[U-Boot] [i.MX8MM+CCF 33/41] imx8m: Configure trustzone region 0 for non-secure access

Peng Fan
2019-04-30T10:19:28Z

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(+)

diff --git a/arch/arm/mach-imx/imx8m/soc.c b/arch/arm/mach-imx/imx8m/soc.c
index 3918578399..abf526bc68 100644
--- a/arch/arm/mach-imx/imx8m/soc.c
+++ b/arch/arm/mach-imx/imx8m/soc.c
@@ -61,6 +61,12 @@ 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