ASoC: OMAP4 - DMIC DAI driver
Add both legacy DMA and ABE support for Digital Microphones on the
OMAP4 platform.
Signed-off-by: Liam Girdwood <lrg@ti.com>
diff --git a/sound/soc/omap/Kconfig b/sound/soc/omap/Kconfig
index fb5d2a8..e28ca02 100644
--- a/sound/soc/omap/Kconfig
+++ b/sound/soc/omap/Kconfig
@@ -15,6 +15,9 @@
config SND_OMAP_SOC_ABE
tristate
+config SND_OMAP_SOC_DMIC
+ tristate
+
config SND_OMAP_SOC_N810
tristate "SoC Audio support for Nokia N810"
depends on SND_OMAP_SOC && MACH_NOKIA_N810 && I2C
diff --git a/sound/soc/omap/Makefile b/sound/soc/omap/Makefile
index 0d90f64..7cc549d 100644
--- a/sound/soc/omap/Makefile
+++ b/sound/soc/omap/Makefile
@@ -2,12 +2,14 @@
snd-soc-omap-objs := omap-pcm.o
snd-soc-omap-mcbsp-objs := omap-mcbsp.o
snd-soc-omap-mcpdm-objs := omap-mcpdm.o
+snd-soc-omap-dmic-objs := omap-dmic.o
snd-soc-omap-abe-objs := omap-abe.o
snd-soc-omap-abe-dsp-objs := omap-abe-dsp.o
obj-$(CONFIG_SND_OMAP_SOC) += snd-soc-omap.o
obj-$(CONFIG_SND_OMAP_SOC_MCBSP) += snd-soc-omap-mcbsp.o
obj-$(CONFIG_SND_OMAP_SOC_MCPDM) += snd-soc-omap-mcpdm.o
+obj-$(CONFIG_SND_OMAP_SOC_DMIC) += snd-soc-omap-dmic.o
obj-$(CONFIG_SND_OMAP_SOC_ABE) += snd-soc-omap-abe.o
obj-$(CONFIG_SND_OMAP_SOC_ABE_DSP) += snd-soc-omap-abe-dsp.o abe/
diff --git a/sound/soc/omap/omap-dmic.c b/sound/soc/omap/omap-dmic.c
new file mode 100644
index 0000000..5f8aa2d
--- /dev/null
+++ b/sound/soc/omap/omap-dmic.c
@@ -0,0 +1,623 @@
+/*
+ * omap-dmic.c -- OMAP ASoC DMIC DAI driver
+ *
+ * Copyright (C) 2010 Texas Instruments
+ *
+ * Author: Liam Girdwood <lrg@ti.com>
+ * David Lambert <dlambert@ti.com>
+ * Misael Lopez Cruz <misael.lopez@ti.com>
+ *
+ * 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.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#undef DEBUG
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+
+#include <plat/dma.h>
+#include <plat/dmic.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#include "omap-pcm.h"
+#include "omap-dmic.h"
+
+#define OMAP_DMIC_RATES (SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000)
+#define OMAP_DMIC_FORMATS SNDRV_PCM_FMTBIT_S32_LE
+
+#define OMAP4_LEGACY_DMIC0 0
+#define OMAP4_ABE_DMIC0 1
+#define OMAP4_ABE_DMIC1 2
+#define OMAP4_ABE_DMIC2 3
+
+struct omap_dmic {
+ struct device *dev;
+ void __iomem *io_base;
+ int clk_freq;
+ int sysclk;
+ int active;
+ int running;
+ int channels;
+ int abe_mode;
+ u32 up_enable;
+ struct mutex mutex;
+};
+
+/*
+ * Stream DMA parameters
+ */
+static struct omap_pcm_dma_data omap_dmic_dai_dma_params = {
+ .name = "DMIC capture",
+ .data_type = OMAP_DMA_DATA_TYPE_S32,
+ .sync_mode = OMAP_DMA_SYNC_PACKET,
+ .packet_size = 2,
+ .port_addr = OMAP44XX_DMIC_L3_BASE + OMAP_DMIC_DATA,
+};
+
