[PATCH v5 06/14] ARM: mvebu: Low level function to disable HW coherency support

[Gregory CLEMENT]

When going to deep idle we need to disable the SoC snooping (aka
hardware coherency support). Playing with the coherency fabric
requires to use assembly code to be sure that the compiler doesn't
reorder the instructions nor do wrong optimization.

Signed-off-by: Gregory CLEMENT <gregory.clement at free-electrons.com>
---
 arch/arm/mach-mvebu/coherency_ll.S | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/mach-mvebu/coherency_ll.S b/arch/arm/mach-mvebu/coherency_ll.S
index c7179a03891d..6e1b31fb1a94 100644
--- a/arch/arm/mach-mvebu/coherency_ll.S
+++ b/arch/arm/mach-mvebu/coherency_ll.S
@@ -102,6 +102,26 @@ ENTRY(ll_enable_coherency)
 	mov	pc, lr
 ENDPROC(ll_enable_coherency)
 
+ENTRY(ll_disable_coherency)
+	/*
+	 * r0 being untouched in ll_get_coherency_base and
+	 * ll_get_cpuid, we can use it to save lr modifing it with the
+	 * following bl
+	 */
+	mov r0, lr
+	bl	ll_get_coherency_base
+	bl	ll_get_cpuid
+	mov lr, r0
+	add	r0, r1, #ARMADA_XP_CFB_CTL_REG_OFFSET
+1:
+	ldrex	r2, [r0]
+	bic	r2, r2, r3
+	strex	r1, r2, [r0]
+	cmp	r1, #0
+	bne	1b
+	dsb
+	mov	pc, lr
+ENDPROC(ll_disable_coherency)
 
 	.align 2
 3:
-- 
1.8.1.2