mailbox: Add support for Hi3660 mailbox

Hi3660 mailbox controller is used to send message within multiple
processors, MCU, HIFI, etc.  It supports 32 mailbox channels and every
channel can only be used for single transferring direction.  Once the
channel is enabled, it needs to specify the destination interrupt and
acknowledge interrupt, these two interrupt vectors are used to create
the connection between the mailbox and interrupt controllers.

The data transferring supports two modes, one is named as "automatic
acknowledge" mode so after send message the kernel doesn't need to wait
for acknowledge from remote and directly return; there have another mode
is to rely on handling interrupt for acknowledge.

This commit is for initial version driver, which only supports
"automatic acknowledge" mode to support CPU clock, which is the only
one consumer to use mailbox and has been verified.  Later may enhance
this driver for interrupt mode (e.g. for supporting HIFI).

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Ruyi Wang <wangruyi@huawei.com>
Signed-off-by: Kaihua Zhong <zhongkaihua@huawei.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index 7c24900554a7..a2bb27446dce 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -108,6 +108,14 @@ config TI_MESSAGE_MANAGER
 	  multiple processors within the SoC. Select this driver if your
 	  platform has support for the hardware block.
 
+config HI3660_MBOX
+	tristate "Hi3660 Mailbox"
+	depends on ARCH_HISI && OF
+	help
+	  An implementation of the hi3660 mailbox. It is used to send message
+	  between application processors and other processors/MCU/DSP. Select
+	  Y here if you want to use Hi3660 mailbox controller.
+
 config HI6220_MBOX
 	tristate "Hi6220 Mailbox"
 	depends on ARCH_HISI