ASoC: sst v2: Add mid platform driver

This patch adds the platform driver for mid asoc drivers.  This platfrom
driver sends commands to sst dsp engine driver for the dai operations.
For this purpose it depends on intel_sst driver which is currently in
staging tree
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Harsha Priya <priya.harsha@intel.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/mid-x86/sst_platform.c

+/*
+ *  sst_platform.c - Intel MID Platform driver
+ *
+ *  Copyright (C) 2010 Intel Corp
+ *  Author: Vinod Koul <vinod.koul@intel.com>
+ *  Author: Harsha Priya <priya.harsha@intel.com>
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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; version 2 of the License.
+ *
+ *  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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include "../../../drivers/staging/intel_sst/intel_sst_ioctl.h"
+#include "../../../drivers/staging/intel_sst/intel_sst.h"
+#include "sst_platform.h"
+
+static struct snd_pcm_hardware sst_platform_pcm_hw = {
+	.info =	(SNDRV_PCM_INFO_INTERLEAVED |
+			SNDRV_PCM_INFO_DOUBLE |
+			SNDRV_PCM_INFO_PAUSE |
+			SNDRV_PCM_INFO_RESUME |
+			SNDRV_PCM_INFO_MMAP|
+			SNDRV_PCM_INFO_MMAP_VALID |
+			SNDRV_PCM_INFO_BLOCK_TRANSFER |
+			SNDRV_PCM_INFO_SYNC_START),
+	.formats = (SNDRV_PCM_FMTBIT_S16 | SNDRV_PCM_FMTBIT_U16 |
+			SNDRV_PCM_FMTBIT_S24 | SNDRV_PCM_FMTBIT_U24 |
+			SNDRV_PCM_FMTBIT_S32 | SNDRV_PCM_FMTBIT_U32),
+	.rates = (SNDRV_PCM_RATE_8000|
+			SNDRV_PCM_RATE_44100 |
+			SNDRV_PCM_RATE_48000),
+	.rate_min = SST_MIN_RATE,
+	.rate_max = SST_MAX_RATE,
+	.channels_min =	SST_MIN_CHANNEL,
+	.channels_max =	SST_MAX_CHANNEL,
+	.buffer_bytes_max = SST_MAX_BUFFER,
+	.period_bytes_min = SST_MIN_PERIOD_BYTES,
+	.period_bytes_max = SST_MAX_PERIOD_BYTES,
+	.periods_min = SST_MIN_PERIODS,
+	.periods_max = SST_MAX_PERIODS,
+	.fifo_size = SST_FIFO_SIZE,
+};
+
+/* MFLD - MSIC */
+struct snd_soc_dai_driver sst_platform_dai[] = {
+{
+	.name = "Headset-cpu-dai",
+	.id = 0,
+	.playback = {
+		.channels_min = SST_STEREO,
+		.channels_max = SST_STEREO,
+		.rates = SNDRV_PCM_RATE_48000,
+		.formats = SNDRV_PCM_FMTBIT_S24_LE,
+	},
+},
+{
+	.name = "Speaker-cpu-dai",
+	.id = 1,
+	.playback = {
+		.channels_min = SST_MONO,
+		.channels_max = SST_STEREO,
+		.rates = SNDRV_PCM_RATE_48000,
+		.formats = SNDRV_PCM_FMTBIT_S24_LE,
+	},
+},
+{
+	.name = "Vibra1-cpu-dai",
+	.id = 2,
+	.playback = {
+		.channels_min = SST_MONO,
+		.channels_max = SST_MONO,
+		.rates = SNDRV_PCM_RATE_48000,
+		.formats = SNDRV_PCM_FMTBIT_S24_LE,
+	},
+},
+{
+	.name = "Vibra2-cpu-dai",
+	.id = 3,
+	.playback = {
+		.channels_min = SST_MONO,
+		.channels_max = SST_STEREO,
+		.rates = SNDRV_PCM_RATE_48000,
+		.formats = SNDRV_PCM_FMTBIT_S24_LE,
+	},
+},
+};
+/* helper functions */
+static int sst_platform_alloc_stream(struct snd_pcm_substream *substream)
+{
+	struct sst_runtime_stream *stream =
+			substream->runtime->private_data;
+	struct snd_sst_stream_params param = {{{0,},},};
+	struct snd_sst_params str_params = {0};
+	int ret_val;
+
+	/* set codec params and inform SST driver the same */
+
+	param.uc.pcm_params.codec = SST_CODEC_TYPE_PCM;
+	param.uc.pcm_params.num_chan = (u8) substream->runtime->channels;
+	param.uc.pcm_params.pcm_wd_sz = substream->runtime->sample_bits;
+	param.uc.pcm_params.reserved = 0;
+	param.uc.pcm_params.sfreq = substream->runtime->rate;
+	param.uc.pcm_params.ring_buffer_size =
+					snd_pcm_lib_buffer_bytes(substream);
+	param.uc.pcm_params.period_count = substream->runtime->period_size;
+	param.uc.pcm_params.ring_buffer_addr =
+				virt_to_phys(substream->dma_buffer.area);
