 
411 /*
412  * set sample rate and format
413  */
414 static void
415 snd_nm256_set_format(struct nm256 *chip, struct nm256_stream *s,
416                      struct snd_pcm_substream *substream)
417 {
418         struct snd_pcm_runtime *runtime = substream->runtime;
419         int rate_index = snd_nm256_fixed_rate(runtime->rate);
420         unsigned char ratebits = (rate_index << 4) & NM_RATE_MASK;
421 
422         s->shift = 0;
423         if (snd_pcm_format_width(runtime->format) == 16) {
424                 ratebits |= NM_RATE_BITS_16;
425                 s->shift++;
426         }
427         if (runtime->channels > 1) {
428                 ratebits |= NM_RATE_STEREO;
429                 s->shift++;
430         }
431 
432         runtime->rate = samplerates[rate_index];
433 
434         switch (substream->stream) {
435         case SNDRV_PCM_STREAM_PLAYBACK:
436                 snd_nm256_load_coefficient(chip, 0, rate_index); /* 0 = playback */
437                 snd_nm256_writeb(chip,
438                                  NM_PLAYBACK_REG_OFFSET + NM_RATE_REG_OFFSET,
439                                  ratebits);
440                 break;
441         case SNDRV_PCM_STREAM_CAPTURE:
442                 snd_nm256_load_coefficient(chip, 1, rate_index); /* 1 = record */
443                 snd_nm256_writeb(chip,
444                                  NM_RECORD_REG_OFFSET + NM_RATE_REG_OFFSET,
445                                  ratebits);
446                 break;
447         }
448 }
449 
450 /* acquire interrupt */
451 static int snd_nm256_acquire_irq(struct nm256 *chip)
452 {
453         mutex_lock(&chip->irq_mutex);
454         if (chip->irq < 0) {
455                 if (request_irq(chip->pci->irq, chip->interrupt, IRQF_SHARED,
456                                 KBUILD_MODNAME, chip)) {
457                         dev_err(chip->card->dev,
458                                 "unable to grab IRQ %d\n", chip->pci->irq);
459                         mutex_unlock(&chip->irq_mutex);
460                         return -EBUSY;
461                 }
462                 chip->irq = chip->pci->irq;
463         }
464         chip->irq_acks++;
465         mutex_unlock(&chip->irq_mutex);
466         return 0;
467 }
468 
469 /* release interrupt */
470 static void snd_nm256_release_irq(struct nm256 *chip)
471 {
472         mutex_lock(&chip->irq_mutex);
473         if (chip->irq_acks > 0)
474                 chip->irq_acks--;
475         if (chip->irq_acks == 0 && chip->irq >= 0) {
476                 free_irq(chip->irq, chip);
477                 chip->irq = -1;
478         }
479         mutex_unlock(&chip->irq_mutex);
480 }
481 
482 /*
483  * start / stop
484  */
485 
486 /* update the watermark (current period) */
487 static void snd_nm256_pcm_mark(struct nm256 *chip, struct nm256_stream *s, int reg)
488 {
489         s->cur_period++;
490         s->cur_period %= s->periods;
491         snd_nm256_writel(chip, reg, s->buf + s->cur_period * s->period_size);
492 }
493 
494 #define snd_nm256_playback_mark(chip, s) snd_nm256_pcm_mark(chip, s, NM_PBUFFER_WMARK)
495 #define snd_nm256_capture_mark(chip, s)  snd_nm256_pcm_mark(chip, s, NM_RBUFFER_WMARK)
496 
497 static void
498 snd_nm256_playback_start(struct nm256 *chip, struct nm256_stream *s,
499                          struct snd_pcm_substream *substream)
500 {
501         /* program buffer pointers */
502         snd_nm256_writel(chip, NM_PBUFFER_START, s->buf);
503         snd_nm256_writel(chip, NM_PBUFFER_END, s->buf + s->dma_size - (1 << s->shift));
504         snd_nm256_writel(chip, NM_PBUFFER_CURRP, s->buf);
505         snd_nm256_playback_mark(chip, s);
506 
507         /* Enable playback engine and interrupts. */
508         snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG,
509                          NM_PLAYBACK_ENABLE_FLAG | NM_PLAYBACK_FREERUN);
510         /* Enable both channels. */
511         snd_nm256_writew(chip, NM_AUDIO_MUTE_REG, 0x0);
512 }
513 
514 static void
515 snd_nm256_capture_start(struct nm256 *chip, struct nm256_stream *s,
516                         struct snd_pcm_substream *substream)
517 {
518         /* program buffer pointers */
519         snd_nm256_writel(chip, NM_RBUFFER_START, s->buf);
520         snd_nm256_writel(chip, NM_RBUFFER_END, s->buf + s->dma_size);
521         snd_nm256_writel(chip, NM_RBUFFER_CURRP, s->buf);
522         snd_nm256_capture_mark(chip, s);
523 
524         /* Enable playback engine and interrupts. */
525         snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG,
526                          NM_RECORD_ENABLE_FLAG | NM_RECORD_FREERUN);
527 }
528 
529 /* Stop the play engine. */
530 static void
531 snd_nm256_playback_stop(struct nm256 *chip)
532 {
533         /* Shut off sound from both channels. */
534         snd_nm256_writew(chip, NM_AUDIO_MUTE_REG,
535                          NM_AUDIO_MUTE_LEFT | NM_AUDIO_MUTE_RIGHT);
536         /* Disable play engine. */
537         snd_nm256_writeb(chip, NM_PLAYBACK_ENABLE_REG, 0);
538 }
539 
540 static void
541 snd_nm256_capture_stop(struct nm256 *chip)
542 {
543         /* Disable recording engine. */
544         snd_nm256_writeb(chip, NM_RECORD_ENABLE_REG, 0);
545 }
546 
547 static int
548 snd_nm256_playback_trigger(struct snd_pcm_substream *substream, int cmd)
549 {
550         struct nm256 *chip = snd_pcm_substream_chip(substream);
551         struct nm256_stream *s = substream->runtime->private_data;
552         int err = 0;
553 
554         if (snd_BUG_ON(!s))
555                 return -ENXIO;
556 
557         spin_lock(&chip->reg_lock);
558         switch (cmd) {
559         case SNDRV_PCM_TRIGGER_RESUME:
560                 s->suspended = 0;
561                 /* fallthru */
562         case SNDRV_PCM_TRIGGER_START:
563                 if (! s->running) {
564                         snd_nm256_playback_start(chip, s, substream);
565                         s->running = 1;
566                 }
567                 break;
568         case SNDRV_PCM_TRIGGER_SUSPEND:
569                 s->suspended = 1;
570                 /* fallthru */
571         case SNDRV_PCM_TRIGGER_STOP:
572                 if (s->running) {
573                         snd_nm256_playback_stop(chip);
574                         s->running = 0;
575                 }
576                 break;
577         default:
578                 err = -EINVAL;
579                 break;
580         }
581         spin_unlock(&chip->reg_lock);
582         return err;
583 }
584 
585 static int
586 snd_nm256_capture_trigger(struct snd_pcm_substream *substream, int cmd)
587 {
588         struct nm256 *chip = snd_pcm_substream_chip(substream);
