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Linux 4.16.11
[linux/fpc-iii.git] / sound / soc / fsl / fsl_spdif.c
blob4f7469c1864c2e34c7715e8de09806474c2c3f52
1 /*
2 * Freescale S/PDIF ALSA SoC Digital Audio Interface (DAI) driver
3 *
4 * Copyright (C) 2013 Freescale Semiconductor, Inc.
5 *
6 * Based on stmp3xxx_spdif_dai.c
7 * Vladimir Barinov <vbarinov@embeddedalley.com>
8 * Copyright 2008 SigmaTel, Inc
9 * Copyright 2008 Embedded Alley Solutions, Inc
10 *
11 * This file is licensed under the terms of the GNU General Public License
12 * version 2. This program is licensed "as is" without any warranty of any
13 * kind, whether express or implied.
14 */
15
16 #include <linux/bitrev.h>
17 #include <linux/clk.h>
18 #include <linux/module.h>
19 #include <linux/of_address.h>
20 #include <linux/of_device.h>
21 #include <linux/of_irq.h>
22 #include <linux/regmap.h>
23
24 #include <sound/asoundef.h>
25 #include <sound/dmaengine_pcm.h>
26 #include <sound/soc.h>
27
28 #include "fsl_spdif.h"
29 #include "imx-pcm.h"
30
31 #define FSL_SPDIF_TXFIFO_WML 0x8
32 #define FSL_SPDIF_RXFIFO_WML 0x8
33
34 #define INTR_FOR_PLAYBACK (INT_TXFIFO_RESYNC)
35 #define INTR_FOR_CAPTURE (INT_SYM_ERR | INT_BIT_ERR | INT_URX_FUL |\
36 INT_URX_OV | INT_QRX_FUL | INT_QRX_OV |\
37 INT_UQ_SYNC | INT_UQ_ERR | INT_RXFIFO_RESYNC |\
38 INT_LOSS_LOCK | INT_DPLL_LOCKED)
39
40 #define SIE_INTR_FOR(tx) (tx ? INTR_FOR_PLAYBACK : INTR_FOR_CAPTURE)
41
42 /* Index list for the values that has if (DPLL Locked) condition */
43 static u8 srpc_dpll_locked[] = { 0x0, 0x1, 0x2, 0x3, 0x4, 0xa, 0xb };
44 #define SRPC_NODPLL_START1 0x5
45 #define SRPC_NODPLL_START2 0xc
46
47 #define DEFAULT_RXCLK_SRC 1
48
49 /*
50 * SPDIF control structure
51 * Defines channel status, subcode and Q sub
52 */
53 struct spdif_mixer_control {
54 /* spinlock to access control data */
55 spinlock_t ctl_lock;
56
57 /* IEC958 channel tx status bit */
58 unsigned char ch_status[4];
59
60 /* User bits */
61 unsigned char subcode[2 * SPDIF_UBITS_SIZE];
62
63 /* Q subcode part of user bits */
64 unsigned char qsub[2 * SPDIF_QSUB_SIZE];
65
66 /* Buffer offset for U/Q */
67 u32 upos;
68 u32 qpos;
69
70 /* Ready buffer index of the two buffers */
71 u32 ready_buf;
72 };
73
74 /**
75 * fsl_spdif_priv: Freescale SPDIF private data
76 *
77 * @fsl_spdif_control: SPDIF control data
78 * @cpu_dai_drv: cpu dai driver
79 * @pdev: platform device pointer
80 * @regmap: regmap handler
81 * @dpll_locked: dpll lock flag
82 * @txrate: the best rates for playback
83 * @txclk_df: STC_TXCLK_DF dividers value for playback
84 * @sysclk_df: STC_SYSCLK_DF dividers value for playback
85 * @txclk_src: STC_TXCLK_SRC values for playback
86 * @rxclk_src: SRPC_CLKSRC_SEL values for capture
87 * @txclk: tx clock sources for playback
88 * @rxclk: rx clock sources for capture
89 * @coreclk: core clock for register access via DMA
90 * @sysclk: system clock for rx clock rate measurement
91 * @spbaclk: SPBA clock (optional, depending on SoC design)
92 * @dma_params_tx: DMA parameters for transmit channel
93 * @dma_params_rx: DMA parameters for receive channel
94 */
95 struct fsl_spdif_priv {
96 struct spdif_mixer_control fsl_spdif_control;
97 struct snd_soc_dai_driver cpu_dai_drv;
98 struct platform_device *pdev;
99 struct regmap *regmap;
100 bool dpll_locked;
101 u32 txrate[SPDIF_TXRATE_MAX];
102 u8 txclk_df[SPDIF_TXRATE_MAX];
103 u8 sysclk_df[SPDIF_TXRATE_MAX];
104 u8 txclk_src[SPDIF_TXRATE_MAX];
105 u8 rxclk_src;
106 struct clk *txclk[SPDIF_TXRATE_MAX];
107 struct clk *rxclk;
108 struct clk *coreclk;
109 struct clk *sysclk;
110 struct clk *spbaclk;
111 struct snd_dmaengine_dai_dma_data dma_params_tx;
112 struct snd_dmaengine_dai_dma_data dma_params_rx;
113 /* regcache for SRPC */
114 u32 regcache_srpc;
115 };
116
117 /* DPLL locked and lock loss interrupt handler */
118 static void spdif_irq_dpll_lock(struct fsl_spdif_priv *spdif_priv)
119 {
120 struct regmap *regmap = spdif_priv->regmap;
121 struct platform_device *pdev = spdif_priv->pdev;
122 u32 locked;
123
124 regmap_read(regmap, REG_SPDIF_SRPC, &locked);
125 locked &= SRPC_DPLL_LOCKED;
126
127 dev_dbg(&pdev->dev, "isr: Rx dpll %s \n",
128 locked ? "locked" : "loss lock");
129
130 spdif_priv->dpll_locked = locked ? true : false;
131 }
132
133 /* Receiver found illegal symbol interrupt handler */
134 static void spdif_irq_sym_error(struct fsl_spdif_priv *spdif_priv)
135 {
136 struct regmap *regmap = spdif_priv->regmap;
137 struct platform_device *pdev = spdif_priv->pdev;
138
139 dev_dbg(&pdev->dev, "isr: receiver found illegal symbol\n");
140
141 /* Clear illegal symbol if DPLL unlocked since no audio stream */
142 if (!spdif_priv->dpll_locked)
143 regmap_update_bits(regmap, REG_SPDIF_SIE, INT_SYM_ERR, 0);
144 }
145
146 /* U/Q Channel receive register full */
