1 /*
2 * imx-ssi.c -- ALSA Soc Audio Layer
3 *
4 * Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
5 *
6 * This code is based on code copyrighted by Freescale,
7 * Liam Girdwood, Javier Martin and probably others.
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 *
15 * The i.MX SSI core has some nasty limitations in AC97 mode. While most
16 * sane processor vendors have a FIFO per AC97 slot, the i.MX has only
17 * one FIFO which combines all valid receive slots. We cannot even select
18 * which slots we want to receive. The WM9712 with which this driver
19 * was developed with always sends GPIO status data in slot 12 which
20 * we receive in our (PCM-) data stream. The only chance we have is to
21 * manually skip this data in the FIQ handler. With sampling rates different
22 * from 48000Hz not every frame has valid receive data, so the ratio
23 * between pcm data and GPIO status data changes. Our FIQ handler is not
24 * able to handle this, hence this driver only works with 48000Hz sampling
25 * rate.
26 * Reading and writing AC97 registers is another challenge. The core
27 * provides us status bits when the read register is updated with *another*
28 * value. When we read the same register two times (and the register still
29 * contains the same value) these status bits are not set. We work
30 * around this by not polling these bits but only wait a fixed delay.
31 *
32 */
33
34 #include <linux/clk.h>
35 #include <linux/delay.h>
36 #include <linux/device.h>
37 #include <linux/dma-mapping.h>
38 #include <linux/init.h>
39 #include <linux/interrupt.h>
40 #include <linux/module.h>
41 #include <linux/platform_device.h>
42 #include <linux/slab.h>
43
44 #include <sound/core.h>
45 #include <sound/initval.h>
46 #include <sound/pcm.h>
47 #include <sound/pcm_params.h>
48 #include <sound/soc.h>
49
50 #include <mach/ssi.h>
51 #include <mach/hardware.h>
52
53 #include "imx-ssi.h"
54
55 #define SSI_SACNT_DEFAULT (SSI_SACNT_AC97EN | SSI_SACNT_FV)
56
57 /*
58 * SSI Network Mode or TDM slots configuration.
59 * Should only be called when port is inactive (i.e. SSIEN = 0).
60 */
imx_ssi_set_dai_tdm_slot(struct snd_soc_dai * cpu_dai,unsigned int tx_mask,unsigned int rx_mask,int slots,int slot_width)61 static int imx_ssi_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai,
62 unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width)
63 {
64 struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
65 u32 sccr;
66
67 sccr = readl(ssi->base + SSI_STCCR);
68 sccr &= ~SSI_STCCR_DC_MASK;
69 sccr |= SSI_STCCR_DC(slots - 1);
70 writel(sccr, ssi->base + SSI_STCCR);
71
72 sccr = readl(ssi->base + SSI_SRCCR);
73 sccr &= ~SSI_STCCR_DC_MASK;
74 sccr |= SSI_STCCR_DC(slots - 1);
75 writel(sccr, ssi->base + SSI_SRCCR);
76
77 writel(tx_mask, ssi->base + SSI_STMSK);
78 writel(rx_mask, ssi->base + SSI_SRMSK);
79
80 return 0;
81 }
82
83 /*
84 * SSI DAI format configuration.
85 * Should only be called when port is inactive (i.e. SSIEN = 0).
