[PATCH 18/18] ARM: vf610: PM: enable SNVS access

Stefan Agner
2016-03-10T02:18:12Z

Restore access to SNVS which seems to be done by the boot ROM
on normal boot. This is required for RTC wakeup not ending up
in a interrupt storm, since the SNVS RTC driver can not
acknowledge the wakeup alarm without write access.

Signed-off-by: Stefan Agner <stefan@agner.ch>
---
arch/arm/mach-imx/suspend-vf610.S | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/arch/arm/mach-imx/suspend-vf610.S b/arch/arm/mach-imx/suspend-vf610.S
index 09ad246..6df0622 100644
--- a/arch/arm/mach-imx/suspend-vf610.S
+++ b/arch/arm/mach-imx/suspend-vf610.S
@@ -429,6 +429,17 @@ ddrmc_initializing:
ldr r5, =0x0
str r5, [r11, #VF610_GPC_LPMR]

+ /* Enable SNVS */
+ ldr r3, [r0, #PM_INFO_VF610_CCM_P_OFFSET]
+ ldr r4, [r3, #VF610_CCM_CCGR6]
+ orr r4, r4, #0x0000C000
+ str r4, [r3, #VF610_CCM_CCGR6]
+
+ /* Enable SNVS access (RTC) */
+ ldr r11, =0x400a7000
+ ldr r4, =0x80000100
+ str r4, [r11, #0x4]
+
/* get physical resume address from pm_info. */
ldr lr, [r0, #PM_INFO_RESUME_ADDR_OFFSET]

--
2.7.2