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linux/sound/soc/sunxi/sun4i-spdif.c
Marcus Cooper 2f6963cb52 ASoC: sunxi: compatibility for sun6i to SPDIF 
The A31 SoC uses the same SPDIF block as found in earlier SoCs, but its
reset is controlled via a separate reset controller.

The DMA also complains when the maxburst is set to 4 so it's been adjusted
to 8 which suites both the older and newer SoCs.

Signed-off-by: Marcus Cooper <codekipper@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-08-12 12:00:34 +01:00

566 lines
16 KiB
C
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/*
* ALSA SoC SPDIF Audio Layer
*
* Copyright 2015 Andrea Venturi <be17068@iperbole.bo.it>
* Copyright 2015 Marcus Cooper <codekipper@gmail.com>
*
* Based on the Allwinner SDK driver, released under the GPL.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/regmap.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#define SUN4I_SPDIF_CTL (0x00)
#define SUN4I_SPDIF_CTL_MCLKDIV(v) ((v) << 4) /* v even */
#define SUN4I_SPDIF_CTL_MCLKOUTEN BIT(2)
#define SUN4I_SPDIF_CTL_GEN BIT(1)
#define SUN4I_SPDIF_CTL_RESET BIT(0)
#define SUN4I_SPDIF_TXCFG (0x04)
#define SUN4I_SPDIF_TXCFG_SINGLEMOD BIT(31)
#define SUN4I_SPDIF_TXCFG_ASS BIT(17)
#define SUN4I_SPDIF_TXCFG_NONAUDIO BIT(16)
#define SUN4I_SPDIF_TXCFG_TXRATIO(v) ((v) << 4)
#define SUN4I_SPDIF_TXCFG_TXRATIO_MASK GENMASK(8, 4)
#define SUN4I_SPDIF_TXCFG_FMTRVD GENMASK(3, 2)
#define SUN4I_SPDIF_TXCFG_FMT16BIT (0 << 2)
#define SUN4I_SPDIF_TXCFG_FMT20BIT (1 << 2)
#define SUN4I_SPDIF_TXCFG_FMT24BIT (2 << 2)
#define SUN4I_SPDIF_TXCFG_CHSTMODE BIT(1)
#define SUN4I_SPDIF_TXCFG_TXEN BIT(0)
#define SUN4I_SPDIF_RXCFG (0x08)
#define SUN4I_SPDIF_RXCFG_LOCKFLAG BIT(4)
#define SUN4I_SPDIF_RXCFG_CHSTSRC BIT(3)
#define SUN4I_SPDIF_RXCFG_CHSTCP BIT(1)
#define SUN4I_SPDIF_RXCFG_RXEN BIT(0)
#define SUN4I_SPDIF_TXFIFO (0x0C)
#define SUN4I_SPDIF_RXFIFO (0x10)
#define SUN4I_SPDIF_FCTL (0x14)
#define SUN4I_SPDIF_FCTL_FIFOSRC BIT(31)
#define SUN4I_SPDIF_FCTL_FTX BIT(17)
#define SUN4I_SPDIF_FCTL_FRX BIT(16)
#define SUN4I_SPDIF_FCTL_TXTL(v) ((v) << 8)
#define SUN4I_SPDIF_FCTL_TXTL_MASK GENMASK(12, 8)
#define SUN4I_SPDIF_FCTL_RXTL(v) ((v) << 3)
#define SUN4I_SPDIF_FCTL_RXTL_MASK GENMASK(7, 3)
#define SUN4I_SPDIF_FCTL_TXIM BIT(2)
#define SUN4I_SPDIF_FCTL_RXOM(v) ((v) << 0)
#define SUN4I_SPDIF_FCTL_RXOM_MASK GENMASK(1, 0)
#define SUN4I_SPDIF_FSTA (0x18)
#define SUN4I_SPDIF_FSTA_TXE BIT(14)
#define SUN4I_SPDIF_FSTA_TXECNTSHT (8)
#define SUN4I_SPDIF_FSTA_RXA BIT(6)
#define SUN4I_SPDIF_FSTA_RXACNTSHT (0)
#define SUN4I_SPDIF_INT (0x1C)
#define SUN4I_SPDIF_INT_RXLOCKEN BIT(18)
#define SUN4I_SPDIF_INT_RXUNLOCKEN BIT(17)
#define SUN4I_SPDIF_INT_RXPARERREN BIT(16)
#define SUN4I_SPDIF_INT_TXDRQEN BIT(7)
#define SUN4I_SPDIF_INT_TXUIEN BIT(6)
#define SUN4I_SPDIF_INT_TXOIEN BIT(5)
#define SUN4I_SPDIF_INT_TXEIEN BIT(4)
#define SUN4I_SPDIF_INT_RXDRQEN BIT(2)
