271 lines
8.7 KiB
C
271 lines
8.7 KiB
C
/***************************************************************************
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* Copyright (C) 2005 by Dominic Rath *
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* Dominic.Rath@gmx.de *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#ifndef JTAG_H
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#define JTAG_H
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#include "types.h"
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#include "binarybuffer.h"
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#include "command.h"
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#if 0
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#define _DEBUG_JTAG_IO_
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#endif
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/* Tap States
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* TLR - Test-Logic-Reset, RTI - Run-Test/Idle,
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* SDS - Select-DR-Scan, CD - Capture-DR, SD - Shift-DR, E1D - Exit1-DR,
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* PD - Pause-DR, E2D - Exit2-DR, UD - Update-DR,
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* SIS - Select-IR-Scan, CI - Capture-IR, SI - Shift-IR, E1I - Exit1-IR,
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* PI - Pause-IR, E2I - Exit2-IR, UI - Update-IR
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*/
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enum tap_state
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{
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TAP_TLR = 0x0, TAP_RTI = 0x8,
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TAP_SDS = 0x1, TAP_CD = 0x2, TAP_SD = 0x3, TAP_E1D = 0x4,
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TAP_PD = 0x5, TAP_E2D = 0x6, TAP_UD = 0x7,
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TAP_SIS = 0x9, TAP_CI = 0xa, TAP_SI = 0xb, TAP_E1I = 0xc,
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TAP_PI = 0xd, TAP_E2I = 0xe, TAP_UI = 0xf
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};
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typedef struct tap_transition_s
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{
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enum tap_state high;
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enum tap_state low;
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} tap_transition_t;
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extern char* tap_state_strings[16];
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extern int tap_move_map[16]; /* map 16 TAP states to 6 stable states */
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extern u8 tap_move[6][6]; /* value scanned to TMS to move from one of six stable states to another */
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extern tap_transition_t tap_transitions[16]; /* describe the TAP state diagram */
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extern enum tap_state end_state; /* finish DR scans in dr_end_state */
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extern enum tap_state cur_state; /* current TAP state */
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#define TAP_MOVE(from, to) tap_move[tap_move_map[from]][tap_move_map[to]]
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typedef struct scan_field_s
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{
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int device; /* ordinal device number this instruction refers to */
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int num_bits; /* number of bits this field specifies (up to 32) */
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u8 *out_value; /* value to be scanned into the device */
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u8 *out_mask; /* only masked bits care */
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u8 *in_value; /* pointer to a 32-bit memory location to take data scanned out */
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u8 *in_check_value; /* used to validate scan results */
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u8 *in_check_mask; /* check specified bits against check_value */
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int (*in_handler)(u8 *in_value, void *priv); /* process received buffer using this handler */
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void *in_handler_priv; /* additional information for the in_handler */
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} scan_field_t;
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enum scan_type
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{
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/* IN: from device to host, OUT: from host to device */
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SCAN_IN = 1, SCAN_OUT = 2, SCAN_IO = 3
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};
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typedef struct scan_command_s
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{
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int ir_scan; /* instruction/not data scan */
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int num_fields; /* number of fields in *fields array */
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scan_field_t *fields; /* pointer to an array of data scan fields */
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enum tap_state end_state; /* TAP state in which JTAG commands should finish */
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} scan_command_t;
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typedef struct statemove_command_s
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{
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enum tap_state end_state; /* TAP state in which JTAG commands should finish */
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} statemove_command_t;
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typedef struct pathmove_command_s
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{
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int num_states; /* number of states in *path */
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enum tap_state *path; /* states that have to be passed */
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} pathmove_command_t;
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typedef struct runtest_command_s
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{
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int num_cycles; /* number of cycles that should be spent in Run-Test/Idle */
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enum tap_state end_state; /* TAP state in which JTAG commands should finish */
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} runtest_command_t;
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typedef struct reset_command_s
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{
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int trst; /* trst/srst 0: deassert, 1: assert, -1: don't change */
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int srst;
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} reset_command_t;
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typedef struct end_state_command_s
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{
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enum tap_state end_state; /* TAP state in which JTAG commands should finish */
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} end_state_command_t;
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typedef struct sleep_command_s
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{
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u32 us; /* number of microseconds to sleep */
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} sleep_command_t;
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typedef union jtag_command_container_u
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{
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scan_command_t *scan;
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statemove_command_t *statemove;
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pathmove_command_t *pathmove;
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runtest_command_t *runtest;
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reset_command_t *reset;
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end_state_command_t *end_state;
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sleep_command_t *sleep;
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} jtag_command_container_t;
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enum jtag_command_type
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{
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JTAG_SCAN = 1,
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JTAG_STATEMOVE = 2, JTAG_RUNTEST = 3,
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JTAG_RESET = 4, JTAG_END_STATE = 5,
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JTAG_PATHMOVE = 6, JTAG_SLEEP = 7
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};
