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269 lines
6.2 KiB
269 lines
6.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2012-2013, Analog Devices Inc. |
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* Author: Lars-Peter Clausen <[email protected]> |
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*/ |
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#include <linux/init.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/of.h> |
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#include <linux/clk.h> |
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#include <linux/regmap.h> |
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#include <sound/core.h> |
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#include <sound/pcm.h> |
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#include <sound/pcm_params.h> |
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#include <sound/soc.h> |
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#include <sound/initval.h> |
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#include <sound/dmaengine_pcm.h> |
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#define AXI_SPDIF_REG_CTRL 0x0 |
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#define AXI_SPDIF_REG_STAT 0x4 |
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#define AXI_SPDIF_REG_TX_FIFO 0xc |
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#define AXI_SPDIF_CTRL_TXDATA BIT(1) |
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#define AXI_SPDIF_CTRL_TXEN BIT(0) |
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#define AXI_SPDIF_CTRL_CLKDIV_OFFSET 8 |
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#define AXI_SPDIF_CTRL_CLKDIV_MASK (0xff << 8) |
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#define AXI_SPDIF_FREQ_44100 (0x0 << 6) |
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#define AXI_SPDIF_FREQ_48000 (0x1 << 6) |
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#define AXI_SPDIF_FREQ_32000 (0x2 << 6) |
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#define AXI_SPDIF_FREQ_NA (0x3 << 6) |
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struct axi_spdif { |
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struct regmap *regmap; |
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struct clk *clk; |
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struct clk *clk_ref; |
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struct snd_dmaengine_dai_dma_data dma_data; |
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struct snd_ratnum ratnum; |
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struct snd_pcm_hw_constraint_ratnums rate_constraints; |
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}; |
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static int axi_spdif_trigger(struct snd_pcm_substream *substream, int cmd, |
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struct snd_soc_dai *dai) |
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{ |
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struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); |
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unsigned int val; |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_START: |
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case SNDRV_PCM_TRIGGER_RESUME: |
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
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val = AXI_SPDIF_CTRL_TXDATA; |
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break; |
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case SNDRV_PCM_TRIGGER_STOP: |
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case SNDRV_PCM_TRIGGER_SUSPEND: |
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
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val = 0; |
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break; |
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default: |
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return -EINVAL; |
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} |
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regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL, |
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AXI_SPDIF_CTRL_TXDATA, val); |
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return 0; |
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} |
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static int axi_spdif_hw_params(struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) |
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{ |
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struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); |
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unsigned int rate = params_rate(params); |
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unsigned int clkdiv, stat; |
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switch (params_rate(params)) { |
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case 32000: |
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stat = AXI_SPDIF_FREQ_32000; |
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break; |
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case 44100: |
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stat = AXI_SPDIF_FREQ_44100; |
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break; |
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case 48000: |
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stat = AXI_SPDIF_FREQ_48000; |
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break; |
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default: |
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stat = AXI_SPDIF_FREQ_NA; |
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break; |
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} |
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clkdiv = DIV_ROUND_CLOSEST(clk_get_rate(spdif->clk_ref), |
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rate * 64 * 2) - 1; |
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clkdiv <<= AXI_SPDIF_CTRL_CLKDIV_OFFSET; |
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regmap_write(spdif->regmap, AXI_SPDIF_REG_STAT, stat); |
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regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL, |
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AXI_SPDIF_CTRL_CLKDIV_MASK, clkdiv); |
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return 0; |
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} |
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static int axi_spdif_dai_probe(struct snd_soc_dai *dai) |
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{ |
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struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); |
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snd_soc_dai_init_dma_data(dai, &spdif->dma_data, NULL); |
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return 0; |
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} |
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static int axi_spdif_startup(struct snd_pcm_substream *substream, |
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struct snd_soc_dai *dai) |
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{ |
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struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); |
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int ret; |
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ret = snd_pcm_hw_constraint_ratnums(substream->runtime, 0, |
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SNDRV_PCM_HW_PARAM_RATE, |
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&spdif->rate_constraints); |
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if (ret) |
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return ret; |
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ret = clk_prepare_enable(spdif->clk_ref); |
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if (ret) |
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return ret; |
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regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL, |
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AXI_SPDIF_CTRL_TXEN, AXI_SPDIF_CTRL_TXEN); |
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return 0; |
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} |
