1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 1994, 1995 Waldorf GmbH 4 * Copyright (C) 1994 - 2000, 06 Ralf Baechle 5 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 6 * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved. 7 * Author: Maciej W. Rozycki <macro@mips.com> 8 */ 9 #ifndef _ASM_IO_H 10 #define _ASM_IO_H 11 12 #include <linux/bug.h> 13 #include <linux/compiler.h> 14 #include <linux/types.h> 15 16 #include <asm/addrspace.h> 17 #include <asm/byteorder.h> 18 #include <asm/cpu-features.h> 19 #include <asm/pgtable-bits.h> 20 #include <asm/processor.h> 21 #include <asm/string.h> 22 23 #include <ioremap.h> 24 #include <mangle-port.h> 25 #include <spaces.h> 26 27 /* 28 * Raw operations are never swapped in software. OTOH values that raw 29 * operations are working on may or may not have been swapped by the bus 30 * hardware. An example use would be for flash memory that's used for 31 * execute in place. 32 */ 33 # define __raw_ioswabb(a, x) (x) 34 # define __raw_ioswabw(a, x) (x) 35 # define __raw_ioswabl(a, x) (x) 36 # define __raw_ioswabq(a, x) (x) 37 # define ____raw_ioswabq(a, x) (x) 38 39 /* ioswab[bwlq], __mem_ioswab[bwlq] are defined in mangle-port.h */ 40 41 #define IO_SPACE_LIMIT 0xffff 42 43 #ifdef CONFIG_DYNAMIC_IO_PORT_BASE 44 45 static inline ulong mips_io_port_base(void) 46 { 47 DECLARE_GLOBAL_DATA_PTR; 48 49 return gd->arch.io_port_base; 50 } 51 52 static inline void set_io_port_base(unsigned long base) 53 { 54 DECLARE_GLOBAL_DATA_PTR; 55 56 gd->arch.io_port_base = base; 57 barrier(); 58 } 59 60 #else /* !CONFIG_DYNAMIC_IO_PORT_BASE */ 61 62 static inline ulong mips_io_port_base(void) 63 { 64 return 0; 65 } 66 67 static inline void set_io_port_base(unsigned long base) 68 { 69 BUG_ON(base); 70 } 71 72 #endif /* !CONFIG_DYNAMIC_IO_PORT_BASE */ 73 74 /* 75 * virt_to_phys - map virtual addresses to physical 76 * @address: address to remap 77 * 78 * The returned physical address is the physical (CPU) mapping for 79 * the memory address given. It is only valid to use this function on 80 * addresses directly mapped or allocated via kmalloc. 81 * 82 * This function does not give bus mappings for DMA transfers. In 83 * almost all conceivable cases a device driver should not be using 84 * this function 85 */ 86 static inline unsigned long virt_to_phys(volatile const void *address) 87 { 88 unsigned long addr = (unsigned long)address; 89 90 /* this corresponds to kernel implementation of __pa() */ 91 #ifdef CONFIG_64BIT 92 if (addr < CKSEG0) 93 return XPHYSADDR(addr); 94 #endif 95 return CPHYSADDR(addr); 96 } 97 #define virt_to_phys virt_to_phys 98 99 /* 100 * phys_to_virt - map physical address to virtual 101 * @address: address to remap 102 * 103 * The returned virtual address is a current CPU mapping for 104 * the memory address given. It is only valid to use this function on 105 * addresses that have a kernel mapping 106 * 107 * This function does not handle bus mappings for DMA transfers. In 108 * almost all conceivable cases a device driver should not be using 109 * this function 110 */ 111 static inline void *phys_to_virt(unsigned long address) 112 { 113 return (void *)(address + PAGE_OFFSET - PHYS_OFFSET); 114 } 115 #define phys_to_virt phys_to_virt 116 117 /* 118 * ISA I/O bus memory addresses are 1:1 with the physical address. 