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linux/sound/soc/ti/davinci-i2s.c
Peter Ujfalusi f2055e145f
ASoC: ti: Merge davinci and omap directories 
Create new directory to contain all Texas Instruments specific DAI,
platform and machine drivers instead of scattering them under davinci and
omap directories.

There is already inter dependency between the two directories becasue of
McASP (on dra7x it is serviced by sDMA, not EDMA).

With the upcoming AM654 we will need to introduce new platform driver for
UDMA and it does not fit under davinci, nor under omap.

With the move I have restructured the Kconfig to be more usable in the era
of simple-sound-card:
CPU DAIs can be selected individually and they will select the platform
driver they can be served with.

To avoid breakage, I have moved over deprecated Kconfig options so
defconfig builds will work without regression.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
For sound/soc/{omap => ti}:
Tested-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Acked-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2018-12-18 12:22:43 +00:00

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/*
* 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
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_component *component = snd_soc_rtdcom_lookup(rtd, DRV_NAME);
int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
u32 spcr;
u32 mask = playback ? DAVINCI_MCBSP_SPCR_XRST : DAVINCI_MCBSP_SPCR_RRST;
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) {
/* Stop the DMA to avoid data loss */
/* while the transmitter is out of reset to handle XSYNCERR */
if (component->driver->ops->trigger) {
int ret = component->driver->ops->trigger(substream,
SNDRV_PCM_TRIGGER_STOP);
if (ret < 0)
printk(KERN_DEBUG "Playback DMA stop failed\n");
}
/* 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);
/* Restart the DMA */
if (component->driver->ops->trigger) {
int ret = component->driver->ops->trigger(substream,
SNDRV_PCM_TRIGGER_START);
if (ret < 0)
printk(KERN_DEBUG "Playback DMA start failed\n");
}
}
/* 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);
davinci_mcbsp_stop(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
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 = SNDRV_PCM_FMTBIT_S16_LE,},
.capture = {
.channels_min = 2,
.channels_max = 2,
.rates = DAVINCI_I2S_RATES,
.formats = SNDRV_PCM_FMTBIT_S16_LE,},
.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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