https://github.com/torvalds/linux
Tip revision: d1abaeb3be7b5fa6d7a1fbbd2e14e3310005c4c1 authored by Linus Torvalds on 18 August 2019, 21:31:08 UTC
Linux 5.3-rc5
Linux 5.3-rc5
Tip revision: d1abaeb
i2sc.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* Au1000/Au1500/Au1100 I2S controller driver for ASoC
*
* (c) 2011 Manuel Lauss <manuel.lauss@googlemail.com>
*
* Note: clock supplied to the I2S controller must be 256x samplerate.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/suspend.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <asm/mach-au1x00/au1000.h>
#include "psc.h"
#define I2S_RXTX 0x00
#define I2S_CFG 0x04
#define I2S_ENABLE 0x08
#define CFG_XU (1 << 25) /* tx underflow */
#define CFG_XO (1 << 24)
#define CFG_RU (1 << 23)
#define CFG_RO (1 << 22)
#define CFG_TR (1 << 21)
#define CFG_TE (1 << 20)
#define CFG_TF (1 << 19)
#define CFG_RR (1 << 18)
#define CFG_RF (1 << 17)
#define CFG_ICK (1 << 12) /* clock invert */
#define CFG_PD (1 << 11) /* set to make I2SDIO INPUT */
#define CFG_LB (1 << 10) /* loopback */
#define CFG_IC (1 << 9) /* word select invert */
#define CFG_FM_I2S (0 << 7) /* I2S format */
#define CFG_FM_LJ (1 << 7) /* left-justified */
#define CFG_FM_RJ (2 << 7) /* right-justified */
#define CFG_FM_MASK (3 << 7)
#define CFG_TN (1 << 6) /* tx fifo en */
#define CFG_RN (1 << 5) /* rx fifo en */
#define CFG_SZ_8 (0x08)
#define CFG_SZ_16 (0x10)
#define CFG_SZ_18 (0x12)
#define CFG_SZ_20 (0x14)
#define CFG_SZ_24 (0x18)
#define CFG_SZ_MASK (0x1f)
#define EN_D (1 << 1) /* DISable */
#define EN_CE (1 << 0) /* clock enable */
/* only limited by clock generator and board design */
#define AU1XI2SC_RATES \
SNDRV_PCM_RATE_CONTINUOUS
#define AU1XI2SC_FMTS \
(SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 | \
SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | \
SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE | \
SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_U18_3LE | \
SNDRV_PCM_FMTBIT_S18_3BE | SNDRV_PCM_FMTBIT_U18_3BE | \
SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_U20_3LE | \
SNDRV_PCM_FMTBIT_S20_3BE | SNDRV_PCM_FMTBIT_U20_3BE | \
SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE | \
SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_U24_BE | \
0)
static inline unsigned long RD(struct au1xpsc_audio_data *ctx, int reg)
{
return __raw_readl(ctx->mmio + reg);
}
static inline void WR(struct au1xpsc_audio_data *ctx, int reg, unsigned long v)
{
__raw_writel(v, ctx->mmio + reg);
wmb();
}
static int au1xi2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
{
struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(cpu_dai);
unsigned long c;
int ret;
ret = -EINVAL;
c = ctx->cfg;
c &= ~CFG_FM_MASK;
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
c |= CFG_FM_I2S;
break;
case SND_SOC_DAIFMT_MSB:
c |= CFG_FM_RJ;
break;
case SND_SOC_DAIFMT_LSB:
c |= CFG_FM_LJ;
break;
default:
goto out;
}
c &= ~(CFG_IC | CFG_ICK); /* IB-IF */
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
c |= CFG_IC | CFG_ICK;
break;
case SND_SOC_DAIFMT_NB_IF:
c |= CFG_IC;
break;
case SND_SOC_DAIFMT_IB_NF:
c |= CFG_ICK;
break;
case SND_SOC_DAIFMT_IB_IF:
break;
default:
goto out;
}
/* I2S controller only supports master */
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBS_CFS: /* CODEC slave */
break;
default:
goto out;
}
ret = 0;
ctx->cfg = c;
out:
return ret;
}
static int au1xi2s_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_dai *dai)
{
struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(dai);
int stype = SUBSTREAM_TYPE(substream);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
/* power up */
WR(ctx, I2S_ENABLE, EN_D | EN_CE);
WR(ctx, I2S_ENABLE, EN_CE);
ctx->cfg |= (stype == PCM_TX) ? CFG_TN : CFG_RN;
WR(ctx, I2S_CFG, ctx->cfg);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
ctx->cfg &= ~((stype == PCM_TX) ? CFG_TN : CFG_RN);
WR(ctx, I2S_CFG, ctx->cfg);
WR(ctx, I2S_ENABLE, EN_D); /* power off */
break;
default:
return -EINVAL;
}
return 0;
}
static unsigned long msbits_to_reg(int msbits)
{
switch (msbits) {
case 8:
return CFG_SZ_8;
case 16:
return CFG_SZ_16;
case 18:
return CFG_SZ_18;
case 20:
return CFG_SZ_20;
case 24:
return CFG_SZ_24;
}
return 0;
}
static int au1xi2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(dai);
unsigned long v;
v = msbits_to_reg(params->msbits);
if (!v)
return -EINVAL;
ctx->cfg &= ~CFG_SZ_MASK;
ctx->cfg |= v;
return 0;
}
static int au1xi2s_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(dai);
snd_soc_dai_set_dma_data(dai, substream, &ctx->dmaids[0]);
return 0;
}
static const struct snd_soc_dai_ops au1xi2s_dai_ops = {
.startup = au1xi2s_startup,
.trigger = au1xi2s_trigger,
.hw_params = au1xi2s_hw_params,
.set_fmt = au1xi2s_set_fmt,
};
static struct snd_soc_dai_driver au1xi2s_dai_driver = {
.symmetric_rates = 1,
.playback = {
.rates = AU1XI2SC_RATES,
.formats = AU1XI2SC_FMTS,
.channels_min = 2,
.channels_max = 2,
},
.capture = {
.rates = AU1XI2SC_RATES,
.formats = AU1XI2SC_FMTS,
.channels_min = 2,
.channels_max = 2,
},
.ops = &au1xi2s_dai_ops,
};
static const struct snd_soc_component_driver au1xi2s_component = {
.name = "au1xi2s",
};
static int au1xi2s_drvprobe(struct platform_device *pdev)
{
struct resource *iores, *dmares;
struct au1xpsc_audio_data *ctx;
ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!iores)
return -ENODEV;
if (!devm_request_mem_region(&pdev->dev, iores->start,
resource_size(iores),
pdev->name))
return -EBUSY;
ctx->mmio = devm_ioremap_nocache(&pdev->dev, iores->start,
resource_size(iores));
if (!ctx->mmio)
return -EBUSY;
dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
if (!dmares)
return -EBUSY;
ctx->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start;
dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1);
if (!dmares)
return -EBUSY;
ctx->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start;
platform_set_drvdata(pdev, ctx);
return snd_soc_register_component(&pdev->dev, &au1xi2s_component,
&au1xi2s_dai_driver, 1);
}
static int au1xi2s_drvremove(struct platform_device *pdev)
{
struct au1xpsc_audio_data *ctx = platform_get_drvdata(pdev);
snd_soc_unregister_component(&pdev->dev);
WR(ctx, I2S_ENABLE, EN_D); /* clock off, disable */
return 0;
}
#ifdef CONFIG_PM
static int au1xi2s_drvsuspend(struct device *dev)
{
struct au1xpsc_audio_data *ctx = dev_get_drvdata(dev);
WR(ctx, I2S_ENABLE, EN_D); /* clock off, disable */
return 0;
}
static int au1xi2s_drvresume(struct device *dev)
{
return 0;
}
static const struct dev_pm_ops au1xi2sc_pmops = {
.suspend = au1xi2s_drvsuspend,
.resume = au1xi2s_drvresume,
};
#define AU1XI2SC_PMOPS (&au1xi2sc_pmops)
#else
#define AU1XI2SC_PMOPS NULL
#endif
static struct platform_driver au1xi2s_driver = {
.driver = {
.name = "alchemy-i2sc",
.pm = AU1XI2SC_PMOPS,
},
.probe = au1xi2s_drvprobe,
.remove = au1xi2s_drvremove,
};
module_platform_driver(au1xi2s_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Au1000/1500/1100 I2S ASoC driver");
MODULE_AUTHOR("Manuel Lauss");