src/target/feroceon.c

   1 /***************************************************************************
   2  *   Copyright (C) 2008 by Marvell Semiconductors, Inc.                    *
   3  *   Written by Nicolas Pitre <nico@marvell.com>                           *
   4  *                                                                         *
   5  *   Copyright (C) 2008 by Hongtao Zheng                                   *
   6  *   hontor@126.com                                                        *
   7  *                                                                         *
   8  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program; if not, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  22  ***************************************************************************/
  23
  24 /*
  25  * Marvell Feroceon support, including Orion and Kirkwood SOCs.
  26  *
  27  * The Feroceon core mimics the ARM926 ICE interface with the following
  28  * differences:
  29  *
  30  * - the MOE (method of entry) reporting is not implemented
  31  *
  32  * - breakpoint/watchpoint comparator #1 is seemingly not implemented
  33  *
  34  * - due to a different pipeline implementation, some injected debug
  35  *   instruction sequences have to be somewhat different
  36  *
  37  * Other issues:
  38  *
  39  * - asserting DBGRQ doesn't work if target is looping on the undef vector
  40  *
  41  * - the EICE version signature in the COMMS_CTL reg is next to the flow bits
  42  *   not at the top, and rather meaningless due to existing discrepencies
  43  *
  44  * - the DCC channel is half duplex (only one FIFO for both directions) with
  45  *   seemingly no proper flow control.
  46  */
  47
  48 #ifdef HAVE_CONFIG_H
  49 #include "config.h"
  50 #endif
  51
  52 #include "arm926ejs.h"
  53 #include "target_type.h"
  54
  55
  56 int feroceon_examine(struct target_s *target);
  57 int feroceon_target_create(struct target_s *target, Jim_Interp *interp);
  58 int feroceon_bulk_write_memory(target_t *target, uint32_t address, uint32_t count, uint8_t *buffer);
  59 int feroceon_init_target(struct command_context_s *cmd_ctx, struct target_s *target);
  60 int feroceon_quit(void);
  61
  62 int feroceon_assert_reset(target_t *target)
  63 {
  64         armv4_5_common_t *armv4_5 = target->arch_info;
  65         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
  66         int ud = arm7_9->use_dbgrq;
  67
  68         arm7_9->use_dbgrq = 0;
  69         if (target->reset_halt)
  70                 arm7_9_halt(target);
  71         arm7_9->use_dbgrq = ud;
  72         return arm7_9_assert_reset(target);
  73 }
  74
  75 target_type_t feroceon_target =
  76 {
  77         .name = "feroceon",
  78
  79         .poll = arm7_9_poll,
  80         .arch_state = arm926ejs_arch_state,
  81
  82         .target_request_data = arm7_9_target_request_data,
  83
  84         .halt = arm7_9_halt,
  85         .resume = arm7_9_resume,
  86         .step = arm7_9_step,
  87
  88         .assert_reset = feroceon_assert_reset,
  89         .deassert_reset = arm7_9_deassert_reset,
  90         .soft_reset_halt = arm926ejs_soft_reset_halt,
  91
  92         .get_gdb_reg_list = armv4_5_get_gdb_reg_list,
  93
  94         .read_memory = arm7_9_read_memory,
  95         .write_memory = arm926ejs_write_memory,
  96         .bulk_write_memory = feroceon_bulk_write_memory,
  97         .checksum_memory = arm7_9_checksum_memory,
  98         .blank_check_memory = arm7_9_blank_check_memory,
  99
 100         .run_algorithm = armv4_5_run_algorithm,
 101
 102         .add_breakpoint = arm7_9_add_breakpoint,
 103         .remove_breakpoint = arm7_9_remove_breakpoint,
 104         .add_watchpoint = arm7_9_add_watchpoint,
 105         .remove_watchpoint = arm7_9_remove_watchpoint,
 106
 107         .register_commands = arm926ejs_register_commands,
 108         .target_create = feroceon_target_create,
 109         .init_target = feroceon_init_target,
 110         .examine = feroceon_examine,
 111         .quit = feroceon_quit
 112 };
 113
 114
 115 int feroceon_dummy_clock_out(arm_jtag_t *jtag_info, uint32_t instr)
 116 {
 117         scan_field_t fields[3];
 118         uint8_t out_buf[4];
 119         uint8_t instr_buf[4];
 120         uint8_t sysspeed_buf = 0x0;
 121
 122         /* prepare buffer */
 123         buf_set_u32(out_buf, 0, 32, 0);
 124
 125         buf_set_u32(instr_buf, 0, 32, flip_u32(instr, 32));
 126
 127         jtag_set_end_state(TAP_DRPAUSE);
 128         arm_jtag_scann(jtag_info, 0x1);
 129
 130         arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL);
 131
 132         fields[0].tap = jtag_info->tap;
 133         fields[0].num_bits = 32;
 134         fields[0].out_value = out_buf;
 135
 136         fields[0].in_value = NULL;
 137
 138
 139
 140
 141
 142         fields[1].tap = jtag_info->tap;
 143         fields[1].num_bits = 3;
 144         fields[1].out_value = &sysspeed_buf;
 145
 146         fields[1].in_value = NULL;
 147
 148
 149
 150
 151
 152         fields[2].tap = jtag_info->tap;
 153         fields[2].num_bits = 32;
 154         fields[2].out_value = instr_buf;
 155
 156         fields[2].in_value = NULL;
 157
 158
 159
 160
 161
 162         jtag_add_dr_scan(3, fields, jtag_get_end_state());
 163
 164         /* no jtag_add_runtest(0, jtag_get_end_state()) here */
 165
 166         return ERROR_OK;
 167 }
 168
 169 void feroceon_change_to_arm(target_t *target, uint32_t *r0, uint32_t *pc)
 170 {
 171         armv4_5_common_t *armv4_5 = target->arch_info;
