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io.h
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io.h
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/*
* linux/include/asm-arm/io.h
*
* Copyright (C) 1996-2000 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Modifications:
* 16-Sep-1996 RMK Inlined the inx/outx functions & optimised for both
* constant addresses and variable addresses.
* 04-Dec-1997 RMK Moved a lot of this stuff to the new architecture
* specific IO header files.
* 27-Mar-1999 PJB Second parameter of memcpy_toio is const..
* 04-Apr-1999 PJB Added check_signature.
* 12-Dec-1999 RMK More cleanups
* 18-Jun-2000 RMK Removed virt_to_* and friends definitions
* 05-Oct-2004 BJD Moved memory string functions to use void __iomem
*/
#ifndef __ASM_ARM_IO_H
#define __ASM_ARM_IO_H
#ifdef __KERNEL__
#include <linux/types.h>
#include <asm/byteorder.h>
#include <asm/memory.h>
/*
* 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
/*
* Generic IO read/write. These perform native-endian accesses. Note
* that some architectures will want to re-define __raw_{read,write}w.
*/
extern void __raw_writesb(void __iomem *addr, const void *data, int bytelen);
extern void __raw_writesw(void __iomem *addr, const void *data, int wordlen);
extern void __raw_writesl(void __iomem *addr, const void *data, int longlen);
extern void __raw_readsb(const void __iomem *addr, void *data, int bytelen);
extern void __raw_readsw(const void __iomem *addr, void *data, int wordlen);
extern void __raw_readsl(const void __iomem *addr, void *data, int longlen);
#define __raw_writeb(v,a) (__chk_io_ptr(a), *(volatile unsigned char __force *)(a) = (v))
#define __raw_writew(v,a) (__chk_io_ptr(a), *(volatile unsigned short __force *)(a) = (v))
#define __raw_writel(v,a) (__chk_io_ptr(a), *(volatile unsigned int __force *)(a) = (v))
#define __raw_readb(a) (__chk_io_ptr(a), *(volatile unsigned char __force *)(a))
#define __raw_readw(a) (__chk_io_ptr(a), *(volatile unsigned short __force *)(a))
#define __raw_readl(a) (__chk_io_ptr(a), *(volatile unsigned int __force *)(a))
/*
* Architecture ioremap implementation.
*/
#define MT_DEVICE 0
#define MT_DEVICE_NONSHARED 1
#define MT_DEVICE_CACHED 2
#define MT_DEVICE_IXP2000 3
/*
* types 4 onwards can be found in asm/mach/map.h and are undefined
* for ioremap
*/
/*
* __arm_ioremap takes CPU physical address.
* __arm_ioremap_pfn takes a Page Frame Number and an offset into that page
*/
extern void __iomem * __arm_ioremap_pfn(unsigned long, unsigned long, size_t, unsigned int);
extern void __iomem * __arm_ioremap(unsigned long, size_t, unsigned int);
extern void __iounmap(volatile void __iomem *addr);
/*
* Bad read/write accesses...
*/
extern void __readwrite_bug(const char *fn);
/*
* Now, pick up the machine-defined IO definitions
*/
#include <asm/arch/io.h>
/*
* IO port access primitives
* -------------------------
*
* The ARM doesn't have special IO access instructions; all IO is memory
* mapped. Note that these are defined to perform little endian accesses
* only. Their primary purpose is to access PCI and ISA peripherals.
*
* Note that for a big endian machine, this implies that the following
* big endian mode connectivity is in place, as described by numerous
* ARM documents:
*
* PCI: D0-D7 D8-D15 D16-D23 D24-D31
* ARM: D24-D31 D16-D23 D8-D15 D0-D7
*
* The machine specific io.h include defines __io to translate an "IO"
* address to a memory address.
*
* Note that we prevent GCC re-ordering or caching values in expressions
* by introducing sequence points into the in*() definitions. Note that
* __raw_* do not guarantee this behaviour.
*
* The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
*/
#ifdef __io
#define outb(v,p) __raw_writeb(v,__io(p))
#define outw(v,p) __raw_writew((__force __u16) \
cpu_to_le16(v),__io(p))
#define outl(v,p) __raw_writel((__force __u32) \
cpu_to_le32(v),__io(p))
#define inb(p) ({ __u8 __v = __raw_readb(__io(p)); __v; })
#define inw(p) ({ __u16 __v = le16_to_cpu((__force __le16) \
__raw_readw(__io(p))); __v; })
#define inl(p) ({ __u32 __v = le32_to_cpu((__force __le32) \
__raw_readl(__io(p))); __v; })
#define outsb(p,d,l) __raw_writesb(__io(p),d,l)
#define outsw(p,d,l) __raw_writesw(__io(p),d,l)
#define outsl(p,d,l) __raw_writesl(__io(p),d,l)
#define insb(p,d,l) __raw_readsb(__io(p),d,l)
#define insw(p,d,l) __raw_readsw(__io(p),d,l)
#define insl(p,d,l) __raw_readsl(__io(p),d,l)
#endif
#define outb_p(val,port) outb((val),(port))
#define outw_p(val,port) outw((val),(port))
#define outl_p(val,port) outl((val),(port))
#define inb_p(port) inb((port))
#define inw_p(port) inw((port))
#define inl_p(port) inl((port))
#define outsb_p(port,from,len) outsb(port,from,len)
#define outsw_p(port,from,len) outsw(port,from,len)
#define outsl_p(port,from,len) outsl(port,from,len)
#define insb_p(port,to,len) insb(port,to,len)
#define insw_p(port,to,len) insw(port,to,len)
#define insl_p(port,to,len) insl(port,to,len)
/*
* String version of IO memory access ops:
*/
extern void _memcpy_fromio(void *, const volatile void __iomem *, size_t);
extern void _memcpy_toio(volatile void __iomem *, const void *, size_t);
extern void _memset_io(volatile void __iomem *, int, size_t);
#define mmiowb()
/*
* Memory access primitives
* ------------------------
*
* These perform PCI memory accesses via an ioremap region. They don't
* take an address as such, but a cookie.
