include/asm-i386/io.h - kernel/msm-4.9 - Gitiles

 #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))

 /*
  * Again, i386 does not require mem IO specific function.
  */

 #define eth_io_copy_and_sum(a,b,c,d)		eth_copy_and_sum((a),(void __force *)(b),(c),(d))

 /*
  *	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__ */

 #if defined(CONFIG_PARAVIRT)
 #include <asm/paravirt.h>
 #else

 #define __SLOW_DOWN_IO "outb %%al,$0x80;"

 static inline void slow_down_io(void) {
 	__asm__ __volatile__(
 		__SLOW_DOWN_IO
 #ifdef REALLY_SLOW_IO
 		__SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
 #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
	#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))

	/*
	* Again, i386 does not require mem IO specific function.
	*/

	#define eth_io_copy_and_sum(a,b,c,d) eth_copy_and_sum((a),(void __force *)(b),(c),(d))

	/*
	* 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__ */

	#if defined(CONFIG_PARAVIRT)
	#include <asm/paravirt.h>
	#else

	#define __SLOW_DOWN_IO "outb %%al,$0x80;"

	static inline void slow_down_io(void) {
	__asm__ __volatile__(
	__SLOW_DOWN_IO
	#ifdef REALLY_SLOW_IO
	__SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
	#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