147 static void spdif_irq_uqrx_full(struct fsl_spdif_priv *spdif_priv, char name)
148 {
149 struct spdif_mixer_control *ctrl = &spdif_priv->fsl_spdif_control;
150 struct regmap *regmap = spdif_priv->regmap;
151 struct platform_device *pdev = spdif_priv->pdev;
152 u32 *pos, size, val, reg;
153
154 switch (name) {
155 case 'U':
156 pos = &ctrl->upos;
157 size = SPDIF_UBITS_SIZE;
158 reg = REG_SPDIF_SRU;
159 break;
160 case 'Q':
161 pos = &ctrl->qpos;
162 size = SPDIF_QSUB_SIZE;
163 reg = REG_SPDIF_SRQ;
164 break;
165 default:
166 dev_err(&pdev->dev, "unsupported channel name\n");
167 return;
168 }
169
170 dev_dbg(&pdev->dev, "isr: %c Channel receive register full\n", name);
171
172 if (*pos >= size * 2) {
173 *pos = 0;
174 } else if (unlikely((*pos % size) + 3 > size)) {
175 dev_err(&pdev->dev, "User bit receive buffer overflow\n");
176 return;
177 }
178
179 regmap_read(regmap, reg, &val);
180 ctrl->subcode[*pos++] = val >> 16;
181 ctrl->subcode[*pos++] = val >> 8;
182 ctrl->subcode[*pos++] = val;
183 }
184
185 /* U/Q Channel sync found */
186 static void spdif_irq_uq_sync(struct fsl_spdif_priv *spdif_priv)
187 {
188 struct spdif_mixer_control *ctrl = &spdif_priv->fsl_spdif_control;
189 struct platform_device *pdev = spdif_priv->pdev;
190
191 dev_dbg(&pdev->dev, "isr: U/Q Channel sync found\n");
192
193 /* U/Q buffer reset */
194 if (ctrl->qpos == 0)
195 return;
196
197 /* Set ready to this buffer */
198 ctrl->ready_buf = (ctrl->qpos - 1) / SPDIF_QSUB_SIZE + 1;
199 }
200
201 /* U/Q Channel framing error */
202 static void spdif_irq_uq_err(struct fsl_spdif_priv *spdif_priv)
203 {
204 struct spdif_mixer_control *ctrl = &spdif_priv->fsl_spdif_control;
205 struct regmap *regmap = spdif_priv->regmap;
206 struct platform_device *pdev = spdif_priv->pdev;
207 u32 val;
208
209 dev_dbg(&pdev->dev, "isr: U/Q Channel framing error\n");
210
211 /* Read U/Q data to clear the irq and do buffer reset */
212 regmap_read(regmap, REG_SPDIF_SRU, &val);
213 regmap_read(regmap, REG_SPDIF_SRQ, &val);
214
215 /* Drop this U/Q buffer */
216 ctrl->ready_buf = 0;
217 ctrl->upos = 0;
218 ctrl->qpos = 0;
219 }
220
221 /* Get spdif interrupt status and clear the interrupt */
222 static u32 spdif_intr_status_clear(struct fsl_spdif_priv *spdif_priv)
223 {
224 struct regmap *regmap = spdif_priv->regmap;
225 u32 val, val2;
226
227 regmap_read(regmap, REG_SPDIF_SIS, &val);
228 regmap_read(regmap, REG_SPDIF_SIE, &val2);
229
230 regmap_write(regmap, REG_SPDIF_SIC, val & val2);
231
232 return val;
233 }
234
235 static irqreturn_t spdif_isr(int irq, void *devid)
236 {
237 struct fsl_spdif_priv *spdif_priv = (struct fsl_spdif_priv *)devid;
238 struct platform_device *pdev = spdif_priv->pdev;
239 u32 sis;
240
241 sis = spdif_intr_status_clear(spdif_priv);
242
243 if (sis & INT_DPLL_LOCKED)
244 spdif_irq_dpll_lock(spdif_priv);
245
246 if (sis & INT_TXFIFO_UNOV)
247 dev_dbg(&pdev->dev, "isr: Tx FIFO under/overrun\n");
248
249 if (sis & INT_TXFIFO_RESYNC)
250 dev_dbg(&pdev->dev, "isr: Tx FIFO resync\n");
251
252 if (sis & INT_CNEW)
253 dev_dbg(&pdev->dev, "isr: cstatus new\n");
254
255 if (sis & INT_VAL_NOGOOD)
256 dev_dbg(&pdev->dev, "isr: validity flag no good\n");
257
258 if (sis & INT_SYM_ERR)
259 spdif_irq_sym_error(spdif_priv);
260
261 if (sis & INT_BIT_ERR)
262 dev_dbg(&pdev->dev, "isr: receiver found parity bit error\n");
263
264 if (sis & INT_URX_FUL)
265 spdif_irq_uqrx_full(spdif_priv, 'U');
266
267 if (sis & INT_URX_OV)
268 dev_dbg(&pdev->dev, "isr: U Channel receive register overrun\n");
269
270 if (sis & INT_QRX_FUL)
271 spdif_irq_uqrx_full(spdif_priv, 'Q');
272
273 if (sis & INT_QRX_OV)
274 dev_dbg(&pdev->dev, "isr: Q Channel receive register overrun\n");
275
276 if (sis & INT_UQ_SYNC)
277 spdif_irq_uq_sync(spdif_priv);
278
279 if (sis & INT_UQ_ERR)
280 spdif_irq_uq_err(spdif_priv);
281
282 if (sis & INT_RXFIFO_UNOV)
283 dev_dbg(&pdev->dev, "isr: Rx FIFO under/overrun\n");
284
285 if (sis & INT_RXFIFO_RESYNC)
286 dev_dbg(&pdev->dev, "isr: Rx FIFO resync\n");
287
288 if (sis & INT_LOSS_LOCK)
289 spdif_irq_dpll_lock(spdif_priv);
290
291 /* FIXME: Write Tx FIFO to clear TxEm */
292 if (sis & INT_TX_EM)
293 dev_dbg(&pdev->dev, "isr: Tx FIFO empty\n");
294
295 /* FIXME: Read Rx FIFO to clear RxFIFOFul */
296 if (sis & INT_RXFIFO_FUL)
297 dev_dbg(&pdev->dev, "isr: Rx FIFO full\n");
298
299 return IRQ_HANDLED;
300 }
301
302 static int spdif_softreset(struct fsl_spdif_priv *spdif_priv)
303 {
304 struct regmap *regmap = spdif_priv->regmap;
305 u32 val, cycle = 1000;
306
307 regcache_cache_bypass(regmap, true);
308
309 regmap_write(regmap, REG_SPDIF_SCR, SCR_SOFT_RESET);
310
311 /*
312 * RESET bit would be cleared after finishing its reset procedure,
313 * which typically lasts 8 cycles. 1000 cycles will keep it safe.
