arm11: allow minidrivers to implement inner loop of memory writes

This allows minidrivers to e.g. hardware accelerate memory
writes.

Same trick as is used for arm7/9 dcc writes.

Added error propagation for memory transfer failures in
code rearrangement.

Also the JTAG end state is not updated until after
the memory write run is complete.

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>

1 files changed, 92 insertions, 45 deletions

diff --git a/src/target/arm11_dbgtap.c b/src/target/arm11_dbgtap.c
index 6d132a79..b8388c82 100644
--- a/src/target/arm11_dbgtap.c
+++ b/src/target/arm11_dbgtap.c
@@ -569,43 +569,31 @@ static const tap_state_t arm11_MOVE_DRPAUSE_IDLE_DRPAUSE_with_delay[] =
 	TAP_DREXIT2, TAP_DRUPDATE, TAP_IDLE, TAP_IDLE, TAP_IDLE, TAP_DRSELECT, TAP_DRCAPTURE, TAP_DRSHIFT
 };
 
-
-
-/** Execute one instruction via ITR repeatedly while
- *  passing data to the core via DTR on each execution.
- *
- * Caller guarantees that processor is in debug state, that DSCR_ITR_EN
- * is set, the ITR Ready flag is set (as seen on the previous entry to
- * TAP_DRCAPTURE), and the DSCR sticky abort flag is clear.
- *
- *  No Ready check during transmission.
- *
- *  The executed instruction \em must read data from DTR.
- *
- * \pre arm11_run_instr_data_prepare() /  arm11_run_instr_data_finish() block
- *
- * \param arm11		Target state variable.
- * \param opcode	ARM opcode
- * \param data		Pointer to the data words to be passed to the core
- * \param count		Number of data words and instruction repetitions
- *
+/* This inner loop can be implemented by the minidriver, oftentimes in hardware... The
+ * minidriver can call the default implementation as a fallback or implement it
+ * from scratch.
  */
-int arm11_run_instr_data_to_core_noack(struct arm11_common * arm11, uint32_t opcode, uint32_t * data, size_t count)
+int arm11_run_instr_data_to_core_noack_inner_default(struct jtag_tap * tap, uint32_t opcode, uint32_t * data, size_t count)
 {
-	arm11_add_IR(arm11, ARM11_ITRSEL, ARM11_TAP_DEFAULT);
+	struct scan_field	chain5_fields[3];
 
-	arm11_add_debug_INST(arm11, opcode, NULL, TAP_DRPAUSE);
+	chain5_fields[0].tap			= tap;
+	chain5_fields[0].num_bits		= 32;
+	chain5_fields[0].out_value		= NULL; /*&Data*/
+	chain5_fields[0].in_value		= NULL;
 
-	arm11_add_IR(arm11, ARM11_EXTEST, ARM11_TAP_DEFAULT);
+	chain5_fields[1].tap			= tap;
+	chain5_fields[1].num_bits		= 1;
+	chain5_fields[1].out_value		= NULL;
+	chain5_fields[1].in_value		= NULL; /*&Ready*/
 
-	struct scan_field	chain5_fields[3];
-
-	arm11_setup_field(arm11, 32,    NULL/*&Data*/,  NULL,				chain5_fields + 0);
-	arm11_setup_field(arm11,  1,    NULL,			NULL /*&Ready*/,	chain5_fields + 1);
-	arm11_setup_field(arm11,  1,    NULL,			NULL,				chain5_fields + 2);
+	chain5_fields[2].tap			= tap;
+	chain5_fields[2].num_bits		= 1;
+	chain5_fields[2].out_value		= NULL;
+	chain5_fields[2].in_value		= NULL;
 
 	uint8_t			*Readies;
-	unsigned readiesNum = count + 1;
+	unsigned readiesNum = count;
 	unsigned bytes = sizeof(*Readies)*readiesNum;
 
 	Readies = (uint8_t *) malloc(bytes);
@@ -616,31 +604,22 @@ int arm11_run_instr_data_to_core_noack(struct arm11_common * arm11, uint32_t opc
 	}
 
 	uint8_t	*		ReadyPos			= Readies;
-
 	while (count--)
 	{
 		chain5_fields[0].out_value	= (void *)(data++);
 		chain5_fields[1].in_value	= ReadyPos++;
 
