Blackfin: don't attempt to flush on-chip L1 SRAM regions
Since the on-chip L1 regions are not cacheable, there is no point in
trying to flush/invalidate them. Plus, older Blackfin parts like to
trigger an exception (like BF533-0.3).
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/include/asm/cacheflush.h b/arch/blackfin/include/asm/cacheflush.h
index 77135b6..9a5b2c5 100644
--- a/arch/blackfin/include/asm/cacheflush.h
+++ b/arch/blackfin/include/asm/cacheflush.h
@@ -39,8 +39,13 @@
static inline void flush_icache_range(unsigned start, unsigned end)
{
-#if defined(CONFIG_BFIN_EXTMEM_WRITEBACK) || defined(CONFIG_BFIN_L2_WRITEBACK)
- blackfin_dcache_flush_range(start, end);
+#if defined(CONFIG_BFIN_EXTMEM_WRITEBACK)
+ if (end <= physical_mem_end)
+ blackfin_dcache_flush_range(start, end);
+#endif
+#if defined(CONFIG_BFIN_L2_WRITEBACK)
+ if (start >= L2_START && end <= L2_START + L2_LENGTH)
+ blackfin_dcache_flush_range(start, end);
#endif
/* Make sure all write buffers in the data side of the core
@@ -52,9 +57,17 @@
* the pipeline.
*/
SSYNC();
-#if defined(CONFIG_BFIN_ICACHE)
- blackfin_icache_flush_range(start, end);
- flush_icache_range_others(start, end);
+#if defined(CONFIG_BFIN_EXTMEM_ICACHEABLE)
+ if (end <= physical_mem_end) {
+ blackfin_icache_flush_range(start, end);
+ flush_icache_range_others(start, end);
+ }
+#endif
+#if defined(CONFIG_BFIN_L2_ICACHEABLE)
+ if (start >= L2_START && end <= L2_START + L2_LENGTH) {
+ blackfin_icache_flush_range(start, end);
+ flush_icache_range_others(start, end);
+ }
#endif
}