src/jtag/drivers/ep93xx.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   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 #ifdef HAVE_CONFIG_H
  20 #include "config.h"
  21 #endif
  22
  23 #include <jtag/interface.h>
  24 #include "bitbang.h"
  25
  26 #define TDO_BIT         1
  27 #define TDI_BIT         2
  28 #define TCK_BIT         4
  29 #define TMS_BIT         8
  30 #define TRST_BIT        16
  31 #define SRST_BIT        32
  32 #define VCC_BIT         64
  33
  34 #include <sys/mman.h>
  35
  36 static uint8_t output_value;
  37 static int dev_mem_fd;
  38 static void *gpio_controller;
  39 static volatile uint8_t *gpio_data_register;
  40 static volatile uint8_t *gpio_data_direction_register;
  41
  42 /* low level command set
  43  */
  44 static int ep93xx_read(void);
  45 static void ep93xx_write(int tck, int tms, int tdi);
  46 static void ep93xx_reset(int trst, int srst);
  47
  48 static int ep93xx_init(void);
  49 static int ep93xx_quit(void);
  50
  51 struct timespec ep93xx_zzzz;
  52
  53 struct jtag_interface ep93xx_interface = {
  54         .name = "ep93xx",
  55
  56         .supported = DEBUG_CAP_TMS_SEQ,
  57         .execute_queue = bitbang_execute_queue,
  58
  59         .init = ep93xx_init,
  60         .quit = ep93xx_quit,
  61 };
  62
  63 static struct bitbang_interface ep93xx_bitbang = {
  64         .read = ep93xx_read,
  65         .write = ep93xx_write,
  66         .reset = ep93xx_reset,
  67         .blink = 0,
  68 };
  69
  70 static int ep93xx_read(void)
  71 {
  72         return !!(*gpio_data_register & TDO_BIT);
  73 }
  74
  75 static void ep93xx_write(int tck, int tms, int tdi)
  76 {
  77         if (tck)
  78                 output_value |= TCK_BIT;
  79         else
  80                 output_value &= ~TCK_BIT;
  81
  82         if (tms)
  83                 output_value |= TMS_BIT;
  84         else
  85                 output_value &= ~TMS_BIT;
  86
  87         if (tdi)
  88                 output_value |= TDI_BIT;
  89         else
  90                 output_value &= ~TDI_BIT;
  91
  92         *gpio_data_register = output_value;
  93         nanosleep(&ep93xx_zzzz, NULL);
  94 }
  95
  96 /* (1) assert or (0) deassert reset lines */
  97 static void ep93xx_reset(int trst, int srst)
  98 {
  99         if (trst == 0)
 100                 output_value |= TRST_BIT;
 101         else if (trst == 1)
 102                 output_value &= ~TRST_BIT;
 103
 104         if (srst == 0)
 105                 output_value |= SRST_BIT;
 106         else if (srst == 1)
 107                 output_value &= ~SRST_BIT;
 108
 109         *gpio_data_register = output_value;
 110         nanosleep(&ep93xx_zzzz, NULL);
 111 }
 112
 113 static int set_gonk_mode(void)
 114 {
 115         void *syscon;
 116         uint32_t devicecfg;
 117
 118         syscon = mmap(NULL, 4096, PROT_READ | PROT_WRITE,
 119                         MAP_SHARED, dev_mem_fd, 0x80930000);
 120         if (syscon == MAP_FAILED) {
 121                 perror("mmap");
 122                 return ERROR_JTAG_INIT_FAILED;
 123         }
 124
 125         devicecfg = *((volatile int *)(syscon + 0x80));
 126         *((volatile int *)(syscon + 0xc0)) = 0xaa;
 127         *((volatile int *)(syscon + 0x80)) = devicecfg | 0x08000000;
 128
 129         munmap(syscon, 4096);
 130
 131         return ERROR_OK;
 132 }
 133
 134 static int ep93xx_init(void)
 135 {
 136         int ret;
 137
 138         bitbang_interface = &ep93xx_bitbang;
 139
 140         ep93xx_zzzz.tv_sec = 0;
 141         ep93xx_zzzz.tv_nsec = 10000000;
 142
 143         dev_mem_fd = open("/dev/mem", O_RDWR | O_SYNC);
 144         if (dev_mem_fd < 0) {
 145                 perror("open");
 146                 return ERROR_JTAG_INIT_FAILED;
 147         }
 148
 149         gpio_controller = mmap(NULL, 4096, PROT_READ | PROT_WRITE,
 150                                 MAP_SHARED, dev_mem_fd, 0x80840000);
 151         if (gpio_controller == MAP_FAILED) {
 152                 perror("mmap");
 153                 close(dev_mem_fd);
 154                 return ERROR_JTAG_INIT_FAILED;
 155         }
 156
 157         ret = set_gonk_mode();
 158         if (ret != ERROR_OK) {
 159                 munmap(gpio_controller, 4096);
 160                 close(dev_mem_fd);
 161                 return ret;
 162         }
 163
 164 #if 0
 165         /* Use GPIO port A.  */
 166         gpio_data_register = gpio_controller + 0x00;
 167         gpio_data_direction_register = gpio_controller + 0x10;
 168
 169
 170         /* Use GPIO port B.  */
 171         gpio_data_register = gpio_controller + 0x04;
 172         gpio_data_direction_register = gpio_controller + 0x14;
 173
 174         /* Use GPIO port C.  */
 175         gpio_data_register = gpio_controller + 0x08;
 176         gpio_data_direction_register = gpio_controller + 0x18;
 177
 178         /* Use GPIO port D.  */
 179         gpio_data_register = gpio_controller + 0x0c;
 180         gpio_data_direction_register = gpio_controller + 0x1c;
 181 #endif
 182
 183         /* Use GPIO port C.  */
 184         gpio_data_register = gpio_controller + 0x08;
 185         gpio_data_direction_register = gpio_controller + 0x18;
 186
 187         LOG_INFO("gpio_data_register      = %p", gpio_data_register);
 188         LOG_INFO("gpio_data_direction_reg = %p", gpio_data_direction_register);
 189         /*
 190          * Configure bit 0 (TDO) as an input, and bits 1-5 (TDI, TCK
 191          * TMS, TRST, SRST) as outputs.  Drive TDI and TCK low, and
 192          * TMS/TRST/SRST high.
 193          */
 194         output_value = TMS_BIT | TRST_BIT | SRST_BIT | VCC_BIT;
 195         *gpio_data_register = output_value;
 196         nanosleep(&ep93xx_zzzz, NULL);
 197
 198         /*
 199          * Configure the direction register.  1 = output, 0 = input.
 200          */
 201         *gpio_data_direction_register =
 202                 TDI_BIT | TCK_BIT | TMS_BIT | TRST_BIT | SRST_BIT | VCC_BIT;
 203
 204         nanosleep(&ep93xx_zzzz, NULL);
 205         return ERROR_OK;
 206 }
 207
 208 static int ep93xx_quit(void)
 209 {
 210
 211         return ERROR_OK;
 212 }