// 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) 2021, 2023 Advanced Micro Devices, Inc.
//
// Authors: Balakishore Pati <Balakishore.pati@amd.com>
//	    Ajit Kumar Pandey <AjitKumar.Pandey@amd.com>

/* ACP-specific SOF IPC code */

#include <linux/module.h>
#include "../ops.h"
#include "acp.h"
#include "acp-dsp-offset.h"

void acp_mailbox_write(struct snd_sof_dev *sdev, u32 offset, void *message, size_t bytes)
{
	memcpy_to_scratch(sdev, offset, message, bytes);
}
EXPORT_SYMBOL_NS(acp_mailbox_write, "SND_SOC_SOF_AMD_COMMON");

void acp_mailbox_read(struct snd_sof_dev *sdev, u32 offset, void *message, size_t bytes)
{
	memcpy_from_scratch(sdev, offset, message, bytes);
}
EXPORT_SYMBOL_NS(acp_mailbox_read, "SND_SOC_SOF_AMD_COMMON");

static void acpbus_trigger_host_to_dsp_swintr(struct acp_dev_data *adata)
{
	struct snd_sof_dev *sdev = adata->dev;
	const struct sof_amd_acp_desc *desc = get_chip_info(sdev->pdata);
	u32 swintr_trigger;

	swintr_trigger = snd_sof_dsp_read(sdev, ACP_DSP_BAR, desc->dsp_intr_base +
						DSP_SW_INTR_TRIG_OFFSET);
	swintr_trigger |= 0x01;
	snd_sof_dsp_write(sdev, ACP_DSP_BAR, desc->dsp_intr_base + DSP_SW_INTR_TRIG_OFFSET,
			  swintr_trigger);
}

static void acp_ipc_host_msg_set(struct snd_sof_dev *sdev)
{
	unsigned int host_msg = sdev->debug_box.offset +
				offsetof(struct scratch_ipc_conf, sof_host_msg_write);

	snd_sof_dsp_write(sdev, ACP_DSP_BAR, ACP_SCRATCH_REG_0 + host_msg, 1);
}

static void acp_dsp_ipc_host_done(struct snd_sof_dev *sdev)
{
	unsigned int dsp_msg = sdev->debug_box.offset +
			       offsetof(struct scratch_ipc_conf, sof_dsp_msg_write);

	snd_sof_dsp_write(sdev, ACP_DSP_BAR, ACP_SCRATCH_REG_0 + dsp_msg, 0);
}

static void acp_dsp_ipc_dsp_done(struct snd_sof_dev *sdev)
{
	unsigned int dsp_ack = sdev->debug_box.offset +
			       offsetof(struct scratch_ipc_conf, sof_dsp_ack_write);

	snd_sof_dsp_write(sdev, ACP_DSP_BAR, ACP_SCRATCH_REG_0 + dsp_ack, 0);
}

int acp_sof_ipc_send_msg(struct snd_sof_dev *sdev, struct snd_sof_ipc_msg *msg)
{
	struct acp_dev_data *adata = sdev->pdata->hw_pdata;
	const struct sof_amd_acp_desc *desc = get_chip_info(sdev->pdata);
	unsigned int offset = sdev->host_box.offset;
	unsigned int count = ACP_HW_SEM_RETRY_COUNT;

	while (snd_sof_dsp_read(sdev, ACP_DSP_BAR, desc->hw_semaphore_offset)) {
		/* Wait until acquired HW Semaphore Lock or timeout*/
		count--;
		if (!count) {
			dev_err(sdev->dev, "%s: Failed to acquire HW lock\n", __func__);
			return -EINVAL;
		}
	}

	acp_mailbox_write(sdev, offset, msg->msg_data, msg->msg_size);
	acp_ipc_host_msg_set(sdev);

	/* Trigger host to dsp interrupt for the msg */
	acpbus_trigger_host_to_dsp_swintr(adata);

