aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/ipq40xx/patches-5.4/302-arm-compressed-set-ipq40xx-watchdog-to-allow-boot.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/ipq40xx/patches-5.4/302-arm-compressed-set-ipq40xx-watchdog-to-allow-boot.patch')
-rw-r--r--target/linux/ipq40xx/patches-5.4/302-arm-compressed-set-ipq40xx-watchdog-to-allow-boot.patch66
1 files changed, 66 insertions, 0 deletions
diff --git a/target/linux/ipq40xx/patches-5.4/302-arm-compressed-set-ipq40xx-watchdog-to-allow-boot.patch b/target/linux/ipq40xx/patches-5.4/302-arm-compressed-set-ipq40xx-watchdog-to-allow-boot.patch
new file mode 100644
index 0000000000..71618a40f2
--- /dev/null
+++ b/target/linux/ipq40xx/patches-5.4/302-arm-compressed-set-ipq40xx-watchdog-to-allow-boot.patch
@@ -0,0 +1,66 @@
+From 11d6a6128a5a07c429941afc202b6e62a19771be Mon Sep 17 00:00:00 2001
+From: John Thomson <git@johnthomson.fastmail.com.au>
+Date: Fri, 23 Oct 2020 19:42:36 +1000
+Subject: [PATCH 2/2] arm: compressed: set ipq40xx watchdog to allow boot
+
+For IPQ40XX systems where the SoC watchdog is activated before linux,
+the watchdog timer may be too small for linux to finish uncompress,
+boot, and watchdog management start.
+If the watchdog is enabled, set the timeout for it to 30 seconds.
+The functionality and offsets were copied from:
+drivers/watchdog/qcom-wdt.c qcom_wdt_set_timeout & qcom_wdt_start
+The watchdog memory address was taken from:
+arch/arm/boot/dts/qcom-ipq4019.dtsi
+
+This was required on Mikrotik IPQ40XX consumer hardware using Mikrotik's
+RouterBoot bootloader.
+
+Signed-off-by: John Thomson <git@johnthomson.fastmail.com.au>
+---
+ arch/arm/boot/compressed/head.S | 35 +++++++++++++++++++++++++++++++++
+ 1 file changed, 35 insertions(+)
+
+--- a/arch/arm/boot/compressed/head.S
++++ b/arch/arm/boot/compressed/head.S
+@@ -599,6 +599,41 @@ not_relocated: mov r0, #0
+ bic r4, r4, #1
+ blne cache_on
+
++/* Set the Qualcom IPQ40xx watchdog timeout to 30 seconds
++ * if it is enabled, so that there is time for kernel
++ * to decompress, boot, and take over the watchdog.
++ * data and functionality from drivers/watchdog/qcom-wdt.c
++ * address from arch/arm/boot/dts/qcom-ipq4019.dtsi
++ */
++#ifdef CONFIG_ARCH_IPQ40XX
++watchdog_set:
++ /* offsets:
++ * 0x04 reset (=1 resets countdown)
++ * 0x08 enable (=0 disables)
++ * 0x0c status (=1 when SoC was reset by watchdog)
++ * 0x10 bark (=timeout warning in ticks)
++ * 0x14 bite (=timeout reset in ticks)
++ * clock rate is 1<<15 hertz
++ */
++ .equ watchdog, 0x0b017000 @Store watchdog base address
++ movw r0, #:lower16:watchdog
++ movt r0, #:upper16:watchdog
++ ldr r1, [r0, #0x08] @Get enabled?
++ cmp r1, #1 @If not enabled, do not change
++ bne watchdog_finished
++ mov r1, #0
++ str r1, [r0, #0x08] @Disable the watchdog
++ mov r1, #1
++ str r1, [r0, #0x04] @Pet the watchdog
++ mov r1, #30 @30 seconds timeout
++ lsl r1, r1, #15 @converted to ticks
++ str r1, [r0, #0x10] @Set the bark timeout
++ str r1, [r0, #0x14] @Set the bite timeout
++ mov r1, #1
++ str r1, [r0, #0x08] @Enable the watchdog
++watchdog_finished:
++#endif /* CONFIG_ARCH_IPQ40XX */
++
+ /*
+ * The C runtime environment should now be setup sufficiently.
+ * Set up some pointers, and start decompressing.