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
  27 #ifndef JTAG_COMMANDS_H
  28 #define JTAG_COMMANDS_H
  29
  30 /**
  31  * The inferred type of a scan_command_s structure, indicating whether
  32  * the command has the host scan in from the device, the host scan out
  33  * to the device, or both.
  34  */
  35 enum scan_type {
  36         /** From device to host, */
  37         SCAN_IN = 1,
  38         /** From host to device, */
  39         SCAN_OUT = 2,
  40         /** Full-duplex scan. */
  41         SCAN_IO = 3
  42 };
  43
  44 /**
  45  * The scan_command provide a means of encapsulating a set of scan_field_s
  46  * structures that should be scanned in/out to the device.
  47  */
  48 struct scan_command {
  49         /** instruction/not data scan */
  50         bool ir_scan;
  51         /** number of fields in *fields array */
  52         int num_fields;
  53         /** pointer to an array of data scan fields */
  54         struct scan_field *fields;
  55         /** state in which JTAG commands should finish */
  56         tap_state_t end_state;
  57 };
  58
  59 struct statemove_command {
  60         /** state in which JTAG commands should finish */
  61         tap_state_t end_state;
  62 };
  63
  64 struct pathmove_command {
  65         /** number of states in *path */
  66         int num_states;
  67         /** states that have to be passed */
  68         tap_state_t *path;
  69 };
  70
  71 struct runtest_command {
  72         /** number of cycles to spend in Run-Test/Idle state */
  73         int num_cycles;
  74         /** state in which JTAG commands should finish */
  75         tap_state_t end_state;
  76 };
  77
  78
  79 struct stableclocks_command {
  80         /** number of clock cycles that should be sent */
  81         int num_cycles;
  82 };
  83
  84
  85 struct reset_command {
  86         /** Set TRST output: 0 = deassert, 1 = assert, -1 = no change */
  87         int trst;
  88         /** Set SRST output: 0 = deassert, 1 = assert, -1 = no change */
  89         int srst;
  90 };
  91
  92 struct end_state_command {
  93         /** state in which JTAG commands should finish */
  94         tap_state_t end_state;
  95 };
  96
  97 struct sleep_command {
  98         /** number of microseconds to sleep */
  99         uint32_t us;
 100 };
 101
 102 /**
 103  * Encapsulates a series of bits to be clocked out, affecting state
 104  * and mode of the interface.
 105  *
 106  * In JTAG mode these are clocked out on TMS, using TCK.  They may be
 107  * used for link resets, transitioning between JTAG and SWD modes, or
 108  * to implement JTAG state machine transitions (implementing pathmove
 109  * or statemove operations).
 110  *
 111  * In SWD mode these are clocked out on SWDIO, using SWCLK, and are
 112  * used for link resets and transitioning between SWD and JTAG modes.
 113  */
 114 struct tms_command {
 115         /** How many bits should be clocked out. */
 116         unsigned num_bits;
 117         /** The bits to clock out; the LSB is bit 0 of bits[0]. */
 118         const uint8_t *bits;
 119 };
 120
 121 /**
 122  * Defines a container type that hold a pointer to a JTAG command
 123  * structure of any defined type.
 124  */
 125 union jtag_command_container {
 126         struct scan_command *scan;
 127         struct statemove_command *statemove;
 128         struct pathmove_command *pathmove;
 129         struct runtest_command *runtest;
 130         struct stableclocks_command *stableclocks;
 131         struct reset_command *reset;
 132         struct end_state_command *end_state;
 133         struct sleep_command *sleep;
 134         struct tms_command *tms;
 135 };
 136
 137 /**
 138  * The type of the @c jtag_command_container contained by a
 139  * @c jtag_command_s structure.
 140  */
 141 enum jtag_command_type {
 142         JTAG_SCAN         = 1,
 143         /* JTAG_TLR_RESET's non-minidriver implementation is a
 144          * vestige from a statemove cmd. The statemove command
 145          * is obsolete and replaced by pathmove.
 146          *
 147          * pathmove does not support reset as one of it's states,
 148          * hence the need for an explicit statemove command.
 149          */
 150         JTAG_TLR_RESET    = 2,
 151         JTAG_RUNTEST      = 3,
 152         JTAG_RESET        = 4,
 153         JTAG_PATHMOVE     = 6,
 154         JTAG_SLEEP        = 7,
 155         JTAG_STABLECLOCKS = 8,
 156         JTAG_TMS          = 9,
 157 };
 158
 159 struct jtag_command {
 160         union jtag_command_container cmd;
 161         enum jtag_command_type type;
 162         struct jtag_command *next;
 163 };
 164
 165 /** The current queue of jtag_command_s structures. */
 166 extern struct jtag_command *jtag_command_queue;
 167
 168 void *cmd_queue_alloc(size_t size);
 169
 170 void jtag_queue_command(struct jtag_command *cmd);
 171 void jtag_command_queue_reset(void);
 172
 173 enum scan_type jtag_scan_type(const struct scan_command *cmd);
 174 int jtag_scan_size(const struct scan_command *cmd);
 175 int jtag_read_buffer(uint8_t *buffer, const struct scan_command *cmd);
 176 int jtag_build_buffer(const struct scan_command *cmd, uint8_t **buffer);
 177
 178 #endif /* JTAG_COMMANDS_H */