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274 lines
6.7 KiB
274 lines
6.7 KiB
/* |
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* ALSA SoC SPDIF In Audio Layer for spear processors |
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* |
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* Copyright (C) 2012 ST Microelectronics |
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* Vipin Kumar <[email protected]> |
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* |
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* This file is licensed under the terms of the GNU General Public |
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* License version 2. This program is licensed "as is" without any |
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* warranty of any kind, whether express or implied. |
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*/ |
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#include <linux/clk.h> |
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#include <linux/delay.h> |
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#include <linux/device.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/io.h> |
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#include <linux/ioport.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <sound/dmaengine_pcm.h> |
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#include <sound/pcm.h> |
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#include <sound/pcm_params.h> |
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#include <sound/soc.h> |
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#include <sound/spear_dma.h> |
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#include <sound/spear_spdif.h> |
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#include "spdif_in_regs.h" |
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#include "spear_pcm.h" |
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struct spdif_in_params { |
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u32 format; |
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}; |
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struct spdif_in_dev { |
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struct clk *clk; |
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struct spear_dma_data dma_params; |
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struct spdif_in_params saved_params; |
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void *io_base; |
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struct device *dev; |
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void (*reset_perip)(void); |
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int irq; |
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struct snd_dmaengine_dai_dma_data dma_params_rx; |
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struct snd_dmaengine_pcm_config config; |
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}; |
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static void spdif_in_configure(struct spdif_in_dev *host) |
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{ |
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u32 ctrl = SPDIF_IN_PRTYEN | SPDIF_IN_STATEN | SPDIF_IN_USREN | |
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SPDIF_IN_VALEN | SPDIF_IN_BLKEN; |
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ctrl |= SPDIF_MODE_16BIT | SPDIF_FIFO_THRES_16; |
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writel(ctrl, host->io_base + SPDIF_IN_CTRL); |
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writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK); |
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} |
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static int spdif_in_dai_probe(struct snd_soc_dai *dai) |
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{ |
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struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); |
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host->dma_params_rx.filter_data = &host->dma_params; |
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dai->capture_dma_data = &host->dma_params_rx; |
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return 0; |
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} |
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static void spdif_in_shutdown(struct snd_pcm_substream *substream, |
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struct snd_soc_dai *dai) |
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{ |
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struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); |
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if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) |
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return; |
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writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK); |
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} |
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static void spdif_in_format(struct spdif_in_dev *host, u32 format) |
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{ |
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u32 ctrl = readl(host->io_base + SPDIF_IN_CTRL); |
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switch (format) { |
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case SNDRV_PCM_FORMAT_S16_LE: |
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ctrl |= SPDIF_XTRACT_16BIT; |
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break; |
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case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE: |
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ctrl &= ~SPDIF_XTRACT_16BIT; |
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break; |
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} |
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writel(ctrl, host->io_base + SPDIF_IN_CTRL); |
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} |
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static int spdif_in_hw_params(struct snd_pcm_substream *substream, |
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struct snd_pcm_hw_params *params, |
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struct snd_soc_dai *dai) |
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{ |
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struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); |
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u32 format; |
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if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) |
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return -EINVAL; |
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format = params_format(params); |
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host->saved_params.format = format; |
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return 0; |
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} |
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static int spdif_in_trigger(struct snd_pcm_substream *substream, int cmd, |
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struct snd_soc_dai *dai) |
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{ |
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struct spdif_in_dev *host = snd_soc_dai_get_drvdata(dai); |
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u32 ctrl; |
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int ret = 0; |
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if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) |
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return -EINVAL; |
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switch (cmd) { |
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case SNDRV_PCM_TRIGGER_START: |
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case SNDRV_PCM_TRIGGER_RESUME: |
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case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
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clk_enable(host->clk); |
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spdif_in_configure(host); |
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spdif_in_format(host, host->saved_params.format); |
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ctrl = readl(host->io_base + SPDIF_IN_CTRL); |
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ctrl |= SPDIF_IN_SAMPLE | SPDIF_IN_ENB; |
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writel(ctrl, host->io_base + SPDIF_IN_CTRL); |
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writel(0xF, host->io_base + SPDIF_IN_IRQ_MASK); |
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break; |
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case SNDRV_PCM_TRIGGER_STOP: |
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case SNDRV_PCM_TRIGGER_SUSPEND: |
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
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ctrl = readl(host->io_base + SPDIF_IN_CTRL); |