86 */
imx_ssi_set_dai_fmt(struct snd_soc_dai * cpu_dai,unsigned int fmt)87 static int imx_ssi_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
88 {
89 struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
90 u32 strcr = 0, scr;
91
92 scr = readl(ssi->base + SSI_SCR) & ~(SSI_SCR_SYN | SSI_SCR_NET);
93
94 /* DAI mode */
95 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
96 case SND_SOC_DAIFMT_I2S:
97 /* data on rising edge of bclk, frame low 1clk before data */
98 strcr |= SSI_STCR_TFSI | SSI_STCR_TEFS | SSI_STCR_TXBIT0;
99 scr |= SSI_SCR_NET;
100 if (ssi->flags & IMX_SSI_USE_I2S_SLAVE) {
101 scr &= ~SSI_I2S_MODE_MASK;
102 scr |= SSI_SCR_I2S_MODE_SLAVE;
103 }
104 break;
105 case SND_SOC_DAIFMT_LEFT_J:
106 /* data on rising edge of bclk, frame high with data */
107 strcr |= SSI_STCR_TXBIT0;
108 break;
109 case SND_SOC_DAIFMT_DSP_B:
110 /* data on rising edge of bclk, frame high with data */
111 strcr |= SSI_STCR_TFSL | SSI_STCR_TXBIT0;
112 break;
113 case SND_SOC_DAIFMT_DSP_A:
114 /* data on rising edge of bclk, frame high 1clk before data */
115 strcr |= SSI_STCR_TFSL | SSI_STCR_TXBIT0 | SSI_STCR_TEFS;
116 break;
117 }
118
119 /* DAI clock inversion */
120 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
121 case SND_SOC_DAIFMT_IB_IF:
122 strcr |= SSI_STCR_TFSI;
123 strcr &= ~SSI_STCR_TSCKP;
124 break;
125 case SND_SOC_DAIFMT_IB_NF:
126 strcr &= ~(SSI_STCR_TSCKP | SSI_STCR_TFSI);
127 break;
128 case SND_SOC_DAIFMT_NB_IF:
129 strcr |= SSI_STCR_TFSI | SSI_STCR_TSCKP;
130 break;
131 case SND_SOC_DAIFMT_NB_NF:
132 strcr &= ~SSI_STCR_TFSI;
133 strcr |= SSI_STCR_TSCKP;
134 break;
135 }
136
137 /* DAI clock master masks */
138 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
139 case SND_SOC_DAIFMT_CBM_CFM:
140 break;
141 default:
142 /* Master mode not implemented, needs handling of clocks. */
143 return -EINVAL;
144 }
145
146 strcr |= SSI_STCR_TFEN0;
147
148 if (ssi->flags & IMX_SSI_NET)
149 scr |= SSI_SCR_NET;
150 if (ssi->flags & IMX_SSI_SYN)
151 scr |= SSI_SCR_SYN;
152
153 writel(strcr, ssi->base + SSI_STCR);
154 writel(strcr, ssi->base + SSI_SRCR);
155 writel(scr, ssi->base + SSI_SCR);
156
157 return 0;
158 }
159
160 /*
161 * SSI system clock configuration.
162 * Should only be called when port is inactive (i.e. SSIEN = 0).
163 */
imx_ssi_set_dai_sysclk(struct snd_soc_dai * cpu_dai,int clk_id,unsigned int freq,int dir)164 static int imx_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
165 int clk_id, unsigned int freq, int dir)
166 {
167 struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
168 u32 scr;
169
170 scr = readl(ssi->base + SSI_SCR);
171
172 switch (clk_id) {
173 case IMX_SSP_SYS_CLK:
174 if (dir == SND_SOC_CLOCK_OUT)
175 scr |= SSI_SCR_SYS_CLK_EN;
176 else
177 scr &= ~SSI_SCR_SYS_CLK_EN;
178 break;
179 default:
180 return -EINVAL;
181 }
182
183 writel(scr, ssi->base + SSI_SCR);
184
185 return 0;
186 }
187
188 /*
189 * SSI Clock dividers
190 * Should only be called when port is inactive (i.e. SSIEN = 0).
