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spi_master: Introduce SPI_MASTER_4BA feature flag

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Add a feature flag SPI_MASTER_4BA to `struct spi_master` that advertises
programmer-side support for 4-byte addresses in generic commands (and
read/write commands if the master uses the default implementations). Set
it for all masters that handle commands address-agnostic.

Don't prefer native 4BA instructions if the master doesn't support them.

Change-Id: Ife66e3fc49b9716f9c99cad957095b528135ec2c
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/22421
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: David Hendricks <david.hendricks@gmail.com>
This commit is contained in:
Nico Huber
2017-11-10 20:18:23 +01:00
parent ed098d62d6
commit 1cf407b4f8
9 changed files with 30 additions and 5 deletions
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ch341a_spi.c
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@ -399,6 +399,7 @@ static int ch341a_spi_spi_send_command(struct flashctx *flash, unsigned int writ
static const struct spi_master spi_master_ch341a_spi = {
.type = SPI_CONTROLLER_CH341A_SPI,
.features = SPI_MASTER_4BA,
/* flashrom's current maximum is 256 B. CH341A was tested on Linux and Windows to accept atleast
* 128 kB. Basically there should be no hard limit because transfers are broken up into USB packets
* sent to the device and most of their payload streamed via SPI. */