+/* implementaion register bits */
+#define EJTAG_IMP_R3K (1 << 28)
+#define EJTAG_IMP_DINT (1 << 24)
+#define EJTAG_IMP_NODMA (1 << 14)
+#define EJTAG_IMP_MIPS16 (1 << 16)
+#define EJTAG_DCR_MIPS64 (1 << 0)
+
+/* Debug Control Register DCR */
+#define EJTAG_DCR 0xFF300000
+#define EJTAG_DCR_ENM (1 << 29)
+#define EJTAG_DCR_DB (1 << 17)
+#define EJTAG_DCR_IB (1 << 16)
+#define EJTAG_DCR_INTE (1 << 4)
+
+/* breakpoint support */
+#define EJTAG_IBS 0xFF301000
+#define EJTAG_IBA1 0xFF301100
+#define EJTAG_DBS 0xFF302000
+#define EJTAG_DBA1 0xFF302100
+#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)
+
+struct mips_ejtag {
+ struct jtag_tap *tap;
+ uint32_t impcode;
+ uint32_t idcode;
+ uint32_t ejtag_ctrl;
+ int fast_access_save;
+ uint32_t reg8;
+ uint32_t reg9;
+ unsigned scan_delay;
+ int mode;
+};
+
+void mips_ejtag_set_instr(struct mips_ejtag *ejtag_info,
+ int new_instr);
+int mips_ejtag_enter_debug(struct mips_ejtag *ejtag_info);
+int mips_ejtag_exit_debug(struct mips_ejtag *ejtag_info);
+int mips_ejtag_get_idcode(struct mips_ejtag *ejtag_info, uint32_t *idcode);
+void mips_ejtag_add_scan_96(struct mips_ejtag *ejtag_info,
+ uint32_t ctrl, uint32_t data, uint8_t *in_scan_buf);
+void mips_ejtag_drscan_32_out(struct mips_ejtag *ejtag_info, uint32_t data);
+int mips_ejtag_drscan_32(struct mips_ejtag *ejtag_info, uint32_t *data);
+void mips_ejtag_drscan_8_out(struct mips_ejtag *ejtag_info, uint8_t data);
+int mips_ejtag_drscan_8(struct mips_ejtag *ejtag_info, uint32_t *data);
+int mips_ejtag_fastdata_scan(struct mips_ejtag *ejtag_info, int write_t, uint32_t *data);
+
+int mips_ejtag_init(struct mips_ejtag *ejtag_info);
+int mips_ejtag_config_step(struct mips_ejtag *ejtag_info, int enable_step);
+
+static inline void mips_le_to_h_u32(jtag_callback_data_t arg)