CVS commit: src/sys/arch/arm/broadcom

["Jason R Thorpe" <thorpej%netbsd.org@localhost>]

Module Name:    src
Committed By:   thorpej
Date:           Sun Dec 22 23:24:56 UTC 2019

Modified Files:
        src/sys/arch/arm/broadcom: bcm2835_bsc.c

Log Message:
Rewrite the bcm2835 i2c driver as an interrupt-driven state machine.  This
improves general system responsiveness when tranferring large amounts of
data on a single-core Pi board.  This also includes:

Cleanup i2c bus acquire / release, centralizing all of the logic into
iic_acquire_bus() / iic_release_bus().  "acquire" and "release" hooks
no longer need to be provided by back-end controller drivers (only if
they need special handling, e.g. powering on the i2c controller).
This results in the removal of a bunch of rendundant code from each
back-end controller driver.

Assert that we are not in hard interrupt context in iic_acquire_bus(),
iic_exec(), and iic_release_bus().


To generate a diff of this commit:
cvs rdiff -u -r1.13 -r1.14 src/sys/arch/arm/broadcom/bcm2835_bsc.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.