jtag/drivers/ftdi: add option to declare signal aliases

This adds -alias|-nalias options to ftdi_layout_signal command that
allow to declare a new signal based on an already defined one.

Change-Id: I552578ebcd12ae21957a1c0d3b7e878adeff6df0
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Reviewed-on: http://openocd.zylin.com/2181
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>

diff --git a/doc/openocd.texi b/doc/openocd.texi
index fa8f1c550d7845970cac73ce581a9523fece13f0..e51de4de9108a01607e48faa8b6f5211c212eb00 100644 (file)
--- a/doc/openocd.texi
+++ b/doc/openocd.texi
@@ -2767,7 +2767,7 @@ minimal impact on the target system. Avoid floating inputs, conflicting outputs
 and initially asserted reset signals.
 @end deffn
 
-@deffn {Config Command} {ftdi_layout_signal} name [@option{-data}|@option{-ndata} data_mask] [@option{-oe}|@option{-noe} oe_mask]
+@deffn {Config Command} {ftdi_layout_signal} name [@option{-data}|@option{-ndata} data_mask] [@option{-oe}|@option{-noe} oe_mask] [@option{-alias}|@option{-nalias} name]
 Creates a signal with the specified @var{name}, controlled by one or more FTDI
 GPIO pins via a range of possible buffer connections. The masks are FTDI GPIO
 register bitmasks to tell the driver the connection and type of the output
@@ -2790,6 +2790,10 @@ target without any buffer. The FTDI pin is then switched between output and
 input as necessary to provide the full set of low, high and Hi-Z
 characteristics. In all other cases, the pins specified in a signal definition
 are always driven by the FTDI.
+
+If @option{-alias} or @option{-nalias} is used, the signal is created
+identical (or with data inverted) to an already specified signal
+@var{name}.
 @end deffn
 
 @deffn {Command} {ftdi_set_signal} name @option{0}|@option{1}|@option{z}

diff --git a/src/jtag/drivers/ftdi.c b/src/jtag/drivers/ftdi.c
index be02d20907e84f6e6dcf1e575c8b5f91544750bb..9d3444738930fb5065cdeddd2bbad935e1fdfddc 100644 (file)
--- a/src/jtag/drivers/ftdi.c
+++ b/src/jtag/drivers/ftdi.c
@@ -740,6 +740,19 @@ COMMAND_HANDLER(ftdi_handle_layout_signal_command)
                } else if (strcmp("-noe", CMD_ARGV[i]) == 0) {
                        invert_oe = true;
                        COMMAND_PARSE_NUMBER(u16, CMD_ARGV[i + 1], oe_mask);
+               } else if (!strcmp("-alias", CMD_ARGV[i]) ||
+                          !strcmp("-nalias", CMD_ARGV[i])) {
+                       if (!strcmp("-nalias", CMD_ARGV[i]))
+                               invert_data = true;
+                       struct signal *sig = find_signal_by_name(CMD_ARGV[i + 1]);
+                       if (!sig) {
+                               LOG_ERROR("signal %s is not defined", CMD_ARGV[i + 1]);
+                               return ERROR_FAIL;
+                       }
+                       data_mask = sig->data_mask;
+                       oe_mask = sig->oe_mask;
+                       invert_oe = sig->invert_oe;
+                       invert_data ^= sig->invert_data;
                } else {
                        LOG_ERROR("unknown option '%s'", CMD_ARGV[i]);
                        return ERROR_COMMAND_SYNTAX_ERROR;
@@ -869,7 +882,7 @@ static const struct command_registration ftdi_command_handlers[] = {
                .mode = COMMAND_ANY,
                .help = "define a signal controlled by one or more FTDI GPIO as data "
                        "and/or output enable",
-               .usage = "name [-data mask|-ndata mask] [-oe mask|-noe mask]",
+               .usage = "name [-data mask|-ndata mask] [-oe mask|-noe mask] [-alias|-nalias name]",
        },
        {
                .name = "ftdi_set_signal",