?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
drm/radeon/kms: remove useless radeon_ddc_dump()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / sound / soc / sh / fsi.c
bloba32fd16ad668dffe65f87e20943e5c6ec985f38b
1 /*
2 * Fifo-attached Serial Interface (FSI) support for SH7724
3 *
4 * Copyright (C) 2009 Renesas Solutions Corp.
5 * Kuninori Morimoto <morimoto.kuninori@renesas.com>
6 *
7 * Based on ssi.c
8 * Copyright (c) 2007 Manuel Lauss <mano@roarinelk.homelinux.net>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/delay.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/io.h>
18 #include <linux/slab.h>
19 #include <sound/soc.h>
20 #include <sound/sh_fsi.h>
21
22 /* PortA/PortB register */
23 #define REG_DO_FMT 0x0000
24 #define REG_DOFF_CTL 0x0004
25 #define REG_DOFF_ST 0x0008
26 #define REG_DI_FMT 0x000C
27 #define REG_DIFF_CTL 0x0010
28 #define REG_DIFF_ST 0x0014
29 #define REG_CKG1 0x0018
30 #define REG_CKG2 0x001C
31 #define REG_DIDT 0x0020
32 #define REG_DODT 0x0024
33 #define REG_MUTE_ST 0x0028
34 #define REG_OUT_SEL 0x0030
35
36 /* master register */
37 #define MST_CLK_RST 0x0210
38 #define MST_SOFT_RST 0x0214
39 #define MST_FIFO_SZ 0x0218
40
41 /* core register (depend on FSI version) */
42 #define A_MST_CTLR 0x0180
43 #define B_MST_CTLR 0x01A0
44 #define CPU_INT_ST 0x01F4
45 #define CPU_IEMSK 0x01F8
46 #define CPU_IMSK 0x01FC
47 #define INT_ST 0x0200
48 #define IEMSK 0x0204
49 #define IMSK 0x0208
50
51 /* DO_FMT */
52 /* DI_FMT */
53 #define CR_BWS_24 (0x0 << 20) /* FSI2 */
54 #define CR_BWS_16 (0x1 << 20) /* FSI2 */
55 #define CR_BWS_20 (0x2 << 20) /* FSI2 */
56
57 #define CR_DTMD_PCM (0x0 << 8) /* FSI2 */
58 #define CR_DTMD_SPDIF_PCM (0x1 << 8) /* FSI2 */
59 #define CR_DTMD_SPDIF_STREAM (0x2 << 8) /* FSI2 */
60
61 #define CR_MONO (0x0 << 4)
62 #define CR_MONO_D (0x1 << 4)
63 #define CR_PCM (0x2 << 4)
64 #define CR_I2S (0x3 << 4)
65 #define CR_TDM (0x4 << 4)
66 #define CR_TDM_D (0x5 << 4)
67
68 /* DOFF_CTL */
69 /* DIFF_CTL */
70 #define IRQ_HALF 0x00100000
71 #define FIFO_CLR 0x00000001
72
73 /* DOFF_ST */
74 #define ERR_OVER 0x00000010
75 #define ERR_UNDER 0x00000001
76 #define ST_ERR (ERR_OVER | ERR_UNDER)
77
78 /* CKG1 */
79 #define ACKMD_MASK 0x00007000
80 #define BPFMD_MASK 0x00000700
81 #define DIMD (1 << 4)
82 #define DOMD (1 << 0)
83
84 /* A/B MST_CTLR */
85 #define BP (1 << 4) /* Fix the signal of Biphase output */
86 #define SE (1 << 0) /* Fix the master clock */
87
88 /* CLK_RST */
89 #define CRB (1 << 4)
90 #define CRA (1 << 0)
91
92 /* IO SHIFT / MACRO */
93 #define BI_SHIFT 12
94 #define BO_SHIFT 8
95 #define AI_SHIFT 4
96 #define AO_SHIFT 0
97 #define AB_IO(param, shift) (param << shift)
98
99 /* SOFT_RST */
100 #define PBSR (1 << 12) /* Port B Software Reset */
101 #define PASR (1 << 8) /* Port A Software Reset */
102 #define IR (1 << 4) /* Interrupt Reset */
103 #define FSISR (1 << 0) /* Software Reset */
104
105 /* OUT_SEL (FSI2) */
106 #define DMMD (1 << 4) /* SPDIF output timing 0: Biphase only */
107 /* 1: Biphase and serial */
108
109 /* FIFO_SZ */
110 #define FIFO_SZ_MASK 0x7
111
112 #define FSI_RATES SNDRV_PCM_RATE_8000_96000
113
114 #define FSI_FMTS (SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S16_LE)
115
116 typedef int (*set_rate_func)(struct device *dev, int is_porta, int rate, int enable);
117
118 /*
119 * FSI driver use below type name for variable
120 *
121 * xxx_num : number of data
122 * xxx_pos : position of data
123 * xxx_capa : capacity of data
124 */
125
126 /*
127 * period/frame/sample image
128 *
129 * ex) PCM (2ch)
130 *
131 * period pos period pos
132 * [n] [n + 1]
133 * |<-------------------- period--------------------->|
134 * ==|============================================ ... =|==
135 * | |
136 * ||<----- frame ----->|<------ frame ----->| ... |
137 * |+--------------------+--------------------+- ... |
138 * ||[ sample ][ sample ]|[ sample ][ sample ]| ... |
139 * |+--------------------+--------------------+- ... |
140 * ==|============================================ ... =|==
141 */
142
143 /*
144 * FSI FIFO image
145 *
146 * | |
147 * | |
148 * | [ sample ] |
149 * | [ sample ] |
150 * | [ sample ] |
151 * | [ sample ] |
152 * --> go to codecs
153 */
154
155 /*
156 * struct
157 */
158
159 struct fsi_stream {
160 struct snd_pcm_substream *substream;
161
162 int fifo_sample_capa; /* sample capacity of FSI FIFO */
163 int buff_sample_capa; /* sample capacity of ALSA buffer */
164 int buff_sample_pos; /* sample position of ALSA buffer */
165 int period_samples; /* sample number / 1 period */
166 int period_pos; /* current period position */
167
168 int uerr_num;
169 int oerr_num;
170 };
171
172 struct fsi_priv {
173 void __iomem *base;
174 struct fsi_master *master;
175
176 struct fsi_stream playback;
177 struct fsi_stream capture;
178
179 u32 do_fmt;
180 u32 di_fmt;
181
182 int chan_num:16;
183 int clk_master:1;
184 int spdif:1;
185
186 long rate;
187 };
188
189 struct fsi_core {
190 int ver;
191
192 u32 int_st;