314 */
315 do {
316 regmap_read(regmap, REG_SPDIF_SCR, &val);
317 } while ((val & SCR_SOFT_RESET) && cycle--);
318
319 regcache_cache_bypass(regmap, false);
320 regcache_mark_dirty(regmap);
321 regcache_sync(regmap);
322
323 if (cycle)
324 return 0;
325 else
326 return -EBUSY;
327 }
328
329 static void spdif_set_cstatus(struct spdif_mixer_control *ctrl,
330 u8 mask, u8 cstatus)
331 {
332 ctrl->ch_status[3] &= ~mask;
333 ctrl->ch_status[3] |= cstatus & mask;
334 }
335
336 static void spdif_write_channel_status(struct fsl_spdif_priv *spdif_priv)
337 {
338 struct spdif_mixer_control *ctrl = &spdif_priv->fsl_spdif_control;
339 struct regmap *regmap = spdif_priv->regmap;
340 struct platform_device *pdev = spdif_priv->pdev;
341 u32 ch_status;
342
343 ch_status = (bitrev8(ctrl->ch_status[0]) << 16) |
344 (bitrev8(ctrl->ch_status[1]) << 8) |
345 bitrev8(ctrl->ch_status[2]);
346 regmap_write(regmap, REG_SPDIF_STCSCH, ch_status);
347
348 dev_dbg(&pdev->dev, "STCSCH: 0x%06x\n", ch_status);
349
350 ch_status = bitrev8(ctrl->ch_status[3]) << 16;
351 regmap_write(regmap, REG_SPDIF_STCSCL, ch_status);
352
353 dev_dbg(&pdev->dev, "STCSCL: 0x%06x\n", ch_status);
354 }
355
356 /* Set SPDIF PhaseConfig register for rx clock */
357 static int spdif_set_rx_clksrc(struct fsl_spdif_priv *spdif_priv,
358 enum spdif_gainsel gainsel, int dpll_locked)
359 {
360 struct regmap *regmap = spdif_priv->regmap;
361 u8 clksrc = spdif_priv->rxclk_src;
362
363 if (clksrc >= SRPC_CLKSRC_MAX || gainsel >= GAINSEL_MULTI_MAX)
364 return -EINVAL;
365
366 regmap_update_bits(regmap, REG_SPDIF_SRPC,
367 SRPC_CLKSRC_SEL_MASK | SRPC_GAINSEL_MASK,
368 SRPC_CLKSRC_SEL_SET(clksrc) | SRPC_GAINSEL_SET(gainsel));
369
370 return 0;
371 }
372
373 static int spdif_set_sample_rate(struct snd_pcm_substream *substream,
374 int sample_rate)
375 {
376 struct snd_soc_pcm_runtime *rtd = substream->private_data;
377 struct fsl_spdif_priv *spdif_priv = snd_soc_dai_get_drvdata(rtd->cpu_dai);
378 struct spdif_mixer_control *ctrl = &spdif_priv->fsl_spdif_control;
379 struct regmap *regmap = spdif_priv->regmap;
380 struct platform_device *pdev = spdif_priv->pdev;
381 unsigned long csfs = 0;
382 u32 stc, mask, rate;
383 u8 clk, txclk_df, sysclk_df;
384 int ret;
385
386 switch (sample_rate) {
387 case 32000:
388 rate = SPDIF_TXRATE_32000;
389 csfs = IEC958_AES3_CON_FS_32000;
390 break;
391 case 44100:
392 rate = SPDIF_TXRATE_44100;
393 csfs = IEC958_AES3_CON_FS_44100;
394 break;
395 case 48000:
396 rate = SPDIF_TXRATE_48000;
397 csfs = IEC958_AES3_CON_FS_48000;
398 break;
399 case 96000:
400 rate = SPDIF_TXRATE_96000;
401 csfs = IEC958_AES3_CON_FS_96000;
402 break;
403 case 192000:
404 rate = SPDIF_TXRATE_192000;
405 csfs = IEC958_AES3_CON_FS_192000;
406 break;
407 default:
408 dev_err(&pdev->dev, "unsupported sample rate %d\n", sample_rate);
409 return -EINVAL;
410 }
411
412 clk = spdif_priv->txclk_src[rate];
413 if (clk >= STC_TXCLK_SRC_MAX) {
414 dev_err(&pdev->dev, "tx clock source is out of range\n");
415 return -EINVAL;
416 }
417
418 txclk_df = spdif_priv->txclk_df[rate];
419 if (txclk_df == 0) {
420 dev_err(&pdev->dev, "the txclk_df can't be zero\n");
421 return -EINVAL;
422 }
423
424 sysclk_df = spdif_priv->sysclk_df[rate];
425
426 /* Don't mess up the clocks from other modules */
427 if (clk != STC_TXCLK_SPDIF_ROOT)
428 goto clk_set_bypass;
429
430 /* The S/PDIF block needs a clock of 64 * fs * txclk_df */
431 ret = clk_set_rate(spdif_priv->txclk[rate],
432 64 * sample_rate * txclk_df);
433 if (ret) {
434 dev_err(&pdev->dev, "failed to set tx clock rate\n");
435 return ret;
436 }
437
438 clk_set_bypass:
439 dev_dbg(&pdev->dev, "expected clock rate = %d\n",
440 (64 * sample_rate * txclk_df * sysclk_df));
441 dev_dbg(&pdev->dev, "actual clock rate = %ld\n",
442 clk_get_rate(spdif_priv->txclk[rate]));
443
444 /* set fs field in consumer channel status */
445 spdif_set_cstatus(ctrl, IEC958_AES3_CON_FS, csfs);
446
447 /* select clock source and divisor */
448 stc = STC_TXCLK_ALL_EN | STC_TXCLK_SRC_SET(clk) |
449 STC_TXCLK_DF(txclk_df) | STC_SYSCLK_DF(sysclk_df);
450 mask = STC_TXCLK_ALL_EN_MASK | STC_TXCLK_SRC_MASK |
451 STC_TXCLK_DF_MASK | STC_SYSCLK_DF_MASK;
452 regmap_update_bits(regmap, REG_SPDIF_STC, mask, stc);
453
454 dev_dbg(&pdev->dev, "set sample rate to %dHz for %dHz playback\n",
455 spdif_priv->txrate[rate], sample_rate);
456
457 return 0;
458 }
459
460 static int fsl_spdif_startup(struct snd_pcm_substream *substream,
461 struct snd_soc_dai *cpu_dai)
462 {
463 struct snd_soc_pcm_runtime *rtd = substream->private_data;
464 struct fsl_spdif_priv *spdif_priv = snd_soc_dai_get_drvdata(rtd->cpu_dai);
465 struct platform_device *pdev = spdif_priv->pdev;
466 struct regmap *regmap = spdif_priv->regmap;
467 u32 scr, mask;
468 int i;
469 int ret;
470
471 /* Reset module and interrupts only for first initialization */
472 if (!cpu_dai->active) {
473 ret = clk_prepare_enable(spdif_priv->coreclk);
474 if (ret) {
475 dev_err(&pdev->dev, "failed to enable core clock\n");
476 return ret;
477 }
478
479 if (!IS_ERR(spdif_priv->spbaclk)) {
480 ret = clk_prepare_enable(spdif_priv->spbaclk);
481 if (ret) {
482 dev_err(&pdev->dev, "failed to enable spba clock\n");
483 goto err_spbaclk;
484 }
485 }
486
487 ret = spdif_softreset(spdif_priv);
488 if (ret) {
489 dev_err(&pdev->dev, "failed to soft reset\n");
490 goto err;
491 }
492
493 /* Disable all the interrupts */
494 regmap_update_bits(regmap, REG_SPDIF_SIE, 0xffffff, 0);
495 }
496
497 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
498 scr = SCR_TXFIFO_AUTOSYNC | SCR_TXFIFO_CTRL_NORMAL |
499 SCR_TXSEL_NORMAL | SCR_USRC_SEL_CHIP |
500 SCR_TXFIFO_FSEL_IF8;
501 mask = SCR_TXFIFO_AUTOSYNC_MASK | SCR_TXFIFO_CTRL_MASK |
502 SCR_TXSEL_MASK | SCR_USRC_SEL_MASK |
503 SCR_TXFIFO_FSEL_MASK;
504 for (i = 0; i < SPDIF_TXRATE_MAX; i++) {
505 ret = clk_prepare_enable(spdif_priv->txclk[i]);
506 if (ret)
507 goto disable_txclk;
508 }
509 } else {
510 scr = SCR_RXFIFO_FSEL_IF8 | SCR_RXFIFO_AUTOSYNC;
511 mask = SCR_RXFIFO_FSEL_MASK | SCR_RXFIFO_AUTOSYNC_MASK|
512 SCR_RXFIFO_CTL_MASK | SCR_RXFIFO_OFF_MASK;
513 ret = clk_prepare_enable(spdif_priv->rxclk);
514 if (ret)
515 goto err;
516 }
517 regmap_update_bits(regmap, REG_SPDIF_SCR, mask, scr);
518
519 /* Power up SPDIF module */
520 regmap_update_bits(regmap, REG_SPDIF_SCR, SCR_LOW_POWER, 0);
521
522 return 0;
523
524 disable_txclk:
525 for (i--; i >= 0; i--)
526 clk_disable_unprepare(spdif_priv->txclk[i]);
527 err:
528 if (!IS_ERR(spdif_priv->spbaclk))
