mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-29 14:05:19 +08:00
58919326e7
Tegra234 supports sending/receiving 32-bit and 128-bit data over a shared mailbox. Based on the data size to be used, clients need to specify the type of shared mailbox in the device tree. Add a macro for 128-bit shared mailbox. Mailbox clients can use this macro as a flag in device tree to enable 128-bit data support for a shared mailbox. Signed-off-by: Kartik <kkartik@nvidia.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
124 lines
3.7 KiB
YAML
124 lines
3.7 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
|
|
%YAML 1.2
|
|
---
|
|
$id: http://devicetree.org/schemas/mailbox/nvidia,tegra186-hsp.yaml#
|
|
$schema: http://devicetree.org/meta-schemas/core.yaml#
|
|
|
|
title: NVIDIA Tegra Hardware Synchronization Primitives (HSP)
|
|
|
|
maintainers:
|
|
- Thierry Reding <thierry.reding@gmail.com>
|
|
- Jon Hunter <jonathanh@nvidia.com>
|
|
|
|
description: |
|
|
The HSP modules are used for the processors to share resources and
|
|
communicate together. It provides a set of hardware synchronization
|
|
primitives for interprocessor communication. So the interprocessor
|
|
communication (IPC) protocols can use hardware synchronization
|
|
primitives, when operating between two processors not in an SMP
|
|
relationship.
|
|
|
|
The features that HSP supported are shared mailboxes, shared
|
|
semaphores, arbitrated semaphores and doorbells.
|
|
|
|
The mbox specifier of the "mboxes" property in the client node should
|
|
contain two cells. The first cell determines the HSP type and the
|
|
second cell is used to identify the mailbox that the client is going
|
|
to use.
|
|
|
|
For shared mailboxes, the first cell composed of two fields:
|
|
- bits 15..8:
|
|
A bit mask of flags that further specifies the type of shared
|
|
mailbox to be used (based on the data size). If no flag is
|
|
specified then, 32-bit shared mailbox is used.
|
|
- bits 7..0:
|
|
Defines the type of the mailbox to be used. This field should be
|
|
TEGRA_HSP_MBOX_TYPE_SM for shared mailboxes.
|
|
|
|
For doorbells, the second cell specifies the index of the doorbell to
|
|
use.
|
|
|
|
For shared mailboxes, the second cell is composed of two fields:
|
|
- bits 31..24:
|
|
A bit mask of flags that further specify how the shared mailbox
|
|
will be used. Valid flags are:
|
|
- bit 31:
|
|
Defines the direction of the mailbox. If set, the mailbox
|
|
will be used as a producer (i.e. used to send data). If
|
|
cleared, the mailbox is the consumer of data sent by a
|
|
producer.
|
|
|
|
- bits 23..0:
|
|
The index of the shared mailbox to use. The number of available
|
|
mailboxes may vary by instance of the HSP block and SoC
|
|
generation.
|
|
|
|
The following file contains definitions that can be used to
|
|
construct mailbox specifiers:
|
|
|
|
<dt-bindings/mailbox/tegra186-hsp.h>
|
|
|
|
properties:
|
|
$nodename:
|
|
pattern: "^hsp@[0-9a-f]+$"
|
|
|
|
compatible:
|
|
oneOf:
|
|
- const: nvidia,tegra186-hsp
|
|
- const: nvidia,tegra194-hsp
|
|
- items:
|
|
- const: nvidia,tegra234-hsp
|
|
- const: nvidia,tegra194-hsp
|
|
|
|
reg:
|
|
maxItems: 1
|
|
|
|
interrupts:
|
|
minItems: 1
|
|
maxItems: 9
|
|
|
|
interrupt-names:
|
|
oneOf:
|
|
# shared interrupts are optional
|
|
- items:
|
|
- const: doorbell
|
|
|
|
- items:
|
|
- const: doorbell
|
|
- pattern: "^shared[0-7]$"
|
|
- pattern: "^shared[0-7]$"
|
|
- pattern: "^shared[0-7]$"
|
|
- pattern: "^shared[0-7]$"
|
|
- pattern: "^shared[0-7]$"
|
|
- pattern: "^shared[0-7]$"
|
|
- pattern: "^shared[0-7]$"
|
|
- pattern: "^shared[0-7]$"
|
|
|
|
- items:
|
|
- pattern: "^shared[0-7]$"
|
|
- pattern: "^shared[0-7]$"
|
|
- pattern: "^shared[0-7]$"
|
|
- pattern: "^shared[0-7]$"
|
|
|
|
"#mbox-cells":
|
|
const: 2
|
|
|
|
additionalProperties: false
|
|
|
|
examples:
|
|
- |
|
|
#include <dt-bindings/interrupt-controller/arm-gic.h>
|
|
#include <dt-bindings/mailbox/tegra186-hsp.h>
|
|
|
|
hsp_top0: hsp@3c00000 {
|
|
compatible = "nvidia,tegra186-hsp";
|
|
reg = <0x03c00000 0xa0000>;
|
|
interrupts = <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>;
|
|
interrupt-names = "doorbell";
|
|
#mbox-cells = <2>;
|
|
};
|
|
|
|
client {
|
|
mboxes = <&hsp_top0 TEGRA_HSP_MBOX_TYPE_DB TEGRA_HSP_DB_MASTER_CCPLEX>;
|
|
};
|