src/bsv/interface_decl.py

   1 import os.path
   2
   3 try:
   4     from UserDict import UserDict
   5 except ImportError:
   6     from collections import UserDict
   7
   8 from bsv.wire_def import generic_io  # special case
   9 from bsv.wire_def import muxwire  # special case
  10 from ifacebase import InterfacesBase
  11 from bsv.peripheral_gen import PFactory
  12 from bsv.peripheral_gen import axi_slave_declarations
  13 slowfactory = PFactory()
  14
  15
  16 class Pin(object):
  17     """ pin interface declaration.
  18         * name is the name of the pin
  19         * ready, enabled and io all create a (* .... *) prefix
  20         * action changes it to an "in" if true
  21     """
  22
  23     def __init__(self, name,
  24                  ready=True,
  25                  enabled=True,
  26                  io=False,
  27                  action=False,
  28                  bitspec=None,
  29                  outenmode=False):
  30         self.name = name
  31         self.ready = ready
  32         self.enabled = enabled
  33         self.io = io
  34         self.action = action
  35         self.bitspec = bitspec if bitspec else 'Bit#(1)'
  36         self.outenmode = outenmode
  37
  38     # bsv will look like this (method declaration):
  39     """
  40     (*always_ready,always_enabled*) method Bit#(1) io0_cell_outen;
  41     (*always_ready,always_enabled,result="io"*) method
  42                        Action io0_inputval (Bit#(1) in);
  43     """
  44
  45     def ifacefmt(self, fmtfn):
  46         res = '    '
  47         status = []
  48         if self.ready:
  49             status.append('always_ready')
  50         if self.enabled:
  51             status.append('always_enabled')
  52         if self.io:
  53             status.append('result="io"')
  54         if status:
  55             res += '(*'
  56             res += ','.join(status)
  57             res += '*)'
  58         res += " method "
  59         if self.io:
  60             res += "\n                      "
  61         name = fmtfn(self.name)
  62         if self.action:
  63             res += " Action "
  64             res += name
  65             res += ' (%s in)' % self.bitspec
  66         else:
  67             res += " %s " % self.bitspec
  68             res += name
  69         res += ";"
  70         return res
  71
  72     # sample bsv method definition :
  73     """
  74     method Action  cell0_mux(Bit#(2) in);
  75         wrcell0_mux<=in;
  76     endmethod
  77     """
  78
  79     def ifacedef(self, fmtoutfn, fmtinfn, fmtdecfn):
  80         res = '      method '
  81         if self.action:
  82             fmtname = fmtinfn(self.name)
  83             res += "Action  "
  84             res += fmtdecfn(self.name)
  85             res += '(%s in);\n' % self.bitspec
  86             res += '         %s<=in;\n' % fmtname
  87             res += '      endmethod'
  88         else:
  89             fmtname = fmtoutfn(self.name)
  90             res += "%s=%s;" % (self.name, fmtname)
  91         return res
  92     # sample bsv wire (wire definiton):
  93     """
  94     Wire#(Bit#(2)) wrcell0_mux<-mkDWire(0);
  95     """
  96
  97     def wirefmt(self, fmtoutfn, fmtinfn, fmtdecfn):
  98         res = '      Wire#(%s) ' % self.bitspec
  99         if self.action:
 100             res += '%s' % fmtinfn(self.name)
 101         else:
 102             res += '%s' % fmtoutfn(self.name)
 103         res += "<-mkDWire(0);"
 104         return res
 105
 106
 107 class Interface(object):
 108     """ create an interface from a list of pinspecs.
