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linux/include/asm-ia64/io.h
John Keller 8ea6091f50 Altix: Add initial ACPI IO support 
First phase in introducing ACPI support to SN.
In this phase, when running with an ACPI capable PROM,
the DSDT will define the root busses and all SN nodes
(SGIHUB, SGITIO). An ACPI bus driver will be registered
for the node devices, with the acpi_pci_root_driver being
used for the root busses. An ACPI vendor descriptor is
now used to pass platform specific information for both
nodes and busses, eliminating the need for the current
SAL calls. Also, with ACPI support, SN fixup code is no longer
needed to initiate the PCI bus scans, as the acpi_pci_root_driver
does that.

However, to maintain backward compatibility with non-ACPI capable
PROMs, none of the current 'fixup' code can been deleted, though
much restructuring has been done. For example, the bulk of the code
in io_common.c is relocated code that is now common regardless
of what PROM is running, while io_acpi_init.c and io_init.c contain
routines specific to an ACPI or non ACPI capable PROM respectively.

A new pci bus fixup platform vector has been created to provide
a hook for invoking platform specific bus fixup from pcibios_fixup_bus().

The size of io_space[] has been increased to support systems with
large IO configurations.


Signed-off-by: John Keller <jpk@sgi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-12-01 14:36:57 -08:00