193 u32 iemsk;
194 u32 imsk;
195 u32 a_mclk;
196 u32 b_mclk;
197 };
198
199 struct fsi_master {
200 void __iomem *base;
201 int irq;
202 struct fsi_priv fsia;
203 struct fsi_priv fsib;
204 struct fsi_core *core;
205 struct sh_fsi_platform_info *info;
206 spinlock_t lock;
207 };
208
209 /*
210 * basic read write function
211 */
212
213 static void __fsi_reg_write(u32 __iomem *reg, u32 data)
214 {
215 /* valid data area is 24bit */
216 data &= 0x00ffffff;
217
218 __raw_writel(data, reg);
219 }
220
221 static u32 __fsi_reg_read(u32 __iomem *reg)
222 {
223 return __raw_readl(reg);
224 }
225
226 static void __fsi_reg_mask_set(u32 __iomem *reg, u32 mask, u32 data)
227 {
228 u32 val = __fsi_reg_read(reg);
229
230 val &= ~mask;
231 val |= data & mask;
232
233 __fsi_reg_write(reg, val);
234 }
235
236 #define fsi_reg_write(p, r, d)\
237 __fsi_reg_write((u32)(p->base + REG_##r), d)
238
239 #define fsi_reg_read(p, r)\
240 __fsi_reg_read((u32)(p->base + REG_##r))
241
242 #define fsi_reg_mask_set(p, r, m, d)\
243 __fsi_reg_mask_set((u32)(p->base + REG_##r), m, d)
244
245 #define fsi_master_read(p, r) _fsi_master_read(p, MST_##r)
246 #define fsi_core_read(p, r) _fsi_master_read(p, p->core->r)
247 static u32 _fsi_master_read(struct fsi_master *master, u32 reg)
248 {
249 u32 ret;
250 unsigned long flags;
251
252 spin_lock_irqsave(&master->lock, flags);
253 ret = __fsi_reg_read(master->base + reg);
254 spin_unlock_irqrestore(&master->lock, flags);
255
256 return ret;
257 }
258
259 #define fsi_master_mask_set(p, r, m, d) _fsi_master_mask_set(p, MST_##r, m, d)
260 #define fsi_core_mask_set(p, r, m, d) _fsi_master_mask_set(p, p->core->r, m, d)
261 static void _fsi_master_mask_set(struct fsi_master *master,
262 u32 reg, u32 mask, u32 data)
263 {
264 unsigned long flags;
265
266 spin_lock_irqsave(&master->lock, flags);
267 __fsi_reg_mask_set(master->base + reg, mask, data);
268 spin_unlock_irqrestore(&master->lock, flags);
269 }
270
271 /*
272 * basic function
273 */
274
275 static struct fsi_master *fsi_get_master(struct fsi_priv *fsi)
276 {
277 return fsi->master;
278 }
279
280 static int fsi_is_clk_master(struct fsi_priv *fsi)
281 {
282 return fsi->clk_master;
283 }
284
285 static int fsi_is_port_a(struct fsi_priv *fsi)
286 {
287 return fsi->master->base == fsi->base;
288 }
289
290 static int fsi_is_spdif(struct fsi_priv *fsi)
291 {
292 return fsi->spdif;
293 }
294
295 static struct snd_soc_dai *fsi_get_dai(struct snd_pcm_substream *substream)
296 {
297 struct snd_soc_pcm_runtime *rtd = substream->private_data;
298
299 return rtd->cpu_dai;
300 }
301
302 static struct fsi_priv *fsi_get_priv_frm_dai(struct snd_soc_dai *dai)
303 {
304 struct fsi_master *master = snd_soc_dai_get_drvdata(dai);
305
306 if (dai->id == 0)
307 return &master->fsia;
308 else
309 return &master->fsib;
310 }
311
312 static struct fsi_priv *fsi_get_priv(struct snd_pcm_substream *substream)
313 {
314 return fsi_get_priv_frm_dai(fsi_get_dai(substream));
315 }
316
317 static set_rate_func fsi_get_info_set_rate(struct fsi_master *master)
318 {
319 if (!master->info)
320 return NULL;
321
322 return master->info->set_rate;
323 }
324
325 static u32 fsi_get_info_flags(struct fsi_priv *fsi)
326 {
327 int is_porta = fsi_is_port_a(fsi);
328 struct fsi_master *master = fsi_get_master(fsi);
329
330 if (!master->info)
331 return 0;
332
333 return is_porta ? master->info->porta_flags :
334 master->info->portb_flags;
335 }
336
337 static inline int fsi_stream_is_play(int stream)
338 {
339 return stream == SNDRV_PCM_STREAM_PLAYBACK;
340 }
341
342 static inline int fsi_is_play(struct snd_pcm_substream *substream)
343 {
344 return fsi_stream_is_play(substream->stream);
345 }
346
347 static inline struct fsi_stream *fsi_get_stream(struct fsi_priv *fsi,
348 int is_play)
349 {
350 return is_play ? &fsi->playback : &fsi->capture;
351 }
352
353 static u32 fsi_get_port_shift(struct fsi_priv *fsi, int is_play)
354 {
355 int is_porta = fsi_is_port_a(fsi);
356 u32 shift;
357
358 if (is_porta)
359 shift = is_play ? AO_SHIFT : AI_SHIFT;
360 else
361 shift = is_play ? BO_SHIFT : BI_SHIFT;
362
363 return shift;
364 }
365
366 static int fsi_frame2sample(struct fsi_priv *fsi, int frames)
367 {
368 return frames * fsi->chan_num;
369 }
370
371 static int fsi_sample2frame(struct fsi_priv *fsi, int samples)
372 {
373 return samples / fsi->chan_num;
374 }
375
376 static int fsi_stream_is_working(struct fsi_priv *fsi,
377 int is_play)
378 {
379 struct fsi_stream *io = fsi_get_stream(fsi, is_play);
380 struct fsi_master *master = fsi_get_master(fsi);
381 unsigned long flags;
382 int ret;
383
384 spin_lock_irqsave(&master->lock, flags);
385 ret = !!io->substream;
386 spin_unlock_irqrestore(&master->lock, flags);
387
388 return ret;
389 }
390
391 static void fsi_stream_push(struct fsi_priv *fsi,
392 int is_play,
393 struct snd_pcm_substream *substream)
394 {
395 struct fsi_stream *io = fsi_get_stream(fsi, is_play);
396 struct snd_pcm_runtime *runtime = substream->runtime;