119 */ 120 static inline unsigned long isa_virt_to_bus(volatile void *address) 121 { 122 return (unsigned long)address - PAGE_OFFSET; 123 } 124 125 static inline void *isa_bus_to_virt(unsigned long address) 126 { 127 return (void *)(address + PAGE_OFFSET); 128 } 129 130 #define isa_page_to_bus page_to_phys 131 132 /* 133 * However PCI ones are not necessarily 1:1 and therefore these interfaces 134 * are forbidden in portable PCI drivers. 135 * 136 * Allow them for x86 for legacy drivers, though. 137 */ 138 #define virt_to_bus virt_to_phys 139 #define bus_to_virt phys_to_virt 140 141 static inline void __iomem *__ioremap_mode(phys_addr_t offset, unsigned long size, 142 unsigned long flags) 143 { 144 void __iomem *addr; 145 phys_addr_t phys_addr; 146 147 addr = plat_ioremap(offset, size, flags); 148 if (addr) 149 return addr; 150 151 phys_addr = fixup_bigphys_addr(offset, size); 152 return (void __iomem *)(unsigned long)CKSEG1ADDR(phys_addr); 153 } 154 155 /* 156 * ioremap - map bus memory into CPU space 157 * @offset: bus address of the memory 158 * @size: size of the resource to map 159 * 160 * ioremap performs a platform specific sequence of operations to 161 * make bus memory CPU accessible via the readb/readw/readl/writeb/ 162 * writew/writel functions and the other mmio helpers. The returned 163 * address is not guaranteed to be usable directly as a virtual 164 * address. 165 */ 166 #define ioremap(offset, size) \ 167 __ioremap_mode((offset), (size), _CACHE_UNCACHED) 168 169 /* 170 * ioremap_nocache - map bus memory into CPU space 171 * @offset: bus address of the memory 172 * @size: size of the resource to map 173 * 174 * ioremap_nocache performs a platform specific sequence of operations to 175 * make bus memory CPU accessible via the readb/readw/readl/writeb/ 176 * writew/writel functions and the other mmio helpers. The returned 177 * address is not guaranteed to be usable directly as a virtual 178 * address. 179 * 180 * This version of ioremap ensures that the memory is marked uncachable 181 * on the CPU as well as honouring existing caching rules from things like 182 * the PCI bus. Note that there are other caches and buffers on many 183 * busses. In particular driver authors should read up on PCI writes 184 * 185 * It's useful if some control registers are in such an area and 186 * write combining or read caching is not desirable: 187 */ 188 #define ioremap_nocache(offset, size) \ 189 __ioremap_mode((offset), (size), _CACHE_UNCACHED) 190 #define ioremap_uc ioremap_nocache 191 192 /* 193 * ioremap_cachable - map bus memory into CPU space 194 * @offset: bus address of the memory 195 * @size: size of the resource to map 196 * 197 * ioremap_nocache performs a platform specific sequence of operations to 198 * make bus memory CPU accessible via the readb/readw/readl/writeb/ 199 * writew/writel functions and the other mmio helpers. The returned 200 * address is not guaranteed to be usable directly as a virtual 201 * address. 202 * 203 * This version of ioremap ensures that the memory is marked cachable by 204 * the CPU. Also enables full write-combining. Useful for some 205 * memory-like regions on I/O busses. 