2 * Freescale MPC5200 PSC in I2S mode
3 * ALSA SoC Digital Audio Interface (DAI) driver
5 * Copyright (C) 2008 Secret Lab Technologies Ltd.
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>
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>
24 #include <sysdev/bestcomm/bestcomm.h>
25 #include <sysdev/bestcomm/gen_bd.h>
26 #include <asm/mpc52xx_psc.h>
28 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
29 MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
30 MODULE_LICENSE("GPL");
33 * PSC_I2S_RATES: sample rates supported by the I2S
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.
40 #define PSC_I2S_RATES (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_192000 | \
41 SNDRV_PCM_RATE_CONTINUOUS)
44 * PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode
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)
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
61 struct psc_i2s_stream
{
63 struct psc_i2s
*psc_i2s
;
64 struct bcom_task
*bcom_task
;
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
;
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
84 * @playback: Playback stream context data
85 * @capture: Capture stream context data
89 struct mpc52xx_psc __iomem
*psc_regs
;
90 struct mpc52xx_psc_fifo __iomem
*fifo_regs
;
93 struct snd_soc_dai dai
;
98 struct psc_i2s_stream playback
;
99 struct psc_i2s_stream capture
;
111 static irqreturn_t
psc_i2s_status_irq(int irq
, void *_psc_i2s
)
113 struct psc_i2s
*psc_i2s
= _psc_i2s
;
114 struct mpc52xx_psc __iomem
*regs
= psc_i2s
->psc_regs
;
117 isr
= in_be16(®s
->mpc52xx_psc_isr
);
119 /* Playback underrun error */
120 if (psc_i2s
->playback
.active
&& (isr
& MPC52xx_PSC_IMR_TXEMP
))
121 psc_i2s
->stats
.underrun_count
++;
123 /* Capture overrun error */
124 if (psc_i2s
->capture
.active
&& (isr
& MPC52xx_PSC_IMR_ORERR
))
125 psc_i2s
->stats
.overrun_count
++;
127 out_8(®s
->command
, 4 << 4); /* reset the error status */
133 * psc_i2s_bcom_enqueue_next_buffer - Enqueue another audio buffer
134 * @s: pointer to stream private data structure
136 * Enqueues another audio period buffer into the bestcomm queue.
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
142 static void psc_i2s_bcom_enqueue_next_buffer(struct psc_i2s_stream
*s
)
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
);
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
;
158 /* Bestcomm DMA irq handler */
159 static irqreturn_t
psc_i2s_bcom_irq(int irq
, void *_psc_i2s_stream
)
161 struct psc_i2s_stream
*s
= _psc_i2s_stream
;
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
);
174 /* If the stream is active, then also inform the PCM middle layer
175 * of the period finished event. */
177 snd_pcm_period_elapsed(s
->stream
);
183 * psc_i2s_startup: create a new substream
185 * This is the first function called when a stream is opened.
187 * If this is the first stream open, then grab the IRQ and program most of
190 static int psc_i2s_startup(struct snd_pcm_substream
*substream
)
192 struct snd_soc_pcm_runtime
*rtd
= substream
->private_data
;
193 struct psc_i2s
*psc_i2s
= rtd
->dai
->cpu_dai
->private_data
;
196 dev_dbg(psc_i2s
->dev
, "psc_i2s_startup(substream=%p)\n", substream
);
198 if (!psc_i2s
->playback
.active
&&
199 !psc_i2s
->capture
.active
) {
201 rc
= request_irq(psc_i2s
->irq
, &psc_i2s_status_irq
, IRQF_SHARED
,
202 "psc-i2s-status", psc_i2s
);
203 rc
|= request_irq(psc_i2s
->capture
.irq
,
204 &psc_i2s_bcom_irq
, IRQF_SHARED
,
205 "psc-i2s-capture", &psc_i2s
->capture
);
206 rc
|= request_irq(psc_i2s
->playback
