x86/PCI: sta2x11: use default DMA address translation

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The devices found behind this PCIe chip have unusual DMA mapping
constraints as there is an AMBA interconnect placed in between them and
the different PCI endpoints. The offset between physical memory
addresses and AMBA's view is provided by reading a PCI config register,
which is saved and used whenever DMA mapping is needed.

It turns out that this DMA setup can be represented by properly setting
'dma_pfn_offset', 'dma_bus_mask' and 'dma_mask' during the PCI device
enable fixup. And ultimately allows us to get rid of this device's
custom DMA functions.

Aside from the code deletion and DMA setup, sta2x11_pdev_to_mapping() is
moved to avoid warnings whenever CONFIG_PM is not enabled.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>

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This commit is contained in:

Nicolas Saenz Julienne 2019-11-07 16:06:45 +01:00 • committed by Christoph Hellwig

parent b12d66278d

commit e380a0394c

4 changed files with 26 additions and 122 deletions

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1

arch/x86/Kconfig

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3

arch/x86/include/asm/device.h

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9

arch/x86/include/asm/dma-direct.h

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135

arch/x86/pci/sta2x11-fixup.c

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