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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /sound/soc/samsung/s3c24xx_uda134x.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'sound/soc/samsung/s3c24xx_uda134x.c')
-rw-r--r--sound/soc/samsung/s3c24xx_uda134x.c257
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");