589         struct nm256_stream *s = substream->runtime->private_data;
590         int err = 0;
591 
592         if (snd_BUG_ON(!s))
593                 return -ENXIO;
594 
595         spin_lock(&chip->reg_lock);
596         switch (cmd) {
597         case SNDRV_PCM_TRIGGER_START:
598         case SNDRV_PCM_TRIGGER_RESUME:
599                 if (! s->running) {
600                         snd_nm256_capture_start(chip, s, substream);
601                         s->running = 1;
602                 }
603                 break;
604         case SNDRV_PCM_TRIGGER_STOP:
605         case SNDRV_PCM_TRIGGER_SUSPEND:
606                 if (s->running) {
607                         snd_nm256_capture_stop(chip);
608                         s->running = 0;
609                 }
610                 break;
611         default:
612                 err = -EINVAL;
613                 break;
614         }
615         spin_unlock(&chip->reg_lock);
616         return err;
617 }
618 
619 
620 /*
621  * prepare playback/capture channel
622  */
623 static int snd_nm256_pcm_prepare(struct snd_pcm_substream *substream)
624 {
625         struct nm256 *chip = snd_pcm_substream_chip(substream);
626         struct snd_pcm_runtime *runtime = substream->runtime;
627         struct nm256_stream *s = runtime->private_data;
628 
629         if (snd_BUG_ON(!s))
630                 return -ENXIO;
631         s->dma_size = frames_to_bytes(runtime, substream->runtime->buffer_size);
632         s->period_size = frames_to_bytes(runtime, substream->runtime->period_size);
633         s->periods = substream->runtime->periods;
634         s->cur_period = 0;
635 
636         spin_lock_irq(&chip->reg_lock);
637         s->running = 0;
638         snd_nm256_set_format(chip, s, substream);
639         spin_unlock_irq(&chip->reg_lock);
640 
641         return 0;
642 }
643 
644 
645 /*
646  * get the current pointer
647  */
648 static snd_pcm_uframes_t
649 snd_nm256_playback_pointer(struct snd_pcm_substream *substream)
650 {
651         struct nm256 *chip = snd_pcm_substream_chip(substream);
652         struct nm256_stream *s = substream->runtime->private_data;
653         unsigned long curp;
654 
655         if (snd_BUG_ON(!s))
656                 return 0;
657         curp = snd_nm256_readl(chip, NM_PBUFFER_CURRP) - (unsigned long)s->buf;
658         curp %= s->dma_size;
659         return bytes_to_frames(substream->runtime, curp);
660 }
661 
662 static snd_pcm_uframes_t
663 snd_nm256_capture_pointer(struct snd_pcm_substream *substream)
664 {
665         struct nm256 *chip = snd_pcm_substream_chip(substream);
666         struct nm256_stream *s = substream->runtime->private_data;
667         unsigned long curp;
668 
669         if (snd_BUG_ON(!s))
670                 return 0;
671         curp = snd_nm256_readl(chip, NM_RBUFFER_CURRP) - (unsigned long)s->buf;
672         curp %= s->dma_size;    
673         return bytes_to_frames(substream->runtime, curp);
674 }
675 
676 /* Remapped I/O space can be accessible as pointer on i386 */
677 /* This might be changed in the future */
678 #ifndef __i386__
679 /*
680  * silence / copy for playback
681  */
682 static int
683 snd_nm256_playback_silence(struct snd_pcm_substream *substream,
684                            int channel, unsigned long pos, unsigned long count)
685 {
686         struct snd_pcm_runtime *runtime = substream->runtime;
687         struct nm256_stream *s = runtime->private_data;
688 
689         memset_io(s->bufptr + pos, 0, count);
690         return 0;
691 }
692 
693 static int
694 snd_nm256_playback_copy(struct snd_pcm_substream *substream,
695                         int channel, unsigned long pos,
696                         void __user *src, unsigned long count)
697 {
698         struct snd_pcm_runtime *runtime = substream->runtime;
699         struct nm256_stream *s = runtime->private_data;
700 
701         if (copy_from_user_toio(s->bufptr + pos, src, count))
702                 return -EFAULT;
703         return 0;
704 }
705 
706 static int
707 snd_nm256_playback_copy_kernel(struct snd_pcm_substream *substream,
708                                int channel, unsigned long pos,
709                                void *src, unsigned long count)
710 {
711         struct snd_pcm_runtime *runtime = substream->runtime;
712         struct nm256_stream *s = runtime->private_data;
713 
714         memcpy_toio(s->bufptr + pos, src, count);
715         return 0;
716 }
717 
718 /*
719  * copy to user
720  */
721 static int
722 snd_nm256_capture_copy(struct snd_pcm_substream *substream,
723                        int channel, unsigned long pos,
724                        void __user *dst, unsigned long count)
725 {
726         struct snd_pcm_runtime *runtime = substream->runtime;
727         struct nm256_stream *s = runtime->private_data;
728 
729         if (copy_to_user_fromio(dst, s->bufptr + pos, count))
730                 return -EFAULT;
731         return 0;
732 }
733 
734 static int
735 snd_nm256_capture_copy_kernel(struct snd_pcm_substream *substream,
736                               int channel, unsigned long pos,
737                               void *dst, unsigned long count)
738 {
739         struct snd_pcm_runtime *runtime = substream->runtime;
740         struct nm256_stream *s = runtime->private_data;
741 
742         memcpy_fromio(dst, s->bufptr + pos, count);
743         return 0;
744 }
745 
746 #endif /* !__i386__ */
747 
748 
749 /*
750  * update playback/capture watermarks
751  */
752 
753 /* spinlock held! */
754 static void
755 snd_nm256_playback_update(struct nm256 *chip)
756 {
757         struct nm256_stream *s;
758 
759         s = &chip->streams[SNDRV_PCM_STREAM_PLAYBACK];
760         if (s->running && s->substream) {
761                 spin_unlock(&chip->reg_lock);
762                 snd_pcm_period_elapsed(s->substream);
763                 spin_lock(&chip->reg_lock);
764                 snd_nm256_playback_mark(chip, s);
765         }
766 }
767 
768 /* spinlock held! */
769 static void
770 snd_nm256_capture_update(struct nm256 *chip)
771 {
772         struct nm256_stream *s;
773 
774         s = &chip->streams[SNDRV_PCM_STREAM_CAPTURE];
775         if (s->running && s->substream) {
776                 spin_unlock(&chip->reg_lock);
777                 snd_pcm_period_elapsed(s->substream);
778                 spin_lock(&chip->reg_lock);
779                 snd_nm256_capture_mark(chip, s);
780         }
781 }
782 
783 /*
784  * hardware info
785  */
786 static struct snd_pcm_hardware snd_nm256_playback =
787 {
788         .info =                 SNDRV_PCM_INFO_MMAP_IOMEM |SNDRV_PCM_INFO_MMAP_VALID |
