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[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / sound / soc / sh / fsi.c
blob3d7016e128f9374d2febb9564f404ed02db6b4db
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 <linux/module.h>
20 #include <sound/soc.h>
21 #include <sound/sh_fsi.h>
22
23 /* PortA/PortB register */
24 #define REG_DO_FMT 0x0000
25 #define REG_DOFF_CTL 0x0004
26 #define REG_DOFF_ST 0x0008
27 #define REG_DI_FMT 0x000C
28 #define REG_DIFF_CTL 0x0010
29 #define REG_DIFF_ST 0x0014
30 #define REG_CKG1 0x0018
31 #define REG_CKG2 0x001C
32 #define REG_DIDT 0x0020
33 #define REG_DODT 0x0024
34 #define REG_MUTE_ST 0x0028
35 #define REG_OUT_SEL 0x0030
36
37 /* master register */
38 #define MST_CLK_RST 0x0210
39 #define MST_SOFT_RST 0x0214
40 #define MST_FIFO_SZ 0x0218
41
42 /* core register (depend on FSI version) */
43 #define A_MST_CTLR 0x0180
44 #define B_MST_CTLR 0x01A0
45 #define CPU_INT_ST 0x01F4
46 #define CPU_IEMSK 0x01F8
47 #define CPU_IMSK 0x01FC
48 #define INT_ST 0x0200
49 #define IEMSK 0x0204
50 #define IMSK 0x0208
51
52 /* DO_FMT */
53 /* DI_FMT */
54 #define CR_BWS_24 (0x0 << 20) /* FSI2 */
55 #define CR_BWS_16 (0x1 << 20) /* FSI2 */
56 #define CR_BWS_20 (0x2 << 20) /* FSI2 */
57
58 #define CR_DTMD_PCM (0x0 << 8) /* FSI2 */
59 #define CR_DTMD_SPDIF_PCM (0x1 << 8) /* FSI2 */
60 #define CR_DTMD_SPDIF_STREAM (0x2 << 8) /* FSI2 */
61
62 #define CR_MONO (0x0 << 4)
63 #define CR_MONO_D (0x1 << 4)
64 #define CR_PCM (0x2 << 4)
65 #define CR_I2S (0x3 << 4)
66 #define CR_TDM (0x4 << 4)
67 #define CR_TDM_D (0x5 << 4)
68
69 /* DOFF_CTL */
70 /* DIFF_CTL */
71 #define IRQ_HALF 0x00100000
72 #define FIFO_CLR 0x00000001
73
74 /* DOFF_ST */
75 #define ERR_OVER 0x00000010
76 #define ERR_UNDER 0x00000001
77 #define ST_ERR (ERR_OVER | ERR_UNDER)
78
79 /* CKG1 */
80 #define ACKMD_MASK 0x00007000
81 #define BPFMD_MASK 0x00000700
82 #define DIMD (1 << 4)
83 #define DOMD (1 << 0)
84
85 /* A/B MST_CTLR */
86 #define BP (1 << 4) /* Fix the signal of Biphase output */
87 #define SE (1 << 0) /* Fix the master clock */
88
89 /* CLK_RST */
90 #define CRB (1 << 4)
91 #define CRA (1 << 0)
92
93 /* IO SHIFT / MACRO */
94 #define BI_SHIFT 12
95 #define BO_SHIFT 8
96 #define AI_SHIFT 4
97 #define AO_SHIFT 0
98 #define AB_IO(param, shift) (param << shift)
99
100 /* SOFT_RST */
101 #define PBSR (1 << 12) /* Port B Software Reset */
102 #define PASR (1 << 8) /* Port A Software Reset */
103 #define IR (1 << 4) /* Interrupt Reset */
104 #define FSISR (1 << 0) /* Software Reset */
105
106 /* OUT_SEL (FSI2) */
107 #define DMMD (1 << 4) /* SPDIF output timing 0: Biphase only */
108 /* 1: Biphase and serial */
109
110 /* FIFO_SZ */
111 #define FIFO_SZ_MASK 0x7
112
113 #define FSI_RATES SNDRV_PCM_RATE_8000_96000
114
115 #define FSI_FMTS (SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S16_LE)
116
117 typedef int (*set_rate_func)(struct device *dev, int is_porta, int rate, int enable);
118
119 /*
120 * FSI driver use below type name for variable
121 *
122 * xxx_num : number of data
123 * xxx_pos : position of data
124 * xxx_capa : capacity of data
125 */
126
127 /*
128 * period/frame/sample image
129 *
130 * ex) PCM (2ch)
131 *
132 * period pos period pos
133 * [n] [n + 1]
134 * |<-------------------- period--------------------->|
135 * ==|============================================ ... =|==
136 * | |
137 * ||<----- frame ----->|<------ frame ----->| ... |
138 * |+--------------------+--------------------+- ... |
139 * ||[ sample ][ sample ]|[ sample ][ sample ]| ... |
140 * |+--------------------+--------------------+- ... |
141 * ==|============================================ ... =|==
142 */
143
144 /*
145 * FSI FIFO image
146 *
147 * | |
148 * | |
149 * | [ sample ] |
150 * | [ sample ] |
151 * | [ sample ] |
152 * | [ sample ] |
153 * --> go to codecs
154 */
155
156 /*
157 * struct
158 */
159
160 struct fsi_stream {
161 struct snd_pcm_substream *substream;
162
163 int fifo_sample_capa; /* sample capacity of FSI FIFO */
164 int buff_sample_capa; /* sample capacity of ALSA buffer */
165 int buff_sample_pos; /* sample position of ALSA buffer */
166 int period_samples; /* sample number / 1 period */
167 int period_pos; /* current period position */
168
169 int uerr_num;
170 int oerr_num;
171 };
172
173 struct fsi_priv {
174 void __iomem *base;
175 struct fsi_master *master;
176
177 struct fsi_stream playback;
178 struct fsi_stream capture;
179
180 u32 do_fmt;
181 u32 di_fmt;
182
183 int chan_num:16;
184 int clk_master:1;
185 int spdif:1;
186
187 long rate;
188 };
189
190 struct fsi_core {
191 int ver;
192
193 u32 int_st;
194 u32 iemsk;
195 u32 imsk;
196 u32 a_mclk;
197 u32 b_mclk;
198 };
199
200 struct fsi_master {
201 void __iomem *base;
202 int irq;
203 struct fsi_priv fsia;
204 struct fsi_priv fsib;
205 struct fsi_core *core;
206 struct sh_fsi_platform_info *info;