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typedef struct jtag_command_s
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{
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jtag_command_container_t cmd;
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enum jtag_command_type type;
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struct jtag_command_s *next;
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} jtag_command_t;
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extern jtag_command_t *jtag_command_queue;
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typedef struct jtag_device_s
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{
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int ir_length; /* size of instruction register */
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u8 *expected; /* Capture-IR expected value */
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u8 *expected_mask; /* Capture-IR expected mask */
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u32 idcode; /* device identification code */
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u8 *cur_instr; /* current instruction */
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int bypass; /* bypass register selected */
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struct jtag_device_s *next;
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} jtag_device_t;
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extern jtag_device_t *jtag_devices;
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extern int jtag_num_devices;
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extern int jtag_ir_scan_size;
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enum reset_line_mode
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{
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LINE_OPEN_DRAIN = 0x0,
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LINE_PUSH_PULL = 0x1,
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};
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typedef struct jtag_interface_s
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{
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char* name;
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/* queued command execution
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*/
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int (*execute_queue)(void);
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/* optional command support
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*/
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int support_statemove;
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/* interface initalization
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*/
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int (*speed)(int speed);
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int (*register_commands)(struct command_context_s *cmd_ctx);
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int (*init)(void);
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int (*quit)(void);
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} jtag_interface_t;
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enum jtag_event
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{
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JTAG_SRST_ASSERTED,
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JTAG_TRST_ASSERTED,
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JTAG_SRST_RELEASED,
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JTAG_TRST_RELEASED,
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};
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typedef struct jtag_event_callback_s
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{
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int (*callback)(enum jtag_event event, void *priv);
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void *priv;
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struct jtag_event_callback_s *next;
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} jtag_event_callback_t;
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extern jtag_event_callback_t *jtag_event_callbacks;
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extern jtag_interface_t *jtag; /* global pointer to configured JTAG interface */
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extern enum tap_state end_state;
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extern enum tap_state cur_state;
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extern char* jtag_interface;
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extern int jtag_speed;
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enum reset_types
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{
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RESET_NONE = 0x0,
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RESET_HAS_TRST = 0x1,
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RESET_HAS_SRST = 0x2,
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RESET_TRST_AND_SRST = 0x3,
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RESET_SRST_PULLS_TRST = 0x4,
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RESET_TRST_PULLS_SRST = 0x8,
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RESET_TRST_OPEN_DRAIN = 0x10,
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RESET_SRST_PUSH_PULL = 0x20,
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};
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extern enum reset_types jtag_reset_config;
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/* JTAG subsystem */
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extern int jtag_init(struct command_context_s *cmd_ctx);
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extern int jtag_register_commands(struct command_context_s *cmd_ctx);
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/* JTAG interface */
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extern int jtag_add_ir_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
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extern int jtag_add_dr_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
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extern int jtag_add_plain_ir_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
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extern int jtag_add_plain_dr_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
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extern int jtag_add_statemove(enum tap_state endstate);
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extern int jtag_add_pathmove(int num_states, enum tap_state *path);
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extern int jtag_add_runtest(int num_cycles, enum tap_state endstate);
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extern int jtag_add_reset(int trst, int srst);
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extern int jtag_add_end_state(enum tap_state endstate);
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extern int jtag_add_sleep(u32 us);
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extern int jtag_execute_queue(void);
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extern int jtag_cancel_queue(void);
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/* JTAG support functions */
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extern enum scan_type jtag_scan_type(scan_command_t *cmd);
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extern int jtag_scan_size(scan_command_t *cmd);
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extern int jtag_read_buffer(u8 *buffer, scan_command_t *cmd);
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extern int jtag_build_buffer(scan_command_t *cmd, u8 **buffer);
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extern jtag_device_t* jtag_get_device(int num);
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extern void jtag_sleep(u32 us);
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extern int jtag_call_event_callbacks(enum jtag_event event);
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extern int jtag_register_event_callback(int (*callback)(enum jtag_event event, void *priv), void *priv);
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/* error codes
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* JTAG subsystem uses codes between -100 and -199 */
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#define ERROR_JTAG_INIT_FAILED (-100)
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#define ERROR_JTAG_INVALID_INTERFACE (-101)
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#define ERROR_JTAG_NOT_IMPLEMENTED (-102)
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#define ERROR_JTAG_TRST_ASSERTED (-103)
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#define ERROR_JTAG_QUEUE_FAILED (-104)
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#define ERROR_JTAG_RESET_WOULD_ASSERT_TRST (-105)
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#define ERROR_JTAG_RESET_CANT_SRST (-106)
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#endif /* JTAG_H */
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