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ASoC: fix typo and removed unneeded switch case for cs4270
[deliverable/linux.git] / sound / soc / fsl / mpc5200_psc_i2s.c
CommitLineData
dc641378
GL		 1/*
2 * Freescale MPC5200 PSC in I2S mode
3 * ALSA SoC Digital Audio Interface (DAI) driver
4 *
5 * Copyright (C) 2008 Secret Lab Technologies Ltd.
6 */
7
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/interrupt.h>
11#include <linux/device.h>
12#include <linux/delay.h>
13#include <linux/of_device.h>
14#include <linux/of_platform.h>
15#include <linux/dma-mapping.h>
16
17#include <sound/core.h>
18#include <sound/pcm.h>
19#include <sound/pcm_params.h>
20#include <sound/initval.h>
21#include <sound/soc.h>
22#include <sound/soc-of-simple.h>
23
24#include <sysdev/bestcomm/bestcomm.h>
25#include <sysdev/bestcomm/gen_bd.h>
26#include <asm/mpc52xx_psc.h>
27
28MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
29MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
30MODULE_LICENSE("GPL");
31
32/**
33 * PSC_I2S_RATES: sample rates supported by the I2S
34 *
35 * This driver currently only supports the PSC running in I2S slave mode,
36 * which means the codec determines the sample rate. Therefore, we tell
37 * ALSA that we support all rates and let the codec driver decide what rates
38 * are really supported.
39 */
40#define PSC_I2S_RATES (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_192000 | \
41 SNDRV_PCM_RATE_CONTINUOUS)
42
43/**
44 * PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode
45 */
46#define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \
47 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S24_BE | \
48 SNDRV_PCM_FMTBIT_S32_BE)
49
50/**
51 * psc_i2s_stream - Data specific to a single stream (playback or capture)
52 * @active: flag indicating if the stream is active
53 * @psc_i2s: pointer back to parent psc_i2s data structure
54 * @bcom_task: bestcomm task structure
55 * @irq: irq number for bestcomm task
56 * @period_start: physical address of start of DMA region
57 * @period_end: physical address of end of DMA region
58 * @period_next_pt: physical address of next DMA buffer to enqueue
59 * @period_bytes: size of DMA period in bytes
60 */
61struct psc_i2s_stream {
62 int active;
63 struct psc_i2s *psc_i2s;
64 struct bcom_task *bcom_task;
65 int irq;
66 struct snd_pcm_substream *stream;
67 dma_addr_t period_start;
68 dma_addr_t period_end;
69 dma_addr_t period_next_pt;
70 dma_addr_t period_current_pt;
71 int period_bytes;
72};
73
74/**
75 * psc_i2s - Private driver data
76 * @name: short name for this device ("PSC0", "PSC1", etc)
77 * @psc_regs: pointer to the PSC's registers
78 * @fifo_regs: pointer to the PSC's FIFO registers
79 * @irq: IRQ of this PSC
80 * @dev: struct device pointer
81 * @dai: the CPU DAI for this device
82 * @sicr: Base value used in serial interface control register; mode is ORed
83 * with this value.
84 * @playback: Playback stream context data
85 * @capture: Capture stream context data
86 */
87struct psc_i2s {
88 char name[32];
89 struct mpc52xx_psc __iomem *psc_regs;
90 struct mpc52xx_psc_fifo __iomem *fifo_regs;
91 unsigned int irq;
92 struct device *dev;
93 struct snd_soc_dai dai;
94 spinlock_t lock;
95 u32 sicr;
96
97 /* per-stream data */
98 struct psc_i2s_stream playback;
99 struct psc_i2s_stream capture;
100
101 /* Statistics */
102 struct {
103 int overrun_count;
104 int underrun_count;
105 } stats;
106};
107
108/*
109 * Interrupt handlers
110 */
111static irqreturn_t psc_i2s_status_irq(int irq, void *_psc_i2s)
112{
113 struct psc_i2s *psc_i2s = _psc_i2s;
114 struct mpc52xx_psc __iomem *regs = psc_i2s->psc_regs;
115 u16 isr;
116
117 isr = in_be16(&regs->mpc52xx_psc_isr);
118
119 /* Playback underrun error */
120 if (psc_i2s->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
121 psc_i2s->stats.underrun_count++;
122
123 /* Capture overrun error */
124 if (psc_i2s->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
125 psc_i2s->stats.overrun_count++;
126
127 out_8(&regs->command, 4 << 4); /* reset the error status */
128
129 return IRQ_HANDLED;
130}
131
132/**
133 * psc_i2s_bcom_enqueue_next_buffer - Enqueue another audio buffer
134 * @s: pointer to stream private data structure
135 *
136 * Enqueues another audio period buffer into the bestcomm queue.
