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-rw-r--r--sound/soc/at91/at91-i2s.c618
-rw-r--r--sound/soc/at91/at91-i2s.h27
2 files changed, 356 insertions, 289 deletions
diff --git a/sound/soc/at91/at91-i2s.c b/sound/soc/at91/at91-i2s.c
index 876d391c7013..fcc544a96ba3 100644
--- a/sound/soc/at91/at91-i2s.c
+++ b/sound/soc/at91/at91-i2s.c
@@ -12,8 +12,6 @@
12 * Free Software Foundation; either version 2 of the License, or (at your 12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version. 13 * option) any later version.
14 * 14 *
15 * Revision history
16 * 3rd Mar 2006 Initial version.
17 */ 15 */
18 16
19#include <linux/init.h> 17#include <linux/init.h>
@@ -34,6 +32,7 @@
34#include <asm/arch/at91_pdc.h> 32#include <asm/arch/at91_pdc.h>
35 33
36#include "at91-pcm.h" 34#include "at91-pcm.h"
35#include "at91-i2s.h"
37 36
38#if 0 37#if 0
39#define DBG(x...) printk(KERN_DEBUG "at91-i2s:" x) 38#define DBG(x...) printk(KERN_DEBUG "at91-i2s:" x)
@@ -48,65 +47,6 @@
48#endif 47#endif
49 48
50 49
51#define AT91_I2S_DAIFMT \
52 (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS | SND_SOC_DAIFMT_NB_NF)
53
54#define AT91_I2S_DIR \
55 (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
56
57/* priv is (SSC_CMR.DIV << 16 | SSC_TCMR.PERIOD ) */
58static struct snd_soc_dai_mode at91_i2s[] = {
59
60 /* 8k: BCLK = (MCLK/10) = (60MHz/50) = 1.2MHz */
61 {
62 .fmt = AT91_I2S_DAIFMT,
63 .pcmfmt = SNDRV_PCM_FMTBIT_S16_LE,
64 .pcmrate = SNDRV_PCM_RATE_8000,
65 .pcmdir = AT91_I2S_DIR,
66 .flags = SND_SOC_DAI_BFS_DIV,
67 .fs = 1500,
68 .bfs = SND_SOC_FSBD(10),
69 .priv = (25 << 16 | 74),
70 },
71
72 /* 16k: BCLK = (MCLK/3) ~= (60MHz/14) = 4.285714MHz */
73 {
74 .fmt = AT91_I2S_DAIFMT,
75 .pcmfmt = SNDRV_PCM_FMTBIT_S16_LE,
76 .pcmrate = SNDRV_PCM_RATE_16000,
77 .pcmdir = AT91_I2S_DIR,
78 .flags = SND_SOC_DAI_BFS_DIV,
79 .fs = 750,
80 .bfs = SND_SOC_FSBD(3),
81 .priv = (7 << 16 | 133),
82 },
83
84 /* 32k: BCLK = (MCLK/3) ~= (60MHz/14) = 4.285714MHz */
85 {
86 .fmt = AT91_I2S_DAIFMT,
87 .pcmfmt = SNDRV_PCM_FMTBIT_S16_LE,
88 .pcmrate = SNDRV_PCM_RATE_32000,
89 .pcmdir = AT91_I2S_DIR,
90 .flags = SND_SOC_DAI_BFS_DIV,
91 .fs = 375,
92 .bfs = SND_SOC_FSBD(3),
93 .priv = (7 << 16 | 66),
94 },
95
96 /* 48k: BCLK = (MCLK/5) ~= (60MHz/26) = 2.3076923MHz */
97 {
98 .fmt = AT91_I2S_DAIFMT,
99 .pcmfmt = SNDRV_PCM_FMTBIT_S16_LE,
100 .pcmrate = SNDRV_PCM_RATE_48000,
101 .pcmdir = AT91_I2S_DIR,
102 .flags = SND_SOC_DAI_BFS_DIV,
103 .fs = 250,
104 .bfs = SND_SOC_FSBD(5),
105 .priv = (13 << 16 | 23),
106 },
107};
108
109
110/* 50/*
111 * SSC PDC registers required by the PCM DMA engine. 51 * SSC PDC registers required by the PCM DMA engine.
112 */ 52 */
@@ -184,21 +124,6 @@ static struct at91_pcm_dma_params ssc_dma_params[NUM_SSC_DEVICES][2] = {
184#endif 124#endif
185}; 125};
186 126
187
188/*
189 * A MUTEX is used to protect an SSC initialzed flag which allows
190 * the substream hw_params() call to initialize the SSC only if
191 * there are no other substreams open. If there are other
192 * substreams open, the hw_param() call can only check that
193 * it is using the same format and rate.
