linux-kernel - [PATCH 01/20] staging: comedi: plx9080.h: correct LRNG_IO_MASK and LMAP_IO

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Message-Id: <1463752162-15181-2-git-send-email-abbotti@mev.co.uk>
Date:	Fri, 20 May 2016 14:49:03 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	devel@...verdev.osuosl.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ian Abbott <abbotti@....co.uk>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 01/20] staging: comedi: plx9080.h: correct LRNG_IO_MASK and LMAP_IO_MASK

For the PLX local address space range registers, LAS0RR and LAS1RR, bit
0 indicates whether the local address space will be mapped to memory
space or I/O space.  If mapped to I/O space, bit 1 must be set to 0, and
bits 31 to 2 form the address decoding mask, which should be -2^N mod
2^32 for a range of length 2^N.

The `LRNG_IO_MASK` macro is supposed to specify the address decoding
bits for I/O space.  It currently has the value `0xfffffffa`, but should
be `0xfffffffc`, or possibly `0xfffffffe` (it doesn't really matter,
since bit 1 is required to be set to 0).  Change it to `0xfffffffc`.

Similarly, for the PLX local address space local base address (remap)
registers, LAS0BA and LAS1BA, bits 31 to 2, masked with the
corresponding "range" register form the local base address for the local
address space.  The `LMAP_IO_MASK` macro is supposed to mask the valid
bits for I/O space.  Change its value from `0xfffffffa` to `0xfffffffc`
to match `LRNG_IO_MASK`.

Signed-off-by: Ian Abbott <abbotti@....co.uk>
---
 drivers/staging/comedi/drivers/plx9080.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/comedi/drivers/plx9080.h b/drivers/staging/comedi/drivers/plx9080.h
index 8d1aee00b1..7d6311c 100644
--- a/drivers/staging/comedi/drivers/plx9080.h
+++ b/drivers/staging/comedi/drivers/plx9080.h
@@ -60,7 +60,7 @@ struct plx_dma_desc {
 /*  bits that specify range for memory io */
 #define  LRNG_MEM_MASK     0xfffffff0
 /*  bits that specify range for normal io */
-#define  LRNG_IO_MASK     0xfffffffa
+#define  LRNG_IO_MASK     0xfffffffc
 /* L, Local Addr Space 0 Remap Register */
 #define PLX_LAS0MAP_REG         0x0004
 /* L, Local Addr Space 1 Remap Register */
@@ -69,7 +69,7 @@ struct plx_dma_desc {
 /*  bits that specify decode for memory io */
 #define  LMAP_MEM_MASK     0xfffffff0
 /*  bits that specify decode bits for normal io */
-#define  LMAP_IO_MASK     0xfffffffa
+#define  LMAP_IO_MASK     0xfffffffc

 /*
  * Mode/Arbitration Register.
-- 
2.8.1