// SPDX-License-Identifier: (GPL-2.0 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.
//
// Authors: Liam Girdwood <liam.r.girdwood@linux.intel.com>
// Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
// Rander Wang <rander.wang@intel.com>
// Keyon Jie <yang.jie@linux.intel.com>
//
/*
* Hardware interface for generic Intel audio DSP HDA IP
*/
#include "../ops.h"
#include "hda.h"
static void hda_dsp_ipc_host_done(struct snd_sof_dev *sdev)
{
/*
* tell DSP cmd is done - clear busy
* interrupt and send reply msg to dsp
*/
snd_sof_dsp_update_bits_forced(sdev, HDA_DSP_BAR,
HDA_DSP_REG_HIPCT,
HDA_DSP_REG_HIPCT_BUSY,
HDA_DSP_REG_HIPCT_BUSY);
/* unmask BUSY interrupt */
snd_sof_dsp_update_bits(sdev, HDA_DSP_BAR,
HDA_DSP_REG_HIPCCTL,
HDA_DSP_REG_HIPCCTL_BUSY,
HDA_DSP_REG_HIPCCTL_BUSY);
}
static void hda_dsp_ipc_dsp_done(struct snd_sof_dev *sdev)
{
/*
* set DONE bit - tell DSP we have received the reply msg
* from DSP, and processed it, don't send more reply to host
*/
snd_sof_dsp_update_bits_forced(sdev, HDA_DSP_BAR,
HDA_DSP_REG_HIPCIE,
HDA_DSP_REG_HIPCIE_DONE,
HDA_DSP_REG_HIPCIE_DONE);
/* unmask Done interrupt */
snd_sof_dsp_update_bits(sdev, HDA_DSP_BAR,
HDA_DSP_REG_HIPCCTL,
HDA_DSP_REG_HIPCCTL_DONE,
HDA_DSP_REG_HIPCCTL_DONE);
}
int hda_dsp_ipc_send_msg(struct snd_sof_dev *sdev, struct snd_sof_ipc_msg *msg)
{
/* send IPC message to DSP */
sof_mailbox_write(sdev, sdev->host_box.offset, msg->msg_data,
msg->msg_size);
snd_sof_dsp_write(sdev, HDA_DSP_BAR, HDA_DSP_REG_HIPCI,
HDA_DSP_REG_HIPCI_BUSY);
return 0;
}
void hda_dsp_ipc_get_reply(struct snd_sof_dev *sdev)
{
struct snd_sof_ipc_msg *msg = sdev->msg;
struct sof_ipc_reply reply;
struct sof_ipc_cmd_hdr *hdr;
int ret = 0;
/*
* 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 (!msg) {
dev_warn(sdev->dev, "unexpected ipc interrupt raised!\n");
return;
}
hdr = msg->msg_data;
if (hdr->cmd == (SOF_IPC_GLB_PM_MSG | SOF_IPC_PM_CTX_SAVE)) {
/*
* memory windows are powered off before sending IPC reply,
* so we can't read the mailbox for CTX_SAVE reply.
*/
reply.error = 0;
reply.hdr.cmd = SOF_IPC_GLB_REPLY;
reply.hdr.size = sizeof(reply);
memcpy(msg->reply_data, &reply, sizeof(reply));
goto out;
}
/* get IPC reply from DSP in the mailbox */
sof_mailbox_read(sdev, sdev->host_box.offset, &reply,
sizeof(reply));
if (reply.error < 0) {
memcpy(msg->reply_data, &reply, sizeof(reply));
ret = reply.error;
} else {
/* reply correct size ? */
if (reply.hdr.size != msg->reply_size) {
dev_err(sdev->dev, "error: reply expected %zu got %u bytes\n",
msg->reply_size, reply.hdr.size);
ret = -EINVAL;
}
/* read the message */
if (msg->reply_size > 0)
sof_mailbox_read(sdev, sdev->host_box.offset,
msg->reply_data, msg->reply_size);
}
out:
msg->reply_error = ret;
}
static bool hda_dsp_ipc_is_sof(uint32_t msg)
{
return (msg & (HDA_DSP_IPC_PURGE_FW | 0xf << 9)) != msg ||
(msg & HDA_DSP_IPC_PURGE_FW) != HDA_DSP_IPC_PURGE_FW;
}
/* IPC handler thread */
irqreturn_t hda_dsp_ipc_irq_thread(int irq, void *context)
{
struct snd_sof_dev *sdev = context;
u32 hipci;
u32 hipcie;
u32 hipct;
u32 hipcte;
u32 msg;
u32 msg_ext;
bool ipc_irq = false;
/* read IPC status */
hipcie = snd_sof_dsp_read(sdev, HDA_DSP_BAR,
HDA_DSP_REG_HIPCIE);
hipct = snd_sof_dsp_read(sdev, HDA_DSP_BAR, HDA_DSP_REG_HIPCT);
hipci = snd_sof_dsp_read(sdev, HDA_DSP_BAR, HDA_DSP_REG_HIPCI);
hipcte = snd_sof_dsp_read(sdev, HDA_DSP_BAR, HDA_DSP_REG_HIPCTE);
/* is this a reply message from the DSP */
if (hipcie & HDA_DSP_REG_HIPCIE_DONE) {
msg = hipci & HDA_DSP_REG_HIPCI_MSG_MASK;
msg_ext = hipcie & HDA_DSP_REG_HIPCIE_MSG_MASK;
dev_vdbg(sdev->dev,
"ipc: firmware response, msg:0x%x, msg_ext:0x%x\n",
msg, msg_ext);
/* mask Done interrupt */
snd_sof_dsp_update_bits(sdev, HDA_DSP_BAR,
HDA_DSP_REG_HIPCCTL,
HDA_DSP_REG_HIPCCTL_DONE, 0);
/*
* Make sure the interrupt thread cannot be preempted between
* waking up the sender and re-enabling the interrupt. Also
* protect against a theoretical race with sof_ipc_tx_message():
* if the DSP is fast enough to receive an IPC message, reply to
* it, and the host interrupt processing calls this function on
* a different core from the one, where the sending is taking
* place, the message might not yet be marked as expecting a
* reply.
