litex/soc/integration/soc.py

   1 #!/usr/bin/env python3
   2
   3 # This file is Copyright (c) 2020 Florent Kermarrec <florent@enjoy-digital.fr>
   4 # License: BSD
   5
   6 import logging
   7 import time
   8 import datetime
   9
  10 from migen import *
  11
  12 from litex.soc.interconnect import wishbone
  13
  14 # TODO:
  15 # - replace raise with exit on logging error.
  16 # - use common module for SoCCSR/SoCIRQ.
  17 # - add configurable CSR paging.
  18 # - manage IO/Linker regions.
  19
  20 logging.basicConfig(level=logging.INFO)
  21
  22 # Helpers ------------------------------------------------------------------------------------------
  23 def colorer(s, color="bright"):
  24     header  = {
  25         "bright": "\x1b[1m",
  26         "green":  "\x1b[32m",
  27         "cyan":   "\x1b[36m",
  28         "red":    "\x1b[31m",
  29         "yellow": "\x1b[33m",
  30         "underline": "\x1b[4m"}[color]
  31     trailer = "\x1b[0m"
  32     return header + str(s) + trailer
  33
  34 def buildtime(with_time=True):
  35     fmt = "%Y-%m-%d %H:%M:%S" if with_time else "%Y-%m-%d"
  36     return datetime.datetime.fromtimestamp(time.time()).strftime("%Y-%m-%d %H:%M:%S")
  37
  38 # SoCRegion ----------------------------------------------------------------------------------------
  39
  40 class SoCRegion:
  41     def __init__(self, origin=None, size=None, cached=True):
  42         self.logger = logging.getLogger("SoCRegion")
  43         self.origin = origin
  44         self.size   = size
  45         self.cached = cached
  46
  47     def decoder(self):
  48         origin = self.origin
  49         size   = self.size
  50         origin &= ~0x80000000
  51         size   = 2**log2_int(size, False)
  52         if (origin & (size - 1)) != 0:
  53             self.logger.error("Origin needs to be aligned on size:")
  54             self.logger.error(self)
  55             raise
  56         origin >>= 2 # bytes to words aligned
  57         size   >>= 2 # bytes to words aligned
  58         return lambda a: (a[log2_int(size):-1] == (origin >> log2_int(size)))
  59
  60     def __str__(self):
  61         r = ""
  62         if self.origin is not None:
  63             r += "Origin: {}, ".format(colorer("0x{:08x}".format(self.origin)))
  64         if self.size is not None:
  65             r += "Size: {}, ".format(colorer("0x{:08x}".format(self.size)))
  66         r += "Cached: {}".format(colorer(self.cached))
  67         return r
  68
  69
  70 class SoCLinkerRegion(SoCRegion):
  71     pass
  72
  73 # SoCBus -------------------------------------------------------------------------------------------
  74
  75 class SoCBus:
  76     supported_standard      = ["wishbone"]
  77     supported_data_width    = [32, 64]
  78     supported_address_width = [32]
  79
  80     # Creation -------------------------------------------------------------------------------------
  81     def __init__(self, standard, data_width=32, address_width=32, timeout=1e6, reserved_regions={}):
  82         self.logger = logging.getLogger("SoCBus")
  83         self.logger.info(colorer("Creating new Bus Handler...", color="cyan"))
  84
  85         # Check Standard
  86         if standard not in self.supported_standard:
  87             self.logger.error("Unsupported Standard: {} supporteds: {:s}".format(
  88                 colorer(standard, color="red"),
  89                 colorer(", ".join(self.supported_standard), color="green")))
  90             raise
  91
  92         # Check Data Width
  93         if data_width not in self.supported_data_width:
  94             self.logger.error("Unsupported Data_Width: {} supporteds: {:s}".format(
  95                 colorer(data_width, color="red"),
  96                 colorer(", ".join(str(x) for x in self.supported_data_width), color="green")))
  97             raise
  98
  99         # Check Address Width
