1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ALPHA_IO_H 3 #define __ALPHA_IO_H 4 5 #ifdef __KERNEL__ 6 7 #include <linux/kernel.h> 8 #include <linux/mm.h> 9 #include <asm/compiler.h> 10 #include <asm/machvec.h> 11 #include <asm/hwrpb.h> 12 13 /* The generic header contains only prototypes. Including it ensures that 14 the implementation we have here matches that interface. */ 15 #include <asm-generic/iomap.h> 16 17 /* 18 * Virtual -> physical identity mapping starts at this offset 19 */ 20 #ifdef USE_48_BIT_KSEG 21 #define IDENT_ADDR 0xffff800000000000UL 22 #else 23 #define IDENT_ADDR 0xfffffc0000000000UL 24 #endif 25 26 /* 27 * We try to avoid hae updates (thus the cache), but when we 28 * do need to update the hae, we need to do it atomically, so 29 * that any interrupts wouldn't get confused with the hae 30 * register not being up-to-date with respect to the hardware 31 * value. 32 */ 33 extern inline void __set_hae(unsigned long new_hae) 34 { 35 unsigned long flags = swpipl(IPL_MAX); 36 37 barrier(); 38 39 alpha_mv.hae_cache = new_hae; 40 *alpha_mv.hae_register = new_hae; 41 mb(); 42 /* Re-read to make sure it was written. */ 43 new_hae = *alpha_mv.hae_register; 44 45 setipl(flags); 46 barrier(); 47 } 48 49 extern inline void set_hae(unsigned long new_hae) 50 { 51 if (new_hae != alpha_mv.hae_cache) 52 __set_hae(new_hae); 53 } 54 55 /* 56 * Change virtual addresses to physical addresses and vv. 57 */ 58 #ifdef USE_48_BIT_KSEG 59 static inline unsigned long virt_to_phys(volatile void *address) 60 { 61 return (unsigned long)address - IDENT_ADDR; 62 } 63 64 static inline void * phys_to_virt(unsigned long address) 65 { 66 return (void *) (address + IDENT_ADDR); 67 } 68 #else 69 static inline unsigned long virt_to_phys(volatile void *address) 70 { 71 unsigned long phys = (unsigned long)address; 72 73 /* Sign-extend from bit 41. */ 74 phys <<= (64 - 41); 75 phys = (long)phys >> (64 - 41); 76 77 /* Crop to the physical address width of the processor. */ 78 phys &= (1ul << hwrpb->pa_bits) - 1; 79 80 return phys; 81 } 82 83 static inline void * phys_to_virt(unsigned long address) 84 { 85 return (void *)(IDENT_ADDR + (address & ((1ul << 41) - 1))); 86 } 87 #endif 88 89 #define virt_to_phys virt_to_phys 90 #define phys_to_virt phys_to_virt 91 #define page_to_phys(page) page_to_pa(page) 92 93 /* Maximum PIO space address supported? */ 94 #define IO_SPACE_LIMIT 0xffff 95 96 /* 97 * Change addresses as seen by the kernel (virtual) to addresses as 98 * seen by a device (bus), and vice versa. 99 * 100 * Note that this only works for a limited range of kernel addresses, 101 * and very well may not span all memory. Consider this interface 102 * deprecated in favour of the DMA-mapping API. 103 */ 104 extern unsigned long __direct_map_base; 105 extern unsigned long __direct_map_size; 106 107 static inline unsigned long __deprecated isa_virt_to_bus(volatile void *address) 108 { 109 unsigned long phys = virt_to_phys(address); 110 unsigned long bus = phys + __direct_map_base; 111 return phys <= __direct_map_size ? bus : 0; 112 } 113 #define isa_virt_to_bus isa_virt_to_bus 114 115 static inline void * __deprecated isa_bus_to_virt(unsigned long address) 116 { 117 void *virt; 118 119 /* This check is a sanity check but also ensures that bus address 0 120 maps to virtual address 0 which is useful to detect null pointers 121 (the NCR driver is much simpler if NULL pointers are preserved). */ 122 address -= __direct_map_base; 123 virt = phys_to_virt(address); 124 return (long)address <= 0 ? NULL : virt; 125 } 126 #define isa_bus_to_virt isa_bus_to_virt 127 128 /* 129 * There are different chipsets to interface the Alpha CPUs to the world. 130 */ 131 132 #define IO_CONCAT(a,b) _IO_CONCAT(a,b) 133 #define _IO_CONCAT(a,b) a ## _ ## b 134 135 #ifdef CONFIG_ALPHA_GENERIC 136 137 /* In a generic kernel, we always go through the machine vector. */ 138 139 #define REMAP1(TYPE, NAME, QUAL) \ 140 static inline TYPE generic_##NAME(QUAL void __iomem *addr) \ 141 { \ 142 return alpha_mv.mv_##NAME(addr); \ 143 } 144 145 #define REMAP2(TYPE, NAME, QUAL) \ 146 static inline void generic_##NAME(TYPE b, QUAL void __iomem *addr) \ 147 { \ 148 alpha_mv.mv_##NAME(b, addr); \ 149 } 150 151 REMAP1(unsigned int, ioread8, const) 152 REMAP1(unsigned int, ioread16, const) 153 REMAP1(unsigned int, ioread32, const) 154 REMAP1(u64, ioread64, const) 155 REMAP1(u8, readb, const volatile) 156 REMAP1(u16, readw, const volatile) 157 REMAP1(u32, readl, const volatile) 158 REMAP1(u64, readq, const volatile) 159 160 REMAP2(u8, iowrite8, /**/) 161 REMAP2(u16, iowrite16, /**/) 162 REMAP2(u32, iowrite32, /**/) 163 REMAP2(u64, iowrite64, /**/) 164 REMAP2(u8, writeb, volatile) 165 REMAP2(u16, writew, volatile) 166 REMAP2(u32, writel, volatile) 167 REMAP2(u64, writeq, volatile) 168 169 #undef REMAP1 170 #undef REMAP2 171 172 extern inline void __iomem *generic_ioportmap(unsigned long a) 173 { 174 return alpha_mv.mv_ioportmap(a); 175 } 176 177 static inline void __iomem *generic_ioremap(unsigned long a, unsigned long s) 178 { 179 return alpha_mv.mv_ioremap(a, s); 180 } 181 182 static inline void generic_iounmap(volatile void __iomem *a) 183 { 184 return alpha_mv.mv_iounmap(a); 185 } 186 187 static inline int generic_is_ioaddr(unsigned long a) 188 { 189 return alpha_mv.mv_is_ioaddr(a); 190 } 191 192 static inline int generic_is_mmio(const volatile void __iomem *a) 193 { 194 return alpha_mv.mv_is_mmio(a); 195 } 196 197 #define __IO_PREFIX generic 198 #define generic_trivial_rw_bw 0 199 #define generic_trivial_rw_lq 0 200 #define generic_trivial_io_bw 0 201 #define generic_trivial_io_lq 0 202 #define generic_trivial_iounmap 0 203 204 #else 205 206 #if defined(CONFIG_ALPHA_APECS) 207 # include <asm/core_apecs.h> 208 #elif defined(CONFIG_ALPHA_CIA) 209 # include <asm/core_cia.h> 210 #elif defined(CONFIG_ALPHA_IRONGATE) 211 # include <asm/core_irongate.h> 212 #elif defined(CONFIG_ALPHA_JENSEN) 213 # include <asm/jensen.h> 214 #elif defined(CONFIG_ALPHA_LCA) 215 # include <asm/core_lca.h> 216 #elif defined(CONFIG_ALPHA_MARVEL) 217 # include <asm/core_marvel.h> 218 #elif defined(CONFIG_ALPHA_MCPCIA) 219 # include <asm/core_mcpcia.h> 220 #elif defined(CONFIG_ALPHA_POLARIS) 221 # include <asm/core_polaris.h> 222 #elif defined(CONFIG_ALPHA_T2) 223 # include <asm/core_t2.h> 224 #elif defined(CONFIG_ALPHA_TSUNAMI) 225 # include <asm/core_tsunami.h> 226 #elif defined(CONFIG_ALPHA_TITAN) 227 # include <asm/core_titan.h> 228 #elif defined(CONFIG_ALPHA_WILDFIRE) 229 # include <asm/core_wildfire.h> 230 #else 231 #error "What system is this?" 232 #endif 233 234 #endif /* GENERIC */ 235 236 /* 237 * We always have external versions of these routines. 238 */ 239 extern u8 inb(unsigned long port); 240 extern u16 inw(unsigned long port); 241 extern u32 inl(unsigned long port); 242 extern void outb(u8 b, unsigned long port); 243 extern void outw(u16 b, unsigned long port); 244 extern void outl(u32 b, unsigned long port); 245 #define inb inb 246 #define inw inw 247 #define inl inl 248 #define outb outb 249 #define outw outw 250 #define outl outl 251 252 extern u8 readb(const volatile void __iomem *addr); 253 extern u16 readw(const volatile void __iomem *addr); 254 extern u32 readl(const volatile void __iomem *addr); 255 extern u64 readq(const volatile void __iomem *addr); 256 extern void writeb(u8 b, volatile void __iomem *addr); 257 extern void writew(u16 b, volatile void __iomem *addr); 258 extern void writel(u32 b, volatile void __iomem *addr); 259 extern void writeq(u64 b, volatile void __iomem *addr); 260 #define readb readb 261 #define readw readw 262 #define readl readl 263 #define readq readq 264 #define writeb writeb 265 #define writew writew 266 #define writel writel 267 #define writeq writeq 268 269 extern u8 __raw_readb(const volatile void __iomem *addr); 270 extern u16 __raw_readw(const volatile void __iomem *addr); 271 extern u32 __raw_readl(const volatile void __iomem *addr); 272 extern u64 __raw_readq(const volatile void __iomem *addr); 273 extern void __raw_writeb(u8 b, volatile void __iomem *addr); 274 extern void __raw_writew(u16 b, volatile void __iomem *addr); 275 extern void __raw_writel(u32 b, volatile void __iomem *addr); 276 extern void __raw_writeq(u64 b, volatile void __iomem *addr); 277 #define __raw_readb __raw_readb 278 #define __raw_readw __raw_readw 279 #define __raw_readl __raw_readl 280 #define __raw_readq __raw_readq 281 #define __raw_writeb __raw_writeb 282 #define __raw_writew __raw_writew 283 #define __raw_writel __raw_writel 284 #define __raw_writeq __raw_writeq 285 286 /* 287 * Mapping from port numbers to __iomem space is pretty easy. 288 */ 289 290 /* These two have to be extern inline because of the extern prototype from 291 <asm-generic/iomap.h>. It is not legal to mix "extern" and "static" for 292 the same declaration. */ 293 extern inline void __iomem *ioport_map(unsigned long port, unsigned int size) 294 { 295 return IO_CONCAT(__IO_PREFIX,ioportmap) (port); 296 } 297 298 extern inline void ioport_unmap(void __iomem *addr) 299 { 300 } 301 302 #define ioport_map ioport_map 303 #define ioport_unmap ioport_unmap 304 305 static inline void __iomem *ioremap(unsigned long port, unsigned long size) 306 { 307 return IO_CONCAT(__IO_PREFIX,ioremap) (port, size); 308 } 309 310 #define ioremap_wc ioremap 311 312 static inline void iounmap(volatile void __iomem *addr) 313 { 314 IO_CONCAT(__IO_PREFIX,iounmap)(addr); 315 } 316 317 static inline int __is_ioaddr(unsigned long addr) 318 { 319 return IO_CONCAT(__IO_PREFIX,is_ioaddr)(addr); 320 } 321 #define __is_ioaddr(a) __is_ioaddr((unsigned long)(a)) 322 323 static inline int __is_mmio(const volatile void __iomem *addr) 324 { 325 return IO_CONCAT(__IO_PREFIX,is_mmio)(addr); 326 } 327 328 329 /* 330 * If the actual I/O bits are sufficiently trivial, then expand inline. 331 */ 332 333 #if IO_CONCAT(__IO_PREFIX,trivial_io_bw) 334 extern inline unsigned int ioread8(const void __iomem *addr) 335 { 336 unsigned int ret; 337 mb(); 338 ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr); 339 mb(); 340 return ret; 341 } 342 343 extern inline unsigned int ioread16(const void __iomem *addr) 344 { 345 unsigned int ret; 346 mb(); 347 ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr); 348 mb(); 349 return ret; 350 } 351 352 extern inline void iowrite8(u8 b, void __iomem *addr) 353 { 354 mb(); 355 IO_CONCAT(__IO_PREFIX, iowrite8)(b, addr); 356 } 357 358 extern inline void iowrite16(u16 b, void __iomem *addr) 359 { 360 mb(); 361 IO_CONCAT(__IO_PREFIX, iowrite16)(b, addr); 362 } 363 364 extern inline u8 inb(unsigned long port) 365 { 366 return ioread8(ioport_map(port, 1)); 367 } 368 369 extern inline u16 inw(unsigned long port) 370 { 371 return ioread16(ioport_map(port, 2)); 372 } 373 374 extern inline void outb(u8 b, unsigned long port) 375 { 376 iowrite8(b, ioport_map(port, 1)); 377 } 378 379 extern inline void outw(u16 b, unsigned long port) 380 { 381 iowrite16(b, ioport_map(port, 2)); 382 } 383 #endif 384 385 #define ioread8 ioread8 386 #define ioread16 ioread16 387 #define iowrite8 iowrite8 388 #define iowrite16 iowrite16 389 390 #if