.irq
,
207 &psc_i2s_bcom_irq
, IRQF_SHARED
,
208 "psc-i2s-playback", &psc_i2s
->playback
);
210 free_irq(psc_i2s
->irq
, psc_i2s
);
211 free_irq(psc_i2s
->capture
.irq
,
213 free_irq(psc_i2s
->playback
.irq
,
222 static int psc_i2s_hw_params(struct snd_pcm_substream
*substream
,
223 struct snd_pcm_hw_params
*params
)
225 struct snd_soc_pcm_runtime
*rtd
= substream
->private_data
;
226 struct psc_i2s
*psc_i2s
= rtd
->dai
->cpu_dai
->private_data
;
229 dev_dbg(psc_i2s
->dev
, "%s(substream=%p) p_size=%i p_bytes=%i"
230 " periods=%i buffer_size=%i buffer_bytes=%i\n",
231 __func__
, substream
, params_period_size(params
),
232 params_period_bytes(params
), params_periods(params
),
233 params_buffer_size(params
), params_buffer_bytes(params
));
235 switch (params_format(params
)) {
236 case SNDRV_PCM_FORMAT_S8
:
237 mode
= MPC52xx_PSC_SICR_SIM_CODEC_8
;
239 case SNDRV_PCM_FORMAT_S16_BE
:
240 mode
= MPC52xx_PSC_SICR_SIM_CODEC_16
;
242 case SNDRV_PCM_FORMAT_S24_BE
:
243 mode
= MPC52xx_PSC_SICR_SIM_CODEC_24
;
245 case SNDRV_PCM_FORMAT_S32_BE
:
246 mode
= MPC52xx_PSC_SICR_SIM_CODEC_32
;
249 dev_dbg(psc_i2s
->dev
, "invalid format\n");
252 out_be32(&psc_i2s
->psc_regs
->sicr
, psc_i2s
->sicr
| mode
);
254 snd_pcm_set_runtime_buffer(substream
, &substream
->dma_buffer
);
259 static int psc_i2s_hw_free(struct snd_pcm_substream
*substream
)
261 snd_pcm_set_runtime_buffer(substream
, NULL
);
266 * psc_i2s_trigger: start and stop the DMA transfer.
268 * This function is called by ALSA to start, stop, pause, and resume the DMA
271 static int psc_i2s_trigger(struct snd_pcm_substream
*substream
, int cmd
)
273 struct snd_soc_pcm_runtime
*rtd
= substream
->private_data
;
274 struct psc_i2s
*psc_i2s
= rtd
->dai
->cpu_dai
->private_data
;
275 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
276 struct psc_i2s_stream
*s
;
277 struct mpc52xx_psc __iomem
*regs
= psc_i2s
->psc_regs
;
282 if (substream
->pstr
->stream
== SNDRV_PCM_STREAM_CAPTURE
)
283 s
= &psc_i2s
->capture
;
285 s
= &psc_i2s
->playback
;
287 dev_dbg(psc_i2s
->dev
, "psc_i2s_trigger(substream=%p, cmd=%i)"
289 substream
, cmd
, substream
->pstr
->stream
);
292 case SNDRV_PCM_TRIGGER_START
:
293 s
->period_bytes
= frames_to_bytes(runtime
,
294 runtime
->period_size
);
295 s
->period_start
= virt_to_phys(runtime
->dma_area
);
296 s
->period_end
= s
->period_start
+
297 (s
->period_bytes
* runtime
->periods
);
298 s
->period_next_pt
= s
->period_start
;
299 s
->period_current_pt
= s
->period_start
;
302 /* First; reset everything */
303 if (substream
->pstr
->stream
== SNDRV_PCM_STREAM_CAPTURE
) {
304 out_8(®s
->command
, MPC52xx_PSC_RST_RX
);
305 out_8(®s
->command
, MPC52xx_PSC_RST_ERR_STAT
);
307 out_8(®s
->command
, MPC52xx_PSC_RST_TX
);
308 out_8(®s
->command
, MPC52xx_PSC_RST_ERR_STAT
);
311 /* Next, fill up the bestcomm bd queue and enable DMA.
312 * This will begin filling the PSC's fifo. */
313 if (substream
->pstr
->stream
== SNDRV_PCM_STREAM_CAPTURE
)
314 bcom_gen_bd_rx_reset(s
->bcom_task
);
316 bcom_gen_bd_tx_reset(s
->bcom_task
);
317 while (!bcom_queue_full(s
->bcom_task
))
318 psc_i2s_bcom_enqueue_next_buffer(s
);
319 bcom_enable(s
->bcom_task
);
321 /* Due to errata in the i2s mode; need to line up enabling
322 * the transmitter with a transition on the frame sync
325 spin_lock_irqsave(&psc_i2s
->lock
, flags
);
326 /* first make sure it is low */
327 while ((in_8(®s
->ipcr_acr
.ipcr
) & 0x80) != 0)
329 /* then wait for the transition to high */
330 while ((in_8(®s
->ipcr_acr
.ipcr
) & 0x80) == 0)
332 /* Finally, enable the PSC.