 100         if address_width not in self.supported_address_width:
 101             self.logger.error("Unsupported Address Width: {} supporteds: {:s}".format(
 102                 colorer(data_width, color="red"),
 103                 colorer(", ".join(str(x) for x in self.supported_address_width), color="green")))
 104             raise
 105
 106         # Create Bus
 107         self.standard      = standard
 108         self.data_width    = data_width
 109         self.address_width = address_width
 110         self.masters       = {}
 111         self.slaves        = {}
 112         self.regions       = {}
 113         self.timeout       = timeout
 114         self.logger.info("{}-bit {} Bus, {}GiB Address Space.".format(
 115             colorer(data_width), colorer(standard), colorer(2**address_width/2**30)))
 116
 117         # Adding reserved regions
 118         self.logger.info("Adding {} Regions...".format(colorer("reserved")))
 119         for name, region in reserved_regions.items():
 120             if isinstance(region, int):
 121                 region = SoCRegion(origin=region, size=0x1000000)
 122             self.add_region(name, region)
 123
 124         self.logger.info(colorer("Bus Handler created.", color="cyan"))
 125
 126     # Add/Allog/Check Regions ----------------------------------------------------------------------
 127     def add_region(self, name, region):
 128         allocated = False
 129         # Check if SoCLinkerRegion
 130         if isinstance(region, SoCLinkerRegion):
 131             self.logger.info("FIXME: SoCLinkerRegion")
 132         # Check if SoCRegion
 133         elif isinstance(region, SoCRegion):
 134             # If no origin specified, allocate region.
 135             if region.origin is None:
 136                 allocated = True
 137                 region    = self.alloc_region(region.size, region.cached)
 138                 self.regions[name] = region
 139             # Else add region and check for overlaps.
 140             else:
 141                 self.regions[name] = region
 142                 overlap = self.check_region(self.regions)
 143                 if overlap is not None:
 144                     self.logger.error("Region overlap between {} and {}:".format(
 145                         colorer(overlap[0], color="red"),
 146                         colorer(overlap[1], color="red")))
 147                     self.logger.error(str(self.regions[overlap[0]]))
 148                     self.logger.error(str(self.regions[overlap[1]]))
 149                     raise
 150             self.logger.info("{} Region {} {}.".format(
 151                 colorer(name, color="underline"),
 152                 colorer("allocated" if allocated else "added", color="yellow" if allocated else "green"),
 153                 str(region)))
 154         else:
 155             self.logger.error("{} is not a supported Region".format(colorer(name, color="red")))
 156             raise
 157
 158     def alloc_region(self, size, cached=True):
 159         self.logger.info("Allocating {} Region of size {}...".format(
 160             colorer("Cached" if cached else "IO"),
 161             colorer("0x{:08x}".format(size))))
 162
 163         # Limit Search Regions
 164         uncached_regions = {}
 165         for _, region in self.regions.items():
 166             if region.cached == False:
 167                 uncached_regions[name] = region
 168         if cached == False:
 169             search_regions = uncached_regions
 170         else:
 171             search_regions = {"main": SoCRegion(origin=0x00000000, size=2**self.address_width-1)}
 172
 173         # Iterate on Search_Regions to find a Candidate
 174         for _, search_region in search_regions.items():
 175             origin = search_region.origin
 176             while (origin + size) < (search_region.origin + search_region.size):
 177                 # Create a Candicate.
