/*
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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 <vipin.kumar@st.com>
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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 <vipin.kumar@st.com>");
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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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