207 spinlock_t lock;
208 };
209
210 /*
211 * basic read write function
212 */
213
214 static void __fsi_reg_write(u32 __iomem *reg, u32 data)
215 {
216 /* valid data area is 24bit */
217 data &= 0x00ffffff;
218
219 __raw_writel(data, reg);
220 }
221
222 static u32 __fsi_reg_read(u32 __iomem *reg)
223 {
224 return __raw_readl(reg);
225 }
226
227 static void __fsi_reg_mask_set(u32 __iomem *reg, u32 mask, u32 data)
228 {
229 u32 val = __fsi_reg_read(reg);
230
231 val &= ~mask;
232 val |= data & mask;
233
234 __fsi_reg_write(reg, val);
235 }
236
237 #define fsi_reg_write(p, r, d)\
238 __fsi_reg_write((u32)(p->base + REG_##r), d)
239
240 #define fsi_reg_read(p, r)\
241 __fsi_reg_read((u32)(p->base + REG_##r))
242
243 #define fsi_reg_mask_set(p, r, m, d)\
244 __fsi_reg_mask_set((u32)(p->base + REG_##r), m, d)
245
246 #define fsi_master_read(p, r) _fsi_master_read(p, MST_##r)
247 #define fsi_core_read(p, r) _fsi_master_read(p, p->core->r)
248 static u32 _fsi_master_read(struct fsi_master *master, u32 reg)
249 {
250 u32 ret;
251 unsigned long flags;
252
253 spin_lock_irqsave(&master->lock, flags);
254 ret = __fsi_reg_read(master->base + reg);
255 spin_unlock_irqrestore(&master->lock, flags);
256
257 return ret;
258 }
259
260 #define fsi_master_mask_set(p, r, m, d) _fsi_master_mask_set(p, MST_##r, m, d)
261 #define fsi_core_mask_set(p, r, m, d) _fsi_master_mask_set(p, p->core->r, m, d)
262 static void _fsi_master_mask_set(struct fsi_master *master,
263 u32 reg, u32 mask, u32 data)
264 {
265 unsigned long flags;
266
267 spin_lock_irqsave(&master->lock, flags);
268 __fsi_reg_mask_set(master->base + reg, mask, data);
269 spin_unlock_irqrestore(&master->lock, flags);
270 }
271
272 /*
273 * basic function
274 */
275
276 static struct fsi_master *fsi_get_master(struct fsi_priv *fsi)
277 {
278 return fsi->master;
279 }
280
281 static int fsi_is_clk_master(struct fsi_priv *fsi)
282 {
283 return fsi->clk_master;
284 }
285
286 static int fsi_is_port_a(struct fsi_priv *fsi)
287 {
288 return fsi->master->base == fsi->base;
289 }
290
291 static int fsi_is_spdif(struct fsi_priv *fsi)
292 {
293 return fsi->spdif;
294 }
295
296 static struct snd_soc_dai *fsi_get_dai(struct snd_pcm_substream *substream)
297 {
298 struct snd_soc_pcm_runtime *rtd = substream->private_data;
299
300 return rtd->cpu_dai;
301 }
302
303 static struct fsi_priv *fsi_get_priv_frm_dai(struct snd_soc_dai *dai)
304 {
305 struct fsi_master *master = snd_soc_dai_get_drvdata(dai);
306
307 if (dai->id == 0)
308 return &master->fsia;
309 else
310 return &master->fsib;
311 }
312
313 static struct fsi_priv *fsi_get_priv(struct snd_pcm_substream *substream)
314 {
315 return fsi_get_priv_frm_dai(fsi_get_dai(substream));
316 }
317
318 static set_rate_func fsi_get_info_set_rate(struct fsi_master *master)
319 {
320 if (!master->info)
321 return NULL;
322
323 return master->info->set_rate;
324 }
325
326 static u32 fsi_get_info_flags(struct fsi_priv *fsi)
327 {
328 int is_porta = fsi_is_port_a(fsi);
329 struct fsi_master *master = fsi_get_master(fsi);
330
331 if (!master->info)
332 return 0;
333
334 return is_porta ? master->info->porta_flags :
335 master->info->portb_flags;
336 }
337
338 static inline int fsi_stream_is_play(int stream)
339 {
340 return stream == SNDRV_PCM_STREAM_PLAYBACK;
341 }
342
343 static inline int fsi_is_play(struct snd_pcm_substream *substream)
344 {
345 return fsi_stream_is_play(substream->stream);
346 }
347
348 static inline struct fsi_stream *fsi_get_stream(struct fsi_priv *fsi,
349 int is_play)
350 {
351 return is_play ? &fsi->playback : &fsi->capture;
352 }
353
354 static u32 fsi_get_port_shift(struct fsi_priv *fsi, int is_play)
355 {
356 int is_porta = fsi_is_port_a(fsi);
357 u32 shift;
358
359 if (is_porta)
360 shift = is_play ? AO_SHIFT : AI_SHIFT;
361 else
362 shift = is_play ? BO_SHIFT : BI_SHIFT;
363
364 return shift;
365 }
366
367 static int fsi_frame2sample(struct fsi_priv *fsi, int frames)
368 {
369 return frames * fsi->chan_num;
370 }
371
372 static int fsi_sample2frame(struct fsi_priv *fsi, int samples)
373 {
374 return samples / fsi->chan_num;
375 }
376
377 static int fsi_stream_is_working(struct fsi_priv *fsi,
378 int is_play)
379 {
380 struct fsi_stream *io = fsi_get_stream(fsi, is_play);
381 struct fsi_master *master = fsi_get_master(fsi);
382 unsigned long flags;
383 int ret;
384
385 spin_lock_irqsave(&master->lock, flags);
386 ret = !!io->substream;
387 spin_unlock_irqrestore(&master->lock, flags);
388
389 return ret;
390 }
391
392 static void fsi_stream_push(struct fsi_priv *fsi,
393 int is_play,
394 struct snd_pcm_substream *substream)
395 {
396 struct fsi_stream *io = fsi_get_stream(fsi, is_play);
397 struct snd_pcm_runtime *runtime = substream->runtime;
398 struct fsi_master *master = fsi_get_master(fsi);
399 unsigned long flags;
400
401 spin_lock_irqsave(&master->lock, flags);
