ASoC: mmp: add sspa support
The SSPA is a configurable multi-channel audio serial (TDM) interface.
It's configurable at runtime to support up to 128 channels and the
number of bits per sample: 8, 12, 16, 20, 24 and 32 bits. It also
support stereo format: I2S, left-justified or right-justified.
Signed-off-by: Zhangfei Gao <zhangfei.gao@marvell.com>
Signed-off-by: Leo Yan <leoy@marvell.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/pxa/mmp-sspa.c b/sound/soc/pxa/mmp-sspa.c
new file mode 100644
index 0000000..4d6cb8a
--- /dev/null
+++ b/sound/soc/pxa/mmp-sspa.c
@@ -0,0 +1,480 @@
+/*
+ * linux/sound/soc/pxa/mmp-sspa.c
+ * Base on pxa2xx-ssp.c
+ *
+ * Copyright (C) 2011 Marvell International Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/slab.h>
+#include <linux/pxa2xx_ssp.h>
+#include <linux/io.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/pxa2xx-lib.h>
+#include "mmp-sspa.h"
+
+/*
+ * SSPA audio private data
+ */
+struct sspa_priv {
+ struct ssp_device *sspa;
+ struct pxa2xx_pcm_dma_params *dma_params;
+ struct clk *audio_clk;
+ struct clk *sysclk;
+ int dai_fmt;
+ int running_cnt;
+};
+
+static void mmp_sspa_write_reg(struct ssp_device *sspa, u32 reg, u32 val)
+{
+ __raw_writel(val, sspa->mmio_base + reg);
+}
+
+static u32 mmp_sspa_read_reg(struct ssp_device *sspa, u32 reg)
+{
+ return __raw_readl(sspa->mmio_base + reg);
+}
+
+static void mmp_sspa_tx_enable(struct ssp_device *sspa)
+{
+ unsigned int sspa_sp;
+
+ sspa_sp = mmp_sspa_read_reg(sspa, SSPA_TXSP);
+ sspa_sp |= SSPA_SP_S_EN;
+ sspa_sp |= SSPA_SP_WEN;
+ mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
+}
+
+static void mmp_sspa_tx_disable(struct ssp_device *sspa)
+{
+ unsigned int sspa_sp;
+
+ sspa_sp = mmp_sspa_read_reg(sspa, SSPA_TXSP);
+ sspa_sp &= ~SSPA_SP_S_EN;
+ sspa_sp |= SSPA_SP_WEN;
+ mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
+}
+
+static void mmp_sspa_rx_enable(struct ssp_device *sspa)
+{
+ unsigned int sspa_sp;
+
+ sspa_sp = mmp_sspa_read_reg(sspa, SSPA_RXSP);
+ sspa_sp |= SSPA_SP_S_EN;
+ sspa_sp |= SSPA_SP_WEN;
+ mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
+}
+
+static void mmp_sspa_rx_disable(struct ssp_device *sspa)
+{
+ unsigned int sspa_sp;
+
+ sspa_sp = mmp_sspa_read_reg(sspa, SSPA_RXSP);
+ sspa_sp &= ~SSPA_SP_S_EN;
+ sspa_sp |= SSPA_SP_WEN;
+ mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
+}
+
+static int mmp_sspa_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct sspa_priv *priv = snd_soc_dai_get_drvdata(dai);
+
+ clk_enable(priv->sysclk);
+ clk_enable(priv->sspa->clk);
+
+ return 0;
+}
+
+static void mmp_sspa_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct sspa_priv *priv = snd_soc_dai_get_drvdata(dai);
+
+ clk_disable(priv->sspa->clk);
+ clk_disable(priv->sysclk);
+
+ return;
+}
+
+/*
+ * Set the SSP ports SYSCLK.
+ */
+static int mmp_sspa_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
+ int clk_id, unsigned int freq, int dir)
+{
+ struct sspa_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
+ int ret = 0;
+
+ switch (clk_id) {
+ case MMP_SSPA_CLK_AUDIO:
+ ret = clk_set_rate(priv->audio_clk, freq);
+ if (ret)
+ return ret;
+ break;
+ case MMP_SSPA_CLK_PLL:
+ case MMP_SSPA_CLK_VCXO:
+ /* not support yet */
+ return -EINVAL;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int mmp_sspa_set_dai_pll(struct snd_soc_dai *cpu_dai, int pll_id,
+ int source, unsigned int freq_in,
+ unsigned int freq_out)
+{
+ struct sspa_priv *priv = snd_soc_dai_get_drvdata(cpu_dai);
+ int ret = 0;
+
+ switch (pll_id) {
+ case MMP_SYSCLK:
+ ret = clk_set_rate(priv->sysclk, freq_out);
+ if (ret)
+ return ret;
+ break;
+ case MMP_SSPA_CLK:
+ ret = clk_set_rate(priv->sspa->clk, freq_out);
+ if (ret)
+ return ret;
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+/*
+ * Set up the sspa dai format. The sspa port must be inactive
+ * before calling this function as the physical
+ * interface format is changed.
