/* SPDX-License-Identifier: GPL-2.0-only */
/*
* arch / arm / include / asm / io . h
*
* Copyright ( C ) 1996 - 2000 Russell King
*
* 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/string.h>
#include <linux/types.h>
#include <asm /byteorder.h>
#include <asm /page.h>
#include <asm -generic/pci_iomap.h>
/*
* ISA I / O bus memory addresses are 1 : 1 with the physical address .
*/
#define isa_virt_to_bus virt_to_phys
#define isa_bus_to_virt phys_to_virt
/*
* Atomic MMIO - wide IO modify
*/
extern void atomic_io_modify(void __iomem *reg, u32 mask, u32 set);
extern void atomic_io_modify_relaxed(void __iomem *reg, u32 mask, u32 set);
/*
* Generic IO read / write . These perform native - endian accesses . Note
* that some architectures will want to re - define _ _ raw_ { read , write } w .
*/
void __raw_writesb(volatile void __iomem *addr, const void *data, int bytelen);
void __raw_writesw(volatile void __iomem *addr, const void *data, int wordlen);
void __raw_writesl(volatile void __iomem *addr, const void *data, int longlen);
void __raw_readsb(const volatile void __iomem *addr, void *data, int bytelen);
void __raw_readsw(const volatile void __iomem *addr, void *data, int wordlen);
void __raw_readsl(const volatile void __iomem *addr, void *data, int longlen);
#if __LINUX_ARM_ARCH__ < 6
/*
* Half - word accesses are problematic with RiscPC due to limitations of
* the bus . Rather than special - case the machine , just let the compiler
* generate the access for CPUs prior to ARMv6 .
*/
#define __raw_readw(a) (__chk_io_ptr(a), *(volatile unsigned short __force *)(a))
#define __raw_writew(v,a) ((void )(__chk_io_ptr(a), *(volatile unsigned short __force *)(a) = (v)))
#else
/*
* When running under a hypervisor , we want to avoid I / O accesses with
* writeback addressing modes as these incur a significant performance
* overhead ( the address generation must be emulated in software ) .
*/
#define __raw_writew __raw_writew
static inline void __raw_writew(u16 val, volatile void __iomem *addr)
{
asm volatile ("strh %1, %0"
: : "Q" (*(volatile u16 __force *)addr), "r" (val));
}
#define __raw_readw __raw_readw
static inline u16 __raw_readw(const volatile void __iomem *addr)
{
u16 val;
asm volatile ("ldrh %0, %1"
: "=r" (val)
: "Q" (*(volatile u16 __force *)addr));
return val;
}
#endif
#define __raw_writeb __raw_writeb
static inline void __raw_writeb(u8 val, volatile void __iomem *addr)
{
asm volatile ("strb %1, %0"
: : "Qo" (*(volatile u8 __force *)addr), "r" (val));
}
#define __raw_writel __raw_writel
static inline void __raw_writel(u32 val, volatile void __iomem *addr)
{
asm volatile ("str %1, %0"
: : "Qo" (*(volatile u32 __force *)addr), "r" (val));
}
#define __raw_readb __raw_readb
static inline u8 __raw_readb(const volatile void __iomem *addr)
{
u8 val;
asm volatile ("ldrb %0, %1"
: "=r" (val)
: "Qo" (*(volatile u8 __force *)addr));
return val;
}
#define __raw_readl __raw_readl
static inline u32 __raw_readl(const volatile void __iomem *addr)
{
u32 val;
asm volatile ("ldr %0, %1"
: "=r" (val)
: "Qo" (*(volatile u32 __force *)addr));
return val;
}
/*
* Architecture ioremap implementation .
*/
#define MT_DEVICE 0
#define MT_DEVICE_NONSHARED 1
#define MT_DEVICE_CACHED 2
#define MT_DEVICE_WC 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
* The _ caller variety takes a _ _ builtin_return_address ( 0 ) value for
* / proc / vmalloc to use - and should only be used in non - inline functions .
*/
extern void __iomem *__arm_ioremap_caller(phys_addr_t, size_t, unsigned int ,
void *);
extern void __iomem *__arm_ioremap_pfn(unsigned long , unsigned long , size_t, unsigned int );
extern void __iomem *__arm_ioremap_exec(phys_addr_t, size_t, bool cached);
void __arm_iomem_set_ro(void __iomem *ptr, size_t size);
extern void __iomem * (*arch_ioremap_caller)(phys_addr_t, size_t,
unsigned int , void *);
/*
* Bad read / write accesses . . .