137 *
138 * Note: The routine must only be called when there is space available in
139 * the queue. Otherwise the enqueue will fail and the audio ring buffer
140 * will get out of sync
141 */
142static void psc_i2s_bcom_enqueue_next_buffer(struct psc_i2s_stream *s)
143{
144 struct bcom_bd *bd;
145
146 /* Prepare and enqueue the next buffer descriptor */
147 bd = bcom_prepare_next_buffer(s->bcom_task);
148 bd->status = s->period_bytes;
149 bd->data[0] = s->period_next_pt;
150 bcom_submit_next_buffer(s->bcom_task, NULL);
151
152 /* Update for next period */
153 s->period_next_pt += s->period_bytes;
154 if (s->period_next_pt >= s->period_end)
155 s->period_next_pt = s->period_start;
156}
157
158/* Bestcomm DMA irq handler */
159static irqreturn_t psc_i2s_bcom_irq(int irq, void *_psc_i2s_stream)
160{
161 struct psc_i2s_stream *s = _psc_i2s_stream;
162
163 /* For each finished period, dequeue the completed period buffer
164 * and enqueue a new one in it's place. */
165 while (bcom_buffer_done(s->bcom_task)) {
166 bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
167 s->period_current_pt += s->period_bytes;
168 if (s->period_current_pt >= s->period_end)
169 s->period_current_pt = s->period_start;
170 psc_i2s_bcom_enqueue_next_buffer(s);
171 bcom_enable(s->bcom_task);
172 }
173
174 /* If the stream is active, then also inform the PCM middle layer
175 * of the period finished event. */
176 if (s->active)
177 snd_pcm_period_elapsed(s->stream);
178
179 return IRQ_HANDLED;
180}
181
182/**
183 * psc_i2s_startup: create a new substream
184 *
185 * This is the first function called when a stream is opened.
186 *
187 * If this is the first stream open, then grab the IRQ and program most of
188 * the PSC registers.
189 */
dee89c4d
MB		 190static int psc_i2s_startup(struct snd_pcm_substream *substream,
191 struct snd_soc_dai *dai)
dc641378
GL		 192{
193 struct snd_soc_pcm_runtime *rtd = substream->private_data;
194 struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
195 int rc;
196
197 dev_dbg(psc_i2s->dev, "psc_i2s_startup(substream=%p)\n", substream);
198
199 if (!psc_i2s->playback.active &&
200 !psc_i2s->capture.active) {
201 /* Setup the IRQs */
202 rc = request_irq(psc_i2s->irq, &psc_i2s_status_irq, IRQF_SHARED,
203 "psc-i2s-status", psc_i2s);
204 rc |= request_irq(psc_i2s->capture.irq,
205 &psc_i2s_bcom_irq, IRQF_SHARED,
206 "psc-i2s-capture", &psc_i2s->capture);
207 rc |= request_irq(psc_i2s->playback.irq,
208 &psc_i2s_bcom_irq, IRQF_SHARED,
209 "psc-i2s-playback", &psc_i2s->playback);
210 if (rc) {
211 free_irq(psc_i2s->irq, psc_i2s);
212 free_irq(psc_i2s->capture.irq,
213 &psc_i2s->capture);
214 free_irq(psc_i2s->playback.irq,
215 &psc_i2s->playback);
216 return -ENODEV;
217 }
218 }
219
220 return 0;
221}
222
223static int psc_i2s_hw_params(struct snd_pcm_substream *substream,
dee89c4d
MB		 224 struct snd_pcm_hw_params *params,
225 struct snd_soc_dai *dai)
dc641378
GL		 226{
227 struct snd_soc_pcm_runtime *rtd = substream->private_data;
228 struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
229 u32 mode;
230
231 dev_dbg(psc_i2s->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
232 " periods=%i buffer_size=%i buffer_bytes=%i\n",
233 __func__, substream, params_period_size(params),
234 params_period_bytes(params), params_periods(params),
