264 lines
6.0 KiB
C
264 lines
6.0 KiB
C
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/* MSPDebug - gpio device interface
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* Copyright (C) 2014 TTI GmbH - TGU Smartmote
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* Author(s): Jan Willeke (willeke@smartmote.de)
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*
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* Linux /sys/class/gpio interface to msp430 jtag
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* inspired by urjtag and jtdev.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include "jtdev.h"
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#include "output.h"
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#if defined(__linux__) || \
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( defined(__FreeBSD__) || defined(__DragonFly__) )
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/*===== includes =============================================================*/
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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#include "gpio.h"
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/* pin mapping */
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enum {
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GPIO_TDI = 0,
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GPIO_TCK,
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GPIO_TMS,
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GPIO_TDO,
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GPIO_REQUIRED
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};
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unsigned int jtag_gpios[4];
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int fd_gpios[4];
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static int
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gpio_open ()
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{
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int i, ret;
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/* Export all gpios */
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for (i = 0; i < GPIO_REQUIRED; i++)
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{
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unsigned int gpio = jtag_gpios[i];
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ret = gpio_export (gpio);
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if (ret)
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{
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printf("gpio[%d] %u cannot be exported\n", i, gpio);
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return -1;
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}
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gpio_set_dir (gpio, (i == GPIO_TDO) ? 0 : 1);
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fd_gpios[i] = gpio_open_fd(gpio);
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if (fd_gpios[i] < 0)
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{
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printf("gpio: cannot open gpio[%d] %u\n", i, gpio);
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return -1;
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}
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}
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return 0;
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}
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static int
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gpio_parse_config (const char *params)
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{
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struct option{
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char* name;
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int num;
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};
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static const struct option ops[] = {
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{"tms=",GPIO_TMS},
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{"tdi=",GPIO_TDI},
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{"tdo=",GPIO_TDO},
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{"tck=",GPIO_TCK}
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};
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int i;
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for( i = 0;i < 4; i++) {
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char* help;
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help = strstr(params,ops[i].name);
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if (help)
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jtag_gpios[ops[i].num] = atoi(help+4);
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else
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return -1;
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printf("gpio %s %d\n", ops[i].name,jtag_gpios[ops[i].num]);
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}
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return 0;
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}
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static int jtgpio_open(struct jtdev *p, const char *device)
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{
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if (gpio_parse_config(device)){
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printf("gpio: failed parsing parameters\n");
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return -1;
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}
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return gpio_open();
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}
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static void jtgpio_close(struct jtdev *p)
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{
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int i;
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printf("JTAG_CLOSE\n");
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for (i = 0; i < GPIO_REQUIRED; i++)
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{
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if (fd_gpios[i])
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close (fd_gpios[i]);
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gpio_unexport (jtag_gpios[i]);
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}
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}
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static void jtgpio_power_on(struct jtdev *p)
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{
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printf("JTAG_power on\n");
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}
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static void jtgpio_power_off(struct jtdev *p)
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{
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printf("JTAG_power off\n");
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}
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static void jtgpio_connect(struct jtdev *p)
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{
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printf("JTAG_connct \n");
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}
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static void jtgpio_release(struct jtdev *p)
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{
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printf("JTAG_release\n");
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}
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static void jtgpio_tck(struct jtdev *p, int out)
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{
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gpio_set_value_fd (fd_gpios[GPIO_TCK], out);
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}
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static void jtgpio_tms(struct jtdev *p, int out)
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{
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gpio_set_value_fd (fd_gpios[GPIO_TMS], out);
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}
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static void jtgpio_tdi(struct jtdev *p, int out)
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{
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gpio_set_value_fd (fd_gpios[GPIO_TDI], out);
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}
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static void jtgpio_rst(struct jtdev *p, int out)
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{
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printf("jtag_reset\n");
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}
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static void jtgpio_tst(struct jtdev *p, int out)
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{
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printf("jtag_test\n");
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}
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static int jtgpio_tdo_get(struct jtdev *p)
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{
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return gpio_get_value_fd (fd_gpios[GPIO_TDO],
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jtag_gpios[GPIO_TDO]);
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}
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static void jtgpio_tclk(struct jtdev *p, int out)
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{
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gpio_set_value_fd (fd_gpios[GPIO_TDI], out);
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}
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static int jtgpio_tclk_get(struct jtdev *p)
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{
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return gpio_get_value_fd (fd_gpios[GPIO_TDI],
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jtag_gpios[GPIO_TDI]);
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}
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static void jtgpio_tclk_strobe(struct jtdev *p, unsigned int count)
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{
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int i;
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for (i=0;i<count;i++){
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gpio_set_value_fd (fd_gpios[GPIO_TDI], 1);
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gpio_set_value_fd (fd_gpios[GPIO_TDI], 0);
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}
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}
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static void jtgpio_led_green(struct jtdev *p, int out)
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{
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printf("led green\n");
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}
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static void jtgpio_led_red(struct jtdev *p, int out)
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{
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printf("led red\n");
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}
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#else /* __linux__ */
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static int jtgpio_open(struct jtdev *p, const char *device)
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{
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printc_err("jtdev: driver is not supported on this platform\n");
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p->failed = 1;
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return -1;
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}
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static void jtgpio_close(struct jtdev *p) { }
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static void jtgpio_power_on(struct jtdev *p) { }
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static void jtgpio_power_off(struct jtdev *p) { }
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static void jtgpio_connect(struct jtdev *p) { }
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static void jtgpio_release(struct jtdev *p) { }
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static void jtgpio_tck(struct jtdev *p, int out) { }
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static void jtgpio_tms(struct jtdev *p, int out) { }
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static void jtgpio_tdi(struct jtdev *p, int out) { }
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static void jtgpio_rst(struct jtdev *p, int out) { }
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static void jtgpio_tst(struct jtdev *p, int out) { }
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static int jtgpio_tdo_get(struct jtdev *p) { return 0; }
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static void jtgpio_tclk(struct jtdev *p, int out) { }
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static int jtgpio_tclk_get(struct jtdev *p) { return 0; }
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static void jtgpio_tclk_strobe(struct jtdev *p, unsigned int count) { }
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static void jtgpio_led_green(struct jtdev *p, int out) { }
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static void jtgpio_led_red(struct jtdev *p, int out) { }
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#endif
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const struct jtdev_func jtdev_func_gpio = {
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.jtdev_open = jtgpio_open,
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.jtdev_close = jtgpio_close,
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.jtdev_power_on = jtgpio_power_on,
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.jtdev_power_off = jtgpio_power_off,
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.jtdev_connect = jtgpio_connect,
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.jtdev_release = jtgpio_release,
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.jtdev_tck = jtgpio_tck,
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.jtdev_tms = jtgpio_tms,
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.jtdev_tdi = jtgpio_tdi,
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.jtdev_rst = jtgpio_rst,
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.jtdev_tst = jtgpio_tst,
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.jtdev_tdo_get = jtgpio_tdo_get,
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.jtdev_tclk = jtgpio_tclk,
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.jtdev_tclk_get = jtgpio_tclk_get,
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.jtdev_tclk_strobe = jtgpio_tclk_strobe,
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.jtdev_led_green = jtgpio_led_green,
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.jtdev_led_red = jtgpio_led_red
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};
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