2 * pxa2xx-i2s.c -- ALSA Soc Audio Layer
4 * Copyright 2005 Wolfson Microelectronics PLC.
5 * Author: Liam Girdwood
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
14 #include <linux/init.h>
15 #include <linux/module.h>
16 #include <linux/device.h>
17 #include <linux/delay.h>
18 #include <linux/clk.h>
19 #include <linux/platform_device.h>
20 #include <sound/core.h>
21 #include <sound/pcm.h>
22 #include <sound/initval.h>
23 #include <sound/soc.h>
24 #include <sound/pxa2xx-lib.h>
26 #include <mach/hardware.h>
28 #include <mach/audio.h>
30 #include "pxa2xx-pcm.h"
31 #include "pxa2xx-i2s.h"
34 * I2S Controller Register and Bit Definitions
36 #define SACR0 __REG(0x40400000) /* Global Control Register */
37 #define SACR1 __REG(0x40400004) /* Serial Audio I 2 S/MSB-Justified Control Register */
38 #define SASR0 __REG(0x4040000C) /* Serial Audio I 2 S/MSB-Justified Interface and FIFO Status Register */
39 #define SAIMR __REG(0x40400014) /* Serial Audio Interrupt Mask Register */
40 #define SAICR __REG(0x40400018) /* Serial Audio Interrupt Clear Register */
41 #define SADIV __REG(0x40400060) /* Audio Clock Divider Register. */
42 #define SADR __REG(0x40400080) /* Serial Audio Data Register (TX and RX FIFO access Register). */
44 #define SACR0_RFTH(x) ((x) << 12) /* Rx FIFO Interrupt or DMA Trigger Threshold */
45 #define SACR0_TFTH(x) ((x) << 8) /* Tx FIFO Interrupt or DMA Trigger Threshold */
46 #define SACR0_STRF (1 << 5) /* FIFO Select for EFWR Special Function */
47 #define SACR0_EFWR (1 << 4) /* Enable EFWR Function */
48 #define SACR0_RST (1 << 3) /* FIFO, i2s Register Reset */
49 #define SACR0_BCKD (1 << 2) /* Bit Clock Direction */
50 #define SACR0_ENB (1 << 0) /* Enable I2S Link */
51 #define SACR1_ENLBF (1 << 5) /* Enable Loopback */
52 #define SACR1_DRPL (1 << 4) /* Disable Replaying Function */
53 #define SACR1_DREC (1 << 3) /* Disable Recording Function */
54 #define SACR1_AMSL (1 << 0) /* Specify Alternate Mode */
56 #define SASR0_I2SOFF (1 << 7) /* Controller Status */
57 #define SASR0_ROR (1 << 6) /* Rx FIFO Overrun */
58 #define SASR0_TUR (1 << 5) /* Tx FIFO Underrun */
59 #define SASR0_RFS (1 << 4) /* Rx FIFO Service Request */
60 #define SASR0_TFS (1 << 3) /* Tx FIFO Service Request */
61 #define SASR0_BSY (1 << 2) /* I2S Busy */
62 #define SASR0_RNE (1 << 1) /* Rx FIFO Not Empty */
63 #define SASR0_TNF (1 << 0) /* Tx FIFO Not Empty */
65 #define SAICR_ROR (1 << 6) /* Clear Rx FIFO Overrun Interrupt */
66 #define SAICR_TUR (1 << 5) /* Clear Tx FIFO Underrun Interrupt */
68 #define SAIMR_ROR (1 << 6) /* Enable Rx FIFO Overrun Condition Interrupt */
69 #define SAIMR_TUR (1 << 5) /* Enable Tx FIFO Underrun Condition Interrupt */
70 #define SAIMR_RFS (1 << 4) /* Enable Rx FIFO Service Interrupt */
71 #define SAIMR_TFS (1 << 3) /* Enable Tx FIFO Service Interrupt */
81 static struct pxa_i2s_port pxa_i2s;
82 static struct clk *clk_i2s;
84 static struct pxa2xx_pcm_dma_params pxa2xx_i2s_pcm_stereo_out = {
85 .name = "I2S PCM Stereo out",
86 .dev_addr = __PREG(SADR),
88 .dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG |
89 DCMD_BURST32 | DCMD_WIDTH4,
92 static struct pxa2xx_pcm_dma_params pxa2xx_i2s_pcm_stereo_in = {
93 .name = "I2S PCM Stereo in",
94 .dev_addr = __PREG(SADR),
96 .dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC |
97 DCMD_BURST32 | DCMD_WIDTH4,
100 static int pxa2xx_i2s_startup(struct snd_pcm_substream *substream,
101 struct snd_soc_dai *dai)
103 struct snd_soc_pcm_runtime *rtd = substream->private_data;
104 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
107 return PTR_ERR(clk_i2s);
109 if (!cpu_dai->active)
115 /* wait for I2S controller to be ready */
116 static int pxa_i2s_wait(void)
120 /* flush the Rx FIFO */
121 for(i = 0; i < 16; i++)
126 static int pxa2xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
129 /* interface format */
130 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
131 case SND_SOC_DAIFMT_I2S:
134 case SND_SOC_DAIFMT_LEFT_J:
135 pxa_i2s.fmt = SACR1_AMSL;
139 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
140 case SND_SOC_DAIFMT_CBS_CFS:
143 case SND_SOC_DAIFMT_CBM_CFS:
152 static int pxa2xx_i2s_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
153 int clk_id, unsigned int freq, int dir)
155 if (clk_id != PXA2XX_I2S_SYSCLK)
161 static int pxa2xx_i2s_hw_params(struct snd_pcm_substream *substream,
