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Diffstat (limited to 'src/jtag/ft2232.c')
-rw-r--r--src/jtag/ft2232.c110
1 files changed, 100 insertions, 10 deletions
diff --git a/src/jtag/ft2232.c b/src/jtag/ft2232.c
index ad5e6378..c6125025 100644
--- a/src/jtag/ft2232.c
+++ b/src/jtag/ft2232.c
@@ -76,6 +76,18 @@ int ft2232_handle_layout_command(struct command_context_s *cmd_ctx, char *cmd, c
int ft2232_handle_vid_pid_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
int ft2232_handle_latency_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
+
+/**
+ * Function ft2232_stableclocks
+ * will send out \a num_cycles on the TCK line while the TAP(s)
+ * are in a stable state. Calling code must ensure that current state is
+ * stable, that verification is not done in here.
+ * @param num_cycles is the count of clocks cycles to send.
+ * @return int - ERROR_OK or ERROR_JTAG_QUEUE_FAILED
+ */
+static int ft2232_stableclocks(int num_cycles, jtag_command_t *cmd);
+
+
char *ft2232_device_desc = NULL;
char *ft2232_serial = NULL;
char *ft2232_layout = NULL;
@@ -149,10 +161,15 @@ static FT_HANDLE ftdih = NULL;
static struct ftdi_context ftdic;
#endif
+
+static jtag_command_t *first_unsent; /* next command that has to be sent */
+static int require_send;
+
static u8 *ft2232_buffer = NULL;
static int ft2232_buffer_size = 0;
static int ft2232_read_pointer = 0;
static int ft2232_expect_read = 0;
+
#define FT2232_BUFFER_SIZE 131072
#define BUFFER_ADD ft2232_buffer[ft2232_buffer_size++]
#define BUFFER_READ ft2232_buffer[ft2232_read_pointer++]
@@ -344,7 +361,7 @@ void ft2232_end_state(enum tap_state state)
void ft2232_read_scan(enum scan_type type, u8* buffer, int scan_size)
{
- int num_bytes = ((scan_size + 7) / 8);
+ int num_bytes = (scan_size + 7) / 8;
int bits_left = scan_size;
int cur_byte = 0;
@@ -903,14 +920,14 @@ int ft2232_predict_scan_out(int scan_size, enum scan_type type)
if (type == SCAN_IN) /* only from device to host */
{
/* complete bytes */
- predicted_size += (CEIL(num_bytes, 65536)) * 3;
+ predicted_size += CEIL(num_bytes, 65536) * 3;
/* remaining bits - 1 (up to 7) */
predicted_size += ((scan_size - 1) % 8) ? 2 : 0;
}
else /* host to device, or bidirectional */
{
/* complete bytes */
- predicted_size += num_bytes + (CEIL(num_bytes, 65536)) * 3;
+ predicted_size += num_bytes + CEIL(num_bytes, 65536) * 3;
/* remaining bits -1 (up to 7) */
predicted_size += ((scan_size - 1) % 8) ? 3 : 0;
}
@@ -1185,15 +1202,16 @@ void stm32stick_reset(int trst, int srst)
int ft2232_execute_queue()
{
jtag_command_t *cmd = jtag_command_queue; /* currently processed command */
- jtag_command_t *first_unsent = cmd; /* next command that has to be sent */
u8 *buffer;
int scan_size; /* size of IR or DR scan */
enum scan_type type;
int i;
int predicted_size = 0;
- int require_send = 0;
int retval;
+ first_unsent = cmd; /* next command that has to be sent */
+ require_send = 0;
+
/* return ERROR_OK, unless ft2232_send_and_recv reports a failed check
* that wasn't handled by a caller-provided error handler
*/
@@ -1214,6 +1232,7 @@ int ft2232_execute_queue()
if (cmd->cmd.end_state->end_state != -1)
ft2232_end_state(cmd->cmd.end_state->end_state);
break;
+
case JTAG_RESET:
/* only send the maximum buffer size that FT2232C can handle */
predicted_size = 3;
@@ -1236,6 +1255,7 @@ int ft2232_execute_queue()
LOG_DEBUG("trst: %i, srst: %i", cmd->cmd.reset->trst, cmd->cmd.reset->srst);
#endif
break;
+
case JTAG_RUNTEST:
/* only send the maximum buffer size that FT2232C can handle */
predicted_size = 0;
@@ -1292,9 +1312,10 @@ int ft2232_execute_queue()
}
require_send = 1;
#ifdef _DEBUG_JTAG_IO_
- LOG_DEBUG("runtest: %i, end in %i", cmd->cmd.runtest->num_cycles, end_state);
