io.c

linux 内核源代码

/*
 * Copyright (C) 2002  David McCullough <[e-mail]>
 * Copyright (C) 2001  Ian da Silva, Jeremy Siegel
 * Based largely on io_se.c.
 *
 * I/O routine for Hitachi 7751 SolutionEngine.
 *
 * Initial version only to support LAN access; some
 * placeholder code from io_se.c left in with the
 * expectation of later SuperIO and PCMCIA access.
 */
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <asm/io.h>
#include <asm/addrspace.h>

#ifdef CONFIG_SH_SECUREEDGE5410
unsigned short secureedge5410_ioport;
#endif

static inline volatile __u16 *port2adr(unsigned int port)
{
	maybebadio((unsigned long)port);
	return (volatile __u16*)port;
}

/*
 * General outline: remap really low stuff [eventually] to SuperIO,
 * stuff in PCI IO space (at or above window at pci.h:PCIBIOS_MIN_IO)
 * is mapped through the PCI IO window.  Stuff with high bits (PXSEG)
 * should be way beyond the window, and is used  w/o translation for
 * compatibility.
 */
unsigned char snapgear_inb(unsigned long port)
{
	if (PXSEG(port))
		return *(volatile unsigned char *)port;
	else if (is_pci_ioaddr(port))
		return *(volatile unsigned char *)pci_ioaddr(port);
	else
		return (*port2adr(port)) & 0xff;
}

unsigned char snapgear_inb_p(unsigned long port)
{
	unsigned char v;

	if (PXSEG(port))
		v = *(volatile unsigned char *)port;
	else if (is_pci_ioaddr(port))
		v = *(volatile unsigned char *)pci_ioaddr(port);
	else
		v = (*port2adr(port))&0xff;
	ctrl_delay();
	return v;
}

unsigned short snapgear_inw(unsigned long port)
{
	if (PXSEG(port))
		return *(volatile unsigned short *)port;
	else if (is_pci_ioaddr(port))
		return *(volatile unsigned short *)pci_ioaddr(port);
	else if (port >= 0x2000)
		return *port2adr(port);
	else
		maybebadio(port);
	return 0;
}

unsigned int snapgear_inl(unsigned long port)
{
	if (PXSEG(port))
		return *(volatile unsigned long *)port;
	else if (is_pci_ioaddr(port))
		return *(volatile unsigned int *)pci_ioaddr(port);
	else if (port >= 0x2000)
		return *port2adr(port);
	else
		maybebadio(port);
	return 0;
}

void snapgear_outb(unsigned char value, unsigned long port)
{

	if (PXSEG(port))
		*(volatile unsigned char *)port = value;
	else if (is_pci_ioaddr(port))
		*((unsigned char*)pci_ioaddr(port)) = value;
	else
		*(port2adr(port)) = value;
}

void snapgear_outb_p(unsigned char value, unsigned long port)
{
	if (PXSEG(port))
		*(volatile unsigned char *)port = value;
	else if (is_pci_ioaddr(port))
		*((unsigned char*)pci_ioaddr(port)) = value;
	else
		*(port2adr(port)) = value;
	ctrl_delay();
}

void snapgear_outw(unsigned short value, unsigned long port)
{
	if (PXSEG(port))
		*(volatile unsigned short *)port = value;
	else if (is_pci_ioaddr(port))
		*((unsigned short *)pci_ioaddr(port)) = value;
	else if (port >= 0x2000)
		*port2adr(port) = value;
	else
		maybebadio(port);
}

void snapgear_outl(unsigned int value, unsigned long port)
{
	if (PXSEG(port))
		*(volatile unsigned long *)port = value;
	else if (is_pci_ioaddr(port))
		*((unsigned long*)pci_ioaddr(port)) = value;
	else
		maybebadio(port);
}

void snapgear_insl(unsigned long port, void *addr, unsigned long count)
{
	maybebadio(port);
}

void snapgear_outsl(unsigned long port, const void *addr, unsigned long count)
{
	maybebadio(port);
}