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authorLennert Buytenhek <buytenh@wantstofly.org>2005-11-07 21:12:09 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-11-07 21:12:09 +0000
commit5391473f7be88748ec248e0e70f1a4430a03eb52 (patch)
tree7a44812a4719b2ef7244add23125347251a23ec5
parentbedf142b8bba4331ed93161292a4ce4f8cde7308 (diff)
[ARM] 3121/1: unconditionally use XCB=101 on ixp2000
Patch from Lennert Buytenhek Since we have to use XCB=101 instead of XCB=000 on the ixp2400 to prevent it from regularly falling over, and since we have to deal with manual write buffer flushing because of that, we might as well use XCB=101 on all ixp2000 platforms since it's faster than XCB=000. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/mach-ixp2000/core.c35
1 files changed, 13 insertions, 22 deletions
diff --git a/arch/arm/mach-ixp2000/core.c b/arch/arm/mach-ixp2000/core.c
index df140962bb0..6851abaf552 100644
--- a/arch/arm/mach-ixp2000/core.c
+++ b/arch/arm/mach-ixp2000/core.c
@@ -84,63 +84,54 @@ static struct map_desc ixp2000_io_desc[] __initdata = {
.virtual = IXP2000_CAP_VIRT_BASE,
.pfn = __phys_to_pfn(IXP2000_CAP_PHYS_BASE),
.length = IXP2000_CAP_SIZE,
- .type = MT_DEVICE
+ .type = MT_IXP2000_DEVICE,
}, {
.virtual = IXP2000_INTCTL_VIRT_BASE,
.pfn = __phys_to_pfn(IXP2000_INTCTL_PHYS_BASE),
.length = IXP2000_INTCTL_SIZE,
- .type = MT_DEVICE
+ .type = MT_IXP2000_DEVICE,
}, {
.virtual = IXP2000_PCI_CREG_VIRT_BASE,
.pfn = __phys_to_pfn(IXP2000_PCI_CREG_PHYS_BASE),
.length = IXP2000_PCI_CREG_SIZE,
- .type = MT_DEVICE
+ .type = MT_IXP2000_DEVICE,
}, {
.virtual = IXP2000_PCI_CSR_VIRT_BASE,
.pfn = __phys_to_pfn(IXP2000_PCI_CSR_PHYS_BASE),
.length = IXP2000_PCI_CSR_SIZE,
- .type = MT_DEVICE
+ .type = MT_IXP2000_DEVICE,
}, {
.virtual = IXP2000_MSF_VIRT_BASE,
.pfn = __phys_to_pfn(IXP2000_MSF_PHYS_BASE),
.length = IXP2000_MSF_SIZE,
- .type = MT_DEVICE
+ .type = MT_IXP2000_DEVICE,
}, {
.virtual = IXP2000_PCI_IO_VIRT_BASE,
.pfn = __phys_to_pfn(IXP2000_PCI_IO_PHYS_BASE),
.length = IXP2000_PCI_IO_SIZE,
- .type = MT_DEVICE
+ .type = MT_IXP2000_DEVICE,
}, {
.virtual = IXP2000_PCI_CFG0_VIRT_BASE,
.pfn = __phys_to_pfn(IXP2000_PCI_CFG0_PHYS_BASE),
.length = IXP2000_PCI_CFG0_SIZE,
- .type = MT_DEVICE
+ .type = MT_IXP2000_DEVICE,
}, {
.virtual = IXP2000_PCI_CFG1_VIRT_BASE,
.pfn = __phys_to_pfn(IXP2000_PCI_CFG1_PHYS_BASE),
.length = IXP2000_PCI_CFG1_SIZE,
- .type = MT_DEVICE
+ .type = MT_IXP2000_DEVICE,
}
};
void __init ixp2000_map_io(void)
{
- extern unsigned int processor_id;
-
/*
- * On IXP2400 CPUs we need to use MT_IXP2000_DEVICE for
- * tweaking the PMDs so XCB=101. On IXP2800s we use the normal
- * PMD flags.
+ * On IXP2400 CPUs we need to use MT_IXP2000_DEVICE so that
+ * XCB=101 (to avoid triggering erratum #66), and given that
+ * this mode speeds up I/O accesses and we have write buffer
+ * flushes in the right places anyway, it doesn't hurt to use
+ * XCB=101 for all IXP2000s.
*/
- if ((processor_id & 0xfffffff0) == 0x69054190) {
- int i;
-
- printk(KERN_INFO "Enabling IXP2400 erratum #66 workaround\n");
-
- for(i=0;i<ARRAY_SIZE(ixp2000_io_desc);i++)
- ixp2000_io_desc[i].type = MT_IXP2000_DEVICE;
- }
-
iotable_init(ixp2000_io_desc, ARRAY_SIZE(ixp2000_io_desc));
/* Set slowport to 8-bit mode. */