linux-kernel - [PATCH 06/11] io: move PIO

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Message-ID: <20250509031524.2604087-7-andrewjballance@gmail.com>
Date: Thu,  8 May 2025 22:15:19 -0500
From: Andrew Ballance <andrewjballance@...il.com>
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Subject: [PATCH 06/11] io: move PIO_OFFSET to linux/io.h

From: Fiona Behrens <me@...enk.dev>

Move the non arch specific PIO size to linux/io.h.

This allows rust to access `PIO_OFFSET`, `PIO_MASK` and
`PIO_RESERVED`. This is required to implement `IO_COND` in rust.

Signed-off-by: Fiona Behrens <me@...enk.dev>
Signed-off-by: Andrew Ballance <andrewjballance@...il.com>
---
 include/linux/io.h | 13 +++++++++++++
 lib/iomap.c        | 13 -------------
 2 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/include/linux/io.h b/include/linux/io.h
index 6a6bc4d46d0a..df032061544a 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -12,6 +12,19 @@
 #include <asm/io.h>
 #include <asm/page.h>
 
+#ifndef HAVE_ARCH_PIO_SIZE
+/*
+ * We encode the physical PIO addresses (0-0xffff) into the
+ * pointer by offsetting them with a constant (0x10000) and
+ * assuming that all the low addresses are always PIO. That means
+ * we can do some sanity checks on the low bits, and don't
+ * need to just take things for granted.
+ */
+#define PIO_OFFSET	0x10000UL
+#define PIO_MASK	0x0ffffUL
+#define PIO_RESERVED	0x40000UL
+#endif
+
 struct device;
 
 #ifndef __iowrite32_copy
diff --git a/lib/iomap.c b/lib/iomap.c
index a65717cd86f7..e13cfe77c32f 100644
--- a/lib/iomap.c
+++ b/lib/iomap.c
@@ -24,19 +24,6 @@
  * implementation and should do their own copy.
  */
 
-#ifndef HAVE_ARCH_PIO_SIZE
-/*
- * We encode the physical PIO addresses (0-0xffff) into the
- * pointer by offsetting them with a constant (0x10000) and
- * assuming that all the low addresses are always PIO. That means
- * we can do some sanity checks on the low bits, and don't
- * need to just take things for granted.
- */
-#define PIO_OFFSET	0x10000UL
-#define PIO_MASK	0x0ffffUL
-#define PIO_RESERVED	0x40000UL
-#endif
-
 static void bad_io_access(unsigned long port, const char *access)
 {
 	static int count = 10;
-- 
2.49.0