402 io->substream = substream;
403 io->buff_sample_capa = fsi_frame2sample(fsi, runtime->buffer_size);
404 io->buff_sample_pos = 0;
405 io->period_samples = fsi_frame2sample(fsi, runtime->period_size);
406 io->period_pos = 0;
407 io->oerr_num = -1; /* ignore 1st err */
408 io->uerr_num = -1; /* ignore 1st err */
409 spin_unlock_irqrestore(&master->lock, flags);
410 }
411
412 static void fsi_stream_pop(struct fsi_priv *fsi, int is_play)
413 {
414 struct fsi_stream *io = fsi_get_stream(fsi, is_play);
415 struct snd_soc_dai *dai = fsi_get_dai(io->substream);
416 struct fsi_master *master = fsi_get_master(fsi);
417 unsigned long flags;
418
419 spin_lock_irqsave(&master->lock, flags);
420
421 if (io->oerr_num > 0)
422 dev_err(dai->dev, "over_run = %d\n", io->oerr_num);
423
424 if (io->uerr_num > 0)
425 dev_err(dai->dev, "under_run = %d\n", io->uerr_num);
426
427 io->substream = NULL;
428 io->buff_sample_capa = 0;
429 io->buff_sample_pos = 0;
430 io->period_samples = 0;
431 io->period_pos = 0;
432 io->oerr_num = 0;
433 io->uerr_num = 0;
434 spin_unlock_irqrestore(&master->lock, flags);
435 }
436
437 static int fsi_get_current_fifo_samples(struct fsi_priv *fsi, int is_play)
438 {
439 u32 status;
440 int frames;
441
442 status = is_play ?
443 fsi_reg_read(fsi, DOFF_ST) :
444 fsi_reg_read(fsi, DIFF_ST);
445
446 frames = 0x1ff & (status >> 8);
447
448 return fsi_frame2sample(fsi, frames);
449 }
450
451 static void fsi_count_fifo_err(struct fsi_priv *fsi)
452 {
453 u32 ostatus = fsi_reg_read(fsi, DOFF_ST);
454 u32 istatus = fsi_reg_read(fsi, DIFF_ST);
455
456 if (ostatus & ERR_OVER)
457 fsi->playback.oerr_num++;
458
459 if (ostatus & ERR_UNDER)
460 fsi->playback.uerr_num++;
461
462 if (istatus & ERR_OVER)
463 fsi->capture.oerr_num++;
464
465 if (istatus & ERR_UNDER)
466 fsi->capture.uerr_num++;
467
468 fsi_reg_write(fsi, DOFF_ST, 0);
469 fsi_reg_write(fsi, DIFF_ST, 0);
470 }
471
472 /*
473 * dma function
474 */
475
476 static u8 *fsi_dma_get_area(struct fsi_priv *fsi, int stream)
477 {
478 int is_play = fsi_stream_is_play(stream);
479 struct fsi_stream *io = fsi_get_stream(fsi, is_play);
480 struct snd_pcm_runtime *runtime = io->substream->runtime;
481
482 return runtime->dma_area +
483 samples_to_bytes(runtime, io->buff_sample_pos);
484 }
485
486 static void fsi_dma_soft_push16(struct fsi_priv *fsi, int num)
487 {
488 u16 *start;
489 int i;
490
491 start = (u16 *)fsi_dma_get_area(fsi, SNDRV_PCM_STREAM_PLAYBACK);
492
493 for (i = 0; i < num; i++)
494 fsi_reg_write(fsi, DODT, ((u32)*(start + i) << 8));
495 }
496
497 static void fsi_dma_soft_pop16(struct fsi_priv *fsi, int num)
498 {
499 u16 *start;
500 int i;
501
502 start = (u16 *)fsi_dma_get_area(fsi, SNDRV_PCM_STREAM_CAPTURE);
503
504
505 for (i = 0; i < num; i++)
506 *(start + i) = (u16)(fsi_reg_read(fsi, DIDT) >> 8);
507 }
508
509 static void fsi_dma_soft_push32(struct fsi_priv *fsi, int num)
510 {
511 u32 *start;
512 int i;
513
514 start = (u32 *)fsi_dma_get_area(fsi, SNDRV_PCM_STREAM_PLAYBACK);
515
516
517 for (i = 0; i < num; i++)
518 fsi_reg_write(fsi, DODT, *(start + i));
519 }
520
521 static void fsi_dma_soft_pop32(struct fsi_priv *fsi, int num)
522 {
523 u32 *start;
524 int i;
525
526 start = (u32 *)fsi_dma_get_area(fsi, SNDRV_PCM_STREAM_CAPTURE);
527
528 for (i = 0; i < num; i++)
529 *(start + i) = fsi_reg_read(fsi, DIDT);
530 }
531
532 /*
533 * irq function
534 */
535
536 static void fsi_irq_enable(struct fsi_priv *fsi, int is_play)
537 {
538 u32 data = AB_IO(1, fsi_get_port_shift(fsi, is_play));
539 struct fsi_master *master = fsi_get_master(fsi);
540
541 fsi_core_mask_set(master, imsk, data, data);
542 fsi_core_mask_set(master, iemsk, data, data);
543 }
544
545 static void fsi_irq_disable(struct fsi_priv *fsi, int is_play)
546 {
547 u32 data = AB_IO(1, fsi_get_port_shift(fsi, is_play));
548 struct fsi_master *master = fsi_get_master(fsi);
549
550 fsi_core_mask_set(master, imsk, data, 0);
551 fsi_core_mask_set(master, iemsk, data, 0);
552 }
553
554 static u32 fsi_irq_get_status(struct fsi_master *master)
555 {
556 return fsi_core_read(master, int_st);
557 }
558
559 static void fsi_irq_clear_status(struct fsi_priv *fsi)
560 {
561 u32 data = 0;
562 struct fsi_master *master = fsi_get_master(fsi);
563
564 data |= AB_IO(1, fsi_get_port_shift(fsi, 0));
565 data |= AB_IO(1, fsi_get_port_shift(fsi, 1));
566
567 /* clear interrupt factor */
568 fsi_core_mask_set(master, int_st, data, 0);
569 }
570
571 /*
572 * SPDIF master clock function
573 *
574 * These functions are used later FSI2
575 */
576 static void fsi_spdif_clk_ctrl(struct fsi_priv *fsi, int enable)
577 {
578 struct fsi_master *master = fsi_get_master(fsi);
579 u32 mask, val;
580
581 if (master->core->ver < 2) {
582 pr_err("fsi: register access err (%s)\n", __func__);
583 return;
584 }
585
586 mask = BP | SE;
587 val = enable ? mask : 0;
588
589 fsi_is_port_a(fsi) ?
