--- /dev/null
+/***************************************************************************
+ * Copyright (C) 2013 by Paul Fertser, fercerpav@gmail.com *
+ * *
+ * Copyright (C) 2012 by Creative Product Design, marc @ cpdesign.com.au *
+ * Based on at91rm9200.c (c) Anders Larsen *
+ * and RPi GPIO examples by Gert van Loo & Dom *
+ * *
+ * This program is free software; you can redistribute it and/or modify *
+ * it under the terms of the GNU General Public License as published by *
+ * the Free Software Foundation; either version 2 of the License, or *
+ * (at your option) any later version. *
+ * *
+ * This program is distributed in the hope that it will be useful, *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
+ * GNU General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU General Public License *
+ * along with this program; if not, write to the *
+ * Free Software Foundation, Inc., *
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
+ ***************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <jtag/interface.h>
+#include "bitbang.h"
+
+#include <sys/mman.h>
+
+#define BCM2835_PERI_BASE 0x20000000
+#define BCM2835_GPIO_BASE (BCM2835_PERI_BASE + 0x200000) /* GPIO controller */
+
+/* GPIO setup macros */
+#define MODE_GPIO(g) (*(pio_base+((g)/10))>>(((g)%10)*3) & 7)
+#define INP_GPIO(g) do { *(pio_base+((g)/10)) &= ~(7<<(((g)%10)*3)); } while (0)
+#define SET_MODE_GPIO(g, m) do { /* clear the mode bits first, then set as necessary */ \
+ INP_GPIO(g); \
+ *(pio_base+((g)/10)) |= ((m)<<(((g)%10)*3)); } while (0)
+#define OUT_GPIO(g) SET_MODE_GPIO(g, 1)
+
+#define GPIO_SET (*(pio_base+7)) /* sets bits which are 1, ignores bits which are 0 */
+#define GPIO_CLR (*(pio_base+10)) /* clears bits which are 1, ignores bits which are 0 */
+#define GPIO_LEV (*(pio_base+13)) /* current level of the pin */
+
+static int dev_mem_fd;
+static volatile uint32_t *pio_base;
+
+static int bcm2835gpio_read(void);
+static void bcm2835gpio_write(int tck, int tms, int tdi);
+static void bcm2835gpio_reset(int trst, int srst);
+
+static int bcm2835gpio_init(void);
+static int bcm2835gpio_quit(void);
+
+static struct bitbang_interface bcm2835gpio_bitbang = {
+ .read = bcm2835gpio_read,
+ .write = bcm2835gpio_write,
+ .reset = bcm2835gpio_reset,
+ .blink = NULL
+};
+
+/* GPIO numbers for each signal. Negative values are invalid */
+static int tck_gpio = -1;
+static int tck_gpio_mode;
+static int tms_gpio = -1;
+static int tms_gpio_mode;
+static int tdi_gpio = -1;
+static int tdi_gpio_mode;
+static int tdo_gpio = -1;
+static int tdo_gpio_mode;
+static int trst_gpio = -1;
+static int trst_gpio_mode;
+static int srst_gpio = -1;
+static int srst_gpio_mode;
+
+/* Transition delay coefficients */
+static int speed_coeff = 113714;
+static int speed_offset = 28;
+static unsigned int jtag_delay;
+
+static int bcm2835gpio_read(void)
+{
+ return !!(GPIO_LEV & 1<<tdo_gpio);
+}
+
+static void bcm2835gpio_write(int tck, int tms, int tdi)
+{
+ uint32_t set = tck<<tck_gpio | tms<<tms_gpio | tdi<<tdi_gpio;
+ uint32_t clear = !tck<<tck_gpio | !tms<<tms_gpio | !tdi<<tdi_gpio;
+
+ GPIO_SET = set;
+ GPIO_CLR = clear;
+
+ for (unsigned int i = 0; i < jtag_delay; i++)
+ asm volatile ("");
+}
+
+/* (1) assert or (0) deassert reset lines */
+static void bcm2835gpio_reset(int trst, int srst)
+{
+ uint32_t set = 0;
+ uint32_t clear = 0;
+
+ if (trst_gpio > 0) {
+ set |= !trst<<trst_gpio;
+ clear |= trst<<trst_gpio;
+ }
+
+ if (srst_gpio > 0) {
+ set |= !srst<<srst_gpio;
+ clear |= srst<<srst_gpio;
+ }
+
+ GPIO_SET = set;
+ GPIO_CLR = clear;
+}
+
+static int bcm2835gpio_khz(int khz, int *jtag_speed)
+{
+ if (!khz) {
+ LOG_DEBUG("RCLK not supported");
+ return ERROR_FAIL;
+ }
+ *jtag_speed = speed_coeff/khz - speed_offset;
+ if (*jtag_speed < 0)
+ *jtag_speed = 0;
+ return ERROR_OK;
+}
+
+static int bcm2835gpio_speed_div(int speed, int *khz)
+{
+ *khz = speed_coeff/(speed + speed_offset);
+ return ERROR_OK;
+}
+
+static int bcm2835gpio_speed(int speed)
+{
+ jtag_delay = speed;
+ return ERROR_OK;
+}
+
+static int is_gpio_valid(int gpio)
+{
+ return gpio >= 0 && gpio <= 53;
+}
+
+COMMAND_HANDLER(bcm2835gpio_handle_jtag_gpionums)
+{
+ if (CMD_ARGC == 4) {
+ COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], tck_gpio);
+ COMMAND_PARSE_NUMBER(int, CMD_ARGV[1], tms_gpio);
+ COMMAND_PARSE_NUMBER(int, CMD_ARGV[2], tdi_gpio);
+ COMMAND_PARSE_NUMBER(int, CMD_ARGV[3], tdo_gpio);
+ } else if (CMD_ARGC != 0) {
+ return ERROR_COMMAND_SYNTAX_ERROR;
+ }
+
+ command_print(CMD_CTX,
+ "BCM2835 GPIO config: tck = %d, tms = %d, tdi = %d, tdi = %d",
+ tck_gpio, tms_gpio, tdi_gpio, tdo_gpio);
+
+ return ERROR_OK;
+}
+
+COMMAND_HANDLER(bcm2835gpio_handle_jtag_gpionum_tck)
+{
+ if (CMD_ARGC == 1)
+ COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], tck_gpio);
+
+ command_print(CMD_CTX, "BCM2835 GPIO config: tck = %d", tck_gpio);
+ return ERROR_OK;
+}
+
+COMMAND_HANDLER(bcm2835gpio_handle_jtag_gpionum_tms)
+{
+ if (CMD_ARGC == 1)
+ COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], tms_gpio);
+
+ command_print(CMD_CTX, "BCM2835 GPIO config: tms = %d", tms_gpio);
+ return ERROR_OK;
+}
+
+COMMAND_HANDLER(bcm2835gpio_handle_jtag_gpionum_tdo)
+{
+ if (CMD_ARGC == 1)
+ COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], tdo_gpio);
+
+ command_print(CMD_CTX, "BCM2835 GPIO config: tdo = %d", tdo_gpio);
+ return ERROR_OK;
+}
+
+COMMAND_HANDLER(bcm2835gpio_handle_jtag_gpionum_tdi)
+{
+ if (CMD_ARGC == 1)
+ COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], tdi_gpio);
+
+ command_print(CMD_CTX, "BCM2835 GPIO config: tdi = %d", tdi_gpio);
+ return ERROR_OK;
+}
+
+COMMAND_HANDLER(bcm2835gpio_handle_jtag_gpionum_srst)
+{
+ if (CMD_ARGC == 1)
+ COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], srst_gpio);
+
+ command_print(CMD_CTX, "BCM2835 GPIO config: srst = %d", srst_gpio);
+ return ERROR_OK;
+}
+
+COMMAND_HANDLER(bcm2835gpio_handle_jtag_gpionum_trst)
+{
+ if (CMD_ARGC == 1)
+ COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], trst_gpio);
+
+ command_print(CMD_CTX, "BCM2835 GPIO config: trst = %d", trst_gpio);
+ return ERROR_OK;
+}
+
+COMMAND_HANDLER(bcm2835gpio_handle_speed_coeffs)
+{
+ if (CMD_ARGC == 2) {
+ COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], speed_coeff);
+ COMMAND_PARSE_NUMBER(int, CMD_ARGV[1], speed_offset);
+ }
+ return ERROR_OK;
+}
+
+static const struct command_registration bcm2835gpio_command_handlers[] = {
+ {
+ .name = "bcm2835gpio_jtag_nums",
+ .handler = &bcm2835gpio_handle_jtag_gpionums,
+ .mode = COMMAND_CONFIG,
+ .help = "gpio numbers for tck, tms, tdi, tdo. (in that order)",
+ .usage = "(tck tms tdi tdo)* ",
+ },
+ {
+ .name = "bcm2835gpio_tck_num",
+ .handler = &bcm2835gpio_handle_jtag_gpionum_tck,
+ .mode = COMMAND_CONFIG,
+ .help = "gpio number for tck.",
+ },
+ {
+ .name = "bcm2835gpio_tms_num",
+ .handler = &bcm2835gpio_handle_jtag_gpionum_tms,
+ .mode = COMMAND_CONFIG,
+ .help = "gpio number for tms.",
+ },
+ {
+ .name = "bcm2835gpio_tdo_num",
+ .handler = &bcm2835gpio_handle_jtag_gpionum_tdo,
+ .mode = COMMAND_CONFIG,
+ .help = "gpio number for tdo.",
+ },
+ {
+ .name = "bcm2835gpio_tdi_num",
+ .handler = &bcm2835gpio_handle_jtag_gpionum_tdi,
+ .mode = COMMAND_CONFIG,
+ .help = "gpio number for tdi.",
+ },
+ {
+ .name = "bcm2835gpio_srst_num",
+ .handler = &bcm2835gpio_handle_jtag_gpionum_srst,
+ .mode = COMMAND_CONFIG,
+ .help = "gpio number for srst.",
+ },
+ {
+ .name = "bcm2835gpio_trst_num",
+ .handler = &bcm2835gpio_handle_jtag_gpionum_trst,
+ .mode = COMMAND_CONFIG,
+ .help = "gpio number for trst.",
+ },
+ {
+ .name = "bcm2835gpio_speed_coeffs",
+ .handler = &bcm2835gpio_handle_speed_coeffs,
+ .mode = COMMAND_CONFIG,
+ .help = "SPEED_COEFF and SPEED_OFFSET for delay calculations.",
+ },
+ COMMAND_REGISTRATION_DONE
+};
+
+struct jtag_interface bcm2835gpio_interface = {
+ .name = "bcm2835gpio",
+ .supported = DEBUG_CAP_TMS_SEQ,
+ .execute_queue = bitbang_execute_queue,
+ .transports = jtag_only,
+ .speed = bcm2835gpio_speed,
+ .khz = bcm2835gpio_khz,
+ .speed_div = bcm2835gpio_speed_div,
+ .commands = bcm2835gpio_command_handlers,
+ .init = bcm2835gpio_init,
+ .quit = bcm2835gpio_quit,
+};
+
+static int bcm2835gpio_init(void)
+{
+ bitbang_interface = &bcm2835gpio_bitbang;
+
+ if (!is_gpio_valid(tdo_gpio) || !is_gpio_valid(tdi_gpio) ||
+ !is_gpio_valid(tck_gpio) || !is_gpio_valid(tms_gpio) ||
+ (trst_gpio != -1 && !is_gpio_valid(trst_gpio)) ||
+ (srst_gpio != -1 && !is_gpio_valid(srst_gpio)))
+ return ERROR_JTAG_INIT_FAILED;
+
+ dev_mem_fd = open("/dev/mem", O_RDWR | O_SYNC);
+ if (dev_mem_fd < 0) {
+ perror("open");
+ return ERROR_JTAG_INIT_FAILED;
+ }
+
+ pio_base = mmap(NULL, sysconf(_SC_PAGE_SIZE), PROT_READ | PROT_WRITE,
+ MAP_SHARED, dev_mem_fd, BCM2835_GPIO_BASE);
+
+ if (pio_base == MAP_FAILED) {
+ perror("mmap");
+ close(dev_mem_fd);
+ return ERROR_JTAG_INIT_FAILED;
+ }
+
+ tdo_gpio_mode = MODE_GPIO(tdo_gpio);
+ tdi_gpio_mode = MODE_GPIO(tdi_gpio);
+ tck_gpio_mode = MODE_GPIO(tck_gpio);
+ tms_gpio_mode = MODE_GPIO(tms_gpio);
+ /*
+ * Configure TDO as an input, and TDI, TCK, TMS, TRST, SRST
+ * as outputs. Drive TDI and TCK low, and TMS/TRST/SRST high.
+ */
+ INP_GPIO(tdo_gpio);
+
+ GPIO_CLR = 1<<tdi_gpio | 1<<tck_gpio;
+ GPIO_SET = 1<<tms_gpio;
+
+ OUT_GPIO(tdi_gpio);
+ OUT_GPIO(tck_gpio);
+ OUT_GPIO(tms_gpio);
+ if (trst_gpio != -1) {
+ trst_gpio_mode = MODE_GPIO(trst_gpio);
+ GPIO_SET = 1 << trst_gpio;
+ OUT_GPIO(trst_gpio);
+ }
+ if (srst_gpio != -1) {
+ srst_gpio_mode = MODE_GPIO(srst_gpio);
+ GPIO_SET = 1 << srst_gpio;
+ OUT_GPIO(srst_gpio);
+ }
+
+ LOG_DEBUG("saved pinmux settings: tck %d tms %d tdi %d "
+ "tdo %d trst %d srst %d", tck_gpio_mode, tms_gpio_mode,
+ tdi_gpio_mode, tdo_gpio_mode, trst_gpio_mode, srst_gpio_mode);
+
+ return ERROR_OK;
+}
+
+static int bcm2835gpio_quit(void)
+{
+ SET_MODE_GPIO(tdo_gpio, tdo_gpio_mode);
+ SET_MODE_GPIO(tdi_gpio, tdi_gpio_mode);
+ SET_MODE_GPIO(tck_gpio, tck_gpio_mode);
+ SET_MODE_GPIO(tms_gpio, tms_gpio_mode);
+ if (trst_gpio != -1)
+ SET_MODE_GPIO(trst_gpio, trst_gpio_mode);
+ if (srst_gpio != -1)
+ SET_MODE_GPIO(srst_gpio, srst_gpio_mode);
+
+ return ERROR_OK;
+}
projects / openocd / commitdiff