[U-Boot] [PATCH v4] armv8/ls2080a: configure PMU's PCTBENR to enable WDT

[Yunhui Cui]

From: Yunhui Cui <yunhui.cui at nxp.com>

The SP805-WDT module on LS2080A and LS2085A, requires configuration
of PMU's PCTBENR register to enable watchdog counter decrement and
reset signal generation. In order not to affect the sp805wdt driver
frame, we enable the watchdog clk in advance.

Signed-off-by: Yunhui Cui <yunhui.cui at nxp.com>
---
 arch/arm/cpu/armv8/fsl-layerscape/cpu.c                | 15 +++++++++++++++
 arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h |  1 +
 2 files changed, 16 insertions(+)

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
index d939900..1ac1067 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
@@ -639,6 +639,10 @@ int timer_init(void)
 #ifdef CONFIG_FSL_LSCH3
 	u32 __iomem *cltbenr = (u32 *)CONFIG_SYS_FSL_PMU_CLTBENR;
 #endif
+#ifdef CONFIG_LS2080A
+	u32 __iomem *pctbenr = (u32 *)FSL_PMU_PCTBENR_OFFSET;
+	u32 pmu_val;
+#endif
 #ifdef COUNTER_FREQUENCY_REAL
 	unsigned long cntfrq = COUNTER_FREQUENCY_REAL;
 
@@ -653,6 +657,17 @@ int timer_init(void)
 	out_le32(cltbenr, 0xf);
 #endif
 
+#ifdef CONFIG_LS2080A
+/*
+ * In certain Layerscape SoCs, the clock for each core's
+ * has an enable bit in the PMU Physical Core Time Base Enable
+ * Register (PCTBENR), which allows the watchdog to operate.
+ */
+pmu_val = in_le32(pctbenr);
+pmu_val |= 0xff;
+out_le32(pctbenr, pmu_val);
+#endif
+
 	/* Enable clock for timer
 	 * This is a global setting.
 	 */
diff --git a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
index 1d3b336..ba3b94d 100644
--- a/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
+++ b/arch/arm/include/asm/arch-fsl-layerscape/immap_lsch3.h
@@ -26,6 +26,7 @@
 #define CONFIG_SYS_FSL_TIMER_ADDR		0x023d0000
 #define CONFIG_SYS_FSL_PMU_CLTBENR		(CONFIG_SYS_FSL_PMU_ADDR + \
 						 0x18A0)
+#define FSL_PMU_PCTBENR_OFFSET	(CONFIG_SYS_FSL_PMU_ADDR + 0x8A0)
 
 #define CONFIG_SYS_FSL_WRIOP1_ADDR		(CONFIG_SYS_IMMR + 0x7B80000)
 #define CONFIG_SYS_FSL_WRIOP1_MDIO1	(CONFIG_SYS_FSL_WRIOP1_ADDR + 0x16000)
-- 
2.1.0.27.g96db324