+ */
+static int mmp_sspa_set_dai_fmt(struct snd_soc_dai *cpu_dai,
+ unsigned int fmt)
+{
+ struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(cpu_dai);
+ struct ssp_device *sspa = sspa_priv->sspa;
+ u32 sspa_sp, sspa_ctrl;
+
+ /* check if we need to change anything at all */
+ if (sspa_priv->dai_fmt == fmt)
+ return 0;
+
+ /* we can only change the settings if the port is not in use */
+ if ((mmp_sspa_read_reg(sspa, SSPA_TXSP) & SSPA_SP_S_EN) ||
+ (mmp_sspa_read_reg(sspa, SSPA_RXSP) & SSPA_SP_S_EN)) {
+ dev_err(&sspa->pdev->dev,
+ "can't change hardware dai format: stream is in use\n");
+ return -EINVAL;
+ }
+
+ /* reset port settings */
+ sspa_sp = SSPA_SP_WEN | SSPA_SP_S_RST | SSPA_SP_FFLUSH;
+ sspa_ctrl = 0;
+
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBS_CFS:
+ sspa_sp |= SSPA_SP_MSL;
+ break;
+ case SND_SOC_DAIFMT_CBM_CFM:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_NB_NF:
+ sspa_sp |= SSPA_SP_FSP;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ sspa_sp |= SSPA_TXSP_FPER(63);
+ sspa_sp |= SSPA_SP_FWID(31);
+ sspa_ctrl |= SSPA_CTL_XDATDLY(1);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
+ mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
+
+ sspa_sp &= ~(SSPA_SP_S_RST | SSPA_SP_FFLUSH);
+ mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
+ mmp_sspa_write_reg(sspa, SSPA_RXSP, sspa_sp);
+
+ /*
+ * FIXME: hw issue, for the tx serial port,
+ * can not config the master/slave mode;
+ * so must clean this bit.
+ * The master/slave mode has been set in the
+ * rx port.
+ */
+ sspa_sp &= ~SSPA_SP_MSL;
+ mmp_sspa_write_reg(sspa, SSPA_TXSP, sspa_sp);
+
+ mmp_sspa_write_reg(sspa, SSPA_TXCTL, sspa_ctrl);
+ mmp_sspa_write_reg(sspa, SSPA_RXCTL, sspa_ctrl);
+
+ /* Since we are configuring the timings for the format by hand
+ * we have to defer some things until hw_params() where we
+ * know parameters like the sample size.
+ */
+ sspa_priv->dai_fmt = fmt;
+ return 0;
+}
+
+/*
+ * Set the SSPA audio DMA parameters and sample size.
+ * Can be called multiple times by oss emulation.
+ */
+static int mmp_sspa_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+ struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(dai);
+ struct ssp_device *sspa = sspa_priv->sspa;
+ struct pxa2xx_pcm_dma_params *dma_params;
+ u32 sspa_ctrl;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ sspa_ctrl = mmp_sspa_read_reg(sspa, SSPA_TXCTL);
+ else
+ sspa_ctrl = mmp_sspa_read_reg(sspa, SSPA_RXCTL);
+
+ sspa_ctrl &= ~SSPA_CTL_XFRLEN1_MASK;
+ sspa_ctrl |= SSPA_CTL_XFRLEN1(params_channels(params) - 1);
+ sspa_ctrl &= ~SSPA_CTL_XWDLEN1_MASK;
+ sspa_ctrl |= SSPA_CTL_XWDLEN1(SSPA_CTL_32_BITS);
+ sspa_ctrl &= ~SSPA_CTL_XSSZ1_MASK;
+
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S8:
+ sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_8_BITS);
+ break;
+ case SNDRV_PCM_FORMAT_S16_LE:
+ sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_16_BITS);
+ break;
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_20_BITS);
+ break;
+ case SNDRV_PCM_FORMAT_S24_3LE:
+ sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_24_BITS);
+ break;
+ case SNDRV_PCM_FORMAT_S32_LE:
+ sspa_ctrl |= SSPA_CTL_XSSZ1(SSPA_CTL_32_BITS);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ mmp_sspa_write_reg(sspa, SSPA_TXCTL, sspa_ctrl);
+ mmp_sspa_write_reg(sspa, SSPA_TXFIFO_LL, 0x1);
+ } else {
+ mmp_sspa_write_reg(sspa, SSPA_RXCTL, sspa_ctrl);
+ mmp_sspa_write_reg(sspa, SSPA_RXFIFO_UL, 0x0);
+ }
+
+ dma_params = &sspa_priv->dma_params[substream->stream];
+ dma_params->dev_addr = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
+ (sspa->phys_base + SSPA_TXD) :
+ (sspa->phys_base + SSPA_RXD);
+ snd_soc_dai_set_dma_data(cpu_dai, substream, dma_params);
+ return 0;
+}
+
+static int mmp_sspa_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct sspa_priv *sspa_priv = snd_soc_dai_get_drvdata(dai);
+ struct ssp_device *sspa = sspa_priv->sspa;
+ int ret = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ /*
+ * whatever playback or capture, must enable rx.
