linux-toradex.git/include/linux/amba/pl08x.h, branch v3.3.5

dmaengine: move drivers to dma_transfer_direction

2011-10-27T15:23:43+00:00

fixup usage of dma direction by introducing dma_transfer_direction,
this patch moves dma/drivers/* to use new enum

Cc: Jassi Brar 
Cc: Russell King 
Cc: Viresh Kumar 
Cc: Linus Walleij 
Cc: Nicolas Ferre 
Cc: Mika Westerberg 
Cc: H Hartley Sweeten 
Cc: Li Yang 
Cc: Zhang Wei 
Cc: Sascha Hauer 
Cc: Guennadi Liakhovetski 
Cc: Shawn Guo 
Cc: Yong Wang 
Cc: Tomoya MORINAGA 
Cc: Boojin Kim 
Cc: Barry Song 
Acked-by: Mika Westerberg 
Acked-by: Linus Walleij 
Acked-by: Viresh Kumar 
Acked-by: Nicolas Ferre 
Signed-off-by: Vinod Koul

dmaengine/amba-pl08x: Add support for sg len greater than one for slave transfers

2011-09-19T09:43:06+00:00

Untill now, sg_len greater than one is not supported. This patch adds support to
do that.

Note: Still, if peripheral is flow controller, sg_len can't be greater that one.

Signed-off-by: Viresh Kumar 
Acked-by: Linus Walleij 
Signed-off-by: Vinod Koul

dmaengine/amba-pl08x: Pass flow controller information with slave channel data

2011-08-25T14:03:39+00:00

At least, on SPEAr platforms there is one peripheral, JPEG, which can be flow
controller for DMA transfer. Currently DMA controller driver didn't support
peripheral flow controller configurations.

This patch adds device_fc field in struct pl08x_channel_data, which will be used
only for slave transfers and is not used in case of mem2mem transfers.

Signed-off-by: Viresh Kumar 
Acked-by: Linus Walleij 
Signed-off-by: Vinod Koul

dmaengine/amba-pl08x: Get rid of pl08x_pre_boundary()

2011-08-25T14:03:38+00:00

Pl080 Manual says: "Bursts do not cross the 1KB address boundary"

We can program the controller to cross 1 KB boundary on a burst and controller
can take care of this boundary condition by itself.

Following is the discussion with ARM Technical Support Guys (David):
[Viresh] Manual says: "Bursts do not cross the 1KB address boundary"

What does that actually mean? As, Maximum size transferable with a single LLI is
4095 * 4 =16380 ~ 16KB. So, if we don't have src/dest address aligned to burst
size, we can't use this big of an LLI.

[David] There is a difference between bursts describing the total data
transferred by the DMA controller and AHB bursts. Bursts described by the
programmable parameters in the PL080 have no direct connection with the bursts
that are seen on the AHB bus.

The statement that "Bursts do not cross the 1KB address boundary" in the TRM is
referring to AHB bursts, where this limitation is a requirement of the AHB spec.
You can still issue bursts within the PL080 that are in excess of 1KB. The
PL080 will make sure that its bursts are broken down into legal AHB bursts which
will be formatted to ensure that no AHB burst crosses a 1KB boundary.

Based on above discussion, this patch removes all code related to 1 KB boundary
as we are not required to handle this in driver.

Signed-off-by: Viresh Kumar 
Acked-by: Linus Walleij 
Signed-off-by: Vinod Koul

dmaengine/amba-pl08x: Complete doc comment for struct pl08x_txd

2011-08-25T14:03:37+00:00

Doc comment for struct pl08x_txd was incomplete. Complete that.

Signed-off-by: Viresh Kumar 
Acked-by: Linus Walleij 
Signed-off-by: Vinod Koul

DMA: PL08x: constify plchan->cd and plat->slave_channels

2011-07-26T10:03:28+00:00

We no longer write to the channel data structure, so we can make it
const throughout the driver.

Acked-by: Linus Walleij 
Signed-off-by: Russell King 
Signed-off-by: Vinod Koul

DMA: PL08x: separately store source/destination cctl

2011-07-26T10:03:28+00:00

Store the source/destination cctl values into the channel structure.
This moves us towards being able to avoid a configuration call each
time we use the channel.

Acked-by: Linus Walleij 
Signed-off-by: Russell King 
Signed-off-by: Vinod Koul

DMA: PL08x: separately store source/destination slave address

2011-07-26T10:03:28+00:00

Store the source/destination slave address separately into the channel
structure.  This moves us towards being able to avoid a configuration
call each time we use the channel.

Acked-by: Linus Walleij 
Signed-off-by: Russell King 
Signed-off-by: Vinod Koul

ARM: PL08x: cleanup comments

2011-01-17T00:55:43+00:00

Cleanup the formatting of comments, remove some which don't make sense
anymore.

Signed-off-by: Russell King 
[fix conflict with 96a608a4]
Signed-off-by: Dan Williams

ARM: PL08x: fix a warning

2011-01-15T01:51:11+00:00

drivers/dma/amba-pl08x.c: In function 'pl08x_start_txd':
drivers/dma/amba-pl08x.c:205: warning: dereferencing 'void *' pointer

We never dereference llis_va aside from assigning it to a struct
pl08x_lli pointer or calculating the address of array element 0.

Signed-off-by: Dan Williams