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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
//
// This file is provided under a dual BSD/GPLv2 license. When using or
// redistributing this file, you may do so under either license.
//
// Copyright(c) 2018 Intel Corporation. All rights reserved.
//
// Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
//
// Generic IPC layer that can work over MMIO and SPI/I2C. PHY layer provided
// by platform driver code.
//
#include <linux/mutex.h>
#include <linux/types.h>
#include "sof-priv.h"
#include "sof-audio.h"
#include "ops.h"
/**
* sof_ipc_send_msg - generic function to prepare and send one IPC message
* @sdev: pointer to SOF core device struct
* @msg_data: pointer to a message to send
* @msg_bytes: number of bytes in the message
* @reply_bytes: number of bytes available for the reply.
* The buffer for the reply data is not passed to this
* function, the available size is an information for the
* reply handling functions.
*
* On success the function returns 0, otherwise negative error number.
*
* Note: higher level sdev->ipc->tx_mutex must be held to make sure that
* transfers are synchronized.
*/
int sof_ipc_send_msg(struct snd_sof_dev *sdev, void *msg_data, size_t msg_bytes,
size_t reply_bytes)
{
struct snd_sof_ipc *ipc = sdev->ipc;
struct snd_sof_ipc_msg *msg;
int ret;
if (ipc->disable_ipc_tx || sdev->fw_state != SOF_FW_BOOT_COMPLETE)
return -ENODEV;
/*
* The spin-lock is needed to protect message objects against other
* atomic contexts.
*/
spin_lock_irq(&sdev->ipc_lock);
/* initialise the message */
msg = &ipc->msg;
/* attach message data */
msg->msg_data = msg_data;
msg->msg_size = msg_bytes;
msg->reply_size = reply_bytes;
msg->reply_error = 0;
sdev->msg = msg;
ret = snd_sof_dsp_send_msg(sdev, msg);
/* Next reply that we receive will be related to this message */
if (!ret)
msg->ipc_complete = false;
spin_unlock_irq(&sdev->ipc_lock);
return ret;
}
/* send IPC message from host to DSP */
int sof_ipc_tx_message(struct snd_sof_ipc *ipc, void *msg_data, size_t msg_bytes,
void *reply_data, size_t reply_bytes)
{
if (msg_bytes > ipc->max_payload_size ||
reply_bytes > ipc->max_payload_size)
return -ENOBUFS;
return ipc->ops->tx_msg(ipc->sdev, msg_data, msg_bytes, reply_data,
reply_bytes, false);
}
EXPORT_SYMBOL(sof_ipc_tx_message);
/*
* send IPC message from host to DSP without modifying the DSP state.
* This will be used for IPC's that can be handled by the DSP
* even in a low-power D0 substate.
*/
int sof_ipc_tx_message_no_pm(struct snd_sof_ipc *ipc, void *msg_data, size_t msg_bytes,
void *reply_data, size_t reply_bytes)
{
if (msg_bytes > ipc->max_payload_size ||
reply_bytes > ipc->max_payload_size)
return -ENOBUFS;
return ipc->ops->tx_msg(ipc->sdev, msg_data, msg_bytes, reply_data,
reply_bytes, true);
}
EXPORT_SYMBOL(sof_ipc_tx_message_no_pm);
/* Generic helper function to retrieve the reply */
void snd_sof_ipc_get_reply(struct snd_sof_dev *sdev)
{
/*
* Sometimes, there is unexpected reply ipc arriving. The reply
* ipc belongs to none of the ipcs sent from driver.
* In this case, the driver must ignore the ipc.
*/
if (!sdev->msg) {
dev_warn(sdev->dev, "unexpected ipc interrupt raised!\n");
return;
}
sdev->msg->reply_error = sdev->ipc->ops->get_reply(sdev);
}
EXPORT_SYMBOL(snd_sof_ipc_get_reply);
/* handle reply message from DSP */
void snd_sof_ipc_reply(struct snd_sof_dev *sdev, u32 msg_id)
{
struct snd_sof_ipc_msg *msg = &sdev->ipc->msg;
if (msg->ipc_complete) {
dev_dbg(sdev->dev,
"no reply expected, received 0x%x, will be ignored",
msg_id);
return;
}
/* wake up and return the error if we have waiters on this message ? */
msg->ipc_complete = true;
wake_up(&msg->waitq);
}
EXPORT_SYMBOL(snd_sof_ipc_reply);
struct snd_sof_ipc *snd_sof_ipc_init(struct snd_sof_dev *sdev)
{
struct snd_sof_ipc *ipc;
struct snd_sof_ipc_msg *msg;
const struct sof_ipc_ops *ops;
ipc = devm_kzalloc(sdev->dev, sizeof(*ipc), GFP_KERNEL);
if (!ipc)
return NULL;
mutex_init(&ipc->tx_mutex);
ipc->sdev = sdev;
msg = &ipc->msg;
/* indicate that we aren't sending a message ATM */
msg->ipc_complete = true;
init_waitqueue_head(&msg->waitq);
/*
* Use IPC3 ops as it is the only available version now. With the addition of new IPC
* versions, this will need to be modified to use the selected version at runtime.
*/
ipc->ops = &ipc3_ops;
ops = ipc->ops;
/* check for mandatory ops */
if (!ops->tx_msg || !ops->rx_msg || !ops->set_get_data || !ops->get_reply) {
dev_err(sdev->dev, "Missing IPC message handling ops\n");
return NULL;
}
if (!ops->fw_loader || !ops->fw_loader->validate ||
!ops->fw_loader->parse_ext_manifest) {
dev_err(sdev->dev, "Missing IPC firmware loading ops\n");
return NULL;
}
if (!ops->pcm) {
dev_err(sdev->dev, "Missing IPC PCM ops\n");
return NULL;
}
if (!ops->tplg || !ops->tplg->widget || !ops->tplg->control) {
dev_err(sdev->dev, "Missing IPC topology ops\n");
return NULL;
}
if (ops->fw_tracing && (!ops->fw_tracing->init || !ops->fw_tracing->suspend ||
!ops->fw_tracing->resume)) {
dev_err(sdev->dev, "Missing firmware tracing ops\n");
return NULL;
}
return ipc;
}
EXPORT_SYMBOL(snd_sof_ipc_init);
void snd_sof_ipc_free(struct snd_sof_dev *sdev)
{
struct snd_sof_ipc *ipc = sdev->ipc;
if (!ipc)
return;
/* disable sending of ipc's */
mutex_lock(&ipc->tx_mutex);
ipc->disable_ipc_tx = true;
mutex_unlock(&ipc->tx_mutex);
}
EXPORT_SYMBOL(snd_sof_ipc_free);
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