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Diffstat (limited to 'sound/soc/s3c24xx/s3c-pcm.c')
-rw-r--r--sound/soc/s3c24xx/s3c-pcm.c552
1 files changed, 552 insertions, 0 deletions
diff --git a/sound/soc/s3c24xx/s3c-pcm.c b/sound/soc/s3c24xx/s3c-pcm.c
new file mode 100644
index 000000000000..9e61a7c2d9ac
--- /dev/null
+++ b/sound/soc/s3c24xx/s3c-pcm.c
@@ -0,0 +1,552 @@
+/* sound/soc/s3c24xx/s3c-pcm.c
+ *
+ * ALSA SoC Audio Layer - S3C PCM-Controller driver
+ *
+ * Copyright (c) 2009 Samsung Electronics Co. Ltd
+ * Author: Jaswinder Singh <jassi.brar@samsung.com>
+ * based upon I2S drivers by Ben Dooks.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/kernel.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include <plat/audio.h>
+#include <plat/dma.h>
+
+#include "s3c-dma.h"
+#include "s3c-pcm.h"
+
+static struct s3c2410_dma_client s3c_pcm_dma_client_out = {
+ .name = "PCM Stereo out"
+};
+
+static struct s3c2410_dma_client s3c_pcm_dma_client_in = {
+ .name = "PCM Stereo in"
+};
+
+static struct s3c_dma_params s3c_pcm_stereo_out[] = {
+ [0] = {
+ .client = &s3c_pcm_dma_client_out,
+ .dma_size = 4,
+ },
+ [1] = {
+ .client = &s3c_pcm_dma_client_out,
+ .dma_size = 4,
+ },
+};
+
+static struct s3c_dma_params s3c_pcm_stereo_in[] = {
+ [0] = {
+ .client = &s3c_pcm_dma_client_in,
+ .dma_size = 4,
+ },
+ [1] = {
+ .client = &s3c_pcm_dma_client_in,
+ .dma_size = 4,
+ },
+};
+
+static struct s3c_pcm_info s3c_pcm[2];
+
+static inline struct s3c_pcm_info *to_info(struct snd_soc_dai *cpu_dai)
+{
+ return cpu_dai->private_data;
+}
+
+static void s3c_pcm_snd_txctrl(struct s3c_pcm_info *pcm, int on)
+{
+ void __iomem *regs = pcm->regs;
+ u32 ctl, clkctl;
+
+ clkctl = readl(regs + S3C_PCM_CLKCTL);
+ ctl = readl(regs + S3C_PCM_CTL);
+ ctl &= ~(S3C_PCM_CTL_TXDIPSTICK_MASK
+ << S3C_PCM_CTL_TXDIPSTICK_SHIFT);
+
+ if (on) {
+ ctl |= S3C_PCM_CTL_TXDMA_EN;
+ ctl |= S3C_PCM_CTL_TXFIFO_EN;
+ ctl |= S3C_PCM_CTL_ENABLE;
+ ctl |= (0x20<<S3C_PCM_CTL_TXDIPSTICK_SHIFT);
+ clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
+ } else {
+ ctl &= ~S3C_PCM_CTL_TXDMA_EN;
+ ctl &= ~S3C_PCM_CTL_TXFIFO_EN;
+
+ if (!(ctl & S3C_PCM_CTL_RXFIFO_EN)) {
+ ctl &= ~S3C_PCM_CTL_ENABLE;
+ if (!pcm->idleclk)
+ clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
+ }
+ }
+
+ writel(clkctl, regs + S3C_PCM_CLKCTL);
+ writel(ctl, regs + S3C_PCM_CTL);
+}
+
+static void s3c_pcm_snd_rxctrl(struct s3c_pcm_info *pcm, int on)
+{
+ void __iomem *regs = pcm->regs;
+ u32 ctl, clkctl;
+
+ ctl = readl(regs + S3C_PCM_CTL);
+ clkctl = readl(regs + S3C_PCM_CLKCTL);
+
+ if (on) {
+ ctl |= S3C_PCM_CTL_RXDMA_EN;
+ ctl |= S3C_PCM_CTL_RXFIFO_EN;
+ ctl |= S3C_PCM_CTL_ENABLE;
+ clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
+ } else {
+ ctl &= ~S3C_PCM_CTL_RXDMA_EN;
+ ctl &= ~S3C_PCM_CTL_RXFIFO_EN;
+
+ if (!(ctl & S3C_PCM_CTL_TXFIFO_EN)) {
+ ctl &= ~S3C_PCM_CTL_ENABLE;
+ if (!pcm->idleclk)
+ clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
+ }
+ }
+
+ writel(clkctl, regs + S3C_PCM_CLKCTL);
+ writel(ctl, regs + S3C_PCM_CTL);
+}
+
+static int s3c_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct s3c_pcm_info *pcm = to_info(rtd->dai->cpu_dai);