191 */
imx_ssi_set_dai_clkdiv(struct snd_soc_dai * cpu_dai,int div_id,int div)192 static int imx_ssi_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,
193 int div_id, int div)
194 {
195 struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
196 u32 stccr, srccr;
197
198 stccr = readl(ssi->base + SSI_STCCR);
199 srccr = readl(ssi->base + SSI_SRCCR);
200
201 switch (div_id) {
202 case IMX_SSI_TX_DIV_2:
203 stccr &= ~SSI_STCCR_DIV2;
204 stccr |= div;
205 break;
206 case IMX_SSI_TX_DIV_PSR:
207 stccr &= ~SSI_STCCR_PSR;
208 stccr |= div;
209 break;
210 case IMX_SSI_TX_DIV_PM:
211 stccr &= ~0xff;
212 stccr |= SSI_STCCR_PM(div);
213 break;
214 case IMX_SSI_RX_DIV_2:
215 stccr &= ~SSI_STCCR_DIV2;
216 stccr |= div;
217 break;
218 case IMX_SSI_RX_DIV_PSR:
219 stccr &= ~SSI_STCCR_PSR;
220 stccr |= div;
221 break;
222 case IMX_SSI_RX_DIV_PM:
223 stccr &= ~0xff;
224 stccr |= SSI_STCCR_PM(div);
225 break;
226 default:
227 return -EINVAL;
228 }
229
230 writel(stccr, ssi->base + SSI_STCCR);
231 writel(srccr, ssi->base + SSI_SRCCR);
232
233 return 0;
234 }
235
236 /*
237 * Should only be called when port is inactive (i.e. SSIEN = 0),
238 * although can be called multiple times by upper layers.
239 */
imx_ssi_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * cpu_dai)240 static int imx_ssi_hw_params(struct snd_pcm_substream *substream,
241 struct snd_pcm_hw_params *params,
242 struct snd_soc_dai *cpu_dai)
243 {
244 struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
245 struct imx_pcm_dma_params *dma_data;
246 u32 reg, sccr;
247
248 /* Tx/Rx config */
249 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
250 reg = SSI_STCCR;
251 dma_data = &ssi->dma_params_tx;
252 } else {
253 reg = SSI_SRCCR;
254 dma_data = &ssi->dma_params_rx;
255 }
256
257 if (ssi->flags & IMX_SSI_SYN)
258 reg = SSI_STCCR;
259
260 snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
261
262 sccr = readl(ssi->base + reg) & ~SSI_STCCR_WL_MASK;
263
264 /* DAI data (word) size */
265 switch (params_format(params)) {
266 case SNDRV_PCM_FORMAT_S16_LE:
267 sccr |= SSI_SRCCR_WL(16);
268 break;
269 case SNDRV_PCM_FORMAT_S20_3LE:
270 sccr |= SSI_SRCCR_WL(20);
271 break;
272 case SNDRV_PCM_FORMAT_S24_LE:
273 sccr |= SSI_SRCCR_WL(24);
274 break;
275 }
276
277 writel(sccr, ssi->base + reg);
278
279 return 0;
280 }
281
imx_ssi_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)282 static int imx_ssi_trigger(struct snd_pcm_substream *substream, int cmd,
283 struct snd_soc_dai *dai)
284 {
285 struct imx_ssi *ssi = snd_soc_dai_get_drvdata(dai);
286 unsigned int sier_bits, sier;
287 unsigned int scr;
288
289 scr = readl(ssi->base + SSI_SCR);
290 sier = readl(ssi->base + SSI_SIER);
291
292 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
293 if (ssi->flags & IMX_SSI_DMA)
294 sier_bits = SSI_SIER_TDMAE;
295 else
296 sier_bits = SSI_SIER_TIE | SSI_SIER_TFE0_EN;
297 } else {
298 if (ssi->flags & IMX_SSI_DMA)
299 sier_bits = SSI_SIER_RDMAE;
300 else
301 sier_bits = SSI_SIER_RIE | SSI_SIER_RFF0_EN;
302 }
303
304 switch (cmd) {
305 case SNDRV_PCM_TRIGGER_START:
306 case SNDRV_PCM_TRIGGER_RESUME:
307 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
