1/* 2 * linux/include/asm-arm/io.h 3 * 4 * Copyright (C) 1996-2000 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * Modifications: 11 * 16-Sep-1996 RMK Inlined the inx/outx functions & optimised for both 12 * constant addresses and variable addresses. 13 * 04-Dec-1997 RMK Moved a lot of this stuff to the new architecture 14 * specific IO header files. 15 * 27-Mar-1999 PJB Second parameter of memcpy_toio is const.. 16 * 04-Apr-1999 PJB Added check_signature. 17 * 12-Dec-1999 RMK More cleanups 18 * 18-Jun-2000 RMK Removed virt_to_* and friends definitions 19 */ 20#ifndef __ASM_ARM_IO_H 21#define __ASM_ARM_IO_H 22 23#ifdef __KERNEL__ 24 25#include <linux/types.h> 26#include <asm/memory.h> 27#include <asm/arch/hardware.h> 28 29/* 30 * Generic virtual read/write. Note that we don't support half-word 31 * read/writes. We define __arch_*[bl] here, and leave __arch_*w 32 * to the architecture specific code. 33 */ 34#define __arch_getb(a) (*(volatile unsigned char *)(a)) 35#define __arch_getl(a) (*(volatile unsigned int *)(a)) 36 37#define __arch_putb(v,a) (*(volatile unsigned char *)(a) = (v)) 38#define __arch_putl(v,a) (*(volatile unsigned int *)(a) = (v)) 39 40extern void __raw_writesb(unsigned int addr, const void *data, int bytelen); 41extern void __raw_writesw(unsigned int addr, const void *data, int wordlen); 42extern void __raw_writesl(unsigned int addr, const void *data, int longlen); 43 44extern void __raw_readsb(unsigned int addr, void *data, int bytelen); 45extern void __raw_readsw(unsigned int addr, void *data, int wordlen); 46extern void __raw_readsl(unsigned int addr, void *data, int longlen); 47 48#define __raw_writeb(v,a) __arch_putb(v,a) 49#define __raw_writew(v,a) __arch_putw(v,a) 50#define __raw_writel(v,a) __arch_putl(v,a) 51 52#define __raw_readb(a) __arch_getb(a) 53#define __raw_readw(a) __arch_getw(a) 54#define __raw_readl(a) __arch_getl(a) 55 56/* 57 * The compiler seems to be incapable of optimising constants 58 * properly. Spell it out to the compiler in some cases. 59 * These are only valid for small values of "off" (< 1<<12) 60 */ 61#define __raw_base_writeb(val,base,off) __arch_base_putb(val,base,off) 62#define __raw_base_writew(val,base,off) __arch_base_putw(val,base,off) 63#define __raw_base_writel(val,base,off) __arch_base_putl(val,base,off) 64 65#define __raw_base_readb(base,off) __arch_base_getb(base,off) 66#define __raw_base_readw(base,off) __arch_base_getw(base,off) 67#define __raw_base_readl(base,off) __arch_base_getl(base,off) 68 69/* 70 * Now, pick up the machine-defined IO definitions 71 */ 72#include <asm/arch/io.h> 73 74/* 75 * IO definitions. We define {out,in,outs,ins}[bwl] if __io is defined 76 * by the machine. Otherwise, these definitions are left for the machine 77 * specific header files to pick up. 78 * 79 * Note that we prevent GCC re-ordering or caching values in expressions 80 * by introducing sequence points into the in*() definitions. Note that 81 * __raw_* do not guarantee this behaviour. 