206 */ 207 #define ioremap_cachable(offset, size) \ 208 __ioremap_mode((offset), (size), _page_cachable_default) 209 210 /* 211 * These two are MIPS specific ioremap variant. ioremap_cacheable_cow 212 * requests a cachable mapping, ioremap_uncached_accelerated requests a 213 * mapping using the uncached accelerated mode which isn't supported on 214 * all processors. 215 */ 216 #define ioremap_cacheable_cow(offset, size) \ 217 __ioremap_mode((offset), (size), _CACHE_CACHABLE_COW) 218 #define ioremap_uncached_accelerated(offset, size) \ 219 __ioremap_mode((offset), (size), _CACHE_UNCACHED_ACCELERATED) 220 221 static inline void iounmap(const volatile void __iomem *addr) 222 { 223 plat_iounmap(addr); 224 } 225 226 #ifdef CONFIG_CPU_CAVIUM_OCTEON 227 #define war_octeon_io_reorder_wmb() wmb() 228 #else 229 #define war_octeon_io_reorder_wmb() do { } while (0) 230 #endif 231 232 #define __BUILD_MEMORY_SINGLE(pfx, bwlq, type, irq) \ 233 \ 234 static inline void pfx##write##bwlq(type val, \ 235 volatile void __iomem *mem) \ 236 { \ 237 volatile type *__mem; \ 238 type __val; \ 239 \ 240 war_octeon_io_reorder_wmb(); \ 241 \ 242 __mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem)); \ 243 \ 244 __val = pfx##ioswab##bwlq(__mem, val); \ 245 \ 246 if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long)) \ 247 *__mem = __val; \ 248 else if (cpu_has_64bits) { \ 249 type __tmp; \ 250 \ 251 __asm__ __volatile__( \ 252 ".set arch=r4000" "\t\t# __writeq""\n\t" \ 253 "dsll32 %L0, %L0, 0" "\n\t" \ 254 "dsrl32 %L0, %L0, 0" "\n\t" \ 255 "dsll32 %M0, %M0, 0" "\n\t" \ 256 "or %L0, %L0, %M0" "\n\t" \ 257 "sd %L0, %2" "\n\t" \ 258 ".set mips0" "\n" \ 259 : "=r" (__tmp) \ 260 : "0" (__val), "m" (*__mem)); \ 261 } else \ 262 BUG(); \ 263 } \ 264 \ 265 static inline type pfx##read##bwlq(const volatile void __iomem *mem) \ 266 { \ 267 volatile type *__mem; \ 268 type __val; \ 269 \ 270 __mem = (void *)__swizzle_addr_##bwlq((unsigned long)(mem)); \ 271 \ 272 if (sizeof(type) != sizeof(u64) || sizeof(u64) == sizeof(long)) \ 273 __val = *__mem; \ 274 else if (cpu_has_64bits) { \ 275 __asm__ __volatile__( \ 276 ".set arch=r4000" "\t\t# __readq" "\n\t" \ 277 "ld %L0, %1" "\n\t" \ 278 "dsra32 %M0, %L0, 0" "\n\t" \ 279 "sll %L0, %L0, 0" "\n\t" \ 280 ".set mips0" "\n" \ 281 : "=r" (__val) \ 282 : "m" (*__mem)); \ 283 } else { \ 284 __val = 0; \ 285 BUG(); \ 286 } \ 287 \ 288 return pfx##ioswab##bwlq(__mem, __val); \ 289 } 290 291 #define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, p) \ 292 \ 293 static inline void pfx##out##bwlq##p(type val, unsigned long port) \ 294 { \ 295 volatile type *__addr; \ 296 type __val; \ 297 \ 298 war_octeon_io_reorder_wmb(); \ 299 \ 300 __addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base() + port); \ 301 \ 302 __val = pfx##ioswab##bwlq(__addr, val); \ 303 \ 304 /* Really, we want this to be atomic */ \ 305 BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long)); \ 306 \ 307 *__addr = __val; \ 308 } \ 309 \ 310 static inline type pfx##in##bwlq##p(unsigned long port) \ 311 { \ 312 volatile type *__addr; \ 313 type __val; \ 314 \ 315 __addr = (void *)__swizzle_addr_##bwlq(mips_io_port_base() + port); \ 316 \ 317 BUILD_BUG_ON(sizeof(type) > sizeof(unsigned long)); \ 318 \ 319 __val = *__addr; \ 320 \ 321 return pfx##ioswab##bwlq(__addr, __val); \ 322 } 323 