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| author | Alexander Bigga <ab@mycable.de> | 2006-12-21 11:25:19 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2007-01-10 20:02:24 +0000 |
| commit | 8a93c4968fc177844680987b31d00d1fc3bc02aa (patch) | |
| tree | 11d46ea7250a309ff3e26e6568d2096a36e82fe8 | |
| parent | e16d8df0be26c8e82c4a1188af8143f2d466b12a (diff) | |
| download | linux-8a93c4968fc177844680987b31d00d1fc3bc02aa.tar.bz2 | |
[MIPS] Alchemy: Fix PCI-memory access
The problem was introduced in 2.6.18.3 with the casting of some
36bit-defines (PCI memory) in au1000.h to resource_size_t which may be
u32 or u64 depending on the experimental CONFIG_RESOURCES_64BIT.
With unset CONFIG_RESOURCES_64BIT, the pci-memory cannot be accessed
because the ioremap in arch/mips/au1000/common/pci.c already used the
truncated addresses.
With set CONFIG_RESOURCES_64BIT, things get even worse, because PCI-scan
aborts, due to resource conflict: request_resource() in arch/mips/pci/pci.c
fails because the maximum iomem-address is 0xffffffff (32bit) but the
pci-memory-start-address is 0x440000000 (36bit).
To get pci working again, I propose the following patch:
1. remove the resource_size_t-casting from au1000.h again
2. make the casting in arch/mips/au1000/common/pci.c (it's allowed and
necessary here. The 36bit-handling will be done in __fixup_bigphys_addr).
With this patch pci works again like in 2.6.18.2, the gcc-compile warnings
in pci.c are gone and it doesn't depend on CONFIG_EXPERIMENTAL.
Signed-off-by: Alexander Bigga <ab@mycable.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
| -rw-r--r-- | arch/mips/au1000/common/pci.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/mips/au1000/common/pci.c b/arch/mips/au1000/common/pci.c index da591f674893..9f8ce08e173b 100644 --- a/arch/mips/au1000/common/pci.c +++ b/arch/mips/au1000/common/pci.c @@ -39,15 +39,15 @@ /* TBD */ static struct resource pci_io_resource = { - .start = PCI_IO_START, - .end = PCI_IO_END, + .start = (resource_size_t)PCI_IO_START, + .end = (resource_size_t)PCI_IO_END, .name = "PCI IO space", .flags = IORESOURCE_IO }; static struct resource pci_mem_resource = { - .start = PCI_MEM_START, - .end = PCI_MEM_END, + .start = (resource_size_t)PCI_MEM_START, + .end = (resource_size_t)PCI_MEM_END, .name = "PCI memory space", .flags = IORESOURCE_MEM }; |