397 struct fsi_master *master = fsi_get_master(fsi);
398 unsigned long flags;
399
400 spin_lock_irqsave(&master->lock, flags);
401 io->substream = substream;
402 io->buff_sample_capa = fsi_frame2sample(fsi, runtime->buffer_size);
403 io->buff_sample_pos = 0;
404 io->period_samples = fsi_frame2sample(fsi, runtime->period_size);
405 io->period_pos = 0;
406 io->oerr_num = -1; /* ignore 1st err */
407 io->uerr_num = -1; /* ignore 1st err */
408 spin_unlock_irqrestore(&master->lock, flags);
409 }
410
411 static void fsi_stream_pop(struct fsi_priv *fsi, int is_play)
412 {
413 struct fsi_stream *io = fsi_get_stream(fsi, is_play);
414 struct snd_soc_dai *dai = fsi_get_dai(io->substream);
415 struct fsi_master *master = fsi_get_master(fsi);
416 unsigned long flags;
417
418 spin_lock_irqsave(&master->lock, flags);
419
420 if (io->oerr_num > 0)
421 dev_err(dai->dev, "over_run = %d\n", io->oerr_num);
422
423 if (io->uerr_num > 0)
424 dev_err(dai->dev, "under_run = %d\n", io->uerr_num);
425
426 io->substream = NULL;
427 io->buff_sample_capa = 0;
428 io->buff_sample_pos = 0;
429 io->period_samples = 0;
430 io->period_pos = 0;
431 io->oerr_num = 0;
432 io->uerr_num = 0;
433 spin_unlock_irqrestore(&master->lock, flags);
434 }
435
436 static int fsi_get_current_fifo_samples(struct fsi_priv *fsi, int is_play)
437 {
438 u32 status;
439 int frames;
440
441 status = is_play ?
442 fsi_reg_read(fsi, DOFF_ST) :
443 fsi_reg_read(fsi, DIFF_ST);
444
445 frames = 0x1ff & (status >> 8);
446
447 return fsi_frame2sample(fsi, frames);
448 }
449
450 static void fsi_count_fifo_err(struct fsi_priv *fsi)
451 {
452 u32 ostatus = fsi_reg_read(fsi, DOFF_ST);
453 u32 istatus = fsi_reg_read(fsi, DIFF_ST);
454
455 if (ostatus & ERR_OVER)
456 fsi->playback.oerr_num++;
457
458 if (ostatus & ERR_UNDER)
459 fsi->playback.uerr_num++;
460
461 if (istatus & ERR_OVER)
462 fsi->capture.oerr_num++;
463
464 if (istatus & ERR_UNDER)
465 fsi->capture.uerr_num++;
466
467 fsi_reg_write(fsi, DOFF_ST, 0);
468 fsi_reg_write(fsi, DIFF_ST, 0);
469 }
470
471 /*
472 * dma function
473 */
474
475 static u8 *fsi_dma_get_area(struct fsi_priv *fsi, int stream)
476 {
477 int is_play = fsi_stream_is_play(stream);
478 struct fsi_stream *io = fsi_get_stream(fsi, is_play);
479 struct snd_pcm_runtime *runtime = io->substream->runtime;
480
481 return runtime->dma_area +
482 samples_to_bytes(runtime, io->buff_sample_pos);
483 }
484
485 static void fsi_dma_soft_push16(struct fsi_priv *fsi, int num)
486 {
487 u16 *start;
488 int i;
489
490 start = (u16 *)fsi_dma_get_area(fsi, SNDRV_PCM_STREAM_PLAYBACK);
491
492 for (i = 0; i < num; i++)
493 fsi_reg_write(fsi, DODT, ((u32)*(start + i) << 8));
494 }
495
496 static void fsi_dma_soft_pop16(struct fsi_priv *fsi, int num)
497 {
498 u16 *start;
499 int i;
500
501 start = (u16 *)fsi_dma_get_area(fsi, SNDRV_PCM_STREAM_CAPTURE);
502
503
504 for (i = 0; i < num; i++)
505 *(start + i) = (u16)(fsi_reg_read(fsi, DIDT) >> 8);
506 }
507
508 static void fsi_dma_soft_push32(struct fsi_priv *fsi, int num)
509 {
510 u32 *start;
511 int i;
512
513 start = (u32 *)fsi_dma_get_area(fsi, SNDRV_PCM_STREAM_PLAYBACK);
514
515
516 for (i = 0; i < num; i++)
517 fsi_reg_write(fsi, DODT, *(start + i));
518 }
519
520 static void fsi_dma_soft_pop32(struct fsi_priv *fsi, int num)
521 {
522 u32 *start;
523 int i;
524
525 start = (u32 *)fsi_dma_get_area(fsi, SNDRV_PCM_STREAM_CAPTURE);
526
527 for (i = 0; i < num; i++)
528 *(start + i) = fsi_reg_read(fsi, DIDT);
529 }
530
531 /*
532 * irq function
533 */
534
535 static void fsi_irq_enable(struct fsi_priv *fsi, int is_play)
536 {
537 u32 data = AB_IO(1, fsi_get_port_shift(fsi, is_play));
538 struct fsi_master *master = fsi_get_master(fsi);
539
540 fsi_core_mask_set(master, imsk, data, data);
541 fsi_core_mask_set(master, iemsk, data, data);
542 }
543
544 static void fsi_irq_disable(struct fsi_priv *fsi, int is_play)
545 {
546 u32 data = AB_IO(1, fsi_get_port_shift(fsi, is_play));
547 struct fsi_master *master = fsi_get_master(fsi);
548
549 fsi_core_mask_set(master, imsk, data, 0);
550 fsi_core_mask_set(master, iemsk, data, 0);
551 }
552
553 static u32 fsi_irq_get_status(struct fsi_master *master)
554 {
555 return fsi_core_read(master, int_st);
556 }
557
558 static void fsi_irq_clear_status(struct fsi_priv *fsi)
559 {
560 u32 data = 0;
561 struct fsi_master *master = fsi_get_master(fsi);
562
563 data |= AB_IO(1, fsi_get_port_shift(fsi, 0));
564 data |= AB_IO(1, fsi_get_port_shift(fsi, 1));
565
566 /* clear interrupt factor */
567 fsi_core_mask_set(master, int_st, data, 0);
568 }
569
570 /*
571 * SPDIF master clock function
572 *
573 * These functions are used later FSI2
574 */
575 static void fsi_spdif_clk_ctrl(struct fsi_priv *fsi, int enable)
576 {
577 struct fsi_master *master = fsi_get_master(fsi);
578 u32 mask, val;
579
580 if (master->core->ver < 2) {
581 pr_err("fsi: register access err (%s)\n", __func__);
582 return;
583 }
584
585 mask = BP | SE;
586 val = enable ? mask : 0;
587
588 fsi_is_port_a(fsi) ?
