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bootcount: Fix misaligned cache operation

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1947c2d2a0 introduces cache line flushes for the bootcounter, but if
the start address is not aligned then the flush causes warnings of
the form:

  CACHE: Misaligned operation at range [4030b7fc, 4030b83c]

Align both the start and end of the buffer (possibly crossing multiple
lines).

Fixes: 1947c2d2a0 ("bootcount: flush after storing the bootcounter")
Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Acked-by: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Alex Kiernan 2018-07-25 11:45:58 +00:00 committed by Tom Rini
parent 1416e2d225
commit fe9805fc7f
1 changed files with 10 additions and 3 deletions
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13
drivers/bootcount/bootcount.c
View file

@ -11,16 +11,23 @@
__weak void bootcount_store(ulong a)
{
void *reg = (void *)CONFIG_SYS_BOOTCOUNT_ADDR;
uintptr_t flush_start = rounddown(CONFIG_SYS_BOOTCOUNT_ADDR,
CONFIG_SYS_CACHELINE_SIZE);
uintptr_t flush_end;
#if defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD)
raw_bootcount_store(reg, (BOOTCOUNT_MAGIC & 0xffff0000) | a);
flush_end = roundup(CONFIG_SYS_BOOTCOUNT_ADDR + 4,
CONFIG_SYS_CACHELINE_SIZE);
#else
raw_bootcount_store(reg, a);
raw_bootcount_store(reg + 4, BOOTCOUNT_MAGIC);
flush_end = roundup(CONFIG_SYS_BOOTCOUNT_ADDR + 8,
CONFIG_SYS_CACHELINE_SIZE);
#endif /* defined(CONFIG_SYS_BOOTCOUNT_SINGLEWORD */
flush_dcache_range(CONFIG_SYS_BOOTCOUNT_ADDR,
CONFIG_SYS_BOOTCOUNT_ADDR +
CONFIG_SYS_CACHELINE_SIZE);
flush_dcache_range(flush_start, flush_end);
}
__weak ulong bootcount_load(void)