529 clk_disable_unprepare(spdif_priv->spbaclk);
530 err_spbaclk:
531 clk_disable_unprepare(spdif_priv->coreclk);
532
533 return ret;
534 }
535
536 static void fsl_spdif_shutdown(struct snd_pcm_substream *substream,
537 struct snd_soc_dai *cpu_dai)
538 {
539 struct snd_soc_pcm_runtime *rtd = substream->private_data;
540 struct fsl_spdif_priv *spdif_priv = snd_soc_dai_get_drvdata(rtd->cpu_dai);
541 struct regmap *regmap = spdif_priv->regmap;
542 u32 scr, mask, i;
543
544 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
545 scr = 0;
546 mask = SCR_TXFIFO_AUTOSYNC_MASK | SCR_TXFIFO_CTRL_MASK |
547 SCR_TXSEL_MASK | SCR_USRC_SEL_MASK |
548 SCR_TXFIFO_FSEL_MASK;
549 for (i = 0; i < SPDIF_TXRATE_MAX; i++)
550 clk_disable_unprepare(spdif_priv->txclk[i]);
551 } else {
552 scr = SCR_RXFIFO_OFF | SCR_RXFIFO_CTL_ZERO;
553 mask = SCR_RXFIFO_FSEL_MASK | SCR_RXFIFO_AUTOSYNC_MASK|
554 SCR_RXFIFO_CTL_MASK | SCR_RXFIFO_OFF_MASK;
555 clk_disable_unprepare(spdif_priv->rxclk);
556 }
557 regmap_update_bits(regmap, REG_SPDIF_SCR, mask, scr);
558
559 /* Power down SPDIF module only if tx&rx are both inactive */
560 if (!cpu_dai->active) {
561 spdif_intr_status_clear(spdif_priv);
562 regmap_update_bits(regmap, REG_SPDIF_SCR,
563 SCR_LOW_POWER, SCR_LOW_POWER);
564 if (!IS_ERR(spdif_priv->spbaclk))
565 clk_disable_unprepare(spdif_priv->spbaclk);
566 clk_disable_unprepare(spdif_priv->coreclk);
567 }
568 }
569
570 static int fsl_spdif_hw_params(struct snd_pcm_substream *substream,
571 struct snd_pcm_hw_params *params,
572 struct snd_soc_dai *dai)
573 {
574 struct snd_soc_pcm_runtime *rtd = substream->private_data;
575 struct fsl_spdif_priv *spdif_priv = snd_soc_dai_get_drvdata(rtd->cpu_dai);
576 struct spdif_mixer_control *ctrl = &spdif_priv->fsl_spdif_control;
577 struct platform_device *pdev = spdif_priv->pdev;
578 u32 sample_rate = params_rate(params);
579 int ret = 0;
580
581 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
582 ret = spdif_set_sample_rate(substream, sample_rate);
583 if (ret) {
584 dev_err(&pdev->dev, "%s: set sample rate failed: %d\n",
585 __func__, sample_rate);
586 return ret;
587 }
588 spdif_set_cstatus(ctrl, IEC958_AES3_CON_CLOCK,
589 IEC958_AES3_CON_CLOCK_1000PPM);
590 spdif_write_channel_status(spdif_priv);
591 } else {
592 /* Setup rx clock source */
593 ret = spdif_set_rx_clksrc(spdif_priv, SPDIF_DEFAULT_GAINSEL, 1);
594 }
595
596 return ret;
597 }
598
599 static int fsl_spdif_trigger(struct snd_pcm_substream *substream,
600 int cmd, struct snd_soc_dai *dai)
601 {
602 struct snd_soc_pcm_runtime *rtd = substream->private_data;
603 struct fsl_spdif_priv *spdif_priv = snd_soc_dai_get_drvdata(rtd->cpu_dai);
604 struct regmap *regmap = spdif_priv->regmap;
605 bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
606 u32 intr = SIE_INTR_FOR(tx);
607 u32 dmaen = SCR_DMA_xX_EN(tx);
608
609 switch (cmd) {
610 case SNDRV_PCM_TRIGGER_START:
611 case SNDRV_PCM_TRIGGER_RESUME:
612 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
613 regmap_update_bits(regmap, REG_SPDIF_SIE, intr, intr);
614 regmap_update_bits(regmap, REG_SPDIF_SCR, dmaen, dmaen);
615 break;
616 case SNDRV_PCM_TRIGGER_STOP:
617 case SNDRV_PCM_TRIGGER_SUSPEND:
618 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
619 regmap_update_bits(regmap, REG_SPDIF_SCR, dmaen, 0);
620 regmap_update_bits(regmap, REG_SPDIF_SIE, intr, 0);
621 break;
622 default:
623 return -EINVAL;
624 }
625
626 return 0;
627 }
628
629 static const struct snd_soc_dai_ops fsl_spdif_dai_ops = {
630 .startup = fsl_spdif_startup,
631 .hw_params = fsl_spdif_hw_params,
632 .trigger = fsl_spdif_trigger,
633 .shutdown = fsl_spdif_shutdown,
634 };
635
636
637 /*
638 * FSL SPDIF IEC958 controller(mixer) functions
639 *
640 * Channel status get/put control
641 * User bit value get/put control
642 * Valid bit value get control
643 * DPLL lock status get control
644 * User bit sync mode selection control
645 */
646
647 static int fsl_spdif_info(struct snd_kcontrol *kcontrol,
648 struct snd_ctl_elem_info *uinfo)
649 {
650 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
651 uinfo->count = 1;
652
653 return 0;
654 }
655
656 static int fsl_spdif_pb_get(struct snd_kcontrol *kcontrol,
657 struct snd_ctl_elem_value *uvalue)
658 {
659 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
660 struct fsl_spdif_priv *spdif_priv = snd_soc_dai_get_drvdata(cpu_dai);
661 struct spdif_mixer_control *ctrl = &spdif_priv->fsl_spdif_control;
662
663 uvalue->value.iec958.status[0] = ctrl->ch_status[0];
664 uvalue->value.iec958.status[1] = ctrl->ch_status[1];
665 uvalue->value.iec958.status[2] = ctrl->ch_status[2];
666 uvalue->value.iec958.status[3] = ctrl->ch_status[3];
667
668 return 0;
669 }
670
671 static int fsl_spdif_pb_put(struct snd_kcontrol *kcontrol,
672 struct snd_ctl_elem_value *uvalue)
673 {
674 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
675 struct fsl_spdif_priv *spdif_priv = snd_soc_dai_get_drvdata(cpu_dai);
676 struct spdif_mixer_control *ctrl = &spdif_priv->fsl_spdif_control;
677
678 ctrl->ch_status[0] = uvalue->value.iec958.status[0];
679 ctrl->ch_status[1] = uvalue->value.iec958.status[1];
680 ctrl->ch_status[2] = uvalue->value.iec958.status[2];
681 ctrl->ch_status[3] = uvalue->value.iec958.status[3];
682
683 spdif_write_channel_status(spdif_priv);
684
685 return 0;
686 }
687
688 /* Get channel status from SPDIF_RX_CCHAN register */
689 static int fsl_spdif_capture_get(struct snd_kcontrol *kcontrol,
690 struct snd_ctl_elem_value *ucontrol)
691 {
692 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
693 struct fsl_spdif_priv *spdif_priv = snd_soc_dai_get_drvdata(cpu_dai);
694 struct regmap *regmap = spdif_priv->regmap;
695 u32 cstatus, val;
696
697 regmap_read(regmap, REG_SPDIF_SIS, &val);
698 if (!(val & INT_CNEW))
699 return -EAGAIN;
700
701 regmap_read(regmap, REG_SPDIF_SRCSH, &cstatus);
702 ucontrol->value.iec958.status[0] = (cstatus >> 16) & 0xFF;
703 ucontrol->value.iec958.status[1] = (cstatus >> 8) & 0xFF;
704 ucontrol->value.iec958.status[2] = cstatus & 0xFF;
705
706 regmap_read(regmap, REG_SPDIF_SRCSL, &cstatus);
707 ucontrol->value.iec958.status[3] = (cstatus >> 16) & 0xFF;
708 ucontrol->value.iec958.status[4] = (cstatus >> 8) & 0xFF;
709 ucontrol->value.iec958.status[5] = cstatus & 0xFF;
710
711 /* Clear intr */
712 regmap_write(regmap, REG_SPDIF_SIC, INT_CNEW);
713
714 return 0;
715 }
716
717 /*
718 * Get User bits (subcode) from chip value which readed out
719 * in UChannel register.
