diff --git a/arch/loongarch/include/asm/io.h b/arch/loongarch/include/asm/io.h
index 1c9410220040..0dcb36b32cb2 100644
--- a/arch/loongarch/include/asm/io.h
+++ b/arch/loongarch/include/asm/io.h
@@ -5,8 +5,6 @@
 #ifndef _ASM_IO_H
 #define _ASM_IO_H
 
-#define ARCH_HAS_IOREMAP_WC
-
 #include <linux/kernel.h>
 #include <linux/types.h>
 
diff --git a/arch/m68k/include/asm/io_mm.h b/arch/m68k/include/asm/io_mm.h
index d41fa488453b..6a0abd4846c6 100644
--- a/arch/m68k/include/asm/io_mm.h
+++ b/arch/m68k/include/asm/io_mm.h
@@ -26,8 +26,6 @@
 #include <asm/virtconvert.h>
 #include <asm/kmap.h>
 
-#include <asm-generic/iomap.h>
-
 #ifdef CONFIG_ATARI
 #define atari_readb   raw_inb
 #define atari_writeb  raw_outb
diff --git a/arch/m68k/include/asm/kmap.h b/arch/m68k/include/asm/kmap.h
index dec05743d426..4efb3efa593a 100644
--- a/arch/m68k/include/asm/kmap.h
+++ b/arch/m68k/include/asm/kmap.h
@@ -4,8 +4,6 @@
 
 #ifdef CONFIG_MMU
 
-#define ARCH_HAS_IOREMAP_WT
-
 /* Values for nocacheflag and cmode */
 #define IOMAP_FULL_CACHING		0
 #define IOMAP_NOCACHE_SER		1
diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
index affd21e9c20b..062dd4e6b954 100644
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -12,8 +12,6 @@
 #ifndef _ASM_IO_H
 #define _ASM_IO_H
 
-#define ARCH_HAS_IOREMAP_WC
-
 #include <linux/compiler.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
@@ -25,7 +23,6 @@
 #include <asm/byteorder.h>
 #include <asm/cpu.h>
 #include <asm/cpu-features.h>
-#include <asm-generic/iomap.h>
 #include <asm/page.h>
 #include <asm/pgtable-bits.h>
 #include <asm/processor.h>
@@ -210,6 +207,8 @@ void iounmap(const volatile void __iomem *addr);
 #define ioremap_wc(offset, size)					\
 	ioremap_prot((offset), (size), boot_cpu_data.writecombine)
 
+#include <asm-generic/iomap.h>
+
 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
 #define war_io_reorder_wmb()		wmb()
 #else
diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h
index f1e657c9bbe8..67a3fb6de498 100644
--- a/arch/powerpc/include/asm/io.h
+++ b/arch/powerpc/include/asm/io.h
@@ -3,11 +3,6 @@
 #define _ASM_POWERPC_IO_H
 #ifdef __KERNEL__
 
-#define ARCH_HAS_IOREMAP_WC
-#ifdef CONFIG_PPC32
-#define ARCH_HAS_IOREMAP_WT
-#endif
-
 /*
  */
 
@@ -732,9 +727,7 @@ static inline void name at					\
 #define writel_relaxed(v, addr)	writel(v, addr)
 #define writeq_relaxed(v, addr)	writeq(v, addr)
 
-#ifdef CONFIG_GENERIC_IOMAP
-#include <asm-generic/iomap.h>
-#else
+#ifndef CONFIG_GENERIC_IOMAP
 /*
  * Here comes the implementation of the IOMAP interfaces.
  */
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index e9025640f634..76238842406a 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -35,9 +35,6 @@
   *  - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
   */
 
-#define ARCH_HAS_IOREMAP_WC
-#define ARCH_HAS_IOREMAP_WT
-
 #include <linux/string.h>
 #include <linux/compiler.h>
 #include <linux/cc_platform.h>
@@ -212,8 +209,6 @@ void memset_io(volatile void __iomem *, int, size_t);
 #define memcpy_toio memcpy_toio
 #define memset_io memset_io
 
-#include <asm-generic/iomap.h>
-
 /*
  * ISA space is 'always mapped' on a typical x86 system, no need to
  * explicitly ioremap() it. The fact that the ISA IO space is mapped
diff --git a/drivers/net/ethernet/sfc/io.h b/drivers/net/ethernet/sfc/io.h
index 30439cc83a89..07f99ad14bf3 100644
--- a/drivers/net/ethernet/sfc/io.h
+++ b/drivers/net/ethernet/sfc/io.h
@@ -70,7 +70,7 @@
  */
 #ifdef CONFIG_X86_64
 /* PIO is a win only if write-combining is possible */
-#ifdef ARCH_HAS_IOREMAP_WC
+#ifdef ioremap_wc
 #define EFX_USE_PIO 1
 #endif
 #endif
diff --git a/drivers/net/ethernet/sfc/siena/io.h b/drivers/net/ethernet/sfc/siena/io.h
index 30439cc83a89..07f99ad14bf3 100644
--- a/drivers/net/ethernet/sfc/siena/io.h
+++ b/drivers/net/ethernet/sfc/siena/io.h
@@ -70,7 +70,7 @@
  */
 #ifdef CONFIG_X86_64
 /* PIO is a win only if write-combining is possible */
-#ifdef ARCH_HAS_IOREMAP_WC
+#ifdef ioremap_wc
 #define EFX_USE_PIO 1
 #endif
 #endif
diff --git a/include/asm-generic/iomap.h b/include/asm-generic/iomap.h
index 08237ae8b840..196087a8126e 100644
--- a/include/asm-generic/iomap.h
+++ b/include/asm-generic/iomap.h
@@ -93,15 +93,15 @@ extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
 extern void ioport_unmap(void __iomem *);
 #endif
 
-#ifndef ARCH_HAS_IOREMAP_WC
+#ifndef ioremap_wc
 #define ioremap_wc ioremap
 #endif
 
-#ifndef ARCH_HAS_IOREMAP_WT
+#ifndef ioremap_wt
 #define ioremap_wt ioremap
 #endif
 
-#ifndef ARCH_HAS_IOREMAP_NP
+#ifndef ioremap_np
 /* See the comment in asm-generic/io.h about ioremap_np(). */
 #define ioremap_np ioremap_np
 static inline void __iomem *ioremap_np(phys_addr_t offset, size_t size)