mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 01:11:14 +00:00
67 lines
2.4 KiB
Diff
67 lines
2.4 KiB
Diff
|
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.
|