405 lines
9.8 KiB
C
405 lines
9.8 KiB
C
/*
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* pxa2xx-i2s.c -- ALSA Soc Audio Layer
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*
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* Copyright 2005 Wolfson Microelectronics PLC.
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* Author: Liam Girdwood
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* lrg@slimlogic.co.uk
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/initval.h>
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#include <sound/soc.h>
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#include <sound/pxa2xx-lib.h>
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#include <sound/dmaengine_pcm.h>
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#include <mach/hardware.h>
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#include <mach/audio.h>
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#include "pxa2xx-i2s.h"
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/*
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* I2S Controller Register and Bit Definitions
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*/
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#define SACR0 __REG(0x40400000) /* Global Control Register */
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#define SACR1 __REG(0x40400004) /* Serial Audio I 2 S/MSB-Justified Control Register */
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#define SASR0 __REG(0x4040000C) /* Serial Audio I 2 S/MSB-Justified Interface and FIFO Status Register */
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#define SAIMR __REG(0x40400014) /* Serial Audio Interrupt Mask Register */
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#define SAICR __REG(0x40400018) /* Serial Audio Interrupt Clear Register */
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#define SADIV __REG(0x40400060) /* Audio Clock Divider Register. */
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#define SADR __REG(0x40400080) /* Serial Audio Data Register (TX and RX FIFO access Register). */
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#define SACR0_RFTH(x) ((x) << 12) /* Rx FIFO Interrupt or DMA Trigger Threshold */
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#define SACR0_TFTH(x) ((x) << 8) /* Tx FIFO Interrupt or DMA Trigger Threshold */
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#define SACR0_STRF (1 << 5) /* FIFO Select for EFWR Special Function */
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#define SACR0_EFWR (1 << 4) /* Enable EFWR Function */
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#define SACR0_RST (1 << 3) /* FIFO, i2s Register Reset */
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#define SACR0_BCKD (1 << 2) /* Bit Clock Direction */
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#define SACR0_ENB (1 << 0) /* Enable I2S Link */
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#define SACR1_ENLBF (1 << 5) /* Enable Loopback */
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#define SACR1_DRPL (1 << 4) /* Disable Replaying Function */
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#define SACR1_DREC (1 << 3) /* Disable Recording Function */
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#define SACR1_AMSL (1 << 0) /* Specify Alternate Mode */
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#define SASR0_I2SOFF (1 << 7) /* Controller Status */
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#define SASR0_ROR (1 << 6) /* Rx FIFO Overrun */
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#define SASR0_TUR (1 << 5) /* Tx FIFO Underrun */
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#define SASR0_RFS (1 << 4) /* Rx FIFO Service Request */
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#define SASR0_TFS (1 << 3) /* Tx FIFO Service Request */
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#define SASR0_BSY (1 << 2) /* I2S Busy */
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#define SASR0_RNE (1 << 1) /* Rx FIFO Not Empty */
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#define SASR0_TNF (1 << 0) /* Tx FIFO Not Empty */
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#define SAICR_ROR (1 << 6) /* Clear Rx FIFO Overrun Interrupt */
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#define SAICR_TUR (1 << 5) /* Clear Tx FIFO Underrun Interrupt */
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#define SAIMR_ROR (1 << 6) /* Enable Rx FIFO Overrun Condition Interrupt */
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#define SAIMR_TUR (1 << 5) /* Enable Tx FIFO Underrun Condition Interrupt */
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#define SAIMR_RFS (1 << 4) /* Enable Rx FIFO Service Interrupt */
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#define SAIMR_TFS (1 << 3) /* Enable Tx FIFO Service Interrupt */
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struct pxa_i2s_port {
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u32 sadiv;
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u32 sacr0;
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u32 sacr1;
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u32 saimr;
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int master;
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u32 fmt;
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};
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static struct pxa_i2s_port pxa_i2s;
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static struct clk *clk_i2s;
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static int clk_ena = 0;
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static struct snd_dmaengine_dai_dma_data pxa2xx_i2s_pcm_stereo_out = {
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.addr = __PREG(SADR),
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.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
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.chan_name = "tx",
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.maxburst = 32,
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};
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static struct snd_dmaengine_dai_dma_data pxa2xx_i2s_pcm_stereo_in = {
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.addr = __PREG(SADR),
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.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
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.chan_name = "rx",
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.maxburst = 32,
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};
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static int pxa2xx_i2s_startup(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
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if (IS_ERR(clk_i2s))
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return PTR_ERR(clk_i2s);
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if (!cpu_dai->active)
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SACR0 = 0;
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return 0;
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}
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/* wait for I2S controller to be ready */
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static int pxa_i2s_wait(void)
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{
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int i;
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/* flush the Rx FIFO */
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for (i = 0; i < 16; i++)
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SADR;
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return 0;
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}
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static int pxa2xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
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unsigned int fmt)
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{
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/* interface format */
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switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
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case SND_SOC_DAIFMT_I2S:
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pxa_i2s.fmt = 0;
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break;
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case SND_SOC_DAIFMT_LEFT_J:
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pxa_i2s.fmt = SACR1_AMSL;
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break;
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}
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switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
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case SND_SOC_DAIFMT_CBS_CFS:
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pxa_i2s.master = 1;
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break;
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case SND_SOC_DAIFMT_CBM_CFS:
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pxa_i2s.master = 0;
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break;
