allwinner: Disable NS access to PRCM power control registers
The non-secure world has no business accessing the CPU power switches in
the PRCM; those are handled by TF-A or the SCP. Only allow access to the
clock control part of the PRCM.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Change-Id: I657b97f4ea8a0073448ad3343fbc66ba168ed89e
diff --git a/plat/allwinner/common/sunxi_security.c b/plat/allwinner/common/sunxi_security.c
index 1f16a0b..92c83b0 100644
--- a/plat/allwinner/common/sunxi_security.c
+++ b/plat/allwinner/common/sunxi_security.c
@@ -39,8 +39,8 @@
/* set MBUS clocks, bus clocks (AXI/AHB/APB) and PLLs to non-secure */
mmio_write_32(SUNXI_CCU_SEC_SWITCH_REG, 0x7);
- /* set R_PRCM clocks to non-secure */
- mmio_write_32(SUNXI_R_PRCM_BASE + R_PRCM_SEC_SWITCH_REG, 0x7);
+ /* Set R_PRCM bus clocks to non-secure */
+ mmio_write_32(SUNXI_R_PRCM_BASE + R_PRCM_SEC_SWITCH_REG, 0x1);
/* Set all DMA channels (16 max.) to non-secure */
mmio_write_32(SUNXI_DMA_BASE + DMA_SEC_REG, 0xffff);