410 lines
12 KiB
C
410 lines
12 KiB
C
/*
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* ALSA SoC I2S (McBSP) Audio Layer for TI DAVINCI processor
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*
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* Author: Vladimir Barinov, <vbarinov@ru.mvista.com>
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* Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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/io.h>
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#include <linux/clk.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/initval.h>
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#include <sound/soc.h>
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#include "davinci-pcm.h"
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#define DAVINCI_MCBSP_DRR_REG 0x00
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#define DAVINCI_MCBSP_DXR_REG 0x04
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#define DAVINCI_MCBSP_SPCR_REG 0x08
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#define DAVINCI_MCBSP_RCR_REG 0x0c
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#define DAVINCI_MCBSP_XCR_REG 0x10
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#define DAVINCI_MCBSP_SRGR_REG 0x14
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#define DAVINCI_MCBSP_PCR_REG 0x24
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#define DAVINCI_MCBSP_SPCR_RRST (1 << 0)
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#define DAVINCI_MCBSP_SPCR_RINTM(v) ((v) << 4)
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#define DAVINCI_MCBSP_SPCR_XRST (1 << 16)
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#define DAVINCI_MCBSP_SPCR_XINTM(v) ((v) << 20)
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#define DAVINCI_MCBSP_SPCR_GRST (1 << 22)
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#define DAVINCI_MCBSP_SPCR_FRST (1 << 23)
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#define DAVINCI_MCBSP_SPCR_FREE (1 << 25)
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#define DAVINCI_MCBSP_RCR_RWDLEN1(v) ((v) << 5)
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#define DAVINCI_MCBSP_RCR_RFRLEN1(v) ((v) << 8)
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#define DAVINCI_MCBSP_RCR_RDATDLY(v) ((v) << 16)
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#define DAVINCI_MCBSP_RCR_RWDLEN2(v) ((v) << 21)
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#define DAVINCI_MCBSP_XCR_XWDLEN1(v) ((v) << 5)
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#define DAVINCI_MCBSP_XCR_XFRLEN1(v) ((v) << 8)
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#define DAVINCI_MCBSP_XCR_XDATDLY(v) ((v) << 16)
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#define DAVINCI_MCBSP_XCR_XFIG (1 << 18)
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#define DAVINCI_MCBSP_XCR_XWDLEN2(v) ((v) << 21)
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#define DAVINCI_MCBSP_SRGR_FWID(v) ((v) << 8)
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#define DAVINCI_MCBSP_SRGR_FPER(v) ((v) << 16)
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#define DAVINCI_MCBSP_SRGR_FSGM (1 << 28)
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#define DAVINCI_MCBSP_PCR_CLKRP (1 << 0)
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#define DAVINCI_MCBSP_PCR_CLKXP (1 << 1)
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#define DAVINCI_MCBSP_PCR_FSRP (1 << 2)
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#define DAVINCI_MCBSP_PCR_FSXP (1 << 3)
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#define DAVINCI_MCBSP_PCR_CLKRM (1 << 8)
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#define DAVINCI_MCBSP_PCR_CLKXM (1 << 9)
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#define DAVINCI_MCBSP_PCR_FSRM (1 << 10)
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#define DAVINCI_MCBSP_PCR_FSXM (1 << 11)
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#define MOD_REG_BIT(val, mask, set) do { \
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if (set) { \
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val |= mask; \
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} else { \
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val &= ~mask; \
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} \
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} while (0)
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enum {
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DAVINCI_MCBSP_WORD_8 = 0,
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DAVINCI_MCBSP_WORD_12,
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DAVINCI_MCBSP_WORD_16,
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DAVINCI_MCBSP_WORD_20,
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DAVINCI_MCBSP_WORD_24,
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DAVINCI_MCBSP_WORD_32,
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};
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static struct davinci_pcm_dma_params davinci_i2s_pcm_out = {
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.name = "I2S PCM Stereo out",
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};
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static struct davinci_pcm_dma_params davinci_i2s_pcm_in = {
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.name = "I2S PCM Stereo in",
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};
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struct davinci_mcbsp_dev {
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void __iomem *base;
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struct clk *clk;
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struct davinci_pcm_dma_params *dma_params[2];
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};
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static inline void davinci_mcbsp_write_reg(struct davinci_mcbsp_dev *dev,
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int reg, u32 val)
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{
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__raw_writel(val, dev->base + reg);
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}
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static inline u32 davinci_mcbsp_read_reg(struct davinci_mcbsp_dev *dev, int reg)
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{
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return __raw_readl(dev->base + reg);
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}
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static void davinci_mcbsp_start(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
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u32 w;
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/* Start the sample generator and enable transmitter/receiver */
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w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
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MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_GRST, 1);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_XRST, 1);
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else
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MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_RRST, 1);
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
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/* Start frame sync */
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w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
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MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_FRST, 1);
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
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}
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static void davinci_mcbsp_stop(struct snd_pcm_substream *substream)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
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u32 w;
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/* Reset transmitter/receiver and sample rate/frame sync generators */
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w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
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MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_GRST |