*/
extern void __readwrite_bug(const char *fn);
/*
* A typesafe _ _ io ( ) helper
*/
static inline void __iomem *__typesafe_io(unsigned long addr)
{
return (void __iomem *)addr;
}
#define IOMEM(x) ((void __force __iomem *)(x))
/* IO barriers */
#ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE
#include <asm /barrier.h>
#define __iormb() rmb()
#define __iowmb() wmb()
#else
#define __iormb() do { } while (0 )
#define __iowmb() do { } while (0 )
#endif
/* PCI fixed i/o mapping */
#define PCI_IO_VIRT_BASE 0 xfee00000
#define PCI_IOBASE ((void __iomem *)PCI_IO_VIRT_BASE)
#if defined (CONFIG_PCI) || IS_ENABLED(CONFIG_PCMCIA)
void pci_ioremap_set_mem_type(int mem_type);
#else
static inline void pci_ioremap_set_mem_type(int mem_type) {}
#endif
struct resource;
#define pci_remap_iospace pci_remap_iospace
int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr);
/*
* PCI configuration space mapping function .
*
* The PCI specification does not allow configuration write
* transactions to be posted . Add an arch specific
* pci_remap_cfgspace ( ) definition that is implemented
* through strongly ordered memory mappings .
*/
#define pci_remap_cfgspace pci_remap_cfgspace
void __iomem *pci_remap_cfgspace(resource_size_t res_cookie, size_t size);
/*
* Now , pick up the machine - defined IO definitions
*/
#ifdef CONFIG_NEED_MACH_IO_H
#include <mach/io.h>
#else
#if IS_ENABLED(CONFIG_PCMCIA) || defined (CONFIG_PCI)
#define IO_SPACE_LIMIT ((resource_size_t)0 xfffff)
#else
#define IO_SPACE_LIMIT ((resource_size_t)0 )
#endif
#define __io(a) __typesafe_io(PCI_IO_VIRT_BASE + ((a) & IO_SPACE_LIMIT))
#endif
/*
* 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) ({ __iowmb(); __raw_writeb(v,__io(p)); })
#define outw(v,p) ({ __iowmb(); __raw_writew((__force __u16) \
cpu_to_le16(v),__io(p)); })
#define outl(v,p) ({ __iowmb(); __raw_writel((__force __u32) \
cpu_to_le32(v),__io(p)); })
#define inb(p) ({ __u8 __v = __raw_readb(__io(p)); __iormb(); __v; })
#define inw(p) ({ __u16 __v = le16_to_cpu((__force __le16) \
__raw_readw(__io(p))); __iormb(); __v; })
#define inl(p) ({ __u32 __v = le32_to_cpu((__force __le32) \
__raw_readl(__io(p))); __iormb(); __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
/*
* 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);
/*
* Memory access primitives
* - - - - - - - - - - - - - - - - - - - - - - - -
*
* These perform PCI memory accesses via an ioremap region . They don ' t
* take an address as such , but a cookie .
*
* Again , these are defined to perform little endian accesses . See the
* IO port primitives for more information .
*/
#ifndef readl
#define readb_relaxed(c) ({ u8 __r = __raw_readb(c); __r; })
#define readw_relaxed(c) ({ u16 __r = le16_to_cpu((__force __le16) \
__raw_readw(c)); __r; })
#define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32) \
__raw_readl(c)); __r; })
#define writeb_relaxed(v,c) __raw_writeb(v,c)
#define writew_relaxed(v,c) __raw_writew((__force u16) cpu_to_le16(v),c)
#define writel_relaxed(v,c) __raw_writel((__force u32) cpu_to_le32(v),c)
#define readb(c) ({ u8 __v = readb_relaxed(c); __iormb(); __v; })
#define readw(c) ({ u16 __v = readw_relaxed(c); __iormb(); __v; })
#define readl(c) ({ u32 __v = readl_relaxed(c); __iormb(); __v; })
#define writeb(v,c) ({ __iowmb(); writeb_relaxed(v,c); })
#define writew(v,c) ({ __iowmb(); writew_relaxed(v,c); })
#define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); })
#define readsb(p,d,l) __raw_readsb(p,d,l)
#define readsw(p,d,l) __raw_readsw(p,d,l)
#define readsl(p,d,l) __raw_readsl(p,d,l)
#define writesb(p,d,l) __raw_writesb(p,d,l)
#define writesw(p,d,l) __raw_writesw(p,d,l)
#define writesl(p,d,l) __raw_writesl(p,d,l)
#ifndef __ARMBE__
static inline void memset_io(volatile void __iomem *dst, unsigned c,
size_t count)
{
extern void mmioset(void *, unsigned int , size_t);
mmioset((void __force *)dst, c, count);
}
#define memset_io(dst,c,count) memset_io(dst,c,count)
static inline void memcpy_fromio(void *to, const volatile void __iomem *from,
size_t count)
{
extern void mmiocpy(void *, const void *, size_t);
mmiocpy(to, (const void __force *)from, count);
}
#define memcpy_fromio(to,from,count) memcpy_fromio(to,from,count)
static inline void memcpy_toio(volatile void __iomem *to, const void *from,
size_t count)
{
extern void mmiocpy(void *, const void *, size_t);
mmiocpy((void __force *)to, from, count);
}
#define memcpy_toio(to,from,count) memcpy_toio(to,from,count)
#else
#define memset_io(c,v,l) _memset_io(c,(v),(l))
#define memcpy_fromio(a,c,l) _memcpy_fromio((a),c,(l))
#define memcpy_toio(c,a,l) _memcpy_toio(c,(a),(l))
#endif
#endif /* readl */
/*
* ioremap ( ) and friends .