194 */
195static DECLARE_MUTEX(ssc0_mutex);
196#if NUM_SSC_DEVICES == 3
197static DECLARE_MUTEX(ssc1_mutex);
198static DECLARE_MUTEX(ssc2_mutex);
199#endif
200
201
202struct at91_ssc_state { 127struct at91_ssc_state {
203 u32 ssc_cmr; 128 u32 ssc_cmr;
204 u32 ssc_rcmr; 129 u32 ssc_rcmr;
@@ -209,16 +134,16 @@ struct at91_ssc_state {
209 u32 ssc_imr; 134 u32 ssc_imr;
210}; 135};
211 136
212
213static struct at91_ssc_info { 137static struct at91_ssc_info {
214 char *name; 138 char *name;
215 struct at91_ssc_periph ssc; 139 struct at91_ssc_periph ssc;
216 spinlock_t lock; /* lock for dir_mask */ 140 spinlock_t lock; /* lock for dir_mask */
217 int dir_mask; /* 0=unused, 1=playback, 2=capture */ 141 unsigned short dir_mask; /* 0=unused, 1=playback, 2=capture */
218 struct semaphore *mutex; 142 unsigned short initialized; /* 1=SSC has been initialized */
219 int initialized; 143 unsigned short daifmt;
220 int pcmfmt; 144 unsigned short cmr_div;
221 int rate; 145 unsigned short tcmr_period;
146 unsigned short rcmr_period;
222 struct at91_pcm_dma_params *dma_params[2]; 147 struct at91_pcm_dma_params *dma_params[2];
223 struct at91_ssc_state ssc_state; 148 struct at91_ssc_state ssc_state;
224 149
@@ -227,7 +152,6 @@ static struct at91_ssc_info {
227 .name = "ssc0", 152 .name = "ssc0",
228 .lock = SPIN_LOCK_UNLOCKED, 153 .lock = SPIN_LOCK_UNLOCKED,
229 .dir_mask = 0, 154 .dir_mask = 0,
230 .mutex = &ssc0_mutex,
231 .initialized = 0, 155 .initialized = 0,
232 }, 156 },
233#if NUM_SSC_DEVICES == 3 157#if NUM_SSC_DEVICES == 3
@@ -235,20 +159,23 @@ static struct at91_ssc_info {
235 .name = "ssc1", 159 .name = "ssc1",
236 .lock = SPIN_LOCK_UNLOCKED, 160 .lock = SPIN_LOCK_UNLOCKED,
237 .dir_mask = 0, 161 .dir_mask = 0,
238 .mutex = &ssc1_mutex,
239 .initialized = 0, 162 .initialized = 0,
240 }, 163 },
241 { 164 {
242 .name = "ssc2", 165 .name = "ssc2",
243 .lock = SPIN_LOCK_UNLOCKED, 166 .lock = SPIN_LOCK_UNLOCKED,
244 .dir_mask = 0, 167 .dir_mask = 0,
245 .mutex = &ssc2_mutex,
246 .initialized = 0, 168 .initialized = 0,
247 }, 169 },
248#endif 170#endif
249}; 171};
250 172
173static unsigned int at91_i2s_sysclk;
251 174
175/*
176 * SSC interrupt handler. Passes PDC interrupts to the DMA
177 * interrupt handler in the PCM driver.
178 */
252static irqreturn_t at91_i2s_interrupt(int irq, void *dev_id) 179static irqreturn_t at91_i2s_interrupt(int irq, void *dev_id)
253{ 180{
254 struct at91_ssc_info *ssc_p = dev_id; 181 struct at91_ssc_info *ssc_p = dev_id;
@@ -278,10 +205,13 @@ static irqreturn_t at91_i2s_interrupt(int irq, void *dev_id)
278 return IRQ_HANDLED; 205 return IRQ_HANDLED;
279} 206}
280 207
208/*
209 * Startup. Only that one substream allowed in each direction.
210 */
281static int at91_i2s_startup(struct snd_pcm_substream *substream) 211static int at91_i2s_startup(struct snd_pcm_substream *substream)
282{ 212{
283 struct snd_soc_pcm_runtime *rtd = substream->private_data; 213 struct snd_soc_pcm_runtime *rtd = substream->private_data;
284 struct at91_ssc_info *ssc_p = &ssc_info[rtd->cpu_dai->id]; 214 struct at91_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id];
285 int dir_mask; 215 int dir_mask;
286 216
287 DBG("i2s_startup: SSC_SR=0x%08lx\n", 217 DBG("i2s_startup: SSC_SR=0x%08lx\n",
@@ -296,24 +226,22 @@ static int at91_i2s_startup(struct snd_pcm_substream *substream)
296 ssc_p->dir_mask |= dir_mask; 226 ssc_p->dir_mask |= dir_mask;
297 spin_unlock_irq(&ssc_p->lock); 227 spin_unlock_irq(&ssc_p->lock);
298 228
299 /*
300 * dma_data is not set until hw_params() is called and
301 * shutdown() depends on this value being NULL if hw_params()
302 * was not called.
303 */
304 rtd->cpu_dai->dma_data = NULL;
305
306 return 0; 229 return 0;
307} 230}
308 231
232/*
233 * Shutdown. Clear DMA parameters and shutdown the SSC if there
234 * are no other substreams open.
