src/jtag/commands.h

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   Copyright (C) 2009 Zachary T Welch                                    *
   9  *   zw@superlucidity.net                                                  *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program; if not, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  ***************************************************************************/
  26 #ifndef JTAG_COMMANDS_H
  27 #define JTAG_COMMANDS_H
  28
  29 #include "jtag.h"
  30
  31 /**
  32  * The inferred type of a scan_command_s structure, indicating whether
  33  * the command has the host scan in from the device, the host scan out
  34  * to the device, or both.
  35  */
  36 enum scan_type {
  37         /// From device to host,
  38         SCAN_IN = 1,
  39         /// From host to device,
  40         SCAN_OUT = 2,
  41         /// Full-duplex scan.
  42         SCAN_IO = 3
  43 };
  44
  45 /**
  46  * The scan_command provide a means of encapsulating a set of scan_field_s
  47  * structures that should be scanned in/out to the device.
  48  */
  49 struct scan_command {
  50         /// instruction/not data scan
  51         bool ir_scan;
  52         /// number of fields in *fields array
  53         int num_fields;
  54         /// pointer to an array of data scan fields
  55         struct scan_field* fields;
  56         /// state in which JTAG commands should finish
  57         tap_state_t end_state;
  58 };
  59
  60 struct statemove_command {
  61         /// state in which JTAG commands should finish
  62         tap_state_t end_state;
  63 };
  64
  65 struct pathmove_command {
  66         /// number of states in *path
  67         int num_states;
  68         /// states that have to be passed
  69         tap_state_t* path;
  70 };
  71
  72 struct runtest_command {
  73         /// number of cycles to spend in Run-Test/Idle state
  74         int num_cycles;
  75         /// state in which JTAG commands should finish
  76         tap_state_t end_state;
  77 };
  78
  79
  80 struct stableclocks_command {
  81         /// number of clock cycles that should be sent
  82         int num_cycles;
  83 };
  84
  85
  86 struct reset_command {
  87         /// Set TRST output: 0 = deassert, 1 = assert, -1 = no change
  88         int trst;
  89         /// Set SRST output: 0 = deassert, 1 = assert, -1 = no change
  90         int srst;
  91 };
  92
  93 struct end_state_command {
  94         /// state in which JTAG commands should finish
  95         tap_state_t end_state;
  96 };
  97
  98 struct sleep_command {
  99         /// number of microseconds to sleep
 100         uint32_t us;
 101 };
 102
 103 /**
 104  * Defines a container type that hold a pointer to a JTAG command
 105  * structure of any defined type.
 106  */
 107 union jtag_command_container {
 108         struct scan_command*         scan;
 109         struct statemove_command*    statemove;
 110         struct pathmove_command*     pathmove;
 111         struct runtest_command*      runtest;
 112         struct stableclocks_command* stableclocks;
 113         struct reset_command*        reset;
 114         struct end_state_command*    end_state;
 115         struct sleep_command* sleep;
 116 };
 117
 118 /**
 119  * The type of the @c jtag_command_container contained by a
 120  * @c jtag_command_s structure.
 121  */
 122 enum jtag_command_type {
 123         JTAG_SCAN         = 1,
 124         JTAG_STATEMOVE    = 2,
 125         JTAG_RUNTEST      = 3,
 126         JTAG_RESET        = 4,
 127         JTAG_PATHMOVE     = 6,
 128         JTAG_SLEEP        = 7,
 129         JTAG_STABLECLOCKS = 8
 130 };
 131
 132 struct jtag_command {
 133         union jtag_command_container cmd;
 134         enum jtag_command_type   type;
 135         struct jtag_command *next;
 136 };
 137
 138 /// The current queue of jtag_command_s structures.
 139 extern struct jtag_command* jtag_command_queue;
 140
 141 void* cmd_queue_alloc(size_t size);
 142 void cmd_queue_free(void);
 143
 144 void jtag_queue_command(struct jtag_command *cmd);
 145 void jtag_command_queue_reset(void);
 146
 147 enum scan_type jtag_scan_type(const struct scan_command* cmd);
 148 int jtag_scan_size(const struct scan_command* cmd);
 149 int jtag_read_buffer(uint8_t* buffer, const struct scan_command* cmd);
 150 int jtag_build_buffer(const struct scan_command* cmd, uint8_t** buffer);
 151
 152 #endif // JTAG_COMMANDS_H