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zy1000: reset bugfix 

flush JTAG FIFO before reset. Fixes RCLK problems observed
w/lpc2148, but really fixes a wider range of problems.

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
This commit is contained in:
Øyvind Harboe 2010-01-11 10:21:56 +01:00
parent 8c730aaee2
commit c74ca40e09
1 changed files with 7 additions and 1 deletions
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8
src/jtag/zy1000/zy1000.c
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@ -132,6 +132,13 @@ static int zy1000_power_dropout(int *dropout)
void zy1000_reset(int trst, int srst) void zy1000_reset(int trst, int srst)
{ {
LOG_DEBUG("zy1000 trst=%d, srst=%d", trst, srst); LOG_DEBUG("zy1000 trst=%d, srst=%d", trst, srst);
/* flush the JTAG FIFO. Not flushing the queue before messing with
* reset has such interesting bugs as causing hard to reproduce
* RCLK bugs as RCLK will stop responding when TRST is asserted
*/
waitIdle();
if (!srst) if (!srst)
{ {
ZY1000_POKE(ZY1000_JTAG_BASE + 0x14, 0x00000001); ZY1000_POKE(ZY1000_JTAG_BASE + 0x14, 0x00000001);
@ -156,7 +163,6 @@ void zy1000_reset(int trst, int srst)
if (trst||(srst && (jtag_get_reset_config() & RESET_SRST_PULLS_TRST))) if (trst||(srst && (jtag_get_reset_config() & RESET_SRST_PULLS_TRST)))
{ {
waitIdle();
/* we're now in the RESET state until trst is deasserted */ /* we're now in the RESET state until trst is deasserted */
ZY1000_POKE(ZY1000_JTAG_BASE + 0x20, TAP_RESET); ZY1000_POKE(ZY1000_JTAG_BASE + 0x20, TAP_RESET);
} else } else