 109         each pinspec is a dictionary, see Pin class arguments
 110         single indicates that there is only one of these, and
 111         so the name must *not* be extended numerically (see pname)
 112     """
 113     # sample interface object:
 114     """
 115     twiinterface_decl = Interface('twi',
 116                                   [{'name': 'sda', 'outen': True},
 117                                    {'name': 'scl', 'outen': True},
 118                                    ])
 119     """
 120
 121     def __init__(self, ifacename, pinspecs, ganged=None, single=False):
 122         self.ifacename = ifacename
 123         self.ganged = ganged or {}
 124         self.pins = []  # a list of instances of class Pin
 125         self.pinspecs = pinspecs  # a list of dictionary
 126         self.single = single
 127         self.slow = None
 128         slow = slowfactory.getcls(ifacename)
 129         if slow:
 130             self.slow = slow()
 131
 132         for p in pinspecs:
 133             _p = {}
 134             _p.update(p)
 135             if 'type' in _p:
 136                 del _p['type']
 137             if p.get('outen') is True:  # special case, generate 3 pins
 138                 del _p['outen']
 139                 for psuffix in ['out', 'outen', 'in']:
 140                     # changing the name (like sda) to (twi_sda_out)
 141                     _p['name'] = "%s_%s" % (self.pname(p['name']), psuffix)
 142                     _p['action'] = psuffix != 'in'
 143                     self.pins.append(Pin(**_p))
 144                     # will look like {'name': 'twi_sda_out', 'action': True}
 145                     # {'name': 'twi_sda_outen', 'action': True}
 146                     #{'name': 'twi_sda_in', 'action': False}
 147                     # NOTice - outen key is removed
 148             else:
 149                 _p['name'] = self.pname(p['name'])
 150                 self.pins.append(Pin(**_p))
 151
 152     # sample interface object:
 153     """
 154         uartinterface_decl = Interface('uart',
 155                                    [{'name': 'rx'},
 156                                     {'name': 'tx', 'action': True},
 157                                     ])
 158     """
 159     """
 160     getifacetype is called multiple times in actual_pinmux.py
 161     x = ifaces.getifacetype(temp), where temp is uart_rx, spi_mosi
 162     Purpose is to identify is function : input/output/inout
 163     """
 164
 165     def getifacetype(self, name):
 166         for p in self.pinspecs:
 167             fname = "%s_%s" % (self.ifacename, p['name'])
 168             # print "search", self.ifacename, name, fname
 169             if fname == name:
 170                 if p.get('action'):
 171                     return 'out'
 172                 elif p.get('outen'):
 173                     return 'inout'
 174                 return 'input'
 175         return None
 176
 177     def pname(self, name):
 178         """ generates the interface spec e.g. flexbus_ale
 179             if there is only one flexbus interface, or
 180             sd{0}_cmd if there are several.  string format
 181             function turns this into sd0_cmd, sd1_cmd as
 182             appropriate.  single mode stops the numerical extension.
 183         """
 184         if self.single:
 185             return '%s_%s' % (self.ifacename, name)
 186         return '%s{0}_%s' % (self.ifacename, name)
 187
 188     def busfmt(self, *args):
 189         """ this function creates a bus "ganging" system based
 190             on input from the {interfacename}.txt file.
 191             only inout pins that are under the control of the
 192             interface may be "ganged" together.
 193         """
 194         if not self.ganged:
 195             return ''  # when self.ganged is None
 196         # print self.ganged
 197         res = []
 198         for (k, pnames) in self.ganged.items():
 199             name = self.pname('%senable' % k).format(*args)
 200             decl = 'Bit#(1) %s = 0;' % name
 201             res.append(decl)
 202             ganged = []
 203             for p in self.pinspecs:
 204                 if p['name'] not in pnames:
 205                     continue
 206                 pname = self.pname(p['name']).format(*args)
 207                 if p.get('outen') is True:
 208                     outname = self.ifacefmtoutfn(pname)
 209                     ganged.append("%s_outen" % outname)  # match wirefmt