-		if (count)
+		if (count > 0)
 		{
-			jtag_add_dr_scan(ARRAY_SIZE(chain5_fields), chain5_fields, jtag_set_end_state(TAP_DRPAUSE));
+			jtag_add_dr_scan(ARRAY_SIZE(chain5_fields), chain5_fields, TAP_DRPAUSE);
 			jtag_add_pathmove(ARRAY_SIZE(arm11_MOVE_DRPAUSE_IDLE_DRPAUSE_with_delay),
 				arm11_MOVE_DRPAUSE_IDLE_DRPAUSE_with_delay);
-		}
-		else
+		} else
 		{
-			jtag_add_dr_scan(ARRAY_SIZE(chain5_fields), chain5_fields, jtag_set_end_state(TAP_IDLE));
+			jtag_add_dr_scan(ARRAY_SIZE(chain5_fields), chain5_fields, TAP_IDLE);
 		}
 	}
 
-	arm11_add_IR(arm11, ARM11_INTEST, ARM11_TAP_DEFAULT);
-
-	chain5_fields[0].out_value	= 0;
-	chain5_fields[1].in_value   = ReadyPos++;
-
-	arm11_add_dr_scan_vc(ARRAY_SIZE(chain5_fields), chain5_fields, TAP_DRPAUSE);
-
 	int retval = jtag_execute_queue();
 	if (retval == ERROR_OK)
 	{
@@ -655,16 +634,84 @@ int arm11_run_instr_data_to_core_noack(struct arm11_common * arm11, uint32_t opc
 		}
 
 		if (error_count > 0 )
+		{
 			LOG_ERROR("%u words out of %u not transferred",
 				error_count, readiesNum);
-
+			retval = ERROR_FAIL;
+		}
 	}
-
 	free(Readies);
 
 	return retval;
 }
 
+int arm11_run_instr_data_to_core_noack_inner(struct jtag_tap * tap, uint32_t opcode, uint32_t * data, size_t count);
+
+#ifndef HAVE_JTAG_MINIDRIVER_H
+int arm11_run_instr_data_to_core_noack_inner(struct jtag_tap * tap, uint32_t opcode, uint32_t * data, size_t count)
+{
+	return arm11_run_instr_data_to_core_noack_inner_default(tap, opcode, data, count);
+}
+#endif
+
+/** Execute one instruction via ITR repeatedly while
+ *  passing data to the core via DTR on each execution.
+ *
+ * Caller guarantees that processor is in debug state, that DSCR_ITR_EN
+ * is set, the ITR Ready flag is set (as seen on the previous entry to
+ * TAP_DRCAPTURE), and the DSCR sticky abort flag is clear.
+ *
+ *  No Ready check during transmission.
+ *
+ *  The executed instruction \em must read data from DTR.
+ *
+ * \pre arm11_run_instr_data_prepare() /  arm11_run_instr_data_finish() block
+ *
+ * \param arm11		Target state variable.
+ * \param opcode	ARM opcode
+ * \param data		Pointer to the data words to be passed to the core
+ * \param count		Number of data words and instruction repetitions
+ *
+ */
+int arm11_run_instr_data_to_core_noack(struct arm11_common * arm11, uint32_t opcode, uint32_t * data, size_t count)
+{
+	arm11_add_IR(arm11, ARM11_ITRSEL, ARM11_TAP_DEFAULT);
+
+	arm11_add_debug_INST(arm11, opcode, NULL, TAP_DRPAUSE);
+
+	arm11_add_IR(arm11, ARM11_EXTEST, ARM11_TAP_DEFAULT);
+
+	int retval = arm11_run_instr_data_to_core_noack_inner(arm11->arm.target->tap, opcode, data, count);
+
+	if (retval != ERROR_FAIL)
+		return retval;
+
+	arm11_add_IR(arm11, ARM11_INTEST, ARM11_TAP_DEFAULT);
+
+	struct scan_field	chain5_fields[3];
+
+	arm11_setup_field(arm11, 32,    NULL/*&Data*/,  NULL,				chain5_fields + 0);
+	arm11_setup_field(arm11,  1,    NULL,			NULL /*&Ready*/,	chain5_fields + 1);
+	arm11_setup_field(arm11,  1,    NULL,			NULL,				chain5_fields + 2);
+
+	uint8_t ready_flag;
+	chain5_fields[1].in_value   = &ready_flag;
+
+	arm11_add_dr_scan_vc(ARRAY_SIZE(chain5_fields), chain5_fields, TAP_DRPAUSE);
+
+	retval = jtag_execute_queue();
+	if (retval == ERROR_OK)
+	{
+		if (ready_flag != 1)
+		{
+			LOG_ERROR("last word not transferred");
+			retval = ERROR_FAIL;
+		}
+	}
+
+	return retval;
+}
+
 
 /** Execute an instruction via ITR while handing data into the core via DTR.
  *