/***************************************************************************
* Copyright (C) 2005 by Dominic Rath *
* Dominic.Rath@gmx.de *
* *
* Copyright (C) 2007,2008 Øyvind Harboe *
* oyvind.harboe@zylin.com *
* *
* 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. *
***************************************************************************/
#ifndef JTAG_H
#define JTAG_H
#include "binarybuffer.h"
#include "log.h"
#ifdef _DEBUG_JTAG_IO_
#define DEBUG_JTAG_IO(expr ...) \
do { if (1) LOG_DEBUG(expr); } while (0)
#else
#define DEBUG_JTAG_IO(expr ...) \
do { if (0) LOG_DEBUG(expr); } while (0)
#endif
#ifndef DEBUG_JTAG_IOZ
#define DEBUG_JTAG_IOZ 64
#endif
/*-------------------------------------------------------*/
/**
* When given an array, compute its DIMension; in other words, the
* number of elements in the array
*/
#define DIM(x) (sizeof(x)/sizeof((x)[0]))
/** Calculate the number of bytes required to hold @a n TAP scan bits */
#define TAP_SCAN_BYTES(n) CEIL(n, 8)
/*------------------------------------------------------*/
/**
* Defines JTAG Test Access Port states.
*
* These definitions were gleaned from the ARM7TDMI-S Technical
* Reference Manual and validated against several other ARM core
* technical manuals.
*
* FIXME some interfaces require specific numbers be used, as they
* are handed-off directly to their hardware implementations.
* Fix those drivers to map as appropriate ... then pick some
* sane set of numbers here (where 0/uninitialized == INVALID).
*/
typedef enum tap_state
{
TAP_INVALID = -1,
#if BUILD_ZY1000
/* These are the old numbers. Leave as-is for now... */
TAP_RESET = 0, TAP_IDLE = 8,
TAP_DRSELECT = 1, TAP_DRCAPTURE = 2, TAP_DRSHIFT = 3, TAP_DREXIT1 = 4,
TAP_DRPAUSE = 5, TAP_DREXIT2 = 6, TAP_DRUPDATE = 7,
TAP_IRSELECT = 9, TAP_IRCAPTURE = 10, TAP_IRSHIFT = 11, TAP_IREXIT1 = 12,
TAP_IRPAUSE = 13, TAP_IREXIT2 = 14, TAP_IRUPDATE = 15,
#else
/* Proper ARM recommended numbers */
TAP_DREXIT2 = 0x0,
TAP_DREXIT1 = 0x1,
TAP_DRSHIFT = 0x2,
TAP_DRPAUSE = 0x3,
TAP_IRSELECT = 0x4,
TAP_DRUPDATE = 0x5,
TAP_DRCAPTURE = 0x6,
TAP_DRSELECT = 0x7,
TAP_IREXIT2 = 0x8,
TAP_IREXIT1 = 0x9,
TAP_IRSHIFT = 0xa,
TAP_IRPAUSE = 0xb,
TAP_IDLE = 0xc,
TAP_IRUPDATE = 0xd,
TAP_IRCAPTURE = 0xe,
TAP_RESET = 0x0f,
#endif
} tap_state_t;
/**
* Function tap_state_name
* Returns a string suitable for display representing the JTAG tap_state
*/
const char *tap_state_name(tap_state_t state);
/// Provides user-friendly name lookup of TAP states.
tap_state_t tap_state_by_name(const char *name);
/// The current TAP state of the pending JTAG command queue.
extern tap_state_t cmd_queue_cur_state;
/**
* This structure defines a single scan field in the scan. It provides
* fields for the field's width and pointers to scan input and output
* values.
*
* In addition, this structure includes a value and mask that is used by
* jtag_add_dr_scan_check() to validate the value that was scanned out.
*
* The allocated, modified, and intmp fields are internal work space.
