src/jtag/jtag.h

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifndef JTAG_H
  21 #define JTAG_H
  22
  23 #include "types.h"
  24 #include "binarybuffer.h"
  25
  26 #include "command.h"
  27
  28 #if 0
  29 #define _DEBUG_JTAG_IO_
  30 #endif
  31
  32 /* Tap States
  33  * TLR - Test-Logic-Reset, RTI - Run-Test/Idle,
  34  * SDS - Select-DR-Scan, CD - Capture-DR, SD - Shift-DR, E1D - Exit1-DR,
  35  * PD - Pause-DR, E2D - Exit2-DR, UD - Update-DR,
  36  * SIS - Select-IR-Scan, CI - Capture-IR, SI - Shift-IR, E1I - Exit1-IR,
  37  * PI - Pause-IR, E2I - Exit2-IR, UI - Update-IR
  38  */
  39 enum tap_state
  40 {
  41         TAP_TLR = 0x0, TAP_RTI = 0x8,
  42         TAP_SDS = 0x1, TAP_CD = 0x2, TAP_SD = 0x3, TAP_E1D = 0x4,
  43         TAP_PD = 0x5, TAP_E2D = 0x6, TAP_UD = 0x7,
  44         TAP_SIS = 0x9, TAP_CI = 0xa, TAP_SI = 0xb, TAP_E1I = 0xc,
  45         TAP_PI = 0xd, TAP_E2I = 0xe, TAP_UI = 0xf
  46 };
  47
  48 typedef struct tap_transition_s
  49 {
  50         enum tap_state high;
  51         enum tap_state low;
  52 } tap_transition_t;
  53
  54 extern char* tap_state_strings[16];
  55 extern int tap_move_map[16];    /* map 16 TAP states to 6 stable states */
  56 extern u8 tap_move[6][6];               /* value scanned to TMS to move from one of six stable states to another */
  57 extern tap_transition_t tap_transitions[16];    /* describe the TAP state diagram */
  58
  59 extern enum tap_state end_state;                /* finish DR scans in dr_end_state */
  60 extern enum tap_state cur_state;                /* current TAP state */
  61
  62 #define TAP_MOVE(from, to) tap_move[tap_move_map[from]][tap_move_map[to]]
  63
  64 typedef struct scan_field_s
  65 {
  66         int device;                     /* ordinal device number this instruction refers to */
  67         int num_bits;           /* number of bits this field specifies (up to 32) */
  68         u8 *out_value;          /* value to be scanned into the device */
  69         u8 *out_mask;           /* only masked bits care */
  70         u8 *in_value;           /* pointer to a 32-bit memory location to take data scanned out */
  71         u8 *in_check_value;             /* used to validate scan results */
  72         u8 *in_check_mask;              /* check specified bits against check_value */
  73         int (*in_handler)(u8 *in_value, void *priv);    /* process received buffer using this handler */
  74         void *in_handler_priv;  /* additional information for the in_handler */
  75 } scan_field_t;
  76
  77 enum scan_type
  78 {
  79         /* IN: from device to host, OUT: from host to device */
  80         SCAN_IN = 1, SCAN_OUT = 2, SCAN_IO = 3
  81 };
  82
  83 typedef struct scan_command_s
  84 {
  85         int ir_scan;    /* instruction/not data scan */
  86         int num_fields;         /* number of fields in *fields array */
  87         scan_field_t *fields;   /* pointer to an array of data scan fields */
  88         enum tap_state end_state;       /* TAP state in which JTAG commands should finish */
  89 } scan_command_t;
  90
  91 typedef struct statemove_command_s
  92 {
  93         enum tap_state end_state;       /* TAP state in which JTAG commands should finish */
  94 } statemove_command_t;
  95
  96 typedef struct pathmove_command_s
  97 {
  98         int num_states;                         /* number of states in *path */
  99         enum tap_state *path;           /* states that have to be passed */
 100 } pathmove_command_t;
 101
 102 typedef struct runtest_command_s
 103 {
 104         int num_cycles;         /* number of cycles that should be spent in Run-Test/Idle */
 105         enum tap_state end_state;       /* TAP state in which JTAG commands should finish */
 106 } runtest_command_t;
 107
 108 typedef struct reset_command_s
 109 {
 110         int trst;                       /* trst/srst 0: deassert, 1: assert, -1: don't change */
 111         int srst;
 112 } reset_command_t;
 113
 114 typedef struct end_state_command_s
 115 {
 116         enum tap_state end_state;       /* TAP state in which JTAG commands should finish */
 117 } end_state_command_t;
 118
 119 typedef struct sleep_command_s
 120 {
 121         u32 us;         /* number of microseconds to sleep */
 122 } sleep_command_t;
 123
 124 typedef union jtag_command_container_u
 125 {
 126         scan_command_t *scan;
 127         statemove_command_t *statemove;
 128         pathmove_command_t *pathmove;
 129         runtest_command_t *runtest;
 130         reset_command_t *reset;
 131         end_state_command_t *end_state;
 132         sleep_command_t *sleep;
 133 } jtag_command_container_t;
 134
 135 enum jtag_command_type
 136 {
 137         JTAG_SCAN = 1,
 138         JTAG_STATEMOVE = 2, JTAG_RUNTEST = 3,
 139         JTAG_RESET = 4, JTAG_END_STATE = 5,
 140         JTAG_PATHMOVE = 6, JTAG_SLEEP = 7
 141 };
 142
