include/asm-x86/io_32.h

   1 #ifndef _ASM_IO_H
   2 #define _ASM_IO_H
   3
   4 #include <linux/string.h>
   5 #include <linux/compiler.h>
   6
   7 /*
   8  * This file contains the definitions for the x86 IO instructions
   9  * inb/inw/inl/outb/outw/outl and the "string versions" of the same
  10  * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
  11  * versions of the single-IO instructions (inb_p/inw_p/..).
  12  *
  13  * This file is not meant to be obfuscating: it's just complicated
  14  * to (a) handle it all in a way that makes gcc able to optimize it
  15  * as well as possible and (b) trying to avoid writing the same thing
  16  * over and over again with slight variations and possibly making a
  17  * mistake somewhere.
  18  */
  19
  20 /*
  21  * Thanks to James van Artsdalen for a better timing-fix than
  22  * the two short jumps: using outb's to a nonexistent port seems
  23  * to guarantee better timings even on fast machines.
  24  *
  25  * On the other hand, I'd like to be sure of a non-existent port:
  26  * I feel a bit unsafe about using 0x80 (should be safe, though)
  27  *
  28  *              Linus
  29  */
  30
  31  /*
  32   *  Bit simplified and optimized by Jan Hubicka
  33   *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
  34   *
  35   *  isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
  36   *  isa_read[wl] and isa_write[wl] fixed
  37   *  - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
  38   */
  39
  40 #define IO_SPACE_LIMIT 0xffff
  41
  42 #define XQUAD_PORTIO_BASE 0xfe400000
  43 #define XQUAD_PORTIO_QUAD 0x40000  /* 256k per quad. */
  44
  45 #ifdef __KERNEL__
  46
  47 #include <asm-generic/iomap.h>
  48
  49 #include <linux/vmalloc.h>
  50
  51 /*
  52  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
  53  * access
  54  */
  55 #define xlate_dev_mem_ptr(p)    __va(p)
  56
  57 /*
  58  * Convert a virtual cached pointer to an uncached pointer
  59  */
  60 #define xlate_dev_kmem_ptr(p)   p
  61
  62 /**
  63  *      virt_to_phys    -       map virtual addresses to physical
  64  *      @address: address to remap
  65  *
  66  *      The returned physical address is the physical (CPU) mapping for
  67  *      the memory address given. It is only valid to use this function on
  68  *      addresses directly mapped or allocated via kmalloc.
  69  *
  70  *      This function does not give bus mappings for DMA transfers. In
  71  *      almost all conceivable cases a device driver should not be using
  72  *      this function
  73  */
  74
  75 static inline unsigned long virt_to_phys(volatile void * address)
  76 {
  77         return __pa(address);
  78 }
  79
  80 /**
  81  *      phys_to_virt    -       map physical address to virtual
  82  *      @address: address to remap
  83  *
  84  *      The returned virtual address is a current CPU mapping for
  85  *      the memory address given. It is only valid to use this function on
  86  *      addresses that have a kernel mapping
  87  *
  88  *      This function does not handle bus mappings for DMA transfers. In
  89  *      almost all conceivable cases a device driver should not be using
  90  *      this function
  91  */
  92
  93 static inline void * phys_to_virt(unsigned long address)
  94 {
  95         return __va(address);
  96 }
  97
  98 /*
  99  * Change "struct page" to physical address.
 100  */
 101 #define page_to_phys(page)    ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
 102
 103 extern void __iomem * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
 104
 105 /**
 106  * ioremap     -   map bus memory into CPU space
 107  * @offset:    bus address of the memory
 108  * @size:      size of the resource to map
 109  *
 110  * ioremap performs a platform specific sequence of operations to
 111  * make bus memory CPU accessible via the readb/readw/readl/writeb/
 112  * writew/writel functions and the other mmio helpers. The returned
 113  * address is not guaranteed to be usable directly as a virtual
 114  * address.
 115  *
 116  * If the area you are trying to map is a PCI BAR you should have a
 117  * look at pci_iomap().