308 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
309 scr |= SSI_SCR_TE;
310 else
311 scr |= SSI_SCR_RE;
312 sier |= sier_bits;
313
314 if (++ssi->enabled == 1)
315 scr |= SSI_SCR_SSIEN;
316
317 break;
318
319 case SNDRV_PCM_TRIGGER_STOP:
320 case SNDRV_PCM_TRIGGER_SUSPEND:
321 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
322 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
323 scr &= ~SSI_SCR_TE;
324 else
325 scr &= ~SSI_SCR_RE;
326 sier &= ~sier_bits;
327
328 if (--ssi->enabled == 0)
329 scr &= ~SSI_SCR_SSIEN;
330
331 break;
332 default:
333 return -EINVAL;
334 }
335
336 if (!(ssi->flags & IMX_SSI_USE_AC97))
337 /* rx/tx are always enabled to access ac97 registers */
338 writel(scr, ssi->base + SSI_SCR);
339
340 writel(sier, ssi->base + SSI_SIER);
341
342 return 0;
343 }
344
345 static const struct snd_soc_dai_ops imx_ssi_pcm_dai_ops = {
346 .hw_params = imx_ssi_hw_params,
347 .set_fmt = imx_ssi_set_dai_fmt,
348 .set_clkdiv = imx_ssi_set_dai_clkdiv,
349 .set_sysclk = imx_ssi_set_dai_sysclk,
350 .set_tdm_slot = imx_ssi_set_dai_tdm_slot,
351 .trigger = imx_ssi_trigger,
352 };
353
snd_imx_pcm_mmap(struct snd_pcm_substream * substream,struct vm_area_struct * vma)354 int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
355 struct vm_area_struct *vma)
356 {
357 struct snd_pcm_runtime *runtime = substream->runtime;
358 int ret;
359
360 ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
361 runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
362
363 pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
364 runtime->dma_area,
365 runtime->dma_addr,
366 runtime->dma_bytes);
367 return ret;
368 }
369 EXPORT_SYMBOL_GPL(snd_imx_pcm_mmap);
370
imx_pcm_preallocate_dma_buffer(struct snd_pcm * pcm,int stream)371 static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
372 {
373 struct snd_pcm_substream *substream = pcm->streams[stream].substream;
374 struct snd_dma_buffer *buf = &substream->dma_buffer;
375 size_t size = IMX_SSI_DMABUF_SIZE;
376
377 buf->dev.type = SNDRV_DMA_TYPE_DEV;
378 buf->dev.dev = pcm->card->dev;
379 buf->private_data = NULL;
380 buf->area = dma_alloc_writecombine(pcm->card->dev, size,
381 &buf->addr, GFP_KERNEL);
382 if (!buf->area)
383 return -ENOMEM;
384 buf->bytes = size;
385
386 return 0;
387 }
388
389 static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);
390
imx_pcm_new(struct snd_soc_pcm_runtime * rtd)391 int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
392 {
393 struct snd_card *card = rtd->card->snd_card;
394 struct snd_pcm *pcm = rtd->pcm;
395 int ret = 0;
396
397 if (!card->dev->dma_mask)
398 card->dev->dma_mask = &imx_pcm_dmamask;
399 if (!card->dev->coherent_dma_mask)
400 card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
401 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
402 ret = imx_pcm_preallocate_dma_buffer(pcm,
403 SNDRV_PCM_STREAM_PLAYBACK);
404 if (ret)
405 goto out;
406 }
407
408 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
409 ret = imx_pcm_preallocate_dma_buffer(pcm,
410 SNDRV_PCM_STREAM_CAPTURE);
411 if (ret)
412 goto out;
413 }
414
415 out:
416 return ret;
417 }
418 EXPORT_SYMBOL_GPL(imx_pcm_new);
419
