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304 lines
7.3 KiB
304 lines
7.3 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/clk.h> |
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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/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#include <linux/slab.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/dmaengine_pcm.h> |
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#define AXI_I2S_REG_RESET 0x00 |
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#define AXI_I2S_REG_CTRL 0x04 |
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#define AXI_I2S_REG_CLK_CTRL 0x08 |
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#define AXI_I2S_REG_STATUS 0x10 |
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#define AXI_I2S_REG_RX_FIFO 0x28 |
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#define AXI_I2S_REG_TX_FIFO 0x2C |
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#define AXI_I2S_RESET_GLOBAL BIT(0) |
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#define AXI_I2S_RESET_TX_FIFO BIT(1) |
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#define AXI_I2S_RESET_RX_FIFO BIT(2) |
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#define AXI_I2S_CTRL_TX_EN BIT(0) |
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#define AXI_I2S_CTRL_RX_EN BIT(1) |
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/* The frame size is configurable, but for now we always set it 64 bit */ |
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#define AXI_I2S_BITS_PER_FRAME 64 |
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struct axi_i2s { |
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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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bool has_capture; |
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bool has_playback; |
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struct snd_soc_dai_driver dai_driver; |
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struct snd_dmaengine_dai_dma_data capture_dma_data; |
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struct snd_dmaengine_dai_dma_data playback_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_i2s_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_i2s *i2s = snd_soc_dai_get_drvdata(dai); |
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unsigned int mask, val; |
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) |
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mask = AXI_I2S_CTRL_RX_EN; |
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else |
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mask = AXI_I2S_CTRL_TX_EN; |
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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 = mask; |
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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(i2s->regmap, AXI_I2S_REG_CTRL, mask, val); |
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return 0; |
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} |
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static int axi_i2s_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_i2s *i2s = snd_soc_dai_get_drvdata(dai); |
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unsigned int bclk_div, word_size; |
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unsigned int bclk_rate; |
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bclk_rate = params_rate(params) * AXI_I2S_BITS_PER_FRAME; |
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word_size = AXI_I2S_BITS_PER_FRAME / 2 - 1; |
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bclk_div = DIV_ROUND_UP(clk_get_rate(i2s->clk_ref), bclk_rate) / 2 - 1; |
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regmap_write(i2s->regmap, AXI_I2S_REG_CLK_CTRL, (word_size << 16) | |
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bclk_div); |
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return 0; |
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} |
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static int axi_i2s_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_i2s *i2s = snd_soc_dai_get_drvdata(dai); |
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uint32_t mask; |
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int ret; |
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if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) |
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mask = AXI_I2S_RESET_RX_FIFO; |
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else |
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mask = AXI_I2S_RESET_TX_FIFO; |
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regmap_write(i2s->regmap, AXI_I2S_REG_RESET, mask); |
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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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&i2s->rate_constraints); |
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if (ret) |
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return ret; |
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return clk_prepare_enable(i2s->clk_ref); |
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} |
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static void axi_i2s_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_i2s *i2s = snd_soc_dai_get_drvdata(dai); |
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clk_disable_unprepare(i2s->clk_ref); |
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} |
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static int axi_i2s_dai_probe(struct snd_soc_dai *dai) |
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{ |
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struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai); |
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snd_soc_dai_init_dma_data( |
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dai, |
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i2s->has_playback ? &i2s->playback_dma_data : NULL, |
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i2s->has_capture ? &i2s->capture_dma_data : NULL); |
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return 0; |
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} |
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static const struct snd_soc_dai_ops axi_i2s_dai_ops = { |
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.startup = axi_i2s_startup, |
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.shutdown = axi_i2s_shutdown, |
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.trigger = axi_i2s_trigger, |
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.hw_params = axi_i2s_hw_params, |
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}; |
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static struct snd_soc_dai_driver axi_i2s_dai = { |
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.probe = axi_i2s_dai_probe, |
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.ops = &axi_i2s_dai_ops, |
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.symmetric_rate = 1, |
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}; |
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static const struct snd_soc_component_driver axi_i2s_component = { |
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.name = "axi-i2s", |
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}; |
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static const struct regmap_config axi_i2s_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_I2S_REG_STATUS, |
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}; |
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static void axi_i2s_parse_of(struct axi_i2s *i2s, const struct device_node *np) |
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{ |
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struct property *dma_names; |
