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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
This commit is contained in:
Samuel Holland 2019-12-29 16:12:12 -06:00 committed by André Przywara
parent edd8188d32
commit 506ffe50de
1 changed files with 2 additions and 2 deletions
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4
plat/allwinner/common/sunxi_security.c
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@ -39,8 +39,8 @@ void sunxi_security_setup(void)
/* 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);