[PATCH 04/14] ARM: arria10: reset-manager: don't touch l4 wdog

[Steffen Trumtrar <s.trumtrar@pengutronix.de>]

Leave the L4 watchdog 0 running.
If a watchdog reset happens while booting, the bootrom attempts to load
the last valid bootloader identified by the initswlastld register.

As we now hang() in arria10-xload after 10 failed FPGA writing attempts,
we need the watchdog to trigger so that the bootrom can try to start the
next bootloader image as fallback.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
---
 arch/arm/mach-socfpga/arria10-reset-manager.c | 9 ++++++---
 arch/arm/mach-socfpga/arria10-xload.c         | 5 +++++
 include/mach/socfpga/generic.h                | 2 ++
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-socfpga/arria10-reset-manager.c b/arch/arm/mach-socfpga/arria10-reset-manager.c
index 05440cf903..6f209e7045 100644
--- a/arch/arm/mach-socfpga/arria10-reset-manager.c
+++ b/arch/arm/mach-socfpga/arria10-reset-manager.c
@@ -33,9 +33,13 @@ void arria10_reset_peripherals(void)
 	}
 
 	/* disable all components except the ECC_OCP and bootsource */
-	writel(0xffffffff, ARRIA10_RSTMGR_ADDR + ARRIA10_RSTMGR_PER1MODRST);
 	writel(~mask, ARRIA10_RSTMGR_ADDR + ARRIA10_RSTMGR_PER0MODRST);
 
+	mask = ARRIA10_RSTMGR_PER1MODRST_WATCHDOG0 |
+	       ARRIA10_RSTMGR_PER1MODRST_L4SYSTIMER0;
+	/* disable all components except L4 watchdog */
+	writel(~mask, ARRIA10_RSTMGR_ADDR + ARRIA10_RSTMGR_PER1MODRST);
+
 	mask = 0xffffffff;
 
 	if (src == BOOTSOURCE_MMC) {
@@ -65,8 +69,7 @@ void arria10_reset_deassert_dedicated_peripherals(void)
 
 	clrbits_le32(ARRIA10_RSTMGR_ADDR + ARRIA10_RSTMGR_PER0MODRST, mask);
 
-	mask = ARRIA10_RSTMGR_PER1MODRST_L4SYSTIMER0 |
-	       ARRIA10_RSTMGR_PER1MODRST_UART1 |
+	mask = ARRIA10_RSTMGR_PER1MODRST_UART1 |
 	       ARRIA10_RSTMGR_PER1MODRST_UART0;
 
 	clrbits_le32(ARRIA10_RSTMGR_ADDR + ARRIA10_RSTMGR_PER1MODRST, mask);
diff --git a/arch/arm/mach-socfpga/arria10-xload.c b/arch/arm/mach-socfpga/arria10-xload.c
index db3cc209ee..7b0d6f00fb 100644
--- a/arch/arm/mach-socfpga/arria10-xload.c
+++ b/arch/arm/mach-socfpga/arria10-xload.c
@@ -437,6 +437,11 @@ void arria10_start_image(int offset)
 	if (ret)
 		hang();
 
+	/* mark image in OCRAM as valid */
+	writel(ARRIA10_SYSMGR_ROM_INITSWSTATE_VALID, ARRIA10_SYSMGR_ROM_INITSWSTATE);
+
+	arria10_watchdog_disable();
+
 	bb = buf;
 
 	bb();
diff --git a/include/mach/socfpga/generic.h b/include/mach/socfpga/generic.h
index 6c359e2abb..1af086140f 100644
--- a/include/mach/socfpga/generic.h
+++ b/include/mach/socfpga/generic.h
@@ -85,6 +85,8 @@ static inline int arria10_device_init(struct arria10_mainpll_cfg *mainpll,
 {
 	return 0;
 }
+static void arria10_kick_l4wd0(void) {}
+static void arria10_watchdog_disable(void) {}
 #endif
 
 static inline void __udelay(unsigned us)

-- 
2.43.2