+static inline void omap_dmic_write(struct omap_dmic *dmic, u16 reg, u32 val)
+{
+ __raw_writel(val, dmic->io_base + reg);
+}
+
+static inline int omap_dmic_read(struct omap_dmic *dmic, u16 reg)
+{
+ return __raw_readl(dmic->io_base + reg);
+}
+
+/*
+ * Enables and disables DMIC channels through the DMIC interface
+ */
+static inline void dmic_set_up_channels(struct omap_dmic *dmic)
+{
+ u32 ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL) & ~OMAP_DMIC_UP_ENABLE_MASK;
+ omap_dmic_write(dmic, OMAP_DMIC_CTRL, ctrl | dmic->up_enable);
+}
+
+static inline int dmic_is_enabled(struct omap_dmic *dmic)
+{
+ return omap_dmic_read(dmic, OMAP_DMIC_CTRL) & OMAP_DMIC_UP_ENABLE_MASK;
+}
+
+static int omap_dmic_set_clkdiv(struct snd_soc_dai *dai,
+ int div_id, int div)
+{
+ struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
+ int div_sel = -EINVAL;
+ u32 ctrl;
+
+ if (div_id != OMAP_DMIC_CLKDIV)
+ return -ENODEV;
+
+ switch (dmic->clk_freq) {
+ case 19200000:
+ switch (div) {
+ case 5:
+ div_sel = 0x1;
+ break;
+ case 8:
+ div_sel = 0x0;
+ break;
+ default:
+ dev_err(dai->dev, "invalid div_sel (%d) for 19200000Hz", div);
+ return -EINVAL;
+ }
+ break;
+ case 24000000:
+ switch (div) {
+ case 10:
+ div_sel = 0x2;
+ break;
+ default:
+ dev_err(dai->dev, "invalid div_sel (%d) for 24000000Hz", div);
+ return -EINVAL;
+ }
+ break;
+ case 24576000:
+ switch (div) {
+ case 8:
+ div_sel = 0x3;
+ break;
+ case 16:
+ div_sel = 0x4;
+ break;
+ default:
+ dev_err(dai->dev, "invalid div_sel (%d) for 24576000Hz", div);
+ return -EINVAL;
+ }
+ break;
+ case 12000000:
+ switch (div) {
+ case 5:
+ div_sel = 0x5;
+ break;
+ default:
+ dev_err(dai->dev, "invalid div_sel (%d) for 12000000Hz", div);
+ return -EINVAL;
+ }
+ break;
+ default:
+ dev_err(dai->dev, "invalid freq %d\n", dmic->clk_freq);
+ return -EINVAL;
+ }
+
+ if (div_sel < 0) {
+ dev_err(dai->dev, "divider not supported %d\n", div);
+ return -EINVAL;
+ }
+
+ ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL) & ~OMAP_DMIC_CLK_DIV_MASK;
+
+ omap_dmic_write(dmic, OMAP_DMIC_CTRL,
+ ctrl | (div_sel << OMAP_DMIC_CLK_DIV_SHIFT));
+
+ return 0;
+}
+
+/*
+ * Configures DMIC for audio recording.
+ * This function should be called before omap_dmic_start.
+ */
+static void omap_dmic_open(struct omap_dmic *dmic)
+{
+ u32 ctrl;
+
+ /* Configure uplink threshold */
+ omap_dmic_write(dmic, OMAP_DMIC_FIFO_CTRL, 2);
+
+ /* Set dmic out format */
+ ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL)
+ & ~(OMAP_DMIC_FORMAT | OMAP_DMIC_POLAR_MASK);
+ omap_dmic_write(dmic, OMAP_DMIC_CTRL,
+ ctrl | OMAP_DMICOUTFORMAT_LJUST |
+ OMAP_DMIC_POLAR1 | OMAP_DMIC_POLAR2 | OMAP_DMIC_POLAR3);
+}
+
+/*
+ * Cleans DMIC uplink configuration.
+ * This function should be called when the stream is closed.
