|author||Chris Metcalf <firstname.lastname@example.org>||2010-11-02 12:05:10 -0400|
|committer||Chris Metcalf <email@example.com>||2010-11-24 13:13:49 -0500|
pci root complex: support for tile architecture
This change enables PCI root complex support for TILEPro. Unlike TILE-Gx, TILEPro has no support for memory-mapped I/O, so the PCI support consists of hypervisor upcalls for PIO, DMA, etc. However, the performance is fine for the devices we have tested with so far (1Gb Ethernet, SATA, etc.). The <asm/io.h> header was tweaked to be a little bit more aggressive about disabling attempts to map/unmap IO port space. The hacky <asm/pci-bridge.h> header was rolled into the <asm/pci.h> header and the result was simplified. Both of the latter two headers were preliminary versions not meant for release before now - oh well. There is one quirk for our TILEmpower platform, which accidentally negotiates up to 5GT and needs to be kicked down to 2.5GT. Signed-off-by: Chris Metcalf <firstname.lastname@example.org>
Diffstat (limited to 'arch/tile/Kconfig')
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 07ec8a865c1..e11b5fcb70e 100644
@@ -329,6 +329,18 @@ endmenu # Tilera-specific configuration
menu "Bus options"
+ bool "PCI support"
+ default y
+ select PCI_DOMAINS
+ Enable PCI root complex support, so PCIe endpoint devices can
+ be attached to the Tile chip. Many, but not all, PCI devices
+ are supported under Tilera's root complex driver.