789                                 SNDRV_PCM_INFO_INTERLEAVED |
790                                 /*SNDRV_PCM_INFO_PAUSE |*/
791                                 SNDRV_PCM_INFO_RESUME,
792         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
793         .rates =                SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
794         .rate_min =             8000,
795         .rate_max =             48000,
796         .channels_min =         1,
797         .channels_max =         2,
798         .periods_min =          2,
799         .periods_max =          1024,
800         .buffer_bytes_max =     128 * 1024,
801         .period_bytes_min =     256,
802         .period_bytes_max =     128 * 1024,
803 };
804 
805 static struct snd_pcm_hardware snd_nm256_capture =
806 {
807         .info =                 SNDRV_PCM_INFO_MMAP_IOMEM | SNDRV_PCM_INFO_MMAP_VALID |
808                                 SNDRV_PCM_INFO_INTERLEAVED |
809                                 /*SNDRV_PCM_INFO_PAUSE |*/
810                                 SNDRV_PCM_INFO_RESUME,
811         .formats =              SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
812         .rates =                SNDRV_PCM_RATE_KNOT/*24k*/ | SNDRV_PCM_RATE_8000_48000,
813         .rate_min =             8000,
814         .rate_max =             48000,
815         .channels_min =         1,
816         .channels_max =         2,
817         .periods_min =          2,
818         .periods_max =          1024,
819         .buffer_bytes_max =     128 * 1024,
820         .period_bytes_min =     256,
821         .period_bytes_max =     128 * 1024,
822 };
823 
824 
825 /* set dma transfer size */
826 static int snd_nm256_pcm_hw_params(struct snd_pcm_substream *substream,
827                                    struct snd_pcm_hw_params *hw_params)
828 {
829         /* area and addr are already set and unchanged */
830         substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
831         return 0;
832 }
833 
834 /*
835  * open
836  */
837 static void snd_nm256_setup_stream(struct nm256 *chip, struct nm256_stream *s,
838                                    struct snd_pcm_substream *substream,
839                                    struct snd_pcm_hardware *hw_ptr)
840 {
841         struct snd_pcm_runtime *runtime = substream->runtime;
842 
843         s->running = 0;
844         runtime->hw = *hw_ptr;
845         runtime->hw.buffer_bytes_max = s->bufsize;
846         runtime->hw.period_bytes_max = s->bufsize / 2;
847         runtime->dma_area = (void __force *) s->bufptr;
848         runtime->dma_addr = s->bufptr_addr;
849         runtime->dma_bytes = s->bufsize;
850         runtime->private_data = s;
851         s->substream = substream;
852 
853         snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
854                                    &constraints_rates);
855 }
856 
857 static int
858 snd_nm256_playback_open(struct snd_pcm_substream *substream)
859 {
860         struct nm256 *chip = snd_pcm_substream_chip(substream);
861 
862         if (snd_nm256_acquire_irq(chip) < 0)
863                 return -EBUSY;
864         snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_PLAYBACK],
865                                substream, &snd_nm256_playback);
866         return 0;
867 }
868 
869 static int
870 snd_nm256_capture_open(struct snd_pcm_substream *substream)
871 {
872         struct nm256 *chip = snd_pcm_substream_chip(substream);
873 
874         if (snd_nm256_acquire_irq(chip) < 0)
875                 return -EBUSY;
876         snd_nm256_setup_stream(chip, &chip->streams[SNDRV_PCM_STREAM_CAPTURE],
877                                substream, &snd_nm256_capture);
878         return 0;
879 }
880 
881 /*
882  * close - we don't have to do special..
883  */
884 static int
885 snd_nm256_playback_close(struct snd_pcm_substream *substream)
886 {
887         struct nm256 *chip = snd_pcm_substream_chip(substream);
888 
889         snd_nm256_release_irq(chip);
890         return 0;
891 }
892 
893 
894 static int
895 snd_nm256_capture_close(struct snd_pcm_substream *substream)
896 {
897         struct nm256 *chip = snd_pcm_substream_chip(substream);
898 
899         snd_nm256_release_irq(chip);
900         return 0;
901 }
902 
903 /*
904  * create a pcm instance
905  */
906 static const struct snd_pcm_ops snd_nm256_playback_ops = {
907         .open =         snd_nm256_playback_open,
908         .close =        snd_nm256_playback_close,
909         .ioctl =        snd_pcm_lib_ioctl,
910         .hw_params =    snd_nm256_pcm_hw_params,
911         .prepare =      snd_nm256_pcm_prepare,
912         .trigger =      snd_nm256_playback_trigger,
913         .pointer =      snd_nm256_playback_pointer,
914 #ifndef __i386__
915         .copy_user =    snd_nm256_playback_copy,
916         .copy_kernel =  snd_nm256_playback_copy_kernel,
917         .fill_silence = snd_nm256_playback_silence,
918 #endif
919         .mmap =         snd_pcm_lib_mmap_iomem,
920 };
921 
922 static const struct snd_pcm_ops snd_nm256_capture_ops = {
923         .open =         snd_nm256_capture_open,
924         .close =        snd_nm256_capture_close,
925         .ioctl =        snd_pcm_lib_ioctl,
926         .hw_params =    snd_nm256_pcm_hw_params,
927         .prepare =      snd_nm256_pcm_prepare,
928         .trigger =      snd_nm256_capture_trigger,
929         .pointer =      snd_nm256_capture_pointer,
930 #ifndef __i386__
931         .copy_user =    snd_nm256_capture_copy,
932         .copy_kernel =  snd_nm256_capture_copy_kernel,
933 #endif
934         .mmap =         snd_pcm_lib_mmap_iomem,
935 };
936 
937 static int
938 snd_nm256_pcm(struct nm256 *chip, int device)
939 {
940         struct snd_pcm *pcm;
941         int i, err;
942 
943         for (i = 0; i < 2; i++) {
944                 struct nm256_stream *s = &chip->streams[i];
945                 s->bufptr = chip->buffer + (s->buf - chip->buffer_start);
946                 s->bufptr_addr = chip->buffer_addr + (s->buf - chip->buffer_start);
947         }
948 
949         err = snd_pcm_new(chip->card, chip->card->driver, device,
950                           1, 1, &pcm);
951         if (err < 0)
952                 return err;
953 
954         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_nm256_playback_ops);
955         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_nm256_capture_ops);
956 
957         pcm->private_data = chip;
958         pcm->info_flags = 0;
959         chip->pcm = pcm;
960 
961         return 0;
962 }
963 
964 
965 /* 
966  * Initialize the hardware. 