+ */
+static void omap_dmic_close(struct omap_dmic *dmic)
+{
+ /* Disable DMA request generation */
+ omap_dmic_write(dmic, OMAP_DMIC_DMAENABLE_CLR, OMAP_DMIC_DMA_ENABLE);
+
+}
+
+static int omap_dmic_dai_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
+ int ret = 0;
+
+ mutex_lock(&dmic->mutex);
+
+ if (!dmic->active) {
+ pm_runtime_get_sync(dmic->dev);
+
+ if (dai->id > OMAP4_LEGACY_DMIC0)
+ dmic->abe_mode = 1;
+
+ omap_dmic_open(dmic);
+ } else {
+ /* legacy and ABE mode are mutually exclusive */
+ if (dai->id > OMAP4_LEGACY_DMIC0 && !dmic->abe_mode) {
+ ret = -EBUSY;
+ goto out;
+ }
+ }
+
+ dmic->active++;
+
+out:
+ mutex_unlock(&dmic->mutex);
+ return ret;
+}
+
+static void omap_dmic_dai_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
+
+ mutex_lock(&dmic->mutex);
+
+ if (--dmic->active == 0) {
+ omap_dmic_close(dmic);
+ pm_runtime_put_sync(dmic->dev);
+ dmic->abe_mode = 0;
+ }
+
+ mutex_unlock(&dmic->mutex);
+}
+
+static int omap_dmic_dai_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
+ int channels, rate, div;
+ int ret = 0;
+
+ channels = params_channels(params);
+ if (dai->id == OMAP4_LEGACY_DMIC0) {
+ switch (channels) {
+ case 2:
+ case 4:
+ case 6:
+ dmic->channels = channels;
+ break;
+ default:
+ dev_err(dmic->dev, "invalid number of legacy channels\n");
+ return -EINVAL;
+ }
+ } else {
+ if (channels != 2) {
+ dev_err(dmic->dev, "invalid number of ABE channels\n");
+ return -EINVAL;
+ }
+ }
+
+ rate = params_rate(params);
+ switch (rate) {
+ case 96000:
+ div = 8;
+ break;
+ case 192000:
+ div = 5;
+ break;
+ default:
+ dev_err(dmic->dev, "rate %d not supported\n", rate);
+ return -EINVAL;
+ }
+
+ /* packet size is threshold * channels */
+ omap_dmic_dai_dma_params.packet_size = 2 * channels;
+ snd_soc_dai_set_dma_data(dai, substream, &omap_dmic_dai_dma_params);
+
+ return ret;
+}
+
+static void dmic_config_up_channels(struct omap_dmic *dmic, int dai_id,
+ int enable)
+{
+ if (enable) {
+ switch (dai_id) {
+ case OMAP4_LEGACY_DMIC0:
+ switch (dmic->channels) {
+ case 6:
+ dmic->up_enable = OMAP_DMIC_UP1_ENABLE | OMAP_DMIC_UP2_ENABLE
+ | OMAP_DMIC_UP3_ENABLE;
+ break;
+ case 4:
+ dmic->up_enable = OMAP_DMIC_UP1_ENABLE | OMAP_DMIC_UP2_ENABLE;
+ break;
+ case 2:
+ dmic->up_enable = OMAP_DMIC_UP1_ENABLE;
+ break;
+ default:
+ break;
+ }
+ break;
+ case OMAP4_ABE_DMIC0:
+ case OMAP4_ABE_DMIC1:
+ case OMAP4_ABE_DMIC2:
+ /*
+ * ABE expects all the DMIC interfaces to be
+ * enabled, so enabling them when at least one
+ * DMIC DAI is running
+ */
+ if (dmic->running)
+ dmic->up_enable |= OMAP_DMIC_UP1_ENABLE |
+ OMAP_DMIC_UP2_ENABLE |
+ OMAP_DMIC_UP3_ENABLE;
+ break;
+ default:
+ break;
+ }
+ } else {
+ switch (dai_id) {
+ case OMAP4_LEGACY_DMIC0:
+ dmic->up_enable = 0;
+ break;
+ case OMAP4_ABE_DMIC0:
+ case OMAP4_ABE_DMIC1:
+ case OMAP4_ABE_DMIC2:
+ /*
+ * Disable all DMIC interfaces only when
+ * all DAIs are stopped
+ */
+ if (!dmic->running)
+ dmic->up_enable = 0;
+ break;
+ default:
+ break;
+ }
+ }
+}
+
+static int omap_dmic_dai_prepare(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
+
+ /* Configure DMA controller */