+ unsigned long flags;
+
+ dev_dbg(pcm->dev, "Entered %s\n", __func__);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ spin_lock_irqsave(&pcm->lock, flags);
+
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ s3c_pcm_snd_rxctrl(pcm, 1);
+ else
+ s3c_pcm_snd_txctrl(pcm, 1);
+
+ spin_unlock_irqrestore(&pcm->lock, flags);
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ spin_lock_irqsave(&pcm->lock, flags);
+
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ s3c_pcm_snd_rxctrl(pcm, 0);
+ else
+ s3c_pcm_snd_txctrl(pcm, 0);
+
+ spin_unlock_irqrestore(&pcm->lock, flags);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int s3c_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *socdai)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_dai_link *dai = rtd->dai;
+ struct s3c_pcm_info *pcm = to_info(dai->cpu_dai);
+ void __iomem *regs = pcm->regs;
+ struct clk *clk;
+ int sclk_div, sync_div;
+ unsigned long flags;
+ u32 clkctl;
+
+ dev_dbg(pcm->dev, "Entered %s\n", __func__);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ dai->cpu_dai->dma_data = pcm->dma_playback;
+ else
+ dai->cpu_dai->dma_data = pcm->dma_capture;
+
+ /* Strictly check for sample size */
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&pcm->lock, flags);
+
+ /* Get hold of the PCMSOURCE_CLK */
+ clkctl = readl(regs + S3C_PCM_CLKCTL);
+ if (clkctl & S3C_PCM_CLKCTL_SERCLKSEL_PCLK)
+ clk = pcm->pclk;
+ else
+ clk = pcm->cclk;
+
+ /* Set the SCLK divider */
+ sclk_div = clk_get_rate(clk) / pcm->sclk_per_fs /
+ params_rate(params) / 2 - 1;
+
+ clkctl &= ~(S3C_PCM_CLKCTL_SCLKDIV_MASK
+ << S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
+ clkctl |= ((sclk_div & S3C_PCM_CLKCTL_SCLKDIV_MASK)
+ << S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
+
+ /* Set the SYNC divider */
+ sync_div = pcm->sclk_per_fs - 1;
+
+ clkctl &= ~(S3C_PCM_CLKCTL_SYNCDIV_MASK
+ << S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
+ clkctl |= ((sync_div & S3C_PCM_CLKCTL_SYNCDIV_MASK)
+ << S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
+
+ writel(clkctl, regs + S3C_PCM_CLKCTL);
+
+ spin_unlock_irqrestore(&pcm->lock, flags);
+
+ dev_dbg(pcm->dev, "PCMSOURCE_CLK-%lu SCLK=%ufs \
+ SCLK_DIV=%d SYNC_DIV=%d\n",
+ clk_get_rate(clk), pcm->sclk_per_fs,
+ sclk_div, sync_div);
+
+ return 0;
+}
+
+static int s3c_pcm_set_fmt(struct snd_soc_dai *cpu_dai,
+ unsigned int fmt)
+{
+ struct s3c_pcm_info *pcm = to_info(cpu_dai);
+ void __iomem *regs = pcm->regs;
+ unsigned long flags;
+ int ret = 0;
+ u32 ctl;
+
+ dev_dbg(pcm->dev, "Entered %s\n", __func__);
+
+ spin_lock_irqsave(&pcm->lock, flags);
+
+ ctl = readl(regs + S3C_PCM_CTL);
+
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_NB_NF:
+ /* Nothing to do, NB_NF by default */
+ break;
+ default:
+ dev_err(pcm->dev, "Unsupported clock inversion!\n");
+ ret = -EINVAL;
+ goto exit;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBS_CFS:
+ /* Nothing to do, Master by default */
+ break;
+ default:
+ dev_err(pcm->dev, "Unsupported master/slave format!\n");
+ ret = -EINVAL;
+ goto exit;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) {
+ case SND_SOC_DAIFMT_CONT:
+ pcm->idleclk = 1;
