diff options
Diffstat (limited to '')
| -rw-r--r-- | sound/soc/samsung/snow.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/sound/soc/samsung/snow.c b/sound/soc/samsung/snow.c new file mode 100644 index 000000000..da342da03 --- /dev/null +++ b/sound/soc/samsung/snow.c @@ -0,0 +1,257 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// ASoC machine driver for Snow boards + +#include <linux/clk.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> + +#include "i2s.h" + +#define FIN_PLL_RATE 24000000 + +SND_SOC_DAILINK_DEFS(links, + DAILINK_COMP_ARRAY(COMP_EMPTY()), + DAILINK_COMP_ARRAY(COMP_EMPTY()), + DAILINK_COMP_ARRAY(COMP_EMPTY())); + +struct snow_priv { + struct snd_soc_dai_link dai_link; + struct clk *clk_i2s_bus; +}; + +static int snow_card_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + static const unsigned int pll_rate[] = { + 73728000U, 67737602U, 49152000U, 45158401U, 32768001U + }; + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct snow_priv *priv = snd_soc_card_get_drvdata(rtd->card); + int bfs, psr, rfs, bitwidth; + unsigned long int rclk; + long int freq = -EINVAL; + int ret, i; + + bitwidth = snd_pcm_format_width(params_format(params)); + if (bitwidth < 0) { + dev_err(rtd->card->dev, "Invalid bit-width: %d\n", bitwidth); + return bitwidth; + } + + if (bitwidth != 16 && bitwidth != 24) { + dev_err(rtd->card->dev, "Unsupported bit-width: %d\n", bitwidth); + return -EINVAL; + } + + bfs = 2 * bitwidth; + + switch (params_rate(params)) { + case 16000: + case 22050: + case 24000: + case 32000: + case 44100: + case 48000: + case 88200: + case 96000: + rfs = 8 * bfs; + break; + case 64000: + rfs = 384; + break; + case 8000: + case 11025: + case 12000: + rfs = 16 * bfs; + break; + default: + return -EINVAL; + } + + rclk = params_rate(params) * rfs; + + for (psr = 8; psr > 0; psr /= 2) { + for (i = 0; i < ARRAY_SIZE(pll_rate); i++) { + if ((pll_rate[i] - rclk * psr) <= 2) { + freq = pll_rate[i]; + break; + } + } + } + if (freq < 0) { + dev_err(rtd->card->dev, "Unsupported RCLK rate: %lu\n", rclk); + return -EINVAL; + } + + ret = clk_set_rate(priv->clk_i2s_bus, freq); + if (ret < 0) { + dev_err(rtd->card->dev, "I2S bus clock rate set failed\n"); + return ret; + } + + return 0; +} + +static const struct snd_soc_ops snow_card_ops = { + .hw_params = snow_card_hw_params, +}; + +static int snow_late_probe(struct snd_soc_card *card) +{ + struct snd_soc_pcm_runtime *rtd; + struct snd_soc_dai *codec_dai; + + rtd = snd_soc_get_pcm_runtime(card, &card->dai_link[0]); + + /* In the multi-codec case codec_dais 0 is MAX98095 and 1 is HDMI. */ + codec_dai = asoc_rtd_to_codec(rtd, 0); + + /* Set the MCLK rate for the codec */ + return snd_soc_dai_set_sysclk(codec_dai, 0, + FIN_PLL_RATE, SND_SOC_CLOCK_IN); +} + +static struct snd_soc_card snow_snd = { + .name = "Snow-I2S", + .owner = THIS_MODULE, + .late_probe = snow_late_probe, +}; + +static int snow_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct snd_soc_card *card = &snow_snd; + struct device_node *cpu, *codec; + struct snd_soc_dai_link *link; + struct snow_priv *priv; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + link = &priv->dai_link; + + link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF | + SND_SOC_DAIFMT_CBS_CFS; + + link->name = "Primary"; + link->stream_name = link->name; + + link->cpus = links_cpus; + link->num_cpus = ARRAY_SIZE(links_cpus); + link->codecs = links_codecs; + link->num_codecs = ARRAY_SIZE(links_codecs); + link->platforms = links_platforms; + link->num_platforms = ARRAY_SIZE(links_platforms); + + card->dai_link = link; + card->num_links = 1; + card->dev = dev; + + /* Try new DT bindings with HDMI support first. */ + cpu = of_get_child_by_name(dev->of_node, "cpu"); + + if (cpu) { + link->ops = &snow_card_ops; + + link->cpus->of_node = of_parse_phandle(cpu, "sound-dai", 0); + of_node_put(cpu); + + if (!link->cpus->of_node) { + dev_err(dev, "Failed parsing cpu/sound-dai property\n"); + return -EINVAL; + } + + codec = of_get_child_by_name(dev->of_node, "codec"); + ret = snd_soc_of_get_dai_link_codecs(dev, codec, link); + of_node_put(codec); + + if (ret < 0) { + of_node_put(link->cpus->of_node); + dev_err(dev, "Failed parsing codec node\n"); + return ret; + } + + priv->clk_i2s_bus = of_clk_get_by_name(link->cpus->of_node, + "i2s_opclk0"); + if (IS_ERR(priv->clk_i2s_bus)) { + snd_soc_of_put_dai_link_codecs(link); + of_node_put(link->cpus->of_node); + return PTR_ERR(priv->clk_i2s_bus); + } + } else { + link->codecs->dai_name = "HiFi"; + + link->cpus->of_node = of_parse_phandle(dev->of_node, + "samsung,i2s-controller", 0); + if (!link->cpus->of_node) { + dev_err(dev, "i2s-controller property parse error\n"); + return -EINVAL; + } + + link->codecs->of_node = of_parse_phandle(dev->of_node, + "samsung,audio-codec", 0); + if (!link->codecs->of_node) { + of_node_put(link->cpus->of_node); + dev_err(dev, "audio-codec property parse error\n"); + return -EINVAL; + } + } + + link->platforms->of_node = link->cpus->of_node; + + /* Update card-name if provided through DT, else use default name */ + snd_soc_of_parse_card_name(card, "samsung,model"); + + snd_soc_card_set_drvdata(card, priv); + + ret = devm_snd_soc_register_card(dev, card); + if (ret) + return dev_err_probe(&pdev->dev, ret, + "snd_soc_register_card failed\n"); + + return 0; +} + +static int snow_remove(struct platform_device *pdev) +{ + struct snow_priv *priv = platform_get_drvdata(pdev); + struct snd_soc_dai_link *link = &priv->dai_link; + + of_node_put(link->cpus->of_node); + of_node_put(link->codecs->of_node); + snd_soc_of_put_dai_link_codecs(link); + + clk_put(priv->clk_i2s_bus); + + return 0; +} + +static const struct of_device_id snow_of_match[] = { + { .compatible = "google,snow-audio-max98090", }, + { .compatible = "google,snow-audio-max98091", }, + { .compatible = "google,snow-audio-max98095", }, + {}, +}; +MODULE_DEVICE_TABLE(of, snow_of_match); + +static struct platform_driver snow_driver = { + .driver = { + .name = "snow-audio", + .pm = &snd_soc_pm_ops, + .of_match_table = snow_of_match, + }, + .probe = snow_probe, + .remove = snow_remove, +}; + +module_platform_driver(snow_driver); + +MODULE_DESCRIPTION("ALSA SoC Audio machine driver for Snow"); +MODULE_LICENSE("GPL"); |