967  */
968 static void
969 snd_nm256_init_chip(struct nm256 *chip)
970 {
971         /* Reset everything. */
972         snd_nm256_writeb(chip, 0x0, 0x11);
973         snd_nm256_writew(chip, 0x214, 0);
974         /* stop sounds.. */
975         //snd_nm256_playback_stop(chip);
976         //snd_nm256_capture_stop(chip);
977 }
978 
979 
980 static irqreturn_t
981 snd_nm256_intr_check(struct nm256 *chip)
982 {
983         if (chip->badintrcount++ > 1000) {
984                 /*
985                  * I'm not sure if the best thing is to stop the card from
986                  * playing or just release the interrupt (after all, we're in
987                  * a bad situation, so doing fancy stuff may not be such a good
988                  * idea).
989                  *
990                  * I worry about the card engine continuing to play noise
991                  * over and over, however--that could become a very
992                  * obnoxious problem.  And we know that when this usually
993                  * happens things are fairly safe, it just means the user's
994                  * inserted a PCMCIA card and someone's spamming us with IRQ 9s.
995                  */
996                 if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
997                         snd_nm256_playback_stop(chip);
998                 if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
999                         snd_nm256_capture_stop(chip);
1000                 chip->badintrcount = 0;
1001                 return IRQ_HANDLED;
1002         }
1003         return IRQ_NONE;
1004 }
1005 
1006 /* 
1007  * Handle a potential interrupt for the device referred to by DEV_ID. 
1008  *
1009  * I don't like the cut-n-paste job here either between the two routines,
1010  * but there are sufficient differences between the two interrupt handlers
1011  * that parameterizing it isn't all that great either.  (Could use a macro,
1012  * I suppose...yucky bleah.)
1013  */
1014 
1015 static irqreturn_t
1016 snd_nm256_interrupt(int irq, void *dev_id)
1017 {
1018         struct nm256 *chip = dev_id;
1019         u16 status;
1020         u8 cbyte;
1021 
1022         status = snd_nm256_readw(chip, NM_INT_REG);
1023 
1024         /* Not ours. */
1025         if (status == 0)
1026                 return snd_nm256_intr_check(chip);
1027 
1028         chip->badintrcount = 0;
1029 
1030         /* Rather boring; check for individual interrupts and process them. */
1031 
1032         spin_lock(&chip->reg_lock);
1033         if (status & NM_PLAYBACK_INT) {
1034                 status &= ~NM_PLAYBACK_INT;
1035                 NM_ACK_INT(chip, NM_PLAYBACK_INT);
1036                 snd_nm256_playback_update(chip);
1037         }
1038 
1039         if (status & NM_RECORD_INT) {
1040                 status &= ~NM_RECORD_INT;
1041                 NM_ACK_INT(chip, NM_RECORD_INT);
1042                 snd_nm256_capture_update(chip);
1043         }
1044 
1045         if (status & NM_MISC_INT_1) {
1046                 status &= ~NM_MISC_INT_1;
1047                 NM_ACK_INT(chip, NM_MISC_INT_1);
1048                 dev_dbg(chip->card->dev, "NM256: Got misc interrupt #1\n");
1049                 snd_nm256_writew(chip, NM_INT_REG, 0x8000);
1050                 cbyte = snd_nm256_readb(chip, 0x400);
1051                 snd_nm256_writeb(chip, 0x400, cbyte | 2);
1052         }
1053 
1054         if (status & NM_MISC_INT_2) {
1055                 status &= ~NM_MISC_INT_2;
1056                 NM_ACK_INT(chip, NM_MISC_INT_2);
1057                 dev_dbg(chip->card->dev, "NM256: Got misc interrupt #2\n");
1058                 cbyte = snd_nm256_readb(chip, 0x400);
1059                 snd_nm256_writeb(chip, 0x400, cbyte & ~2);
1060         }
1061 
1062         /* Unknown interrupt. */
1063         if (status) {
1064                 dev_dbg(chip->card->dev,
1065                         "NM256: Fire in the hole! Unknown status 0x%x\n",
1066                            status);
1067                 /* Pray. */
1068                 NM_ACK_INT(chip, status);
1069         }
1070 
1071         spin_unlock(&chip->reg_lock);
1072         return IRQ_HANDLED;
1073 }
1074 
1075 /*
1076  * Handle a potential interrupt for the device referred to by DEV_ID.
1077  * This handler is for the 256ZX, and is very similar to the non-ZX
1078  * routine.
