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powerpc/fsl-booke: Fixup calc_cam_sz to support MMU v2

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The registers that describe size supported by TLB are different on MMU
v2 as well as we support power of two page sizes.  For now we continue
to assume that FSL variable size array supports all page sizes up to the
maximum one reported in TLB1PS.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Kumar Gala
2012-01-05 12:37:16 -06:00
committed by galak
parent cb41fa024e
commit f0b8b3417d
2 changed files with 13 additions and 5 deletions
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17
arch/powerpc/mm/fsl_booke_mmu.c
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@@ -149,12 +149,19 @@ static void settlbcam(int index, unsigned long virt, phys_addr_t phys,
unsigned long calc_cam_sz(unsigned long ram, unsigned long virt,
phys_addr_t phys)
{
unsigned int camsize = __ilog2(ram) & ~1U;
unsigned int align = __ffs(virt | phys) & ~1U;
unsigned long max_cam = (mfspr(SPRN_TLB1CFG) >> 16) & 0xf;
unsigned int camsize = __ilog2(ram);
unsigned int align = __ffs(virt | phys);
unsigned long max_cam;
/* Convert (4^max) kB to (2^max) bytes */
max_cam = max_cam * 2 + 10;
if ((mfspr(SPRN_MMUCFG) & MMUCFG_MAVN) == MMUCFG_MAVN_V1) {
/* Convert (4^max) kB to (2^max) bytes */
max_cam = ((mfspr(SPRN_TLB1CFG) >> 16) & 0xf) * 2 + 10;
camsize &= ~1U;
align &= ~1U;
} else {
/* Convert (2^max) kB to (2^max) bytes */
max_cam = __ilog2(mfspr(SPRN_TLB1PS)) + 10;
}
if (camsize > align)
camsize = align;