589 fsi_core_mask_set(master, a_mclk, mask, val) :
590 fsi_core_mask_set(master, b_mclk, mask, val);
591 }
592
593 /*
594 * clock function
595 */
596 static int fsi_set_master_clk(struct device *dev, struct fsi_priv *fsi,
597 long rate, int enable)
598 {
599 struct fsi_master *master = fsi_get_master(fsi);
600 set_rate_func set_rate = fsi_get_info_set_rate(master);
601 int fsi_ver = master->core->ver;
602 int ret;
603
604 ret = set_rate(dev, fsi_is_port_a(fsi), rate, enable);
605 if (ret < 0) /* error */
606 return ret;
607
608 if (!enable)
609 return 0;
610
611 if (ret > 0) {
612 u32 data = 0;
613
614 switch (ret & SH_FSI_ACKMD_MASK) {
615 default:
616 /* FALL THROUGH */
617 case SH_FSI_ACKMD_512:
618 data |= (0x0 << 12);
619 break;
620 case SH_FSI_ACKMD_256:
621 data |= (0x1 << 12);
622 break;
623 case SH_FSI_ACKMD_128:
624 data |= (0x2 << 12);
625 break;
626 case SH_FSI_ACKMD_64:
627 data |= (0x3 << 12);
628 break;
629 case SH_FSI_ACKMD_32:
630 if (fsi_ver < 2)
631 dev_err(dev, "unsupported ACKMD\n");
632 else
633 data |= (0x4 << 12);
634 break;
635 }
636
637 switch (ret & SH_FSI_BPFMD_MASK) {
638 default:
639 /* FALL THROUGH */
640 case SH_FSI_BPFMD_32:
641 data |= (0x0 << 8);
642 break;
643 case SH_FSI_BPFMD_64:
644 data |= (0x1 << 8);
645 break;
646 case SH_FSI_BPFMD_128:
647 data |= (0x2 << 8);
648 break;
649 case SH_FSI_BPFMD_256:
650 data |= (0x3 << 8);
651 break;
652 case SH_FSI_BPFMD_512:
653 data |= (0x4 << 8);
654 break;
655 case SH_FSI_BPFMD_16:
656 if (fsi_ver < 2)
657 dev_err(dev, "unsupported ACKMD\n");
658 else
659 data |= (0x7 << 8);
660 break;
661 }
662
663 fsi_reg_mask_set(fsi, CKG1, (ACKMD_MASK | BPFMD_MASK) , data);
664 udelay(10);
665 ret = 0;
666 }
667
668 return ret;
669 }
670
671 #define fsi_port_start(f, i) __fsi_port_clk_ctrl(f, i, 1)
672 #define fsi_port_stop(f, i) __fsi_port_clk_ctrl(f, i, 0)
673 static void __fsi_port_clk_ctrl(struct fsi_priv *fsi, int is_play, int enable)
674 {
675 struct fsi_master *master = fsi_get_master(fsi);
676 u32 clk = fsi_is_port_a(fsi) ? CRA : CRB;
677
678 if (enable)
679 fsi_irq_enable(fsi, is_play);
680 else
681 fsi_irq_disable(fsi, is_play);
682
683 if (fsi_is_clk_master(fsi))
684 fsi_master_mask_set(master, CLK_RST, clk, (enable) ? clk : 0);
685 }
686
687 /*
688 * ctrl function
689 */
690 static void fsi_fifo_init(struct fsi_priv *fsi,
691 int is_play,
692 struct device *dev)
693 {
694 struct fsi_master *master = fsi_get_master(fsi);
695 struct fsi_stream *io = fsi_get_stream(fsi, is_play);
696 u32 shift, i;
697 int frame_capa;
698
699 /* get on-chip RAM capacity */
700 shift = fsi_master_read(master, FIFO_SZ);
701 shift >>= fsi_get_port_shift(fsi, is_play);
702 shift &= FIFO_SZ_MASK;
703 frame_capa = 256 << shift;
704 dev_dbg(dev, "fifo = %d words\n", frame_capa);
705
706 /*
707 * The maximum number of sample data varies depending
708 * on the number of channels selected for the format.
709 *
710 * FIFOs are used in 4-channel units in 3-channel mode
711 * and in 8-channel units in 5- to 7-channel mode
712 * meaning that more FIFOs than the required size of DPRAM
713 * are used.