235 */
309static void at91_i2s_shutdown(struct snd_pcm_substream *substream) 236static void at91_i2s_shutdown(struct snd_pcm_substream *substream)
310{ 237{
311 struct snd_soc_pcm_runtime *rtd = substream->private_data; 238 struct snd_soc_pcm_runtime *rtd = substream->private_data;
312 struct at91_ssc_info *ssc_p = &ssc_info[rtd->cpu_dai->id]; 239 struct at91_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id];
313 struct at91_pcm_dma_params *dma_params = rtd->cpu_dai->dma_data; 240 struct at91_pcm_dma_params *dma_params;
314 int dir, dir_mask; 241 int dir, dir_mask;
315 242
316 dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1; 243 dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1;
244 dma_params = ssc_p->dma_params[dir];
317 245
318 if (dma_params != NULL) { 246 if (dma_params != NULL) {
319 at91_ssc_write(dma_params->ssc_base + AT91_SSC_CR, 247 at91_ssc_write(dma_params->ssc_base + AT91_SSC_CR,
@@ -335,99 +263,107 @@ static void at91_i2s_shutdown(struct snd_pcm_substream *substream)
335 DBG("Stopping pid %d clock\n", ssc_p->ssc.pid); 263 DBG("Stopping pid %d clock\n", ssc_p->ssc.pid);
336 at91_sys_write(AT91_PMC_PCDR, 1<<ssc_p->ssc.pid); 264 at91_sys_write(AT91_PMC_PCDR, 1<<ssc_p->ssc.pid);
337 265
338 if (ssc_p->initialized) 266 if (ssc_p->initialized) {
339 free_irq(ssc_p->ssc.pid, ssc_p); 267 free_irq(ssc_p->ssc.pid, ssc_p);
268 ssc_p->initialized = 0;
269 }
340 270
341 /* Reset the SSC */ 271 /* Reset the SSC */
342 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CR, AT91_SSC_SWRST); 272 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CR, AT91_SSC_SWRST);
343 273
344 /* Force a re-init on the next hw_params() call. */ 274 /* Clear the SSC dividers */
345 ssc_p->initialized = 0; 275 ssc_p->cmr_div = ssc_p->tcmr_period = ssc_p->rcmr_period = 0;
346 } 276 }
347 spin_unlock_irq(&ssc_p->lock); 277 spin_unlock_irq(&ssc_p->lock);
348} 278}
349 279
350#ifdef CONFIG_PM 280/*
351static int at91_i2s_suspend(struct platform_device *pdev, 281 * Record the SSC system clock rate.
352 struct snd_soc_cpu_dai *dai) 282 */
283static int at91_i2s_set_dai_sysclk(struct snd_soc_cpu_dai *cpu_dai,
284 int clk_id, unsigned int freq, int dir)
353{ 285{
354 struct at91_ssc_info *ssc_p; 286 /*
355 287 * The only clock supplied to the SSC is the AT91 master clock,
356 if(!dai->active) 288 * which is only used if the SSC is generating BCLK and/or
357 return 0; 289 * LRC clocks.
358 290 */
359 ssc_p = &ssc_info[dai->id]; 291 switch (clk_id) {
360 292 case AT91_SYSCLK_MCK:
361 /* Save the status register before disabling transmit and receive. */ 293 at91_i2s_sysclk = freq;
362 ssc_p->ssc_state.ssc_sr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_SR); 294 break;
363 at91_ssc_write(ssc_p->ssc.base + 295 default:
364 AT91_SSC_CR, AT91_SSC_TXDIS | AT91_SSC_RXDIS); 296 return -EINVAL;
365 297 }
366 /* Save the current interrupt mask, then disable unmasked interrupts. */
367 ssc_p->ssc_state.ssc_imr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_IMR);
368 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_IDR, ssc_p->ssc_state.ssc_imr);
369
370 ssc_p->ssc_state.ssc_cmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_CMR);
371 ssc_p->ssc_state.ssc_rcmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_RCMR);
372 ssc_p->ssc_state.ssc_rfmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_RCMR);
373 ssc_p->ssc_state.ssc_tcmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_RCMR);
374 ssc_p->ssc_state.ssc_tfmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_RCMR);
375 298
376 return 0; 299 return 0;
377} 300}
378 301
379static int at91_i2s_resume(struct platform_device *pdev, 302/*
380 struct snd_soc_cpu_dai *dai) 303 * Record the DAI format for use in hw_params().
304 */
305static int at91_i2s_set_dai_fmt(struct snd_soc_cpu_dai *cpu_dai,
306 unsigned int fmt)
381{ 307{
382 struct at91_ssc_info *ssc_p; 308 struct at91_ssc_info *ssc_p = &ssc_info[cpu_dai->id];
383 u32 cr_mask;
384
385 if(!dai->active)
386 return 0;
387
388 ssc_p = &ssc_info[dai->id];
389 309
390 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RCMR, ssc_p->ssc_state.ssc_tfmr); 310 if ((fmt & SND_SOC_DAIFMT_FORMAT_MASK) != SND_SOC_DAIFMT_I2S)
391 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RCMR, ssc_p->ssc_state.ssc_tcmr); 311 return -EINVAL;
392 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RCMR, ssc_p->ssc_state.ssc_rfmr);
393 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RCMR, ssc_p->ssc_state.ssc_rcmr);
394 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CMR, ssc_p->ssc_state.ssc_cmr);
395
396 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_IER, ssc_p->ssc_state.ssc_imr);
397
398 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CR,
399 ((ssc_p->ssc_state.ssc_sr & AT91_SSC_RXENA) ? AT91_SSC_RXEN : 0) |
400 ((ssc_p->ssc_state.ssc_sr & AT91_SSC_TXENA) ? AT91_SSC_TXEN : 0));
401 312
313 ssc_p->daifmt = fmt;
402 return 0; 314 return 0;
403} 315}
404 316
405#else 317/*
406#define at91_i2s_suspend NULL 318 * Record SSC clock dividers for use in hw_params().
407#define at91_i2s_resume NULL 319 */
408#endif 320static int at91_i2s_set_dai_clkdiv(struct snd_soc_cpu_dai *cpu_dai,
409 321 int div_id, int div)
410static unsigned int at91_i2s_config_sysclk(
411 struct snd_soc_cpu_dai *iface, struct snd_soc_clock_info *info,
412 unsigned int clk)
413{ 322{
414 /* Currently, there is only support for USB (12Mhz) mode */ 323 struct at91_ssc_info *ssc_p = &ssc_info[cpu_dai->id];
415 if (clk != 12000000) 324
416 return 0; 325 switch (div_id) {
417 return 12000000; 326 case AT91SSC_CMR_DIV:
327 /*
328 * The same master clock divider is used for both
329 * transmit and receive, so if a value has already
330 * been set, it must match this value.
331 */
332 if (ssc_p->cmr_div == 0)
333 ssc_p->cmr_div = div;
334 else
335 if (div != ssc_p->cmr_div)
336 return -EBUSY;
337 break;
338
339 case AT91SSC_TCMR_PERIOD:
340 ssc_p->tcmr_period = div;
341 break;
342
343 case AT91SSC_RCMR_PERIOD:
344 ssc_p->rcmr_period = div;
345 break;
346
347 default:
348 return -EINVAL;
349 }
350
351 return 0;
418} 352}
419 353
354/*
355 * Configure the SSC.
356 */
420static int at91_i2s_hw_params(struct snd_pcm_substream *substream, 357static int at91_i2s_hw_params(struct snd_pcm_substream *substream,
421 struct snd_pcm_hw_params *params) 358 struct snd_pcm_hw_params *params)
422{ 359{
423 struct snd_soc_pcm_runtime *rtd = substream->private_data; 360 struct snd_soc_pcm_runtime *rtd = substream->private_data;
424 int id = rtd->cpu_dai->id; 361 int id = rtd->dai->cpu_dai->id;
425 struct at91_ssc_info *ssc_p = &ssc_info[id]; 362 struct at91_ssc_info *ssc_p = &ssc_info[id];
426 struct at91_pcm_dma_params *dma_params; 363 struct at91_pcm_dma_params *dma_params;
427 unsigned int pcmfmt, rate;
428 int dir, channels, bits; 364 int dir, channels, bits;
429 struct clk *mck_clk; 365 u32 tfmr, rfmr, tcmr, rcmr;
430 u32 div, period, tfmr, rfmr, tcmr, rcmr; 366 int start_event;
431 int ret; 367 int ret;
432 368
433 /* 369 /*
@@ -442,44 +378,134 @@ static int at91_i2s_hw_params(struct snd_pcm_substream *substream,
442 dma_params->substream = substream; 378 dma_params->substream = substream;
443 379
444 ssc_p->dma_params[dir] = dma_params; 380 ssc_p->dma_params[dir] = dma_params;
445 rtd->cpu_dai->dma_data = dma_params;
446 381
447 rate = params_rate(params); 382 /*
448 channels = params_channels(params); 383 * The cpu_dai->dma_data field is only used to communicate the
384 * appropriate DMA parameters to the pcm driver hw_params()
385 * function. It should not be used for other purposes
386 * as it is common to all substreams.
387 */
388 rtd->dai->cpu_dai->dma_data = dma_params;
449 389
450 pcmfmt = rtd->cpu_dai->dai_runtime.pcmfmt; 390 channels = params_channels(params);
451 switch (pcmfmt) {
452 case SNDRV_PCM_FMTBIT_S16_LE:
453 /* likely this is all we'll ever support, but ... */
454 bits = 16;
455 dma_params->pdc_xfer_size = 2;
456 break;
457 default:
458 printk(KERN_WARNING "at91-i2s: unsupported format %x\n",
459 pcmfmt);
460 return -EINVAL;
461 }
462 391
463 /* Don't allow both SSC substreams to initialize at the same time. */ 392 /*
464 down(ssc_p->mutex); 393 * The SSC only supports up to 16-bit samples in I2S format, due
394 * to the size of the Frame Mode Register FSLEN field. Also, I2S
395 * implies signed data.
396 */
397 bits = 16;
398 dma_params->pdc_xfer_size = 2;
465 399
466 /* 400 /*
467 * If this SSC is alreadly initialized, then this substream must use 401 * Compute SSC register settings.
468 * the same format and rate.
469 */ 402 */
470 if (ssc_p->initialized) { 403 switch (ssc_p->daifmt) {
471 if (pcmfmt != ssc_p->pcmfmt || rate != ssc_p->rate) { 404 case SND_SOC_DAIFMT_CBS_CFS:
472 printk(KERN_WARNING "at91-i2s: " 405 /*
473 "incompatible substream in other direction\n"); 406 * SSC provides BCLK and LRC clocks.
474 up(ssc_p->mutex); 407 *
475 return -EINVAL; 408 * The SSC transmit and receive clocks are generated from the
476 } 409 * MCK divider, and the BCLK signal is output on the SSC TK line.
477 } else { 410 */
411 rcmr = (( ssc_p->rcmr_period << 24) & AT91_SSC_PERIOD)
412 | (( 1 << 16) & AT91_SSC_STTDLY)
413 | (( AT91_SSC_START_FALLING_RF ) & AT91_SSC_START)
414 | (( AT91_SSC_CK_RISING ) & AT91_SSC_CKI)
415 | (( AT91_SSC_CKO_NONE ) & AT91_SSC_CKO)
416 | (( AT91_SSC_CKS_DIV ) & AT91_SSC_CKS);
417
418 rfmr = (( AT91_SSC_FSEDGE_POSITIVE ) & AT91_SSC_FSEDGE)
419 | (( AT91_SSC_FSOS_NEGATIVE ) & AT91_SSC_FSOS)
420 | (((bits - 1) << 16) & AT91_SSC_FSLEN)
421 | (((channels - 1) << 8) & AT91_SSC_DATNB)
422 | (( 1 << 7) & AT91_SSC_MSBF)
423 | (( 0 << 5) & AT91_SSC_LOOP)
424 | (((bits - 1) << 0) & AT91_SSC_DATALEN);
425
426 tcmr = (( ssc_p->tcmr_period << 24) & AT91_SSC_PERIOD)
427 | (( 1 << 16) & AT91_SSC_STTDLY)
428 | (( AT91_SSC_START_FALLING_RF ) & AT91_SSC_START)
429 | (( AT91_SSC_CKI_FALLING ) & AT91_SSC_CKI)
430 | (( AT91_SSC_CKO_CONTINUOUS ) & AT91_SSC_CKO)
431 | (( AT91_SSC_CKS_DIV ) & AT91_SSC_CKS);
432
433 tfmr = (( AT91_SSC_FSEDGE_POSITIVE ) & AT91_SSC_FSEDGE)
434 | (( 0 << 23) & AT91_SSC_FSDEN)
435 | (( AT91_SSC_FSOS_NEGATIVE ) & AT91_SSC_FSOS)
436 | (((bits - 1) << 16) & AT91_SSC_FSLEN)
437 | (((channels - 1) << 8) & AT91_SSC_DATNB)
438 | (( 1 << 7) & AT91_SSC_MSBF)
439 | (( 0 << 5) & AT91_SSC_DATDEF)
440 | (((bits - 1) << 0) & AT91_SSC_DATALEN);
441 break;
442
443 case SND_SOC_DAIFMT_CBM_CFM:
444
445 /*
446 * CODEC supplies BCLK and LRC clocks.
447 *
448 * The SSC transmit clock is obtained from the BCLK signal on
449 * on the TK line, and the SSC receive clock is generated from the
450 * transmit clock.
451 *
452 * For single channel data, one sample is transferred on the falling
453 * edge of the LRC clock. For two channel data, one sample is
454 * transferred on both edges of the LRC clock.
455 */
456 start_event = channels == 1
457 ? AT91_SSC_START_FALLING_RF
458 : AT91_SSC_START_EDGE_RF;
459
460 rcmr = (( 0 << 24) & AT91_SSC_PERIOD)
461 | (( 1 << 16) & AT91_SSC_STTDLY)
462 | (( start_event ) & AT91_SSC_START)
463 | (( AT91_SSC_CK_RISING ) & AT91_SSC_CKI)
464 | (( AT91_SSC_CKO_NONE ) & AT91_SSC_CKO)
465 | (( AT91_SSC_CKS_CLOCK ) & AT91_SSC_CKS);
466
467 rfmr = (( AT91_SSC_FSEDGE_POSITIVE ) & AT91_SSC_FSEDGE)
468 | (( AT91_SSC_FSOS_NONE ) & AT91_SSC_FSOS)
469 | (( 0 << 16) & AT91_SSC_FSLEN)
470 | (( 0 << 8) & AT91_SSC_DATNB)
471 | (( 1 << 7) & AT91_SSC_MSBF)
472 | (( 0 << 5) & AT91_SSC_LOOP)
473 | (((bits - 1) << 0) & AT91_SSC_DATALEN);
474
475 tcmr = (( 0 << 24) & AT91_SSC_PERIOD)
476 | (( 1 << 16) & AT91_SSC_STTDLY)
477 | (( start_event ) & AT91_SSC_START)
478 | (( AT91_SSC_CKI_FALLING ) & AT91_SSC_CKI)
479 | (( AT91_SSC_CKO_NONE ) & AT91_SSC_CKO)
480 | (( AT91_SSC_CKS_PIN ) & AT91_SSC_CKS);
481
482 tfmr = (( AT91_SSC_FSEDGE_POSITIVE ) & AT91_SSC_FSEDGE)
483 | (( 0 << 23) & AT91_SSC_FSDEN)
484 | (( AT91_SSC_FSOS_NONE ) & AT91_SSC_FSOS)
485 | (( 0 << 16) & AT91_SSC_FSLEN)
486 | (( 0 << 8) & AT91_SSC_DATNB)
487 | (( 1 << 7) & AT91_SSC_MSBF)
488 | (( 0 << 5) & AT91_SSC_DATDEF)
489 | (((bits - 1) << 0) & AT91_SSC_DATALEN);
490 break;
491
492 case SND_SOC_DAIFMT_CBS_CFM:
493 case SND_SOC_DAIFMT_CBM_CFS:
494 default:
495 printk(KERN_WARNING "at91-i2s: unsupported DAI format 0x%x.\n",
496 ssc_p->daifmt);
497 return -EINVAL;
498 break;
499 }
500 DBG("RCMR=%08x RFMR=%08x TCMR=%08x TFMR=%08x\n", rcmr, rfmr, tcmr, tfmr);
501
502 if (!ssc_p->initialized) {
503
478 /* Enable PMC peripheral clock for this SSC */ 504 /* Enable PMC peripheral clock for this SSC */
479 DBG("Starting pid %d clock\n", ssc_p->ssc.pid); 505 DBG("Starting pid %d clock\n", ssc_p->ssc.pid);
480 at91_sys_write(AT91_PMC_PCER, 1<<ssc_p->ssc.pid); 506 at91_sys_write(AT91_PMC_PCER, 1<<ssc_p->ssc.pid);
481 507
482 /* Reset the SSC */ 508 /* Reset the SSC and its PDC registers */
483 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CR, AT91_SSC_SWRST); 509 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CR, AT91_SSC_SWRST);
484 510
485 at91_ssc_write(ssc_p->ssc.base + AT91_PDC_RPR, 0); 511 at91_ssc_write(ssc_p->ssc.base + AT91_PDC_RPR, 0);
@@ -491,97 +517,30 @@ static int at91_i2s_hw_params(struct snd_pcm_substream *substream,
491 at91_ssc_write(ssc_p->ssc.base + AT91_PDC_TNPR, 0); 517 at91_ssc_write(ssc_p->ssc.base + AT91_PDC_TNPR, 0);
492 at91_ssc_write(ssc_p->ssc.base + AT91_PDC_TNCR, 0); 518 at91_ssc_write(ssc_p->ssc.base + AT91_PDC_TNCR, 0);
493 519
494 div = rtd->cpu_dai->dai_runtime.priv >> 16;
495 period = rtd->cpu_dai->dai_runtime.priv & 0xffff;
496
497 mck_clk = clk_get(NULL, "mck");
498
499 DBG("mck %lu fsbd %u bfs %llu bfs_real %u bclk %lu div %u period %u\n",
500 clk_get_rate(mck_clk),
501 SND_SOC_FSBD(6),
502 rtd->cpu_dai->dai_runtime.bfs,
503 SND_SOC_FSBD_REAL(rtd->cpu_dai->dai_runtime.bfs),
504 clk_get_rate(mck_clk) / (2 * div),
505 div,
506 period);
507
508 clk_put(mck_clk);
509
510 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CMR, div);
511
512 /*
513 * Setup the TFMR and RFMR for the proper data format.
