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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* pxa2xx-i2s.c -- ALSA Soc Audio Layer
*
* Copyright 2005 Wolfson Microelectronics PLC.
* Author: Liam Girdwood
* lrg@slimlogic.co.uk
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <sound/pxa2xx-lib.h>
#include <sound/dmaengine_pcm.h>
#include <linux/platform_data/asoc-pxa.h>
#include "pxa2xx-i2s.h"
/*
* I2S Controller Register and Bit Definitions
*/
#define SACR0 (0x0000) /* Global Control Register */
#define SACR1 (0x0004) /* Serial Audio I 2 S/MSB-Justified Control Register */
#define SASR0 (0x000C) /* Serial Audio I 2 S/MSB-Justified Interface and FIFO Status Register */
#define SAIMR (0x0014) /* Serial Audio Interrupt Mask Register */
#define SAICR (0x0018) /* Serial Audio Interrupt Clear Register */
#define SADIV (0x0060) /* Audio Clock Divider Register. */
#define SADR (0x0080) /* Serial Audio Data Register (TX and RX FIFO access Register). */
#define SACR0_RFTH(x) ((x) << 12) /* Rx FIFO Interrupt or DMA Trigger Threshold */
#define SACR0_TFTH(x) ((x) << 8) /* Tx FIFO Interrupt or DMA Trigger Threshold */
#define SACR0_STRF (1 << 5) /* FIFO Select for EFWR Special Function */
#define SACR0_EFWR (1 << 4) /* Enable EFWR Function */
#define SACR0_RST (1 << 3) /* FIFO, i2s Register Reset */
#define SACR0_BCKD (1 << 2) /* Bit Clock Direction */
#define SACR0_ENB (1 << 0) /* Enable I2S Link */
#define SACR1_ENLBF (1 << 5) /* Enable Loopback */
#define SACR1_DRPL (1 << 4) /* Disable Replaying Function */
#define SACR1_DREC (1 << 3) /* Disable Recording Function */
#define SACR1_AMSL (1 << 0) /* Specify Alternate Mode */
#define SASR0_I2SOFF (1 << 7) /* Controller Status */
#define SASR0_ROR (1 << 6) /* Rx FIFO Overrun */
#define SASR0_TUR (1 << 5) /* Tx FIFO Underrun */
#define SASR0_RFS (1 << 4) /* Rx FIFO Service Request */
#define SASR0_TFS (1 << 3) /* Tx FIFO Service Request */
#define SASR0_BSY (1 << 2) /* I2S Busy */
#define SASR0_RNE (1 << 1) /* Rx FIFO Not Empty */
#define SASR0_TNF (1 << 0) /* Tx FIFO Not Empty */
#define SAICR_ROR (1 << 6) /* Clear Rx FIFO Overrun Interrupt */
#define SAICR_TUR (1 << 5) /* Clear Tx FIFO Underrun Interrupt */
#define SAIMR_ROR (1 << 6) /* Enable Rx FIFO Overrun Condition Interrupt */
#define SAIMR_TUR (1 << 5) /* Enable Tx FIFO Underrun Condition Interrupt */
#define SAIMR_RFS (1 << 4) /* Enable Rx FIFO Service Interrupt */
#define SAIMR_TFS (1 << 3) /* Enable Tx FIFO Service Interrupt */
struct pxa_i2s_port {
u32 sadiv;
u32 sacr0;
u32 sacr1;
u32 saimr;
int master;
u32 fmt;
};
static struct pxa_i2s_port pxa_i2s;
static struct clk *clk_i2s;
static int clk_ena = 0;
static void __iomem *i2s_reg_base;
static struct snd_dmaengine_dai_dma_data pxa2xx_i2s_pcm_stereo_out = {
.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
.chan_name = "tx",
.maxburst = 32,
};
static struct snd_dmaengine_dai_dma_data pxa2xx_i2s_pcm_stereo_in = {
.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
.chan_name = "rx",
.maxburst = 32,
};
static int pxa2xx_i2s_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
if (IS_ERR(clk_i2s))
return PTR_ERR(clk_i2s);
if (!snd_soc_dai_active(cpu_dai))
writel(0, i2s_reg_base + SACR0);
return 0;
}
/* wait for I2S controller to be ready */
static int pxa_i2s_wait(void)
{
int i;
/* flush the Rx FIFO */
for (i = 0; i < 16; i++)
readl(i2s_reg_base + SADR);
return 0;
}
static int pxa2xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
unsigned int fmt)
{
/* interface format */
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
pxa_i2s.fmt = 0;
break;
case SND_SOC_DAIFMT_LEFT_J:
pxa_i2s.fmt = SACR1_AMSL;
break;
}
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBS_CFS:
pxa_i2s.master = 1;
break;
case SND_SOC_DAIFMT_CBM_CFS:
pxa_i2s.master = 0;
break;
default:
break;
}
return 0;
}
