simplify litex-core wishbone interfaces

diff --git a/src/soc/interrupts/xics.py b/src/soc/interrupts/xics.py
index a0a852d3bd6ad61eb74634e3289743c0a0d6f133..ede33a1b03913307f33ce8080652d315c0403ce9 100644 (file)
--- a/src/soc/interrupts/xics.py
+++ b/src/soc/interrupts/xics.py
@@ -78,7 +78,7 @@ class XICS_ICP(Elaboratable):
         spec.addr_wid = 30
         spec.mask_wid = 4
         spec.reg_wid = 32
-        self.bus = Record(make_wb_layout(spec), name="icp_wb")
+        self.bus = Record(make_wb_layout(spec, cti=False), name="icp_wb")
         self.ics_i = ICS2ICP("ics_i")
         self.core_irq_o = Signal()
 
@@ -232,7 +232,7 @@ class XICS_ICS(Elaboratable):
         spec.addr_wid = 30
         spec.mask_wid = 4
         spec.reg_wid = 32
-        self.bus = Record(make_wb_layout(spec), name="ics_wb")
+        self.bus = Record(make_wb_layout(spec, cti=False), name="ics_wb")
 
         self.int_level_i = Signal(SRC_NUM)
         self.icp_o = ICS2ICP("icp_o")

diff --git a/src/soc/litex/florent/libresoc/core.py b/src/soc/litex/florent/libresoc/core.py
index 842a9f6e29b123e3ea00cb8d4805a72dc2d0fc87..55a84c97a6606c982aedc700627c009b0830893a 100644 (file)
--- a/src/soc/litex/florent/libresoc/core.py
+++ b/src/soc/litex/florent/libresoc/core.py
@@ -29,9 +29,12 @@ def make_wb_bus(prefix, obj, simple=False):
         res['i_%s__%s' % (prefix, i)] = getattr(obj, i)
     return res
 
-def make_wb_slave(prefix, obj):
+def make_wb_slave(prefix, obj, simple=False):
     res = {}
-    for i in ['stb', 'cyc', 'cti', 'bte', 'we', 'adr', 'dat_w', 'sel']:
+    inpins = ['stb', 'cyc', 'we', 'adr', 'dat_w', 'sel']
+    if not simple:
+        inpins += ['cti', 'bte']
+    for i in inpins:
         res['i_%s__%s' % (prefix, i)] = getattr(obj, i)
     for o in ['ack', 'err', 'dat_r']:
         res['o_%s__%s' % (prefix, o)] = getattr(obj, o)
@@ -250,14 +253,19 @@ class LibreSoC(CPU):
             self.cpu_params['o_pll_lck_o'] = self.pll_lck_o
 
         # add wishbone buses to cpu params
-        self.cpu_params.update(make_wb_bus("ibus", ibus))
-        self.cpu_params.update(make_wb_bus("dbus", dbus))
-        self.cpu_params.update(make_wb_slave("ics_wb", ics))
-        self.cpu_params.update(make_wb_slave("icp_wb", icp))
+        self.cpu_params.update(make_wb_bus("ibus", ibus, True))
+        self.cpu_params.update(make_wb_bus("dbus", dbus, True))
+        self.cpu_params.update(make_wb_slave("ics_wb", ics, True))
+        self.cpu_params.update(make_wb_slave("icp_wb", icp, True))
         if "testgpio" in variant:
             self.cpu_params.update(make_wb_slave("gpio_wb", gpio))
         if jtag_en:
             self.cpu_params.update(make_wb_bus("jtag_wb", jtag_wb, simple=True))
+        # and set ibus advanced tags to zero (disable)
+        self.cpu_params['i_ibus__cti'] = 0
+        self.cpu_params['i_ibus__bte'] = 0
+        self.cpu_params['i_dbus__cti'] = 0
+        self.cpu_params['i_dbus__bte'] = 0
 
         if variant == 'ls180':
             # urr yuk.  have to expose iopads / pins from core to litex

diff --git a/src/soc/minerva/wishbone.py b/src/soc/minerva/wishbone.py
index ba08531e84965f785b154674875627c0a3053ffb..f84a01ccc2f3b98f57ffe16c37cb5a2c206cf24b 100644 (file)
--- a/src/soc/minerva/wishbone.py
+++ b/src/soc/minerva/wishbone.py
@@ -14,12 +14,12 @@ class Cycle:
     END       = 7
 
 
-def make_wb_layout(spec):
+def make_wb_layout(spec, cti=True):
     addr_wid, mask_wid, data_wid = spec.addr_wid, spec.mask_wid, spec.reg_wid
     adr_lsbs = log2_int(mask_wid) # LSBs of addr covered by mask
     badwid = spec.addr_wid-adr_lsbs    # MSBs (not covered by mask)
 
-    return [
+    res = [
     ("adr",   badwid  , DIR_FANOUT),
     ("dat_w", data_wid, DIR_FANOUT),
     ("dat_r", data_wid, DIR_FANIN),
@@ -28,10 +28,14 @@ def make_wb_layout(spec):
     ("stb",           1, DIR_FANOUT),
     ("ack",           1, DIR_FANIN),
     ("we",            1, DIR_FANOUT),
-    ("cti",           3, DIR_FANOUT),
-    ("bte",           2, DIR_FANOUT),
     ("err",           1, DIR_FANIN)
     ]
+    if not cti:
+        return res
+    return res + [
+        ("cti",           3, DIR_FANOUT),
+        ("bte",           2, DIR_FANOUT),
+    ]
 
 
 class WishboneArbiter(Elaboratable):