[alsa-devel] [PATCH 2/5] ASoC: OMAP4: omap-dmic: Initial support for OMAP DMIC
Peter Ujfalusi
peter.ujfalusi at ti.com
Tue Nov 22 15:01:57 CET 2011
Add support for OMAP4 Digital Microphone interface.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi at ti.com>
---
sound/soc/omap/Kconfig | 3 +
sound/soc/omap/Makefile | 2 +
sound/soc/omap/omap-dmic.c | 494 ++++++++++++++++++++++++++++++++++++++++++++
sound/soc/omap/omap-dmic.h | 73 +++++++
4 files changed, 572 insertions(+), 0 deletions(-)
create mode 100644 sound/soc/omap/omap-dmic.c
create mode 100644 sound/soc/omap/omap-dmic.h
diff --git a/sound/soc/omap/Kconfig b/sound/soc/omap/Kconfig
index fe83d0d..052254a 100644
--- a/sound/soc/omap/Kconfig
+++ b/sound/soc/omap/Kconfig
@@ -2,6 +2,9 @@ config SND_OMAP_SOC
tristate "SoC Audio for the Texas Instruments OMAP chips"
depends on ARCH_OMAP
+config SND_OMAP_SOC_DMIC
+ tristate
+
config SND_OMAP_SOC_MCBSP
tristate
select OMAP_MCBSP
diff --git a/sound/soc/omap/Makefile b/sound/soc/omap/Makefile
index 052fd75..1fd723f 100644
--- a/sound/soc/omap/Makefile
+++ b/sound/soc/omap/Makefile
@@ -1,10 +1,12 @@
# OMAP Platform Support
snd-soc-omap-objs := omap-pcm.o
+snd-soc-omap-dmic-objs := omap-dmic.o
snd-soc-omap-mcbsp-objs := omap-mcbsp.o
snd-soc-omap-mcpdm-objs := omap-mcpdm.o
snd-soc-omap-hdmi-objs := omap-hdmi.o
obj-$(CONFIG_SND_OMAP_SOC) += snd-soc-omap.o
+obj-$(CONFIG_SND_OMAP_SOC_DMIC) += snd-soc-omap-dmic.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_HDMI) += snd-soc-omap-hdmi.o
diff --git a/sound/soc/omap/omap-dmic.c b/sound/soc/omap/omap-dmic.c
new file mode 100644
index 0000000..5c7e6ca
--- /dev/null
+++ b/sound/soc/omap/omap-dmic.c
@@ -0,0 +1,494 @@
+/*
+ * omap-dmic.c -- OMAP ASoC DMIC DAI driver
+ *
+ * Copyright (C) 2010 - 2011 Texas Instruments
+ *
+ * Author: David Lambert <dlambert at ti.com>
+ * Misael Lopez Cruz <misael.lopez at ti.com>
+ * Liam Girdwood <lrg at ti.com>
+ * Peter Ujfalusi <peter.ujfalusi at 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
+ *
+ */
+
+#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 <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
+
+struct omap_dmic {
+ struct device *dev;
+ void __iomem *io_base;
+ int clk_freq;
+ int sysclk;
+ int threshold;
+ int abe_mode;
+ u32 ch_enabled;
+ 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,
+};
+
+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);
+}
+
+static inline void omap_dmic_start(struct omap_dmic *dmic)
+{
+ u32 ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);
+
+ /* Configure DMA controller */
+ omap_dmic_write(dmic, OMAP_DMIC_DMAENABLE_SET_REG,
+ OMAP_DMIC_DMA_ENABLE);
+
+ omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, ctrl | dmic->ch_enabled);
+}
+
+static inline void omap_dmic_stop(struct omap_dmic *dmic)
+{
+ u32 ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);
+ omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG,
+ ctrl & ~OMAP_DMIC_UP_ENABLE_MASK);
+
+ /* Disable DMA request generation */
+ omap_dmic_write(dmic, OMAP_DMIC_DMAENABLE_CLR_REG,
+ OMAP_DMIC_DMA_ENABLE);
+
+}
+
+static inline int dmic_is_enabled(struct omap_dmic *dmic)
+{
+ return omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG) &
+ OMAP_DMIC_UP_ENABLE_MASK;
+}
+
+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 (!dai->active)
+ pm_runtime_get_sync(dmic->dev);
+ else
+ ret = -EBUSY;
+
+ 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 (!dai->active)
+ pm_runtime_put_sync(dmic->dev);
+
+ 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;
