aboutsummaryrefslogtreecommitdiffstats
path: root/sound/soc/fsl
diff options
context:
space:
mode:
authorGrant Likely <grant.likely@secretlab.ca>2008-07-29 06:42:30 -0400
committerJaroslav Kysela <perex@perex.cz>2008-07-29 15:32:23 -0400
commitdc641378b5ee220aa29ed8b8f51b7af9a19a7719 (patch)
tree222b803e344396e48ae2a97115472064cd50c76f /sound/soc/fsl
parentb78ddb10704a7f930e5e631de8227c78a6676a1b (diff)
ALSA: ASoC: Add mpc5200-psc I2S driver
This is an I2S bus driver for the MPC5200 PSC device. It depends on the soc-of helper functions to match a PSC device with a codec based on data in the device tree. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Diffstat (limited to 'sound/soc/fsl')
-rw-r--r--sound/soc/fsl/Kconfig7
-rw-r--r--sound/soc/fsl/Makefile2
-rw-r--r--sound/soc/fsl/mpc5200_psc_i2s.c884
3 files changed, 893 insertions, 0 deletions
diff --git a/sound/soc/fsl/Kconfig b/sound/soc/fsl/Kconfig
index 398f00208678..bba9546ba5f5 100644
--- a/sound/soc/fsl/Kconfig
+++ b/sound/soc/fsl/Kconfig
@@ -17,3 +17,10 @@ config SND_SOC_MPC8610_HPCD
17 default y if MPC8610_HPCD 17 default y if MPC8610_HPCD
18 help 18 help
19 Say Y if you want to enable audio on the Freescale MPC8610 HPCD. 19 Say Y if you want to enable audio on the Freescale MPC8610 HPCD.
20
21config SND_SOC_MPC5200_I2S
22 tristate "Freescale MPC5200 PSC in I2S mode driver"
23 select SND_SOC_OF_SIMPLE
24 depends on SND_SOC && PPC_MPC52xx
25 help
26 Say Y here to support the MPC5200 PSCs in I2S mode.
diff --git a/sound/soc/fsl/Makefile b/sound/soc/fsl/Makefile
index aa2100b41146..035da4afec34 100644
--- a/sound/soc/fsl/Makefile
+++ b/sound/soc/fsl/Makefile
@@ -7,3 +7,5 @@ obj-$(CONFIG_SND_SOC_MPC8610_HPCD) += mpc8610_hpcd.o
7# MPC8610 Platform Support 7# MPC8610 Platform Support
8obj-$(CONFIG_SND_SOC_MPC8610) += fsl_ssi.o fsl_dma.o 8obj-$(CONFIG_SND_SOC_MPC8610) += fsl_ssi.o fsl_dma.o
9 9
10obj-$(CONFIG_SND_SOC_MPC5200_I2S) += mpc5200_psc_i2s.o
11
diff --git a/sound/soc/fsl/mpc5200_psc_i2s.c b/sound/soc/fsl/mpc5200_psc_i2s.c
new file mode 100644
index 000000000000..86923299bc10
--- /dev/null
+++ b/sound/soc/fsl/mpc5200_psc_i2s.c
@@ -0,0 +1,884 @@
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 */
190static int psc_i2s_startup(struct snd_pcm_substream *substream)
191{
192 struct snd_soc_pcm_runtime *rtd = substream->private_data;
193 struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
194 int rc;
195
196 dev_dbg(psc_i2s->dev, "psc_i2s_startup(substream=%p)\n", substream);
197
198 if (!psc_i2s->playback.active &&
199 !psc_i2s->capture.active) {
200 /* Setup the IRQs */
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);
209 if (rc) {
210 free_irq(psc_i2s->irq, psc_i2s);
211 free_irq(psc_i2s->capture.irq,
212 &psc_i2s->capture);
213 free_irq(psc_i2s->playback.irq,
214 &psc_i2s->playback);
215 return -ENODEV;
216 }
217 }
218
219 return 0;
220}
221
222static int psc_i2s_hw_params(struct snd_pcm_substream *substream,
223 struct snd_pcm_hw_params *params)
224{
225 struct snd_soc_pcm_runtime *rtd = substream->private_data;
226 struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
227 u32 mode;
228
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));
234
235 switch (params_format(params)) {
236 case SNDRV_PCM_FORMAT_S8:
237 mode = MPC52xx_PSC_SICR_SIM_CODEC_8;
238 break;
239 case SNDRV_PCM_FORMAT_S16_BE:
240 mode = MPC52xx_PSC_SICR_SIM_CODEC_16;
241 break;