+	substream->runtime->dma_area = substream->dma_buffer.area;
+
+	pr_debug("period_cnt = %d\n", param.uc.pcm_params.period_count);
+	pr_debug("sfreq= %d, wd_sz = %d\n",
+		 param.uc.pcm_params.sfreq, param.uc.pcm_params.pcm_wd_sz);
+
+	str_params.sparams = param;
+	str_params.codec = SST_CODEC_TYPE_PCM;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		str_params.ops = STREAM_OPS_PLAYBACK;
+		str_params.device_type = substream->pcm->device + 1;
+		pr_debug("Playbck stream,Device %d\n",
+					substream->pcm->device);
+	} else {
+		str_params.ops = STREAM_OPS_CAPTURE;
+		str_params.device_type = SND_SST_DEVICE_CAPTURE;
+		pr_debug("Capture stream,Device %d\n",
+					substream->pcm->device);
+	}
+	ret_val = stream->sstdrv_ops->control_set(SST_SND_ALLOC, &str_params);
+	pr_debug("SST_SND_PLAY/CAPTURE ret_val = %x\n", ret_val);
+	if (ret_val < 0)
+		return ret_val;
+
+	stream->stream_info.str_id = ret_val;
+	pr_debug("str id :  %d\n", stream->stream_info.str_id);
+
+	return ret_val;
+}
+
+
+static void sst_period_elapsed(void *mad_substream)
+{
+	struct snd_pcm_substream *substream = mad_substream;
+	struct sst_runtime_stream *stream;
+
+	if (!substream || !substream->runtime)
+		return;
+	stream = substream->runtime->private_data;
+	if (!stream)
+		return;
+
+	spin_lock(&stream->status_lock);
+	if (stream->stream_status != SST_PLATFORM_RUNNING) {
+		spin_unlock(&stream->status_lock);
+		return;
+	}
+	spin_unlock(&stream->status_lock);
+	snd_pcm_period_elapsed(substream);
+	return;
+}
+
+static int sst_platform_init_stream(struct snd_pcm_substream *substream)
+{
+	struct sst_runtime_stream *stream =
+			substream->runtime->private_data;
+	int ret_val;
+
+	pr_debug("setting buffer ptr param\n");
+	spin_lock(&stream->status_lock);
+	stream->stream_status = SST_PLATFORM_INIT;
+	spin_unlock(&stream->status_lock);
+	stream->stream_info.period_elapsed = sst_period_elapsed;
+	stream->stream_info.mad_substream = substream;
+	stream->stream_info.buffer_ptr = 0;
+	stream->stream_info.sfreq = substream->runtime->rate;
+	ret_val = stream->sstdrv_ops->control_set(SST_SND_STREAM_INIT,
+				&stream->stream_info);
+	if (ret_val)
+		pr_err("control_set ret error %d\n", ret_val);
+	return ret_val;
+
+}
+/* end -- helper functions */
+
+static int sst_platform_open(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime;
+	struct sst_runtime_stream *stream;
+	int ret_val = 0;
+
+	pr_debug("sst_platform_open called\n");
+
+	runtime = substream->runtime;
+	runtime->hw = sst_platform_pcm_hw;
+
+	stream = kzalloc(sizeof(*stream), GFP_KERNEL);
+	if (!stream)
+		return -ENOMEM;
+
+	spin_lock_init(&stream->status_lock);
+	stream->stream_info.str_id = 0;
+
+	spin_lock(&stream->status_lock);
+	stream->stream_status = SST_PLATFORM_INIT;
+	spin_unlock(&stream->status_lock);
+
+	stream->stream_info.mad_substream = substream;
+	/* allocate memory for SST API set */
+	stream->sstdrv_ops = kzalloc(sizeof(*stream->sstdrv_ops),
+							GFP_KERNEL);
+	if (!stream->sstdrv_ops) {
+		pr_err("sst: mem allocation for ops fail\n");
+		kfree(stream);
+		return -ENOMEM;
+	}
+	stream->sstdrv_ops->vendor_id = MSIC_VENDOR_ID;
+
+	/* registering with SST driver to get access to SST APIs to use */
+	ret_val = register_sst_card(stream->sstdrv_ops);
+	if (ret_val) {
+		pr_err("sst: sst card registration failed\n");
+		return ret_val;
+	}
+	runtime->private_data = stream;
+	return snd_pcm_hw_constraint_integer(runtime,
+			 SNDRV_PCM_HW_PARAM_PERIODS);
+}
+
+static int sst_platform_close(struct snd_pcm_substream *substream)
+{
+	struct sst_runtime_stream *stream;
+	int ret_val = 0, str_id;
+
+	pr_debug("sst_platform_close called\n");
+
+	stream = substream->runtime->private_data;
