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watchdog: driver support for fsl-lsch2

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Support watchdog driver for fsl-lsch2. It's disabled in default.
If you want to use it, please enable CONFIG_IMX_WATCHDOG.
Define CONFIG_WATCHDOG_TIMEOUT_MSECS to set watchdog timeout.

Signed-off-by: Xiaoliang Yang <xiaoliang.yang_1@nxp.com>
This commit is contained in:
Xiaoliang Yang 2018-10-18 18:27:45 +08:00 committed by Stefano Babic
parent 4dcbccf794
commit 005c1cf888
3 changed files with 18 additions and 0 deletions
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9
arch/arm/cpu/armv8/fsl-layerscape/doc/README.lsch2
View file

@ -8,3 +8,12 @@ Freescale LayerScape with Chassis Generation 2
This architecture supports Freescale ARMv8 SoCs with Chassis generation 2,
for example LS1043A.
Watchdog support Overview
-------------------
Support watchdog driver for LSCH2. The driver is disabled in default.
You can enable it by setting CONFIG_IMX_WATCHDOG.
Use following config to set watchdog timeout, if this config is not defined,
the default timeout value is 128s which is the maximum. Set 10 seconds for
example:
#define CONFIG_WATCHDOG_TIMEOUT_MSECS 10000

2
drivers/watchdog/Makefile
View file

@ -7,6 +7,8 @@ obj-$(CONFIG_WDT_AT91) += at91sam9_wdt.o
obj-$(CONFIG_FTWDT010_WATCHDOG) += ftwdt010_wdt.o
ifneq (,$(filter $(SOC), mx25 mx31 mx35 mx5 mx6 mx7 vf610))
obj-y += imx_watchdog.o
else
obj-$(CONFIG_IMX_WATCHDOG) += imx_watchdog.o
endif
obj-$(CONFIG_S5P) += s5p_wdt.o
obj-$(CONFIG_XILINX_TB_WATCHDOG) += xilinx_tb_wdt.o

7
drivers/watchdog/imx_watchdog.c
View file

@ -8,6 +8,9 @@
#include <asm/io.h>
#include <watchdog.h>
#include <asm/arch/imx-regs.h>
#ifdef CONFIG_FSL_LSCH2
#include <asm/arch/immap_lsch2.h>
#endif
#include <fsl_wdog.h>
#ifdef CONFIG_IMX_WATCHDOG
@ -33,8 +36,12 @@ void hw_watchdog_init(void)
#define CONFIG_WATCHDOG_TIMEOUT_MSECS 128000
#endif
timeout = (CONFIG_WATCHDOG_TIMEOUT_MSECS / 500) - 1;
#ifdef CONFIG_FSL_LSCH2
writew((WCR_WDA | WCR_SRS | WCR_WDE) << 8 | timeout, &wdog->wcr);
#else
writew(WCR_WDZST | WCR_WDBG | WCR_WDE | WCR_WDT | WCR_SRS |
WCR_WDA | SET_WCR_WT(timeout), &wdog->wcr);
#endif /* CONFIG_FSL_LSCH2*/
hw_watchdog_reset();
}
#endif