public inbox for u-boot@lists.denx.de
 help / color / mirror / Atom feed
From: Daniel Palmer <daniel@thingy.jp>
To: visitorckw@gmail.com, angelo@kernel-space.org, bmeng.cn@gmail.com
Cc: u-boot@lists.denx.de, Daniel Palmer <daniel@thingy.jp>
Subject: [PATCH v2 2/5] m68k: Fix writew(), writel(), readw(), readl() endianness
Date: Mon,  6 Apr 2026 23:24:08 +0900	[thread overview]
Message-ID: <20260406142411.2992618-3-daniel@thingy.jp> (raw)
In-Reply-To: <20260406142411.2992618-1-daniel@thingy.jp>

In Linux these are meant to read a little-endian value and swap
to the CPU endian.

In u-boot for m68k this is currently borken and prevents
virtio-mmio from functioning.

Signed-off-by: Daniel Palmer <daniel@thingy.jp>
---
 arch/m68k/include/asm/io.h | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/arch/m68k/include/asm/io.h b/arch/m68k/include/asm/io.h
index 35ad4a1c0444..f4877b0446cf 100644
--- a/arch/m68k/include/asm/io.h
+++ b/arch/m68k/include/asm/io.h
@@ -24,18 +24,11 @@
 #define __raw_writel(l,addr) ((*(volatile u32 *) (addr)) = (l))
 
 #define readb(addr)		in_8((volatile u8 *)(addr))
-#define writeb(b,addr)		out_8((volatile u8 *)(addr), (b))
-#if !defined(__BIG_ENDIAN)
-#define readw(addr)		(*(volatile u16 *) (addr))
-#define readl(addr)		(*(volatile u32 *) (addr))
-#define writew(b,addr)		((*(volatile u16 *) (addr)) = (b))
-#define writel(b,addr)		((*(volatile u32 *) (addr)) = (b))
-#else
-#define readw(addr)		in_be16((volatile u16 *)(addr))
-#define readl(addr)		in_be32((volatile u32 *)(addr))
-#define writew(b,addr)		out_be16((volatile u16 *)(addr),(b))
-#define writel(b,addr)		out_be32((volatile u32 *)(addr),(b))
-#endif
+#define writeb(b, addr)		out_8((volatile u8 *)(addr), (b))
+#define readw(addr)		in_le16((volatile u16 *)(addr))
+#define readl(addr)		in_le32((volatile u32 *)(addr))
+#define writew(b, addr)		out_le16((volatile u16 *)(addr), (b))
+#define writel(b, addr)		out_le32((volatile u32 *)(addr), (b))
 
 /*
  * The insw/outsw/insl/outsl macros don't do byte-swapping.
-- 
2.51.0


  parent reply	other threads:[~2026-04-06 14:24 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-04-06 14:24 [PATCH v2 0/5] Add virtio-mmio support to m68k virt machine Daniel Palmer
2026-04-06 14:24 ` [PATCH v2 1/5] sysreset: qemu virt: Use __raw_writel() Daniel Palmer
2026-04-06 16:57   ` Kuan-Wei Chiu
2026-04-08 12:15   ` Angelo Dureghello
2026-04-06 14:24 ` Daniel Palmer [this message]
2026-04-06 17:15   ` [PATCH v2 2/5] m68k: Fix writew(), writel(), readw(), readl() endianness Kuan-Wei Chiu
2026-04-07  0:58     ` Daniel Palmer
2026-04-08 12:12   ` Angelo Dureghello
2026-04-08 12:49     ` Daniel Palmer
2026-04-08 13:26       ` Angelo Dureghello
2026-04-08 13:40         ` Daniel Palmer
2026-04-08 14:18           ` Angelo Dureghello
2026-04-06 14:24 ` [PATCH v2 3/5] virtio: mmio: Keep vendor id little endian Daniel Palmer
2026-04-06 16:54   ` Kuan-Wei Chiu
2026-04-07  1:00     ` Daniel Palmer
2026-04-07  8:20     ` Daniel Palmer
2026-04-06 14:24 ` [PATCH v2 4/5] virtio: mmio: Allow instantiation via platform data Daniel Palmer
2026-04-08  1:47   ` Kuan-Wei Chiu
2026-04-08  9:39     ` Daniel Palmer
2026-04-06 14:24 ` [PATCH v2 5/5] board: qemu: m68k: Create virtio mmio instances Daniel Palmer

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20260406142411.2992618-3-daniel@thingy.jp \
    --to=daniel@thingy.jp \
    --cc=angelo@kernel-space.org \
    --cc=bmeng.cn@gmail.com \
    --cc=u-boot@lists.denx.de \
    --cc=visitorckw@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox