linux_kernel/arch/arm/mach-s3c24xx/include/mach/io.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * arch/arm/mach-s3c2410/include/mach/io.h
 *  from arch/arm/mach-rpc/include/mach/io.h
 *
 * Copyright (C) 1997 Russell King
 *	     (C) 2003 Simtec Electronics
*/

#ifndef __ASM_ARM_ARCH_IO_H
#define __ASM_ARM_ARCH_IO_H

#include <mach/hardware.h>

#define IO_SPACE_LIMIT 0xffffffff

/*
 * We use two different types of addressing - PC style addresses, and ARM
 * addresses.  PC style accesses the PC hardware with the normal PC IO
 * addresses, eg 0x3f8 for serial#1.  ARM addresses are above A28
 * and are translated to the start of IO.  Note that all addresses are
 * not shifted left!
 */

#define __PORT_PCIO(x)	((x) < (1<<28))

#define PCIO_BASE	 (S3C24XX_VA_ISA_WORD)
#define PCIO_BASE_b	 (S3C24XX_VA_ISA_BYTE)
#define PCIO_BASE_w	 (S3C24XX_VA_ISA_WORD)
#define PCIO_BASE_l	 (S3C24XX_VA_ISA_WORD)
/*
 * Dynamic IO functions - let the compiler
 * optimize the expressions
 */

#define DECLARE_DYN_OUT(sz,fnsuffix,instr) \
static inline void __out##fnsuffix (unsigned int val, unsigned int port) \
{ \
	unsigned long temp;				      \
	__asm__ __volatile__(				      \
	"cmp	%2, #(1<<28)\n\t"			      \
	"mov	%0, %2\n\t"				      \
	"addcc	%0, %0, %3\n\t"				      \
	"str" instr " %1, [%0, #0 ]	@ out" #fnsuffix      \
	: "=&r" (temp)					      \
	: "r" (val), "r" (port), "Ir" (PCIO_BASE_##fnsuffix)  \
	: "cc");					      \
}


#define DECLARE_DYN_IN(sz,fnsuffix,instr)				\
static inline unsigned sz __in##fnsuffix (unsigned int port)		\
{									\
	unsigned long temp, value;					\
	__asm__ __volatile__(						\
	"cmp	%2, #(1<<28)\n\t"					\
	"mov	%0, %2\n\t"						\
	"addcc	%0, %0, %3\n\t"						\
	"ldr" instr "	%1, [%0, #0 ]	@ in" #fnsuffix		\
	: "=&r" (temp), "=r" (value)					\
	: "r" (port), "Ir" (PCIO_BASE_##fnsuffix)	\
	: "cc");							\
	return (unsigned sz)value;					\
}

static inline void __iomem *__ioaddr (unsigned long port)
{
	return __PORT_PCIO(port) ? (PCIO_BASE + port) : (void __iomem *)port;
}

#define DECLARE_IO(sz,fnsuffix,instr)	\
	DECLARE_DYN_IN(sz,fnsuffix,instr) \
	DECLARE_DYN_OUT(sz,fnsuffix,instr)

DECLARE_IO(char,b,"b")
DECLARE_IO(short,w,"h")
DECLARE_IO(int,l,"")

#undef DECLARE_IO
#undef DECLARE_DYN_IN

/*
 * Constant address IO functions
 *
 * These have to be macros for the 'J' constraint to work -
 * +/-4096 immediate operand.
 */
#define __outbc(value,port)						\
({									\
	if (__PORT_PCIO((port)))					\
		__asm__ __volatile__(					\
		"strb	%0, [%1, %2]	@ outbc"			\
		: : "r" (value), "r" (PCIO_BASE), "Jr" ((port)));	\
	else								\
		__asm__ __volatile__(					\
		"strb	%0, [%1, #0]	@ outbc"			\
		: : "r" (value), "r" ((port)));				\
})

#define __inbc(port)							\
({									\
	unsigned char result;						\
	if (__PORT_PCIO((port)))					\
		__asm__ __volatile__(					\
		"ldrb	%0, [%1, %2]	@ inbc"				\
		: "=r" (result) : "r" (PCIO_BASE), "Jr" ((port)));	\
	else								\
		__asm__ __volatile__(					\
		"ldrb	%0, [%1, #0]	@ inbc"				\
		: "=r" (result) : "r" ((port)));			\
	result;								\
})