static int pxa2xx_i2s_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
int clk_id, unsigned int freq, int dir)
{
if (clk_id != PXA2XX_I2S_SYSCLK)
return -ENODEV;
return 0;
}
static int pxa2xx_i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_dmaengine_dai_dma_data *dma_data;
if (WARN_ON(IS_ERR(clk_i2s)))
return -EINVAL;
clk_prepare_enable(clk_i2s);
clk_ena = 1;
pxa_i2s_wait();
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
dma_data = &pxa2xx_i2s_pcm_stereo_out;
else
dma_data = &pxa2xx_i2s_pcm_stereo_in;
snd_soc_dai_set_dma_data(dai, substream, dma_data);
/* is port used by another stream */
if (!(SACR0 & SACR0_ENB)) {
writel(0, i2s_reg_base + SACR0);
if (pxa_i2s.master)
writel(readl(i2s_reg_base + SACR0) | (SACR0_BCKD), i2s_reg_base + SACR0);
writel(readl(i2s_reg_base + SACR0) | (SACR0_RFTH(14) | SACR0_TFTH(1)), i2s_reg_base + SACR0);
writel(readl(i2s_reg_base + SACR1) | (pxa_i2s.fmt), i2s_reg_base + SACR1);
}
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
writel(readl(i2s_reg_base + SAIMR) | (SAIMR_TFS), i2s_reg_base + SAIMR);
else
writel(readl(i2s_reg_base + SAIMR) | (SAIMR_RFS), i2s_reg_base + SAIMR);
switch (params_rate(params)) {
case 8000:
writel(0x48, i2s_reg_base + SADIV);
break;
case 11025:
writel(0x34, i2s_reg_base + SADIV);
break;
case 16000:
writel(0x24, i2s_reg_base + SADIV);
break;
case 22050:
writel(0x1a, i2s_reg_base + SADIV);
break;
case 44100:
writel(0xd, i2s_reg_base + SADIV);
break;
case 48000:
writel(0xc, i2s_reg_base + SADIV);
break;
case 96000: /* not in manual and possibly slightly inaccurate */
writel(0x6, i2s_reg_base + SADIV);
break;
}
return 0;
}
static int pxa2xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
int ret = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
writel(readl(i2s_reg_base + SACR1) & (~SACR1_DRPL), i2s_reg_base + SACR1);
else
writel(readl(i2s_reg_base + SACR1) & (~SACR1_DREC), i2s_reg_base + SACR1);
writel(readl(i2s_reg_base + SACR0) | (SACR0_ENB), i2s_reg_base + SACR0);
break;
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
break;
default:
ret = -EINVAL;
}
return ret;
}
static void pxa2xx_i2s_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
writel(readl(i2s_reg_base + SACR1) | (SACR1_DRPL), i2s_reg_base + SACR1);
writel(readl(i2s_reg_base + SAIMR) & (~SAIMR_TFS), i2s_reg_base + SAIMR);
} else {
writel(readl(i2s_reg_base + SACR1) | (SACR1_DREC), i2s_reg_base + SACR1);
writel(readl(i2s_reg_base + SAIMR) & (~SAIMR_RFS), i2s_reg_base + SAIMR);
}
if ((readl(i2s_reg_base + SACR1) & (SACR1_DREC | SACR1_DRPL)) == (SACR1_DREC | SACR1_DRPL)) {
writel(readl(i2s_reg_base + SACR0) & (~SACR0_ENB), i2s_reg_base + SACR0);
pxa_i2s_wait();
if (clk_ena) {
clk_disable_unprepare(clk_i2s);
clk_ena = 0;
}
}
}
#ifdef CONFIG_PM
static int pxa2xx_soc_pcm_suspend(struct snd_soc_component *component)
{
/* store registers */
pxa_i2s.sacr0 = readl(i2s_reg_base + SACR0);
pxa_i2s.sacr1 = readl(i2s_reg_base + SACR1);
pxa_i2s.saimr = readl(i2s_reg_base + SAIMR);
pxa_i2s.sadiv = readl(i2s_reg_base + SADIV);
/* deactivate link */
writel(readl(i2s_reg_base + SACR0) & (~SACR0_ENB), i2s_reg_base + SACR0);
pxa_i2s_wait();
return 0;
}
static int pxa2xx_soc_pcm_resume(struct snd_soc_component *component)
{
pxa_i2s_wait();
writel(pxa_i2s.sacr0 & ~SACR0_ENB, i2s_reg_base + SACR0);
writel(pxa_i2s.sacr1, i2s_reg_base + SACR1);
writel(pxa_i2s.saimr, i2s_reg_base + SAIMR);
writel(pxa_i2s.sadiv, i2s_reg_base + SADIV);
writel(pxa_i2s.sacr0, i2s_reg_base + SACR0);
return 0;
}
#else
#define pxa2xx_soc_pcm_suspend NULL
#define pxa2xx_soc_pcm_resume NULL
#endif
static int pxa2xx_i2s_probe(struct snd_soc_dai *dai)
{
clk_i2s = clk_get(dai->dev, "I2SCLK");
if (IS_ERR(clk_i2s))
return PTR_ERR(clk_i2s);
/*
* PXA Developer's Manual:
* If SACR0[ENB] is toggled in the middle of a normal operation,
* the SACR0[RST] bit must also be set and cleared to reset all
* I2S controller registers.
