From 71fca29a26b61a2e38f352a788583b7d0a0de298 Mon Sep 17 00:00:00 2001
From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Tue, 10 Jul 2018 05:42:41 +0100
Subject: [PATCH] adding code in cut/paste style from bsv to get class
 structures ready for myhdl

---
 src/myhdl/pinmux_generator.py | 127 +++++++++++++++++++++++++++++++++-
 1 file changed, 126 insertions(+), 1 deletion(-)

diff --git a/src/myhdl/pinmux_generator.py b/src/myhdl/pinmux_generator.py
index a31f97d..0dfdef5 100644
--- a/src/myhdl/pinmux_generator.py
+++ b/src/myhdl/pinmux_generator.py
@@ -1,6 +1,131 @@
 from parse import Parse
+from ifacebase import InterfacesBase
+try:
+    from string import maketrans
+except ImportError:
+    maketrans = str.maketrans
+
+digits = maketrans('0123456789', ' ' * 10)  # delete space later
+
+# XXX hmmm duplicated from src/bsc/actual_pinmux.py
+def transfn(temp):
+    """ removes the number from the string of signal name.
+    """
+    temp = temp.split('_')
+    if len(temp) == 2:
+        temp[0] = temp[0].translate(digits)
+        temp[0] = temp[0] .replace(' ', '')
+    return '_'.join(temp)
+
+
+class Pin(object):
+    """ pin interface declaration.
+        * name is the name of the pin
+        * ready, enabled and io all create a (* .... *) prefix
+        * action changes it to an "in" if true
+    """
+
+    def __init__(self, name,
+                 ready=True,
+                 enabled=True,
+                 io=False,
+                 action=False,
+                 bitspec=None,
+                 outenmode=False):
+        self.name = name
+        self.ready = ready
+        self.enabled = enabled
+        self.io = io
+        self.action = action
+        self.bitspec = bitspec if bitspec else 'Bit#(1)'
+        self.outenmode = outenmode
+
+
+class Interface(object):
+    """ create an interface from a list of pinspecs.
+        each pinspec is a dictionary, see Pin class arguments
+        single indicates that there is only one of these, and
+        so the name must *not* be extended numerically (see pname)
+    """
+    # sample interface object:
+    """
+    twiinterface_decl = Interface('twi',
+                                  [{'name': 'sda', 'outen': True},
+                                   {'name': 'scl', 'outen': True},
+                                   ])
+    """
+
+    def __init__(self, ifacename, pinspecs, ganged=None, single=False):
+        self.ifacename = ifacename
+        self.ganged = ganged or {}
+        self.pins = []  # a list of instances of class Pin
+        self.pinspecs = pinspecs  # a list of dictionary
+        self.single = single
+        for p in pinspecs:
+            _p = {}
+            _p.update(p)
+            if p.get('outen') is True:  # special case, generate 3 pins
+                del _p['outen']
+                for psuffix in ['out', 'outen', 'in']:
+                    # changing the name (like sda) to (twi_sda_out)
+                    _p['name'] = "%s_%s" % (self.pname(p['name']), psuffix)
+                    _p['action'] = psuffix != 'in'
+                    self.pins.append(Pin(**_p))
+                    # will look like {'name': 'twi_sda_out', 'action': True}
+                    # {'name': 'twi_sda_outen', 'action': True}
+                    #{'name': 'twi_sda_in', 'action': False}
+                    # NOTice - outen key is removed
+            else:
+                _p['name'] = self.pname(p['name'])
+                self.pins.append(Pin(**_p))
+
+    def getifacetype(self, name):
+        for p in self.pinspecs:
+            fname = "%s_%s" % (self.ifacename, p['name'])
+            #print "search", self.ifacename, name, fname
+            if fname == name:
+                if p.get('action'):
+                    return 'out'
+                elif p.get('outen'):
+                    return 'inout'
+                return 'input'
+        return None
+
+    def pname(self, name):
+        """ generates the interface spec e.g. flexbus_ale
+            if there is only one flexbus interface, or
+            sd{0}_cmd if there are several.  string format
+            function turns this into sd0_cmd, sd1_cmd as
+            appropriate.  single mode stops the numerical extension.
+        """
+        if self.single:
+            return '%s_%s' % (self.ifacename, name)
+        return '%s{0}_%s' % (self.ifacename, name)
+
+
+
+class Interfaces(InterfacesBase):
+    """ contains a list of interface definitions
+    """
+
+    def __init__(self, pth=None):
+        InterfacesBase.__init__(self, Interface, pth)
+
+
+def init(p, ifaces):
+    for cell in p.muxed_cells:
+
+        for i in range(0, len(cell) - 1):
+            cname = cell[i + 1]
+            if not cname:  # skip blank entries, no need to test
+                continue
+            temp = transfn(cname)
+            x = ifaces.getifacetype(temp)
+            print (cname, temp, x)
+
 
 def pinmuxgen(pth=None, verify=True):
     p = Parse(pth, verify)
     print p, dir(p)
-
+    ifaces = Interfaces(pth)
+    init(p, ifaces)
-- 
2.30.2