 178                 candidate = SoCRegion(origin=origin, size=size, cached=cached)
 179                 overlap   = False
 180                 # Check Candidate does not overlap with allocated existing regions
 181                 for _, allocated in self.regions.items():
 182                     if self.check_region({"0": allocated, "1": candidate}) is not None:
 183                         origin  = allocated.origin + allocated.size
 184                         overlap = True
 185                         break
 186                 if not overlap:
 187                     # If no overlap, the Candidate is selected
 188                     return candidate
 189
 190         self.logger.error("Not enough Address Space to allocate Region")
 191         raise
 192
 193     def check_region(self, regions):
 194         i = 0
 195         while i < len(regions):
 196             n0 =  list(regions.keys())[i]
 197             r0 = regions[n0]
 198             for n1 in list(regions.keys())[i+1:]:
 199                 r1 = regions[n1]
 200                 if isinstance(r0, SoCLinkerRegion) or isinstance(r1, SoCLinkerRegion):
 201                     continue
 202                 if r0.origin >= (r1.origin + r1.size):
 203                     continue
 204                 if r1.origin >= (r0.origin + r0.size):
 205                     continue
 206                 return (n0, n1)
 207             i += 1
 208         return None
 209
 210     # Add Master/Slave -----------------------------------------------------------------------------
 211     def add_master(self, name=None, master=None, io_regions={}):
 212         if name is None:
 213             name = "master{:d}".format(len(self.masters))
 214         if name in self.masters.keys():
 215             self.logger.error("{} already declared as Bus Master:".format(colorer(name, color="red")))
 216             self.logger.error(self)
 217             raise
 218         self.masters[name] = master
 219         self.logger.info("{} {} as Bus Master.".format(colorer(name, color="underline"), colorer("added", color="green")))
 220         # FIXME: handle IO regions
 221
 222     def add_slave(self, name=None, slave=None, region=None):
 223         no_name   = name is None
 224         no_region = region is None
 225         if no_name and no_region:
 226             self.logger.error("Please specify at least {} or {} of Bus Slave".format(
 227                 colorer("name",   color="red"),
 228                 colorer("region", color="red")))
 229             raise
 230         if no_name:
 231             name = "slave{:d}".format(len(self.slaves))
 232         if no_region:
 233             region = self.regions.get(name, None)
 234             if region is None:
 235                 self.logger.error("Unable to find Region {}".format(colorer(name, color="red")))
 236                 raise
 237         else:
 238              self.add_region(name, region)
 239         if name in self.slaves.keys():
 240             self.logger.error("{} already declared as Bus Slave:".format(colorer(name, color="red")))
 241             self.logger.error(self)
 242             raise
 243         self.slaves[name] = slave
 244         self.logger.info("{} {} as Bus Slave.".format(
 245             colorer(name, color="underline"),
 246             colorer("added", color="green")))
 247
 248     # Str ------------------------------------------------------------------------------------------
 249     def __str__(self):
 250         r = "{}-bit {} Bus, {}GiB Address Space.\n".format(
 251             colorer(self.data_width), colorer(self.standard), colorer(2**self.address_width/2**30))
 252         r += "Bus Regions: ({})\n".format(len(self.regions.keys())) if len(self.regions.keys()) else ""
 253         for name, region in self.regions.items():
 254            r += colorer(name, color="underline") + " "*(20-len(name)) + ": " + str(region) + "\n"
 255         r += "Bus Masters: ({})\n".format(len(self.masters.keys())) if len(self.masters.keys()) else ""
 256         for name in self.masters.keys():
 257            r += "- {}\n".format(colorer(name, color="underline"))
 258         r += "Bus Slaves: ({})\n".format(len(self.slaves.keys())) if len(self.slaves.keys()) else ""
 259         for name in self.slaves.keys():
 260            r += "- {}\n".format(colorer(name, color="underline"))
 261         r = r[:-1]
 262         return r
 263
 264 # SoCCSR ----------------------------------------------------------------------------------------
 265
 266 class SoCCSR:
 267     supported_data_width    = [8, 32]
 268     supported_address_width = [14, 15]
 269     supported_alignment     = [32, 64]
 270     supported_paging        = [0x800]
