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#ifndef _ASM_IA64_IO_H
#define _ASM_IA64_IO_H
/*
* This file contains the definitions for the emulated IO instructions
* inb/inw/inl/outb/outw/outl and the "string versions" of the same
* (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
* versions of the single-IO instructions (inb_p/inw_p/..).
*
* This file is not meant to be obfuscating: it's just complicated to
* (a) handle it all in a way that makes gcc able to optimize it as
* well as possible and (b) trying to avoid writing the same thing
* over and over again with slight variations and possibly making a
* mistake somewhere.
*
* Copyright (C) 1998-2001 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
* Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
* Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
*/
/* We don't use IO slowdowns on the ia64, but.. */
#define __SLOW_DOWN_IO do { } while (0)
#define SLOW_DOWN_IO do { } while (0)
#define __IA64_UNCACHED_OFFSET 0xc000000000000000 /* region 6 */
/*
* The legacy I/O space defined by the ia64 architecture supports only 65536 ports, but
* large machines may have multiple other I/O spaces so we can't place any a priori limit
* on IO_SPACE_LIMIT. These additional spaces are described in ACPI.
*/
#define IO_SPACE_LIMIT 0xffffffffffffffffUL
# ifdef __KERNEL__
#include <asm/machvec.h>
#include <asm/page.h>
#include <asm/system.h>
/*
* Change virtual addresses to physical addresses and vv.
*/
static inline unsigned long
virt_to_phys (volatile void *address)
{
return (unsigned long) address - PAGE_OFFSET;
}
static inline void*
phys_to_virt (unsigned long address)
{
return (void *) (address + PAGE_OFFSET);
}
/*
* The following two macros are deprecated and scheduled for removal.
* Please use the PCI-DMA interface defined in <asm/pci.h> instead.
*/
#define bus_to_virt phys_to_virt
#define virt_to_bus virt_to_phys
#define page_to_bus page_to_phys
# endif /* KERNEL */
/*
* Memory fence w/accept. This should never be used in code that is
* not IA-64 specific.
*/
#define __ia64_mf_a() __asm__ __volatile__ ("mf.a" ::: "memory")
static inline const unsigned long
__ia64_get_io_port_base (void)
{
extern unsigned long ia64_iobase;
return ia64_iobase;
}
static inline void*
__ia64_mk_io_addr (unsigned long port)
{
const unsigned long io_base = __ia64_get_io_port_base();
unsigned long addr;
addr = io_base | ((port >> 2) << 12) | (port & 0xfff);
return (void *) addr;
}
/*
* For the in/out routines, we need to do "mf.a" _after_ doing the I/O access to ensure
* that the access has completed before executing other I/O accesses. Since we're doing
* the accesses through an uncachable (UC) translation, the CPU will execute them in
* program order. However, we still need to tell the compiler not to shuffle them around
* during optimization, which is why we use "volatile" pointers.
*/
static inline unsigned int
__ia64_inb (unsigned long port)
{
volatile unsigned char *addr = __ia64_mk_io_addr(port);
unsigned char ret;
ret = *addr;
__ia64_mf_a();
return ret;
}
static inline unsigned int
__ia64_inw (unsigned long port)
{
volatile unsigned short *addr = __ia64_mk_io_addr(port);
unsigned short ret;
ret = *addr;
__ia64_mf_a();
return ret;
}
static inline unsigned int
__ia64_inl (unsigned long port)
{
volatile unsigned int *addr = __ia64_mk_io_addr(port);
unsigned int ret;
ret = *addr;
__ia64_mf_a();
return ret;
}
static inline void
__ia64_outb (unsigned char val, unsigned long port)
{
volatile unsigned char *addr = __ia64_mk_io_addr(port);
*addr = val;
__ia64_mf_a();
}
static inline void
__ia64_outw (unsigned short val, unsigned long port)
{
volatile unsigned short *addr = __ia64_mk_io_addr(port);
*addr = val;
__ia64_mf_a();
}
static inline void
__ia64_outl (unsigned int val, unsigned long port)
{
volatile unsigned int *addr = __ia64_mk_io_addr(port);
*addr = val;
__ia64_mf_a();
}
static inline void
__insb (unsigned long port, void *dst, unsigned long count)
{
unsigned char *dp = dst;
if (platform_inb == __ia64_inb) {
volatile unsigned char *addr = __ia64_mk_io_addr(port);
__ia64_mf_a();
while (count--)
*dp++ = *addr;
__ia64_mf_a();
} else
while (count--)
*dp++ = platform_inb(port);
return;
}
static inline void
__insw (unsigned long port, void *dst, unsigned long count)
{
unsigned short *dp = dst;
if (platform_inw == __ia64_inw) {
volatile unsigned short *addr = __ia64_mk_io_addr(port);
__ia64_mf_a();
while (count--)
*dp++ = *addr;
__ia64_mf_a();
} else
while (count--)
*dp++ = platform_inw(port);
return;
}
static inline void
__insl (unsigned long port, void *dst, unsigned long count)
{
unsigned int *dp = dst;
if (platform_inl == __ia64_inl) {
volatile unsigned int *addr = __ia64_mk_io_addr(port);
__ia64_mf_a();
while (count--)
*dp++ = *addr;
__ia64_mf_a();
} else
while (count--)
*dp++ = platform_inl(port);
return;
}
static inline void
__outsb (unsigned long port, const void *src, unsigned long count)
{
const unsigned char *sp = src;
if (platform_outb == __ia64_outb) {
volatile unsigned char *addr = __ia64_mk_io_addr(port);
while (count--)
*addr = *sp++;
__ia64_mf_a();
} else
while (count--)
platform_outb(*sp++, port);
return;
}
static inline void
__outsw (unsigned long port, const void *src, unsigned long count)
{
const unsigned short *sp = src;
if (platform_outw == __ia64_outw) {
volatile unsigned short *addr = __ia64_mk_io_addr(port);
while (count--)
*addr = *sp++;
__ia64_mf_a();
} else
while (count--)
platform_outw(*sp++, port);
return;
}
static inline void
__outsl (unsigned long port, void *src, unsigned long count)
{
const unsigned int *sp = src;
if (platform_outl == __ia64_outl) {
volatile unsigned int *addr = __ia64_mk_io_addr(port);
while (count--)
*addr = *sp++;
__ia64_mf_a();
} else
while (count--)
platform_outl(*sp++, port);
return;
}
/*
* Unfortunately, some platforms are broken and do not follow the
* IA-64 architecture specification regarding legacy I/O support.
