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mailbox: arm_mhuv2: Add driver 

This adds driver for the ARM MHUv2 (Message Handling Unit) mailbox
controller.

This is based on the accepted DT bindings of the controller and supports
combination of both transport protocols, i.e. doorbell and data-transfer.

Transmitting and receiving data through the mailbox framework is done
through struct arm_mhuv2_mbox_msg.

Based on the initial work done by Morten Borup Petersen from ARM.

Co-developed-by: Tushar Khandelwal <tushar.khandelwal@arm.com>
Signed-off-by: Tushar Khandelwal <tushar.khandelwal@arm.com>
Tested-by: Usama Arif <usama.arif@arm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
This commit is contained in:
Viresh Kumar 2020-11-17 15:32:06 +05:30 committed by Jassi Brar
parent aa80be5043
commit 5a6338cce9
5 changed files with 1174 additions and 0 deletions
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9
MAINTAINERS
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@ -10418,6 +10418,15 @@ F: drivers/mailbox/
F: include/linux/mailbox_client.h
F: include/linux/mailbox_controller.h
MAILBOX ARM MHUv2
M: Viresh Kumar <viresh.kumar@linaro.org>
M: Tushar Khandelwal <Tushar.Khandelwal@arm.com>
L: linux-kernel@vger.kernel.org
S: Maintained
F: drivers/mailbox/arm_mhuv2.c
F: include/linux/mailbox/arm_mhuv2_message.h
F: Documentation/devicetree/bindings/mailbox/arm,mhuv2.yaml
MAN-PAGES: MANUAL PAGES FOR LINUX -- Sections 2, 3, 4, 5, and 7
M: Michael Kerrisk <mtk.manpages@gmail.com>
L: linux-man@vger.kernel.org

7
drivers/mailbox/Kconfig
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@ -16,6 +16,13 @@ config ARM_MHU
The controller has 3 mailbox channels, the last of which can be
used in Secure mode only.
config ARM_MHU_V2
tristate "ARM MHUv2 Mailbox"
depends on ARM_AMBA
help
Say Y here if you want to build the ARM MHUv2 controller driver,
which provides unidirectional mailboxes between processing elements.
config IMX_MBOX
tristate "i.MX Mailbox"
depends on ARCH_MXC || COMPILE_TEST

2
drivers/mailbox/Makefile
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@ -7,6 +7,8 @@ obj-$(CONFIG_MAILBOX_TEST) += mailbox-test.o
obj-$(CONFIG_ARM_MHU) += arm_mhu.o arm_mhu_db.o
obj-$(CONFIG_ARM_MHU_V2) += arm_mhuv2.o
obj-$(CONFIG_IMX_MBOX) += imx-mailbox.o
obj-$(CONFIG_ARMADA_37XX_RWTM_MBOX) += armada-37xx-rwtm-mailbox.o

1136
drivers/mailbox/arm_mhuv2.c Normal file
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20
include/linux/mailbox/arm_mhuv2_message.h Normal file
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@ -0,0 +1,20 @@
// SPDX-License-Identifier: GPL-2.0
/*
* ARM MHUv2 Mailbox Message
*
* Copyright (C) 2020 Arm Ltd.
* Copyright (C) 2020 Linaro Ltd.
*/
#ifndef _LINUX_ARM_MHUV2_MESSAGE_H_
#define _LINUX_ARM_MHUV2_MESSAGE_H_
#include <linux/types.h>
/* Data structure for data-transfer protocol */
struct arm_mhuv2_mbox_msg {
void *data;
size_t len;
};
#endif /* _LINUX_ARM_MHUV2_MESSAGE_H_ */