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arm: mmu: deal with peripheral mapping on msm7k

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Peripherals must be accessed as DEVICE NON-SHARED.
This commit is contained in:
Brian Swetland
2008-09-07 02:48:41 -07:00
parent 1c87cc2f79
commit eceda412f8
1 changed files with 13 additions and 1 deletions
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14
arch/arm/mmu.c
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@@ -47,12 +47,24 @@ void arm_mmu_map_section(addr_t paddr, addr_t vaddr, uint flags)
int index;
uint AP;
uint CB;
uint TEX = 0;
#if defined(PLATFORM_MSM7K)
if ((paddr >= 0x88000000) && (paddr < 0xD0000000)) {
/* peripherals in the 0x88000000 - 0xD0000000 range must
* be mapped as DEVICE NON-SHARED: TEX=2, C=0, B=0
*/
TEX = 2;
flags &= (~(MMU_FLAG_CACHED | MMU_FLAG_BUFFERED));
}
#endif
AP = (flags & MMU_FLAG_READWRITE) ? 0x3 : 0x2;
CB = ((flags & MMU_FLAG_CACHED) ? 0x2 : 0) | ((flags & MMU_FLAG_BUFFERED) ? 0x1 : 0);
index = vaddr / MB;
tt[index] = (paddr & ~(MB-1)) | (AP << 10) | (0<<5) | (CB << 2) | (2<<0); // section mapping
// section mapping
tt[index] = (paddr & ~(MB-1)) | (TEX << 12) | (AP << 10) | (0<<5) | (CB << 2) | (2<<0);
arm_invalidate_tlb();
}