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static void axi_spdif_shutdown(struct snd_pcm_substream *substream, |
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struct snd_soc_dai *dai) |
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{ |
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struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai); |
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regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL, |
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AXI_SPDIF_CTRL_TXEN, 0); |
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clk_disable_unprepare(spdif->clk_ref); |
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} |
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static const struct snd_soc_dai_ops axi_spdif_dai_ops = { |
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.startup = axi_spdif_startup, |
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.shutdown = axi_spdif_shutdown, |
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.trigger = axi_spdif_trigger, |
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.hw_params = axi_spdif_hw_params, |
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}; |
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static struct snd_soc_dai_driver axi_spdif_dai = { |
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.probe = axi_spdif_dai_probe, |
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.playback = { |
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.channels_min = 2, |
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.channels_max = 2, |
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.rates = SNDRV_PCM_RATE_KNOT, |
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.formats = SNDRV_PCM_FMTBIT_S16_LE, |
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}, |
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.ops = &axi_spdif_dai_ops, |
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}; |
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static const struct snd_soc_component_driver axi_spdif_component = { |
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.name = "axi-spdif", |
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.legacy_dai_naming = 1, |
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}; |
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static const struct regmap_config axi_spdif_regmap_config = { |
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.reg_bits = 32, |
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.reg_stride = 4, |
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.val_bits = 32, |
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.max_register = AXI_SPDIF_REG_STAT, |
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}; |
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static int axi_spdif_probe(struct platform_device *pdev) |
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{ |
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struct axi_spdif *spdif; |
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struct resource *res; |
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void __iomem *base; |
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int ret; |
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spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL); |
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if (!spdif) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, spdif); |
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base = devm_platform_get_and_ioremap_resource(pdev, 0, &res); |
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if (IS_ERR(base)) |
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return PTR_ERR(base); |
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spdif->regmap = devm_regmap_init_mmio(&pdev->dev, base, |
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&axi_spdif_regmap_config); |
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if (IS_ERR(spdif->regmap)) |
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return PTR_ERR(spdif->regmap); |
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spdif->clk = devm_clk_get(&pdev->dev, "axi"); |
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if (IS_ERR(spdif->clk)) |
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return PTR_ERR(spdif->clk); |
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spdif->clk_ref = devm_clk_get(&pdev->dev, "ref"); |
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if (IS_ERR(spdif->clk_ref)) |
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return PTR_ERR(spdif->clk_ref); |
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ret = clk_prepare_enable(spdif->clk); |
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if (ret) |
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return ret; |
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spdif->dma_data.addr = res->start + AXI_SPDIF_REG_TX_FIFO; |
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spdif->dma_data.addr_width = 4; |
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spdif->dma_data.maxburst = 1; |
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spdif->ratnum.num = clk_get_rate(spdif->clk_ref) / 128; |
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spdif->ratnum.den_step = 1; |
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spdif->ratnum.den_min = 1; |
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spdif->ratnum.den_max = 64; |
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spdif->rate_constraints.rats = &spdif->ratnum; |
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spdif->rate_constraints.nrats = 1; |
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ret = devm_snd_soc_register_component(&pdev->dev, &axi_spdif_component, |
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&axi_spdif_dai, 1); |
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if (ret) |
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goto err_clk_disable; |
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ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0); |
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if (ret) |
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goto err_clk_disable; |
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return 0; |
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err_clk_disable: |
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clk_disable_unprepare(spdif->clk); |
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return ret; |
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} |
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static int axi_spdif_dev_remove(struct platform_device *pdev) |
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{ |
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struct axi_spdif *spdif = platform_get_drvdata(pdev); |
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clk_disable_unprepare(spdif->clk); |
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return 0; |
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} |
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static const struct of_device_id axi_spdif_of_match[] = { |
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{ .compatible = "adi,axi-spdif-tx-1.00.a", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, axi_spdif_of_match); |
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static struct platform_driver axi_spdif_driver = { |
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.driver = { |
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.name = "axi-spdif", |
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.of_match_table = axi_spdif_of_match, |
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}, |
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.probe = axi_spdif_probe, |
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.remove = axi_spdif_dev_remove, |
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}; |
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module_platform_driver(axi_spdif_driver); |
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MODULE_AUTHOR("Lars-Peter Clausen <[email protected]>"); |
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MODULE_DESCRIPTION("AXI SPDIF driver"); |
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MODULE_LICENSE("GPL");
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