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authorAndrew Isaacson <adi@broadcom.com>2005-10-19 23:59:46 -0700
committerRalf Baechle <ralf@linux-mips.org>2005-10-29 19:32:49 +0100
commitcb4262481fce1d43ac9a483be4faf36fdd1c7abb (patch)
tree04e3614f81b2ac7b3091969427160de127f8d4c3 /arch/mips/pci
parent8a1417de9e11f9f577499cd4fe89fa35f4bf54fa (diff)
downloadop-kernel-dev-cb4262481fce1d43ac9a483be4faf36fdd1c7abb.zip
op-kernel-dev-cb4262481fce1d43ac9a483be4faf36fdd1c7abb.tar.gz
pci-expmem-hack
CFE 1.2.5 and earlier fails to turn on the ExpMemEn bit in the PCIFeatureControl register, which means that DMA does not work beyond physical address 01_0000_0000, ergo to DRAM beyond 1GB. With ExpMemEn turned on, 01_0000_0000-0f_ffff_ffff is mapped, so DMA works for up to 61 GB of DRAM. Will be fixed in CFE 1.2.6 (yet to be released). Signed-Off-By: Andy Isaacson <adi@broadcom.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/pci')
-rw-r--r--arch/mips/pci/pci-bcm1480.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/mips/pci/pci-bcm1480.c b/arch/mips/pci/pci-bcm1480.c
index 4905d85..f194b4e 100644
--- a/arch/mips/pci/pci-bcm1480.c
+++ b/arch/mips/pci/pci-bcm1480.c
@@ -232,6 +232,14 @@ static int __init bcm1480_pcibios_init(void)
bcm1480_bus_status |= PCI_BUS_ENABLED;
}
+ /* turn on ExpMemEn */
+ cmdreg = READCFG32(CFGOFFSET(0, PCI_DEVFN(PCI_BRIDGE_DEVICE, 0), 0x40));
+ printk("PCIFeatureCtrl = %x\n", cmdreg);
+ WRITECFG32(CFGOFFSET(0, PCI_DEVFN(PCI_BRIDGE_DEVICE, 0), 0x40),
+ cmdreg | 0x10);
+ cmdreg = READCFG32(CFGOFFSET(0, PCI_DEVFN(PCI_BRIDGE_DEVICE, 0), 0x40));
+ printk("PCIFeatureCtrl = %x\n", cmdreg);
+
/*
* Establish mappings in KSEG2 (kernel virtual) to PCI I/O
* space. Use "match bytes" policy to make everything look
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