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| author | Lennert Buytenhek <buytenh@wantstofly.org> | 2009-11-07 14:49:18 +0100 |
|---|---|---|
| committer | Nicolas Pitre <nico@fluxnic.net> | 2009-11-07 20:14:21 -0500 |
| commit | 35f029e2514be209eb0e88c7d927f3bcc42a5cc2 (patch) | |
| tree | 671a2d2ff57277a97633d81b1e3a54781a7e2da7 /arch/arm | |
| parent | 6de95c198729d34a85c88f8844f1c3d57fb6da00 (diff) | |
| download | kernel_samsung_smdk4412-35f029e2514be209eb0e88c7d927f3bcc42a5cc2.zip kernel_samsung_smdk4412-35f029e2514be209eb0e88c7d927f3bcc42a5cc2.tar.gz kernel_samsung_smdk4412-35f029e2514be209eb0e88c7d927f3bcc42a5cc2.tar.bz2 | |
[ARM] kirkwood: fix PCI I/O port assignment
Instead of allocating PCI devices I/O port bus addresses from the
000xxxxx I/O port range as intended, due to a bus versus physical
address mixup, the Kirkwood PCIe handling code inadvertently
allocated I/O port bus addresses from the f20xxxxx address range
(which is the physical address range of the PCIe I/O mapping window),
but then direct all I/O port accesses to bus addresses 000xxxxx,
which would then not be decoded at all.
Fix this by setting the base address of the PCIe I/O space struct
resource to KIRKWOOD_PCIE_IO_BUS_BASE instead of the incorrect
KIRKWOOD_PCIE_IO_PHYS_BASE, and fix up __io() to expect addresses
offsetted by the former instead of the latter.
(The suggested fix of directing I/O port accesses from the host to
bus addresses f20xxxxx instead has the problem that assigning full
32bit I/O port bus addresses (f20xxxxx) doesn't work on all PCI
devices, as not all PCI devices implement full 32 bit BAR registers
for I/O ports. We should really try to allocate I/O port bus
addresses that fit in 16 bits.)
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-kirkwood/include/mach/io.h | 2 | ||||
| -rw-r--r-- | arch/arm/mach-kirkwood/pcie.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/mach-kirkwood/include/mach/io.h b/arch/arm/mach-kirkwood/include/mach/io.h index a643a84..44e8be0 100644 --- a/arch/arm/mach-kirkwood/include/mach/io.h +++ b/arch/arm/mach-kirkwood/include/mach/io.h @@ -15,7 +15,7 @@ static inline void __iomem *__io(unsigned long addr) { - return (void __iomem *)((addr - KIRKWOOD_PCIE_IO_PHYS_BASE) + return (void __iomem *)((addr - KIRKWOOD_PCIE_IO_BUS_BASE) + KIRKWOOD_PCIE_IO_VIRT_BASE); } diff --git a/arch/arm/mach-kirkwood/pcie.c b/arch/arm/mach-kirkwood/pcie.c index 5538820..0660e78 100644 --- a/arch/arm/mach-kirkwood/pcie.c +++ b/arch/arm/mach-kirkwood/pcie.c @@ -115,7 +115,7 @@ static int __init kirkwood_pcie_setup(int nr, struct pci_sys_data *sys) */ res[0].name = "PCIe I/O Space"; res[0].flags = IORESOURCE_IO; - res[0].start = KIRKWOOD_PCIE_IO_PHYS_BASE; + res[0].start = KIRKWOOD_PCIE_IO_BUS_BASE; res[0].end = res[0].start + KIRKWOOD_PCIE_IO_SIZE - 1; if (request_resource(&ioport_resource, &res[0])) panic("Request PCIe IO resource failed\n"); |