+
+ dmic->ch_enabled = 0;
+ channels = params_channels(params);
+ switch (channels) {
+ case 6:
+ dmic->ch_enabled |= OMAP_DMIC_UP3_ENABLE;
+ case 4:
+ dmic->ch_enabled |= OMAP_DMIC_UP2_ENABLE;
+ case 2:
+ dmic->ch_enabled |= OMAP_DMIC_UP1_ENABLE;
+ break;
+ default:
+ dev_err(dmic->dev, "invalid number of legacy channels\n");
+ return -EINVAL;
+ }
+
+ switch (params_rate(params)) {
+ case 96000:
+ case 192000:
+ break;
+ default:
+ dev_err(dmic->dev, "rate %d not supported\n",
+ params_rate(params));
+ return -EINVAL;
+ }
+
+ /* packet size is threshold * channels */
+ omap_dmic_dai_dma_params.packet_size = dmic->threshold * channels;
+ snd_soc_dai_set_dma_data(dai, substream, &omap_dmic_dai_dma_params);
+
+ return 0;
+}
+
+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);
+ u32 ctrl;
+
+ /* Configure uplink threshold */
+ omap_dmic_write(dmic, OMAP_DMIC_FIFO_CTRL_REG, dmic->threshold);
+
+ /* Set dmic out format */
+ ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG)
+ & ~(OMAP_DMIC_FORMAT | OMAP_DMIC_POLAR_MASK);
+ omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG,
+ ctrl | OMAP_DMICOUTFORMAT_LJUST |
+ OMAP_DMIC_POLAR1 | OMAP_DMIC_POLAR2 | OMAP_DMIC_POLAR3);
+
+ 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:
+ omap_dmic_start(dmic);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ omap_dmic_stop(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;
+ char *parent_clk_name;
+ int ret = 0;
+
+ if (dmic->sysclk == clk_id) {
+ dmic->clk_freq = freq;
+ return 0;
+ }
+
+ /* re-parent not allowed if a stream is ongoing */
+ if (dmic_is_enabled(dmic)) {
+ dev_err(dmic->dev, "can't re-parent when DMIC active\n");
+ return -EBUSY;
+ }
+
+ dmic_clk = clk_get(dmic->dev, "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_name = "pad_clks_ck";
+ break;
+ case OMAP_DMIC_SYSCLK_SLIMBLUS_CLKS:
+ parent_clk_name = "slimbus_clk";
+ break;
+ case OMAP_DMIC_SYSCLK_SYNC_MUX_CLKS:
+ parent_clk_name = "dmic_sync_mux_ck";
+ break;
+ default:
+ dev_err(dai->dev, "clk_id not supported %d\n", clk_id);
+ ret = -EINVAL;
+ goto err_par;
+ }
+
+ parent_clk = clk_get(dmic->dev, parent_clk_name);
+ if (IS_ERR(parent_clk)) {
+ dev_err(dmic->dev, "can't get %s\n", parent_clk_name);
+ ret = -ENODEV;
+ goto err_par;
+ }
+
+ /* 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;
+ dmic->clk_freq = freq;
+
+err_busy:
+ clk_put(parent_clk);
+err_par:
+ clk_put(dmic_clk);
+
+ return ret;
+}
+
+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;
+ 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:
+ goto div_err;
+ }
+ break;
+ case 24000000:
+ switch (div) {
+ case 10:
+ div_sel = 0x2;
+ break;
+ default:
+ goto div_err;
+ }
+ break;
+ case 24576000:
+ switch (div) {
+ case 8:
+ div_sel = 0x3;
+ break;
+ case 16:
+ div_sel = 0x4;
+ break;
+ default:
+ goto div_err;
+ }
+ break;
+ case 12000000:
+ switch (div) {
+ case 5:
+ div_sel = 0x5;
+ break;
+ default:
+ goto div_err;
+ }
+ break;
+ default:
+ dev_err(dai->dev, "invalid freq %d\n", dmic->clk_freq);
+ return -EINVAL;
+ }
+
+ ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);
+ ctrl &= ~OMAP_DMIC_CLK_DIV_MASK;
+ omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG,
+ ctrl | OMAP_DMIC_CLK_DIV(div_sel));
+
+ return 0;
+div_err:
+ dev_err(dai->dev, "invalid divider (%d) for %dHz", div, dmic->clk_freq);
+ return -EINVAL;
+}
+
+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 int omap_dmic_probe(struct snd_soc_dai *dai)
+{
+ struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
