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| author | Christoph Hellwig | 2018-06-15 13:08:44 +0200 |
|---|---|---|
| committer | Paul Burton | 2018-06-24 18:26:04 +0200 |
| commit | 54aed4dd35269ef15eb1569517f34fb3961d4d34 (patch) | |
| tree | f3ac11d100a9c06b3a311aab05836e9904a0f04e /arch/mips/pci | |
| parent | MIPS: use dma_direct_ops for coherent I/O (diff) | |
| download | kernel-qcow2-linux-54aed4dd35269ef15eb1569517f34fb3961d4d34.tar.gz kernel-qcow2-linux-54aed4dd35269ef15eb1569517f34fb3961d4d34.tar.xz kernel-qcow2-linux-54aed4dd35269ef15eb1569517f34fb3961d4d34.zip | |
MIPS: IP27: use dma_direct_ops
IP27 is coherent and has a reasonably direct mapping, just with a little
per-bus offset added into the dma address.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19542/
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: David Daney <david.daney@cavium.com>
Cc: Kevin Cernekee <cernekee@gmail.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Tom Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhc@lemote.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-mips@linux-mips.org
Diffstat (limited to 'arch/mips/pci')
| -rw-r--r-- | arch/mips/pci/pci-ip27.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/mips/pci/pci-ip27.c b/arch/mips/pci/pci-ip27.c index 0f09eafa5e3a..65b48d41a229 100644 --- a/arch/mips/pci/pci-ip27.c +++ b/arch/mips/pci/pci-ip27.c @@ -11,6 +11,7 @@ #include <linux/export.h> #include <linux/pci.h> #include <linux/smp.h> +#include <linux/dma-direct.h> #include <asm/sn/arch.h> #include <asm/pci/bridge.h> #include <asm/paccess.h> @@ -182,6 +183,19 @@ int pcibios_plat_dev_init(struct pci_dev *dev) return 0; } +dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct bridge_controller *bc = BRIDGE_CONTROLLER(pdev->bus); + + return bc->baddr + paddr; +} + +phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dma_addr) +{ + return dma_addr & ~(0xffUL << 56); +} + /* * Device might live on a subordinate PCI bus. XXX Walk up the chain of buses * to find the slot number in sense of the bridge device register. |