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");