From 4ccd111f807cca46043365078d2963120f6a5124 Mon Sep 17 00:00:00 2001 From: Sven Eckelmann Date: Wed, 18 Apr 2018 09:32:59 +0200 Subject: [PATCH] ARM: dts: ipq4019: Add TZ and SMEM reserved regions The QSEE (trustzone) is started on IPQ4019 before Linux is started. According to QCA, it is placed in in the the memory region 0x87e80000-0x88000000 and must not be accessed directly. There is an additional memory region 0x87e00000-0x87E80000 smem which which can be used for communication with the TZ. The driver for the latter is not yet ready but it is still not allowed to use this memory region like any other memory region. Not reserving this memory region either leads to kernel crashes, kernel hangs (often during the boot) or bus errors for userspace programs. The latter happens when a program is using a memory region which is mapped to these physical memory regions. [ 571.758058] Unhandled fault: imprecise external abort (0xc06) at 0x01715ff8 [ 571.758099] pgd = cebec000 [ 571.763826] [01715ff8] *pgd=8e7fa835, *pte=87e7f75f, *ppte=87e7fc7f Bus error Signed-off-by: Sven Eckelmann Signed-off-by: Andy Gross --- arch/arm/boot/dts/qcom-ipq4019.dtsi | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/arm/boot/dts/qcom-ipq4019.dtsi b/arch/arm/boot/dts/qcom-ipq4019.dtsi index 10d112a4078e..b25daf368012 100644 --- a/arch/arm/boot/dts/qcom-ipq4019.dtsi +++ b/arch/arm/boot/dts/qcom-ipq4019.dtsi @@ -23,6 +23,22 @@ compatible = "qcom,ipq4019"; interrupt-parent = <&intc>; + reserved-memory { + #address-cells = <0x1>; + #size-cells = <0x1>; + ranges; + + smem_region: smem@87e00000 { + reg = <0x87e00000 0x080000>; + no-map; + }; + + tz@87e80000 { + reg = <0x87e80000 0x180000>; + no-map; + }; + }; + aliases { spi0 = &spi_0; i2c0 = &i2c_0; -- 2.11.0