/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2000-2004 Silicon Graphics, Inc. All rights reserved.
*/

#ifndef _ASM_SN_IO_H
#define _ASM_SN_IO_H
#include <linux/compiler.h>
#include <asm/intrinsics.h>

extern void * sn_io_addr(unsigned long port) __attribute_const__; /* Forward definition */
extern void __sn_mmiowb(void); /* Forward definition */

extern int num_cnodes;

#define __sn_mf_a() ia64_mfa()

extern void sn_dma_flush(unsigned long);

#define __sn_inb ___sn_inb
#define __sn_inw ___sn_inw
#define __sn_inl ___sn_inl
#define __sn_outb ___sn_outb
#define __sn_outw ___sn_outw
#define __sn_outl ___sn_outl
#define __sn_readb ___sn_readb
#define __sn_readw ___sn_readw
#define __sn_readl ___sn_readl
#define __sn_readq ___sn_readq
#define __sn_readb_relaxed ___sn_readb_relaxed
#define __sn_readw_relaxed ___sn_readw_relaxed
#define __sn_readl_relaxed ___sn_readl_relaxed
#define __sn_readq_relaxed ___sn_readq_relaxed

/*
* Convenience macros for setting/clearing bits using the above accessors
*/

#define __sn_setq_relaxed(addr, val) \
writeq((__sn_readq_relaxed(addr) | (val)), (addr))
#define __sn_clrq_relaxed(addr, val) \
writeq((__sn_readq_relaxed(addr) & ~(val)), (addr))

/*
* The following routines are SN Platform specific, called when
* a reference is made to inX/outX set macros. SN Platform
* inX set of macros ensures that Posted DMA writes on the
* Bridge is flushed.
*
* The routines should be self explainatory.
*/

static inline unsigned int
___sn_inb (unsigned long port)
{
volatile unsigned char *addr;
unsigned char ret = -1;

if ((addr = sn_io_addr(port))) {
ret = *addr;
__sn_mf_a();
sn_dma_flush((unsigned long)addr);
}
return ret;
}

static inline unsigned int
___sn_inw (unsigned long port)
{
volatile unsigned short *addr;
unsigned short ret = -1;

if ((addr = sn_io_addr(port))) {
ret = *addr;
__sn_mf_a();
sn_dma_flush((unsigned long)addr);
}
return ret;
}

static inline unsigned int
___sn_inl (unsigned long port)
{
volatile unsigned int *addr;
unsigned int ret = -1;

if ((addr = sn_io_addr(port))) {
ret = *addr;
__sn_mf_a();
sn_dma_flush((unsigned long)addr);
}
return ret;
}

static inline void
___sn_outb (unsigned char val, unsigned long port)
{
volatile unsigned char *addr;

if ((addr = sn_io_addr(port))) {
*addr = val;
__sn_mmiowb();
}
}

static inline void
___sn_outw (unsigned short val, unsigned long port)
{
volatile unsigned short *addr;

if ((addr = sn_io_addr(port))) {
*addr = val;
__sn_mmiowb();
}
}

static inline void
___sn_outl (unsigned int val, unsigned long port)
{
volatile unsigned int *addr;

if ((addr = sn_io_addr(port))) {
*addr = val;
__sn_mmiowb();
}
}

/*
* The following routines are SN Platform specific, called when
* a reference is made to readX/writeX set macros. SN Platform
* readX set of macros ensures that Posted DMA writes on the
* Bridge is flushed.
*
* The routines should be self explainatory.
*/

static inline unsigned char
___sn_readb (const volatile void __iomem *addr)
{
unsigned char val;

val = *(volatile unsigned char __force *)addr;
__sn_mf_a();
sn_dma_flush((unsigned long)addr);
return val;
}

static inline unsigned short
___sn_readw (const volatile void __iomem *addr)
{
unsigned short val;

val = *(volatile unsigned short __force *)addr;
__sn_mf_a();
sn_dma_flush((unsigned long)addr);
return val;
}

static inline unsigned int
___sn_readl (const volatile void __iomem *addr)
{
unsigned int val;

val = *(volatile unsigned int __force *)addr;
__sn_mf_a();
sn_dma_flush((unsigned long)addr);
return val;
}

static inline unsigned long
___sn_readq (const volatile void __iomem *addr)
{
unsigned long val;

val = *(volatile unsigned long __force *)addr;
__sn_mf_a();
sn_dma_flush((unsigned long)addr);
return val;
}

/*
* For generic and SN2 kernels, we have a set of fast access
* PIO macros. These macros are provided on SN Platform
* because the normal inX and readX macros perform an
* additional task of flushing Post DMA request on the Bridge.
*
* These routines should be self explainatory.
*/

static inline unsigned int
sn_inb_fast (unsigned long port)
{
volatile unsigned char *addr = (unsigned char *)port;
unsigned char ret;

ret = *addr;
__sn_mf_a();
return ret;
}

static inline unsigned int
sn_inw_fast (unsigned long port)
{
volatile unsigned short *addr = (unsigned short *)port;
unsigned short ret;

ret = *addr;
__sn_mf_a();
return ret;
}

static inline unsigned int
sn_inl_fast (unsigned long port)
{
volatile unsigned int *addr = (unsigned int *)port;
unsigned int ret;

ret = *addr;
__sn_mf_a();
return ret;
}

static inline unsigned char
___sn_readb_relaxed (const volatile void __iomem *addr)
{
return *(volatile unsigned char __force *)addr;
}

static inline unsigned short
___sn_readw_relaxed (const volatile void __iomem *addr)
{
return *(volatile unsigned short __force *)addr;
}

static inline unsigned int
___sn_readl_relaxed (const volatile void __iomem *addr)
{
return *(volatile unsigned int __force *) addr;
}

static inline unsigned long
___sn_readq_relaxed (const volatile void __iomem *addr)
{
return *(volatile unsigned long __force *) addr;
}

struct pci_dev;

static inline int
sn_pci_set_vchan(struct pci_dev *pci_dev, unsigned long *addr, int vchan)
{

if (vchan > 1) {
return -1;
}

if (!(*addr >> 32)) /* Using a mask here would be cleaner */
return 0; /* but this generates better code */

if (vchan == 1) {
/* Set Bit 57 */
*addr |= (1UL << 57);
} else {
/* Clear Bit 57 */
*addr &= ~(1UL << 57);
}

return 0;
}

#endif /* _ASM_SN_IO_H */