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// 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;
}
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