	/* Unlock or Release HW Semaphore */
	snd_sof_dsp_write(sdev, ACP_DSP_BAR, desc->hw_semaphore_offset, 0x0);

	return 0;
}
EXPORT_SYMBOL_NS(acp_sof_ipc_send_msg, "SND_SOC_SOF_AMD_COMMON");

static void acp_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;
	unsigned int offset = sdev->host_box.offset;
	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) ||
	    hdr->cmd == (SOF_IPC_GLB_PM_MSG | SOF_IPC_PM_GATE)) {
		/*
		 * memory windows are powered off before sending IPC reply,
		 * so we can't read the mailbox for CTX_SAVE and PM_GATE
		 * replies.
		 */
		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 */
	acp_mailbox_read(sdev, offset, &reply, sizeof(reply));
	if (reply.error < 0) {
		memcpy(msg->reply_data, &reply, sizeof(reply));
		ret = reply.error;
	} else {
		/*
		 * To support an IPC tx_message with a
		 * reply_size set to zero.
		 */
		if (!msg->reply_size)
			goto out;

		/* reply correct size ? */
		if (reply.hdr.size != msg->reply_size &&
		    !(reply.hdr.cmd & SOF_IPC_GLB_PROBE)) {
			dev_err(sdev->dev, "reply expected %zu got %u bytes\n",
				msg->reply_size, reply.hdr.size);
			ret = -EINVAL;
		}
		/* read the message */
		if (msg->reply_size > 0)
			acp_mailbox_read(sdev, offset, msg->reply_data, msg->reply_size);
	}
out:
	msg->reply_error = ret;
}

irqreturn_t acp_sof_ipc_irq_thread(int irq, void *context)
{
	struct snd_sof_dev *sdev = context;
	const struct sof_amd_acp_desc *desc = get_chip_info(sdev->pdata);
	struct acp_dev_data *adata = sdev->pdata->hw_pdata;
	unsigned int dsp_msg_write = sdev->debug_box.offset +
				     offsetof(struct scratch_ipc_conf, sof_dsp_msg_write);
	unsigned int dsp_ack_write = sdev->debug_box.offset +
				     offsetof(struct scratch_ipc_conf, sof_dsp_ack_write);
	bool ipc_irq = false;
	int dsp_msg, dsp_ack;
	unsigned int status;

	if (unlikely(sdev->first_boot && sdev->fw_state != SOF_FW_BOOT_COMPLETE)) {
		acp_mailbox_read(sdev, sdev->dsp_box.offset, &status, sizeof(status));

		if ((status & SOF_IPC_PANIC_MAGIC_MASK) == SOF_IPC_PANIC_MAGIC) {
			snd_sof_dsp_panic(sdev, sdev->dsp_box.offset + sizeof(status),
					  true);
			status = 0;
			acp_mailbox_write(sdev, sdev->dsp_box.offset, &status, sizeof(status));
			return IRQ_HANDLED;
		}
		snd_sof_ipc_msgs_rx(sdev);
		acp_dsp_ipc_host_done(sdev);
		return IRQ_HANDLED;
	}

	dsp_msg = snd_sof_dsp_read(sdev, ACP_DSP_BAR, ACP_SCRATCH_REG_0 + dsp_msg_write);
	if (dsp_msg) {
		snd_sof_ipc_msgs_rx(sdev);
		acp_dsp_ipc_host_done(sdev);
		ipc_irq = true;
	}

	dsp_ack = snd_sof_dsp_read(sdev, ACP_DSP_BAR, ACP_SCRATCH_REG_0 + dsp_ack_write);
	if (dsp_ack) {
		if (likely(sdev->fw_state == SOF_FW_BOOT_COMPLETE)) {
			guard(spinlock_irq)(&sdev->ipc_lock);

			/* handle immediate reply from DSP core */
			acp_dsp_ipc_get_reply(sdev);
			snd_sof_ipc_reply(sdev, 0);
			/* set the done bit */
			acp_dsp_ipc_dsp_done(sdev);
		} else {
			dev_dbg_ratelimited(sdev->dev, "IPC reply before FW_BOOT_COMPLETE: %#x\n",
					    dsp_ack);
		}

		ipc_irq = true;
	}

	acp_mailbox_read(sdev, sdev->debug_box.offset, &status, sizeof(u32));
	if ((status & SOF_IPC_PANIC_MAGIC_MASK) == SOF_IPC_PANIC_MAGIC) {
		snd_sof_dsp_panic(sdev, sdev->dsp_oops_offset, true);
		status = 0;
		acp_mailbox_write(sdev, sdev->debug_box.offset, &status, sizeof(status));
		return IRQ_HANDLED;
	}

	if (desc->probe_reg_offset) {
		u32 val;
		u32 posn;