#define SUN4I_SPDIF_INT_RXOIEN BIT(1)
#define SUN4I_SPDIF_INT_RXAIEN BIT(0)
#define SUN4I_SPDIF_ISTA (0x20)
#define SUN4I_SPDIF_ISTA_RXLOCKSTA BIT(18)
#define SUN4I_SPDIF_ISTA_RXUNLOCKSTA BIT(17)
#define SUN4I_SPDIF_ISTA_RXPARERRSTA BIT(16)
#define SUN4I_SPDIF_ISTA_TXUSTA BIT(6)
#define SUN4I_SPDIF_ISTA_TXOSTA BIT(5)
#define SUN4I_SPDIF_ISTA_TXESTA BIT(4)
#define SUN4I_SPDIF_ISTA_RXOSTA BIT(1)
#define SUN4I_SPDIF_ISTA_RXASTA BIT(0)
#define SUN4I_SPDIF_TXCNT (0x24)
#define SUN4I_SPDIF_RXCNT (0x28)
#define SUN4I_SPDIF_TXCHSTA0 (0x2C)
#define SUN4I_SPDIF_TXCHSTA0_CLK(v) ((v) << 28)
#define SUN4I_SPDIF_TXCHSTA0_SAMFREQ(v) ((v) << 24)
#define SUN4I_SPDIF_TXCHSTA0_SAMFREQ_MASK GENMASK(27, 24)
#define SUN4I_SPDIF_TXCHSTA0_CHNUM(v) ((v) << 20)
#define SUN4I_SPDIF_TXCHSTA0_CHNUM_MASK GENMASK(23, 20)
#define SUN4I_SPDIF_TXCHSTA0_SRCNUM(v) ((v) << 16)
#define SUN4I_SPDIF_TXCHSTA0_CATACOD(v) ((v) << 8)
#define SUN4I_SPDIF_TXCHSTA0_MODE(v) ((v) << 6)
#define SUN4I_SPDIF_TXCHSTA0_EMPHASIS(v) ((v) << 3)
#define SUN4I_SPDIF_TXCHSTA0_CP BIT(2)
#define SUN4I_SPDIF_TXCHSTA0_AUDIO BIT(1)
#define SUN4I_SPDIF_TXCHSTA0_PRO BIT(0)
#define SUN4I_SPDIF_TXCHSTA1 (0x30)
#define SUN4I_SPDIF_TXCHSTA1_CGMSA(v) ((v) << 8)
#define SUN4I_SPDIF_TXCHSTA1_ORISAMFREQ(v) ((v) << 4)
#define SUN4I_SPDIF_TXCHSTA1_ORISAMFREQ_MASK GENMASK(7, 4)
#define SUN4I_SPDIF_TXCHSTA1_SAMWORDLEN(v) ((v) << 1)
#define SUN4I_SPDIF_TXCHSTA1_MAXWORDLEN BIT(0)
#define SUN4I_SPDIF_RXCHSTA0 (0x34)
#define SUN4I_SPDIF_RXCHSTA0_CLK(v) ((v) << 28)
#define SUN4I_SPDIF_RXCHSTA0_SAMFREQ(v) ((v) << 24)
#define SUN4I_SPDIF_RXCHSTA0_CHNUM(v) ((v) << 20)
#define SUN4I_SPDIF_RXCHSTA0_SRCNUM(v) ((v) << 16)
#define SUN4I_SPDIF_RXCHSTA0_CATACOD(v) ((v) << 8)
#define SUN4I_SPDIF_RXCHSTA0_MODE(v) ((v) << 6)
#define SUN4I_SPDIF_RXCHSTA0_EMPHASIS(v) ((v) << 3)
#define SUN4I_SPDIF_RXCHSTA0_CP BIT(2)
#define SUN4I_SPDIF_RXCHSTA0_AUDIO BIT(1)
#define SUN4I_SPDIF_RXCHSTA0_PRO BIT(0)
#define SUN4I_SPDIF_RXCHSTA1 (0x38)
#define SUN4I_SPDIF_RXCHSTA1_CGMSA(v) ((v) << 8)
#define SUN4I_SPDIF_RXCHSTA1_ORISAMFREQ(v) ((v) << 4)
#define SUN4I_SPDIF_RXCHSTA1_SAMWORDLEN(v) ((v) << 1)
#define SUN4I_SPDIF_RXCHSTA1_MAXWORDLEN BIT(0)
/* Defines for Sampling Frequency */
#define SUN4I_SPDIF_SAMFREQ_44_1KHZ 0x0
#define SUN4I_SPDIF_SAMFREQ_NOT_INDICATED 0x1
#define SUN4I_SPDIF_SAMFREQ_48KHZ 0x2
#define SUN4I_SPDIF_SAMFREQ_32KHZ 0x3
#define SUN4I_SPDIF_SAMFREQ_22_05KHZ 0x4
#define SUN4I_SPDIF_SAMFREQ_24KHZ 0x6
#define SUN4I_SPDIF_SAMFREQ_88_2KHZ 0x8
#define SUN4I_SPDIF_SAMFREQ_76_8KHZ 0x9
#define SUN4I_SPDIF_SAMFREQ_96KHZ 0xa
#define SUN4I_SPDIF_SAMFREQ_176_4KHZ 0xc
#define SUN4I_SPDIF_SAMFREQ_192KHZ 0xe
struct sun4i_spdif_dev {
struct platform_device *pdev;
struct clk *spdif_clk;
struct clk *apb_clk;
struct reset_control *rst;
struct snd_soc_dai_driver cpu_dai_drv;
struct regmap *regmap;
struct snd_dmaengine_dai_dma_data dma_params_tx;
};
static void sun4i_spdif_configure(struct sun4i_spdif_dev *host)
