io.h

h内核

/*
 * linux/include/asm-arm/arch-ixdp2000/io.h
 *
 * Original Author: Naeem M Afzal <[e-mail]>
 * Maintainer: Deepak Saxena <[e-mail]>
 *
 * Copyright (C) 2002  Intel Corp.
 * Copyrgiht (C) 2003-2004 MontaVista Software, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef __ASM_ARM_ARCH_IO_H
#define __ASM_ARM_ARCH_IO_H

#define IO_SPACE_LIMIT		0xffffffff
#define __mem_pci(a)		(a)

/*
 * Pick up VMALLOC_END
 */
#define ___io(p)		((void __iomem *)((p)+IXP2000_PCI_IO_VIRT_BASE))

/*
 * IXP2000 does not do proper byte-lane conversion for PCI addresses,
 * so we need to override standard functions.
 */
#define alignb(addr)		(((unsigned long)addr & ~3) + (3 - ((unsigned long)addr & 3)))
#define alignw(addr)		(((unsigned long)addr & ~2) + (2 - ((unsigned long)addr & 2)))

#define outb(v,p)		__raw_writeb(v,alignb(___io(p)))
#define outw(v,p)		__raw_writew((v),alignw(___io(p)))
#define outl(v,p)		__raw_writel((v),___io(p))

#define inb(p)		({ unsigned int __v = __raw_readb(alignb(___io(p))); __v; })
#define inw(p)		\
	({ unsigned int __v = (__raw_readw(alignw(___io(p)))); __v; })
#define inl(p)		\
	({ unsigned int __v = (__raw_readl(___io(p))); __v; })

#define outsb(p,d,l)		__raw_writesb(alignb(___io(p)),d,l)
#define outsw(p,d,l)		__raw_writesw(alignw(___io(p)),d,l)
#define outsl(p,d,l)		__raw_writesl(___io(p),d,l)

#define insb(p,d,l)		__raw_readsb(alignb(___io(p)),d,l)
#define insw(p,d,l)		__raw_readsw(alignw(___io(p)),d,l)
#define insl(p,d,l)		__raw_readsl(___io(p),d,l)


#ifdef CONFIG_ARCH_IXDP2X01
/*
 * This is an ugly hack but the CS8900 on the 2x01's does not sit in any sort
 * of "I/O space" and is just direct mapped into a 32-bit-only addressable
 * bus. The address space for this bus is such that we can't really easilly
 * make it contigous to the PCI I/O address range, and it also does not
 * need swapping like PCI addresses do (IXDP2x01 is a BE platform).
 * B/C of this we can't use the standard in/out functions and need to
 * runtime check if the incoming address is a PCI address or for
 * the CS89x0.
 */
#undef inw
#undef outw
#undef insw
#undef outsw

#include <asm/mach-types.h>

static inline void insw(u32 ptr, void *buf, int length)
{
	register volatile u32 *port = (volatile u32 *)ptr;

	/*
	 * Is this cycle meant for the CS8900?
	 */
	if ((machine_is_ixdp2401() || machine_is_ixdp2801()) && 
		((port >= IXDP2X01_CS8900_VIRT_BASE) && 
		 (port <= IXDP2X01_CS8900_VIRT_END))) {
		u8 *buf8 = (u8*)buf;
		register u32 tmp32;

		do {
			tmp32 = *port;
			*buf8++ = (u8)tmp32;
			*buf8++ = (u8)(tmp32 >> 8);
		} while(--length);

		return;
	}

	__raw_readsw(alignw(___io(ptr)),buf,length);
}

static inline void outsw(u32 ptr, void *buf, int length)
{
	register volatile u32 *port = (volatile u32 *)ptr;

	/*
	 * Is this cycle meant for the CS8900?
	 */
	if ((machine_is_ixdp2401() || machine_is_ixdp2801()) && 
		((port >= IXDP2X01_CS8900_VIRT_BASE) && 
		 (port <= IXDP2X01_CS8900_VIRT_END))) {
		register u32 tmp32;
		u8 *buf8 = (u8*)buf;
		do {
			tmp32 = *buf8++;
			tmp32 |= (*buf8++) << 8;
			*port = tmp32;
		} while(--length);
		return;
	}

	__raw_writesw(alignw(___io(ptr)),buf,length);
}


static inline u16 inw(u32 ptr)
{
	register volatile u32 *port = (volatile u32 *)ptr;

	/*
	 * Is this cycle meant for the CS8900?
	 */
	if ((machine_is_ixdp2401() || machine_is_ixdp2801()) && 
		((port >= IXDP2X01_CS8900_VIRT_BASE) && 
		 (port <= IXDP2X01_CS8900_VIRT_END))) {
		return (u16)(*port);  
	}

	return __raw_readw(alignw(___io(ptr)));
}

static inline void outw(u16 value, u32 ptr)
{
	register volatile u32 *port = (volatile u32 *)ptr;

	if ((machine_is_ixdp2401() || machine_is_ixdp2801()) && 
		((port >= IXDP2X01_CS8900_VIRT_BASE) && 
		 (port <= IXDP2X01_CS8900_VIRT_END))) {
		*port = value;  
		return;
	}

	__raw_writew((value),alignw(___io(ptr)));
}
#endif	/* IXDP2x01 */

#endif