nios2: flush_tlb_all use TLBMISC way auto-increment feature
Writes to TLBACC cause TLBMISC way to be incremented, which can be
used to iterate over ways in a set, then wrap back to zero ready for
the next set. This reduces register writes significantly.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
diff --git a/arch/nios2/mm/tlb.c b/arch/nios2/mm/tlb.c
index 58c16d3..2469f88 100644
--- a/arch/nios2/mm/tlb.c
+++ b/arch/nios2/mm/tlb.c
@@ -242,21 +242,20 @@ void flush_tlb_all(void)
unsigned long addr = 0;
unsigned int line;
unsigned int way;
- unsigned long org_misc, pid_misc, tlbmisc;
+ unsigned long org_misc, pid_misc;
/* remember pid/way until we return */
get_misc_and_pid(&org_misc, &pid_misc);
+ /* Start at way 0, way is auto-incremented after each TLBACC write */
+ WRCTL(CTL_TLBMISC, TLBMISC_WE);
+
/* Map each TLB entry to physcal address 0 with no-access and a
bad ptbase */
for (line = 0; line < cpuinfo.tlb_num_lines; line++) {
WRCTL(CTL_PTEADDR, pteaddr_invalid(addr));
-
- for (way = 0; way < cpuinfo.tlb_num_ways; way++) {
- tlbmisc = TLBMISC_WE | (way << TLBMISC_WAY_SHIFT);
- WRCTL(CTL_TLBMISC, tlbmisc);
+ for (way = 0; way < cpuinfo.tlb_num_ways; way++)
WRCTL(CTL_TLBACC, 0);
- }
addr += PAGE_SIZE;
}