 172         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 173         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 174
 175         /*
 176          * save r0 before using it and put system in ARM state
 177          * to allow common handling of ARM and THUMB debugging
 178          */
 179
 180         feroceon_dummy_clock_out(jtag_info, ARMV4_5_T_NOP);
 181         feroceon_dummy_clock_out(jtag_info, ARMV4_5_T_NOP);
 182         feroceon_dummy_clock_out(jtag_info, ARMV4_5_T_NOP);
 183
 184         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), 0, NULL, 0);
 185         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 186         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 187         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, r0, 0);
 188         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 189         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 190
 191         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_MOV(0, 15), 0, NULL, 0);
 192         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), 0, NULL, 0);
 193         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 194         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 195         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, pc, 0);
 196         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 197         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 198
 199         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_BX(15), 0, NULL, 0);
 200         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 201         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 202         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 203         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 204
 205         jtag_execute_queue();
 206
 207         /*
 208          * fix program counter:
 209          * MOV R0, PC was the 7th instruction (+12)
 210          * reading PC in Thumb state gives address of instruction + 4
 211          */
 212         *pc -= (12 + 4);
 213 }
 214
 215 void feroceon_read_core_regs(target_t *target, uint32_t mask, uint32_t* core_regs[16])
 216 {
 217         int i;
 218         armv4_5_common_t *armv4_5 = target->arch_info;
 219         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 220         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 221
 222         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), 0, NULL, 0);
 223         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 224         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 225
 226         for (i = 0; i <= 15; i++)
 227                 if (mask & (1 << i))
 228                         arm9tdmi_clock_data_in(jtag_info, core_regs[i]);
 229
 230         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 231         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 232 }
 233
 234 void feroceon_read_core_regs_target_buffer(target_t *target, uint32_t mask, void* buffer, int size)
 235 {
 236         int i;
 237         armv4_5_common_t *armv4_5 = target->arch_info;
 238         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 239         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 240         int be = (target->endianness == TARGET_BIG_ENDIAN) ? 1 : 0;
 241         uint32_t *buf_u32 = buffer;
 242         uint16_t *buf_u16 = buffer;
 243         uint8_t *buf_u8 = buffer;
 244
 245         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), 0, NULL, 0);
 246         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 247         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 248
 249         for (i = 0; i <= 15; i++)
 250         {
 251                 if (mask & (1 << i)) {
 252                         switch (size)
 253                         {
 254                                 case 4:
 255                                         arm9tdmi_clock_data_in_endianness(jtag_info, buf_u32++, 4, be);
 256                                         break;
 257                                 case 2:
 258                                         arm9tdmi_clock_data_in_endianness(jtag_info, buf_u16++, 2, be);
 259                                         break;
 260                                 case 1:
 261                                         arm9tdmi_clock_data_in_endianness(jtag_info, buf_u8++, 1, be);
 262                                         break;
 263                         }
 264                 }
 265         }
 266
 267         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 268         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 269 }
 270
 271 void feroceon_read_xpsr(target_t *target, uint32_t *xpsr, int spsr)
 272 {
 273         armv4_5_common_t *armv4_5 = target->arch_info;
 274         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 275         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 276
 277         arm9tdmi_clock_out(jtag_info, ARMV4_5_MRS(0, spsr & 1), 0, NULL, 0);
 278         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 279         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 280         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 281         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 282         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 283         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 284
 285         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, 1, 0, 0), 0, NULL, 0);
 286         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 287         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 288         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, xpsr, 0);
 289
 290         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 291         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 292 }
 293
 294 void feroceon_write_xpsr(target_t *target, uint32_t xpsr, int spsr)
 295 {
 296         armv4_5_common_t *armv4_5 = target->arch_info;
 297         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 298         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 299
 300         LOG_DEBUG("xpsr: %8.8" PRIx32 ", spsr: %i", xpsr, spsr);
 301
 302         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr & 0xff, 0, 1, spsr), 0, NULL, 0);
 303         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 304         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 305         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 306         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 307         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 308         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 309
 310         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff00) >> 8, 0xc, 2, spsr), 0, NULL, 0);
 311         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 312         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 313         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 314         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 315         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 316         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 317
 318         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff0000) >> 16, 0x8, 4, spsr), 0, NULL, 0);
 319         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 320         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 321         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 322         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 323         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 324         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 325
 326         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff000000) >> 24, 0x4, 8, spsr), 0, NULL, 0);
 327         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 328         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 329         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 330         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 331         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 332         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 333 }
 334
 335 void feroceon_write_xpsr_im8(target_t *target, uint8_t xpsr_im, int rot, int spsr)
 336 {
 337         armv4_5_common_t *armv4_5 = target->arch_info;
 338         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 339         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 340
 341         LOG_DEBUG("xpsr_im: %2.2x, rot: %i, spsr: %i", xpsr_im, rot, spsr);
 342
 343         arm9tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr_im, rot, 1, spsr), 0, NULL, 0);
 344         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 345         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 346         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 347         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 348         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 349         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 350 }
 351
 352 void feroceon_write_core_regs(target_t *target, uint32_t mask, uint32_t core_regs[16])
 353 {
 354         int i;
 355         armv4_5_common_t *armv4_5 = target->arch_info;
 356         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 357         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 358
 359         arm9tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 0), 0, NULL, 0);
 360         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 361         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 362
 363         for (i = 0; i <= 15; i++)
 364                 if (mask & (1 << i))
 365                         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, core_regs[i], NULL, 0);
 366
 367         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 368         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 369         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 370 }
 371
 372 void feroceon_branch_resume(target_t *target)
 373 {
 374         armv4_5_common_t *armv4_5 = target->arch_info;
 375         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 376         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 377
 378         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 379         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 380         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 381         arm9tdmi_clock_out(jtag_info, ARMV4_5_B(0xfffff9, 0), 0, NULL, 0);
 382         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 383
 384         arm7_9->need_bypass_before_restart = 1;
 385 }
 386
 387 void feroceon_branch_resume_thumb(target_t *target)
 388 {
 389         LOG_DEBUG("-");
 390
 391         armv4_5_common_t *armv4_5 = target->arch_info;
 392         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 393         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 394         uint32_t r0 = buf_get_u32(armv4_5->core_cache->reg_list[0].value, 0, 32);
 395         uint32_t pc = buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32);
 396         (void)(r0); // use R0...
 397
 398         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 399         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 400         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 401         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 402
 403         arm9tdmi_clock_out(jtag_info, 0xE28F0001, 0, NULL, 0); // add r0,pc,#1
 404         arm9tdmi_clock_out(jtag_info, ARMV4_5_BX(0), 0, NULL, 0);
 405         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 406         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 407
 408         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_LDMIA(0, 0x1), 0, NULL, 0);
 409         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 410         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 411
 412         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, pc, NULL, 0);
 413         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 414         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 415
 416         pc = (pc & 2) >> 1;
 417         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_B(0x7e9 + pc), 0, NULL, 0);
 418         arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 1);
 419
 420         arm7_9->need_bypass_before_restart = 1;
 421 }
 422
 423 int feroceon_read_cp15(target_t *target, uint32_t op1, uint32_t op2, uint32_t CRn, uint32_t CRm, uint32_t *value)
 424 {
 425         armv4_5_common_t *armv4_5 = target->arch_info;
 426         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 427         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 428         int err;
 429
 430         arm9tdmi_clock_out(jtag_info, ARMV4_5_MRC(15, op1, 0, CRn, CRm, op2), 0, NULL, 0);
 431         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 432         err = arm7_9_execute_sys_speed(target);
 433         if (err != ERROR_OK)
 434                 return err;
 435
 436         arm9tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, 1, 0, 0), 0, NULL, 0);
 437         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 438         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 439         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, value, 0);
 440         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 441         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 442         return jtag_execute_queue();
 443 }
 444
 445 int feroceon_write_cp15(target_t *target, uint32_t op1, uint32_t op2, uint32_t CRn, uint32_t CRm, uint32_t value)
 446 {
 447         armv4_5_common_t *armv4_5 = target->arch_info;
 448         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 449         arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 450
 451         arm9tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 1, 0, 0), 0, NULL, 0);
 452         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 453         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 454         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, value, NULL, 0);
 455         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 456         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 457         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 458
 459         arm9tdmi_clock_out(jtag_info, ARMV4_5_MCR(15, op1, 0, CRn, CRm, op2), 0, NULL, 0);
 460         arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 1);
 461         return arm7_9_execute_sys_speed(target);
 462 }
 463
 464 void feroceon_set_dbgrq(target_t *target)
 465 {
 466         armv4_5_common_t *armv4_5 = target->arch_info;
 467         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 468         reg_t *dbg_ctrl = &arm7_9->eice_cache->reg_list[EICE_DBG_CTRL];
 469
 470         buf_set_u32(dbg_ctrl->value, 0, 8, 2);
 471         embeddedice_store_reg(dbg_ctrl);
 472 }
 473
 474 void feroceon_enable_single_step(target_t *target, uint32_t next_pc)
 475 {
 476         armv4_5_common_t *armv4_5 = target->arch_info;
 477         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 478
 479         /* set a breakpoint there */
 480         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_VALUE], next_pc);
 481         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK], 0);
 482         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK], 0xffffffff);
 483         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE], 0x100);
 484         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK], 0xf7);
 485 }
 486
 487 void feroceon_disable_single_step(target_t *target)
 488 {
 489         armv4_5_common_t *armv4_5 = target->arch_info;
 490         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 491
 492         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_VALUE]);
 493         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_ADDR_MASK]);
 494         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_DATA_MASK]);
 495         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_MASK]);
 496         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_W0_CONTROL_VALUE]);
 497 }
 498
 499 int feroceon_examine_debug_reason(target_t *target)
 500 {
 501         /* the MOE is not implemented */
 502         if (target->debug_reason != DBG_REASON_SINGLESTEP)
 503         {
 504                 target->debug_reason = DBG_REASON_DBGRQ;
 505         }
 506
 507         return ERROR_OK;
 508 }
 509
 510 int feroceon_bulk_write_memory(target_t *target, uint32_t address, uint32_t count, uint8_t *buffer)
 511 {
 512         int retval;
 513         armv4_5_common_t *armv4_5 = target->arch_info;
 514         arm7_9_common_t *arm7_9 = armv4_5->arch_info;
 515         enum armv4_5_state core_state = armv4_5->core_state;
 516         uint32_t x, flip, shift, save[7];
 517         uint32_t i;
 518
 519         /*
 520          * We can't use the dcc flow control bits, so let's transfer data
 521          * with 31 bits and flip the MSB each time a new data word is sent.
 522          */
 523         static uint32_t dcc_code[] =
 524         {
 525                 0xee115e10,     /* 3:   mrc     p14, 0, r5, c1, c0, 0   */
 526                 0xe3a0301e,     /* 1:   mov     r3, #30                 */
 527                 0xe3a04002,     /*      mov     r4, #2                  */
 528                 0xee111e10,     /* 2:   mrc     p14, 0, r1, c1, c0, 0   */
 529                 0xe1310005,     /*      teq     r1, r5                  */
 530                 0x0afffffc,     /*      beq     1b                      */
 531                 0xe1a05001,     /*      mov     r5, r1                  */
 532                 0xe1a01081,     /*      mov     r1, r1, lsl #1          */
 533                 0xee112e10,     /* 3:   mrc     p14, 0, r2, c1, c0, 0   */
 534                 0xe1320005,     /*      teq     r2, r5                  */
 535                 0x0afffffc,     /*      beq     3b                      */
 536                 0xe1a05002,     /*      mov     r5, r2                  */
 537                 0xe3c22102,     /*      bic     r2, r2, #0x80000000     */
 538                 0xe1811332,     /*      orr     r1, r1, r2, lsr r3      */
 539                 0xe2533001,     /*      subs    r3, r3, #1              */
 540                 0xe4801004,     /*      str     r1, [r0], #4            */
 541                 0xe1a01412,     /*      mov     r1, r2, lsl r4          */
 542                 0xe2844001,     /*      add     r4, r4, #1              */
 543                 0x4affffed,     /*      bmi     1b                      */
 544                 0xeafffff3,     /*      b       3b                      */
 545         };
 546
 547         uint32_t dcc_size = sizeof(dcc_code);
 548
 549         if (!arm7_9->dcc_downloads)
 550                 return target_write_memory(target, address, 4, count, buffer);
 551
 552         /* regrab previously allocated working_area, or allocate a new one */
 553         if (!arm7_9->dcc_working_area)
 554         {
 555                 uint8_t dcc_code_buf[dcc_size];
 556
 557                 /* make sure we have a working area */
 558                 if (target_alloc_working_area(target, dcc_size, &arm7_9->dcc_working_area) != ERROR_OK)
 559                 {
 560                         LOG_INFO("no working area available, falling back to memory writes");
 561                         return target_write_memory(target, address, 4, count, buffer);
 562                 }
 563
 564                 /* copy target instructions to target endianness */
 565                 for (i = 0; i < dcc_size/4; i++)
 566                         target_buffer_set_u32(target, dcc_code_buf + i*4, dcc_code[i]);
 567
 568                 /* write DCC code to working area */
 569                 if ((retval = target_write_memory(target, arm7_9->dcc_working_area->address, 4, dcc_size/4, dcc_code_buf)) != ERROR_OK)
 570                 {
 571                         return retval;
 572                 }
 573         }
 574
 575         /* backup clobbered processor state */
 576         for (i = 0; i <= 5; i++)
 577                 save[i] = buf_get_u32(armv4_5->core_cache->reg_list[i].value, 0, 32);
 578         save[i] = buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32);
 579
 580         /* set up target address in r0 */
 581         buf_set_u32(armv4_5->core_cache->reg_list[0].value, 0, 32, address);
 582         armv4_5->core_cache->reg_list[0].valid = 1;
 583         armv4_5->core_cache->reg_list[0].dirty = 1;
 584         armv4_5->core_state = ARMV4_5_STATE_ARM;
 585
 586         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_COMMS_DATA], 0);
 587         arm7_9_resume(target, 0, arm7_9->dcc_working_area->address, 1, 1);
 588
 589         /* send data over */
 590         x = 0;
 591         flip = 0;
 592         shift = 1;
 593         for (i = 0; i < count; i++)
 594         {
 595                 uint32_t y = target_buffer_get_u32(target, buffer);
 596                 uint32_t z = (x >> 1) | (y >> shift) | (flip ^= 0x80000000);
 597                 embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_COMMS_DATA], z);
 598                 x = y << (32 - shift);
 599                 if (++shift >= 32 || i + 1 >= count)
 600                 {
 601                         z = (x >> 1) | (flip ^= 0x80000000);
 602                         embeddedice_write_reg(&arm7_9->eice_cache->reg_list[EICE_COMMS_DATA], z);
 603                         x = 0;
 604                         shift = 1;
 605                 }
 606                 buffer += 4;
 607         }
 608
 609         target_halt(target);
 610         while (target->state != TARGET_HALTED)
 611                 target_poll(target);
 612
 613         /* restore target state */
 614         for (i = 0; i <= 5; i++)
 615         {
 616                 buf_set_u32(armv4_5->core_cache->reg_list[i].value, 0, 32, save[i]);
 617                 armv4_5->core_cache->reg_list[i].valid = 1;
 618                 armv4_5->core_cache->reg_list[i].dirty = 1;
 619         }
 620         buf_set_u32(armv4_5->core_cache->reg_list[15].value, 0, 32, save[i]);
 621         armv4_5->core_cache->reg_list[15].valid = 1;
 622         armv4_5->core_cache->reg_list[15].dirty = 1;
 623         armv4_5->core_state = core_state;
 624
 625         return ERROR_OK;
 626 }
 627
 628 int feroceon_init_target(struct command_context_s *cmd_ctx, struct target_s *target)
 629 {
 630         arm9tdmi_init_target(cmd_ctx, target);
 631         return ERROR_OK;
 632 }
 633
 634 int feroceon_quit(void)
 635 {
 636         return ERROR_OK;
 637 }
 638
 639 int feroceon_target_create(struct target_s *target, Jim_Interp *interp)
 640 {
 641         armv4_5_common_t *armv4_5;
 642         arm7_9_common_t *arm7_9;
 643         arm926ejs_common_t *arm926ejs = calloc(1,sizeof(arm926ejs_common_t));
 644
 645         arm926ejs_init_arch_info(target, arm926ejs, target->tap);
 646
 647         armv4_5 = target->arch_info;
 648         arm7_9 = armv4_5->arch_info;
 649
 650         /* override some insn sequence functions */
 651         arm7_9->change_to_arm = feroceon_change_to_arm;
 652         arm7_9->read_core_regs = feroceon_read_core_regs;
 653         arm7_9->read_core_regs_target_buffer = feroceon_read_core_regs_target_buffer;
 654         arm7_9->read_xpsr = feroceon_read_xpsr;
 655         arm7_9->write_xpsr = feroceon_write_xpsr;
 656         arm7_9->write_xpsr_im8 = feroceon_write_xpsr_im8;
 657         arm7_9->write_core_regs = feroceon_write_core_regs;
 658         arm7_9->branch_resume = feroceon_branch_resume;
 659         arm7_9->branch_resume_thumb = feroceon_branch_resume_thumb;
 660
 661         /* must be implemented with only one comparator */
 662         arm7_9->enable_single_step = feroceon_enable_single_step;
 663         arm7_9->disable_single_step = feroceon_disable_single_step;
 664
 665         /* MOE is not implemented */
 666         arm7_9->examine_debug_reason = feroceon_examine_debug_reason;
 667
 668         /* the standard ARM926 methods don't always work (don't ask...) */
 669         arm926ejs->read_cp15 = feroceon_read_cp15;
 670         arm926ejs->write_cp15 = feroceon_write_cp15;
 671
 672         /* Note: asserting DBGRQ might not win over the undef exception.
 673            If that happens then just use "arm7_9 dbgrq disable". */
 674         arm7_9->use_dbgrq = 1;
 675         arm7_9->set_special_dbgrq = feroceon_set_dbgrq;
 676
 677         /* only one working comparator */
 678         arm7_9->wp_available_max = 1;
 679         arm7_9->wp1_used_default = -1;
 680
 681         return ERROR_OK;
 682 }
 683
 684 int feroceon_examine(struct target_s *target)
 685 {
 686         armv4_5_common_t *armv4_5;
 687         arm7_9_common_t *arm7_9;
 688         int retval;
 689
 690         retval = arm9tdmi_examine(target);
 691         if (retval!=ERROR_OK)
 692                 return retval;
 693
 694         armv4_5 = target->arch_info;
 695         arm7_9 = armv4_5->arch_info;
 696
 697         /* the COMMS_CTRL bits are all contiguous */
 698         if (buf_get_u32(arm7_9->eice_cache->reg_list[EICE_COMMS_CTRL].value, 2, 4) != 6)
 699                 LOG_ERROR("unexpected Feroceon EICE version signature");
 700
 701         arm7_9->eice_cache->reg_list[EICE_DBG_CTRL].size = 6;
 702         arm7_9->eice_cache->reg_list[EICE_DBG_STAT].size = 5;
 703         arm7_9->has_monitor_mode = 1;
 704
 705         /* vector catch reg is not initialized on reset */
 706         embeddedice_set_reg(&arm7_9->eice_cache->reg_list[EICE_VEC_CATCH], 0);
 707
 708         /* clear monitor mode, enable comparators */
 709         embeddedice_read_reg(&arm7_9->eice_cache->reg_list[EICE_DBG_CTRL]);
 710         jtag_execute_queue();
 711         buf_set_u32(arm7_9->eice_cache->reg_list[EICE_DBG_CTRL].value, 4, 1, 0);
 712         buf_set_u32(arm7_9->eice_cache->reg_list[EICE_DBG_CTRL].value, 5, 1, 0);
 713         embeddedice_store_reg(&arm7_9->eice_cache->reg_list[EICE_DBG_CTRL]);
 714
 715         return ERROR_OK;
 716 }