ALSA: ASoC: Blackfin: update SPORT0 port selector (v2)
[linux-2.6.git] / sound / soc / fsl / mpc5200_psc_i2s.c
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
28 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
29 MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
30 MODULE_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  */
61 struct 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  */
87 struct 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  */
111 static 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  */
142 static 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 */
159 static 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  */
190 static 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
222 static 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
259 static 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  */
271 static 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  */
386 static 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  */
428 static 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  */
448 static 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  */
466 static 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
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,
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
518 static 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
537 static 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
554 static snd_pcm_uframes_t
555 psc_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
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,
577 };
578
579 static u64 psc_i2s_pcm_dmamask = 0xffffffff;
580 static 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
619 static 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
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,
642 };
643
644 /* ---------------------------------------------------------------------
645  * Sysfs attributes for debugging
646  */
647
648 static 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
663 static 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
673 static 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
686 static 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
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);
705
706 /* ---------------------------------------------------------------------
707  * OF platform bus binding code:
708  * - Probe/remove operations
709  * - OF device match table
710  */
711 static 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
834 static 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 */
852 static struct of_device_id psc_i2s_match[] __devinitdata = {
853         { .compatible = "fsl,mpc5200-psc-i2s", },
854         {}
855 };
856 MODULE_DEVICE_TABLE(of, psc_i2s_match);
857
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),
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  */
872 static int __init psc_i2s_init(void)
873 {
874         return of_register_platform_driver(&psc_i2s_driver);
875 }
876 module_init(psc_i2s_init);
877
878 static void __exit psc_i2s_exit(void)
879 {
880         of_unregister_platform_driver(&psc_i2s_driver);
881 }
882 module_exit(psc_i2s_exit);
883
884