linux-kernel - [PATCH RFC 1/4] arm64: io: Introduce IO_SPACE

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Message-ID: <1610729929-188490-2-git-send-email-john.garry@huawei.com>
Date:   Sat, 16 Jan 2021 00:58:46 +0800
From:   John Garry <john.garry@...wei.com>
To:     <catalin.marinas@....com>, <will@...nel.org>, <arnd@...db.de>,
        <akpm@...ux-foundation.org>, <xuwei5@...ilicon.com>,
        <lorenzo.pieralisi@....com>, <helgaas@...nel.org>,
        <jiaxun.yang@...goat.com>, <song.bao.hua@...ilicon.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-arch@...r.kernel.org>,
        <linux-mips@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linuxarm@...neuler.org>, John Garry <john.garry@...wei.com>
Subject: [PATCH RFC 1/4] arm64: io: Introduce IO_SPACE_BASE

Introduce IO_SPACE_BASE, which is the base address of the IO port region.

0x10000 is chosen intentionally to exclude legacy ISA IO port address
range.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 arch/arm64/include/asm/io.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index fd172c41df90..2bcf55704bee 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -148,6 +148,7 @@ static inline u64 __raw_readq(const volatile void __iomem *addr)
 #define arch_has_dev_port()	(1)
 #define IO_SPACE_LIMIT		(PCI_IO_SIZE - 1)
 #define PCI_IOBASE		((void __iomem *)PCI_IO_START)
+#define IO_SPACE_BASE		(0x10000)
 
 /*
  * String version of I/O memory access operations.
-- 
2.26.2