src/jtag/commands.c

   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 SoftPLC Corporation                                *
   9  *       http://softplc.com                                                *
  10  *   dick@softplc.com                                                      *
  11  *                                                                         *
  12  *   Copyright (C) 2009 Zachary T Welch                                    *
  13  *   zw@superlucidity.net                                                  *
  14  *                                                                         *
  15  *   This program is free software; you can redistribute it and/or modify  *
  16  *   it under the terms of the GNU General Public License as published by  *
  17  *   the Free Software Foundation; either version 2 of the License, or     *
  18  *   (at your option) any later version.                                   *
  19  *                                                                         *
  20  *   This program is distributed in the hope that it will be useful,       *
  21  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  22  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  23  *   GNU General Public License for more details.                          *
  24  *                                                                         *
  25  *   You should have received a copy of the GNU General Public License     *
  26  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  27  ***************************************************************************/
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include "config.h"
  31 #endif
  32
  33 #include <jtag/jtag.h>
  34 #include "commands.h"
  35
  36 struct cmd_queue_page {
  37         struct cmd_queue_page *next;
  38         void *address;
  39         size_t used;
  40 };
  41
  42 #define CMD_QUEUE_PAGE_SIZE (1024 * 1024)
  43 static struct cmd_queue_page *cmd_queue_pages;
  44 static struct cmd_queue_page *cmd_queue_pages_tail;
  45
  46 struct jtag_command *jtag_command_queue;
  47 static struct jtag_command **next_command_pointer = &jtag_command_queue;
  48
  49 void jtag_queue_command(struct jtag_command *cmd)
  50 {
  51         /* this command goes on the end, so ensure the queue terminates */
  52         cmd->next = NULL;
  53
  54         struct jtag_command **last_cmd = next_command_pointer;
  55         assert(NULL != last_cmd);
  56         assert(NULL == *last_cmd);
  57         *last_cmd = cmd;
  58
  59         /* store location where the next command pointer will be stored */
  60         next_command_pointer = &cmd->next;
  61 }
  62
  63 void *cmd_queue_alloc(size_t size)
  64 {
  65         struct cmd_queue_page **p_page = &cmd_queue_pages;
  66         int offset;
  67         uint8_t *t;
  68
  69         /*
  70          * WARNING:
  71          *    We align/round the *SIZE* per below
  72          *    so that all pointers returned by
  73          *    this function are reasonably well
  74          *    aligned.
  75          *
  76          * If we did not, then an "odd-length" request would cause the
  77          * *next* allocation to be at an *odd* address, and because
  78          * this function has the same type of api as malloc() - we
  79          * must also return pointers that have the same type of
  80          * alignment.
  81          *
  82          * What I do not/have is a reasonable portable means
  83          * to align by...
  84          *
  85          * The solution here, is based on these suggestions.
  86          * http://gcc.gnu.org/ml/gcc-help/2008-12/msg00041.html
  87          *
  88          */
  89         union worse_case_align {
  90                 int i;
  91                 long l;
  92                 float f;
  93                 void *v;
  94         };
  95 #define ALIGN_SIZE  (sizeof(union worse_case_align))
  96
  97         /* The alignment process. */
  98         size = (size + ALIGN_SIZE - 1) & (~(ALIGN_SIZE - 1));
  99         /* Done... */
 100
 101         if (*p_page) {
 102                 p_page = &cmd_queue_pages_tail;
 103                 if (CMD_QUEUE_PAGE_SIZE - (*p_page)->used < size)
 104                         p_page = &((*p_page)->next);
 105         }
 106
 107         if (!*p_page) {
 108                 *p_page = malloc(sizeof(struct cmd_queue_page));
 109                 (*p_page)->used = 0;
 110                 size_t alloc_size = (size < CMD_QUEUE_PAGE_SIZE) ?
 111                                         CMD_QUEUE_PAGE_SIZE : size;
 112                 (*p_page)->address = malloc(alloc_size);
 113                 (*p_page)->next = NULL;
 114                 cmd_queue_pages_tail = *p_page;
 115         }
 116
 117         offset = (*p_page)->used;
 118         (*p_page)->used += size;
 119
 120         t = (*p_page)->address;
 121         return t + offset;
 122 }
 123
 124 static void cmd_queue_free(void)
 125 {
 126         struct cmd_queue_page *page = cmd_queue_pages;
 127
 128         while (page) {
 129                 struct cmd_queue_page *last = page;
 130                 free(page->address);
 131                 page = page->next;
 132                 free(last);
 133         }
 134
 135         cmd_queue_pages = NULL;
 136         cmd_queue_pages_tail = NULL;
 137 }
 138
 139 void jtag_command_queue_reset(void)
 140 {
 141         cmd_queue_free();
 142
 143         jtag_command_queue = NULL;
 144         next_command_pointer = &jtag_command_queue;
 145 }
 146
 147 enum scan_type jtag_scan_type(const struct scan_command *cmd)
 148 {
 149         int i;
 150         int type = 0;
 151
 152         for (i = 0; i < cmd->num_fields; i++) {
 153                 if (cmd->fields[i].in_value)
 154                         type |= SCAN_IN;
 155                 if (cmd->fields[i].out_value)
 156                         type |= SCAN_OUT;
 157         }
 158
 159         return type;
 160 }
 161
 162 int jtag_scan_size(const struct scan_command *cmd)
 163 {
 164         int bit_count = 0;
 165         int i;
 166
 167         /* count bits in scan command */
 168         for (i = 0; i < cmd->num_fields; i++)
 169                 bit_count += cmd->fields[i].num_bits;
 170
 171         return bit_count;
 172 }
 173
 174 int jtag_build_buffer(const struct scan_command *cmd, uint8_t **buffer)
 175 {
 176         int bit_count = 0;
 177         int i;
 178
 179         bit_count = jtag_scan_size(cmd);
 180         *buffer = calloc(1, DIV_ROUND_UP(bit_count, 8));
 181
 182         bit_count = 0;
 183
 184         DEBUG_JTAG_IO("%s num_fields: %i",
 185                         cmd->ir_scan ? "IRSCAN" : "DRSCAN",
 186                         cmd->num_fields);
 187
 188         for (i = 0; i < cmd->num_fields; i++) {
 189                 if (cmd->fields[i].out_value) {
 190 #ifdef _DEBUG_JTAG_IO_
 191                         char *char_buf = buf_to_str(cmd->fields[i].out_value,
 192                                 (cmd->fields[i].num_bits > DEBUG_JTAG_IOZ)
 193                                         ? DEBUG_JTAG_IOZ
 194                                         : cmd->fields[i].num_bits, 16);
 195
 196                         LOG_DEBUG("fields[%i].out_value[%i]: 0x%s", i,
 197                                         cmd->fields[i].num_bits, char_buf);
 198                         free(char_buf);
 199 #endif
 200                         buf_set_buf(cmd->fields[i].out_value, 0, *buffer,
 201                                         bit_count, cmd->fields[i].num_bits);
 202                 } else {
 203                         DEBUG_JTAG_IO("fields[%i].out_value[%i]: NULL",
 204                                         i, cmd->fields[i].num_bits);
 205                 }
 206
 207                 bit_count += cmd->fields[i].num_bits;
 208         }
 209
 210         /*DEBUG_JTAG_IO("bit_count totalling: %i",  bit_count); */
 211
 212         return bit_count;
 213 }
 214
 215 int jtag_read_buffer(uint8_t *buffer, const struct scan_command *cmd)
 216 {
 217         int i;
 218         int bit_count = 0;
 219         int retval;
 220
 221         /* we return ERROR_OK, unless a check fails, or a handler reports a problem */
 222         retval = ERROR_OK;
 223
 224         for (i = 0; i < cmd->num_fields; i++) {
 225                 /* if neither in_value nor in_handler
 226                  * are specified we don't have to examine this field
 227                  */
 228                 if (cmd->fields[i].in_value) {
 229                         int num_bits = cmd->fields[i].num_bits;
 230                         uint8_t *captured = buf_set_buf(buffer, bit_count,
 231                                         malloc(DIV_ROUND_UP(num_bits, 8)), 0, num_bits);
 232
 233 #ifdef _DEBUG_JTAG_IO_
 234                         char *char_buf = buf_to_str(captured,
 235                                         (num_bits > DEBUG_JTAG_IOZ)
 236                                                 ? DEBUG_JTAG_IOZ
 237                                                 : num_bits, 16);
 238
 239                         LOG_DEBUG("fields[%i].in_value[%i]: 0x%s",
 240                                         i, num_bits, char_buf);
 241                         free(char_buf);
 242 #endif
 243
 244                         if (cmd->fields[i].in_value)
 245                                 buf_cpy(captured, cmd->fields[i].in_value, num_bits);
 246
 247                         free(captured);
 248                 }
 249                 bit_count += cmd->fields[i].num_bits;
 250         }
 251
 252         return retval;
 253 }