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Commit f7d01fd6 authored by Jarkko Nikula's avatar Jarkko Nikula Committed by Mark Brown
Browse files

ASoC: Intel: Add Intel Baytrail SST DSP IPC support 



Add support for Baytrail SST DSP IPC. This provides mechanism to communicate
with the DSP firmware.

Signed-off-by: default avatarJarkko Nikula <jarkko.nikula@linux.intel.com>
Acked-by: default avatarLiam Girdwood <liam.r.girdwood@intel.com>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent f7469663

sound/soc/intel/sst-baytrail-ipc.c

0 → 100644
+866 −0
Original line number Diff line number Diff line 
/*

 * Intel Baytrail SST IPC Support

 * Copyright (c) 2014, Intel Corporation.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope 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/types.h>

#include <linux/kernel.h>

#include <linux/list.h>

#include <linux/device.h>

#include <linux/wait.h>

#include <linux/spinlock.h>

#include <linux/workqueue.h>

#include <linux/export.h>

#include <linux/slab.h>

#include <linux/delay.h>

#include <linux/list.h>

#include <linux/platform_device.h>

#include <linux/kthread.h>

#include <linux/firmware.h>

#include <asm/div64.h>



#include "sst-baytrail-ipc.h"

#include "sst-dsp.h"

#include "sst-dsp-priv.h"



/* IPC message timeout */

#define IPC_TIMEOUT_MSECS	300

#define IPC_BOOT_MSECS		200



#define IPC_EMPTY_LIST_SIZE	8



/* IPC header bits */

#define IPC_HEADER_MSG_ID_MASK	0xff

#define IPC_HEADER_MSG_ID(x)	((x) & IPC_HEADER_MSG_ID_MASK)

#define IPC_HEADER_STR_ID_SHIFT	8

#define IPC_HEADER_STR_ID_MASK	0x1f

#define IPC_HEADER_STR_ID(x)	(((x) & 0x1f) << IPC_HEADER_STR_ID_SHIFT)

#define IPC_HEADER_LARGE_SHIFT	13

#define IPC_HEADER_LARGE(x)	(((x) & 0x1) << IPC_HEADER_LARGE_SHIFT)

#define IPC_HEADER_DATA_SHIFT	16

#define IPC_HEADER_DATA_MASK	0x3fff

#define IPC_HEADER_DATA(x)	(((x) & 0x3fff) << IPC_HEADER_DATA_SHIFT)



/* mask for differentiating between notification and reply message */

#define IPC_NOTIFICATION	(0x1 << 7)



/* I2L Stream config/control msgs */

#define IPC_IA_ALLOC_STREAM	0x20

#define IPC_IA_FREE_STREAM	0x21

#define IPC_IA_PAUSE_STREAM	0x24

#define IPC_IA_RESUME_STREAM	0x25

#define IPC_IA_DROP_STREAM	0x26

#define IPC_IA_START_STREAM	0x30



/* notification messages */

#define IPC_IA_FW_INIT_CMPLT	0x81

#define IPC_SST_PERIOD_ELAPSED	0x97



/* IPC messages between host and ADSP */

struct sst_byt_address_info {

	u32 addr;

	u32 size;

} __packed;



struct sst_byt_str_type {

	u8 codec_type;

	u8 str_type;

	u8 operation;

	u8 protected_str;

	u8 time_slots;

	u8 reserved;

	u16 result;

} __packed;



struct sst_byt_pcm_params {

	u8 num_chan;

	u8 pcm_wd_sz;

	u8 use_offload_path;

	u8 reserved;

	u32 sfreq;

	u8 channel_map[8];

} __packed;



struct sst_byt_frames_info {

	u16 num_entries;

	u16 rsrvd;

	u32 frag_size;

	struct sst_byt_address_info ring_buf_info[8];

} __packed;



struct sst_byt_alloc_params {

	struct sst_byt_str_type str_type;

	struct sst_byt_pcm_params pcm_params;

	struct sst_byt_frames_info frame_info;