*/
spin_lock_irq(&sdev->ipc_lock);
/* handle immediate reply from DSP core - ignore ROM messages */
if (hda_dsp_ipc_is_sof(msg)) {
hda_dsp_ipc_get_reply(sdev);
snd_sof_ipc_reply(sdev, msg);
}
/* wake up sleeper if we are loading code */
if (sdev->code_loading) {
sdev->code_loading = 0;
wake_up(&sdev->waitq);
}
/* set the done bit */
hda_dsp_ipc_dsp_done(sdev);
spin_unlock_irq(&sdev->ipc_lock);
ipc_irq = true;
}
/* is this a new message from DSP */
if (hipct & HDA_DSP_REG_HIPCT_BUSY) {
msg = hipct & HDA_DSP_REG_HIPCT_MSG_MASK;
msg_ext = hipcte & HDA_DSP_REG_HIPCTE_MSG_MASK;
dev_vdbg(sdev->dev,
"ipc: firmware initiated, msg:0x%x, msg_ext:0x%x\n",
msg, msg_ext);
/* mask BUSY interrupt */
snd_sof_dsp_update_bits(sdev, HDA_DSP_BAR,
HDA_DSP_REG_HIPCCTL,
HDA_DSP_REG_HIPCCTL_BUSY, 0);
/* handle messages from DSP */
if ((hipct & SOF_IPC_PANIC_MAGIC_MASK) == SOF_IPC_PANIC_MAGIC) {
/* this is a PANIC message !! */
snd_sof_dsp_panic(sdev, HDA_DSP_PANIC_OFFSET(msg_ext));
} else {
/* normal message - process normally */
snd_sof_ipc_msgs_rx(sdev);
}
hda_dsp_ipc_host_done(sdev);
ipc_irq = true;
}
if (!ipc_irq) {
/*
* This interrupt is not shared so no need to return IRQ_NONE.
*/
dev_dbg_ratelimited(sdev->dev,
"nothing to do in IPC IRQ thread\n");
}
/* re-enable IPC interrupt */
snd_sof_dsp_update_bits(sdev, HDA_DSP_BAR, HDA_DSP_REG_ADSPIC,
HDA_DSP_ADSPIC_IPC, HDA_DSP_ADSPIC_IPC);
return IRQ_HANDLED;
}
/* is this IRQ for ADSP ? - we only care about IPC here */
irqreturn_t hda_dsp_ipc_irq_handler(int irq, void *context)
{
struct snd_sof_dev *sdev = context;
int ret = IRQ_NONE;
u32 irq_status;
spin_lock(&sdev->hw_lock);
/* store status */
irq_status = snd_sof_dsp_read(sdev, HDA_DSP_BAR, HDA_DSP_REG_ADSPIS);
dev_vdbg(sdev->dev, "irq handler: irq_status:0x%x\n", irq_status);
/* invalid message ? */
if (irq_status == 0xffffffff)
goto out;
/* IPC message ? */
if (irq_status & HDA_DSP_ADSPIS_IPC) {
/* disable IPC interrupt */
snd_sof_dsp_update_bits_unlocked(sdev, HDA_DSP_BAR,
HDA_DSP_REG_ADSPIC,
HDA_DSP_ADSPIC_IPC, 0);
ret = IRQ_WAKE_THREAD;
}
out:
spin_unlock(&sdev->hw_lock);
return ret;
}
int hda_dsp_ipc_get_mailbox_offset(struct snd_sof_dev *sdev)
{
return HDA_DSP_MBOX_UPLINK_OFFSET;
}
int hda_dsp_ipc_get_window_offset(struct snd_sof_dev *sdev, u32 id)
{
return SRAM_WINDOW_OFFSET(id);
}
void hda_ipc_msg_data(struct snd_sof_dev *sdev,
struct snd_pcm_substream *substream,
void *p, size_t sz)
{
if (!substream || !sdev->stream_box.size) {
sof_mailbox_read(sdev, sdev->dsp_box.offset, p, sz);
} else {
struct hdac_stream *hstream = substream->runtime->private_data;
struct sof_intel_hda_stream *hda_stream;
hda_stream = container_of(hstream,
struct sof_intel_hda_stream,
hda_stream.hstream);
/* The stream might already be closed */
if (hstream)
sof_mailbox_read(sdev, hda_stream->stream.posn_offset,
p, sz);
}
}
int hda_ipc_pcm_params(struct snd_sof_dev *sdev,
struct snd_pcm_substream *substream,
const struct sof_ipc_pcm_params_reply *reply)
{
struct hdac_stream *hstream = substream->runtime->private_data;
struct sof_intel_hda_stream *hda_stream;
/* validate offset */
size_t posn_offset = reply->posn_offset;
hda_stream = container_of(hstream, struct sof_intel_hda_stream,
hda_stream.hstream);
/* check for unaligned offset or overflow */
if (posn_offset > sdev->stream_box.size ||
posn_offset % sizeof(struct sof_ipc_stream_posn) != 0)
return -EINVAL;
hda_stream->stream.posn_offset = sdev->stream_box.offset + posn_offset;
dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu",
substream->stream, hda_stream->stream.posn_offset);
return 0;
}