[alsa-devel] [PATCH v2 1/4] dt: Add bindings documentation for the ADI AXI-I2S controller

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Lars-Peter Clausen

6 Dec 2013 6 Dec '13

11:02 a.m.

This patch adds the devicetree documentation for the ADI AXI-SPDIF audio controller. The controller has: * One set of memory mapped register * Two clocks, one for the memory mapped register interface, one used as the audio reference clock * One DMA interface each for the transmit and receive data

Signed-off-by: Lars-Peter Clausen lars@metafoo.de Cc: Rob Herring rob.herring@calxeda.com Cc: Pawel Moll pawel.moll@arm.com Cc: Mark Rutland mark.rutland@arm.com Cc: Stephen Warren swarren@wwwdotorg.org Cc: Ian Campbell ijc+devicetree@hellion.org.uk Cc: devicetree@vger.kernel.org

--- Changes since v1: * Use <&a ...>, <&b ...> instead of <&a ..., &b ...> in the examples --- .../devicetree/bindings/sound/adi,axi-i2s.txt | 31 ++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/adi,axi-i2s.txt

diff --git a/Documentation/devicetree/bindings/sound/adi,axi-i2s.txt b/Documentation/devicetree/bindings/sound/adi,axi-i2s.txt new file mode 100644 index 0000000..5875ca4 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/adi,axi-i2s.txt @@ -0,0 +1,31 @@ +ADI AXI-I2S controller + +Required properties: + - compatible : Must be "adi,axi-i2s-1.00.a" + - reg : Must contain I2S core's registers location and length + - clocks : Pairs of phandle and specifier referencing the controller's clocks. + The controller expects two clocks, the clock used for the AXI interface and + the clock used as the sampling rate reference clock sample. + - clock-names : "axi" for the clock to the AXI interface, "ref" for the sample + rate reference clock. + - dmas: Pairs of phandle and specifier for the DMA channels that are used by + the core. The core expects two dma channels, one for transmit and one for + receive. + - dma-names : "tx" for the transmit channel, "rx" for the receive channel. + +For more details on the 'dma', 'dma-names', 'clock' and 'clock-names' properties +please check: + * resource-names.txt + * clock/clock-bindings.txt + * dma/dma.txt + +Example: + + i2s: i2s@0x77600000 { + compatible = "adi,axi-i2s-1.00.a"; + reg = <0x77600000 0x1000>; + clocks = <&clk 15>, <&audio_clock>; + clock-names = "axi", "ref"; + dmas = <&ps7_dma 0>, <&ps7_dma 1>; + dma-names = "tx", "rx"; + };

-- 1.8.0

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Lars-Peter Clausen

6 Dec 6 Dec

11:02 a.m.

New subject: [alsa-devel] [PATCH v2 2/4] ASoC: Add support for the Analog Devices AXI-I2S core

This patch adds support for the AXI-I2S softcore. The core implements a simple bidirectional I2S transceiver and is used by Analog Devices in some of their reference designs for various FPGA platforms.

The driver uses the generic PCM dmaengine driver for its PCM. The only restriction is that we need to set the SND_DMAENGINE_PCM_FLAG_NO_RESIDUE flag as the dmaengine driver for the DMA core (PL330) that is used with this core has no residue reporting capabilities yet. This will be fixed in the future though.

Signed-off-by: Lars-Peter Clausen lars@metafoo.de

--- Changes since v1: * Remove explicit dependency on SND_SOC since there already is an implicit one. * Added clarifications on the programable I2S word width that is currently hardcoded to 32 --- sound/soc/Kconfig | 1 + sound/soc/Makefile | 1 + sound/soc/adi/Kconfig | 13 +++ sound/soc/adi/Makefile | 3 + sound/soc/adi/axi-i2s.c | 277 ++++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 295 insertions(+) create mode 100644 sound/soc/adi/Kconfig create mode 100644 sound/soc/adi/Makefile create mode 100644 sound/soc/adi/axi-i2s.c

diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig index a5dcdec..d62ce48 100644 --- a/sound/soc/Kconfig +++ b/sound/soc/Kconfig @@ -31,6 +31,7 @@ config SND_SOC_GENERIC_DMAENGINE_PCM select SND_DMAENGINE_PCM

# All the supported SoCs +source "sound/soc/adi/Kconfig" source "sound/soc/atmel/Kconfig" source "sound/soc/au1x/Kconfig" source "sound/soc/bcm/Kconfig" diff --git a/sound/soc/Makefile b/sound/soc/Makefile index bf32b7a..62a1822 100644 --- a/sound/soc/Makefile +++ b/sound/soc/Makefile @@ -8,6 +8,7 @@ endif obj-$(CONFIG_SND_SOC) += snd-soc-core.o obj-$(CONFIG_SND_SOC) += codecs/ obj-$(CONFIG_SND_SOC) += generic/ +obj-$(CONFIG_SND_SOC) += adi/ obj-$(CONFIG_SND_SOC) += atmel/ obj-$(CONFIG_SND_SOC) += au1x/ obj-$(CONFIG_SND_SOC) += bcm/ diff --git a/sound/soc/adi/Kconfig b/sound/soc/adi/Kconfig new file mode 100644 index 0000000..46f4b79 --- /dev/null +++ b/sound/soc/adi/Kconfig @@ -0,0 +1,13 @@ +config SND_SOC_ADI + tristate "Audio support for Analog Devices reference designs" + depends on MICROBLAZE || ARCH_ZYNQ || COMPILE_TEST + help + Audio support for various reference designs by Analog Devices. + +config SND_SOC_ADI_AXI_I2S + tristate "AXI-I2S support" + depends on SND_SOC_ADI + select SND_SOC_GENERIC_DMAENGINE_PCM + select REGMAP_MMIO + help + ASoC driver for the Analog Devices AXI-I2S softcore peripheral. diff --git a/sound/soc/adi/Makefile b/sound/soc/adi/Makefile new file mode 100644 index 0000000..d32c21a --- /dev/null +++ b/sound/soc/adi/Makefile @@ -0,0 +1,3 @@ +snd-soc-adi-axi-i2s-objs := axi-i2s.o + +obj-$(CONFIG_SND_SOC_ADI_AXI_I2S) += snd-soc-adi-axi-i2s.o diff --git a/sound/soc/adi/axi-i2s.c b/sound/soc/adi/axi-i2s.c new file mode 100644 index 0000000..0822c77 --- /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_request_and_ioremap(&pdev->dev, res); + if (!base) + return -EBUSY; + + 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, + SND_DMAENGINE_PCM_FLAG_NO_RESIDUE); + if (ret) + goto err_clk_disable; + +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", + .owner = THIS_MODULE, + .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");

