ASoC: OMAP4: omap-dmic: Initial support for OMAP DMIC
Add support for OMAP4 Digital Microphone interface.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/omap/omap-dmic.c b/sound/soc/omap/omap-dmic.c
new file mode 100644
index 0000000..9c73c0c
--- /dev/null
+++ b/sound/soc/omap/omap-dmic.c
@@ -0,0 +1,549 @@
+/*
+ * omap-dmic.c -- OMAP ASoC DMIC DAI driver
+ *
+ * Copyright (C) 2010 - 2011 Texas Instruments
+ *
+ * Author: David Lambert <dlambert@ti.com>
+ * Misael Lopez Cruz <misael.lopez@ti.com>
+ * Liam Girdwood <lrg@ti.com>
+ * Peter Ujfalusi <peter.ujfalusi@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"
+
+struct omap_dmic {
+ struct device *dev;
+ void __iomem *io_base;
+ struct clk *fclk;
+ int fclk_freq;
+ int out_freq;
+ int clk_div;
+ int sysclk;
+ int threshold;
+ u32 ch_enabled;
+ bool active;
+ 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);
+ snd_pcm_hw_constraint_msbits(substream->runtime, 0, 32, 24);
+ dmic->active = 1;
+ } 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);
+ dmic->active = 0;
+ }
+
+ mutex_unlock(&dmic->mutex);
+}
+
+static int omap_dmic_select_divider(struct omap_dmic *dmic, int sample_rate)
+{
+ int divider = -EINVAL;
+
+ /*
+ * 192KHz rate is only supported with 19.2MHz/3.84MHz clock
+ * configuration.
+ */
+ if (sample_rate == 192000) {
+ if (dmic->fclk_freq == 19200000 && dmic->out_freq == 3840000)
+ divider = 0x6; /* Divider: 5 (192KHz sampling rate) */
+ else
+ dev_err(dmic->dev,
+ "invalid clock configuration for 192KHz\n");
+
+ return divider;
+ }
+
+ switch (dmic->out_freq) {
+ case 1536000:
+ if (dmic->fclk_freq != 24576000)
+ goto div_err;
+ divider = 0x4; /* Divider: 16 */
+ break;
+ case 2400000:
+ switch (dmic->fclk_freq) {
+ case 12000000:
+ divider = 0x5; /* Divider: 5 */
+ break;
+ case 19200000:
+ divider = 0x0; /* Divider: 8 */
+ break;
+ case 24000000:
+ divider = 0x2; /* Divider: 10 */
+ break;
+ default:
+ goto div_err;
+ }
+ break;
+ case 3072000:
+ if (dmic->fclk_freq != 24576000)
+ goto div_err;
+ divider = 0x3; /* Divider: 8 */
+ break;
+ case 3840000:
+ if (dmic->fclk_freq != 19200000)
+ goto div_err;
+ divider = 0x1; /* Divider: 5 (96KHz sampling rate) */
+ break;
+ default:
+ dev_err(dmic->dev, "invalid out frequency: %dHz\n",
+ dmic->out_freq);
+ break;
+ }
+
+ return divider;
+
+div_err:
+ dev_err(dmic->dev, "invalid out frequency %dHz for %dHz input\n",
+ dmic->out_freq, dmic->fclk_freq);
+ return -EINVAL;
+}
+
+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->clk_div = omap_dmic_select_divider(dmic, params_rate(params));
+ if (dmic->clk_div < 0) {
+ dev_err(dmic->dev, "no valid divider for %dHz from %dHz\n",
+ dmic->out_freq, dmic->fclk_freq);
+ return -EINVAL;
+ }
+
+ 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;
+ }
+
+ /* 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);
+
+ ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);
+
+ /* Set dmic out format */
+ ctrl &= ~(OMAP_DMIC_FORMAT | OMAP_DMIC_POLAR_MASK);
+ ctrl |= (OMAP_DMICOUTFORMAT_LJUST | OMAP_DMIC_POLAR1 |
+ OMAP_DMIC_POLAR2 | OMAP_DMIC_POLAR3);
+
+ /* Configure dmic clock divider */
+ ctrl &= ~OMAP_DMIC_CLK_DIV_MASK;
+ ctrl |= OMAP_DMIC_CLK_DIV(dmic->clk_div);
+
+ omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, ctrl);
+
+ 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_select_fclk(struct omap_dmic *dmic, int clk_id,
+ unsigned int freq)
+{
+ struct clk *parent_clk;
+ char *parent_clk_name;
+ int ret = 0;
+
+ switch (freq) {
+ case 12000000:
+ case 19200000:
+ case 24000000:
+ case 24576000:
+ break;
+ default:
+ dev_err(dmic->dev, "invalid input frequency: %dHz\n", freq);
+ dmic->fclk_freq = 0;
+ return -EINVAL;
+ }
+
+ if (dmic->sysclk == clk_id) {
