u-boot.git/arch/arm/include/asm/dma-mapping.h, branch master

arm: Don't include common.h in header files

2020-05-18T18:54:24+00:00

It is bad practice to include common.h in other header files since it can
bring in any number of superfluous definitions. It implies that some C
files don't include it and thus may be missing CONFIG options that are set
up by that file. The C files should include these themselves.

Update some header files in arch/arm to drop this.

Signed-off-by: Simon Glass

dma-mapping: move dma_map_(un)single() to

2020-02-19T13:27:30+00:00

The implementation of dma_map_single() and dma_unmap_single() is
exactly the same for all the architectures that support them.

Factor them out to , and make all drivers to
include  instead of .

If we need to differentiate them for some architectures, we can
move the generic definitions to .

Add some comments to the helpers. The concept is quite similar to
the DMA-API of Linux kernel. Drivers are agnostic about what is
going on behind the scene. Just call dma_map_single() before the
DMA, and dma_unmap_single() after it.

Signed-off-by: Masahiro Yamada

dma-mapping: fix the prototype of dma_unmap_single()

2020-02-19T13:27:30+00:00

dma_unmap_single() takes the dma address, not virtual address.

Signed-off-by: Masahiro Yamada

dma-mapping: fix the prototype of dma_map_single()

2020-02-19T13:27:30+00:00

Make dma_map_single() return the dma address, and remove the
pointless volatile.

Signed-off-by: Masahiro Yamada

asm: dma-mapping.h: Fix dma mapping functions

2020-01-25T17:04:36+00:00

Subsystems such as USB expect dma_map_single() and dma_unmap_single() to
do dcache flush/invalidate operations as required. For example, see
see drivers/usb/gadget/udc/udc-core.c::usb_gadget_map_request().
Currently drivers do this locally, (see drivers/usb/dwc3/ep0.c,
drivers/mtd/nand/raw/denali.c etc..)
Update arch specific dma_map_single() and dma_unmap_single() APIs to do
cache flush/invalidate  operations, so that drivers need not implement
them locally.

Signed-off-by: Vignesh Raghavendra 
Reviewed-by: Masahiro Yamada 
Reviewed-by: Rick Chen

arm: Round the dma_alloc_coherent memory size to cache line aligned

2019-01-09T12:13:31+00:00

When running usb dwc3 gadget driver, we meet random USB enumeration failure in fastboot.
The root cause is a cache coherence issue. When it happens, the ctrl_req in
gadget driver is allocated at 0xfe932f40, and the usb_composite_dev (cdev)
is allocated at 0xfe932f60. So after we submit the setup request (cache flushed) to USB
controller, any accessing to usb_composite_dev variable will cause the cache line refill, then
when setup transfer is completed, reading the setup data in ctrl_req will gets old value from
cache not from memory.

The ctrl_req is allocated by API dma_alloc_coherent, but u-boot don't have cohernet memory.
so it still needs cache maintain operations before/after HW accessing. Since the cache flush or
invalidate bases on cache line, so when the allocated memory size is not cache line aligned,
potentially it may meet such issue.

This patch modifies the dma_alloc_coherent API to round the size to cache line aligned.

Signed-off-by: Ye Li 
Reviewed-by: Peng Fan

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

dma: import linux/dma-direction.h to consolidate enum dma_data_direction

2017-09-12T22:02:23+00:00

Import include/linux/dma-direction.h from Linux 4.13-rc7 and delete
duplicated definitions of enum dma_data_direction.

Signed-off-by: Masahiro Yamada 
Reviewed-by: Andy Shevchenko

arm: asm: dma-mapping: added dma_free_coherent API

2015-04-14T03:48:09+00:00

Added dma_free_coherent corresponding to the dma_alloc_coherent in
dma-mapping.h in order to free memory allocated using dma_alloc_coherent.
This API is used in dwc3 driver.

Signed-off-by: Kishon Vijay Abraham I 
Reviewed-by: Lukasz Majewski

include: asm: dma-mapping: get rid of the compilation warning in udc-core

2015-04-14T03:48:08+00:00

Fixed the following warning here.
"warning: ‘dma_alloc_coherent’ defined but not used" while compiling
udc-core

Signed-off-by: Kishon Vijay Abraham I 
Reviewed-by: Lukasz Majewski