333 * Receiver must always be enabled; even when we only want
334 * transmit. (see 15.3.2.3 of MPC5200B User's Guide) */
335 psc_cmd
= MPC52xx_PSC_RX_ENABLE
;
336 if (substream
->pstr
->stream
== SNDRV_PCM_STREAM_PLAYBACK
)
337 psc_cmd
|= MPC52xx_PSC_TX_ENABLE
;
338 out_8(®s
->command
, psc_cmd
);
339 spin_unlock_irqrestore(&psc_i2s
->lock
, flags
);
343 case SNDRV_PCM_TRIGGER_STOP
:
344 /* Turn off the PSC */
346 if (substream
->pstr
->stream
== SNDRV_PCM_STREAM_CAPTURE
) {
347 if (!psc_i2s
->playback
.active
) {
348 out_8(®s
->command
, 2 << 4); /* reset rx */
349 out_8(®s
->command
, 3 << 4); /* reset tx */
350 out_8(®s
->command
, 4 << 4); /* reset err */
353 out_8(®s
->command
, 3 << 4); /* reset tx */
354 out_8(®s
->command
, 4 << 4); /* reset err */
355 if (!psc_i2s
->capture
.active
)
356 out_8(®s
->command
, 2 << 4); /* reset rx */
359 bcom_disable(s
->bcom_task
);
360 while (!bcom_queue_empty(s
->bcom_task
))
361 bcom_retrieve_buffer(s
->bcom_task
, NULL
, NULL
);
366 dev_dbg(psc_i2s
->dev
, "invalid command\n");
370 /* Update interrupt enable settings */
372 if (psc_i2s
->playback
.active
)
373 imr
|= MPC52xx_PSC_IMR_TXEMP
;
374 if (psc_i2s
->capture
.active
)
375 imr
|= MPC52xx_PSC_IMR_ORERR
;
376 out_be16(®s
->isr_imr
.imr
, imr
);
382 * psc_i2s_shutdown: shutdown the data transfer on a stream
384 * Shutdown the PSC if there are no other substreams open.
386 static void psc_i2s_shutdown(struct snd_pcm_substream
*substream
)
388 struct snd_soc_pcm_runtime
*rtd
= substream
->private_data
;
389 struct psc_i2s
*psc_i2s
= rtd
->dai
->cpu_dai
->private_data
;
391 dev_dbg(psc_i2s
->dev
, "psc_i2s_shutdown(substream=%p)\n", substream
);
394 * If this is the last active substream, disable the PSC and release
397 if (!psc_i2s
->playback
.active
&&
398 !psc_i2s
->capture
.active
) {
400 /* Disable all interrupts and reset the PSC */
401 out_be16(&psc_i2s
->psc_regs
->isr_imr
.imr
, 0);
402 out_8(&psc_i2s
->psc_regs
->command
, 3 << 4); /* reset tx */
403 out_8(&psc_i2s
->psc_regs
->command
, 2 << 4); /* reset rx */
404 out_8(&psc_i2s
->psc_regs
->command
, 1 << 4); /* reset mode */
405 out_8(&psc_i2s
->psc_regs
->command
, 4 << 4); /* reset error */
408 free_irq(psc_i2s
->irq
, psc_i2s
);
409 free_irq(psc_i2s
->capture
.irq
, &psc_i2s
->capture
);
410 free_irq(psc_i2s
->playback
.irq
, &psc_i2s
->playback
);
415 * psc_i2s_set_sysclk: set the clock frequency and direction
417 * This function is called by the machine driver to tell us what the clock
418 * frequency and direction are.
420 * Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN),
421 * and we don't care about the frequency. Return an error if the direction
422 * is not SND_SOC_CLOCK_IN.
424 * @clk_id: reserved, should be zero
425 * @freq: the frequency of the given clock ID, currently ignored
426 * @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master)
428 static int psc_i2s_set_sysclk(struct snd_soc_dai
*cpu_dai
,
429 int clk_id
, unsigned int freq
, int dir
)
431 struct psc_i2s
*psc_i2s
= cpu_dai
->private_data
;
432 dev_dbg(psc_i2s
->dev
, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n",
434 return (dir
== SND_SOC_CLOCK_IN
) ? 0 : -EINVAL
;
438 * psc_i2s_set_fmt: set the serial format.
