arch/ia64/include/asm/io.h

   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
  50 struct io_space {
  51         unsigned long mmio_base;        /* base in MMIO space */
  52         int sparse;
  53 };
  54
  55 extern struct io_space io_space[];
  56 extern 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  */
  80 static inline unsigned long
  81 virt_to_phys (volatile void *address)
  82 {
  83         return (unsigned long) address - PAGE_OFFSET;
  84 }
  85 #define virt_to_phys virt_to_phys
  86
  87 static inline void*
  88 phys_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
  95 extern u64 kern_mem_attribute (unsigned long phys_addr, unsigned long size);
  96 extern int valid_phys_addr_range (phys_addr_t addr, size_t count); /* efi.c */
  97 extern 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
 115 static 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
 140 static 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
 151 static 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
 162 static 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
 173 static 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
 182 static 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
 191 static 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
 200 static 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
 209 static 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
 218 static 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
 227 static 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
 237 static 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
 247 static 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
 258 extern void __iomem * ioremap(unsigned long offset, unsigned long size);
 259 extern void __iomem * ioremap_uc(unsigned long offset, unsigned long size);
 260 extern void iounmap (volatile void __iomem *addr);
 261 static 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  */
 273 extern void memcpy_fromio(void *dst, const volatile void __iomem *src, long n);
 274 extern void memcpy_toio(volatile void __iomem *dst, const void *src, long n);
 275 extern 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_kmem_ptr xlate_dev_kmem_ptr
 281 #define xlate_dev_mem_ptr xlate_dev_mem_ptr
 282 #include <asm-generic/io.h>
 283 #undef PCI_IOBASE
 284
 285 # endif /* __KERNEL__ */
 286
 287 #endif /* _ASM_IA64_IO_H */