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Diffstat (limited to '')
| -rw-r--r-- | sound/soc/samsung/s3c24xx_uda134x.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/sound/soc/samsung/s3c24xx_uda134x.c b/sound/soc/samsung/s3c24xx_uda134x.c new file mode 100644 index 000000000..6272070dc --- /dev/null +++ b/sound/soc/samsung/s3c24xx_uda134x.c @@ -0,0 +1,257 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Modifications by Christian Pellegrin <chripell@evolware.org> +// +// s3c24xx_uda134x.c - S3C24XX_UDA134X ALSA SoC Audio board driver +// +// Copyright 2007 Dension Audio Systems Ltd. +// Author: Zoltan Devai + +#include <linux/clk.h> +#include <linux/gpio.h> +#include <linux/module.h> + +#include <sound/soc.h> +#include <sound/s3c24xx_uda134x.h> + +#include "regs-iis.h" +#include "s3c24xx-i2s.h" + +struct s3c24xx_uda134x { + struct clk *xtal; + struct clk *pclk; + struct mutex clk_lock; + int clk_users; +}; + +/* #define ENFORCE_RATES 1 */ +/* + Unfortunately the S3C24XX in master mode has a limited capacity of + generating the clock for the codec. If you define this only rates + that are really available will be enforced. But be careful, most + user level application just want the usual sampling frequencies (8, + 11.025, 22.050, 44.1 kHz) and anyway resampling is a costly + operation for embedded systems. So if you aren't very lucky or your + hardware engineer wasn't very forward-looking it's better to leave + this undefined. If you do so an approximate value for the requested + sampling rate in the range -/+ 5% will be chosen. If this in not + possible an error will be returned. +*/ + +static unsigned int rates[33 * 2]; +#ifdef ENFORCE_RATES +static const struct snd_pcm_hw_constraint_list hw_constraints_rates = { + .count = ARRAY_SIZE(rates), + .list = rates, + .mask = 0, +}; +#endif + +static int s3c24xx_uda134x_startup(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct s3c24xx_uda134x *priv = snd_soc_card_get_drvdata(rtd->card); + struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0); + int ret = 0; + + mutex_lock(&priv->clk_lock); + + if (priv->clk_users == 0) { + priv->xtal = clk_get(rtd->dev, "xtal"); + if (IS_ERR(priv->xtal)) { + dev_err(rtd->dev, "%s cannot get xtal\n", __func__); + ret = PTR_ERR(priv->xtal); + } else { + priv->pclk = clk_get(cpu_dai->dev, "iis"); + if (IS_ERR(priv->pclk)) { + dev_err(rtd->dev, "%s cannot get pclk\n", + __func__); + clk_put(priv->xtal); + ret = PTR_ERR(priv->pclk); + } + } + if (!ret) { + int i, j; + + for (i = 0; i < 2; i++) { + int fs = i ? 256 : 384; + + rates[i*33] = clk_get_rate(priv->xtal) / fs; + for (j = 1; j < 33; j++) + rates[i*33 + j] = clk_get_rate(priv->pclk) / + (j * fs); + } + } + } + priv->clk_users += 1; + mutex_unlock(&priv->clk_lock); + + if (!ret) { +#ifdef ENFORCE_RATES + ret = snd_pcm_hw_constraint_list(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_RATE, + &hw_constraints_rates); + if (ret < 0) + dev_err(rtd->dev, "%s cannot set constraints\n", + __func__); +#endif + } + return ret; +} + +static void s3c24xx_uda134x_shutdown(struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct s3c24xx_uda134x *priv = snd_soc_card_get_drvdata(rtd->card); + + mutex_lock(&priv->clk_lock); + priv->clk_users -= 1; + if (priv->clk_users == 0) { + clk_put(priv->xtal); + priv->xtal = NULL; + clk_put(priv->pclk); + priv->pclk = NULL; + } + mutex_unlock(&priv->clk_lock); +} + +static int