590 fsi_core_mask_set(master, a_mclk, mask, val) :
591 fsi_core_mask_set(master, b_mclk, mask, val);
592 }
593
594 /*
595 * clock function
596 */
597 static int fsi_set_master_clk(struct device *dev, struct fsi_priv *fsi,
598 long rate, int enable)
599 {
600 struct fsi_master *master = fsi_get_master(fsi);
601 set_rate_func set_rate = fsi_get_info_set_rate(master);
602 int fsi_ver = master->core->ver;
603 int ret;
604
605 ret = set_rate(dev, fsi_is_port_a(fsi), rate, enable);
606 if (ret < 0) /* error */
607 return ret;
608
609 if (!enable)
610 return 0;
611
612 if (ret > 0) {
613 u32 data = 0;
614
615 switch (ret & SH_FSI_ACKMD_MASK) {
616 default:
617 /* FALL THROUGH */
618 case SH_FSI_ACKMD_512:
619 data |= (0x0 << 12);
620 break;
621 case SH_FSI_ACKMD_256:
622 data |= (0x1 << 12);
623 break;
624 case SH_FSI_ACKMD_128:
625 data |= (0x2 << 12);
626 break;
627 case SH_FSI_ACKMD_64:
628 data |= (0x3 << 12);
629 break;
630 case SH_FSI_ACKMD_32:
631 if (fsi_ver < 2)
632 dev_err(dev, "unsupported ACKMD\n");
633 else
634 data |= (0x4 << 12);
635 break;
636 }
637
638 switch (ret & SH_FSI_BPFMD_MASK) {
639 default:
640 /* FALL THROUGH */
641 case SH_FSI_BPFMD_32:
642 data |= (0x0 << 8);
643 break;
644 case SH_FSI_BPFMD_64:
645 data |= (0x1 << 8);
646 break;
647 case SH_FSI_BPFMD_128:
648 data |= (0x2 << 8);
649 break;
650 case SH_FSI_BPFMD_256:
651 data |= (0x3 << 8);
652 break;
653 case SH_FSI_BPFMD_512:
654 data |= (0x4 << 8);
655 break;
656 case SH_FSI_BPFMD_16:
657 if (fsi_ver < 2)
658 dev_err(dev, "unsupported ACKMD\n");
659 else
660 data |= (0x7 << 8);
661 break;
662 }
663
664 fsi_reg_mask_set(fsi, CKG1, (ACKMD_MASK | BPFMD_MASK) , data);
665 udelay(10);
666 ret = 0;
667 }
668
669 return ret;
670 }
671
672 #define fsi_port_start(f, i) __fsi_port_clk_ctrl(f, i, 1)
673 #define fsi_port_stop(f, i) __fsi_port_clk_ctrl(f, i, 0)
674 static void __fsi_port_clk_ctrl(struct fsi_priv *fsi, int is_play, int enable)
675 {
676 struct fsi_master *master = fsi_get_master(fsi);
677 u32 clk = fsi_is_port_a(fsi) ? CRA : CRB;
678
679 if (enable)
680 fsi_irq_enable(fsi, is_play);
681 else
682 fsi_irq_disable(fsi, is_play);
683
684 if (fsi_is_clk_master(fsi))
685 fsi_master_mask_set(master, CLK_RST, clk, (enable) ? clk : 0);
686 }
687
688 /*
689 * ctrl function
690 */
691 static void fsi_fifo_init(struct fsi_priv *fsi,
692 int is_play,
693 struct device *dev)
694 {
695 struct fsi_master *master = fsi_get_master(fsi);
696 struct fsi_stream *io = fsi_get_stream(fsi, is_play);
697 u32 shift, i;
698 int frame_capa;
699
700 /* get on-chip RAM capacity */
701 shift = fsi_master_read(master, FIFO_SZ);
702 shift >>= fsi_get_port_shift(fsi, is_play);
703 shift &= FIFO_SZ_MASK;
704 frame_capa = 256 << shift;
705 dev_dbg(dev, "fifo = %d words\n", frame_capa);
706
707 /*
708 * The maximum number of sample data varies depending
709 * on the number of channels selected for the format.
710 *
711 * FIFOs are used in 4-channel units in 3-channel mode
712 * and in 8-channel units in 5- to 7-channel mode
713 * meaning that more FIFOs than the required size of DPRAM
714 * are used.
715 *
716 * ex) if 256 words of DP-RAM is connected
717 * 1 channel: 256 (256 x 1 = 256)
718 * 2 channels: 128 (128 x 2 = 256)
719 * 3 channels: 64 ( 64 x 3 = 192)
720 * 4 channels: 64 ( 64 x 4 = 256)
721 * 5 channels: 32 ( 32 x 5 = 160)
722 * 6 channels: 32 ( 32 x 6 = 192)
723 * 7 channels: 32 ( 32 x 7 = 224)
724 * 8 channels: 32 ( 32 x 8 = 256)
725 */
726 for (i = 1; i < fsi->chan_num; i <<= 1)
727 frame_capa >>= 1;
728 dev_dbg(dev, "%d channel %d store\n",
729 fsi->chan_num, frame_capa);
730
731 io->fifo_sample_capa = fsi_frame2sample(fsi, frame_capa);
732
733 /*
734 * set interrupt generation factor
735 * clear FIFO
736 */
737 if (is_play) {
738 fsi_reg_write(fsi, DOFF_CTL, IRQ_HALF);
739 fsi_reg_mask_set(fsi, DOFF_CTL, FIFO_CLR, FIFO_CLR);
740 } else {
741 fsi_reg_write(fsi, DIFF_CTL, IRQ_HALF);
742 fsi_reg_mask_set(fsi, DIFF_CTL, FIFO_CLR, FIFO_CLR);
743 }
744 }
745
746 static int fsi_fifo_data_ctrl(struct fsi_priv *fsi, int stream)
747 {
748 struct snd_pcm_runtime *runtime;
749 struct snd_pcm_substream *substream = NULL;
750 int is_play = fsi_stream_is_play(stream);
751 struct fsi_stream *io = fsi_get_stream(fsi, is_play);
752 int sample_residues;
753 int sample_width;
754 int samples;
755 int samples_max;
756 int over_period;
757 void (*fn)(struct fsi_priv *fsi, int size);
758
759 if (!fsi ||
760 !io->substream ||
761 !io->substream->runtime)
762 return -EINVAL;
763
764 over_period = 0;
765 substream = io->substream;
766 runtime = substream->runtime;
767
768 /* FSI FIFO has limit.
