/*-----<Macros>--------------------------------------------------*/
-/** When given an array, compute its DIMension, i.e. number of elements in the array */
+/**
+ * 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 */
/*-----</Macros>-------------------------------------------------*/
-
-
-/*
- * Tap states from ARM7TDMI-S Technical reference manual.
- * Also, validated against several other ARM core technical manuals.
- *
- * N.B. tap_get_tms_path() was changed to reflect this corrected
- * numbering and ordering of the TAP states.
- *
- * DANGER!!!! some interfaces care about the actual numbers used
- * as they are handed off directly to hardware implementations.
+/**
+ * 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. tap_get_tms_path() is sensitive to this numbering
+ * and ordering of the TAP states; furthermore, some interfaces require
+ * specific numbers be used, as they are handed-off directly to their
+ * hardware implementations.
*/
-
typedef enum tap_state
{
#if BUILD_ECOSBOARD
-/* These are the old numbers. Leave as-is for now... */
+ /* 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,
*/
const char* tap_state_name(tap_state_t state);
+/// The current TAP state of the pending JTAG command queue.
+extern tap_state_t cmd_queue_cur_state;
+/// The TAP state in which DR scans should end.
+extern tap_state_t cmd_queue_end_state;
-extern tap_state_t cmd_queue_end_state; /* finish DR scans in dr_end_state */
-extern tap_state_t cmd_queue_cur_state; /* current TAP 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.
+ */
typedef struct scan_field_s
{
- jtag_tap_t* tap; /* tap pointer this instruction refers to */
- int num_bits; /* number of bits this field specifies (up to 32) */
- u8* out_value; /* value to be scanned into the device */
- u8* in_value; /* pointer to a 32-bit memory location to take data scanned out */
-
- u8* check_value; /* Used together with jtag_add_dr_scan_check() to check data clocked
- in */
- u8* check_mask; /* mask to go with check_value */
-
- /* internal work space */
- int allocated; /* in_value has been allocated for the queue */
- int modified; /* did we modify the in_value? */
- u8 intmp[4]; /* temporary storage for checking synchronously */
+ /// A pointer to the tap structure to which this field refers.
+ jtag_tap_t* tap;
+
+ /// The number of bits this field specifies (up to 32)
+ int num_bits;
+ /// A pointer to value to be scanned into the device
+ u8* out_value;
+ /// A pointer to a 32-bit memory location for data scanned out
+ u8* in_value;
+
+ /// The value used to check the data scanned out.
+ u8* check_value;
+ /// The mask to go with check_value
+ u8* 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
+ u8 intmp[4];
} scan_field_t;
#ifdef INCLUDE_JTAG_INTERFACE_H
+/**
+ * The inferred type of a scan_command_s structure, indicating whether
+ * the command has the host scan in from the device, the host scan out
+ * to the device, or both.
+ */
enum scan_type {
- /* IN: from device to host, OUT: from host to device */
- SCAN_IN = 1, SCAN_OUT = 2, SCAN_IO = 3
+ /// From device to host,
+ SCAN_IN = 1,
+ /// From host to device,
+ SCAN_OUT = 2,
+ /// Full-duplex scan.
+ SCAN_IO = 3
};
+/**
+ * The scan_command provide a means of encapsulating a set of scan_field_s
+ * structures that should be scanned in/out to the device.
