io.h (7527B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _ASM_IA64_IO_H 3#define _ASM_IA64_IO_H 4 5/* 6 * This file contains the definitions for the emulated IO instructions 7 * inb/inw/inl/outb/outw/outl and the "string versions" of the same 8 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing" 9 * versions of the single-IO instructions (inb_p/inw_p/..). 10 * 11 * This file is not meant to be obfuscating: it's just complicated to 12 * (a) handle it all in a way that makes gcc able to optimize it as 13 * well as possible and (b) trying to avoid writing the same thing 14 * over and over again with slight variations and possibly making a 15 * mistake somewhere. 16 * 17 * Copyright (C) 1998-2003 Hewlett-Packard Co 18 * David Mosberger-Tang <davidm@hpl.hp.com> 19 * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com> 20 * Copyright (C) 1999 Don Dugger <don.dugger@intel.com> 21 */ 22 23#include <asm/unaligned.h> 24#include <asm/early_ioremap.h> 25 26/* We don't use IO slowdowns on the ia64, but.. */ 27#define __SLOW_DOWN_IO do { } while (0) 28#define SLOW_DOWN_IO do { } while (0) 29 30#define __IA64_UNCACHED_OFFSET RGN_BASE(RGN_UNCACHED) 31 32/* 33 * The legacy I/O space defined by the ia64 architecture supports only 65536 ports, but 34 * large machines may have multiple other I/O spaces so we can't place any a priori limit 35 * on IO_SPACE_LIMIT. These additional spaces are described in ACPI. 36 */ 37#define IO_SPACE_LIMIT 0xffffffffffffffffUL 38 39#define MAX_IO_SPACES_BITS 8 40#define MAX_IO_SPACES (1UL << MAX_IO_SPACES_BITS) 41#define IO_SPACE_BITS 24 42#define IO_SPACE_SIZE (1UL << IO_SPACE_BITS) 43 44#define IO_SPACE_NR(port) ((port) >> IO_SPACE_BITS) 45#define IO_SPACE_BASE(space) ((space) << IO_SPACE_BITS) 46#define IO_SPACE_PORT(port) ((port) & (IO_SPACE_SIZE - 1)) 47 48#define IO_SPACE_SPARSE_ENCODING(p) ((((p) >> 2) << 12) | ((p) & 0xfff)) 49 50struct io_space { 51 unsigned long mmio_base; /* base in MMIO space */ 52 int sparse; 53}; 54 55extern struct io_space io_space[]; 56extern unsigned int num_io_spaces; 57 58# ifdef __KERNEL__ 59 60/* 61 * All MMIO iomem cookies are in region 6; anything less is a PIO cookie: 62 * 0xCxxxxxxxxxxxxxxx MMIO cookie (return from ioremap) 63 * 0x000000001SPPPPPP PIO cookie (S=space number, P..P=port) 64 * 65 * ioread/writeX() uses the leading 1 in PIO cookies (PIO_OFFSET) to catch 66 * code that uses bare port numbers without the prerequisite pci_iomap(). 67 */ 68#define PIO_OFFSET (1UL << (MAX_IO_SPACES_BITS + IO_SPACE_BITS)) 69#define PIO_MASK (PIO_OFFSET - 1) 70#define PIO_RESERVED __IA64_UNCACHED_OFFSET 71#define HAVE_ARCH_PIO_SIZE 72 73#include <asm/intrinsics.h> 74#include <asm/page.h> 75#include <asm-generic/iomap.h> 76 77/* 78 * Change virtual addresses to physical addresses and vv. 79 */ 80static inline unsigned long 81virt_to_phys (volatile void *address) 82{ 83 return (unsigned long) address - PAGE_OFFSET; 84} 85#define virt_to_phys virt_to_phys 86 87static inline void* 88phys_to_virt (unsigned long address) 89{ 90 return (void *) (address + PAGE_OFFSET); 91} 92#define phys_to_virt phys_to_virt 93 94#define ARCH_HAS_VALID_PHYS_ADDR_RANGE 95extern u64 kern_mem_attribute (unsigned long phys_addr, unsigned long size); 96extern int valid_phys_addr_range (phys_addr_t addr, size_t count); /* efi.c */ 97extern int valid_mmap_phys_addr_range (unsigned long pfn, size_t count); 98 99/* 100 * The following two macros are deprecated and scheduled for removal. 101 * Please use the PCI-DMA interface defined in <asm/pci.h> instead. 102 */ 103#define bus_to_virt phys_to_virt 104#define virt_to_bus virt_to_phys 105#define page_to_bus page_to_phys 106 107# endif /* KERNEL */ 108 109/* 110 * Memory fence w/accept. This should never be used in code that is 111 * not IA-64 specific. 