1 files changed, 153 insertions, 0 deletions
diff --git a/src/jtag/swim.c b/src/jtag/swim.c
new file mode 100644
index 0000000..936268b
--- /dev/null
+++ b/src/jtag/swim.c
@@ -0,0 +1,153 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/*
+ * Copyright (C) 2020 by Antonio Borneo <borneo.antonio@gmail.com
+ *
+ * SWIM (Single Wire Interface Module) is a low-pin-count debug protocol
+ * used by STMicroelectronics MCU family STM8 and documented in UM470
+ * https://www.st.com/resource/en/user_manual/cd00173911.pdf
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "interface.h"
+#include "swim.h"
+#include <helper/command.h>
+#include <transport/transport.h>
+
+extern struct adapter_driver *adapter_driver;
+
+int swim_system_reset(void)
+{
+	assert(adapter_driver->swim_ops);
+
+	return adapter_driver->swim_ops->srst();
+}
+
+int swim_read_mem(uint32_t addr, uint32_t size, uint32_t count,
+				  uint8_t *buffer)
+{
+	assert(adapter_driver->swim_ops);
+
+	return adapter_driver->swim_ops->read_mem(addr, size, count, buffer);
+}
+
+int swim_write_mem(uint32_t addr, uint32_t size, uint32_t count,
+				   const uint8_t *buffer)
+{
+	assert(adapter_driver->swim_ops);
+
+	return adapter_driver->swim_ops->write_mem(addr, size, count, buffer);
+}
+
+int swim_reconnect(void)
+{
+	assert(adapter_driver->swim_ops);
+
+	return adapter_driver->swim_ops->reconnect();
+}
+
+COMMAND_HANDLER(handle_swim_newtap_command)
+{
+	struct jtag_tap *tap;
+
+	/*
+	 * only need "basename" and "tap_type", but for backward compatibility
+	 * ignore extra parameters
+	 */
+	if (CMD_ARGC < 2)
+		return ERROR_COMMAND_SYNTAX_ERROR;
+
+	tap = calloc(1, sizeof(*tap));
+	if (!tap) {
+		LOG_ERROR("Out of memory");
+		return ERROR_FAIL;
+	}
+
+	tap->chip = strdup(CMD_ARGV[0]);
+	tap->tapname = strdup(CMD_ARGV[1]);
+	tap->dotted_name = alloc_printf("%s.%s", CMD_ARGV[0], CMD_ARGV[1]);
+	if (!tap->chip || !tap->tapname || !tap->dotted_name) {
+		LOG_ERROR("Out of memory");
+		free(tap->dotted_name);
+		free(tap->tapname);
+		free(tap->chip);
+		free(tap);
+		return ERROR_FAIL;
+	}
+
+	LOG_DEBUG("Creating new SWIM \"tap\", Chip: %s, Tap: %s, Dotted: %s",
+			  tap->chip, tap->tapname, tap->dotted_name);
+
+	/* default is enabled-after-reset */
+	tap->enabled = true;
+
+	jtag_tap_init(tap);
+	return ERROR_OK;
+}
+
+static const struct command_registration swim_transport_subcommand_handlers[] = {
+	{
+		.name = "newtap",
+		.handler = handle_swim_newtap_command,
+		.mode = COMMAND_CONFIG,
+		.help = "Create a new TAP instance named basename.tap_type, "
+				"and appends it to the scan chain.",
+		.usage = "basename tap_type",
+	},
+	COMMAND_REGISTRATION_DONE
+};
+
+static const struct command_registration swim_transport_command_handlers[] = {
+	{
+		.name = "swim",
+		.mode = COMMAND_ANY,
+		.help = "perform swim adapter actions",
+		.usage = "",
+		.chain = swim_transport_subcommand_handlers,
+	},
+	COMMAND_REGISTRATION_DONE
+};
+
+static int swim_transport_select(struct command_context *cmd_ctx)
+{
+	LOG_DEBUG(__func__);
+
+	return register_commands(cmd_ctx, NULL, swim_transport_command_handlers);
+}
+
+static int swim_transport_init(struct command_context *cmd_ctx)
+{
+	enum reset_types jtag_reset_config = jtag_get_reset_config();
+
+	LOG_DEBUG(__func__);
+
+	if (jtag_reset_config & RESET_CNCT_UNDER_SRST) {
+		if (jtag_reset_config & RESET_SRST_NO_GATING)
+			adapter_assert_reset();
+		else
+			LOG_WARNING("\'srst_nogate\' reset_config option is required");
+	} else
+		adapter_deassert_reset();
+
+	return ERROR_OK;
+}
+
+static struct transport swim_transport = {
+	.name = "swim",
+	.select = swim_transport_select,
+	.init = swim_transport_init,
+};
+
+static void swim_constructor(void) __attribute__ ((constructor));
+static void swim_constructor(void)
+{
+	transport_register(&swim_transport);
+}
+
+bool transport_is_swim(void)
+{
+	return get_current_transport() == &swim_transport;
+}