} __packed;



struct sst_byt_alloc_response {

	struct sst_byt_str_type str_type;

	u8 reserved[88];

} __packed;



struct sst_byt_start_stream_params {

	u32 byte_offset;

} __packed;



struct sst_byt_tstamp {

	u64 ring_buffer_counter;

	u64 hardware_counter;

	u64 frames_decoded;

	u64 bytes_decoded;

	u64 bytes_copied;

	u32 sampling_frequency;

	u32 channel_peak[8];

} __packed;



/* driver internal IPC message structure */

struct ipc_message {

	struct list_head list;

	u64 header;



	/* direction wrt host CPU */

	char tx_data[SST_BYT_IPC_MAX_PAYLOAD_SIZE];

	size_t tx_size;

	char rx_data[SST_BYT_IPC_MAX_PAYLOAD_SIZE];

	size_t rx_size;



	wait_queue_head_t waitq;

	bool complete;

	bool wait;

	int errno;

};



struct sst_byt_stream;

struct sst_byt;



/* stream infomation */

struct sst_byt_stream {

	struct list_head node;



	/* configuration */

	struct sst_byt_alloc_params request;

	struct sst_byt_alloc_response reply;



	/* runtime info */

	struct sst_byt *byt;

	int str_id;

	bool commited;

	bool running;



	/* driver callback */

	u32 (*notify_position)(struct sst_byt_stream *stream, void *data);

	void *pdata;

};



/* SST Baytrail IPC data */

struct sst_byt {

	struct device *dev;

	struct sst_dsp *dsp;



	/* stream */

	struct list_head stream_list;



	/* boot */

	wait_queue_head_t boot_wait;

	bool boot_complete;



	/* IPC messaging */

	struct list_head tx_list;

	struct list_head rx_list;

	struct list_head empty_list;

	wait_queue_head_t wait_txq;

	struct task_struct *tx_thread;

	struct kthread_worker kworker;

	struct kthread_work kwork;

	struct ipc_message *msg;

};



static inline u64 sst_byt_header(int msg_id, int data, bool large, int str_id)

{

	u64 header;



	header = IPC_HEADER_MSG_ID(msg_id) |

		 IPC_HEADER_STR_ID(str_id) |

		 IPC_HEADER_LARGE(large) |

		 IPC_HEADER_DATA(data) |

		 SST_BYT_IPCX_BUSY;



	return header;

}



static inline u16 sst_byt_header_msg_id(u64 header)

{

	return header & IPC_HEADER_MSG_ID_MASK;

}



static inline u8 sst_byt_header_str_id(u64 header)

{

	return (header >> IPC_HEADER_STR_ID_SHIFT) & IPC_HEADER_STR_ID_MASK;

}



static inline u16 sst_byt_header_data(u64 header)

{

	return (header >> IPC_HEADER_DATA_SHIFT) & IPC_HEADER_DATA_MASK;

}



static struct sst_byt_stream *sst_byt_get_stream(struct sst_byt *byt,

						 int stream_id)

{

	struct sst_byt_stream *stream;



	list_for_each_entry(stream, &byt->stream_list, node) {

		if (stream->str_id == stream_id)

			return stream;

	}



	return NULL;

}



static void sst_byt_ipc_shim_dbg(struct sst_byt *byt, const char *text)

{

	struct sst_dsp *sst = byt->dsp;

	u64 isr, ipcd, imrx, ipcx;



	ipcx = sst_dsp_shim_read64_unlocked(sst, SST_IPCX);

	isr = sst_dsp_shim_read64_unlocked(sst, SST_ISRX);

	ipcd = sst_dsp_shim_read64_unlocked(sst, SST_IPCD);

	imrx = sst_dsp_shim_read64_unlocked(sst, SST_IMRX);



	dev_err(byt->dev,

		"ipc: --%s-- ipcx 0x%llx isr 0x%llx ipcd 0x%llx imrx 0x%llx\n",

		text, ipcx, isr, ipcd, imrx);

