* 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 *
#include "types.h"
#include "binarybuffer.h"
+#include "log.h"
#include "command.h"
#define _DEBUG_JTAG_IO_
#endif
-/* Tap States
- * TLR - Test-Logic-Reset, RTI - Run-Test/Idle,
- * SDS - Select-DR-Scan, CD - Capture-DR, SD - Shift-DR, E1D - Exit1-DR,
- * PD - Pause-DR, E2D - Exit2-DR, UD - Update-DR,
- * SIS - Select-IR-Scan, CI - Capture-IR, SI - Shift-IR, E1I - Exit1-IR,
- * PI - Pause-IR, E2I - Exit2-IR, UI - Update-IR
+/* 16 Tap States, from page 21 of ASSET InterTech, Inc.'s svf.pdf
*/
enum tap_state
{
- TAP_TLR = 0x0, TAP_RTI = 0x8,
- TAP_SDS = 0x1, TAP_CD = 0x2, TAP_SD = 0x3, TAP_E1D = 0x4,
- TAP_PD = 0x5, TAP_E2D = 0x6, TAP_UD = 0x7,
- TAP_SIS = 0x9, TAP_CI = 0xa, TAP_SI = 0xb, TAP_E1I = 0xc,
- TAP_PI = 0xd, TAP_E2I = 0xe, TAP_UI = 0xf
+ TAP_RESET = 0x0, TAP_IDLE = 0x8,
+ TAP_DRSELECT = 0x1, TAP_DRCAPTURE = 0x2, TAP_DRSHIFT = 0x3, TAP_DREXIT1 = 0x4,
+ TAP_DRPAUSE = 0x5, TAP_DREXIT2 = 0x6, TAP_DRUPDATE = 0x7,
+ TAP_IRSELECT = 0x9, TAP_IRCAPTURE = 0xa, TAP_IRSHIFT = 0xb, TAP_IREXIT1 = 0xc,
+ TAP_IRPAUSE = 0xd, TAP_IREXIT2 = 0xe, TAP_IRUPDATE = 0xf
};
typedef struct tap_transition_s
typedef struct scan_field_s
{
- int device; /* ordinal device number this instruction refers to */
+ 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 *out_mask; /* only masked bits care */
u8 *in_value; /* pointer to a 32-bit memory location to take data scanned out */
/* in_check_value/mask, in_handler_error_handler, in_handler_priv can be used by the in handler, otherwise they contain garbage */
- u8 *in_check_value; /* used to validate scan results */
- u8 *in_check_mask; /* check specified bits against check_value */
+ u8 *in_check_value; /* used to validate scan results */
+ u8 *in_check_mask; /* check specified bits against check_value */
in_handler_t in_handler; /* process received buffer using this handler */
void *in_handler_priv; /* additional information for the in_handler */
} scan_field_t;
+
enum scan_type
{
/* IN: from device to host, OUT: from host to device */
extern jtag_command_t *jtag_command_queue;
-typedef struct jtag_device_s
+// this is really: typedef jtag_tap_t
+// But - the typedef is done in "types.h"
+// due to "forward decloration reasons"
+struct jtag_tap_s
{
+ 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 */
- struct jtag_device_s *next;
-} jtag_device_t;
+ jtag_tap_t *next_tap;
+};
+extern jtag_tap_t *jtag_AllTaps(void);
+extern jtag_tap_t *jtag_TapByPosition(int n);
+extern jtag_tap_t *jtag_TapByPosition( int n );
+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);
+
+
+static __inline__ jtag_tap_t *
+jtag_NextEnabledTap( jtag_tap_t *p )
+{
+ if( p == NULL ){
+ // start at the head of list
+ p = jtag_AllTaps();
+ } else {
+ // start *after* this one
+ p = p->next_tap;
+ }
+ while( p ){
+ if( p->enabled ){
+ break;
+ } else {
+ p = p->next_tap;
+ }
+ }
+ return p;
+}
+
+
-extern jtag_device_t *jtag_devices;
-extern int jtag_num_devices;
-extern int jtag_ir_scan_size;
enum reset_line_mode
{
typedef struct jtag_interface_s
{
char* name;
-
+
/* queued command execution
*/
int (*execute_queue)(void);
-
+
/* interface initalization
*/
int (*speed)(int speed);
int (*register_commands)(struct command_context_s *cmd_ctx);
int (*init)(void);
int (*quit)(void);
-
+ /* returns JTAG maxium speed for KHz. 0=RTCK. The function returns
+ a failure if it can't support the KHz/RTCK.