714 *
715 * ex) if 256 words of DP-RAM is connected
716 * 1 channel: 256 (256 x 1 = 256)
717 * 2 channels: 128 (128 x 2 = 256)
718 * 3 channels: 64 ( 64 x 3 = 192)
719 * 4 channels: 64 ( 64 x 4 = 256)
720 * 5 channels: 32 ( 32 x 5 = 160)
721 * 6 channels: 32 ( 32 x 6 = 192)
722 * 7 channels: 32 ( 32 x 7 = 224)
723 * 8 channels: 32 ( 32 x 8 = 256)
724 */
725 for (i = 1; i < fsi->chan_num; i <<= 1)
726 frame_capa >>= 1;
727 dev_dbg(dev, "%d channel %d store\n",
728 fsi->chan_num, frame_capa);
729
730 io->fifo_sample_capa = fsi_frame2sample(fsi, frame_capa);
731
732 /*
733 * set interrupt generation factor
734 * clear FIFO
735 */
736 if (is_play) {
737 fsi_reg_write(fsi, DOFF_CTL, IRQ_HALF);
738 fsi_reg_mask_set(fsi, DOFF_CTL, FIFO_CLR, FIFO_CLR);
739 } else {
740 fsi_reg_write(fsi, DIFF_CTL, IRQ_HALF);
741 fsi_reg_mask_set(fsi, DIFF_CTL, FIFO_CLR, FIFO_CLR);
742 }
743 }
744
745 static int fsi_fifo_data_ctrl(struct fsi_priv *fsi, int stream)
746 {
747 struct snd_pcm_runtime *runtime;
748 struct snd_pcm_substream *substream = NULL;
749 int is_play = fsi_stream_is_play(stream);
750 struct fsi_stream *io = fsi_get_stream(fsi, is_play);
751 int sample_residues;
752 int sample_width;
753 int samples;
754 int samples_max;
755 int over_period;
756 void (*fn)(struct fsi_priv *fsi, int size);
757
758 if (!fsi ||
759 !io->substream ||
760 !io->substream->runtime)
761 return -EINVAL;
762
763 over_period = 0;
764 substream = io->substream;
765 runtime = substream->runtime;
766
767 /* FSI FIFO has limit.
768 * So, this driver can not send periods data at a time
769 */
770 if (io->buff_sample_pos >=
771 io->period_samples * (io->period_pos + 1)) {
772
773 over_period = 1;
774 io->period_pos = (io->period_pos + 1) % runtime->periods;
775
776 if (0 == io->period_pos)
777 io->buff_sample_pos = 0;
778 }
779
780 /* get 1 sample data width */
781 sample_width = samples_to_bytes(runtime, 1);
782
783 /* get number of residue samples */
784 sample_residues = io->buff_sample_capa - io->buff_sample_pos;
785
786 if (is_play) {
787 /*
788 * for play-back
789 *
790 * samples_max : number of FSI fifo free samples space
791 * samples : number of ALSA residue samples
792 */
793 samples_max = io->fifo_sample_capa;
794 samples_max -= fsi_get_current_fifo_samples(fsi, is_play);
795
796 samples = sample_residues;
797
798 switch (sample_width) {
799 case 2:
800 fn = fsi_dma_soft_push16;
801 break;
802 case 4:
803 fn = fsi_dma_soft_push32;
804 break;
805 default:
806 return -EINVAL;
807 }
808 } else {
809 /*
810 * for capture
811 *
812 * samples_max : number of ALSA free samples space
813 * samples : number of samples in FSI fifo
814 */
815 samples_max = sample_residues;
816 samples = fsi_get_current_fifo_samples(fsi, is_play);
817
818 switch (sample_width) {
819 case 2:
820 fn = fsi_dma_soft_pop16;
821 break;
822 case 4:
823 fn = fsi_dma_soft_pop32;
824 break;
825 default:
826 return -EINVAL;
827 }
828 }
829
830 samples = min(samples, samples_max);
831
832 fn(fsi, samples);
833
834 /* update buff_sample_pos */
835 io->buff_sample_pos += samples;
836
837 if (over_period)
838 snd_pcm_period_elapsed(substream);
839
840 return 0;
841 }
842
843 static int fsi_data_pop(struct fsi_priv *fsi)
844 {
845 return fsi_fifo_data_ctrl(fsi, SNDRV_PCM_STREAM_CAPTURE);
846 }
847
848 static int fsi_data_push(struct fsi_priv *fsi)
849 {
850 return fsi_fifo_data_ctrl(fsi, SNDRV_PCM_STREAM_PLAYBACK);
851 }
852
853 static irqreturn_t fsi_interrupt(int irq, void *data)
854 {
855 struct fsi_master *master = data;
856 u32 int_st = fsi_irq_get_status(master);
857
858 /* clear irq status */
859 fsi_master_mask_set(master, SOFT_RST, IR, 0);
860 fsi_master_mask_set(master, SOFT_RST, IR, IR);
861
862 if (int_st & AB_IO(1, AO_SHIFT))
863 fsi_data_push(&master->fsia);
864 if (int_st & AB_IO(1, BO_SHIFT))
865 fsi_data_push(&master->fsib);
866 if (int_st & AB_IO(1, AI_SHIFT))
867 fsi_data_pop(&master->fsia);
868 if (int_st & AB_IO(1, BI_SHIFT))
869 fsi_data_pop(&master->fsib);
870
871 fsi_count_fifo_err(&master->fsia);
872 fsi_count_fifo_err(&master->fsib);
873
874 fsi_irq_clear_status(&master->fsia);
875 fsi_irq_clear_status(&master->fsib);
876
877 return IRQ_HANDLED;
878 }
879
880 /*
881 * dai ops
882 */
883
884 static int fsi_hw_startup(struct fsi_priv *fsi,
885 int is_play,
886 struct device *dev)
887 {
888 u32 flags = fsi_get_info_flags(fsi);
889 u32 data = 0;
890
891 pm_runtime_get_sync(dev);
892
893 /* clock setting */
894 if (fsi_is_clk_master(fsi))
895 data = DIMD | DOMD;
896
897 fsi_reg_mask_set(fsi, CKG1, (DIMD | DOMD), data);
898
899 /* clock inversion (CKG2) */
900 data = 0;
901 if (SH_FSI_LRM_INV & flags)
902 data |= 1 << 12;
903 if (SH_FSI_BRM_INV & flags)