440 * This function is called by the machine driver to tell us what serial
443 * This driver only supports I2S mode. Return an error if the format is
444 * not SND_SOC_DAIFMT_I2S.
446 * @format: one of SND_SOC_DAIFMT_xxx
448 static int psc_i2s_set_fmt(struct snd_soc_dai
*cpu_dai
, unsigned int format
)
450 struct psc_i2s
*psc_i2s
= cpu_dai
->private_data
;
451 dev_dbg(psc_i2s
->dev
, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n",
453 return (format
== SND_SOC_DAIFMT_I2S
) ? 0 : -EINVAL
;
456 /* ---------------------------------------------------------------------
459 * - Digital Audio Interface (DAI) template
460 * - create/destroy dai hooks
464 * psc_i2s_dai_template: template CPU Digital Audio Interface
466 static struct snd_soc_dai psc_i2s_dai_template
= {
467 .type
= SND_SOC_DAI_I2S
,
471 .rates
= PSC_I2S_RATES
,
472 .formats
= PSC_I2S_FORMATS
,
477 .rates
= PSC_I2S_RATES
,
478 .formats
= PSC_I2S_FORMATS
,
481 .startup
= psc_i2s_startup
,
482 .hw_params
= psc_i2s_hw_params
,
483 .hw_free
= psc_i2s_hw_free
,
484 .shutdown
= psc_i2s_shutdown
,
485 .trigger
= psc_i2s_trigger
,
488 .set_sysclk
= psc_i2s_set_sysclk
,
489 .set_fmt
= psc_i2s_set_fmt
,
493 /* ---------------------------------------------------------------------
494 * The PSC I2S 'ASoC platform' driver
496 * Can be referenced by an 'ASoC machine' driver
497 * This driver only deals with the audio bus; it doesn't have any
498 * interaction with the attached codec
501 static const struct snd_pcm_hardware psc_i2s_pcm_hardware
= {
502 .info
= SNDRV_PCM_INFO_MMAP
| SNDRV_PCM_INFO_MMAP_VALID
|
503 SNDRV_PCM_INFO_INTERLEAVED
| SNDRV_PCM_INFO_BLOCK_TRANSFER
,
504 .formats
= SNDRV_PCM_FMTBIT_S8
| SNDRV_PCM_FMTBIT_S16_BE
|
505 SNDRV_PCM_FMTBIT_S24_BE
| SNDRV_PCM_FMTBIT_S32_BE
,
510 .period_bytes_max
= 1024 * 1024,
511 .period_bytes_min
= 32,
514 .buffer_bytes_max
= 2 * 1024 * 1024,
518 static int psc_i2s_pcm_open(struct snd_pcm_substream
*substream
)
520 struct snd_soc_pcm_runtime
*rtd
= substream
->private_data
;
521 struct psc_i2s
*psc_i2s
= rtd
->dai
->cpu_dai
->private_data
;
522 struct psc_i2s_stream
*s
;
524 dev_dbg(psc_i2s
->dev
, "psc_i2s_pcm_open(substream=%p)\n", substream
);
526 if (substream
->pstr
->stream
== SNDRV_PCM_STREAM_CAPTURE
)
527 s
= &psc_i2s
->capture
;
529 s
= &psc_i2s
->playback
;
531 snd_soc_set_runtime_hwparams(substream
, &psc_i2s_pcm_hardware
);
533 s
->stream
= substream
;
537 static int psc_i2s_pcm_close(struct snd_pcm_substream
*substream
)
539 struct snd_soc_pcm_runtime
*rtd
= substream
->private_data
;
540 struct psc_i2s
*psc_i2s
= rtd
->dai
->cpu_dai
->private_data
;
541 struct psc_i2s_stream
*s
;
543 dev_dbg(psc_i2s
->dev
, "psc_i2s_pcm_close(substream=%p)\n", substream
);
545 if (substream
->pstr
->stream
== SNDRV_PCM_STREAM_CAPTURE
)
546 s
= &psc_i2s
->capture
;
548 s
= &psc_i2s
->playback
;
554 static snd_pcm_uframes_t
555 psc_i2s_pcm_pointer(struct snd_pcm_substream
*substream
)
557 struct snd_soc_pcm_runtime
*rtd
= substream
->private_data
;
558 struct psc_i2s
*psc_i2s
= rtd
->dai
->cpu_dai
->private_data
;
559 struct psc_i2s_stream
