linux-kernel - [PATCH 0/7] of: setup dma parameters using dma-ranges and dma-coherent

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Date:	Thu, 6 Mar 2014 17:19:51 +0800
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	<linux-kernel@...r.kernel.org>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Grygorii Strashko <grygorii.strashko@...com>
Subject: [PATCH 0/7] of: setup dma parameters using dma-ranges and dma-coherent

Based on comments from [1] discussion, it seems there is a need to
have a generic support to configure dma device parameters.
Series introduces support for setting up dma parameters based on
device tree properties like 'dma-ranges' and 'dma-coherent'.

The 'dma-ranges' helps to take care of few DMAable system memory restrictions
by use of dma_pfn_offset which we maintain now per device. Arch code then
uses it for dma address translations for such cases. We also setup
dma_mask accordingly during the device creation process.

The 'dma-coherent' property is used to setup coherent dma_ops. Arches
which are always coherent can make use of ARCH_IS_DMA_COHERENT to setup
coherent dma_ops always irrespective of 'dma-coherent' property.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Russell King <linux@....linux.org.uk>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Olof Johansson <olof@...om.net>
Cc: Grant Likely <grant.likely@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Linus Walleij <linus.walleij@...aro.org>
Cc: Grygorii Strashko <grygorii.strashko@...com>

Grygorii Strashko (3):
  of: introduce of_dma_get_range() helper
  of: configure the platform device dma_mask and dma_pfn_offset
  ARM: dma: Use dma_pfn_offset for dma address translation

Santosh Shilimkar (4):
  device: introduce per device dma_pfn_offset
  of: introduce of_dma_is_coherent() helper
  of: Add set_arch_dma_coherent_ops() and setup coherent dma_ops
  ARM: dma: implement set_arch_dma_coherent_ops()

 arch/arm/include/asm/dma-mapping.h |   24 ++++-
 drivers/of/platform.c              |  196 +++++++++++++++++++++++++++++++++++-
 include/linux/device.h             |    2 +
 include/linux/dma-mapping.h        |    7 ++
 include/linux/of_platform.h        |   14 +++
 5 files changed, 236 insertions(+), 7 deletions(-)

Regards,
Santosh
[1] http://www.spinics.net/lists/arm-kernel/msg311678.html
-- 
1.7.9.5

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