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