summaryrefslogtreecommitdiff
path: root/arch/mips/pci
diff options
context:
space:
mode:
authorChristoph Hellwig <hch@lst.de>2018-06-15 14:08:49 +0300
committerPaul Burton <paul.burton@mips.com>2018-06-24 19:27:27 +0300
commitd1f2564a5639bb54493eaa313aef612aee47ba7c (patch)
treee27dc3e062bb8d927c8e999af4f58e83f21b499d /arch/mips/pci
parent03df8229a822ab2c262bf78b05a3ada686b885b9 (diff)
downloadlinux-d1f2564a5639bb54493eaa313aef612aee47ba7c.tar.xz
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')
-rw-r--r--arch/mips/pci/pci-ar2315.c24
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;