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DAVINCI_MCBSP_SPCR_FRST, 0);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_XRST, 0);
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else
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MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_RRST, 0);
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
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}
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static int davinci_i2s_startup(struct snd_pcm_substream *substream)
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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->dai->cpu_dai;
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struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
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cpu_dai->dma_data = dev->dma_params[substream->stream];
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return 0;
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}
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static int davinci_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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struct davinci_mcbsp_dev *dev = cpu_dai->private_data;
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u32 w;
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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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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG,
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DAVINCI_MCBSP_PCR_FSXM |
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DAVINCI_MCBSP_PCR_FSRM |
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DAVINCI_MCBSP_PCR_CLKXM |
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DAVINCI_MCBSP_PCR_CLKRM);
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG,
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DAVINCI_MCBSP_SRGR_FSGM);
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break;
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case SND_SOC_DAIFMT_CBM_CFM:
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, 0);
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break;
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default:
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return -EINVAL;
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}
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switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
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case SND_SOC_DAIFMT_IB_NF:
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w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_PCR_REG);
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MOD_REG_BIT(w, DAVINCI_MCBSP_PCR_CLKXP |
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DAVINCI_MCBSP_PCR_CLKRP, 1);
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, w);
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break;
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case SND_SOC_DAIFMT_NB_IF:
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w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_PCR_REG);
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MOD_REG_BIT(w, DAVINCI_MCBSP_PCR_FSXP |
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DAVINCI_MCBSP_PCR_FSRP, 1);
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, w);
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break;
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case SND_SOC_DAIFMT_IB_IF:
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w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_PCR_REG);
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MOD_REG_BIT(w, DAVINCI_MCBSP_PCR_CLKXP |
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DAVINCI_MCBSP_PCR_CLKRP |
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DAVINCI_MCBSP_PCR_FSXP |
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DAVINCI_MCBSP_PCR_FSRP, 1);
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, w);
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break;
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case SND_SOC_DAIFMT_NB_NF:
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct davinci_pcm_dma_params *dma_params = rtd->dai->cpu_dai->dma_data;
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struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
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struct snd_interval *i = NULL;
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int mcbsp_word_length;
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u32 w;
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/* general line settings */
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG,
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DAVINCI_MCBSP_SPCR_RINTM(3) |
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DAVINCI_MCBSP_SPCR_XINTM(3) |
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DAVINCI_MCBSP_SPCR_FREE);
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_RCR_REG,
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DAVINCI_MCBSP_RCR_RFRLEN1(1) |
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DAVINCI_MCBSP_RCR_RDATDLY(1));
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_XCR_REG,
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DAVINCI_MCBSP_XCR_XFRLEN1(1) |
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DAVINCI_MCBSP_XCR_XDATDLY(1) |
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DAVINCI_MCBSP_XCR_XFIG);
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i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
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w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SRGR_REG);
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MOD_REG_BIT(w, DAVINCI_MCBSP_SRGR_FWID(snd_interval_value(i) - 1), 1);
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, w);
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i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_FRAME_BITS);
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w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SRGR_REG);
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MOD_REG_BIT(w, DAVINCI_MCBSP_SRGR_FPER(snd_interval_value(i) - 1), 1);
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, w);
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/* Determine xfer data type */
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switch (params_format(params)) {
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case SNDRV_PCM_FORMAT_S8:
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dma_params->data_type = 1;
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mcbsp_word_length = DAVINCI_MCBSP_WORD_8;
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break;
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case SNDRV_PCM_FORMAT_S16_LE:
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dma_params->data_type = 2;
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mcbsp_word_length = DAVINCI_MCBSP_WORD_16;
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break;
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case SNDRV_PCM_FORMAT_S32_LE:
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dma_params->data_type = 4;
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mcbsp_word_length = DAVINCI_MCBSP_WORD_32;
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break;
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default:
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printk(KERN_WARNING "davinci-i2s: unsupported PCM format");
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return -EINVAL;
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}
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w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_RCR_REG);
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MOD_REG_BIT(w, DAVINCI_MCBSP_RCR_RWDLEN1(mcbsp_word_length) |
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DAVINCI_MCBSP_RCR_RWDLEN2(mcbsp_word_length), 1);
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_RCR_REG, w);
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w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_XCR_REG);
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MOD_REG_BIT(w, DAVINCI_MCBSP_XCR_XWDLEN1(mcbsp_word_length) |
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DAVINCI_MCBSP_XCR_XWDLEN2(mcbsp_word_length), 1);