+ LOG_DEBUG("runtest: %i, end in %s", cmd->cmd.runtest->num_cycles, jtag_state_name(end_state));
#endif
break;
+
case JTAG_STATEMOVE:
/* only send the maximum buffer size that FT2232C can handle */
predicted_size = 3;
@@ -1317,9 +1338,10 @@ int ft2232_execute_queue()
cur_state = end_state;
require_send = 1;
#ifdef _DEBUG_JTAG_IO_
- LOG_DEBUG("statemove: %i", end_state);
+ LOG_DEBUG("statemove: %s", jtag_state_name(end_state));
#endif
break;
+
case JTAG_PATHMOVE:
/* only send the maximum buffer size that FT2232C can handle */
predicted_size = 3 * CEIL(cmd->cmd.pathmove->num_states, 7);
@@ -1333,9 +1355,11 @@ int ft2232_execute_queue()
ft2232_add_pathmove(cmd->cmd.pathmove);
require_send = 1;
#ifdef _DEBUG_JTAG_IO_
- LOG_DEBUG("pathmove: %i states, end in %i", cmd->cmd.pathmove->num_states, cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]);
+ LOG_DEBUG("pathmove: %i states, end in %s", cmd->cmd.pathmove->num_states,
+ jtag_state_name(cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]));
#endif
break;
+
case JTAG_SCAN:
scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
type = jtag_scan_type(cmd->cmd.scan);
@@ -1375,18 +1399,45 @@ int ft2232_execute_queue()
if (buffer)
free(buffer);
#ifdef _DEBUG_JTAG_IO_
- LOG_DEBUG("%s scan, %i bit, end in %i", (cmd->cmd.scan->ir_scan) ? "IR" : "DR", scan_size, end_state);
+ LOG_DEBUG("%s scan, %i bits, end in %s", (cmd->cmd.scan->ir_scan) ? "IR" : "DR", scan_size,
+ jtag_state_name(end_state));
#endif
break;
+
case JTAG_SLEEP:
if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
retval = ERROR_JTAG_QUEUE_FAILED;
first_unsent = cmd->next;
jtag_sleep(cmd->cmd.sleep->us);
#ifdef _DEBUG_JTAG_IO_
- LOG_DEBUG("sleep %i usec", cmd->cmd.sleep->us);
+ LOG_DEBUG("sleep %i usec while in %s", cmd->cmd.sleep->us, jtag_state_name(cur_state));
+#endif
+ break;
+
+ case JTAG_STABLECLOCKS:
+ /* "if (tap_move_map[cur_state] != -1)" is of no help when cur_state==TAP_IDLE */
+ switch(cur_state)
+ {
+ case TAP_DRSHIFT:
+ case TAP_IDLE:
+ case TAP_RESET:
+ case TAP_DRPAUSE:
+ case TAP_IRSHIFT:
+ case TAP_IRPAUSE:
+ break; /* above stable states are OK */
+ default:
+ LOG_ERROR( "jtag_add_clocks() was called with TAP in non-stable state \"%s\"",
+ jtag_state_name(cur_state) );
+ retval = ERROR_JTAG_QUEUE_FAILED;
+ }
+
+ if (ft2232_stableclocks(cmd->cmd.stableclocks->num_cycles, cmd) != ERROR_OK)
+ retval = ERROR_JTAG_QUEUE_FAILED;
+#ifdef _DEBUG_JTAG_IO_
+ LOG_DEBUG("clocks %i while in %s", cmd->cmd.stableclocks->num_cycles, jtag_state_name(cur_state));
#endif
break;
+
default:
LOG_ERROR("BUG: unknown JTAG command type encountered");
exit(-1);
@@ -2279,3 +2330,42 @@ int ft2232_handle_latency_command(struct command_context_s *cmd_ctx, char *cmd,
return ERROR_OK;
}
+
+
+static int ft2232_stableclocks(int num_cycles, jtag_command_t *cmd)
+{
+ int retval = 0;
+
+ while (num_cycles > 0)
+ {
+ /* the command 0x4b, "Clock Data to TMS/CS Pin (no Read)" handles
+ * at most 7 bits per invocation. Here we invoke it potentially
+ * several times.
+ */
+ int bitcount_per_command = (num_cycles > 7) ? 7 : num_cycles;
+
+ if (ft2232_buffer_size + 3 >= FT2232_BUFFER_SIZE)
+ {
+ if (ft2232_send_and_recv(first_unsent, cmd) != ERROR_OK)
+ retval = ERROR_JTAG_QUEUE_FAILED;
+
+ first_unsent = cmd;
+ }
+
+ /* command "Clock Data to TMS/CS Pin (no Read)" */
+ BUFFER_ADD = 0x4b;
+
+ /* scan 7 bit */
+ BUFFER_ADD = bitcount_per_command - 1;
+
+ /* TMS data bits are all zeros to stay in the current stable state */
+ BUFFER_ADD = 0x0;
+
+ require_send = 1;
+
+ num_cycles -= bitcount_per_command;
+ }
+
+ return retval;
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-03 00:42:50 +0000