4 files changed, 142 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/ls102xa/Makefile b/arch/arm/cpu/armv7/ls102xa/Makefile
index d82ce8d014..ae4f25dcd3 100644
--- a/arch/arm/cpu/armv7/ls102xa/Makefile
+++ b/arch/arm/cpu/armv7/ls102xa/Makefile
@@ -7,6 +7,7 @@
 obj-y	+= cpu.o
 obj-y	+= clock.o
 obj-y	+= timer.o
+obj-y	+= fsl_epu.o
 
 obj-$(CONFIG_OF_LIBFDT) += fdt.o
 obj-$(CONFIG_SYS_HAS_SERDES) += fsl_ls1_serdes.o ls102xa_serdes.o
diff --git a/arch/arm/cpu/armv7/ls102xa/cpu.c b/arch/arm/cpu/armv7/ls102xa/cpu.c
index b7dde45ed3..fae6c68efc 100644
--- a/arch/arm/cpu/armv7/ls102xa/cpu.c
+++ b/arch/arm/cpu/armv7/ls102xa/cpu.c
@@ -12,6 +12,8 @@
 #include <netdev.h>
 #include <fsl_esdhc.h>
 
+#include "fsl_epu.h"
+
 DECLARE_GLOBAL_DATA_PTR;
 
 #if defined(CONFIG_DISPLAY_CPUINFO)
@@ -101,3 +103,17 @@ int cpu_eth_init(bd_t *bis)
 
 	return 0;
 }
+
+int arch_cpu_init(void)
+{
+	void *epu_base = (void *)(CONFIG_SYS_DCSRBAR + EPU_BLOCK_OFFSET);
+
+	/*
+	 * After wakeup from deep sleep, Clear EPU registers
+	 * as early as possible to prevent from possible issue.
+	 * It's also safe to clear at normal boot.
+	 */
+	fsl_epu_clean(epu_base);
+
+	return 0;
+}
diff --git a/arch/arm/cpu/armv7/ls102xa/fsl_epu.c b/arch/arm/cpu/armv7/ls102xa/fsl_epu.c
new file mode 100644
index 0000000000..6212640d14
--- /dev/null
+++ b/arch/arm/cpu/armv7/ls102xa/fsl_epu.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+
+#include "fsl_epu.h"
+
+/**
+ * fsl_epu_clean - Clear EPU registers
+ */
+void fsl_epu_clean(void *epu_base)
+{
+	u32 offset;
+
+	/* follow the exact sequence to clear the registers */
+	/* Clear EPACRn */
+	for (offset = EPACR0; offset <= EPACR15; offset += EPACR_STRIDE)
+		out_be32(epu_base + offset, 0);
+
+	/* Clear EPEVTCRn */
+	for (offset = EPEVTCR0; offset <= EPEVTCR9; offset += EPEVTCR_STRIDE)
+		out_be32(epu_base + offset, 0);
+
+	/* Clear EPGCR */
+	out_be32(epu_base + EPGCR, 0);
+
+	/* Clear EPSMCRn */
+	for (offset = EPSMCR0; offset <= EPSMCR15; offset += EPSMCR_STRIDE)
+		out_be32(epu_base + offset, 0);
+
+	/* Clear EPCCRn */
+	for (offset = EPCCR0; offset <= EPCCR31; offset += EPCCR_STRIDE)
+		out_be32(epu_base + offset, 0);
+
+	/* Clear EPCMPRn */
+	for (offset = EPCMPR0; offset <= EPCMPR31; offset += EPCMPR_STRIDE)
+		out_be32(epu_base + offset, 0);
+
+	/* Clear EPCTRn */
+	for (offset = EPCTR0; offset <= EPCTR31; offset += EPCTR_STRIDE)
+		out_be32(epu_base + offset, 0);
+
+	/* Clear EPIMCRn */
+	for (offset = EPIMCR0; offset <= EPIMCR31; offset += EPIMCR_STRIDE)
+		out_be32(epu_base + offset, 0);
+
+	/* Clear EPXTRIGCRn */
+	out_be32(epu_base + EPXTRIGCR, 0);
+
+	/* Clear EPECRn */
+	for (offset = EPECR0; offset <= EPECR15; offset += EPECR_STRIDE)
+		out_be32(epu_base + offset, 0);
+}
diff --git a/arch/arm/cpu/armv7/ls102xa/fsl_epu.h b/arch/arm/cpu/armv7/ls102xa/fsl_epu.h
new file mode 100644
index 0000000000..d658aad2ea
--- /dev/null
+++ b/arch/arm/cpu/armv7/ls102xa/fsl_epu.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __FSL_EPU_H
+#define __FSL_EPU_H
+
+#include <asm/types.h>
+
+#define FSL_STRIDE_4B	4
+#define FSL_STRIDE_8B	8
+
+/* Block offsets */
+#define EPU_BLOCK_OFFSET	0x00000000
+
+/* EPGCR (Event Processor Global Control Register) */
+#define EPGCR		0x000
+
+/* EPEVTCR0-9 (Event Processor EVT Pin Control Registers) */
+#define EPEVTCR0	0x050
+#define EPEVTCR9	0x074
+#define EPEVTCR_STRIDE	FSL_STRIDE_4B
+
+/* EPXTRIGCR (Event Processor Crosstrigger Control Register) */
+#define EPXTRIGCR	0x090
+
+/* EPIMCR0-31 (Event Processor Input Mux Control Registers) */
+#define EPIMCR0		0x100
+#define EPIMCR31	0x17C
+#define EPIMCR_STRIDE	FSL_STRIDE_4B
+
+/* EPSMCR0-15 (Event Processor SCU Mux Control Registers) */
+#define EPSMCR0		0x200
+#define EPSMCR15	0x278
+#define EPSMCR_STRIDE	FSL_STRIDE_8B
+
+/* EPECR0-15 (Event Processor Event Control Registers) */
+#define EPECR0		0x300
+#define EPECR15		0x33C
+#define EPECR_STRIDE	FSL_STRIDE_4B
+
+/* EPACR0-15 (Event Processor Action Control Registers) */
+#define EPACR0		0x400
+#define EPACR15		0x43C
+#define EPACR_STRIDE	FSL_STRIDE_4B
+
+/* EPCCRi0-15 (Event Processor Counter Control Registers) */
+#define EPCCR0		0x800
+#define EPCCR15		0x83C
+#define EPCCR31		0x87C
+#define EPCCR_STRIDE	FSL_STRIDE_4B
+
+/* EPCMPR0-15 (Event Processor Counter Compare Registers) */
+#define EPCMPR0		0x900
+#define EPCMPR15	0x93C
+#define EPCMPR31	0x97C
+#define EPCMPR_STRIDE	FSL_STRIDE_4B
+
+/* EPCTR0-31 (Event Processor Counter Register) */
+#define EPCTR0		0xA00
+#define EPCTR31		0xA7C
+#define EPCTR_STRIDE	FSL_STRIDE_4B
+
+void fsl_epu_clean(void *epu_base);
+
+#endif