{
/* soft reset SPDIF */
regmap_write(host->regmap, SUN4I_SPDIF_CTL, SUN4I_SPDIF_CTL_RESET);
/* flush TX FIFO */
regmap_update_bits(host->regmap, SUN4I_SPDIF_FCTL,
SUN4I_SPDIF_FCTL_FTX, SUN4I_SPDIF_FCTL_FTX);
/* clear TX counter */
regmap_write(host->regmap, SUN4I_SPDIF_TXCNT, 0);
}
static void sun4i_snd_txctrl_on(struct snd_pcm_substream *substream,
struct sun4i_spdif_dev *host)
{
if (substream->runtime->channels == 1)
regmap_update_bits(host->regmap, SUN4I_SPDIF_TXCFG,
SUN4I_SPDIF_TXCFG_SINGLEMOD,
SUN4I_SPDIF_TXCFG_SINGLEMOD);
/* SPDIF TX ENABLE */
regmap_update_bits(host->regmap, SUN4I_SPDIF_TXCFG,
SUN4I_SPDIF_TXCFG_TXEN, SUN4I_SPDIF_TXCFG_TXEN);
/* DRQ ENABLE */
regmap_update_bits(host->regmap, SUN4I_SPDIF_INT,
SUN4I_SPDIF_INT_TXDRQEN, SUN4I_SPDIF_INT_TXDRQEN);
/* Global enable */
regmap_update_bits(host->regmap, SUN4I_SPDIF_CTL,
SUN4I_SPDIF_CTL_GEN, SUN4I_SPDIF_CTL_GEN);
}
static void sun4i_snd_txctrl_off(struct snd_pcm_substream *substream,
struct sun4i_spdif_dev *host)
{
/* SPDIF TX DISABLE */
regmap_update_bits(host->regmap, SUN4I_SPDIF_TXCFG,
SUN4I_SPDIF_TXCFG_TXEN, 0);
/* DRQ DISABLE */
regmap_update_bits(host->regmap, SUN4I_SPDIF_INT,
SUN4I_SPDIF_INT_TXDRQEN, 0);
/* Global disable */
regmap_update_bits(host->regmap, SUN4I_SPDIF_CTL,
SUN4I_SPDIF_CTL_GEN, 0);
}
static int sun4i_spdif_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct sun4i_spdif_dev *host = snd_soc_dai_get_drvdata(rtd->cpu_dai);
if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
return -EINVAL;
sun4i_spdif_configure(host);
return 0;
}
static int sun4i_spdif_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *cpu_dai)
{
int ret = 0;
int fmt;
unsigned long rate = params_rate(params);
u32 mclk_div = 0;
unsigned int mclk = 0;
u32 reg_val;
struct sun4i_spdif_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
struct platform_device *pdev = host->pdev;
/* Add the PCM and raw data select interface */
switch (params_channels(params)) {
case 1: /* PCM mode */
case 2:
fmt = 0;
break;
case 4: /* raw data mode */
fmt = SUN4I_SPDIF_TXCFG_NONAUDIO;
break;
default:
return -EINVAL;
}
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
fmt |= SUN4I_SPDIF_TXCFG_FMT16BIT;
break;
case SNDRV_PCM_FORMAT_S20_3LE:
fmt |= SUN4I_SPDIF_TXCFG_FMT20BIT;
break;
case SNDRV_PCM_FORMAT_S24_LE:
fmt |= SUN4I_SPDIF_TXCFG_FMT24BIT;
break;
default:
return -EINVAL;
}
switch (rate) {
case 22050:
case 44100:
case 88200:
case 176400:
mclk = 22579200;
break;
case 24000:
case 32000:
case 48000:
case 96000:
case 192000:
mclk = 24576000;
break;
default:
return -EINVAL;
}
ret = clk_set_rate(host->spdif_clk, mclk);
if (ret < 0) {
dev_err(&pdev->dev,
"Setting SPDIF clock rate for %d Hz failed!\n", mclk);
return ret;
}
regmap_update_bits(host->regmap, SUN4I_SPDIF_FCTL,
SUN4I_SPDIF_FCTL_TXIM, SUN4I_SPDIF_FCTL_TXIM);
switch (rate) {
case 22050:
case 24000:
mclk_div = 8;
break;
case 32000:
mclk_div = 6;
break;
case 44100:
case 48000:
mclk_div = 4;
break;
case 88200:
case 96000:
mclk_div = 2;
break;
case 176400:
case 192000:
mclk_div = 1;
break;
default:
return -EINVAL;
}
reg_val = 0;
reg_val |= SUN4I_SPDIF_TXCFG_ASS;
reg_val |= fmt; /* set non audio and bit depth */
reg_val |= SUN4I_SPDIF_TXCFG_CHSTMODE;
reg_val |= SUN4I_SPDIF_TXCFG_TXRATIO(mclk_div - 1);
regmap_write(host->regmap, SUN4I_SPDIF_TXCFG, reg_val);
return 0;
}
static int sun4i_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
int ret = 0;
struct sun4i_spdif_dev *host = snd_soc_dai_get_drvdata(dai);
if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
return -EINVAL;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
sun4i_snd_txctrl_on(substream, host);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
sun4i_snd_txctrl_off(substream, host);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int sun4i_spdif_soc_dai_probe(struct snd_soc_dai *dai)
{
struct sun4i_spdif_dev *host = snd_soc_dai_get_drvdata(dai);
snd_soc_dai_init_dma_data(dai, &host->dma_params_tx, NULL);
return 0;
}
static const struct snd_soc_dai_ops sun4i_spdif_dai_ops = {
.startup = sun4i_spdif_startup,
.trigger = sun4i_spdif_trigger,
.hw_params = sun4i_spdif_hw_params,
};
static const struct regmap_config sun4i_spdif_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = SUN4I_SPDIF_RXCHSTA1,
};
#define SUN4I_RATES SNDRV_PCM_RATE_8000_192000
#define SUN4I_FORMATS (SNDRV_PCM_FORMAT_S16_LE | \
SNDRV_PCM_FORMAT_S20_3LE | \
SNDRV_PCM_FORMAT_S24_LE)
static struct snd_soc_dai_driver sun4i_spdif_dai = {
.playback = {
.channels_min = 1,
.channels_max = 2,
.rates = SUN4I_RATES,
.formats = SUN4I_FORMATS,
},
.probe = sun4i_spdif_soc_dai_probe,
.ops = &sun4i_spdif_dai_ops,
.name = "spdif",
};
static const struct snd_soc_dapm_widget dit_widgets[] = {
SND_SOC_DAPM_OUTPUT("spdif-out"),
};
static const struct snd_soc_dapm_route dit_routes[] = {
{ "spdif-out", NULL, "Playback" },
};
static const struct of_device_id sun4i_spdif_of_match[] = {
{ .compatible = "allwinner,sun4i-a10-spdif", },
{ .compatible = "allwinner,sun6i-a31-spdif", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sun4i_spdif_of_match);
static const struct snd_soc_component_driver sun4i_spdif_component = {
.name = "sun4i-spdif",
};
static int sun4i_spdif_runtime_suspend(struct device *dev)
{
struct sun4i_spdif_dev *host = dev_get_drvdata(dev);
clk_disable_unprepare(host->spdif_clk);
clk_disable_unprepare(host->apb_clk);
return 0;
}
static int sun4i_spdif_runtime_resume(struct device *dev)
{
struct sun4i_spdif_dev *host = dev_get_drvdata(dev);
clk_prepare_enable(host->spdif_clk);
clk_prepare_enable(host->apb_clk);
return 0;
}
static int sun4i_spdif_probe(struct platform_device *pdev)
{
struct sun4i_spdif_dev *host;
struct resource *res;
int ret;
void __iomem *base;
dev_dbg(&pdev->dev, "Entered %s\n", __func__);
host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
if (!host)
return -ENOMEM;