720 */
721 static int fsl_spdif_subcode_get(struct snd_kcontrol *kcontrol,
722 struct snd_ctl_elem_value *ucontrol)
723 {
724 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
725 struct fsl_spdif_priv *spdif_priv = snd_soc_dai_get_drvdata(cpu_dai);
726 struct spdif_mixer_control *ctrl = &spdif_priv->fsl_spdif_control;
727 unsigned long flags;
728 int ret = -EAGAIN;
729
730 spin_lock_irqsave(&ctrl->ctl_lock, flags);
731 if (ctrl->ready_buf) {
732 int idx = (ctrl->ready_buf - 1) * SPDIF_UBITS_SIZE;
733 memcpy(&ucontrol->value.iec958.subcode[0],
734 &ctrl->subcode[idx], SPDIF_UBITS_SIZE);
735 ret = 0;
736 }
737 spin_unlock_irqrestore(&ctrl->ctl_lock, flags);
738
739 return ret;
740 }
741
742 /* Q-subcode information. The byte size is SPDIF_UBITS_SIZE/8 */
743 static int fsl_spdif_qinfo(struct snd_kcontrol *kcontrol,
744 struct snd_ctl_elem_info *uinfo)
745 {
746 uinfo->type = SNDRV_CTL_ELEM_TYPE_BYTES;
747 uinfo->count = SPDIF_QSUB_SIZE;
748
749 return 0;
750 }
751
752 /* Get Q subcode from chip value which readed out in QChannel register */
753 static int fsl_spdif_qget(struct snd_kcontrol *kcontrol,
754 struct snd_ctl_elem_value *ucontrol)
755 {
756 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
757 struct fsl_spdif_priv *spdif_priv = snd_soc_dai_get_drvdata(cpu_dai);
758 struct spdif_mixer_control *ctrl = &spdif_priv->fsl_spdif_control;
759 unsigned long flags;
760 int ret = -EAGAIN;
761
762 spin_lock_irqsave(&ctrl->ctl_lock, flags);
763 if (ctrl->ready_buf) {
764 int idx = (ctrl->ready_buf - 1) * SPDIF_QSUB_SIZE;
765 memcpy(&ucontrol->value.bytes.data[0],
766 &ctrl->qsub[idx], SPDIF_QSUB_SIZE);
767 ret = 0;
768 }
769 spin_unlock_irqrestore(&ctrl->ctl_lock, flags);
770
771 return ret;
772 }
773
774 /* Valid bit information */
775 static int fsl_spdif_vbit_info(struct snd_kcontrol *kcontrol,
776 struct snd_ctl_elem_info *uinfo)
777 {
778 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
779 uinfo->count = 1;
780 uinfo->value.integer.min = 0;
781 uinfo->value.integer.max = 1;
782
783 return 0;
784 }
785
786 /* Get valid good bit from interrupt status register */
787 static int fsl_spdif_vbit_get(struct snd_kcontrol *kcontrol,
788 struct snd_ctl_elem_value *ucontrol)
789 {
790 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
791 struct fsl_spdif_priv *spdif_priv = snd_soc_dai_get_drvdata(cpu_dai);
792 struct regmap *regmap = spdif_priv->regmap;
793 u32 val;
794
795 regmap_read(regmap, REG_SPDIF_SIS, &val);
796 ucontrol->value.integer.value[0] = (val & INT_VAL_NOGOOD) != 0;
797 regmap_write(regmap, REG_SPDIF_SIC, INT_VAL_NOGOOD);
798
799 return 0;
800 }
801
802 /* DPLL lock information */
803 static int fsl_spdif_rxrate_info(struct snd_kcontrol *kcontrol,
804 struct snd_ctl_elem_info *uinfo)
805 {
806 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
807 uinfo->count = 1;
808 uinfo->value.integer.min = 16000;
809 uinfo->value.integer.max = 96000;
810
811 return 0;
812 }
813
814 static u32 gainsel_multi[GAINSEL_MULTI_MAX] = {
815 24, 16, 12, 8, 6, 4, 3,
816 };
817
818 /* Get RX data clock rate given the SPDIF bus_clk */
819 static int spdif_get_rxclk_rate(struct fsl_spdif_priv *spdif_priv,
820 enum spdif_gainsel gainsel)
821 {
822 struct regmap *regmap = spdif_priv->regmap;
823 struct platform_device *pdev = spdif_priv->pdev;
824 u64 tmpval64, busclk_freq = 0;
825 u32 freqmeas, phaseconf;
826 u8 clksrc;
827
828 regmap_read(regmap, REG_SPDIF_SRFM, &freqmeas);
829 regmap_read(regmap, REG_SPDIF_SRPC, &phaseconf);
830
831 clksrc = (phaseconf >> SRPC_CLKSRC_SEL_OFFSET) & 0xf;
832
833 /* Get bus clock from system */
834 if (srpc_dpll_locked[clksrc] && (phaseconf & SRPC_DPLL_LOCKED))
835 busclk_freq = clk_get_rate(spdif_priv->sysclk);
836
837 /* FreqMeas_CLK = (BUS_CLK * FreqMeas) / 2 ^ 10 / GAINSEL / 128 */
838 tmpval64 = (u64) busclk_freq * freqmeas;
839 do_div(tmpval64, gainsel_multi[gainsel] * 1024);
840 do_div(tmpval64, 128 * 1024);
841
842 dev_dbg(&pdev->dev, "FreqMeas: %d\n", freqmeas);
843 dev_dbg(&pdev->dev, "BusclkFreq: %lld\n", busclk_freq);
844 dev_dbg(&pdev->dev, "RxRate: %lld\n", tmpval64);
845
846 return (int)tmpval64;
847 }
848
849 /*
850 * Get DPLL lock or not info from stable interrupt status register.