}



/* locks held by caller */

static struct ipc_message *sst_byt_msg_get_empty(struct sst_byt *byt)

{

	struct ipc_message *msg = NULL;



	if (!list_empty(&byt->empty_list)) {

		msg = list_first_entry(&byt->empty_list,

				       struct ipc_message, list);

		list_del(&msg->list);

	}



	return msg;

}



static void sst_byt_ipc_tx_msgs(struct kthread_work *work)

{

	struct sst_byt *byt =

		container_of(work, struct sst_byt, kwork);

	struct ipc_message *msg;

	u64 ipcx;

	unsigned long flags;



	spin_lock_irqsave(&byt->dsp->spinlock, flags);

	if (list_empty(&byt->tx_list)) {

		spin_unlock_irqrestore(&byt->dsp->spinlock, flags);

		return;

	}



	/* if the DSP is busy we will TX messages after IRQ */

	ipcx = sst_dsp_shim_read64_unlocked(byt->dsp, SST_IPCX);

	if (ipcx & SST_BYT_IPCX_BUSY) {

		spin_unlock_irqrestore(&byt->dsp->spinlock, flags);

		return;

	}



	msg = list_first_entry(&byt->tx_list, struct ipc_message, list);



	list_move(&msg->list, &byt->rx_list);



	/* send the message */

	if (msg->header & IPC_HEADER_LARGE(true))

		sst_dsp_outbox_write(byt->dsp, msg->tx_data, msg->tx_size);

	sst_dsp_shim_write64_unlocked(byt->dsp, SST_IPCX, msg->header);



	spin_unlock_irqrestore(&byt->dsp->spinlock, flags);

}



static inline void sst_byt_tx_msg_reply_complete(struct sst_byt *byt,

						 struct ipc_message *msg)

{

	msg->complete = true;



	if (!msg->wait)

		list_add_tail(&msg->list, &byt->empty_list);

	else

		wake_up(&msg->waitq);

}



static int sst_byt_tx_wait_done(struct sst_byt *byt, struct ipc_message *msg,

				void *rx_data)

{

	unsigned long flags;

	int ret;



	/* wait for DSP completion */

	ret = wait_event_timeout(msg->waitq, msg->complete,

				 msecs_to_jiffies(IPC_TIMEOUT_MSECS));



	spin_lock_irqsave(&byt->dsp->spinlock, flags);

	if (ret == 0) {

		list_del(&msg->list);

		sst_byt_ipc_shim_dbg(byt, "message timeout");



		ret = -ETIMEDOUT;

	} else {



		/* copy the data returned from DSP */

		if (msg->rx_size)

			memcpy(rx_data, msg->rx_data, msg->rx_size);

		ret = msg->errno;

	}



	list_add_tail(&msg->list, &byt->empty_list);

	spin_unlock_irqrestore(&byt->dsp->spinlock, flags);

	return ret;

}



static int sst_byt_ipc_tx_message(struct sst_byt *byt, u64 header,

				  void *tx_data, size_t tx_bytes,

				  void *rx_data, size_t rx_bytes, int wait)

{

	unsigned long flags;

	struct ipc_message *msg;



	spin_lock_irqsave(&byt->dsp->spinlock, flags);



	msg = sst_byt_msg_get_empty(byt);

	if (msg == NULL) {

		spin_unlock_irqrestore(&byt->dsp->spinlock, flags);

		return -EBUSY;

	}



	msg->header = header;

	msg->tx_size = tx_bytes;

	msg->rx_size = rx_bytes;

	msg->wait = wait;

	msg->errno = 0;

	msg->complete = false;



	if (tx_bytes) {

		/* msg content = lower 32-bit of the header + data */

		*(u32 *)msg->tx_data = (u32)(header & (u32)-1);

		memcpy(msg->tx_data + sizeof(u32), tx_data, tx_bytes);

		msg->tx_size += sizeof(u32);