 210
 211             gangedfmt = '{%s} = duplicate(%s);'
 212             res.append(gangedfmt % (',\n  '.join(ganged), name))
 213         return '\n'.join(res) + '\n\n'
 214
 215     def wirefmt(self, *args):
 216         res = '\n'.join(map(self.wirefmtpin, self.pins)).format(*args)
 217         res += '\n'
 218         return '\n' + res
 219
 220     def ifacefmt(self, *args):
 221         res = '\n'.join(map(self.ifacefmtdecpin, self.pins)).format(*args)
 222         return '\n' + res  # pins is a list
 223
 224     def ifacefmtdecfn(self, name):
 225         return name  # like: uart
 226
 227     def ifacefmtdecfn2(self, name):
 228         return name  # like: uart
 229
 230     def ifacefmtdecfn3(self, name):
 231         """ HACK! """
 232         return "%s_outen" % name  # like uart_outen
 233
 234     def ifacefmtoutfn(self, name):
 235         return "wr%s" % name  # like wruart
 236
 237     def ifacefmtinfn(self, name):
 238         return "wr%s" % name
 239
 240     def wirefmtpin(self, pin):
 241         return pin.wirefmt(self.ifacefmtoutfn, self.ifacefmtinfn,
 242                            self.ifacefmtdecfn2)
 243
 244     def ifacefmtdecpin(self, pin):
 245         return pin.ifacefmt(self.ifacefmtdecfn)
 246
 247     def ifacefmtpin(self, pin):
 248         decfn = self.ifacefmtdecfn2
 249         outfn = self.ifacefmtoutfn
 250         # print pin, pin.outenmode
 251         if pin.outenmode:
 252             decfn = self.ifacefmtdecfn3
 253             outfn = self.ifacefmtoutenfn
 254         return pin.ifacedef(outfn, self.ifacefmtinfn,
 255                             decfn)
 256
 257     def ifacedef(self, *args):
 258         res = '\n'.join(map(self.ifacefmtpin, self.pins))
 259         res = res.format(*args)
 260         return '\n' + res + '\n'
 261
 262     def slowimport(self):
 263         if not self.slow:
 264             return ''
 265         return self.slow.importfn().format()
 266
 267     def slowifdecl(self, count):
 268         if not self.slow:
 269             return ''
 270         return self.slow.ifacedecl().format(count, self.ifacename)
 271
 272     def axi_reg_def(self, start, count):
 273         if not self.slow:
 274             return ('', 0)
 275         return self.slow.axi_reg_def(start, self.ifacename, count)
 276
 277     def axi_slave_idx(self, start, count):
 278         if not self.slow:
 279             return ('', 0)
 280         return self.slow.axi_slave_idx(start, self.ifacename, count)
 281
 282
 283 class MuxInterface(Interface):
 284
 285     def wirefmt(self, *args):
 286         return muxwire.format(*args)
 287
 288
 289 class IOInterface(Interface):
 290
 291     def ifacefmtoutenfn(self, name):
 292         return "cell{0}_mux_outen"
 293
 294     def ifacefmtoutfn(self, name):
 295         """ for now strip off io{0}_ part """
 296         return "cell{0}_mux_out"
 297
 298     def ifacefmtinfn(self, name):
 299         return "cell{0}_mux_in"
 300
 301     def wirefmt(self, *args):
 302         return generic_io.format(*args)
 303
 304
 305 class Interfaces(InterfacesBase):
 306     """ contains a list of interface definitions
 307     """
 308
 309     def __init__(self, pth=None):
 310         InterfacesBase.__init__(self, Interface, pth)
 311
 312     def ifacedef(self, f, *args):
 313         for (name, count) in self.ifacecount:
 314             for i in range(count):
 315                 f.write(self.data[name].ifacedef(i))
 316
 317     def busfmt(self, f, *args):
 318         f.write("import BUtils::*;\n\n")
 319         for (name, count) in self.ifacecount:
 320             for i in range(count):
 321                 bf = self.data[name].busfmt(i)
 322                 f.write(bf)
 323
 324     def ifacefmt(self, f, *args):
 325         comment = '''
 326           // interface declaration between %s-{0} and pinmux'''
 327         for (name, count) in self.ifacecount:
 328             for i in range(count):
 329                 c = comment % name.upper()
 330                 f.write(c.format(i))
 331                 f.write(self.data[name].ifacefmt(i))
 332
 333     def wirefmt(self, f, *args):
 334         comment = '\n      // following wires capture signals ' \
 335                   'to IO CELL if %s-{0} is\n' \
 336                   '      // allotted to it'
 337         for (name, count) in self.ifacecount:
 338             for i in range(count):
 339                 c = comment % name
 340                 f.write(c.format(i))