*/
struct scan_field {
/// A pointer to the tap structure to which this field refers.
struct jtag_tap* tap;
/// The number of bits this field specifies (up to 32)
int num_bits;
/// A pointer to value to be scanned into the device
uint8_t* out_value;
/// A pointer to a 32-bit memory location for data scanned out
uint8_t* in_value;
/// The value used to check the data scanned out.
uint8_t* check_value;
/// The mask to go with check_value
uint8_t* check_mask;
/// in_value has been allocated for the queue
int allocated;
/// Indicates we modified the in_value.
int modified;
/// temporary storage for performing value checks synchronously
uint8_t intmp[4];
};
struct jtag_tap {
const char* chip;
const char* tapname;
const char* dotted_name;
int abs_chain_position;
/// Is this TAP disabled after JTAG reset?
bool disabled_after_reset;
/// Is this TAP currently enabled?
bool enabled;
int ir_length; /**< size of instruction register */
uint32_t ir_capture_value;
uint8_t* expected; /**< Capture-IR expected value */
uint32_t ir_capture_mask;
uint8_t* expected_mask; /**< Capture-IR expected mask */
uint32_t idcode; /**< device identification code */
/** not all devices have idcode,
* we'll discover this during chain examination */
bool hasidcode;
/// Array of expected identification codes */
uint32_t* expected_ids;
/// Number of expected identification codes
uint8_t expected_ids_cnt;
/// current instruction
uint8_t* cur_instr;
/// Bypass register selected
int bypass;
struct jtag_tap_event_action *event_action;
struct jtag_tap* next_tap;
};
void jtag_tap_init(struct jtag_tap *tap);
void jtag_tap_free(struct jtag_tap *tap);
struct jtag_tap* jtag_all_taps(void);
const char *jtag_tap_name(const struct jtag_tap *tap);
struct jtag_tap* jtag_tap_by_string(const char* dotted_name);
struct jtag_tap* jtag_tap_by_jim_obj(Jim_Interp* interp, Jim_Obj* obj);
struct jtag_tap* jtag_tap_next_enabled(struct jtag_tap* p);
unsigned jtag_tap_count_enabled(void);
unsigned jtag_tap_count(void);
/*
* - TRST_ASSERTED triggers two sets of callbacks, after operations to
* reset the scan chain -- via TMS+TCK signaling, or deasserting the
* nTRST signal -- are queued:
*
* + Callbacks in C code fire first, patching internal state
* + Then post-reset event scripts fire ... activating JTAG circuits
* via TCK cycles, exiting SWD mode via TMS sequences, etc
*
* During those callbacks, scan chain contents have not been validated.
* JTAG operations that address a specific TAP (primarily DR/IR scans)
* must *not* be queued.
*
* - TAP_EVENT_SETUP is reported after TRST_ASSERTED, and after the scan
* chain has been validated. JTAG operations including scans that
* target specific TAPs may be performed.
*
* - TAP_EVENT_ENABLE and TAP_EVENT_DISABLE implement TAP activation and
* deactivation outside the core using scripted code that understands
* the specific JTAG router type. They might be triggered indirectly
* from EVENT_SETUP operations.
*/
enum jtag_event {
JTAG_TRST_ASSERTED,
JTAG_TAP_EVENT_SETUP,
JTAG_TAP_EVENT_ENABLE,
JTAG_TAP_EVENT_DISABLE,
};
struct jtag_tap_event_action
{
enum jtag_event event;
Jim_Obj* body;
struct jtag_tap_event_action* next;
};
/**
* Defines the function signature requide for JTAG event callback
* functions, which are added with jtag_register_event_callback()
* and removed jtag_unregister_event_callback().
* @param event The event to handle.
* @param prive A pointer to data that was passed to
* jtag_register_event_callback().
* @returns Must return ERROR_OK on success, or an error code on failure.
*
* @todo Change to return void or define a use for its return code.
*/
typedef int (*jtag_event_handler_t)(enum jtag_event event, void* priv);
int jtag_register_event_callback(jtag_event_handler_t f, void *x);
int jtag_unregister_event_callback(jtag_event_handler_t f, void *x);
int jtag_call_event_callbacks(enum jtag_event event);
/// @returns The current JTAG speed setting.
int jtag_get_speed(void);
/**
* Given a @a speed setting, use the interface @c speed_div callback to
* adjust the setting.
* @param speed The speed setting to convert back to readable KHz.
* @returns ERROR_OK if the interface has not been initialized or on success;
* otherwise, the error code produced by the @c speed_div callback.