851 * User application must use this control to get locked,
852 * then can do next PCM operation
853 */
854 static int fsl_spdif_rxrate_get(struct snd_kcontrol *kcontrol,
855 struct snd_ctl_elem_value *ucontrol)
856 {
857 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
858 struct fsl_spdif_priv *spdif_priv = snd_soc_dai_get_drvdata(cpu_dai);
859 int rate = 0;
860
861 if (spdif_priv->dpll_locked)
862 rate = spdif_get_rxclk_rate(spdif_priv, SPDIF_DEFAULT_GAINSEL);
863
864 ucontrol->value.integer.value[0] = rate;
865
866 return 0;
867 }
868
869 /* User bit sync mode info */
870 static int fsl_spdif_usync_info(struct snd_kcontrol *kcontrol,
871 struct snd_ctl_elem_info *uinfo)
872 {
873 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
874 uinfo->count = 1;
875 uinfo->value.integer.min = 0;
876 uinfo->value.integer.max = 1;
877
878 return 0;
879 }
880
881 /*
882 * User bit sync mode:
883 * 1 CD User channel subcode
884 * 0 Non-CD data
885 */
886 static int fsl_spdif_usync_get(struct snd_kcontrol *kcontrol,
887 struct snd_ctl_elem_value *ucontrol)
888 {
889 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
890 struct fsl_spdif_priv *spdif_priv = snd_soc_dai_get_drvdata(cpu_dai);
891 struct regmap *regmap = spdif_priv->regmap;
892 u32 val;
893
894 regmap_read(regmap, REG_SPDIF_SRCD, &val);
895 ucontrol->value.integer.value[0] = (val & SRCD_CD_USER) != 0;
896
897 return 0;
898 }
899
900 /*
901 * User bit sync mode:
902 * 1 CD User channel subcode
903 * 0 Non-CD data
904 */
905 static int fsl_spdif_usync_put(struct snd_kcontrol *kcontrol,
906 struct snd_ctl_elem_value *ucontrol)
907 {
908 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
909 struct fsl_spdif_priv *spdif_priv = snd_soc_dai_get_drvdata(cpu_dai);
910 struct regmap *regmap = spdif_priv->regmap;
911 u32 val = ucontrol->value.integer.value[0] << SRCD_CD_USER_OFFSET;
912
913 regmap_update_bits(regmap, REG_SPDIF_SRCD, SRCD_CD_USER, val);
914
915 return 0;
916 }
917
918 /* FSL SPDIF IEC958 controller defines */
919 static struct snd_kcontrol_new fsl_spdif_ctrls[] = {
920 /* Status cchanel controller */
921 {
922 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
923 .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT),
924 .access = SNDRV_CTL_ELEM_ACCESS_READ |
925 SNDRV_CTL_ELEM_ACCESS_WRITE |
926 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
927 .info = fsl_spdif_info,
928 .get = fsl_spdif_pb_get,
929 .put = fsl_spdif_pb_put,
930 },
931 {
932 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
933 .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT),
934 .access = SNDRV_CTL_ELEM_ACCESS_READ |
935 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
936 .info = fsl_spdif_info,
937 .get = fsl_spdif_capture_get,
938 },
939 /* User bits controller */
940 {
941 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
942 .name = "IEC958 Subcode Capture Default",
943 .access = SNDRV_CTL_ELEM_ACCESS_READ |
944 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
945 .info = fsl_spdif_info,
946 .get = fsl_spdif_subcode_get,
947 },
948 {
949 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
950 .name = "IEC958 Q-subcode Capture Default",
951 .access = SNDRV_CTL_ELEM_ACCESS_READ |
952 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
953 .info = fsl_spdif_qinfo,
954 .get = fsl_spdif_qget,
955 },
956 /* Valid bit error controller */
957 {
958 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
959 .name = "IEC958 V-Bit Errors",
960 .access = SNDRV_CTL_ELEM_ACCESS_READ |
961 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
962 .info = fsl_spdif_vbit_info,
963 .get = fsl_spdif_vbit_get,
964 },
965 /* DPLL lock info get controller */
966 {
967 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
968 .name = "RX Sample Rate",
969 .access = SNDRV_CTL_ELEM_ACCESS_READ |
970 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
971 .info = fsl_spdif_rxrate_info,
972 .get = fsl_spdif_rxrate_get,
973 },
974 /* User bit sync mode set/get controller */
975 {
976 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
977 .name = "IEC958 USyncMode CDText",
978 .access = SNDRV_CTL_ELEM_ACCESS_READ |
979 SNDRV_CTL_ELEM_ACCESS_WRITE |
980 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
981 .info = fsl_spdif_usync_info,
982 .get = fsl_spdif_usync_get,
983 .put = fsl_spdif_usync_put,
984 },
985 };
986
987 static int fsl_spdif_dai_probe(struct snd_soc_dai *dai)
988 {
989 struct fsl_spdif_priv *spdif_private = snd_soc_dai_get_drvdata(dai);
990
991 snd_soc_dai_init_dma_data(dai, &spdif_private->dma_params_tx,
992 &spdif_private->dma_params_rx);
993
994 snd_soc_add_dai_controls(dai, fsl_spdif_ctrls, ARRAY_SIZE(fsl_spdif_ctrls));
995
996 return 0;
997 }
998
999 static struct snd_soc_dai_driver fsl_spdif_dai = {
1000 .probe = &fsl_spdif_dai_probe,
1001 .playback = {
1002 .stream_name = "CPU-Playback",
1003 .channels_min = 2,
1004 .channels_max = 2,
1005 .rates = FSL_SPDIF_RATES_PLAYBACK,
1006 .formats = FSL_SPDIF_FORMATS_PLAYBACK,
1007 },
1008 .capture = {
1009 .stream_name = "CPU-Capture",
1010 .channels_min = 2,
1011 .channels_max = 2,
1012 .rates = FSL_SPDIF_RATES_CAPTURE,
1013 .formats = FSL_SPDIF_FORMATS_CAPTURE,
1014 },
1015 .ops = &fsl_spdif_dai_ops,
1016 };
1017
1018 static const struct snd_soc_component_driver fsl_spdif_component = {
1019 .name = "fsl-spdif",
1020 };
1021
1022 /* FSL SPDIF REGMAP */
1023 static const struct reg_default fsl_spdif_reg_defaults[] = {
1024 {REG_SPDIF_SCR, 0x00000400},
1025 {REG_SPDIF_SRCD, 0x00000000},
1026 {REG_SPDIF_SIE, 0x00000000},
