1 files changed, 272 insertions, 0 deletions

diff --git a/sound/soc/adi/axi-spdif.c b/sound/soc/adi/axi-spdif.c
new file mode 100644
index 000000000000..8db7a9920695
--- /dev/null
+++ b/sound/soc/adi/axi-spdif.c
@@ -0,0 +1,272 @@
+/*
+ * Copyright (C) 2012-2013, Analog Devices Inc.
+ * Author: Lars-Peter Clausen <lars@metafoo.de>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/clk.h>
+#include <linux/regmap.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/initval.h>
+#include <sound/dmaengine_pcm.h>
+
+#define AXI_SPDIF_REG_CTRL      0x0
+#define AXI_SPDIF_REG_STAT      0x4
+#define AXI_SPDIF_REG_TX_FIFO   0xc
+
+#define AXI_SPDIF_CTRL_TXDATA BIT(1)
+#define AXI_SPDIF_CTRL_TXEN BIT(0)
+#define AXI_SPDIF_CTRL_CLKDIV_OFFSET 8
+#define AXI_SPDIF_CTRL_CLKDIV_MASK (0xff << 8)
+
+#define AXI_SPDIF_FREQ_44100    (0x0 << 6)
+#define AXI_SPDIF_FREQ_48000    (0x1 << 6)
+#define AXI_SPDIF_FREQ_32000    (0x2 << 6)
+#define AXI_SPDIF_FREQ_NA       (0x3 << 6)
+
+struct axi_spdif {
+        struct regmap *regmap;
+        struct clk *clk;
+        struct clk *clk_ref;
+
+        struct snd_dmaengine_dai_dma_data dma_data;
+
+        struct snd_ratnum ratnum;
+        struct snd_pcm_hw_constraint_ratnums rate_constraints;
+};
+
+static int axi_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
+        struct snd_soc_dai *dai)
+{
+        struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
+        unsigned int val;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                val = AXI_SPDIF_CTRL_TXDATA;
+                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(spdif->regmap, AXI_SPDIF_REG_CTRL,
+                AXI_SPDIF_CTRL_TXDATA, val);
+
+        return 0;
+}
+
+static int axi_spdif_hw_params(struct snd_pcm_substream *substream,
+        struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+        struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
+        unsigned int rate = params_rate(params);
+        unsigned int clkdiv, stat;
+
+        switch (params_rate(params)) {
+        case 32000:
+                stat = AXI_SPDIF_FREQ_32000;
+                break;
+        case 44100:
+                stat = AXI_SPDIF_FREQ_44100;
+                break;
+        case 48000:
+                stat = AXI_SPDIF_FREQ_48000;
+                break;
+        default:
+                stat = AXI_SPDIF_FREQ_NA;
+                break;
+        }
+
+        clkdiv = DIV_ROUND_CLOSEST(clk_get_rate(spdif->clk_ref),
+                        rate * 64 * 2) - 1;
+        clkdiv <<= AXI_SPDIF_CTRL_CLKDIV_OFFSET;
+
+        regmap_write(spdif->regmap, AXI_SPDIF_REG_STAT, stat);
+        regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL,
+                AXI_SPDIF_CTRL_CLKDIV_MASK, clkdiv);
+
+        return 0;
+}
+
+static int axi_spdif_dai_probe(struct snd_soc_dai *dai)
+{
+        struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
+
+        snd_soc_dai_init_dma_data(dai, &spdif->dma_data, NULL);
+
+        return 0;
+}
+
+static int axi_spdif_startup(struct snd_pcm_substream *substream,
+        struct snd_soc_dai *dai)
+{
+        struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
+        int ret;
+
+        ret = snd_pcm_hw_constraint_ratnums(substream->runtime, 0,
+                           SNDRV_PCM_HW_PARAM_RATE,
+                           &spdif->rate_constraints);
+        if (ret)
+                return ret;
+
+        ret = clk_prepare_enable(spdif->clk_ref);
+        if (ret)
+                return ret;
+
+        regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL,
+                AXI_SPDIF_CTRL_TXEN, AXI_SPDIF_CTRL_TXEN);
+
+        return 0;
+}
+
+static void axi_spdif_shutdown(struct snd_pcm_substream *substream,
+        struct snd_soc_dai *dai)
+{
+        struct axi_spdif *spdif = snd_soc_dai_get_drvdata(dai);
+
