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linux/sound/soc/ti/davinci-i2s.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* ALSA SoC I2S (McBSP) Audio Layer for TI DAVINCI processor
*
* Author: Vladimir Barinov, <vbarinov@embeddedalley.com>
* Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com>
*
* DT support (c) 2016 Petr Kulhavy, Barix AG <petr@barix.com>
* based on davinci-mcasp.c DT support
*
* TODO:
* on DA850 implement HW FIFOs instead of DMA into DXR and DRR registers
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/platform_data/davinci_asp.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>
#include "edma-pcm.h"
#include "davinci-i2s.h"
#define DRV_NAME "davinci-i2s"
/*
* NOTE: terminology here is confusing.
*
* - This driver supports the "Audio Serial Port" (ASP),
* found on dm6446, dm355, and other DaVinci chips.
*
* - But it labels it a "Multi-channel Buffered Serial Port"
* (McBSP) as on older chips like the dm642 ... which was
* backward-compatible, possibly explaining that confusion.
*
* - OMAP chips have a controller called McBSP, which is
* incompatible with the DaVinci flavor of McBSP.
*
* - Newer DaVinci chips have a controller called McASP,
* incompatible with ASP and with either McBSP.
*
* In short: this uses ASP to implement I2S, not McBSP.
* And it won't be the only DaVinci implemention of I2S.
*/
#define DAVINCI_MCBSP_DRR_REG 0x00
#define DAVINCI_MCBSP_DXR_REG 0x04
#define DAVINCI_MCBSP_SPCR_REG 0x08
#define DAVINCI_MCBSP_RCR_REG 0x0c
#define DAVINCI_MCBSP_XCR_REG 0x10
#define DAVINCI_MCBSP_SRGR_REG 0x14
#define DAVINCI_MCBSP_PCR_REG 0x24
#define DAVINCI_MCBSP_SPCR_RRST (1 << 0)
#define DAVINCI_MCBSP_SPCR_RINTM(v) ((v) << 4)
#define DAVINCI_MCBSP_SPCR_XRST (1 << 16)
#define DAVINCI_MCBSP_SPCR_XINTM(v) ((v) << 20)
#define DAVINCI_MCBSP_SPCR_GRST (1 << 22)
#define DAVINCI_MCBSP_SPCR_FRST (1 << 23)
#define DAVINCI_MCBSP_SPCR_FREE (1 << 25)
#define DAVINCI_MCBSP_RCR_RWDLEN1(v) ((v) << 5)
#define DAVINCI_MCBSP_RCR_RFRLEN1(v) ((v) << 8)
#define DAVINCI_MCBSP_RCR_RDATDLY(v) ((v) << 16)
#define DAVINCI_MCBSP_RCR_RFIG (1 << 18)
#define DAVINCI_MCBSP_RCR_RWDLEN2(v) ((v) << 21)
#define DAVINCI_MCBSP_RCR_RFRLEN2(v) ((v) << 24)
#define DAVINCI_MCBSP_RCR_RPHASE BIT(31)
#define DAVINCI_MCBSP_XCR_XWDLEN1(v) ((v) << 5)
#define DAVINCI_MCBSP_XCR_XFRLEN1(v) ((v) << 8)
#define DAVINCI_MCBSP_XCR_XDATDLY(v) ((v) << 16)
#define DAVINCI_MCBSP_XCR_XFIG (1 << 18)
#define DAVINCI_MCBSP_XCR_XWDLEN2(v) ((v) << 21)
#define DAVINCI_MCBSP_XCR_XFRLEN2(v) ((v) << 24)
#define DAVINCI_MCBSP_XCR_XPHASE BIT(31)
#define DAVINCI_MCBSP_SRGR_FWID(v) ((v) << 8)
#define DAVINCI_MCBSP_SRGR_FPER(v) ((v) << 16)
#define DAVINCI_MCBSP_SRGR_FSGM (1 << 28)
#define DAVINCI_MCBSP_SRGR_CLKSM BIT(29)
