From: Sebastien Bourdeauducq <sebastien@milkymist.org>
Date: Fri, 2 Aug 2013 21:05:54 +0000 (+0200)
Subject: bank/csrgen: add get_offset function to pre-calculate register addresses
X-Git-Tag: 24jan2021_ls180~2099^2~488
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=0e195da3c0839cbc5e83bfa4391caa3adc65f844;p=litex.git

bank/csrgen: add get_offset function to pre-calculate register addresses
---

diff --git a/migen/bank/csrgen.py b/migen/bank/csrgen.py
index 3624d90d..320b3ec0 100644
--- a/migen/bank/csrgen.py
+++ b/migen/bank/csrgen.py
@@ -4,6 +4,14 @@ from migen.fhdl.std import *
 from migen.bus import csr
 from migen.bank.description import *
 
+def get_offset(description, name, csr_data_width=8):
+	offset = 0
+	for c in description:
+		if c.name == name:
+			return offset
+		offset += (c.size + csr_data_width - 1)//csr_data_width
+	raise KeyError("CSR not found: "+name)
+
 class Bank(Module):
 	def __init__(self, description, address=0, bus=None):
 		if bus is None: