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 (at) 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 */ 119 120 static inline void __iomem * ioremap(unsigned long offset, unsigned long size) 121 { 122 return __ioremap(offset, size, 0); 123 } 124 125 extern void __iomem * ioremap_nocache(unsigned long offset, unsigned long size); 126 extern void iounmap(volatile void __iomem *addr); 127 128 /* 129 * bt_ioremap() and bt_iounmap() are for temporary early boot-time 130 * mappings, before the real ioremap() is functional. 131 * A boot-time mapping is currently limited to at most 16 pages. 132 */ 133 extern void *bt_ioremap(unsigned long offset, unsigned long size); 134 extern void bt_iounmap(void *addr, unsigned long size); 135 extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys); 136 137 /* Use early IO mappings for DMI because it's initialized early */ 138 #define dmi_ioremap bt_ioremap 139 #define dmi_iounmap bt_iounmap 140 #define dmi_alloc alloc_bootmem 141 142 /* 143 * ISA I/O bus memory addresses are 1:1 with the physical address. 144 */ 145 #define isa_virt_to_bus virt_to_phys 146 #define isa_page_to_bus page_to_phys 147 #define isa_bus_to_virt phys_to_virt 148 149 /* 150 * However PCI ones are not necessarily 1:1 and therefore these interfaces 151 * are forbidden in portable PCI drivers. 152 * 153 * Allow them on x86 for legacy drivers, though. 154 */ 155 #define virt_to_bus virt_to_phys 156 #define bus_to_virt phys_to_virt 157 158 /* 159 * readX/writeX() are used to access memory mapped devices. On some 160 * architectures the memory mapped IO stuff needs to be accessed 161 * differently. On the x86 architecture, we just read/write the 162 * memory location directly. 163 */ 164 165 static inline unsigned char readb(const volatile void __iomem *addr) 166 { 167 return *(volatile unsigned char __force *) addr; 168 } 169 static inline unsigned short readw(const volatile void __iomem *addr) 170 { 171 return *(volatile unsigned short __force *) addr; 172 } 173 static inline unsigned int readl(const volatile void __iomem *addr) 174 { 175 return *(volatile unsigned int __force *) addr; 176 } 177 #define readb_relaxed(addr) readb(addr) 178 #define readw_relaxed(addr) readw(addr) 179 #define readl_relaxed(addr) readl(addr) 180 #define __raw_readb readb 181 #define __raw_readw readw 182 #define __raw_readl readl 183 184 static inline void writeb(unsigned char b, volatile void __iomem *addr) 185 { 186 *(volatile unsigned char __force *) addr = b; 187 } 188 static inline void writew(unsigned short b, volatile void __iomem *addr) 189 { 190 *(volatile unsigned short __force *) addr = b; 191 } 192 static inline void writel(unsigned int b, volatile void __iomem *addr) 193 { 194 *(volatile unsigned int __force *) addr = b; 195 } 196 #define __raw_writeb writeb 197 #define __raw_writew writew 198 #define __raw_writel writel 199 200 #define mmiowb() 201 202 static inline void 203 memset_io(volatile void __iomem *addr, unsigned char val, int count) 204 { 205 memset((void __force *)addr, val, count); 206 } 207 208 static inline void 209 memcpy_fromio(void *dst, const volatile void __iomem *src, int count) 210 { 211 __memcpy(dst, (const void __force *)src, count); 212 } 213 214 static inline void 215 memcpy_toio(volatile void __iomem *dst, const void *src, int count) 216 { 217 __memcpy((void __force *)dst, src, count); 218 } 219 220 /* 221 * ISA space is 'always mapped' on a typical x86 system, no need to 222 * explicitly ioremap() it. The fact that the ISA IO space is mapped 223 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values 224 * are physical addresses. The following constant pointer