		/* Probe register consists of two parts
		 * (0-30) bit has cumulative position value
		 * 31 bit is a synchronization flag between DSP and CPU
		 * for the position update
		 */
		val = snd_sof_dsp_read(sdev, ACP_DSP_BAR, desc->probe_reg_offset);
		if (val & PROBE_STATUS_BIT) {
			posn = val & ~PROBE_STATUS_BIT;
			if (adata->probe_stream) {
				/* Probe related posn value is of 31 bits limited to 2GB
				 * once wrapped DSP won't send posn interrupt.
				 */
				adata->probe_stream->cstream_posn = posn;
				snd_compr_fragment_elapsed(adata->probe_stream->cstream);
				snd_sof_dsp_write(sdev, ACP_DSP_BAR, desc->probe_reg_offset, posn);
				ipc_irq = true;
			}
		}
	}

	if (!ipc_irq)
		dev_dbg_ratelimited(sdev->dev, "nothing to do in IPC IRQ thread\n");

	return IRQ_HANDLED;
}
EXPORT_SYMBOL_NS(acp_sof_ipc_irq_thread, "SND_SOC_SOF_AMD_COMMON");

int acp_sof_ipc_msg_data(struct snd_sof_dev *sdev, struct snd_sof_pcm_stream *sps,
			 void *p, size_t sz)
{
	unsigned int offset = sdev->dsp_box.offset;

	if (!sps || !sdev->stream_box.size) {
		acp_mailbox_read(sdev, offset, p, sz);
	} else {
		struct snd_pcm_substream *substream = sps->substream;
		struct acp_dsp_stream *stream;

		if (!substream || !substream->runtime)
			return -ESTRPIPE;

		stream = substream->runtime->private_data;

		if (!stream)
			return -ESTRPIPE;

		acp_mailbox_read(sdev, stream->posn_offset, p, sz);
	}

	return 0;
}
EXPORT_SYMBOL_NS(acp_sof_ipc_msg_data, "SND_SOC_SOF_AMD_COMMON");

int acp_set_stream_data_offset(struct snd_sof_dev *sdev,
			       struct snd_sof_pcm_stream *sps,
			       size_t posn_offset)
{
	struct snd_pcm_substream *substream = sps->substream;
	struct acp_dsp_stream *stream = substream->runtime->private_data;

	/* check for unaligned offset or overflow */
	if (posn_offset > sdev->stream_box.size ||
	    posn_offset % sizeof(struct sof_ipc_stream_posn) != 0)
		return -EINVAL;

	stream->posn_offset = sdev->stream_box.offset + posn_offset;

	dev_dbg(sdev->dev, "pcm: stream dir %d, posn mailbox offset is %zu",
		substream->stream, stream->posn_offset);

	return 0;
}
EXPORT_SYMBOL_NS(acp_set_stream_data_offset, "SND_SOC_SOF_AMD_COMMON");

int acp_sof_ipc_get_mailbox_offset(struct snd_sof_dev *sdev)
{
	const struct sof_amd_acp_desc *desc = get_chip_info(sdev->pdata);

	return desc->sram_pte_offset;
}
EXPORT_SYMBOL_NS(acp_sof_ipc_get_mailbox_offset, "SND_SOC_SOF_AMD_COMMON");

int acp_sof_ipc_get_window_offset(struct snd_sof_dev *sdev, u32 id)
{
	return 0;
}
EXPORT_SYMBOL_NS(acp_sof_ipc_get_window_offset, "SND_SOC_SOF_AMD_COMMON");

MODULE_DESCRIPTION("AMD ACP sof-ipc driver");
