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| author | Christoph Hellwig <hch@lst.de> | 2018-12-08 09:39:12 -0800 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-12-11 14:46:10 +0100 |
| commit | b535d1fca6d63ae6096e7030331e6e698aac4455 (patch) | |
| tree | 066177825f4ad14065f2f12eec03b873231bc35e /arch/sparc/include/asm/leon.h | |
| parent | a24ca8a253bd6e2644eba069b78fec80928d7b76 (diff) | |
| download | linux-b535d1fca6d63ae6096e7030331e6e698aac4455.tar.bz2 | |
sparc: move the leon PCI memory space comment to <asm/leon.h>
It has nothing to do with the content of the pci.h header.
Suggested by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/include/asm/leon.h')
| -rw-r--r-- | arch/sparc/include/asm/leon.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/leon.h b/arch/sparc/include/asm/leon.h index c68bb5b76e3d..77ea406ff9df 100644 --- a/arch/sparc/include/asm/leon.h +++ b/arch/sparc/include/asm/leon.h @@ -255,4 +255,13 @@ extern int leon_ipi_irq; #define _pfn_valid(pfn) ((pfn < last_valid_pfn) && (pfn >= PFN(phys_base))) #define _SRMMU_PTE_PMASK_LEON 0xffffffff +/* + * On LEON PCI Memory space is mapped 1:1 with physical address space. + * + * I/O space is located at low 64Kbytes in PCI I/O space. The I/O addresses + * are converted into CPU addresses to virtual addresses that are mapped with + * MMU to the PCI Host PCI I/O space window which are translated to the low + * 64Kbytes by the Host controller. + */ + #endif |