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| author | Ivan Kokshaysky <ink@jurassic.park.msu.ru> | 2009-02-17 13:46:53 +0300 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@hobbes.lan> | 2009-03-20 05:29:36 +0300 |
| commit | 10a0ef39fbd1d484c2bbc1ffd83d57ecef209140 (patch) | |
| tree | 2659f907c2039e0730d69fb8dac6e6f8e5b3cd34 /arch/alpha/include/asm/pci.h | |
| parent | ea7415512a07add2b09c070c9a5d1950833cf9b3 (diff) | |
| download | linux-10a0ef39fbd1d484c2bbc1ffd83d57ecef209140.tar.xz | |
PCI/alpha: pci sysfs resources
This closes http://bugzilla.kernel.org/show_bug.cgi?id=10893
which is a showstopper for X development on alpha.
The generic HAVE_PCI_MMAP code (drivers/pci-sysfs.c) is not
very useful since we have to deal with three different types
of MMIO address spaces: sparse and dense mappings for old
ev4/ev5 machines and "normal" 1:1 MMIO space (bwx) for ev56 and
later.
Also "write combine" mappings are meaningless on alpha - roughly
speaking, alpha does write combining, IO reordering and other
optimizations by default, unless user splits IO accesses
with memory barriers.
I think the cleanest way to deal with resource files on alpha
is to convert the default no-op pci_create_resource_files() and
pci_remove_resource_files() for !HAVE_PCI_MMAP case into __weak
functions and override them with alpha specific ones.
Another alpha hook is needed for "legacy_" resource files
to handle sparse addressing (pci_adjust_legacy_attr).
With the "standard" resourceN files on ev56/ev6 libpciaccess
works "out of the box". Handling of resourceN_sparse/resourceN_dense
files on older machines obviously requires some userland work.
Sparse/dense stuff has been tested on sx164 (pca56/pyxis, normally
uses bwx IO) with the kernel hacked into "cia compatible" mode.
Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'arch/alpha/include/asm/pci.h')
| -rw-r--r-- | arch/alpha/include/asm/pci.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/pci.h b/arch/alpha/include/asm/pci.h index 2a14302c17a3..cb04eaa6ba33 100644 --- a/arch/alpha/include/asm/pci.h +++ b/arch/alpha/include/asm/pci.h @@ -273,4 +273,18 @@ struct pci_dev *alpha_gendev_to_pci(struct device *dev); extern struct pci_dev *isa_bridge; +extern int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, + size_t count); +extern int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, + size_t count); +extern int pci_mmap_legacy_page_range(struct pci_bus *bus, + struct vm_area_struct *vma, + enum pci_mmap_state mmap_state); +extern void pci_adjust_legacy_attr(struct pci_bus *bus, + enum pci_mmap_state mmap_type); +#define HAVE_PCI_LEGACY 1 + +extern int pci_create_resource_files(struct pci_dev *dev); +extern void pci_remove_resource_files(struct pci_dev *dev); + #endif /* __ALPHA_PCI_H */ |