1079  */
1080 
1081 static irqreturn_t
1082 snd_nm256_interrupt_zx(int irq, void *dev_id)
1083 {
1084         struct nm256 *chip = dev_id;
1085         u32 status;
1086         u8 cbyte;
1087 
1088         status = snd_nm256_readl(chip, NM_INT_REG);
1089 
1090         /* Not ours. */
1091         if (status == 0)
1092                 return snd_nm256_intr_check(chip);
1093 
1094         chip->badintrcount = 0;
1095 
1096         /* Rather boring; check for individual interrupts and process them. */
1097 
1098         spin_lock(&chip->reg_lock);
1099         if (status & NM2_PLAYBACK_INT) {
1100                 status &= ~NM2_PLAYBACK_INT;
1101                 NM2_ACK_INT(chip, NM2_PLAYBACK_INT);
1102                 snd_nm256_playback_update(chip);
1103         }
1104 
1105         if (status & NM2_RECORD_INT) {
1106                 status &= ~NM2_RECORD_INT;
1107                 NM2_ACK_INT(chip, NM2_RECORD_INT);
1108                 snd_nm256_capture_update(chip);
1109         }
1110 
1111         if (status & NM2_MISC_INT_1) {
1112                 status &= ~NM2_MISC_INT_1;
1113                 NM2_ACK_INT(chip, NM2_MISC_INT_1);
1114                 dev_dbg(chip->card->dev, "NM256: Got misc interrupt #1\n");
1115                 cbyte = snd_nm256_readb(chip, 0x400);
1116                 snd_nm256_writeb(chip, 0x400, cbyte | 2);
1117         }
1118 
1119         if (status & NM2_MISC_INT_2) {
1120                 status &= ~NM2_MISC_INT_2;
1121                 NM2_ACK_INT(chip, NM2_MISC_INT_2);
1122                 dev_dbg(chip->card->dev, "NM256: Got misc interrupt #2\n");
1123                 cbyte = snd_nm256_readb(chip, 0x400);
1124                 snd_nm256_writeb(chip, 0x400, cbyte & ~2);
1125         }
1126 
1127         /* Unknown interrupt. */
1128         if (status) {
1129                 dev_dbg(chip->card->dev,
1130                         "NM256: Fire in the hole! Unknown status 0x%x\n",
1131                            status);
1132                 /* Pray. */
1133                 NM2_ACK_INT(chip, status);
1134         }
1135 
1136         spin_unlock(&chip->reg_lock);
1137         return IRQ_HANDLED;
1138 }
1139 
1140 /*
1141  * AC97 interface
1142  */
1143 
1144 /*
1145  * Waits for the mixer to become ready to be written; returns a zero value
1146  * if it timed out.
1147  */
1148 static int
1149 snd_nm256_ac97_ready(struct nm256 *chip)
1150 {
1151         int timeout = 10;
1152         u32 testaddr;
1153         u16 testb;
1154 
1155         testaddr = chip->mixer_status_offset;
1156         testb = chip->mixer_status_mask;
1157 
1158         /* 
1159          * Loop around waiting for the mixer to become ready. 
1160          */
1161         while (timeout-- > 0) {
1162                 if ((snd_nm256_readw(chip, testaddr) & testb) == 0)
1163                         return 1;
1164                 udelay(100);
1165         }
1166         return 0;
1167 }
1168 
1169 /* 
1170  * Initial register values to be written to the AC97 mixer.
1171  * While most of these are identical to the reset values, we do this
1172  * so that we have most of the register contents cached--this avoids
1173  * reading from the mixer directly (which seems to be problematic,
1174  * probably due to ignorance).
1175  */
1176 
1177 struct initialValues {
1178         unsigned short reg;
1179         unsigned short value;
1180 };
1181 
1182 static struct initialValues nm256_ac97_init_val[] =
1183 {
1184         { AC97_MASTER,          0x8000 },
1185         { AC97_HEADPHONE,       0x8000 },
1186         { AC97_MASTER_MONO,     0x8000 },
1187         { AC97_PC_BEEP,         0x8000 },
1188         { AC97_PHONE,           0x8008 },
1189         { AC97_MIC,             0x8000 },
1190         { AC97_LINE,            0x8808 },
1191         { AC97_CD,              0x8808 },
1192         { AC97_VIDEO,           0x8808 },
1193         { AC97_AUX,             0x8808 },
1194         { AC97_PCM,             0x8808 },
1195         { AC97_REC_SEL,         0x0000 },
1196         { AC97_REC_GAIN,        0x0B0B },
1197         { AC97_GENERAL_PURPOSE, 0x0000 },
1198         { AC97_3D_CONTROL,      0x8000 }, 
1199         { AC97_VENDOR_ID1,      0x8384 },
1200         { AC97_VENDOR_ID2,      0x7609 },
1201 };
1202 
1203 static int nm256_ac97_idx(unsigned short reg)
1204 {
1205         int i;
1206         for (i = 0; i < ARRAY_SIZE(nm256_ac97_init_val); i++)
1207                 if (nm256_ac97_init_val[i].reg == reg)
1208                         return i;
1209         return -1;
1210 }
1211 
1212 /*
1213  * some nm256 easily crash when reading from mixer registers
1214  * thus we're treating it as a write-only mixer and cache the
1215  * written values
1216  */
1217 static unsigned short
1218 snd_nm256_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
1219 {
1220         struct nm256 *chip = ac97->private_data;
1221         int idx = nm256_ac97_idx(reg);
1222 
1223         if (idx < 0)
1224                 return 0;
1225         return chip->ac97_regs[idx];
1226 }
1227 
1228 /* 
1229  */
1230 static void
1231 snd_nm256_ac97_write(struct snd_ac97 *ac97,
1232                      unsigned short reg, unsigned short val)
1233 {
1234         struct nm256 *chip = ac97->private_data;
1235         int tries = 2;
1236         int idx = nm256_ac97_idx(reg);
1237         u32 base;
1238 
1239         if (idx < 0)
1240                 return;
1241 
1242         base = chip->mixer_base;
1243 
1244         snd_nm256_ac97_ready(chip);
1245 
1246         /* Wait for the write to take, too. */
1247         while (tries-- > 0) {
1248                 snd_nm256_writew(chip, base + reg, val);
