powerpc: Disable flush or invalidate dcache by range for some SoCs

Commit ac337168a unified functions to flush and invalidate dcache by
range. These two functions were no-op for SoCs other than 4xx and
MPC86xx. Adding these functions seemed to be correct but introduced
issues when the dcache is flushed. While the root cause is under
investigation, disable these functions for affected SoCs so various
drivers can work.

Signed-off-by: York Sun <york.sun@nxp.com>

diff --git a/arch/powerpc/lib/ppccache.S b/arch/powerpc/lib/ppccache.S
index b96dbc60e092598083e3d0fe0cbb4f6807a7fb0f..66cf02dbd04bce1abcb825ddcfabf6fb1f1781a9 100644 (file)
--- a/arch/powerpc/lib/ppccache.S
+++ b/arch/powerpc/lib/ppccache.S
@@ -65,6 +65,7 @@ ppcSync:
  * flush_dcache_range(unsigned long start, unsigned long stop)
  */
 _GLOBAL(flush_dcache_range)
+#if defined(CONFIG_4xx) || defined(CONFIG_MPC86xx)
        li      r5,L1_CACHE_BYTES-1
        andc    r3,r3,r5
        subf    r4,r3,r4
@@ -77,6 +78,7 @@ _GLOBAL(flush_dcache_range)
        addi    r3,r3,L1_CACHE_BYTES
        bdnz    1b
        sync                            /* wait for dcbst's to get to ram */
+#endif
        blr
 
 /*
@@ -87,6 +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)
        li      r5,L1_CACHE_BYTES-1
        andc    r3,r3,r5
        subf    r4,r3,r4
@@ -100,5 +103,6 @@ _GLOBAL(invalidate_dcache_range)
        addi    r3,r3,L1_CACHE_BYTES
        bdnz    1b
        sync                            /* wait for dcbi's to get to ram */
+#endif
        blr