82 */ 83#ifdef __io 84#define outb(v,p) __raw_writeb(v,__io(p)) 85#define outw(v,p) __raw_writew(v,__io(p)) 86#define outl(v,p) __raw_writel(v,__io(p)) 87 88#define inb(p) ({ unsigned int __v = __raw_readb(__io(p)); __v; }) 89#define inw(p) ({ unsigned int __v = __raw_readw(__io(p)); __v; }) 90#define inl(p) ({ unsigned int __v = __raw_readl(__io(p)); __v; }) 91 92#define outsb(p,d,l) __raw_writesb(__io(p),d,l) 93#define outsw(p,d,l) __raw_writesw(__io(p),d,l) 94#define outsl(p,d,l) __raw_writesl(__io(p),d,l) 95 96#define insb(p,d,l) __raw_readsb(__io(p),d,l) 97#define insw(p,d,l) __raw_readsw(__io(p),d,l) 98#define insl(p,d,l) __raw_readsl(__io(p),d,l) 99#endif 100 101#define outb_p(val,port) outb((val),(port)) 102#define outw_p(val,port) outw((val),(port)) 103#define outl_p(val,port) outl((val),(port)) 104#define inb_p(port) inb((port)) 105#define inw_p(port) inw((port)) 106#define inl_p(port) inl((port)) 107 108#define outsb_p(port,from,len) outsb(port,from,len) 109#define outsw_p(port,from,len) outsw(port,from,len) 110#define outsl_p(port,from,len) outsl(port,from,len) 111#define insb_p(port,to,len) insb(port,to,len) 112#define insw_p(port,to,len) insw(port,to,len) 113#define insl_p(port,to,len) insl(port,to,len) 114 115/* 116 * ioremap and friends. 117 * 118 * ioremap takes a PCI memory address, as specified in 119 * linux/Documentation/IO-mapping.txt. If you want a 120 * physical address, use __ioremap instead. 121 */ 122extern void * __ioremap(unsigned long offset, size_t size, unsigned long flags); 123extern void __iounmap(void *addr); 124 125/* 126 * Generic ioremap support. 127 * 128 * Define: 129 * iomem_valid_addr(off,size) 130 * iomem_to_phys(off) 131 */ 132#ifdef iomem_valid_addr 133#define __arch_ioremap(off,sz,nocache) \ 134 ({ \ 135 unsigned long _off = (off), _size = (sz); \ 136 void *_ret = (void *)0; \ 137 if (iomem_valid_addr(_off, _size)) \ 138 _ret = __ioremap(iomem_to_phys(_off),_size,0); \ 139 _ret; \ 140 }) 141 142#define __arch_iounmap __iounmap 143#endif 144 145#define ioremap(off,sz) __arch_ioremap((off),(sz),0) 146#define ioremap_nocache(off,sz) __arch_ioremap((off),(sz),1) 147#define iounmap(_addr) __arch_iounmap(_addr) 148 149/* 150 * DMA-consistent mapping functions. These allocate/free a region of 151 * uncached, unwrite-buffered mapped memory space for use with DMA 152 * devices. This is the "generic" version. The PCI specific version 153 * is in pci.h 154 */ 155extern void *consistent_alloc(int gfp, size_t size, dma_addr_t *handle); 156extern void consistent_free(void *vaddr, size_t size, dma_addr_t handle); 157extern void consistent_sync(void *vaddr, size_t size, int rw); 158 159/* 160 * String version of IO memory access ops: 161 */ 162extern void _memcpy_fromio(void *, unsigned long, size_t); 163extern void _memcpy_toio(unsigned long, const void *, size_t); 164extern void _memset_io(unsigned long, int, size_t); 165 166extern void __readwrite_bug(const char *fn); 167 168/* 169 * If this architecture has PCI memory IO, then define the read/write 170 * macros. These should only be used with the cookie passed from 171 * ioremap. 