769 * So, this driver can not send periods data at a time
770 */
771 if (io->buff_sample_pos >=
772 io->period_samples * (io->period_pos + 1)) {
773
774 over_period = 1;
775 io->period_pos = (io->period_pos + 1) % runtime->periods;
776
777 if (0 == io->period_pos)
778 io->buff_sample_pos = 0;
779 }
780
781 /* get 1 sample data width */
782 sample_width = samples_to_bytes(runtime, 1);
783
784 /* get number of residue samples */
785 sample_residues = io->buff_sample_capa - io->buff_sample_pos;
786
787 if (is_play) {
788 /*
789 * for play-back
790 *
791 * samples_max : number of FSI fifo free samples space
792 * samples : number of ALSA residue samples
793 */
794 samples_max = io->fifo_sample_capa;
795 samples_max -= fsi_get_current_fifo_samples(fsi, is_play);
796
797 samples = sample_residues;
798
799 switch (sample_width) {
800 case 2:
801 fn = fsi_dma_soft_push16;
802 break;
803 case 4:
804 fn = fsi_dma_soft_push32;
805 break;
806 default:
807 return -EINVAL;
808 }
809 } else {
810 /*
811 * for capture
812 *
813 * samples_max : number of ALSA free samples space
814 * samples : number of samples in FSI fifo
815 */
816 samples_max = sample_residues;
817 samples = fsi_get_current_fifo_samples(fsi, is_play);
818
819 switch (sample_width) {
820 case 2:
821 fn = fsi_dma_soft_pop16;
822 break;
823 case 4:
824 fn = fsi_dma_soft_pop32;
825 break;
826 default:
827 return -EINVAL;
828 }
829 }
830
831 samples = min(samples, samples_max);
832
833 fn(fsi, samples);
834
835 /* update buff_sample_pos */
836 io->buff_sample_pos += samples;
837
838 if (over_period)
839 snd_pcm_period_elapsed(substream);
840
841 return 0;
842 }
843
844 static int fsi_data_pop(struct fsi_priv *fsi)
845 {
846 return fsi_fifo_data_ctrl(fsi, SNDRV_PCM_STREAM_CAPTURE);
847 }
848
849 static int fsi_data_push(struct fsi_priv *fsi)
850 {
851 return fsi_fifo_data_ctrl(fsi, SNDRV_PCM_STREAM_PLAYBACK);
852 }
853
854 static irqreturn_t fsi_interrupt(int irq, void *data)
855 {
856 struct fsi_master *master = data;
857 u32 int_st = fsi_irq_get_status(master);
858
859 /* clear irq status */
860 fsi_master_mask_set(master, SOFT_RST, IR, 0);
861 fsi_master_mask_set(master, SOFT_RST, IR, IR);
862
863 if (int_st & AB_IO(1, AO_SHIFT))
864 fsi_data_push(&master->fsia);
865 if (int_st & AB_IO(1, BO_SHIFT))
866 fsi_data_push(&master->fsib);
867 if (int_st & AB_IO(1, AI_SHIFT))
868 fsi_data_pop(&master->fsia);
869 if (int_st & AB_IO(1, BI_SHIFT))
870 fsi_data_pop(&master->fsib);
871
872 fsi_count_fifo_err(&master->fsia);
873 fsi_count_fifo_err(&master->fsib);
874
875 fsi_irq_clear_status(&master->fsia);
876 fsi_irq_clear_status(&master->fsib);
877
878 return IRQ_HANDLED;
879 }
880
881 /*
882 * dai ops
883 */
884
885 static int fsi_hw_startup(struct fsi_priv *fsi,
886 int is_play,
887 struct device *dev)
888 {
889 u32 flags = fsi_get_info_flags(fsi);
890 u32 data = 0;
891
892 pm_runtime_get_sync(dev);
893
894 /* clock setting */
895 if (fsi_is_clk_master(fsi))
896 data = DIMD | DOMD;
897
898 fsi_reg_mask_set(fsi, CKG1, (DIMD | DOMD), data);
899
900 /* clock inversion (CKG2) */
901 data = 0;
902 if (SH_FSI_LRM_INV & flags)
903 data |= 1 << 12;
904 if (SH_FSI_BRM_INV & flags)
905 data |= 1 << 8;
906 if (SH_FSI_LRS_INV & flags)
907 data |= 1 << 4;
908 if (SH_FSI_BRS_INV & flags)
909 data |= 1 << 0;
910
911 fsi_reg_write(fsi, CKG2, data);
912
913 /* set format */
914 fsi_reg_write(fsi, DO_FMT, fsi->do_fmt);
915 fsi_reg_write(fsi, DI_FMT, fsi->di_fmt);
916
917 /* spdif ? */
918 if (fsi_is_spdif(fsi)) {
919 fsi_spdif_clk_ctrl(fsi, 1);
920 fsi_reg_mask_set(fsi, OUT_SEL, DMMD, DMMD);
921 }
922
923 /* irq clear */
924 fsi_irq_disable(fsi, is_play);
925 fsi_irq_clear_status(fsi);
926
927 /* fifo init */
928 fsi_fifo_init(fsi, is_play, dev);
929
930 return 0;
931 }
932
933 static void fsi_hw_shutdown(struct fsi_priv *fsi,
934 int is_play,
935 struct device *dev)
936 {
937 if (fsi_is_clk_master(fsi))
938 fsi_set_master_clk(dev, fsi, fsi->rate, 0);
939
940 pm_runtime_put_sync(dev);
941 }
942
943 static int fsi_dai_startup(struct snd_pcm_substream *substream,
944 struct snd_soc_dai *dai)
945 {
946 struct fsi_priv *fsi = fsi_get_priv(substream);
947 int is_play = fsi_is_play(substream);
948
949 return fsi_hw_startup(fsi, is_play, dai->dev);
950 }
951
952 static void fsi_dai_shutdown(struct snd_pcm_substream *substream,
