1 /* 2 * arch/arm/include/asm/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 * 05-Oct-2004 BJD Moved memory string functions to use void __iomem 20 */ 21 #ifndef __ASM_ARM_IO_H 22 #define __ASM_ARM_IO_H 23 24 #ifdef __KERNEL__ 25 26 #include <linux/types.h> 27 #include <linux/blk_types.h> 28 #include <asm/byteorder.h> 29 #include <asm/memory.h> 30 #include <asm-generic/pci_iomap.h> 31 #include <xen/xen.h> 32 33 /* 34 * ISA I/O bus memory addresses are 1:1 with the physical address. 35 */ 36 #define isa_virt_to_bus virt_to_phys 37 #define isa_page_to_bus page_to_phys 38 #define isa_bus_to_virt phys_to_virt 39 40 /* 41 * Atomic MMIO-wide IO modify 42 */ 43 extern void atomic_io_modify(void __iomem *reg, u32 mask, u32 set); 44 extern void atomic_io_modify_relaxed(void __iomem *reg, u32 mask, u32 set); 45 46 /* 47 * Generic IO read/write. These perform native-endian accesses. Note 48 * that some architectures will want to re-define __raw_{read,write}w. 49 */ 50 extern void __raw_writesb(void __iomem *addr, const void *data, int bytelen); 51 extern void __raw_writesw(void __iomem *addr, const void *data, int wordlen); 52 extern void __raw_writesl(void __iomem *addr, const void *data, int longlen); 53 54 extern void __raw_readsb(const void __iomem *addr, void *data, int bytelen); 55 extern void __raw_readsw(const void __iomem *addr, void *data, int wordlen); 56 extern void __raw_readsl(const void __iomem *addr, void *data, int longlen); 57 58 #if __LINUX_ARM_ARCH__ < 6 59 /* 60 * Half-word accesses are problematic with RiscPC due to limitations of 61 * the bus. Rather than special-case the machine, just let the compiler 62 * generate the access for CPUs prior to ARMv6. 63 */ 64 #define __raw_readw(a) (__chk_io_ptr(a), *(volatile unsigned short __force *)(a)) 65 #define __raw_writew(v,a) ((void)(__chk_io_ptr(a), *(volatile unsigned short __force *)(a) = (v))) 66 #else 67 /* 68 * When running under a hypervisor, we want to avoid I/O accesses with 69 * writeback addressing modes as these incur a significant performance 70 * overhead (the address generation must be emulated in software). 71 */ 72 static inline void __raw_writew(u16 val, volatile void __iomem *addr) 73 { 74 asm volatile("strh %1, %0" 75 : "+Q" (*(volatile u16 __force *)addr) 76 : "r" (val)); 77 } 78 79 static inline u16 __raw_readw(const volatile void __iomem *addr) 80 { 81 u16 val; 82 asm volatile("ldrh %1, %0" 83 : "+Q" (*(volatile u16 __force *)addr), 84 "=r" (val)); 85 return val; 86 } 87 #endif 88 89 static inline void __raw_writeb(u8 val, volatile void __iomem *addr) 90 { 91 asm volatile("strb %1, %0" 92 : "+Qo" (*(volatile u8 __force *)addr) 93 : "r" (val)); 94 } 95 96 static inline void __raw_writel(u32 val, volatile void __iomem *addr) 97 { 98 asm volatile("str %1, %0" 99 : "+Qo" (*(volatile u32 __force *)addr) 100 : "r" (val)); 101 } 102 103 static inline u8 __raw_readb(const volatile void __iomem *addr) 104 { 105 u8 val; 106 asm volatile("ldrb %1, %0" 107 : "+Qo" (*(volatile u8 __force *)addr), 108 "=r" (val)); 109 return val; 110 } 111 112 static inline u32 __raw_readl(const volatile void __iomem *addr) 113 { 114 u32 val; 115 asm volatile("ldr %1, %0" 116 : "+Qo" (*(volatile u32 __force *)addr), 117 "=r" (val)); 118 return val; 119 } 120 121 /* 122 * Architecture ioremap implementation. 123 */ 124 #define MT_DEVICE 0 125 #define MT_DEVICE_NONSHARED 1 126 #define MT_DEVICE_CACHED 2 127 #define MT_DEVICE_WC 3 128 /* 129 * types 4 onwards can be found in asm/mach/map.h and are undefined 130 * for ioremap 131 */ 132 133 /* 134 * __arm_ioremap takes CPU physical address. 