278 lines
6.5 KiB
C
278 lines
6.5 KiB
C
/*
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* Copyright (C) 2012-2013, Analog Devices Inc.
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* Author: Lars-Peter Clausen <lars@metafoo.de>
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*
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* Licensed under the GPL-2.
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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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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(dai, &i2s->playback_dma_data,
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&i2s->capture_dma_data);
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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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.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_S32_LE | SNDRV_PCM_FMTBIT_U32_LE,
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},
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.capture = {
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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_S32_LE | SNDRV_PCM_FMTBIT_U32_LE,
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},
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.ops = &axi_i2s_dai_ops,
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.symmetric_rates = 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 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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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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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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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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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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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 <lars@metafoo.de>");
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MODULE_DESCRIPTION("AXI I2S driver");
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MODULE_LICENSE("GPL");
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