[PATCH v2 1/2] zynqmp: Disable secure access for boot devices

[Sean Anderson]

Boot devices (QSPI, MMC, NAND, and Ethernet) use secure access for DMA
by default. As this causes problems when using the SMMU [1], configure
them for normal access instead.

[1] https://support.xilinx.com/s/article/72164

Signed-off-by: Sean Anderson <sean.anderson at linux.dev>
---

Changes in v2:
- Don't set reserved bits in AXI_RPRTCN, since QSPI doesn't use ARPROT

 arch/arm/mach-zynqmp/include/mach/hardware.h | 2 ++
 board/xilinx/zynqmp/zynqmp.c                 | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/arch/arm/mach-zynqmp/include/mach/hardware.h b/arch/arm/mach-zynqmp/include/mach/hardware.h
index 8cb6494e52c..f1514d6a869 100644
--- a/arch/arm/mach-zynqmp/include/mach/hardware.h
+++ b/arch/arm/mach-zynqmp/include/mach/hardware.h
@@ -63,6 +63,8 @@ struct crlapb_regs {
 
 #define crlapb_base ((struct crlapb_regs *)ZYNQMP_CRL_APB_BASEADDR)
 
+#define ZYNQMP_IOU_SECURE_SLCR 0xFF240000
+
 #define ZYNQMP_IOU_SCNTR_SECURE	0xFF260000
 #define ZYNQMP_IOU_SCNTR_COUNTER_CONTROL_REGISTER_EN	0x1
 #define ZYNQMP_IOU_SCNTR_COUNTER_CONTROL_REGISTER_HDBG	0x2
diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c
index e6331c0e4d8..56e3b36ca99 100644
--- a/board/xilinx/zynqmp/zynqmp.c
+++ b/board/xilinx/zynqmp/zynqmp.c
@@ -72,6 +72,10 @@ int __maybe_unused psu_uboot_init(void)
 	writel(ZYNQMP_PS_SYSMON_ANALOG_BUS_VAL,
 	       ZYNQMP_AMS_PS_SYSMON_ANALOG_BUS);
 
+	/* Disable secure access for boot devices */
+	writel(0x04920492, ZYNQMP_IOU_SECURE_SLCR);
+	writel(0x00920492, ZYNQMP_IOU_SECURE_SLCR + 4);
+
 	/* Delay is required for clocks to be propagated */
 	udelay(1000000);
 	
-- 
2.35.1.1320.gc452695387.dirty