stm32f1: jtag: add command to enable/disable JTAG

include/shell/jtag.h

@@ -0,0 +1,3 @@
+#pragma once
+
+int shell_jtag(struct console *con, size_t argc, const char **argv);

source/shell/jtag.c

@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <libopencm3/stm32/gpio.h>
+
+#include <console.h>
+
+int shell_jtag(struct console *con, size_t argc, const char **argv)
+{
+	int state = 0;
+
+	(void)con;
+
+	if (argc >= 2) {
+		state = (strcmp(argv[1], "on") == 0);
+	}
+
+	if (state) {
+		gpio_primary_remap(AFIO_MAPR_SWJ_CFG_FULL_SWJ,
+			AFIO_MAPR_TIM2_REMAP_PARTIAL_REMAP1);
+	} else {
+		gpio_primary_remap(AFIO_MAPR_SWJ_CFG_JTAG_OFF_SW_ON,
+			AFIO_MAPR_TIM2_REMAP_PARTIAL_REMAP1);
+	}
+
+	return 0;
+}