ASoC: Intel: sst - add pcm ops handling

This patch adds low level IPC handling for pcm stream operations

Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/intel/sst/sst_drv_interface.c b/sound/soc/intel/sst/sst_drv_interface.c
new file mode 100644 (file)
index 0000000..aadb0db
--- /dev/null
+++ b/sound/soc/intel/sst/sst_drv_interface.c
@@ -0,0 +1,403 @@
+/*
+ *  sst_drv_interface.c - Intel SST Driver for audio engine
+ *
+ *  Copyright (C) 2008-14 Intel Corp
+ *  Authors:   Vinod Koul <vinod.koul@intel.com>
+ *             Harsha Priya <priya.harsha@intel.com>
+ *             Dharageswari R <dharageswari.r@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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/fs.h>
+#include <linux/firmware.h>
+#include <linux/pm_runtime.h>
+#include <linux/pm_qos.h>
+#include <linux/math64.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/soc.h>
+#include <sound/compress_driver.h>
+#include <asm/platform_sst_audio.h>
+#include "../sst-mfld-platform.h"
+#include "sst.h"
+#include "../sst-dsp.h"
+
+
+
+#define NUM_CODEC 2
+#define MIN_FRAGMENT 2
+#define MAX_FRAGMENT 4
+#define MIN_FRAGMENT_SIZE (50 * 1024)
+#define MAX_FRAGMENT_SIZE (1024 * 1024)
+#define SST_GET_BYTES_PER_SAMPLE(pcm_wd_sz)  (((pcm_wd_sz + 15) >> 4) << 1)
+
+int free_stream_context(struct intel_sst_drv *ctx, unsigned int str_id)
+{
+       struct stream_info *stream;
+       int ret = 0;
+
+       stream = get_stream_info(ctx, str_id);
+       if (stream) {
+               /* str_id is valid, so stream is alloacted */
+               ret = sst_free_stream(ctx, str_id);
+               if (ret)
+                       sst_clean_stream(&ctx->streams[str_id]);
+               return ret;
+       }
+       return ret;
+}
+
+int sst_get_stream_allocated(struct intel_sst_drv *ctx,
+       struct snd_sst_params *str_param,
+       struct snd_sst_lib_download **lib_dnld)
+{
+       int retval;
+
+       retval = ctx->ops->alloc_stream(ctx, str_param);
+       if (retval > 0)
+               dev_dbg(ctx->dev, "Stream allocated %d\n", retval);
+       return retval;
+
+}
+
+/*
+ * sst_get_sfreq - this function returns the frequency of the stream
+ *
+ * @str_param : stream params
+ */
+int sst_get_sfreq(struct snd_sst_params *str_param)
+{
+       switch (str_param->codec) {
+       case SST_CODEC_TYPE_PCM:
+               return str_param->sparams.uc.pcm_params.sfreq;
+       case SST_CODEC_TYPE_AAC:
+               return str_param->sparams.uc.aac_params.externalsr;
+       case SST_CODEC_TYPE_MP3:
+               return 0;
+       default:
+               return -EINVAL;
+       }
+}
+
+/*
+ * sst_get_sfreq - this function returns the frequency of the stream
+ *
+ * @str_param : stream params
+ */
+int sst_get_num_channel(struct snd_sst_params *str_param)
+{
+       switch (str_param->codec) {
+       case SST_CODEC_TYPE_PCM:
+               return str_param->sparams.uc.pcm_params.num_chan;
+       case SST_CODEC_TYPE_MP3:
+               return str_param->sparams.uc.mp3_params.num_chan;
+       case SST_CODEC_TYPE_AAC:
+               return str_param->sparams.uc.aac_params.num_chan;
+       default:
+               return -EINVAL;
+       }
+}
+
+/*
+ * sst_get_stream - this function prepares for stream allocation
+ *
+ * @str_param : stream param
+ */
+int sst_get_stream(struct intel_sst_drv *ctx,
+                       struct snd_sst_params *str_param)
+{
+       int retval;
+       struct stream_info *str_info;
+
+       /* stream is not allocated, we are allocating */
+       retval = ctx->ops->alloc_stream(ctx, str_param);
+       if (retval <= 0) {
+               return -EIO;
+       }
+       /* store sampling freq */
+       str_info = &ctx->streams[retval];
+       str_info->sfreq = sst_get_sfreq(str_param);
+
+       return retval;
+}
+
+static int sst_power_control(struct device *dev, bool state)
+{
+       struct intel_sst_drv *ctx = dev_get_drvdata(dev);
+
+       dev_dbg(ctx->dev, "state:%d", state);
+       if (state == true)
