From: Greg Davill <greg.davill@gmail.com>
Date: Thu, 9 Jan 2020 11:23:00 +0000 (+1030)
Subject: soc/cores/spi_flash: Don't tristate DQ2/DQ3 when bitbanging
X-Git-Tag: 24jan2021_ls180~767^2
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=49781467d7f6645ef9884bf644b25cec47ef9c6f;p=litex.git

soc/cores/spi_flash: Don't tristate DQ2/DQ3 when bitbanging
---

diff --git a/litex/soc/cores/spi_flash.py b/litex/soc/cores/spi_flash.py
index e584df9f..3b7330a9 100644
--- a/litex/soc/cores/spi_flash.py
+++ b/litex/soc/cores/spi_flash.py
@@ -8,6 +8,7 @@
 
 from migen import *
 from migen.genlib.misc import timeline
+from migen.fhdl.specials import Tristate
 
 from litex.gen import *
 
@@ -117,7 +118,11 @@ class SpiFlashDualQuad(SpiFlashCommon, AutoCSR):
         addr_width = 24
 
         dq = TSTriple(spi_width)
-        self.specials.dq = dq.get_tristate(pads.dq)
+        # Keep DQ2,DQ3 as outputs during bitbang, this ensures they activate ~WP or ~HOLD functions
+        self.specials.dq0 = Tristate(pads.dq[0], o=dq.o[0], i=dq.i[0], oe=dq.oe)
+        self.specials.dq1 = Tristate(pads.dq[1], o=dq.o[1], i=dq.i[1], oe=dq.oe)
+        self.specials.dq2 = Tristate(pads.dq[2], o=dq.o[2], i=dq.i[2], oe=(dq.oe | self.bitbang_en.storage))
+        self.specials.dq3 = Tristate(pads.dq[3], o=dq.o[3], i=dq.i[3], oe=(dq.oe | self.bitbang_en.storage))
 
         sr = Signal(max(cmd_width, addr_width, wbone_width))
         if endianness == "big":