+        regmap_update_bits(spdif->regmap, AXI_SPDIF_REG_CTRL,
+                AXI_SPDIF_CTRL_TXEN, 0);
+
+        clk_disable_unprepare(spdif->clk_ref);
+}
+
+static const struct snd_soc_dai_ops axi_spdif_dai_ops = {
+        .startup = axi_spdif_startup,
+        .shutdown = axi_spdif_shutdown,
+        .trigger = axi_spdif_trigger,
+        .hw_params = axi_spdif_hw_params,
+};
+
+static struct snd_soc_dai_driver axi_spdif_dai = {
+        .probe = axi_spdif_dai_probe,
+        .playback = {
+                .channels_min = 2,
+                .channels_max = 2,
+                .rates = SNDRV_PCM_RATE_KNOT,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,
+        },
+        .ops = &axi_spdif_dai_ops,
+};
+
+static const struct snd_soc_component_driver axi_spdif_component = {
+        .name = "axi-spdif",
+};
+
+static const struct regmap_config axi_spdif_regmap_config = {
+        .reg_bits = 32,
+        .reg_stride = 4,
+        .val_bits = 32,
+        .max_register = AXI_SPDIF_REG_STAT,
+};
+
+static int axi_spdif_probe(struct platform_device *pdev)
+{
+        struct axi_spdif *spdif;
+        struct resource *res;
+        void __iomem *base;
+        int ret;
+
+        spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL);
+        if (!spdif)
+                return -ENOMEM;
+
+        platform_set_drvdata(pdev, spdif);
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        base = devm_ioremap_resource(&pdev->dev, res);
+        if (IS_ERR(base))
+                return PTR_ERR(base);
+
+        spdif->regmap = devm_regmap_init_mmio(&pdev->dev, base,
+                                            &axi_spdif_regmap_config);
+        if (IS_ERR(spdif->regmap))
+                return PTR_ERR(spdif->regmap);
+
+        spdif->clk = devm_clk_get(&pdev->dev, "axi");
+        if (IS_ERR(spdif->clk))
+                return PTR_ERR(spdif->clk);
+
+        spdif->clk_ref = devm_clk_get(&pdev->dev, "ref");
+        if (IS_ERR(spdif->clk_ref))
+                return PTR_ERR(spdif->clk_ref);
+
+        ret = clk_prepare_enable(spdif->clk);
+        if (ret)
+                return ret;
+
+        spdif->dma_data.addr = res->start + AXI_SPDIF_REG_TX_FIFO;
+        spdif->dma_data.addr_width = 4;
+        spdif->dma_data.maxburst = 1;
+
+        spdif->ratnum.num = clk_get_rate(spdif->clk_ref) / 128;
+        spdif->ratnum.den_step = 1;
+        spdif->ratnum.den_min = 1;
+        spdif->ratnum.den_max = 64;
+
+        spdif->rate_constraints.rats = &spdif->ratnum;
+        spdif->rate_constraints.nrats = 1;
+
+        ret = devm_snd_soc_register_component(&pdev->dev, &axi_spdif_component,
+                                         &axi_spdif_dai, 1);
+        if (ret)
+                goto err_clk_disable;
+
+        ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL,
+                        SND_DMAENGINE_PCM_FLAG_NO_RESIDUE);
+        if (ret)
+                goto err_clk_disable;
+
+        return 0;
+
+err_clk_disable:
+        clk_disable_unprepare(spdif->clk);
+        return ret;
+}
+
+static int axi_spdif_dev_remove(struct platform_device *pdev)
+{
+        struct axi_spdif *spdif = platform_get_drvdata(pdev);
+
+        clk_disable_unprepare(spdif->clk);
+
+        return 0;
+}
+
+static const struct of_device_id axi_spdif_of_match[] = {
+        { .compatible = "adi,axi-spdif-tx-1.00.a", },
+        {},
+};
+MODULE_DEVICE_TABLE(of, axi_spdif_of_match);
+
+static struct platform_driver axi_spdif_driver = {
+        .driver = {
+                .name = "axi-spdif",
+                .owner = THIS_MODULE,
+                .of_match_table = axi_spdif_of_match,
+        },
+        .probe = axi_spdif_probe,
+        .remove = axi_spdif_dev_remove,
+};
+module_platform_driver(axi_spdif_driver);
+
+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
+MODULE_DESCRIPTION("AXI SPDIF driver");
+MODULE_LICENSE("GPL");