OpenWrt – Rev 4
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From 57615e112aba6ae4c831d50e769c2c102f013686 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Tue, 7 Jun 2016 22:53:24 +0200
Subject: [PATCH 01/31] cache patch from OpenWRT
---
arch/arm/mm/cache-fa.S | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
--- a/arch/arm/mm/cache-fa.S
+++ b/arch/arm/mm/cache-fa.S
@@ -24,7 +24,8 @@
/*
* The size of one data cache line.
*/
-#define CACHE_DLINESIZE 16
+#define CACHE_DLINESIZE 16
+#define CACHE_DLINESHIFT 4
/*
* The total size of the data cache.
@@ -169,7 +170,17 @@ ENTRY(fa_flush_kern_dcache_area)
* - start - virtual start address
* - end - virtual end address
*/
+__flush_whole_dcache:
+ mcr p15, 0, r0, c7, c14, 0 @ clean/invalidate D cache
+ mov r0, #0
+ mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
+ mov pc, lr
+
fa_dma_inv_range:
+ sub r3, r1, r0 @ calculate total size
+ cmp r3, #CACHE_DLIMIT @ total size >= limit?
+ bhs __flush_whole_dcache @ flush whole D cache
+
tst r0, #CACHE_DLINESIZE - 1
bic r0, r0, #CACHE_DLINESIZE - 1
mcrne p15, 0, r0, c7, c14, 1 @ clean & invalidate D entry
@@ -193,6 +204,10 @@ fa_dma_inv_range:
* - end - virtual end address
*/
fa_dma_clean_range:
+ sub r3, r1, r0 @ calculate total size
+ cmp r3, #CACHE_DLIMIT @ total size >= limit?
+ bhs __flush_whole_dcache @ flush whole D cache
+
bic r0, r0, #CACHE_DLINESIZE - 1
1: mcr p15, 0, r0, c7, c10, 1 @ clean D entry
add r0, r0, #CACHE_DLINESIZE