235 params_buffer_size(params), params_buffer_bytes(params));
236
237 switch (params_format(params)) {
238 case SNDRV_PCM_FORMAT_S8:
239 mode = MPC52xx_PSC_SICR_SIM_CODEC_8;
240 break;
241 case SNDRV_PCM_FORMAT_S16_BE:
242 mode = MPC52xx_PSC_SICR_SIM_CODEC_16;
243 break;
244 case SNDRV_PCM_FORMAT_S24_BE:
245 mode = MPC52xx_PSC_SICR_SIM_CODEC_24;
246 break;
247 case SNDRV_PCM_FORMAT_S32_BE:
248 mode = MPC52xx_PSC_SICR_SIM_CODEC_32;
249 break;
250 default:
251 dev_dbg(psc_i2s->dev, "invalid format\n");
252 return -EINVAL;
253 }
254 out_be32(&psc_i2s->psc_regs->sicr, psc_i2s->sicr | mode);
255
256 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
257
258 return 0;
259}
260
dee89c4d
MB		 261static int psc_i2s_hw_free(struct snd_pcm_substream *substream,
262 struct snd_soc_dai *dai)
dc641378
GL		 263{
264 snd_pcm_set_runtime_buffer(substream, NULL);
265 return 0;
266}
267
268/**
269 * psc_i2s_trigger: start and stop the DMA transfer.
270 *
271 * This function is called by ALSA to start, stop, pause, and resume the DMA
272 * transfer of data.
273 */
dee89c4d
MB		 274static int psc_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
275 struct snd_soc_dai *dai)
dc641378
GL		 276{
277 struct snd_soc_pcm_runtime *rtd = substream->private_data;
278 struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
279 struct snd_pcm_runtime *runtime = substream->runtime;
280 struct psc_i2s_stream *s;
281 struct mpc52xx_psc __iomem *regs = psc_i2s->psc_regs;
282 u16 imr;
283 u8 psc_cmd;
f06c8fd7 284 unsigned long flags;
dc641378
GL		 285
286 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
287 s = &psc_i2s->capture;
288 else
289 s = &psc_i2s->playback;
290
291 dev_dbg(psc_i2s->dev, "psc_i2s_trigger(substream=%p, cmd=%i)"
292 " stream_id=%i\n",
293 substream, cmd, substream->pstr->stream);
294
295 switch (cmd) {
296 case SNDRV_PCM_TRIGGER_START:
297 s->period_bytes = frames_to_bytes(runtime,
298 runtime->period_size);
299 s->period_start = virt_to_phys(runtime->dma_area);
300 s->period_end = s->period_start +
301 (s->period_bytes * runtime->periods);
302 s->period_next_pt = s->period_start;
303 s->period_current_pt = s->period_start;
304 s->active = 1;
305
306 /* First; reset everything */
307 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
308 out_8(&regs->command, MPC52xx_PSC_RST_RX);
309 out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
310 } else {
311 out_8(&regs->command, MPC52xx_PSC_RST_TX);
312 out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
313 }
314
315 /* Next, fill up the bestcomm bd queue and enable DMA.
316 * This will begin filling the PSC's fifo. */
317 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
318 bcom_gen_bd_rx_reset(s->bcom_task);
319 else
320 bcom_gen_bd_tx_reset(s->bcom_task);
321 while (!bcom_queue_full(s->bcom_task))
322 psc_i2s_bcom_enqueue_next_buffer(s);
323 bcom_enable(s->bcom_task);
324
325 /* Due to errata in the i2s mode; need to line up enabling
326 * the transmitter with a transition on the frame sync
327 * line */
328
329 spin_lock_irqsave(&psc_i2s->lock, flags);
330 /* first make sure it is low */
331 while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) != 0)
332 ;
333 /* then wait for the transition to high */
334 while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) == 0)
335 ;
336 /* Finally, enable the PSC.