can be 225 * used as the IO-area pointer (it can be iounmapped as well, so the 226 * analogy with PCI is quite large): 227 */ 228 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET)) 229 230 /* 231 * Cache management 232 * 233 * This needed for two cases 234 * 1. Out of order aware processors 235 * 2. Accidentally out of order processors (PPro errata #51) 236 */ 237 238 #if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE) 239 240 static inline void flush_write_buffers(void) 241 { 242 __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory"); 243 } 244 245 #else 246 247 #define flush_write_buffers() do { } while (0) 248 249 #endif 250 251 #endif /* __KERNEL__ */ 252 253 static inline void native_io_delay(void) 254 { 255 asm volatile("outb %%al,$0x80" : : : "memory"); 256 } 257 258 #if defined(CONFIG_PARAVIRT) 259 #include <asm/paravirt.h> 260 #else 261 262 static inline void slow_down_io(void) { 263 native_io_delay(); 264 #ifdef REALLY_SLOW_IO 265 native_io_delay(); 266 native_io_delay(); 267 native_io_delay(); 268 #endif 269 } 270 271 #endif 272 273 #ifdef CONFIG_X86_NUMAQ 274 extern void *xquad_portio; /* Where the IO area was mapped */ 275 #define XQUAD_PORT_ADDR(port, quad) (xquad_portio + (XQUAD_PORTIO_QUAD*quad) + port) 276 #define __BUILDIO(bwl,bw,type) \ 277 static inline void out##bwl##_quad(unsigned type value, int port, int quad) { \ 278 if (xquad_portio) \ 279 write##bwl(value, XQUAD_PORT_ADDR(port, quad)); \ 280 else \ 281 out##bwl##_local(value, port); \ 282 } \ 283 static inline void out##bwl(unsigned type value, int port) { \ 284 out##bwl##_quad(value, port, 0); \ 285 } \ 286 static inline unsigned type in##bwl##_quad(int port, int quad) { \ 287 if (xquad_portio) \ 288 return read##bwl(XQUAD_PORT_ADDR(port, quad)); \ 289 else \ 290 return in##bwl##_local(port); \ 291 } \ 292 static inline unsigned type in##bwl(int port) { \ 293 return in##bwl##_quad(port, 0); \ 294 } 295 #else 296 #define __BUILDIO(bwl,bw,type) \ 297 static inline void out##bwl(unsigned type value, int port) { \ 298 out##bwl##_local(value, port); \ 299 } \ 300 static inline unsigned type in##bwl(int port) { \ 301 return in##bwl##_local(port); \ 302 } 303 #endif 304 305 306 #define BUILDIO(bwl,bw,type) \ 307 static inline void out##bwl##_local(unsigned type value, int port) { \ 308 __asm__ __volatile__("out" #bwl " %" #bw "0, %w1" : : "a"(value), "Nd"(port)); \ 309 } \ 310 static inline unsigned type in##bwl##_local(int port) { \ 311 unsigned type value; \ 312 __asm__ __volatile__("in" #bwl " %w1, %" #bw "0" : "=a"(value) : "Nd"(port)); \ 313 return value; \ 314 } \ 315 static inline void out##bwl##_local_p(unsigned type value, int port) { \ 316 out##bwl##_local(value, port); \ 317 slow_down_io(); \ 318 } \ 319 static inline unsigned type in##bwl##_local_p(int port) { \ 320 unsigned type value = in##bwl##_local(port); \ 321 slow_down_io(); \ 322 return value; \ 323 } \ 324 __BUILDIO(bwl,bw,type) \ 325 static inline void out##bwl##_p(unsigned type value, int port) { \ 326 out##bwl(value, port); \ 327 slow_down_io(); \ 328 } \ 329 static inline unsigned type in##bwl##_p(int port) { \ 330 unsigned type value = in##bwl(port); \ 331 slow_down_io(); \ 332 return value; \ 333 } \ 334 static inline void outs##bwl(int port, const void *addr, unsigned long count) { \ 335 __asm__ __volatile__("rep; outs" #bwl : "+S"(addr), "+c"(count) : "d"(port)); \ 336 } \ 337 static inline void ins##bwl(int port, void *addr, unsigned long count) { \ 338 __asm__ __volatile__("rep; ins" #bwl : "+D"(addr), "+c"(count) : "d"(port)); \ 339 } 340 341 BUILDIO(b,b,char) 342 BUILDIO(w,w,short) 343 BUILDIO(l,,int) 344 345 #endif 346
