litex/miscope/std/cif.py

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2013-09-21 07:04:07 -04:00
from operator import itemgetter
import re
from migen.fhdl.std import *
from migen.bank.description import CSRStatus
def get_macros(filename):
f = open(filename, "r")
r = {}
for line in f:
match = re.match("\w*#define\s+(\w+)\s+(.*)", line, re.IGNORECASE)
if match:
r[match.group(1)] = match.group(2)
return r
def _get_rw_functions(reg_name, reg_base, size, read_only):
r = ""
if size > 8:
raise NotImplementedError("Register too large")
elif size > 4:
ctype = "unsigned long long int"
elif size > 2:
ctype = "unsigned int"
elif size > 1:
ctype = "unsigned short int"
else:
ctype = "unsigned char"
r += "static inline "+ctype+" "+reg_name+"_read(void) {\n"
if size > 1:
r += "\t"+ctype+" r = MMPTR("+hex(reg_base)+");\n"
for byte in range(1, size):
r += "\tr <<= 8;\n\tr |= MMPTR("+hex(reg_base+4*byte)+");\n"
r += "\treturn r;\n}\n"
else:
r += "\treturn MMPTR("+hex(reg_base)+");\n}\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):
r = "#ifndef __HW_CSR_H\n#define __HW_CSR_H\n#include <hw/common.h>\n"
for name, csrs, mapaddr, rmap in bank_array.banks:
r += "\n/* "+name+" */\n"
reg_base = csr_base + 0x800*mapaddr
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, isinstance(csr, CSRStatus))
reg_base += 4*nr
r += "\n#endif\n"
return r
def _get_py_rw_functions(reg_name, reg_base, size):
r = ""
r += "def "+reg_name+"_read(bus):\n"
r += "\tr = bus.read_csr("+hex(reg_base)+")\n"
for byte in range(1, size):
r += "\tr <<= 8\n\tr |= bus.read_csr("+hex(reg_base+4*byte)+")\n"
r += "\treturn r\n\n"
r += "def "+reg_name+"_write(bus, value):\n"
for byte in range(size):
shift = (size-byte-1)*8
if shift:
value_shifted = "value >> "+str(shift)
else:
value_shifted = "value"
r += "\tbus.write_csr("+hex(reg_base+4*byte)+", ("+value_shifted+")&0xff)\n"
r += "\n"
return r
def get_py_csr_header(csr_base, bank_array):
r = ""
for name, csrs, mapaddr, rmap in bank_array.banks:
r += "\n# "+name+"\n"
reg_base = csr_base + 0x800*mapaddr
r += name.upper()+"_BASE ="+hex(reg_base)+"\n"
for csr in csrs:
nr = (csr.size + 7)//8
r += _get_py_rw_functions(name + "_" + csr.name, reg_base, nr)
reg_base += 4*nr
return r