*/
int jtag_get_speed_readable(int *speed);
/// Attempt to configure the interface for the specified KHz.
int jtag_config_khz(unsigned khz);
/**
* Attempt to enable RTCK/RCLK. If that fails, fallback to the
* specified frequency.
*/
int jtag_config_rclk(unsigned fallback_speed_khz);
/// Retreives the clock speed of the JTAG interface in KHz.
unsigned jtag_get_speed_khz(void);
enum reset_types {
RESET_NONE = 0x0,
RESET_HAS_TRST = 0x1,
RESET_HAS_SRST = 0x2,
RESET_TRST_AND_SRST = 0x3,
RESET_SRST_PULLS_TRST = 0x4,
RESET_TRST_PULLS_SRST = 0x8,
RESET_TRST_OPEN_DRAIN = 0x10,
RESET_SRST_PUSH_PULL = 0x20,
RESET_SRST_NO_GATING = 0x40,
};
enum reset_types jtag_get_reset_config(void);
void jtag_set_reset_config(enum reset_types type);
void jtag_set_nsrst_delay(unsigned delay);
unsigned jtag_get_nsrst_delay(void);
void jtag_set_ntrst_delay(unsigned delay);
unsigned jtag_get_ntrst_delay(void);
void jtag_set_nsrst_assert_width(unsigned delay);
unsigned jtag_get_nsrst_assert_width(void);
void jtag_set_ntrst_assert_width(unsigned delay);
unsigned jtag_get_ntrst_assert_width(void);
/// @returns The current state of TRST.
int jtag_get_trst(void);
/// @returns The current state of SRST.
int jtag_get_srst(void);
/// Enable or disable data scan verification checking.
void jtag_set_verify(bool enable);
/// @returns True if data scan verification will be performed.
bool jtag_will_verify(void);
/// Enable or disable verification of IR scan checking.
void jtag_set_verify_capture_ir(bool enable);
/// @returns True if IR scan verification will be performed.
bool jtag_will_verify_capture_ir(void);
/**
* Initialize interface upon startup. Return a successful no-op upon
* subsequent invocations.
*/
int jtag_interface_init(struct command_context_s* cmd_ctx);
/// Shutdown the JTAG interface upon program exit.
int jtag_interface_quit(void);
/**
* Initialize JTAG chain using only a RESET reset. If init fails,
* try reset + init.
*/
int jtag_init(struct command_context_s* cmd_ctx);
/// reset, then initialize JTAG chain
int jtag_init_reset(struct command_context_s* cmd_ctx);
int jtag_register_commands(struct command_context_s* cmd_ctx);
int jtag_init_inner(struct command_context_s *cmd_ctx);
/**
* @file
* The JTAG interface can be implemented with a software or hardware fifo.
*
* TAP_DRSHIFT and TAP_IRSHIFT are illegal end states; however,
* TAP_DRSHIFT/IRSHIFT can be emulated as end states, by using longer
* scans.
*
* Code that is relatively insensitive to the path taken through state
* machine (as long as it is JTAG compliant) can use @a endstate for
* jtag_add_xxx_scan(). Otherwise, the pause state must be specified as
* end state and a subsequent jtag_add_pathmove() must be issued.
*/
/**
* Generate an IR SCAN with a list of scan fields with one entry for
* each enabled TAP.
*
* If the input field list contains an instruction value for a TAP then
* that is used otherwise the TAP is set to bypass.
*
* TAPs for which no fields are passed are marked as bypassed for
* subsequent DR SCANs.
*
*/
void jtag_add_ir_scan(int num_fields,
struct scan_field* fields, tap_state_t endstate);
/**
* The same as jtag_add_ir_scan except no verification is performed out
* the output values.
*/
void jtag_add_ir_scan_noverify(int num_fields,
const struct scan_field *fields, tap_state_t state);
/**
* Duplicate the scan fields passed into the function into an IR SCAN
* command. This function assumes that the caller handles extra fields
* for bypassed TAPs.
*/
void jtag_add_plain_ir_scan(int num_fields,
const struct scan_field* fields, tap_state_t endstate);
/**
* Set in_value to point to 32 bits of memory to scan into. This
* function is a way to handle the case of synchronous and asynchronous
* JTAG queues.
*
* In the event of an asynchronous queue execution the queue buffer
* allocation method is used, for the synchronous case the temporary 32
* bits come from the input field itself.
*/
void jtag_alloc_in_value32(struct scan_field *field);
/**
* Generate a DR SCAN using the fields passed to the function.
* For connected TAPs, the function checks in_fields and uses fields
* specified there. For bypassed TAPs, the function generates a dummy
* 1-bit field. The bypass status of TAPs is set by jtag_add_ir_scan().
*/
void jtag_add_dr_scan(int num_fields,
const struct scan_field* fields, tap_state_t endstate);
/// A version of jtag_add_dr_scan() that uses the check_value/mask fields
void jtag_add_dr_scan_check(int num_fields,
struct scan_field* fields, tap_state_t endstate);
/**
* Duplicate the scan fields passed into the function into a DR SCAN
* command. Unlike jtag_add_dr_scan(), this function assumes that the
* caller handles extra fields for bypassed TAPs.
*/
void jtag_add_plain_dr_scan(int num_fields,
const struct scan_field* fields, tap_state_t endstate);
/**
* Defines the type of data passed to the jtag_callback_t interface.
* The underlying type must allow storing an @c int or pointer type.
*/
typedef intptr_t jtag_callback_data_t;
/**
* Defines a simple JTAG callback that can allow conversions on data
* scanned in from an interface.
*
* This callback should only be used for conversion that cannot fail.
* For conversion types or checks that can fail, use the more complete
* variant: jtag_callback_t.
*/
typedef void (*jtag_callback1_t)(jtag_callback_data_t data0);
/// A simpler version of jtag_add_callback4().
void jtag_add_callback(jtag_callback1_t, jtag_callback_data_t data0);
/**
* Defines the interface of the JTAG callback mechanism.
*
* @param in the pointer to the data clocked in
* @param data1 An integer big enough to use as an @c int or a pointer.
* @param data2 An integer big enough to use as an @c int or a pointer.
* @param data3 An integer big enough to use as an @c int or a pointer.
* @returns an error code
*/
typedef int (*jtag_callback_t)(jtag_callback_data_t data0,
jtag_callback_data_t data1,
jtag_callback_data_t data2,
jtag_callback_data_t data3);
/**
* This callback can be executed immediately the queue has been flushed.
*
* The JTAG queue can be executed synchronously or asynchronously.
* Typically for USB, the queue is executed asynchronously. For
* low-latency interfaces, the queue may be executed synchronously.
*
* The callback mechanism is very general and does not make many
* assumptions about what the callback does or what its arguments are.
* These callbacks are typically executed *after* the *entire* JTAG
* queue has been executed for e.g. USB interfaces, and they are
* guaranteeed to be invoked in the order that they were queued.
*
* If the execution of the queue fails before the callbacks, then --
* depending on driver implementation -- the callbacks may or may not be
* invoked. @todo Can we make this behavior consistent?
*
* The strange name is due to C's lack of overloading using function
* arguments.
*
* @param f The callback function to add.
* @param data0 Typically used to point to the data to operate on.
* Frequently this will be the data clocked in during a shift operation.
* @param data1 An integer big enough to use as an @c int or a pointer.
* @param data2 An integer big enough to use as an @c int or a pointer.
* @param data3 An integer big enough to use as an @c int or a pointer.
*
*/
void jtag_add_callback4(jtag_callback_t f, jtag_callback_data_t data0,
jtag_callback_data_t data1, jtag_callback_data_t data2,
jtag_callback_data_t data3);
/**
* Run a TAP_RESET reset where the end state is TAP_RESET,
* regardless of the start state.
*/
void jtag_add_tlr(void);
/**
* Application code *must* assume that interfaces will
* implement transitions between states with different
* paths and path lengths through the state diagram. The
* path will vary across interface and also across versions
* of the same interface over time. Even if the OpenOCD code
* is unchanged, the actual path taken may vary over time
* and versions of interface firmware or PCB revisions.
*
* Use jtag_add_pathmove() when specific transition sequences
* are required.
*
* Do not use jtag_add_pathmove() unless you need to, but do use it
* if you have to.