#define __outwc(value,port)						\
({									\
	unsigned long v = value;					\
	if (__PORT_PCIO((port))) {					\
		if ((port) < 256 && (port) > -256)			\
			__asm__ __volatile__(				\
			"strh	%0, [%1, %2]	@ outwc"		\
			: : "r" (v), "r" (PCIO_BASE), "Jr" ((port)));	\
		else if ((port) > 0)					\
			__asm__ __volatile__(				\
			"strh	%0, [%1, %2]	@ outwc"		\
			: : "r" (v),					\
			    "r" (PCIO_BASE + ((port) & ~0xff)),		\
			     "Jr" (((port) & 0xff)));			\
		else							\
			__asm__ __volatile__(				\
			"strh	%0, [%1, #0]	@ outwc"		\
			: : "r" (v),					\
			    "r" (PCIO_BASE + (port)));			\
	} else								\
		__asm__ __volatile__(					\
		"strh	%0, [%1, #0]	@ outwc"			\
		: : "r" (v), "r" ((port)));				\
})

#define __inwc(port)							\
({									\
	unsigned short result;						\
	if (__PORT_PCIO((port))) {					\
		if ((port) < 256 && (port) > -256 )			\
			__asm__ __volatile__(				\
			"ldrh	%0, [%1, %2]	@ inwc"			\
			: "=r" (result)					\
			: "r" (PCIO_BASE),				\
			  "Jr" ((port)));				\
		else if ((port) > 0)					\
			__asm__ __volatile__(				\
			"ldrh	%0, [%1, %2]	@ inwc"			\
			: "=r" (result)					\
			: "r" (PCIO_BASE + ((port) & ~0xff)),		\
			  "Jr" (((port) & 0xff)));			\
		else							\
			__asm__ __volatile__(				\
			"ldrh	%0, [%1, #0]	@ inwc"			\
			: "=r" (result)					\
			: "r" (PCIO_BASE + ((port))));			\
	} else								\
		__asm__ __volatile__(					\
		"ldrh	%0, [%1, #0]	@ inwc"				\
		: "=r" (result) : "r" ((port)));			\
	result;								\
})

#define __outlc(value,port)						\
({									\
	unsigned long v = value;					\
	if (__PORT_PCIO((port)))					\
		__asm__ __volatile__(					\
		"str	%0, [%1, %2]	@ outlc"			\
		: : "r" (v), "r" (PCIO_BASE), "Jr" ((port)));	\
	else								\
		__asm__ __volatile__(					\
		"str	%0, [%1, #0]	@ outlc"			\
		: : "r" (v), "r" ((port)));		\
})

#define __inlc(port)							\
({									\
	unsigned long result;						\
	if (__PORT_PCIO((port)))					\
		__asm__ __volatile__(					\
		"ldr	%0, [%1, %2]	@ inlc"				\
		: "=r" (result) : "r" (PCIO_BASE), "Jr" ((port)));	\
	else								\
		__asm__ __volatile__(					\
		"ldr	%0, [%1, #0]	@ inlc"				\
		: "=r" (result) : "r" ((port)));		\
	result;								\
})

#define __ioaddrc(port)	((__PORT_PCIO(port) ? PCIO_BASE + (port) : (void __iomem *)0 + (port)))

#define inb(p)		(__builtin_constant_p((p)) ? __inbc(p)	   : __inb(p))
#define inw(p)		(__builtin_constant_p((p)) ? __inwc(p)	   : __inw(p))
#define inl(p)		(__builtin_constant_p((p)) ? __inlc(p)	   : __inl(p))
#define outb(v,p)	(__builtin_constant_p((p)) ? __outbc(v,p) : __outb(v,p))
#define outw(v,p)	(__builtin_constant_p((p)) ? __outwc(v,p) : __outw(v,p))
#define outl(v,p)	(__builtin_constant_p((p)) ? __outlc(v,p) : __outl(v,p))
#define __ioaddr(p)	(__builtin_constant_p((p)) ? __ioaddr(p)  : __ioaddrc(p))

#define insb(p,d,l)	__raw_readsb(__ioaddr(p),d,l)
#define insw(p,d,l)	__raw_readsw(__ioaddr(p),d,l)
#define insl(p,d,l)	__raw_readsl(__ioaddr(p),d,l)

#define outsb(p,d,l)	__raw_writesb(__ioaddr(p),d,l)
#define outsw(p,d,l)	__raw_writesw(__ioaddr(p),d,l)
#define outsl(p,d,l)	__raw_writesl(__ioaddr(p),d,l)

#endif