*s
;
562 if (substream
->pstr
->stream
== SNDRV_PCM_STREAM_CAPTURE
)
563 s
= &psc_i2s
->capture
;
565 s
= &psc_i2s
->playback
;
567 count
= s
->period_current_pt
- s
->period_start
;
569 return bytes_to_frames(substream
->runtime
, count
);
572 static struct snd_pcm_ops psc_i2s_pcm_ops
= {
573 .open
= psc_i2s_pcm_open
,
574 .close
= psc_i2s_pcm_close
,
575 .ioctl
= snd_pcm_lib_ioctl
,
576 .pointer
= psc_i2s_pcm_pointer
,
579 static u64 psc_i2s_pcm_dmamask
= 0xffffffff;
580 static int psc_i2s_pcm_new(struct snd_card
*card
, struct snd_soc_dai
*dai
,
583 struct snd_soc_pcm_runtime
*rtd
= pcm
->private_data
;
584 size_t size
= psc_i2s_pcm_hardware
.buffer_bytes_max
;
587 dev_dbg(rtd
->socdev
->dev
, "psc_i2s_pcm_new(card=%p, dai=%p, pcm=%p)\n",
590 if (!card
->dev
->dma_mask
)
591 card
->dev
->dma_mask
= &psc_i2s_pcm_dmamask
;
592 if (!card
->dev
->coherent_dma_mask
)
593 card
->dev
->coherent_dma_mask
= 0xffffffff;
595 if (pcm
->streams
[0].substream
) {
596 rc
= snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV
, pcm
->dev
, size
,
597 &pcm
->streams
[0].substream
->dma_buffer
);
599 goto playback_alloc_err
;
602 if (pcm
->streams
[1].substream
) {
603 rc
= snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV
, pcm
->dev
, size
,
604 &pcm
->streams
[1].substream
->dma_buffer
);
606 goto capture_alloc_err
;
612 if (pcm
->streams
[0].substream
)
613 snd_dma_free_pages(&pcm
->streams
[0].substream
->dma_buffer
);
615 dev_err(card
->dev
, "Cannot allocate buffer(s)\n");
619 static void psc_i2s_pcm_free(struct snd_pcm
*pcm
)
621 struct snd_soc_pcm_runtime
*rtd
= pcm
->private_data
;
622 struct snd_pcm_substream
*substream
;
625 dev_dbg(rtd
->socdev
->dev
, "psc_i2s_pcm_free(pcm=%p)\n", pcm
);
627 for (stream
= 0; stream
< 2; stream
++) {
628 substream
= pcm
->streams
[stream
].substream
;
630 snd_dma_free_pages(&substream
->dma_buffer
);
631 substream
->dma_buffer
.area
= NULL
;
632 substream
->dma_buffer
.addr
= 0;
637 struct snd_soc_platform psc_i2s_pcm_soc_platform
= {
638 .name
= "mpc5200-psc-audio",
639 .pcm_ops
= &psc_i2s_pcm_ops
,
640 .pcm_new
= &psc_i2s_pcm_new
,
641 .pcm_free
= &psc_i2s_pcm_free
,
644 /* ---------------------------------------------------------------------
645 * Sysfs attributes for debugging
648 static ssize_t
psc_i2s_status_show(struct device
*dev
,
649 struct device_attribute
*attr
, char *buf
)
651 struct psc_i2s
*psc_i2s
= dev_get_drvdata(dev
);
653 return sprintf(buf
, "status=%.4x sicr=%.8x rfnum=%i rfstat=0x%.4x "
654 "tfnum=%i tfstat=0x%.4x\n",
655 in_be16(&psc_i2s
->psc_regs
->sr_csr
.status
),
656 in_be32(&psc_i2s
->psc_regs
->sicr
),
657 in_be16(&psc_i2s
->fifo_regs
->rfnum
) & 0x1ff,
658 in_be16(&psc_i2s
->fifo_regs
->rfstat
),
659 in_be16(&psc_i2s
->fifo_regs
->tfnum
) & 0x1ff,
660 in_be16(&psc_i2s
->fifo_regs
->tfstat
));
663 static int *psc_i2s_get_stat_attr(struct psc_i2s
*psc_i2s
, const char *name
)
665 if (strcmp(name
, "playback_underrun") == 0)
666 return &psc_i2s
->stats
.underrun_count
;
667 if (strcmp(name
, "capture_overrun") == 0)
668 return &psc_i2s
->stats