514 */
515 tfmr =
516 (( AT91_SSC_FSEDGE_POSITIVE ) & AT91_SSC_FSEDGE)
517 | (( 0 << 23) & AT91_SSC_FSDEN)
518 | (( AT91_SSC_FSOS_NEGATIVE ) & AT91_SSC_FSOS)
519 | (((bits - 1) << 16) & AT91_SSC_FSLEN)
520 | (((channels - 1) << 8) & AT91_SSC_DATNB)
521 | (( 1 << 7) & AT91_SSC_MSBF)
522 | (( 0 << 5) & AT91_SSC_DATDEF)
523 | (((bits - 1) << 0) & AT91_SSC_DATALEN);
524 DBG("SSC_TFMR=0x%08x\n", tfmr);
525 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_TFMR, tfmr);
526
527 rfmr =
528 (( AT91_SSC_FSEDGE_POSITIVE ) & AT91_SSC_FSEDGE)
529 | (( AT91_SSC_FSOS_NONE ) & AT91_SSC_FSOS)
530 | (( 0 << 16) & AT91_SSC_FSLEN)
531 | (((channels - 1) << 8) & AT91_SSC_DATNB)
532 | (( 1 << 7) & AT91_SSC_MSBF)
533 | (( 0 << 5) & AT91_SSC_LOOP)
534 | (((bits - 1) << 0) & AT91_SSC_DATALEN);
535
536 DBG("SSC_RFMR=0x%08x\n", rfmr);
537 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RFMR, rfmr);
538
539 /*
540 * Setup the TCMR and RCMR to generate the proper BCLK
541 * and LRC signals.
542 */
543 tcmr =
544 (( period << 24) & AT91_SSC_PERIOD)
545 | (( 1 << 16) & AT91_SSC_STTDLY)
546 | (( AT91_SSC_START_FALLING_RF ) & AT91_SSC_START)
547 | (( AT91_SSC_CKI_FALLING ) & AT91_SSC_CKI)
548 | (( AT91_SSC_CKO_CONTINUOUS ) & AT91_SSC_CKO)
549 | (( AT91_SSC_CKS_DIV ) & AT91_SSC_CKS);
550
551 DBG("SSC_TCMR=0x%08x\n", tcmr);
552 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_TCMR, tcmr);
553
554 rcmr =
555 (( 0 << 24) & AT91_SSC_PERIOD)
556 | (( 1 << 16) & AT91_SSC_STTDLY)
557 | (( AT91_SSC_START_TX_RX ) & AT91_SSC_START)
558 | (( AT91_SSC_CK_RISING ) & AT91_SSC_CKI)
559 | (( AT91_SSC_CKO_NONE ) & AT91_SSC_CKO)
560 | (( AT91_SSC_CKS_CLOCK ) & AT91_SSC_CKS);
561
562 DBG("SSC_RCMR=0x%08x\n", rcmr);
563 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RCMR, rcmr);
564
565 if ((ret = request_irq(ssc_p->ssc.pid, at91_i2s_interrupt, 520 if ((ret = request_irq(ssc_p->ssc.pid, at91_i2s_interrupt,
566 0, ssc_p->name, ssc_p)) < 0) { 521 0, ssc_p->name, ssc_p)) < 0) {
567 printk(KERN_WARNING "at91-i2s: request_irq failure\n"); 522 printk(KERN_WARNING "at91-i2s: request_irq failure\n");
523
524 DBG("Stopping pid %d clock\n", ssc_p->ssc.pid);
525 at91_sys_write(AT91_PMC_PCER, 1<<ssc_p->ssc.pid);
568 return ret; 526 return ret;
569 } 527 }
570 528
571 /*
572 * Save the current substream parameters in order to check
573 * that the substream in the opposite direction uses the
574 * same parameters.
