linux-kernel - [PATCH] ARM: mach-qcom: fix support for ipq806x

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Date:   Fri, 21 Oct 2022 20:10:16 +0200
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Russell King <linux@...linux.org.uk>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Arnd Bergmann <arnd@...db.de>,
        Ard Biesheuvel <ardb@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Nick Hawkins <nick.hawkins@....com>,
        John Crispin <john@...ozen.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Cc:     Christian Marangi <ansuelsmth@...il.com>
Subject: [PATCH] ARM: mach-qcom: fix support for ipq806x

Add a specific config flag for Qcom IPQ806x as this SoC can't use
AUTO_ZRELADDR and require the PHYS_OFFSET set to 0x42000000.

This is needed as some legacy board (or some wrongly configured
bootloader) pass the wrong memory map and doesn't exclude the first
~20MB of RAM reserved for the hardware network accellerators.

With this change we can correctly support each board and prevent any
kind of misconfiguration done by the OEM.

Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
---
 arch/arm/Kconfig           |  3 ++-
 arch/arm/mach-qcom/Kconfig | 13 +++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 1af63e17b4ad..0818d35973ad 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -282,6 +282,7 @@ config PHYS_OFFSET
 	default 0x30000000 if ARCH_S3C24XX
 	default 0xa0000000 if ARCH_IOP32X || ARCH_PXA
 	default 0xc0000000 if ARCH_EP93XX || ARCH_SA1100
+	default 0x42000000 if ARCH_IPQ806X
 	default 0
 	help
 	  Please provide the physical address corresponding to the
@@ -1701,7 +1702,7 @@ config CRASH_DUMP
 
 config AUTO_ZRELADDR
 	bool "Auto calculation of the decompressed kernel image address" if !ARCH_MULTIPLATFORM
-	default !(ARCH_FOOTBRIDGE || ARCH_RPC || ARCH_SA1100)
+	default !(ARCH_FOOTBRIDGE || ARCH_RPC || ARCH_SA1100 || ARCH_IPQ806X)
 	help
 	  ZRELADDR is the physical address where the decompressed kernel
 	  image will be placed. If AUTO_ZRELADDR is selected, the address
diff --git a/arch/arm/mach-qcom/Kconfig b/arch/arm/mach-qcom/Kconfig
index 12a812e61c16..b11b6e391ff0 100644
--- a/arch/arm/mach-qcom/Kconfig
+++ b/arch/arm/mach-qcom/Kconfig
@@ -46,4 +46,17 @@ config ARCH_MDM9615
 	bool "Enable support for MDM9615"
 	select CLKSRC_QCOM
 
+config ARCH_IPQ806X
+	bool "Enable support for IPQ806x"
+	help
+	  Enable support for the Qualcomm IPQ806x.
+
+	  IPQ806x require special PHYS_OFFSET and can't use AUTO_ZRELADDR.
+	  The first ~20MB of RAM is reserved for the hardware network accelerators,
+	  and the bootloader removes this section from the layout passed from the
+	  ATAGS (when used by some bootloader doesn't even do that).
+
+	  To support every system and handle legacy systems, hardcode PHYS_OFFSET and
+	  disable AUTO_ZRELADDR.
+
 endif
-- 
2.37.2