*
* ioremap ( ) takes a resource address , and size . Due to the ARM memory
* types , it is important to use the correct ioremap ( ) function as each
* mapping has specific properties .
*
* Function Memory type Cacheability Cache hint
* ioremap ( ) Device n / a n / a
* ioremap_cache ( ) Normal Writeback Read allocate
* ioremap_wc ( ) Normal Non - cacheable n / a
* ioremap_wt ( ) Normal Non - cacheable n / a
*
* All device mappings have the following properties :
* - no access speculation
* - no repetition ( eg , on return from an exception )
* - number , order and size of accesses are maintained
* - unaligned accesses are " unpredictable "
* - writes may be delayed before they hit the endpoint device
*
* All normal memory mappings have the following properties :
* - reads can be repeated with no side effects
* - repeated reads return the last value written
* - reads can fetch additional locations without side effects
* - writes can be repeated ( in certain cases ) with no side effects
* - writes can be merged before accessing the target
* - unaligned accesses can be supported
* - ordering is not guaranteed without explicit dependencies or barrier
* instructions
* - writes may be delayed before they hit the endpoint memory
*
* The cache hint is only a performance hint : CPUs may alias these hints .
* Eg , a CPU not implementing read allocate but implementing write allocate
* will provide a write allocate mapping instead .
*/
void __iomem *ioremap(resource_size_t res_cookie, size_t size);
#define ioremap ioremap
/*
* Do not use ioremap_cache for mapping memory . Use memremap instead .
*/
void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size);
#define ioremap_cache ioremap_cache
void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size);
#define ioremap_wc ioremap_wc
#define ioremap_wt ioremap_wc
void iounmap(volatile void __iomem *io_addr);
#define iounmap iounmap
void *arch_memremap_wb(phys_addr_t phys_addr, size_t size, unsigned long flags);
#define arch_memremap_wb arch_memremap_wb
/*
* io { read , write } { 16 , 32 } be ( ) macros
*/
#define ioread16be(p) ({ __u16 __v = be16_to_cpu((__force __be16)__raw_readw(p)); __iormb(); __v; })
#define ioread32be(p) ({ __u32 __v = be32_to_cpu((__force __be32)__raw_readl(p)); __iormb(); __v; })
#define iowrite16be(v,p) ({ __iowmb(); __raw_writew((__force __u16)cpu_to_be16(v), p); })
#define iowrite32be(v,p) ({ __iowmb(); __raw_writel((__force __u32)cpu_to_be32(v), p); })
#ifndef ioport_map
#define ioport_map ioport_map
extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
#endif
#ifndef ioport_unmap
#define ioport_unmap ioport_unmap
extern void ioport_unmap(void __iomem *addr);
#endif
struct pci_dev;
#define pci_iounmap pci_iounmap
extern void pci_iounmap(struct pci_dev *dev, void __iomem *addr);
#include <asm -generic/io.h>
#ifdef CONFIG_MMU
#define ARCH_HAS_VALID_PHYS_ADDR_RANGE
extern int valid_phys_addr_range(phys_addr_t addr, size_t size);
extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);
extern bool arch_memremap_can_ram_remap(resource_size_t offset, size_t size,
unsigned long flags);
#define arch_memremap_can_ram_remap arch_memremap_can_ram_remap
#endif
/*
* 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 */
Messung V0.5 in Prozent C=95 H=89 G=91
¤ Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.0.2Bemerkung:
(vorverarbeitet am 2026-09-29)
¤
*© Formatika GbR, Deutschland