#define DAVINCI_MCBSP_PCR_CLKRP (1 << 0)
#define DAVINCI_MCBSP_PCR_CLKXP (1 << 1)
#define DAVINCI_MCBSP_PCR_FSRP (1 << 2)
#define DAVINCI_MCBSP_PCR_FSXP (1 << 3)
#define DAVINCI_MCBSP_PCR_SCLKME (1 << 7)
#define DAVINCI_MCBSP_PCR_CLKRM (1 << 8)
#define DAVINCI_MCBSP_PCR_CLKXM (1 << 9)
#define DAVINCI_MCBSP_PCR_FSRM (1 << 10)
#define DAVINCI_MCBSP_PCR_FSXM (1 << 11)
enum {
DAVINCI_MCBSP_WORD_8 = 0,
DAVINCI_MCBSP_WORD_12,
DAVINCI_MCBSP_WORD_16,
DAVINCI_MCBSP_WORD_20,
DAVINCI_MCBSP_WORD_24,
DAVINCI_MCBSP_WORD_32,
};
static const unsigned char data_type[SNDRV_PCM_FORMAT_S32_LE + 1] = {
[SNDRV_PCM_FORMAT_S8] = 1,
[SNDRV_PCM_FORMAT_S16_LE] = 2,
[SNDRV_PCM_FORMAT_S32_LE] = 4,
};
static const unsigned char asp_word_length[SNDRV_PCM_FORMAT_S32_LE + 1] = {
[SNDRV_PCM_FORMAT_S8] = DAVINCI_MCBSP_WORD_8,
[SNDRV_PCM_FORMAT_S16_LE] = DAVINCI_MCBSP_WORD_16,
[SNDRV_PCM_FORMAT_S32_LE] = DAVINCI_MCBSP_WORD_32,
};
static const unsigned char double_fmt[SNDRV_PCM_FORMAT_S32_LE + 1] = {
[SNDRV_PCM_FORMAT_S8] = SNDRV_PCM_FORMAT_S16_LE,
[SNDRV_PCM_FORMAT_S16_LE] = SNDRV_PCM_FORMAT_S32_LE,
};
struct davinci_mcbsp_dev {
struct device *dev;
struct snd_dmaengine_dai_dma_data dma_data[2];
int dma_request[2];
void __iomem *base;
#define MOD_DSP_A 0
#define MOD_DSP_B 1
int mode;
u32 pcr;
struct clk *clk;
/*
* Combining both channels into 1 element will at least double the
* amount of time between servicing the dma channel, increase
* effiency, and reduce the chance of overrun/underrun. But,
* it will result in the left & right channels being swapped.
*
* If relabeling the left and right channels is not possible,
* you may want to let the codec know to swap them back.
*
* It may allow x10 the amount of time to service dma requests,
* if the codec is master and is using an unnecessarily fast bit clock
* (ie. tlvaic23b), independent of the sample rate. So, having an
* entire frame at once means it can be serviced at the sample rate
* instead of the bit clock rate.
*
* In the now unlikely case that an underrun still
* occurs, both the left and right samples will be repeated
* so that no pops are heard, and the left and right channels
* won't end up being swapped because of the underrun.
*/
unsigned enable_channel_combine:1;
unsigned int fmt;
int clk_div;
int clk_input_pin;
bool i2s_accurate_sck;
};
static inline void davinci_mcbsp_write_reg(struct davinci_mcbsp_dev *dev,
int reg, u32 val)
{
__raw_writel(val, dev->base + reg);
}
static inline u32 davinci_mcbsp_read_reg(struct davinci_mcbsp_dev *dev, int reg)
{
return __raw_readl(dev->base + reg);
}
static void toggle_clock(struct davinci_mcbsp_dev *dev, int playback)
{
u32 m = playback ? DAVINCI_MCBSP_PCR_CLKXP : DAVINCI_MCBSP_PCR_CLKRP;
/* The clock needs to toggle to complete reset.
