Added SPDIF audio driver. This provides playback and capture of AES audio over SPDIF interface.
Signed-off-by: Maruthi Srinivas Bayyavarapu maruthi.srinivas.bayyavarapu@xilinx.com --- sound/soc/xilinx/xlnx_spdif.c | 339 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 339 insertions(+) create mode 100644 sound/soc/xilinx/xlnx_spdif.c
diff --git a/sound/soc/xilinx/xlnx_spdif.c b/sound/soc/xilinx/xlnx_spdif.c new file mode 100644 index 0000000..3b9000f --- /dev/null +++ b/sound/soc/xilinx/xlnx_spdif.c @@ -0,0 +1,339 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Xilinx ASoC SPDIF audio support +// +// Copyright (C) 2018 Xilinx, Inc. +// +// Author: Maruthi Srinivas Bayyavarapu maruthis@xilinx.com +// + +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <sound/pcm_params.h> +#include <sound/soc.h> + +#define XLNX_SPDIF_RATES \ + (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | \ + SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 | \ + SNDRV_PCM_RATE_192000) + +#define XLNX_SPDIF_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE) + +#define XSPDIF_IRQ_STS_REG 0x20 +#define XSPDIF_IRQ_ENABLE_REG 0x28 +#define XSPDIF_SOFT_RESET_REG 0x40 +#define XSPDIF_CONTROL_REG 0x44 +#define XSPDIF_CHAN_0_STS_REG 0x4C +#define XSPDIF_GLOBAL_IRQ_ENABLE_REG 0x1C +#define XSPDIF_CH_A_USER_DATA_REG_0 0x64 + +#define XSPDIF_CORE_ENABLE_MASK BIT(0) +#define XSPDIF_FIFO_FLUSH_MASK BIT(1) +#define XSPDIF_CH_STS_MASK BIT(5) +#define XSPDIF_GLOBAL_IRQ_ENABLE BIT(31) +#define XSPDIF_CLOCK_CONFIG_BITS_MASK GENMASK(5, 2) +#define XSPDIF_CLOCK_CONFIG_BITS_SHIFT 2 +#define XSPDIF_SOFT_RESET_VALUE 0xA + +#define MAX_CHANNELS 2 +#define AES_SAMPLE_WIDTH 32 +#define CH_STATUS_UPDATE_TIMEOUT 40 + +struct spdif_dev_data { + u32 mode; + u32 aclk; + bool rx_chsts_updated; + void __iomem *base; + struct clk *axi_clk; + wait_queue_head_t chsts_q; +}; + +static irqreturn_t xlnx_spdifrx_irq_handler(int irq, void *arg) +{ + u32 val; + struct spdif_dev_data *ctx = arg; + + val = readl(ctx->base + XSPDIF_IRQ_STS_REG); + if (val & XSPDIF_CH_STS_MASK) { + writel(val & XSPDIF_CH_STS_MASK, + ctx->base + XSPDIF_IRQ_STS_REG); + val = readl(ctx->base + + XSPDIF_IRQ_ENABLE_REG); + writel(val & ~XSPDIF_CH_STS_MASK, + ctx->base + XSPDIF_IRQ_ENABLE_REG); + + ctx->rx_chsts_updated = true; + wake_up_interruptible(&ctx->chsts_q); + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static int xlnx_spdif_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + u32 val; + struct spdif_dev_data *ctx = dev_get_drvdata(dai->dev); + + val = readl(ctx->base + XSPDIF_CONTROL_REG); + val |= XSPDIF_FIFO_FLUSH_MASK; + writel(val, ctx->base + XSPDIF_CONTROL_REG); + + if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { + writel(XSPDIF_CH_STS_MASK, + ctx->base + XSPDIF_IRQ_ENABLE_REG); + writel(XSPDIF_GLOBAL_IRQ_ENABLE, + ctx->base + XSPDIF_GLOBAL_IRQ_ENABLE_REG); + } + + return 0; +} + +static void xlnx_spdif_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct spdif_dev_data *ctx = dev_get_drvdata(dai->dev); + + writel(XSPDIF_SOFT_RESET_VALUE, ctx->base + XSPDIF_SOFT_RESET_REG); +} + +static int xlnx_spdif_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *dai) +{ + u32 val, clk_div, clk_cfg; + struct spdif_dev_data *ctx = dev_get_drvdata(dai->dev); + + clk_div = DIV_ROUND_CLOSEST(ctx->aclk, MAX_CHANNELS * AES_SAMPLE_WIDTH * + params_rate(params)); + + switch (clk_div) { + case 4: + clk_cfg = 0; + break; + case 8: + clk_cfg = 1; + break; + case 16: + clk_cfg = 2; + break; + case 24: + clk_cfg = 3; + break; + case 32: + clk_cfg = 4; + break; + case 48: + clk_cfg = 5; + break; + case 64: + clk_cfg = 6; + break; + default: + return -EINVAL; + } + + val = readl(ctx->base + XSPDIF_CONTROL_REG); + val &= ~XSPDIF_CLOCK_CONFIG_BITS_MASK; + val |= clk_cfg << XSPDIF_CLOCK_CONFIG_BITS_SHIFT; + writel(val, ctx->base + XSPDIF_CONTROL_REG); + + return 0; +} + +static int rx_stream_detect(struct snd_soc_dai *dai) +{ + int err; + struct spdif_dev_data *ctx = dev_get_drvdata(dai->dev); + unsigned long jiffies = msecs_to_jiffies(CH_STATUS_UPDATE_TIMEOUT); + + /* start capture only if stream is detected within 40ms timeout */ + err = wait_event_interruptible_timeout(ctx->chsts_q, + ctx->rx_chsts_updated, + jiffies); + if (!err) { + dev_err(dai->dev, "No streaming audio detected!