imx_pcm_free(struct snd_pcm * pcm)420 void imx_pcm_free(struct snd_pcm *pcm)
421 {
422 struct snd_pcm_substream *substream;
423 struct snd_dma_buffer *buf;
424 int stream;
425
426 for (stream = 0; stream < 2; stream++) {
427 substream = pcm->streams[stream].substream;
428 if (!substream)
429 continue;
430
431 buf = &substream->dma_buffer;
432 if (!buf->area)
433 continue;
434
435 dma_free_writecombine(pcm->card->dev, buf->bytes,
436 buf->area, buf->addr);
437 buf->area = NULL;
438 }
439 }
440 EXPORT_SYMBOL_GPL(imx_pcm_free);
441
imx_ssi_dai_probe(struct snd_soc_dai * dai)442 static int imx_ssi_dai_probe(struct snd_soc_dai *dai)
443 {
444 struct imx_ssi *ssi = dev_get_drvdata(dai->dev);
445 uint32_t val;
446
447 snd_soc_dai_set_drvdata(dai, ssi);
448
449 val = SSI_SFCSR_TFWM0(ssi->dma_params_tx.burstsize) |
450 SSI_SFCSR_RFWM0(ssi->dma_params_rx.burstsize);
451 writel(val, ssi->base + SSI_SFCSR);
452
453 return 0;
454 }
455
456 static struct snd_soc_dai_driver imx_ssi_dai = {
457 .probe = imx_ssi_dai_probe,
458 .playback = {
459 .channels_min = 1,
460 .channels_max = 2,
461 .rates = SNDRV_PCM_RATE_8000_96000,
462 .formats = SNDRV_PCM_FMTBIT_S16_LE,
463 },
464 .capture = {
465 .channels_min = 1,
466 .channels_max = 2,
467 .rates = SNDRV_PCM_RATE_8000_96000,
468 .formats = SNDRV_PCM_FMTBIT_S16_LE,
469 },
470 .ops = &imx_ssi_pcm_dai_ops,
471 };
472
473 static struct snd_soc_dai_driver imx_ac97_dai = {
474 .probe = imx_ssi_dai_probe,
475 .ac97_control = 1,
476 .playback = {
477 .stream_name = "AC97 Playback",
478 .channels_min = 2,
479 .channels_max = 2,
480 .rates = SNDRV_PCM_RATE_48000,
481 .formats = SNDRV_PCM_FMTBIT_S16_LE,
482 },
483 .capture = {
484 .stream_name = "AC97 Capture",
485 .channels_min = 2,
486 .channels_max = 2,
487 .rates = SNDRV_PCM_RATE_48000,
488 .formats = SNDRV_PCM_FMTBIT_S16_LE,
489 },
490 .ops = &imx_ssi_pcm_dai_ops,
491 };
492
setup_channel_to_ac97(struct imx_ssi * imx_ssi)493 static void setup_channel_to_ac97(struct imx_ssi *imx_ssi)
494 {
495 void __iomem *base = imx_ssi->base;
496
497 writel(0x0, base + SSI_SCR);
498 writel(0x0, base + SSI_STCR);
499 writel(0x0, base + SSI_SRCR);
500
501 writel(SSI_SCR_SYN | SSI_SCR_NET, base + SSI_SCR);
502
503 writel(SSI_SFCSR_RFWM0(8) |
504 SSI_SFCSR_TFWM0(8) |
505 SSI_SFCSR_RFWM1(8) |
506 SSI_SFCSR_TFWM1(8), base + SSI_SFCSR);
507
508 writel(SSI_STCCR_WL(16) | SSI_STCCR_DC(12), base + SSI_STCCR);
509 writel(SSI_STCCR_WL(16) | SSI_STCCR_DC(12), base + SSI_SRCCR);
510
511 writel(SSI_SCR_SYN | SSI_SCR_NET | SSI_SCR_SSIEN, base + SSI_SCR);
512 writel(SSI_SOR_WAIT(3), base + SSI_SOR);
513
514 writel(SSI_SCR_SYN | SSI_SCR_NET | SSI_SCR_SSIEN |
515 SSI_SCR_TE | SSI_SCR_RE,
516 base + SSI_SCR);
517
518 writel(SSI_SACNT_DEFAULT, base + SSI_SACNT);
519 writel(0xff, base + SSI_SACCDIS);
520 writel(0x300, base + SSI_SACCEN);
521 }
522
523 static struct imx_ssi *ac97_ssi;
524
imx_ssi_ac97_write(struct snd_ac97 * ac97,unsigned short reg,unsigned short val)525 static void imx_ssi_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
526 unsigned short val)
527 {
528 struct imx_ssi *imx_ssi = ac97_ssi;
529 void __iomem *base = imx_ssi->base;
530 unsigned int lreg;
531 unsigned int lval;