135 * __arm_ioremap_pfn takes a Page Frame Number and an offset into that page 136 * The _caller variety takes a __builtin_return_address(0) value for 137 * /proc/vmalloc to use - and should only be used in non-inline functions. 138 */ 139 extern void __iomem *__arm_ioremap_pfn_caller(unsigned long, unsigned long, 140 size_t, unsigned int, void *); 141 extern void __iomem *__arm_ioremap_caller(phys_addr_t, size_t, unsigned int, 142 void *); 143 144 extern void __iomem *__arm_ioremap_pfn(unsigned long, unsigned long, size_t, unsigned int); 145 extern void __iomem *__arm_ioremap(phys_addr_t, size_t, unsigned int); 146 extern void __iomem *__arm_ioremap_exec(phys_addr_t, size_t, bool cached); 147 extern void __iounmap(volatile void __iomem *addr); 148 extern void __arm_iounmap(volatile void __iomem *addr); 149 150 extern void __iomem * (*arch_ioremap_caller)(phys_addr_t, size_t, 151 unsigned int, void *); 152 extern void (*arch_iounmap)(volatile void __iomem *); 153 154 /* 155 * Bad read/write accesses... 156 */ 157 extern void __readwrite_bug(const char *fn); 158 159 /* 160 * A typesafe __io() helper 161 */ 162 static inline void __iomem *__typesafe_io(unsigned long addr) 163 { 164 return (void __iomem *)addr; 165 } 166 167 #define IOMEM(x) ((void __force __iomem *)(x)) 168 169 /* IO barriers */ 170 #ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE 171 #include <asm/barrier.h> 172 #define __iormb() rmb() 173 #define __iowmb() wmb() 174 #else 175 #define __iormb() do { } while (0) 176 #define __iowmb() do { } while (0) 177 #endif 178 179 /* PCI fixed i/o mapping */ 180 #define PCI_IO_VIRT_BASE 0xfee00000 181 182 extern int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr); 183 184 /* 185 * Now, pick up the machine-defined IO definitions 186 */ 187 #ifdef CONFIG_NEED_MACH_IO_H 188 #include <mach/io.h> 189 #elif defined(CONFIG_PCI) 190 #define IO_SPACE_LIMIT ((resource_size_t)0xfffff) 191 #define __io(a) __typesafe_io(PCI_IO_VIRT_BASE + ((a) & IO_SPACE_LIMIT)) 192 #else 193 #define __io(a) __typesafe_io((a) & IO_SPACE_LIMIT) 194 #endif 195 196 /* 197 * This is the limit of PC card/PCI/ISA IO space, which is by default 198 * 64K if we have PC card, PCI or ISA support. Otherwise, default to 199 * zero to prevent ISA/PCI drivers claiming IO space (and potentially 200 * oopsing.) 201 * 202 * Only set this larger if you really need inb() et.al. to operate over 203 * a larger address space. Note that SOC_COMMON ioremaps each sockets 204 * IO space area, and so inb() et.al. must be defined to operate as per 205 * readb() et.al. on such platforms. 206 */ 207 #ifndef IO_SPACE_LIMIT 208 #if defined(CONFIG_PCMCIA_SOC_COMMON) || defined(CONFIG_PCMCIA_SOC_COMMON_MODULE) 209 #define IO_SPACE_LIMIT ((resource_size_t)0xffffffff) 210 #elif defined(CONFIG_PCI) || defined(CONFIG_ISA) || defined(CONFIG_PCCARD) 211 #define IO_SPACE_LIMIT ((resource_size_t)0xffff) 212 #else 213 #define IO_SPACE_LIMIT ((resource_size_t)0) 214 #endif 215 #endif 216 217 /* 218 * IO port access primitives 219 * ------------------------- 220 * 221 * The ARM doesn't have special IO access instructions; all IO is memory 222 * mapped. Note that these are defined to perform little endian accesses 223 * only. Their primary purpose is to access PCI and ISA peripherals. 224 * 225 * Note that for a big endian machine, this implies that the following 226 * big endian mode connectivity is in place, as described by numerous 227 * ARM documents: 228 * 229 * PCI: D0-D7 D8-D15 D16-D23 D24-D31 230 * ARM: D24-D31 D16-D23 D8-D15 D0-D7 231 * 232 * The machine specific io.h include defines __io to translate an "IO" 233 * address to a memory address. 