+ omap_dmic_write(dmic, OMAP_DMIC_DMAENABLE_SET, OMAP_DMIC_DMA_ENABLE);
+
+ return 0;
+}
+
+static int omap_dmic_dai_trigger(struct snd_pcm_substream *substream,
+ int cmd, struct snd_soc_dai *dai)
+{
+ struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ dmic->running++;
+ dmic_config_up_channels(dmic, dai->id, 1);
+ dmic_set_up_channels(dmic);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ dmic->running--;
+ dmic_config_up_channels(dmic, dai->id, 0);
+ dmic_set_up_channels(dmic);
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int omap_dmic_set_dai_sysclk(struct snd_soc_dai *dai,
+ int clk_id, unsigned int freq,
+ int dir)
+{
+ struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
+ struct clk *dmic_clk, *parent_clk;
+ int ret = 0;
+
+ dmic_clk = clk_get(NULL, "dmic_fck");
+ if (IS_ERR(dmic_clk)) {
+ dev_err(dmic->dev, "cant get dmic_fck\n");
+ return -ENODEV;
+ }
+
+ switch (clk_id) {
+ case OMAP_DMIC_SYSCLK_PAD_CLKS:
+ parent_clk = clk_get(NULL, "pad_clks_ck");
+ if (IS_ERR(parent_clk)) {
+ dev_err(dmic->dev, "cant get pad_clks_ck\n");
+ ret = -ENODEV;
+ goto err_par;
+ }
+ break;
+ case OMAP_DMIC_SYSCLK_SLIMBLUS_CLKS:
+ parent_clk = clk_get(NULL, "slimbus_clk");
+ if (IS_ERR(parent_clk)) {
+ dev_err(dmic->dev, "cant get slimbus_clk\n");
+ ret = -ENODEV;
+ goto err_par;
+ }
+ break;
+ case OMAP_DMIC_SYSCLK_SYNC_MUX_CLKS:
+ parent_clk = clk_get(NULL, "dmic_sync_mux_ck");
+ if (IS_ERR(parent_clk)) {
+ dev_err(dmic->dev, "cant get dmic_sync_mux_ck\n");
+ ret = -ENODEV;
+ goto err_par;
+ }
+ break;
+ default:
+ dev_err(dai->dev, "clk_id not supported %d\n", clk_id);
+ ret = -EINVAL;
+ goto err_par;
+ }
+
+ if (dmic->sysclk != clk_id) {
+ /* re-parent not allowed if a stream is ongoing */
+ if (dmic_is_enabled(dmic)) {
+ dev_err(dmic->dev, "cant re-parent when DMIC active\n");
+ ret = -EBUSY;
+ goto err_busy;
+ }
+
+ /* disable clock while reparenting */
+ pm_runtime_put_sync(dmic->dev);
+ ret = clk_set_parent(dmic_clk, parent_clk);
+ pm_runtime_get_sync(dmic->dev);
+ if (ret < 0) {
+ dev_err(dmic->dev, "re-parent failed\n");
+ goto err_busy;
+ }
+
+ dmic->sysclk = clk_id;
+
+ //ret = clk_set_rate(dmic_clk, freq);
+ if (ret < 0)
+ dev_err(dmic->dev, "clock set to %d Hz failed\n", freq);
+ else
+ dmic->clk_freq = freq;
+ }
+
+err_busy:
+ clk_put(parent_clk);
+err_par:
+ clk_put(dmic_clk);
+
+ return ret;
+}
+
+static struct snd_soc_dai_ops omap_dmic_dai_ops = {
+ .startup = omap_dmic_dai_startup,
+ .shutdown = omap_dmic_dai_shutdown,
+ .hw_params = omap_dmic_dai_hw_params,
+ .prepare = omap_dmic_dai_prepare,
+ .trigger = omap_dmic_dai_trigger,
+ .set_sysclk = omap_dmic_set_dai_sysclk,
+ .set_clkdiv = omap_dmic_set_clkdiv,
+};
+
+static struct snd_soc_dai_driver omap_dmic_dai[] = {
+{
+ .name = "omap-dmic-dai-0",
+ .id = OMAP4_LEGACY_DMIC0,
+ .capture = {
+ .channels_min = 2,
+ .channels_max = 6,
+ .rates = OMAP_DMIC_RATES,
+ .formats = OMAP_DMIC_FORMATS,
+ },
+ .ops = &omap_dmic_dai_ops,
+},
+{
+ .name = "omap-dmic-abe-dai-0",
+ .id = OMAP4_ABE_DMIC0,
+ .capture = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = OMAP_DMIC_RATES,
+ .formats = OMAP_DMIC_FORMATS,
+ },
+ .ops = &omap_dmic_dai_ops,