+	str_id = stream->stream_info.str_id;
+
+	if (str_id)
+		ret_val = stream->sstdrv_ops->control_set(
+					SST_SND_FREE, &str_id);
+
+	kfree(stream->sstdrv_ops);
+	kfree(stream);
+	return ret_val;
+}
+
+static int sst_platform_pcm_prepare(struct snd_pcm_substream *substream)
+{
+	struct sst_runtime_stream *stream;
+	int ret_val = 0, str_id;
+
+	pr_debug("sst_platform_pcm_prepare called\n");
+
+	stream = substream->runtime->private_data;
+	str_id = stream->stream_info.str_id;
+	if (stream->stream_info.str_id) {
+		ret_val = stream->sstdrv_ops->control_set(
+					SST_SND_DROP, &str_id);
+		return ret_val;
+	}
+
+	ret_val = sst_platform_alloc_stream(substream);
+	if (ret_val < 0)
+		return ret_val;
+	snprintf(substream->pcm->id, sizeof(substream->pcm->id),
+			"%d", stream->stream_info.str_id);
+
+	ret_val = sst_platform_init_stream(substream);
+	if (ret_val)
+		return ret_val;
+	substream->runtime->hw.info = SNDRV_PCM_INFO_BLOCK_TRANSFER;
+	return ret_val;
+}
+
+static int sst_platform_pcm_trigger(struct snd_pcm_substream *substream,
+					int cmd)
+{
+	int ret_val = 0, str_id;
+	struct sst_runtime_stream *stream;
+
+	pr_debug("sst_platform_pcm_trigger called\n");
+
+	stream = substream->runtime->private_data;
+
+	str_id = stream->stream_info.str_id;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		pr_debug("sst: Trigger Start\n");
+		ret_val = stream->sstdrv_ops->control_set(
+					SST_SND_START, &str_id);
+		if (ret_val)
+			break;
+		spin_lock(&stream->status_lock);
+		stream->stream_status = SST_PLATFORM_RUNNING;
+		spin_unlock(&stream->status_lock);
+		stream->stream_info.mad_substream = substream;
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		pr_debug("sst: in stop\n");
+		ret_val = stream->sstdrv_ops->control_set(
+				SST_SND_DROP, &str_id);
+		if (ret_val)
+			break;
+		spin_lock(&stream->status_lock);
+		stream->stream_status = SST_PLATFORM_DROPPED;
+		spin_unlock(&stream->status_lock);
+		break;
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		pr_debug("sst: in pause\n");
+		ret_val = stream->sstdrv_ops->control_set(
+				SST_SND_PAUSE, &str_id);
+		if (ret_val)
+			break;
+		spin_lock(&stream->status_lock);
+		stream->stream_status = SST_PLATFORM_PAUSED;
+		spin_unlock(&stream->status_lock);
+		break;
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		pr_debug("sst: in pause release\n");
+		ret_val = stream->sstdrv_ops->control_set(
+			SST_SND_RESUME, &str_id);
+		if (ret_val)
+			break;
+		spin_lock(&stream->status_lock);
+		stream->stream_status = SST_PLATFORM_RUNNING;
+		spin_unlock(&stream->status_lock);
+		break;
+	default:
+		ret_val = -EINVAL;
+	}
+	return ret_val;
+}
+
+
+static snd_pcm_uframes_t sst_platform_pcm_pointer
+			(struct snd_pcm_substream *substream)
+{
+	struct sst_runtime_stream *stream;
+	int ret_val;
+	struct pcm_stream_info *str_info;
+
+
+	stream = substream->runtime->private_data;
+	spin_lock(&stream->status_lock);
+	if (stream->stream_status == SST_PLATFORM_INIT) {
+		spin_unlock(&stream->status_lock);
+		return 0;
+	}
+	spin_unlock(&stream->status_lock);
+
+	str_info = &stream->stream_info;
+	ret_val = stream->sstdrv_ops->control_set(
+				SST_SND_BUFFER_POINTER, str_info);
+	if (ret_val) {
+		pr_err("sst: error code = %d\n", ret_val);
+		return ret_val;
+	}
+
+	return stream->stream_info.buffer_ptr;
+}
+
+
+static struct snd_pcm_ops sst_platform_ops = {
+	.open = sst_platform_open,
+	.close = sst_platform_close,
+	.ioctl = snd_pcm_lib_ioctl,
+	.prepare = sst_platform_pcm_prepare,
+	.trigger = sst_platform_pcm_trigger,
+	.pointer = sst_platform_pcm_pointer,
+};
+
+static void sst_pcm_free(struct snd_pcm *pcm)
+{