575 */
576 ssc_p->pcmfmt = pcmfmt;
577 ssc_p->rate = rate;
578 ssc_p->initialized = 1; 529 ssc_p->initialized = 1;
579
580 DBG("hw_params: SSC initialized\n");
581 } 530 }
582 531
583 up(ssc_p->mutex); 532 /* set SSC clock mode register */
533 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CMR, ssc_p->cmr_div);
534
535 /* set receive clock mode and format */
536 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RCMR, rcmr);
537 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RFMR, rfmr);
538
539 /* set transmit clock mode and format */
540 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_TCMR, tcmr);
541 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_TFMR, tfmr);
584 542
543 DBG("hw_params: SSC initialized\n");
585 return 0; 544 return 0;
586} 545}
587 546
@@ -589,39 +548,112 @@ static int at91_i2s_hw_params(struct snd_pcm_substream *substream,
589static int at91_i2s_prepare(struct snd_pcm_substream *substream) 548static int at91_i2s_prepare(struct snd_pcm_substream *substream)
590{ 549{
591 struct snd_soc_pcm_runtime *rtd = substream->private_data; 550 struct snd_soc_pcm_runtime *rtd = substream->private_data;
592 struct at91_pcm_dma_params *dma_params = rtd->cpu_dai->dma_data; 551 struct at91_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id];
552 struct at91_pcm_dma_params *dma_params;
553 int dir;
554
555 dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1;
556 dma_params = ssc_p->dma_params[dir];
593 557
594 at91_ssc_write(dma_params->ssc_base + AT91_SSC_CR, 558 at91_ssc_write(dma_params->ssc_base + AT91_SSC_CR,
595 dma_params->mask->ssc_enable); 559 dma_params->mask->ssc_enable);
596 560
597 DBG("%s enabled SSC_SR=0x%08lx\n", 561 DBG("%s enabled SSC_SR=0x%08lx\n", dir ? "receive" : "transmit",
598 substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? "transmit" : "receive", 562 at91_ssc_read(dma_params->ssc_base + AT91_SSC_SR));
599 at91_ssc_read(ssc_info[rtd->cpu_dai->id].ssc.base + AT91_SSC_SR));
600 return 0; 563 return 0;
601} 564}
602 565
603 566
567#ifdef CONFIG_PM
568static int at91_i2s_suspend(struct platform_device *pdev,
569 struct snd_soc_cpu_dai *cpu_dai)
570{
571 struct at91_ssc_info *ssc_p;
572
573 if(!cpu_dai->active)
574 return 0;
575
576 ssc_p = &ssc_info[cpu_dai->id];
577
578 /* Save the status register before disabling transmit and receive. */
579 ssc_p->ssc_state.ssc_sr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_SR);
580 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CR,
581 AT91_SSC_TXDIS | AT91_SSC_RXDIS);
582
583 /* Save the current interrupt mask, then disable unmasked interrupts. */
584 ssc_p->ssc_state.ssc_imr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_IMR);
585 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_IDR, ssc_p->ssc_state.ssc_imr);
586
587 ssc_p->ssc_state.ssc_cmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_CMR);
588 ssc_p->ssc_state.ssc_rcmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_RCMR);
589 ssc_p->ssc_state.ssc_rfmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_RFMR);
590 ssc_p->ssc_state.ssc_tcmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_TCMR);
591 ssc_p->ssc_state.ssc_tfmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_TFMR);
592
593 return 0;
594}
595
596static int at91_i2s_resume(struct platform_device *pdev,
597 struct snd_soc_cpu_dai *cpu_dai)
598{
599 struct at91_ssc_info *ssc_p;
600
601 if(!cpu_dai->active)
602 return 0;
603
604 ssc_p = &ssc_info[cpu_dai->id];
605
606 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_TFMR, ssc_p->ssc_state.ssc_tfmr);
607 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_TCMR, ssc_p->ssc_state.ssc_tcmr);
608 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RFMR, ssc_p->ssc_state.ssc_rfmr);
609 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RCMR, ssc_p->ssc_state.ssc_rcmr);
610 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CMR, ssc_p->ssc_state.ssc_cmr);
611
612 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_IER, ssc_p->ssc_state.ssc_imr);
613
614 at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CR,
615 ((ssc_p->ssc_state.ssc_sr & AT91_SSC_RXENA) ? AT91_SSC_RXEN : 0) |
616 ((ssc_p->ssc_state.ssc_sr & AT91_SSC_TXENA) ? AT91_SSC_TXEN : 0));
617
618 return 0;
619}
620
621#else
622#define at91_i2s_suspend NULL
623#define at91_i2s_resume NULL
624#endif
625
626#define AT91_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
627 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\
628 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
629 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
630 SNDRV_PCM_RATE_96000)
631
604struct snd_soc_cpu_dai at91_i2s_dai[NUM_SSC_DEVICES] = { 632struct snd_soc_cpu_dai at91_i2s_dai[NUM_SSC_DEVICES] = {
605 { .name = "at91_ssc0/i2s", 633 { .name = "at91_ssc0/i2s",
606 .id = 0, 634 .id = 0,
607 .type = SND_SOC_DAI_I2S, 635 .type = SND_SOC_DAI_I2S,
608 .suspend = at91_i2s_suspend, 636 .suspend = at91_i2s_suspend,