953 struct snd_soc_dai *dai)
954 {
955 struct fsi_priv *fsi = fsi_get_priv(substream);
956 int is_play = fsi_is_play(substream);
957
958 fsi_hw_shutdown(fsi, is_play, dai->dev);
959 fsi->rate = 0;
960 }
961
962 static int fsi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
963 struct snd_soc_dai *dai)
964 {
965 struct fsi_priv *fsi = fsi_get_priv(substream);
966 int is_play = fsi_is_play(substream);
967 int ret = 0;
968
969 switch (cmd) {
970 case SNDRV_PCM_TRIGGER_START:
971 fsi_stream_push(fsi, is_play, substream);
972 ret = is_play ? fsi_data_push(fsi) : fsi_data_pop(fsi);
973 fsi_port_start(fsi, is_play);
974 break;
975 case SNDRV_PCM_TRIGGER_STOP:
976 fsi_port_stop(fsi, is_play);
977 fsi_stream_pop(fsi, is_play);
978 break;
979 }
980
981 return ret;
982 }
983
984 static int fsi_set_fmt_dai(struct fsi_priv *fsi, unsigned int fmt)
985 {
986 u32 data = 0;
987
988 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
989 case SND_SOC_DAIFMT_I2S:
990 data = CR_I2S;
991 fsi->chan_num = 2;
992 break;
993 case SND_SOC_DAIFMT_LEFT_J:
994 data = CR_PCM;
995 fsi->chan_num = 2;
996 break;
997 default:
998 return -EINVAL;
999 }
1000
1001 fsi->do_fmt = data;
1002 fsi->di_fmt = data;
1003
1004 return 0;
1005 }
1006
1007 static int fsi_set_fmt_spdif(struct fsi_priv *fsi)
1008 {
1009 struct fsi_master *master = fsi_get_master(fsi);
1010 u32 data = 0;
1011
1012 if (master->core->ver < 2)
1013 return -EINVAL;
1014
1015 data = CR_BWS_16 | CR_DTMD_SPDIF_PCM | CR_PCM;
1016 fsi->chan_num = 2;
1017 fsi->spdif = 1;
1018
1019 fsi->do_fmt = data;
1020 fsi->di_fmt = data;
1021
1022 return 0;
1023 }
1024
1025 static int fsi_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
1026 {
1027 struct fsi_priv *fsi = fsi_get_priv_frm_dai(dai);
1028 struct fsi_master *master = fsi_get_master(fsi);
1029 set_rate_func set_rate = fsi_get_info_set_rate(master);
1030 u32 flags = fsi_get_info_flags(fsi);
1031 int ret;
1032
1033 /* set master/slave audio interface */
1034 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
1035 case SND_SOC_DAIFMT_CBM_CFM:
1036 fsi->clk_master = 1;
1037 break;
1038 case SND_SOC_DAIFMT_CBS_CFS:
1039 break;
1040 default:
1041 return -EINVAL;
1042 }
1043
1044 if (fsi_is_clk_master(fsi) && !set_rate) {
1045 dev_err(dai->dev, "platform doesn't have set_rate\n");
1046 return -EINVAL;
1047 }
1048
1049 /* set format */
1050 switch (flags & SH_FSI_FMT_MASK) {
1051 case SH_FSI_FMT_DAI:
1052 ret = fsi_set_fmt_dai(fsi, fmt & SND_SOC_DAIFMT_FORMAT_MASK);
1053 break;
1054 case SH_FSI_FMT_SPDIF:
1055 ret = fsi_set_fmt_spdif(fsi);
1056 break;
1057 default:
1058 ret = -EINVAL;
1059 }
1060
1061 return ret;
1062 }
1063
1064 static int fsi_dai_hw_params(struct snd_pcm_substream *substream,
1065 struct snd_pcm_hw_params *params,
1066 struct snd_soc_dai *dai)
1067 {
1068 struct fsi_priv *fsi = fsi_get_priv(substream);
1069 long rate = params_rate(params);
1070 int ret;
1071
1072 if (!fsi_is_clk_master(fsi))
1073 return 0;
1074
1075 ret = fsi_set_master_clk(dai->dev, fsi, rate, 1);
1076 if (ret < 0)
1077 return ret;
1078
1079 fsi->rate = rate;
1080
1081 return ret;
1082 }
1083
1084 static struct snd_soc_dai_ops fsi_dai_ops = {
1085 .startup = fsi_dai_startup,
1086 .shutdown = fsi_dai_shutdown,
1087 .trigger = fsi_dai_trigger,
1088 .set_fmt = fsi_dai_set_fmt,
1089 .hw_params = fsi_dai_hw_params,
1090 };
1091
1092 /*
1093 * pcm ops
1094 */
1095
1096 static struct snd_pcm_hardware fsi_pcm_hardware = {
1097 .info = SNDRV_PCM_INFO_INTERLEAVED |
1098 SNDRV_PCM_INFO_MMAP |
1099 SNDRV_PCM_INFO_MMAP_VALID |
1100 SNDRV_PCM_INFO_PAUSE,
1101 .formats = FSI_FMTS,
1102 .rates = FSI_RATES,
1103 .rate_min = 8000,
1104 .rate_max = 192000,
1105 .channels_min = 1,
1106 .channels_max = 2,
1107 .buffer_bytes_max = 64 * 1024,
1108 .period_bytes_min = 32,
1109 .period_bytes_max = 8192,
1110 .periods_min = 1,
1111 .periods_max = 32,
1112 .fifo_size = 256,
1113 };
1114
1115 static int fsi_pcm_open(struct snd_pcm_substream *substream)
1116 {
1117 struct snd_pcm_runtime *runtime = substream->runtime;
1118 int ret = 0;
1119
1120 snd_soc_set_runtime_hwparams(substream, &fsi_pcm_hardware);
1121
1122 ret = snd_pcm_hw_constraint_integer(runtime,
1123 SNDRV_PCM_HW_PARAM_PERIODS);
1124
1125 return ret;
1126 }
1127
1128 static int fsi_hw_params(struct snd_pcm_substream *substream,