+
+ pm_runtime_enable(dmic->dev);
+
+ /* Disable lines while request is ongoing */
+ pm_runtime_get_sync(dmic->dev);
+ omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, 0x00);
+ pm_runtime_put_sync(dmic->dev);
+
+ /* Configure DMIC threshold value */
+ dmic->threshold = OMAP_DMIC_THRES_MAX - 3;
+ return 0;
+}
+
+static int omap_dmic_remove(struct snd_soc_dai *dai)
+{
+ struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
+
+ pm_runtime_disable(dmic->dev);
+
+ return 0;
+}
+
+static struct snd_soc_dai_driver omap_dmic_dai = {
+ .name = "omap-dmic",
+ .probe = omap_dmic_probe,
+ .remove = omap_dmic_remove,
+ .capture = {
+ .channels_min = 2,
+ .channels_max = 6,
+ .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_byname(pdev, IORESOURCE_MEM, "dma");
+ if (!res) {
+ dev_err(dmic->dev, "invalid dma memory resource\n");
+ ret = -ENODEV;
+ goto err_res;
+ }
+ omap_dmic_dai_dma_params.port_addr = res->start + OMAP_DMIC_DATA_REG;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
+ 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;
+
+ ret = snd_soc_register_dai(&pdev->dev, &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_dai(&pdev->dev);
+ iounmap(dmic->io_base);
+ kfree(dmic);
+
+ return 0;
+}
+
+static struct platform_driver asoc_dmic_driver = {
+ .driver = {
+ .name = "omap-dmic",
+ .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");
+MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi at 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..3f964d8
--- /dev/null
+++ b/sound/soc/omap/omap-dmic.h
@@ -0,0 +1,73 @@
+/*
+ * 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
+
+#define OMAP_DMIC_REVISION_REG 0x00
+#define OMAP_DMIC_SYSCONFIG_REG 0x10
+#define OMAP_DMIC_IRQSTATUS_RAW_REG 0x24
+#define OMAP_DMIC_IRQSTATUS_REG 0x28
+#define OMAP_DMIC_IRQENABLE_SET_REG 0x2C
+#define OMAP_DMIC_IRQENABLE_CLR_REG 0x30
+#define OMAP_DMIC_IRQWAKE_EN_REG 0x34
+#define OMAP_DMIC_DMAENABLE_SET_REG 0x38
+#define OMAP_DMIC_DMAENABLE_CLR_REG 0x3C
+#define OMAP_DMIC_DMAWAKEEN_REG 0x40
+#define OMAP_DMIC_CTRL_REG 0x44
+#define OMAP_DMIC_DATA_REG 0x48
+#define OMAP_DMIC_FIFO_CTRL_REG 0x4C
+#define OMAP_DMIC_FIFO_DMIC1R_DATA_REG 0x50
+#define OMAP_DMIC_FIFO_DMIC1L_DATA_REG 0x54
+#define OMAP_DMIC_FIFO_DMIC2R_DATA_REG 0x58
+#define OMAP_DMIC_FIFO_DMIC2L_DATA_REG 0x5C
+#define OMAP_DMIC_FIFO_DMIC3R_DATA_REG 0x60
+#define OMAP_DMIC_FIFO_DMIC3L_DATA_REG 0x64
+
+/* IRQSTATUS_RAW, IRQSTATUS, IRQENABLE_SET, IRQENABLE_CLR bit fields */
+#define OMAP_DMIC_IRQ (1 << 0)
+#define OMAP_DMIC_IRQ_FULL (1 << 1)
+#define OMAP_DMIC_IRQ_ALMST_EMPTY (1 << 2)
+#define OMAP_DMIC_IRQ_EMPTY (1 << 3)
+#define OMAP_DMIC_IRQ_MASK 0x07
+
+/* DMIC_DMAENABLE bit fields */
+#define OMAP_DMIC_DMA_ENABLE 0x1
+
+/* DMIC_CTRL bit fields */
+#define OMAP_DMIC_UP1_ENABLE (1 << 0)
+#define OMAP_DMIC_UP2_ENABLE (1 << 1)
+#define OMAP_DMIC_UP3_ENABLE (1 << 2)
+#define OMAP_DMIC_UP_ENABLE_MASK 0x7
+#define OMAP_DMIC_FORMAT (1 << 3)
+#define OMAP_DMIC_POLAR1 (1 << 4)
+#define OMAP_DMIC_POLAR2 (1 << 5)
+#define OMAP_DMIC_POLAR3 (1 << 6)
+#define OMAP_DMIC_POLAR_MASK (0x7 << 4)
+#define OMAP_DMIC_CLK_DIV(x) (((x) & 0x7) << 7)
+#define OMAP_DMIC_CLK_DIV_MASK (0x7 << 7)
+#define OMAP_DMIC_RESET (1 << 10)
+
+#define OMAP_DMICOUTFORMAT_LJUST (0 << 3)
+#define OMAP_DMICOUTFORMAT_RJUST (1 << 3)
+
+/* DMIC_FIFO_CTRL bit fields */
+#define OMAP_DMIC_THRES_MAX 0xF
+
+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
--
1.7.8.rc3
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