diff options
author | David Brownell <dbrownell@users.sourceforge.net> | 2010-02-27 00:12:38 -0800 |
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committer | David Brownell <dbrownell@users.sourceforge.net> | 2010-02-27 00:12:38 -0800 |
commit | a3245bd7cdd2d8c3740c5e8f31efcd78de67837a (patch) | |
tree | 37448ab9163c86ea221c821b956be11ebd06ebe8 /src/jtag/drivers | |
parent | 4a64820f230a267b1f2e36d4be567074e5b8cb76 (diff) |
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 <dbrownell@users.sourceforge.net>
Diffstat (limited to 'src/jtag/drivers')
-rw-r--r-- | src/jtag/drivers/driver.c | 25 |
1 files changed, 25 insertions, 0 deletions
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 */ |