-- 1.8.0

Lars-Peter Clausen

11:02 a.m.

New subject: [alsa-devel] [PATCH v2 3/4] dt: Add bindings documentation for the ADI AXI-SPDIF audio controller

--- Changes since v1: * Use <&a ...>, <&b ...> instead of <&a ..., &b ...> in the examples --- .../devicetree/bindings/sound/adi,axi-spdif-tx.txt | 30 ++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/adi,axi-spdif-tx.txt

diff --git a/Documentation/devicetree/bindings/sound/adi,axi-spdif-tx.txt b/Documentation/devicetree/bindings/sound/adi,axi-spdif-tx.txt new file mode 100644 index 0000000..46f3449 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/adi,axi-spdif-tx.txt @@ -0,0 +1,30 @@ +ADI AXI-SPDIF controller + +Required properties: + - compatible : Must be "adi,axi-spdif-1.00.a" + - reg : Must contain SPDIF core's registers location and length + - clocks : Pairs of phandle and specifier referencing the controller's clocks. + The controller expects two clocks, the clock used for the AXI interface and + the clock used as the sampling rate reference clock sample. + - clock-names: "axi" for the clock to the AXI interface, "ref" for the sample + rate reference clock. + - dmas: Pairs of phandle and specifier for the DMA channel that is used by + the core. The core expects one dma channel for transmit. + - dma-names : Must be "tx" + +For more details on the 'dma', 'dma-names', 'clock' and 'clock-names' properties +please check: + * resource-names.txt + * clock/clock-bindings.txt + * dma/dma.txt + +Example: + + spdif: spdif@0x77400000 { + compatible = "adi,axi-spdif-tx-1.00.a"; + reg = <0x77600000 0x1000>; + clocks = <&clk 15>, <&audio_clock>; + clock-names = "axi", "ref"; + dmas = <&ps7_dma 0>; + dma-names = "tx"; + };

-- 1.8.0

Lars-Peter Clausen

11:02 a.m.

New subject: [alsa-devel] [PATCH v2 4/4] ASoC: Add support for the Analog Devices AXI-SPDIF driver

This patch adds a ASoC driver for the AXI-SPDIF softcore. The core implements a simple SPDIF transmitter and is used on some Analog Devices' reference designs for various FPGA platforms. For now the driver only support the PL330 as the the DMA controller.

Signed-off-by: Lars-Peter Clausen lars@metafoo.de --- No changes since v1 --- sound/soc/adi/Kconfig | 8 ++ sound/soc/adi/Makefile | 2 + sound/soc/adi/axi-spdif.c | 272 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 282 insertions(+) create mode 100644 sound/soc/adi/axi-spdif.c

diff --git a/sound/soc/adi/Kconfig b/sound/soc/adi/Kconfig index 46f4b79..dd763f5 100644 --- a/sound/soc/adi/Kconfig +++ b/sound/soc/adi/Kconfig @@ -11,3 +11,11 @@ config SND_SOC_ADI_AXI_I2S select REGMAP_MMIO help ASoC driver for the Analog Devices AXI-I2S softcore peripheral. + +config SND_SOC_ADI_AXI_SPDIF + tristate "AXI-SPDIF support" + depends on SND_SOC_ADI + select SND_SOC_GENERIC_DMAENGINE_PCM + select REGMAP_MMIO + help + ASoC driver for the Analog Devices AXI-SPDIF softcore peripheral. diff --git a/sound/soc/adi/Makefile b/sound/soc/adi/Makefile index d32c21a..64456c1 100644 --- a/sound/soc/adi/Makefile +++ b/sound/soc/adi/Makefile @@ -1,3 +1,5 @@ snd-soc-adi-axi-i2s-objs := axi-i2s.o +snd-soc-adi-axi-spdif-objs := axi-spdif.o

obj-$(CONFIG_SND_SOC_ADI_AXI_I2S) += snd-soc-adi-axi-i2s.o +obj-$(CONFIG_SND_SOC_ADI_AXI_SPDIF) += snd-soc-adi-axi-spdif.o diff --git a/sound/soc/adi/axi-spdif.c b/sound/soc/adi/axi-spdif.c new file mode 100644 index 0000000..d5408d2 --- /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_request_and_ioremap(&pdev->dev, res); + if (!base) + return -EBUSY; + + 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");

-- 1.8.0