1249                 msleep(1);  /* a little delay here seems better.. */
1250                 if (snd_nm256_ac97_ready(chip)) {
1251                         /* successful write: set cache */
1252                         chip->ac97_regs[idx] = val;
1253                         return;
1254                 }
1255         }
1256         dev_dbg(chip->card->dev, "nm256: ac97 codec not ready..\n");
1257 }
1258 
1259 /* static resolution table */
1260 static const struct snd_ac97_res_table nm256_res_table[] = {
1261         { AC97_MASTER, 0x1f1f },
1262         { AC97_HEADPHONE, 0x1f1f },
1263         { AC97_MASTER_MONO, 0x001f },
1264         { AC97_PC_BEEP, 0x001f },
1265         { AC97_PHONE, 0x001f },
1266         { AC97_MIC, 0x001f },
1267         { AC97_LINE, 0x1f1f },
1268         { AC97_CD, 0x1f1f },
1269         { AC97_VIDEO, 0x1f1f },
1270         { AC97_AUX, 0x1f1f },
1271         { AC97_PCM, 0x1f1f },
1272         { AC97_REC_GAIN, 0x0f0f },
1273         { } /* terminator */
1274 };
1275 
1276 /* initialize the ac97 into a known state */
1277 static void
1278 snd_nm256_ac97_reset(struct snd_ac97 *ac97)
1279 {
1280         struct nm256 *chip = ac97->private_data;
1281 
1282         /* Reset the mixer.  'Tis magic!  */
1283         snd_nm256_writeb(chip, 0x6c0, 1);
1284         if (! chip->reset_workaround) {
1285                 /* Dell latitude LS will lock up by this */
1286                 snd_nm256_writeb(chip, 0x6cc, 0x87);
1287         }
1288         if (! chip->reset_workaround_2) {
1289                 /* Dell latitude CSx will lock up by this */
1290                 snd_nm256_writeb(chip, 0x6cc, 0x80);
1291                 snd_nm256_writeb(chip, 0x6cc, 0x0);
1292         }
1293         if (! chip->in_resume) {
1294                 int i;
1295                 for (i = 0; i < ARRAY_SIZE(nm256_ac97_init_val); i++) {
1296                         /* preload the cache, so as to avoid even a single
1297                          * read of the mixer regs
1298                          */
1299                         snd_nm256_ac97_write(ac97, nm256_ac97_init_val[i].reg,
1300                                              nm256_ac97_init_val[i].value);
1301                 }
1302         }
1303 }
1304 
1305 /* create an ac97 mixer interface */
1306 static int
1307 snd_nm256_mixer(struct nm256 *chip)
1308 {
1309         struct snd_ac97_bus *pbus;
1310         struct snd_ac97_template ac97;
1311         int err;
1312         static struct snd_ac97_bus_ops ops = {
1313                 .reset = snd_nm256_ac97_reset,
1314                 .write = snd_nm256_ac97_write,
1315                 .read = snd_nm256_ac97_read,
1316         };
1317 
1318         chip->ac97_regs = kcalloc(ARRAY_SIZE(nm256_ac97_init_val),
1319                                   sizeof(short), GFP_KERNEL);
1320         if (! chip->ac97_regs)
1321                 return -ENOMEM;
1322 
1323         if ((err = snd_ac97_bus(chip->card, 0, &ops, NULL, &pbus)) < 0)
1324                 return err;
1325 
1326         memset(&ac97, 0, sizeof(ac97));
1327         ac97.scaps = AC97_SCAP_AUDIO; /* we support audio! */
1328         ac97.private_data = chip;
1329         ac97.res_table = nm256_res_table;
1330         pbus->no_vra = 1;
1331         err = snd_ac97_mixer(pbus, &ac97, &chip->ac97);
1332         if (err < 0)
1333                 return err;
1334         if (! (chip->ac97->id & (0xf0000000))) {
1335                 /* looks like an invalid id */
1336                 sprintf(chip->card->mixername, "%s AC97", chip->card->driver);
1337         }
1338         return 0;
1339 }
1340 
1341 /* 
1342  * See if the signature left by the NM256 BIOS is intact; if so, we use
1343  * the associated address as the end of our audio buffer in the video
1344  * RAM.
1345  */
1346 
1347 static int
1348 snd_nm256_peek_for_sig(struct nm256 *chip)
1349 {
1350         /* The signature is located 1K below the end of video RAM.  */
1351         void __iomem *temp;
1352         /* Default buffer end is 5120 bytes below the top of RAM.  */
1353         unsigned long pointer_found = chip->buffer_end - 0x1400;
1354         u32 sig;
1355 
1356         temp = ioremap_nocache(chip->buffer_addr + chip->buffer_end - 0x400, 16);
1357         if (temp == NULL) {
1358                 dev_err(chip->card->dev,
1359                         "Unable to scan for card signature in video RAM\n");
1360                 return -EBUSY;
1361         }
1362 
1363         sig = readl(temp);
1364         if ((sig & NM_SIG_MASK) == NM_SIGNATURE) {
1365                 u32 pointer = readl(temp + 4);
1366 
1367                 /*
1368                  * If it's obviously invalid, don't use it
1369                  */
1370                 if (pointer == 0xffffffff ||
1371                     pointer < chip->buffer_size ||
1372                     pointer > chip->buffer_end) {
1373                         dev_err(chip->card->dev,
1374                                 "invalid signature found: 0x%x\n", pointer);
1375                         iounmap(temp);
1376                         return -ENODEV;
1377                 } else {
1378                         pointer_found = pointer;
1379                         dev_info(chip->card->dev,
1380                                  "found card signature in video RAM: 0x%x\n",
1381                                pointer);
1382                 }
1383         }
1384 
1385         iounmap(temp);
1386         chip->buffer_end = pointer_found;
1387 
1388         return 0;
1389 }
1390 
1391 #ifdef CONFIG_PM_SLEEP
1392 /*
1393  * APM event handler, so the card is properly reinitialized after a power
1394  * event.