242 case SNDRV_PCM_FORMAT_S24_BE:
243 mode = MPC52xx_PSC_SICR_SIM_CODEC_24;
244 break;
245 case SNDRV_PCM_FORMAT_S32_BE:
246 mode = MPC52xx_PSC_SICR_SIM_CODEC_32;
247 break;
248 default:
249 dev_dbg(psc_i2s->dev, "invalid format\n");
250 return -EINVAL;
251 }
252 out_be32(&psc_i2s->psc_regs->sicr, psc_i2s->sicr | mode);
253
254 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
255
256 return 0;
257}
258
259static int psc_i2s_hw_free(struct snd_pcm_substream *substream)
260{
261 snd_pcm_set_runtime_buffer(substream, NULL);
262 return 0;
263}
264
265/**
266 * psc_i2s_trigger: start and stop the DMA transfer.
267 *
268 * This function is called by ALSA to start, stop, pause, and resume the DMA
269 * transfer of data.
270 */
271static int psc_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
272{
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;
278 u16 imr;
279 u8 psc_cmd;
280 long flags;
281
282 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
283 s = &psc_i2s->capture;
284 else
285 s = &psc_i2s->playback;
286
287 dev_dbg(psc_i2s->dev, "psc_i2s_trigger(substream=%p, cmd=%i)"
288 " stream_id=%i\n",
289 substream, cmd, substream->pstr->stream);
290
291 switch (cmd) {
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;
300 s->active = 1;
301
302 /* First; reset everything */
303 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
304 out_8(&regs->command, MPC52xx_PSC_RST_RX);
305 out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
306 } else {
307 out_8(&regs->command, MPC52xx_PSC_RST_TX);
308 out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
309 }
310
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);
315 else
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);
320
321 /* Due to errata in the i2s mode; need to line up enabling
322 * the transmitter with a transition on the frame sync
323 * line */
324
325 spin_lock_irqsave(&psc_i2s->lock, flags);
326 /* first make sure it is low */
327 while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) != 0)
328 ;
329 /* then wait for the transition to high */
330 while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) == 0)
331 ;
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(&regs->command, psc_cmd);
339 spin_unlock_irqrestore(&psc_i2s->lock, flags);
340
341 break;
342
343 case SNDRV_PCM_TRIGGER_STOP:
344 /* Turn off the PSC */
345 s->active = 0;
346 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
347 if (!psc_i2s->playback.active) {
348 out_8(&regs->command, 2 << 4); /* reset rx */
349 out_8(&regs->command, 3 << 4); /* reset tx */
350 out_8(&regs->command, 4 << 4); /* reset err */
351 }
352 } else {
353 out_8(&regs->command, 3 << 4); /* reset tx */
354 out_8(&regs->command, 4 << 4); /* reset err */
355 if (!psc_i2s->capture.active)
356 out_8(&regs->command, 2 << 4); /* reset rx */
357 }
358
359 bcom_disable(s->bcom_task);
360 while (!bcom_queue_empty(s->bcom_task))
361 bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
362
363 break;
364
365 default:
366 dev_dbg(psc_i2s->dev, "invalid command\n");
367 return -EINVAL;
368 }
369
370 /* Update interrupt enable settings */
371 imr = 0;
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(&regs->isr_imr.imr, imr);
377
378 return 0;
379}
380
381/**
382 * psc_i2s_shutdown: shutdown the data transfer on a stream
383 *
384 * Shutdown the PSC if there are no other substreams open.
