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| author | Daniel Baluta <daniel.baluta@nxp.com> | 2019-08-01 12:56:36 +0300 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2019-08-12 16:19:25 +0300 |
| commit | ffbf23d50353915dc2622a3b7b4ddc678165f92d (patch) | |
| tree | 7659b89235051a65d0df50eec8d165e07baa017f /drivers/firmware/imx/Kconfig | |
| parent | 73feb4d0f8f14c5102bd46ce2255ff55d3d52db7 (diff) | |
| download | linux-ffbf23d50353915dc2622a3b7b4ddc678165f92d.tar.xz | |
firmware: imx: Add DSP IPC protocol interface
Some of i.MX8 processors (e.g i.MX8QM, i.MX8QXP) contain
the Tensilica HiFi4 DSP for advanced pre- and post-audio
processing.
The communication between Host CPU and DSP firmware is
taking place using a shared memory area for message passing
and a dedicated Messaging Unit for notifications.
DSP IPC protocol offers a doorbell interface using
imx-mailbox API.
We use 4 MU channels (2 x TXDB, 2 x RXDB) to implement a
request-reply protocol.
Connection 0 (txdb0, rxdb0):
- Host writes messasge to shared memory [SHMEM]
- Host sends a request [MU]
- DSP handles request [SHMEM]
- DSP sends reply [MU]
Connection 1 (txdb1, rxdb1):
- DSP writes a message to shared memory [SHMEM]
- DSP sends a request [MU]
- Host handles request [SHMEM]
- Host sends reply [MU]
The protocol interface will be used by a Host client to
communicate with the DSP. First client will be the i.MX8
part from Sound Open Firmware infrastructure.
The protocol offers the following interface:
On Tx:
- imx_dsp_ring_doorbell, will be called to notify the DSP
that it needs to handle a request.
On Rx:
- clients need to provide two callbacks:
.handle_reply
.handle_request
- the callbacks will be used by the protocol on
notification arrival from DSP.
Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'drivers/firmware/imx/Kconfig')
| -rw-r--r-- | drivers/firmware/imx/Kconfig | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/firmware/imx/Kconfig b/drivers/firmware/imx/Kconfig index 42b566f8903f..0dbee32da4c6 100644 --- a/drivers/firmware/imx/Kconfig +++ b/drivers/firmware/imx/Kconfig @@ -1,4 +1,15 @@ # SPDX-License-Identifier: GPL-2.0-only +config IMX_DSP + bool "IMX DSP Protocol driver" + depends on IMX_MBOX + help + This enables DSP IPC protocol between host AP (Linux) + and the firmware running on DSP. + DSP exists on some i.MX8 processors (e.g i.MX8QM, i.MX8QXP). + + It acts like a doorbell. Client might use shared memory to + exchange information with DSP side. + config IMX_SCU bool "IMX SCU Protocol driver" depends on IMX_MBOX |