1395  */
1396 static int nm256_suspend(struct device *dev)
1397 {
1398         struct snd_card *card = dev_get_drvdata(dev);
1399         struct nm256 *chip = card->private_data;
1400 
1401         snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
1402         snd_ac97_suspend(chip->ac97);
1403         chip->coeffs_current = 0;
1404         return 0;
1405 }
1406 
1407 static int nm256_resume(struct device *dev)
1408 {
1409         struct snd_card *card = dev_get_drvdata(dev);
1410         struct nm256 *chip = card->private_data;
1411         int i;
1412 
1413         /* Perform a full reset on the hardware */
1414         chip->in_resume = 1;
1415 
1416         snd_nm256_init_chip(chip);
1417 
1418         /* restore ac97 */
1419         snd_ac97_resume(chip->ac97);
1420 
1421         for (i = 0; i < 2; i++) {
1422                 struct nm256_stream *s = &chip->streams[i];
1423                 if (s->substream && s->suspended) {
1424                         spin_lock_irq(&chip->reg_lock);
1425                         snd_nm256_set_format(chip, s, s->substream);
1426                         spin_unlock_irq(&chip->reg_lock);
1427                 }
1428         }
1429 
1430         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
1431         chip->in_resume = 0;
1432         return 0;
1433 }
1434 
1435 static SIMPLE_DEV_PM_OPS(nm256_pm, nm256_suspend, nm256_resume);
1436 #define NM256_PM_OPS    &nm256_pm
1437 #else
1438 #define NM256_PM_OPS    NULL
1439 #endif /* CONFIG_PM_SLEEP */
1440 
1441 static int snd_nm256_free(struct nm256 *chip)
1442 {
1443         if (chip->streams[SNDRV_PCM_STREAM_PLAYBACK].running)
1444                 snd_nm256_playback_stop(chip);
1445         if (chip->streams[SNDRV_PCM_STREAM_CAPTURE].running)
1446                 snd_nm256_capture_stop(chip);
1447 
1448         if (chip->irq >= 0)
1449                 free_irq(chip->irq, chip);
1450 
1451         iounmap(chip->cport);
1452         iounmap(chip->buffer);
1453         release_and_free_resource(chip->res_cport);
1454         release_and_free_resource(chip->res_buffer);
1455 
1456         pci_disable_device(chip->pci);
1457         kfree(chip->ac97_regs);
1458         kfree(chip);
1459         return 0;
1460 }
1461 
1462 static int snd_nm256_dev_free(struct snd_device *device)
1463 {
1464         struct nm256 *chip = device->device_data;
1465         return snd_nm256_free(chip);
1466 }
1467 
1468 static int
1469 snd_nm256_create(struct snd_card *card, struct pci_dev *pci,
1470                  struct nm256 **chip_ret)
1471 {
1472         struct nm256 *chip;
1473         int err, pval;
1474         static struct snd_device_ops ops = {
1475                 .dev_free =     snd_nm256_dev_free,
1476         };
1477         u32 addr;
1478 
1479         *chip_ret = NULL;
1480 
1481         if ((err = pci_enable_device(pci)) < 0)
1482                 return err;
1483 
1484         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1485         if (chip == NULL) {
1486                 pci_disable_device(pci);
1487                 return -ENOMEM;
1488         }
1489 
1490         chip->card = card;
1491         chip->pci = pci;
1492         chip->use_cache = use_cache;
1493         spin_lock_init(&chip->reg_lock);
1494         chip->irq = -1;
1495         mutex_init(&chip->irq_mutex);
1496 
1497         /* store buffer sizes in bytes */
1498         chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize = playback_bufsize * 1024;
1499         chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize = capture_bufsize * 1024;
1500 
1501         /* 
1502          * The NM256 has two memory ports.  The first port is nothing
1503          * more than a chunk of video RAM, which is used as the I/O ring
1504          * buffer.  The second port has the actual juicy stuff (like the
1505          * mixer and the playback engine control registers).
1506          */
1507 
1508         chip->buffer_addr = pci_resource_start(pci, 0);
1509         chip->cport_addr = pci_resource_start(pci, 1);
1510 
1511         /* Init the memory port info.  */
1512         /* remap control port (#2) */
1513         chip->res_cport = request_mem_region(chip->cport_addr, NM_PORT2_SIZE,
1514                                              card->driver);
1515         if (chip->res_cport == NULL) {
1516                 dev_err(card->dev, "memory region 0x%lx (size 0x%x) busy\n",
1517                            chip->cport_addr, NM_PORT2_SIZE);
1518                 err = -EBUSY;
1519                 goto __error;
1520         }
1521         chip->cport = ioremap_nocache(chip->cport_addr, NM_PORT2_SIZE);
1522         if (chip->cport == NULL) {
1523                 dev_err(card->dev, "unable to map control port %lx\n",
1524                         chip->cport_addr);
1525                 err = -ENOMEM;
1526                 goto __error;
1527         }
1528 
1529         if (!strcmp(card->driver, "NM256AV")) {
1530                 /* Ok, try to see if this is a non-AC97 version of the hardware. */
1531                 pval = snd_nm256_readw(chip, NM_MIXER_PRESENCE);
1532                 if ((pval & NM_PRESENCE_MASK) != NM_PRESENCE_VALUE) {
1533                         if (! force_ac97) {
1534                                 dev_err(card->dev,
1535                                         "no ac97 is found!\n");
1536                                 dev_err(card->dev,
1537                                         "force the driver to load by passing in the module parameter\n");
1538                                 dev_err(card->dev,
1539                                         " force_ac97=1\n");
1540                                 dev_err(card->dev,
1541                                         "or try sb16, opl3sa2, or cs423x drivers instead.\n");
1542                                 err = -ENXIO;
1543                                 goto __error;
1544                         }
1545                 }
1546                 chip->buffer_end = 2560 * 1024;
1547                 chip->interrupt = snd_nm256_interrupt;
1548                 chip->mixer_status_offset = NM_MIXER_STATUS_OFFSET;
1549                 chip->mixer_status_mask = NM_MIXER_READY_MASK;
1550         } else {
1551                 /* Not sure if there is any relevant detect for the ZX or not.  */
1552                 if (snd_nm256_readb(chip, 0xa0b) != 0)
1553                         chip->buffer_end = 6144 * 1024;
1554                 else
1555                         chip->buffer_end = 4096 * 1024;
1556 
1557                 chip->interrupt = snd_nm256_interrupt_zx;
1558                 chip->mixer_status_offset = NM2_MIXER_STATUS_OFFSET;
1559                 chip->mixer_status_mask = NM2_MIXER_READY_MASK;
1560         }
1561         
1562         chip->buffer_size = chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize +
1563                 chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
1564         if (chip->use_cache)
1565                 chip->buffer_size += NM_TOTAL_COEFF_COUNT * 4;
1566         else
1567                 chip->buffer_size += NM_MAX_PLAYBACK_COEF_SIZE + NM_MAX_RECORD_COEF_SIZE;
1568 
1569         if (buffer_top >= chip->buffer_size && buffer_top < chip->buffer_end)