385 */
386static void psc_i2s_shutdown(struct snd_pcm_substream *substream)
387{
388 struct snd_soc_pcm_runtime *rtd = substream->private_data;
389 struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
390
391 dev_dbg(psc_i2s->dev, "psc_i2s_shutdown(substream=%p)\n", substream);
392
393 /*
394 * If this is the last active substream, disable the PSC and release
395 * the IRQ.
396 */
397 if (!psc_i2s->playback.active &&
398 !psc_i2s->capture.active) {
399
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 */
406
407 /* Release irqs */
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);
411 }
412}
413
414/**
415 * psc_i2s_set_sysclk: set the clock frequency and direction
416 *
417 * This function is called by the machine driver to tell us what the clock
418 * frequency and direction are.
419 *
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.
423 *
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)
427 */
428static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
429 int clk_id, unsigned int freq, int dir)
430{
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",
433 cpu_dai, dir);
434 return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL;
435}
436
437/**
438 * psc_i2s_set_fmt: set the serial format.
439 *
440 * This function is called by the machine driver to tell us what serial
441 * format to use.
442 *
443 * This driver only supports I2S mode. Return an error if the format is
444 * not SND_SOC_DAIFMT_I2S.
445 *
446 * @format: one of SND_SOC_DAIFMT_xxx
447 */
448static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format)
449{
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",
452 cpu_dai, format);
453 return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL;
454}
455
456/* ---------------------------------------------------------------------
457 * ALSA SoC Bindings
458 *
459 * - Digital Audio Interface (DAI) template
460 * - create/destroy dai hooks
461 */
462
463/**
464 * psc_i2s_dai_template: template CPU Digital Audio Interface
465 */
466static struct snd_soc_dai psc_i2s_dai_template = {
467 .type = SND_SOC_DAI_I2S,
468 .playback = {
469 .channels_min = 2,
470 .channels_max = 2,
471 .rates = PSC_I2S_RATES,
472 .formats = PSC_I2S_FORMATS,
473 },
474 .capture = {
475 .channels_min = 2,
476 .channels_max = 2,
477 .rates = PSC_I2S_RATES,
478 .formats = PSC_I2S_FORMATS,
479 },
480 .ops = {
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,
486 },
487 .dai_ops = {
488 .set_sysclk = psc_i2s_set_sysclk,
489 .set_fmt = psc_i2s_set_fmt,
490 },
491};
492
493/* ---------------------------------------------------------------------
494 * The PSC I2S 'ASoC platform' driver
495 *
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
499 */
500
501static 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,
506 .rate_min = 8000,
507 .rate_max = 48000,
508 .channels_min = 2,
509 .channels_max = 2,
510 .period_bytes_max = 1024 * 1024,
511 .period_bytes_min = 32,
512 .periods_min = 2,
513 .periods_max = 256,
514 .buffer_bytes_max = 2 * 1024 * 1024,
515 .fifo_size = 0,
516};
517
518static int psc_i2s_pcm_open(struct snd_pcm_substream *substream)
519{
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;
523
524 dev_dbg(psc_i2s->dev, "psc_i2s_pcm_open(substream=%p)\n", substream);
525
526 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
527 s = &psc_i2s->capture;
528 else
529 s = &psc_i2s->playback;
530
531 snd_soc_set_runtime_hwparams(substream, &psc_i2s_pcm_hardware);
532
533 s->stream = substream;
534 return 0;
535}
536
537static int psc_i2s_pcm_close(struct snd_pcm_substream *substream)
538{
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;
542
543 dev_dbg(psc_i2s->dev, "psc_i2s_pcm_close(substream=%p)\n", substream);
