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arm: mach-imx: imx8m: re-use SNVS init routine

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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>
This commit is contained in:
Ian Ray 2024-11-08 16:03:55 +02:00 • committed by Fabio Estevam
parent d6893740c1
commit 28958998f6
2 changed files with 5 additions and 1 deletions
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2
arch/arm/mach-imx/Makefile
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@ -294,4 +294,4 @@ obj-$(CONFIG_ARCH_IMXRT) += imxrt/
obj-$(CONFIG_SPL_BOOTROM_SUPPORT) += spl_imx_romapi.o obj-$(CONFIG_SPL_BOOTROM_SUPPORT) += spl_imx_romapi.o
obj-$(CONFIG_IMX8_ROMAPI) += romapi.o obj-$(CONFIG_IMX8_ROMAPI) += romapi.o
obj-$(CONFIG_MX7) += snvs.o obj-$(CONFIG_MX7)$(CONFIG_IMX8M) += snvs.o

4
arch/arm/mach-imx/imx8m/soc.c
View file

@ -34,6 +34,8 @@
#include <linux/bitfield.h> #include <linux/bitfield.h>
#include <linux/sizes.h> #include <linux/sizes.h>
#include "../snvs.h"
DECLARE_GLOBAL_DATA_PTR; DECLARE_GLOBAL_DATA_PTR;
#if defined(CONFIG_IMX_HAB) #if defined(CONFIG_IMX_HAB)
@ -576,6 +578,8 @@ static void imx8m_setup_snvs(void)
writel(SNVS_LPPGDR_INIT, SNVS_BASE_ADDR + SNVS_LPLVDR); writel(SNVS_LPPGDR_INIT, SNVS_BASE_ADDR + SNVS_LPLVDR);
/* Clear interrupt status */ /* Clear interrupt status */
writel(0xffffffff, SNVS_BASE_ADDR + SNVS_LPSR); writel(0xffffffff, SNVS_BASE_ADDR + SNVS_LPSR);
init_snvs();
} }
static void imx8m_setup_csu_tzasc(void) static void imx8m_setup_csu_tzasc(void)