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;
168 BUG_ON(IS_ERR(clk_i2s));
170 dai->private_data = dai;
173 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
174 cpu_dai->dma_data = &pxa2xx_i2s_pcm_stereo_out;
176 cpu_dai->dma_data = &pxa2xx_i2s_pcm_stereo_in;
178 /* is port used by another stream */
179 if (!(SACR0 & SACR0_ENB)) {
184 SACR0 |= SACR0_RFTH(14) | SACR0_TFTH(1);
185 SACR1 |= pxa_i2s.fmt;
187 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
192 switch (params_rate(params)) {
211 case 96000: /* not in manual and possibly slightly inaccurate */
219 static int pxa2xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
220 struct snd_soc_dai *dai)
225 case SNDRV_PCM_TRIGGER_START:
226 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
227 SACR1 &= ~SACR1_DRPL;
229 SACR1 &= ~SACR1_DREC;
232 case SNDRV_PCM_TRIGGER_RESUME:
233 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
234 case SNDRV_PCM_TRIGGER_STOP:
235 case SNDRV_PCM_TRIGGER_SUSPEND:
236 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
245 static void pxa2xx_i2s_shutdown(struct snd_pcm_substream *substream,
246 struct snd_soc_dai *dai)
248 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
256 if ((SACR1 & (SACR1_DREC | SACR1_DRPL)) == (SACR1_DREC | SACR1_DRPL)) {
259 if (dai->private_data != NULL) {
260 clk_disable(clk_i2s);
261 dai->private_data = NULL;
267 static int pxa2xx_i2s_suspend(struct snd_soc_dai *dai)
269 /* store registers */
270 pxa_i2s.sacr0 = SACR0;
271 pxa_i2s.sacr1 = SACR1;
272 pxa_i2s.saimr = SAIMR;
273 pxa_i2s.sadiv = SADIV;
275 /* deactivate link */
281 static int pxa2xx_i2s_resume(struct snd_soc_dai *dai)
285 SACR0 = pxa_i2s.sacr0 & ~SACR0_ENB;
286 SACR1 = pxa_i2s.sacr1;
287 SAIMR = pxa_i2s.saimr;
288 SADIV = pxa_i2s.sadiv;
290 SACR0 = pxa_i2s.sacr0;
296 #define pxa2xx_i2s_suspend NULL
297 #define pxa2xx_i2s_resume NULL
300 #define PXA2XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
301 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
302 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
304 static struct snd_soc_dai_ops pxa_i2s_dai_ops = {
305 .startup = pxa2xx_i2s_startup,
306 .shutdown = pxa2xx_i2s_shutdown,
307 .trigger = pxa2xx_i2s_trigger,
308 .hw_params = pxa2xx_i2s_hw_params,
309 .set_fmt = pxa2xx_i2s_set_dai_fmt,
310 .set_sysclk = pxa2xx_i2s_set_dai_sysclk,
313 struct snd_soc_dai pxa_i2s_dai = {
314 .name = "pxa2xx-i2s",
316 .suspend = pxa2xx_i2s_suspend,
317 .resume = pxa2xx_i2s_resume,
321 .rates = PXA2XX_I2S_RATES,
322 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
326 .rates = PXA2XX_I2S_RATES,
327 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
328 .ops = &pxa_i2s_dai_ops,
329 .symmetric_rates = 1,
332 EXPORT_SYMBOL_GPL(pxa_i2s_dai);
334 static int pxa2xx_i2s_probe(struct platform_device *dev)
338 clk_i2s = clk_get(&dev->dev, "I2SCLK");
340 return PTR_ERR(clk_i2s);
342 pxa_i2s_dai.dev = &dev->dev;
343 pxa_i2s_dai.private_data = NULL;
344 ret = snd_soc_register_dai(&pxa_i2s_dai);
349 * PXA Developer's Manual:
350 * If SACR0[ENB] is toggled in the middle of a normal operation,
351 * the SACR0[RST] bit must also be set and cleared to reset all
352 * I2S controller registers.
356 /* Make sure RPL and REC are disabled */
357 SACR1 = SACR1_DRPL | SACR1_DREC;
358 /* Along with FIFO servicing */
359 SAIMR &= ~(SAIMR_RFS | SAIMR_TFS);
364 static int __devexit pxa2xx_i2s_remove(struct platform_device *dev)
366 snd_soc_unregister_dai(&pxa_i2s_dai);
368 clk_i2s = ERR_PTR(-ENOENT);
372 static struct platform_driver pxa2xx_i2s_driver = {
373 .probe = pxa2xx_i2s_probe,
374 .remove = __devexit_p(pxa2xx_i2s_remove),
377 .name = "pxa2xx-i2s",
378 .owner = THIS_MODULE,
382 static int __init pxa2xx_i2s_init(void)
384 clk_i2s = ERR_PTR(-ENOENT);
385 return platform_driver_register(&pxa2xx_i2s_driver);
388 static void __exit pxa2xx_i2s_exit(void)
390 platform_driver_unregister(&pxa2xx_i2s_driver);
393 module_init(pxa2xx_i2s_init);
394 module_exit(pxa2xx_i2s_exit);
396 /* Module information */
397 MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
398 MODULE_DESCRIPTION("pxa2xx I2S SoC Interface");
399 MODULE_LICENSE("GPL");