+ */
typedef struct scan_command_s
{
- bool ir_scan; /* instruction/not data scan */
- int num_fields; /* number of fields in *fields array */
- scan_field_t* fields; /* pointer to an array of data scan fields */
- tap_state_t end_state; /* TAP state in which JTAG commands should finish */
+ /// instruction/not data scan
+ bool ir_scan;
+ /// number of fields in *fields array
+ int num_fields;
+ /// pointer to an array of data scan fields
+ scan_field_t* fields;
+ /// state in which JTAG commands should finish
+ tap_state_t end_state;
} scan_command_t;
typedef struct statemove_command_s
{
- tap_state_t end_state; /* TAP state in which JTAG commands should finish */
+ /// state in which JTAG commands should finish
+ tap_state_t end_state;
} statemove_command_t;
typedef struct pathmove_command_s
{
- int num_states; /* number of states in *path */
- tap_state_t* path; /* states that have to be passed */
+ /// number of states in *path
+ int num_states;
+ /// states that have to be passed
+ tap_state_t* path;
} pathmove_command_t;
typedef struct runtest_command_s
{
- int num_cycles; /* number of cycles that should be spent in Run-Test/Idle */
- tap_state_t end_state; /* TAP state in which JTAG commands should finish */
+ /// number of cycles to spend in Run-Test/Idle state
+ int num_cycles;
+ /// state in which JTAG commands should finish
+ tap_state_t end_state;
} runtest_command_t;
typedef struct stableclocks_command_s
{
- int num_cycles; /* number of clock cycles that should be sent */
+ /// number of clock cycles that should be sent
+ int num_cycles;
} stableclocks_command_t;
typedef struct reset_command_s
{
- int trst; /* trst/srst 0: deassert, 1: assert, -1: don't change */
+ /// Set TRST output: 0=deassert, 1=assert, -1=no change
+ int trst;
+ /// Set SRST output: 0=deassert, 1=assert, -1=no change
int srst;
} reset_command_t;
typedef struct end_state_command_s
{
- tap_state_t end_state; /* TAP state in which JTAG commands should finish */
+ /// state in which JTAG commands should finish
+ tap_state_t end_state;
} end_state_command_t;
typedef struct sleep_command_s
{
- u32 us; /* number of microseconds to sleep */
+ /// number of microseconds to sleep
+ u32 us;
} sleep_command_t;
+/**
+ * Defines a container type that hold a pointer to a JTAG command
+ * structure of any defined type.
+ */
typedef union jtag_command_container_u
{
scan_command_t* scan;
sleep_command_t* sleep;
} jtag_command_container_t;
+/**
+ * The type of the @c jtag_command_container_u contained by a
+ * @c jtag_command_s structure.
+ */
enum jtag_command_type {
JTAG_SCAN = 1,
JTAG_STATEMOVE = 2,
struct jtag_command_s* next;
} jtag_command_t;
+/// The current queue of jtag_command_s structures.
extern jtag_command_t* jtag_command_queue;
extern void* cmd_queue_alloc(size_t size);
#endif // INCLUDE_JTAG_INTERFACE_H
-/* forward declaration */
typedef struct jtag_tap_event_action_s jtag_tap_event_action_t;
/* this is really: typedef jtag_tap_t */
const char* chip;
const char* tapname;
const char* dotted_name;
- int abs_chain_position;
- int enabled;
- int ir_length; /* size of instruction register */
- u32 ir_capture_value;
- u8* expected; /* Capture-IR expected value */
- u32 ir_capture_mask;
- u8* expected_mask; /* Capture-IR expected mask */
- u32 idcode; /* device identification code */
- u32* expected_ids; /* Array of expected identification codes */
- u8 expected_ids_cnt; /* Number of expected identification codes */
- u8* cur_instr; /* current instruction */
- int bypass; /* bypass register selected */
-
- jtag_tap_event_action_t* event_action;
+ int abs_chain_position;
+ /// Is this TAP enabled?
+ int enabled;
+ int ir_length; /**< size of instruction register */
+ u32 ir_capture_value;
+ u8* expected; /**< Capture-IR expected value */
+ u32 ir_capture_mask;
+ u8* expected_mask; /**< Capture-IR expected mask */
+ u32 idcode;
+ /**< device identification code */
+
+ /// Array of expected identification codes */
+ u32* expected_ids;
+ /// Number of expected identification codes
+ u8 expected_ids_cnt;
+
+ /// current instruction
+ u8* cur_instr;
+ /// Bypass register selected
+ int bypass;
+
+ jtag_tap_event_action_t *event_action;
jtag_tap_t* next_tap;
};
extern jtag_tap_t* jtag_TapByString(const char* dotted_name);
extern jtag_tap_t* jtag_TapByJimObj(Jim_Interp* interp, Jim_Obj* obj);
extern jtag_tap_t* jtag_TapByAbsPosition(int abs_position);
-extern int jtag_NumEnabledTaps(void);
-extern int jtag_NumTotalTaps(void);
+extern int jtag_NumEnabledTaps(void);
+extern int jtag_NumTotalTaps(void);
static __inline__ jtag_tap_t* jtag_NextEnabledTap(jtag_tap_t* p)
{
extern enum reset_types jtag_reset_config;
-/* initialize interface upon startup. A successful no-op
- * upon subsequent invocations
+/**
+ * Initialize interface upon startup. Return a successful no-op upon
+ * subsequent invocations.
*/
extern int jtag_interface_init(struct command_context_s* cmd_ctx);
/// Shutdown the JTAG interface upon program exit.
extern int jtag_interface_quit(void);
-/* initialize JTAG chain using only a RESET reset. If init fails,
+/**
+ * Initialize JTAG chain using only a RESET reset. If init fails,
* try reset + init.
