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MIPS: IP27: use dma_direct_ops

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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
This commit is contained in:
Christoph Hellwig
2018-06-15 13:08:44 +02:00
committed by Paul Burton
parent dffbfde758
commit 54aed4dd35
3 changed files with 15 additions and 71 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
arch/mips/pci/pci-ip27.c
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@@ -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.