*
* DANGER! If the target is dependent upon a particular sequence
* of transitions for things to work correctly(e.g. as a workaround
* for an errata that contradicts the JTAG standard), then pathmove
* must be used, even if some jtag interfaces happen to use the
* desired path. Worse, the jtag interface used for testing a
* particular implementation, could happen to use the "desired"
* path when transitioning to/from end
* state.
*
* A list of unambigious single clock state transitions, not
* all drivers can support this, but it is required for e.g.
* XScale and Xilinx support
*
* Note! TAP_RESET must not be used in the path!
*
* Note that the first on the list must be reachable
* via a single transition from the current state.
*
* All drivers are required to implement jtag_add_pathmove().
* However, if the pathmove sequence can not be precisely
* executed, an interface_jtag_add_pathmove() or jtag_execute_queue()
* must return an error. It is legal, but not recommended, that
* a driver returns an error in all cases for a pathmove if it
* can only implement a few transitions and therefore
* a partial implementation of pathmove would have little practical
* application.
*
* If an error occurs, jtag_error will contain one of these error codes:
* - ERROR_JTAG_NOT_STABLE_STATE -- The final state was not stable.
* - ERROR_JTAG_STATE_INVALID -- The path passed through TAP_RESET.
* - ERROR_JTAG_TRANSITION_INVALID -- The path includes invalid
* state transitions.
*/
void jtag_add_pathmove(int num_states, const tap_state_t* path);
/**
* jtag_add_statemove() moves from the current state to @a goal_state.
*
* @param goal_state The final TAP state.
* @return ERROR_OK on success, or an error code on failure.
*
* Moves from the current state to the goal \a state.
* Both states must be stable.
*/
int jtag_add_statemove(tap_state_t goal_state);
/**
* Goes to TAP_IDLE (if we're not already there), cycle
* precisely num_cycles in the TAP_IDLE state, after which move
* to @a endstate (unless it is also TAP_IDLE).
*
* @param num_cycles Number of cycles in TAP_IDLE state. This argument
* may be 0, in which case this routine will navigate to @a endstate
* via TAP_IDLE.
* @param endstate The final state.
*/
void jtag_add_runtest(int num_cycles, tap_state_t endstate);
/**
* A reset of the TAP state machine can be requested.
*
* Whether tms or trst reset is used depends on the capabilities of
* the target and jtag interface(reset_config command configures this).
*
* srst can driver a reset of the TAP state machine and vice
* versa
*
* Application code may need to examine value of jtag_reset_config
* to determine the proper codepath
*
* DANGER! Even though srst drives trst, trst might not be connected to
* the interface, and it might actually be *harmful* to assert trst in this case.
*
* This is why combinations such as "reset_config srst_only srst_pulls_trst"
* are supported.
*
* only req_tlr_or_trst and srst can have a transition for a
* call as the effects of transitioning both at the "same time"
* are undefined, but when srst_pulls_trst or vice versa,
* then trst & srst *must* be asserted together.
*/
void jtag_add_reset(int req_tlr_or_trst, int srst);
/**
* Function jtag_set_end_state
*
* Set a global variable to \a state if \a state != TAP_INVALID.
*
* Return the value of the global variable.
*
**/
tap_state_t jtag_set_end_state(tap_state_t state);
/**
* Function jtag_get_end_state
*
* Return the value of the global variable for end state
*
**/
tap_state_t jtag_get_end_state(void);
void jtag_add_sleep(uint32_t us);
/**
* Function jtag_add_stable_clocks
* first checks that the state in which the clocks are to be issued is
* stable, then queues up clock_count clocks for transmission.
*/
void jtag_add_clocks(int num_cycles);
/**
* For software FIFO implementations, the queued commands can be executed
* during this call or earlier. A sw queue might decide to push out
* some of the jtag_add_xxx() operations once the queue is "big enough".
*
* This fn will return an error code if any of the prior jtag_add_xxx()
* calls caused a failure, e.g. check failure. Note that it does not
* matter if the operation was executed *before* jtag_execute_queue(),
* jtag_execute_queue() will still return an error code.
