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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sh/lib/io.c
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// SPDX-License-Identifier: GPL-2.0

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/*

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 * arch/sh/lib/io.c - SH32 optimized I/O routines

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 *

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 * Copyright (C) 2000  Stuart Menefy

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 * Copyright (C) 2005  Paul Mundt

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 *

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 * Provide real functions which expand to whatever the header file defined.

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 * Also definitions of machine independent IO functions.

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 */

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#include <linux/module.h>

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#include <linux/io.h>

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void __raw_readsl(const volatile void __iomem *addr, void *datap, int len)

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{

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	u32 *data;

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	for (data = datap; (len != 0) && (((u32)data & 0x1f) != 0); len--)

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		*data++ = __raw_readl(addr);

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	if (likely(len >= (0x20 >> 2))) {

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		int tmp2, tmp3, tmp4, tmp5, tmp6;

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		__asm__ __volatile__(

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			"1:			\n\t"

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			"mov.l	@%7, r0		\n\t"

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			"mov.l	@%7, %2		\n\t"

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#ifdef CONFIG_CPU_SH4

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			"movca.l r0, @%0	\n\t"

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#else

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			"mov.l	r0, @%0		\n\t"

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#endif

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			"mov.l	@%7, %3		\n\t"

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			"mov.l	@%7, %4		\n\t"

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			"mov.l	@%7, %5		\n\t"

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			"mov.l	@%7, %6		\n\t"

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			"mov.l	@%7, r7		\n\t"

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			"mov.l	@%7, r0		\n\t"

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			"mov.l	%2, @(0x04,%0)	\n\t"

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			"mov	#0x20>>2, %2	\n\t"

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			"mov.l	%3, @(0x08,%0)	\n\t"

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			"sub	%2, %1		\n\t"

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			"mov.l	%4, @(0x0c,%0)	\n\t"

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			"cmp/hi	%1, %2		! T if 32 > len	\n\t"

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			"mov.l	%5, @(0x10,%0)	\n\t"

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			"mov.l	%6, @(0x14,%0)	\n\t"

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			"mov.l	r7, @(0x18,%0)	\n\t"

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			"mov.l	r0, @(0x1c,%0)	\n\t"

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			"bf.s	1b		\n\t"

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			" add	#0x20, %0	\n\t"

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			: "=&r" (data), "=&r" (len),

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			  "=&r" (tmp2), "=&r" (tmp3), "=&r" (tmp4),

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			  "=&r" (tmp5), "=&r" (tmp6)

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			: "r"(addr), "0" (data), "1" (len)

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			: "r0", "r7", "t", "memory");

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	}

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	for (; len != 0; len--)

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		*data++ = __raw_readl(addr);

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}

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EXPORT_SYMBOL(__raw_readsl);

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void __raw_writesl(volatile void __iomem *addr, const void *data, int len)

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{

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	if (likely(len != 0)) {

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		int tmp1;

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		__asm__ __volatile__ (

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			"1:				\n\t"

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			"mov.l	@%0+, %1	\n\t"

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			"dt		%3		\n\t"

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			"bf.s		1b		\n\t"

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			" mov.l	%1, @%4		\n\t"

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			: "=&r" (data), "=&r" (tmp1)

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			: "0" (data), "r" (len), "r"(addr)

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			: "t", "memory");

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	}

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}

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EXPORT_SYMBOL(__raw_writesl);

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