imx: imx8ulp: Reconfigure MRC3 for SRAM0 access

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@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>

diff --git a/arch/arm/mach-imx/imx8ulp/rdc.c b/arch/arm/mach-imx/imx8ulp/rdc.c
index 86310ca0b873d9b29c2680c329ec91b056f39c3f..8db96c1886518db1dca440796836d29864bccfa2 100644 (file)
--- 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);