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const char *dma_name; |
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of_property_for_each_string(np, "dma-names", dma_names, dma_name) { |
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if (strcmp(dma_name, "rx") == 0) |
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i2s->has_capture = true; |
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if (strcmp(dma_name, "tx") == 0) |
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i2s->has_playback = true; |
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} |
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} |
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static int axi_i2s_probe(struct platform_device *pdev) |
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{ |
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struct resource *res; |
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struct axi_i2s *i2s; |
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void __iomem *base; |
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int ret; |
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i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL); |
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if (!i2s) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, i2s); |
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axi_i2s_parse_of(i2s, pdev->dev.of_node); |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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base = devm_ioremap_resource(&pdev->dev, res); |
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if (IS_ERR(base)) |
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return PTR_ERR(base); |
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i2s->regmap = devm_regmap_init_mmio(&pdev->dev, base, |
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&axi_i2s_regmap_config); |
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if (IS_ERR(i2s->regmap)) |
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return PTR_ERR(i2s->regmap); |
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i2s->clk = devm_clk_get(&pdev->dev, "axi"); |
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if (IS_ERR(i2s->clk)) |
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return PTR_ERR(i2s->clk); |
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i2s->clk_ref = devm_clk_get(&pdev->dev, "ref"); |
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if (IS_ERR(i2s->clk_ref)) |
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return PTR_ERR(i2s->clk_ref); |
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ret = clk_prepare_enable(i2s->clk); |
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if (ret) |
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return ret; |
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if (i2s->has_playback) { |
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axi_i2s_dai.playback.channels_min = 2; |
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axi_i2s_dai.playback.channels_max = 2; |
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axi_i2s_dai.playback.rates = SNDRV_PCM_RATE_KNOT; |
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axi_i2s_dai.playback.formats = |
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SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE; |
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i2s->playback_dma_data.addr = res->start + AXI_I2S_REG_TX_FIFO; |
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i2s->playback_dma_data.addr_width = 4; |
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i2s->playback_dma_data.maxburst = 1; |
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} |
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if (i2s->has_capture) { |
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axi_i2s_dai.capture.channels_min = 2; |
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axi_i2s_dai.capture.channels_max = 2; |
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axi_i2s_dai.capture.rates = SNDRV_PCM_RATE_KNOT; |
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axi_i2s_dai.capture.formats = |
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SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE; |
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i2s->capture_dma_data.addr = res->start + AXI_I2S_REG_RX_FIFO; |
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i2s->capture_dma_data.addr_width = 4; |
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i2s->capture_dma_data.maxburst = 1; |
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} |
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i2s->ratnum.num = clk_get_rate(i2s->clk_ref) / 2 / AXI_I2S_BITS_PER_FRAME; |
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i2s->ratnum.den_step = 1; |
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i2s->ratnum.den_min = 1; |
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i2s->ratnum.den_max = 64; |
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i2s->rate_constraints.rats = &i2s->ratnum; |
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i2s->rate_constraints.nrats = 1; |
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regmap_write(i2s->regmap, AXI_I2S_REG_RESET, AXI_I2S_RESET_GLOBAL); |
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ret = devm_snd_soc_register_component(&pdev->dev, &axi_i2s_component, |
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&axi_i2s_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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dev_info(&pdev->dev, "probed, capture %s, playback %s\n", |
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i2s->has_capture ? "enabled" : "disabled", |
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i2s->has_playback ? "enabled" : "disabled"); |
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return 0; |
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err_clk_disable: |
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clk_disable_unprepare(i2s->clk); |
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return ret; |
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} |
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static int axi_i2s_dev_remove(struct platform_device *pdev) |
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{ |
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struct axi_i2s *i2s = platform_get_drvdata(pdev); |
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clk_disable_unprepare(i2s->clk); |
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return 0; |
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} |
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static const struct of_device_id axi_i2s_of_match[] = { |
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{ .compatible = "adi,axi-i2s-1.00.a", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, axi_i2s_of_match); |
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static struct platform_driver axi_i2s_driver = { |
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.driver = { |
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.name = "axi-i2s", |
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.of_match_table = axi_i2s_of_match, |
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}, |
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.probe = axi_i2s_probe, |
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.remove = axi_i2s_dev_remove, |
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}; |
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module_platform_driver(axi_i2s_driver); |
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MODULE_AUTHOR("Lars-Peter Clausen <[email protected]>"); |
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MODULE_DESCRIPTION("AXI I2S driver"); |
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MODULE_LICENSE("GPL");
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