1027 {REG_SPDIF_STL, 0x00000000},
1028 {REG_SPDIF_STR, 0x00000000},
1029 {REG_SPDIF_STCSCH, 0x00000000},
1030 {REG_SPDIF_STCSCL, 0x00000000},
1031 {REG_SPDIF_STC, 0x00020f00},
1032 };
1033
1034 static bool fsl_spdif_readable_reg(struct device *dev, unsigned int reg)
1035 {
1036 switch (reg) {
1037 case REG_SPDIF_SCR:
1038 case REG_SPDIF_SRCD:
1039 case REG_SPDIF_SRPC:
1040 case REG_SPDIF_SIE:
1041 case REG_SPDIF_SIS:
1042 case REG_SPDIF_SRL:
1043 case REG_SPDIF_SRR:
1044 case REG_SPDIF_SRCSH:
1045 case REG_SPDIF_SRCSL:
1046 case REG_SPDIF_SRU:
1047 case REG_SPDIF_SRQ:
1048 case REG_SPDIF_STCSCH:
1049 case REG_SPDIF_STCSCL:
1050 case REG_SPDIF_SRFM:
1051 case REG_SPDIF_STC:
1052 return true;
1053 default:
1054 return false;
1055 }
1056 }
1057
1058 static bool fsl_spdif_volatile_reg(struct device *dev, unsigned int reg)
1059 {
1060 switch (reg) {
1061 case REG_SPDIF_SRPC:
1062 case REG_SPDIF_SIS:
1063 case REG_SPDIF_SRL:
1064 case REG_SPDIF_SRR:
1065 case REG_SPDIF_SRCSH:
1066 case REG_SPDIF_SRCSL:
1067 case REG_SPDIF_SRU:
1068 case REG_SPDIF_SRQ:
1069 case REG_SPDIF_SRFM:
1070 return true;
1071 default:
1072 return false;
1073 }
1074 }
1075
1076 static bool fsl_spdif_writeable_reg(struct device *dev, unsigned int reg)
1077 {
1078 switch (reg) {
1079 case REG_SPDIF_SCR:
1080 case REG_SPDIF_SRCD:
1081 case REG_SPDIF_SRPC:
1082 case REG_SPDIF_SIE:
1083 case REG_SPDIF_SIC:
1084 case REG_SPDIF_STL:
1085 case REG_SPDIF_STR:
1086 case REG_SPDIF_STCSCH:
1087 case REG_SPDIF_STCSCL:
1088 case REG_SPDIF_STC:
1089 return true;
1090 default:
1091 return false;
1092 }
1093 }
1094
1095 static const struct regmap_config fsl_spdif_regmap_config = {
1096 .reg_bits = 32,
1097 .reg_stride = 4,
1098 .val_bits = 32,
1099
1100 .max_register = REG_SPDIF_STC,
1101 .reg_defaults = fsl_spdif_reg_defaults,
1102 .num_reg_defaults = ARRAY_SIZE(fsl_spdif_reg_defaults),
1103 .readable_reg = fsl_spdif_readable_reg,
1104 .volatile_reg = fsl_spdif_volatile_reg,
1105 .writeable_reg = fsl_spdif_writeable_reg,
1106 .cache_type = REGCACHE_FLAT,
1107 };
1108
1109 static u32 fsl_spdif_txclk_caldiv(struct fsl_spdif_priv *spdif_priv,
1110 struct clk *clk, u64 savesub,
1111 enum spdif_txrate index, bool round)
1112 {
1113 static const u32 rate[] = { 32000, 44100, 48000, 96000, 192000 };
1114 bool is_sysclk = clk_is_match(clk, spdif_priv->sysclk);
1115 u64 rate_ideal, rate_actual, sub;
1116 u32 sysclk_dfmin, sysclk_dfmax;
1117 u32 txclk_df, sysclk_df, arate;
1118
1119 /* The sysclk has an extra divisor [2, 512] */
1120 sysclk_dfmin = is_sysclk ? 2 : 1;
1121 sysclk_dfmax = is_sysclk ? 512 : 1;
1122
1123 for (sysclk_df = sysclk_dfmin; sysclk_df <= sysclk_dfmax; sysclk_df++) {
1124 for (txclk_df = 1; txclk_df <= 128; txclk_df++) {
1125 rate_ideal = rate[index] * txclk_df * 64;
1126 if (round)
1127 rate_actual = clk_round_rate(clk, rate_ideal);
1128 else
1129 rate_actual = clk_get_rate(clk);
1130
1131 arate = rate_actual / 64;
1132 arate /= txclk_df * sysclk_df;
1133
1134 if (arate == rate[index]) {
1135 /* We are lucky */
1136 savesub = 0;
1137 spdif_priv->txclk_df[index] = txclk_df;
1138 spdif_priv->sysclk_df[index] = sysclk_df;
1139 spdif_priv->txrate[index] = arate;
1140 goto out;
1141 } else if (arate / rate[index] == 1) {
1142 /* A little bigger than expect */
1143 sub = (u64)(arate - rate[index]) * 100000;
1144 do_div(sub, rate[index]);
1145 if (sub >= savesub)
1146 continue;
1147 savesub = sub;
1148 spdif_priv->txclk_df[index] = txclk_df;
1149 spdif_priv->sysclk_df[index] = sysclk_df;
1150 spdif_priv->txrate[index] = arate;
1151 } else if (rate[index] / arate == 1) {
1152 /* A little smaller than expect */
1153 sub = (u64)(rate[index] - arate) * 100000;
1154 do_div(sub, rate[index]);
1155 if (sub >= savesub)
1156 continue;
1157 savesub = sub;
1158 spdif_priv->txclk_df[index] = txclk_df;
1159 spdif_priv->sysclk_df[index] = sysclk_df;
1160 spdif_priv->txrate[index] = arate;
1161 }
1162 }
1163 }
1164
1165 out:
1166 return savesub;
1167 }
1168
1169 static int fsl_spdif_probe_txclk(struct fsl_spdif_priv *spdif_priv,
1170 enum spdif_txrate index)
1171 {
1172 static const u32 rate[] = { 32000, 44100, 48000, 96000, 192000 };
1173 struct platform_device *pdev = spdif_priv->pdev;
1174 struct device *dev = &pdev->dev;
1175 u64 savesub = 100000, ret;
1176 struct clk *clk;
1177 char tmp[16];
1178 int i;
1179
1180 for (i = 0; i < STC_TXCLK_SRC_MAX; i++) {
1181 sprintf(tmp, "rxtx%d", i);
1182 clk = devm_clk_get(&pdev->dev, tmp);
1183 if (IS_ERR(clk)) {
1184 dev_err(dev, "no rxtx%d clock in devicetree\n", i);
1185 return PTR_ERR(clk);
1186 }
1187 if (!clk_get_rate(clk))
1188 continue;
1189
1190 ret = fsl_spdif_txclk_caldiv(spdif_priv, clk, savesub, index,
1191 i == STC_TXCLK_SPDIF_ROOT);
1192 if (savesub == ret)
1193 continue;
1194
1195 savesub = ret;
1196 spdif_priv->txclk[index] = clk;
1197 spdif_priv->txclk_src[index] = i;
1198
1199 /* To quick catch a divisor, we allow a 0.1% deviation */
1200 if (savesub < 100)
1201 break;
1202 }
1203
1204 dev_dbg(&pdev->dev, "use rxtx%d as tx clock source for %dHz sample rate\n",
1205 spdif_priv->txclk_src[index], rate[index]);
1206 dev_dbg(&pdev->dev, "use txclk df %d for %dHz sample rate\n",
1207 spdif_priv->txclk_df[index], rate[index]);
1208 if (clk_is_match(spdif_priv->txclk[index], spdif_priv->sysclk))
1209 dev_dbg(&pdev->dev, "use sysclk df %d for %dHz sample rate\n",
1210 spdif_priv->sysclk_df[index], rate[index]);
1211 dev_dbg(&pdev->dev, "the best rate for %dHz sample rate is %dHz\n",
1212 rate[index], spdif_priv->txrate[index]);
1213
1214 return 0;
