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@xxxxxxxxxxxx>
>
> 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@xxxxxxxxxxxx>
> Reviewed-by: Pierre-Louis Bossart <
> pierre-louis.bossart@xxxxxxxxxxxxxxx>
> Reviewed-by: Curtis Malainey <cujomalainey@xxxxxxxxxxxx>
> Reviewed-by: Tzung-Bi Shih <tzungbi@xxxxxxxxxx>
> Reviewed-by: YC Hung <yc.hung@xxxxxxxxxxxx>
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@xxxxxxxxxxxxx>
> ---
> 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@xxxxxxxxxxxx>
> + */
> +
> +#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@xxxxxxxxxxxx>");
> +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 */