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ctrl &= ~(SPDIF_IN_SAMPLE | SPDIF_IN_ENB); |
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writel(ctrl, host->io_base + SPDIF_IN_CTRL); |
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writel(0x0, host->io_base + SPDIF_IN_IRQ_MASK); |
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if (host->reset_perip) |
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host->reset_perip(); |
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clk_disable(host->clk); |
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break; |
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default: |
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ret = -EINVAL; |
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break; |
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} |
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return ret; |
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} |
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static const struct snd_soc_dai_ops spdif_in_dai_ops = { |
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.shutdown = spdif_in_shutdown, |
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.trigger = spdif_in_trigger, |
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.hw_params = spdif_in_hw_params, |
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}; |
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static struct snd_soc_dai_driver spdif_in_dai = { |
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.probe = spdif_in_dai_probe, |
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.capture = { |
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.channels_min = 2, |
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.channels_max = 2, |
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.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ |
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SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 | \ |
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SNDRV_PCM_RATE_192000), |
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.formats = SNDRV_PCM_FMTBIT_S16_LE | \ |
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SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE, |
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}, |
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.ops = &spdif_in_dai_ops, |
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}; |
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static const struct snd_soc_component_driver spdif_in_component = { |
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.name = "spdif-in", |
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}; |
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static irqreturn_t spdif_in_irq(int irq, void *arg) |
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{ |
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struct spdif_in_dev *host = (struct spdif_in_dev *)arg; |
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u32 irq_status = readl(host->io_base + SPDIF_IN_IRQ); |
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if (!irq_status) |
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return IRQ_NONE; |
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if (irq_status & SPDIF_IRQ_FIFOWRITE) |
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dev_err(host->dev, "spdif in: fifo write error"); |
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if (irq_status & SPDIF_IRQ_EMPTYFIFOREAD) |
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dev_err(host->dev, "spdif in: empty fifo read error"); |
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if (irq_status & SPDIF_IRQ_FIFOFULL) |
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dev_err(host->dev, "spdif in: fifo full error"); |
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if (irq_status & SPDIF_IRQ_OUTOFRANGE) |
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dev_err(host->dev, "spdif in: out of range error"); |
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writel(0, host->io_base + SPDIF_IN_IRQ); |
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return IRQ_HANDLED; |
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} |
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static int spdif_in_probe(struct platform_device *pdev) |
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{ |
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struct spdif_in_dev *host; |
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struct spear_spdif_platform_data *pdata; |
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struct resource *res_fifo; |
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void __iomem *io_base; |
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int ret; |
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io_base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(io_base)) |
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return PTR_ERR(io_base); |
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res_fifo = platform_get_resource(pdev, IORESOURCE_IO, 0); |
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if (!res_fifo) |
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return -EINVAL; |
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host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL); |
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if (!host) |
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return -ENOMEM; |
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host->io_base = io_base; |
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host->irq = platform_get_irq(pdev, 0); |
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if (host->irq < 0) { |
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dev_warn(&pdev->dev, "failed to get IRQ: %d\n", host->irq); |
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return host->irq; |
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} |
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host->clk = devm_clk_get(&pdev->dev, NULL); |
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if (IS_ERR(host->clk)) |
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return PTR_ERR(host->clk); |
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pdata = dev_get_platdata(&pdev->dev); |
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if (!pdata) |
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return -EINVAL; |
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host->dma_params.data = pdata->dma_params; |
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host->dma_params.addr = res_fifo->start; |
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host->dma_params.max_burst = 16; |
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host->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; |
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host->reset_perip = pdata->reset_perip; |
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host->dev = &pdev->dev; |
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dev_set_drvdata(&pdev->dev, host); |
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ret = devm_request_irq(&pdev->dev, host->irq, spdif_in_irq, 0, |
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"spdif-in", host); |
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if (ret) { |
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dev_warn(&pdev->dev, "request_irq failed\n"); |
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return ret; |
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} |
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ret = devm_snd_soc_register_component(&pdev->dev, &spdif_in_component, |
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&spdif_in_dai, 1); |
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if (ret) |
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return ret; |
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return devm_spear_pcm_platform_register(&pdev->dev, &host->config, |
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pdata->filter); |
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} |
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static struct platform_driver spdif_in_driver = { |
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.probe = spdif_in_probe, |
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.driver = { |
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.name = "spdif-in", |
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}, |
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}; |
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module_platform_driver(spdif_in_driver); |
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MODULE_AUTHOR("Vipin Kumar <[email protected]>"); |
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MODULE_DESCRIPTION("SPEAr SPDIF IN SoC Interface"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:spdif_in");
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