diff options
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.patch | 66 |
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. |