	}



	list_add_tail(&msg->list, &byt->tx_list);

	spin_unlock_irqrestore(&byt->dsp->spinlock, flags);



	queue_kthread_work(&byt->kworker, &byt->kwork);



	if (wait)

		return sst_byt_tx_wait_done(byt, msg, rx_data);

	else

		return 0;

}



static inline int sst_byt_ipc_tx_msg_wait(struct sst_byt *byt, u64 header,

					  void *tx_data, size_t tx_bytes,

					  void *rx_data, size_t rx_bytes)

{

	return sst_byt_ipc_tx_message(byt, header, tx_data, tx_bytes,

				      rx_data, rx_bytes, 1);

}



static inline int sst_byt_ipc_tx_msg_nowait(struct sst_byt *byt, u64 header,

						void *tx_data, size_t tx_bytes)

{

	return sst_byt_ipc_tx_message(byt, header, tx_data, tx_bytes,

				      NULL, 0, 0);

}



static struct ipc_message *sst_byt_reply_find_msg(struct sst_byt *byt,

						  u64 header)

{

	struct ipc_message *msg = NULL, *_msg;

	u64 mask;



	/* match reply to message sent based on msg and stream IDs */

	mask = IPC_HEADER_MSG_ID_MASK |

	       IPC_HEADER_STR_ID_MASK << IPC_HEADER_STR_ID_SHIFT;

	header &= mask;



	if (list_empty(&byt->rx_list)) {

		dev_err(byt->dev,

			"ipc: rx list is empty but received 0x%llx\n", header);

		goto out;

	}



	list_for_each_entry(_msg, &byt->rx_list, list) {

		if ((_msg->header & mask) == header) {

			msg = _msg;

			break;

		}

	}



out:

	return msg;

}



static void sst_byt_stream_update(struct sst_byt *byt, struct ipc_message *msg)

{

	struct sst_byt_stream *stream;

	u64 header = msg->header;

	u8 stream_id = sst_byt_header_str_id(header);

	u8 stream_msg = sst_byt_header_msg_id(header);



	stream = sst_byt_get_stream(byt, stream_id);

	if (stream == NULL)

		return;



	switch (stream_msg) {

	case IPC_IA_DROP_STREAM:

	case IPC_IA_PAUSE_STREAM:

	case IPC_IA_FREE_STREAM:

		stream->running = false;

		break;

	case IPC_IA_START_STREAM:

	case IPC_IA_RESUME_STREAM:

		stream->running = true;

		break;

	}

}



static int sst_byt_process_reply(struct sst_byt *byt, u64 header)

{

	struct ipc_message *msg;



	msg = sst_byt_reply_find_msg(byt, header);

	if (msg == NULL)

		return 1;



	if (header & IPC_HEADER_LARGE(true)) {

		msg->rx_size = sst_byt_header_data(header);

		sst_dsp_inbox_read(byt->dsp, msg->rx_data, msg->rx_size);

	}



	/* update any stream states */

	sst_byt_stream_update(byt, msg);



	list_del(&msg->list);

	/* wake up */

	sst_byt_tx_msg_reply_complete(byt, msg);



	return 1;

}



static void sst_byt_fw_ready(struct sst_byt *byt, u64 header)

{

	dev_dbg(byt->dev, "ipc: DSP is ready 0x%llX\n", header);



	byt->boot_complete = true;

	wake_up(&byt->boot_wait);

}



static int sst_byt_process_notification(struct sst_byt *byt,

					unsigned long *flags)