*/
extern int jtag_init(struct command_context_s* cmd_ctx);
-/* reset, then initialize JTAG chain */
+/// reset, then initialize JTAG chain
extern int jtag_init_reset(struct command_context_s* cmd_ctx);
extern int jtag_register_commands(struct command_context_s* cmd_ctx);
-/* JTAG interface, can be implemented with a software or hardware fifo
- *
- * TAP_DRSHIFT and TAP_IRSHIFT are illegal end states. TAP_DRSHIFT/IRSHIFT as end states
- * can be emulated by using a larger scan.
+/**
+ * @file
+ * The JTAG interface can be implemented with a software or hardware fifo.
*
- * Code that is relatively insensitive to the path(as long
- * as it is JTAG compliant) taken through state machine can use
- * 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.
+ * 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.
*/
+
extern void jtag_add_ir_scan(int num_fields, scan_field_t* fields, tap_state_t endstate);
-/* same as jtag_add_ir_scan except no verify is performed */
+/**
+ * The same as jtag_add_ir_scan except no verification is performed out
+ * the output values.
+ */
extern void jtag_add_ir_scan_noverify(int num_fields, const scan_field_t *fields, tap_state_t state);
-extern void jtag_add_dr_scan(int num_fields, const scan_field_t* 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
+
+/**
+ * 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.
+ * allocation method is used, for the synchronous case the temporary 32
+ * bits come from the input field itself.
*/
extern void jtag_alloc_in_value32(scan_field_t *field);
-/* This version of jtag_add_dr_scan() uses the check_value/mask fields */
+extern void jtag_add_dr_scan(int num_fields, const scan_field_t* fields, tap_state_t endstate);
+/// A version of jtag_add_dr_scan() that uses the check_value/mask fields
extern void jtag_add_dr_scan_check(int num_fields, scan_field_t* fields, tap_state_t endstate);
extern void jtag_add_plain_ir_scan(int num_fields, const scan_field_t* fields, tap_state_t endstate);
extern void jtag_add_plain_dr_scan(int num_fields, const scan_field_t* fields, tap_state_t endstate);
-/* Simplest/typical callback - do some conversion on the data clocked in.
- * This callback is for such conversion that can not fail.
- * For conversion types or checks that can
- * fail, use the jtag_callback_t variant */
+/**
+ * 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)(u8 *in);
-/* A simpler version of jtag_add_callback4 */
+/// A simpler version of jtag_add_callback4().
extern void jtag_add_callback(jtag_callback1_t, u8 *in);
-/* This type can store an integer safely by a normal cast on 64 and
- * 32 bit systems. */
+/**
+ * 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;
-/* The generic callback mechanism.
+/**
+ * Defines the interface of the JTAG callback mechanism.
*
- * The callback is invoked with three arguments. The first argument is
- * the pointer to the data clocked in.
+ * @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)(u8 *in, 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. Note that
- * the JTAG queue can either be executed synchronously or asynchronously. Typically
- * for USB the queue is executed asynchronously. For low latency interfaces, the
- * queue may be executed synchronously.
- *
- * These callbacks are typically executed *after* the *entire* JTAG queue has been
- * executed for e.g. USB interfaces.
- *
- * The callbacks are guaranteeed to be invoked in the order that they were queued.
- *
- * The strange name is due to C's lack of overloading using function arguments
+/**
+ * This callback can be executed immediately the queue has been flushed.
*
- * The callback mechansim is very general and does not really make any assumptions
- * about what the callback does and what the arguments are.
+ * 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.
*
- * in - typically used to point to the data to operate on. More often than not
- * this will be the data clocked in during a shift operation
+ * 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.
*
- * data1 - an integer that is big enough to be used either as an 'int' or
- * cast to/from a pointer
+ * 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?
*
- * data2 - an integer that is big enough to be used either as an 'int' or
- * cast to/from a pointer
+ * The strange name is due to C's lack of overloading using function
+ * arguments.
*
- * Why stop at 'data2' for arguments? Somewhat historical reasons. This is
- * sufficient to implement the jtag_check_value_mask(), besides the
- * line is best drawn somewhere...
+ * @param f The callback function to add.
+ * @param in 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.
*
- * If the execution of the queue fails before the callbacks, then the
- * callbacks may or may not be invoked depending on driver implementation.