473 lines
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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) 1998-2003 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 RGN_BASE(RGN_UNCACHED)
/*
* 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
#define MAX_IO_SPACES_BITS 8
#define MAX_IO_SPACES (1UL << MAX_IO_SPACES_BITS)
#define IO_SPACE_BITS 24
#define IO_SPACE_SIZE (1UL << IO_SPACE_BITS)
#define IO_SPACE_NR(port) ((port) >> IO_SPACE_BITS)
#define IO_SPACE_BASE(space) ((space) << IO_SPACE_BITS)
#define IO_SPACE_PORT(port) ((port) & (IO_SPACE_SIZE - 1))
#define IO_SPACE_SPARSE_ENCODING(p) ((((p) >> 2) << 12) | ((p) & 0xfff))
struct io_space {
unsigned long mmio_base; /* base in MMIO space */
int sparse;
};
extern struct io_space io_space[];
extern unsigned int num_io_spaces;
# ifdef __KERNEL__
/*
* All MMIO iomem cookies are in region 6; anything less is a PIO cookie:
* 0xCxxxxxxxxxxxxxxx MMIO cookie (return from ioremap)
* 0x000000001SPPPPPP PIO cookie (S=space number, P..P=port)
*
* ioread/writeX() uses the leading 1 in PIO cookies (PIO_OFFSET) to catch
* code that uses bare port numbers without the prerequisite pci_iomap().
*/
#define PIO_OFFSET (1UL << (MAX_IO_SPACES_BITS + IO_SPACE_BITS))
#define PIO_MASK (PIO_OFFSET - 1)
#define PIO_RESERVED __IA64_UNCACHED_OFFSET
#define HAVE_ARCH_PIO_SIZE
#include <asm/intrinsics.h>
#include <asm/machvec.h>
#include <asm/page.h>
#include <asm/system.h>
#include <asm-generic/iomap.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);
}
#define ARCH_HAS_VALID_PHYS_ADDR_RANGE
extern u64 kern_mem_attribute (unsigned long phys_addr, unsigned long size);
extern int valid_phys_addr_range (unsigned long addr, size_t count); /* efi.c */
extern int valid_mmap_phys_addr_range (unsigned long pfn, size_t count);
/*
* 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() ia64_mfa()
/**
* ___ia64_mmiowb - I/O write barrier
*
* Ensure ordering of I/O space writes. This will make sure that writes
* following the barrier will arrive after all previous writes. For most
* ia64 platforms, this is a simple 'mf.a' instruction.
*
* See Documentation/DocBook/deviceiobook.tmpl for more information.
*/
static inline void ___ia64_mmiowb(void)
{
ia64_mfa();
}
static inline void*
__ia64_mk_io_addr (unsigned long port)
{
struct io_space *space;
unsigned long offset;
space = &io_space[IO_SPACE_NR(port)];
port = IO_SPACE_PORT(port);
if (space->sparse)
offset = IO_SPACE_SPARSE_ENCODING(port);
else
offset = port;
return (void *) (space->mmio_base | offset);
}
#define __ia64_inb ___ia64_inb
#define __ia64_inw ___ia64_inw
#define __ia64_inl ___ia64_inl
#define __ia64_outb ___ia64_outb
#define __ia64_outw ___ia64_outw
#define __ia64_outl ___ia64_outl
#define __ia64_readb ___ia64_readb
#define __ia64_readw ___ia64_readw
#define __ia64_readl ___ia64_readl
#define __ia64_readq ___ia64_readq
#define __ia64_readb_relaxed ___ia64_readb
#define __ia64_readw_relaxed ___ia64_readw
#define __ia64_readl_relaxed ___ia64_readl
#define __ia64_readq_relaxed ___ia64_readq
#define __ia64_writeb ___ia64_writeb
#define __ia64_writew ___ia64_writew
#define __ia64_writel ___ia64_writel
#define __ia64_writeq ___ia64_writeq
#define __ia64_mmiowb ___ia64_mmiowb
/*
* 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;
while (count--)
*dp++ = platform_inb(port);
}
static inline void
__insw (unsigned long port, void *dst, unsigned long count)
{
unsigned short *dp = dst;
while (count--)
*dp++ = platform_inw(port);
}
static inline void
__insl (unsigned long port, void *dst, unsigned long count)
{
unsigned int *dp = dst;
while (count--)
*dp++ = platform_inl(port);
}
static inline void
__outsb (unsigned long port, const void *src, unsigned long count)
{
const unsigned char *sp = src;
while (count--)
platform_outb(*sp++, port);
}
static inline void
__outsw (unsigned long port, const void *src, unsigned long count)
{
const unsigned short *sp = src;
while (count--)
platform_outw(*sp++, port);
}
static inline void
__outsl (unsigned long port, const void *src, unsigned long count)
{
const unsigned int *sp = src;
while (count--)
platform_outl(*sp++, port);
}
/*
* 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 __mmiowb platform_mmiowb
#define inb(p) __inb(p)
#define inw(p) __inw(p)
#define inl(p) __inl(p)
#define insb(p,d,c) __insb(p,d,c)
#define insw(p,d,c) __insw(p,d,c)
#define insl(p,d,c) __insl(p,d,c)
#define outb(v,p) __outb(v,p)
#define outw(v,p) __outw(v,p)
#define outl(v,p) __outl(v,p)