112 */ 113#define __ia64_mf_a() ia64_mfa() 114 115static inline void* 116__ia64_mk_io_addr (unsigned long port) 117{ 118 struct io_space *space; 119 unsigned long offset; 120 121 space = &io_space[IO_SPACE_NR(port)]; 122 port = IO_SPACE_PORT(port); 123 if (space->sparse) 124 offset = IO_SPACE_SPARSE_ENCODING(port); 125 else 126 offset = port; 127 128 return (void *) (space->mmio_base | offset); 129} 130 131/* 132 * For the in/out routines, we need to do "mf.a" _after_ doing the I/O access to ensure 133 * that the access has completed before executing other I/O accesses. Since we're doing 134 * the accesses through an uncachable (UC) translation, the CPU will execute them in 135 * program order. However, we still need to tell the compiler not to shuffle them around 136 * during optimization, which is why we use "volatile" pointers. 137 */ 138 139#define inb inb 140static inline unsigned int inb(unsigned long port) 141{ 142 volatile unsigned char *addr = __ia64_mk_io_addr(port); 143 unsigned char ret; 144 145 ret = *addr; 146 __ia64_mf_a(); 147 return ret; 148} 149 150#define inw inw 151static inline unsigned int inw(unsigned long port) 152{ 153 volatile unsigned short *addr = __ia64_mk_io_addr(port); 154 unsigned short ret; 155 156 ret = *addr; 157 __ia64_mf_a(); 158 return ret; 159} 160 161#define inl inl 162static inline unsigned int inl(unsigned long port) 163{ 164 volatile unsigned int *addr = __ia64_mk_io_addr(port); 165 unsigned int ret; 166 167 ret = *addr; 168 __ia64_mf_a(); 169 return ret; 170} 171 172#define outb outb 173static inline void outb(unsigned char val, unsigned long port) 174{ 175 volatile unsigned char *addr = __ia64_mk_io_addr(port); 176 177 *addr = val; 178 __ia64_mf_a(); 179} 180 181#define outw outw 182static inline void outw(unsigned short val, unsigned long port) 183{ 184 volatile unsigned short *addr = __ia64_mk_io_addr(port); 185 186 *addr = val; 187 __ia64_mf_a(); 188} 189 190#define outl outl 191static inline void outl(unsigned int val, unsigned long port) 192{ 193 volatile unsigned int *addr = __ia64_mk_io_addr(port); 194 195 *addr = val; 196 __ia64_mf_a(); 197} 198 199#define insb insb 200static inline void insb(unsigned long port, void *dst, unsigned long count) 201{ 202 unsigned char *dp = dst; 203 204 while (count--) 205 *dp++ = inb(port); 206} 207 208#define insw insw 209static inline void insw(unsigned long port, void *dst, unsigned long count) 210{ 211 unsigned short *dp = dst; 212 213 while (count--) 214 put_unaligned(inw(port), dp++); 215} 216 217#define insl insl 218static inline void insl(unsigned long port, void *dst, unsigned long count) 219{ 220 unsigned int *dp = dst; 221 222 while (count--) 223 put_unaligned(inl(port), dp++); 224} 225 226#define outsb outsb 227static inline void outsb(unsigned long port, const void *src, 228 unsigned long count) 229{ 230 const unsigned char *sp = src; 231 232 while (count--) 233 outb(*sp++, port); 234} 235 236#define outsw outsw 237static inline void outsw(unsigned long port, const void *src, 238 unsigned long count) 239{ 240 const unsigned short *sp = src; 241 242 while (count--) 243 outw(get_unaligned(sp++), port); 244} 245 246#define outsl outsl 247static inline void outsl(unsigned long port, const void *src, 248 unsigned long count) 249{ 250 const unsigned int *sp = src; 251 252 while (count--) 253 outl(get_unaligned(sp++), port); 254} 255 256# ifdef __KERNEL__ 257 258extern void __iomem * ioremap(unsigned long offset, unsigned long size); 259extern void __iomem * ioremap_uc(unsigned long offset, unsigned long size); 260extern void iounmap (volatile void __iomem *addr); 261static inline void __iomem * ioremap_cache (unsigned long phys_addr, unsigned long size) 262{ 263 return ioremap(phys_addr, size); 264} 265#define ioremap ioremap 266#define ioremap_cache ioremap_cache 267#define ioremap_uc ioremap_uc 268#define iounmap iounmap 269 270/* 271 * String version of IO memory access ops: 272 */ 273extern void memcpy_fromio(void *dst, const volatile void __iomem *src, long n); 274extern void memcpy_toio(volatile void __iomem *dst, const void *src, long n); 275extern void memset_io(volatile void __iomem *s, int c, long n); 276 277#define memcpy_fromio memcpy_fromio 278#define memcpy_toio memcpy_toio 279#define memset_io memset_io 280#define xlate_dev_mem_ptr xlate_dev_mem_ptr 281#include <asm-generic/io.h> 282#undef PCI_IOBASE 283 284# endif /* __KERNEL__ */ 285 286#endif /* _ASM_IA64_IO_H */