[PATCH v2] sh: Remove IO memcpy and memset from sh code

[Julian Vetter <julian@outer-limits.org>]

Remove IO memcpy and memset from sh specific code and fall back to the
new implementations from lib/iomem_copy.c. They use word accesses if the
buffers are aligned and only fall back to byte accesses for potentially
unaligned parts of a buffer.

Signed-off-by: Julian Vetter <julian@outer-limits.org>
---
Changes for V2:
- Removed also SH4 specific memcpy_fromio code
---
 arch/sh/include/asm/io.h |   8 ---
 arch/sh/kernel/io.c      | 111 ---------------------------------------
 2 files changed, 119 deletions(-)
 delete mode 100644 arch/sh/kernel/io.c

diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
index cf5eab840d57..1e33a1c8b72d 100644
--- a/arch/sh/include/asm/io.h
+++ b/arch/sh/include/asm/io.h
@@ -268,14 +268,6 @@ __BUILD_IOPORT_STRING(q, u64)
 
 #define IO_SPACE_LIMIT 0xffffffff
 
-/* We really want to try and get these to memcpy etc */
-#define memset_io memset_io
-#define memcpy_fromio memcpy_fromio
-#define memcpy_toio memcpy_toio
-void memcpy_fromio(void *, const volatile void __iomem *, unsigned long);
-void memcpy_toio(volatile void __iomem *, const void *, unsigned long);
-void memset_io(volatile void __iomem *, int, unsigned long);
-
 /* Quad-word real-mode I/O, don't ask.. */
 unsigned long long peek_real_address_q(unsigned long long addr);
 unsigned long long poke_real_address_q(unsigned long long addr,
diff --git a/arch/sh/kernel/io.c b/arch/sh/kernel/io.c
deleted file mode 100644
index da22f3b32d30..000000000000
--- a/arch/sh/kernel/io.c
+++ /dev/null
@@ -1,111 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * arch/sh/kernel/io.c - Machine independent I/O functions.
- *
- * Copyright (C) 2000 - 2009  Stuart Menefy
- * Copyright (C) 2005  Paul Mundt
- */
-#include <linux/module.h>
-#include <linux/pci.h>
-#include <asm/machvec.h>
-#include <asm/io.h>
-
-/*
- * Copy data from IO memory space to "real" memory space.
- */
-void memcpy_fromio(void *to, const volatile void __iomem *from, unsigned long count)
-{
-	/*
-	 * Would it be worthwhile doing byte and long transfers first
-	 * to try and get aligned?
-	 */
-#ifdef CONFIG_CPU_SH4
-	if ((count >= 0x20) &&
-	     (((u32)to & 0x1f) == 0) && (((u32)from & 0x3) == 0)) {
-		int tmp2, tmp3, tmp4, tmp5, tmp6;
-
-		__asm__ __volatile__(
-			"1:			\n\t"
-			"mov.l	@%7+, r0	\n\t"
-			"mov.l	@%7+, %2	\n\t"
-			"movca.l r0, @%0	\n\t"
-			"mov.l	@%7+, %3	\n\t"
-			"mov.l	@%7+, %4	\n\t"
-			"mov.l	@%7+, %5	\n\t"
-			"mov.l	@%7+, %6	\n\t"
-			"mov.l	@%7+, r7	\n\t"
-			"mov.l	@%7+, r0	\n\t"
-			"mov.l	%2, @(0x04,%0)	\n\t"
-			"mov	#0x20, %2	\n\t"
-			"mov.l	%3, @(0x08,%0)	\n\t"
-			"sub	%2, %1		\n\t"
-			"mov.l	%4, @(0x0c,%0)	\n\t"
-			"cmp/hi	%1, %2		! T if 32 > count	\n\t"
-			"mov.l	%5, @(0x10,%0)	\n\t"
-			"mov.l	%6, @(0x14,%0)	\n\t"
-			"mov.l	r7, @(0x18,%0)	\n\t"
-			"mov.l	r0, @(0x1c,%0)	\n\t"
-			"bf.s	1b		\n\t"
-			" add	#0x20, %0	\n\t"
-			: "=&r" (to), "=&r" (count),
-			  "=&r" (tmp2), "=&r" (tmp3), "=&r" (tmp4),
-			  "=&r" (tmp5), "=&r" (tmp6), "=&r" (from)
-			: "7"(from), "0" (to), "1" (count)
-			: "r0", "r7", "t", "memory");
-	}
-#endif
-
-	if ((((u32)to | (u32)from) & 0x3) == 0) {
-		for (; count > 3; count -= 4) {
-			*(u32 *)to = *(volatile u32 *)from;
-			to += 4;
-			from += 4;
-		}
-	}
-
-	for (; count > 0; count--) {
-		*(u8 *)to = *(volatile u8 *)from;
-		to++;
-		from++;
-	}
-
-	mb();
-}
-EXPORT_SYMBOL(memcpy_fromio);
-
-/*
- * Copy data from "real" memory space to IO memory space.
- */
-void memcpy_toio(volatile void __iomem *to, const void *from, unsigned long count)
-{
-	if ((((u32)to | (u32)from) & 0x3) == 0) {
-		for ( ; count > 3; count -= 4) {
-			*(volatile u32 *)to = *(u32 *)from;
-			to += 4;
-			from += 4;
-		}
-	}
-
-	for (; count > 0; count--) {
-		*(volatile u8 *)to = *(u8 *)from;
-		to++;
-		from++;
-	}
-
-	mb();
-}
-EXPORT_SYMBOL(memcpy_toio);
-
-/*
- * "memset" on IO memory space.
- * This needs to be optimized.
- */
-void memset_io(volatile void __iomem *dst, int c, unsigned long count)
-{
-        while (count) {
-                count--;
-                writeb(c, dst);
-                dst++;
-        }
-}
-EXPORT_SYMBOL(memset_io);
-- 
2.34.1