904 data |= 1 << 8;
905 if (SH_FSI_LRS_INV & flags)
906 data |= 1 << 4;
907 if (SH_FSI_BRS_INV & flags)
908 data |= 1 << 0;
909
910 fsi_reg_write(fsi, CKG2, data);
911
912 /* set format */
913 fsi_reg_write(fsi, DO_FMT, fsi->do_fmt);
914 fsi_reg_write(fsi, DI_FMT, fsi->di_fmt);
915
916 /* spdif ? */
917 if (fsi_is_spdif(fsi)) {
918 fsi_spdif_clk_ctrl(fsi, 1);
919 fsi_reg_mask_set(fsi, OUT_SEL, DMMD, DMMD);
920 }
921
922 /* irq clear */
923 fsi_irq_disable(fsi, is_play);
924 fsi_irq_clear_status(fsi);
925
926 /* fifo init */
927 fsi_fifo_init(fsi, is_play, dev);
928
929 return 0;
930 }
931
932 static void fsi_hw_shutdown(struct fsi_priv *fsi,
933 int is_play,
934 struct device *dev)
935 {
936 if (fsi_is_clk_master(fsi))
937 fsi_set_master_clk(dev, fsi, fsi->rate, 0);
938
939 pm_runtime_put_sync(dev);
940 }
941
942 static int fsi_dai_startup(struct snd_pcm_substream *substream,
943 struct snd_soc_dai *dai)
944 {
945 struct fsi_priv *fsi = fsi_get_priv(substream);
946 int is_play = fsi_is_play(substream);
947
948 return fsi_hw_startup(fsi, is_play, dai->dev);
949 }
950
951 static void fsi_dai_shutdown(struct snd_pcm_substream *substream,
952 struct snd_soc_dai *dai)
953 {
954 struct fsi_priv *fsi = fsi_get_priv(substream);
955 int is_play = fsi_is_play(substream);
956
957 fsi_hw_shutdown(fsi, is_play, dai->dev);
958 fsi->rate = 0;
959 }
960
961 static int fsi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
962 struct snd_soc_dai *dai)
963 {
964 struct fsi_priv *fsi = fsi_get_priv(substream);
965 int is_play = fsi_is_play(substream);
966 int ret = 0;
967
968 switch (cmd) {
969 case SNDRV_PCM_TRIGGER_START:
970 fsi_stream_push(fsi, is_play, substream);
971 ret = is_play ? fsi_data_push(fsi) : fsi_data_pop(fsi);
972 fsi_port_start(fsi, is_play);
973 break;
974 case SNDRV_PCM_TRIGGER_STOP:
975 fsi_port_stop(fsi, is_play);
976 fsi_stream_pop(fsi, is_play);
977 break;
978 }
979
980 return ret;
981 }
982
983 static int fsi_set_fmt_dai(struct fsi_priv *fsi, unsigned int fmt)
984 {
985 u32 data = 0;
986
987 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
988 case SND_SOC_DAIFMT_I2S:
989 data = CR_I2S;
990 fsi->chan_num = 2;
991 break;
992 case SND_SOC_DAIFMT_LEFT_J:
993 data = CR_PCM;
994 fsi->chan_num = 2;
995 break;
996 default:
997 return -EINVAL;
998 }
999
1000 fsi->do_fmt = data;
1001 fsi->di_fmt = data;
1002
1003 return 0;
1004 }
1005
1006 static int fsi_set_fmt_spdif(struct fsi_priv *fsi)
1007 {
1008 struct fsi_master *master = fsi_get_master(fsi);
1009 u32 data = 0;
1010
1011 if (master->core->ver < 2)
1012 return -EINVAL;
1013
1014 data = CR_BWS_16 | CR_DTMD_SPDIF_PCM | CR_PCM;
1015 fsi->chan_num = 2;
1016 fsi->spdif = 1;
1017
1018 fsi->do_fmt = data;
1019 fsi->di_fmt = data;
1020
1021 return 0;
1022 }
1023
1024 static int fsi_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
1025 {
1026 struct fsi_priv *fsi = fsi_get_priv_frm_dai(dai);
1027 struct fsi_master *master = fsi_get_master(fsi);
1028 set_rate_func set_rate = fsi_get_info_set_rate(master);
1029 u32 flags = fsi_get_info_flags(fsi);
1030 int ret;
1031
1032 /* set master/slave audio interface */
1033 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
1034 case SND_SOC_DAIFMT_CBM_CFM:
1035 fsi->clk_master = 1;
1036 break;
1037 case SND_SOC_DAIFMT_CBS_CFS:
1038 break;
1039 default:
1040 return -EINVAL;
1041 }
1042
1043 if (fsi_is_clk_master(fsi) && !set_rate) {
1044 dev_err(dai->dev, "platform doesn't have set_rate\n");
1045 return -EINVAL;
1046 }
1047
1048 /* set format */
1049 switch (flags & SH_FSI_FMT_MASK) {
1050 case SH_FSI_FMT_DAI:
1051 ret = fsi_set_fmt_dai(fsi, fmt & SND_SOC_DAIFMT_FORMAT_MASK);
1052 break;
1053 case SH_FSI_FMT_SPDIF:
1054 ret = fsi_set_fmt_spdif(fsi);
1055 break;
1056 default:
1057 ret = -EINVAL;
1058 }
1059
1060 return ret;
1061 }
1062
1063 static int fsi_dai_hw_params(struct snd_pcm_substream *substream,
1064 struct snd_pcm_hw_params *params,
1065 struct snd_soc_dai *dai)
1066 {
1067 struct fsi_priv *fsi = fsi_get_priv(substream);
1068 long rate = params_rate(params);
1069 int ret;
1070
1071 if (!fsi_is_clk_master(fsi))
1072 return 0;
1073
1074 ret = fsi_set_master_clk(dai->dev, fsi, rate, 1);
1075 if (ret < 0)
1076 return ret;
1077
1078 fsi->rate = rate;
1079
1080 return ret;
1081 }
1082
1083 static struct snd_soc_dai_ops fsi_dai_ops = {
1084 .startup = fsi_dai_startup,
1085 .shutdown = fsi_dai_shutdown,
1086 .trigger = fsi_dai_trigger,
1087 .set_fmt = fsi_dai_set_fmt,
1088 .hw_params = fsi_dai_hw_params,
1089 };
1090
1091 /*
1092 * pcm ops
1093 */
1094
1095 static struct snd_pcm_hardware fsi_pcm_hardware = {
1096 .info = SNDRV_PCM_INFO_INTERLEAVED |
1097 SNDRV_PCM_INFO_MMAP |
1098 SNDRV_PCM_INFO_MMAP_VALID |
