[U-Boot] [PATCH 15/22] imx8m: Configure trustzone region 0 for non-secure access

[Peng Fan]

From: Ye Li <ye.li at nxp.com>

Set trustzone region 0 to allow both non-secure and secure access
when trust zone is enabled. We found USB controller fails to access
DDR if the default region 0 is secure access only.

Signed-off-by: Ye Li <ye.li at nxp.com>
Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
 arch/arm/mach-imx/imx8m/soc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/mach-imx/imx8m/soc.c b/arch/arm/mach-imx/imx8m/soc.c
index 261f586fc0..a33ca35653 100644
--- a/arch/arm/mach-imx/imx8m/soc.c
+++ b/arch/arm/mach-imx/imx8m/soc.c
@@ -57,6 +57,12 @@ void enable_tzc380(void)
 	setbits_le32(&gpr->gpr[10], GPR_TZASC_EN_LOCK);
 	if (IS_ENABLED(CONFIG_IMX8MM))
 		setbits_le32(&gpr->gpr[10], BIT(1));
+	/*
+	 * set Region 0 attribute to allow secure and non-secure
+	 * read/write permission. Found some masters like usb dwc3
+	 * controllers can't work with secure memory.
+	 */
+	writel(0xf0000000, TZASC_BASE_ADDR + 0x108);
 }
 
 void set_wdog_reset(struct wdog_regs *wdog)
-- 
2.16.4