* So, fake it by toggling the clk polarity.
*/
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, dev->pcr ^ m);
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, dev->pcr);
}
static void davinci_mcbsp_start(struct davinci_mcbsp_dev *dev,
struct snd_pcm_substream *substream)
{
int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
u32 spcr;
u32 mask = playback ? DAVINCI_MCBSP_SPCR_XRST : DAVINCI_MCBSP_SPCR_RRST;
/* Enable transmitter or receiver */
spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
spcr |= mask;
if (dev->pcr & (DAVINCI_MCBSP_PCR_FSXM | DAVINCI_MCBSP_PCR_FSRM)) {
/* Start frame sync */
spcr |= DAVINCI_MCBSP_SPCR_FRST;
}
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
}
static void davinci_mcbsp_stop(struct davinci_mcbsp_dev *dev, int playback)
{
u32 spcr;
/* Reset transmitter/receiver and sample rate/frame sync generators */
spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
spcr &= ~(DAVINCI_MCBSP_SPCR_GRST | DAVINCI_MCBSP_SPCR_FRST);
spcr &= playback ? ~DAVINCI_MCBSP_SPCR_XRST : ~DAVINCI_MCBSP_SPCR_RRST;
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
toggle_clock(dev, playback);
}
#define DEFAULT_BITPERSAMPLE 16
static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
unsigned int fmt)
{
struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
unsigned int pcr;
unsigned int srgr;
bool inv_fs = false;
/* Attention srgr is updated by hw_params! */
srgr = DAVINCI_MCBSP_SRGR_FSGM |
DAVINCI_MCBSP_SRGR_FPER(DEFAULT_BITPERSAMPLE * 2 - 1) |
DAVINCI_MCBSP_SRGR_FWID(DEFAULT_BITPERSAMPLE - 1);
dev->fmt = fmt;
/* set master/slave audio interface */
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBS_CFS:
/* cpu is master */
pcr = DAVINCI_MCBSP_PCR_FSXM |
DAVINCI_MCBSP_PCR_FSRM |
DAVINCI_MCBSP_PCR_CLKXM |
DAVINCI_MCBSP_PCR_CLKRM;
break;
case SND_SOC_DAIFMT_CBM_CFS:
pcr = DAVINCI_MCBSP_PCR_FSRM | DAVINCI_MCBSP_PCR_FSXM;
/*
* Selection of the clock input pin that is the
* input for the Sample Rate Generator.
* McBSP FSR and FSX are driven by the Sample Rate
* Generator.
*/
switch (dev->clk_input_pin) {
case MCBSP_CLKS:
pcr |= DAVINCI_MCBSP_PCR_CLKXM |
DAVINCI_MCBSP_PCR_CLKRM;
break;
case MCBSP_CLKR:
pcr |= DAVINCI_MCBSP_PCR_SCLKME;
break;
default:
dev_err(dev->dev, "bad clk_input_pin\n");
return -EINVAL;
}
break;
case SND_SOC_DAIFMT_CBM_CFM:
/* codec is master */
pcr = 0;
break;
default:
printk(KERN_ERR "%s:bad master\n", __func__);
return -EINVAL;
}
/* interface format */
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
/* Davinci doesn't support TRUE I2S, but some codecs will have
* the left and right channels contiguous. This allows
* dsp_a mode to be used with an inverted normal frame clk.
* If your codec is master and does not have contiguous
* channels, then you will have sound on only one channel.
* Try using a different mode, or codec as slave.
*
* The TLV320AIC33 is an example of a codec where this works.
* It has a variable bit clock frequency allowing it to have
* valid data on every bit clock.
*
* The TLV320AIC23 is an example of a codec where this does not
* work. It has a fixed bit clock frequency with progressively
* more empty bit clock slots between channels as the sample
* rate is lowered.