1215 }
1216
1217 static int fsl_spdif_probe(struct platform_device *pdev)
1218 {
1219 struct device_node *np = pdev->dev.of_node;
1220 struct fsl_spdif_priv *spdif_priv;
1221 struct spdif_mixer_control *ctrl;
1222 struct resource *res;
1223 void __iomem *regs;
1224 int irq, ret, i;
1225
1226 if (!np)
1227 return -ENODEV;
1228
1229 spdif_priv = devm_kzalloc(&pdev->dev, sizeof(*spdif_priv), GFP_KERNEL);
1230 if (!spdif_priv)
1231 return -ENOMEM;
1232
1233 spdif_priv->pdev = pdev;
1234
1235 /* Initialize this copy of the CPU DAI driver structure */
1236 memcpy(&spdif_priv->cpu_dai_drv, &fsl_spdif_dai, sizeof(fsl_spdif_dai));
1237 spdif_priv->cpu_dai_drv.name = dev_name(&pdev->dev);
1238
1239 /* Get the addresses and IRQ */
1240 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1241 regs = devm_ioremap_resource(&pdev->dev, res);
1242 if (IS_ERR(regs))
1243 return PTR_ERR(regs);
1244
1245 spdif_priv->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
1246 "core", regs, &fsl_spdif_regmap_config);
1247 if (IS_ERR(spdif_priv->regmap)) {
1248 dev_err(&pdev->dev, "regmap init failed\n");
1249 return PTR_ERR(spdif_priv->regmap);
1250 }
1251
1252 irq = platform_get_irq(pdev, 0);
1253 if (irq < 0) {
1254 dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
1255 return irq;
1256 }
1257
1258 ret = devm_request_irq(&pdev->dev, irq, spdif_isr, 0,
1259 dev_name(&pdev->dev), spdif_priv);
1260 if (ret) {
1261 dev_err(&pdev->dev, "could not claim irq %u\n", irq);
1262 return ret;
1263 }
1264
1265 /* Get system clock for rx clock rate calculation */
1266 spdif_priv->sysclk = devm_clk_get(&pdev->dev, "rxtx5");
1267 if (IS_ERR(spdif_priv->sysclk)) {
1268 dev_err(&pdev->dev, "no sys clock (rxtx5) in devicetree\n");
1269 return PTR_ERR(spdif_priv->sysclk);
1270 }
1271
1272 /* Get core clock for data register access via DMA */
1273 spdif_priv->coreclk = devm_clk_get(&pdev->dev, "core");
1274 if (IS_ERR(spdif_priv->coreclk)) {
1275 dev_err(&pdev->dev, "no core clock in devicetree\n");
1276 return PTR_ERR(spdif_priv->coreclk);
1277 }
1278
1279 spdif_priv->spbaclk = devm_clk_get(&pdev->dev, "spba");
1280 if (IS_ERR(spdif_priv->spbaclk))
1281 dev_warn(&pdev->dev, "no spba clock in devicetree\n");
1282
1283 /* Select clock source for rx/tx clock */
1284 spdif_priv->rxclk = devm_clk_get(&pdev->dev, "rxtx1");
1285 if (IS_ERR(spdif_priv->rxclk)) {
1286 dev_err(&pdev->dev, "no rxtx1 clock in devicetree\n");
1287 return PTR_ERR(spdif_priv->rxclk);
1288 }
1289 spdif_priv->rxclk_src = DEFAULT_RXCLK_SRC;
1290
1291 for (i = 0; i < SPDIF_TXRATE_MAX; i++) {
1292 ret = fsl_spdif_probe_txclk(spdif_priv, i);
1293 if (ret)
1294 return ret;
1295 }
1296
1297 /* Initial spinlock for control data */
1298 ctrl = &spdif_priv->fsl_spdif_control;
1299 spin_lock_init(&ctrl->ctl_lock);
1300
1301 /* Init tx channel status default value */
1302 ctrl->ch_status[0] = IEC958_AES0_CON_NOT_COPYRIGHT |
1303 IEC958_AES0_CON_EMPHASIS_5015;
1304 ctrl->ch_status[1] = IEC958_AES1_CON_DIGDIGCONV_ID;
1305 ctrl->ch_status[2] = 0x00;
1306 ctrl->ch_status[3] = IEC958_AES3_CON_FS_44100 |
1307 IEC958_AES3_CON_CLOCK_1000PPM;
1308
1309 spdif_priv->dpll_locked = false;
1310
1311 spdif_priv->dma_params_tx.maxburst = FSL_SPDIF_TXFIFO_WML;
1312 spdif_priv->dma_params_rx.maxburst = FSL_SPDIF_RXFIFO_WML;
1313 spdif_priv->dma_params_tx.addr = res->start + REG_SPDIF_STL;
1314 spdif_priv->dma_params_rx.addr = res->start + REG_SPDIF_SRL;
1315
1316 /* Register with ASoC */
1317 dev_set_drvdata(&pdev->dev, spdif_priv);
1318
1319 ret = devm_snd_soc_register_component(&pdev->dev, &fsl_spdif_component,
1320 &spdif_priv->cpu_dai_drv, 1);
1321 if (ret) {
1322 dev_err(&pdev->dev, "failed to register DAI: %d\n", ret);
1323 return ret;
1324 }
1325
1326 ret = imx_pcm_dma_init(pdev, IMX_SPDIF_DMABUF_SIZE);
1327 if (ret)
1328 dev_err(&pdev->dev, "imx_pcm_dma_init failed: %d\n", ret);
1329
1330 return ret;
1331 }
1332
1333 #ifdef CONFIG_PM_SLEEP
1334 static int fsl_spdif_suspend(struct device *dev)
1335 {
1336 struct fsl_spdif_priv *spdif_priv = dev_get_drvdata(dev);
1337
1338 regmap_read(spdif_priv->regmap, REG_SPDIF_SRPC,
1339 &spdif_priv->regcache_srpc);
1340
1341 regcache_cache_only(spdif_priv->regmap, true);
1342 regcache_mark_dirty(spdif_priv->regmap);
1343
1344 return 0;
1345 }
1346
1347 static int fsl_spdif_resume(struct device *dev)
1348 {
1349 struct fsl_spdif_priv *spdif_priv = dev_get_drvdata(dev);
1350
1351 regcache_cache_only(spdif_priv->regmap, false);
1352
1353 regmap_update_bits(spdif_priv->regmap, REG_SPDIF_SRPC,
1354 SRPC_CLKSRC_SEL_MASK | SRPC_GAINSEL_MASK,
1355 spdif_priv->regcache_srpc);
1356
1357 return regcache_sync(spdif_priv->regmap);
1358 }
1359 #endif /* CONFIG_PM_SLEEP */
1360
1361 static const struct dev_pm_ops fsl_spdif_pm = {
1362 SET_SYSTEM_SLEEP_PM_OPS(fsl_spdif_suspend, fsl_spdif_resume)
1363 };
1364
1365 static const struct of_device_id fsl_spdif_dt_ids[] = {
1366 { .compatible = "fsl,imx35-spdif", },
1367 { .compatible = "fsl,vf610-spdif", },
1368 {}
1369 };
1370 MODULE_DEVICE_TABLE(of, fsl_spdif_dt_ids);
1371
1372 static struct platform_driver fsl_spdif_driver = {
1373 .driver = {
1374 .name = "fsl-spdif-dai",
1375 .of_match_table = fsl_spdif_dt_ids,
1376 .pm = &fsl_spdif_pm,
1377 },
1378 .probe = fsl_spdif_probe,
1379 };
1380
1381 module_platform_driver(fsl_spdif_driver);
1382
1383 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
1384 MODULE_DESCRIPTION("Freescale S/PDIF CPU DAI Driver");
1385 MODULE_LICENSE("GPL v2");
1386 MODULE_ALIAS("platform:fsl-spdif-dai");
Linux with added FPC-III support