{

	struct sst_dsp *sst = byt->dsp;

	struct sst_byt_stream *stream;

	u64 header;

	u8 msg_id, stream_id;

	int handled = 1;



	header = sst_dsp_shim_read64_unlocked(sst, SST_IPCD);

	msg_id = sst_byt_header_msg_id(header);



	switch (msg_id) {

	case IPC_SST_PERIOD_ELAPSED:

		stream_id = sst_byt_header_str_id(header);

		stream = sst_byt_get_stream(byt, stream_id);

		if (stream && stream->running && stream->notify_position) {

			spin_unlock_irqrestore(&sst->spinlock, *flags);

			stream->notify_position(stream, stream->pdata);

			spin_lock_irqsave(&sst->spinlock, *flags);

		}

		break;

	case IPC_IA_FW_INIT_CMPLT:

		sst_byt_fw_ready(byt, header);

		break;

	}



	return handled;

}



static irqreturn_t sst_byt_irq_thread(int irq, void *context)

{

	struct sst_dsp *sst = (struct sst_dsp *) context;

	struct sst_byt *byt = sst_dsp_get_thread_context(sst);

	u64 header;

	unsigned long flags;



	spin_lock_irqsave(&sst->spinlock, flags);



	header = sst_dsp_shim_read64_unlocked(sst, SST_IPCD);

	if (header & SST_BYT_IPCD_BUSY) {

		if (header & IPC_NOTIFICATION) {

			/* message from ADSP */

			sst_byt_process_notification(byt, &flags);

		} else {

			/* reply from ADSP */

			sst_byt_process_reply(byt, header);

		}

		/*

		 * clear IPCD BUSY bit and set DONE bit. Tell DSP we have

		 * processed the message and can accept new. Clear data part

		 * of the header

		 */

		sst_dsp_shim_update_bits64_unlocked(sst, SST_IPCD,

			SST_BYT_IPCD_DONE | SST_BYT_IPCD_BUSY |

			IPC_HEADER_DATA(IPC_HEADER_DATA_MASK),

			SST_BYT_IPCD_DONE);

		/* unmask message request interrupts */

		sst_dsp_shim_update_bits64_unlocked(sst, SST_IMRX,

			SST_BYT_IMRX_REQUEST, 0);

	}



	spin_unlock_irqrestore(&sst->spinlock, flags);



	/* continue to send any remaining messages... */

	queue_kthread_work(&byt->kworker, &byt->kwork);



	return IRQ_HANDLED;

}



/* stream API */

struct sst_byt_stream *sst_byt_stream_new(struct sst_byt *byt, int id,

	u32 (*notify_position)(struct sst_byt_stream *stream, void *data),

	void *data)

{

	struct sst_byt_stream *stream;



	stream = kzalloc(sizeof(*stream), GFP_KERNEL);

	if (stream == NULL)

		return NULL;



	list_add(&stream->node, &byt->stream_list);

	stream->notify_position = notify_position;

	stream->pdata = data;

	stream->byt = byt;

	stream->str_id = id;



	return stream;

}



int sst_byt_stream_set_bits(struct sst_byt *byt, struct sst_byt_stream *stream,

			    int bits)

{

	stream->request.pcm_params.pcm_wd_sz = bits;

	return 0;

}



int sst_byt_stream_set_channels(struct sst_byt *byt,

				struct sst_byt_stream *stream, u8 channels)

{

	stream->request.pcm_params.num_chan = channels;

	return 0;

}



int sst_byt_stream_set_rate(struct sst_byt *byt, struct sst_byt_stream *stream,

			    unsigned int rate)

{

	stream->request.pcm_params.sfreq = rate;

	return 0;

}



/* stream sonfiguration */

int sst_byt_stream_type(struct sst_byt *byt, struct sst_byt_stream *stream,

			int codec_type, int stream_type, int operation)

{

	stream->request.str_type.codec_type = codec_type;

	stream->request.str_type.str_type = stream_type;

	stream->request.str_type.operation = operation;

	stream->request.str_type.time_slots = 0xc;



	return 0;

}



int sst_byt_stream_buffer(struct sst_byt *byt, struct sst_byt_stream *stream,

			  uint32_t buffer_addr, uint32_t buffer_size)