234 * 235 * Note that we prevent GCC re-ordering or caching values in expressions 236 * by introducing sequence points into the in*() definitions. Note that 237 * __raw_* do not guarantee this behaviour. 238 * 239 * The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space. 240 */ 241 #ifdef __io 242 #define outb(v,p) ({ __iowmb(); __raw_writeb(v,__io(p)); }) 243 #define outw(v,p) ({ __iowmb(); __raw_writew((__force __u16) \ 244 cpu_to_le16(v),__io(p)); }) 245 #define outl(v,p) ({ __iowmb(); __raw_writel((__force __u32) \ 246 cpu_to_le32(v),__io(p)); }) 247 248 #define inb(p) ({ __u8 __v = __raw_readb(__io(p)); __iormb(); __v; }) 249 #define inw(p) ({ __u16 __v = le16_to_cpu((__force __le16) \ 250 __raw_readw(__io(p))); __iormb(); __v; }) 251 #define inl(p) ({ __u32 __v = le32_to_cpu((__force __le32) \ 252 __raw_readl(__io(p))); __iormb(); __v; }) 253 254 #define outsb(p,d,l) __raw_writesb(__io(p),d,l) 255 #define outsw(p,d,l) __raw_writesw(__io(p),d,l) 256 #define outsl(p,d,l) __raw_writesl(__io(p),d,l) 257 258 #define insb(p,d,l) __raw_readsb(__io(p),d,l) 259 #define insw(p,d,l) __raw_readsw(__io(p),d,l) 260 #define insl(p,d,l) __raw_readsl(__io(p),d,l) 261 #endif 262 263 #define outb_p(val,port) outb((val),(port)) 264 #define outw_p(val,port) outw((val),(port)) 265 #define outl_p(val,port) outl((val),(port)) 266 #define inb_p(port) inb((port)) 267 #define inw_p(port) inw((port)) 268 #define inl_p(port) inl((port)) 269 270 #define outsb_p(port,from,len) outsb(port,from,len) 271 #define outsw_p(port,from,len) outsw(port,from,len) 272 #define outsl_p(port,from,len) outsl(port,from,len) 273 #define insb_p(port,to,len) insb(port,to,len) 274 #define insw_p(port,to,len) insw(port,to,len) 275 #define insl_p(port,to,len) insl(port,to,len) 276 277 /* 278 * String version of IO memory access ops: 279 */ 280 extern void _memcpy_fromio(void *, const volatile void __iomem *, size_t); 281 extern void _memcpy_toio(volatile void __iomem *, const void *, size_t); 282 extern void _memset_io(volatile void __iomem *, int, size_t); 283 284 #define mmiowb() 285 286 /* 287 * Memory access primitives 288 * ------------------------ 289 * 290 * These perform PCI memory accesses via an ioremap region. They don't 291 * take an address as such, but a cookie. 292 * 293 * Again, this are defined to perform little endian accesses. See the 294 * IO port primitives for more information. 295 */ 296 #ifndef readl 297 #define readb_relaxed(c) ({ u8 __r = __raw_readb(c); __r; }) 298 #define readw_relaxed(c) ({ u16 __r = le16_to_cpu((__force __le16) \ 299 __raw_readw(c)); __r; }) 300 #define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32) \ 301 __raw_readl(c)); __r; }) 302 303 #define writeb_relaxed(v,c) __raw_writeb(v,c) 304 #define writew_relaxed(v,c) __raw_writew((__force u16) cpu_to_le16(v),c) 305 #define writel_relaxed(v,c) __raw_writel((__force u32) cpu_to_le32(v),c) 306 307 #define readb(c) ({ u8 __v = readb_relaxed(c); __iormb(); __v; }) 308 #define readw(c) ({ u16 __v = readw_relaxed(c); __iormb(); __v; }) 309 #define readl(c) ({ u32 __v = readl_relaxed(c); __iormb(); __v; }) 310 311 #define writeb(v,c) ({ __iowmb(); writeb_relaxed(v,c); }) 312 #define writew(v,c) ({ __iowmb(); writew_relaxed(v,c); }) 313 #define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); }) 314 315 #define readsb(p,d,l) __raw_readsb(p,d,l) 316 #define readsw(p,d,l) __raw_readsw(p,d,l) 317 #define readsl(p,d,l) __raw_readsl(p,d,l) 318 319 #define writesb(p,d,l) __raw_writesb(p,d,l) 320 #define writesw(p,d,l) __raw_writesw(p,d,l) 321 #define writesl(p,d,l) __raw_writesl(p,d,l) 322 323 #define memset_io(c,v,l) _memset_io(c,(v),(l)) 324 #define memcpy_fromio(a,c,l) _memcpy_fromio((a),c,(l)) 325 #define memcpy_toio(c,a,l) _memcpy_toio(c,(a),(l)) 326 327 #endif /* readl */ 328 329 /* 330 * ioremap and friends. 