linux/drivers/mailbox
Peng Fan 0a67003b19 mailbox: imx: add SCU MU support
i.MX8/8X SCU MU is dedicated for communication between SCU and Cortex-A
cores from hardware design, and could not be reused for other purpose.

Per i.MX8/8X Reference mannual, Chapter "12.9.2.3.2 Messaging Examples",
 Passing short messages: Transmit register(s) can be used to pass
 short messages from one to four words in length. For example, when
 a four-word message is desired, only one of the registers needs to
 have its corresponding interrupt enable bit set at the receiver side;
 the message’s first three words are written to the registers whose
 interrupt is masked, and the fourth word is written to the other
 register (which triggers an interrupt at the receiver side).

i.MX8/8X SCU firmware IPC is an implementation of passing short
messages. But current imx-mailbox driver only support one word
message, i.MX8/8X linux side firmware has to request four TX
and four RX to support IPC to SCU firmware. This is low efficent
and more interrupts triggered compared with one TX and
one RX.

To make SCU MU work,
  - parse the size of msg.
  - Only enable TR0/RR0 interrupt for transmit/receive message.
  - For TX/RX, only support one TX channel and one RX channel
  - For RX, support receive msg larger than 4 u32 words.
  - Support 6 channels, TX0/RX0/RXDB[0-3], not support TXDB.

Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2020-03-19 23:04:32 -05:00
..
arm_mhu.c mailbox: arm_mhu: reorder header inclusion and drop unneeded ones 2019-07-10 23:08:43 -05:00
armada-37xx-rwtm-mailbox.c mailbox:armada-37xx-rwtm:remove duplicate print in armada_37xx_mbox_probe() 2020-03-19 23:00:32 -05:00
bcm2835-mailbox.c mailbox: bcm2835: Use device-managed registration API 2018-12-21 16:49:25 -06:00
bcm-flexrm-mailbox.c maillbox: bcm-flexrm-mailbox: handle cmpl_pool dma allocation failure 2020-03-19 23:00:32 -05:00
bcm-pdc-mailbox.c mailbox: bcm-pdc: Use scnprintf() for avoiding potential buffer overflow 2020-03-19 23:00:32 -05:00
hi3660-mailbox.c mailbox: hi3660: Use device-managed registration API 2018-12-21 16:49:25 -06:00
hi6220-mailbox.c mailbox: no need to set .owner platform_driver_register 2019-11-26 22:45:15 -06:00
imx-mailbox.c mailbox: imx: add SCU MU support 2020-03-19 23:04:32 -05:00
Kconfig mailbox: sun6i-msgbox: Add a new mailbox driver 2020-03-19 23:00:32 -05:00
mailbox-altera.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
mailbox-sti.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
mailbox-test.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
mailbox-xgene-slimpro.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
mailbox.c mailbox: handle failed named mailbox channel request 2019-07-11 10:19:00 -05:00
mailbox.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
Makefile mailbox: sun6i-msgbox: Add a new mailbox driver 2020-03-19 23:00:32 -05:00
mtk-cmdq-mailbox.c mailbox: mediatek: remove implementation related to atomic_exec 2020-03-19 23:00:32 -05:00
omap-mailbox.c mailbox/omap: Handle if CONFIG_PM is disabled 2019-11-26 22:44:53 -06:00
pcc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
pl320-ipc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201 2019-05-30 11:29:52 -07:00
platform_mhu.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 285 2019-06-05 17:36:37 +02:00
qcom-apcs-ipc-mailbox.c mailbox: qcom-apcs: fix max_register value 2019-09-17 00:54:29 -05:00
rockchip-mailbox.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288 2019-06-05 17:36:37 +02:00
stm32-ipcc.c mailbox: stm32-ipcc: Update wakeup management 2019-11-30 23:08:59 -06:00
sun6i-msgbox.c mailbox: sun6i-msgbox: Add a new mailbox driver 2020-03-19 23:00:32 -05:00
tegra-hsp.c mailbox: tegra: Fix superfluous IRQ error message 2019-11-12 15:09:19 +01:00
ti-msgmgr.c mailbox: ti-msgmgr: Use device-managed registration API 2018-12-21 16:49:26 -06:00
zynqmp-ipi-mailbox.c mailbox: ZynqMP IPI mailbox controller 2019-03-06 20:34:20 -06:00