+ break;
+ case SND_SOC_DAIFMT_GATED:
+ pcm->idleclk = 0;
+ break;
+ default:
+ dev_err(pcm->dev, "Invalid Clock gating request!\n");
+ ret = -EINVAL;
+ goto exit;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_DSP_A:
+ ctl |= S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
+ ctl |= S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
+ break;
+ case SND_SOC_DAIFMT_DSP_B:
+ ctl &= ~S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
+ ctl &= ~S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
+ break;
+ default:
+ dev_err(pcm->dev, "Unsupported data format!\n");
+ ret = -EINVAL;
+ goto exit;
+ }
+
+ writel(ctl, regs + S3C_PCM_CTL);
+
+exit:
+ spin_unlock_irqrestore(&pcm->lock, flags);
+
+ return ret;
+}
+
+static int s3c_pcm_set_clkdiv(struct snd_soc_dai *cpu_dai,
+ int div_id, int div)
+{
+ struct s3c_pcm_info *pcm = to_info(cpu_dai);
+
+ switch (div_id) {
+ case S3C_PCM_SCLK_PER_FS:
+ pcm->sclk_per_fs = div;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int s3c_pcm_set_sysclk(struct snd_soc_dai *cpu_dai,
+ int clk_id, unsigned int freq, int dir)
+{
+ struct s3c_pcm_info *pcm = to_info(cpu_dai);
+ void __iomem *regs = pcm->regs;
+ u32 clkctl = readl(regs + S3C_PCM_CLKCTL);
+
+ switch (clk_id) {
+ case S3C_PCM_CLKSRC_PCLK:
+ clkctl |= S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
+ break;
+
+ case S3C_PCM_CLKSRC_MUX:
+ clkctl &= ~S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
+
+ if (clk_get_rate(pcm->cclk) != freq)
+ clk_set_rate(pcm->cclk, freq);
+
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ writel(clkctl, regs + S3C_PCM_CLKCTL);
+
+ return 0;
+}
+
+static struct snd_soc_dai_ops s3c_pcm_dai_ops = {
+ .set_sysclk = s3c_pcm_set_sysclk,
+ .set_clkdiv = s3c_pcm_set_clkdiv,
+ .trigger = s3c_pcm_trigger,
+ .hw_params = s3c_pcm_hw_params,
+ .set_fmt = s3c_pcm_set_fmt,
+};
+
+#define S3C_PCM_RATES SNDRV_PCM_RATE_8000_96000
+
+#define S3C_PCM_DECLARE(n) \
+{ \
+ .name = "samsung-pcm", \
+ .id = (n), \
+ .symmetric_rates = 1, \
+ .ops = &s3c_pcm_dai_ops, \
+ .playback = { \
+ .channels_min = 2, \
+ .channels_max = 2, \
+ .rates = S3C_PCM_RATES, \
+ .formats = SNDRV_PCM_FMTBIT_S16_LE, \
+ }, \
+ .capture = { \
+ .channels_min = 2, \
+ .channels_max = 2, \
+ .rates = S3C_PCM_RATES, \
+ .formats = SNDRV_PCM_FMTBIT_S16_LE, \
+ }, \
+}
+
+struct snd_soc_dai s3c_pcm_dai[] = {
+ S3C_PCM_DECLARE(0),
+ S3C_PCM_DECLARE(1),
+};
+EXPORT_SYMBOL_GPL(s3c_pcm_dai);
+
+static __devinit int s3c_pcm_dev_probe(struct platform_device *pdev)
+{
+ struct s3c_pcm_info *pcm;
+ struct snd_soc_dai *dai;
+ struct resource *mem_res, *dmatx_res, *dmarx_res;
+ struct s3c_audio_pdata *pcm_pdata;
+ int ret;
+
+ /* Check for valid device index */
+ if ((pdev->id < 0) || pdev->id >= ARRAY_SIZE(s3c_pcm)) {
+ dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
+ return -EINVAL;
+ }
+
+ pcm_pdata = pdev->dev.platform_data;
+
+ /* Check for availability of necessary resource */
+ dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ if (!dmatx_res) {
+ dev_err(&pdev->dev, "Unable to get PCM-TX dma resource\n");
+ return -ENXIO;
+ }
+
+ dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+ if (!dmarx_res) {