609 .resume = at91_i2s_resume, 637 .resume = at91_i2s_resume,
610 .config_sysclk = at91_i2s_config_sysclk,
611 .playback = { 638 .playback = {
612 .channels_min = 1, 639 .channels_min = 1,
613 .channels_max = 2,}, 640 .channels_max = 2,
641 .rates = AT91_I2S_RATES,
642 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
614 .capture = { 643 .capture = {
615 .channels_min = 1, 644 .channels_min = 1,
616 .channels_max = 2,}, 645 .channels_max = 2,
646 .rates = AT91_I2S_RATES,
647 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
617 .ops = { 648 .ops = {
618 .startup = at91_i2s_startup, 649 .startup = at91_i2s_startup,
619 .shutdown = at91_i2s_shutdown, 650 .shutdown = at91_i2s_shutdown,
620 .prepare = at91_i2s_prepare, 651 .prepare = at91_i2s_prepare,
621 .hw_params = at91_i2s_hw_params,}, 652 .hw_params = at91_i2s_hw_params,},
622 .caps = { 653 .dai_ops = {
623 .mode = &at91_i2s[0], 654 .set_sysclk = at91_i2s_set_dai_sysclk,
624 .num_modes = ARRAY_SIZE(at91_i2s),}, 655 .set_fmt = at91_i2s_set_dai_fmt,
656 .set_clkdiv = at91_i2s_set_dai_clkdiv,},
625 .private_data = &ssc_info[0].ssc, 657 .private_data = &ssc_info[0].ssc,
626 }, 658 },
627#if NUM_SSC_DEVICES == 3 659#if NUM_SSC_DEVICES == 3
@@ -630,21 +662,25 @@ struct snd_soc_cpu_dai at91_i2s_dai[NUM_SSC_DEVICES] = {
630 .type = SND_SOC_DAI_I2S, 662 .type = SND_SOC_DAI_I2S,
631 .suspend = at91_i2s_suspend, 663 .suspend = at91_i2s_suspend,
632 .resume = at91_i2s_resume, 664 .resume = at91_i2s_resume,
633 .config_sysclk = at91_i2s_config_sysclk,
634 .playback = { 665 .playback = {
635 .channels_min = 1, 666 .channels_min = 1,
636 .channels_max = 2,}, 667 .channels_max = 2,
668 .rates = AT91_I2S_RATES,
669 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
637 .capture = { 670 .capture = {
638 .channels_min = 1, 671 .channels_min = 1,
639 .channels_max = 2,}, 672 .channels_max = 2,
673 .rates = AT91_I2S_RATES,
674 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
640 .ops = { 675 .ops = {
641 .startup = at91_i2s_startup, 676 .startup = at91_i2s_startup,
642 .shutdown = at91_i2s_shutdown, 677 .shutdown = at91_i2s_shutdown,
643 .prepare = at91_i2s_prepare, 678 .prepare = at91_i2s_prepare,
644 .hw_params = at91_i2s_hw_params,}, 679 .hw_params = at91_i2s_hw_params,},
645 .caps = { 680 .dai_ops = {
646 .mode = &at91_i2s[0], 681 .set_sysclk = at91_i2s_set_dai_sysclk,
647 .num_modes = ARRAY_SIZE(at91_i2s),}, 682 .set_fmt = at91_i2s_set_dai_fmt,
683 .set_clkdiv = at91_i2s_set_dai_clkdiv,},
648 .private_data = &ssc_info[1].ssc, 684 .private_data = &ssc_info[1].ssc,
649 }, 685 },
650 { .name = "at91_ssc2/i2s", 686 { .name = "at91_ssc2/i2s",
@@ -652,21 +688,25 @@ struct snd_soc_cpu_dai at91_i2s_dai[NUM_SSC_DEVICES] = {
652 .type = SND_SOC_DAI_I2S, 688 .type = SND_SOC_DAI_I2S,
653 .suspend = at91_i2s_suspend, 689 .suspend = at91_i2s_suspend,
654 .resume = at91_i2s_resume, 690 .resume = at91_i2s_resume,
655 .config_sysclk = at91_i2s_config_sysclk,
656 .playback = { 691 .playback = {
657 .channels_min = 1, 692 .channels_min = 1,
658 .channels_max = 2,}, 693 .channels_max = 2,
694 .rates = AT91_I2S_RATES,
695 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
659 .capture = { 696 .capture = {
660 .channels_min = 1, 697 .channels_min = 1,
661 .channels_max = 2,}, 698 .channels_max = 2,
699 .rates = AT91_I2S_RATES,
700 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
662 .ops = { 701 .ops = {
663 .startup = at91_i2s_startup, 702 .startup = at91_i2s_startup,
664 .shutdown = at91_i2s_shutdown, 703 .shutdown = at91_i2s_shutdown,
665 .prepare = at91_i2s_prepare, 704 .prepare = at91_i2s_prepare,
666 .hw_params = at91_i2s_hw_params,}, 705 .hw_params = at91_i2s_hw_params,},
667 .caps = { 706 .dai_ops = {
668 .mode = &at91_i2s[0], 707 .set_sysclk = at91_i2s_set_dai_sysclk,
669 .num_modes = ARRAY_SIZE(at91_i2s),}, 708 .set_fmt = at91_i2s_set_dai_fmt,
709 .set_clkdiv = at91_i2s_set_dai_clkdiv,},
670 .private_data = &ssc_info[2].ssc, 710 .private_data = &ssc_info[2].ssc,
671 }, 711 },
672#endif 712#endif
diff --git a/sound/soc/at91/at91-i2s.h b/sound/soc/at91/at91-i2s.h
new file mode 100644
index 000000000000..f8a875ba0ccc
--- /dev/null
+++ b/sound/soc/at91/at91-i2s.h
@@ -0,0 +1,27 @@
1/*
2 * at91-i2s.h - ALSA I2S interface for the Atmel AT91 SoC
3 *
4 * Author: Frank Mandarino <fmandarino@endrelia.com>
5 * Endrelia Technologies Inc.
6 * Created: Jan 9, 2007
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#ifndef _AT91_I2S_H
14#define _AT91_I2S_H
15
16/* I2S system clock ids */
17#define AT91_SYSCLK_MCK 0 /* SSC uses AT91 MCK as system clock */
18
19/* I2S divider ids */
20#define AT91SSC_CMR_DIV 0 /* MCK divider for BCLK */
21#define AT91SSC_TCMR_PERIOD 1 /* BCLK divider for transmit FS */
22#define AT91SSC_RCMR_PERIOD 2 /* BCLK divider for receive FS */
23
24extern struct snd_soc_cpu_dai at91_i2s_dai[];
25
26#endif /* _AT91_I2S_H */
27
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