172 */ 173#ifdef __mem_pci 174 175#define readb(addr) ({ unsigned int __v = __raw_readb(__mem_pci(addr)); __v; }) 176#define readw(addr) ({ unsigned int __v = __raw_readw(__mem_pci(addr)); __v; }) 177#define readl(addr) ({ unsigned int __v = __raw_readl(__mem_pci(addr)); __v; }) 178 179#define writeb(val,addr) __raw_writeb(val,__mem_pci(addr)) 180#define writew(val,addr) __raw_writew(val,__mem_pci(addr)) 181#define writel(val,addr) __raw_writel(val,__mem_pci(addr)) 182 183#define memset_io(a,b,c) _memset_io(__mem_pci(a),(b),(c)) 184#define memcpy_fromio(a,b,c) _memcpy_fromio((a),__mem_pci(b),(c)) 185#define memcpy_toio(a,b,c) _memcpy_toio(__mem_pci(a),(b),(c)) 186 187#define eth_io_copy_and_sum(a,b,c,d) \ 188 eth_copy_and_sum((a),__mem_pci(b),(c),(d)) 189 190static inline int 191check_signature(unsigned long io_addr, const unsigned char *signature, 192 int length) 193{ 194 int retval = 0; 195 do { 196 if (readb(io_addr) != *signature) 197 goto out; 198 io_addr++; 199 signature++; 200 length--; 201 } while (length); 202 retval = 1; 203out: 204 return retval; 205} 206 207#elif !defined(readb) 208 209#define readb(addr) (__readwrite_bug("readb"),0) 210#define readw(addr) (__readwrite_bug("readw"),0) 211#define readl(addr) (__readwrite_bug("readl"),0) 212#define writeb(v,addr) __readwrite_bug("writeb") 213#define writew(v,addr) __readwrite_bug("writew") 214#define writel(v,addr) __readwrite_bug("writel") 215 216#define eth_io_copy_and_sum(a,b,c,d) __readwrite_bug("eth_io_copy_and_sum") 217 218#define check_signature(io,sig,len) (0) 219 220#endif /* __mem_pci */ 221 222/* 223 * remap a physical address `phys' of size `size' with page protection `prot' 224 * into virtual address `from' 225 */ 226#define io_remap_page_range(from,phys,size,prot) \ 227 remap_page_range(from,phys,size,prot) 228 229 230/* 231 * If this architecture has ISA IO, then define the isa_read/isa_write 232 * macros. 233 */ 234#ifdef __mem_isa 235 236#define isa_readb(addr) __raw_readb(__mem_isa(addr)) 237#define isa_readw(addr) __raw_readw(__mem_isa(addr)) 238#define isa_readl(addr) __raw_readl(__mem_isa(addr)) 239#define isa_writeb(val,addr) __raw_writeb(val,__mem_isa(addr)) 240#define isa_writew(val,addr) __raw_writew(val,__mem_isa(addr)) 241#define isa_writel(val,addr) __raw_writel(val,__mem_isa(addr)) 242#define isa_memset_io(a,b,c) _memset_io(__mem_isa(a),(b),(c)) 243#define isa_memcpy_fromio(a,b,c) _memcpy_fromio((a),__mem_isa(b),(c)) 244#define isa_memcpy_toio(a,b,c) _memcpy_toio(__mem_isa((a)),(b),(c)) 245 246#define isa_eth_io_copy_and_sum(a,b,c,d) \ 247 eth_copy_and_sum((a),__mem_isa(b),(c),(d)) 248 249static inline int 250isa_check_signature(unsigned long io_addr, const unsigned char *signature, 251 int length) 252{ 253 int retval = 0; 254 do { 255 if (isa_readb(io_addr) != *signature) 256 goto out; 257 io_addr++; 258 signature++; 259 length--; 260 } while (length); 261 retval = 1; 262out: 263 return retval; 264} 265 266#else /* __mem_isa */ 267 268#define isa_readb(addr) (__readwrite_bug("isa_readb"),0) 269#define isa_readw(addr) (__readwrite_bug("isa_readw"),0) 270#define isa_readl(addr) (__readwrite_bug("isa_readl"),0) 271#define isa_writeb(val,addr) __readwrite_bug("isa_writeb") 272#define isa_writew(val,addr) __readwrite_bug("isa_writew") 273#define isa_writel(val,addr) __readwrite_bug("isa_writel") 274#define isa_memset_io(a,b,c) __readwrite_bug("isa_memset_io") 275#define isa_memcpy_fromio(a,b,c) __readwrite_bug("isa_memcpy_fromio") 276#define isa_memcpy_toio(a,b,c) __readwrite_bug("isa_memcpy_toio") 277 278#define isa_eth_io_copy_and_sum(a,b,c,d) \ 279 __readwrite_bug("isa_eth_io_copy_and_sum") 280 281#define isa_check_signature(io,sig,len) (0) 282 283#endif /* __mem_isa */ 284#endif /* __KERNEL__ */ 285#endif /* __ASM_ARM_IO_H */ 286