cif: do not generate write function for CSRStatus

diff --git a/cif.py b/cif.py
index a8aca1877b6c867620fc7b97b0d1abe3e7db3cd4..ace7b2af0ae951477a7898f0a34ec142388252e9 100644 (file)
--- a/cif.py
+++ b/cif.py
@@ -1,6 +1,8 @@
 from operator import itemgetter
 import re
 
+from migen.bank.description import CSRStatus
+
 def get_macros(filename):
        f = open(filename, "r")
        r = {}
@@ -10,7 +12,7 @@ def get_macros(filename):
                        r[match.group(1)] = match.group(2)
        return r
 
-def _get_rw_functions(reg_name, reg_base, size):
+def _get_rw_functions(reg_name, reg_base, size, read_only):
        r = ""
        if size > 8:
                raise NotImplementedError("Register too large")
@@ -32,15 +34,16 @@ def _get_rw_functions(reg_name, reg_base, size):
        else:
                r += "\treturn MMPTR("+hex(reg_base)+");\n}\n"
 
-       r += "static inline void "+reg_name+"_write("+ctype+" value) {\n"
-       for byte in range(size):
-               shift = (size-byte-1)*8
-               if shift:
-                       value_shifted = "value >> "+str(shift)
-               else:
-                       value_shifted = "value"
-               r += "\tMMPTR("+hex(reg_base+4*byte)+") = "+value_shifted+";\n"
-       r += "}\n"
+       if not read_only:
+               r += "static inline void "+reg_name+"_write("+ctype+" value) {\n"
+               for byte in range(size):
+                       shift = (size-byte-1)*8
+                       if shift:
+                               value_shifted = "value >> "+str(shift)
+                       else:
+                               value_shifted = "value"
+                       r += "\tMMPTR("+hex(reg_base+4*byte)+") = "+value_shifted+";\n"
+               r += "}\n"
        return r
 
 def get_csr_header(csr_base, bank_array, interrupt_map):
@@ -51,7 +54,7 @@ def get_csr_header(csr_base, bank_array, interrupt_map):
                r += "#define "+name.upper()+"_BASE "+hex(reg_base)+"\n"
                for csr in csrs:
                        nr = (csr.size + 7)//8
-                       r += _get_rw_functions(name + "_" + csr.name, reg_base, nr)
+                       r += _get_rw_functions(name + "_" + csr.name, reg_base, nr, isinstance(csr, CSRStatus))
                        reg_base += 4*nr
                try:
                        interrupt_nr = interrupt_map[name]