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   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2
   3 /*
   4  * Copyright (C) 2019, STMicroelectronics - All Rights Reserved
   5  * Author(s): Antonio Borneo <borneo.antonio@gmail.com> for STMicroelectronics
   6  */
   7
   8 /**
   9  * @file
  10  * Utilities to support in-circuit debuggers that provide APIs to access
  11  * directly ARM DAP, hiding the access to the underlining transport used
  12  * for the physical connection (either JTAG or SWD).
  13  * E.g. STMicroelectronics ST-Link/V2 (from version V2J24) and STLINK-V3.
  14  *
  15  * Single-DAP support only.
  16  *
  17  * For details, see "ARM IHI 0031A"
  18  * ARM Debug Interface v5 Architecture Specification
  19  *
  20  * FIXME: in JTAG mode, trst is not managed
  21  */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include <jtag/interface.h>
  28 #include <jtag/tcl.h>
  29 #include <transport/transport.h>
  30
  31 COMMAND_HANDLER(dapdirect_jtag_empty_command)
  32 {
  33         LOG_DEBUG("dapdirect_jtag_empty_command(\"%s\")", CMD_NAME);
  34
  35         return ERROR_OK;
  36 }
  37
  38 COMMAND_HANDLER(dapdirect_jtag_reset_command)
  39 {
  40         enum reset_types jtag_reset_config = jtag_get_reset_config();
  41
  42         /*
  43          * in case the adapter has not already handled asserting srst
  44          * we will attempt it again
  45          */
  46         if (jtag_reset_config & RESET_CNCT_UNDER_SRST) {
  47                 if (jtag_reset_config & RESET_SRST_NO_GATING) {
  48                         adapter_assert_reset();
  49                         return ERROR_OK;
  50                 }
  51                 LOG_WARNING("\'srst_nogate\' reset_config option is required");
  52         }
  53         adapter_deassert_reset();
  54         return ERROR_OK;
  55 }
  56
  57 static const struct command_registration dapdirect_jtag_subcommand_handlers[] = {
  58         {
  59                 .name = "newtap",
  60                 .mode = COMMAND_CONFIG,
  61                 .jim_handler = jim_jtag_newtap,
  62                 .help = "declare a new TAP"
  63         },
  64         {
  65                 .name = "init",
  66                 .mode = COMMAND_ANY,
  67                 .handler = dapdirect_jtag_empty_command,
  68                 .usage = ""
  69         },
  70         {
  71                 .name = "arp_init",
  72                 .mode = COMMAND_ANY,
  73                 .handler = dapdirect_jtag_empty_command,
  74                 .usage = ""
  75         },
  76         {
  77                 .name = "arp_init-reset",
  78                 .mode = COMMAND_ANY,
  79                 .handler = dapdirect_jtag_reset_command,
  80                 .usage = ""
  81         },
  82         {
  83                 .name = "tapisenabled",
  84                 .mode = COMMAND_EXEC,
  85                 .jim_handler = jim_jtag_tap_enabler,
  86         },
  87         {
  88                 .name = "tapenable",
  89                 .mode = COMMAND_EXEC,
  90                 .jim_handler = jim_jtag_tap_enabler,
  91         },
  92         {
  93                 .name = "tapdisable",
  94                 .mode = COMMAND_EXEC,
  95                 .handler = dapdirect_jtag_empty_command,
  96                 .usage = "",
  97         },
  98         {
  99                 .name = "configure",
 100                 .mode = COMMAND_ANY,
 101                 .handler = dapdirect_jtag_empty_command,
 102                 .usage = "",
 103         },
 104         {
 105                 .name = "cget",
 106                 .mode = COMMAND_EXEC,
 107                 .jim_handler = jim_jtag_configure,
 108         },
 109         {
 110                 .name = "names",
 111                 .mode = COMMAND_ANY,
 112                 .handler = dapdirect_jtag_empty_command,
 113                 .usage = "",
 114         },
 115         COMMAND_REGISTRATION_DONE
 116 };
 117
 118 static const struct command_registration dapdirect_jtag_handlers[] = {
 119         {
 120                 .name = "jtag",
 121                 .mode = COMMAND_ANY,
 122                 .chain = dapdirect_jtag_subcommand_handlers,
 123                 .usage = "",
 124         },
 125         {
 126                 .name = "jtag_ntrst_delay",
 127                 .mode = COMMAND_ANY,
 128                 .handler = dapdirect_jtag_empty_command,
 129                 .usage = "",
 130         },
 131         COMMAND_REGISTRATION_DONE
 132 };
 133
 134 static const struct command_registration dapdirect_swd_subcommand_handlers[] = {
 135         {
 136                 .name = "newdap",
 137                 .mode = COMMAND_CONFIG,
 138                 .jim_handler = jim_jtag_newtap,
 139                 .help = "declare a new SWD DAP",
 140         },
 141         COMMAND_REGISTRATION_DONE
 142 };
 143
 144 static const struct command_registration dapdirect_swd_handlers[] = {
 145         {
 146                 .name = "swd",
 147                 .mode = COMMAND_ANY,
 148                 .help = "SWD command group",
 149                 .usage = "",
 150                 .chain = dapdirect_swd_subcommand_handlers,
 151         },
 152         COMMAND_REGISTRATION_DONE
 153 };
 154
 155 static int dapdirect_jtag_select(struct command_context *ctx)
 156 {
 157         LOG_DEBUG("dapdirect_jtag_select()");
 158
 159         return register_commands(ctx, NULL, dapdirect_jtag_handlers);
 160 }
 161
 162 static int dapdirect_swd_select(struct command_context *ctx)
 163 {
 164         LOG_DEBUG("dapdirect_swd_select()");
 165
 166         return register_commands(ctx, NULL, dapdirect_swd_handlers);
 167 }
 168
 169 static int dapdirect_init(struct command_context *ctx)
 170 {
 171         enum reset_types jtag_reset_config = jtag_get_reset_config();
 172
 173         LOG_DEBUG("dapdirect_init()");
 174
 175         if (jtag_reset_config & RESET_CNCT_UNDER_SRST) {
 176                 if (jtag_reset_config & RESET_SRST_NO_GATING)
 177                         adapter_assert_reset();
 178                 else
 179                         LOG_WARNING("\'srst_nogate\' reset_config option is required");
 180         } else
 181                 adapter_deassert_reset();
 182
 183         return ERROR_OK;
 184 }
 185
 186 static struct transport dapdirect_jtag_transport = {
 187         .name = "dapdirect_jtag",
 188         .select = dapdirect_jtag_select,
 189         .init = dapdirect_init,
 190 };
 191
 192 static struct transport dapdirect_swd_transport = {
 193         .name = "dapdirect_swd",
 194         .select = dapdirect_swd_select,
 195         .init = dapdirect_init,
 196 };
 197
 198 static void dapdirect_constructor(void) __attribute__((constructor));
 199 static void dapdirect_constructor(void)
 200 {
 201         transport_register(&dapdirect_jtag_transport);
 202         transport_register(&dapdirect_swd_transport);
 203 }
 204
 205 /**
 206  * Returns true if the current debug session
 207  * is using JTAG as its transport.
 208  */
 209 bool transport_is_dapdirect_jtag(void)
 210 {
 211         return get_current_transport() == &dapdirect_jtag_transport;
 212 }
 213
 214 /**
 215  * Returns true if the current debug session
 216  * is using SWD as its transport.
 217  */
 218 bool transport_is_dapdirect_swd(void)
 219 {
 220         return get_current_transport() == &dapdirect_swd_transport;
 221 }