IO_CONCAT(__IO_PREFIX,trivial_io_lq) 391 extern inline unsigned int ioread32(const void __iomem *addr) 392 { 393 unsigned int ret; 394 mb(); 395 ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr); 396 mb(); 397 return ret; 398 } 399 400 extern inline u64 ioread64(const void __iomem *addr) 401 { 402 unsigned int ret; 403 mb(); 404 ret = IO_CONCAT(__IO_PREFIX,ioread64)(addr); 405 mb(); 406 return ret; 407 } 408 409 extern inline void iowrite32(u32 b, void __iomem *addr) 410 { 411 mb(); 412 IO_CONCAT(__IO_PREFIX, iowrite32)(b, addr); 413 } 414 415 extern inline void iowrite64(u64 b, void __iomem *addr) 416 { 417 mb(); 418 IO_CONCAT(__IO_PREFIX, iowrite64)(b, addr); 419 } 420 421 extern inline u32 inl(unsigned long port) 422 { 423 return ioread32(ioport_map(port, 4)); 424 } 425 426 extern inline void outl(u32 b, unsigned long port) 427 { 428 iowrite32(b, ioport_map(port, 4)); 429 } 430 #endif 431 432 #define ioread32 ioread32 433 #define ioread64 ioread64 434 #define iowrite32 iowrite32 435 #define iowrite64 iowrite64 436 437 #if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1 438 extern inline u8 __raw_readb(const volatile void __iomem *addr) 439 { 440 return IO_CONCAT(__IO_PREFIX,readb)(addr); 441 } 442 443 extern inline u16 __raw_readw(const volatile void __iomem *addr) 444 { 445 return IO_CONCAT(__IO_PREFIX,readw)(addr); 446 } 447 448 extern inline void __raw_writeb(u8 b, volatile void __iomem *addr) 449 { 450 IO_CONCAT(__IO_PREFIX,writeb)(b, addr); 451 } 452 453 extern inline void __raw_writew(u16 b, volatile void __iomem *addr) 454 { 455 IO_CONCAT(__IO_PREFIX,writew)(b, addr); 456 } 457 458 extern inline u8 readb(const volatile void __iomem *addr) 459 { 460 u8 ret; 461 mb(); 462 ret = __raw_readb(addr); 463 mb(); 464 return ret; 465 } 466 467 extern inline u16 readw(const volatile void __iomem *addr) 468 { 469 u16 ret; 470 mb(); 471 ret = __raw_readw(addr); 472 mb(); 473 return ret; 474 } 475 476 extern inline void writeb(u8 b, volatile void __iomem *addr) 477 { 478 mb(); 479 __raw_writeb(b, addr); 480 } 481 482 extern inline void writew(u16 b, volatile void __iomem *addr) 483 { 484 mb(); 485 __raw_writew(b, addr); 486 } 487 #endif 488 489 #if IO_CONCAT(__IO_PREFIX,trivial_rw_lq) == 1 490 extern inline u32 __raw_readl(const volatile void __iomem *addr) 491 { 492 return IO_CONCAT(__IO_PREFIX,readl)(addr); 493 } 494 495 extern inline u64 __raw_readq(const volatile void __iomem *addr) 496 { 497 return IO_CONCAT(__IO_PREFIX,readq)(addr); 498 } 499 500 extern inline void __raw_writel(u32 b, volatile void __iomem *addr) 501 { 502 IO_CONCAT(__IO_PREFIX,writel)(b, addr); 503 } 504 505 extern inline void __raw_writeq(u64 b, volatile void __iomem *addr) 506 { 507 IO_CONCAT(__IO_PREFIX,writeq)(b, addr); 508 } 509 510 extern inline u32 readl(const volatile void __iomem *addr) 511 { 512 u32 ret; 513 mb(); 514 ret = __raw_readl(addr); 515 mb(); 516 return ret; 517 } 518 519 extern inline u64 readq(const volatile void __iomem *addr) 520 { 521 u64 ret; 522 mb(); 523 ret = __raw_readq(addr); 524 mb(); 525 return ret; 526 } 527 528 extern inline void writel(u32 b, volatile void __iomem *addr) 529 { 530 mb(); 531 __raw_writel(b, addr); 532 } 533 534 extern inline void writeq(u64 b, volatile void __iomem *addr) 535 { 536 mb(); 537 __raw_writeq(b, addr); 538 } 539 #endif 540 541 #define ioread16be(p) swab16(ioread16(p)) 542 #define ioread32be(p) swab32(ioread32(p)) 543 #define iowrite16be(v,p) iowrite16(swab16(v), (p)) 544 #define iowrite32be(v,p) iowrite32(swab32(v), (p)) 545 546 #define inb_p inb 547 #define inw_p inw 548 #define inl_p inl 549 #define outb_p outb 550 #define outw_p outw 551 #define outl_p outl 552 553 extern u8 readb_relaxed(const volatile void __iomem *addr); 554 extern u16 readw_relaxed(const volatile void __iomem *addr); 555 extern u32 readl_relaxed(const volatile void __iomem *addr); 556 extern u64 readq_relaxed(const volatile void __iomem *addr); 557 #define readb_relaxed readb_relaxed 558 #define readw_relaxed readw_relaxed 559 #define readl_relaxed readl_relaxed 560 #define readq_relaxed readq_relaxed 561 562 #if IO_CONCAT(__IO_PREFIX,trivial_io_bw) 563 extern inline u8 readb_relaxed(const volatile void __iomem *addr) 564 { 565 mb(); 566 return __raw_readb(addr); 567 } 568 569 extern inline u16 readw_relaxed(const volatile void __iomem *addr) 570 { 571 mb(); 572 return __raw_readw(addr); 573 } 574 #endif 575 576 #if IO_CONCAT(__IO_PREFIX,trivial_io_lq) 577 extern inline u32 readl_relaxed(const volatile void __iomem *addr) 578 { 579 mb(); 580 return __raw_readl(addr); 581 } 582 583 extern inline u64 readq_relaxed(const volatile void __iomem *addr) 584 { 585 mb(); 586 return __raw_readq(addr); 587 } 588 #endif 589 590 #define writeb_relaxed writeb 591 #define writew_relaxed writew 592 #define writel_relaxed writel 593 #define writeq_relaxed writeq 594 595 /* 596 * String version of IO memory access ops: 597 */ 598 extern void memcpy_fromio(void *, const volatile void __iomem *, long); 599 extern void memcpy_toio(volatile void __iomem *, const void *, long); 600 extern void _memset_c_io(volatile void __iomem *, unsigned long, long); 601 602 static inline void memset_io(volatile void __iomem *addr, u8 c, long len) 603 { 604 _memset_c_io(addr, 0x0101010101010101UL * c, len); 605 } 606 607 #define __HAVE_ARCH_MEMSETW_IO 608 static inline void memsetw_io(volatile void __iomem *addr, u16 c, long len) 609 { 610 _memset_c_io(addr, 0x0001000100010001UL * c, len); 611 } 612 613 #define memset_io memset_io 614 #define memcpy_fromio memcpy_fromio 615 #define memcpy_toio memcpy_toio 616 617 /* 618 * String versions of in/out ops: 619 */ 620 extern void insb (unsigned long port, void *dst, unsigned long count); 621 extern void insw (unsigned long port, void *dst, unsigned long count); 622 extern void insl (unsigned long port, void *dst, unsigned long count); 623 extern void outsb (unsigned long port, const void *src, unsigned long count); 624 extern void outsw (unsigned long port, const void *src, unsigned long count); 625 extern void outsl (unsigned long port, const void *src, unsigned long count); 626 627 #define insb insb 628 #define insw insw 629 #define insl insl 630 #define outsb outsb 631 #define outsw outsw 632 #define outsl outsl 633 634 /* 635 * The Alpha Jensen hardware for some rather strange reason puts 636 * the RTC clock at 0x170 instead of 0x70. Probably due to some 637 * misguided idea about using 0x70 for NMI stuff. 638 * 639 * These defines will override the defaults when doing RTC queries 640 */ 641 642 #ifdef CONFIG_ALPHA_GENERIC 643 # define RTC_PORT(x) ((x) + alpha_mv.rtc_port) 644 #else 645 # ifdef CONFIG_ALPHA_JENSEN 646 # define RTC_PORT(x) (0x170+(x)) 647 # else 648 # define RTC_PORT(x) (0x70 + (x)) 649 # endif 650 #endif 651 #define RTC_ALWAYS_BCD 0 652 653 /* 654 * These get provided from <asm-generic/iomap.h> since alpha does not 655 * select GENERIC_IOMAP. 656 */ 657 #define ioread64 ioread64 658 #define iowrite64 iowrite64 659 #define ioread64be ioread64be 660 #define iowrite64be iowrite64be 661 #define ioread8_rep ioread8_rep 662 #define ioread16_rep ioread16_rep 663 #define ioread32_rep ioread32_rep 664 #define iowrite8_rep iowrite8_rep 665 #define iowrite16_rep iowrite16_rep 666 #define iowrite32_rep iowrite32_rep 667 #define pci_iounmap pci_iounmap 668 669 #include <asm-generic/io.h> 670 671 #endif /* __KERNEL__ */ 672 673 #endif /* __ALPHA_IO_H */ 674