Hi Matthias,

Would you please take a look at it?

Thanks a lot, Allen

On Thu, 2022-04-07 at 21:03 +0800, Allen-KH Cheng wrote:

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.

Signed-off-by: Allen-KH Cheng allen-kh.cheng@mediatek.com 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 Reviewed-by: AngeloGioacchino Del Regno < angelogioacchino.delregno@collabora.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 | 161 ++++++++++++++++++ .../linux/firmware/mediatek/mtk-adsp-ipc.h | 65 +++++++ 6 files changed, 239 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 e5cfb01353d8..605ae3f47adc 100644 --- a/drivers/firmware/Kconfig +++ b/drivers/firmware/Kconfig @@ -300,6 +300,7 @@ 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..87cee61dbf32 --- /dev/null +++ b/drivers/firmware/mediatek/mtk-adsp-ipc.c @@ -0,0 +1,161 @@ +// 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"); +MODULE_LICENSE("GPL"); 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 */