[alsa-devel] [PATCH 3/7] ASoC: Intel: Add Intel Baytrail SST DSP IPC support
Jarkko Nikula
jarkko.nikula at linux.intel.com
Mon Feb 24 16:26:58 CET 2014
Add support for Baytrail SST DSP IPC. This provides mechanism to communicate
with the DSP firmware.
Signed-off-by: Jarkko Nikula <jarkko.nikula at linux.intel.com>
---
sound/soc/intel/sst-baytrail-ipc.c | 866 +++++++++++++++++++++++++++++++++++++
sound/soc/intel/sst-baytrail-ipc.h | 69 +++
2 files changed, 935 insertions(+)
create mode 100644 sound/soc/intel/sst-baytrail-ipc.c
create mode 100644 sound/soc/intel/sst-baytrail-ipc.h
diff --git a/sound/soc/intel/sst-baytrail-ipc.c b/sound/soc/intel/sst-baytrail-ipc.c
new file mode 100644
index 000000000000..8c91a68b90bc
--- /dev/null
+++ b/sound/soc/intel/sst-baytrail-ipc.c
@@ -0,0 +1,866 @@
+/*
+ * 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);
diff --git a/sound/soc/intel/sst-baytrail-ipc.h b/sound/soc/intel/sst-baytrail-ipc.h
new file mode 100644
index 000000000000..f172b6440fa9
--- /dev/null
+++ b/sound/soc/intel/sst-baytrail-ipc.h
@@ -0,0 +1,69 @@
+/*
+ * 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
--
1.8.5.3
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