{

	stream->request.frame_info.num_entries = 1;

	stream->request.frame_info.ring_buf_info[0].addr = buffer_addr;

	stream->request.frame_info.ring_buf_info[0].size = buffer_size;

	/* calculate bytes per 4 ms fragment */

	stream->request.frame_info.frag_size =

		stream->request.pcm_params.sfreq *

		stream->request.pcm_params.num_chan *

		stream->request.pcm_params.pcm_wd_sz / 8 *

		4 / 1000;

	return 0;

}



int sst_byt_stream_commit(struct sst_byt *byt, struct sst_byt_stream *stream)

{

	struct sst_byt_alloc_params *str_req = &stream->request;

	struct sst_byt_alloc_response *reply = &stream->reply;

	u64 header;

	int ret;



	header = sst_byt_header(IPC_IA_ALLOC_STREAM,

				sizeof(*str_req) + sizeof(u32),

				true, stream->str_id);

	ret = sst_byt_ipc_tx_msg_wait(byt, header, str_req, sizeof(*str_req),

				      reply, sizeof(*reply));

	if (ret < 0) {

		dev_err(byt->dev, "ipc: error stream commit failed\n");

		return ret;

	}



	stream->commited = true;



	return 0;

}



int sst_byt_stream_free(struct sst_byt *byt, struct sst_byt_stream *stream)

{

	u64 header;

	int ret = 0;



	if (!stream->commited)

		goto out;



	header = sst_byt_header(IPC_IA_FREE_STREAM, 0, false, stream->str_id);

	ret = sst_byt_ipc_tx_msg_wait(byt, header, NULL, 0, NULL, 0);

	if (ret < 0) {

		dev_err(byt->dev, "ipc: free stream %d failed\n",

			stream->str_id);

		return -EAGAIN;

	}



	stream->commited = false;

out:

	list_del(&stream->node);

	kfree(stream);



	return ret;

}



static int sst_byt_stream_operations(struct sst_byt *byt, int type,

				     int stream_id, int wait)

{

	struct sst_byt_start_stream_params start_stream;

	u64 header;

	void *tx_msg = NULL;

	size_t size = 0;



	if (type != IPC_IA_START_STREAM) {

		header = sst_byt_header(type, 0, false, stream_id);

	} else {

		start_stream.byte_offset = 0;

		header = sst_byt_header(IPC_IA_START_STREAM,

					sizeof(start_stream) + sizeof(u32),

					true, stream_id);

		tx_msg = &start_stream;

		size = sizeof(start_stream);

	}



	if (wait)

		return sst_byt_ipc_tx_msg_wait(byt, header,

					       tx_msg, size, NULL, 0);

	else

		return sst_byt_ipc_tx_msg_nowait(byt, header, tx_msg, size);

}



/* stream ALSA trigger operations */

int sst_byt_stream_start(struct sst_byt *byt, struct sst_byt_stream *stream)

{

	int ret;



	ret = sst_byt_stream_operations(byt, IPC_IA_START_STREAM,

					stream->str_id, 0);

	if (ret < 0)

		dev_err(byt->dev, "ipc: error failed to start stream %d\n",

			stream->str_id);



	return ret;

}



int sst_byt_stream_stop(struct sst_byt *byt, struct sst_byt_stream *stream)

{

	int ret;



	/* don't stop streams that are not commited */

	if (!stream->commited)

		return 0;



	ret = sst_byt_stream_operations(byt, IPC_IA_DROP_STREAM,

					stream->str_id, 0);

	if (ret < 0)

		dev_err(byt->dev, "ipc: error failed to stop stream %d\n",

			stream->str_id);

	return ret;

}



int sst_byt_stream_pause(struct sst_byt *byt, struct sst_byt_stream *stream)

{

	int ret;



	ret = sst_byt_stream_operations(byt, IPC_IA_PAUSE_STREAM,

					stream->str_id, 0);

	if (ret < 0)

		dev_err(byt->dev, "ipc: error failed to pause stream %d\n",

			stream->str_id);



	return ret;