337 * Receiver must always be enabled; even when we only want
338 * transmit. (see 15.3.2.3 of MPC5200B User's Guide) */
339 psc_cmd = MPC52xx_PSC_RX_ENABLE;
340 if (substream->pstr->stream == SNDRV_PCM_STREAM_PLAYBACK)
341 psc_cmd |= MPC52xx_PSC_TX_ENABLE;
342 out_8(&regs->command, psc_cmd);
343 spin_unlock_irqrestore(&psc_i2s->lock, flags);
344
345 break;
346
347 case SNDRV_PCM_TRIGGER_STOP:
348 /* Turn off the PSC */
349 s->active = 0;
350 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
351 if (!psc_i2s->playback.active) {
352 out_8(&regs->command, 2 << 4); /* reset rx */
353 out_8(&regs->command, 3 << 4); /* reset tx */
354 out_8(&regs->command, 4 << 4); /* reset err */
355 }
356 } else {
357 out_8(&regs->command, 3 << 4); /* reset tx */
358 out_8(&regs->command, 4 << 4); /* reset err */
359 if (!psc_i2s->capture.active)
360 out_8(&regs->command, 2 << 4); /* reset rx */
361 }
362
363 bcom_disable(s->bcom_task);
364 while (!bcom_queue_empty(s->bcom_task))
365 bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
366
367 break;
368
369 default:
370 dev_dbg(psc_i2s->dev, "invalid command\n");
371 return -EINVAL;
372 }
373
374 /* Update interrupt enable settings */
375 imr = 0;
376 if (psc_i2s->playback.active)
377 imr |= MPC52xx_PSC_IMR_TXEMP;
378 if (psc_i2s->capture.active)
379 imr |= MPC52xx_PSC_IMR_ORERR;
380 out_be16(&regs->isr_imr.imr, imr);
381
382 return 0;
383}
384
385/**
386 * psc_i2s_shutdown: shutdown the data transfer on a stream
387 *
388 * Shutdown the PSC if there are no other substreams open.
389 */
dee89c4d
MB		 390static void psc_i2s_shutdown(struct snd_pcm_substream *substream,
391 struct snd_soc_dai *dai)
dc641378
GL		 392{
393 struct snd_soc_pcm_runtime *rtd = substream->private_data;
394 struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
395
396 dev_dbg(psc_i2s->dev, "psc_i2s_shutdown(substream=%p)\n", substream);
397
398 /*
399 * If this is the last active substream, disable the PSC and release
400 * the IRQ.
401 */
402 if (!psc_i2s->playback.active &&
403 !psc_i2s->capture.active) {
404
405 /* Disable all interrupts and reset the PSC */
406 out_be16(&psc_i2s->psc_regs->isr_imr.imr, 0);
407 out_8(&psc_i2s->psc_regs->command, 3 << 4); /* reset tx */
408 out_8(&psc_i2s->psc_regs->command, 2 << 4); /* reset rx */
409 out_8(&psc_i2s->psc_regs->command, 1 << 4); /* reset mode */
410 out_8(&psc_i2s->psc_regs->command, 4 << 4); /* reset error */
411
412 /* Release irqs */
413 free_irq(psc_i2s->irq, psc_i2s);
414 free_irq(psc_i2s->capture.irq, &psc_i2s->capture);
415 free_irq(psc_i2s->playback.irq, &psc_i2s->playback);
416 }
417}
418
419/**
420 * psc_i2s_set_sysclk: set the clock frequency and direction
421 *
422 * This function is called by the machine driver to tell us what the clock
423 * frequency and direction are.
424 *
425 * Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN),
426 * and we don't care about the frequency. Return an error if the direction
427 * is not SND_SOC_CLOCK_IN.
428 *
429 * @clk_id: reserved, should be zero
430 * @freq: the frequency of the given clock ID, currently ignored
431 * @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master)
432 */
433static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
434 int clk_id, unsigned int freq, int dir)
435{
436 struct psc_i2s *psc_i2s = cpu_dai->private_data;
437 dev_dbg(psc_i2s->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n",
438 cpu_dai, dir);
439 return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL;
440}
441
442/**
443 * psc_i2s_set_fmt: set the serial format.
444 *
445 * This function is called by the machine driver to tell us what serial
446 * format to use.
447 *
448 * This driver only supports I2S mode. Return an error if the format is
449 * not SND_SOC_DAIFMT_I2S.
