346 строки
9.9 KiB
C
346 строки
9.9 KiB
C
#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 physical pointer to a virtual kernel pointer for /dev/mem
|
|
* access
|
|
*/
|
|
#define xlate_dev_mem_ptr(p) __va(p)
|
|
|
|
/*
|
|
* 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)
|
|
|
|
extern void __iomem * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
|
|
static inline void __iomem * ioremap(unsigned long offset, unsigned long size)
|
|
{
|
|
return __ioremap(offset, size, 0);
|
|
}
|
|
|
|
extern void __iomem * ioremap_nocache(unsigned long offset, unsigned long size);
|
|
extern void iounmap(volatile void __iomem *addr);
|
|
|
|
/*
|
|
* bt_ioremap() and bt_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 *bt_ioremap(unsigned long offset, unsigned long size);
|
|
extern void bt_iounmap(void *addr, unsigned long size);
|
|
|
|
/* Use early IO mappings for DMI because it's initialized early */
|
|
#define dmi_ioremap bt_ioremap
|
|
#define dmi_iounmap bt_iounmap
|
|
#define dmi_alloc alloc_bootmem
|
|
|
|
/*
|
|
* 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, (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");
|
|
}
|
|
|
|
#define dma_cache_inv(_start,_size) flush_write_buffers()
|
|
#define dma_cache_wback(_start,_size) flush_write_buffers()
|
|
#define dma_cache_wback_inv(_start,_size) flush_write_buffers()
|
|
|
|
#else
|
|
|
|
/* Nothing to do */
|
|
|
|
#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)
|
|
#define flush_write_buffers()
|
|
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
static inline void native_io_delay(void)
|
|
{
|
|
asm volatile("outb %%al,$0x80" : : : "memory");
|
|
}
|
|
|
|
#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
|
|
|
|
#ifdef CONFIG_X86_NUMAQ
|
|
extern void *xquad_portio; /* Where the IO area was mapped */
|
|
#define XQUAD_PORT_ADDR(port, quad) (xquad_portio + (XQUAD_PORTIO_QUAD*quad) + port)
|
|
#define __BUILDIO(bwl,bw,type) \
|
|
static inline void out##bwl##_quad(unsigned type value, int port, int quad) { \
|
|
if (xquad_portio) \
|
|
write##bwl(value, XQUAD_PORT_ADDR(port, quad)); \
|
|
else \
|
|
out##bwl##_local(value, port); \
|
|
} \
|
|
static inline void out##bwl(unsigned type value, int port) { \
|
|
out##bwl##_quad(value, port, 0); \
|
|
} \
|
|
static inline unsigned type in##bwl##_quad(int port, int quad) { \
|
|
if (xquad_portio) \
|
|
return read##bwl(XQUAD_PORT_ADDR(port, quad)); \
|
|
else \
|
|
return in##bwl##_local(port); \
|
|
} \
|
|
static inline unsigned type in##bwl(int port) { \
|
|
return in##bwl##_quad(port, 0); \
|
|
}
|
|
#else
|
|
#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); \
|
|
}
|
|
#endif
|
|
|
|
|
|
#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
|