fsl-ch3/lowlevel: TZPC and TZASC programming to configure non-secure accesses

This patch ensures that the TZPC (BP147) and TZASC-400 programming
happens for LS2085A SoC only when the desired config flags are
enabled and ensures that the TZPC programming is done to allow Non-secure
(NS) + secure (S) transactions only for DCGF registers.

The TZASC component is not present on LS2085A-Rev1, so the TZASC-400
config flag is turned OFF for now.

Signed-off-by: Bhupesh Sharma <bhupesh.sharma@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

1 files changed, 54 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv8/fsl-lsch3/lowlevel.S b/arch/arm/cpu/armv8/fsl-lsch3/lowlevel.S
index 2a88aab283..c2837876b1 100644
--- a/arch/arm/cpu/armv8/fsl-lsch3/lowlevel.S
+++ b/arch/arm/cpu/armv8/fsl-lsch3/lowlevel.S
@@ -42,6 +42,60 @@ ENTRY(lowlevel_init)
 	ldr	x0, =secondary_boot_func
 	blr	x0
 2:
+
+#ifdef CONFIG_FSL_TZPC_BP147
+	/* Set Non Secure access for all devices protected via TZPC */
+	ldr	x1, =TZPCDECPROT_0_SET_BASE /* Decode Protection-0 Set Reg */
+	orr	w0, w0, #1 << 3 /* DCFG_RESET is accessible from NS world */
+	str	w0, [x1]
+
+	isb
+	dsb	sy
+#endif
+
+#ifdef CONFIG_FSL_TZASC_400
+	/* Set TZASC so that:
+	 * a. We use only Region0 whose global secure write/read is EN
+	 * b. We use only Region0 whose NSAID write/read is EN
+	 *
+	 * NOTE: As per the CCSR map doc, TZASC 3 and TZASC 4 are just
+	 * 	 placeholders.
+	 */
+	ldr	x1, =TZASC_GATE_KEEPER(0)
+	ldr	x0, [x1]		/* Filter 0 Gate Keeper Register */
+	orr	x0, x0, #1 << 0		/* Set open_request for Filter 0 */
+	str	x0, [x1]
+
+	ldr	x1, =TZASC_GATE_KEEPER(1)
+	ldr	x0, [x1]		/* Filter 0 Gate Keeper Register */
+	orr	x0, x0, #1 << 0		/* Set open_request for Filter 0 */
+	str	x0, [x1]
+
+	ldr	x1, =TZASC_REGION_ATTRIBUTES_0(0)
+	ldr	x0, [x1]		/* Region-0 Attributes Register */
+	orr	x0, x0, #1 << 31	/* Set Sec global write en, Bit[31] */
+	orr	x0, x0, #1 << 30	/* Set Sec global read en, Bit[30] */
+	str	x0, [x1]
+
+	ldr	x1, =TZASC_REGION_ATTRIBUTES_0(1)
+	ldr	x0, [x1]		/* Region-1 Attributes Register */
+	orr	x0, x0, #1 << 31	/* Set Sec global write en, Bit[31] */
+	orr	x0, x0, #1 << 30	/* Set Sec global read en, Bit[30] */
+	str	x0, [x1]
+
+	ldr	x1, =TZASC_REGION_ID_ACCESS_0(0)
+	ldr	w0, [x1]		/* Region-0 Access Register */
+	mov	w0, #0xFFFFFFFF		/* Set nsaid_wr_en and nsaid_rd_en */
+	str	w0, [x1]
+
+	ldr	x1, =TZASC_REGION_ID_ACCESS_0(1)
+	ldr	w0, [x1]		/* Region-1 Attributes Register */
+	mov	w0, #0xFFFFFFFF		/* Set nsaid_wr_en and nsaid_rd_en */
+	str	w0, [x1]
+
+	isb
+	dsb	sy
+#endif
 	mov	lr, x29			/* Restore LR */
 	ret
 ENDPROC(lowlevel_init)