+#define EJTAG_DCR_ENM (1 << 29)
+#define EJTAG_DCR_DB (1 << 17)
+#define EJTAG_DCR_IB (1 << 16)
+#define EJTAG_DCR_INTE (1 << 4)
+#define EJTAG_DCR_MP (1 << 2)
+
+/* breakpoint support */
+/* EJTAG_V20_* was tested on Broadcom BCM7401
+ * and may or will differ with other hardware. For example EZ4021-FC. */
+#define EJTAG_V20_IBS 0xFF300004
+#define EJTAG_V20_IBA0 0xFF300100
+#define EJTAG_V20_IBC_OFFS 0x4 /* IBC Offset */
+#define EJTAG_V20_IBM_OFFS 0x8
+#define EJTAG_V20_IBAn_STEP 0x10 /* Offset for next channel */
+#define EJTAG_V20_DBS 0xFF300008
+#define EJTAG_V20_DBA0 0xFF300200
+#define EJTAG_V20_DBC_OFFS 0x4
+#define EJTAG_V20_DBM_OFFS 0x8
+#define EJTAG_V20_DBV_OFFS 0xc
+#define EJTAG_V20_DBAn_STEP 0x10
+
+#define EJTAG_V25_IBS 0xFF301000
+#define EJTAG_V25_IBA0 0xFF301100
+#define EJTAG_V25_IBM_OFFS 0x8
+#define EJTAG_V25_IBASID_OFFS 0x10
+#define EJTAG_V25_IBC_OFFS 0x18
+#define EJTAG_V25_IBAn_STEP 0x100
+#define EJTAG_V25_DBS 0xFF302000
+#define EJTAG_V25_DBA0 0xFF302100
+#define EJTAG_V25_DBM_OFFS 0x8
+#define EJTAG_V25_DBASID_OFFS 0x10
+#define EJTAG_V25_DBC_OFFS 0x18
+#define EJTAG_V25_DBV_OFFS 0x20
+#define EJTAG_V25_DBAn_STEP 0x100
+
+#define EJTAG_DBCn_NOSB (1 << 13)
+#define EJTAG_DBCn_NOLB (1 << 12)
+#define EJTAG_DBCn_BLM_MASK 0xff
+#define EJTAG_DBCn_BLM_SHIFT 4
+#define EJTAG_DBCn_BE (1 << 0)
+
+#define EJTAG_VERSION_20 0
+#define EJTAG_VERSION_25 1
+#define EJTAG_VERSION_26 2
+#define EJTAG_VERSION_31 3
+#define EJTAG_VERSION_41 4
+#define EJTAG_VERSION_51 5
+
+/*
+ * Additional defines for MIPS64 EJTAG
+ */
+#define EJTAG64_DCR 0xFFFFFFFFFF300000ull
+#define EJTAG64_DCR_ENM (1llu << 29)
+#define EJTAG64_DCR_DB (1llu << 17)
+#define EJTAG64_DCR_IB (1llu << 16)
+#define EJTAG64_DCR_INTE (1llu << 4)
+#define EJTAG64_DCR_MP (1llu << 2)
+#define EJTAG64_V25_DBA0 0xFFFFFFFFFF302100ull
+#define EJTAG64_V25_DBS 0xFFFFFFFFFF302000ull
+#define EJTAG64_V25_IBA0 0xFFFFFFFFFF301100ull
+#define EJTAG64_V25_IBS 0xFFFFFFFFFF301000ull
+
+struct mips_ejtag {