linux-kernel - [PATCH v3 1/3] sparc: explicitly set PCI

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Message-Id: <20210421111759.2059976-2-schnelle@linux.ibm.com>
Date:   Wed, 21 Apr 2021 13:17:57 +0200
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     Arnd Bergmann <arnd@...db.de>, Vineet Gupta <vgupta@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-snps-arc@...ts.infradead.org, sparclinux@...r.kernel.org
Subject: [PATCH v3 1/3] sparc: explicitly set PCI_IOBASE to 0

Instead of relying on the fallback in asm-generic/io.h which sets
PCI_IOBASE 0 if it is not defined set it explicitly.

Link: https://lore.kernel.org/lkml/CAK8P3a3PK9zyeP4ymELtc2ZYnymECoACiigw9Za+pvSJpCk5=g@mail.gmail.com/
Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
---
v1 -> v2:
- Improved comment (David Laight)

 arch/sparc/include/asm/io.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/sparc/include/asm/io.h b/arch/sparc/include/asm/io.h
index 2eefa526b38f..c019e50702c1 100644
--- a/arch/sparc/include/asm/io.h
+++ b/arch/sparc/include/asm/io.h
@@ -1,6 +1,14 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef ___ASM_SPARC_IO_H
 #define ___ASM_SPARC_IO_H
+
+/*
+ * On LEON PCI addresses below 64k are converted to IO accesses.
+ * io_remap_xxx() returns a kernel virtual address in the PCI window so
+ * inb() doesn't need to add an offset.
+ */
+#define PCI_IOBASE ((void __iomem *)0)
+
 #if defined(__sparc__) && defined(__arch64__)
 #include <asm/io_64.h>
 #else
-- 
2.25.1