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arm/mach-bcm283x/mbox: Flush and invalidate dcache when using fw mailbox

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When using dcache the setup data for the mailbox must be actually written
into memory before calling into firmware. Thus flush and invalidate the
memory.

Signed-off-by: Alexander Stein <alexanders83@web.de>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Tested-by: Stephen Warren <swarren@wwwdotorg.org>
This commit is contained in:
Alexander Stein 2015-07-24 09:22:13 +02:00 committed by Tom Rini
parent 927753aeb9
commit 4342557fad
2 changed files with 12 additions and 0 deletions
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3
arch/arm/mach-bcm283x/include/mach/mbox.h
View file

@ -522,6 +522,9 @@ int bcm2835_mbox_call_raw(u32 chan, u32 send, u32 *recv);
* a termination value are expected to immediately follow the header in
* memory, as required by the property protocol.
*
* Each struct bcm2835_mbox_hdr passed must be allocated with
* ALLOC_CACHE_ALIGN_BUFFER(x, y, z) to ensure proper cache flush/invalidate.
*
* Returns 0 for success, any other value for error.
*/
int bcm2835_mbox_call_prop(u32 chan, struct bcm2835_mbox_hdr *buffer);

9
arch/arm/mach-bcm283x/mbox.c
View file

@ -111,9 +111,18 @@ int bcm2835_mbox_call_prop(u32 chan, struct bcm2835_mbox_hdr *buffer)
dump_buf(buffer);
#endif
flush_dcache_range((unsigned long)buffer,
(unsigned long)((void *)buffer +
roundup(buffer->buf_size, ARCH_DMA_MINALIGN)));
ret = bcm2835_mbox_call_raw(chan, phys_to_bus((u32)buffer), &rbuffer);
if (ret)
return ret;
invalidate_dcache_range((unsigned long)buffer,
(unsigned long)((void *)buffer +
roundup(buffer->buf_size, ARCH_DMA_MINALIGN)));
if (rbuffer != phys_to_bus((u32)buffer)) {
printf("mbox: Response buffer mismatch\n");
return -1;