[U-Boot] [PATCH v2 1/2] watchdog: driver support for fsl-lsch2

[Xiaoliang Yang]

Support watchdog driver for fsl-lsch2. If you want to use it,
please enable CONFIG_IMX_WATCHDOG, and CONFIG_HW_WATCHDOG.
define CONFIG_WATCHDOG_TIMEOUT_MSECS to set watchdog timeout.

Signed-off-by: Xiaoliang Yang <xiaoliang.yang_1 at nxp.com>
---
 arch/arm/cpu/armv8/fsl-layerscape/doc/README.lsch2 |   10 ++++++++++
 drivers/watchdog/Kconfig                           |    6 ++++++
 drivers/watchdog/Makefile                          |    2 ++
 drivers/watchdog/imx_watchdog.c                    |   11 +++++++++++
 4 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/doc/README.lsch2 b/arch/arm/cpu/armv8/fsl-layerscape/doc/README.lsch2
index a6ef830..87b91eb 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/doc/README.lsch2
+++ b/arch/arm/cpu/armv8/fsl-layerscape/doc/README.lsch2
@@ -8,3 +8,13 @@ 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 Layerscape. Use following configs to enable it:
+    #define CONFIG_IMX_WATCHDOG
+    #define CONFIG_HW_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
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 148c6a0..a526afd 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -103,4 +103,10 @@ config WDT_CDNS
 	   Select this to enable Cadence watchdog timer, which can be found on some
 	   Xilinx Microzed Platform.
 
+config IMX_WATCHDOG
+	bool "IMX watchdog timer support"
+	help
+	   Select this to enable IMX watchdog timer, which can be found on
+	   some i.mx and fsl-lsch2 SoCs.
+
 endmenu
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index f405f51..159fc11 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -7,6 +7,8 @@ obj-$(CONFIG_AT91SAM9_WATCHDOG) += at91sam9_wdt.o
 obj-$(CONFIG_FTWDT010_WATCHDOG) += ftwdt010_wdt.o
 ifneq (,$(filter $(SOC), mx31 mx35 mx5 mx6 mx7 vf610))
 obj-y += imx_watchdog.o
+else
+obj-$(CONFIG_IMX_WATCHDOG) += imx_watchdog.o
 endif
 obj-$(CONFIG_S5P)               += s5p_wdt.o
 obj-$(CONFIG_XILINX_TB_WATCHDOG) += xilinx_tb_wdt.o
diff --git a/drivers/watchdog/imx_watchdog.c b/drivers/watchdog/imx_watchdog.c
index 3f826d1..3ad4e55 100644
--- a/drivers/watchdog/imx_watchdog.c
+++ b/drivers/watchdog/imx_watchdog.c
@@ -8,6 +8,13 @@
 #include <asm/io.h>
 #include <watchdog.h>
 #include <asm/arch/imx-regs.h>
+#ifdef CONFIG_FSL_LAYERSCAPE
+#ifdef CONFIG_FSL_LSCH3
+#include <asm/arch/immap_lsch3.h>
+#elif defined(CONFIG_FSL_LSCH2)
+#include <asm/arch/immap_lsch2.h>
+#endif
+#endif
 #include <fsl_wdog.h>
 
 #ifdef CONFIG_IMX_WATCHDOG
@@ -33,8 +40,12 @@ void hw_watchdog_init(void)
 #define CONFIG_WATCHDOG_TIMEOUT_MSECS 128000
 #endif
 	timeout = (CONFIG_WATCHDOG_TIMEOUT_MSECS / 500) - 1;
+#ifdef CONFIG_FSL_LAYERSCAPE
+	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_LAYERSCAPE*/
 	hw_watchdog_reset();
 }
 #endif
-- 
1.7.1