544
545 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
546 s = &psc_i2s->capture;
547 else
548 s = &psc_i2s->playback;
549
550 s->stream = NULL;
551 return 0;
552}
553
554static snd_pcm_uframes_t
555psc_i2s_pcm_pointer(struct snd_pcm_substream *substream)
556{
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;
560 dma_addr_t count;
561
562 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
563 s = &psc_i2s->capture;
564 else
565 s = &psc_i2s->playback;
566
567 count = s->period_current_pt - s->period_start;
568
569 return bytes_to_frames(substream->runtime, count);
570}
571
572static 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,
577};
578
579static u64 psc_i2s_pcm_dmamask = 0xffffffff;
580static int psc_i2s_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
581 struct snd_pcm *pcm)
582{
583 struct snd_soc_pcm_runtime *rtd = pcm->private_data;
584 size_t size = psc_i2s_pcm_hardware.buffer_bytes_max;
585 int rc = 0;
586
587 dev_dbg(rtd->socdev->dev, "psc_i2s_pcm_new(card=%p, dai=%p, pcm=%p)\n",
588 card, dai, pcm);
589
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;
594
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);
598 if (rc)
599 goto playback_alloc_err;
600 }
601
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);
605 if (rc)
606 goto capture_alloc_err;
607 }
608
609 return 0;
610
611 capture_alloc_err:
612 if (pcm->streams[0].substream)
613 snd_dma_free_pages(&pcm->streams[0].substream->dma_buffer);
614 playback_alloc_err:
615 dev_err(card->dev, "Cannot allocate buffer(s)\n");
616 return -ENOMEM;
617}
618
619static void psc_i2s_pcm_free(struct snd_pcm *pcm)
620{
621 struct snd_soc_pcm_runtime *rtd = pcm->private_data;
622 struct snd_pcm_substream *substream;
623 int stream;
624
625 dev_dbg(rtd->socdev->dev, "psc_i2s_pcm_free(pcm=%p)\n", pcm);
626
627 for (stream = 0; stream < 2; stream++) {
628 substream = pcm->streams[stream].substream;
629 if (substream) {
630 snd_dma_free_pages(&substream->dma_buffer);
631 substream->dma_buffer.area = NULL;
632 substream->dma_buffer.addr = 0;
633 }
634 }
635}
636
637struct 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,
642};
643
644/* ---------------------------------------------------------------------
645 * Sysfs attributes for debugging
646 */
647
648static ssize_t psc_i2s_status_show(struct device *dev,
649 struct device_attribute *attr, char *buf)
650{
651 struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
652
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));
661}
662
663static int *psc_i2s_get_stat_attr(struct psc_i2s *psc_i2s, const char *name)
664{
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;
669
670 return NULL;
671}
672
673static ssize_t psc_i2s_stat_show(struct device *dev,
674 struct device_attribute *attr, char *buf)
675{
676 struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
677 int *attrib;
678
679 attrib = psc_i2s_get_stat_attr(psc_i2s, attr->attr.name);
680 if (!attrib)
681 return 0;
682
683 return sprintf(buf, "%i\n", *attrib);
684}
685
686static ssize_t psc_i2s_stat_store(struct device *dev,
687 struct device_attribute *attr,
688 const char *buf,
689 size_t count)
690{
691 struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
692 int *attrib;
693
694 attrib = psc_i2s_get_stat_attr(psc_i2s, attr->attr.name);
695 if (!attrib)
696 return 0;
697
698 *attrib = simple_strtoul(buf, NULL, 0);
699 return count;
700}
701
702DEVICE_ATTR(status, 0644, psc_i2s_status_show, NULL);
703DEVICE_ATTR(playback_underrun, 0644, psc_i2s_stat_show, psc_i2s_stat_store);
704DEVICE_ATTR(capture_overrun, 0644, psc_i2s_stat_show, psc_i2s_stat_store);
705
706/* ---------------------------------------------------------------------
