From 8f2fe346822419ee729c081b71c8835b733e0884 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Fri, 6 Dec 2013 11:02:50 +0100 Subject: 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 Signed-off-by: Mark Brown --- sound/soc/adi/axi-i2s.c | 277 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 277 insertions(+) create mode 100644 sound/soc/adi/axi-i2s.c (limited to 'sound/soc/adi/axi-i2s.c') diff --git a/sound/soc/adi/axi-i2s.c b/sound/soc/adi/axi-i2s.c new file mode 100644 index 000000000000..0822c7713669 --- /dev/null +++ b/sound/soc/adi/axi-i2s.c @@ -0,0 +1,277 @@ +/* + * Copyright (C) 2012-2013, Analog Devices Inc. + * Author: Lars-Peter Clausen + * + * Licensed under the GPL-2. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +#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 "); +MODULE_DESCRIPTION("AXI I2S driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.1 From 7fd7a48bd584a66cc4b0e3b92bb75b061578e19e Mon Sep 17 00:00:00 2001 From: Fengguang Wu Date: Mon, 16 Dec 2013 13:07:23 +0100 Subject: ASoC: axi-spdif: Use devm_ioremap_resource() instead of devm_request_and_ioremap() devm_request_and_ioremap() has been deprecated in favour of devm_ioremap_resource(). Fixes the following coccinelle warning: sound/soc/adi/axi-i2s.c:195:8-32: ERROR: deprecated devm_request_and_ioremap() API used on line 195 Generated by: coccinelle/api/devm_ioremap_resource.cocci Signed-off-by: Fengguang Wu Signed-off-by: Lars-Peter Clausen Signed-off-by: Mark Brown --- sound/soc/adi/axi-i2s.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'sound/soc/adi/axi-i2s.c') diff --git a/sound/soc/adi/axi-i2s.c b/sound/soc/adi/axi-i2s.c index 0822c7713669..7f91a86dd734 100644 --- a/sound/soc/adi/axi-i2s.c +++ b/sound/soc/adi/axi-i2s.c @@ -192,9 +192,9 @@ static int axi_i2s_probe(struct platform_device *pdev) 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; + 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); -- cgit v1.2.1