#ifndef _ASM_IO_H
#define _ASM_IO_H
#include <linux/string.h>
#include <linux/compiler.h>
/*
* This file contains the definitions for the x86 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.
*/
/*
* Thanks to James van Artsdalen for a better timing-fix than
* the two short jumps: using outb's to a nonexistent port seems
* to guarantee better timings even on fast machines.
*
* On the other hand, I'd like to be sure of a non-existent port:
* I feel a bit unsafe about using 0x80 (should be safe, though)
*
* Linus
*/
/*
* Bit simplified and optimized by Jan Hubicka
* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
*
* isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
* isa_read[wl] and isa_write[wl] fixed
* - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
*/
#define IO_SPACE_LIMIT 0xffff
#define XQUAD_PORTIO_BASE 0xfe400000
#define XQUAD_PORTIO_QUAD 0x40000 /* 256k per quad. */
#ifdef __KERNEL__
#include <asm-generic/iomap.h>
#include <linux/vmalloc.h>
/*
* Convert a virtual cached pointer to an uncached pointer
*/
#define xlate_dev_kmem_ptr(p) p
/**
* virt_to_phys - map virtual addresses to physical
* @address: address to remap
*
* The returned physical address is the physical (CPU) mapping for
* the memory address given. It is only valid to use this function on
* addresses directly mapped or allocated via kmalloc.
*
* This function does not give bus mappings for DMA transfers. In
* almost all conceivable cases a device driver should not be using
* this function
*/
static inline unsigned long virt_to_phys(volatile void *address)
{
return __pa(address);
}
/**
* phys_to_virt - map physical address to virtual
* @address: address to remap
*
* The returned virtual address is a current CPU mapping for
* the memory address given. It is only valid to use this function on
* addresses that have a kernel mapping
*
* This function does not handle bus mappings for DMA transfers. In
* almost all conceivable cases a device driver should not be using
* this function
*/
static inline void *phys_to_virt(unsigned long address)
{
return __va(address);
}
/*
* Change "struct page" to physical address.
*/
#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
/**
* ioremap - map bus memory into CPU space
* @offset: bus address of the memory
* @size: size of the resource to map
*
* ioremap performs a platform specific sequence of operations to
* make bus memory CPU accessible via the readb/readw/readl/writeb/
* writew/writel functions and the other mmio helpers. The returned
* address is not guaranteed to be usable directly as a virtual
* address.
*
* If the area you are trying to map is a PCI BAR you should have a
* look at pci_iomap().
*/
extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size);
extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
/*
* The default ioremap() behavior is non-cached:
*/
static inline void __iomem *ioremap(resource_size_t offset, unsigned long size)
{
return ioremap_nocache(offset, size);
}
extern void iounmap(volatile void __iomem *addr);
/*
* early_ioremap() and early_iounmap() are for temporary early boot-time
* mappings, before the real ioremap() is functional.
* A boot-time mapping is currently limited to at most 16 pages.
*/
extern void early_ioremap_init(void);
extern void early_ioremap_clear(void);
extern void early_ioremap_reset(void);
extern void *early_ioremap(unsigned long offset, unsigned long size);
extern void early_iounmap(void *addr, unsigned long size);
extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys);
/*
* ISA I/O bus memory addresses are 1:1 with the physical address.
*/
#define isa_virt_to_bus virt_to_phys
#define isa_page_to_bus page_to_phys
#define isa_bus_to_virt phys_to_virt
/*
* However PCI ones are not necessarily 1:1 and therefore these interfaces
* are forbidden in portable PCI drivers.
*
* Allow them on x86 for legacy drivers, though.
*/
#define virt_to_bus virt_to_phys
#define bus_to_virt phys_to_virt
/*
* readX/writeX() are used to access memory mapped devices. On some
* architectures the memory mapped IO stuff needs to be accessed
* differently. On the x86 architecture, we just read/write the
* memory location directly.
