[PATCH 23/78] ARM: aarch64: cache: Add v8_inv_dcache_range

[Sascha Hauer]

implement v8_flush_dcache_range based on v8_inv_dcache_range. While
at it add a prototype for v8_inv_dcache_range.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 arch/arm/cpu/cache-armv8.S   | 19 +++++++++++++++++++
 arch/arm/include/asm/cache.h |  2 ++
 2 files changed, 21 insertions(+)

diff --git a/arch/arm/cpu/cache-armv8.S b/arch/arm/cpu/cache-armv8.S
index 82b2f81778..3e21b35913 100644
--- a/arch/arm/cpu/cache-armv8.S
+++ b/arch/arm/cpu/cache-armv8.S
@@ -148,6 +148,25 @@ ENTRY(v8_flush_dcache_range)
 	ret
 ENDPROC(v8_flush_dcache_range)
 
+.section .text.v8_inv_dcache_range
+ENTRY(v8_inv_dcache_range)
+	mrs	x3, ctr_el0
+	lsr	x3, x3, #16
+	and	x3, x3, #0xf
+	mov	x2, #4
+	lsl	x2, x2, x3		/* cache line size */
+
+	/* x2 <- minimal cache line size in cache system */
+	sub	x3, x2, #1
+	bic	x0, x0, x3
+1:	dc	ivac, x0	/* invalidate data or unified cache */
+	add	x0, x0, x2
+	cmp	x0, x1
+	b.lo	1b
+	dsb	sy
+	ret
+ENDPROC(v8_inv_dcache_range)
+
 /*
  * void v8_invalidate_icache_all(void)
  *
diff --git a/arch/arm/include/asm/cache.h b/arch/arm/include/asm/cache.h
index 406a9d5d99..503bf8a0f7 100644
--- a/arch/arm/include/asm/cache.h
+++ b/arch/arm/include/asm/cache.h
@@ -5,6 +5,8 @@
 extern void v8_invalidate_icache_all(void);
 void v8_flush_dcache_all(void);
 void v8_invalidate_dcache_all(void);
+void v8_flush_dcache_range(unsigned long start, unsigned long end);
+void v8_inv_dcache_range(unsigned long start, unsigned long end);
 #endif
 
 static inline void icache_invalidate(void)
-- 
2.16.1