u-boot.git/drivers/spi, branch v2018.05

SPDX: Convert all of our single license tags to Linux Kernel style

2018-05-07T13:34:12+00:00

When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini

Remove unnecessary instances of DECLARE_GLOBAL_DATA_PTR

2018-04-27T18:54:48+00:00

We have a large number of places where while we historically referenced
gd in the code we no longer do, as well as cases where the code added
that line "just in case" during development and never dropped it.

Signed-off-by: Tom Rini

Convert CONFIG_SPI to Kconfig

2018-04-27T18:54:11+00:00

This converts the following to Kconfig:
   CONFIG_SPI

This partly involves updating code that assumes that CONFIG_SPI implies
things that are specific to the MPC8xx SPI driver.  For now, just update
the CONFIG tests.  This also involves reworking the default for
CONFIG_SYS_DEF_EEPROM_ADDR so that we don't set it when we cannot make a
reasonable default, as it does not cause any compile failures.

Signed-off-by: Adam Ford 
Signed-off-by: Tom Rini

spi: dw: invert wait condition in dw_spi_xfer

2018-04-23T05:46:41+00:00

While switching to readl_poll_timeout macros from custom code
the waiting condition was accidently inverted, so it was pure
luck that this code works at least in some conditions.

Fix that by inverting exit condition for readl_poll_timeout.

Fixes: c6b4f031d9 ("DW SPI: fix tx data loss on FIFO flush")

Signed-off-by: Eugeniy Paltsev 
Reviewed-by: Jagan Teki

spi: sh_qspi: Make use of the 32byte FIFO

2018-04-11T21:19:51+00:00

The QSPI controller on RCar Gen2 has 32byte FIFO. Instead of doing
the SPI transmission 1 byte at time, if there is a 32byte chunk of
data to be transferred, fill the FIFO completely and then transfer
the data to/from the FIFO. This increases the SPI NOR access speed
significantly.

Signed-off-by: Marek Vasut 
Cc: Nobuhiro Iwamatsu

spi: sh_qspi: Replace ad hoc waiting with wait_for_bit

2018-04-11T21:19:51+00:00

Replace the ad-hoc endless loops with wait_for_bit() with
reasonable timeout. Note that the loops had internal 10uS
delays, although there is no reason for those on this HW,
so they are dropped.

Signed-off-by: Marek Vasut 
Cc: Nobuhiro Iwamatsu

spi: sh_qspi: Drop SPBDCR wait

2018-04-11T21:19:51+00:00

Waiting for SPBDCR == 1 is not required and is covered by the
subsequent wait for SPSR_SPRFF, so drop this.

Signed-off-by: Marek Vasut 
Cc: Nobuhiro Iwamatsu

spi: sh_qspi: Replace data types with short ones

2018-04-11T21:19:50+00:00

Just replace unsigned {char,short,long} with u{8,16,32},
no functional change.

Signed-off-by: Marek Vasut 
Cc: Nobuhiro Iwamatsu

mtd: spi: Add Renesas RPC SPI-flash driver

2018-04-11T21:12:01+00:00

Add driver for the RPC block in SPI-flash mode. This driver allows
access to a SPI NOR flash attached to the RPC block and does not
support RPC in Hyperflash mode. Note that this block is extremely
selective when communicating with the SPI NOR.

Signed-off-by: Marek Vasut 
Cc: Nobuhiro Iwamatsu

Revert "spi: atmel: Drop non-dm code"

2018-04-07T13:19:00+00:00

As we aren't quite able to convert some platforms with a very small size
limit in SPL yet, we need to revert this for now.

This reverts commit 7b0947787358c6b277431d6b76ce043d8bec641d.

Signed-off-by: Tom Rini