+               return pm_runtime_get_sync(dev);
+       else
+               return sst_pm_runtime_put(ctx);
+}
+
+/*
+ * sst_open_pcm_stream - Open PCM interface
+ *
+ * @str_param: parameters of pcm stream
+ *
+ * This function is called by MID sound card driver to open
+ * a new pcm interface
+ */
+static int sst_open_pcm_stream(struct device *dev,
+               struct snd_sst_params *str_param)
+{
+       int retval;
+       struct intel_sst_drv *ctx = dev_get_drvdata(dev);
+
+       if (!str_param)
+               return -EINVAL;
+
+       retval = pm_runtime_get_sync(ctx->dev);
+       if (retval < 0)
+               return retval;
+       retval = sst_get_stream(ctx, str_param);
+       if (retval > 0) {
+               ctx->stream_cnt++;
+       } else {
+               dev_err(ctx->dev, "sst_get_stream returned err %d\n", retval);
+               sst_pm_runtime_put(ctx);
+       }
+
+       return retval;
+}
+
+/*
+ * sst_close_pcm_stream - Close PCM interface
+ *
+ * @str_id: stream id to be closed
+ *
+ * This function is called by MID sound card driver to close
+ * an existing pcm interface
+ */
+static int sst_close_pcm_stream(struct device *dev, unsigned int str_id)
+{
+       struct stream_info *stream;
+       int retval = 0;
+       struct intel_sst_drv *ctx = dev_get_drvdata(dev);
+
+       stream = get_stream_info(ctx, str_id);
+       if (!stream) {
+               dev_err(ctx->dev, "stream info is NULL for str %d!!!\n", str_id);
+               return -EINVAL;
+       }
+
+       if (stream->status == STREAM_RESET) {
+               /* silently fail here as we have cleaned the stream earlier */
+               dev_dbg(ctx->dev, "stream in reset state...\n");
+
+               retval = 0;
+               goto put;
+       }
+
+       retval = free_stream_context(ctx, str_id);
+put:
+       stream->pcm_substream = NULL;
+       stream->status = STREAM_UN_INIT;
+       stream->period_elapsed = NULL;
+       ctx->stream_cnt--;
+
+       sst_pm_runtime_put(ctx);
+
+       dev_dbg(ctx->dev, "Exit\n");
+       return 0;
+}
+
+static inline int sst_calc_tstamp(struct intel_sst_drv *ctx,
+               struct pcm_stream_info *info,
+               struct snd_pcm_substream *substream,
+               struct snd_sst_tstamp *fw_tstamp)
+{
+       size_t delay_bytes, delay_frames;
+       size_t buffer_sz;
+       u32 pointer_bytes, pointer_samples;
+
+       dev_dbg(ctx->dev, "mrfld ring_buffer_counter %llu in bytes\n",
+                       fw_tstamp->ring_buffer_counter);
+       dev_dbg(ctx->dev, "mrfld hardware_counter %llu in bytes\n",
+                        fw_tstamp->hardware_counter);
+       if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+               delay_bytes = (size_t) (fw_tstamp->ring_buffer_counter -
+                                       fw_tstamp->hardware_counter);
+       else
+               delay_bytes = (size_t) (fw_tstamp->hardware_counter -
+                                       fw_tstamp->ring_buffer_counter);
+       delay_frames = bytes_to_frames(substream->runtime, delay_bytes);
+       buffer_sz = snd_pcm_lib_buffer_bytes(substream);
+       div_u64_rem(fw_tstamp->ring_buffer_counter, buffer_sz, &pointer_bytes);
+       pointer_samples = bytes_to_samples(substream->runtime, pointer_bytes);
+
+       dev_dbg(ctx->dev, "pcm delay %zu in bytes\n", delay_bytes);
+
+       info->buffer_ptr = pointer_samples / substream->runtime->channels;
+
+       info->pcm_delay = delay_frames / substream->runtime->channels;
+       dev_dbg(ctx->dev, "buffer ptr %llu pcm_delay rep: %llu\n",
+                       info->buffer_ptr, info->pcm_delay);
+       return 0;
+}
+
+static int sst_read_timestamp(struct device *dev, struct pcm_stream_info *info)
+{
+       struct stream_info *stream;
+       struct snd_pcm_substream *substream;
+       struct snd_sst_tstamp fw_tstamp;
+       unsigned int str_id;
+       struct intel_sst_drv *ctx = dev_get_drvdata(dev);
+
+       str_id = info->str_id;
+       stream = get_stream_info(ctx, str_id);