+
+ WARNING!!!! if RTCK is *slow* then think carefully about
+ whether you actually want to support this in the driver.
+ Many target scripts are written to handle the absence of RTCK
+ and use a fallback kHz TCK.
+ */
+ int (*khz)(int khz, int *jtag_speed);
+ /* returns the KHz for the provided JTAG speed. 0=RTCK. The function returns
+ a failure if it can't support the KHz/RTCK. */
+ int (*speed_div)(int speed, int *khz);
+
+ /* Read and clear the power dropout flag. Note that a power dropout
+ can be transitionary, easily much less than a ms.
+
+ So to find out if the power is *currently* on, you must invoke
+ this method twice. Once to clear the power dropout flag and a
+ second time to read the current state.
+
+ Currently the default implementation is never to detect power dropout.
+ */
+ int (*power_dropout)(int *power_dropout);
+ /* Read and clear the srst asserted detection flag.
+ *
+ * NB!!!! like power_dropout this does *not* read the current
+ * state. srst assertion is transitionary and *can* be much
+ * less than 1ms.
+ */
+ int (*srst_asserted)(int *srst_asserted);
+
} jtag_interface_t;
enum jtag_event
{
- JTAG_SRST_ASSERTED,
- JTAG_TRST_ASSERTED,
- JTAG_SRST_RELEASED,
- JTAG_TRST_RELEASED,
+ JTAG_TRST_ASSERTED
};
extern char* jtag_event_strings[];
extern enum tap_state end_state;
extern enum tap_state cur_state;
-extern char* jtag_interface;
extern int jtag_speed;
+extern int jtag_speed_post_reset;
enum reset_types
{
- RESET_NONE = 0x0,
- RESET_HAS_TRST = 0x1,
- RESET_HAS_SRST = 0x2,
- RESET_TRST_AND_SRST = 0x3,
+ 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,
extern enum reset_types jtag_reset_config;
-/* JTAG subsystem */
+/* initialize interface upon startup. A successful no-op
+ * upon subsequent invocations
+ */
+extern int jtag_interface_init(struct command_context_s *cmd_ctx);
+/* initialize JTAG chain using only a TLR reset. If init fails,
+ * try reset + init.
+ */
extern int jtag_init(struct command_context_s *cmd_ctx);
+/* 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 */
-extern int jtag_add_ir_scan(int num_fields, scan_field_t *fields, enum tap_state endstate, void *dummy_anachronism);
-extern int jtag_add_dr_scan(int num_fields, scan_field_t *fields, enum tap_state endstate, void *dummy_anachronism);
-extern int jtag_add_plain_ir_scan(int num_fields, scan_field_t *fields, enum tap_state endstate, void *dummy_anachronism);
-extern int jtag_add_plain_dr_scan(int num_fields, scan_field_t *fields, enum tap_state endstate, void *dummy_anachronism);
-/* execute a state transition within the JTAG standard, but the exact path
- * path that is taken is undefined. Many implementations use precisely
- * 7 clocks to perform a transition, but it could be more or less
- * than that.
- *
- * The following assertions are made about certain common state moves:
+/* JTAG interface, can be implemented with a software or hardware fifo
*
- * - A state move from Pause-[ID]R to Pause-[ID]R should always go through
- * Update-[ID]R and Capture-[ID]R before returning to Pause-[ID]R, otherwise
- * there's no way force a register update, if you can't go to Run-Test/Idle for
- * some reason.
+ * TAP_DRSHIFT and TAP_IRSHIFT are illegal end states. TAP_DRSHIFT/SI as end states
+ * can be emulated by using a larger scan.
*
- * - A state move from Pause-[ID]R to Shift-[ID]R must not go through
- * Update-[ID]R.
+ * 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.
*
- * - Run-Test/Idle must not be entered unless requested, because R-T/I may have
- * side effects.
*/
-extern int jtag_add_statemove(enum tap_state endstate);
-/* A list of unambigious single clock state transitions, not
+extern void jtag_add_ir_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
+extern int interface_jtag_add_ir_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
+extern void jtag_add_dr_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
+extern int interface_jtag_add_dr_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
+extern void jtag_add_plain_ir_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
+extern int interface_jtag_add_plain_ir_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
+extern void jtag_add_plain_dr_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
+extern int interface_jtag_add_plain_dr_scan(int num_fields, scan_field_t *fields, enum tap_state endstate);
+/* run a TAP_RESET reset. End state is TAP_RESET, regardless
+ * of start state.