1129 struct snd_pcm_hw_params *hw_params)
1130 {
1131 return snd_pcm_lib_malloc_pages(substream,
1132 params_buffer_bytes(hw_params));
1133 }
1134
1135 static int fsi_hw_free(struct snd_pcm_substream *substream)
1136 {
1137 return snd_pcm_lib_free_pages(substream);
1138 }
1139
1140 static snd_pcm_uframes_t fsi_pointer(struct snd_pcm_substream *substream)
1141 {
1142 struct fsi_priv *fsi = fsi_get_priv(substream);
1143 struct fsi_stream *io = fsi_get_stream(fsi, fsi_is_play(substream));
1144 int samples_pos = io->buff_sample_pos - 1;
1145
1146 if (samples_pos < 0)
1147 samples_pos = 0;
1148
1149 return fsi_sample2frame(fsi, samples_pos);
1150 }
1151
1152 static struct snd_pcm_ops fsi_pcm_ops = {
1153 .open = fsi_pcm_open,
1154 .ioctl = snd_pcm_lib_ioctl,
1155 .hw_params = fsi_hw_params,
1156 .hw_free = fsi_hw_free,
1157 .pointer = fsi_pointer,
1158 };
1159
1160 /*
1161 * snd_soc_platform
1162 */
1163
1164 #define PREALLOC_BUFFER (32 * 1024)
1165 #define PREALLOC_BUFFER_MAX (32 * 1024)
1166
1167 static void fsi_pcm_free(struct snd_pcm *pcm)
1168 {
1169 snd_pcm_lib_preallocate_free_for_all(pcm);
1170 }
1171
1172 static int fsi_pcm_new(struct snd_soc_pcm_runtime *rtd)
1173 {
1174 struct snd_pcm *pcm = rtd->pcm;
1175
1176 /*
1177 * dont use SNDRV_DMA_TYPE_DEV, since it will oops the SH kernel
1178 * in MMAP mode (i.e. aplay -M)
1179 */
1180 return snd_pcm_lib_preallocate_pages_for_all(
1181 pcm,
1182 SNDRV_DMA_TYPE_CONTINUOUS,
1183 snd_dma_continuous_data(GFP_KERNEL),
1184 PREALLOC_BUFFER, PREALLOC_BUFFER_MAX);
1185 }
1186
1187 /*
1188 * alsa struct
1189 */
1190
1191 static struct snd_soc_dai_driver fsi_soc_dai[] = {
1192 {
1193 .name = "fsia-dai",
1194 .playback = {
1195 .rates = FSI_RATES,
1196 .formats = FSI_FMTS,
1197 .channels_min = 1,
1198 .channels_max = 8,
1199 },
1200 .capture = {
1201 .rates = FSI_RATES,
1202 .formats = FSI_FMTS,
1203 .channels_min = 1,
1204 .channels_max = 8,
1205 },
1206 .ops = &fsi_dai_ops,
1207 },
1208 {
1209 .name = "fsib-dai",
1210 .playback = {
1211 .rates = FSI_RATES,
1212 .formats = FSI_FMTS,
1213 .channels_min = 1,
1214 .channels_max = 8,
1215 },
1216 .capture = {
1217 .rates = FSI_RATES,
1218 .formats = FSI_FMTS,
1219 .channels_min = 1,
1220 .channels_max = 8,
1221 },
1222 .ops = &fsi_dai_ops,
1223 },
1224 };
1225
1226 static struct snd_soc_platform_driver fsi_soc_platform = {
1227 .ops = &fsi_pcm_ops,
1228 .pcm_new = fsi_pcm_new,
1229 .pcm_free = fsi_pcm_free,
1230 };
1231
1232 /*
1233 * platform function
1234 */
1235
1236 static int fsi_probe(struct platform_device *pdev)
1237 {
1238 struct fsi_master *master;
1239 const struct platform_device_id *id_entry;
1240 struct resource *res;
1241 unsigned int irq;
1242 int ret;
1243
1244 id_entry = pdev->id_entry;
1245 if (!id_entry) {
1246 dev_err(&pdev->dev, "unknown fsi device\n");
1247 return -ENODEV;
1248 }
1249
1250 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1251 irq = platform_get_irq(pdev, 0);
1252 if (!res || (int)irq <= 0) {
1253 dev_err(&pdev->dev, "Not enough FSI platform resources.\n");
1254 ret = -ENODEV;
1255 goto exit;
1256 }
1257
1258 master = kzalloc(sizeof(*master), GFP_KERNEL);
1259 if (!master) {
1260 dev_err(&pdev->dev, "Could not allocate master\n");
1261 ret = -ENOMEM;
1262 goto exit;
1263 }
1264
1265 master->base = ioremap_nocache(res->start, resource_size(res));
1266 if (!master->base) {
1267 ret = -ENXIO;
1268 dev_err(&pdev->dev, "Unable to ioremap FSI registers.\n");
1269 goto exit_kfree;
1270 }
1271
1272 /* master setting */
1273 master->irq = irq;
1274 master->info = pdev->dev.platform_data;
1275 master->core = (struct fsi_core *)id_entry->driver_data;
1276 spin_lock_init(&master->lock);
1277
1278 /* FSI A setting */
1279 master->fsia.base = master->base;
1280 master->fsia.master = master;
1281
1282 /* FSI B setting */
1283 master->fsib.base = master->base + 0x40;
1284 master->fsib.master = master;
1285
1286 pm_runtime_enable(&pdev->dev);
1287 dev_set_drvdata(&pdev->dev, master);
1288
1289 ret = request_irq(irq, &fsi_interrupt, 0,
1290 id_entry->name, master);
1291 if (ret) {
1292 dev_err(&pdev->dev, "irq request err\n");
1293 goto exit_iounmap;
1294 }
1295
1296 ret = snd_soc_register_platform(&pdev->dev, &fsi_soc_platform);
1297 if (ret < 0) {
1298 dev_err(&pdev->dev, "cannot snd soc register\n");