331 * 332 * ioremap takes a PCI memory address, as specified in 333 * Documentation/io-mapping.txt. 334 * 335 */ 336 #define ioremap(cookie,size) __arm_ioremap((cookie), (size), MT_DEVICE) 337 #define ioremap_nocache(cookie,size) __arm_ioremap((cookie), (size), MT_DEVICE) 338 #define ioremap_cache(cookie,size) __arm_ioremap((cookie), (size), MT_DEVICE_CACHED) 339 #define ioremap_wc(cookie,size) __arm_ioremap((cookie), (size), MT_DEVICE_WC) 340 #define iounmap __arm_iounmap 341 342 /* 343 * io{read,write}{8,16,32} macros 344 */ 345 #ifndef ioread8 346 #define ioread8(p) ({ unsigned int __v = __raw_readb(p); __iormb(); __v; }) 347 #define ioread16(p) ({ unsigned int __v = le16_to_cpu((__force __le16)__raw_readw(p)); __iormb(); __v; }) 348 #define ioread32(p) ({ unsigned int __v = le32_to_cpu((__force __le32)__raw_readl(p)); __iormb(); __v; }) 349 350 #define ioread16be(p) ({ unsigned int __v = be16_to_cpu((__force __be16)__raw_readw(p)); __iormb(); __v; }) 351 #define ioread32be(p) ({ unsigned int __v = be32_to_cpu((__force __be32)__raw_readl(p)); __iormb(); __v; }) 352 353 #define iowrite8(v,p) ({ __iowmb(); __raw_writeb(v, p); }) 354 #define iowrite16(v,p) ({ __iowmb(); __raw_writew((__force __u16)cpu_to_le16(v), p); }) 355 #define iowrite32(v,p) ({ __iowmb(); __raw_writel((__force __u32)cpu_to_le32(v), p); }) 356 357 #define iowrite16be(v,p) ({ __iowmb(); __raw_writew((__force __u16)cpu_to_be16(v), p); }) 358 #define iowrite32be(v,p) ({ __iowmb(); __raw_writel((__force __u32)cpu_to_be32(v), p); }) 359 360 #define ioread8_rep(p,d,c) __raw_readsb(p,d,c) 361 #define ioread16_rep(p,d,c) __raw_readsw(p,d,c) 362 #define ioread32_rep(p,d,c) __raw_readsl(p,d,c) 363 364 #define iowrite8_rep(p,s,c) __raw_writesb(p,s,c) 365 #define iowrite16_rep(p,s,c) __raw_writesw(p,s,c) 366 #define iowrite32_rep(p,s,c) __raw_writesl(p,s,c) 367 368 extern void __iomem *ioport_map(unsigned long port, unsigned int nr); 369 extern void ioport_unmap(void __iomem *addr); 370 #endif 371 372 struct pci_dev; 373 374 extern void pci_iounmap(struct pci_dev *dev, void __iomem *addr); 375 376 /* 377 * can the hardware map this into one segment or not, given no other 378 * constraints. 379 */ 380 #define BIOVEC_MERGEABLE(vec1, vec2) \ 381 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2))) 382 383 struct bio_vec; 384 extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, 385 const struct bio_vec *vec2); 386 #define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ 387 (__BIOVEC_PHYS_MERGEABLE(vec1, vec2) && \ 388 (!xen_domain() || xen_biovec_phys_mergeable(vec1, vec2))) 389 390 #ifdef CONFIG_MMU 391 #define ARCH_HAS_VALID_PHYS_ADDR_RANGE 392 extern int valid_phys_addr_range(phys_addr_t addr, size_t size); 393 extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size); 394 extern int devmem_is_allowed(unsigned long pfn); 395 #endif 396 397 /* 398 * Convert a physical pointer to a virtual kernel pointer for /dev/mem 399 * access 400 */ 401 #define xlate_dev_mem_ptr(p) __va(p) 402 403 /* 404 * Convert a virtual cached pointer to an uncached pointer 405 */ 406 #define xlate_dev_kmem_ptr(p) p 407 408 /* 409 * Register ISA memory and port locations for glibc iopl/inb/outb 410 * emulation. 411 */ 412 extern void register_isa_ports(unsigned int mmio, unsigned int io, 413 unsigned int io_shift); 414 415 #endif /* __KERNEL__ */ 416 #endif /* __ASM_ARM_IO_H */ 417