+ dev_err(&pdev->dev, "Unable to get PCM-RX dma resource\n");
+ return -ENXIO;
+ }
+
+ mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!mem_res) {
+ dev_err(&pdev->dev, "Unable to get register resource\n");
+ return -ENXIO;
+ }
+
+ if (pcm_pdata && pcm_pdata->cfg_gpio && pcm_pdata->cfg_gpio(pdev)) {
+ dev_err(&pdev->dev, "Unable to configure gpio\n");
+ return -EINVAL;
+ }
+
+ pcm = &s3c_pcm[pdev->id];
+ pcm->dev = &pdev->dev;
+
+ spin_lock_init(&pcm->lock);
+
+ dai = &s3c_pcm_dai[pdev->id];
+ dai->dev = &pdev->dev;
+
+ /* Default is 128fs */
+ pcm->sclk_per_fs = 128;
+
+ pcm->cclk = clk_get(&pdev->dev, "audio-bus");
+ if (IS_ERR(pcm->cclk)) {
+ dev_err(&pdev->dev, "failed to get audio-bus\n");
+ ret = PTR_ERR(pcm->cclk);
+ goto err1;
+ }
+ clk_enable(pcm->cclk);
+
+ /* record our pcm structure for later use in the callbacks */
+ dai->private_data = pcm;
+
+ if (!request_mem_region(mem_res->start,
+ resource_size(mem_res), "samsung-pcm")) {
+ dev_err(&pdev->dev, "Unable to request register region\n");
+ ret = -EBUSY;
+ goto err2;
+ }
+
+ pcm->regs = ioremap(mem_res->start, 0x100);
+ if (pcm->regs == NULL) {
+ dev_err(&pdev->dev, "cannot ioremap registers\n");
+ ret = -ENXIO;
+ goto err3;
+ }
+
+ pcm->pclk = clk_get(&pdev->dev, "pcm");
+ if (IS_ERR(pcm->pclk)) {
+ dev_err(&pdev->dev, "failed to get pcm_clock\n");
+ ret = -ENOENT;
+ goto err4;
+ }
+ clk_enable(pcm->pclk);
+
+ ret = snd_soc_register_dai(dai);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "failed to get pcm_clock\n");
+ goto err5;
+ }
+
+ s3c_pcm_stereo_in[pdev->id].dma_addr = mem_res->start
+ + S3C_PCM_RXFIFO;
+ s3c_pcm_stereo_out[pdev->id].dma_addr = mem_res->start
+ + S3C_PCM_TXFIFO;
+
+ s3c_pcm_stereo_in[pdev->id].channel = dmarx_res->start;
+ s3c_pcm_stereo_out[pdev->id].channel = dmatx_res->start;
+
+ pcm->dma_capture = &s3c_pcm_stereo_in[pdev->id];
+ pcm->dma_playback = &s3c_pcm_stereo_out[pdev->id];
+
+ return 0;
+
+err5:
+ clk_disable(pcm->pclk);
+ clk_put(pcm->pclk);
+err4:
+ iounmap(pcm->regs);
+err3:
+ release_mem_region(mem_res->start, resource_size(mem_res));
+err2:
+ clk_disable(pcm->cclk);
+ clk_put(pcm->cclk);
+err1:
+ return ret;
+}
+
+static __devexit int s3c_pcm_dev_remove(struct platform_device *pdev)
+{
+ struct s3c_pcm_info *pcm = &s3c_pcm[pdev->id];
+ struct resource *mem_res;
+
+ iounmap(pcm->regs);
+
+ mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ release_mem_region(mem_res->start, resource_size(mem_res));
+
+ clk_disable(pcm->cclk);
+ clk_disable(pcm->pclk);
+ clk_put(pcm->pclk);
+ clk_put(pcm->cclk);
+
+ return 0;
+}
+
+static struct platform_driver s3c_pcm_driver = {
+ .probe = s3c_pcm_dev_probe,
+ .remove = s3c_pcm_dev_remove,
+ .driver = {
+ .name = "samsung-pcm",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init s3c_pcm_init(void)
+{
+ return platform_driver_register(&s3c_pcm_driver);
+}
+module_init(s3c_pcm_init);
+
+static void __exit s3c_pcm_exit(void)
+{
+ platform_driver_unregister(&s3c_pcm_driver);
+}
+module_exit(s3c_pcm_exit);
+
+/* Module information */
+MODULE_AUTHOR("Jaswinder Singh, <jassi.brar@samsung.com>");
+MODULE_DESCRIPTION("S3C PCM Controller Driver");
+MODULE_LICENSE("GPL");