+ dmic->fclk_freq = freq;
+ return 0;
+ }
+
+ /* re-parent not allowed if a stream is ongoing */
+ if (dmic->active && dmic_is_enabled(dmic)) {
+ dev_err(dmic->dev, "can't re-parent when DMIC active\n");
+ return -EBUSY;
+ }
+
+ 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(dmic->dev, "fclk clk_id (%d) not supported\n", clk_id);
+ return -EINVAL;
+ }
+
+ 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);
+ return -ENODEV;
+ }
+
+ mutex_lock(&dmic->mutex);
+ if (dmic->active) {
+ /* disable clock while reparenting */
+ pm_runtime_put_sync(dmic->dev);
+ ret = clk_set_parent(dmic->fclk, parent_clk);
+ pm_runtime_get_sync(dmic->dev);
+ } else {
+ ret = clk_set_parent(dmic->fclk, parent_clk);
+ }
+ mutex_unlock(&dmic->mutex);
+
+ if (ret < 0) {
+ dev_err(dmic->dev, "re-parent failed\n");
+ goto err_busy;
+ }
+
+ dmic->sysclk = clk_id;
+ dmic->fclk_freq = freq;
+
+err_busy:
+ clk_put(parent_clk);
+
+ return ret;
+}
+
+static int omap_dmic_select_outclk(struct omap_dmic *dmic, int clk_id,
+ unsigned int freq)
+{
+ int ret = 0;
+
+ if (clk_id != OMAP_DMIC_ABE_DMIC_CLK) {
+ dev_err(dmic->dev, "output clk_id (%d) not supported\n",
+ clk_id);
+ return -EINVAL;
+ }
+
+ switch (freq) {
+ case 1536000:
+ case 2400000:
+ case 3072000:
+ case 3840000:
+ dmic->out_freq = freq;
+ break;
+ default:
+ dev_err(dmic->dev, "invalid out frequency: %dHz\n", freq);
+ dmic->out_freq = 0;
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+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);
+
+ if (dir == SND_SOC_CLOCK_IN)
+ return omap_dmic_select_fclk(dmic, clk_id, freq);
+ else if (dir == SND_SOC_CLOCK_OUT)
+ return omap_dmic_select_outclk(dmic, clk_id, freq);
+
+ dev_err(dmic->dev, "invalid clock direction (%d)\n", dir);
+ return -EINVAL;
+}
+
+static const 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,
+};
+
+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 = SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000,
+ .formats = SNDRV_PCM_FMTBIT_S32_LE,
+ },
+ .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 = devm_kzalloc(&pdev->dev, 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);
+
+ dmic->fclk = clk_get(dmic->dev, "dmic_fck");
+ if (IS_ERR(dmic->fclk)) {
+ dev_err(dmic->dev, "cant get dmic_fck\n");
+ return -ENODEV;
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
+ if (!res) {
+ dev_err(dmic->dev, "invalid dma memory resource\n");
+ ret = -ENODEV;
+ goto err_put_clk;
+ }
+ omap_dmic_dai_dma_params.port_addr = res->start + OMAP_DMIC_DATA_REG;
+
+ res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ if (!res) {
+ dev_err(dmic->dev, "invalid dma resource\n");
+ ret = -ENODEV;
+ goto err_put_clk;
+ }
+ omap_dmic_dai_dma_params.dma_req = res->start;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
+ if (!res) {
+ dev_err(dmic->dev, "invalid memory resource\n");
+ ret = -ENODEV;
+ goto err_put_clk;
+ }
+
+ if (!devm_request_mem_region(&pdev->dev, res->start,
+ resource_size(res), pdev->name)) {
+ dev_err(dmic->dev, "memory region already claimed\n");
+ ret = -ENODEV;
+ goto err_put_clk;
+ }
+
+ dmic->io_base = devm_ioremap(&pdev->dev, res->start,
+ resource_size(res));
+ if (!dmic->io_base) {
+ ret = -ENOMEM;
+ goto err_put_clk;
+ }
+
+ ret = snd_soc_register_dai(&pdev->dev, &omap_dmic_dai);
+ if (ret)
+ goto err_put_clk;
+
+ return 0;
+
+err_put_clk:
+ clk_put(dmic->fclk);
+ 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);
+ clk_put(dmic->fclk);
+
+ 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),
+};
+
+module_platform_driver(asoc_dmic_driver);
+
+MODULE_ALIAS("platform:omap-dmic");
+MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
+MODULE_DESCRIPTION("OMAP DMIC ASoC Interface");
+MODULE_LICENSE("GPL");