 143 typedef struct jtag_command_s
 144 {
 145         jtag_command_container_t cmd;
 146         enum jtag_command_type type;
 147         struct jtag_command_s *next;
 148 } jtag_command_t;
 149
 150 extern jtag_command_t *jtag_command_queue;
 151
 152 typedef struct jtag_device_s
 153 {
 154         int ir_length;          /* size of instruction register */
 155         u8 *expected;           /* Capture-IR expected value */
 156         u8 *expected_mask;      /* Capture-IR expected mask */
 157         u32 idcode;                     /* device identification code */
 158         u8 *cur_instr;          /* current instruction */
 159         int bypass;                     /* bypass register selected */
 160         struct jtag_device_s *next;
 161 } jtag_device_t;
 162
 163 extern jtag_device_t *jtag_devices;
 164 extern int jtag_num_devices;
 165 extern int jtag_ir_scan_size;
 166
 167 enum reset_line_mode
 168 {
 169         LINE_OPEN_DRAIN = 0x0,
 170         LINE_PUSH_PULL = 0x1,
 171 };
 172
 173 typedef struct jtag_interface_s
 174 {
 175         char* name;
 176
 177         /* queued command execution
 178          */
 179         int (*execute_queue)(void);
 180
 181         /* optional command support
 182          */
 183         int support_pathmove;
 184
 185         /* interface initalization
 186          */
 187         int (*speed)(int speed);
 188         int (*register_commands)(struct command_context_s *cmd_ctx);
 189         int (*init)(void);
 190         int (*quit)(void);
 191
 192 } jtag_interface_t;
 193
 194 enum jtag_event
 195 {
 196         JTAG_SRST_ASSERTED,
 197         JTAG_TRST_ASSERTED,
 198         JTAG_SRST_RELEASED,
 199         JTAG_TRST_RELEASED,
 200 };
 201
 202 extern char* jtag_event_strings[];
 203
 204 extern int jtag_trst;
 205 extern int jtag_srst;
 206
 207 typedef struct jtag_event_callback_s
 208 {
 209         int (*callback)(enum jtag_event event, void *priv);
 210         void *priv;
 211         struct jtag_event_callback_s *next;
 212 } jtag_event_callback_t;
 213
 214 extern jtag_event_callback_t *jtag_event_callbacks;
 215
 216 extern jtag_interface_t *jtag;  /* global pointer to configured JTAG interface */
 217 extern enum tap_state end_state;
 218 extern enum tap_state cur_state;
 219
 220 extern char* jtag_interface;
 221 extern int jtag_speed;
 222
 223 enum reset_types
 224 {
 225         RESET_NONE = 0x0,
 226         RESET_HAS_TRST = 0x1,
 227         RESET_HAS_SRST = 0x2,
 228         RESET_TRST_AND_SRST = 0x3,
 229         RESET_SRST_PULLS_TRST = 0x4,
 230         RESET_TRST_PULLS_SRST = 0x8,
 231         RESET_TRST_OPEN_DRAIN = 0x10,
 232         RESET_SRST_PUSH_PULL = 0x20,
 233 };
 234
 235 extern enum reset_types jtag_reset_config;
 236
 237 /* JTAG subsystem */
 238 extern int jtag_init(struct command_context_s *cmd_ctx);
 239 extern int jtag_register_commands(struct command_context_s *cmd_ctx);
 240
 241 /* JTAG interface */
 242 extern int jtag_add_ir_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
 243 extern int jtag_add_dr_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
 244 extern int jtag_add_plain_ir_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
 245 extern int jtag_add_plain_dr_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
 246 extern int jtag_add_statemove(enum tap_state endstate);
 247 extern int jtag_add_pathmove(int num_states, enum tap_state *path);
 248 extern int jtag_add_runtest(int num_cycles, enum tap_state endstate);
 249 extern int jtag_add_reset(int trst, int srst);
 250 extern int jtag_add_end_state(enum tap_state endstate);
 251 extern int jtag_add_sleep(u32 us);
 252 extern int jtag_execute_queue(void);
 253 extern int jtag_cancel_queue(void);
 254
 255 /* JTAG support functions */
 256 extern enum scan_type jtag_scan_type(scan_command_t *cmd);
 257 extern int jtag_scan_size(scan_command_t *cmd);
 258 extern int jtag_read_buffer(u8 *buffer, scan_command_t *cmd);
 259 extern int jtag_build_buffer(scan_command_t *cmd, u8 **buffer);
 260 extern jtag_device_t* jtag_get_device(int num);
 261 extern void jtag_sleep(u32 us);
 262 extern int jtag_call_event_callbacks(enum jtag_event event);
 263 extern int jtag_register_event_callback(int (*callback)(enum jtag_event event, void *priv), void *priv);
 264
 265 /* error codes
 266  * JTAG subsystem uses codes between -100 and -199 */
 267
 268 #define ERROR_JTAG_INIT_FAILED                  (-100)
 269 #define ERROR_JTAG_INVALID_INTERFACE    (-101)
 270 #define ERROR_JTAG_NOT_IMPLEMENTED              (-102)
 271 #define ERROR_JTAG_TRST_ASSERTED                (-103)
 272 #define ERROR_JTAG_QUEUE_FAILED                 (-104)
 273 #define ERROR_JTAG_RESET_WOULD_ASSERT_TRST              (-105)
 274 #define ERROR_JTAG_RESET_CANT_SRST                              (-106)
 275 #define ERROR_JTAG_DEVICE_ERROR                 (-107)
 276 #endif /* JTAG_H */