src/soc/litex/florent/libresoc/core.py

   1 import os
   2
   3 from migen import ClockSignal, ResetSignal, Signal, Instance, Cat
   4
   5 from litex.soc.interconnect import wishbone as wb
   6 from litex.soc.cores.cpu import CPU
   7
   8 from soc.config.pinouts import get_pinspecs
   9 from soc.debug.jtag import Pins
  10 from c4m.nmigen.jtag.tap import IOType
  11
  12 from libresoc.ls180 import io
  13 from litex.build.generic_platform import ConstraintManager
  14
  15
  16 CPU_VARIANTS = ["standard", "standard32", "standardjtag",
  17                 "standardjtagtestgpio", "ls180",
  18                 "standardjtagnoirq"]
  19
  20
  21 def make_wb_bus(prefix, obj, simple=False):
  22     res = {}
  23     outpins = ['stb', 'cyc', 'we', 'adr', 'dat_w', 'sel']
  24     if not simple:
  25         outpins += ['cti', 'bte']
  26     for o in outpins:
  27         res['o_%s__%s' % (prefix, o)] = getattr(obj, o)
  28     for i in ['ack', 'err', 'dat_r']:
  29         res['i_%s__%s' % (prefix, i)] = getattr(obj, i)
  30     return res
  31
  32 def make_wb_slave(prefix, obj):
  33     res = {}
  34     for i in ['stb', 'cyc', 'cti', 'bte', 'we', 'adr', 'dat_w', 'sel']:
  35         res['i_%s__%s' % (prefix, i)] = getattr(obj, i)
  36     for o in ['ack', 'err', 'dat_r']:
  37         res['o_%s__%s' % (prefix, o)] = getattr(obj, o)
  38     return res
  39
  40 def make_pad(res, dirn, name, suffix, cpup, iop):
  41     print ("make pad", dirn, name, suffix, cpup, iop)
  42     cpud, iod = ('i', 'o') if dirn else ('o', 'i')
  43     res['%s_%s__core__%s' % (cpud, name, suffix)] = cpup
  44     res['%s_%s__pad__%s' % (iod, name, suffix)] = iop
  45
  46 def get_field(rec, name):
  47     for f in rec.layout:
  48         f = f[0]
  49         if f.endswith(name):
  50             return getattr(rec, f)
  51
  52
  53 def make_jtag_ioconn(res, pin, cpupads, iopads):
  54     (fn, pin, iotype, pin_name, scan_idx) = pin
  55     #serial_tx__core__o, serial_rx__pad__i,
  56     # special-case sdram_clock
  57     if pin == 'clock' and fn == 'sdr':
  58         cpu = cpupads['sdram_clock']
  59         io = iopads['sdram_clock']
  60     else:
  61         cpu = cpupads[fn]
  62         io = iopads[fn]
  63     print ("cpupads", cpupads)
  64     print ("iopads", iopads)
  65     print ("pin", fn, pin, iotype, pin_name)
  66     print ("cpu fn", cpu)
  67     print ("io fn", io)
  68     name = "%s_%s" % (fn, pin)
  69     print ("name", name)
  70     sigs = []
  71
  72     if iotype in (IOType.In, IOType.Out):
  73         ps = pin.split("_")
  74         if pin == 'clock' and fn == 'sdr':
  75             cpup = cpu
  76             iop = io
  77         elif len(ps) == 2 and ps[-1].isdigit():
  78             pin, idx = ps
  79             idx = int(idx)
  80             cpup = getattr(cpu, pin)[idx]
  81             iop = getattr(io, pin)[idx]
  82         elif pin.isdigit():
  83             idx = int(pin)
  84             cpup = cpu[idx]
  85             iop = io[idx]
  86         else:
  87             cpup = getattr(cpu, pin)
  88             iop = getattr(io, pin)
  89
  90     if iotype == IOType.Out:
  91         # output from the pad is routed through C4M JTAG and so
  92         # is an *INPUT* into core.  ls180soc connects this to "real" peripheral
  93         make_pad(res, True, name, "o", cpup, iop)
  94
  95     elif iotype == IOType.In:
  96         # input to the pad is routed through C4M JTAG and so
  97         # is an *OUTPUT* into core.  ls180soc connects this to "real" peripheral
  98         make_pad(res, False, name, "i", cpup, iop)
  99
 100     elif iotype == IOType.InTriOut:
 101         if fn == 'gpio': # sigh decode GPIO special-case
 102             idx = int(pin[1:])
 103             oe_idx = idx
 104         elif fn == 'sdr': # sigh
 105             idx = int(pin.split('_')[-1])
 106             oe_idx = 0
 107         else:
 108             idx = 0
 109             oe_idx = 0
 110         print ("gpio tri", fn, pin, iotype, pin_name, scan_idx, idx)
 111         cpup, iop = get_field(cpu, "i")[idx], get_field(io, "i")[idx]
 112         make_pad(res, False, name, "i", cpup, iop)
