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   1 /*
   2  * Copyright (C) 2019, STMicroelectronics - All Rights Reserved
   3  * Author(s): Antonio Borneo <borneo.antonio@gmail.com> for STMicroelectronics
   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, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 /**
  20  * @file
  21  * Utilities to support in-circuit debuggers that provide APIs to access
  22  * directly ARM DAP, hiding the access to the underlining transport used
  23  * for the physical connection (either JTAG or SWD).
  24  * E.g. STMicroelectronics ST-Link/V2 (from version V2J24) and STLINK-V3.
  25  *
  26  * Single-DAP support only.
  27  *
  28  * For details, see "ARM IHI 0031A"
  29  * ARM Debug Interface v5 Architecture Specification
  30  *
  31  * FIXME: in JTAG mode, trst is not managed
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include "config.h"
  36 #endif
  37
  38 #include <jtag/interface.h>
  39 #include <jtag/tcl.h>
  40 #include <transport/transport.h>
  41
  42 COMMAND_HANDLER(dapdirect_jtag_empty_command)
  43 {
  44         LOG_DEBUG("dapdirect_jtag_empty_command(\"%s\")", CMD_NAME);
  45
  46         return ERROR_OK;
  47 }
  48
  49 COMMAND_HANDLER(dapdirect_jtag_reset_command)
  50 {
  51         enum reset_types jtag_reset_config = jtag_get_reset_config();
  52
  53         /*
  54          * in case the adapter has not already handled asserting srst
  55          * we will attempt it again
  56          */
  57         if (jtag_reset_config & RESET_CNCT_UNDER_SRST) {
  58                 if (jtag_reset_config & RESET_SRST_NO_GATING) {
  59                         adapter_assert_reset();
  60                         return ERROR_OK;
  61                 }
  62                 LOG_WARNING("\'srst_nogate\' reset_config option is required");
  63         }
  64         adapter_deassert_reset();
  65         return ERROR_OK;
  66 }
  67
  68 static const struct command_registration dapdirect_jtag_subcommand_handlers[] = {
  69         {
  70                 .name = "newtap",
  71                 .mode = COMMAND_CONFIG,
  72                 .jim_handler = jim_jtag_newtap,
  73                 .help = "declare a new TAP"
  74         },
  75         {
  76                 .name = "init",
  77                 .mode = COMMAND_ANY,
  78                 .handler = dapdirect_jtag_empty_command,
  79                 .usage = ""
  80         },
  81         {
  82                 .name = "arp_init",
  83                 .mode = COMMAND_ANY,
  84                 .handler = dapdirect_jtag_empty_command,
  85                 .usage = ""
  86         },
  87         {
  88                 .name = "arp_init-reset",
  89                 .mode = COMMAND_ANY,
  90                 .handler = dapdirect_jtag_reset_command,
  91                 .usage = ""
  92         },
  93         {
  94                 .name = "tapisenabled",
  95                 .mode = COMMAND_EXEC,
  96                 .jim_handler = jim_jtag_tap_enabler,
  97         },
  98         {
  99                 .name = "tapenable",
 100                 .mode = COMMAND_EXEC,
 101                 .jim_handler = jim_jtag_tap_enabler,
 102         },
 103         {
 104                 .name = "tapdisable",
 105                 .mode = COMMAND_EXEC,
 106                 .handler = dapdirect_jtag_empty_command,
 107                 .usage = "",
 108         },
 109         {
 110                 .name = "configure",
 111                 .mode = COMMAND_ANY,
 112                 .handler = dapdirect_jtag_empty_command,
 113                 .usage = "",
 114         },
 115         {
 116                 .name = "cget",
 117                 .mode = COMMAND_EXEC,
 118                 .jim_handler = jim_jtag_configure,
 119         },
 120         {
 121                 .name = "names",
 122                 .mode = COMMAND_ANY,
 123                 .handler = dapdirect_jtag_empty_command,
 124                 .usage = "",
 125         },
 126         COMMAND_REGISTRATION_DONE
 127 };
 128
 129 static const struct command_registration dapdirect_jtag_handlers[] = {
 130         {
 131                 .name = "jtag",
 132                 .mode = COMMAND_ANY,
 133                 .chain = dapdirect_jtag_subcommand_handlers,
 134                 .usage = "",
 135         },
 136         {
 137                 .name = "jtag_ntrst_delay",
 138                 .mode = COMMAND_ANY,
 139                 .handler = dapdirect_jtag_empty_command,
 140                 .usage = "",
 141         },
 142         COMMAND_REGISTRATION_DONE
 143 };
 144
 145 static const struct command_registration dapdirect_swd_subcommand_handlers[] = {
 146         {
 147                 .name = "newdap",
 148                 .mode = COMMAND_CONFIG,
 149                 .jim_handler = jim_jtag_newtap,
 150                 .help = "declare a new SWD DAP",
 151         },
 152         COMMAND_REGISTRATION_DONE
 153 };
 154
 155 static const struct command_registration dapdirect_swd_handlers[] = {
 156         {
 157                 .name = "swd",
 158                 .mode = COMMAND_ANY,
 159                 .help = "SWD command group",
 160                 .usage = "",
 161                 .chain = dapdirect_swd_subcommand_handlers,
 162         },
 163         COMMAND_REGISTRATION_DONE
 164 };
 165
 166 static int dapdirect_jtag_select(struct command_context *ctx)
 167 {
 168         LOG_DEBUG("dapdirect_jtag_select()");
 169
 170         return register_commands(ctx, NULL, dapdirect_jtag_handlers);
 171 }
 172
 173 static int dapdirect_swd_select(struct command_context *ctx)
 174 {
 175         LOG_DEBUG("dapdirect_swd_select()");
 176
 177         return register_commands(ctx, NULL, dapdirect_swd_handlers);
 178 }
 179
 180 static int dapdirect_init(struct command_context *ctx)
 181 {
 182         enum reset_types jtag_reset_config = jtag_get_reset_config();
 183
 184         LOG_DEBUG("dapdirect_init()");
 185
 186         if (jtag_reset_config & RESET_CNCT_UNDER_SRST) {
 187                 if (jtag_reset_config & RESET_SRST_NO_GATING)
 188                         adapter_assert_reset();
 189                 else
 190                         LOG_WARNING("\'srst_nogate\' reset_config option is required");
 191         } else
 192                 adapter_deassert_reset();
 193
 194         return ERROR_OK;
 195 }
 196
 197 static struct transport dapdirect_jtag_transport = {
 198         .name = "dapdirect_jtag",
 199         .select = dapdirect_jtag_select,
 200         .init = dapdirect_init,
 201 };
 202
 203 static struct transport dapdirect_swd_transport = {
 204         .name = "dapdirect_swd",
 205         .select = dapdirect_swd_select,
 206         .init = dapdirect_init,
 207 };
 208
 209 static void dapdirect_constructor(void) __attribute__((constructor));
 210 static void dapdirect_constructor(void)
 211 {
 212         transport_register(&dapdirect_jtag_transport);
 213         transport_register(&dapdirect_swd_transport);
 214 }
 215
 216 /**
 217  * Returns true if the current debug session
 218  * is using JTAG as its transport.
 219  */
 220 bool transport_is_dapdirect_jtag(void)
 221 {
 222         return get_current_transport() == &dapdirect_jtag_transport;
 223 }
 224
 225 /**
 226  * Returns true if the current debug session
 227  * is using SWD as its transport.
 228  */
 229 bool transport_is_dapdirect_swd(void)
 230 {
 231         return get_current_transport() == &dapdirect_swd_transport;
 232 }