*/
writel(SACR0_RST, i2s_reg_base + SACR0);
writel(0, i2s_reg_base + SACR0);
/* Make sure RPL and REC are disabled */
writel(SACR1_DRPL | SACR1_DREC, i2s_reg_base + SACR1);
/* Along with FIFO servicing */
writel(readl(i2s_reg_base + SAIMR) & (~(SAIMR_RFS | SAIMR_TFS)), i2s_reg_base + SAIMR);
snd_soc_dai_init_dma_data(dai, &pxa2xx_i2s_pcm_stereo_out,
&pxa2xx_i2s_pcm_stereo_in);
return 0;
}
static int pxa2xx_i2s_remove(struct snd_soc_dai *dai)
{
clk_put(clk_i2s);
clk_i2s = ERR_PTR(-ENOENT);
return 0;
}
#define PXA2XX_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
static const struct snd_soc_dai_ops pxa_i2s_dai_ops = {
.startup = pxa2xx_i2s_startup,
.shutdown = pxa2xx_i2s_shutdown,
.trigger = pxa2xx_i2s_trigger,
.hw_params = pxa2xx_i2s_hw_params,
.set_fmt = pxa2xx_i2s_set_dai_fmt,
.set_sysclk = pxa2xx_i2s_set_dai_sysclk,
};
static struct snd_soc_dai_driver pxa_i2s_dai = {
.probe = pxa2xx_i2s_probe,
.remove = pxa2xx_i2s_remove,
.playback = {
.channels_min = 2,
.channels_max = 2,
.rates = PXA2XX_I2S_RATES,
.formats = SNDRV_PCM_FMTBIT_S16_LE,},
.capture = {
.channels_min = 2,
.channels_max = 2,
.rates = PXA2XX_I2S_RATES,
.formats = SNDRV_PCM_FMTBIT_S16_LE,},
.ops = &pxa_i2s_dai_ops,
.symmetric_rate = 1,
};
static const struct snd_soc_component_driver pxa_i2s_component = {
.name = "pxa-i2s",
.pcm_construct = pxa2xx_soc_pcm_new,
.open = pxa2xx_soc_pcm_open,
.close = pxa2xx_soc_pcm_close,
.hw_params = pxa2xx_soc_pcm_hw_params,
.prepare = pxa2xx_soc_pcm_prepare,
.trigger = pxa2xx_soc_pcm_trigger,
.pointer = pxa2xx_soc_pcm_pointer,
.suspend = pxa2xx_soc_pcm_suspend,
.resume = pxa2xx_soc_pcm_resume,
};
static int pxa2xx_i2s_drv_probe(struct platform_device *pdev)
{
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "missing MMIO resource\n");
return -ENXIO;
}
i2s_reg_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(i2s_reg_base)) {
dev_err(&pdev->dev, "ioremap failed\n");
return PTR_ERR(i2s_reg_base);
}
pxa2xx_i2s_pcm_stereo_out.addr = res->start + SADR;
pxa2xx_i2s_pcm_stereo_in.addr = res->start + SADR;
return devm_snd_soc_register_component(&pdev->dev, &pxa_i2s_component,
&pxa_i2s_dai, 1);
}
static struct platform_driver pxa2xx_i2s_driver = {
.probe = pxa2xx_i2s_drv_probe,
.driver = {
.name = "pxa2xx-i2s",
},
};
static int __init pxa2xx_i2s_init(void)
{
clk_i2s = ERR_PTR(-ENOENT);
return platform_driver_register(&pxa2xx_i2s_driver);
}
static void __exit pxa2xx_i2s_exit(void)
{
platform_driver_unregister(&pxa2xx_i2s_driver);
}
module_init(pxa2xx_i2s_init);
module_exit(pxa2xx_i2s_exit);
/* Module information */
MODULE_AUTHOR("Liam Girdwood, lrg@slimlogic.co.uk");
MODULE_DESCRIPTION("pxa2xx I2S SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pxa2xx-i2s");