* Thus, we have to make these operations platform dependent...
*/
#define __inb platform_inb
#define __inw platform_inw
#define __inl platform_inl
#define __outb platform_outb
#define __outw platform_outw
#define __outl platform_outl
#define inb __inb
#define inw __inw
#define inl __inl
#define insb __insb
#define insw __insw
#define insl __insl
#define outb __outb
#define outw __outw
#define outl __outl
#define outsb __outsb
#define outsw __outsw
#define outsl __outsl
/*
* The address passed to these functions are ioremap()ped already.
*/
static inline unsigned char
__readb (void *addr)
{
return *(volatile unsigned char *)addr;
}
static inline unsigned short
__readw (void *addr)
{
return *(volatile unsigned short *)addr;
}
static inline unsigned int
__readl (void *addr)
{
return *(volatile unsigned int *) addr;
}
static inline unsigned long
__readq (void *addr)
{
return *(volatile unsigned long *) addr;
}
static inline void
__writeb (unsigned char val, void *addr)
{
*(volatile unsigned char *) addr = val;
}
static inline void
__writew (unsigned short val, void *addr)
{
*(volatile unsigned short *) addr = val;
}
static inline void
__writel (unsigned int val, void *addr)
{
*(volatile unsigned int *) addr = val;
}
static inline void
__writeq (unsigned long val, void *addr)
{
*(volatile unsigned long *) addr = val;
}
#define readb(a) __readb((void *)(a))
#define readw(a) __readw((void *)(a))
#define readl(a) __readl((void *)(a))
#define readq(a) __readq((void *)(a))
#define __raw_readb readb
#define __raw_readw readw
#define __raw_readl readl
#define __raw_readq readq
#define writeb(v,a) __writeb((v), (void *) (a))
#define writew(v,a) __writew((v), (void *) (a))
#define writel(v,a) __writel((v), (void *) (a))
#define writeq(v,a) __writeq((v), (void *) (a))
#define __raw_writeb writeb
#define __raw_writew writew
#define __raw_writel writel
#define __raw_writeq writeq
#ifndef inb_p
# define inb_p inb
#endif
#ifndef inw_p
# define inw_p inw
#endif
#ifndef inl_p
# define inl_p inl
#endif
#ifndef outb_p
# define outb_p outb
#endif
#ifndef outw_p
# define outw_p outw
#endif
#ifndef outl_p
# define outl_p outl
#endif
/*
* An "address" in IO memory space is not clearly either an integer or a pointer. We will
* accept both, thus the casts.
*
* On ia-64, we access the physical I/O memory space through the uncached kernel region.
*/
static inline void *
ioremap (unsigned long offset, unsigned long size)
{
return (void *) (__IA64_UNCACHED_OFFSET | (offset));
}
static inline void
iounmap (void *addr)
{
}
#define ioremap_nocache(o,s) ioremap(o,s)
# ifdef __KERNEL__
/*
* String version of IO memory access ops:
*/
extern void __ia64_memcpy_fromio (void *, unsigned long, long);
extern void __ia64_memcpy_toio (unsigned long, void *, long);
extern void __ia64_memset_c_io (unsigned long, unsigned long, long);
#define memcpy_fromio(to,from,len) \
__ia64_memcpy_fromio((to),(unsigned long)(from),(len))
#define memcpy_toio(to,from,len) \
__ia64_memcpy_toio((unsigned long)(to),(from),(len))
#define memset_io(addr,c,len) \
__ia64_memset_c_io((unsigned long)(addr),0x0101010101010101UL*(u8)(c),(len))
# endif /* __KERNEL__ */
#endif /* _ASM_IA64_IO_H */
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