*/
inv_fs = true;
/* fall through */
case SND_SOC_DAIFMT_DSP_A:
dev->mode = MOD_DSP_A;
break;
case SND_SOC_DAIFMT_DSP_B:
dev->mode = MOD_DSP_B;
break;
default:
printk(KERN_ERR "%s:bad format\n", __func__);
return -EINVAL;
}
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
/* CLKRP Receive clock polarity,
* 1 - sampled on rising edge of CLKR
* valid on rising edge
* CLKXP Transmit clock polarity,
* 1 - clocked on falling edge of CLKX
* valid on rising edge
* FSRP Receive frame sync pol, 0 - active high
* FSXP Transmit frame sync pol, 0 - active high
*/
pcr |= (DAVINCI_MCBSP_PCR_CLKXP | DAVINCI_MCBSP_PCR_CLKRP);
break;
case SND_SOC_DAIFMT_IB_IF:
/* CLKRP Receive clock polarity,
* 0 - sampled on falling edge of CLKR
* valid on falling edge
* CLKXP Transmit clock polarity,
* 0 - clocked on rising edge of CLKX
* valid on falling edge
* FSRP Receive frame sync pol, 1 - active low
* FSXP Transmit frame sync pol, 1 - active low
*/
pcr |= (DAVINCI_MCBSP_PCR_FSXP | DAVINCI_MCBSP_PCR_FSRP);
break;
case SND_SOC_DAIFMT_NB_IF:
/* CLKRP Receive clock polarity,
* 1 - sampled on rising edge of CLKR
* valid on rising edge
* CLKXP Transmit clock polarity,
* 1 - clocked on falling edge of CLKX
* valid on rising edge
* FSRP Receive frame sync pol, 1 - active low
* FSXP Transmit frame sync pol, 1 - active low
*/
pcr |= (DAVINCI_MCBSP_PCR_CLKXP | DAVINCI_MCBSP_PCR_CLKRP |
DAVINCI_MCBSP_PCR_FSXP | DAVINCI_MCBSP_PCR_FSRP);
break;
case SND_SOC_DAIFMT_IB_NF:
/* CLKRP Receive clock polarity,
* 0 - sampled on falling edge of CLKR
* valid on falling edge
* CLKXP Transmit clock polarity,
* 0 - clocked on rising edge of CLKX
* valid on falling edge
* FSRP Receive frame sync pol, 0 - active high
* FSXP Transmit frame sync pol, 0 - active high
*/
break;
default:
return -EINVAL;
}
if (inv_fs == true)
pcr ^= (DAVINCI_MCBSP_PCR_FSXP | DAVINCI_MCBSP_PCR_FSRP);
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, srgr);
dev->pcr = pcr;
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, pcr);
return 0;
}
static int davinci_i2s_dai_set_clkdiv(struct snd_soc_dai *cpu_dai,
int div_id, int div)
{
struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
if (div_id != DAVINCI_MCBSP_CLKGDV)
return -ENODEV;
dev->clk_div = div;
return 0;
}
static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
struct snd_interval *i = NULL;
int mcbsp_word_length, master;
unsigned int rcr, xcr, srgr, clk_div, freq, framesize;
u32 spcr;
snd_pcm_format_t fmt;
unsigned element_cnt = 1;
/* general line settings */
spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
spcr |= DAVINCI_MCBSP_SPCR_RINTM(3) | DAVINCI_MCBSP_SPCR_FREE;
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
} else {
spcr |= DAVINCI_MCBSP_SPCR_XINTM(3) | DAVINCI_MCBSP_SPCR_FREE;
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
}
master = dev->fmt & SND_SOC_DAIFMT_MASTER_MASK;
fmt = params_format(params);
mcbsp_word_length = asp_word_length[fmt];
switch (master) {
case SND_SOC_DAIFMT_CBS_CFS:
freq = clk_get_rate(dev->clk);