 271
 272     # Creation -------------------------------------------------------------------------------------
 273     def __init__(self, data_width=32, address_width=14, alignment=32, paging=0x800, reserved_csrs={}):
 274         self.logger = logging.getLogger("SoCCSR")
 275         self.logger.info(colorer("Creating new CSR Handler...", color="cyan"))
 276
 277         # Check Data Width
 278         if data_width not in self.supported_data_width:
 279             self.logger.error("Unsupported data_width: {} supporteds: {:s}".format(
 280                 colorer(data_width, color="red"),
 281                 colorer(", ".join(str(x) for x in self.supported_data_width)), color="green"))
 282             raise
 283
 284         # Check Address Width
 285         if address_width not in self.supported_address_width:
 286             self.logger.error("Unsupported address_width: {} supporteds: {:s}".format(
 287                 colorer(address_width, color="red"),
 288                 colorer(", ".join(str(x) for x in self.supported_address_width), color="green")))
 289             raise
 290
 291         # Check Alignment
 292         if alignment not in self.supported_alignment:
 293             self.logger.error("Unsupported alignment: {} supporteds: {:s}".format(
 294                 colorer(alignment, color="red"),
 295                 colorer(", ".join(str(x) for x in self.supported_alignment), color="green")))
 296             raise
 297
 298         # Check Paging
 299         if paging not in self.supported_paging:
 300             self.logger.error("Unsupported paging: {} supporteds: {:s}".format(
 301                 colorer(paging, color="red"),
 302                 colorer(", ".join(str(x) for x in self.supported_paging), color="green")))
 303             raise
 304
 305         # Create CSR Handler
 306         self.data_width    = data_width
 307         self.address_width = address_width
 308         self.alignment     = alignment
 309         self.paging        = paging
 310         self.csrs          = {}
 311         self.n_csrs        = 4*2**address_width//paging # FIXME
 312         self.logger.info("{}-bit CSR Bus, {}KiB Address Space, {}B Paging (Up to {} Locations).\n".format(
 313             colorer(self.data_width),
 314             colorer(2**self.address_width/2**10),
 315             colorer(self.paging),
 316             self.n_csrs))
 317
 318         # Adding reserved CSRs
 319         self.logger.info("Adding {} CSRs...".format(colorer("reserved")))
 320         for name, n in reserved_csrs.items():
 321             self.add(name, n)
 322
 323         self.logger.info(colorer("CSR Bus Handler created.", color="cyan"))
 324
 325     # Add ------------------------------------------------------------------------------------------
 326     def add(self, name, n=None, use_loc_if_exists=False):
 327         allocated = False
 328         if not (use_loc_if_exists and name in self.csrs.keys()):
 329             if name in self.csrs.keys():
 330                 self.logger.error("{} CSR name already used.".format(colorer(name, "red")))
 331                 self.logger.error(self)
 332                 raise
 333             if n in self.csrs.values():
 334                 self.logger.error("{} CSR Location already used.".format(colorer(n, "red")))
 335                 self.logger.error(self)
 336                 raise
 337             if n is None:
 338                 allocated = True
 339                 n = self.alloc(name)
 340             else:
 341                 if n < 0:
 342                     self.logger.error("{} CSR Location should be positive.".format(
 343                         colorer(n, color="red")))
 344                     raise
 345                 if n > self.n_csrs:
 346                     self.logger.error("{} CSR Location too high (Up to {}).".format(
 347                         colorer(n, color="red"),
 348                         colorer(self.n_csrs, color="green")))
 349                     raise
 350             self.csrs[name] = n
 351         else:
 352             n = self.csrs[name]
 353         self.logger.info("{} CSR {} at Location {}.".format(
 354             colorer(name, color="underline"),
 355             colorer("allocated" if allocated else "added", color="yellow" if allocated else "green"),
 356             colorer(n)))
 357
 358     # Alloc ----------------------------------------------------------------------------------------
 359     def alloc(self, name):
 360         for n in range(self.data_width//8*2**self.address_width//self.paging):
 361             if n not in self.csrs.values():
 362                 return n
 363         self.logger.error("Not enough CSR Locations.")