 341                 f.write(self.data[name].wirefmt(i))
 342
 343     def slowimport(self, *args):
 344         ret = []
 345         for (name, count) in self.ifacecount:
 346             ret.append(self.data[name].slowimport())
 347         return '\n'.join(list(filter(None, ret)))
 348
 349     def slowifdecl(self, *args):
 350         ret = []
 351         for (name, count) in self.ifacecount:
 352             for i in range(count):
 353                 ret.append(self.data[name].slowifdecl(i))
 354         return '\n'.join(list(filter(None, ret)))
 355
 356     def axi_reg_def(self, *args):
 357         ret = []
 358         start = 0x00011100  # start of AXI peripherals address
 359         for (name, count) in self.ifacecount:
 360             for i in range(count):
 361                 x = self.data[name].axi_reg_def(start, i)
 362                 print ("ifc", name, x)
 363                 (rdef, offs) = x
 364                 ret.append(rdef)
 365                 start += offs
 366         return '\n'.join(list(filter(None, ret)))
 367
 368     def axi_slave_idx(self, *args):
 369         ret = []
 370         start = 0
 371         for (name, count) in self.ifacecount:
 372             for i in range(count):
 373                 (rdef, offs) = self.data[name].axi_slave_idx(start, i)
 374                 print ("ifc", name, rdef, offs)
 375                 ret.append(rdef)
 376                 start += offs
 377         ret.append("typedef %d LastGen_slave_num" % (start-1))
 378         decls = '\n'.join(list(filter(None, ret)))
 379         return axi_slave_declarations.format(decls)
 380
 381
 382 # ========= Interface declarations ================ #
 383
 384 mux_interface = MuxInterface('cell',
 385                              [{'name': 'mux', 'ready': False, 'enabled': False,
 386                                'bitspec': '{1}', 'action': True}])
 387
 388 io_interface = IOInterface(
 389     'io',
 390     [{'name': 'cell_out', 'enabled': True, },
 391      {'name': 'cell_outen', 'enabled': True, 'outenmode': True, },
 392      {'name': 'cell_in', 'action': True, 'io': True}, ])
 393
 394 # == Peripheral Interface definitions == #
 395 # these are the interface of the peripherals to the pin mux
 396 # Outputs from the peripherals will be inputs to the pinmux
 397 # module. Hence the change in direction for most pins
 398
 399 # ======================================= #
 400
 401 # basic test
 402 if __name__ == '__main__':
 403
 404     uartinterface_decl = Interface('uart',
 405                                    [{'name': 'rx'},
 406                                     {'name': 'tx', 'action': True},
 407                                     ])
 408
 409     twiinterface_decl = Interface('twi',
 410                                   [{'name': 'sda', 'outen': True},
 411                                    {'name': 'scl', 'outen': True},
 412                                    ])
 413
 414     def _pinmunge(p, sep, repl, dedupe=True):
 415         """ munges the text so it's easier to compare.
 416             splits by separator, strips out blanks, re-joins.
 417         """
 418         p = p.strip()
 419         p = p.split(sep)
 420         if dedupe:
 421             p = filter(lambda x: x, p)  # filter out blanks
 422         return repl.join(p)
 423
 424     def pinmunge(p):
 425         """ munges the text so it's easier to compare.
 426         """
 427         # first join lines by semicolons, strip out returns
 428         p = p.split(";")
 429         p = map(lambda x: x.replace('\n', ''), p)
 430         p = '\n'.join(p)
 431         # now split first by brackets, then spaces (deduping on spaces)
 432         p = _pinmunge(p, "(", " ( ", False)
 433         p = _pinmunge(p, ")", " ) ", False)
 434         p = _pinmunge(p, " ", " ")
 435         return p
 436
 437     def zipcmp(l1, l2):
 438         l1 = l1.split("\n")
 439         l2 = l2.split("\n")
 440         for p1, p2 in zip(l1, l2):
 441             print (repr(p1))
 442             print (repr(p2))
 443             print ()
 444             assert p1 == p2
 445
 446     ifaces = Interfaces()
 447
 448     ifaceuart = ifaces['uart']
 449     print (ifaceuart.ifacedef(0))
 450     print (uartinterface_decl.ifacedef(0))
 451     assert ifaceuart.ifacedef(0) == uartinterface_decl.ifacedef(0)
 452
 453     ifacetwi = ifaces['twi']
 454     print (ifacetwi.ifacedef(0))
 455     print (twiinterface_decl.ifacedef(0))
 456     assert ifacetwi.ifacedef(0) == twiinterface_decl.ifacedef(0)