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default:
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break;
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}
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return 0;
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}
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static int pxa2xx_i2s_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
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int clk_id, unsigned int freq, int dir)
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{
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if (clk_id != PXA2XX_I2S_SYSCLK)
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return -ENODEV;
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return 0;
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}
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static int pxa2xx_i2s_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *dai)
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{
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struct snd_dmaengine_dai_dma_data *dma_data;
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if (WARN_ON(IS_ERR(clk_i2s)))
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return -EINVAL;
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clk_prepare_enable(clk_i2s);
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clk_ena = 1;
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pxa_i2s_wait();
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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dma_data = &pxa2xx_i2s_pcm_stereo_out;
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else
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dma_data = &pxa2xx_i2s_pcm_stereo_in;
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snd_soc_dai_set_dma_data(dai, substream, dma_data);
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/* is port used by another stream */
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if (!(SACR0 & SACR0_ENB)) {
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SACR0 = 0;
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if (pxa_i2s.master)
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SACR0 |= SACR0_BCKD;
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SACR0 |= SACR0_RFTH(14) | SACR0_TFTH(1);
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SACR1 |= pxa_i2s.fmt;
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}
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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SAIMR |= SAIMR_TFS;
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else
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SAIMR |= SAIMR_RFS;
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switch (params_rate(params)) {
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case 8000:
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SADIV = 0x48;
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break;
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case 11025:
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SADIV = 0x34;
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break;
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case 16000:
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SADIV = 0x24;
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break;
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case 22050:
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SADIV = 0x1a;
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break;
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case 44100:
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SADIV = 0xd;
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break;
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case 48000:
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SADIV = 0xc;
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break;
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case 96000: /* not in manual and possibly slightly inaccurate */
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SADIV = 0x6;
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break;
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}
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return 0;
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}
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static int pxa2xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
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struct snd_soc_dai *dai)
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{
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int ret = 0;
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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SACR1 &= ~SACR1_DRPL;
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else
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SACR1 &= ~SACR1_DREC;
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SACR0 |= SACR0_ENB;
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break;
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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static void pxa2xx_i2s_shutdown(struct snd_pcm_substream *substream,
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struct snd_soc_dai *dai)
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{
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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SACR1 |= SACR1_DRPL;
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SAIMR &= ~SAIMR_TFS;
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} else {
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SACR1 |= SACR1_DREC;
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SAIMR &= ~SAIMR_RFS;
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}
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if ((SACR1 & (SACR1_DREC | SACR1_DRPL)) == (SACR1_DREC | SACR1_DRPL)) {
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SACR0 &= ~SACR0_ENB;
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pxa_i2s_wait();
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if (clk_ena) {
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clk_disable_unprepare(clk_i2s);
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clk_ena = 0;
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}
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}
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}
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#ifdef CONFIG_PM
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static int pxa2xx_i2s_suspend(struct snd_soc_dai *dai)
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{
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/* store registers */
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pxa_i2s.sacr0 = SACR0;
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pxa_i2s.sacr1 = SACR1;
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pxa_i2s.saimr = SAIMR;
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pxa_i2s.sadiv = SADIV;
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/* deactivate link */
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SACR0 &= ~SACR0_ENB;
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pxa_i2s_wait();
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return 0;
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}
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static int pxa2xx_i2s_resume(struct snd_soc_dai *dai)
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{
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pxa_i2s_wait();
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SACR0 = pxa_i2s.sacr0 & ~SACR0_ENB;
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SACR1 = pxa_i2s.sacr1;
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SAIMR = pxa_i2s.saimr;
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SADIV = pxa_i2s.sadiv;
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SACR0 = pxa_i2s.sacr0;
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return 0;
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}
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#else
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#define pxa2xx_i2s_suspend NULL
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#define pxa2xx_i2s_resume NULL
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#endif
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static int pxa2xx_i2s_probe(struct snd_soc_dai *dai)
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{
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clk_i2s = clk_get(dai->dev, "I2SCLK");
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if (IS_ERR(clk_i2s))
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return PTR_ERR(clk_i2s);
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/*
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* PXA Developer's Manual:
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* If SACR0[ENB] is toggled in the middle of a normal operation,
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* the SACR0[RST] bit must also be set and cleared to reset all
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* I2S controller registers.
