Hardware/litex
1
0
Fork 0
mirror of https://github.com/enjoy-digital/litex.git synced 2025-01-04 09:52:26 -05:00
Code Issues Projects Releases Packages Wiki Activity

soc/integration/export: Add CSR aliases for devices with suffix zero

Browse source 
The LiteX BIOS checks for the presence of the various CSR_*_BASE
definitions to decide to include device support or not.  E.g. for I2C,
it checks for CSR_I2C_BASE.

However, linux-on-litex-vexriscv registers I2C masters using "i2c0"
instead of "i2c", in anticipation for future support for multiple I2C
busses.  As a consequence, CSR_I2C0_BASE is defined instead of
CSR_I2C_BASE, and LiteX BIOS is built without support for I2C.

Fix this by creating aliases for devices with suffix zero in the
generated CSR register definitions, so the LiteX BIOS will pick up the
presence of the corresponding device, and include support for it.

For now this is limited to the first instance of each type.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Geert Uytterhoeven 2021-01-15 15:15:42 +01:00
parent b1cad93e62
commit b0e05b4533
1 changed files with 28 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

28
litex/soc/integration/export.py
View file

@ -19,6 +19,7 @@
import os
import json
import inspect
import re
from shutil import which
from sysconfig import get_platform
@ -258,6 +259,33 @@ def get_csr_header(regions, constants, csr_base=None, with_access_functions=True
r += "\t" + reg_name + "_write(newword);\n"
r += "}\n"
# Create alias for device with suffix zero
if re.fullmatch(".*[^\d]0", name):
alias = name[:-1]
r += "/* "+alias+" aliases */\n"
r += "#define CSR_{}_BASE CSR_{}_BASE\n".format(alias.upper(), name.upper())
for csr in region.obj:
reg_name = name + "_" + csr.name
alias_reg_name = alias + "_" + csr.name
r += "#define CSR_{}_ADDR CSR_{}_ADDR\n".format(alias_reg_name.upper(), reg_name.upper())
r += "#define CSR_{}_SIZE CSR_{}_SIZE\n".format(alias_reg_name.upper(), reg_name.upper())
if with_access_functions:
r += "#define {}_read {}_read\n".format(alias_reg_name, reg_name)
if not getattr(csr, "read_only", False):
r += "#define {}_write {}_write\n".format(alias_reg_name, reg_name)
if hasattr(csr, "fields"):
for field in csr.fields.fields:
field_name = name + "_" + csr.name + "_" + field.name
alias_field_name = alias + "_" + csr.name + "_" + field.name
r += "#define CSR_{}_OFFSET CSR_{}_OFFSET\n".format(alias_field_name.upper(), field_name.upper())
r += "#define CSR_{}_SIZE CSR_{}_SIZE\n".format(alias_field_name.upper(), field_name.upper())
if with_access_functions:
r += "#define {}_extract {}_extract\n".format(alias_field_name, field_name)
r += "#define {}_read {}_read\n".format(alias_field_name, field_name)
if not getattr(csr, "read_only", False):
r += "#define {}_replace {}_replace\n".format(alias_field_name, field_name)
r += "#define {}_write {}_write\n".format(alias_field_name, field_name)
r += "\n#endif\n"
return r