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/drivers/driver.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'src/jtag/drivers') diff --git a/src/jtag/drivers/driver.c b/src/jtag/drivers/driver.c index 45c5d10a..14efe965 100644 --- a/src/jtag/drivers/driver.c +++ b/src/jtag/drivers/driver.c @@ -388,6 +388,31 @@ int interface_jtag_add_tlr(void) return ERROR_OK; } +int interface_add_tms_seq(unsigned num_bits, const uint8_t *seq) +{ + struct jtag_command *cmd; + + cmd = cmd_queue_alloc(sizeof(struct jtag_command)); + if (cmd == NULL) + return ERROR_FAIL; + + cmd->type = JTAG_TMS; + cmd->cmd.tms = cmd_queue_alloc(sizeof(*cmd->cmd.tms)); + if (!cmd->cmd.tms) + return ERROR_FAIL; + + /* copy the bits; our caller doesn't guarantee they'll persist */ + cmd->cmd.tms->num_bits = num_bits; + cmd->cmd.tms->bits = buf_cpy(seq, + cmd_queue_alloc(DIV_ROUND_UP(num_bits, 8)), num_bits); + if (!cmd->cmd.tms->bits) + return ERROR_FAIL; + + jtag_queue_command(cmd); + + return ERROR_OK; +} + int interface_jtag_add_pathmove(int num_states, const tap_state_t *path) { /* allocate memory for a new list member */ -- cgit v1.2.3