tree a4c3762b1228f901f62d40b53ed1a953b25926b4
parent 0c9af0a639bf9180839d548f91547b58de921ca9
author Nico Huber <nico.h@gmx.de> 1704581128 +0100
committer Nico Huber <nico.h@gmx.de> 1721642927 +0000

spi25: Implement multi-i/o reads

We describe a read operation in a new  `struct spi_read_op`. It's
comprised of the i/o mode, its opcode, an optional mode byte, and
the number of dummy bytes.

Based on this information  about the various read operations, and
the flash and master feature flags,  we select the read operation
with the highest throughput.

The following assumption is made about 4BA chips: When it supports
native-4BA fast reads  and a multi-i/o version of the regular fast
read, then it should also support the respective native-4BA, multi-
i/o version (yes, JEDEC, there are too many read commands!). So far
this seems to hold for the chips in our database.

Change-Id: I3c93e71d85f769831d637c14d3571f7ddb54d8b2
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.sourcearcade.org/c/flashprog/+/49
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>