162 struct snd_pcm_hw_params *params,
163 struct snd_soc_dai *dai)
165 struct snd_soc_pcm_runtime *rtd = substream->private_data;
166 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
167 struct pxa2xx_pcm_dma_params *dma_data;
169 BUG_ON(IS_ERR(clk_i2s));
171 dai->private_data = dai;
174 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
175 dma_data = &pxa2xx_i2s_pcm_stereo_out;
177 dma_data = &pxa2xx_i2s_pcm_stereo_in;
179 snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
181 /* is port used by another stream */
182 if (!(SACR0 & SACR0_ENB)) {
187 SACR0 |= SACR0_RFTH(14) | SACR0_TFTH(1);
188 SACR1 |= pxa_i2s.fmt;
190 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
195 switch (params_rate(params)) {
214 case 96000: /* not in manual and possibly slightly inaccurate */
222 static int pxa2xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
223 struct snd_soc_dai *dai)
228 case SNDRV_PCM_TRIGGER_START:
229 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
230 SACR1 &= ~SACR1_DRPL;
232 SACR1 &= ~SACR1_DREC;
235 case SNDRV_PCM_TRIGGER_RESUME:
236 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
237 case SNDRV_PCM_TRIGGER_STOP:
238 case SNDRV_PCM_TRIGGER_SUSPEND:
239 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
248 static void pxa2xx_i2s_shutdown(struct snd_pcm_substream *substream,
249 struct snd_soc_dai *dai)
251 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
259 if ((SACR1 & (SACR1_DREC | SACR1_DRPL)) == (SACR1_DREC | SACR1_DRPL)) {
262 if (dai->private_data != NULL) {
263 clk_disable(clk_i2s);
264 dai->private_data = NULL;
270 static int pxa2xx_i2s_suspend(struct snd_soc_dai *dai)
272 /* store registers */
273 pxa_i2s.sacr0 = SACR0;
274 pxa_i2s.sacr1 = SACR1;
275 pxa_i2s.saimr = SAIMR;
276 pxa_i2s.sadiv = SADIV;
278 /* deactivate link */
284 static int pxa2xx_i2s_resume(struct snd_soc_dai *dai)
288 SACR0 = pxa_i2s.sacr0 & ~SACR0_ENB;
289 SACR1 = pxa_i2s.sacr1;
290 SAIMR = pxa_i2s.saimr;
291 SADIV = pxa_i2s.sadiv;
293 SACR0 = pxa_i2s.sacr0;
299 #define pxa2xx_i2s_suspend NULL
300 #define pxa2xx_i2s_resume NULL
303 #define PXA2XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
304 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
305 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
307 static struct snd_soc_dai_ops pxa_i2s_dai_ops = {
308 .startup = pxa2xx_i2s_startup,
309 .shutdown = pxa2xx_i2s_shutdown,
310 .trigger = pxa2xx_i2s_trigger,
311 .hw_params = pxa2xx_i2s_hw_params,
312 .set_fmt = pxa2xx_i2s_set_dai_fmt,
313 .set_sysclk = pxa2xx_i2s_set_dai_sysclk,
316 struct snd_soc_dai pxa_i2s_dai = {
317 .name = "pxa2xx-i2s",
319 .suspend = pxa2xx_i2s_suspend,
320 .resume = pxa2xx_i2s_resume,
324 .rates = PXA2XX_I2S_RATES,
325 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
329 .rates = PXA2XX_I2S_RATES,
330 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
331 .ops = &pxa_i2s_dai_ops,
332 .symmetric_rates = 1,
335 EXPORT_SYMBOL_GPL(pxa_i2s_dai);
337 static int pxa2xx_i2s_probe(struct platform_device *dev)
341 clk_i2s = clk_get(&dev->dev, "I2SCLK");
343 return PTR_ERR(clk_i2s);
345 pxa_i2s_dai.dev = &dev->dev;
346 pxa_i2s_dai.private_data = NULL;
347 ret = snd_soc_register_dai(&pxa_i2s_dai);
352 * PXA Developer's Manual:
353 * If SACR0[ENB] is toggled in the middle of a normal operation,
354 * the SACR0[RST] bit must also be set and cleared to reset all
355 * I2S controller registers.
359 /* Make sure RPL and REC are disabled */
360 SACR1 = SACR1_DRPL | SACR1_DREC;
361 /* Along with FIFO servicing */
362 SAIMR &= ~(SAIMR_RFS | SAIMR_TFS);
367 static int __devexit pxa2xx_i2s_remove(struct platform_device *dev)
369 snd_soc_unregister_dai(&pxa_i2s_dai);
371 clk_i2s = ERR_PTR(-ENOENT);
375 static struct platform_driver pxa2xx_i2s_driver = {
376 .probe = pxa2xx_i2s_probe,
377 .remove = __devexit_p(pxa2xx_i2s_remove),
380 .name = "pxa2xx-i2s",
381 .owner = THIS_MODULE,
385 static int __init pxa2xx_i2s_init(void)
387 clk_i2s = ERR_PTR(-ENOENT);
388 return platform_driver_register(&pxa2xx_i2s_driver);
391 static void __exit pxa2xx_i2s_exit(void)
393 platform_driver_unregister(&pxa2xx_i2s_driver);
396 module_init(pxa2xx_i2s_init);
397 module_exit(pxa2xx_i2s_exit);
399 /* Module information */
400 MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
401 MODULE_DESCRIPTION("pxa2xx I2S SoC Interface");
402 MODULE_LICENSE("GPL");