*
* All jtag_add_xxx() calls that have in_handler != NULL will have been
* executed when this fn returns, but if what has been queued only
* clocks data out, without reading anything back, then JTAG could
* be running *after* jtag_execute_queue() returns. The API does
* not define a way to flush a hw FIFO that runs *after*
* jtag_execute_queue() returns.
*
* jtag_add_xxx() commands can either be executed immediately or
* at some time between the jtag_add_xxx() fn call and jtag_execute_queue().
*/
int jtag_execute_queue(void);
/// same as jtag_execute_queue() but does not clear the error flag
void jtag_execute_queue_noclear(void);
/// @returns the number of times the scan queue has been flushed
int jtag_get_flush_queue_count(void);
/// Report Tcl event to all TAPs
void jtag_notify_event(enum jtag_event);
/* can be implemented by hw + sw */
int jtag_power_dropout(int* dropout);
int jtag_srst_asserted(int* srst_asserted);
/* JTAG support functions */
/**
* Execute jtag queue and check value with an optional mask.
* @param field Pointer to scan field.
* @param value Pointer to scan value.
* @param mask Pointer to scan mask; may be NULL.
* @returns Nothing, but calls jtag_set_error() on any error.
*/
void jtag_check_value_mask(struct scan_field *field, uint8_t *value, uint8_t *mask);
void jtag_sleep(uint32_t us);
/*
* The JTAG subsystem defines a number of error codes,
* using codes between -100 and -199.
*/
#define ERROR_JTAG_INIT_FAILED (-100)
#define ERROR_JTAG_INVALID_INTERFACE (-101)
#define ERROR_JTAG_NOT_IMPLEMENTED (-102)
#define ERROR_JTAG_TRST_ASSERTED (-103)
#define ERROR_JTAG_QUEUE_FAILED (-104)
#define ERROR_JTAG_NOT_STABLE_STATE (-105)
#define ERROR_JTAG_DEVICE_ERROR (-107)
#define ERROR_JTAG_STATE_INVALID (-108)
#define ERROR_JTAG_TRANSITION_INVALID (-109)
#define ERROR_JTAG_INIT_SOFT_FAIL (-110)
/**
* jtag_add_dr_out() is a version of jtag_add_dr_scan() which
* only scans data out. It operates on 32 bit integers instead
* of 8 bit, which makes it a better impedance match with
* the calling code which often operate on 32 bit integers.
*
* Current or end_state can not be TAP_RESET. end_state can be TAP_INVALID
*
* num_bits[i] is the number of bits to clock out from value[i] LSB first.
*
* If the device is in bypass, then that is an error condition in
* the caller code that is not detected by this fn, whereas
* jtag_add_dr_scan() does detect it. Similarly if the device is not in
* bypass, data must be passed to it.
*
* If anything fails, then jtag_error will be set and jtag_execute() will
* return an error. There is no way to determine if there was a failure
* during this function call.
*
* This is an inline fn to speed up embedded hosts. Also note that
* interface_jtag_add_dr_out() can be a *small* inline function for
* embedded hosts.
*
* There is no jtag_add_dr_outin() version of this fn that also allows
* clocking data back in. Patches gladly accepted!
*/
void jtag_add_dr_out(struct jtag_tap* tap,
int num_fields, const int* num_bits, const uint32_t* value,
tap_state_t end_state);
/**
* Set the current JTAG core execution error, unless one was set
* by a previous call previously. Driver or application code must
* use jtag_error_clear to reset jtag_error once this routine has been
* called with a non-zero error code.
*/
void jtag_set_error(int error);
/// @returns The current value of jtag_error
int jtag_get_error(void);
/**
* Resets jtag_error to ERROR_OK, returning its previous value.
* @returns The previous value of @c jtag_error.
*/
int jtag_error_clear(void);
/**
* Return true if it's safe for a background polling task to access the
* JTAG scan chain. Polling may be explicitly disallowed, and is also
* unsafe while nTRST is active or the JTAG clock is gated off.,
*/
bool is_jtag_poll_safe(void);
/**
* Return flag reporting whether JTAG polling is disallowed.
*/
bool jtag_poll_get_enabled(void);
/**
* Assign flag reporting whether JTAG polling is disallowed.
*/
void jtag_poll_set_enabled(bool value);
#endif /* JTAG_H */
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