srgr = DAVINCI_MCBSP_SRGR_FSGM |
DAVINCI_MCBSP_SRGR_CLKSM;
srgr |= DAVINCI_MCBSP_SRGR_FWID(mcbsp_word_length *
8 - 1);
if (dev->i2s_accurate_sck) {
clk_div = 256;
do {
framesize = (freq / (--clk_div)) /
params->rate_num *
params->rate_den;
} while (((framesize < 33) || (framesize > 4095)) &&
(clk_div));
clk_div--;
srgr |= DAVINCI_MCBSP_SRGR_FPER(framesize - 1);
} else {
/* symmetric waveforms */
clk_div = freq / (mcbsp_word_length * 16) /
params->rate_num * params->rate_den;
srgr |= DAVINCI_MCBSP_SRGR_FPER(mcbsp_word_length *
16 - 1);
}
clk_div &= 0xFF;
srgr |= clk_div;
break;
case SND_SOC_DAIFMT_CBM_CFS:
srgr = DAVINCI_MCBSP_SRGR_FSGM;
clk_div = dev->clk_div - 1;
srgr |= DAVINCI_MCBSP_SRGR_FWID(mcbsp_word_length * 8 - 1);
srgr |= DAVINCI_MCBSP_SRGR_FPER(mcbsp_word_length * 16 - 1);
clk_div &= 0xFF;
srgr |= clk_div;
break;
case SND_SOC_DAIFMT_CBM_CFM:
/* Clock and frame sync given from external sources */
i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
srgr = DAVINCI_MCBSP_SRGR_FSGM;
srgr |= DAVINCI_MCBSP_SRGR_FWID(snd_interval_value(i) - 1);
pr_debug("%s - %d FWID set: re-read srgr = %X\n",
__func__, __LINE__, snd_interval_value(i) - 1);
i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_FRAME_BITS);
srgr |= DAVINCI_MCBSP_SRGR_FPER(snd_interval_value(i) - 1);
break;
default:
return -EINVAL;
}
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, srgr);
rcr = DAVINCI_MCBSP_RCR_RFIG;
xcr = DAVINCI_MCBSP_XCR_XFIG;
if (dev->mode == MOD_DSP_B) {
rcr |= DAVINCI_MCBSP_RCR_RDATDLY(0);
xcr |= DAVINCI_MCBSP_XCR_XDATDLY(0);
} else {
rcr |= DAVINCI_MCBSP_RCR_RDATDLY(1);
xcr |= DAVINCI_MCBSP_XCR_XDATDLY(1);
}
/* Determine xfer data type */
fmt = params_format(params);
if ((fmt > SNDRV_PCM_FORMAT_S32_LE) || !data_type[fmt]) {
printk(KERN_WARNING "davinci-i2s: unsupported PCM format\n");
return -EINVAL;
}
if (params_channels(params) == 2) {
element_cnt = 2;
if (double_fmt[fmt] && dev->enable_channel_combine) {
element_cnt = 1;
fmt = double_fmt[fmt];
}
switch (master) {
case SND_SOC_DAIFMT_CBS_CFS:
case SND_SOC_DAIFMT_CBS_CFM:
rcr |= DAVINCI_MCBSP_RCR_RFRLEN2(0);
xcr |= DAVINCI_MCBSP_XCR_XFRLEN2(0);
rcr |= DAVINCI_MCBSP_RCR_RPHASE;
xcr |= DAVINCI_MCBSP_XCR_XPHASE;
break;
case SND_SOC_DAIFMT_CBM_CFM:
case SND_SOC_DAIFMT_CBM_CFS:
rcr |= DAVINCI_MCBSP_RCR_RFRLEN2(element_cnt - 1);
xcr |= DAVINCI_MCBSP_XCR_XFRLEN2(element_cnt - 1);
break;
default:
return -EINVAL;
}
}
mcbsp_word_length = asp_word_length[fmt];
switch (master) {
case SND_SOC_DAIFMT_CBS_CFS:
case SND_SOC_DAIFMT_CBS_CFM:
rcr |= DAVINCI_MCBSP_RCR_RFRLEN1(0);
xcr |= DAVINCI_MCBSP_XCR_XFRLEN1(0);
break;
case SND_SOC_DAIFMT_CBM_CFM:
case SND_SOC_DAIFMT_CBM_CFS:
rcr |= DAVINCI_MCBSP_RCR_RFRLEN1(element_cnt - 1);
xcr |= DAVINCI_MCBSP_XCR_XFRLEN1(element_cnt - 1);
break;
default:
return -EINVAL;
}
rcr |= DAVINCI_MCBSP_RCR_RWDLEN1(mcbsp_word_length) |
DAVINCI_MCBSP_RCR_RWDLEN2(mcbsp_word_length);
xcr |= DAVINCI_MCBSP_XCR_XWDLEN1(mcbsp_word_length) |
DAVINCI_MCBSP_XCR_XWDLEN2(mcbsp_word_length);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_XCR_REG, xcr);