#define outsb(p,s,c) __outsb(p,s,c)
#define outsw(p,s,c) __outsw(p,s,c)
#define outsl(p,s,c) __outsl(p,s,c)
#define mmiowb() __mmiowb()
/*
* The address passed to these functions are ioremap()ped already.
*
* We need these to be machine vectors since some platforms don't provide
* DMA coherence via PIO reads (PCI drivers and the spec imply that this is
* a good idea). Writes are ok though for all existing ia64 platforms (and
* hopefully it'll stay that way).
*/
static inline unsigned char
___ia64_readb (const volatile void __iomem *addr)
{
return *(volatile unsigned char __force *)addr;
}
static inline unsigned short
___ia64_readw (const volatile void __iomem *addr)
{
return *(volatile unsigned short __force *)addr;
}
static inline unsigned int
___ia64_readl (const volatile void __iomem *addr)
{
return *(volatile unsigned int __force *) addr;
}
static inline unsigned long
___ia64_readq (const volatile void __iomem *addr)
{
return *(volatile unsigned long __force *) addr;
}
static inline void
__writeb (unsigned char val, volatile void __iomem *addr)
{
*(volatile unsigned char __force *) addr = val;
}
static inline void
__writew (unsigned short val, volatile void __iomem *addr)
{
*(volatile unsigned short __force *) addr = val;
}
static inline void
__writel (unsigned int val, volatile void __iomem *addr)
{
*(volatile unsigned int __force *) addr = val;
}
static inline void
__writeq (unsigned long val, volatile void __iomem *addr)
{
*(volatile unsigned long __force *) addr = val;
}
#define __readb platform_readb
#define __readw platform_readw
#define __readl platform_readl
#define __readq platform_readq
#define __readb_relaxed platform_readb_relaxed
#define __readw_relaxed platform_readw_relaxed
#define __readl_relaxed platform_readl_relaxed
#define __readq_relaxed platform_readq_relaxed
#define readb(a) __readb((a))
#define readw(a) __readw((a))
#define readl(a) __readl((a))
#define readq(a) __readq((a))
#define readb_relaxed(a) __readb_relaxed((a))
#define readw_relaxed(a) __readw_relaxed((a))
#define readl_relaxed(a) __readl_relaxed((a))
#define readq_relaxed(a) __readq_relaxed((a))
#define __raw_readb readb
#define __raw_readw readw
#define __raw_readl readl
#define __raw_readq readq
#define __raw_readb_relaxed readb_relaxed
#define __raw_readw_relaxed readw_relaxed
#define __raw_readl_relaxed readl_relaxed
#define __raw_readq_relaxed readq_relaxed
#define writeb(v,a) __writeb((v), (a))
#define writew(v,a) __writew((v), (a))
#define writel(v,a) __writel((v), (a))
#define writeq(v,a) __writeq((v), (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
# ifdef __KERNEL__
extern void __iomem * ioremap(unsigned long offset, unsigned long size);
extern void __iomem * ioremap_nocache (unsigned long offset, unsigned long size);
static inline void
iounmap (volatile void __iomem *addr)
{
}
/* Use normal IO mappings for DMI */
#define dmi_ioremap ioremap
#define dmi_iounmap(x,l) iounmap(x)
#define dmi_alloc(l) kmalloc(l, GFP_ATOMIC)
/*
* String version of IO memory access ops:
*/
extern void memcpy_fromio(void *dst, const volatile void __iomem *src, long n);
extern void memcpy_toio(volatile void __iomem *dst, const void *src, long n);
extern void memset_io(volatile void __iomem *s, int c, long n);
#define dma_cache_inv(_start,_size) do { } while (0)
#define dma_cache_wback(_start,_size) do { } while (0)
#define dma_cache_wback_inv(_start,_size) do { } while (0)
# endif /* __KERNEL__ */
/*
* Enabling BIO_VMERGE_BOUNDARY forces us to turn off I/O MMU bypassing. It is said that
* BIO-level virtual merging can give up to 4% performance boost (not verified for ia64).
* On the other hand, we know that I/O MMU bypassing gives ~8% performance improvement on
* SPECweb-like workloads on zx1-based machines. Thus, for now we favor I/O MMU bypassing
* over BIO-level virtual merging.
*/
extern unsigned long ia64_max_iommu_merge_mask;
#if 1
#define BIO_VMERGE_BOUNDARY 0
#else
/*
* It makes no sense at all to have this BIO_VMERGE_BOUNDARY macro here. Should be
* replaced by dma_merge_mask() or something of that sort. Note: the only way
* BIO_VMERGE_BOUNDARY is used is to mask off bits. Effectively, our definition gets
* expanded into:
*
* addr & ((ia64_max_iommu_merge_mask + 1) - 1) == (addr & ia64_max_iommu_vmerge_mask)
*
* which is precisely what we want.
*/
#define BIO_VMERGE_BOUNDARY (ia64_max_iommu_merge_mask + 1)
#endif
#endif /* _ASM_IA64_IO_H */
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