324 #define __BUILD_MEMORY_PFX(bus, bwlq, type) \ 325 \ 326 __BUILD_MEMORY_SINGLE(bus, bwlq, type, 1) 327 328 #define BUILDIO_MEM(bwlq, type) \ 329 \ 330 __BUILD_MEMORY_PFX(__raw_, bwlq, type) \ 331 __BUILD_MEMORY_PFX(, bwlq, type) \ 332 __BUILD_MEMORY_PFX(__mem_, bwlq, type) \ 333 334 BUILDIO_MEM(b, u8) 335 BUILDIO_MEM(w, u16) 336 BUILDIO_MEM(l, u32) 337 BUILDIO_MEM(q, u64) 338 339 #define __BUILD_IOPORT_PFX(bus, bwlq, type) \ 340 __BUILD_IOPORT_SINGLE(bus, bwlq, type, ) \ 341 __BUILD_IOPORT_SINGLE(bus, bwlq, type, _p) 342 343 #define BUILDIO_IOPORT(bwlq, type) \ 344 __BUILD_IOPORT_PFX(, bwlq, type) \ 345 __BUILD_IOPORT_PFX(__mem_, bwlq, type) 346 347 BUILDIO_IOPORT(b, u8) 348 BUILDIO_IOPORT(w, u16) 349 BUILDIO_IOPORT(l, u32) 350 #ifdef CONFIG_64BIT 351 BUILDIO_IOPORT(q, u64) 352 #endif 353 354 #define __BUILDIO(bwlq, type) \ 355 \ 356 __BUILD_MEMORY_SINGLE(____raw_, bwlq, type, 0) 357 358 __BUILDIO(q, u64) 359 360 #define readb_relaxed readb 361 #define readw_relaxed readw 362 #define readl_relaxed readl 363 #define readq_relaxed readq 364 365 #define writeb_relaxed writeb 366 #define writew_relaxed writew 367 #define writel_relaxed writel 368 #define writeq_relaxed writeq 369 370 #define readb_be(addr) \ 371 __raw_readb((__force unsigned *)(addr)) 372 #define readw_be(addr) \ 373 be16_to_cpu(__raw_readw((__force unsigned *)(addr))) 374 #define readl_be(addr) \ 375 be32_to_cpu(__raw_readl((__force unsigned *)(addr))) 376 #define readq_be(addr) \ 377 be64_to_cpu(__raw_readq((__force unsigned *)(addr))) 378 379 #define writeb_be(val, addr) \ 380 __raw_writeb((val), (__force unsigned *)(addr)) 381 #define writew_be(val, addr) \ 382 __raw_writew(cpu_to_be16((val)), (__force unsigned *)(addr)) 383 #define writel_be(val, addr) \ 384 __raw_writel(cpu_to_be32((val)), (__force unsigned *)(addr)) 385 #define writeq_be(val, addr) \ 386 __raw_writeq(cpu_to_be64((val)), (__force unsigned *)(addr)) 387 388 /* 389 * Some code tests for these symbols 390 */ 391 #define readq readq 392 #define writeq writeq 393 394 #define __BUILD_MEMORY_STRING(bwlq, type) \ 395 \ 396 static inline void writes##bwlq(volatile void __iomem *mem, \ 397 const void *addr, unsigned int count) \ 398 { \ 399 const volatile type *__addr = addr; \ 400 \ 401 while (count--) { \ 402 __mem_write##bwlq(*__addr, mem); \ 403 __addr++; \ 404 } \ 405 } \ 406 \ 407 static inline void reads##bwlq(volatile void __iomem *mem, void *addr, \ 408 unsigned int count) \ 409 { \ 410 volatile type *__addr = addr; \ 411 \ 412 while (count--) { \ 413 *__addr = __mem_read##bwlq(mem); \ 414 __addr++; \ 415 } \ 416 } 417 418 #define __BUILD_IOPORT_STRING(bwlq, type) \ 419 \ 420 static inline void outs##bwlq(unsigned long port, const void *addr, \ 421 unsigned int count) \ 422 { \ 423 const volatile type *__addr = addr; \ 424 \ 425 while (count--) { \ 426 __mem_out##bwlq(*__addr, port); \ 427 __addr++; \ 428 } \ 429 } \ 430 \ 431 static inline void ins##bwlq(unsigned long port, void *addr, \ 432 unsigned int count) \ 433 { \ 434 volatile type *__addr = addr; \ 435 \ 436 while (count--) { \ 437 *__addr = __mem_in##bwlq(port); \ 438 __addr++; \ 439 } \ 440 } 441 442 #define BUILDSTRING(bwlq, type) \ 443 \ 444 __BUILD_MEMORY_STRING(bwlq, type) \ 445 __BUILD_IOPORT_STRING(bwlq, type) 446 