+},
+{
+ .name = "omap-dmic-abe-dai-1",
+ .id = OMAP4_ABE_DMIC1,
+ .capture = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = OMAP_DMIC_RATES,
+ .formats = OMAP_DMIC_FORMATS,
+ },
+ .ops = &omap_dmic_dai_ops,
+},
+{
+ .name = "omap-dmic-abe-dai-2",
+ .id = OMAP4_ABE_DMIC2,
+ .capture = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = OMAP_DMIC_RATES,
+ .formats = OMAP_DMIC_FORMATS,
+ },
+ .ops = &omap_dmic_dai_ops,
+},
+};
+
+static __devinit int asoc_dmic_probe(struct platform_device *pdev)
+{
+ struct omap_dmic *dmic;
+ struct resource *res;
+ int ret;
+
+ dmic = kzalloc(sizeof(struct omap_dmic), GFP_KERNEL);
+ if (!dmic)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, dmic);
+ dmic->dev = &pdev->dev;
+ dmic->sysclk = OMAP_DMIC_SYSCLK_SYNC_MUX_CLKS;
+
+ mutex_init(&dmic->mutex);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dmic->dev, "invalid memory resource\n");
+ ret = -ENODEV;
+ goto err_res;
+ }
+
+ dmic->io_base = ioremap(res->start, resource_size(res));
+ if (!dmic->io_base) {
+ ret = -ENOMEM;
+ goto err_res;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ if (!res) {
+ dev_err(dmic->dev, "invalid dma resource\n");
+ ret = -ENODEV;
+ goto err_dai;
+ }
+ omap_dmic_dai_dma_params.dma_req = res->start;
+
+ pm_runtime_enable(dmic->dev);
+
+ /* Disable lines while request is ongoing */
+ omap_dmic_write(dmic, OMAP_DMIC_CTRL, 0x00);
+
+ ret = snd_soc_register_dais(&pdev->dev, omap_dmic_dai,
+ ARRAY_SIZE(omap_dmic_dai));
+ if (ret)
+ goto err_dai;
+
+ return 0;
+
+err_dai:
+ iounmap(dmic->io_base);
+err_res:
+ kfree(dmic);
+ return ret;
+}
+
+static int __devexit asoc_dmic_remove(struct platform_device *pdev)
+{
+ struct omap_dmic *dmic = platform_get_drvdata(pdev);
+
+ snd_soc_unregister_dais(&pdev->dev, ARRAY_SIZE(omap_dmic_dai));
+ iounmap(dmic->io_base);
+ pm_runtime_disable(dmic->dev);
+ kfree(dmic);
+
+ return 0;
+}
+
+static struct platform_driver asoc_dmic_driver = {
+ .driver = {
+ .name = "omap-dmic-dai",
+ .owner = THIS_MODULE,
+ },
+ .probe = asoc_dmic_probe,
+ .remove = __devexit_p(asoc_dmic_remove),
+};
+
+static int __init snd_omap_dmic_init(void)
+{
+ return platform_driver_register(&asoc_dmic_driver);
+}
+module_init(snd_omap_dmic_init);
+
+static void __exit snd_omap_dmic_exit(void)
+{
+ platform_driver_unregister(&asoc_dmic_driver);
+}
+module_exit(snd_omap_dmic_exit);
+
+MODULE_ALIAS("platform:omap-dmic-dai");
+MODULE_AUTHOR("David Lambert <dlambert@ti.com>");
+MODULE_DESCRIPTION("OMAP DMIC ASoC Interface");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/omap/omap-dmic.h b/sound/soc/omap/omap-dmic.h
new file mode 100644
index 0000000..728fed2
--- /dev/null
+++ b/sound/soc/omap/omap-dmic.h
@@ -0,0 +1,23 @@
+/*
+ * omap-dmic.h -- OMAP Digital Microphone Controller
+ *
+ * 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.
+ */
+
+#ifndef _OMAP_DMIC_H
+#define _OMAP_DMIC_H
+
+enum omap_dmic_clk {
+ OMAP_DMIC_SYSCLK_PAD_CLKS, /* PAD_CLKS */
+ OMAP_DMIC_SYSCLK_SLIMBLUS_CLKS, /* SLIMBUS_CLK */
+ OMAP_DMIC_SYSCLK_SYNC_MUX_CLKS, /* DMIC_SYNC_MUX_CLK */
+};
+
+/* DMIC dividers */
+enum omap_dmic_div {
+ OMAP_DMIC_CLKDIV,
+};
+
+#endif