arm: mach-imx: imx8m: re-use SNVS init routine
Working with HAB on the i.MX8MP we've encountered a case where a board
that successfully authenticates u-boot when booting Linux subsequently
fails to properly bring up the RTC.
The RTC registers live in the low-power block of the Secure Non-Volatile
Storage (SNVS) block.
The root cause of the error has been traced to the HAB handing off the
SNVS-RTC in a state where HPCOMR::NPSWA_EN = 0 in other words where the
Non-Privileged Software Access Enable bit is zero.
Configure SNVS to allow unpriv access to SNVS LP for imx8m and imx8mp.
This commit generalizes 723f8359c1 ("imx: mx7: snvs: Add an SNVS init
routine") to also be used on i.MX8M SoCs, and was testeed on i.MX8MP.
Signed-off-by: Ian Ray <ian.ray@gehealthcare.com>
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index 0de207c..011cca5 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -294,4 +294,4 @@
obj-$(CONFIG_SPL_BOOTROM_SUPPORT) += spl_imx_romapi.o
obj-$(CONFIG_IMX8_ROMAPI) += romapi.o
-obj-$(CONFIG_MX7) += snvs.o
+obj-$(CONFIG_MX7)$(CONFIG_IMX8M) += snvs.o
diff --git a/arch/arm/mach-imx/imx8m/soc.c b/arch/arm/mach-imx/imx8m/soc.c
index 09a528a..9588b8b 100644
--- a/arch/arm/mach-imx/imx8m/soc.c
+++ b/arch/arm/mach-imx/imx8m/soc.c
@@ -34,6 +34,8 @@
#include <linux/bitfield.h>
#include <linux/sizes.h>
+#include "../snvs.h"
+
DECLARE_GLOBAL_DATA_PTR;
#if defined(CONFIG_IMX_HAB)
@@ -576,6 +578,8 @@
writel(SNVS_LPPGDR_INIT, SNVS_BASE_ADDR + SNVS_LPLVDR);
/* Clear interrupt status */
writel(0xffffffff, SNVS_BASE_ADDR + SNVS_LPSR);
+
+ init_snvs();
}
static void imx8m_setup_csu_tzasc(void)