532
533 if (reg > 0x7f)
534 return;
535
536 pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val);
537
538 lreg = reg << 12;
539 writel(lreg, base + SSI_SACADD);
540
541 lval = val << 4;
542 writel(lval , base + SSI_SACDAT);
543
544 writel(SSI_SACNT_DEFAULT | SSI_SACNT_WR, base + SSI_SACNT);
545 udelay(100);
546 }
547
imx_ssi_ac97_read(struct snd_ac97 * ac97,unsigned short reg)548 static unsigned short imx_ssi_ac97_read(struct snd_ac97 *ac97,
549 unsigned short reg)
550 {
551 struct imx_ssi *imx_ssi = ac97_ssi;
552 void __iomem *base = imx_ssi->base;
553
554 unsigned short val = -1;
555 unsigned int lreg;
556
557 lreg = (reg & 0x7f) << 12 ;
558 writel(lreg, base + SSI_SACADD);
559 writel(SSI_SACNT_DEFAULT | SSI_SACNT_RD, base + SSI_SACNT);
560
561 udelay(100);
562
563 val = (readl(base + SSI_SACDAT) >> 4) & 0xffff;
564
565 pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val);
566
567 return val;
568 }
569
imx_ssi_ac97_reset(struct snd_ac97 * ac97)570 static void imx_ssi_ac97_reset(struct snd_ac97 *ac97)
571 {
572 struct imx_ssi *imx_ssi = ac97_ssi;
573
574 if (imx_ssi->ac97_reset)
575 imx_ssi->ac97_reset(ac97);
576 }
577
imx_ssi_ac97_warm_reset(struct snd_ac97 * ac97)578 static void imx_ssi_ac97_warm_reset(struct snd_ac97 *ac97)
579 {
580 struct imx_ssi *imx_ssi = ac97_ssi;
581
582 if (imx_ssi->ac97_warm_reset)
583 imx_ssi->ac97_warm_reset(ac97);
584 }
585
586 struct snd_ac97_bus_ops soc_ac97_ops = {
587 .read = imx_ssi_ac97_read,
588 .write = imx_ssi_ac97_write,
589 .reset = imx_ssi_ac97_reset,
590 .warm_reset = imx_ssi_ac97_warm_reset
591 };
592 EXPORT_SYMBOL_GPL(soc_ac97_ops);
593
imx_ssi_probe(struct platform_device * pdev)594 static int imx_ssi_probe(struct platform_device *pdev)
595 {
596 struct resource *res;
597 struct imx_ssi *ssi;
598 struct imx_ssi_platform_data *pdata = pdev->dev.platform_data;
599 int ret = 0;
600 struct snd_soc_dai_driver *dai;
601
602 ssi = kzalloc(sizeof(*ssi), GFP_KERNEL);
603 if (!ssi)
604 return -ENOMEM;
605 dev_set_drvdata(&pdev->dev, ssi);
606
607 if (pdata) {
608 ssi->ac97_reset = pdata->ac97_reset;
609 ssi->ac97_warm_reset = pdata->ac97_warm_reset;
610 ssi->flags = pdata->flags;
611 }
612
613 ssi->irq = platform_get_irq(pdev, 0);
614
615 ssi->clk = clk_get(&pdev->dev, NULL);
616 if (IS_ERR(ssi->clk)) {
617 ret = PTR_ERR(ssi->clk);
618 dev_err(&pdev->dev, "Cannot get the clock: %d\n",
619 ret);
620 goto failed_clk;
621 }
622 clk_enable(ssi->clk);
623
624 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
625 if (!res) {
626 ret = -ENODEV;
627 goto failed_get_resource;
628 }
629
630 if (!request_mem_region(res->start, resource_size(res), DRV_NAME)) {
631 dev_err(&pdev->dev, "request_mem_region failed\n");
632 ret = -EBUSY;
633 goto failed_get_resource;
634 }
635
636 ssi->base = ioremap(res->start, resource_size(res));
637 if (!ssi->base) {
638 dev_err(&pdev->dev, "ioremap failed\n");
639 ret = -ENODEV;
640 goto failed_ioremap;
641 }
642
643 if (ssi->flags & IMX_SSI_USE_AC97) {
644 if (ac97_ssi) {
645 ret = -EBUSY;
646 goto failed_ac97;
647 }
648 ac97_ssi = ssi;
649 setup_channel_to_ac97(ssi);
650 dai = &imx_ac97_dai;
651 } else
652 dai = &imx_ssi_dai;
653
