[U-Boot] [PATCH] powerpc: Enable flush and invalidate dcache by range for MPC85xx

[Tony O'Brien]

Commit ac337168a unified functions to flush and invalidate dcache by
range. These two functions were no-ops for SoCs other than 4xx and
MPC86xx. Adding these functions seemed to be correct but introduced
issues in some drivers when the dcache was flushed. While the root
cause was under investigation, these functions were disabled in
Commit cb1629f91a for affected SoCs, including the MPC85xx, to make
the various drivers work.

On the T208x USB stopped working after v2016.07 was pulled.  After
re-enabling the dcache functions for the MPC85xx it started working
again.  The USB and DPPA Ethernet drivers have been seen as
operational after this change but other drivers cannot be tested.

Reviewed-by: Chris Packham <chris.packham at alliedtelesis.co.nz>
Signed-off-by: Tony O'Brien <tony.obrien at alliedtelesis.co.nz>
Cc: Marek Vasut <marex at denx.de>
Cc: York Sun <york.sun at nxp.com>
---
The USB and Ethernet functionality has been tested on both the
T2080RDB and our own design but we don't have the hardware to test
any of the other drivers.  We will wait and see if it causes us any
issues with other drivers.
 arch/powerpc/lib/ppccache.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/lib/ppccache.S b/arch/powerpc/lib/ppccache.S
index 66cf02dbd0..ad28c7c369 100644
--- a/arch/powerpc/lib/ppccache.S
+++ b/arch/powerpc/lib/ppccache.S
@@ -65,7 +65,7 @@ ppcSync:
  * flush_dcache_range(unsigned long start, unsigned long stop)
  */
 _GLOBAL(flush_dcache_range)
-#if defined(CONFIG_4xx) || defined(CONFIG_MPC86xx)
+#if defined(CONFIG_4xx) || defined(CONFIG_MPC85xx) || defined(CONFIG_MPC86xx)
 	li	r5,L1_CACHE_BYTES-1
 	andc	r3,r3,r5
 	subf	r4,r3,r4
@@ -89,7 +89,7 @@ _GLOBAL(flush_dcache_range)
  * invalidate_dcache_range(unsigned long start, unsigned long stop)
  */
 _GLOBAL(invalidate_dcache_range)
-#if defined(CONFIG_4xx) || defined(CONFIG_MPC86xx)
+#if defined(CONFIG_4xx) || defined(CONFIG_MPC85xx) || defined(CONFIG_MPC86xx)
 	li	r5,L1_CACHE_BYTES-1
 	andc	r3,r3,r5
 	subf	r4,r3,r4
-- 
2.11.0