+	pr_debug("sst_pcm_free called\n");
+	snd_pcm_lib_preallocate_free_for_all(pcm);
+}
+
+int sst_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
+			struct snd_pcm *pcm)
+{
+	int retval = 0;
+
+	pr_debug("sst_pcm_new called\n");
+
+	if (dai->driver->playback.channels_min ||
+			dai->driver->capture.channels_min) {
+		retval =  snd_pcm_lib_preallocate_pages_for_all(pcm,
+			SNDRV_DMA_TYPE_CONTINUOUS,
+			snd_dma_continuous_data(GFP_KERNEL),
+			SST_MIN_BUFFER, SST_MAX_BUFFER);
+		if (retval) {
+			pr_err("dma buffer allocationf fail\n");
+			return retval;
+		}
+	}
+
+	return retval;
+}
+struct snd_soc_platform_driver sst_soc_platform_drv = {
+	.ops		= &sst_platform_ops,
+	.pcm_new	= sst_pcm_new,
+	.pcm_free	= sst_pcm_free,
+};
+
+static int sst_platform_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	pr_debug("sst_platform_probe called\n");
+	ret = snd_soc_register_platform(&pdev->dev, &sst_soc_platform_drv);
+	if (ret) {
+		pr_err("registering soc platform failed\n");
+		return ret;
+	}
+	ret = snd_soc_register_dais(&pdev->dev,
+				sst_platform_dai, ARRAY_SIZE(sst_platform_dai));
+	if (ret) {
+		pr_err("registering cpu dais failed\n");
+		snd_soc_unregister_platform(&pdev->dev);
+	}
+	return ret;
+}
+
+static int sst_platform_remove(struct platform_device *pdev)
+{
+
+	snd_soc_unregister_dais(&pdev->dev, ARRAY_SIZE(sst_platform_dai));
+
+	snd_soc_unregister_platform(&pdev->dev);
+	pr_debug("sst_platform_remove sucess\n");
+
+	return 0;
+}
+
+static struct platform_driver sst_platform_driver = {
+	.driver		= {
+		.name		= "sst-platform",
+		.owner		= THIS_MODULE,
+	},
+	.probe		= sst_platform_probe,
+	.remove		= sst_platform_remove,
+};
+
+static int __init sst_soc_platform_init(void)
+{
+	pr_debug("sst_soc_platform_init called\n");
+	return  platform_driver_register(&sst_platform_driver);
+}
+module_init(sst_soc_platform_init);
+
+static void __exit sst_soc_platform_exit(void)
+{
+	platform_driver_unregister(&sst_platform_driver);
+	pr_debug("sst_soc_platform_exit sucess\n");
+}
+module_exit(sst_soc_platform_exit);
+
+MODULE_DESCRIPTION("ASoC Intel(R) MID Platform driver");
+MODULE_AUTHOR("Vinod Koul <vinod.koul@intel.com>");
+MODULE_AUTHOR("Harsha Priya <priya.harsha@intel.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platfrom: sst-platform");

sound/soc/mid-x86/sst_platform.h

+/*
+ *  sst_platform.h - Intel MID Platform driver header file
+ *
+ *  Copyright (C) 2010 Intel Corp
+ *  Author: Vinod Koul <vinod.koul@intel.com>
+ *  Author: Harsha Priya <priya.harsha@intel.com>
+ *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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; version 2 of the License.
+ *
+ *  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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *
+ */
+
+#ifndef __SST_PLATFORMDRV_H__
+#define __SST_PLATFORMDRV_H__
+
+#define SST_MONO		1
+#define SST_STEREO		2
+#define SST_MAX_CAP		5
+
+#define SST_MIN_RATE		8000
+#define SST_MAX_RATE		48000
+#define SST_MIN_CHANNEL		1
+#define SST_MAX_CHANNEL		5
+#define SST_MAX_BUFFER		(800*1024)
+#define SST_MIN_BUFFER		(800*1024)
+#define SST_MIN_PERIOD_BYTES	32
+#define SST_MAX_PERIOD_BYTES	SST_MAX_BUFFER
+#define SST_MIN_PERIODS		2
+#define SST_MAX_PERIODS		(1024*2)
+#define SST_FIFO_SIZE		0
+#define SST_CARD_NAMES		"intel_mid_card"
+#define MSIC_VENDOR_ID		3
+
+struct sst_runtime_stream {
+	int     stream_status;
+	struct pcm_stream_info stream_info;
+	struct intel_sst_card_ops *sstdrv_ops;
+	spinlock_t	status_lock;
+};
+
+enum sst_drv_status {
+	SST_PLATFORM_INIT = 1,
+	SST_PLATFORM_STARTED,
+	SST_PLATFORM_RUNNING,
+	SST_PLATFORM_PAUSED,
+	SST_PLATFORM_DROPPED,
+};
+
+#endif