From ebb4c65869db7213280ad9c510637683939b5ff8 Mon Sep 17 00:00:00 2001 From: Russell King Date: Sun, 9 Nov 2008 11:18:36 +0000 Subject: [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 --- arch/arm/plat-iop/setup.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'arch/arm/plat-iop') diff --git a/arch/arm/plat-iop/setup.c b/arch/arm/plat-iop/setup.c index 4689db638e9..9e573e78176 100644 --- a/arch/arm/plat-iop/setup.c +++ b/arch/arm/plat-iop/setup.c @@ -16,14 +16,15 @@ #include /* - * 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), -- cgit v1.2.3