707 * OF platform bus binding code:
708 * - Probe/remove operations
709 * - OF device match table
710 */
711static int __devinit psc_i2s_of_probe(struct of_device *op,
712 const struct of_device_id *match)
713{
714 phys_addr_t fifo;
715 struct psc_i2s *psc_i2s;
716 struct resource res;
717 int size, psc_id, irq, rc;
718 const __be32 *prop;
719 void __iomem *regs;
720
721 dev_dbg(&op->dev, "probing psc i2s device\n");
722
723 /* Get the PSC ID */
724 prop = of_get_property(op->node, "cell-index", &size);
725 if (!prop || size < sizeof *prop)
726 return -ENODEV;
727 psc_id = be32_to_cpu(*prop);
728
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");
733 return -ENODEV;
734 }
735 regs = ioremap(res.start, 1 + res.end - res.start);
736 if (!regs) {
737 dev_err(&op->dev, "Could not map registers\n");
738 return -ENODEV;
739 }
740
741 /* Allocate and initialize the driver private data */
742 psc_i2s = kzalloc(sizeof *psc_i2s, GFP_KERNEL);
743 if (!psc_i2s) {
744 iounmap(regs);
745 return -ENOMEM;
746 }
747 spin_lock_init(&psc_i2s->lock);
748 psc_i2s->irq = irq;
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);
755
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;
761
762 /* Find the address of the fifo data registers and setup the
763 * DMA tasks */
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");
772 iounmap(regs);
773 kfree(psc_i2s);
774 return -ENODEV;
775 }
776
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 */
783
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);
792
793 /* Check for the codec handle. If it is not present then we
794 * are done */
795 if (!of_get_property(op->node, "codec-handle", NULL))
796 return 0;
797
798 /* Set up mode register;
799 * First write: RxRdy (FIFO Alarm) generates rx FIFO irq
800 * Second write: register Normal mode for non loopback
801 */
802 out_8(&psc_i2s->psc_regs->mode, 0);
803 out_8(&psc_i2s->psc_regs->mode, 0);
804
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);
810
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);
816
817 /* Save what we've done so it can be found again later */
818 dev_set_drvdata(&op->dev, psc_i2s);
819
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);
824 if (rc)
825 dev_info(psc_i2s->dev, "error creating sysfs files\n");
826
827 /* Tell the ASoC OF helpers about it */
828 of_snd_soc_register_platform(&psc_i2s_pcm_soc_platform, op->node,
829 &psc_i2s->dai);
830
831 return 0;
832}
833
834static int __devexit psc_i2s_of_remove(struct of_device *op)
835{
836 struct psc_i2s *psc_i2s = dev_get_drvdata(&op->dev);
837
838 dev_dbg(&op->dev, "psc_i2s_remove()\n");
839
840 bcom_gen_bd_rx_release(psc_i2s->capture.bcom_task);
841 bcom_gen_bd_tx_release(psc_i2s->playback.bcom_task);
842
843 iounmap(psc_i2s->psc_regs);
844 iounmap(psc_i2s->fifo_regs);
845 kfree(psc_i2s);
846 dev_set_drvdata(&op->dev, NULL);
847
848 return 0;
849}
850
851/* Match table for of_platform binding */
852static struct of_device_id psc_i2s_match[] __devinitdata = {
853 { .compatible = "fsl,mpc5200-psc-i2s", },
854 {}
855};
856MODULE_DEVICE_TABLE(of, psc_i2s_match);
857
858static 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),
862 .driver = {
863 .name = "mpc5200-psc-i2s",
864 .owner = THIS_MODULE,
865 },
866};
867
868/* ---------------------------------------------------------------------
869 * Module setup and teardown; simply register the of_platform driver
870 * for the PSC in I2S mode.
871 */
872static int __init psc_i2s_init(void)
873{
874 return of_register_platform_driver(&psc_i2s_driver);
875}
876module_init(psc_i2s_init);
877
878static void __exit psc_i2s_exit(void)
879{
880 of_unregister_platform_driver(&psc_i2s_driver);
881}
882module_exit(psc_i2s_exit);
883
884