447 BUILDSTRING(b, u8) 448 BUILDSTRING(w, u16) 449 BUILDSTRING(l, u32) 450 #ifdef CONFIG_64BIT 451 BUILDSTRING(q, u64) 452 #endif 453 454 455 #ifdef CONFIG_CPU_CAVIUM_OCTEON 456 #define mmiowb() wmb() 457 #else 458 /* Depends on MIPS II instruction set */ 459 #define mmiowb() asm volatile ("sync" ::: "memory") 460 #endif 461 462 static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count) 463 { 464 memset((void __force *)addr, val, count); 465 } 466 static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count) 467 { 468 memcpy(dst, (void __force *)src, count); 469 } 470 static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count) 471 { 472 memcpy((void __force *)dst, src, count); 473 } 474 475 /* 476 * Read a 32-bit register that requires a 64-bit read cycle on the bus. 477 * Avoid interrupt mucking, just adjust the address for 4-byte access. 478 * Assume the addresses are 8-byte aligned. 479 */ 480 #ifdef __MIPSEB__ 481 #define __CSR_32_ADJUST 4 482 #else 483 #define __CSR_32_ADJUST 0 484 #endif 485 486 #define csr_out32(v, a) (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST) = (v)) 487 #define csr_in32(a) (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST)) 488 489 /* 490 * U-Boot specific 491 */ 492 #define sync() mmiowb() 493 494 #define MAP_NOCACHE 1 495 496 static inline void * 497 map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags) 498 { 499 if (flags == MAP_NOCACHE) 500 return ioremap(paddr, len); 501 502 return (void *)CKSEG0ADDR(paddr); 503 } 504 #define map_physmem map_physmem 505 506 #define __BUILD_CLRBITS(bwlq, sfx, end, type) \ 507 \ 508 static inline void clrbits_##sfx(volatile void __iomem *mem, type clr) \ 509 { \ 510 type __val = __raw_read##bwlq(mem); \ 511 __val = end##_to_cpu(__val); \ 512 __val &= ~clr; \ 513 __val = cpu_to_##end(__val); \ 514 __raw_write##bwlq(__val, mem); \ 515 } 516 517 #define __BUILD_SETBITS(bwlq, sfx, end, type) \ 518 \ 519 static inline void setbits_##sfx(volatile void __iomem *mem, type set) \ 520 { \ 521 type __val = __raw_read##bwlq(mem); \ 522 __val = end##_to_cpu(__val); \ 523 __val |= set; \ 524 __val = cpu_to_##end(__val); \ 525 __raw_write##bwlq(__val, mem); \ 526 } 527 528 #define __BUILD_CLRSETBITS(bwlq, sfx, end, type) \ 529 \ 530 static inline void clrsetbits_##sfx(volatile void __iomem *mem, \ 531 type clr, type set) \ 532 { \ 533 type __val = __raw_read##bwlq(mem); \ 534 __val = end##_to_cpu(__val); \ 535 __val &= ~clr; \ 536 __val |= set; \ 537 __val = cpu_to_##end(__val); \ 538 __raw_write##bwlq(__val, mem); \ 539 } 540 541 #define BUILD_CLRSETBITS(bwlq, sfx, end, type) \ 542 \ 543 __BUILD_CLRBITS(bwlq, sfx, end, type) \ 544 __BUILD_SETBITS(bwlq, sfx, end, type) \ 545 __BUILD_CLRSETBITS(bwlq, sfx, end, type) 546 547 #define __to_cpu(v) (v) 548 #define cpu_to__(v) (v) 549 550 BUILD_CLRSETBITS(b, 8, _, u8) 551 BUILD_CLRSETBITS(w, le16, le16, u16) 552 BUILD_CLRSETBITS(w, be16, be16, u16) 553 BUILD_CLRSETBITS(w, 16, _, u16) 554 BUILD_CLRSETBITS(l, le32, le32, u32) 555 BUILD_CLRSETBITS(l, be32, be32, u32) 556 BUILD_CLRSETBITS(l, 32, _, u32) 557 BUILD_CLRSETBITS(q, le64, le64, u64) 558 BUILD_CLRSETBITS(q, be64, be64, u64) 559 BUILD_CLRSETBITS(q, 64, _, u64) 560 561 #include <asm-generic/io.h> 562 563 #endif /* _ASM_IO_H */ 564