+       if (!stream)
+               return -EINVAL;
+
+       if (!stream->pcm_substream)
+               return -EINVAL;
+       substream = stream->pcm_substream;
+
+       memcpy_fromio(&fw_tstamp,
+               ((void *)(ctx->mailbox + ctx->tstamp)
+                       + (str_id * sizeof(fw_tstamp))),
+               sizeof(fw_tstamp));
+       return sst_calc_tstamp(ctx, info, substream, &fw_tstamp);
+}
+
+static int sst_stream_start(struct device *dev, int str_id)
+{
+       struct stream_info *str_info;
+       struct intel_sst_drv *ctx = dev_get_drvdata(dev);
+
+       if (ctx->sst_state != SST_FW_RUNNING)
+               return 0;
+       str_info = get_stream_info(ctx, str_id);
+       if (!str_info)
+               return -EINVAL;
+       str_info->prev = str_info->status;
+       str_info->status = STREAM_RUNNING;
+       sst_start_stream(ctx, str_id);
+
+       return 0;
+}
+
+static int sst_stream_drop(struct device *dev, int str_id)
+{
+       struct stream_info *str_info;
+       struct intel_sst_drv *ctx = dev_get_drvdata(dev);
+
+       if (ctx->sst_state != SST_FW_RUNNING)
+               return 0;
+
+       str_info = get_stream_info(ctx, str_id);
+       if (!str_info)
+               return -EINVAL;
+       str_info->prev = STREAM_UN_INIT;
+       str_info->status = STREAM_INIT;
+       return sst_drop_stream(ctx, str_id);
+}
+
+static int sst_stream_init(struct device *dev, struct pcm_stream_info *str_info)
+{
+       int str_id = 0;
+       struct stream_info *stream;
+       struct intel_sst_drv *ctx = dev_get_drvdata(dev);
+
+       str_id = str_info->str_id;
+
+       if (ctx->sst_state != SST_FW_RUNNING)
+               return 0;
+
+       stream = get_stream_info(ctx, str_id);
+       if (!stream)
+               return -EINVAL;
+
+       dev_dbg(ctx->dev, "setting the period ptrs\n");
+       stream->pcm_substream = str_info->arg;
+       stream->period_elapsed = str_info->period_elapsed;
+       stream->sfreq = str_info->sfreq;
+       stream->prev = stream->status;
+       stream->status = STREAM_INIT;
+       dev_dbg(ctx->dev,
+               "pcm_substream %p, period_elapsed %p, sfreq %d, status %d\n",
+               stream->pcm_substream, stream->period_elapsed,
+               stream->sfreq, stream->status);
+
+       return 0;
+}
+
+/*
+ * sst_set_byte_stream - Set generic params
+ *
+ * @cmd: control cmd to be set
+ * @arg: command argument
+ *
+ * This function is called by MID sound card driver to configure
+ * SST runtime params.
+ */
+static int sst_send_byte_stream(struct device *dev,
+               struct snd_sst_bytes_v2 *bytes)
+{
+       int ret_val = 0;
+       struct intel_sst_drv *ctx = dev_get_drvdata(dev);
+
+       if (NULL == bytes)
+               return -EINVAL;
+       ret_val = pm_runtime_get_sync(ctx->dev);
+       if (ret_val < 0)
+               return ret_val;
+
+       ret_val = sst_send_byte_stream_mrfld(ctx, bytes);
+       sst_pm_runtime_put(ctx);
+
+       return ret_val;
+}
+
+static struct sst_ops pcm_ops = {
+       .open = sst_open_pcm_stream,
+       .stream_init = sst_stream_init,
+       .stream_start = sst_stream_start,
+       .stream_drop = sst_stream_drop,
+       .stream_read_tstamp = sst_read_timestamp,
+       .send_byte_stream = sst_send_byte_stream,
+       .close = sst_close_pcm_stream,
+       .power = sst_power_control,
+};
+
+static struct sst_device sst_dsp_device = {
+       .name = "Intel(R) SST LPE",
+       .dev = NULL,
+       .ops = &pcm_ops,
+};
+
+/*
+ * sst_register - function to register DSP
+ *
+ * This functions registers DSP with the platform driver
+ */
+int sst_register(struct device *dev)
+{
+       int ret_val;
+
+       sst_dsp_device.dev = dev;
+       ret_val = sst_register_dsp(&sst_dsp_device);
+       if (ret_val)
+               dev_err(dev, "Unable to register DSP with platform driver\n");
+
+       return ret_val;
+}
+
+int sst_unregister(struct device *dev)
+{
+       return sst_unregister_dsp(&sst_dsp_device);
+}