+ */
+extern void jtag_add_tlr(void);
+extern int interface_jtag_add_tlr(void);
+/* 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.
+ */
+extern void jtag_add_pathmove(int num_states, enum tap_state *path);
+extern int interface_jtag_add_pathmove(int num_states, enum tap_state *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
+ */
+extern void jtag_add_runtest(int num_cycles, enum tap_state endstate);
+extern int interface_jtag_add_runtest(int num_cycles, enum tap_state 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.
*/
-extern int jtag_add_pathmove(int num_states, enum tap_state *path);
-/* cycle precisely num_cycles in the TAP_RTI state */
-extern int jtag_add_runtest(int num_cycles, enum tap_state endstate);
-extern int jtag_add_reset(int trst, int srst);
-extern int jtag_add_end_state(enum tap_state endstate);
-extern int jtag_add_sleep(u32 us);
+extern void jtag_add_reset(int req_tlr_or_trst, int srst);
+/* this drives the actual srst and trst pins. srst will always be 0
+ * if jtag_reset_config & RESET_SRST_PULLS_TRST != 0 and ditto for
+ * trst.
+ *
+ * the higher level jtag_add_reset will invoke jtag_add_tlr() if
+ * approperiate
+ */
+extern int interface_jtag_add_reset(int trst, int srst);
+extern void jtag_add_end_state(enum tap_state endstate);
+extern int interface_jtag_add_end_state(enum tap_state endstate);
+extern void jtag_add_sleep(u32 us);
+extern int interface_jtag_add_sleep(u32 us);
+
+
+
/*
- * For software FIFO implementations, the queued commands can be executed
+ * 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()
+ *
+ * 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.
- *
+ * 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().
+ * 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().
*/
extern int jtag_execute_queue(void);
+/* can be implemented by hw+sw */
+extern int interface_jtag_execute_queue(void);
+extern int jtag_power_dropout(int *dropout);
+extern int jtag_srst_asserted(int *srst_asserted);
+
/* JTAG support functions */
extern void jtag_set_check_value(scan_field_t *field, u8 *value, u8 *mask, error_handler_t *in_error_handler);
extern int jtag_scan_size(scan_command_t *cmd);
extern int jtag_read_buffer(u8 *buffer, scan_command_t *cmd);
extern int jtag_build_buffer(scan_command_t *cmd, u8 **buffer);
-extern jtag_device_t* jtag_get_device(int num);
+
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;
-
/* error codes
* JTAG subsystem uses codes between -100 and -199 */
#define ERROR_JTAG_NOT_IMPLEMENTED (-102)
#define ERROR_JTAG_TRST_ASSERTED (-103)
#define ERROR_JTAG_QUEUE_FAILED (-104)
-#define ERROR_JTAG_RESET_WOULD_ASSERT_TRST (-105)
-#define ERROR_JTAG_RESET_CANT_SRST (-106)
#define ERROR_JTAG_DEVICE_ERROR (-107)
+
+
+
+/* this allows JTAG devices to implement the entire jtag_xxx() layer in hw/sw */
+#ifdef HAVE_JTAG_MINIDRIVER_H
+/* Here a #define MINIDRIVER() and an inline version of hw fifo interface_jtag_add_dr_out can be defined */
+#include "jtag_minidriver.h"
+#define MINIDRIVER(a) notused ## a
+#else
+#define MINIDRIVER(a) a
+/* jtag_add_dr_out() is a faster version of jtag_add_dr_scan()
+ *
+ * Current or end_state can not be TAP_RESET. end_state can be -1
+ *
+ * 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.
+ *
+ * Note that this jtag_add_dr_out can be defined as an inline function.
+ */
+extern void interface_jtag_add_dr_out(jtag_tap_t *tap,
+ int num_fields,
+ const int *num_bits,
+ const u32 *value,
+ enum tap_state end_state);
+#endif
+
+
+
+
+static __inline__ void jtag_add_dr_out(jtag_tap_t *tap,
+ int num_fields,
+ const int *num_bits,
+ const u32 *value,
+ enum tap_state end_state)
+{
+ if (end_state != -1)
+ cmd_queue_end_state=end_state;
+ cmd_queue_cur_state=cmd_queue_end_state;
+ interface_jtag_add_dr_out(tap, num_fields, num_bits, value, cmd_queue_end_state);
+}
+
+
#endif /* JTAG_H */
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