 118  */
 119 extern void __iomem * ioremap_nocache(unsigned long offset, unsigned long size);
 120
 121 static inline void __iomem *
 122 ioremap_cache(unsigned long offset, unsigned long size)
 123 {
 124         return __ioremap(offset, size, 0);
 125 }
 126
 127 /*
 128  * The default ioremap() behavior is non-cached:
 129  */
 130 static inline void __iomem * ioremap(unsigned long offset, unsigned long size)
 131 {
 132         return ioremap_nocache(offset, size);
 133 }
 134
 135 extern void iounmap(volatile void __iomem *addr);
 136
 137 /*
 138  * early_ioremap() and early_iounmap() are for temporary early boot-time
 139  * mappings, before the real ioremap() is functional.
 140  * A boot-time mapping is currently limited to at most 16 pages.
 141  */
 142 extern void early_ioremap_init(void);
 143 extern void early_ioremap_clear(void);
 144 extern void early_ioremap_reset(void);
 145 extern void *early_ioremap(unsigned long offset, unsigned long size);
 146 extern void early_iounmap(void *addr, unsigned long size);
 147 extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys);
 148
 149 /* Use early IO mappings for DMI because it's initialized early */
 150 #define dmi_ioremap early_ioremap
 151 #define dmi_iounmap early_iounmap
 152 #define dmi_alloc alloc_bootmem
 153
 154 /*
 155  * ISA I/O bus memory addresses are 1:1 with the physical address.
 156  */
 157 #define isa_virt_to_bus virt_to_phys
 158 #define isa_page_to_bus page_to_phys
 159 #define isa_bus_to_virt phys_to_virt
 160
 161 /*
 162  * However PCI ones are not necessarily 1:1 and therefore these interfaces
 163  * are forbidden in portable PCI drivers.
 164  *
 165  * Allow them on x86 for legacy drivers, though.
 166  */
 167 #define virt_to_bus virt_to_phys
 168 #define bus_to_virt phys_to_virt
 169
 170 /*
 171  * readX/writeX() are used to access memory mapped devices. On some
 172  * architectures the memory mapped IO stuff needs to be accessed
 173  * differently. On the x86 architecture, we just read/write the
 174  * memory location directly.
 175  */
 176
 177 static inline unsigned char readb(const volatile void __iomem *addr)
 178 {
 179         return *(volatile unsigned char __force *) addr;
 180 }
 181 static inline unsigned short readw(const volatile void __iomem *addr)
 182 {
 183         return *(volatile unsigned short __force *) addr;
 184 }
 185 static inline unsigned int readl(const volatile void __iomem *addr)
 186 {
 187         return *(volatile unsigned int __force *) addr;
 188 }
 189 #define readb_relaxed(addr) readb(addr)
 190 #define readw_relaxed(addr) readw(addr)
 191 #define readl_relaxed(addr) readl(addr)
 192 #define __raw_readb readb
 193 #define __raw_readw readw
 194 #define __raw_readl readl
 195
 196 static inline void writeb(unsigned char b, volatile void __iomem *addr)
 197 {
 198         *(volatile unsigned char __force *) addr = b;
 199 }
 200 static inline void writew(unsigned short b, volatile void __iomem *addr)
 201 {
 202         *(volatile unsigned short __force *) addr = b;
 203 }
 204 static inline void writel(unsigned int b, volatile void __iomem *addr)
 205 {
 206         *(volatile unsigned int __force *) addr = b;
 207 }
 208 #define __raw_writeb writeb
 209 #define __raw_writew writew
 210 #define __raw_writel writel
 211
 212 #define mmiowb()
 213
 214 static inline void
 215 memset_io(volatile void __iomem *addr, unsigned char val, int count)
 216 {
 217         memset((void __force *)addr, val, count);
 218 }
 219
 220 static inline void
 221 memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
 222 {
 223         __memcpy(dst, (const void __force *)src, count);
 224 }
 225
 226 static inline void
 227 memcpy_toio(volatile void __iomem *dst, const void *src, int count)
 228 {
 229         __memcpy((void __force *)dst, src, count);
 230 }
 231
 232 /*
 233  * ISA space is 'always mapped' on a typical x86 system, no need to
 234  * explicitly ioremap() it. The fact that the ISA IO space is mapped
 235  * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
 236  * are physical addresses. The following constant pointer can be
 237  * used as the IO-area pointer (it can be iounmapped as well, so the
 238  * analogy with PCI is quite large):
 239  */
 240 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
 241
 242 /*
 243  *      Cache management
 244  *
 245  *      This needed for two cases
 246  *      1. Out of order aware processors
 247  *      2. Accidentally out of order processors (PPro errata #51)
 248  */
 249
 250 #if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE)
 251
 252 static inline void flush_write_buffers(void)
 253 {
 254         __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory");
 255 }
 256
 257 #else
 258
 259 #define flush_write_buffers() do { } while (0)
 260
 261 #endif
 262
 263 #endif /* __KERNEL__ */
 264
 265 extern void native_io_delay(void);
 266
 267 extern int io_delay_type;
 268 extern void io_delay_init(void);
 269
 270 #if defined(CONFIG_PARAVIRT)
 271 #include <asm/paravirt.h>
 272 #else
 273
 274 static inline void slow_down_io(void) {
 275         native_io_delay();
 276 #ifdef REALLY_SLOW_IO
 277         native_io_delay();
 278         native_io_delay();
 279         native_io_delay();
 280 #endif
 281 }
 282
 283 #endif
 284
 285 #ifdef CONFIG_X86_NUMAQ
 286 extern void *xquad_portio;    /* Where the IO area was mapped */
 287 #define XQUAD_PORT_ADDR(port, quad) (xquad_portio + (XQUAD_PORTIO_QUAD*quad) + port)
 288 #define __BUILDIO(bwl,bw,type) \
 289 static inline void out##bwl##_quad(unsigned type value, int port, int quad) { \
 290         if (xquad_portio) \
 291                 write##bwl(value, XQUAD_PORT_ADDR(port, quad)); \
 292         else \
 293                 out##bwl##_local(value, port); \
 294 } \
 295 static inline void out##bwl(unsigned type value, int port) { \
 296         out##bwl##_quad(value, port, 0); \
 297 } \
 298 static inline unsigned type in##bwl##_quad(int port, int quad) { \
 299         if (xquad_portio) \
 300                 return read##bwl(XQUAD_PORT_ADDR(port, quad)); \
 301         else \
 302                 return in##bwl##_local(port); \
 303 } \
 304 static inline unsigned type in##bwl(int port) { \
 305         return in##bwl##_quad(port, 0); \
 306 }
 307 #else
 308 #define __BUILDIO(bwl,bw,type) \
 309 static inline void out##bwl(unsigned type value, int port) { \
 310         out##bwl##_local(value, port); \
 311 } \
 312 static inline unsigned type in##bwl(int port) { \
 313         return in##bwl##_local(port); \
 314 }
 315 #endif
 316
 317
 318 #define BUILDIO(bwl,bw,type) \
 319 static inline void out##bwl##_local(unsigned type value, int port) { \
 320         __asm__ __volatile__("out" #bwl " %" #bw "0, %w1" : : "a"(value), "Nd"(port)); \
 321 } \
 322 static inline unsigned type in##bwl##_local(int port) { \
 323         unsigned type value; \
 324         __asm__ __volatile__("in" #bwl " %w1, %" #bw "0" : "=a"(value) : "Nd"(port)); \
 325         return value; \
 326 } \
 327 static inline void out##bwl##_local_p(unsigned type value, int port) { \
 328         out##bwl##_local(value, port); \
 329         slow_down_io(); \
 330 } \
 331 static inline unsigned type in##bwl##_local_p(int port) { \
 332         unsigned type value = in##bwl##_local(port); \
 333         slow_down_io(); \
 334         return value; \
 335 } \
 336 __BUILDIO(bwl,bw,type) \
 337 static inline void out##bwl##_p(unsigned type value, int port) { \
 338         out##bwl(value, port); \
 339         slow_down_io(); \
 340 } \
 341 static inline unsigned type in##bwl##_p(int port) { \
 342         unsigned type value = in##bwl(port); \
 343         slow_down_io(); \
 344         return value; \
 345 } \
 346 static inline void outs##bwl(int port, const void *addr, unsigned long count) { \
 347         __asm__ __volatile__("rep; outs" #bwl : "+S"(addr), "+c"(count) : "d"(port)); \
 348 } \
 349 static inline void ins##bwl(int port, void *addr, unsigned long count) { \
 350         __asm__ __volatile__("rep; ins" #bwl : "+D"(addr), "+c"(count) : "d"(port)); \
 351 }
 352
 353 BUILDIO(b,b,char)
 354 BUILDIO(w,w,short)
 355 BUILDIO(l,,int)
 356
 357 #endif