654 writel(0x0, ssi->base + SSI_SIER);
655
656 ssi->dma_params_rx.dma_addr = res->start + SSI_SRX0;
657 ssi->dma_params_tx.dma_addr = res->start + SSI_STX0;
658
659 ssi->dma_params_tx.burstsize = 4;
660 ssi->dma_params_rx.burstsize = 4;
661
662 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx0");
663 if (res)
664 ssi->dma_params_tx.dma = res->start;
665
666 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx0");
667 if (res)
668 ssi->dma_params_rx.dma = res->start;
669
670 platform_set_drvdata(pdev, ssi);
671
672 ret = snd_soc_register_dai(&pdev->dev, dai);
673 if (ret) {
674 dev_err(&pdev->dev, "register DAI failed\n");
675 goto failed_register;
676 }
677
678 ssi->soc_platform_pdev_fiq = platform_device_alloc("imx-fiq-pcm-audio", pdev->id);
679 if (!ssi->soc_platform_pdev_fiq) {
680 ret = -ENOMEM;
681 goto failed_pdev_fiq_alloc;
682 }
683
684 platform_set_drvdata(ssi->soc_platform_pdev_fiq, ssi);
685 ret = platform_device_add(ssi->soc_platform_pdev_fiq);
686 if (ret) {
687 dev_err(&pdev->dev, "failed to add platform device\n");
688 goto failed_pdev_fiq_add;
689 }
690
691 ssi->soc_platform_pdev = platform_device_alloc("imx-pcm-audio", pdev->id);
692 if (!ssi->soc_platform_pdev) {
693 ret = -ENOMEM;
694 goto failed_pdev_alloc;
695 }
696
697 platform_set_drvdata(ssi->soc_platform_pdev, ssi);
698 ret = platform_device_add(ssi->soc_platform_pdev);
699 if (ret) {
700 dev_err(&pdev->dev, "failed to add platform device\n");
701 goto failed_pdev_add;
702 }
703
704 return 0;
705
706 failed_pdev_add:
707 platform_device_put(ssi->soc_platform_pdev);
708 failed_pdev_alloc:
709 platform_device_del(ssi->soc_platform_pdev_fiq);
710 failed_pdev_fiq_add:
711 platform_device_put(ssi->soc_platform_pdev_fiq);
712 failed_pdev_fiq_alloc:
713 snd_soc_unregister_dai(&pdev->dev);
714 failed_register:
715 failed_ac97:
716 iounmap(ssi->base);
717 failed_ioremap:
718 release_mem_region(res->start, resource_size(res));
719 failed_get_resource:
720 clk_disable(ssi->clk);
721 clk_put(ssi->clk);
722 failed_clk:
723 kfree(ssi);
724
725 return ret;
726 }
727
imx_ssi_remove(struct platform_device * pdev)728 static int __devexit imx_ssi_remove(struct platform_device *pdev)
729 {
730 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
731 struct imx_ssi *ssi = platform_get_drvdata(pdev);
732
733 platform_device_unregister(ssi->soc_platform_pdev);
734 platform_device_unregister(ssi->soc_platform_pdev_fiq);
735
736 snd_soc_unregister_dai(&pdev->dev);
737
738 if (ssi->flags & IMX_SSI_USE_AC97)
739 ac97_ssi = NULL;
740
741 iounmap(ssi->base);
742 release_mem_region(res->start, resource_size(res));
743 clk_disable(ssi->clk);
744 clk_put(ssi->clk);
745 kfree(ssi);
746
747 return 0;
748 }
749
750 static struct platform_driver imx_ssi_driver = {
751 .probe = imx_ssi_probe,
752 .remove = __devexit_p(imx_ssi_remove),
753
754 .driver = {
755 .name = "imx-ssi",
756 .owner = THIS_MODULE,
757 },
758 };
759
760 module_platform_driver(imx_ssi_driver);
761
762 /* Module information */
763 MODULE_AUTHOR("Sascha Hauer, <s.hauer@pengutronix.de>");
764 MODULE_DESCRIPTION("i.MX I2S/ac97 SoC Interface");
765 MODULE_LICENSE("GPL");
766 MODULE_ALIAS("platform:imx-ssi");
767