450 *
451 * @format: one of SND_SOC_DAIFMT_xxx
452 */
453static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format)
454{
455 struct psc_i2s *psc_i2s = cpu_dai->private_data;
456 dev_dbg(psc_i2s->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n",
457 cpu_dai, format);
458 return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL;
459}
460
461/* ---------------------------------------------------------------------
462 * ALSA SoC Bindings
463 *
464 * - Digital Audio Interface (DAI) template
465 * - create/destroy dai hooks
466 */
467
468/**
469 * psc_i2s_dai_template: template CPU Digital Audio Interface
470 */
471static struct snd_soc_dai psc_i2s_dai_template = {
dc641378
GL		 472 .playback = {
473 .channels_min = 2,
474 .channels_max = 2,
475 .rates = PSC_I2S_RATES,
476 .formats = PSC_I2S_FORMATS,
477 },
478 .capture = {
479 .channels_min = 2,
480 .channels_max = 2,
481 .rates = PSC_I2S_RATES,
482 .formats = PSC_I2S_FORMATS,
483 },
484 .ops = {
485 .startup = psc_i2s_startup,
486 .hw_params = psc_i2s_hw_params,
487 .hw_free = psc_i2s_hw_free,
488 .shutdown = psc_i2s_shutdown,
489 .trigger = psc_i2s_trigger,
dc641378
GL		 490 .set_sysclk = psc_i2s_set_sysclk,
491 .set_fmt = psc_i2s_set_fmt,
492 },
493};
494
495/* ---------------------------------------------------------------------
496 * The PSC I2S 'ASoC platform' driver
497 *
498 * Can be referenced by an 'ASoC machine' driver
499 * This driver only deals with the audio bus; it doesn't have any
500 * interaction with the attached codec
501 */
502
503static const struct snd_pcm_hardware psc_i2s_pcm_hardware = {
504 .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
505 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER,
506 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |
507 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE,
508 .rate_min = 8000,
509 .rate_max = 48000,
510 .channels_min = 2,
511 .channels_max = 2,
512 .period_bytes_max = 1024 * 1024,
513 .period_bytes_min = 32,
514 .periods_min = 2,
515 .periods_max = 256,
516 .buffer_bytes_max = 2 * 1024 * 1024,
517 .fifo_size = 0,
518};
519
520static int psc_i2s_pcm_open(struct snd_pcm_substream *substream)
521{
522 struct snd_soc_pcm_runtime *rtd = substream->private_data;
523 struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
524 struct psc_i2s_stream *s;
525
526 dev_dbg(psc_i2s->dev, "psc_i2s_pcm_open(substream=%p)\n", substream);
527
528 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
529 s = &psc_i2s->capture;
530 else
531 s = &psc_i2s->playback;
532
533 snd_soc_set_runtime_hwparams(substream, &psc_i2s_pcm_hardware);
534
535 s->stream = substream;
536 return 0;
537}
538
539static int psc_i2s_pcm_close(struct snd_pcm_substream *substream)
540{
541 struct snd_soc_pcm_runtime *rtd = substream->private_data;
542 struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
543 struct psc_i2s_stream *s;
544
545 dev_dbg(psc_i2s->dev, "psc_i2s_pcm_close(substream=%p)\n", substream);
546
547 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
548 s = &psc_i2s->capture;
549 else
550 s = &psc_i2s->playback;
551
552 s->stream = NULL;
553 return 0;
554}
555
556static snd_pcm_uframes_t
557psc_i2s_pcm_pointer(struct snd_pcm_substream *substream)
558{
559 struct snd_soc_pcm_runtime *rtd = substream->private_data;
560 struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
561 struct psc_i2s_stream *s;
562 dma_addr_t count;
563
564 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