1299 goto exit_free_irq;
1300 }
1301
1302 ret = snd_soc_register_dais(&pdev->dev, fsi_soc_dai,
1303 ARRAY_SIZE(fsi_soc_dai));
1304 if (ret < 0) {
1305 dev_err(&pdev->dev, "cannot snd dai register\n");
1306 goto exit_snd_soc;
1307 }
1308
1309 return ret;
1310
1311 exit_snd_soc:
1312 snd_soc_unregister_platform(&pdev->dev);
1313 exit_free_irq:
1314 free_irq(irq, master);
1315 exit_iounmap:
1316 iounmap(master->base);
1317 pm_runtime_disable(&pdev->dev);
1318 exit_kfree:
1319 kfree(master);
1320 master = NULL;
1321 exit:
1322 return ret;
1323 }
1324
1325 static int fsi_remove(struct platform_device *pdev)
1326 {
1327 struct fsi_master *master;
1328
1329 master = dev_get_drvdata(&pdev->dev);
1330
1331 free_irq(master->irq, master);
1332 pm_runtime_disable(&pdev->dev);
1333
1334 snd_soc_unregister_dais(&pdev->dev, ARRAY_SIZE(fsi_soc_dai));
1335 snd_soc_unregister_platform(&pdev->dev);
1336
1337 iounmap(master->base);
1338 kfree(master);
1339
1340 return 0;
1341 }
1342
1343 static void __fsi_suspend(struct fsi_priv *fsi,
1344 int is_play,
1345 struct device *dev)
1346 {
1347 if (!fsi_stream_is_working(fsi, is_play))
1348 return;
1349
1350 fsi_port_stop(fsi, is_play);
1351 fsi_hw_shutdown(fsi, is_play, dev);
1352 }
1353
1354 static void __fsi_resume(struct fsi_priv *fsi,
1355 int is_play,
1356 struct device *dev)
1357 {
1358 if (!fsi_stream_is_working(fsi, is_play))
1359 return;
1360
1361 fsi_hw_startup(fsi, is_play, dev);
1362
1363 if (fsi_is_clk_master(fsi) && fsi->rate)
1364 fsi_set_master_clk(dev, fsi, fsi->rate, 1);
1365
1366 fsi_port_start(fsi, is_play);
1367
1368 }
1369
1370 static int fsi_suspend(struct device *dev)
1371 {
1372 struct fsi_master *master = dev_get_drvdata(dev);
1373 struct fsi_priv *fsia = &master->fsia;
1374 struct fsi_priv *fsib = &master->fsib;
1375
1376 __fsi_suspend(fsia, 1, dev);
1377 __fsi_suspend(fsia, 0, dev);
1378
1379 __fsi_suspend(fsib, 1, dev);
1380 __fsi_suspend(fsib, 0, dev);
1381
1382 return 0;
1383 }
1384
1385 static int fsi_resume(struct device *dev)
1386 {
1387 struct fsi_master *master = dev_get_drvdata(dev);
1388 struct fsi_priv *fsia = &master->fsia;
1389 struct fsi_priv *fsib = &master->fsib;
1390
1391 __fsi_resume(fsia, 1, dev);
1392 __fsi_resume(fsia, 0, dev);
1393
1394 __fsi_resume(fsib, 1, dev);
1395 __fsi_resume(fsib, 0, dev);
1396
1397 return 0;
1398 }
1399
1400 static int fsi_runtime_nop(struct device *dev)
1401 {
1402 /* Runtime PM callback shared between ->runtime_suspend()
1403 * and ->runtime_resume(). Simply returns success.
1404 *
1405 * This driver re-initializes all registers after
1406 * pm_runtime_get_sync() anyway so there is no need
1407 * to save and restore registers here.
1408 */
1409 return 0;
1410 }
1411
1412 static struct dev_pm_ops fsi_pm_ops = {
1413 .suspend = fsi_suspend,
1414 .resume = fsi_resume,
1415 .runtime_suspend = fsi_runtime_nop,
1416 .runtime_resume = fsi_runtime_nop,
1417 };
1418
1419 static struct fsi_core fsi1_core = {
1420 .ver = 1,
1421
1422 /* Interrupt */
1423 .int_st = INT_ST,
1424 .iemsk = IEMSK,
1425 .imsk = IMSK,
1426 };
1427
1428 static struct fsi_core fsi2_core = {
1429 .ver = 2,
1430
1431 /* Interrupt */
1432 .int_st = CPU_INT_ST,
1433 .iemsk = CPU_IEMSK,
1434 .imsk = CPU_IMSK,
1435 .a_mclk = A_MST_CTLR,
1436 .b_mclk = B_MST_CTLR,
1437 };
1438
1439 static struct platform_device_id fsi_id_table[] = {
1440 { "sh_fsi", (kernel_ulong_t)&fsi1_core },
1441 { "sh_fsi2", (kernel_ulong_t)&fsi2_core },
1442 {},
1443 };
1444 MODULE_DEVICE_TABLE(platform, fsi_id_table);
1445
1446 static struct platform_driver fsi_driver = {
1447 .driver = {
1448 .name = "fsi-pcm-audio",
1449 .pm = &fsi_pm_ops,
1450 },
1451 .probe = fsi_probe,
1452 .remove = fsi_remove,
1453 .id_table = fsi_id_table,
1454 };
1455
1456 static int __init fsi_mobile_init(void)
1457 {
1458 return platform_driver_register(&fsi_driver);
1459 }
1460
1461 static void __exit fsi_mobile_exit(void)
1462 {
1463 platform_driver_unregister(&fsi_driver);
1464 }
1465
1466 module_init(fsi_mobile_init);
1467 module_exit(fsi_mobile_exit);
1468
1469 MODULE_LICENSE("GPL");
1470 MODULE_DESCRIPTION("SuperH onchip FSI audio driver");
1471 MODULE_AUTHOR("Kuninori Morimoto <morimoto.kuninori@renesas.com>");
1472 MODULE_ALIAS("platform:fsi-pcm-audio");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree