[U-Boot,15/20] imx8m: Configure trustzone region 0 for non-secure access
diff mbox series

Message ID 20190128094807.26532-16-peng.fan@nxp.com
State Changes Requested
Delegated to: Stefano Babic
Headers show
Series
  • imx: add i.MX8MM support
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Commit Message

Peng Fan Jan. 28, 2019, 9:40 a.m. UTC
From: Ye Li <ye.li@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@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
 arch/arm/mach-imx/imx8m/soc.c | 6 ++++++
 1 file changed, 6 insertions(+)

Patch
diff mbox series

diff --git a/arch/arm/mach-imx/imx8m/soc.c b/arch/arm/mach-imx/imx8m/soc.c
index f4239d3357..98388003bc 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)