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*/
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SACR0 = SACR0_RST;
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SACR0 = 0;
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/* Make sure RPL and REC are disabled */
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SACR1 = SACR1_DRPL | SACR1_DREC;
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/* Along with FIFO servicing */
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SAIMR &= ~(SAIMR_RFS | SAIMR_TFS);
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snd_soc_dai_init_dma_data(dai, &pxa2xx_i2s_pcm_stereo_out,
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&pxa2xx_i2s_pcm_stereo_in);
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return 0;
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}
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static int pxa2xx_i2s_remove(struct snd_soc_dai *dai)
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{
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clk_put(clk_i2s);
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clk_i2s = ERR_PTR(-ENOENT);
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return 0;
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}
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#define PXA2XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
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SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
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SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
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static const struct snd_soc_dai_ops pxa_i2s_dai_ops = {
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.startup = pxa2xx_i2s_startup,
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.shutdown = pxa2xx_i2s_shutdown,
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.trigger = pxa2xx_i2s_trigger,
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.hw_params = pxa2xx_i2s_hw_params,
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.set_fmt = pxa2xx_i2s_set_dai_fmt,
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.set_sysclk = pxa2xx_i2s_set_dai_sysclk,
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};
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static struct snd_soc_dai_driver pxa_i2s_dai = {
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.probe = pxa2xx_i2s_probe,
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.remove = pxa2xx_i2s_remove,
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.suspend = pxa2xx_i2s_suspend,
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.resume = pxa2xx_i2s_resume,
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.playback = {
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.channels_min = 2,
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.channels_max = 2,
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.rates = PXA2XX_I2S_RATES,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,},
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.capture = {
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.channels_min = 2,
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.channels_max = 2,
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.rates = PXA2XX_I2S_RATES,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,},
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.ops = &pxa_i2s_dai_ops,
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.symmetric_rates = 1,
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};
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static const struct snd_soc_component_driver pxa_i2s_component = {
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.name = "pxa-i2s",
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.ops = &pxa2xx_pcm_ops,
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.pcm_new = pxa2xx_soc_pcm_new,
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.pcm_free = pxa2xx_pcm_free_dma_buffers,
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};
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static int pxa2xx_i2s_drv_probe(struct platform_device *pdev)
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{
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return devm_snd_soc_register_component(&pdev->dev, &pxa_i2s_component,
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&pxa_i2s_dai, 1);
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}
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static struct platform_driver pxa2xx_i2s_driver = {
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.probe = pxa2xx_i2s_drv_probe,
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.driver = {
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.name = "pxa2xx-i2s",
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},
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};
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static int __init pxa2xx_i2s_init(void)
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{
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clk_i2s = ERR_PTR(-ENOENT);
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return platform_driver_register(&pxa2xx_i2s_driver);
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}
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static void __exit pxa2xx_i2s_exit(void)
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{
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platform_driver_unregister(&pxa2xx_i2s_driver);
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}
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module_init(pxa2xx_i2s_init);
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module_exit(pxa2xx_i2s_exit);
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/* Module information */
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MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
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MODULE_DESCRIPTION("pxa2xx I2S SoC Interface");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:pxa2xx-i2s");
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