 364         self.logger.error(self)
 365         raise
 366
 367     # Str ------------------------------------------------------------------------------------------
 368     def __str__(self):
 369         r = "{}-bit CSR Bus, {}KiB Address Space, {}B Paging (Up to {} Locations).\n".format(
 370             colorer(self.data_width),
 371             colorer(2**self.address_width/2**10),
 372             colorer(self.paging),
 373             self.n_csrs)
 374         r += "CSR Locations: ({})\n".format(len(self.csrs.keys())) if len(self.csrs.keys()) else ""
 375         for name in self.csrs.keys():
 376            r += "- {}{}: {}\n".format(colorer(name, color="underline"), " "*(20-len(name)), colorer(self.csrs[name]))
 377         r = r[:-1]
 378         return r
 379
 380 # SoCIRQ -------------------------------------------------------------------------------------------
 381
 382 class SoCIRQ:
 383     # Creation -------------------------------------------------------------------------------------
 384     def __init__(self, n_irqs=32, reserved_irqs={}):
 385         self.logger = logging.getLogger("SoCIRQ")
 386         self.logger.info(colorer("Creating new SoC IRQ Handler...", color="cyan"))
 387
 388         # Check IRQ Number
 389         if n_irqs > 32:
 390             self.logger.error("Unsupported IRQs number: {} supporteds: {:s}".format(
 391                 colorer(n, color="red"), colorer("Up to 32", color="green")))
 392             raise
 393
 394         # Create IRQ Handler
 395         self.n_irqs = n_irqs
 396         self.irqs   = {}
 397         self.logger.info("IRQ Handler (up to {} Locations).".format(colorer(n_irqs)))
 398
 399         # Adding reserved IRQs
 400         self.logger.info("Adding {} IRQs...".format(colorer("reserved")))
 401         for name, n in reserved_irqs.items():
 402             self.add(name, n)
 403
 404         self.logger.info(colorer("IRQ Handler created.", color="cyan"))
 405
 406     # Add ------------------------------------------------------------------------------------------
 407     def add(self, name, n=None):
 408         allocated = False
 409         if name in self.irqs.keys():
 410             self.logger.error("{} IRQ name already used.".format(colorer(name, "red")))
 411             self.logger.error(self)
 412             raise
 413         if n in self.irqs.values():
 414             self.logger.error("{} IRQ Location already used.".format(colorer(n, "red")))
 415             self.logger.error(self)
 416             raise
 417         if n is None:
 418             allocated = True
 419             n = self.alloc(name)
 420         else:
 421             if n < 0:
 422                 self.logger.error("{} IRQ Location should be positive.".format(
 423                     colorer(n, color="red")))
 424                 raise
 425             if n > self.n_irqs:
 426                 self.logger.error("{} IRQ Location too high (Up to {}).".format(
 427                     colorer(n, color="red"),
 428                     colorer(self.n_csrs, color="green")))
 429                 raise
 430         self.irqs[name] = n
 431         self.logger.info("{} IRQ {} at Location {}.".format(
 432             colorer(name, color="underline"),
 433             colorer("allocated" if allocated else "added", color="yellow" if allocated else "green"),
 434             colorer(n)))
 435
 436     # Alloc ----------------------------------------------------------------------------------------
 437     def alloc(self, name):
 438         for n in range(self.n_irqs):
 439             if n not in self.irqs.values():
 440                 return n
 441         self.logger.error("Not enough Locations.")
 442         self.logger.error(self)
 443         raise
 444
 445     # Str ------------------------------------------------------------------------------------------
 446     def __str__(self):
 447         r ="IRQ Handler (up to {} Locations).\n".format(colorer(self.n_irqs))
 448         r += "IRQs Locations:\n" if len(self.irqs.keys()) else ""
 449         for name in self.irqs.keys():
 450            r += "- {}{}: {}\n".format(colorer(name, color="underline"), " "*(20-len(name)), colorer(self.irqs[name]))
 451         r = r[:-1]
 452         return r
 453
 454 # SoC ----------------------------------------------------------------------------------------------
 455
 456 class SoC(Module):
 457     def __init__(self,
 458         bus_standard         = "wishbone",
