esirisc_jtag.h

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/* SPDX-License-Identifier: GPL-2.0-or-later */
 
/***************************************************************************
 *   Copyright (C) 2018 by Square, Inc.                                    *
 *   Steven Stallion <stallion@squareup.com>                               *
 *   James Zhao <hjz@squareup.com>                                         *
 ***************************************************************************/
 
#ifndef OPENOCD_TARGET_ESIRISC_JTAG_H
#define OPENOCD_TARGET_ESIRISC_JTAG_H
 
#include <helper/types.h>
#include <jtag/jtag.h>
 
/* TAP Instructions */
#define INSTR_IDCODE            0x8
#define INSTR_DEBUG             0x9
#define INSTR_BYPASS            0xf
#define INSTR_LENGTH            4
 
/* eSi-Debug Commands */
#define DEBUG_NOP               0x00
#define DEBUG_READ_BYTE         0x10
#define DEBUG_READ_HWORD        0x20
#define DEBUG_READ_WORD         0x30
#define DEBUG_WRITE_BYTE        0x60
#define DEBUG_WRITE_HWORD       0x70
#define DEBUG_WRITE_WORD        0x80
#define DEBUG_READ_REG          0xb0
#define DEBUG_WRITE_REG         0xc0
#define DEBUG_READ_CSR          0xd0
#define DEBUG_WRITE_CSR         0xe0
#define DEBUG_ENABLE_DEBUG      0xf0
#define DEBUG_DISABLE_DEBUG     0xf2
#define DEBUG_ASSERT_RESET      0xf4
#define DEBUG_DEASSERT_RESET    0xf6
#define DEBUG_BREAK             0xf8
#define DEBUG_CONTINUE          0xfa
#define DEBUG_FLUSH_CACHES      0xfc
 
/* Exception IDs */
#define EID_OVERFLOW            0x3d
#define EID_CANT_DEBUG          0x3e
#define EID_NONE                0x3f
 
/* Byte Stuffing */
#define STUFF_MARKER            0x55
#define PAD_BYTE                0xaa
 
struct esirisc_jtag {
    struct jtag_tap *tap;
    uint8_t status;
};
 
bool esirisc_jtag_is_debug_active(struct esirisc_jtag *jtag_info);
bool esirisc_jtag_is_stopped(struct esirisc_jtag *jtag_info);
 
int esirisc_jtag_read_byte(struct esirisc_jtag *jtag_info,
        uint32_t address, uint8_t *data);
int esirisc_jtag_read_hword(struct esirisc_jtag *jtag_info,
        uint32_t address, uint16_t *data);
int esirisc_jtag_read_word(struct esirisc_jtag *jtag_info,
        uint32_t address, uint32_t *data);
 
int esirisc_jtag_write_byte(struct esirisc_jtag *jtag_info,
        uint32_t address, uint8_t data);
int esirisc_jtag_write_hword(struct esirisc_jtag *jtag_info,
        uint32_t address, uint16_t data);
int esirisc_jtag_write_word(struct esirisc_jtag *jtag_info,
        uint32_t address, uint32_t data);
 
int esirisc_jtag_read_reg(struct esirisc_jtag *jtag_info,
        uint8_t reg, uint32_t *data);
int esirisc_jtag_write_reg(struct esirisc_jtag *jtag_info,
        uint8_t reg, uint32_t data);
 
int esirisc_jtag_read_csr(struct esirisc_jtag *jtag_info,
        uint8_t bank, uint8_t csr, uint32_t *data);
int esirisc_jtag_write_csr(struct esirisc_jtag *jtag_info,
        uint8_t bank, uint8_t csr, uint32_t data);
 
int esirisc_jtag_enable_debug(struct esirisc_jtag *jtag_info);
 
int esirisc_jtag_assert_reset(struct esirisc_jtag *jtag_info);
int esirisc_jtag_deassert_reset(struct esirisc_jtag *jtag_info);
 
int esirisc_jtag_break(struct esirisc_jtag *jtag_info);
int esirisc_jtag_continue(struct esirisc_jtag *jtag_info);
 
int esirisc_jtag_flush_caches(struct esirisc_jtag *jtag_info);
 
#endif /* OPENOCD_TARGET_ESIRISC_JTAG_H */