565 s = &psc_i2s->capture;
566 else
567 s = &psc_i2s->playback;
568
569 count = s->period_current_pt - s->period_start;
570
571 return bytes_to_frames(substream->runtime, count);
572}
573
574static struct snd_pcm_ops psc_i2s_pcm_ops = {
575 .open = psc_i2s_pcm_open,
576 .close = psc_i2s_pcm_close,
577 .ioctl = snd_pcm_lib_ioctl,
578 .pointer = psc_i2s_pcm_pointer,
579};
580
581static u64 psc_i2s_pcm_dmamask = 0xffffffff;
582static int psc_i2s_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
583 struct snd_pcm *pcm)
584{
585 struct snd_soc_pcm_runtime *rtd = pcm->private_data;
586 size_t size = psc_i2s_pcm_hardware.buffer_bytes_max;
587 int rc = 0;
588
589 dev_dbg(rtd->socdev->dev, "psc_i2s_pcm_new(card=%p, dai=%p, pcm=%p)\n",
590 card, dai, pcm);
591
592 if (!card->dev->dma_mask)
593 card->dev->dma_mask = &psc_i2s_pcm_dmamask;
594 if (!card->dev->coherent_dma_mask)
595 card->dev->coherent_dma_mask = 0xffffffff;
596
597 if (pcm->streams[0].substream) {
598 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev, size,
599 &pcm->streams[0].substream->dma_buffer);
600 if (rc)
601 goto playback_alloc_err;
602 }
603
604 if (pcm->streams[1].substream) {
605 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev, size,
606 &pcm->streams[1].substream->dma_buffer);
607 if (rc)
608 goto capture_alloc_err;
609 }
610
611 return 0;
612
613 capture_alloc_err:
614 if (pcm->streams[0].substream)
615 snd_dma_free_pages(&pcm->streams[0].substream->dma_buffer);
616 playback_alloc_err:
617 dev_err(card->dev, "Cannot allocate buffer(s)\n");
618 return -ENOMEM;
619}
620
621static void psc_i2s_pcm_free(struct snd_pcm *pcm)
622{
623 struct snd_soc_pcm_runtime *rtd = pcm->private_data;
624 struct snd_pcm_substream *substream;
625 int stream;
626
627 dev_dbg(rtd->socdev->dev, "psc_i2s_pcm_free(pcm=%p)\n", pcm);
628
629 for (stream = 0; stream < 2; stream++) {
630 substream = pcm->streams[stream].substream;
631 if (substream) {
632 snd_dma_free_pages(&substream->dma_buffer);
633 substream->dma_buffer.area = NULL;
634 substream->dma_buffer.addr = 0;
635 }
636 }
637}
638
639struct snd_soc_platform psc_i2s_pcm_soc_platform = {
640 .name = "mpc5200-psc-audio",
641 .pcm_ops = &psc_i2s_pcm_ops,
642 .pcm_new = &psc_i2s_pcm_new,
643 .pcm_free = &psc_i2s_pcm_free,
644};
645
646/* ---------------------------------------------------------------------
647 * Sysfs attributes for debugging
648 */
649
650static ssize_t psc_i2s_status_show(struct device *dev,
651 struct device_attribute *attr, char *buf)
652{
653 struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
654
655 return sprintf(buf, "status=%.4x sicr=%.8x rfnum=%i rfstat=0x%.4x "
656 "tfnum=%i tfstat=0x%.4x\n",
657 in_be16(&psc_i2s->psc_regs->sr_csr.status),
658 in_be32(&psc_i2s->psc_regs->sicr),
659 in_be16(&psc_i2s->fifo_regs->rfnum) & 0x1ff,
660 in_be16(&psc_i2s->fifo_regs->rfstat),
661 in_be16(&psc_i2s->fifo_regs->tfnum) & 0x1ff,
662 in_be16(&psc_i2s->fifo_regs->tfstat));
663}
664
665static int *psc_i2s_get_stat_attr(struct psc_i2s *psc_i2s, const char *name)
666{
667 if (strcmp(name, "playback_underrun") == 0)
668 return &psc_i2s->stats.underrun_count;
669 if (strcmp(name, "capture_overrun") == 0)
670 return &psc_i2s->stats.overrun_count;
671
672 return NULL;
673}
674
675static ssize_t psc_i2s_stat_show(struct device *dev,
676 struct device_attribute *attr, char *buf)
677{
678 struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
679 int *attrib;
680
681 attrib = psc_i2s_get_stat_attr(psc_i2s, attr->attr.name);
