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path: root/drivers/mailbox/sprd-mailbox.c
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2021-04-14mailbox: sprd: Add supplementary inbox supportOrson Zhai1-17/+71
Some sensors connected to Unisoc mailbox will send data very frequently. This makes channel 0 very busy and the messages from other remote cores not able to be handled as soon as possible. It's a trick (un-documented) from Unisoc ASIC designers to resolve this special requirement that an inbox assigned to one of the remote cores before was modified to be exposed to host cpu core. Then from host side, a supplementary inbox is added for transferring mass but not emergency messages from the remote cores, such as step counting sensor, with an independent FIFO and interrupt which is as same as channel 0. Meanwihle, inbox part of this channel is still kept for original remote core to use. Signed-off-by: Orson Zhai <orson.zhai@unisoc.com> Reviewed-by: Baolin Wang <baolin.wang7@gmail.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2021-04-14mailbox: sprd: Introduce refcnt when clients requests/free channelsOrson Zhai1-14/+29
Unisoc mailbox has no way to be enabled/disabled for any single channel. They can only be set to startup or shutdown as a whole device at same time. Add a variable to count references to avoid mailbox FIFO being reset unexpectedly when clients are requesting or freeing channels. Also add a lock to dismiss possible conflicts from register r/w in different startup or shutdown threads. And fix the crash problem when early interrupts come from channel which has not been requested by client yet. Fixes: ca27fc26cd22 ("mailbox: sprd: Add Spreadtrum mailbox driver") Signed-off-by: Orson Zhai <orson.zhai@unisoc.com> Reviewed-by: Baolin Wang <baolin.wang7@gmail.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2021-04-14mailbox: fix various typos in commentsTom Saeger1-6/+6
Fix trivial typos in mailbox driver comments. s/Intergrated/Integrated/ s/extenstion/extension/ s/atleast/at least/ s/commnunication/communication/ s/assgined/assigned/ s/commnunication/communication/ s/recevied/received/ s/succeded/succeeded/ s/implmentation/implementation/ s/definiation/definition/ s/traget/target/ s/wont/won't/ Cc: trivial@kernel.org Signed-off-by: Tom Saeger <tom.saeger@oracle.com> Reviewed-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2021-02-15mailbox: sprd: correct definition of SPRD_OUTBOX_FIFO_FULLMagnum Shan1-1/+1
According to the specification, bit[2] represents SPRD_OUTBOX_FIFO_FULL, not bit[0], so correct it. Fixes: ca27fc26cd22 ("mailbox: sprd: Add Spreadtrum mailbox driver") Signed-off-by: Magnum Shan <magnum.shan@unisoc.com> Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com> Reviewed-by: Baolin Wang <baolin.wang7@gmail.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2020-05-31mailbox: sprd: Add Spreadtrum mailbox driverBaolin Wang1-0/+361
The Spreadtrum mailbox controller supports 8 channels to communicate with MCUs, and it contains 2 different parts: inbox and outbox, which are used to send and receive messages by IRQ mode. Signed-off-by: Baolin Wang <baolin.wang@unisoc.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>