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powerpc: fix pci window initialization to work with > 4GB DRAM 

The existing code has a few errors that need to be fixed in
order to support large RAM sizes.  Fix those, and add a
comment to make it clearer.

Signed-off-by: Becky Bruce <becky.bruce@freescale.com>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Becky Bruce 2008-10-27 16:09:42 -05:00 committed by Andrew Fleming-AFLEMING
parent 219542a1a6
commit cd42516242
1 changed files with 7 additions and 3 deletions
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10
drivers/pci/fsl_pci_init.c
View File

@ -87,16 +87,20 @@ int fsl_pci_setup_inbound_windows(struct pci_region *r)
}
#if defined(CONFIG_PHYS_64BIT) && defined(CONFIG_SYS_PCI_64BIT)
/*
* On 64-bit capable systems, set up a mapping for all of DRAM
* in high pci address space.
*/
pci_sz = 1ull << __ilog2_u64(gd->ram_size);
/* round up to the next largest power of two */
if (gd->ram_size > pci_sz)
sz = 1ull << (__ilog2_u64(gd->ram_size) + 1);
pci_sz = 1ull << (__ilog2_u64(gd->ram_size) + 1);
debug ("R64 bus_start: %llx phys_start: %llx size: %llx\n",
(u64)CONFIG_SYS_PCI_MEMORY_BUS,
(u64)CONFIG_SYS_PCI64_MEMORY_BUS,
(u64)CONFIG_SYS_PCI_MEMORY_PHYS,
(u64)pci_sz);
pci_set_region(r++,
CONFIG_SYS_PCI_MEMORY_BUS,
CONFIG_SYS_PCI64_MEMORY_BUS,
CONFIG_SYS_PCI_MEMORY_PHYS,
pci_sz,
PCI_REGION_MEM | PCI_REGION_MEMORY |