/* * 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> #include <asm/arch/hardware.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(void __iomem *addr, void *data, int bytelen); extern void __raw_readsw(void __iomem *addr, void *data, int wordlen); extern void __raw_readsl(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)) /* * Bad read/write accesses... */ extern void __readwrite_bug(const char *fn); /* * Now, pick up the machine-defined IO definitions */ #include <asm/arch/io.h> #ifdef __io_pci #warning machine class uses buggy __io_pci #endif #if defined(__arch_putb) || defined(__arch_putw) || defined(__arch_putl) || \ defined(__arch_getb) || defined(__arch_getw) || defined(__arch_getl) #warning machine class uses old __arch_putw or __arch_getw #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) __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 *, void __iomem *, size_t); extern void _memcpy_toio(void __iomem *, const void *, size_t); extern void _memset_io(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)) #define eth_io_copy_and_sum(s,c,l,b) \ eth_copy_and_sum((s),__mem_pci(c),(l),(b)) static inline int check_signature(void __iomem *io_addr, const unsigned char *signature, int length) { int retval = 0; do { if (readb(io_addr) != *signature) goto out; io_addr++; signature++; length--; } while (length); retval = 1; out: return retval; } #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 eth_io_copy_and_sum(s,c,l,b) __readwrite_bug("eth_io_copy_and_sum") #define check_signature(io,sig,len) (0) #endif /* __mem_pci */ /* * If this architecture has ISA IO, then define the isa_read/isa_write * macros. */ #ifdef __mem_isa #define isa_readb(addr) __raw_readb(__mem_isa(addr)) #define isa_readw(addr) __raw_readw(__mem_isa(addr)) #define isa_readl(addr) __raw_readl(__mem_isa(addr)) #define isa_writeb(val,addr) __raw_writeb(val,__mem_isa(addr)) #define isa_writew(val,addr) __raw_writew(val,__mem_isa(addr)) #define isa_writel(val,addr) __raw_writel(val,__mem_isa(addr)) #define isa_memset_io(a,b,c) _memset_io(__mem_isa(a),(b),(c)) #define isa_memcpy_fromio(a,b,c) _memcpy_fromio((a),__mem_isa(b),(c)) #define isa_memcpy_toio(a,b,c) _memcpy_toio(__mem_isa((a)),(b),(c)) #define isa_eth_io_copy_and_sum(a,b,c,d) \ eth_copy_and_sum((a),__mem_isa(b),(c),(d)) #else /* __mem_isa */ #define isa_readb(addr) (__readwrite_bug("isa_readb"),0) #define isa_readw(addr) (__readwrite_bug("isa_readw"),0) #define isa_readl(addr) (__readwrite_bug("isa_readl"),0) #define isa_writeb(val,addr) __readwrite_bug("isa_writeb") #define isa_writew(val,addr) __readwrite_bug("isa_writew") #define isa_writel(val,addr) __readwrite_bug("isa_writel") #define isa_memset_io(a,b,c) __readwrite_bug("isa_memset_io") #define isa_memcpy_fromio(a,b,c) __readwrite_bug("isa_memcpy_fromio") #define isa_memcpy_toio(a,b,c) __readwrite_bug("isa_memcpy_toio") #define isa_eth_io_copy_and_sum(a,b,c,d) \ __readwrite_bug("isa_eth_io_copy_and_sum") #endif /* __mem_isa */ /* * ioremap and friends. * * ioremap takes a PCI memory address, as specified in * Documentation/IO-mapping.txt. */ extern void __iomem * __ioremap(unsigned long, size_t, unsigned long, unsigned long); extern void __iounmap(void __iomem *addr); #ifndef __arch_ioremap #define ioremap(cookie,size) __ioremap(cookie,size,0,1) #define ioremap_nocache(cookie,size) __ioremap(cookie,size,0,1) #define ioremap_cached(cookie,size) __ioremap(cookie,size,L_PTE_CACHEABLE,1) #define iounmap(cookie) __iounmap(cookie) #else #define ioremap(cookie,size) __arch_ioremap((cookie),(size),0,1) #define ioremap_nocache(cookie,size) __arch_ioremap((cookie),(size),0,1) #define ioremap_cached(cookie,size) __arch_ioremap((cookie),(size),L_PTE_CACHEABLE,1) #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(__raw_readw(p)); __v; }) #define ioread32(p) ({ unsigned int __v = le32_to_cpu(__raw_readl(p)); __v; }) #define iowrite8(v,p) __raw_writeb(v, p) #define iowrite16(v,p) __raw_writew(cpu_to_le16(v), p) #define iowrite32(v,p) __raw_writel(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))) /* * 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 #endif /* __KERNEL__ */ #endif /* __ASM_ARM_IO_H */