682 if (!attrib)
683 return 0;
684
685 return sprintf(buf, "%i\n", *attrib);
686}
687
688static ssize_t psc_i2s_stat_store(struct device *dev,
689 struct device_attribute *attr,
690 const char *buf,
691 size_t count)
692{
693 struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
694 int *attrib;
695
696 attrib = psc_i2s_get_stat_attr(psc_i2s, attr->attr.name);
697 if (!attrib)
698 return 0;
699
700 *attrib = simple_strtoul(buf, NULL, 0);
701 return count;
702}
703
f06c8fd7
JS		 704static DEVICE_ATTR(status, 0644, psc_i2s_status_show, NULL);
705static DEVICE_ATTR(playback_underrun, 0644, psc_i2s_stat_show,
706 psc_i2s_stat_store);
707static DEVICE_ATTR(capture_overrun, 0644, psc_i2s_stat_show,
708 psc_i2s_stat_store);
dc641378
GL		 709
710/* ---------------------------------------------------------------------
711 * OF platform bus binding code:
712 * - Probe/remove operations
713 * - OF device match table
714 */
715static int __devinit psc_i2s_of_probe(struct of_device *op,
716 const struct of_device_id *match)
717{
718 phys_addr_t fifo;
719 struct psc_i2s *psc_i2s;
720 struct resource res;
721 int size, psc_id, irq, rc;
722 const __be32 *prop;
723 void __iomem *regs;
724
725 dev_dbg(&op->dev, "probing psc i2s device\n");
726
727 /* Get the PSC ID */
728 prop = of_get_property(op->node, "cell-index", &size);
729 if (!prop || size < sizeof *prop)
730 return -ENODEV;
731 psc_id = be32_to_cpu(*prop);
732
733 /* Fetch the registers and IRQ of the PSC */
734 irq = irq_of_parse_and_map(op->node, 0);
735 if (of_address_to_resource(op->node, 0, &res)) {
736 dev_err(&op->dev, "Missing reg property\n");
737 return -ENODEV;
738 }
739 regs = ioremap(res.start, 1 + res.end - res.start);
740 if (!regs) {
741 dev_err(&op->dev, "Could not map registers\n");
742 return -ENODEV;
743 }
744
745 /* Allocate and initialize the driver private data */
746 psc_i2s = kzalloc(sizeof *psc_i2s, GFP_KERNEL);
747 if (!psc_i2s) {
748 iounmap(regs);
749 return -ENOMEM;
750 }
751 spin_lock_init(&psc_i2s->lock);
752 psc_i2s->irq = irq;
753 psc_i2s->psc_regs = regs;
754 psc_i2s->fifo_regs = regs + sizeof *psc_i2s->psc_regs;
755 psc_i2s->dev = &op->dev;
756 psc_i2s->playback.psc_i2s = psc_i2s;
757 psc_i2s->capture.psc_i2s = psc_i2s;
758 snprintf(psc_i2s->name, sizeof psc_i2s->name, "PSC%u", psc_id+1);
759
760 /* Fill out the CPU DAI structure */
761 memcpy(&psc_i2s->dai, &psc_i2s_dai_template, sizeof psc_i2s->dai);
762 psc_i2s->dai.private_data = psc_i2s;
763 psc_i2s->dai.name = psc_i2s->name;
764 psc_i2s->dai.id = psc_id;
765
766 /* Find the address of the fifo data registers and setup the
767 * DMA tasks */
768 fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
769 psc_i2s->capture.bcom_task =
770 bcom_psc_gen_bd_rx_init(psc_id, 10, fifo, 512);
771 psc_i2s->playback.bcom_task =
772 bcom_psc_gen_bd_tx_init(psc_id, 10, fifo);
773 if (!psc_i2s->capture.bcom_task ||
774 !psc_i2s->playback.bcom_task) {
775 dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
776 iounmap(regs);
777 kfree(psc_i2s);
778 return -ENODEV;
779 }
780
781 /* Disable all interrupts and reset the PSC */
782 out_be16(&psc_i2s->psc_regs->isr_imr.imr, 0);
783 out_8(&psc_i2s->psc_regs->command, 3 << 4); /* reset transmitter */
784 out_8(&psc_i2s->psc_regs->command, 2 << 4); /* reset receiver */
785 out_8(&psc_i2s->psc_regs->command, 1 << 4); /* reset mode */
786 out_8(&psc_i2s->psc_regs->command, 4 << 4); /* reset error */
787
