1 files changed, 216 insertions, 0 deletions
diff --git a/sound/soc/sof/amd/acp-ipc.c b/sound/soc/sof/amd/acp-ipc.c
new file mode 100644
index 000000000000..dd030566e372
--- /dev/null
+++ b/sound/soc/sof/amd/acp-ipc.c
@@ -0,0 +1,216 @@
+// 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 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 {
+		/* 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;
+	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;
+
+	if (sdev->first_boot && sdev->fw_state != SOF_FW_BOOT_COMPLETE) {
+		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) {
+		spin_lock_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);
+		spin_unlock_irq(&sdev->ipc_lock);
+		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_pcm_substream *substream,
+			 void *p, size_t sz)
+{
+	unsigned int offset = sdev->dsp_box.offset;
+
+	if (!substream || !sdev->stream_box.size)
+		acp_mailbox_read(sdev, offset, p, sz);
+
+	return 0;
+}
+EXPORT_SYMBOL_NS(acp_sof_ipc_msg_data, 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");