+ * this is a hw issue, so need check if rx has been
+ * enabled or not; if has been enabled by another
+ * stream, do not enable again.
+ */
+ if (!sspa_priv->running_cnt)
+ mmp_sspa_rx_enable(sspa);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ mmp_sspa_tx_enable(sspa);
+
+ sspa_priv->running_cnt++;
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ sspa_priv->running_cnt--;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ mmp_sspa_tx_disable(sspa);
+
+ /* have no capture stream, disable rx port */
+ if (!sspa_priv->running_cnt)
+ mmp_sspa_rx_disable(sspa);
+ break;
+
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static int mmp_sspa_probe(struct snd_soc_dai *dai)
+{
+ struct sspa_priv *priv = dev_get_drvdata(dai->dev);
+
+ snd_soc_dai_set_drvdata(dai, priv);
+ return 0;
+
+}
+
+#define MMP_SSPA_RATES SNDRV_PCM_RATE_8000_192000
+#define MMP_SSPA_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
+ SNDRV_PCM_FMTBIT_S16_LE | \
+ SNDRV_PCM_FMTBIT_S24_LE | \
+ SNDRV_PCM_FMTBIT_S24_LE | \
+ SNDRV_PCM_FMTBIT_S32_LE)
+
+static struct snd_soc_dai_ops mmp_sspa_dai_ops = {
+ .startup = mmp_sspa_startup,
+ .shutdown = mmp_sspa_shutdown,
+ .trigger = mmp_sspa_trigger,
+ .hw_params = mmp_sspa_hw_params,
+ .set_sysclk = mmp_sspa_set_dai_sysclk,
+ .set_pll = mmp_sspa_set_dai_pll,
+ .set_fmt = mmp_sspa_set_dai_fmt,
+};
+
+struct snd_soc_dai_driver mmp_sspa_dai = {
+ .probe = mmp_sspa_probe,
+ .playback = {
+ .channels_min = 1,
+ .channels_max = 128,
+ .rates = MMP_SSPA_RATES,
+ .formats = MMP_SSPA_FORMATS,
+ },
+ .capture = {
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = MMP_SSPA_RATES,
+ .formats = MMP_SSPA_FORMATS,
+ },
+ .ops = &mmp_sspa_dai_ops,
+};
+
+static __devinit int asoc_mmp_sspa_probe(struct platform_device *pdev)
+{
+ struct sspa_priv *priv;
+ struct resource *res;
+
+ priv = devm_kzalloc(&pdev->dev,
+ sizeof(struct sspa_priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->sspa = devm_kzalloc(&pdev->dev,
+ sizeof(struct ssp_device), GFP_KERNEL);
+ if (priv->sspa == NULL)
+ return -ENOMEM;
+
+ priv->dma_params = devm_kzalloc(&pdev->dev,
+ 2 * sizeof(struct pxa2xx_pcm_dma_params), GFP_KERNEL);
+ if (priv->dma_params == NULL)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res == NULL)
+ return -ENOMEM;
+
+ priv->sspa->mmio_base = devm_request_and_ioremap(&pdev->dev, res);
+ if (priv->sspa->mmio_base == NULL)
+ return -ENODEV;
+
+ priv->sspa->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(priv->sspa->clk))
+ return PTR_ERR(priv->sspa->clk);
+
+ priv->audio_clk = clk_get(NULL, "mmp-audio");
+ if (IS_ERR(priv->audio_clk))
+ return PTR_ERR(priv->audio_clk);
+
+ priv->sysclk = clk_get(NULL, "mmp-sysclk");
+ if (IS_ERR(priv->sysclk)) {
+ clk_put(priv->audio_clk);
+ return PTR_ERR(priv->sysclk);
+ }
+ clk_enable(priv->audio_clk);
+ priv->dai_fmt = (unsigned int) -1;
+ platform_set_drvdata(pdev, priv);
+
+ return snd_soc_register_dai(&pdev->dev, &mmp_sspa_dai);
+}
+
+static int __devexit asoc_mmp_sspa_remove(struct platform_device *pdev)
+{
+ struct sspa_priv *priv = platform_get_drvdata(pdev);
+
+ clk_disable(priv->audio_clk);
+ clk_put(priv->audio_clk);
+ clk_put(priv->sysclk);
+ snd_soc_unregister_dai(&pdev->dev);
+ return 0;
+}
+
+static struct platform_driver asoc_mmp_sspa_driver = {
+ .driver = {
+ .name = "mmp-sspa-dai",
+ .owner = THIS_MODULE,
+ },
+ .probe = asoc_mmp_sspa_probe,
+ .remove = __devexit_p(asoc_mmp_sspa_remove),
+};
+
+module_platform_driver(asoc_mmp_sspa_driver);
+
+MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
+MODULE_DESCRIPTION("MMP SSPA SoC Interface");
+MODULE_LICENSE("GPL");