s3c24xx_uda134x_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0); + struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0); + unsigned int clk = 0; + int ret = 0; + int clk_source, fs_mode; + unsigned long rate = params_rate(params); + long err, cerr; + unsigned int div; + int i, bi; + + err = 999999; + bi = 0; + for (i = 0; i < 2*33; i++) { + cerr = rates[i] - rate; + if (cerr < 0) + cerr = -cerr; + if (cerr < err) { + err = cerr; + bi = i; + } + } + if (bi / 33 == 1) + fs_mode = S3C2410_IISMOD_256FS; + else + fs_mode = S3C2410_IISMOD_384FS; + if (bi % 33 == 0) { + clk_source = S3C24XX_CLKSRC_MPLL; + div = 1; + } else { + clk_source = S3C24XX_CLKSRC_PCLK; + div = bi % 33; + } + + dev_dbg(rtd->dev, "%s desired rate %lu, %d\n", __func__, rate, bi); + + clk = (fs_mode == S3C2410_IISMOD_384FS ? 384 : 256) * rate; + + dev_dbg(rtd->dev, "%s will use: %s %s %d sysclk %d err %ld\n", __func__, + fs_mode == S3C2410_IISMOD_384FS ? "384FS" : "256FS", + clk_source == S3C24XX_CLKSRC_MPLL ? "MPLLin" : "PCLK", + div, clk, err); + + if ((err * 100 / rate) > 5) { + dev_err(rtd->dev, "effective frequency too different " + "from desired (%ld%%)\n", err * 100 / rate); + return -EINVAL; + } + + ret = snd_soc_dai_set_sysclk(cpu_dai, clk_source , clk, + SND_SOC_CLOCK_IN); + if (ret < 0) + return ret; + + ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_MCLK, fs_mode); + if (ret < 0) + return ret; + + ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_BCLK, + S3C2410_IISMOD_32FS); + if (ret < 0) + return ret; + + ret = snd_soc_dai_set_clkdiv(cpu_dai, S3C24XX_DIV_PRESCALER, + S3C24XX_PRESCALE(div, div)); + if (ret < 0) + return ret; + + /* set the codec system clock for DAC and ADC */ + ret = snd_soc_dai_set_sysclk(codec_dai, 0, clk, + SND_SOC_CLOCK_OUT); + if (ret < 0) + return ret; + + return 0; +} + +static const struct snd_soc_ops s3c24xx_uda134x_ops = { + .startup = s3c24xx_uda134x_startup, + .shutdown = s3c24xx_uda134x_shutdown, + .hw_params = s3c24xx_uda134x_hw_params, +}; + +SND_SOC_DAILINK_DEFS(uda134x, + DAILINK_COMP_ARRAY(COMP_CPU("s3c24xx-iis")), + DAILINK_COMP_ARRAY(COMP_CODEC("uda134x-codec", "uda134x-hifi")), + DAILINK_COMP_ARRAY(COMP_PLATFORM("s3c24xx-iis"))); + +static struct snd_soc_dai_link s3c24xx_uda134x_dai_link = { + .name = "UDA134X", + .stream_name = "UDA134X", + .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | + SND_SOC_DAIFMT_CBS_CFS, + .ops = &s3c24xx_uda134x_ops, + SND_SOC_DAILINK_REG(uda134x), +}; + +static struct snd_soc_card snd_soc_s3c24xx_uda134x = { + .name = "S3C24XX_UDA134X", + .owner = THIS_MODULE, + .dai_link = &s3c24xx_uda134x_dai_link, + .num_links = 1, +}; + +static int s3c24xx_uda134x_probe(struct platform_device *pdev) +{ + struct snd_soc_card *card = &snd_soc_s3c24xx_uda134x; + struct s3c24xx_uda134x *priv; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + mutex_init(&priv->clk_lock); + + card->dev = &pdev->dev; + snd_soc_card_set_drvdata(card, priv); + + ret = devm_snd_soc_register_card(&pdev->dev, card); + if (ret) + dev_err(&pdev->dev, "failed to register card: %d\n", ret); + + return ret; +} + +static struct platform_driver s3c24xx_uda134x_driver = { + .probe = s3c24xx_uda134x_probe, + .driver = { + .name = "s3c24xx_uda134x", + }, +}; +module_platform_driver(s3c24xx_uda134x_driver); + +MODULE_AUTHOR("Zoltan Devai, Christian Pellegrin <chripell@evolware.org>"); +MODULE_DESCRIPTION("S3C24XX_UDA134X ALSA SoC audio driver"); +MODULE_LICENSE("GPL"); |