#include "types.h"
#include "binarybuffer.h"
+#include "log.h"
#include "command.h"
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 */
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. */
+ int (*khz)(int khz, int *jtag_speed);
} 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
{
extern int jtag_init(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 nothing is defined
- * w.r.t. the path that is taken. Many implementations use precisely
- * 7 clocks to perform a transition, but it could be more or less
- * than that.
- */\r
-extern int jtag_add_statemove(enum tap_state endstate);
-/* A list of unambigious single clock state transitions, not
+/* JTAG interface, can be implemented with a software or hardware fifo
+ *
+ * TAP_SD and TAP_SI are illegal end states. TAP_SD/SI as end states
+ * can be emulated by using a larger scan.
+ *
+ * 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.
+ *
+ */
+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_TLR reset. End state is TAP_TLR, regardless
+ * of start state.
+ */
+extern void jtag_add_tlr();
+extern int interface_jtag_add_tlr();
+/* 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_TLR 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_RTI, if we're not already there and cycle
+ * precisely num_cycles in the TAP_RTI after which move
+ * to the end state, if it is != TAP_RTI
+ */
+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.
+ *
*/
-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
* during this call or earlier. A sw queue might decide to push out
* 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);
/* 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_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_TLR. 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(int device,
+ int num_fields,
+ int *num_bits,
+ u32 *value,
+ enum tap_state end_state);
+#endif
+
+
+
+
+static __inline__ void jtag_add_dr_out(int device,
+ int num_fields,
+ int *num_bits,
+ 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(device, num_fields, num_bits, value, cmd_queue_end_state);
+}
+
+
#endif /* JTAG_H */
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