else
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_RCR_REG, rcr);
pr_debug("%s - %d srgr=%X\n", __func__, __LINE__, srgr);
pr_debug("%s - %d xcr=%X\n", __func__, __LINE__, xcr);
pr_debug("%s - %d rcr=%X\n", __func__, __LINE__, rcr);
return 0;
}
static int davinci_i2s_prepare(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
u32 spcr;
u32 mask = playback ? DAVINCI_MCBSP_SPCR_XRST : DAVINCI_MCBSP_SPCR_RRST;
davinci_mcbsp_stop(dev, playback);
spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
if (spcr & mask) {
/* start off disabled */
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG,
spcr & ~mask);
toggle_clock(dev, playback);
}
if (dev->pcr & (DAVINCI_MCBSP_PCR_FSXM | DAVINCI_MCBSP_PCR_FSRM |
DAVINCI_MCBSP_PCR_CLKXM | DAVINCI_MCBSP_PCR_CLKRM)) {
/* Start the sample generator */
spcr |= DAVINCI_MCBSP_SPCR_GRST;
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
}
if (playback) {
/* Enable the transmitter */
spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
spcr |= DAVINCI_MCBSP_SPCR_XRST;
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
/* wait for any unexpected frame sync error to occur */
udelay(100);
/* Disable the transmitter to clear any outstanding XSYNCERR */
spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
spcr &= ~DAVINCI_MCBSP_SPCR_XRST;
davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
toggle_clock(dev, playback);
}
return 0;
}
static int davinci_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
int ret = 0;
int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
davinci_mcbsp_start(dev, substream);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
davinci_mcbsp_stop(dev, playback);
break;
default:
ret = -EINVAL;
}
return ret;
}
static void davinci_i2s_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
davinci_mcbsp_stop(dev, playback);
}
#define DAVINCI_I2S_RATES SNDRV_PCM_RATE_8000_96000
#define DAVINCI_I2S_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
SNDRV_PCM_FMTBIT_S32_LE)
static const struct snd_soc_dai_ops davinci_i2s_dai_ops = {
.shutdown = davinci_i2s_shutdown,
.prepare = davinci_i2s_prepare,
.trigger = davinci_i2s_trigger,
.hw_params = davinci_i2s_hw_params,
.set_fmt = davinci_i2s_set_dai_fmt,
.set_clkdiv = davinci_i2s_dai_set_clkdiv,
};
static int davinci_i2s_dai_probe(struct snd_soc_dai *dai)
{
struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
dai->playback_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
dai->capture_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE];
return 0;
}
static struct snd_soc_dai_driver davinci_i2s_dai = {
.probe = davinci_i2s_dai_probe,
.playback = {
.channels_min = 2,
.channels_max = 2,
.rates = DAVINCI_I2S_RATES,
.formats = DAVINCI_I2S_FORMATS,
},
.capture = {
.channels_min = 2,
.channels_max = 2,
.rates = DAVINCI_I2S_RATES,
.formats = DAVINCI_I2S_FORMATS,
},
.ops = &davinci_i2s_dai_ops,
};
static const struct snd_soc_component_driver davinci_i2s_component = {
.name = DRV_NAME,
};