1099 SNDRV_PCM_INFO_PAUSE,
1100 .formats = FSI_FMTS,
1101 .rates = FSI_RATES,
1102 .rate_min = 8000,
1103 .rate_max = 192000,
1104 .channels_min = 1,
1105 .channels_max = 2,
1106 .buffer_bytes_max = 64 * 1024,
1107 .period_bytes_min = 32,
1108 .period_bytes_max = 8192,
1109 .periods_min = 1,
1110 .periods_max = 32,
1111 .fifo_size = 256,
1112 };
1113
1114 static int fsi_pcm_open(struct snd_pcm_substream *substream)
1115 {
1116 struct snd_pcm_runtime *runtime = substream->runtime;
1117 int ret = 0;
1118
1119 snd_soc_set_runtime_hwparams(substream, &fsi_pcm_hardware);
1120
1121 ret = snd_pcm_hw_constraint_integer(runtime,
1122 SNDRV_PCM_HW_PARAM_PERIODS);
1123
1124 return ret;
1125 }
1126
1127 static int fsi_hw_params(struct snd_pcm_substream *substream,
1128 struct snd_pcm_hw_params *hw_params)
1129 {
1130 return snd_pcm_lib_malloc_pages(substream,
1131 params_buffer_bytes(hw_params));
1132 }
1133
1134 static int fsi_hw_free(struct snd_pcm_substream *substream)
1135 {
1136 return snd_pcm_lib_free_pages(substream);
1137 }
1138
1139 static snd_pcm_uframes_t fsi_pointer(struct snd_pcm_substream *substream)
1140 {
1141 struct fsi_priv *fsi = fsi_get_priv(substream);
1142 struct fsi_stream *io = fsi_get_stream(fsi, fsi_is_play(substream));
1143 int samples_pos = io->buff_sample_pos - 1;
1144
1145 if (samples_pos < 0)
1146 samples_pos = 0;
1147
1148 return fsi_sample2frame(fsi, samples_pos);
1149 }
1150
1151 static struct snd_pcm_ops fsi_pcm_ops = {
1152 .open = fsi_pcm_open,
1153 .ioctl = snd_pcm_lib_ioctl,
1154 .hw_params = fsi_hw_params,
1155 .hw_free = fsi_hw_free,
1156 .pointer = fsi_pointer,
1157 };
1158
1159 /*
1160 * snd_soc_platform
1161 */
1162
1163 #define PREALLOC_BUFFER (32 * 1024)
1164 #define PREALLOC_BUFFER_MAX (32 * 1024)
1165
1166 static void fsi_pcm_free(struct snd_pcm *pcm)
1167 {
1168 snd_pcm_lib_preallocate_free_for_all(pcm);
1169 }
1170
1171 static int fsi_pcm_new(struct snd_soc_pcm_runtime *rtd)
1172 {
1173 struct snd_pcm *pcm = rtd->pcm;
1174
1175 /*
1176 * dont use SNDRV_DMA_TYPE_DEV, since it will oops the SH kernel
1177 * in MMAP mode (i.e. aplay -M)
1178 */
1179 return snd_pcm_lib_preallocate_pages_for_all(
1180 pcm,
1181 SNDRV_DMA_TYPE_CONTINUOUS,
1182 snd_dma_continuous_data(GFP_KERNEL),
1183 PREALLOC_BUFFER, PREALLOC_BUFFER_MAX);
1184 }
1185
1186 /*
1187 * alsa struct
1188 */
1189
1190 static struct snd_soc_dai_driver fsi_soc_dai[] = {
1191 {
1192 .name = "fsia-dai",
1193 .playback = {
1194 .rates = FSI_RATES,
1195 .formats = FSI_FMTS,
1196 .channels_min = 1,
1197 .channels_max = 8,
1198 },
1199 .capture = {
1200 .rates = FSI_RATES,
1201 .formats = FSI_FMTS,
1202 .channels_min = 1,
1203 .channels_max = 8,
1204 },
1205 .ops = &fsi_dai_ops,
1206 },
1207 {
1208 .name = "fsib-dai",
1209 .playback = {
1210 .rates = FSI_RATES,
1211 .formats = FSI_FMTS,
1212 .channels_min = 1,
1213 .channels_max = 8,
1214 },
1215 .capture = {
1216 .rates = FSI_RATES,
1217 .formats = FSI_FMTS,
1218 .channels_min = 1,
1219 .channels_max = 8,
1220 },
1221 .ops = &fsi_dai_ops,
1222 },
1223 };
1224
1225 static struct snd_soc_platform_driver fsi_soc_platform = {
1226 .ops = &fsi_pcm_ops,
1227 .pcm_new = fsi_pcm_new,
1228 .pcm_free = fsi_pcm_free,
1229 };
1230
1231 /*
1232 * platform function
1233 */
1234
1235 static int fsi_probe(struct platform_device *pdev)
1236 {
1237 struct fsi_master *master;
1238 const struct platform_device_id *id_entry;
1239 struct resource *res;
1240 unsigned int irq;
1241 int ret;
1242
1243 id_entry = pdev->id_entry;
1244 if (!id_entry) {
1245 dev_err(&pdev->dev, "unknown fsi device\n");
1246 return -ENODEV;
1247 }
1248
1249 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1250 irq = platform_get_irq(pdev, 0);
1251 if (!res || (int)irq <= 0) {
1252 dev_err(&pdev->dev, "Not enough FSI platform resources.\n");
1253 ret = -ENODEV;
1254 goto exit;
1255 }
1256
1257 master = kzalloc(sizeof(*master), GFP_KERNEL);
1258 if (!master) {
1259 dev_err(&pdev->dev, "Could not allocate master\n");
1260 ret = -ENOMEM;
1261 goto exit;
1262 }
1263
1264 master->base = ioremap_nocache(res->start, resource_size(res));
1265 if (!master->base) {
1266 ret = -ENXIO;
1267 dev_err(&pdev->dev, "Unable to ioremap FSI registers.\n");
1268 goto exit_kfree;
1269 }
1270
1271 /* master setting */
1272 master->irq = irq;
1273 master->info = pdev->dev.platform_data;
1274 master->core = (struct fsi_core *)id_entry->driver_data;
1275 spin_lock_init(&master->lock);
1276
1277 /* FSI A setting */
1278 master->fsia.base = master->base;
1279 master->fsia.master = master;
1280
1281 /* FSI B setting */
1282 master->fsib.base = master->base + 0x40;
1283 master->fsib.master = master;
1284
1285 pm_runtime_enable(&pdev->dev);