*
* Again, this are defined to perform little endian accesses. See the
* IO port primitives for more information.
*/
#ifdef __mem_pci
#define readb(c) ({ __u8 __v = __raw_readb(__mem_pci(c)); __v; })
#define readw(c) ({ __u16 __v = le16_to_cpu((__force __le16) \
__raw_readw(__mem_pci(c))); __v; })
#define readl(c) ({ __u32 __v = le32_to_cpu((__force __le32) \
__raw_readl(__mem_pci(c))); __v; })
#define readb_relaxed(addr) readb(addr)
#define readw_relaxed(addr) readw(addr)
#define readl_relaxed(addr) readl(addr)
#define readsb(p,d,l) __raw_readsb(__mem_pci(p),d,l)
#define readsw(p,d,l) __raw_readsw(__mem_pci(p),d,l)
#define readsl(p,d,l) __raw_readsl(__mem_pci(p),d,l)
#define writeb(v,c) __raw_writeb(v,__mem_pci(c))
#define writew(v,c) __raw_writew((__force __u16) \
cpu_to_le16(v),__mem_pci(c))
#define writel(v,c) __raw_writel((__force __u32) \
cpu_to_le32(v),__mem_pci(c))
#define writesb(p,d,l) __raw_writesb(__mem_pci(p),d,l)
#define writesw(p,d,l) __raw_writesw(__mem_pci(p),d,l)
#define writesl(p,d,l) __raw_writesl(__mem_pci(p),d,l)
#define memset_io(c,v,l) _memset_io(__mem_pci(c),(v),(l))
#define memcpy_fromio(a,c,l) _memcpy_fromio((a),__mem_pci(c),(l))
#define memcpy_toio(c,a,l) _memcpy_toio(__mem_pci(c),(a),(l))
#elif !defined(readb)
#define readb(c) (__readwrite_bug("readb"),0)
#define readw(c) (__readwrite_bug("readw"),0)
#define readl(c) (__readwrite_bug("readl"),0)
#define writeb(v,c) __readwrite_bug("writeb")
#define writew(v,c) __readwrite_bug("writew")
#define writel(v,c) __readwrite_bug("writel")
#define check_signature(io,sig,len) (0)
#endif /* __mem_pci */
/*
* ioremap and friends.
*
* ioremap takes a PCI memory address, as specified in
* Documentation/IO-mapping.txt.
*
*/
#ifndef __arch_ioremap
#define ioremap(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE)
#define ioremap_nocache(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE)
#define ioremap_cached(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE_CACHED)
#define iounmap(cookie) __iounmap(cookie)
#else
#define ioremap(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE)
#define ioremap_nocache(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE)
#define ioremap_cached(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE_CACHED)
#define iounmap(cookie) __arch_iounmap(cookie)
#endif
/*
* io{read,write}{8,16,32} macros
*/
#ifndef ioread8
#define ioread8(p) ({ unsigned int __v = __raw_readb(p); __v; })
#define ioread16(p) ({ unsigned int __v = le16_to_cpu((__force __le16)__raw_readw(p)); __v; })
#define ioread32(p) ({ unsigned int __v = le32_to_cpu((__force __le32)__raw_readl(p)); __v; })
#define iowrite8(v,p) __raw_writeb(v, p)
#define iowrite16(v,p) __raw_writew((__force __u16)cpu_to_le16(v), p)
#define iowrite32(v,p) __raw_writel((__force __u32)cpu_to_le32(v), p)
#define ioread8_rep(p,d,c) __raw_readsb(p,d,c)
#define ioread16_rep(p,d,c) __raw_readsw(p,d,c)
#define ioread32_rep(p,d,c) __raw_readsl(p,d,c)
#define iowrite8_rep(p,s,c) __raw_writesb(p,s,c)
#define iowrite16_rep(p,s,c) __raw_writesw(p,s,c)
#define iowrite32_rep(p,s,c) __raw_writesl(p,s,c)
extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
extern void ioport_unmap(void __iomem *addr);
#endif
struct pci_dev;
extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen);
extern void pci_iounmap(struct pci_dev *dev, void __iomem *addr);
/*
* can the hardware map this into one segment or not, given no other
* constraints.
*/
#define BIOVEC_MERGEABLE(vec1, vec2) \
((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
#ifdef CONFIG_MMU
#define ARCH_HAS_VALID_PHYS_ADDR_RANGE
extern int valid_phys_addr_range(unsigned long addr, size_t size);
extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);
#endif
/*
* 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
/*
* Register ISA memory and port locations for glibc iopl/inb/outb
* emulation.
*/
extern void register_isa_ports(unsigned int mmio, unsigned int io,
unsigned int io_shift);
#endif /* __KERNEL__ */
#endif /* __ASM_ARM_IO_H */