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| author |   Russell King <rmk@dyn-67.arm.linux.org.uk> | 2008-11-09 11:18:36 +0000 |
|---|---|---|
| committer |   Russell King <rmk+kernel@arm.linux.org.uk> | 2008-11-09 11:18:36 +0000 |
| commit | ebb4c65869db7213280ad9c510637683939b5ff8 (patch) | |
| tree | e9aa372c806fad73a04ba2f9d16d1f17491a11cf /arch/arm/plat-iop | |
| parent | [ARM] versatile: correct MMC clock rate (diff) | |
| download | linux-dev-ebb4c65869db7213280ad9c510637683939b5ff8.tar.xz linux-dev-ebb4c65869db7213280ad9c510637683939b5ff8.zip | |
[ARM] iop: iop3xx needs registers mapped uncached+unbuffered
Mikael Pettersson reported:
The 2.6.28-rc kernels fail to detect PCI device 0000:00:01.0
(the first ethernet port) on my Thecus n2100 XScale box.
There is however still a strange "ghost" device that gets partially
detected in 2.6.28-rc2 vanilla.
The IOP321 manual says:
The user designates the memory region containing the OCCDR as
non-cacheable and non-bufferable from the IntelR XScaleTM core.
This guarantees that all load/stores to the OCCDR are only of
DWORD quantities.
Ensure that the OCCDR is so mapped.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/plat-iop')
| -rw-r--r-- | arch/arm/plat-iop/setup.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/arm/plat-iop/setup.c b/arch/arm/plat-iop/setup.c index 4689db638e95..9e573e78176a 100644 --- a/arch/arm/plat-iop/setup.c +++ b/arch/arm/plat-iop/setup.c @@ -16,14 +16,15 @@ #include <asm/hardware/iop3xx.h> /* - * Standard IO mapping for all IOP3xx based systems + * Standard IO mapping for all IOP3xx based systems. Note that + * the IOP3xx OCCDR must be mapped uncached and unbuffered. */ static struct map_desc iop3xx_std_desc[] __initdata = { { /* mem mapped registers */ .virtual = IOP3XX_PERIPHERAL_VIRT_BASE, .pfn = __phys_to_pfn(IOP3XX_PERIPHERAL_PHYS_BASE), .length = IOP3XX_PERIPHERAL_SIZE, - .type = MT_DEVICE, + .type = MT_UNCACHED, }, { /* PCI IO space */ .virtual = IOP3XX_PCI_LOWER_IO_VA, .pfn = __phys_to_pfn(IOP3XX_PCI_LOWER_IO_PA), |