From: Arve Hjønnevåg <arve@android.com>
Date: Wed, 10 Jun 2009 03:17:45 +0000 (-0700)
Subject: [ARM] Optionally flush entire dcache from v6_dma_flush_range
X-Git-Tag: firefly_0821_release~11778
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3414e45fe081b2f7b89a2156e0b7eec26f77839b;p=firefly-linux-kernel-4.4.55.git

[ARM] Optionally flush entire dcache from v6_dma_flush_range

If CACHE_FLUSH_RANGE_LIMIT is defined, then the entire dcache will
be flushed if the requested range is larger than this limit.

Signed-off-by: Arve Hjønnevåg <arve@android.com>
---

diff --git a/arch/arm/mm/cache-v6.S b/arch/arm/mm/cache-v6.S
index 295e25dd6381..037cb2dc8cef 100644
--- a/arch/arm/mm/cache-v6.S
+++ b/arch/arm/mm/cache-v6.S
@@ -248,6 +248,11 @@ ENTRY(v6_dma_clean_range)
  *	- end     - virtual end address of region
  */
 ENTRY(v6_dma_flush_range)
+#ifdef CONFIG_CACHE_FLUSH_RANGE_LIMIT
+	sub	r2, r1, r0
+	cmp	r2, #CONFIG_CACHE_FLUSH_RANGE_LIMIT
+	bhi	v6_dma_flush_dcache_all
+#endif
 	bic	r0, r0, #D_CACHE_LINE_SIZE - 1
 1:
 #ifdef HARVARD_CACHE
@@ -262,6 +267,18 @@ ENTRY(v6_dma_flush_range)
 	mcr	p15, 0, r0, c7, c10, 4		@ drain write buffer
 	mov	pc, lr
 
+#ifdef CONFIG_CACHE_FLUSH_RANGE_LIMIT
+v6_dma_flush_dcache_all:
+	mov	r0, #0
+#ifdef HARVARD_CACHE
+	mcr	p15, 0, r0, c7, c14, 0		@ D cache clean+invalidate
+#else
+	mcr	p15, 0, r0, c7, c15, 0		@ Cache clean+invalidate
+#endif
+	mcr	p15, 0, r0, c7, c10, 4		@ drain write buffer
+	mov	pc, lr
+#endif
+
 	__INITDATA
 
 	.type	v6_cache_fns, #object