788 /* Configure the serial interface mode; defaulting to CODEC8 mode */
789 psc_i2s->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S |
790 MPC52xx_PSC_SICR_CLKPOL;
791 if (of_get_property(op->node, "fsl,cellslave", NULL))
792 psc_i2s->sicr |= MPC52xx_PSC_SICR_CELLSLAVE |
793 MPC52xx_PSC_SICR_GENCLK;
794 out_be32(&psc_i2s->psc_regs->sicr,
795 psc_i2s->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8);
796
797 /* Check for the codec handle. If it is not present then we
798 * are done */
799 if (!of_get_property(op->node, "codec-handle", NULL))
800 return 0;
801
802 /* Set up mode register;
803 * First write: RxRdy (FIFO Alarm) generates rx FIFO irq
804 * Second write: register Normal mode for non loopback
805 */
806 out_8(&psc_i2s->psc_regs->mode, 0);
807 out_8(&psc_i2s->psc_regs->mode, 0);
808
809 /* Set the TX and RX fifo alarm thresholds */
810 out_be16(&psc_i2s->fifo_regs->rfalarm, 0x100);
811 out_8(&psc_i2s->fifo_regs->rfcntl, 0x4);
812 out_be16(&psc_i2s->fifo_regs->tfalarm, 0x100);
813 out_8(&psc_i2s->fifo_regs->tfcntl, 0x7);
814
815 /* Lookup the IRQ numbers */
816 psc_i2s->playback.irq =
817 bcom_get_task_irq(psc_i2s->playback.bcom_task);
818 psc_i2s->capture.irq =
819 bcom_get_task_irq(psc_i2s->capture.bcom_task);
820
821 /* Save what we've done so it can be found again later */
822 dev_set_drvdata(&op->dev, psc_i2s);
823
824 /* Register the SYSFS files */
825 rc = device_create_file(psc_i2s->dev, &dev_attr_status);
f06c8fd7
JS		 826 rc |= device_create_file(psc_i2s->dev, &dev_attr_capture_overrun);
827 rc |= device_create_file(psc_i2s->dev, &dev_attr_playback_underrun);
dc641378
GL		 828 if (rc)
829 dev_info(psc_i2s->dev, "error creating sysfs files\n");
830
958e792c
MB		 831 snd_soc_register_platform(&psc_i2s_pcm_soc_platform);
832
dc641378
GL		 833 /* Tell the ASoC OF helpers about it */
834 of_snd_soc_register_platform(&psc_i2s_pcm_soc_platform, op->node,
835 &psc_i2s->dai);
836
837 return 0;
838}
839
840static int __devexit psc_i2s_of_remove(struct of_device *op)
841{
842 struct psc_i2s *psc_i2s = dev_get_drvdata(&op->dev);
843
844 dev_dbg(&op->dev, "psc_i2s_remove()\n");
845
958e792c
MB		 846 snd_soc_unregister_platform(&psc_i2s_pcm_soc_platform);
847
dc641378
GL		 848 bcom_gen_bd_rx_release(psc_i2s->capture.bcom_task);
849 bcom_gen_bd_tx_release(psc_i2s->playback.bcom_task);
850
851 iounmap(psc_i2s->psc_regs);
852 iounmap(psc_i2s->fifo_regs);
853 kfree(psc_i2s);
854 dev_set_drvdata(&op->dev, NULL);
855
856 return 0;
857}
858
859/* Match table for of_platform binding */
860static struct of_device_id psc_i2s_match[] __devinitdata = {
861 { .compatible = "fsl,mpc5200-psc-i2s", },
862 {}
863};
864MODULE_DEVICE_TABLE(of, psc_i2s_match);
865
866static struct of_platform_driver psc_i2s_driver = {
867 .match_table = psc_i2s_match,
868 .probe = psc_i2s_of_probe,
869 .remove = __devexit_p(psc_i2s_of_remove),
870 .driver = {
871 .name = "mpc5200-psc-i2s",
872 .owner = THIS_MODULE,
873 },
874};
875
876/* ---------------------------------------------------------------------
877 * Module setup and teardown; simply register the of_platform driver
878 * for the PSC in I2S mode.
879 */
880static int __init psc_i2s_init(void)
881{
882 return of_register_platform_driver(&psc_i2s_driver);
883}
884module_init(psc_i2s_init);
885
886static void __exit psc_i2s_exit(void)
887{
888 of_unregister_platform_driver(&psc_i2s_driver);
889}
890module_exit(psc_i2s_exit);
891
892
Linux kernel - Deliverables
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