 459         bus_data_width       = 32,
 460         bus_address_width    = 32,
 461         bus_timeout          = 1e6,
 462         bus_reserved_regions = {},
 463
 464         csr_data_width       = 32,
 465         csr_address_width    = 14,
 466         csr_alignment        = 32,
 467         csr_paging           = 0x800,
 468         csr_reserved_csrs    = {},
 469
 470         irq_n_irqs           = 32,
 471         irq_reserved_irqs    = {},
 472         ):
 473
 474         self.logger = logging.getLogger("SoC")
 475         self.logger.info(colorer("        __   _ __      _  __  ", color="bright"))
 476         self.logger.info(colorer("       / /  (_) /____ | |/_/  ", color="bright"))
 477         self.logger.info(colorer("      / /__/ / __/ -_)>  <    ", color="bright"))
 478         self.logger.info(colorer("     /____/_/\\__/\\__/_/|_|  ", color="bright"))
 479         self.logger.info(colorer("  Build your hardware, easily!", color="bright"))
 480
 481         self.logger.info(colorer("-"*80, color="bright"))
 482         self.logger.info(colorer("Creating new SoC... ({})".format(buildtime()), color="cyan"))
 483         self.logger.info(colorer("-"*80, color="bright"))
 484
 485         # SoC Bus Handler --------------------------------------------------------------------------
 486         self.bus = SoCBus(
 487             standard         = bus_standard,
 488             data_width       = bus_data_width,
 489             address_width    = bus_address_width,
 490             timeout          = bus_timeout,
 491             reserved_regions = bus_reserved_regions,
 492            )
 493
 494         # SoC Bus Handler --------------------------------------------------------------------------
 495         self.csr = SoCCSR(
 496             data_width    = csr_data_width,
 497             address_width = csr_address_width,
 498             alignment     = csr_alignment,
 499             paging        = csr_paging,
 500             reserved_csrs = csr_reserved_csrs,
 501         )
 502
 503         # SoC IRQ Handler --------------------------------------------------------------------------
 504         self.irq = SoCIRQ(
 505             n_irqs        = irq_n_irqs,
 506             reserved_irqs = irq_reserved_irqs
 507         )
 508
 509         self.logger.info(colorer("-"*80, color="bright"))
 510         self.logger.info(colorer("Initial SoC:", color="cyan"))
 511         self.logger.info(colorer("-"*80, color="bright"))
 512         self.logger.info(self.bus)
 513         self.logger.info(self.csr)
 514         self.logger.info(self.irq)
 515         self.logger.info(colorer("-"*80, color="bright"))
 516
 517
 518     def do_finalize(self):
 519         self.logger.info(colorer("-"*80, color="bright"))
 520         self.logger.info(colorer("Finalized SoC:", color="cyan"))
 521         self.logger.info(colorer("-"*80, color="bright"))
 522         self.logger.info(self.bus)
 523         self.logger.info(self.csr)
 524         self.logger.info(self.irq)
 525         self.logger.info(colorer("-"*80, color="bright"))
 526
 527         # SoC Bus Interconnect ---------------------------------------------------------------------
 528         bus_masters = self.bus.masters.values()
 529         bus_slaves  = [(self.bus.regions[n].decoder(), s) for n, s in self.bus.slaves.items()]
 530         if len(bus_masters) and len(bus_slaves):
 531             self.submodules.bus_interconnect = wishbone.InterconnectShared(
 532                 masters        = bus_masters,
 533                 slaves         = bus_slaves,
 534                 register       = True,
 535                 timeout_cycles = self.bus.timeout)
 536
 537         #exit()
 538
 539 # Test (FIXME: move to litex/text and improve) -----------------------------------------------------
 540
 541 if __name__ == "__main__":
 542     bus = SoCBus("wishbone", reserved_regions={
 543         "rom": SoCRegion(origin=0x00000100, size=1024),
 544         "ram": SoCRegion(size=512),
 545         }
 546     )
 547     bus.add_master("cpu", None)
 548     bus.add_slave("rom", None, SoCRegion(size=1024))
 549     bus.add_slave("ram", None, SoCRegion(size=1024))
 550
 551
 552     csr = SoCCSR(reserved_csrs={"ctrl": 0, "uart": 1})
 553     csr.add("csr0")
 554     csr.add("csr1", 0)
 555     #csr.add("csr2", 46)
 556     csr.add("csr3", -1)
 557     print(bus)
 558     print(csr)
 559
 560     irq = SoCIRQ(reserved_irqs={"uart": 1})
 561
 562     soc = SoC()