[PATCH v5 1/1] firmware: mediatek: add adsp ipc protocol interface

[allen-kh.cheng <allen-kh.cheng@mediatek.com>]

From: Allen-KH Cheng <Allen-KH.Cheng@mediatek.com>

Some of mediatek processors contain
the Tensilica HiFix DSP for audio processing.

The communication between Host CPU and DSP firmware is
taking place using a shared memory area for message passing.

ADSP IPC protocol offers (send/recv) interfaces using
mediatek-mailbox APIs.

We use two mbox channels to implement a request-reply protocol.

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Curtis Malainey <cujomalainey@chromium.org>
Reviewed-by: Tzung-Bi Shih <tzungbi@google.com>
Reviewed-by: YC Hung <yc.hung@mediatek.com>
Signed-off-by: Allen-KH Cheng <Allen-KH.Cheng@mediatek.com>
---
 drivers/firmware/Kconfig                      |   1 +
 drivers/firmware/Makefile                     |   1 +
 drivers/firmware/mediatek/Kconfig             |   9 +
 drivers/firmware/mediatek/Makefile            |   2 +
 drivers/firmware/mediatek/mtk-adsp-ipc.c      | 160 ++++++++++++++++++
 .../linux/firmware/mediatek/mtk-adsp-ipc.h    |  65 +++++++
 6 files changed, 238 insertions(+)
 create mode 100644 drivers/firmware/mediatek/Kconfig
 create mode 100644 drivers/firmware/mediatek/Makefile
 create mode 100644 drivers/firmware/mediatek/mtk-adsp-ipc.c
 create mode 100644 include/linux/firmware/mediatek/mtk-adsp-ipc.h

diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 75cb91055c17..f3578c60cff0 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -299,6 +299,7 @@ source "drivers/firmware/cirrus/Kconfig"
 source "drivers/firmware/google/Kconfig"
 source "drivers/firmware/efi/Kconfig"
 source "drivers/firmware/imx/Kconfig"
+source "drivers/firmware/mediatek/Kconfig"
 source "drivers/firmware/meson/Kconfig"
 source "drivers/firmware/psci/Kconfig"
 source "drivers/firmware/smccc/Kconfig"
diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile
index 4e58cb474a68..88fbdc110100 100644
--- a/drivers/firmware/Makefile
+++ b/drivers/firmware/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_GOOGLE_FIRMWARE)	+= google/
 obj-$(CONFIG_EFI)		+= efi/
 obj-$(CONFIG_UEFI_CPER)		+= efi/
 obj-y				+= imx/
+obj-y				+= mediatek/
 obj-y				+= psci/
 obj-y				+= smccc/
 obj-y				+= tegra/
diff --git a/drivers/firmware/mediatek/Kconfig b/drivers/firmware/mediatek/Kconfig
new file mode 100644
index 000000000000..6d1e580b967b
--- /dev/null
+++ b/drivers/firmware/mediatek/Kconfig
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config MTK_ADSP_IPC
+	tristate "MTK ADSP IPC Protocol driver"
+	depends on MTK_ADSP_MBOX
+	help
+	  Say yes here to add support for the MediaTek ADSP IPC
+	  between host AP (Linux) and the firmware running on ADSP.
+	  ADSP exists on some mtk processors.
+	  Client might use shared memory to exchange information with ADSP side.
diff --git a/drivers/firmware/mediatek/Makefile b/drivers/firmware/mediatek/Makefile
new file mode 100644
index 000000000000..4e840b65650d
--- /dev/null
+++ b/drivers/firmware/mediatek/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_MTK_ADSP_IPC)		+= mtk-adsp-ipc.o
diff --git a/drivers/firmware/mediatek/mtk-adsp-ipc.c b/drivers/firmware/mediatek/mtk-adsp-ipc.c
new file mode 100644
index 000000000000..683742435d26
--- /dev/null
+++ b/drivers/firmware/mediatek/mtk-adsp-ipc.c
@@ -0,0 +1,160 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2022 MediaTek Corporation. All rights reserved.
+ * Author: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
+ */
+
+#include <linux/firmware/mediatek/mtk-adsp-ipc.h>
+#include <linux/kernel.h>
+#include <linux/mailbox_client.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/*
+ * mtk_adsp_ipc_send - send ipc cmd to MTK ADSP
+ *
+ * @ipc: ADSP IPC handle
+ * @idx: index of the mailbox channel
+ * @msg: IPC cmd (reply or request)
+ *
+ * Returns zero for success from mbox_send_message
+ * negative value for error
+ */
+int mtk_adsp_ipc_send(struct mtk_adsp_ipc *ipc, unsigned int idx, uint32_t msg)
+{
+	struct mtk_adsp_chan *adsp_chan;
+	int ret;
+
+	if (idx >= MTK_ADSP_MBOX_NUM)
+		return -EINVAL;
+
+	adsp_chan = &ipc->chans[idx];
+	ret = mbox_send_message(adsp_chan->ch, &msg);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * mbox_send_message returns non-negative value on success,
+	 * return zero for success
+	 */
+	return 0;
+}
+EXPORT_SYMBOL(mtk_adsp_ipc_send);
+
+/*
+ * mtk_adsp_ipc_recv - recv callback used by MTK ADSP mailbox
+ *
+ * @c: mbox client
+ * @msg: message received
+ *
+ * Users of ADSP IPC will need to privde handle_reply and handle_request
+ * callbacks.
+ */
+static void mtk_adsp_ipc_recv(struct mbox_client *c, void *msg)
+{
+	struct mtk_adsp_chan *chan = container_of(c, struct mtk_adsp_chan, cl);
+	struct device *dev = c->dev;
+
+	switch (chan->idx) {
+	case MTK_ADSP_MBOX_REPLY:
+		chan->ipc->ops->handle_reply(chan->ipc);
+		break;
+	case MTK_ADSP_MBOX_REQUEST:
+		chan->ipc->ops->handle_request(chan->ipc);
+		break;
+	default:
+		dev_err(dev, "wrong mbox chan %d\n", chan->idx);
+		break;
+	}
+}
+
+static int mtk_adsp_ipc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mtk_adsp_ipc *adsp_ipc;
+	struct mtk_adsp_chan *adsp_chan;
+	struct mbox_client *cl;
+	char *chan_name;
+	int ret;
+	int i, j;
+
+	device_set_of_node_from_dev(&pdev->dev, pdev->dev.parent);
+
+	adsp_ipc = devm_kzalloc(dev, sizeof(*adsp_ipc), GFP_KERNEL);
+	if (!adsp_ipc)
+		return -ENOMEM;
+
+	for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
+		chan_name = kasprintf(GFP_KERNEL, "mbox%d", i);
+		if (!chan_name) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		adsp_chan = &adsp_ipc->chans[i];
+		cl = &adsp_chan->cl;
+		cl->dev = dev->parent;
+		cl->tx_block = false;
+		cl->knows_txdone = false;
+		cl->tx_prepare = NULL;
+		cl->rx_callback = mtk_adsp_ipc_recv;
+
+		adsp_chan->ipc = adsp_ipc;
+		adsp_chan->idx = i;
+		adsp_chan->ch = mbox_request_channel_byname(cl, chan_name);
+		if (IS_ERR(adsp_chan->ch)) {
+			ret = PTR_ERR(adsp_chan->ch);
+			if (ret != -EPROBE_DEFER)
+				dev_err(dev, "Failed to request mbox chan %d ret %d\n",
+					i, ret);
+			goto out_free;
+		}
+
+		dev_dbg(dev, "request mbox chan %s\n", chan_name);
+		kfree(chan_name);
+	}
+
+	adsp_ipc->dev = dev;
+	dev_set_drvdata(dev, adsp_ipc);
+	dev_dbg(dev, "MTK ADSP IPC initialized\n");
+
+	return 0;
+
+out_free:
+	kfree(chan_name);
+out:
+	for (j = 0; j < i; j++) {
+		adsp_chan = &adsp_ipc->chans[j];
+		mbox_free_channel(adsp_chan->ch);
+	}
+
+	return ret;
+}
+
+static int mtk_adsp_ipc_remove(struct platform_device *pdev)
+{
+	struct mtk_adsp_ipc *adsp_ipc = dev_get_drvdata(&pdev->dev);
+	struct mtk_adsp_chan *adsp_chan;
+	int i;
+
+	for (i = 0; i < MTK_ADSP_MBOX_NUM; i++) {
+		adsp_chan = &adsp_ipc->chans[i];
+		mbox_free_channel(adsp_chan->ch);
+	}
+
+	return 0;
+}
+
+static struct platform_driver mtk_adsp_ipc_driver = {
+	.driver = {
+		.name = "mtk-adsp-ipc",
+	},
+	.probe = mtk_adsp_ipc_probe,
+	.remove = mtk_adsp_ipc_remove,
+};
+builtin_platform_driver(mtk_adsp_ipc_driver);
+
+MODULE_AUTHOR("Allen-KH Cheng <allen-kh.cheng@mediatek.com>");
+MODULE_DESCRIPTION("MTK ADSP IPC Driver");
diff --git a/include/linux/firmware/mediatek/mtk-adsp-ipc.h b/include/linux/firmware/mediatek/mtk-adsp-ipc.h
new file mode 100644
index 000000000000..28fd313340b8
--- /dev/null
+++ b/include/linux/firmware/mediatek/mtk-adsp-ipc.h
@@ -0,0 +1,65 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2022 MediaTek Inc.
+ */
+
+#ifndef MTK_ADSP_IPC_H
+#define MTK_ADSP_IPC_H
+
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/mailbox_controller.h>
+#include <linux/mailbox_client.h>
+
+#define MTK_ADSP_IPC_REQ 0
+#define MTK_ADSP_IPC_RSP 1
+#define MTK_ADSP_IPC_OP_REQ 0x1
+#define MTK_ADSP_IPC_OP_RSP 0x2
+
+enum {
+	MTK_ADSP_MBOX_REPLY,
+	MTK_ADSP_MBOX_REQUEST,
+	MTK_ADSP_MBOX_NUM,
+};
+
+struct mtk_adsp_ipc;
+
+struct mtk_adsp_ipc_ops {
+	void (*handle_reply)(struct mtk_adsp_ipc *ipc);
+	void (*handle_request)(struct mtk_adsp_ipc *ipc);
+};
+
+struct mtk_adsp_chan {
+	struct mtk_adsp_ipc *ipc;
+	struct mbox_client cl;
+	struct mbox_chan *ch;
+	char *name;
+	int idx;
+};
+
+struct mtk_adsp_ipc {
+	struct mtk_adsp_chan chans[MTK_ADSP_MBOX_NUM];
+	struct device *dev;
+	struct mtk_adsp_ipc_ops *ops;
+	void *private_data;
+};
+
+static inline void mtk_adsp_ipc_set_data(struct mtk_adsp_ipc *ipc, void *data)
+{
+	if (!ipc)
+		return;
+
+	ipc->private_data = data;
+}
+
+static inline void *mtk_adsp_ipc_get_data(struct mtk_adsp_ipc *ipc)
+{
+	if (!ipc)
+		return NULL;
+
+	return ipc->private_data;
+}
+
+int mtk_adsp_ipc_send(struct mtk_adsp_ipc *ipc, unsigned int idx, uint32_t op);
+
+#endif /* MTK_ADSP_IPC_H */
-- 
2.18.0


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