.overrun_count
;
673 static ssize_t
psc_i2s_stat_show(struct device
*dev
,
674 struct device_attribute
*attr
, char *buf
)
676 struct psc_i2s
*psc_i2s
= dev_get_drvdata(dev
);
679 attrib
= psc_i2s_get_stat_attr(psc_i2s
, attr
->attr
.name
);
683 return sprintf(buf
, "%i\n", *attrib
);
686 static ssize_t
psc_i2s_stat_store(struct device
*dev
,
687 struct device_attribute
*attr
,
691 struct psc_i2s
*psc_i2s
= dev_get_drvdata(dev
);
694 attrib
= psc_i2s_get_stat_attr(psc_i2s
, attr
->attr
.name
);
698 *attrib
= simple_strtoul(buf
, NULL
, 0);
702 DEVICE_ATTR(status
, 0644, psc_i2s_status_show
, NULL
);
703 DEVICE_ATTR(playback_underrun
, 0644, psc_i2s_stat_show
, psc_i2s_stat_store
);
704 DEVICE_ATTR(capture_overrun
, 0644, psc_i2s_stat_show
, psc_i2s_stat_store
);
706 /* ---------------------------------------------------------------------
707 * OF platform bus binding code:
708 * - Probe/remove operations
709 * - OF device match table
711 static int __devinit
psc_i2s_of_probe(struct of_device
*op
,
712 const struct of_device_id
*match
)
715 struct psc_i2s
*psc_i2s
;
717 int size
, psc_id
, irq
, rc
;
721 dev_dbg(&op
->dev
, "probing psc i2s device\n");
724 prop
= of_get_property(op
->node
, "cell-index", &size
);
725 if (!prop
|| size
< sizeof *prop
)
727 psc_id
= be32_to_cpu(*prop
);
729 /* Fetch the registers and IRQ of the PSC */
730 irq
= irq_of_parse_and_map(op
->node
, 0);
731 if (of_address_to_resource(op
->node
, 0, &res
)) {
732 dev_err(&op
->dev
, "Missing reg property\n");
735 regs
= ioremap(res
.start
, 1 + res
.end
- res
.start
);
737 dev_err(&op
->dev
, "Could not map registers\n");
741 /* Allocate and initialize the driver private data */
742 psc_i2s
= kzalloc(sizeof *psc_i2s
, GFP_KERNEL
);
747 spin_lock_init(&psc_i2s
->lock
);
749 psc_i2s
->psc_regs
= regs
;
750 psc_i2s
->fifo_regs
= regs
+ sizeof *psc_i2s
->psc_regs
;
751 psc_i2s
->dev
= &op
->dev
;
752 psc_i2s
->playback
.psc_i2s
= psc_i2s
;
753 psc_i2s
->capture
.psc_i2s
= psc_i2s
;
754 snprintf(psc_i2s
->name
, sizeof psc_i2s
->name
, "PSC%u", psc_id
+1);
756 /* Fill out the CPU DAI structure */
757 memcpy(&psc_i2s
->dai
, &psc_i2s_dai_template
, sizeof psc_i2s
->dai
);
758 psc_i2s
->dai
.private_data
= psc_i2s
;
759 psc_i2s
->dai
.name
= psc_i2s
->name
;
760 psc_i2s
->dai
.id
= psc_id
;
762 /* Find the address of the fifo data registers and setup the
764 fifo
= res
.start
+ offsetof(struct mpc52xx_psc
, buffer
.buffer_32
);
765 psc_i2s
->capture
.bcom_task
=
766 bcom_psc_gen_bd_rx_init(psc_id
, 10, fifo
, 512);
767 psc_i2s
->playback
.bcom_task
=
768 bcom_psc_gen_bd_tx_init(psc_id
, 10, fifo
);
769 if (!psc_i2s
->capture
.bcom_task
||
770 !psc_i2s
->playback
.bcom_task
) {
771 dev_err(&op
->dev
, "Could not allocate bestcomm tasks\n");
777 /* Disable all interrupts and reset the PSC */
778 out_be16(&psc_i2s
->psc_regs
->isr_imr
.imr
, 0);
779 out_8(&psc_i2s
->psc_regs
->command
, 3 << 4); /* reset transmitter */
780 out_8(&psc_i2s
->psc_regs
->command
, 2 << 4); /* reset receiver */
781 out_8(&psc_i2s
->psc_regs
->command
, 1 << 4); /* reset mode */