 113         cpup, iop = get_field(cpu, "o")[idx], get_field(io, "o")[idx]
 114         make_pad(res, True, name, "o", cpup, iop)
 115         cpup, iop = get_field(cpu, "oe")[oe_idx], get_field(io, "oe")[oe_idx]
 116         make_pad(res, True, name, "oe", cpup, iop)
 117
 118     if iotype in (IOType.In, IOType.InTriOut):
 119         sigs.append(("i", 1))
 120     if iotype in (IOType.Out, IOType.TriOut, IOType.InTriOut):
 121         sigs.append(("o", 1))
 122     if iotype in (IOType.TriOut, IOType.InTriOut):
 123         sigs.append(("oe", 1))
 124
 125
 126 class LibreSoC(CPU):
 127     name                 = "libre_soc"
 128     human_name           = "Libre-SoC"
 129     variants             = CPU_VARIANTS
 130     endianness           = "little"
 131     gcc_triple           = ("powerpc64le-linux", "powerpc64le-linux-gnu")
 132     linker_output_format = "elf64-powerpcle"
 133     nop                  = "nop"
 134     io_regions           = {0xc0000000: 0x10000000} # origin, length
 135
 136     @property
 137     def mem_map(self):
 138         return {"csr": 0xc0000000}
 139
 140     @property
 141     def gcc_flags(self):
 142         flags  = "-m64 "
 143         flags += "-mabi=elfv2 "
 144         flags += "-msoft-float "
 145         flags += "-mno-string "
 146         flags += "-mno-multiple "
 147         flags += "-mno-vsx "
 148         flags += "-mno-altivec "
 149         flags += "-mlittle-endian "
 150         flags += "-mstrict-align "
 151         flags += "-fno-stack-protector "
 152         flags += "-mcmodel=small "
 153         flags += "-D__microwatt__ "
 154         return flags
 155
 156     def __init__(self, platform, variant="standard"):
 157         self.platform     = platform
 158         self.variant      = variant
 159         self.reset        = Signal()
 160
 161         irq_en = "noirq" not in variant
 162
 163         if irq_en:
 164             self.interrupt    = Signal(16)
 165
 166         if variant == "standard32":
 167             self.data_width           = 32
 168             self.dbus = dbus = wb.Interface(data_width=32, adr_width=30)
 169         else:
 170             self.dbus = dbus = wb.Interface(data_width=64, adr_width=29)
 171             self.data_width           = 64
 172         self.ibus = ibus = wb.Interface(data_width=64, adr_width=29)
 173
 174         self.xics_icp = icp = wb.Interface(data_width=32, adr_width=30)
 175         self.xics_ics = ics = wb.Interface(data_width=32, adr_width=30)
 176
 177         jtag_en = ('jtag' in variant) or variant == 'ls180'
 178
 179         if "testgpio" in variant:
 180             self.simple_gpio = gpio = wb.Interface(data_width=32, adr_width=30)
 181         if jtag_en:
 182             self.jtag_wb = jtag_wb = wb.Interface(data_width=64, adr_width=29)
 183
 184         self.periph_buses = [ibus, dbus]
 185         self.memory_buses = []
 186
 187         if jtag_en:
 188             self.periph_buses.append(jtag_wb)
 189             self.jtag_tck = Signal(1)
 190             self.jtag_tms = Signal(1)
 191             self.jtag_tdi = Signal(1)
 192             self.jtag_tdo = Signal(1)
 193         else:
 194             self.dmi_addr = Signal(4)
 195             self.dmi_din = Signal(64)
 196             self.dmi_dout = Signal(64)
 197             self.dmi_wr = Signal(1)
 198             self.dmi_ack = Signal(1)
 199             self.dmi_req = Signal(1)
 200
 201         # # #
 202
 203         self.cpu_params = dict(
 204             # Clock / Reset
 205             i_clk              = ClockSignal(),
 206             i_rst              = ResetSignal() | self.reset,
 207
 208             # Monitoring / Debugging
 209             i_pc_i             = 0,
 210             i_pc_i_ok          = 0,
 211             i_core_bigendian_i = 0, # Signal(),
 212             o_busy_o           = Signal(),   # not connected
 213             o_memerr_o         = Signal(),   # not connected
 214             o_pc_o             = Signal(64), # not connected
 215         )
 216
 217         if irq_en:
 218             # interrupts
 219             self.cpu_params['i_int_level_i'] = self.interrupt
 220
 221         if jtag_en:
 222             self.cpu_params.update(dict(