}



int sst_byt_stream_resume(struct sst_byt *byt, struct sst_byt_stream *stream)

{

	int ret;



	ret = sst_byt_stream_operations(byt, IPC_IA_RESUME_STREAM,

					stream->str_id, 0);

	if (ret < 0)

		dev_err(byt->dev, "ipc: error failed to resume stream %d\n",

			stream->str_id);



	return ret;

}



int sst_byt_get_dsp_position(struct sst_byt *byt,

			     struct sst_byt_stream *stream, int buffer_size)

{

	struct sst_dsp *sst = byt->dsp;

	struct sst_byt_tstamp fw_tstamp;

	u8 str_id = stream->str_id;

	u32 tstamp_offset;



	tstamp_offset = SST_BYT_TIMESTAMP_OFFSET + str_id * sizeof(fw_tstamp);

	memcpy_fromio(&fw_tstamp,

		      sst->addr.lpe + tstamp_offset, sizeof(fw_tstamp));



	return do_div(fw_tstamp.ring_buffer_counter, buffer_size);

}



static int msg_empty_list_init(struct sst_byt *byt)

{

	struct ipc_message *msg;

	int i;



	byt->msg = kzalloc(sizeof(*msg) * IPC_EMPTY_LIST_SIZE, GFP_KERNEL);

	if (byt->msg == NULL)

		return -ENOMEM;



	for (i = 0; i < IPC_EMPTY_LIST_SIZE; i++) {

		init_waitqueue_head(&byt->msg[i].waitq);

		list_add(&byt->msg[i].list, &byt->empty_list);

	}



	return 0;

}



struct sst_dsp *sst_byt_get_dsp(struct sst_byt *byt)

{

	return byt->dsp;

}



static struct sst_dsp_device byt_dev = {

	.thread = sst_byt_irq_thread,

	.ops = &sst_byt_ops,

};



int sst_byt_dsp_init(struct device *dev, struct sst_pdata *pdata)

{

	struct sst_byt *byt;

	struct sst_fw *byt_sst_fw;

	int err;



	dev_dbg(dev, "initialising Byt DSP IPC\n");



	byt = devm_kzalloc(dev, sizeof(*byt), GFP_KERNEL);

	if (byt == NULL)

		return -ENOMEM;



	byt->dev = dev;

	INIT_LIST_HEAD(&byt->stream_list);

	INIT_LIST_HEAD(&byt->tx_list);

	INIT_LIST_HEAD(&byt->rx_list);

	INIT_LIST_HEAD(&byt->empty_list);

	init_waitqueue_head(&byt->boot_wait);

	init_waitqueue_head(&byt->wait_txq);



	err = msg_empty_list_init(byt);

	if (err < 0)

		goto list_err;



	/* start the IPC message thread */

	init_kthread_worker(&byt->kworker);

	byt->tx_thread = kthread_run(kthread_worker_fn,

				     &byt->kworker,

				     dev_name(byt->dev));

	if (IS_ERR(byt->tx_thread)) {

		err = PTR_ERR(byt->tx_thread);

		dev_err(byt->dev, "error failed to create message TX task\n");

		goto list_err;

	}

	init_kthread_work(&byt->kwork, sst_byt_ipc_tx_msgs);



	byt_dev.thread_context = byt;



	/* init SST shim */

	byt->dsp = sst_dsp_new(dev, &byt_dev, pdata);

	if (byt->dsp == NULL) {

		err = -ENODEV;

		goto list_err;

	}



	/* keep the DSP in reset state for base FW loading */

	sst_dsp_reset(byt->dsp);



	byt_sst_fw = sst_fw_new(byt->dsp, pdata->fw, byt);

	if (byt_sst_fw  == NULL) {

		err = -ENODEV;

		dev_err(dev, "error: failed to load firmware\n");

		goto fw_err;