static int davinci_i2s_probe(struct platform_device *pdev)
{
struct snd_dmaengine_dai_dma_data *dma_data;
struct davinci_mcbsp_dev *dev;
struct resource *mem, *res;
void __iomem *io_base;
int *dma;
int ret;
mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
if (!mem) {
dev_warn(&pdev->dev,
"\"mpu\" mem resource not found, using index 0\n");
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem) {
dev_err(&pdev->dev, "no mem resource?\n");
return -ENODEV;
}
}
io_base = devm_ioremap_resource(&pdev->dev, mem);
if (IS_ERR(io_base))
return PTR_ERR(io_base);
dev = devm_kzalloc(&pdev->dev, sizeof(struct davinci_mcbsp_dev),
GFP_KERNEL);
if (!dev)
return -ENOMEM;
dev->base = io_base;
/* setup DMA, first TX, then RX */
dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
dma_data->addr = (dma_addr_t)(mem->start + DAVINCI_MCBSP_DXR_REG);
res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
if (res) {
dma = &dev->dma_request[SNDRV_PCM_STREAM_PLAYBACK];
*dma = res->start;
dma_data->filter_data = dma;
} else if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
dma_data->filter_data = "tx";
} else {
dev_err(&pdev->dev, "Missing DMA tx resource\n");
return -ENODEV;
}
dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE];
dma_data->addr = (dma_addr_t)(mem->start + DAVINCI_MCBSP_DRR_REG);
res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
if (res) {
dma = &dev->dma_request[SNDRV_PCM_STREAM_CAPTURE];
*dma = res->start;
dma_data->filter_data = dma;
} else if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
dma_data->filter_data = "rx";
} else {
dev_err(&pdev->dev, "Missing DMA rx resource\n");
return -ENODEV;
}
dev->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(dev->clk))
return -ENODEV;
clk_enable(dev->clk);
dev->dev = &pdev->dev;
dev_set_drvdata(&pdev->dev, dev);
ret = snd_soc_register_component(&pdev->dev, &davinci_i2s_component,
&davinci_i2s_dai, 1);
if (ret != 0)
goto err_release_clk;
ret = edma_pcm_platform_register(&pdev->dev);
if (ret) {
dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
goto err_unregister_component;
}
return 0;
err_unregister_component:
snd_soc_unregister_component(&pdev->dev);
err_release_clk:
clk_disable(dev->clk);
clk_put(dev->clk);
return ret;
}
static int davinci_i2s_remove(struct platform_device *pdev)
{
struct davinci_mcbsp_dev *dev = dev_get_drvdata(&pdev->dev);
snd_soc_unregister_component(&pdev->dev);
clk_disable(dev->clk);
clk_put(dev->clk);
dev->clk = NULL;
return 0;
}
static const struct of_device_id davinci_i2s_match[] = {
{ .compatible = "ti,da850-mcbsp" },
{},
};
MODULE_DEVICE_TABLE(of, davinci_i2s_match);
static struct platform_driver davinci_mcbsp_driver = {
.probe = davinci_i2s_probe,
.remove = davinci_i2s_remove,
.driver = {
.name = "davinci-mcbsp",
.of_match_table = of_match_ptr(davinci_i2s_match),
},
};
module_platform_driver(davinci_mcbsp_driver);
MODULE_AUTHOR("Vladimir Barinov");
MODULE_DESCRIPTION("TI DAVINCI I2S (McBSP) SoC Interface");
MODULE_LICENSE("GPL");
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