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davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_XCR_REG, w);
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return 0;
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}
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static int davinci_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
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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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case SNDRV_PCM_TRIGGER_RESUME:
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
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davinci_mcbsp_start(substream);
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break;
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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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davinci_mcbsp_stop(substream);
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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 int davinci_i2s_probe(struct platform_device *pdev,
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struct snd_soc_dai *dai)
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{
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struct snd_soc_device *socdev = platform_get_drvdata(pdev);
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struct snd_soc_machine *machine = socdev->machine;
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struct snd_soc_dai *cpu_dai = machine->dai_link[pdev->id].cpu_dai;
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struct davinci_mcbsp_dev *dev;
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struct resource *mem, *ioarea;
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struct evm_snd_platform_data *pdata;
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int ret;
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!mem) {
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dev_err(&pdev->dev, "no mem resource?\n");
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return -ENODEV;
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}
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ioarea = request_mem_region(mem->start, (mem->end - mem->start) + 1,
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pdev->name);
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if (!ioarea) {
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dev_err(&pdev->dev, "McBSP region already claimed\n");
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return -EBUSY;
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}
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dev = kzalloc(sizeof(struct davinci_mcbsp_dev), GFP_KERNEL);
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if (!dev) {
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ret = -ENOMEM;
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goto err_release_region;
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}
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cpu_dai->private_data = dev;
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dev->clk = clk_get(&pdev->dev, "McBSPCLK");
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if (IS_ERR(dev->clk)) {
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ret = -ENODEV;
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goto err_free_mem;
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}
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clk_enable(dev->clk);
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dev->base = (void __iomem *)IO_ADDRESS(mem->start);
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pdata = pdev->dev.platform_data;
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dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK] = &davinci_i2s_pcm_out;
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dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK]->channel = pdata->tx_dma_ch;
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dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK]->dma_addr =
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(dma_addr_t)(io_v2p(dev->base) + DAVINCI_MCBSP_DXR_REG);
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dev->dma_params[SNDRV_PCM_STREAM_CAPTURE] = &davinci_i2s_pcm_in;
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dev->dma_params[SNDRV_PCM_STREAM_CAPTURE]->channel = pdata->rx_dma_ch;
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dev->dma_params[SNDRV_PCM_STREAM_CAPTURE]->dma_addr =
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(dma_addr_t)(io_v2p(dev->base) + DAVINCI_MCBSP_DRR_REG);
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return 0;
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err_free_mem:
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kfree(dev);
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err_release_region:
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release_mem_region(mem->start, (mem->end - mem->start) + 1);
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return ret;
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}
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static void davinci_i2s_remove(struct platform_device *pdev,
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struct snd_soc_dai *dai)
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{
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struct snd_soc_device *socdev = platform_get_drvdata(pdev);
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struct snd_soc_machine *machine = socdev->machine;
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struct snd_soc_dai *cpu_dai = machine->dai_link[pdev->id].cpu_dai;
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struct davinci_mcbsp_dev *dev = cpu_dai->private_data;
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struct resource *mem;
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clk_disable(dev->clk);
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clk_put(dev->clk);
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dev->clk = NULL;
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kfree(dev);
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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release_mem_region(mem->start, (mem->end - mem->start) + 1);
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}
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#define DAVINCI_I2S_RATES SNDRV_PCM_RATE_8000_96000
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struct snd_soc_dai davinci_i2s_dai = {
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.name = "davinci-i2s",
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.id = 0,
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.type = SND_SOC_DAI_I2S,
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.probe = davinci_i2s_probe,
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.remove = davinci_i2s_remove,
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.playback = {
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.channels_min = 2,
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.channels_max = 2,
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.rates = DAVINCI_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 = DAVINCI_I2S_RATES,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,},
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.ops = {
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.startup = davinci_i2s_startup,
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.trigger = davinci_i2s_trigger,
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.hw_params = davinci_i2s_hw_params,},
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.dai_ops = {
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.set_fmt = davinci_i2s_set_dai_fmt,
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},
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};
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EXPORT_SYMBOL_GPL(davinci_i2s_dai);
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MODULE_AUTHOR("Vladimir Barinov");
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MODULE_DESCRIPTION("TI DAVINCI I2S (McBSP) SoC Interface");
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MODULE_LICENSE("GPL");
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