782 out_8(&psc_i2s
->psc_regs
->command
, 4 << 4); /* reset error */
784 /* Configure the serial interface mode; defaulting to CODEC8 mode */
785 psc_i2s
->sicr
= MPC52xx_PSC_SICR_DTS1
| MPC52xx_PSC_SICR_I2S
|
786 MPC52xx_PSC_SICR_CLKPOL
;
787 if (of_get_property(op
->node
, "fsl,cellslave", NULL
))
788 psc_i2s
->sicr
|= MPC52xx_PSC_SICR_CELLSLAVE
|
789 MPC52xx_PSC_SICR_GENCLK
;
790 out_be32(&psc_i2s
->psc_regs
->sicr
,
791 psc_i2s
->sicr
| MPC52xx_PSC_SICR_SIM_CODEC_8
);
793 /* Check for the codec handle. If it is not present then we
795 if (!of_get_property(op
->node
, "codec-handle", NULL
))
798 /* Set up mode register;
799 * First write: RxRdy (FIFO Alarm) generates rx FIFO irq
800 * Second write: register Normal mode for non loopback
802 out_8(&psc_i2s
->psc_regs
->mode
, 0);
803 out_8(&psc_i2s
->psc_regs
->mode
, 0);
805 /* Set the TX and RX fifo alarm thresholds */
806 out_be16(&psc_i2s
->fifo_regs
->rfalarm
, 0x100);
807 out_8(&psc_i2s
->fifo_regs
->rfcntl
, 0x4);
808 out_be16(&psc_i2s
->fifo_regs
->tfalarm
, 0x100);
809 out_8(&psc_i2s
->fifo_regs
->tfcntl
, 0x7);
811 /* Lookup the IRQ numbers */
812 psc_i2s
->playback
.irq
=
813 bcom_get_task_irq(psc_i2s
->playback
.bcom_task
);
814 psc_i2s
->capture
.irq
=
815 bcom_get_task_irq(psc_i2s
->capture
.bcom_task
);
817 /* Save what we've done so it can be found again later */
818 dev_set_drvdata(&op
->dev
, psc_i2s
);
820 /* Register the SYSFS files */
821 rc
= device_create_file(psc_i2s
->dev
, &dev_attr_status
);
822 rc
= device_create_file(psc_i2s
->dev
, &dev_attr_capture_overrun
);
823 rc
= device_create_file(psc_i2s
->dev
, &dev_attr_playback_underrun
);
825 dev_info(psc_i2s
->dev
, "error creating sysfs files\n");
827 /* Tell the ASoC OF helpers about it */
828 of_snd_soc_register_platform(&psc_i2s_pcm_soc_platform
, op
->node
,
834 static int __devexit
psc_i2s_of_remove(struct of_device
*op
)
836 struct psc_i2s
*psc_i2s
= dev_get_drvdata(&op
->dev
);
838 dev_dbg(&op
->dev
, "psc_i2s_remove()\n");
840 bcom_gen_bd_rx_release(psc_i2s
->capture
.bcom_task
);
841 bcom_gen_bd_tx_release(psc_i2s
->playback
.bcom_task
);
843 iounmap(psc_i2s
->psc_regs
);
844 iounmap(psc_i2s
->fifo_regs
);
846 dev_set_drvdata(&op
->dev
, NULL
);
851 /* Match table for of_platform binding */
852 static struct of_device_id psc_i2s_match
[] __devinitdata
= {
853 { .compatible
= "fsl,mpc5200-psc-i2s", },
856 MODULE_DEVICE_TABLE(of
, psc_i2s_match
);
858 static struct of_platform_driver psc_i2s_driver
= {
859 .match_table
= psc_i2s_match
,
860 .probe
= psc_i2s_of_probe
,
861 .remove
= __devexit_p(psc_i2s_of_remove
),
863 .name
= "mpc5200-psc-i2s",
864 .owner
= THIS_MODULE
,
868 /* ---------------------------------------------------------------------
869 * Module setup and teardown; simply register the of_platform driver
870 * for the PSC in I2S mode.
872 static int __init
psc_i2s_init(void)
874 return of_register_platform_driver(&psc_i2s_driver
);
876 module_init(psc_i2s_init
);
878 static void __exit
psc_i2s_exit(void)
880 of_unregister_platform_driver(&psc_i2s_driver
);
882 module_exit(psc_i2s_exit
);