	}



	/* wait for DSP boot completion */

	sst_dsp_boot(byt->dsp);

	err = wait_event_timeout(byt->boot_wait, byt->boot_complete,

				 msecs_to_jiffies(IPC_BOOT_MSECS));

	if (err == 0) {

		err = -EIO;

		dev_err(byt->dev, "ipc: error DSP boot timeout\n");

		goto boot_err;

	}



	pdata->dsp = byt;



	return 0;



boot_err:

	sst_dsp_reset(byt->dsp);

	sst_fw_free(byt_sst_fw);

fw_err:

	sst_dsp_free(byt->dsp);

	kfree(byt->msg);

list_err:

	kfree(byt);

	return err;

}

EXPORT_SYMBOL_GPL(sst_byt_dsp_init);



void sst_byt_dsp_free(struct device *dev, struct sst_pdata *pdata)

{

	struct sst_byt *byt = pdata->dsp;



	sst_dsp_reset(byt->dsp);

	sst_fw_free_all(byt->dsp);

	sst_dsp_free(byt->dsp);

	kfree(byt->msg);

}

EXPORT_SYMBOL_GPL(sst_byt_dsp_free);

sound/soc/intel/sst-baytrail-ipc.h

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Original line number Diff line number Diff line 
/*

 * Intel Baytrail SST IPC Support

 * Copyright (c) 2014, Intel Corporation.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope 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.

 */



#ifndef __SST_BYT_IPC_H

#define __SST_BYT_IPC_H



#include <linux/types.h>



struct sst_byt;

struct sst_byt_stream;

struct sst_pdata;

extern struct sst_ops sst_byt_ops;





#define SST_BYT_MAILBOX_OFFSET		0x144000

#define SST_BYT_TIMESTAMP_OFFSET	(SST_BYT_MAILBOX_OFFSET + 0x800)



/**

 * Upfront defined maximum message size that is

 * expected by the in/out communication pipes in FW.

 */

#define SST_BYT_IPC_MAX_PAYLOAD_SIZE	200



/* stream API */

struct sst_byt_stream *sst_byt_stream_new(struct sst_byt *byt, int id,

	uint32_t (*get_write_position)(struct sst_byt_stream *stream,

				       void *data),

	void *data);



/* stream configuration */

int sst_byt_stream_set_bits(struct sst_byt *byt, struct sst_byt_stream *stream,

			    int bits);

int sst_byt_stream_set_channels(struct sst_byt *byt,

				struct sst_byt_stream *stream, u8 channels);

int sst_byt_stream_set_rate(struct sst_byt *byt, struct sst_byt_stream *stream,

			    unsigned int rate);

int sst_byt_stream_type(struct sst_byt *byt, struct sst_byt_stream *stream,

			int codec_type, int stream_type, int operation);

int sst_byt_stream_buffer(struct sst_byt *byt, struct sst_byt_stream *stream,

			  uint32_t buffer_addr, uint32_t buffer_size);

int sst_byt_stream_commit(struct sst_byt *byt, struct sst_byt_stream *stream);

int sst_byt_stream_free(struct sst_byt *byt, struct sst_byt_stream *stream);



/* stream ALSA trigger operations */

int sst_byt_stream_start(struct sst_byt *byt, struct sst_byt_stream *stream);

int sst_byt_stream_stop(struct sst_byt *byt, struct sst_byt_stream *stream);

int sst_byt_stream_pause(struct sst_byt *byt, struct sst_byt_stream *stream);

int sst_byt_stream_resume(struct sst_byt *byt, struct sst_byt_stream *stream);



int sst_byt_get_dsp_position(struct sst_byt *byt,

			     struct sst_byt_stream *stream, int buffer_size);



/* init */

int sst_byt_dsp_init(struct device *dev, struct sst_pdata *pdata);

void sst_byt_dsp_free(struct device *dev, struct sst_pdata *pdata);

struct sst_dsp *sst_byt_get_dsp(struct sst_byt *byt);



#endif