adiv5: introduce optional dap_sync() function

dap_sync() executes all commands in the JTAG queue and then checks
if a WAIT condition happened inside the last batch. If yes, a recovery
is invoked. If not, processing continues without checking for
errors. This function should be called in long AP read or writes, e.g.
while uploading a new application binary, at intermediate points within
the transfer where the cost of flushing the JTAG queue and checking the
journal doesn't affect performance too much.

Change-Id: I99eeaf47cdf951e15e589a04e74b90b5ce911386
Signed-off-by: Matthias Welwarsky <matthias@welwarsky.de>
Reviewed-on: http://openocd.zylin.com/3181
Tested-by: jenkins
Reviewed-by: Paul Fertser <fercerpav@gmail.com>

src/target/adi_v5_jtag.c

@@ -679,6 +679,11 @@ static int jtag_dp_run(struct adiv5_dap *dap)
 	return (retval2 != ERROR_OK) ? retval2 : retval;
 }
 
+static int jtag_dp_sync(struct adiv5_dap *dap)
+{
+	return jtagdp_overrun_check(dap);
+}
+
 /* FIXME don't export ... just initialize as
  * part of DAP setup
 */
@@ -689,6 +694,7 @@ const struct dap_ops jtag_dp_ops = {
 	.queue_ap_write      = jtag_ap_q_write,
 	.queue_ap_abort      = jtag_ap_q_abort,
 	.run                 = jtag_dp_run,
+	.sync                = jtag_dp_sync,
 };
 
 

src/target/arm_adi_v5.h

@@ -274,6 +274,10 @@ struct dap_ops {
 
 	/** Executes all queued DAP operations. */
 	int (*run)(struct adiv5_dap *dap);
+
+	/** Executes all queued DAP operations but doesn't check
+	 * sticky error conditions */
+	int (*sync)(struct adiv5_dap *dap);
 };
 
 /*
@@ -397,6 +401,14 @@ static inline int dap_run(struct adiv5_dap *dap)
 	return dap->ops->run(dap);
 }
 
+static inline int dap_sync(struct adiv5_dap *dap)
+{
+	assert(dap->ops != NULL);
+	if (dap->ops->sync)
+		return dap->ops->sync(dap);
+	return ERROR_OK;
+}
+
 static inline int dap_dp_read_atomic(struct adiv5_dap *dap, unsigned reg,
 				     uint32_t *value)
 {