\n"); + return -EINVAL; + } + ctx->rx_chsts_updated = false; + + return 0; +} + +static int xlnx_spdif_trigger(struct snd_pcm_substream *substream, int cmd, + struct snd_soc_dai *dai) +{ + u32 val; + int ret = 0; + struct spdif_dev_data *ctx = dev_get_drvdata(dai->dev); + + val = readl(ctx->base + XSPDIF_CONTROL_REG); + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + val |= XSPDIF_CORE_ENABLE_MASK; + writel(val, ctx->base + XSPDIF_CONTROL_REG); + if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) + ret = rx_stream_detect(dai); + break; + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + val &= ~XSPDIF_CORE_ENABLE_MASK; + writel(val, ctx->base + XSPDIF_CONTROL_REG); + break; + default: + ret = -EINVAL; + } + + return ret; +} + +static const struct snd_soc_dai_ops xlnx_spdif_dai_ops = { + .startup = xlnx_spdif_startup, + .shutdown = xlnx_spdif_shutdown, + .trigger = xlnx_spdif_trigger, + .hw_params = xlnx_spdif_hw_params, +}; + +static struct snd_soc_dai_driver xlnx_spdif_tx_dai = { + .name = "xlnx_spdif_tx", + .playback = { + .channels_min = 2, + .channels_max = 2, + .rates = XLNX_SPDIF_RATES, + .formats = XLNX_SPDIF_FORMATS, + }, + .ops = &xlnx_spdif_dai_ops, +}; + +static struct snd_soc_dai_driver xlnx_spdif_rx_dai = { + .name = "xlnx_spdif_rx", + .capture = { + .channels_min = 2, + .channels_max = 2, + .rates = XLNX_SPDIF_RATES, + .formats = XLNX_SPDIF_FORMATS, + }, + .ops = &xlnx_spdif_dai_ops, +}; + +static const struct snd_soc_component_driver xlnx_spdif_component = { + .name = "xlnx-spdif", +}; + +static const struct of_device_id xlnx_spdif_of_match[] = { + { .compatible = "xlnx,spdif-2.0", }, + {}, +}; +MODULE_DEVICE_TABLE(of, xlnx_spdif_of_match); + +static int xlnx_spdif_probe(struct platform_device *pdev) +{ + int ret; + struct resource *res; + struct snd_soc_dai_driver *dai_drv; + struct spdif_dev_data *ctx; + + struct device *dev = &pdev->dev; + struct device_node *node = dev->of_node; + + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ctx->axi_clk = devm_clk_get(dev, "s_axi_aclk"); + if (IS_ERR(ctx->axi_clk)) { + ret = PTR_ERR(ctx->axi_clk); + dev_err(dev, "failed to get s_axi_aclk(%d)\n", ret); + return ret; + } + ret = clk_prepare_enable(ctx->axi_clk); + if (ret) { + dev_err(dev, "failed to enable s_axi_aclk(%d)\n", ret); + return ret; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + ctx->base = devm_ioremap_resource(dev, res); + if (IS_ERR(ctx->base)) { + ret = PTR_ERR(ctx->base); + goto clk_err; + } + ret = of_property_read_u32(node, "xlnx,spdif-mode", &ctx->mode); + if (ret < 0) { + dev_err(dev, "cannot get SPDIF mode\n"); + goto clk_err; + } + if (ctx->mode) { + dai_drv = &xlnx_spdif_tx_dai; + } else { + res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (!res) { + dev_err(dev, "No IRQ resource found\n"); + ret = -ENODEV; + goto clk_err; + } + ret = devm_request_irq(dev, res->start, + xlnx_spdifrx_irq_handler, + 0, "XLNX_SPDIF_RX", ctx); + if (ret) { + dev_err(dev, "spdif rx irq request failed\n"); + ret = -ENODEV; + goto clk_err; + } + + init_waitqueue_head(&ctx->chsts_q); + dai_drv = &xlnx_spdif_rx_dai; + } + + ret = of_property_read_u32(node, "xlnx,aud_clk_i", &ctx->aclk); + if (ret < 0) { + dev_err(dev, "cannot get aud_clk_i value\n"); + goto clk_err; + } + + dev_set_drvdata(dev, ctx); + + ret = devm_snd_soc_register_component(dev, &xlnx_spdif_component, + dai_drv, 1); + if (ret) { + dev_err(dev, "SPDIF component registration failed\n"); + goto clk_err; + } + + writel(XSPDIF_SOFT_RESET_VALUE, ctx->base + XSPDIF_SOFT_RESET_REG); + dev_info(dev, "%s DAI registered\n", dai_drv->name); + +clk_err: + clk_disable_unprepare(ctx->axi_clk); + return ret; +} + +static int xlnx_spdif_remove(struct platform_device *pdev) +{ + struct spdif_dev_data *ctx = dev_get_drvdata(&pdev->dev); + + clk_disable_unprepare(ctx->axi_clk); + return 0; +} + +static struct platform_driver xlnx_spdif_driver = { + .driver = { + .name = "xlnx-spdif", + .of_match_table = xlnx_spdif_of_match, + }, + .probe = xlnx_spdif_probe, + .remove = xlnx_spdif_remove, +}; +module_platform_driver(xlnx_spdif_driver); + +MODULE_AUTHOR("Maruthi Srinivas Bayyavarapu maruthis@xilinx.com"); +MODULE_DESCRIPTION("XILINX SPDIF driver"); +MODULE_LICENSE("GPL v2");