 223                 # JTAG Debug bus
 224                 o_TAP_bus__tdo = self.jtag_tdo,
 225                 i_TAP_bus__tdi = self.jtag_tdi,
 226                 i_TAP_bus__tms = self.jtag_tms,
 227                 i_TAP_bus__tck = self.jtag_tck,
 228             ))
 229         else:
 230             self.cpu_params.update(dict(
 231                 # DMI Debug bus
 232                 i_dmi_addr_i          = self.dmi_addr,
 233                 i_dmi_din             = self.dmi_din,
 234                 o_dmi_dout            = self.dmi_dout,
 235                 i_dmi_req_i           = self.dmi_req,
 236                 i_dmi_we_i            = self.dmi_wr,
 237                 o_dmi_ack_o           = self.dmi_ack,
 238             ))
 239
 240         # add clock select, pll output
 241         if variant == "ls180":
 242             self.pll_18_o = Signal()
 243             self.clk_sel = Signal(3)
 244             self.cpu_params['i_clk_sel_i'] = self.clk_sel
 245             self.cpu_params['o_pll_18_o'] = self.pll_18_o
 246
 247         # add wishbone buses to cpu params
 248         self.cpu_params.update(make_wb_bus("ibus", ibus))
 249         self.cpu_params.update(make_wb_bus("dbus", dbus))
 250         self.cpu_params.update(make_wb_slave("ics_wb", ics))
 251         self.cpu_params.update(make_wb_slave("icp_wb", icp))
 252         if "testgpio" in variant:
 253             self.cpu_params.update(make_wb_slave("gpio_wb", gpio))
 254         if jtag_en:
 255             self.cpu_params.update(make_wb_bus("jtag_wb", jtag_wb, simple=True))
 256
 257         if variant == 'ls180':
 258             # urr yuk.  have to expose iopads / pins from core to litex
 259             # then back again.  cut _some_ of that out by connecting
 260             self.padresources = io()
 261             self.pad_cm = ConstraintManager(self.padresources, [])
 262             self.cpupads = {}
 263             iopads = {}
 264             litexmap = {}
 265             subset = {'uart', 'mtwi', 'eint', 'gpio', 'mspi0', 'mspi1',
 266                       'pwm', 'sd0', 'sdr'}
 267             for periph in subset:
 268                 origperiph = periph
 269                 num = None
 270                 if periph[-1].isdigit():
 271                     periph, num = periph[:-1], int(periph[-1])
 272                 print ("periph request", periph, num)
 273                 if periph == 'mspi':
 274                     if num == 0:
 275                         periph, num = 'spimaster', None
 276                     else:
 277                         periph, num = 'spisdcard', None
 278                 elif periph == 'sdr':
 279                     periph = 'sdram'
 280                 elif periph == 'mtwi':
 281                     periph = 'i2c'
 282                 elif periph == 'sd':
 283                     periph, num = 'sdcard', None
 284                 litexmap[origperiph] = (periph, num)
 285                 self.cpupads[origperiph] = platform.request(periph, num)
 286                 iopads[origperiph] = self.pad_cm.request(periph, num)
 287                 if periph == 'sdram':
 288                     # special-case sdram clock
 289                     ck = platform.request("sdram_clock")
 290                     self.cpupads['sdram_clock'] = ck
 291                     ck = self.pad_cm.request("sdram_clock")
 292                     iopads['sdram_clock'] = ck
 293
 294             pinset = get_pinspecs(subset=subset)
 295             p = Pins(pinset)
 296             for pin in list(p):
 297                 make_jtag_ioconn(self.cpu_params, pin, self.cpupads, iopads)
 298
 299         # add verilog sources
 300         self.add_sources(platform)
 301
 302     def set_reset_address(self, reset_address):
 303         assert not hasattr(self, "reset_address")
 304         self.reset_address = reset_address
 305         assert reset_address == 0x00000000
 306
 307     @staticmethod
 308     def add_sources(platform):
 309         cdir = os.path.dirname(__file__)
 310         platform.add_source(os.path.join(cdir, "libresoc.v"))
 311
 312     def do_finalize(self):
 313         self.specials += Instance("test_issuer", **self.cpu_params)
 314