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+/*
+ * 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);
+}