From a3245bd7cdd2d8c3740c5e8f31efcd78de67837a Mon Sep 17 00:00:00 2001 From: David Brownell Date: Sat, 27 Feb 2010 00:12:38 -0800 Subject: interface: define TMS sequence command For support of SWD we need to be able to clock out special bit sequences over TMS or SWDIO. Create this as a generic operation, not yet called by anything, which is split as usual into: - upper level abstraction ... here, jtag_add_tms_seq(); - midlayer implementation logic hooking that to the lowlevel code; - lowlevel minidriver operation ... here, interface_add_tms_seq(); - message type for request queue, here JTAG_TMS. This is done slightly differently than other operations: there's a flag saying whether the interface driver supports this request. (In fact a flag *word* so upper layers can learn about other capabilities too ... for example, supporting SWD operations.) That approach (flag) lets this method *eventually* be used to eliminate pathmove() and statemove() support from most adapter drivers, by moving all that logic into the mid-layer and increasing uniformity between the various drivers. (Which will in turn reduce subtle bugginess.) Signed-off-by: David Brownell --- src/jtag/jtag.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'src/jtag/jtag.h') diff --git a/src/jtag/jtag.h b/src/jtag/jtag.h index 05557540..7e5dc102 100644 --- a/src/jtag/jtag.h +++ b/src/jtag/jtag.h @@ -575,6 +575,8 @@ tap_state_t jtag_get_end_state(void); void jtag_add_sleep(uint32_t us); +int jtag_add_tms_seq(unsigned nbits, const uint8_t *seq, enum tap_state t); + /** * Function jtag_add_clocks * first checks that the state in which the clocks are to be issued is @@ -693,7 +695,7 @@ 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., + * unsafe while nTRST is active or the JTAG clock is gated off. */ bool is_jtag_poll_safe(void); -- cgit v1.2.3