1286 dev_set_drvdata(&pdev->dev, master);
1287
1288 ret = request_irq(irq, &fsi_interrupt, 0,
1289 id_entry->name, master);
1290 if (ret) {
1291 dev_err(&pdev->dev, "irq request err\n");
1292 goto exit_iounmap;
1293 }
1294
1295 ret = snd_soc_register_platform(&pdev->dev, &fsi_soc_platform);
1296 if (ret < 0) {
1297 dev_err(&pdev->dev, "cannot snd soc register\n");
1298 goto exit_free_irq;
1299 }
1300
1301 ret = snd_soc_register_dais(&pdev->dev, fsi_soc_dai,
1302 ARRAY_SIZE(fsi_soc_dai));
1303 if (ret < 0) {
1304 dev_err(&pdev->dev, "cannot snd dai register\n");
1305 goto exit_snd_soc;
1306 }
1307
1308 return ret;
1309
1310 exit_snd_soc:
1311 snd_soc_unregister_platform(&pdev->dev);
1312 exit_free_irq:
1313 free_irq(irq, master);
1314 exit_iounmap:
1315 iounmap(master->base);
1316 pm_runtime_disable(&pdev->dev);
1317 exit_kfree:
1318 kfree(master);
1319 master = NULL;
1320 exit:
1321 return ret;
1322 }
1323
1324 static int fsi_remove(struct platform_device *pdev)
1325 {
1326 struct fsi_master *master;
1327
1328 master = dev_get_drvdata(&pdev->dev);
1329
1330 free_irq(master->irq, master);
1331 pm_runtime_disable(&pdev->dev);
1332
1333 snd_soc_unregister_dais(&pdev->dev, ARRAY_SIZE(fsi_soc_dai));
1334 snd_soc_unregister_platform(&pdev->dev);
1335
1336 iounmap(master->base);
1337 kfree(master);
1338
1339 return 0;
1340 }
1341
1342 static void __fsi_suspend(struct fsi_priv *fsi,
1343 int is_play,
1344 struct device *dev)
1345 {
1346 if (!fsi_stream_is_working(fsi, is_play))
1347 return;
1348
1349 fsi_port_stop(fsi, is_play);
1350 fsi_hw_shutdown(fsi, is_play, dev);
1351 }
1352
1353 static void __fsi_resume(struct fsi_priv *fsi,
1354 int is_play,
1355 struct device *dev)
1356 {
1357 if (!fsi_stream_is_working(fsi, is_play))
1358 return;
1359
1360 fsi_hw_startup(fsi, is_play, dev);
1361
1362 if (fsi_is_clk_master(fsi) && fsi->rate)
1363 fsi_set_master_clk(dev, fsi, fsi->rate, 1);
1364
1365 fsi_port_start(fsi, is_play);
1366
1367 }
1368
1369 static int fsi_suspend(struct device *dev)
1370 {
1371 struct fsi_master *master = dev_get_drvdata(dev);
1372 struct fsi_priv *fsia = &master->fsia;
1373 struct fsi_priv *fsib = &master->fsib;
1374
1375 __fsi_suspend(fsia, 1, dev);
1376 __fsi_suspend(fsia, 0, dev);
1377
1378 __fsi_suspend(fsib, 1, dev);
1379 __fsi_suspend(fsib, 0, dev);
1380
1381 return 0;
1382 }
1383
1384 static int fsi_resume(struct device *dev)
1385 {
1386 struct fsi_master *master = dev_get_drvdata(dev);
1387 struct fsi_priv *fsia = &master->fsia;
1388 struct fsi_priv *fsib = &master->fsib;
1389
1390 __fsi_resume(fsia, 1, dev);
1391 __fsi_resume(fsia, 0, dev);
1392
1393 __fsi_resume(fsib, 1, dev);
1394 __fsi_resume(fsib, 0, dev);
1395
1396 return 0;
1397 }
1398
1399 static int fsi_runtime_nop(struct device *dev)
1400 {
1401 /* Runtime PM callback shared between ->runtime_suspend()
1402 * and ->runtime_resume(). Simply returns success.
1403 *
1404 * This driver re-initializes all registers after
1405 * pm_runtime_get_sync() anyway so there is no need
1406 * to save and restore registers here.
1407 */
1408 return 0;
1409 }
1410
1411 static struct dev_pm_ops fsi_pm_ops = {
1412 .suspend = fsi_suspend,
1413 .resume = fsi_resume,
1414 .runtime_suspend = fsi_runtime_nop,
1415 .runtime_resume = fsi_runtime_nop,
1416 };
1417
1418 static struct fsi_core fsi1_core = {
1419 .ver = 1,
1420
1421 /* Interrupt */
1422 .int_st = INT_ST,
1423 .iemsk = IEMSK,
1424 .imsk = IMSK,
1425 };
1426
1427 static struct fsi_core fsi2_core = {
1428 .ver = 2,
1429
1430 /* Interrupt */
1431 .int_st = CPU_INT_ST,
1432 .iemsk = CPU_IEMSK,
1433 .imsk = CPU_IMSK,
1434 .a_mclk = A_MST_CTLR,
1435 .b_mclk = B_MST_CTLR,
1436 };
1437
1438 static struct platform_device_id fsi_id_table[] = {
1439 { "sh_fsi", (kernel_ulong_t)&fsi1_core },
1440 { "sh_fsi2", (kernel_ulong_t)&fsi2_core },
1441 {},
1442 };
1443 MODULE_DEVICE_TABLE(platform, fsi_id_table);
1444
1445 static struct platform_driver fsi_driver = {
1446 .driver = {
1447 .name = "fsi-pcm-audio",
1448 .pm = &fsi_pm_ops,
1449 },
1450 .probe = fsi_probe,
1451 .remove = fsi_remove,
1452 .id_table = fsi_id_table,
1453 };
1454
1455 static int __init fsi_mobile_init(void)
1456 {
1457 return platform_driver_register(&fsi_driver);
1458 }
1459
1460 static void __exit fsi_mobile_exit(void)
1461 {
1462 platform_driver_unregister(&fsi_driver);
1463 }
1464
1465 module_init(fsi_mobile_init);
1466 module_exit(fsi_mobile_exit);
1467
1468 MODULE_LICENSE("GPL");
1469 MODULE_DESCRIPTION("SuperH onchip FSI audio driver");
1470 MODULE_AUTHOR("Kuninori Morimoto <morimoto.kuninori@renesas.com>");
1471 MODULE_ALIAS("platform:fsi-pcm-audio");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree