1 /***************************************************************************
2 * Copyright (C) 2006 by Anders Larsen *
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. *
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. *
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 ***************************************************************************/
23 #include <jtag/interface.h>
29 #define AT91C_BASE_SYS (0xfffff000)
37 #define PIO_PER (0) /* PIO enable */
38 #define PIO_OER (4) /* output enable */
39 #define PIO_ODR (5) /* output disable */
40 #define PIO_SODR (12) /* set output data */
41 #define PIO_CODR (13) /* clear output data */
42 #define PIO_PDSR (15) /* pin data status */
43 #define PIO_PPUER (25) /* pull-up enable */
45 #define NC (0) /* not connected */
81 int TDO_PIO; /* PIO holding TDO */
82 uint32_t TDO_MASK; /* TDO bitmask */
83 int TRST_PIO; /* PIO holding TRST */
84 uint32_t TRST_MASK; /* TRST bitmask */
85 int TMS_PIO; /* PIO holding TMS */
86 uint32_t TMS_MASK; /* TMS bitmask */
87 int TCK_PIO; /* PIO holding TCK */
88 uint32_t TCK_MASK; /* TCK bitmask */
89 int TDI_PIO; /* PIO holding TDI */
90 uint32_t TDI_MASK; /* TDI bitmask */
91 int SRST_PIO; /* PIO holding SRST */
92 uint32_t SRST_MASK; /* SRST bitmask */
95 static const struct device_t devices[] = {
96 { "rea_ecr", PIOD, P27, PIOA, NC, PIOD, P23, PIOD, P24, PIOD, P26, PIOC, P5 },
101 static char *at91rm9200_device;
103 /* interface variables
105 static const struct device_t *device;
106 static int dev_mem_fd;
107 static void *sys_controller;
108 static uint32_t *pio_base;
110 /* low level command set
112 static bb_value_t at91rm9200_read(void);
113 static int at91rm9200_write(int tck, int tms, int tdi);
114 static int at91rm9200_reset(int trst, int srst);
116 static int at91rm9200_init(void);
117 static int at91rm9200_quit(void);
119 static struct bitbang_interface at91rm9200_bitbang = {
120 .read = at91rm9200_read,
121 .write = at91rm9200_write,
122 .reset = at91rm9200_reset,
126 static bb_value_t at91rm9200_read(void)
128 return (pio_base[device->TDO_PIO + PIO_PDSR] & device->TDO_MASK) ? BB_HIGH : BB_LOW;
131 static int at91rm9200_write(int tck, int tms, int tdi)
134 pio_base[device->TCK_PIO + PIO_SODR] = device->TCK_MASK;
136 pio_base[device->TCK_PIO + PIO_CODR] = device->TCK_MASK;
139 pio_base[device->TMS_PIO + PIO_SODR] = device->TMS_MASK;
141 pio_base[device->TMS_PIO + PIO_CODR] = device->TMS_MASK;
144 pio_base[device->TDI_PIO + PIO_SODR] = device->TDI_MASK;
146 pio_base[device->TDI_PIO + PIO_CODR] = device->TDI_MASK;
151 /* (1) assert or (0) deassert reset lines */
152 static int at91rm9200_reset(int trst, int srst)
155 pio_base[device->TRST_PIO + PIO_SODR] = device->TRST_MASK;
157 pio_base[device->TRST_PIO + PIO_CODR] = device->TRST_MASK;
160 pio_base[device->SRST_PIO + PIO_SODR] = device->SRST_MASK;
162 pio_base[device->SRST_PIO + PIO_CODR] = device->SRST_MASK;
167 COMMAND_HANDLER(at91rm9200_handle_device_command)
170 return ERROR_COMMAND_SYNTAX_ERROR;
172 /* only if the device name wasn't overwritten by cmdline */
173 if (at91rm9200_device == 0) {
174 at91rm9200_device = malloc(strlen(CMD_ARGV[0]) + sizeof(char));
175 strcpy(at91rm9200_device, CMD_ARGV[0]);
181 static const struct command_registration at91rm9200_command_handlers[] = {
183 .name = "at91rm9200_device",
184 .handler = &at91rm9200_handle_device_command,
185 .mode = COMMAND_CONFIG,
186 .help = "query armjtagew info",
188 COMMAND_REGISTRATION_DONE
191 struct jtag_interface at91rm9200_interface = {
192 .name = "at91rm9200",
193 .execute_queue = bitbang_execute_queue,
194 .commands = at91rm9200_command_handlers,
195 .init = at91rm9200_init,
196 .quit = at91rm9200_quit,
199 static int at91rm9200_init(void)
201 const struct device_t *cur_device;
203 cur_device = devices;
205 if (at91rm9200_device == NULL || at91rm9200_device[0] == 0) {
206 at91rm9200_device = "rea_ecr";
207 LOG_WARNING("No at91rm9200 device specified, using default 'rea_ecr'");
210 while (cur_device->name) {
211 if (strcmp(cur_device->name, at91rm9200_device) == 0) {
219 LOG_ERROR("No matching device found for %s", at91rm9200_device);
220 return ERROR_JTAG_INIT_FAILED;
223 bitbang_interface = &at91rm9200_bitbang;
225 dev_mem_fd = open("/dev/mem", O_RDWR | O_SYNC);
226 if (dev_mem_fd < 0) {
228 return ERROR_JTAG_INIT_FAILED;
231 sys_controller = mmap(NULL, 4096, PROT_READ | PROT_WRITE,
232 MAP_SHARED, dev_mem_fd, AT91C_BASE_SYS);
233 if (sys_controller == MAP_FAILED) {
236 return ERROR_JTAG_INIT_FAILED;
238 pio_base = (uint32_t *)sys_controller + 0x100;
241 * Configure TDO as an input, and TDI, TCK, TMS, TRST, SRST
242 * as outputs. Drive TDI and TCK low, and TMS/TRST/SRST high.
244 pio_base[device->TDI_PIO + PIO_CODR] = device->TDI_MASK;
245 pio_base[device->TDI_PIO + PIO_OER] = device->TDI_MASK;
246 pio_base[device->TDI_PIO + PIO_PER] = device->TDI_MASK;
247 pio_base[device->TCK_PIO + PIO_CODR] = device->TCK_MASK;
248 pio_base[device->TCK_PIO + PIO_OER] = device->TCK_MASK;
249 pio_base[device->TCK_PIO + PIO_PER] = device->TCK_MASK;
250 pio_base[device->TMS_PIO + PIO_SODR] = device->TMS_MASK;
251 pio_base[device->TMS_PIO + PIO_OER] = device->TMS_MASK;
252 pio_base[device->TMS_PIO + PIO_PER] = device->TMS_MASK;
253 pio_base[device->TRST_PIO + PIO_SODR] = device->TRST_MASK;
254 pio_base[device->TRST_PIO + PIO_OER] = device->TRST_MASK;
255 pio_base[device->TRST_PIO + PIO_PER] = device->TRST_MASK;
256 pio_base[device->SRST_PIO + PIO_SODR] = device->SRST_MASK;
257 pio_base[device->SRST_PIO + PIO_OER] = device->SRST_MASK;
258 pio_base[device->SRST_PIO + PIO_PER] = device->SRST_MASK;
259 pio_base[device->TDO_PIO + PIO_ODR] = device->TDO_MASK;
260 pio_base[device->TDO_PIO + PIO_PPUER] = device->TDO_MASK;
261 pio_base[device->TDO_PIO + PIO_PER] = device->TDO_MASK;
266 static int at91rm9200_quit(void)