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| author |   Christoph Hellwig <hch@lst.de> | 2018-06-15 13:08:49 +0200 |
|---|---|---|
| committer |   Paul Burton <paul.burton@mips.com> | 2018-06-24 09:27:27 -0700 |
| commit | d1f2564a5639bb54493eaa313aef612aee47ba7c (patch) | |
| tree | e27dc3e062bb8d927c8e999af4f58e83f21b499d /arch/mips/pci/pci-ar2315.c | |
| parent | MIPS: IP32: use generic dma noncoherent ops (diff) | |
| download | linux-dev-d1f2564a5639bb54493eaa313aef612aee47ba7c.tar.xz linux-dev-d1f2564a5639bb54493eaa313aef612aee47ba7c.zip | |
MIPS: ath25: use generic dma noncoherent ops
Provide phys_to_dma/dma_to_phys helpers only if PCI support is
enabled, everything else is generic.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Patchwork: https://patchwork.linux-mips.org/patch/19547/
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/pci-ar2315.c')
| -rw-r--r-- | arch/mips/pci/pci-ar2315.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/mips/pci/pci-ar2315.c b/arch/mips/pci/pci-ar2315.c index b4fa6413c4e5..c539d0d2b0cf 100644 --- a/arch/mips/pci/pci-ar2315.c +++ b/arch/mips/pci/pci-ar2315.c @@ -149,6 +149,13 @@ #define AR2315_PCI_HOST_SLOT 3 #define AR2315_PCI_HOST_DEVID ((0xff18 << 16) | PCI_VENDOR_ID_ATHEROS) +/* + * We need some arbitrary non-zero value to be programmed to the BAR1 register + * of PCI host controller to enable DMA. The same value should be used as the + * offset to calculate the physical address of DMA buffer for PCI devices. + */ +#define AR2315_PCI_HOST_SDRAM_BASEADDR 0x20000000 + /* ??? access BAR */ #define AR2315_PCI_HOST_MBAR0 0x10000000 /* RAM access BAR */ @@ -167,6 +174,23 @@ struct ar2315_pci_ctrl { struct resource io_res; }; +static inline dma_addr_t ar2315_dev_offset(struct device *dev) +{ + if (dev && dev_is_pci(dev)) + return AR2315_PCI_HOST_SDRAM_BASEADDR; + return 0; +} + +dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr) +{ + return paddr + ar2315_dev_offset(dev); +} + +phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dma_addr) +{ + return dma_addr - ar2315_dev_offset(dev); +} + static inline struct ar2315_pci_ctrl *ar2315_pci_bus_to_apc(struct pci_bus *bus) { struct pci_controller *hose = bus->sysdata; |