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Diffstat (limited to 'sound/soc/adi/axi-i2s.c')
-rw-r--r--sound/soc/adi/axi-i2s.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/sound/soc/adi/axi-i2s.c b/sound/soc/adi/axi-i2s.c
new file mode 100644
index 000000000..4c2338172
--- /dev/null
+++ b/sound/soc/adi/axi-i2s.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (C) 2012-2013, Analog Devices Inc.
+ * Author: Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/clk.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/dmaengine_pcm.h>
+
+#define AXI_I2S_REG_RESET 0x00
+#define AXI_I2S_REG_CTRL 0x04
+#define AXI_I2S_REG_CLK_CTRL 0x08
+#define AXI_I2S_REG_STATUS 0x10
+
+#define AXI_I2S_REG_RX_FIFO 0x28
+#define AXI_I2S_REG_TX_FIFO 0x2C
+
+#define AXI_I2S_RESET_GLOBAL BIT(0)
+#define AXI_I2S_RESET_TX_FIFO BIT(1)
+#define AXI_I2S_RESET_RX_FIFO BIT(2)
+
+#define AXI_I2S_CTRL_TX_EN BIT(0)
+#define AXI_I2S_CTRL_RX_EN BIT(1)
+
+/* The frame size is configurable, but for now we always set it 64 bit */
+#define AXI_I2S_BITS_PER_FRAME 64
+
+struct axi_i2s {
+ struct regmap *regmap;
+ struct clk *clk;
+ struct clk *clk_ref;
+
+ struct snd_soc_dai_driver dai_driver;
+
+ struct snd_dmaengine_dai_dma_data capture_dma_data;
+ struct snd_dmaengine_dai_dma_data playback_dma_data;
+
+ struct snd_ratnum ratnum;
+ struct snd_pcm_hw_constraint_ratnums rate_constraints;
+};
+
+static int axi_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+ unsigned int mask, val;
+
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ mask = AXI_I2S_CTRL_RX_EN;
+ else
+ mask = AXI_I2S_CTRL_TX_EN;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ val = mask;
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ val = 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ regmap_update_bits(i2s->regmap, AXI_I2S_REG_CTRL, mask, val);
+
+ return 0;
+}
+
+static int axi_i2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+ struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+ unsigned int bclk_div, word_size;
+ unsigned int bclk_rate;
+
+ bclk_rate = params_rate(params) * AXI_I2S_BITS_PER_FRAME;
+
+ word_size = AXI_I2S_BITS_PER_FRAME / 2 - 1;
+ bclk_div = DIV_ROUND_UP(clk_get_rate(i2s->clk_ref), bclk_rate) / 2 - 1;
+
+ regmap_write(i2s->regmap, AXI_I2S_REG_CLK_CTRL, (word_size << 16) |
+ bclk_div);
+
+ return 0;
+}
+
+static int axi_i2s_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+ uint32_t mask;
+ int ret;
+
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ mask = AXI_I2S_RESET_RX_FIFO;
+ else
+ mask = AXI_I2S_RESET_TX_FIFO;
+
+ regmap_write(i2s->regmap, AXI_I2S_REG_RESET, mask);
+
+ ret = snd_pcm_hw_constraint_ratnums(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_RATE,
+ &i2s->rate_constraints);
+ if (ret)
+ return ret;
+
+ return clk_prepare_enable(i2s->clk_ref);
+}
+
+static void axi_i2s_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+ clk_disable_unprepare(i2s->clk_ref);
+}
+
+static int axi_i2s_dai_probe(struct snd_soc_dai *dai)
+{
+ struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+ snd_soc_dai_init_dma_data(dai, &i2s->playback_dma_data,
+ &i2s->capture_dma_data);
+
+ return 0;
+}
+
+static const struct snd_soc_dai_ops axi_i2s_dai_ops = {
+ .startup = axi_i2s_startup,
+ .shutdown = axi_i2s_shutdown,
+ .trigger = axi_i2s_trigger,
+ .hw_params = axi_i2s_hw_params,
+};
+
+static struct snd_soc_dai_driver axi_i2s_dai = {
+ .probe = axi_i2s_dai_probe,
+ .playback = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_KNOT,
+ .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE,
+ },
+ .capture = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_KNOT,
+ .formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE,
+ },
+ .ops = &axi_i2s_dai_ops,
+ .symmetric_rates = 1,
+};
+
+static const struct snd_soc_component_driver axi_i2s_component = {
+ .name = "axi-i2s",
+};
+
+static const struct regmap_config axi_i2s_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = AXI_I2S_REG_STATUS,
+};
+
+static int axi_i2s_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct axi_i2s *i2s;
+ void __iomem *base;
+ int ret;
+
+ i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
+ if (!i2s)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, i2s);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ i2s->regmap = devm_regmap_init_mmio(&pdev->dev, base,
+ &axi_i2s_regmap_config);
+ if (IS_ERR(i2s->regmap))
+ return PTR_ERR(i2s->regmap);
+
+ i2s->clk = devm_clk_get(&pdev->dev, "axi");
+ if (IS_ERR(i2s->clk))
+ return PTR_ERR(i2s->clk);
+
+ i2s->clk_ref = devm_clk_get(&pdev->dev, "ref");
+ if (IS_ERR(i2s->clk_ref))
+ return PTR_ERR(i2s->clk_ref);
+
+ ret = clk_prepare_enable(i2s->clk);
+ if (ret)
+ return ret;
+
+ i2s->playback_dma_data.addr = res->start + AXI_I2S_REG_TX_FIFO;
+ i2s->playback_dma_data.addr_width = 4;
+ i2s->playback_dma_data.maxburst = 1;
+
+ i2s->capture_dma_data.addr = res->start + AXI_I2S_REG_RX_FIFO;
+ i2s->capture_dma_data.addr_width = 4;
+ i2s->capture_dma_data.maxburst = 1;
+
+ i2s->ratnum.num = clk_get_rate(i2s->clk_ref) / 2 / AXI_I2S_BITS_PER_FRAME;
+ i2s->ratnum.den_step = 1;
+ i2s->ratnum.den_min = 1;
+ i2s->ratnum.den_max = 64;
+
+ i2s->rate_constraints.rats = &i2s->ratnum;
+ i2s->rate_constraints.nrats = 1;
+
+ regmap_write(i2s->regmap, AXI_I2S_REG_RESET, AXI_I2S_RESET_GLOBAL);
+
+ ret = devm_snd_soc_register_component(&pdev->dev, &axi_i2s_component,
+ &axi_i2s_dai, 1);
+ if (ret)
+ goto err_clk_disable;
+
+ ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+ if (ret)
+ goto err_clk_disable;
+
+ return 0;
+
+err_clk_disable:
+ clk_disable_unprepare(i2s->clk);
+ return ret;
+}
+
+static int axi_i2s_dev_remove(struct platform_device *pdev)
+{
+ struct axi_i2s *i2s = platform_get_drvdata(pdev);
+
+ clk_disable_unprepare(i2s->clk);
+
+ return 0;
+}
+
+static const struct of_device_id axi_i2s_of_match[] = {
+ { .compatible = "adi,axi-i2s-1.00.a", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, axi_i2s_of_match);
+
+static struct platform_driver axi_i2s_driver = {
+ .driver = {
+ .name = "axi-i2s",
+ .of_match_table = axi_i2s_of_match,
+ },
+ .probe = axi_i2s_probe,
+ .remove = axi_i2s_dev_remove,
+};
+module_platform_driver(axi_i2s_driver);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("AXI I2S driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-01 02:44:45 +0000