host->pdev = pdev;
/* Initialize this copy of the CPU DAI driver structure */
memcpy(&host->cpu_dai_drv, &sun4i_spdif_dai, sizeof(sun4i_spdif_dai));
host->cpu_dai_drv.name = dev_name(&pdev->dev);
/* Get the addresses */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
host->regmap = devm_regmap_init_mmio(&pdev->dev, base,
&sun4i_spdif_regmap_config);
/* Clocks */
host->apb_clk = devm_clk_get(&pdev->dev, "apb");
if (IS_ERR(host->apb_clk)) {
dev_err(&pdev->dev, "failed to get a apb clock.\n");
return PTR_ERR(host->apb_clk);
}
host->spdif_clk = devm_clk_get(&pdev->dev, "spdif");
if (IS_ERR(host->spdif_clk)) {
dev_err(&pdev->dev, "failed to get a spdif clock.\n");
ret = PTR_ERR(host->spdif_clk);
goto err_disable_apb_clk;
}
host->dma_params_tx.addr = res->start + SUN4I_SPDIF_TXFIFO;
host->dma_params_tx.maxburst = 8;
host->dma_params_tx.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
platform_set_drvdata(pdev, host);
if (of_device_is_compatible(pdev->dev.of_node,
"allwinner,sun6i-a31-spdif")) {
host->rst = devm_reset_control_get_optional(&pdev->dev, NULL);
if (IS_ERR(host->rst) && PTR_ERR(host->rst) == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
dev_err(&pdev->dev, "Failed to get reset: %d\n", ret);
goto err_disable_apb_clk;
}
if (!IS_ERR(host->rst))
reset_control_deassert(host->rst);
}
ret = devm_snd_soc_register_component(&pdev->dev,
&sun4i_spdif_component, &sun4i_spdif_dai, 1);
if (ret)
goto err_disable_apb_clk;
pm_runtime_enable(&pdev->dev);
if (!pm_runtime_enabled(&pdev->dev)) {
ret = sun4i_spdif_runtime_resume(&pdev->dev);
if (ret)
goto err_unregister;
}
ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
if (ret)
goto err_suspend;
return 0;
err_suspend:
if (!pm_runtime_status_suspended(&pdev->dev))
sun4i_spdif_runtime_suspend(&pdev->dev);
err_unregister:
pm_runtime_disable(&pdev->dev);
snd_soc_unregister_component(&pdev->dev);
err_disable_apb_clk:
clk_disable_unprepare(host->apb_clk);
return ret;
}
static int sun4i_spdif_remove(struct platform_device *pdev)
{
pm_runtime_disable(&pdev->dev);
if (!pm_runtime_status_suspended(&pdev->dev))
sun4i_spdif_runtime_suspend(&pdev->dev);
snd_soc_unregister_platform(&pdev->dev);
snd_soc_unregister_component(&pdev->dev);
return 0;
}
static const struct dev_pm_ops sun4i_spdif_pm = {
SET_RUNTIME_PM_OPS(sun4i_spdif_runtime_suspend,
sun4i_spdif_runtime_resume, NULL)
};
static struct platform_driver sun4i_spdif_driver = {
.driver = {
.name = "sun4i-spdif",
.of_match_table = of_match_ptr(sun4i_spdif_of_match),
.pm = &sun4i_spdif_pm,
},
.probe = sun4i_spdif_probe,
.remove = sun4i_spdif_remove,
};
module_platform_driver(sun4i_spdif_driver);
MODULE_AUTHOR("Marcus Cooper <codekipper@gmail.com>");
MODULE_AUTHOR("Andrea Venturi <be17068@iperbole.bo.it>");
MODULE_DESCRIPTION("Allwinner sun4i SPDIF SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:sun4i-spdif");
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