mailbox: tegra-hsp: Add support for shared mailboxes

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The Tegra HSP block supports 'shared mailboxes' that are simple 32-bit
registers consisting of a FULL bit in MSB position and 31 bits of data.
The hardware can be configured to trigger interrupts when a mailbox
is empty or full. Add support for these shared mailboxes to the HSP
driver.

The initial use for the mailboxes is the Tegra Combined UART. For this
purpose, we use interrupts to receive data, and spinning to wait for
the transmit mailbox to be emptied to minimize unnecessary overhead.

Based on work by Mikko Perttunen <mperttunen@nvidia.com>.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

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This commit is contained in:

Thierry Reding

2018-11-28 10:54:13 +01:00

committed by Jassi Brar

parent fed8b7e366

commit 91b1b1c3da

1 changed files with 444 additions and 62 deletions

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drivers/mailbox/tegra-hsp.c

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