*/
static inline unsigned char readb(const volatile void __iomem *addr)
{
return *(volatile unsigned char __force *)addr;
}
static inline unsigned short readw(const volatile void __iomem *addr)
{
return *(volatile unsigned short __force *)addr;
}
static inline unsigned int readl(const volatile void __iomem *addr)
{
return *(volatile unsigned int __force *) addr;
}
#define readb_relaxed(addr) readb(addr)
#define readw_relaxed(addr) readw(addr)
#define readl_relaxed(addr) readl(addr)
#define __raw_readb readb
#define __raw_readw readw
#define __raw_readl readl
static inline void writeb(unsigned char b, volatile void __iomem *addr)
{
*(volatile unsigned char __force *)addr = b;
}
static inline void writew(unsigned short b, volatile void __iomem *addr)
{
*(volatile unsigned short __force *)addr = b;
}
static inline void writel(unsigned int b, volatile void __iomem *addr)
{
*(volatile unsigned int __force *)addr = b;
}
#define __raw_writeb writeb
#define __raw_writew writew
#define __raw_writel writel
#define mmiowb()
static inline void
memset_io(volatile void __iomem *addr, unsigned char val, int count)
{
memset((void __force *)addr, val, count);
}
static inline void
memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
{
__memcpy(dst, (const void __force *)src, count);
}
static inline void
memcpy_toio(volatile void __iomem *dst, const void *src, int count)
{
__memcpy((void __force *)dst, src, count);
}
/*
* ISA space is 'always mapped' on a typical x86 system, no need to
* explicitly ioremap() it. The fact that the ISA IO space is mapped
* to PAGE_OFFSET is pure coincidence - it does not mean ISA values
* are physical addresses. The following constant pointer can be
* used as the IO-area pointer (it can be iounmapped as well, so the
* analogy with PCI is quite large):
*/
#define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
/*
* Cache management
*
* This needed for two cases
* 1. Out of order aware processors
* 2. Accidentally out of order processors (PPro errata #51)
*/
#if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE)
static inline void flush_write_buffers(void)
{
asm volatile("lock; addl $0,0(%%esp)": : :"memory");
}
#else
#define flush_write_buffers() do { } while (0)
#endif
#endif /* __KERNEL__ */
extern void native_io_delay(void);
extern int io_delay_type;
extern void io_delay_init(void);
#if defined(CONFIG_PARAVIRT)
#include <asm/paravirt.h>
#else
static inline void slow_down_io(void)
{
native_io_delay();
#ifdef REALLY_SLOW_IO
native_io_delay();
native_io_delay();
native_io_delay();
#endif
}
#endif
#define __BUILDIO(bwl, bw, type) \
static inline void out##bwl(unsigned type value, int port) \
{ \
out##bwl##_local(value, port); \
} \
\
static inline unsigned type in##bwl(int port) \
{ \
return in##bwl##_local(port); \
}
#define BUILDIO(bwl, bw, type) \
static inline void out##bwl##_local(unsigned type value, int port) \
{ \
asm volatile("out" #bwl " %" #bw "0, %w1" \
: : "a"(value), "Nd"(port)); \
} \
\
static inline unsigned type in##bwl##_local(int port) \
{ \
unsigned type value; \
asm volatile("in" #bwl " %w1, %" #bw "0" \
: "=a"(value) : "Nd"(port)); \
return value; \
} \
\
static inline void out##bwl##_local_p(unsigned type value, int port) \
{ \
out##bwl##_local(value, port); \
slow_down_io(); \
} \
\
static inline unsigned type in##bwl##_local_p(int port) \
{ \
unsigned type value = in##bwl##_local(port); \
slow_down_io(); \
return value; \
} \
\
__BUILDIO(bwl, bw, type) \
\
static inline void out##bwl##_p(unsigned type value, int port) \
{ \
out##bwl(value, port); \
slow_down_io(); \
} \
\
static inline unsigned type in##bwl##_p(int port) \
{ \
unsigned type value = in##bwl(port); \
slow_down_io(); \
return value; \
} \
\
static inline void outs##bwl(int port, const void *addr, unsigned long count) \
{ \
asm volatile("rep; outs" #bwl \
: "+S"(addr), "+c"(count) : "d"(port)); \
} \
\
static inline void ins##bwl(int port, void *addr, unsigned long count) \
{ \
asm volatile("rep; ins" #bwl \
: "+D"(addr), "+c"(count) : "d"(port)); \
}
BUILDIO(b, b, char)
BUILDIO(w, w, short)
BUILDIO(l, , int)
#endif