*/
extern void jtag_add_callback4(jtag_callback_t, u8 *in,
jtag_callback_data_t data1, jtag_callback_data_t data2,
jtag_callback_data_t data3);
-/* run a TAP_RESET reset. End state is TAP_RESET, regardless
- * of start state.
+/**
+ * Run a TAP_RESET reset where the end state is TAP_RESET,
+ * regardless of the start state.
*/
extern void jtag_add_tlr(void);
-/* Application code *must* assume that interfaces will
+/**
+ * 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
*/
extern void jtag_add_pathmove(int num_states, const tap_state_t* path);
-/* go to TAP_IDLE, if we're not already there and cycle
- * precisely num_cycles in the TAP_IDLE after which move
- * to the end state, if it is != TAP_IDLE
- *
- * nb! num_cycles can be 0, in which case the fn will navigate
- * to endstate via TAP_IDLE
+/**
+ * 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.
*/
extern void jtag_add_runtest(int num_cycles, tap_state_t endstate);
-/* A reset of the TAP state machine can be requested.
+/**
+ * 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).
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".
* jtag_add_xxx() commands can either be executed immediately or
* at some time between the jtag_add_xxx() fn call and jtag_execute_queue().
*/
-extern int jtag_execute_queue(void);
+extern int jtag_execute_queue(void);
/* same as jtag_execute_queue() but does not clear the error flag */
extern void jtag_execute_queue_noclear(void);
-/* this flag is set when an error occurs while executing the queue. cleared
- * by jtag_execute_queue()
+/**
+ * The jtag_error variable is set when an error occurs while executing
+ * the queue.
*
- * this flag can also be set from application code if some error happens
+ * This flag can also be set from application code, if an error happens
* during processing that should be reported during jtag_execute_queue().
+ *
+ * It is cleared by jtag_execute_queue().
*/
extern int jtag_error;
/* can be implemented by hw+sw */
-extern int jtag_power_dropout(int* dropout);
-extern int jtag_srst_asserted(int* srst_asserted);
+extern int jtag_power_dropout(int* dropout);
+extern int jtag_srst_asserted(int* srst_asserted);
/* JTAG support functions */
-/* execute jtag queue and check value and use mask if mask is != NULL. invokes
- * jtag_set_error() with any error. */
+/**
+ * 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.
+ */
extern void jtag_check_value_mask(scan_field_t *field, u8 *value, u8 *mask);
#ifdef INCLUDE_JTAG_INTERFACE_H
extern enum scan_type jtag_scan_type(const scan_command_t* cmd);
-extern int jtag_scan_size(const scan_command_t* cmd);
-extern int jtag_read_buffer(u8* buffer, const scan_command_t* cmd);
-extern int jtag_build_buffer(const scan_command_t* cmd, u8** buffer);
+extern int jtag_scan_size(const scan_command_t* cmd);
+extern int jtag_read_buffer(u8* buffer, const scan_command_t* cmd);
+extern int jtag_build_buffer(const scan_command_t* cmd, u8** buffer);
#endif // INCLUDE_JTAG_INTERFACE_H
-extern void jtag_sleep(u32 us);
-extern int jtag_call_event_callbacks(enum jtag_event event);
-extern int jtag_register_event_callback(int (* callback)(enum jtag_event event, void* priv), void* priv);
+extern void jtag_sleep(u32 us);
+extern int jtag_call_event_callbacks(enum jtag_event event);
+extern int jtag_register_event_callback(int (* callback)(enum jtag_event event, void* priv), void* priv);
extern int jtag_verify_capture_ir;
void jtag_tap_handle_event(jtag_tap_t* tap, enum jtag_tap_event e);
-/* error codes
- * JTAG subsystem uses codes between -100 and -199 */
-
+/*
+ * 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_NOT_STABLE_STATE (-105)
#define ERROR_JTAG_DEVICE_ERROR (-107)
-/* jtag_add_dr_out() is a version of jtag_add_dr_scan() which
+/**
+ * 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.
* 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.
+ * 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
/**
- * Function jtag_add_statemove
- * moves from the current state to the goal \a state. This needs
- * to be handled according to the xsvf spec, see the XSTATE command
- * description.
+ * jtag_add_statemove() moves from the current state to @a goal_state.
+ *
+ * This function was originally designed to handle the XSTATE command
+ * from the XSVF specification.
+ *
+ * @param goal_state The final TAP state.
+ * @return ERROR_OK on success, or an error code on failure.
*/
extern int jtag_add_statemove(tap_state_t goal_state);
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