[PATCH 09/23] imx: imx8ulp: Reconfigure MRC3 for SRAM0 access

[Ye Li]

Some space in SRAM0 will be protected by S400 to allow RX SecPriv mode
access only for boot purpose. Since SW will reuse the SRAM0 as SCMI
buffer and SPL container loading buffer, need to reconfigure MRC3.

Signed-off-by: Ye Li <ye.li at nxp.com>
Reviewed-by: Peng Fan <peng.fan at nxp.com>
---
 arch/arm/mach-imx/imx8ulp/rdc.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm/mach-imx/imx8ulp/rdc.c b/arch/arm/mach-imx/imx8ulp/rdc.c
index 8551bf6..472b13b 100644
--- a/arch/arm/mach-imx/imx8ulp/rdc.c
+++ b/arch/arm/mach-imx/imx8ulp/rdc.c
@@ -276,6 +276,21 @@ void xrdc_init_mda(void)
 
 void xrdc_init_mrc(void)
 {
+	/* Re-config MRC3 for SRAM0 in case protected by S400 */
+	xrdc_config_mrc_w0_w1(3, 0, 0x22010000, 0x10000);
+	xrdc_config_mrc_dx_perm(3, 0, 0, 1);
+	xrdc_config_mrc_dx_perm(3, 0, 1, 1);
+	xrdc_config_mrc_dx_perm(3, 0, 4, 1);
+	xrdc_config_mrc_dx_perm(3, 0, 5, 1);
+	xrdc_config_mrc_dx_perm(3, 0, 6, 1);
+	xrdc_config_mrc_dx_perm(3, 0, 7, 1);
+	xrdc_config_mrc_w3_w4(3, 0, 0x0, 0x80000FFF);
+
+	/* Clear other 3 regions of MRC3 to invalid */
+	xrdc_config_mrc_w3_w4(3, 1, 0x0, 0x0);
+	xrdc_config_mrc_w3_w4(3, 2, 0x0, 0x0);
+	xrdc_config_mrc_w3_w4(3, 3, 0x0, 0x0);
+
 	/* Set MRC4 and MRC5 for DDR access from A35 and AP NIC PER masters */
 	xrdc_config_mrc_w0_w1(4, 0, CFG_SYS_SDRAM_BASE, PHYS_SDRAM_SIZE);
 	xrdc_config_mrc_dx_perm(4, 0, 1, 1);
-- 
2.7.4