1570                 chip->buffer_end = buffer_top;
1571         else {
1572                 /* get buffer end pointer from signature */
1573                 if ((err = snd_nm256_peek_for_sig(chip)) < 0)
1574                         goto __error;
1575         }
1576 
1577         chip->buffer_start = chip->buffer_end - chip->buffer_size;
1578         chip->buffer_addr += chip->buffer_start;
1579 
1580         dev_info(card->dev, "Mapping port 1 from 0x%x - 0x%x\n",
1581                chip->buffer_start, chip->buffer_end);
1582 
1583         chip->res_buffer = request_mem_region(chip->buffer_addr,
1584                                               chip->buffer_size,
1585                                               card->driver);
1586         if (chip->res_buffer == NULL) {
1587                 dev_err(card->dev, "buffer 0x%lx (size 0x%x) busy\n",
1588                            chip->buffer_addr, chip->buffer_size);
1589                 err = -EBUSY;
1590                 goto __error;
1591         }
1592         chip->buffer = ioremap_nocache(chip->buffer_addr, chip->buffer_size);
1593         if (chip->buffer == NULL) {
1594                 err = -ENOMEM;
1595                 dev_err(card->dev, "unable to map ring buffer at %lx\n",
1596                         chip->buffer_addr);
1597                 goto __error;
1598         }
1599 
1600         /* set offsets */
1601         addr = chip->buffer_start;
1602         chip->streams[SNDRV_PCM_STREAM_PLAYBACK].buf = addr;
1603         addr += chip->streams[SNDRV_PCM_STREAM_PLAYBACK].bufsize;
1604         chip->streams[SNDRV_PCM_STREAM_CAPTURE].buf = addr;
1605         addr += chip->streams[SNDRV_PCM_STREAM_CAPTURE].bufsize;
1606         if (chip->use_cache) {
1607                 chip->all_coeff_buf = addr;
1608         } else {
1609                 chip->coeff_buf[SNDRV_PCM_STREAM_PLAYBACK] = addr;
1610                 addr += NM_MAX_PLAYBACK_COEF_SIZE;
1611                 chip->coeff_buf[SNDRV_PCM_STREAM_CAPTURE] = addr;
1612         }
1613 
1614         /* Fixed setting. */
1615         chip->mixer_base = NM_MIXER_OFFSET;
1616 
1617         chip->coeffs_current = 0;
1618 
1619         snd_nm256_init_chip(chip);
1620 
1621         // pci_set_master(pci); /* needed? */
1622         
1623         if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0)
1624                 goto __error;
1625 
1626         *chip_ret = chip;
1627         return 0;
1628 
1629 __error:
1630         snd_nm256_free(chip);
1631         return err;
1632 }
1633 
1634 
1635 enum { NM_BLACKLISTED, NM_RESET_WORKAROUND, NM_RESET_WORKAROUND_2 };
1636 
1637 static struct snd_pci_quirk nm256_quirks[] = {
1638         /* HP omnibook 4150 has cs4232 codec internally */
1639         SND_PCI_QUIRK(0x103c, 0x0007, "HP omnibook 4150", NM_BLACKLISTED),
1640         /* Reset workarounds to avoid lock-ups */
1641         SND_PCI_QUIRK(0x104d, 0x8041, "Sony PCG-F305", NM_RESET_WORKAROUND),
1642         SND_PCI_QUIRK(0x1028, 0x0080, "Dell Latitude LS", NM_RESET_WORKAROUND),
1643         SND_PCI_QUIRK(0x1028, 0x0091, "Dell Latitude CSx", NM_RESET_WORKAROUND_2),
1644         { } /* terminator */
1645 };
1646 
1647 
1648 static int snd_nm256_probe(struct pci_dev *pci,
1649                            const struct pci_device_id *pci_id)
1650 {
1651         struct snd_card *card;
1652         struct nm256 *chip;
1653         int err;
1654         const struct snd_pci_quirk *q;
1655 
1656         q = snd_pci_quirk_lookup(pci, nm256_quirks);
1657         if (q) {
1658                 dev_dbg(&pci->dev, "Enabled quirk for %s.\n",
1659                             snd_pci_quirk_name(q));
1660                 switch (q->value) {
1661                 case NM_BLACKLISTED:
1662                         dev_info(&pci->dev,
1663                                  "The device is blacklisted. Loading stopped\n");
1664                         return -ENODEV;
1665                 case NM_RESET_WORKAROUND_2:
1666                         reset_workaround_2 = 1;
1667                         /* Fall-through */
1668                 case NM_RESET_WORKAROUND:
1669                         reset_workaround = 1;
1670                         break;
1671                 }
1672         }
1673 
1674         err = snd_card_new(&pci->dev, index, id, THIS_MODULE, 0, &card);
1675         if (err < 0)
1676                 return err;
1677 
1678         switch (pci->device) {
1679         case PCI_DEVICE_ID_NEOMAGIC_NM256AV_AUDIO:
1680                 strcpy(card->driver, "NM256AV");
1681                 break;
1682         case PCI_DEVICE_ID_NEOMAGIC_NM256ZX_AUDIO:
1683                 strcpy(card->driver, "NM256ZX");
1684                 break;
1685         case PCI_DEVICE_ID_NEOMAGIC_NM256XL_PLUS_AUDIO:
1686                 strcpy(card->driver, "NM256XL+");
1687                 break;
1688         default:
1689                 dev_err(&pci->dev, "invalid device id 0x%x\n", pci->device);
1690                 snd_card_free(card);
1691                 return -EINVAL;
1692         }
1693 
1694         if (vaio_hack)
1695                 buffer_top = 0x25a800;  /* this avoids conflicts with XFree86 server */
1696 
1697         if (playback_bufsize < 4)
1698                 playback_bufsize = 4;
1699         if (playback_bufsize > 128)
1700                 playback_bufsize = 128;
1701         if (capture_bufsize < 4)
1702                 capture_bufsize = 4;
1703         if (capture_bufsize > 128)
1704                 capture_bufsize = 128;
1705         if ((err = snd_nm256_create(card, pci, &chip)) < 0) {
1706                 snd_card_free(card);
1707                 return err;
1708         }
1709         card->private_data = chip;
1710 
1711         if (reset_workaround) {
1712                 dev_dbg(&pci->dev, "reset_workaround activated\n");
1713                 chip->reset_workaround = 1;
1714         }
1715 
1716         if (reset_workaround_2) {
1717                 dev_dbg(&pci->dev, "reset_workaround_2 activated\n");
1718                 chip->reset_workaround_2 = 1;
1719         }
1720 
1721         if ((err = snd_nm256_pcm(chip, 0)) < 0 ||
1722             (err = snd_nm256_mixer(chip)) < 0) {
1723                 snd_card_free(card);
1724                 return err;
1725         }
1726 
1727         sprintf(card->shortname, "NeoMagic %s", card->driver);
1728         sprintf(card->longname, "%s at 0x%lx & 0x%lx, irq %d",
1729                 card->shortname,
1730                 chip->buffer_addr, chip->cport_addr, chip->irq);
1731 
1732         if ((err = snd_card_register(card)) < 0) {
1733                 snd_card_free(card);
1734                 return err;
1735         }
1736 
1737         pci_set_drvdata(pci, card);
1738         return 0;
1739 }
1740 
1741 static void snd_nm256_remove(struct pci_dev *pci)
1742 {
1743         snd_card_free(pci_get_drvdata(pci));
1744 }
1745 
1746 
1747 static struct pci_driver nm256_driver = {
1748         .name = KBUILD_MODNAME,
1749         .id_table = snd_nm256_ids,
1750         .probe = snd_nm256_probe,
1751         .remove = snd_nm256_remove,
1752         .driver = {
1753                 .pm = NM256_PM_OPS,
1754         },
1755 };
1756 
1757 module_pci_driver(nm256_driver);
1758 

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